Less-maintenance valve-controlled alkaline secondary battery

Abstract

The invention discloses a less-maintenance valve-controlled alkaline secondary battery. The battery comprises a battery shell and a polar plate group arranged in the battery shell. An upper portion isa tightly assembled barren liquor structure, and a gas-liquid-solid interface is formed to support a hydrogen-oxygen composite function. An electrolyte stored at a bottom can be adsorbed by using a capillary adsorption effect of a lower end of a blank extension diaphragm reserved by the polar plate group so that certain saturation balance is kept. The electrolyte at the bottom of the battery shell can exist in a liquid state or in a gel state. Deformation of expansion powder removal of the electrode due to soaking of the excessive electrolyte is overcome, premature drying of the electrolyte is avoided, and a service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a low-maintenance valve-regulated alkaline secondary battery. Background technique [0002] Among the alkaline secondary battery systems, metal hydride-nickel batteries, zinc-nickel batteries, and iron-nickel batteries are the mainstream. The advantages are that they do not pollute the environment during production and use, and have the advantages of recyclability and environmental protection. Its structure generally adopts the form of sealed poor liquid, but the internal pressure of the battery will increase during the charging and discharging process of the battery in a sealed state, so the internal pressure can only be resisted by means of a cylindrical metal shell, so alkaline secondary batteries The production of batteries is limited to small cylindrical structures such as AA, SC, and D types. So far, the application of large-capacity batteries has no...

AI Technical Summary

Problems solved by technology

Its structure generally adopts the form of sealed poor liquid, but the internal pressure of the battery will increase during the charge and discharge process of the battery in a sealed state, so the internal pressure can only be resisted by means of a cylindrical metal shell, so alkaline secondary batteries The production of batteries is limited to small cylindrical structures such as AA, SC, and D. So far, the application of large-capacity batteries has not been seen in the market.

Another reason that restricts the popularization of large-capacity batteries is: when the battery is in a liquid-rich state, since the current process basically adopts pulping technology, good adhesion is required between the current collector and the dressing, and binders are generally used as curing materials. At the same time, taking into account the conductivity and the wettability of the electrolyte, the amount of the binder should not exceed the range of 5-10%. Due to the large change in the molar volume of the active material during the charge and discharge process, the active material on the electrode will expand and fall off. Short circuit or conductivity failure, which affects the service life

[0003] In the state of poor liquid, due to the inevitable overcharge phenomenon during use, and the small decomposition voltage window of the aqueous electrolyte, there will be oxygen and hydrogen evolution processes. When the internal pressure of the battery is too high, the pressure limiting valve opens Finally, the escape of gas will cause the electrolyte to dry up, the internal resistance will increase, the temperature will rise, and the battery will fail.

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