Bipolar battery. RU patent 2521075.

FIELD: electricity.

SUBSTANCE: bipolar battery consists of electric-energy generating component that is formed by means of stacking a variety of bipolar electrodes in which the electrode layer is formed at the front and rear sides of the current tap through the layer of electrolyte; a resilient metal part contacting the electric-energy generating component so that it contacts the electric-energy generating component in point or linear contact when external force is applied to it and so that it contacts the electric-energy generating component in surface contact when external force is applied to it; and external cover material envisaged for embedding of the electric-energy generating component in it and the resilient metal part, which inner pressure is set less than atmospheric pressure so that the resilient metal part is forced to contact the electric-energy generating component in surface contact due to pressure difference between inner pressure and atmospheric pressure.

EFFECT: limitation of current value at gas release.

8 cl, 9 dwg

The technical field

[0001] This invention relates to a bipolar battery.

The level of technology

[0002] JP-2004-319156-A reveals bipolar battery, formed by stacking stack of many bipolar electrodes, in which the electrode layers formed on the front and back surfaces of shunts, through a layer of electrolyte.

Summary of the invention

[0003] However, in this type of bipolar battery temperature electricity-generating element may over increase when an causes of deviations from normal operation, such as an external short circuit. Temperature increase electricity-generating element electrolyte (the electrolyte solution) can gazifitsiruet that will increase the internal pressure of the outer coating material.

[0004] the invention focused on this traditional problem and objective of this invention is to provide a bipolar batteries, in which the flow is too large current prevented by limiting the amount of current in the allocation gas such that the internal pressure of the outer coating material increases.

[0005] In accordance with one aspect of the present invention bipolar battery includes electricity-generating element formed by stacking stack of many bipolar electrodes, in which the electrode layer formed on the front and back sides of shunts, through a layer of electrolyte. Bipolar battery also includes: elastic metal part, as provided in the contact with the power generating element so that it was in contact with electricity-generating element in point or linear contact, when it is not attached external force, and was in contact with electricity-generating element in surface contact, when attached external force; and the outer cover material, provided for accepting and understanding electricity-generating element elastic and metallic parts, the internal pressure of which is set lower than atmospheric pressure, so elastic metal part is compelled to contact with electricity-generating element in the surface contact due to the pressure difference between the internal pressure and atmospheric pressure.

[0006] implementation Options and advantages of the present invention will be described in detail below along with the attached the drawings.

Brief description of drawings

[0007] FIG. 1 is a type representing the first implementation bipolar battery on this invention.

FIG. 2 is a form of illustrating actions and the effects of the first variant of implementation.

FIG. 3 is a type representing the second implementation bipolar battery on this invention.

FIG. 4 is the view of illustrating actions and effects of the second variant of implementation.

FIG. 5 is a type representing an elastic metal part of the electrode output in the third variant of realization of bipolar battery on this invention.

FIG. 6 is a type representing an elastic metal part of the electrode output in the fourth variant of realization of bipolar battery on this invention.

FIG. 7 is a type representing the fifth variant of implementation bipolar battery on this invention.

Fig. 8 is a type representing an elastic metal part of electrode output in another variant of realization of bipolar battery on this invention.

FIG. 9 is a type representing an elastic metal part of the electrode output in yet another variant of realization of bipolar battery on this invention.

Description of options implementation

The first implementation

[0008] FIG. 1 is a type representing the first implementation bipolar battery on this invention, and FIG. 1(A) is a form of longitudinal-section showing the assembled state, FIG. 1(C) is a species in the long term elastic metal parts electrode output state when it is not attached external power, and FIG. 1(a) is the form in the section-in FIG. 1(B).

[0009] Bipolar battery 1 includes electricity-generating element 10, electrode conclusion 20 and the outer cover material 30.

[0010] Generating electricity item 10 includes bipolar electrode 11, layer 12 electrolyte and condensation 13.

