Lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as difficulty in rehydration and hidden dangers, avoid increasing the decay rate, improve cycle life, and improve safety performance Effect

Pending Publication Date: 2022-08-05
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium-ion battery to simultaneously solve the problems of difficulty in rehydration and potential safety hazards in the prior art

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0049] In the gap between the winding core 2 and the inner wall of the casing 1, the storage liquid 3 is not filled, such as figure 1 shown. The cell failed the UN38.3 vibration test, and the capacity retention rate was only 80% after 600 cycles at 55°C.

Embodiment 2

[0051] The gap between the winding core 2 and the inner wall of the casing 1 is filled with a liquid storage 3 with a plurality of rectangular storage bags 32. The unfolded state of the liquid storage 3 is as follows: image 3 shown. The cell can pass the UN38.3 vibration test, and the capacity retention rate is 90.5% after 600 cycles at 55°C.

Embodiment 3

[0053] The gap between the winding core 2 and the inner wall of the casing 1 is filled with liquid storage 3 with a plurality of triangular storage bags 32 in a circle. The unfolded state of the liquid storage 3 is as follows: Image 6 shown. The cell can pass the UN38.3 vibration test, and the capacity retention rate is 89.4% after 600 cycles at 55°C.

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Abstract

The invention relates to the technical field of batteries, and discloses a lithium ion battery which comprises a roll core, a shell, an electrolyte and a liquid storage body, the roll core is arranged in the shell, and the liquid storage body is arranged between the roll core and the shell; at least part of the electrolyte is contained in the liquid storage body, and the liquid storage body can deform under the expansion extrusion action of the roll core so that the electrolyte can be extruded out of the liquid storage body. According to the embodiment of the invention, in the early stage of battery circulation, the electrolyte in the liquid storage body does not flow out, so that the situation that the degradation rate of the battery is increased due to the fact that the roll core is in excessive electrolyte can be effectively avoided; and in the later cycle period of the battery, the roll core gradually expands to extrude the liquid storage body, so that the electrolyte in the liquid storage body flows out, automatic liquid supplementing of the battery is realized, and the cycle life of the battery is effectively prolonged. And on the other hand, the liquid storage body in which the electrolyte is stored is arranged in the gap between the roll core and the shell, and the gap is filled, so that the roll core is fixed, and the safety performance of the battery can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery. Background technique [0002] During the continuous charging and discharging process of the existing lithium-ion battery, the electrolyte is gradually consumed, resulting in a gradual decrease in the capacity retention rate of the battery; when the free electrolyte is about to be completely consumed, the battery will dive, resulting in the cycle life of the battery. significantly shortened. [0003] However, when the initial amount of liquid injection is too large during the battery manufacturing process, the excess residual electrolyte fills the gap between the winding core and the steel shell, and the winding core is in excess electrolyte, which will lead to a significant increase in the decay rate of the battery. This is caused by excessive additives in the electrolyte, and excessive film-forming additives will continuously consume the active Li compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M50/682
CPCH01M10/0587H01M10/0525H01M10/0422H01M50/682Y02P70/50Y02E60/10
Inventor 吴仪娜李红娜赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH
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