Winding needle

A technology of rolling needles and needle holders, which is applied in the direction of sustainable manufacturing/processing, electrochemical generators, electrical components, etc., can solve the problems of "S-shaped" deformation of batteries, achieve improved S-shaped deformation, and improve long-term cycle Performance and use of safe, easy-to-achieve effects

Pending Publication Date: 2020-09-01
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a winding needle that solves the winding deformation of lithium-ion batteries, aiming to solve the "S-shaped" deformation of the

Method used

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Embodiment Construction

[0026] In order to present the purpose and technical solution of the present invention more clearly to everyone, the following description will further describe the technology of the present invention in detail in conjunction with the accompanying drawings and specific implementation methods.

[0027] figure 1 , 2 , 3, 4, and 5, the present invention includes an outer cover 1 and a needle roll cover, the needle roll cover is divided into a needle roll cover main body 2 and a needle roll cover auxiliary body 3, and the inside of the needle cover main body 2 is provided with an outer needle seat, a needle clamp , the above constitutes the main structure of the rolling needle. The needle cover main body 2 is additionally provided with a pin connecting rod 4, and the needle cover auxiliary body 3 is provided with a latch 5, an upper magnet 6, and the latch 5, an upper magnet 6 and the pin connecting rod 4 set in the needle cover main body 2 , Lower magnet 7 constitutes interlock...

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Abstract

A winding needle comprises an outer cover and two oppositely-arranged winding needle outer sleeve main bodies, a base material clamping space is formed between the two winding needle outer sleeve mainbodies, and each winding needle outer sleeve main body comprises a needle base groove. An outer needle seat and a clamping needle are arranged in the needle seat groove, the groove bottom of the needle seat groove extends outwards to form a forming part with a gradually reduced sectional area, and a telescopic winding needle outer sleeve auxiliary body is installed on the forming part through anadjusting assembly. Two or more plug pins are installed on the winding needle outer sleeve auxiliary body, the lower ends of the plug pins extend into plug pin holes of the forming part, and plug pinconnecting rod bodies are installed in the plug pin connecting rod holes. First inclined faces are arranged at the bottoms of the plug pins, second inclined faces corresponding to the first inclined faces are arranged on the plug pin connecting rod bodies, and a magnetic attraction piece is arranged between the winding needle outer sleeve auxiliary body and the forming part. In the winding processof the battery cell, the internal interlayer space of a winding core is increased by dynamically adjusting the overall appearance perimeter of the winding needle, so that the problem of S-shaped deformation of the battery cell caused by the tension shrinkage and pole piece expansion of a pole piece and an isolating membrane in the winding process of the battery cell can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a winding needle. Background technique [0002] With the development of the electric vehicle market, the demand for batteries is increasing and the demand for capacity is increasing. Therefore, the battery cells have become thicker and thicker. Most lithium-ion batteries for electric vehicles still use a wound structure, and the problem of "S-shaped" deformation often occurs in the wound structure, especially when the thickness of the winding core is getting thicker and thicker. There are mainly two reasons for this kind of phenomenon: 1) winding process reason: in the winding process, it is necessary to apply a certain pulling force to the positive electrode sheet, negative electrode sheet, and separator in the direction of tape travel to ensure that the positive electrode sheet, negative electrode sheet, The degree of alignment between the separators to ensure th...

Claims

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Application Information

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IPC IPC(8): H01M10/0587
CPCH01M10/0587Y02E60/10Y02P70/50
Inventor 吴韬张应马可陈念刘勇张宝华
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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