[0011] Bipolar electrode 11 includes electrodes 111, positive electrode 112 and the negative electrode 113. The positive electrode 112 formed on the same surface (bottom surface in FIG. 1(A)) of shunts 111. The negative electrode 113 formed on the opposite surface (upper surface in FIG. 1(A)) of shunts 111.

[0012] Electrodes 111 formed from conductive material, such as metal, conductive polymer material or non-conductive polymer material containing added conductive filler. Examples of metals that can be profitably used as material of shunts 111, include aluminum, Nickel, iron, stainless steel, titanium and copper. Also can be used plating material of Nickel and aluminium plating material, of copper and aluminium and coating material, formed from a combination of these metals, and the like. Alternatively can be used foil, formed by covering the metal surface of the aluminum. From the point of view of the electron conductivity and capacity of the battery is especially preferred aluminum, stainless steel and copper.

[0013] in Addition, examples of conductive polymer materials, which can be profitably used as material of shunts 111 include polianilin, polypyrrol, Politiken, polyacetylene, polyparaphenylene, polyphenilenevinylene, pan and polyoxadiazole. These conductive polymer materials have sufficient conductivity without having to add conductive filler, and so predominant in terms of simplification of the production process and reduce the weight of shunts 111. It should be noted, however, that, if required, a conductive filler can be added.

[0014] in Addition, examples containing added conductive filler non-conductive polymer materials that can preferably be used as material of shunts 111, include polyethylene (PE; high-density polyethylene (HDPE) or polyethylene low density (LDPE)), polypropylene (PP), polyethylene terephthalate (PET), polimermetal (PAN), polyimide (PI), polyamide-imide (PAI), polyamide (PA), polytetrafluoroethylene (PTFE), styrene-butadiene rubber (SBC), polyacrylonitrile (PAN), polymethylacrylate (PSE), polymethylmethacrylate (PMMA), polyvinyl chloride (PVC), polyvinylidenefluoride (PVDF) and polystyrene (PS). With these non-conductive polymer materials can be obtained excellent resistance potential and solvent resistance.

[0015] No specific restrictions on conductive filler, provided that he is a conductive material. However, metal, or similar conductive carbon etc. demonstrate excellent conductivity and resistance to potential and excellent property blocking of lithium ions. Examples of metals or the like, which may be profitably used as material conductive filler, include at least one metal, selected from the group comprising Ni, Ti, Al, Cu, Pt, Fe, Cr, Sn, Zn, In, Sb and K, alloy containing these metals, and metal oxide containing these metals. Best type of conductive carbon used as a material conductive filler, preferably includes at least one type is selected from the group comprising acetylene carbon black, soot "Vulcan", soot "Black Pearl", carbon nanovolokna, soot "Ketjen Black, carbon nanotubes, carbon rooroobear nanofactory (carbon namoroka), carbon nanosilica and fullerene. There are no restrictions on the amount of added conductive filler provided that the current leads 111 can be given sufficient conductivity, however, is usually added a number between approximately 5% and 35% by weight.

[0016] Size of shunts 111 shall be determined in accordance with the scope of application (appointment) of the battery. For example, the electrodes of the 111 having a large surface area, are used in large batteries that require high energy density. There are no restrictions on the thickness of shunts 111. The thickness of shunts 111 usually set between approximately 1 to 100 microns.

