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Preparation method of flexible-package high-power lithium ion power battery

A power battery, high-power technology, applied in the manufacture of electrolyte batteries, battery components, non-aqueous electrolyte batteries, etc., can solve the problem of shortening the battery cycle performance conductive carbon black content, reducing battery energy density, increasing battery heat, etc. problem, to achieve the effect of shortening the current passing path, reducing heat generation, and reducing contact internal resistance

Active Publication Date: 2013-07-03
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem in the prior art that in order to prevent high-rate discharge, the heat generated by the battery tabs and the battery core is too large, shortening the cycle performance of the battery and increasing the content of conductive carbon black. energy density; in order to increase the high-rate cycle life of the battery, choose to increase the binder content, which will increase the internal resistance of the battery and increase the heat generation of the battery, so we provide a bidirectional tab and carbon-coated aluminum foil, which can slow down the heat generation of the battery , A method for preparing a soft-packaged high-power lithium-ion power battery that improves battery cycle performance

Method used

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  • Preparation method of flexible-package high-power lithium ion power battery

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Effect test

Embodiment 1

[0030] Preparation of positive pole piece: mix 90 parts by weight of lithium iron phosphate, 2 parts by weight of conductive carbon black Super Li, 3 parts by weight of carbon nanotubes, and 5 parts by weight of polyvinylidene fluoride, and add 150 parts by weight of N- Methyl pyrrolidone is stirred to form a slurry, which is evenly coated on the positive electrode base fluid carbon-coated aluminum foil, the coating density is 120g / ㎡, the carbon-coated aluminum foil thickness is 25 microns, the coating active material is conductive carbon black, and the coating thickness is unidirectional After drying at 3 micrometers at 110°C for 10 hours, it was rolled with a roller to make a positive pole piece.

[0031] Preparation of negative pole piece: Mix 92 parts by weight of lithium iron phosphate, 2 parts by weight of carbon nanotubes, and 8 parts by weight of polyvinylidene fluoride, and add 150 parts by weight of N-methylpyrrolidone and stir to form a slurry, Evenly coat the negative...

Embodiment 2

[0038] Preparation of positive pole piece: Mix 92 parts by weight of lithium iron phosphate, 3 parts by weight of conductive carbon black Super Li, 2 parts by weight of carbon nanotubes, and 3 parts by weight of polyvinylidene fluoride, and add 155 parts by weight of N- Methyl pyrrolidone is stirred to form a slurry, and it is evenly coated on the positive electrode base fluid carbon-coated aluminum foil, the coating density is 200g / ㎡, the carbon-coated aluminum foil thickness is 15 microns, the coating active material is conductive carbon black, and the coating thickness is unidirectional 0.5 micron, dried at 120°C for 11 hours and then rolled with a roller to make a positive pole piece.

[0039] Preparation of negative pole piece: Mix 90 parts by weight of lithium iron phosphate, 5 parts by weight of carbon nanotubes, and 8 parts by weight of polyvinylidene fluoride, and add 145 parts by weight of N-methylpyrrolidone and stir to form a slurry, Coat evenly on the negative base f...

Embodiment 3

[0046] Preparation of positive pole piece: mix 95 parts by weight of lithium iron phosphate, 5 parts by weight of conductive carbon black Super Li, 5 parts by weight of carbon nanotubes, and 6 parts by weight of polyvinylidene fluoride, and add 150 parts by weight of N- Methyl pyrrolidone is stirred to form a slurry, which is uniformly coated on the positive electrode base fluid carbon-coated aluminum foil, the coating density is 180g / ㎡, the carbon-coated aluminum foil thickness is 20 microns, the coating active material is conductive carbon black, and the coating thickness is unidirectional After drying at 120°C for 12 hours at 2 microns, it is rolled with a roller compactor to make a positive pole piece.

[0047] Preparation of negative pole piece: Mix 92 parts by weight of lithium iron phosphate, 3 parts by weight of carbon nanotubes, and 8 parts by weight of polyvinylidene fluoride, and add 155 parts by weight of N-methylpyrrolidone and stir to form a slurry, It is evenly coa...

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Abstract

The invention discloses a preparation method of a flexible-package high-power lithium ion power battery; the battery comprises a cathode piece, a diaphragm, an anode piece, an electrolyte, a tab, and an aluminum plastic film. The tab is a bidirectional tab; a cathode current collector is charcoal-coated aluminium foil. The beneficial effects of the invention are that with the bidirectional tab, during high-rate discharge of the battery, the current passing distance is shortened; the polarization is reduced; the heating amount is decreased; the battery rate cycle performance is prolonged; with the charcoal-coated aluminium foil used as the cathode current collector, the contact internal resistance between the cathode active substance and the collector is effectively reduced; the expansion degree of the active substance during high-rate cycle of the battery is reduced; and the high-rate discharge voltage and the rate cycle performance of the battery are effectively improved.

Description

Technical field [0001] The invention belongs to the field of lithium-ion power batteries, in particular a soft-packed high-power lithium-ion power battery. [0002] Background technique [0003] Lithium-ion power batteries have the advantages of high voltage, high energy density, good cycle performance, low self-discharge, no memory effect, and wide operating temperature range. Generally, the structure of a high-power lithium-ion power battery is: in the form of a laminate, the battery cell formed by the positive electrode sheet, the separator, and the negative electrode sheet is placed in a battery case such as an aluminum plastic film; or the battery core is made in the form of winding. Then weld one-way tabs, seal with aluminum plastic film, and inject electrolyte. [0004] In order to prevent the battery's tabs and cells from heating up during high-rate discharge and shorten battery cycle performance, the traditional method is to widen and thicken tabs, and adjust the formula t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M2/26H01M4/66
CPCY02E60/10Y02P70/50
Inventor 吕豪杰朱修锋陈军
Owner WANXIANG 123 CO LTD
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