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A lithium-ion battery core winding and stacking method

A lithium-ion battery and winding core technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of reducing the specific mass energy density of battery modules, and achieve specific mass energy density, reduce consumption, and roll core size Reduced effect

Active Publication Date: 2021-02-02
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

Taking 18650 lithium-ion battery as an example, its capacity is mostly 1200mAh-3400mAh, and about 7,000 18650 lithium-ion batteries are needed when used as a power supply for automobiles. Each battery has a battery case, and the existence of the battery case reduces the battery module. specific mass energy density

Method used

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  • A lithium-ion battery core winding and stacking method
  • A lithium-ion battery core winding and stacking method
  • A lithium-ion battery core winding and stacking method

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[0023]The present invention is based on the basic design idea that the winding mode of the winding core needs to be improved. At present, the winding mode at both ends of the winding core is very suitable. The two ends of the winding core of the present invention can be wound at the same time to reduce the size of a single winding core, and the increase in the number of winding cores can also reduce the current carried by each winding core during high-current discharge, thereby reducing the winding core's experience in use. damage. According to the size of the battery required, the winding diameter and length of the core, the number of cores in each layer and the number of layers stacked on the core are adjusted, and the overall size of the core is adjusted to adjust the size of the lithium ion battery.

[0024]The following is a detailed description of the designed new core winding and stacking form:

[0025]Such asfigure 1 As shown, the core before winding is a long strip with a length ...

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Abstract

The invention discloses a winding and stacking method of a lithium-ion battery winding core. The winding and stacking form is different from the internal winding and stacking form of a traditional lithium-ion battery, and the size of the battery can be controlled by changing the winding diameter of the winding core. To meet different usage requirements. The invention can improve the space utilization rate of the battery, and the parallel connection of multiple winding cores can enhance the large-current discharge capacity of the battery.

Description

Technical field[0001]The present invention relates to the field of lithium ion batteries, in particular to a method for winding and stacking lithium ion battery cores.Background technique[0002]With the intensification of the energy crisis and environmental pollution, new energy vehicles have developed rapidly, and the number of electric vehicles has soared year by year. As the main power source of electric vehicles, lithium-ion batteries are currently more stringent in terms of energy density and safety. Currently commercial lithium-ion batteries mainly include cylindrical batteries, prismatic batteries and soft-pack batteries. The electrochemical component of the battery is the battery cell. The cylindrical battery cell is wound by the positive and negative electrodes and the diaphragm. The soft-pack battery cell is formed by stacking or winding positive and negative electrodes and separators.[0003]At present, the cell structure of commercial lithium-ion batteries still needs to be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587
CPCH01M10/0587Y02E60/10Y02P70/50
Inventor 许骏袁春浩高翔王璐冰
Owner BEIHANG UNIV
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