Preparation method of anti-falling lithium ion battery

A lithium-ion battery, anti-drop technology, applied in the direction of electrode manufacturing, secondary batteries, circuits, etc., can solve the problems of increasing scrap cost, difficulty in meeting requirements, and low coating efficiency, so as to reduce scrap cost and realize large-area coating effect of coating and improving coating efficiency

Pending Publication Date: 2020-10-16
惠州锂威新能源科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Among them, the formation of glue or adhesive film is generally carried out before the top and side sealing of the bare cells, and only one bare cell can be coated during coating, and the coating efficiency is low. Even i

Method used

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  • Preparation method of anti-falling lithium ion battery
  • Preparation method of anti-falling lithium ion battery
  • Preparation method of anti-falling lithium ion battery

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[0030] The present invention will be described in further detail below with reference to the specific embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0031] refer to Figures 1 to 5 , in an embodiment of the preparation method of the anti-drop lithium ion battery according to the present invention, it comprises the following steps:

[0032] 1) preparing anode slurry, coating it on anode current collector, cold pressing and striping to form anode electrode sheet;

[0033] 2) Prepare the cathode slurry, coat it on the cathode current collector 1, reserve an empty foil area at the tail of the cathode current collector 1 in the winding direction, set an adhesive layer 4 in the empty foil area, and cold-press, Slitting to form a cathode pole piece; wherein, the order of the two steps of the setting of the adhesive layer 4 and the cold pressing can be exchanged;

[0034] 3) The anode pole piece, the diaphragm and t...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of an anti-falling lithium ion battery. The method comprises the following steps: preparing anode slurry, coating an anode current collector with the anode slurry, and carrying out cold pressing and slitting to form an anode pole piece; preparing cathode slurry, coating a cathodecurrent collector with the cathode slurry, reserving an empty foil area at the tail part of the cathode current collector in the winding direction, arranging an adhesive layer in the empty foil area,and carrying out cold pressing and slitting to form a cathode pole piece; sequentially superposing and winding an anode pole piece, a diaphragm and a cathode pole piece to form a bare battery cell, wherein an adhesive layer area of the cathode current collector is positioned on the outermost ring of the bare battery cell, and an adhesive layer is positioned on the outward surface; and packaging and hot-pressing formation are carried out on the bare cell by using an aluminum-plastic film, so the aluminum-plastic film and the adhesive layer are bonded together. Compared with the prior art, themethod is high in efficiency, material waste is reduced, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method of a drop-resistant lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in mobile phones, laptops, power banks and other devices due to their advantages such as high energy density, long cycle life, no memory, and low pollution. Lithium-ion batteries have problems of fire and explosion caused by accidental drops during use. Therefore, the anti-drop performance of lithium-ion batteries is a very core indicator for evaluating the safety performance of lithium-ion batteries. [0003] The drop resistance performance of lithium-ion batteries is mainly determined by the adhesion between the bare cell and the aluminum-plastic film. If the adhesion between the bare cell and the aluminum-plastic film is not good, when the battery is subjected to horizontal or vertical force, the bare cell will The relativ...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M4/04H01M10/0525
CPCH01M4/0404H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 林国罗洪春林张旭纪荣进李聪郑明清陈杰李载波杨山
Owner 惠州锂威新能源科技有限公司
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