The method of filling the electrolyte nickel-hydrogen rechargeable battery

 

(57) Abstract:

The invention relates to the production of batteries, in particular to a method of filling electrolyte. The method of filling the electrolyte Nickel-hydrogen rechargeable battery includes a vacuum impregnation of the electrodes by the electrolyte to complete the filling and removal of surplus electrolyte evaporation of water. Before vacuum impregnated in the electrolyte and subsequent charging of the battery is heated to a temperature of 60 - 85oC. Evaporation of excess water from the electrolyte is from preheated to a temperature of 70-85oWith the battery in the camera, which supports a pressure equal to the elasticity of steam on the final electrolyte concentration. The determination of the number of remote water produced by condensation and measure its volume. The technical result improved filling electrolyte. 2 C.p. f-crystals, 1 Il.

The present invention relates to the field of electrical engineering and can be used when filling chemical current sources, namely for filling electrolyte Nickel-hydrogen rechargeable batteries filterpresses design with a common gas manifold.

Known methods of filling e the necessary degree of filling electrolyte electrochemical group is provided with a tank, from which the electrolyte gets into the electrochemical group with special porous wicks.

Thus, in the method according to PCT application N 99-11626 (H 01 M 10/34, etc. 04.10.90 g) is proposed to bring the electrolyte to the Nickel oxide electrode through the absorber from the module in which it is located. This design does not provide a complete soaking then electrochemical group of batteries because of their residual gazonapolnennoi and hydrophobicity. Not a complete soaking reduces the active surface of the Nickel oxide electrode. In addition, it leads to increase in weight and size characteristics of the Nickel-hydrogen rechargeable battery and overall deterioration of specific energy characteristics.

In the method described in U.S. patent N 5173376 (H 01 M 12/08, etc. 28.10.91 g), it is proposed to bring the electrolyte to the separator through the wick from electrolyte-adsorption layer. This method of filling electrolyte battery also does not provide a complete soaking Nickel oxide electrodes for the same reasons as the above method, and in addition, the battery has large dimensions. In addition, this method is desirable when filling electrolyte battery comprising a number of the considerably reduces the life of the battery.

In U.S. patent N 5128600 (H 01 M 10/10, etc. 17.12.90 g) described a method of removing excess electrolyte in a sealed battery by attaching the full battery of the battery to the collector of the electrolyte through the porous filter and subsequent charging of the battery at a given speed for a certain period of time. Released during oxygen creates pressure that pushes the excess electrolyte from the battery cells through the filter in the collection of the electrolyte. Control over the removal of the electrolyte is carried out by measuring the emitted charge of oxygen. This method does not provide an atomic uniformity of filling the electrolyte in view of the fact that the intensity of the oxygen evolution may change according to the battery cells, and therefore, the number of remote electrolyte of each item will be different.

Closest to the claimed method of filling electrolyte Nickel-hydrogen rechargeable battery is a way of charging the electrolyte is carried out using the apparatus described in the author's certificate N 1820427 (H 01 M 2/36, etc. 05.04.91,)

According to the method of filling electrolyte battery is suggested to be conducted using a preliminary degassing. Doserates a special indicator. Then measure the value of the free gas space and remove excess electrolyte by extrusion pressure.

The disadvantage of this method is that it does not ensures complete filling electrolyte pore volume of the battery, since the displacement of the excess electrolyte is not ensured uniformity in its removal of the battery cells in mind possible differences porous volume between the individual elements. In addition, this method does not provide a complete soaking then electrochemical group battery in consequence of their residual gazonapolnennoi and hydrophobicity. This leads to reduction of the active surface of the Nickel oxide electrodes.

In addition, this method is desirable when filling electrolyte battery, consisting of several elements in a single housing, because in applying it possible partecke electrolyte between the elements, which significantly reduces the lifetime of the battery. When filling same data by way of batteries in a single vessel is not removed electrolyte with the outer surface of the battery, which leads to the formation of electrolytic bridges between the elements and thus reduces the resource R is ical-hydrogen rechargeable battery, to ensure maximum filling electrolyte electrochemical pore space group battery and then put it in the number and concentration to the required size.

