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A kind of high-power nickel-metal hydride battery and its preparation method

A nickel-metal hydride battery, high-power technology, applied in nickel storage battery, alkaline storage battery manufacturing, alkaline storage battery and other directions, can solve the problems of increasing the internal resistance of the electrode, increasing the contact resistance between alloy particles, reducing the high rate performance of the electrode, etc. To achieve the effect of simple operation and reduce the high current charging capacity

Active Publication Date: 2015-09-02
宇恒电池股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the paste electrode is that the binder hinders the formation of the three-phase interface, namely the gas phase (oxygen), liquid phase (electrolyte), solid phase (hydrogen storage alloy) and the reduction of oxygen on the alloy surface, resulting in battery The internal pressure rises, and it cannot be charged with a large current; the contact resistance between the alloy particles is increased, thereby increasing the internal resistance of the electrode
Such a manufacturing process greatly reduces the high-rate performance of the electrode.

Method used

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  • A kind of high-power nickel-metal hydride battery and its preparation method
  • A kind of high-power nickel-metal hydride battery and its preparation method
  • A kind of high-power nickel-metal hydride battery and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0045] AA-type Ni-MH batteries with a nominal battery capacity of 1400mAh are used, and the base material of the negative electrode is 400PPI, 400g / m 2 The copper mesh and the particle size of the alloy powder are D10≥4μm, D50=40μm, D90=80μm and D10≥16μm, D50=60μm, D90=110μm, and the rest of the production methods of the two batteries are exactly the same. The comparison results of the discharge curves of the two batteries under the condition of 1 rate (1.4A) discharge current are shown in image 3 , the comparison results of the discharge curves of the two batteries under the discharge current condition of 10 times (14A) are shown in Figure 4 . It can be seen from the figure that the 1-rate discharge characteristics of the two batteries are not much different, but the high-rate discharge characteristics of the batteries with D10≥4μm, D50=40μm, and D90=80μm are much higher than those of the batteries with D10≥16μm, D50=55μm, and D90=110μm.

Embodiment 2

[0047] AA-type Ni-MH batteries with a nominal battery capacity of 1400mAh are used. The particle size of the alloy powder is D10≥4μm, D50=40μm, D90=80μm. The negative electrode substrates are respectively made of 400PPI and 200PPI copper mesh. The rest of the manufacturing methods of the two batteries exactly the same. The comparison results of the discharge curves of the two batteries under the condition of 1 rate (1.4A) discharge current are shown in Figure 5 , the comparison results of the discharge curves of the two batteries under the discharge current condition of 10 times (14A) are shown in Figure 6 . It can be seen from the figure that the 1-rate and high-rate discharge characteristics of the 400PPI battery are much higher than those of the 200PPI battery.

Embodiment 3

[0049] AA-type nickel-metal hydride batteries with a nominal battery capacity of 1400mAh are used. The particle size of the alloy powder is D10≥19μm, D50=58μm, and D90=120μm. The negative electrode substrates are respectively made of 200PPI copper mesh. The discharge curve of the battery under the discharge current conditions of 1 rate (1.4A) and 10 rate (14A) is shown in Figure 7 .

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Abstract

The invention belongs to the field of energy materials, in particular relates to a high-power nickel-metal hydride battery and a manufacturing method thereof. The high-power nickel-metal hydride battery comprises a negative plate, diaphragm paper and a positive plate, wherein the negative plate is manufactured by pressing a negative active material on a base material, the granularity sizes of the negative active material are D10 of not less than 3mu m, D50 of not more than 80mu m and D90 of not more than 130mu m; and a mesh is arranged in the base material and has a PPI of 150-1500, and the negative active material is pressed on the mesh. The invention has the advantages of increasing large-current charge capacity and high-rate discharge property, being simple in operation, rich in raw materials, low in cost, simple in equipment, high in qualified rate, and being suitable for batch large-scale production.

Description

technical field [0001] The invention belongs to the field of energy materials, in particular to a high-power nickel-hydrogen battery and a preparation method thereof. Background technique [0002] For a long time, the electric tool market has been monopolized by nickel-cadmium batteries, and cadmium is highly toxic and will cause serious pollution to the environment. In 2006, Europe began to ban cadmium. Therefore, a high-power nickel-metal hydride battery was developed for electric tools. It has a broad market prospect to replace nickel-cadmium batteries. [0003] The high-current charge and discharge performance of Ni-MH batteries is affected by the positive electrode, negative electrode, diaphragm and electrolyte, etc. The analysis and research on the impedance of Ni-MH batteries shows that: 40% of the impedance of MH / Ni batteries comes from the negative electrode, 30% comes from the positive electrode, and 20% of the impedance of the Ni-MH battery comes from the negative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/30H01M10/28H01M4/70
CPCY02E60/124Y02E60/10Y02P70/50
Inventor 王白浪潘洪革高明霞
Owner 宇恒电池股份有限公司