Combination method of lithium ion battery pole piece and diaphragm and application of lithium ion battery pole piece and diaphragm to battery preparation

A lithium-ion battery and diaphragm technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as poor processing performance, and achieve the effect of reducing the probability of broken strips

Active Publication Date: 2019-07-19
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the technical problems existing in the background technology, the purpose of the present invention is to provide a composite method for a lithium-ion battery pole piece and a diaphragm, to solve the problem of poor processing performance of the battery pole piece in the prior art after rolling, and to change the current state of the art. The process steps of pole piece cutting and tab production are carried out after rolling. This method advances the cutting and other processes to be completed before the rolling process.

Method used

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  • Combination method of lithium ion battery pole piece and diaphragm and application of lithium ion battery pole piece and diaphragm to battery preparation
  • Combination method of lithium ion battery pole piece and diaphragm and application of lithium ion battery pole piece and diaphragm to battery preparation

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Embodiment 1

[0027] In this embodiment, the preparation method and steps of a wound-type square aluminum shell 20100140 battery are taken as an example to illustrate the application of the lithium-ion battery pole piece and diaphragm composite method in the battery production according to the present invention. Lithium-ion battery preparation process flow chart as shown in figure 1 shown.

[0028] (1) Positive / negative electrode mixing:

[0029] Positive electrode slurry: dissolve and disperse lithium iron phosphate (10kg), SP, composite conductive agent and PVDF in a certain amount of NMP according to the ratio of 96:0.5:1:2.5, and obtain a solid content of about 55% and a viscosity of 4000mpa. s positive electrode slurry; negative electrode slurry: artificial graphite (8kg), SP, CMC and SBR are dissolved and dispersed in a certain amount of water according to the ratio of 96:0.8:1.2:2, and the solid content is about 45-50%. Negative electrode slurry with a viscosity of 2000-3000mpa.s; ...

Embodiment 2

[0046] This embodiment takes the preparation method and steps of a wound cylindrical aluminum shell 32131 battery as an example to further illustrate the application of the composite method of a lithium-ion battery pole piece and separator in the present invention in battery preparation.

[0047] (1) Positive / negative electrode mixing:

[0048]Positive electrode slurry: dissolve and disperse lithium iron phosphate (10kg), SP, composite conductive agent and PVDF in a certain amount of NMP according to the ratio of 96:0.8:1:2.2, and obtain a solid content of about 55% and a viscosity of 4000mpa. s positive electrode slurry; negative electrode slurry: artificial graphite (8kg), SP, CMC and SBR are dissolved and dispersed in a certain amount of water according to the ratio of 95.5:1:1.3:2.2, and the solid content is about 45-50%. Negative electrode slurry with a viscosity of 2000-3000mpa.s;

[0049] (2) Positive / negative electrode coating:

[0050] Positive electrode coating: th...

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Abstract

The invention discloses a combination method of a lithium ion battery pole piece and a diaphragm and an application of the lithium ion battery pole piece and the diaphragm to the battery preparation.The method comprises the following steps: a, positive / negative pole roll pressing is carried out: a positive pole piece or a negative pole piece is subjected to roll pressing on a rolling press; b, hot pressing combination is carried out: the positive pole piece or the negative pole piece is not wound after being subjected to the roll pressing and is directly drawn to a hot pressing roll, and meanwhile, the diaphragm is drawn to the hot pressing roll; the positive pole piece or the negative pole piece and the diaphragm are aligned and then pass through the hot pressing roll to prepare a composite material of the positive pole piece and the diaphragm or a composite material of the negative pole piece and the diaphragm; and C, winding is carried out: the composite material of the positive pole piece and the diaphragm and the composite material of the negative pole piece and the diaphragm are directly drawn to a winding mechanism for winding. According to the combination method, the processes of cutting and the like are completed before rolling; the diaphragm and the rolled pole pieces are subjected to the hot pressing combination in first time; the diaphragm balances the tension of the pole pieces and avoids the non-uniform tension in the subsequent processing process; and the probability of breakage of the pole pieces in the subsequent processing process is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a composite method of lithium-ion battery pole pieces and separators and its application in battery preparation. Background technique [0002] Lithium-ion batteries are widely used in 3C digital and electric vehicles and other fields. Lithium-ion batteries are mainly composed of positive electrode sheets, negative electrode sheets, separators, electrolytes, external casings, and positive and negative poles. The separator plays the role of isolating the positive and negative plates in the battery to prevent internal short circuit, and under the synergy of the electrolyte, it provides a fast channel for ions to complete the extraction and insertion of lithium ions during the electrochemical charge and discharge process. [0003] At present, the preparation process of wound lithium-ion batteries is usually divided into: slurry mixing, coating, rolling, slitting, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M4/139H01M4/04
CPCH01M10/0587H01M10/0525H01M4/139H01M4/0435H01M4/0404Y02E60/10Y02P70/50
Inventor 欧阳浩淼何里烈王双双张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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