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Manufacturing method for flexibly-packaged lithium ion battery using composite gel diaphragm

A lithium-ion battery and composite gel technology, applied in the field of soft-pack lithium-ion battery production, can solve problems such as low hardness, affecting battery safety and service life, deformation, etc., to achieve cycle performance and safety performance improvement, battery hardness and energy high density effect

Inactive Publication Date: 2017-03-08
ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the hardness of the soft-pack lithium-ion battery in the prior art is low, and the external force is easy to deform it during use, thereby affecting the safety and service life of the battery. Strong, can improve the battery cycle performance and safety performance of the soft-pack lithium-ion battery manufacturing method using composite gel separator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (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;

[0028] (2) Making the negative electrode sheet: after the negative electrode active material, conductive agent and binder are made into the negative electrode slurry according to the required ratio, it is continuously and evenly coated on the copper foil, and it is dried, rolled, and cut Afterwards, the negative pole piece is obtained;

[0029] (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 45°C, and evacuate to -0.08MPa, stop heating after baking for 2.5 hours, an...

Embodiment 2

[0040] (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;

[0041] (2) Making the negative electrode sheet: After the negative electrode active material, conductive agent and binder are made into the negative electrode slurry according to the required ratio, it is continuously and evenly coated on the copper foil, and it is dried, rolled, and cut Afterwards, the negative pole piece is obtained;

[0042] (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, an...

Embodiment 3

[0053] (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;

[0054] (2) Making the negative electrode sheet: after the negative electrode active material, conductive agent and binder are made into the negative electrode slurry according to the required ratio, it is continuously and evenly coated on the copper foil, and it is dried, rolled, and cut Afterwards, the negative pole piece is obtained;

[0055] (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 in a vacuum oven with a constant temperature of 50°C, and evacuate to -0.09MPa, stop heating after baking for 3 hours, and ta...

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Abstract

The invention discloses a manufacturing method for a flexibly-packaged lithium ion battery using a composite gel diaphragm. The manufacturing method comprises the following steps of (1) manufacturing a positive plate; (2) manufacturing a negative plate; (3) performing vacuum baking on a diaphragm; (4) manufacturing a cell; (5) performing hot-pressing and fusing; (6) performing temperature reducing and shaping; (7) manufacturing a battery; (8) baking the battery; (9) performing aging; (10) performing formation; (11) performing primary high-temperature aging; and (12) performing secondary high-temperature aging. According to the manufacturing method, a polypropylene film, the surface of which is coated with PVDF and HFP copolymer, is adopted as the diaphragm; the cell is subjected to hot-pressing and fusing creatively, so that the PVDF coated on the diaphragm and the electrode plates can be fused into one body; therefore, the unhealthy phenomena of electrode plate displacement and the like in the operating process of the cell can be avoided; and at the same time, other technological steps and technological parameters are optimized, so that that finally manufactured battery is relatively high in hardness, and the cycling performance and the safety performance of the battery are also improved.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a method for manufacturing a soft-pack lithium-ion battery using a composite gel diaphragm. Background technique [0002] Soft-pack lithium-ion batteries have been widely used in electronic products, aircraft models, vehicles, storage Energy, power tools, military aerospace and other fields. [0003] Traditional soft-pack lithium-ion batteries have low hardness. During use, external forces can easily deform them, which in turn affects battery safety and service life. With the application of batteries to the power field, the safety and long cycle life of batteries have become the long-term goals pursued by the lithium battery industry. Therefore, more in-depth research improvements are required. Contents of the invention [0004] The present invention aims to solve the problem that the hardness of the soft-pack lithium-ion battery in the prior art ...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M2/16H01M50/411H01M50/449
CPCH01M10/0587H01M50/449H01M50/411Y02E60/10Y02P70/50
Inventor 陈现宝任宁樊海英臧庆凤高海锋孙延先
Owner ZHEJIANG CHAOWEI CHUANGYUAN INDUSTRAIAL
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