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Nickel-hydrogen battery diaphragm, and preparation method and nickel-hydrogen battery thereof

A nickel-metal hydride battery and diaphragm technology, which is applied to nickel storage batteries, alkaline storage batteries, battery pack components, etc., can solve the problem of high cost and achieve the effect of improving the charge retention rate.

Inactive Publication Date: 2012-01-11
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The above methods can all play a role in inhibiting the self-discharge of the battery, but whether it is a physical or chemical hydrophilization treatment of the polyolefin separator, or the use of a nylon-polyolefin separator instead of a polyolefin separator, there is a disadvantage of high cost.

Method used

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  • Nickel-hydrogen battery diaphragm, and preparation method and nickel-hydrogen battery thereof
  • Nickel-hydrogen battery diaphragm, and preparation method and nickel-hydrogen battery thereof
  • Nickel-hydrogen battery diaphragm, and preparation method and nickel-hydrogen battery thereof

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preparation example Construction

[0023] The specific embodiment of the present invention also provides a method for preparing a nickel-metal hydride battery diaphragm, comprising the steps of: depositing a hydrophilic polymer solution on a porous diaphragm substrate, and then drying to obtain the surface of the porous diaphragm substrate and at least part of the internal pores Ni-MH battery separators with hydrophilic polymers deposited in them. The method for depositing the hydrophilic polymer solution on the porous diaphragm substrate is not particularly limited, and the polymer solution can be coated (specific implementations such as spin coating or brush coating) on ​​the diaphragm substrate, or the diaphragm substrate can be immersed in in a hydrophilic polymer solution. Preferably, the diaphragm substrate is immersed in the hydrophilic polymer solution, preferably the porous diaphragm substrate is immersed in the hydrophilic polymer solution, and the hydrophilic polymer solution is completely soaked int...

Embodiment

[0028] 1. Prepare the diaphragm:

[0029] Weigh 1 part by weight of hydroxypropyl methylcellulose (HPMC, weight average molecular weight 20000, Guangzhou Chemical Reagent Factory) dry powder and add it to 100 parts by weight of deionized water, stir at 60°C for 3 hours to completely dissolve the polymer, and then add 1 part by weight of titanium dioxide (area density of titanium dioxide on the diaphragm substrate is 0.003g / m 2 ), and stirred for another 30 minutes. Immerse the diaphragm substrate (length×width×thickness=180mm×42.0mm×0.11mm, 4384 type polypropylene diaphragm produced by Freudenberg) and stir for 30 minutes, until all the pores inside the diaphragm substrate are deposited with hydrophilic After polymerizing (scanning electron microscope can be used to observe and detect that the pores in the diaphragm matrix are filled with the hydrophilic polymer), the diaphragm matrix is ​​taken out, the excess HPMC solution on the surface is scraped off, and dried to obtain ...

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Abstract

The invention provides a nickel-hydrogen battery diaphragm, which belongs to the technical field of nickel-hydrogen batteries and comprises a porous diaphragm substrate and hydrophilic polymers, wherein the hydrophilic polymers are deposited on the surface of the porous diaphragm substrate and in at least partial gaps inside the porous diaphragm substrate. The nickel-hydrogen battery diaphragm solves the technical problem that the self-discharge rate of the nickel-hydrogen battery using the traditional polyolefin porous diaphragm is higher, i.e. the charge conservation rate is lower. Compared with the nickel-hydrogen battery using a sulfonated diaphragm in the same model, the nickel-hydrogen battery using the diaphragm has the advantage that when the nickel-hydrogen battery is fully charged at the normal temperature, the charge conservation rate after the three-day displacement at 60 DEG C is averagely improved by about 10 percent.

Description

technical field [0001] The invention belongs to the field of nickel-hydrogen batteries, in particular to a diaphragm for a nickel-hydrogen battery, a preparation method for the diaphragm and a nickel-hydrogen battery using the diaphragm. Background technique [0002] The internally porous porous separator made of polyolefin material (that is, polyolefin separator, generally made by non-woven process, can also be called polyolefin non-woven fabric separator) is a commonly used separator in nickel-metal hydride batteries. The diaphragm material has good oxidation resistance and does not decompose in alkaline electrolyte. However, polyolefin fibers are hydrophobic fibers. When polyolefin separators are used as nickel-metal hydride battery separators alone, the battery’s self-discharge rate is relatively high. Therefore, polyolefin separators are often hydrophilized in industry to improve battery self-discharge performance. . The commonly used methods of hydrophilization treat...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/30
CPCY02E60/124Y02E60/10
Inventor 谢红波黄政益
Owner BYD CO LTD
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