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Lithium battery core and manufacturing method thereof

A manufacturing method and technology for lithium batteries, which are applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as easy deflection and easy movement of positive and negative electrode sheets, so as to ensure energy density and simplify production. Process, the effect of improving the pass rate of lamination

Pending Publication Date: 2021-10-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is: how to solve the problem that the positive and negative pole pieces are easy to move and deflect in the prior art using laminated batteries

Method used

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  • Lithium battery core and manufacturing method thereof
  • Lithium battery core and manufacturing method thereof
  • Lithium battery core and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as Figure 18 As shown, the lithium battery cell includes a positive electrode sheet 50, a negative electrode sheet 60, and a diaphragm; in this embodiment, it includes four diaphragms, which are respectively the first diaphragm 10, the second diaphragm 20, the third diaphragm 30, and the fourth diaphragm 40 , but not limited to the number of diaphragms, which can be selected according to actual needs.

[0068] Such as figure 2 , Figure 16 As shown, the positive electrode sheet 50 includes a positive electrode current collector 51 and a positive electrode active material 52. The positive electrode current collector includes a plurality of spaced parallel first small pieces, and the adjacent first small pieces are connected by a bent blank area, and the blank space The region is strip-shaped, and the positive electrode active material is coated on the side of the first small piece; the number of the separator is the same as the number of the first small piece, s...

Embodiment 2

[0074] This embodiment discloses a manufacturing method for manufacturing lithium battery cells in the first embodiment above, including the following steps:

[0075] Step S01: interspersed;

[0076] Such as figure 1 As shown, in the present embodiment, four diaphragms are included, the first diaphragm 10, the second diaphragm 20, the third diaphragm 30, and the fourth diaphragm 40, and the four diaphragms are arranged at intervals in parallel; wherein the first diaphragm 10 and the second diaphragm The distance between the diaphragms 20, the third diaphragm 30 and the fourth diaphragm 40 is N, the distance between the second diaphragm 20 and the third diaphragm 30 is M, and N Figure 21 );

[0077] In this embodiment, three positive electrode sheets 50 and three negative electrode sheets 60 are included, and the three positive electrode sheets 50 and three negative electrode sheets 60 are sequentially connected to the first diaphragm 10, the second diaphragm 20, and the third...

Embodiment 3

[0102] In this embodiment, in the step S01, the separator is connected to the positive electrode sheet 50 and the negative electrode sheet 60. After the positive electrode sheet 50 and the negative electrode sheet 60 are stacked on the separator, the positive electrode sheet 50 and the negative electrode sheet 60 are bonded together by hot pressing. bonded to the diaphragm.

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Abstract

The invention discloses a lithium battery core and a manufacturing method. The lithium battery core comprises at least one positive electrode sheet, at least one negative electrode sheet and at least one diaphragm, wherein the positive electrode sheet comprises a positive current collector and a positive electrode active material, the positive current collector comprises a plurality of first small sheets which are parallel at intervals, the adjacent first small sheets are connected by bent blank areas, the positive electrode active material is coated on the side surface of the first small sheet, the negative electrode sheet comprises a negative current collector and a negative electrode active material, the negative current collector comprises a plurality of second small sheets which are parallel at intervals, the adjacent second small sheets are connected by bent blank areas, the diaphragm is bent in an S shape, and the first small sheets and the second small sheets are sequentially and alternately connected to the space formed after the diaphragms are bent and between the adjacent diaphragms, and are connected with the diaphragms. The manufacturing method comprises the steps of inserting, folding and combining. According to the invention, the electrode sheets are fixed, the short-circuit risk of the battery core is reduced, the production efficiency is improved, the lamination qualification rate can be effectively improved, and the production process is effectively simplified.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery cell and a manufacturing method. Background technique [0002] At present, the manufacturing process of traditional lithium battery laminated cells is as follows: ① Coating the positive active material on the aluminum foil (positive current collector), and coating the negative active material on the copper foil (negative current collector); The material is baked, rolled, and cut to obtain the positive and negative strips respectively; ③ cutting the parts of the above-mentioned aluminum and copper foils that are not coated with the active material to obtain the positive and negative tabs respectively; ④ cutting the above-mentioned positive and negative strips, Obtain the positive and negative pole pieces respectively, and insert the positive and negative pole pieces into the "Z"-shaped folded diaphragm at intervals to obtain laminated batteries; Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0583H01M4/13H01M4/139H01M10/0525H01M50/46
CPCH01M10/0525H01M10/0583H01M4/13H01M4/139H01M50/46Y02P70/50Y02E60/10
Inventor 高冲程辉吴德
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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