Lamination structure of lithium ion battery, preparation of lamination structure, battery cell, preparation of battery cell and application of battery cell

A technology of lithium-ion battery and laminated structure, which is applied in the manufacture of electrolyte batteries, equipment for manufacturing primary batteries, primary batteries, etc. It can solve the problems of low yield rate of batteries, low production efficiency of batteries, and high folding frequency. Productivity and the effect of shortening lamination time

Pending Publication Date: 2022-05-27
BATTERO TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The folding frequency of the Z-type lamination process is high, the separation film and the positive and negative electrodes are easily misaligned, and the yield rate of the battery cell is low; the composite lamination requires multiple single composite units to be stacked, and the production efficiency of the battery cell is relatively low.

Method used

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  • Lamination structure of lithium ion battery, preparation of lamination structure, battery cell, preparation of battery cell and application of battery cell
  • Lamination structure of lithium ion battery, preparation of lamination structure, battery cell, preparation of battery cell and application of battery cell
  • Lamination structure of lithium ion battery, preparation of lamination structure, battery cell, preparation of battery cell and application of battery cell

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preparation example Construction

[0028] The invention provides a preparation method of a lithium ion battery laminated structure, comprising the following steps:

[0029] (1) cutting the composite pole piece band A consisting of the positive pole piece, the negative pole piece and the separator to obtain a single composite pole piece unit A;

[0030] (2) cutting the composite pole piece band B composed of the positive pole piece, the negative pole piece and the separator to obtain a single composite pole piece unit B;

[0031] (3) place the single composite pole piece unit B obtained in step (2) on the upper layer of the single composite pole piece unit A obtained in step (1), and repeat the stacking several times to obtain the composite pole piece unit C;

[0032] (4) A layer of separator is placed on the uppermost positive electrode of the composite electrode C, and then a negative electrode is placed to obtain a lithium ion battery laminated structure.

[0033] In an embodiment of the present invention, i...

Embodiment 1

[0045] This embodiment provides a battery cell of a lithium ion battery.

[0046] like Figure 1-5 As shown, the composite pole piece belt A1 is composed of a layer of positive pole pieces 12, two layers of negative pole pieces 11 and three layers of parallel isolation films 13, and a layer of equidistant negative pole pieces 11 is placed on the bottommost isolation film 13, After that, a layer of separator 13 is placed on the negative pole piece 11, and then a layer of positive pole pieces 12 with equal spacing is placed on the layer of separator 13. The positive pole piece 12 is aligned with the center of the lower negative pole piece 13, and then the A layer of separator 13 is placed on the positive pole piece 12 , and a layer of equally spaced negative pole pieces 11 is placed on the layer of separator 13 , and the negative pole piece 11 is aligned with the center of the lower positive pole piece 12 .

[0047] The composite pole piece belt B2 is composed of one layer of n...

Embodiment 2

[0054] This embodiment provides a lithium-ion battery, including the above-mentioned battery cell.

[0055] On the basis of the lithium ion battery cells prepared in Example 1, welding tabs, top sealing, side sealing operations, liquid injection and pre-sealing were performed, and finally the operations of standing still for aging, hot and cold pressing, formation and secondary sealing were performed, Get a lithium-ion battery.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery lamination structure and preparation thereof, a battery cell and preparation and application of the battery cell. The preparation method comprises the following steps: cutting a composite pole piece belt A and a composite pole piece belt B consisting of a positive pole piece, a negative pole piece and an isolating membrane to obtain a single composite pole piece unit A and a single composite pole piece unit B; then putting the single composite pole piece unit B on the upper layer of the single composite pole piece unit A, and repeatedly stacking for a plurality of times to obtain a composite pole piece unit C; and finally, placing a layer of isolating membrane on the positive pole piece on the uppermost layer of the composite pole piece C, and then placing a negative pole piece to obtain the lithium ion battery lamination structure. Subsequently, winding along a lithium ion battery lamination structure by utilizing an isolating membrane, and carrying out post-treatment to form a battery cell; and further preparing the lithium ion battery by utilizing the battery cell. Compared with the prior art, the production efficiency of the lithium ion battery lamination is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a laminated structure of lithium ion batteries and preparation thereof, electric cores and preparation and application thereof. Background technique [0002] The manufacturing process of lithium-ion batteries in the early stage includes pulping, coating, rolling, die-cutting, slitting, and then to make batteries. There are usually two methods, namely winding and lamination. Winding is to roll the die-cut positive and negative pole pieces and separators on the core to a fixed length, and then use a rolling needle to take out the wound cell to form a cell; lamination refers to the die-cut And the cut positive and negative pole pieces are alternately stacked on the separator, and finally a square cell is formed. [0003] There are also two methods of lamination, one is Z-type lamination, that is, the positive and negative pole pieces are alternately stacked on the sep...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M6/00H01M6/14
CPCH01M10/058H01M10/0525H01M6/005H01M6/14Y02P70/50
Inventor 肖礼军吴记彪张珂张五堂
Owner BATTERO TECH CORP LTD
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