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Power battery and preparation method thereof

A power battery and rolling core technology, which is applied in the field of power batteries and their preparation, can solve the problems of battery energy density, battery cycle life, etc., and achieve the effects of increasing energy density, improving cycle life, and increasing size

Pending Publication Date: 2020-02-21
湖南领湃科技股份有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] This application aims to solve the technical problem of battery energy density and battery cycle life reduction caused by bending tabs

Method used

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  • Power battery and preparation method thereof
  • Power battery and preparation method thereof
  • Power battery and preparation method thereof

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preparation example Construction

[0058] The present application also discloses a method for preparing a power battery, which includes the following steps: Step S200, preparing a single winding core; step S300, assembling the single winding core to the casing of the power battery; step S400, providing a cover plate ; Step S500, passing the positive tab of the winding core and the negative tab of the winding core through the first through-type guide groove and the second through-type guide groove respectively; Step S600, into the casing of the power battery Inject electrolyte; step S700, assembling the cover plate to form the power battery. Compared with the traditional technical solution, the power battery prepared by the invention and its preparation method has higher energy density, smaller internal resistance, lower temperature rise and longer cycle life.

[0059] Figure 8 It is a schematic structural diagram of a power battery 100 according to an embodiment of the present application.

[0060] Referring...

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Abstract

The invention provides a power battery and a preparation method thereof. The power battery includes a casing body including a first accommodation cavity, a cover plate including a first through guidegroove and a second through guide groove, and a single roll core which includes a roll core body, a roll core positive tab and a roll core negative tab. On the one hand, only one roll core, namely thesingle roll core, is arranged in the casing body of the power battery provided by the invention, which avoids the need to fold the tabs when multiple roll cores are connected in parallel in the existing multi-roll core design, and improves the energy density and cycle life of power battery. On the other hand, the roll core positive tab and the roll core negative tab of the power battery providedby the invention pass through the first through guide groove and the second through guide groove on the cover plate after being pre-welded, and are arranged outside the casing body. The original spaceinside the casing body for accommodating the roll core positive tab and the roll core negative tab can be used to increase the size of the roll core body, maximizing the use of the internal space ofthe casing body, and further improving the energy density of the power battery.

Description

technical field [0001] The present application relates to the field of battery equipment, in particular to a power battery and a preparation method thereof. Background technique [0002] In recent years, as an environmentally friendly means of transportation, electric vehicles are being invested in the development of electric vehicles by countries all over the world, and the governments of various countries are also vigorously popularizing the use of electric vehicles. Lithium-ion power battery is an important part of electric vehicles, and its development is bound to play a key role in the performance of electric vehicles. [0003] The mainstream lithium-ion power batteries in the industry mainly include three types: square, soft pack and cylindrical. Among them, the prismatic aluminum shell battery is widely used because of its high grouping rate, low stacking (PACK) cost and high system energy density. [0004] At present, the main design scheme of the square aluminum s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0583H01M10/04H01M2/26H01M2/06
CPCH01M10/0431H01M10/0583H01M2220/20H01M50/172H01M50/538Y02E60/10Y02P70/50
Inventor 曹启飞孙威李根雨朴镇奎周滢杰郭恒志金虎权
Owner 湖南领湃科技股份有限公司
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