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Lithium ion battery and manufacturing method thereof

A lithium-ion battery and cell technology, applied in secondary batteries, battery components, final product manufacturing, etc., can solve the problems of short cycle life of lithium-ion batteries and limit the promotion and use of lithium-ion batteries, and achieve electrochemical reactions Uniformity, uniform distribution, and the effect of improving cycle life

Active Publication Date: 2014-10-01
SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] according to figure 1 According to the test results, the cycle life of traditional lithium-ion batteries is very short, which greatly limits the promotion and use of lithium-ion batteries

Method used

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  • Lithium ion battery and manufacturing method thereof
  • Lithium ion battery and manufacturing method thereof
  • Lithium ion battery and manufacturing method thereof

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Embodiment Construction

[0024] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] figure 2 is a schematic diagram of the structure of a lithium-ion battery in an embodiment. The lithium ion battery includes a pole piece 100 , an inner tab 200 and an outer tab 300 . The inner tab 200 is welded to one side of the rolled end of the pole piece 100 . The outer lug 300 is welded to one side of the tail end of the pole piece 100 . The cross-sectional area (area of ​​the cross-section) of the inner tab 200 is smaller than the cross-sectional area of ​​the outer tab 300 .

[0026] In this embodiment, the cross-sectional area of ​​the inner tab 200 is not greater than 0.4mm 2 . The cross-sectional area of ​​the outer lug 300 is greater than 0.4mm 2 . Further, the cross sections of the inner tab 200 and the outer tab 300 are both rectangular. Furthermore, the length and width of the cross section of the ...

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Abstract

The invention relates to a lithium-ion battery and a manufacturing method thereof. The lithium-ion battery includes a pole piece, and also includes an inner pole lug and an outer pole lug, the inner pole lug is welded to one side of the coiled end of the pole piece, and the The outer lug is welded to one side of the tail end of the pole piece, and the cross-sectional area of ​​the inner lug is smaller than that of the outer lug. In the present invention, the inner tab is welded on the side of the roll-up end of the pole piece, and the outer tab is welded on the side of the tail end of the pole piece. The cross-sectional area of ​​the inner tab is smaller than that of the outer tab. By optimizing the internal structure of the lithium-ion battery, During the charging and discharging process of the lithium-ion battery, the current is more evenly distributed on the surface of the pole piece, and the electrochemical reaction is also more uniform, thereby improving the cycle life of the lithium-ion battery.

Description

【Technical field】 [0001] The invention relates to the field of batteries, in particular to a lithium ion battery and a manufacturing method thereof. 【Background technique】 [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. It is widely used in mobile Telephones, laptop computers, electronic instruments, electric tools, electric bicycles and weapons and equipment, etc. [0003] figure 1 It is the result graph of the cycle life test of the traditional lithium-ion battery. Test the cycle life of the traditional lithium-ion battery. The test method: charge the traditional lithium-ion battery from 1.5A to 3.6V, cut-off current 0.02A, rest for 10 minutes, discharge 20A to 2.0A, and rest for 45 minutes; judgment standard: 300 cycles The remaining ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/26H01M10/0587
CPCY02E60/10Y02P70/50
Inventor 唐赞谦相江峰桑玉李文良
Owner SPRINGPOWER TECHNOLOGY (SHENZHEN) CO LTD
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