Method for Improving Performance of Capacitive Ni-MH Battery

Abstract

The invention belongs to the technical field of square nickel-hydrogen power batteries, and in particular relates to a method for improving the performance of a capacitive nickel-hydrogen battery. The positive pole piece of the capacitive nickel-metal hydride battery is made of a sulfonated diaphragm, and a ceramic diaphragm is stacked between the positive pole piece and the negative pole piece of the bag; the electrolyte is composed of an alkaline solution and an additive, and the additive is cesium hydroxide. The positive pole piece of the present invention is wrapped in a bag made of sulfonated diaphragm, and the powder falls in the bag to effectively isolate the contact of the positive and negative electrodes, so as to better maintain the electrochemical performance of the battery. The Ni-MH power battery adopts the bag-making double-layer diaphragm lamination method to reduce the requirements for the sulfonated diaphragm. The thickness of the sulfonated diaphragm is 0.12-0.15mm, and the performance requirements such as alkali absorption rate and tensile strength are also reduced. It is completely possible to use domestic diaphragms. , greatly reducing the cost. The method improves the electrochemical performance of the battery, reduces the production cost, has a wider range of battery temperature, and effectively improves the safety of the battery such as furnace heat and acupuncture.

Description

technical field [0001] The invention belongs to the technical field of square nickel-hydrogen power batteries, and in particular relates to a method for improving the performance of a capacitive nickel-hydrogen battery. Background technique [0002] Existing power batteries use a single sulfonated diaphragm or several kinds of diaphragms grafted with sulfonated diaphragms. Power batteries have higher requirements for diaphragms (including thickness, surface density, alkali absorption rate, alkali absorption speed, and tensile strength. and air permeability, etc.), the diaphragm is generally imported from Japan, and the price is high. The original S-shaped laminations of the power battery cannot effectively isolate the positive and negative electrodes. With the increase in the number of charge and discharge of the battery, the positive and negative electrodes have different degrees of powder loss, and the original laminates cannot separate the fallen powder. , Over time, the...

AI Technical Summary

Problems solved by technology

[0002] Existing power batteries use a single sulfonated diaphragm or several kinds of diaphragms grafted with sulfonated diaphragms. Power batteries have higher requirements for diaphragms (including thickness, surface density, alkali absorption rate, alkali absorption speed, and tensile strength. and air permeability, etc.), generally imported from Japan, the price is high

The original S-shaped laminations of the power battery cannot effectively isolate the positive and negative electrodes. With the increase in the number of charge and discharge of the battery, the positive and negative electrodes have different degrees of powder loss, and the original laminates cannot separate the fallen powder. , over time reduces the electrochemical performance of the battery

The composition and concentration of the electrolyte affect the discharge capacity and operating temperature of the battery. The electrolyte level is KOH alkaline aqueous solution. The operating temperature of the battery is generally -20°C-60°C. It is restricted in the severe cold of the three north regions and the hot south.

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