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Negative plate with heat dissipation structure, preparation method of negative plate and lithium ion battery

A lithium-ion battery and heat dissipation structure technology, which is applied in the direction of negative electrodes, structural parts, battery electrodes, etc., can solve the problems of reducing battery energy density and increasing the space occupied by negative electrodes, so as to improve heat dissipation performance, prevent thermal runaway, and save energy. The effect of manpower, material resources and production cost

Pending Publication Date: 2022-06-03
BEIJING WELION NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the invention additionally introduces a heat-conducting foil in the negative electrode sheet, which reduces the energy density of the battery to a certain extent and increases the occupied space of the negative electrode sheet

Method used

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  • Negative plate with heat dissipation structure, preparation method of negative plate and lithium ion battery
  • Negative plate with heat dissipation structure, preparation method of negative plate and lithium ion battery
  • Negative plate with heat dissipation structure, preparation method of negative plate and lithium ion battery

Examples

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Embodiment 1

[0059] This embodiment provides a figure 1 The shown negative electrode sheet with a heat dissipation structure and a preparation method thereof, the negative electrode sheet with a heat dissipation structure comprises a first thermally conductive coating 1, a first negative electrode coating 2, a current collector 3, and a second negative electrode coating layered in sequence 4 and the second thermally conductive coating 5, the thickness of the first thermally conductive coating 1 and the second thermally conductive coating 5 are both 3 μm, and respectively include graphene with a purity of 100wt%, and the graphene is a multi-layer sheet structure , and the thickness is 5nm.

[0060] In this embodiment, the preparation method includes the following steps:

[0061] (1) the negative electrode slurry is evenly coated on both sides of the current collector 3 to form the first negative electrode coating 2 and the second negative electrode coating 4 respectively to obtain a negati...

Embodiment 2

[0065] This embodiment provides a figure 1 The shown negative electrode sheet with a heat dissipation structure and a preparation method thereof, the negative electrode sheet with a heat dissipation structure comprises a first thermally conductive coating 1, a first negative electrode coating 2, a current collector 3, and a second negative electrode coating layered in sequence 4 and the second thermally conductive coating 5, the thickness of the first thermally conductive coating 1 and the second thermally conductive coating 5 are both 1 μm, and respectively include copper powder with a purity of 98wt%, the particle size of the copper powder D50=1nm .

[0066] In this embodiment, the preparation method includes the following steps:

[0067] (1) the negative electrode slurry is evenly coated on both sides of the current collector 3 to form the first negative electrode coating 2 and the second negative electrode coating 4 respectively to obtain a negative electrode sheet;

[0...

Embodiment 3

[0071] This embodiment provides a figure 1 The shown negative electrode sheet with a heat dissipation structure and a preparation method thereof, the negative electrode sheet with a heat dissipation structure comprises a first thermally conductive coating 1, a first negative electrode coating 2, a current collector 3, and a second negative electrode coating layered in sequence 4 and the second thermally conductive coating 5, the thickness of the first thermally conductive coating 1 and the second thermally conductive coating 5 are both 5 μm, and respectively include silver powder with a purity of 99wt%, the particle size of the silver powder D50=500nm.

[0072] In this embodiment, the preparation method includes the following steps:

[0073] (1) the negative electrode slurry is evenly coated on both sides of the current collector 3 to form the first negative electrode coating 2 and the second negative electrode coating 4 respectively to obtain a negative electrode sheet;

[0...

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Abstract

The invention provides a negative electrode plate with a heat dissipation structure, a preparation method of the negative electrode plate and a lithium ion battery. The negative electrode plate with the heat dissipation structure comprises a first heat conduction coating, a first negative electrode coating, a current collector, a second negative electrode coating and a second heat conduction coating which are sequentially stacked, and the first heat conduction coating and the second heat conduction coating respectively comprise a heat conduction material. The preparation method comprises the following steps: (1) uniformly coating two sides of a current collector with negative electrode slurry to respectively form a first negative electrode coating and a second negative electrode coating so as to obtain a negative electrode plate; and (2) uniformly coating two sides of the negative electrode plate obtained in the step (1) with heat-conducting slurry, forming a first heat-conducting coating on the surface of the first negative electrode coating, forming a second heat-conducting coating on the surface of the second negative electrode coating, and drying to obtain the negative electrode plate with the heat dissipation structure. The negative plate provided by the invention is particularly suitable for the lithium ion battery with high energy density, the heating temperature rise of the battery is reduced, and the heat dissipation performance and the safety performance in the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a negative electrode sheet, in particular to a negative electrode sheet with a heat dissipation structure, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in the electric vehicle industry because of their high energy density. However, during long-term use, overcurrent, overcharge, internal lithium dendrites, extrusion, mechanical shock, puncture, or other abuse conditions can cause internal short circuits in the battery. When the Joule heat caused by the internal short-circuit current accumulates and cannot be quickly diffused and discharged, an exothermic chain reaction occurs in the battery, which in turn triggers an exothermic reaction of materials such as a large area of ​​negative electrode, positive electrode, electrolyte, and diaphragm, which eventually leads to lithium ions The batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M10/0525H01M10/42H01M10/613H01M10/653H01M10/654
CPCH01M4/133H01M4/1393H01M10/0525H01M10/653H01M10/4235H01M10/654H01M10/613H01M2004/027Y02P70/50
Inventor 李文俊丁秋凤肖湘李永伟俞会根
Owner BEIJING WELION NEW ENERGY TECH CO LTD