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A composite method of lithium ion battery pole piece and separator and its application in battery preparation

A lithium-ion battery and separator technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as poor processing performance, achieve good machinability, reduce belt breakage problems, and reduce the probability of belt breakage Effect

Active Publication Date: 2022-07-12
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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  • A composite method of lithium ion battery pole piece and separator and its application in battery preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In this example, the preparation method and steps of the wound square aluminum shell 20100140 type battery are taken as an example to illustrate the application of the composite method of the lithium ion battery pole piece and the separator of the present invention in the battery preparation. The process flow chart of lithium-ion battery preparation is as follows: figure 1 shown.

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

[0029] Positive slurry: Lithium iron phosphate (10kg), SP, composite conductive agent and PVDF are dissolved and dispersed in a certain amount of NMP according to the ratio of 96:0.5:1:2.5 to 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 to obtain a solid content of about 45-50%, Anode slurry with viscosity of 2000-3000mpa.s;

[003...

Embodiment 2

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

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

[0048]Positive slurry: Lithium iron phosphate (10kg), SP, composite conductive agent and PVDF are dissolved and dispersed in a certain amount of NMP according to the ratio of 96:0.8:1:2.2 to 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 to obtain a solid content of about 45-50%, Anode slurry with viscosity of 2000-3000mpa.s;

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

[0050] Positive electrode coating: The curre...

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Abstract

The invention discloses a composite method of a lithium ion battery pole piece and a separator and its application in battery preparation, comprising the following steps: a. Positive electrode / negative electrode rolling: the positive electrode piece or the negative electrode piece is rolled on a rolling machine b. Hot-pressing compounding: the positive or negative electrode sheet is not rolled after rolling, but is directly pulled to the hot-pressing roller, and the diaphragm is pulled to the hot-pressing roller at the same time; The composite material of the positive electrode sheet and the separator or the composite material of the negative electrode sheet and the separator is prepared; c. Winding: the composite material of the positive electrode sheet and the separator and the composite material of the negative electrode sheet and the separator are directly drawn to the winding mechanism for winding. This compounding method advances the slitting and other processes to be completed before rolling. The diaphragm and the rolled pole piece are hot-pressed and compounded at the first time. The diaphragm balances the tension of the pole piece and avoids uneven tension in the subsequent processing. Greatly reduces the probability of breakage of the pole piece during subsequent processing.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite method of a lithium ion battery pole piece and a separator 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 electrode columns. The separator plays the role of isolating the positive and negative plates in the battery, preventing internal short circuit, and under the synergistic effect of the electrolyte, it provides a fast ion channel to complete the extraction and insertion of lithium ions during the electrochemical charging and discharging process. [0003] At present, the preparation process of wound lithium ion battery is usually divided into: slurry mixing, coating, r...

Claims

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Application Information

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Patent Type & Authority Patents(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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