Pole piece and battery

A technology of pole pieces and tabs, which is applied in the field of pole pieces and batteries using the pole pieces, can solve the problems of low battery safety, too thick batteries, poor charge and discharge rate performance, etc., and achieve good safety and great practicality Significance, improvement of safety and effect of charge and discharge rate

Active Publication Date: 2021-05-04
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a pole piece to at least solve the problems in the above-mentioned prior art that the battery cell is too thick near the tab of the pole piece and the resulting low battery safety and poor charge-discharge rate performance.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0037] The pole piece of the present invention can be prepared according to conventional methods in the field such as the coating method. For example, in one embodiment, the preparation method can specifically include: after coating the primer layer 2 on the surface of the current collector 1, and then coating the primer layer 2 The surface is coated with an active material layer 3, and then after removing the undercoat layer and the active material layer at the preset tab position, welding the tab on the current collector at the preset tab position, and according to the width and thickness of the preset recessed area and other parameters to remove the functional layer in the preset recessed area to form a recessed area 32 to obtain a pole piece; wherein, the gravure coating method is used to coat the primer layer, such as image 3 As shown, the gravure roll used in the gravure coating method is provided with a reserved tab position 9, and the preset tab position on the current...

Embodiment 1

[0053] The positive electrode sheet of this embodiment includes a positive electrode current collector and a positive electrode functional layer coated on both surfaces of the positive electrode current collector. One surface of the positive electrode current collector is provided with a positive electrode ear (the positive electrode ear is located in the middle of the positive electrode sheet), and the positive electrode on this surface The functional layer is composed of a normal area away from the positive tab and a recessed area close to the positive tab, the thickness of the recessed area is smaller than that of the normal area; the other surface of the positive current collector is provided with an uncoated area corresponding to the position of the positive tab The positive electrode functional layer on the other surface is the same as the positive electrode functional layer on the surface provided with positive tabs (composed of the above-mentioned normal area and the rec...

Embodiment 2

[0060] The difference between this example and Example 1 is that the thickness of the undercoat layer is 7 μm, the thickness of the positive electrode active material layer in the depressed area is 50 μm, and the depth of the depressed area is 60 μm, and other conditions are the same as in Example 1.

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Abstract

The invention provides a pole piece and a battery. The pole piece comprises a current collector and a functional layer located on the first surface of the current collector, wherein the first surface is provided with a tab, the functional layer is composed of a normal region away from the tab and a sunken region close to the tab, and the thickness of the sunken region is smaller than that of the normal region. The pole piece can effectively avoid the problem that the part, close to the tab, of a battery cell is too thick, and improve the safety, the charge-discharge rate and other qualities of the battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a pole piece and a battery using the pole piece. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics and electric vehicles due to their advantages such as environmental friendliness, high working voltage, large specific capacity and long cycle life, to improve the fast charging ability, lifespan and safety of lithium-ion batteries. It is of great significance for the practical promotion and application of batteries. [0003] Winding battery is a commonly used type of battery. It is mainly composed of positive electrode sheets, separators, and negative electrode sheets, which are stacked and then wound to form a battery core, and then made by liquid injection, packaging, and chemical formation. However, conventional batteries The core is usually too thick near the lug of the pole piece, especially when the pole piece is designed in the middle of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/70H01M10/0525H01M50/531
CPCH01M4/13H01M4/70H01M10/0525Y02E60/10H01M4/133H01M4/134H01M4/366H01M4/405H01M2004/027H01M2004/028
Inventor 张双虎张健孙雷明
Owner ZHUHAI COSMX BATTERY CO LTD
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