To solve the problem stated way of charging the electrolyte Nickel-hydrogen rechargeable battery comprising vacuum impregnation of the electrodes by the electrolyte to complete the filling and removal of surplus electrolyte evaporation of water, additionally comprising heating the Nickel-hydrogen rechargeable batteries before vacuum impregnation and subsequent operations until the temperature 60-86oC, evaporation of excess water from the electrolyte of preheated to a temperature of 70-85oC Nickel-hydrogen rechargeable batteries in the camera, which supports a pressure equal to the pressure of elasticity pair over a given electrolyte concentration, and the determination of the number of remote water by condensation and measure its volume.

Pre-heating the Nickel-hydrogen rechargeable battery to a temperature of 60-85oC before the evacuation and subsequent impregnation ensures removal from the pores electrochemical group of air and water that leads to and what about soaking.

The volume of the electrolyte, which must be left in the battery for drying (reducing the amount of electrolyte to a predetermined value) is set on the basis of the experimentally determined dependence of electrical characteristics from electronicsalready. Depending on the structure and composition of the electrochemical components of the group the value of the optimal electronicsalready can vary from 60 to 90%. According to the claimed technical solution reducing the amount of electrolyte to a predetermined value is performed on pre-heated to a temperature of 70-85oC batteries in the camera, which supports a pressure equal to the pressure of elasticity pair over a given electrolyte concentration.

The claimed temperature range due to the following. The battery's temperature is below 70oC does not provide a fast and efficient evaporation of water vapor from alkaline electrolyte.

When the battery's temperature is above 85oC irreversible structural changes of the active mass of the Nickel oxide electrode, which lead to the loss of electric battery capacity.

The determination of the number of remote water, according to the present method, is produced by its condensate, according to the present invention, is as follows according to the scheme shown in the drawing.

The assembled battery is placed in the chamber refills (1) and check for leaks. The camera refills and within it the battery is heated using the inside of the heater (9) power supply (5) to a temperature of 60-85oC. the temperature Control is conducted with the help of the sensor (10). Then spend the vacuum chamber refills, when opening the valve (14) system vacuum (2), together with the battery for at least 6 hours at a pressure of not more than 0,1105PA (0.1 kg/cm2). Pressure control pressure gauge (11). Then fill the chamber filling with electrolyte from the tank through the valve (12) to fill the battery. Closing the valve (14) to fill the space above the mirror of the electrolyte in the chamber filling with argon, opening the valve (13), - supply system argon (3). The battery is kept in the electrolyte within 6 hours, while controlling the temperature. After holding the electrolyte from the chamber refills squeeze argon in the tank (4) through the valve (12) and pull the camera filling to remove any residual electrolyte from the inner surface.

To bring the volume of the electrolyte to a predetermined value gradually reduces the Dreux (6), after that, the valve (14) is closed. Water evaporating from the electrolyte, condense in the heat exchanger (7), which is cooled by the coolant through the heat exchange system (8). The coolant can serve as water. The temperature should be sufficient to condense and to determine the concentration of the electrolyte (end) and the vapour pressure in the chamber refills. After collecting a specified number of condensate disable the heating chamber filling and fill it with argon to atmospheric pressure. When the battery has cooled, it is removed from the chamber filling and placed in technological capacity, filled with argon.

The described method was performed 40 refilling electrolyte Nickel-hydrogen rechargeable battery of the type NV-100 and 10 refills battery type NB-4. The inventive method showed high reproducibility by adjusting the amount of electrolyte in a Nickel-hydrogen rechargeable battery to a specified value. The most effective the inventive method when filling electrolyte Nickel-hydrogen rechargeable batteries, battery cells which are in a single vessel.

Sources of information

1. PCT N 99/11626, H 01 M 10/34, etc. 04.10.90,

2. Paten the construction of the USSR N 1820427, H 01 M 10/10, etc. 17.12.90,

1. The method of filling the electrolyte Nickel-hydrogen rechargeable battery comprising vacuum impregnation of the electrodes by the electrolyte to complete the filling and removal of surplus electrolyte evaporation of water, characterized in that before vacuum impregnated in the electrolyte and the subsequent operations of charging the battery is heated to a temperature of 60 - 85oC.

2. The method of filling the electrolyte Nickel-hydrogen rechargeable battery under item 1, characterized in that the evaporation of excess water from the electrolyte is provided from pre-heated to a temperature of 70 - 85oC batteries in the camera, which supports a pressure equal to the pressure of elasticity pair over a given electrolyte concentration.

3. The method of filling the electrolyte Nickel-hydrogen rechargeable battery according to p. 2, characterized in that the determination of the number of remote water is carried out by condensing and measuring its volume.

 

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