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A kind of winding type lithium ion electric core and preparation method thereof

A lithium-ion, wound-type technology, applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of reduced production efficiency, production instability, and complicated processes, so as to improve production efficiency and production consistency, reduce The defect rate and the effect of avoiding short circuit phenomenon

Inactive Publication Date: 2020-09-15
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. In the production process, the positive and negative plates are respectively repressed with the diaphragm, then stacked and placed for use, and then transferred to the winding process for re-operation. This intermittent production mode not only has a complicated process, but also greatly reduces Production efficiency and production instability

Method used

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  • A kind of winding type lithium ion electric core and preparation method thereof
  • A kind of winding type lithium ion electric core and preparation method thereof
  • A kind of winding type lithium ion electric core and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 , 2 As shown in , 3, the preparation method of the winding type lithium ion battery comprises the following steps: select the diaphragm roll 1, and unwind the diaphragm roll 1 with the diaphragm belt 1a, so that the diaphragm belt 1a is driven by the transmission mechanism-4 to recombine Mechanism 6 transmits;

[0038] Select the positive electrode roll 2 and the negative electrode roll 3, respectively unwind the positive electrode roll 2 and the negative electrode roll 3 in the conveying direction of the diaphragm belt 1a, so that the positive electrode is conveyed to the shearing mechanism 5 under the drive of the conveying mechanism 29 , so that the negative electrode is conveyed to the shearing mechanism 5 under the drive of the conveying mechanism 3 10;

[0039] The positive electrode and the negative electrode are alternately cut into positive electrode single pieces 2a and negative electrode single pieces 3a by the cutting mechanism 5, and the ...

Embodiment 2

[0055] The technical solution in this embodiment is basically the same as the technical solution in Embodiment 1, the difference is that, as figure 2 , 4 As shown, there is a blank separator 1a2 with a second length value between the first positive electrode single sheet 2a and the first negative electrode single sheet, which is used to make the first positive electrode single sheet 2a and the first negative electrode single sheet when winding. There is a separator between the negative electrode single pieces 3a, and the tabs of the positive electrode single piece 2a and the negative electrode single piece 3a are staggered on both sides during winding. The blank separator 1a2 of the second length value can ensure that there is a separator between the first positive electrode single piece 2a and the first negative electrode single piece 3a when winding, and can also ensure that the tab phases of different polarities Staggered on both sides, there will be no short circuit caus...

Embodiment 3

[0057] The technical solution in this embodiment is basically the same as the technical solution in Embodiment 1, the difference is that, as shown in 2 and 5, the head end of the diaphragm belt 1a is left with a blank diaphragm of any length, preferably, A blank separator 1a1 with a first length value is used, and a blank separator 1a2 with a second length value is spaced between the first negative electrode single piece 3a and the first positive electrode single piece 2a. The distance between the positive electrode monolith 2a and the negative electrode monolith 3a after placing the first positive electrode monolith 2a and the first negative electrode monolith 3a is according to the thickness and width of the positive electrode monolith 2a in the winding process, The thickness and width of the negative electrode sheet 3a, the thickness of the separator, and the number of coils are gradually increased.

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Abstract

The invention provides a wound lithium ion battery cell and a preparation method thereof, belonging to the technical field of lithium ion batteries. It solves the problem of high defect rate of existing technical products. The preparation method of the wound lithium-ion battery cell comprises the following steps: unwinding the diaphragm roll with a diaphragm tape; unwinding the positive electrode roll and the negative electrode roll in the conveying direction of the diaphragm tape and cutting them by a shearing mechanism. Positive electrode monolith and negative electrode monolith; the surface of the same side of the diaphragm belt is alternately provided with positive electrode regions and negative electrode regions; a corresponding electrode monolith is placed on the first region of the diaphragm strip, and each positive electrode region and each Two corresponding electrode sheets are placed in the negative electrode area; the separator belt with the positive electrode sheet and the negative electrode sheet is directly sent to the composite mechanism and the winding mechanism for winding to prepare a wound lithium ion battery. A wound lithium-ion cell is also proposed. The invention can improve production efficiency and product qualified rate.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a wound lithium ion battery core and a preparation method thereof. Background technique [0002] In the prior art, the battery cells of power lithium batteries can be divided into two types, winding battery cells and laminated battery cells. Among them, the core part of the winding assembly is to wind the positive / negative electrode sheet and the separator on the winding needle to form a winding core, and then package the winding core. The advantage of this method is that the lithium-ion battery has high consistency and high production efficiency; the disadvantage is that the number of winding layers and the size of the pole pieces are limited. The laminated battery cell is formed by stacking the negative pole piece and the positive pole piece alternately in the separator. The advantage of this method is that the number of layers of the battery cell and the size of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0587
CPCH01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 贲晴郭恒志魏日兵赵亚吕益飞
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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