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Preparation method of low self-discharge nickel-metal hydride battery

A nickel-metal hydride battery, self-discharge technology, applied in the manufacture of alkaline batteries, battery electrodes, alkaline batteries, etc., can solve the problems of increased battery self-discharge, easy to lose powder, etc., to reduce self-discharge and less self-discharge Effect

Inactive Publication Date: 2015-02-18
ANHUI INNOVATION NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the bottom of the positive electrode of the battery is easy to drop powder, it will cause the self-discharge of the battery to increase after a period of time.

Method used

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  • Preparation method of low self-discharge nickel-metal hydride battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] See figure 1 and figure 2 As shown: a low self-discharge nickel-metal hydride battery, including a cylindrical steel case 10 , the upper opening of the steel case 10 is provided with a combined cap 30 through a sealing ring 20 . Meanwhile, the steel case 10 is provided with a positive electrode sheet 40 and a negative electrode sheet 60 separated by a diaphragm 50 .

[0024] The preparation method of the low self-discharge nickel-metal hydride battery comprises:

[0025] 1) Prepare the semi-finished positive electrode, the steps are:

[0026] a. Preparation of the positive electrode substrate: the positive electrode substrate adopts a surface density of 250g / m 2 Preparation of foamed nickel;

[0027] B, preparation of positive electrode surface material: get 800g of cobalt-coated spherical nickel hydroxide, 10g of cobaltous oxide or cobalt hydroxide, 2g of yttrium oxide, 8g of erbium oxide, 10g of PTFE emulsion with a mass percentage of 60%, 10g The CMC powder...

Embodiment 2

[0038] The structure of the low self-discharge nickel-hydrogen battery is the same as in Example 1, and its preparation method comprises:

[0039] 1) Prepare the semi-finished positive electrode, the steps are:

[0040] a. Preparation of positive electrode substrate: the positive electrode substrate adopts a surface density of 300g / m 2 Preparation of foamed nickel;

[0041] b. Preparation of positive electrode surface material: take 900g of cobalt-coated spherical nickel hydroxide, 50g of cobaltous oxide or cobalt hydroxide, 30g of zirconium dioxide, 10g of titanium dioxide, 10g of ytterbium oxide, and the mass percentage of 20g is 65%. PTFE emulsion, 20g of CMC powder, after that, mix the aforementioned materials;

[0042] c. Apply the surface material of the positive electrode evenly on the positive electrode substrate, and roll it to a thickness of 0.5 mm. After that, it is made into a semi-finished positive electrode after conventional cutting, spot w...

Embodiment 3

[0052] The structure of the low self-discharge nickel-hydrogen battery is the same as in Example 1, and its preparation method comprises:

[0053] 1) Prepare the semi-finished positive electrode, the steps are:

[0054] a. Preparation of the positive electrode substrate: the positive electrode substrate adopts a surface density of 500g / m 2 Preparation of foamed nickel;

[0055] b, preparation of positive electrode surface material: get 950g of cobalt-coated spherical nickel hydroxide, 100g of cobaltous oxide or cobalt hydroxide, 10g of yttrium oxide, 20g of erbium oxide, 70g of titanium dioxide, 30g of 70% by mass PTFE emulsion, 30g of CMC powder, after that, mix the aforementioned materials evenly;

[0056] c. Spread the surface material of the positive electrode evenly on the positive electrode substrate, and roll it to a thickness of 0.7mm. Afterwards, after conventional cutting, spot welding of tabs, and softening, the positive electrode semi-finished product is made;

...

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Abstract

The invention discloses a preparation method of a low self-discharge nickel-metal hydride battery. The preparation method comprises steps as follows: preparation of a semi-finished product of a positive pole, preparation of a semi-finished product of a negative pole, preparation of glue for soaking bottom ends of the positive pole and the negative pole, soaking, electrolyte preparation, assembly and the like. According to the preparation method of the low self-discharge nickel-metal hydride battery, a positive pole substrate adopts foamed nickel, positive pole substances comprise a spherical nickel hydroxide active substance, a conductive agent, a bonding agent and an additive, the additive comprises cobalt monoxide and cobaltous hydroxide, the electrolyte is ternary electrolyte comprising potassium hydroxide, sodium hydroxide and lithium hydroxide, and further, a positive plate adopts a bottom gumming technology and diaphragm paper for a bottom welding technology during a manufacturing process, so that positive powder is prevented from falling to the bottom of a steel shell and is contacted with the negative pole, and self-discharge of the battery is reduced; and the test proves that the electrical charge retention rate of the battery prepared with the preparation method can still be higher than 88% after stored for two years at the normal temperature of 25 DEG C.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of a low self-discharge nickel-metal hydride battery. Background technique [0002] At present, in the battery manufacturing industry, due to the influence of materials, manufacturing process, formula and other related factors, the self-discharge problem of batteries has not been well resolved. Among them, the self-discharge of nickel-metal hydride batteries can even reach more than 30%. In order to reduce the self-discharge of nickel-metal hydride batteries, many battery manufacturers have applied sulfonated diaphragms, low self-discharge positive and negative active materials and ternary electrolytes to batteries, which alleviated the self-discharge situation to a certain extent. However, since the bottom of the positive electrode of the battery is easy to drop powder, the self-discharge of the battery increases after a period of time. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/28H01M4/66H01M4/52H01M4/62H01M10/26H01M4/26
CPCH01M4/26H01M4/28H01M4/62H01M4/661H01M10/28Y02E60/10Y02P70/50
Inventor 黄鹏李华章翟恩宏
Owner ANHUI INNOVATION NEW ENERGY
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