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Fabrication method of high-capacity lithium iron phosphate battery for automobile

A lithium-ion battery and lithium iron phosphate technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, battery pack components, etc., can solve the problems of lithium iron phosphate processing difficulties, coating difficulties, water absorption, etc., to ensure safety and low cost , the effect of uniform temperature distribution

Inactive Publication Date: 2013-04-03
上海索锂科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Lithium iron phosphate has the characteristics of high specific energy, long cycle life, stable structure, good safety performance, low cost, no toxic and harmful substances, and no pollution to the environment. It is the most promising development potential for the preparation of large-capacity and high-power power batteries positive electrode material, but the processing of lithium iron phosphate is difficult, and it is easy to absorb water during the preparation of the slurry, resulting in difficulty in coating

Method used

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  • Fabrication method of high-capacity lithium iron phosphate battery for automobile
  • Fabrication method of high-capacity lithium iron phosphate battery for automobile

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) According to weight percentage, put 86% of lithium iron phosphate, 2% of conductive graphite KS-6, 5% of PVDF and the rest of nitrogen methyl pyrrolidone in a stirrer, vacuumize at 2400rpm and fully stir to form a slurry The slurry is evenly coated on a 15 μm aluminum foil to obtain a battery positive electrode sheet;

[0041] The preparation process of the above-mentioned slurry is specifically:

[0042] ① First bake lithium iron phosphate, conductive graphite KS-6 and PVDF in a vacuum oven;

[0043] ② Add PVDF to nitrogen methyl pyrrolidone, vacuumize and stir in the agitator at a speed of 2300 revolutions / min and 19 revolutions / min to obtain a uniform and transparent adhesive liquid system;

[0044] ③ Add conductive graphite KS-6 to the above-mentioned bonding liquid system, and vacuumize and stir at the speed of rotation 1600 rpm and revolution 16 rpm to obtain a uniform and stable system;

[0045] ④Add lithium iron phosphate into the agitator three times, vac...

Embodiment 2

[0053](1) According to weight percentage, put 90% lithium iron phosphate, 4% conductive carbon black SP, 5% PVDF and the rest of nitrogen methyl pyrrolidone in the agitator, vacuumize at 2800rpm and fully stir to make a slurry , apply the slurry evenly on the 25 μm aluminum foil to obtain the battery positive electrode sheet;

[0054] The preparation process of the above slurry is specifically:

[0055] ① First bake lithium iron phosphate, conductive carbon black SP and PVDF in a vacuum oven;

[0056] ② Add PVDF to nitrogen methyl pyrrolidone, vacuumize and stir in the agitator at a speed of 2500 revolutions / min and 21 revolutions / min to obtain a uniform and transparent adhesive liquid system;

[0057] ③Add the conductive carbon black SP to the above-mentioned bonding liquid system, vacuumize and stir at the speed of rotation 1800 rpm and revolution 18 rpm to obtain a uniform and stable system;

[0058] ④Add lithium iron phosphate into the agitator three times, vacuumize and...

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Abstract

The invention relates to a fabrication method of a high-capacity lithium iron phosphate battery for an automobile. The method comprises the steps of (1) fabricating positive pole pieces of the battery, (2) conducting drying, rolling, slitting and die cutting on the positive pole pieces, and laminating the positive pole pieces with negative pole pieces to be fabricated into a battery cell, (3) drying the battery cell, loading the battery cell into a plastic housing, packaging and detecting leakage, (4) vacuumizing the packaged and dried battery, injecting liquid and placing the battery, and (5) conducting precharge, high temperature ageing and formation on the battery to obtain the finished battery, wherein liquid injection holes are formed at the top end of the plastic housing, and safety valves are mounted on the liquid injection holes. The method is simple in technology and low in cost, the obtained lithium ion battery has the advantages of uniform temperature distribution, small internal resistance, no internal stress, good rate discharge, good safety, and the like, and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion batteries, in particular to a preparation method of lithium iron phosphate lithium ion batteries for large-capacity automobiles. Background technique [0002] Today, with the increasing shortage of oil resources and increasingly serious environmental pollution, the harmonious development of energy, resources, environment and human society has increasingly become the focus of social attention. It is seeking to develop alternative energy sources to traditional petrochemical energy, to realize the development of harmless resource industries, and to seek human harmony. Environmental harmony is particularly urgent. In modern society, people's demand for large-capacity and high-power batteries is becoming stronger and stronger, especially for power tools, electric bicycles, motorcycles, automobile power sources and backup power batteries. The currently used power batteries are mainly lead-acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/02H01M4/62
CPCY02E60/10Y02P70/50
Inventor 赖兴强帅鸿元
Owner 上海索锂科技股份有限公司
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