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Method for preparing high-capacity lithium iron phosphate lithium ion battery for automobile

A lithium-ion battery and lithium iron phosphate technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of coating difficulty, difficulty in processing lithium iron phosphate, water absorption, etc., and achieve low cost and ensure Safe, even temperature distribution effect

Inactive Publication Date: 2012-10-24
上海索锂科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for preparing high-capacity lithium iron phosphate lithium ion battery for automobile
  • Method for preparing high-capacity lithium iron phosphate lithium ion battery for automobile

Examples

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Effect test

Embodiment 1

[0029] (1) According to weight percentage, put 86% conductive carbon powder, 0.5% conductive carbon black SP, 4% binder (SBR-CMC-LA132 system) and the rest of the solvent in the stirrer, vacuum 1700rpm Fully stir to make a slurry, and evenly coat the slurry on a 10 μm copper foil to obtain a negative electrode sheet of the battery;

[0030] (2) After drying, rolling, slitting, die-cutting, and stacking the positive pole pieces (50 positive pole pieces and 51 negative pole pieces), the above-mentioned negative pole pieces are made into batteries;

[0031] (3) Put the above-mentioned batteries into a plastic case after drying, package, and leak detection; wherein, the top of the plastic case is provided with a liquid injection hole, and a spring micro-opening safety valve is installed on the liquid injection hole;

[0032] (4) Vacuumize the above-mentioned packaged and dried battery, inject liquid, and put it aside;

[0033] (5) Precharge, high temperature (temperature: 45°C, a...

Embodiment 2

[0035] (1) According to weight percentage, put 94% conductive carbon powder, 2% conductive carbon black SP, 4% binder (SBR-CMC-LA132 system) and the rest of the solvent in the stirrer, vacuum 2100rpm Fully stir to make a slurry, and evenly coat the slurry on a 20 μm copper foil to obtain a negative electrode sheet of the battery;

[0036] (2) After drying, rolling, slitting, die-cutting, and stacking the positive pole pieces (80 positive pole pieces and 81 negative pole pieces), the above-mentioned negative pole pieces are made into batteries;

[0037] (3) Put the above-mentioned batteries into a plastic case after drying, package, and leak detection; wherein, the top of the plastic case is provided with a liquid injection hole, and a spring micro-opening safety valve is installed on the liquid injection hole;

[0038] (4) Vacuumize the above-mentioned packaged and dried battery, inject liquid, and put it aside;

[0039] (5) Precharge, high temperature (temperature: 45°C, agi...

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Abstract

The invention relates to a method for preparing a high-capacity lithium iron phosphate lithium ion battery for an automobile. The method comprises the steps of: (1) preparing a negative pole plate of the battery; (2) preparing a battery cell by carrying out drying, rolling, slitting and die cutting on the negative pole plate and superposing the negative pole plate with a positive pole plate; (3) packing the dried battery cell into a plastic shell, packaging, and detecting leakage, wherein the top end of the plastic shell is provided with a liquid injection hole which is provided with a safety valve; (4) carrying out vacuumizing liquid injecting on the packaged dried battery and standing; and (5) carrying out pre-charging, high temperature aging and forming on the battery to obtain a finished product battery. The method for preparing the high-capacity lithium iron phosphate lithium ion battery for the automobile provided by the invention is simple in process and low in cost, and the obtained lithium ion battery has the advantages of uniform temperature distribution, small internal resistance of the battery, no stress inside the battery, good rate discharge and good safety of the battery and the like so that the method for preparing the high-capacity lithium iron phosphate lithium ion battery for the automobile provided by the invention 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): H01M10/058H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 赖兴强帅鸿元
Owner 上海索锂科技股份有限公司
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