Lithium ion battery lamination unit, preparation method thereof and lithium ion battery comprising lithium ion battery lamination unit

A lithium-ion battery and lamination technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor battery capacity performance, low battery production efficiency, and high alignment accuracy, and achieve the goals of reducing thermal shrinkage, high production efficiency, and improving uniformity Effect

Pending Publication Date: 2022-05-27
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first purpose of the present invention is to provide a lithium-ion battery to overcome the problems that the lamination process in the prior art is difficult to achieve high alignment accuracy, resulting in low battery production efficiency and poor battery capacity performance. The lamination unit and its preparation method and the lithium-ion battery containing the same can effectively improve the lamination precision and improve the production efficiency

Method used

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  • Lithium ion battery lamination unit, preparation method thereof and lithium ion battery comprising lithium ion battery lamination unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]A lithium-ion battery stack unit, comprising 20 positive electrode sheets and 21 negative electrode sheets arranged alternately, and a continuous separator folded in a zigzag shape for separating the positive electrode sheets and the negative electrode sheets; both sides of the stack unit are for the negative electrode. The continuous separator adopts a polyethylene separator with a thickness of 20 μm, and the two sides of the polyethylene separator are respectively coated with an electrolyte coating with a thickness of 3 μm. and 10 parts carboxymethyl cellulose.

[0033] Among them, the preparation method of lithium aluminum titanium phosphate ceramic electrolyte is as follows: LiNO 3 , Al(NO 3 ) 3 ·9H 2 O, NH 4 H 2 PO 4 and CsClO 4 Add deionized water to dissolve, then add citric acid, stir evenly, then add titanium lactate, stir at 75 ° C for 18 hours to obtain a viscous liquid; among them, LiNO 3 , Al(NO 3 ) 3 ·9H 2 O, titanium lactate and NH 4 H 2 PO ...

Embodiment 2

[0039] A lithium ion battery stack unit, comprising 20 positive electrode sheets and 21 negative electrode sheets alternately arranged and a continuous separator folded in a zigzag shape for separating the positive electrode sheets and the negative electrode sheets; both sides of the stack unit are for the negative electrode. The continuous separator adopts a polyethylene separator with a thickness of 6 μm, and the two sides of the polyethylene separator are respectively coated with an electrolyte coating with a thickness of 5 μm. and 10 parts carboxymethyl cellulose.

[0040] Among them, the preparation method of lithium aluminum titanium phosphate ceramic electrolyte is as follows: LiNO 3 , Al(NO 3 ) 3 ·9H 2 O, NH 4 H 2 PO 4 and CsClO 4 Add deionized water to dissolve, then add citric acid, stir evenly, then add titanium lactate, stir at 70 ° C for 20 h to obtain a viscous liquid; among them, LiNO 3 , Al(NO 3 ) 3 ·9H 2 O, titanium lactate and NH 4 H 2 PO 4 The...

Embodiment 3

[0046] A lithium ion battery stack unit, comprising 20 positive electrode sheets and 21 negative electrode sheets alternately arranged and a continuous separator folded in a zigzag shape for separating the positive electrode sheets and the negative electrode sheets; both sides of the stack unit are for the negative electrode. The continuous separator adopts a polyethylene separator with a thickness of 25 μm, and the two sides of the polyethylene separator are respectively coated with an electrolyte coating with a thickness of 1 μm. and 10 parts carboxymethyl cellulose.

[0047] Among them, the preparation method of lithium aluminum titanium phosphate ceramic electrolyte is as follows: LiNO 3 , Al(NO 3 ) 3 ·9H 2 O, NH 4 H 2 PO 4 and CsClO 4 Add deionized water to dissolve, then add citric acid, stir evenly, then add titanium lactate, stir at 80 ° C for 10 h to obtain a viscous liquid; among them, LiNO 3 , Al(NO 3 ) 3 ·9H 2 O, titanium lactate and NH 4 H 2 PO 4 Th...

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Abstract

The invention discloses a lithium ion battery lamination unit, a preparation method of the lithium ion battery lamination unit and a lithium ion battery comprising the lithium ion battery lamination unit. The lamination unit comprises a plurality of positive plates and negative plates which are alternately arranged, and a Z-shaped folded continuous diaphragm for separating the positive plates from the negative plates, the two sides of the continuous diaphragm are coated with electrolyte coatings, and the electrolyte coatings comprise the following components in parts by weight: 80-100 parts of a titanium aluminum lithium phosphate ceramic electrolyte and 60-80 parts of a binder. The preparation method comprises the following steps: respectively adhering a positive plate and a negative plate to corresponding positions on two sides of a continuous diaphragm coated with an electrolyte coating to obtain a plurality of groups of pole piece pairs at equal intervals; and folding the continuous diaphragm between the pole piece pairs in a Z shape to obtain the lamination unit. The two sides of the continuous diaphragm are coated with the electrolyte coatings containing the titanium aluminum lithium phosphate ceramic, so that the thermal shrinkage of the diaphragm can be reduced, and the capacity performance of the battery can be improved; the lamination unit is high in production efficiency and high in lamination quality.

Description

technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to a lithium ion battery laminated unit, a preparation method thereof, and a lithium ion battery comprising the same. Background technique [0002] Cell preparation is an important process in the lithium-ion battery manufacturing process. Traditional small-capacity lithium-ion battery cells are mainly prepared by winding, that is, the long-sheet positive and negative electrodes are wound together with the inserted separator. Treatment; this method is more efficient and the consistency of the produced battery is good, but the impedance of the battery produced by it is large, and the heat dissipation performance of the battery cell is poor, so it is not suitable for use as a power battery, which is generally used in electronic equipment. Small-capacity batteries are used more in manufacturing. [0003] Large-capacity lithium-ion power batteries are generally manufactured ...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M10/0525H01M10/0562H01M10/0583
CPCH01M10/0459H01M10/0525H01M10/0562H01M10/0583Y02P70/50Y02E60/10
Inventor王勇李凡群韩笑张厚泼
OwnerWANXIANG 123 CO LTD