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Roll core used for wound lithium ion battery and capable of reducing internal temperature rise

A lithium-ion battery, wound-type technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of battery temperature rise, high-temperature hot area heat generation, etc., to reduce the temperature rise of the battery and reduce the temperature rise , The effect of reducing energy density loss

Active Publication Date: 2021-01-05
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the deficiencies of the prior art, the purpose of the present invention is to provide a winding core for lithium-ion batteries that can reduce the internal temperature rise, and the winding core for lithium-ion batteries can improve the performance of the winding core under high-rate charging. , The high-temperature hot zone inside the winding core for winding lithium-ion batteries that is not easy to dissipate heat produces a lot of heat, which makes the overall temperature rise of the battery too high

Method used

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  • Roll core used for wound lithium ion battery and capable of reducing internal temperature rise
  • Roll core used for wound lithium ion battery and capable of reducing internal temperature rise
  • Roll core used for wound lithium ion battery and capable of reducing internal temperature rise

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The positive electrode active material lithium cobaltate (particle size D 50 14 μm), binder PVDF, and conductive carbon black as a conductive agent were mixed according to a mass ratio of 90.5:4.5:5, and then N-methylpyrrolidone was added to stir and disperse to prepare positive electrode slurry 1 with an appropriate solid content.

[0047] The positive electrode active material lithium cobaltate (particle size D 50 14 μm), the binder PVDF, and the conductive agent conductive carbon black were mixed according to the mass ratio of 97.9:1:1.1, and then N-methylpyrrolidone was added to stir and disperse to prepare positive electrode slurry 2 with an appropriate solid content.

[0048] Use a coating machine to coat the positive electrode slurry 1 on both sides of the current collector at the head of the positive electrode current collector to form the first coating area; coat the positive electrode slurry 2 on the current collectors of other parts of the positive electrode ...

Embodiment 2-7

[0052] Other parts of Examples 2-7 are the same as Example 1, the only difference is that the areas of the first coating area and the second coating area are different, that is, the number of folds formed by the first coating area and the number of folds formed by the second coating area The number is different; the content of the conductive agent in the positive electrode slurry 1 and the positive electrode slurry 2 is different, and the D of the positive electrode active particles of the positive electrode slurry 1 and the positive electrode slurry 2 50 different, as shown in Table 1.

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Abstract

The invention provides a roll core used for a wound lithium ion battery and capable of reducing internal temperature rise. A positive plate is used in the roll core; the impedance value of the starting region of the positive plate is reduced by coating different positive active material layers on the starting region and other regions along the length direction of a positive current collector in the positive plate; and under high-rate charging, the heat production quantity of a high-temperature hot area which is difficult to dissipate heat in a battery is reduced, so that the temperature rise of the battery under high-rate charging is reduced. Besides, when the impedance is reduced by increasing the content of a conductive agent in the starting region of the positive plate, the other regions can still be coated with active substances with higher content, so that the technical effects of reducing the temperature rise of the battery and reducing the energy density loss are achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a winding core for a winding lithium ion battery capable of reducing internal temperature rise and a winding lithium ion battery containing the winding core. Background technique [0002] With the advent of the 5G era, users' demands on the battery life of mobile phones, laptops and other electronic products continue to increase. Therefore, while pursuing battery energy density, it is imperative to configure efficient fast charging capabilities for lithium-ion batteries, and continuously improving the charging rate of batteries has become the focus of lithium-ion battery development. However, fast charging at a high rate will significantly increase the heat generation of the battery, and a certain range of high-temperature hot spots will be formed inside the battery, and the internal heat is not easily transferred to the outside of the battery, resulting...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M10/0525H01M10/613H01M4/62H01M4/02
CPCH01M10/0587H01M10/0525H01M4/624H01M10/613H01M2004/028Y02E60/10Y02P70/50
Inventor 施超彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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