Winding electric core and its preparation method, battery and electronic product

A battery cell and barrier layer technology, applied in the field of lithium batteries, can solve problems such as safety accidents and thermal runaway of lithium ion batteries

Active Publication Date: 2021-09-07
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, lithium-ion batteries with winding cells will undergo lithium deposition during fast charging, which may lead to thermal runaway of lithium-ion batteries and cause safety accidents. Therefore, how to reduce lithium-ion battery deposition during fast charging The security risks brought by the system have become a common concern of designers

Method used

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  • Winding electric core and its preparation method, battery and electronic product
  • Winding electric core and its preparation method, battery and electronic product
  • Winding electric core and its preparation method, battery and electronic product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] figure 1 A partial structural schematic diagram of a wound cell provided in Embodiment 1 of the present invention; figure 2 A partial structural schematic diagram of a wound cell provided in Embodiment 1 of the present invention; image 3 A partial structural schematic diagram of a wound cell provided in Embodiment 1 of the present invention; Figure 4 It is a schematic diagram of a part of the structure of the wound cell provided in Embodiment 1 of the present invention.

[0044] refer to Figure 1 to Figure 4 As shown, this embodiment provides a winding battery core, which includes a positive electrode sheet 1, a negative electrode sheet 2, and an insulating diaphragm 3 between the positive electrode sheet 1 and the negative electrode sheet 2, wherein the insulating diaphragm 3 can make The positive electrode sheet 1 and the negative electrode sheet 2 of the wound cell are insulated from each other, and the insulating diaphragm 3 has pores for lithium ions to pass...

Embodiment 2

[0078] This embodiment provides a battery, which includes a casing and a wound battery core.

[0079] The wound cell in this embodiment has the same structure as the wound cell provided in Embodiment 1, and can bring about the same or similar technical effects, so we won’t repeat them one by one here. For details, please refer to the description of the above embodiment .

Embodiment 3

[0081] This embodiment provides an electronic product, and the electronic product includes a battery.

[0082] The battery in this embodiment has the same structure as the battery provided in Embodiment 2, and can bring about the same or similar technical effects, so details will not be repeated here, and details can be referred to the descriptions of the above embodiments.

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Abstract

The invention provides a wound electric core and a preparation method thereof, a battery and an electronic product. The wound electric core includes a positive electrode sheet, a negative electrode sheet, and an insulating diaphragm between the positive electrode sheet and the negative electrode sheet; the negative electrode sheet includes a negative electrode base layer, Negative electrode coating and the negative electrode tab that is arranged on the surface of the negative electrode base layer, the negative electrode coating covers the surface of the negative electrode base layer, and the negative electrode coating has a tab connection area that avoids the negative tab, and the negative tab is located in the tab connection area; the tab connection The insulating diaphragm between the positive electrode area and the positive electrode sheet is provided with a barrier layer covering the tab connection area. The barrier layer is used to prevent lithium ions from passing through, thereby preventing metal lithium from being precipitated and attached to the area near the negative tab during the fast charging process of the battery. The uncoated area is beneficial to reduce the safety risk caused by lithium precipitation during the fast charging process of lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a wound electric core, a preparation method thereof, a battery and electronic products. Background technique [0002] With the development of science and technology, more and more electronic products have entered all aspects of people's lives, and the normal use of electronic products is inseparable from batteries. Among them, lithium-ion batteries are widely used in the world due to their high energy density and environmental friendliness. Electronic products in various fields have been widely used, and with the development of electric vehicle technology, the application of lithium-ion batteries in the field of electric vehicles has also attracted much attention. [0003] As lithium-ion batteries are more and more widely used, users have higher and higher requirements on the charging speed and battery life of lithium-ion batteries. Therefore, battery fast charging tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M50/533H01M50/536H01M4/13H01M10/0525
CPCH01M10/0525H01M10/0587H01M4/13H01M50/531Y02E60/10H01M50/572H01M10/052Y02P70/50H01M50/417H01M50/449
Inventor 付小虎徐腾飞
Owner ZHUHAI COSMX BATTERY CO LTD
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