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Winding type lithium ion cell and preparation method thereof

A lithium-ion, winding technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of reducing production efficiency, production instability, complicated processes, etc., to improve production efficiency and production consistency, reduce The effect of defective rate, less short-circuit and poor size

Inactive Publication Date: 2019-02-19
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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  • Winding type lithium ion cell and preparation method thereof
  • Winding type lithium ion cell and preparation method thereof
  • Winding type lithium ion cell and preparation method thereof

Examples

Experimental program
Comparison scheme
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 winding type lithium ion cell and a preparation method thereof, and belongs to the technical field of lithium ion battery. The problem of poor yield rate of existing technicalproducts is solved. The method comprises the steps that diaphragm belt unreeling is conducted on a diaphragm reel, a positive electrode reel and a positive electrode reel are unreeled in the conveying direction of the diaphragm belt and cut by a cutting mechanism to form a positive electrode single piece and a negative electrode single piece, the surface on the same side of the diaphragm is alternately provided with a positive electrode region and a negative electrode region, a corresponding electrode single piece is placed on the first region of the diaphragm belt, two corresponding electrode single pieces are placed in every subsequent positive electrode region and every subsequent negative electrode region after the first region, and the diaphragm belt on which the positive electrode single pieces and the negative electrode single pieces are placed are directly conveyed to a combining mechanism and a winding mechanism to be wound to prepare the winding type lithium ion cell. The winding type lithium ion cell is provided. The method can improve the production efficiency and the product qualification 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 Applications(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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