Tab, pole piece and lithium ion battery

A technology of lithium-ion batteries and tabs, which is applied to secondary batteries, battery pack components, non-aqueous electrolyte battery electrodes, etc., can solve the problems of unsatisfactory cell surface flatness, etc., and achieve uneven internal stress and improved The effect of poor bonding, flatness and energy

Pending Publication Date: 2021-06-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a tab, a pole piece and a lithium-ion battery, which is used to at least solve the technical problem of the unsatisfactory flatness of the surface of the cell caused by the structure of the tab when the existing pole piece is processed into a lithium-ion battery

Method used

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  • Tab, pole piece and lithium ion battery
  • Tab, pole piece and lithium ion battery
  • Tab, pole piece and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] refer to Figure 15 As shown, when the tab 300 on the negative electrode sheet 420 and the tab 300 on the positive electrode sheet 430 are both located in the inner ring layer of the battery cell 400:

[0115] Along the width direction of the first section 310, the side of the first section 310 close to the active material layer 120 is a limiting surface 311, and the side surface of the active material layer 120 close to the limiting surface 311 and the limiting surface 311 The distance is pitch H2. The distance H2 is greater than twice the thickness h of the first segment 310, and the difference between the distance H2 and twice the thickness h of the first segment 310 is δ1, and the value range of δ1 is: 2mm≤δ1≤10mm.

[0116] The inner width L2 of the cell 400 is the width of the inner ring layer of the cell 400 in the orthographic projection direction, and the width D of the tab 300 on the negative electrode sheet 420 and the tab 300 on the positive electrode sheet ...

Embodiment 2

[0124] refer to Figure 16 As shown, when the tab 300 on the negative electrode sheet 420 is located on the inner ring layer of the cell 400, and the tab 300 on the positive electrode sheet 430 is located on the outer ring layer of the cell 400:

[0125] For the tab 300 on the negative electrode sheet 420:

[0126] Along the width direction of the first section 310, the side of the first section 310 close to the active material layer 120 is a limiting surface 311, and the side surface of the active material layer 120 close to the limiting surface 311 and the limiting surface 311 The distance is pitch H2. The distance H2 is greater than twice the thickness h of the first segment 310, and the difference between the distance H2 and twice the thickness h of the first segment 310 is δ1, and the value range of δ1 is: 2mm≤δ1≤10mm.

[0127] The inner width L2 of the battery cell 400 is the width of the inner ring layer of the battery cell 400 in the orthographic projection direction...

Embodiment 3

[0138] refer to Figure 17 As shown, when the tab 300 on the positive electrode sheet 430 is located on the inner ring layer of the cell 400, and the tab 300 on the negative electrode sheet 420 is located on the outer ring layer of the cell 400:

[0139] For the tab 300 on the positive electrode sheet 430:

[0140] Along the width direction of the first section 310, the side of the first section 310 close to the active material layer 120 is a limiting surface 311, and the side surface of the active material layer 120 close to the limiting surface 311 and the limiting surface 311 The distance is pitch H2. The distance H2 is greater than twice the thickness h of the first segment 310, and the difference between the distance H2 and twice the thickness h of the first segment 310 is δ1, and the value range of δ1 is: 2mm≤δ1≤10mm.

[0141] The inner width L2 of the battery cell 400 is the width of the inner ring layer of the battery cell 400 in the orthographic projection direction...

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Abstract

The invention provides a tab, a pole piece and a lithium ion battery. The pole piece provided by the invention comprises a current collector, active substance layers and a tab, the active substance layers are arranged on the front and back surfaces of the current collector and / or one of the front and back surfaces of the current collector, at least one end of the current collector in the length direction is provided with an empty foil area without the active material layer, the tab is arranged on the empty foil area at one end of the current collector in the length direction, the tab comprises a first section and a second section connected with the first section, and two sides of the top surface of the first section are respectively provided with a concave part which is sunken downwards. The invention provides a tab, a pole piece and a lithium ion battery, which are used for at least solving the technical problem that the flatness of the surface of a battery cell processed by the pole piece is not ideal due to a tab structure when the pole piece is processed into the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a tab, a pole piece and a lithium ion battery. Background technique [0002] At present, with the country's strong support for new energy, lithium-ion batteries have developed rapidly as a green and environmentally friendly new energy source, and have been widely used in digital products, electric vehicles, and military products. The charging capacity and charge-discharge rate put forward higher requirements, and fast-charge lithium batteries are also the development trend of consumer lithium-ion batteries. [0003] Formation is an extremely important process in the manufacturing process of lithium-ion batteries. It is an important link to ensure battery life. Formation plays a vital role in battery performance. Whether the pressure on the lithium-ion battery is uniform during the formation process affects the interface bonding performance of the lithium-ion battery. When ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/536H01M4/13H01M10/0525H01M10/0587
CPCH01M4/13H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 张保海彭冲李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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