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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.

Inactive Publication Date: 2020-08-21
蜂巢能源(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, although the binding rate is relatively large, it is difficult for the winding core to enter the casing, or even cannot enter the casing.
In order to solve the problem of winding cores entering the case, some manufacturers can only reduce the pressing rate to ensure the stability of production. This method not only cannot fully utilize the space in the case, but also reduces the energy density of the battery.

Method used

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  • Manufacture method of winding core and winding core
  • Manufacture method of winding core and winding core
  • Manufacture method of winding core and winding core

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Embodiment Construction

[0027] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

[0028] The winding core 10 in the embodiment of the present invention is suitable for cylindrical batteries, including but not limited to ternary batteries, lithium iron phosphate and other lithium ion batteries, such as 18650, 21700 and 26650 cylindrical batteries. The battery includes a winding core 10 and a positive electrode tab 30 and a negative electrode tab 40 connected to the winding core 10 . figure 1 , ima...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M10/04H01M10/0525
CPCH01M10/0422H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 杨威吴军
Owner 蜂巢能源(武汉)有限公司
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