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Method for manufacturing soft package battery based on composite gel diaphragm

A composite gel and soft-pack battery technology, which is used in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc. The effect of improving cycle performance and safety performance, reducing electron migration distance, and improving low temperature performance

Inactive Publication Date: 2021-02-26
安徽理士新能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the material itself is an insulator, lithium iron phosphate has low electronic conductivity and poor lithium ion diffusivity, so the low-temperature performance is not ideal. In addition, the viscosity of the electrolyte increases under the low-temperature environment, which leads to a decrease in the conductivity of the lithium-ion battery. Restricts the low-temperature performance of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Making the positive electrode sheet: After making the positive electrode slurry according to the required ratio of the positive electrode active material, conductive agent and binder, it is continuously and evenly coated on the aluminum foil, and after drying, rolling, and slitting Positive pole piece;

[0036] (2) Making the negative electrode sheet: After making the negative electrode slurry according to the required ratio of the negative electrode active material, conductive agent and binder, it is continuously and evenly coated on the copper foil, and dried, rolled, and cut Afterwards, the negative pole piece is obtained;

[0037] (3) Diaphragm vacuum baking: choose a composite gel diaphragm as the diaphragm, the composite gel diaphragm is a polypropylene film coated with PVDF (vinylidene fluoride) and HFP (hexafluoropropylene) copolymer on the surface, put the diaphragm into a constant temperature of In a vacuum oven at 45°C, evacuate to -0.08MPa, stop heating...

Embodiment 2

[0048] (1) Making the positive electrode sheet: After making the positive electrode slurry according to the required ratio of the positive electrode active material, conductive agent and binder, it is continuously and evenly coated on the aluminum foil, and after drying, rolling, and slitting Positive pole piece;

[0049] (2) Making the negative electrode sheet: After making the negative electrode slurry according to the required ratio of the negative electrode active material, conductive agent and binder, it is continuously and evenly coated on the copper foil, and dried, rolled, and cut Afterwards, the negative pole piece is obtained;

[0050] (3) Diaphragm vacuum baking: choose a composite gel diaphragm as the diaphragm, the composite gel diaphragm is a polypropylene film coated with PVDF and HFP copolymer on the surface, put the diaphragm into a vacuum oven with a constant temperature of 55°C, and evacuate to -0.10MPa, stop heating after baking for 3.5 hours, and take out...

Embodiment 3

[0061] (1) Making the positive electrode sheet: After making the positive electrode slurry according to the required ratio of the positive electrode active material, conductive agent and binder, it is continuously and evenly coated on the aluminum foil, and after drying, rolling, and slitting Positive pole piece;

[0062] (2) Making the negative electrode sheet: After making the negative electrode slurry according to the required ratio of the negative electrode active material, conductive agent and binder, it is continuously and evenly coated on the copper foil, and dried, rolled, and cut Afterwards, the negative pole piece is obtained;

[0063] (3) Diaphragm vacuum baking: choose a composite gel diaphragm as the diaphragm, the composite gel diaphragm is a polypropylene film coated with PVDF and HFP copolymer on the surface, put the diaphragm into a vacuum oven with a constant temperature of 50°C, and evacuate to -0.09MPa, stop heating after baking for 3 hours, and take out t...

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PUM

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Abstract

The invention discloses a manufacturing method of a soft package battery based on a composite gel diaphragm. The manufacturing method comprises the following steps: S1, manufacturing a positive pole sheet and a negative pole sheet; S2, carrying out vacuum baking on a diaphragm; S3, manufacturing a roll core; S4, manufacturing a battery; S5, baking the battery; and S6, carrying out post-treatment on the battery. According to the invention, a polypropylene film coated with a PVDF and HFP copolymer on the surface is used as a diaphragm, and hot-pressing fusion is carried out on a battery core, sothat the PVDF coated on the diaphragm can be integrated with pole sheets so as to avoid undesirable phenomena of pole sheet displacement and the like in the operation process of the battery core; andthe battery core is cooled and shaped in a matching manner, other process steps and process parameters are optimized, and the sequence of each step is mutually associated and cooperated with the process parameters of each step, so that the hardness and the energy density of the finally prepared battery are relatively high, the pole sheets and the diaphragm are integrated, the electron migration distance is shortened, the low-temperature performance can be greatly improved, and the cycle performance and the safety performance are also improved.

Description

technical field [0001] The invention belongs to the technical field of making lithium ion batteries, in particular to a method for making a soft pack battery based on a composite gel diaphragm. Background technique [0002] Soft-pack lithium-ion batteries have been widely used in electronic products, aircraft models, vehicles, storage Energy, military aerospace and other broad fields. In particular, the soft-pack battery using lithium iron phosphate as the positive electrode active material has more obvious performance advantages such as service life and safety. [0003] Because the material itself is an insulator, lithium iron phosphate has low electronic conductivity and poor lithium ion diffusivity, so the low-temperature performance is not ideal. In addition, the viscosity of the electrolyte increases under the low-temperature environment, which leads to a decrease in the conductivity of the lithium-ion battery. Restricts the low-temperature performance of lithium-ion ...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/449H01M50/414H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈现宝董捷李昌辉
Owner 安徽理士新能源发展有限公司