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A kind of rolling needle and using method thereof

A technology of rolling pins and needles, which is applied in the direction of electrochemical generators, electrical components, climate sustainability, etc., can solve the problems of lower yield, lower battery performance, battery polarization, etc., to improve yield and reliability rate, long cycle life, and the effect of large rate discharge

Active Publication Date: 2018-08-21
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the needle is pulled out, it needs to be bounced for a certain gap before it can be pulled out smoothly, which has a certain impact on the tightness of the winding core.
Because the surface of the winding needle is tightly pressed against the winding core, it will be difficult to pull the winding needle out from the middle of the winding core, and may even bring out the inner diaphragm of the winding core, destroying the winding core, and causing the winding core to be scrapped
If the winding core is loose inside and outside tight, the battery is prone to breakage of the pole pieces during the working process, reducing the yield
The cavity formed after the winding core is pulled out will easily cause the internal structure of the battery to collapse during the working process and cause the battery to polarize, reducing the performance of the battery
Especially in the manufacture of wound batteries with hollow structures, the shortcomings of the current winding needles are more obvious

Method used

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  • A kind of rolling needle and using method thereof
  • A kind of rolling needle and using method thereof

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Embodiment Construction

[0026] The needle roller of the present invention will be further described in detail below in conjunction with specific embodiments and accompanying drawings.

[0027] The rolling pins of the present invention are used in the preparation of winding cores. Such as figure 1 and figure 2 As shown, in a preferred embodiment, the rolling needle of the present invention includes a needle body, an inflatable and deflatable air bag and a needle body fixing part. One end of the needle body is connected with the needle body fixing part. An accommodating cavity is opened in the middle of the needle body. The air bag is sheathed in the accommodating cavity of the needle body. When the air bag is full of air, the outer surface of the air bag presses against the inner wall of the accommodating chamber. A plurality of protrusions are formed on the outer surface of the airbag. The surface of the protrusion is rough, or at least the side of the protrusion facing away from the airbag is...

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Abstract

The invention relates to a rolling needle, comprising a needle body and an air bag; the air bag is sheathed in the needle body; a plurality of rough raised parts are formed on the outer surface of the air bag; through hole. The object of the present invention is to provide a winding needle with a simple structure and an ingenious structure. The winding needle is easy to operate, and is conducive to the preparation of a battery cell with a compact structure, a high volumetric energy density, and is not easy to break.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a winding needle and a method for using the same. Background technique [0002] In the lithium battery manufacturing process, the battery cell is usually tightly wound together with the battery positive pole piece, negative pole piece, and separator through winding equipment. Density enables batteries to carry more energy in a limited space. At present, with the development of battery technology, vehicle power supplies, electric vehicles, etc. have higher requirements for high volumetric energy density of batteries. Among the components of the winding equipment, the design of the winding needle and the winding method have a great influence on the performance of the produced battery core. [0003] In the existing winding equipment, usually two winding needles are used, and the positive electrode sheet, the separator, and the negative electrode sheet are clamped betwe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/04H01M10/0587H01M10/052
CPCH01M10/0409H01M10/052H01M10/0587Y02E60/10Y02P70/50
Inventor 李鹏辉张智建葛辉明吕正中刘金成
Owner EVE ENERGY CO LTD
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