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High-hardness flexible-packaging lithium ion battery pole piece and roll core manufacturing method

A lithium-ion battery and flexible packaging technology, applied in non-aqueous electrolyte battery electrodes, secondary batteries, battery pack components, etc., can solve the problem of shortened standby time and service life, large-scale lithium deposition in batteries, and uneven cell structure and other problems to achieve the effect of improving user experience, improving energy density, and improving cycle life

Active Publication Date: 2019-05-31
山东聚信新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, soft-pack batteries are the mainstream in the market, but because the soft-pack batteries are made of aluminum-plastic film, and the tabs are the thickest part of the finished battery due to the addition of positive and negative tabs that are much thicker than the thickness of the tape, resulting in The structure of the battery cell is not smooth, and the hardness of the finished battery as a whole or in some areas is poor, resulting in poor electrical performance, shortened standby time and service life, etc. In serious cases, there may even be a large area of ​​lithium deposited inside the battery, resulting in fire, explosion, etc. Security risks

Method used

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  • High-hardness flexible-packaging lithium ion battery pole piece and roll core manufacturing method
  • High-hardness flexible-packaging lithium ion battery pole piece and roll core manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as Figure 1-2 As shown, a high-hardness soft-packaged lithium-ion battery pole piece includes a positive pole piece and a negative pole piece. The positive electrode active material is added with conductive agent, binder and other auxiliary materials. In order to effectively use the space of the finished battery and increase the safety of the finished battery, the positive electrode sheet is provided with an uncoated blank area, and the blank area can be used for tab welding and other operations. , generally the positive plate has 2-4 blank areas;

[0022] The positive tab of the pole piece is an aluminum tab or a protruding area is provided on the current collector as the tab. The surface of the welding tab and the surface of the opposite side are affixed with a safety tape. The design requirements for the width of the safety tape are: It can overlap with the width direction of the coating line tape to the greatest extent, and does not overlap with the negative ...

Embodiment 2

[0028] Such as Figure 1-2 As shown, a high-hardness soft-pack lithium-ion battery pole piece includes a positive pole piece and a negative pole piece, and the positive pole piece is provided with a coated area and an uncoated blank area, and the coated area and the uncoated blank area A protective tape is pasted at the junction, and a safety tape is pasted on the surface of the welding tab of the positive electrode sheet and the surface of the opposite side;

[0029] The negative electrode sheet is provided with a coated area and an uncoated blank area, and a safety tape is pasted on the surface of the welding tab of the negative electrode sheet and the surface of the opposite side; the lower blank area of ​​the negative electrode sheet is pasted with a balance adhesive tape.

[0030] Preferably, the positive tab of the pole piece is an aluminum tab or a protruding area is provided on the current collector as a tab; the negative tab of the pole piece is an aluminum tab or a ...

Embodiment 3

[0038] A method for preparing a high-hardness soft-packaged lithium-ion battery core. The positive and negative pole pieces and the diaphragm are wound into a core by manual winding, semi-automatic or automatic winding. The positive and negative pole pieces are separated by a diaphragm. The end of the core is designed to be located in the middle area of ​​the tab (not overlapping with the positive and negative tabs), and terminated with a termination tape. After the core is wound, it goes through the process of shelling, assembling, baking to remove water, liquid injection, packaging, etc., and then undergoes high-temperature pressurized formation. The uncharged semi-finished battery is given a certain pressure by baking fixture or high-temperature pressurized formation cabinet. The temperature realizes charging activation and product finalization.

[0039] Preferably, the diaphragm is a ceramic plus PVDF adhesive coating diaphragm, which can aggregate the pole pieces and the ...

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Abstract

The invention relates to the lithium battery production field and especially relates to a high-hardness flexible-packaging lithium ion battery pole piece and roll core manufacturing method. Through directionally designing the pole piece of a battery and a roll core structure, multiple overlapping of an adhesive tape is realized through a rubberizing mode, and an area around a thickest pole ear ofthe roll core is thickened so as to realize the thickness uniformity of an entire finished battery, reduce a risk of anode and cathode contact short-circuit and improve safety performance. Through using a viscous diaphragm, the pole piece and the diaphragm are further bonded together, and a whole battery cell is integrated through a high-temperature pressurization mode so that the hardness of thefinished battery is greatly increased.

Description

technical field [0001] The application relates to the field of lithium battery production, in particular to a method for preparing pole pieces and winding cores of high-hardness flexible packaging lithium-ion batteries. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. At present, soft-pack batteries are the mainstream in the market, but because the soft-pack batteries are made of aluminum-plastic film, and the tabs are the thickest part of the finished battery due to the addition of positive and negative tabs that are much thicker than the thickness of the tape, resulting in The structure of the battery cell is not smooth, and the hardness of the finished battery as a whole or in some areas is poor, resulting in poor electrical performance, shortened standby time and service life, etc. In serious cases, there may even be a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M2/16H01M4/13H01M10/0525H01M10/0587
CPCY02P70/50
Inventor 周朕良黄磊张妍王艳飞郭大利何震李田田刘玉涛王克飞曲鹏利刘通李佳杨飞雪史文龙
Owner 山东聚信新能源科技有限公司
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