[0017] As described above, the positive electrode 112 formed on the same surface (bottom surface in FIG. 1(A)) of shunts 111. The positive electrode 112 is a layer that includes the active material of the positive electrode. Active material positive electrode is a compound that absorbs ions during discharge and releases ions during charging. Preferred example of active material positive electrode is a complex oxide lithium-transition metal oxide which is the connection of the transition metal and lithium. More specifically, complex oxide lithium-transition metal is formed by the partial substitution of complex oxide-based Li/Co, such as LiCoO 2 , complex oxide-based Li/Ni, such as LiNiO 2 , complex oxide-based Li-Mn, such as spinel LiMn 2 O 4 , or complex oxide-based Li/Fe, such as LiFeO 2 , and its transition metal another element and such. Complex oxide lithium-transition metal demonstrate excellent responsiveness and excellent cyclical characteristics and the cost of its production is small. As an alternative can be used phosphate connection or sulphate connection of the transition metal and lithium, such as LiFePO 4 ; the oxide and sulphide transition metal, such as V 2 O 5 , MnO 2 , TiS 2 , MoS MoO 2 or 3 ; PbO 2 ; AgO; NiOOH; and the like. Active material positive electrode can be used separately or in mixture of two or more types. There are no restrictions on the average particle size of the active material positive electrode, but on the basis of considerations to increase capacity and improve responsiveness and cyclical characteristics of the active material of the positive electrode, the average particle size is preferably between 1 and 100 microns, and more preferably between 1 and 20 microns. In this interval, the increase in internal resistance of the secondary (rechargeable) battery during charging and discharging under conditions of high power output can be suppressed, and can be discharged enough current. It should be noted that when the active material of the positive electrode is formed from secondary particles, the average size of particles in the components of the secondary particles primary particles preferably set in the range from 10 nm to 1 micron, but not necessarily limited to this range. Depending on the production method, however, can be the formation of the active material of the positive electrode of secondary particles by coagulation, aggregation, etc. Active material positive electrode can take different forms, such as the spherical form (the form of a powder), lamellar form, needle shape, bar form, angular shape, etc. depending on the type, method of production, etc. However, active positive electrode material is not limited to these forms, and any form can be used without problems. The optimal form, which can be improved battery features, such as a characteristic of charging/discharging, preferably chosen accordingly.

[0018] Layer of active material may include other substances as required. For example, in its composition can be included electrolyte, salt lithium increasing conductivity additive, etc. to achieve the increase of ionic conductivity.

[0019] Electrolyte may be solid polymer electrolyte gel polymer electrolyte the electrolyte, educated laying on each other solid polymer electrolyte and gel polymer electrolyte, etc. In other words, the positive electrode can be formed a multi-layered structure, so that the types of electrolyte and the types and sizes of particles of active materials that make up the positive electrode, as their ratios vary between layers formed on the side of shunts and on the side of the electrolyte. Ratio (mass ratio) between the polymer and the electrolyte solution, components of the gel polymer electrolyte, preferably set between 20:80 and 98:2, i.e. within that interval, where the share of electrolyte solution is relatively small.

[0020] gel polymer electrolyte the electrolyte solution used in a typical lithium-ion battery, contained in the solid polymer electrolyte with ionic conductivity. Can also be used electrolyte, which is similar to the electrolyte solution is charged polymer frame, not having conductivity of lithium ions.

[0025] Mix the number of active material positive electrode, electrolyte (preferably solid polymer electrolyte), salts of lithium and increase the conductivity of the additive in the positive electrode should be determined taking account of the alleged use (whether to focus on power output, energy or something else) and ionic conductivity of the battery. For example, when mixed amount of electrolyte, in particular solid polymer electrolyte in the positive electrode too little resistance ionic conductivity and resistance to diffusion of ions in the layer of active material increase, leading to degraded performance of the battery. On the other hand, when mixed amount of electrolyte, in particular solid polymer electrolyte in the positive electrode is too large, the energy density of a battery is reduced. Therefore, the amount of solid polymer electrolyte that is suitable for the purpose, is determined taking into account these factors.

[0026] No specific restrictions on the thickness of the positive electrode and, as described above, in connection with mixed quantities thickness preferably determined with reference to the alleged use (whether to focus on power output, energy or something else) and ionic conductivity of the battery. The typical thickness of the layer of active material positive electrode is between approximately 10 and 500 microns.

