Manufacture method of winding core and winding core

A manufacturing method and core technology, which can be used in final product manufacturing, secondary battery manufacturing, sustainable manufacturing/processing, etc., and can solve the problems of reducing battery energy density, incapable of fully utilizing the shell space, and difficulty in entering the core into the shell, etc.
CN109524723BInactive Publication Date: 2020-08-21蜂巢能源(武汉)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
蜂巢能源(武汉)有限公司
Publication Date
2020-08-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a manufacturing method of a winding core and the winding core. In the manufacturing method of the winding core, the position of the negative electrode lug on the negative electrode sheet is adjusted until the negative electrode lug is aligned with the negative pole piece after winding. The included angle of the first direction of the above-mentioned winding frame is 15-165°, which avoids the superposition of the negative electrode lug in the long axis direction of the winding core, and can reduce the diameter of the winding core under the premise of ensuring the tightness rate, so that the winding core can be smoothly into the shell.
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Description

technical field

[0001] The invention relates to the technical field of cylindrical batteries, in particular to a manufacturing method of a winding core and the winding core. Background technique

[0002] At present, the market has higher and higher requirements for the energy density of lithium-ion batteries, especially the automotive power battery market. For cylindrical lithium-ion batteries, due to the small volume of the current mainstream model (18650 / 21700 / 26650) single winding core, the single winding core includes a cylindrical shell and a winding core inside the shell, and the cylindrical shell is generally made of steel . To increase the energy density requires a more adequate use of the space inside the cylindrical enclosure. The winding core is used as the source of the capacity of the cylindrical battery. Generally, the energy density of the battery is related to the tightness rate. Under the premise that the space in the shell is fully utilized, the greater t...

Claims

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