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Formation method of sealed nickel metal hydride secondary battery

A technology of nickel metal hydride and secondary battery, which is applied in the direction of alkaline battery, alkaline battery manufacturing, climate sustainability, etc., and can solve the problems of long cycle and occupation of production equipment, etc.

Active Publication Date: 2006-01-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the fact that the usual formation method of nickel metal hydride accumulators not only needs a long cycle and takes up a large number of production equipment, but also causes the above-mentioned series of problems, the present invention proposes a method for formation of a sealed nickel metal hydride secondary battery, with To solve the above problems,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]95 parts by weight of commercially available spherical nickel hydroxide (1.5wt% Co and 3wt% Zn in solid solution) with an average particle diameter of 15 μm, add 5 parts by weight of cobalt monoxide with an average particle diameter of several microns, and add deionized water, 2wt% CMC The solution and 60wt% PTFE dispersion liquid are appropriate, stirred to make a paste and filled into a foamed nickel porous body with a porosity of 95%, after drying, trimmed and shaped to make an AA-type 1800mAh nickel positive electrode sheet.

[0021] Using MmNi 5 The negative electrode sheet made of similar hydrogen storage alloy powder and the polypropylene diaphragm are combined with the above positive electrode to form an electrode group and inserted into the AA-shaped steel shell, and the alkaline electrolyte with a specific gravity of about 1.30, mainly potassium hydroxide, is injected and sealed. AA-shaped cylindrical sealed nickel metal hydride secondary battery with a capacit...

Embodiment 2

[0029] Using the same raw materials and manufacturing process as in Example 1, an AA-shaped cylindrical sealed nickel-metal hydride secondary battery with a capacity specification of 1800 mAh was manufactured. It takes about 1 hour from injecting alkaline electrolyte to sealing. Charge each battery immediately after sealing, charging at 0.25C for 20 minutes, 0.25C for 32 minutes, 0.4C for 12.5 minutes, 0.4C for 15 minutes, 0.8C for 6 minutes, 0.8C for 7.5 minutes, and 1C for 5 minutes . After the initial charge, each battery was placed in an atmosphere of 45°C for 4 hours, then charged at 0.2C for 6 hours, matured in an atmosphere of 45°C for 8 hours, and then discharged at 0.2C, and cut off when the voltage was 1.0v. The various batteries mentioned above are named B 1 , B 2 , B 3 , B 4 , B 5 , B 6 , B 7 , as in Example 1, the discharge capacity was also measured to obtain the weight specific capacity, and the voltage was measured after 28 days of discharge state stora...

Embodiment 3

[0033] The same raw materials and manufacturing process as in Example 1 were used to manufacture a AA-shaped cylindrical sealed nickel-metal hydride secondary battery with a capacity specification of 1800mAh, wherein it was about 1 hour from the injection of the alkaline electrolyte to the sealing. After each battery was sealed, Immediately charge at 0.5C for 10 minutes. After initial charging, each battery was placed in room temperature atmosphere for 4 hours, 8 hours and 45°C atmosphere for 2 hours, then charged at 0.2C for 6 hours, matured in 45°C atmosphere for 8 hours, and then discharged at 0.2C with a voltage of 1.0 expires at v. Each of the above batteries is C 1 、C 2 、C 3 . As in the examples, the discharge capacity was also measured to obtain the weight specific capacity, and after 28 days of storage in the discharged state, the voltage was measured to obtain the voltage drop and capacity recovery rate. The corresponding data are shown in Table 3.

[0034] ...

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PUM

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Abstract

This invention relates to a formation method for a closed Ni hydride secondary battery, which takes a hydrogen storage alloy as the negative active substance to be the negative, the active substance NiOH is taken as the main body added by Co as the conductive to comprise the positive and a membrane is put between the negative and positive to compose an electrode group to the injected with basic electrolyte to be closed to constitute a closed Ni hydride secondary battery characterizing in charging initially with 0.25-1C and 0.08C at the least after two hours of basic electrolyte charging then to be put aside for 2-8 hours under 45deg.C. The secondary battery can guarantee high discharge volume without increasing volumes of Co.

Description

technical field [0001] The present invention relates to a method for forming a sealed nickel metal hydride secondary battery. Background technique [0002] The sealed nickel metal hydride secondary battery is composed as follows: the hydrogen storage alloy capable of electrochemically absorbing and releasing hydrogen is used as the negative electrode active material to form the negative electrode, the active material nickel hydroxide is the main body, and metal cobalt or cobalt compound is added as the conductive agent to form the positive electrode. 1. A diaphragm is sandwiched between the positive poles to form an electrode group, and the alkaline electrolyte is injected into it, and the seal is sealed to form a closed nickel metal hydride secondary battery. [0003] In recent years, with the popularity of portable small electronic devices and instruments, the market demand for small secondary batteries is increasing. Among them, nickel hydroxide is used as the positive e...

Claims

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Application Information

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IPC IPC(8): H01M10/28
CPCY02E60/124Y02E60/10Y02P70/50
Inventor 李维耿伟贤
Owner BYD CO LTD
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