[0027] As described above, the negative electrode 113 formed on the same surface (upper surface in FIG. 1(A)) of shunts 111. The negative electrode 113 is a layer that includes a layer of active material negative electrode. Active material negative electrode is a part, is able to give ions during discharge and absorb ions during charging. There are no restrictions on the active material negative electrode, provided that it is reversible to absorb and give lithium. However, the preferred examples of active material negative electrode will include metal, such as Si or Sn, metal oxide, such as TiO, Ti 2 O 3 , TiO 2 , SiO 2 , SiO or SnO 2 , complex lithium oxide and transition metal, such as Li 4/3 Ti 5/3 O 4 , or 7 Li MnN, Li-Pb alloy, Li-Al alloy, Li, carbon material, such as natural graphite, artificial graphite, carbon black, activated carbon, carbon fiber, coke, soft carbon (soft soot) or solid (hyperplatys) carbon, etc. In addition, active material negative electrode preferably contains an element that forms the alloy with lithium. When instead of the traditional material based on carbon element is used, forming alloy with lithium may be obtained battery, demonstrating high energy density, high capacity and excellent output characteristics. One material or a mixture of two or more materials can be used as the active material negative electrode.

[0028] Examples forming alloy with lithium elements include Si, Ge, Sn, Pb, Al, In, Zn, H, Ca, Sr, Ba, Ru, Rh, Ir, Pd, Pt, Ag, Au, Cd, Hg, Ga, Tl, C, N, Sb, Bi, O, S, Se, Te and Cl. Of these elements preferred carbon material and/or at least one member selected from the group comprising Si, Ge, Sn, Pb, Al, In, and Zn, so that you can construct the battery with high capacity and superior energy density. Carbon material, Si and sm, especially preferred. These elements can be used separately or in combinations of two or more.

[0029] No specific limits on the size and shape of particles of active material negative electrode, and active material negative electrode can take a form similar to that described above active material positive electrode. Accordingly, its detailed description is omitted. In addition, similar to the active material of the positive electrode, the composition can be optionally enabled another substance, for example, the electrolyte, salt lithium increasing conductivity additive, etc. to improve the ionic conductivity.

[0030] Layer 12 electrolyte is, for example, a layer of polymer gel electrolyte. Electrolyte can be formed a multi-layered structure, so that the types of electrolyte and ratios of the components differ between layers formed on the side of the positive electrode and the negative electrode. When using gel polymer electrolyte ratio (mass ratio) between the polymer and the electrolyte solution, components of the gel polymer electrolyte, preferably set between 20:80 and 2:98, i.e. within that interval, where the share of electrolyte solution is comparatively high.

[0032] Solid polymer electrolyte or gel polymer electrolyte can be included in the positive electrode and/or negative electrode, as described above, and also to serve as a polymer electrolyte, which forms the battery. However, as the polymer electrolyte, which forms the battery, and included in the positive electrode negative electrode can be used in different or the same polymer electrolytes, and various polymeric electrolytes can be used on different layers.

[0033] No specific restrictions on the thickness of forming the battery electrolyte. However, this electrolyte is preferable as it is possible more subtle in that interval, where the electrolyte can function, with the aim of obtaining compact bipolar batteries. The typical thickness of a layer of solid polymer electrolyte is set between approximately 10 and 100 microns. However, the electrolyte can be easily established with the form that covers the top surface and the outer peripheral part of the lateral surface of the electrode (positive or negative electrode electrode), taking advantage of the characteristics of the mode of production, and therefore required features and performance can be implemented without formation of the electrolyte with practically constant thickness in all places.

