Square lithium ion battery and fabrication method thereof

A lithium-ion battery, square technology, used in secondary battery manufacturing, secondary batteries, battery assembly machines, etc., can solve the problems of incompact structure and low assembly efficiency, save manpower and material resources, reduce space occupation, increase The effect of a large effective volume

Pending Publication Date: 2018-07-13
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a square lithium ion battery and its preparation method to solve the problems of low assembly efficiency and uncompact structure of the existing square lithium ion battery

Method used

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  • Square lithium ion battery and fabrication method thereof
  • Square lithium ion battery and fabrication method thereof
  • Square lithium ion battery and fabrication method thereof

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Embodiment Construction

[0039] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0040] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "plurality" is two or more; the terms "upper", "lower", "left", "right", "inner ", "outside", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construe...

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Abstract

The invention relates to the technical field of lithium ion battery manufacturing, and discloses a square lithium ion battery and a fabrication method thereof. The method comprises the steps of welding a flexible connector with a tab on a roll core; sleeving a pole post with the flexible connector, and welding the flexible connector on a lower step of the pole post; sleeving the pole post with a sealing ring, and sleeving the sealing ring with a first plastic piece; sequentially installing an insulation film, a top cover sheet, insulation ceramic, a second plastic piece and a conductive blockaround the pole post from top to bottom, wherein the insulation film is clamped between the first plastic piece and the top cover; riveting the pole post and the conductive block; and bending the tab,and wrapping the roll core in the insulation film. According to the battery fabrication method and the battery, provided by the invention, the thickness of the cover plate is reduced, the energy density of the battery is improved, a hot melting process in the prior art is prevented, the assembly process is simplified, the assembly efficiency is improved, the effective volume of the roll core in abattery cell can be expanded when the specification type of the battery cell is not changed, and the energy density of the battery is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery manufacturing, in particular to a square lithium ion battery and a preparation method thereof. Background technique [0002] As the most mature commercialized lithium-ion battery on the market, it is widely used in automotive power supply systems due to its high energy density and high cycle characteristics. Especially for prismatic lithium-ion batteries, due to their own structural characteristics, the packing method is simple and efficient, and the loss of energy density after grouping is small. Therefore, prismatic lithium-ion batteries are widely used in automotive power batteries. [0003] The existing assembly method of the square lithium-ion battery is as follows: after welding the soft connection and the matched winding core, laser welding is carried out with the assembled top cover plate, and finally the tabs are bent and the insulating film is coated, and the coating is compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M2/04H01M10/04H01M50/147
CPCH01M10/0404H01M10/0587H01M50/147Y02E60/10Y02P70/50
Inventor 孙威田秀君戴华斌张亮宫颂
Owner SHENZHEN BAK POWER BATTERY CO LTD
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