Rolling Cores, Batteries and Electronics

A technology of winding core and positive electrode sheet, applied in the field of lithium ion battery, can solve the problems of prone to lithium precipitation and affecting the fast charging performance of the battery, etc.

Active Publication Date: 2021-08-31
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a winding core, a battery and an electronic product to solve the problem that during the charging process of the existing winding core, the current density in the single-side area of ​​the negative electrode sheet is greater than the current density in the double-side area of ​​the negative electrode sheet, and the current density in the single-side area of ​​the negative electrode sheet is Lithium precipitation is more likely to occur during high current charging, which affects the fast charging performance of the battery

Method used

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  • Rolling Cores, Batteries and Electronics
  • Rolling Cores, Batteries and Electronics
  • Rolling Cores, Batteries and Electronics

Examples

Experimental program
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Effect test

Embodiment 1

[0054] figure 1 This is a schematic structural diagram of the winding core provided in this embodiment. Those skilled in the art can understand that the winding core 100 is a component that stores and releases electrical energy in the battery. During the charging process, lithium ions are extracted from the positive electrode sheet and embedded in the negative electrode sheet 130. During the discharging process, lithium ions are released from the negative electrode sheet 130. The intercalation and deintercalation of lithium ions are used to realize the charging and discharging of the winding core 100, thereby realizing the charging and discharging of the lithium ion battery. like figure 1 As shown, the winding core 100 provided in this embodiment includes a first positive electrode sheet 110, a negative electrode sheet 130 and a second positive electrode sheet 120 that are stacked up and down and wound together, and the head here is defined as the starting end of the polar sh...

Embodiment 2

[0081] On the basis of the first embodiment, this embodiment also provides a battery, the battery includes a casing and the winding core in the first embodiment.

[0082] In the battery provided in this embodiment, a winding core and an electrolyte are arranged inside the casing, and are communicated with an external circuit through the positive and negative terminals of the winding core, wherein the positive terminal includes a first positive terminal and a second positive terminal. The positive electrode tab is arranged on the first positive electrode sheet, the second positive electrode tab is arranged on the second positive electrode sheet, and the negative electrode tab is arranged on the negative electrode sheet. During the charging process of the battery, lithium ions are extracted from the positive electrode coating of the positive electrode sheet, and embedded in the negative electrode coating of the negative electrode sheet after passing through the separator; during ...

Embodiment 3

[0085] This embodiment provides an electronic product including a battery.

[0086] The battery in this embodiment has the same structure as the battery provided in the second embodiment, and can bring the same or similar technical effects.

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Abstract

An embodiment of the present invention provides a winding core, a battery, and an electronic product. The winding core includes: a first positive electrode sheet including a first positive electrode current collector and a first positive electrode coating, and the first positive electrode coating is coated on the first positive electrode current collector. The first surface of the second positive electrode sheet includes a second positive electrode collector and a second positive electrode coating coated on the two surfaces of the second positive electrode collector; the negative electrode sheet includes a negative electrode collector and is coated on both surfaces of the negative electrode collector Negative coating on the surface. The head of the negative electrode sheet is located between the first positive electrode sheet and the second positive electrode sheet, and the negative electrode coating on the head of the negative electrode sheet is facing the first positive electrode coating and the second positive electrode coating. The present invention also provides a battery, including a casing and the above-mentioned winding core. The present invention further provides an electronic product including the above-mentioned battery. In the winding core provided by the present invention, during the charging process, the current density of the negative electrode coating on both sides of the same position of the negative electrode current collector is the same, the negative electrode sheet is difficult to separate lithium, and the fast charging performance is improved.

Description

technical field [0001] Embodiments of the present invention relate to lithium-ion battery technology, and in particular, to a winding core, a battery, and an electronic product. Background technique [0002] With the development of science and technology, more and more electronic products have entered people's lives, and a large part of electronic products are driven by batteries. Among them, lithium-ion batteries have been widely used in electronic products in various fields because of their advantages of long service life and high energy density. [0003] At present, when manufacturing a wound lithium-ion battery, after stacking the positive electrode sheet and the negative electrode sheet together, the head of the negative electrode sheet is taken as the center, and the winding core is formed from the head to the tail. In the roll core formed in this way, the bent sections of the negative electrode sheet in the middle thereof are opposite to each other, resulting in a de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M4/13H01M50/536
CPCH01M4/13H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 余正发彭冲胡贤飞宋博李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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