[0034] Seal 13 is located between the upper and lower the electrodes around 111 positive electrode 112, negative electrode 113 layer and 12 of the electrolyte. Condensation 13 prevents contact between electrodes and short circuit on end parts of a layer of a single battery. Seal material 13 is based insulating properties, sealing properties to prevent loss of a solid electrolyte, sealing properties (waterproof) for prevention of penetration of a moisture outside, thermal stability at the operating temperature battery etc. For example, can be profitably used acrylic resin, polyurethane resin, epoxy resin, plastic resin, polypropylene resin, polyimide resin, rubber, nylon resin, etc. From these materials is especially preferred polyethylene resin, polypropylene resin and acrylic resin from the point of view of resistance to corrosion and chemical resistance, ease of production (film-forming the property and economic efficiency.

[0035] Electrode conclusion 20 includes elastic metal part 21, which comes in contact with power generating item 10. One end of the electrode o 20 led outwards from the outer coating material 30. Electrode conclusion 20 fulfilled, for example, of aluminium, copper, titanium, Nickel, stainless steel (SUS), of alloy or the like. Taking into account corrosion resistance, ease of production, economic efficiency, etc., aluminum especially preferred. Electrode conclusion 20 the positive electrode and electrode conclusion 20 the negative electrode can be made from the same or different materials. In addition, electrode conclusion 20 may be formed by the laying on each other in various materials a large number of layers.

[0036] As shown in FIG. 1(b) and 1(C), elastic metal part 21 electrode o 20 formed in such a way that, when it is not attached external force, at its center is separated from electricity-generating element 10, Vipera (up in FIG. 1(b) and 1(C)).

[0037] in Addition, in assembled state, is shown in FIG. 1(A), the outer cover material sealed so that its internal pressure is less than atmospheric pressure, for example, essentially in a vacuum state. In this state, the atmospheric pressure acts on the elastic metal part 21, so that the entire surface of the elastic metal parts 21 comes in contact (contact surface) with power generating item 10.

[0038] Elastic metal part 21 is elastic detail, which can deform when the application of an external force.

[0039] Outer cover material 30 comprises electricity-generating element 10. The outer cover material 30 is flexible. Different materials can be used for external coating material 30, such as sheet material made of composite multilayer films of polymer-metal, which is formed by covering metal (including alloy), such as aluminum, stainless steel, Nickel or copper, polypropylene film. The periphery of the outer coating material 30 sealed by the sealing (thermocline) after it was concluded electricity-generating element 10. In assembled state, is shown in FIG. 1(a), the inner space of the outer coating material 30 is essentially in a vacuum, i.e. at a pressure less than atmospheric pressure.

[0040] FIG. 2 is a form of illustrating actions and the effects of this option implementation, and FIG. 2(A) depicts the normal state, and FIG. 2(B) depicts the abnormal state.

[0041] In a state where the entire surface of the elastic metal parts 21 is in contact (surface contact) with power generating item 10, the current flows evenly on all surfaces. However, when there is something like an external short circuit temperature electricity-generating element 10 may increase. When the temperature electricity-generating element 10 increases, the electrolyte (the electrolyte solution) gasified, that leads to increase of internal pressure of the outer coating material. In this case, as shown in FIG. 2(B), elastic metal part 21 deformed so that at its center project, resulting elastic metal part 21 separated from electricity-generating element 10. Accordingly, the current can flow only near the periphery, and therefore the magnitude (strength) of the current limited. The result prevents the flow of excess current.

[0042] Periphery of the outer coating material 30 termoklina, but by partial reduction of the width of thermocline, in an appropriate location, you can form a flexible valve. Consequently, when the electrolyte (the electrolyte solution) gasified, that leads to increase of internal pressure of the outer coating material, the internal pressure is channelled through this flexible valve, so that the internal pressure of the outer coating material is maintained at atmospheric pressure. The result can be prevented excessive increase in the internal pressure of the outer coating material.

The second implementation

[0043] FIG. 3 is a type representing the second implementation bipolar battery on this invention, and FIG. 3(A) is the form in longitudinal section showing the assembled state, FIG. 3(C) is a species in the long term elastic metal parts electrode output state when it is not attached external power, and FIG. 3(a) is the form in the section-in FIG. 3(B).

