A low internal resistance composite lithium-ion battery cell and its manufacturing process
A composite lithium and ion battery technology, applied in sustainable manufacturing/processing, electrolyte battery manufacturing, circuits, etc., can solve problems such as rising product defect rate, large battery internal resistance, poor heat dissipation, etc., to improve rate performance and reduce The effect of battery internal resistance and heat generation reduction
Inactive Publication Date: 2016-02-03
维动新能源股份有限公司
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Problems solved by technology
For lithium-ion batteries using the winding process, too long pole pieces will bring unnecessary troubles to the manufacturing process, which will increase the defective rate of the product, and the internal resistance of the battery with long pole pieces is large, which is not conducive to the high current of the battery Charging and discharging seriously hinder the development of batteries in the direction of large capacity and high power
However, the pole piece of the existing winding lithium ion battery adopts the structure that the tab is arranged at one end of the pole piece. Since the tab is generally arranged inside the battery cell, the internal resistance is large and the heat dissipation is poor, which will cause the internal temperature of the battery to rise sharply. There are certain safety hazards in the battery
Method used
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Embodiment 1
[0059] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings, taking a cell with a single cell of 5Ah and double cells connected in parallel with a cell of 10Ah as an example.
[0060] Such as figure 1 As shown, a positive electrode sheet for a 5Ah lithium-ion battery core, which includes an electrode sheet strip 11 , a positive electrode active material 12 , and a tab 12 . A section of blank foil area 14 with a width of 12 mm not coated with active material 12 is provided in the middle of the pole strip 11 for welding the tabs 13 . The tab 13 has a width of 10mm and a thickness of 0.2mm, and the top end is not covered with tab glue 35 . The tab 13 is exposed by 20mm, and the front and back of the blank foil area 14 are pasted with polyester PET insulating tape with a thickness of 0.03mm. The length of the insulating tape is 2.5±0.5mm higher than the upper end of the pole strip 11. A section ...
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Abstract
The object of the present invention is to provide a low internal resistance composite lithium-ion cell and its manufacturing process in view of the above-mentioned defects. Positive and negative tabs are provided, wherein the tabs of the single cells with the same polarity are welded together by ultrasonic welding to form a composite cell, and the positive and negative tab tabs of each single cell are arranged in the middle. It can effectively reduce the internal resistance of the battery without changing the battery capacity, improve the rate performance of the battery, and improve its safety.
Description
Technical field [0001] The present invention belongs to the field of lithium -ion batteries, which specifically involves a low internal resistance compound lithium -ion cell and its manufacturing process with a polarine structure that reduces the internal resistance of lithium -ion batteries and improves safety. Background technique [0002] Lithium -ion batteries have the advantages of high output voltage, high energy density, stable discharge voltage, and long cycle life. They are widely used in various 3C products.At the same time, with the advantages of large output power and long service life, the application of lithium -ion batteries has also extended from the communication industry to electric tools, large energy storage and power batteries.Power batteries are one of the main development directions of lithium ion batteries, which requires it to have a good multiplier performance and high power energy density.At the same time, in order to meet the market's requirements for ...
Claims
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IPC IPC(8): H01M10/0525H01M10/058H01M4/13H01M2/26H01M50/536
CPCH01M4/13H01M10/0525H01M10/0587H01M50/54Y02E60/10Y02P70/50
Inventor 刘素国王艳飞
Owner 维动新能源股份有限公司