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Flexible-packaged high-power lithium iron phosphate power battery

A lithium iron phosphate and power battery technology, applied in the field of lithium-ion power batteries, can solve the problems of large heat generation and poor high-rate discharge performance, and achieve the effects of reducing heat release, improving electrical conductivity, and improving high-rate cycle performance.

Inactive Publication Date: 2015-04-29
SHANDONG SHENGONGHAITE ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of poor high-rate discharge performance and large heat generation of lithium iron phosphate power batteries, a packaged high-power lithium iron phosphate power battery is provided. The invention reduces the internal resistance of the battery and improves the high-rate discharge and high-rate of the battery. Cycling performance, so that it can better meet the application in electric vehicles

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] Preparation of the positive electrode sheet: Lithium iron phosphate particles with a particle size of 40-200 nm coated with graphene with a coating thickness of less than 3.5 nm are used as the positive electrode active material. Lithium iron phosphate, polyvinylidene fluoride, conductive carbon black, scaly graphite, and carbon nanotubes were prepared in a ratio of 90:5:3:1.5:0.5 to prepare positive electrode slurry, and coated on a positive electrode sheet assembly with a thickness of 19 microns Fluid-on, where the conductive coating (both sides) is 3 µm thick. The prepared area density is 220g / m 2 the positive plate.

[0020] Preparation of negative electrode sheet: Negative electrode slurry was prepared by preparing negative electrode active material 92%, sodium carboxymethyl cellulose, styrene-butadiene rubber, and conductive carbon black at a ratio of 91:2.5:1.5:4. The ratio of mesocarbon microspheres, artificial graphite, and hard carbon in the positive active ...

Embodiment 2

[0027] Preparation of the positive electrode sheet: Lithium iron phosphate particles with a particle size of 40-200 nm coated with graphene with a coating thickness of less than 3.5 nm are used as the positive electrode active material. Lithium iron phosphate, polyvinylidene fluoride, conductive carbon black, and scaly graphite were used to prepare positive electrode slurry according to the ratio of 91:5:2.5:1.5, and coated on the positive electrode current collector with a thickness of 19 microns, in which the conductive coating (Double sided) 3 microns thick. The prepared areal density is 250g / m 2 the positive plate.

[0028] Preparation of negative electrode sheet: Negative electrode slurry was prepared by preparing 92% negative electrode active material, sodium carboxymethyl cellulose, styrene-butadiene rubber, and conductive carbon black at a ratio of 92:2.5:1.5:3. The ratio of mesocarbon microspheres, artificial graphite, and hard carbon in the positive active material...

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Abstract

The invention relates to the technical field of a lithium ion power battery, and particularly relates to a flexible-packaged high-power lithium iron phosphate power battery. The flexible-packaged high-power lithium iron phosphate power battery comprises a positive electrode plate, a negative electrode plate, a diaphragm, an electrolyte, tabs, and an aluminum plastic film, wherein the surface of a current collector of the positive electrode plate is pre-coated with a conductive coating and then coated with a positive electrode material. Each of both the positive electrode material and a negative electrode material comprises the following compositions in percentage by weight: 88-92% of active substances, 3-6% of a binder and 4-8% of a conducting agent. Through applying the modified positive electrode material, the surface of a current collector of the positive electrode plate is pre-coated with the conductive coating, so that the conductivity performance of the positive electrode material can be improved, the internal resistance of the battery can be effectively reduced, and heat release of the battery when in high-rate discharge is reduced. A mixture formed by mesophase carbon microbeads, artificial graphite and hard carbon according to certain ratio is adopted as the negative electrode material, so that a good solid electrolyte membrane is favorably formed, and the high-rate cycle performance of the battery can be improved through adding a certain amount of hard carbon.

Description

technical field [0001] The invention relates to the technical field of lithium-ion power batteries, in particular to a soft-packaged high-power lithium iron phosphate power battery. Background technique [0002] Energy shortages and environmental pollution have aroused widespread concern around the world, and smoggy weather is even more of a headache for the government. Fuel vehicles are the main energy consumers and sources of air pollution, so all countries are vigorously researching and developing electric vehicles, and the improvement of the performance of power batteries, which are the core components of electric vehicles, is the key to the development of electric vehicles. [0003] Lithium iron phosphate with an olivine structure has a wide range of raw materials, low price, and environmental friendliness. Lithium iron phosphate batteries have high safety, long cycle life, and are stable in the electrolyte at high temperatures. They have good high-temperature cycle pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/66H01M4/36H01M4/58H01M4/587H01M10/052
CPCH01M4/364H01M4/5825H01M4/583H01M4/66H01M10/058Y02E60/10
Inventor 关成善宗继月张敬捧朱波青
Owner SHANDONG SHENGONGHAITE ELECTRONICS TECH
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