[0044] it Should be noted that in the subsequent description of those parts that are similar to those described above functions were assigned identical to the reference position, and, where permissible, their repeated description was omitted.

[0045] As shown in FIG. 3(b) and 3(C), elastic metal part 21 electrode o 20 according to this version the implementation of the project toward generating electricity item 10 (down in FIG. 3(b) and 3(C)) in a neighborhood of its center, when it is not attached external force.

[0046] in Addition, in assembled state, is shown in FIG. 3(A), the outer cover material sealed so that its internal pressure is less than atmospheric pressure, for example, essentially in a vacuum state. In this state of atmospheric pressure acts on the elastic metal part 21 so that the entire surface of elastic metal part comes in contact (contact surface) with power generating item 10. Therefore, elastic metal part 21 constantly presses electricity-generating element 10 more strongly to its centre.

[0047] To facilitate understanding of the implementation of this option will now be described chemical reactions in the battery.

[0048] In the range of the normal operating voltage flows chemical reaction, is shown in the following Equation (1).

[0049] [Chemical formula 1]

R * +1/2H 2 → Alkyl ^ a ... (1)

[0050] in Addition, in areas of tension over-charging reactions proceed shown in the following Equations (2-1) (2-4).

[0051] [Chemical formula 2]

3CoO 2 →Co 3 4 O +O 2 ^ a b ... (2-1)

ROCO 2 R+3O 2 →3CO 2 ^ a b+3H 2 O ... (2-2)

ROCO 2 R+H 2 O→2ROH+CO 2 ^ a b ... (2-3)

LiPF 6 +H 2 O→LiF+2HF ^ a b+POF 3 ... (2-4)

[0052] moreover, in areas of tension over-discharging reactions proceed shown in the following Equations (3-1) or (3-2).

[0053] [Chemical formula 3]

ROCO 2 R+e +Li + +1/2H 2 →ROCO 2 Li p+Alkyl ^ a b ... (3-1)

ROCO 2 R+2e - +2Li + +H 2 →LiCO 3 p+R-R ^ a b ... (3-2)

[0054] Consequently, the gas released in normal operation, while over-charging and during over-discharging. The entire surface of the elastic metal parts 21 is in contact (surface contact) with power generating item 10, and therefore, when the gas is not kept in a layer of electrolyte, even the current flows on all surfaces. However, when allocated thus the gas is kept in a layer of electrolyte, current supply is deteriorating, and current at the periphery increases. The result is a locally formed areas with high current density. When the current density locally increases, can settle lithium ions by electrolytic deposition. The result is a local damage. Also, the battery may fall in a vicious circle in which the damage is distributed to the periphery.

[0055] in Addition, when you exercise of charge and discharge cycles may be emitted gas, especially at the initial stage, due to the formation of a film on the surface of the negative electrode, the decomposition of a solution of electrolyte, etc. When the gas emitted is held in a layer of electrolyte, the passage of current deteriorating. Moreover, the battery may fall in a vicious circle, which is called the further evolution of gas because of the spin-off gas uneven layer of electrolyte.

[0056] in Addition, as shown in FIG. 3(b) and 3(C), elastic metal part 21 electrode o 20 according implementation variant formed protruding towards generating electricity item 10 (down in FIG. 3(b) and 3(C)) in a neighborhood of its center, when it is not attached external force. Accordingly, in assembled state, is shown in FIG. 3(A)electricity generating item 10 is under constantly higher clamping force from elastic metal parts 21 in the direction of the centre. As a result, the gas released in a layer of electrolyte, easily moved to the neighborhood seal on the periphery, where pressing the power of less. This prevents the deterioration of the gas passage of current. Initially, no current flows in the vicinity of the seals, and therefore there are no problems with accumulation of gas.

[0057] FIG. 4 is the view of illustrating actions and the effects of this option implementation, and FIG. 4(a) depicts the normal state, and FIG. 4(B) depicts the abnormal state.

[0058] In a state where the entire surface of the elastic metal parts 21 is in contact (surface contact) with power generating item 10, the current flows evenly on all surfaces. However, when there is a breach of normal operation, such as an external short circuit temperature electricity-generating element 10 may become unnecessarily large. When the temperature electricity-generating element 10 increases, the electrolyte (the electrolyte solution) gasified, that leads to increase of internal pressure of the outer coating material. In this case, as shown in FIG. 4(C), elastic metal part 21 deformed so that to separate from electricity-generating item 10 in the areas different from areas near its center, so that the area near its center pokes in the direction of the electricity-generating element. Accordingly, the current can flow only near the center, and therefore, current limited. The result prevents the flow of excess current.

The third variant of realization

[0059] FIG. 5 is a type representing an elastic metal part of the electrode output in the third variant of realization bipolar battery on this invention, and FIG. 5(A) is a species in the long term elastic metal parts electrode output, and FIG. 5(C) is the form in the section-In FIG. 5(A).

[0060] Elastic metal part 21 of electrode conclusion under this implementation variant made such a form that at its center shoves down when it is not attached external force, and that the surface 21A peripheral region is located in one plane.

[0061] As described above, the outer cover material encapsulated in a state where its internal less than atmospheric pressure the pressure. This atmospheric pressure acts on the elastic metal part 21 electrode output through the outer cover material so that the elastic metal part 21 electrode output becomes flat. This peripheral region elastic metal parts 21 may run into a layer of polymer film outer coating material or similar, thereby damaging layer polymer film.

[0062] Consequently, in this case the implementation of elastic metal part 21 of electrode conclusion made such a form that, when it is not attached external power, the surface 21A peripheral region is located in one plane. With this structure, at least the surface 21A peripheral edge of elastic metal parts 21 electrode output is always in contact with outer cover material 30. Therefore, in the production process bipolar battery on this invention can be prevented damage to peripheral edge of elastic metal parts 21 layer polymer films outside of the casing material.

The fourth variant of implementation

[0063] FIG. 6 is a type representing an elastic metal part of the electrode output in the fourth variant of realization of bipolar battery on this invention, moreover FIG. 6(a) is a species in the long term elastic metal parts electrode output, and FIG. 6(C) is the form in the section-In FIG. 6(a).

[0064] On the peripheral edge of elastic metal parts 21 electrode conclusion on this invention provides covered with insulating resin section 21b.

[0065] In this structure, at least this is covered by an insulating resin section 21b elastic metal parts 21 electrode output is always in contact with outer cover material 30. Therefore, in the production process bipolar battery on this invention can prevent damage to the peripheral edge of elastic metal parts 21 layer polymer films outside of the casing material. In addition, even if a layer of polymer film outer coating material is damaged, covered with insulating resin section 21b prevents short circuit between the outer layer of metal coating material and elastic metal part 21 of electrode conclusion.

The fifth variant of implementation

[0067] bipolar battery 1 according to this variant of realization of the region's electricity generating electricity-generating element 10 divided into a number of areas. More specifically, as shown in FIG. 7(a) and 7(C), the positive electrode 112 and the negative electrode 113 divided into two, so that the field of generation of electricity generated in two places.

[0068] As shown in FIG. 7(C), elastic metal part 21 electrode output generated protruding closer to the surroundings of relevant centres of the areas of power generation electricity-generating element 10, when it is not attached external force. In addition, elastic metal part 21 made such a form that the surface 21A peripheral region and Central surface s are located in one plane.

[0069] In assembled state, as shown in FIG. 7(A), the relevant area of power generation electricity-generating element 10 are under the influence of constantly greater compressive force from elastic metal parts 21 in the direction of the centre. In other words, elastic metal part 21 constantly presses electricity-generating element 10 more strongly in the direction of the respective centers of the areas of electricity generation. Accordingly, gas emitted in the layer of electrolyte, easily moved to peripheral areas (areas in which the electrodes are not formed), where the compressive strength is small. In this area initially no current flows and gases do not accumulate, causing problems.

[0070] This invention is not limited to the above options implementation and may be subject to different changes and modifications in the framework of its technical ideas, and these changes and modifications, of course, included in the technical scope of the present invention.

[0071] As shown in FIG. 8, for example, the tail section of an elastic metal parts 21 can be twisted. Similarly, in this case, you can prevent damage to the peripheral end of elastic metal parts 21 layer polymer film outer coating material in the production process bipolar batteries.

[0072] in Addition, the fifth variant of realization of the positive electrode 112 and the negative electrode 113 divided into two, so that the field of generation of electricity generated in two places. Elastic metal part 21 of electrode output is then formed protruding towards the surroundings of the respective centers of the areas of power generation electricity-generating element 10, when it is not attached external force. However, as shown in FIG. 9, the area of power generation can be formed in one place, while an elastic metal part 21 electrode output generated sticking out in two places. Similarly, in this configuration, when the cause of disturbance to normal operation, such as an external short-circuit, resulting in excessive growth of temperature electricity-generating element 10, so that the electrolyte (the electrolyte solution) gasified, elastic metal part 21 deformed, as shown in FIG. 9(B). As a result, the current flows only near protruding shape, and therefore, current limited, so the excess current flow is prevented.

[0073] moreover, in the above implementations elastic metal part 21 formed protruding down at a point near its center, when it is not attached external force. However, elastic metal part 21 can be formed protruding in a line.

[0074] moreover, in the above implementations elastic metal part 21 described as part of the electrode o 20. Performing elastic metal part 21 at the same time, thus, prevent the increase in the number of structural elements that is privileged from the point of view of mass production. However, electrode conclusion 20 can be provided as a separate structural element.

[0075] also, the battery is not limited in lithium secondary battery and can be a primary battery, which cannot be recharged.

[0076] moreover, the above implementations can be properly combined.

[0077] This application claims the priority of an application for the Japanese patent no 2010-166858 filed in the patent office of Japan on 26 July 2010 the Contents of this proposal incorporated here by reference in its entirety.

2. Bipolar battery according to claim 1, with elastic metal part of (21) bulging towards generating electricity item (10), when it is not attached external power, and contact with electricity-generating element (10) in the surface contact, when it is attached external force.

3. Bipolar battery according to claim 1 or 2, with power generating element (10) includes the area of power generation, divided into many areas, and elastic metal part of (21) pokes in the direction of the appropriate areas of power generation electricity-generating element (10), when it is not attached external power, and contact with electricity-generating element (10) in the surface contact, when it is attached external force.

4. Bipolar battery according to claim 1 or 2, with elastic metal part of (21) is part of electrode conclusion (20) for removal of electricity generated by power generating item (10), to the outside of the outer coating material (30).

5. Bipolar battery according to claim 1 or 2, with elastic metal part of (21) made such a form that, when it is not attached external force, its surface peripheral region is located in one plane.

6. Bipolar battery under item 1 or 2, while peripheral edge of elastic metal parts (21) twisted so as to separate ourselves from the outer coating material (30).

7. Bipolar battery according to claim 1 or 2, with elastic metal part of (21) further comprises covered with insulating resin plot provided on the peripheral side.

8. Bipolar battery containing: electricity-generating element (10), formed by stacking stack of many bipolar electrodes, in which the electrode layer formed on the front and back sides of shunts, through a layer of electrolyte; elastic metal part of (21), intended for contact with electricity-generating element (10) so that constantly to press electricity-generating element (10) more strongly in the direction of the centre surroundings electricity-generating element (10); and the outer cover material (30), provided for accepting and understanding electricity-generating element (10) and elastic metal parts (21).