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Lithium ion secondary cell

A secondary battery, lithium ion technology, applied in secondary batteries, lithium storage batteries, battery electrodes, etc., can solve the problems of large space occupied by the current collecting fixture, reduce the internal resistance of the battery, and large contact resistance, and achieve excellent cycle characteristics. The effect of high impact resistance and low battery internal resistance

Inactive Publication Date: 2004-09-29
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the edge of the pole piece is clamped by the current collector fixture, and the contact resistance is relatively large, which is not conducive to reducing the internal resistance of the battery.
Moreover, the current collector fixture takes up a lot of space, which reduces the capacity and energy density of the battery, and the assembly process is also more complicated.

Method used

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Examples

Experimental program
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Embodiment 1

[0029]Positive sheet production: Dissolve a certain amount of PVDF in NMP at a certain ratio, add LiCoO2 and acetylene black to the solution, mix thoroughly to make a slurry, and its composition is LiCoO2: acetylene black: PVDF=92:4:4. This slurry was uniformly coated on a 20 μm aluminum foil, and dried at 120° C. After calendering, a positive electrode sheet with a thickness of 120 μm was obtained. The dressing layer on the edge of the positive electrode sheet was scraped off again to expose the aluminum foil with a width of 10 mm.

[0030] Negative sheet production: Dissolve a certain amount of PVDF in NMP at a certain ratio, add artificial graphite into the solution, mix thoroughly to form a slurry, and its composition is artificial graphite:PVDF=95:5. Furthermore, this slurry was uniformly coated on the copper foil of 20 micrometers, and it dried at 120 degreeC. After calendering, a negative electrode sheet with a thickness of 120 μm was obtained. Then the coating layer...

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Abstract

A Li ionic secondary battery includes an electrode component composed a positive, a negative and membranes, a collecting component and electrolyte contained in a battery case, among which, the collecting component includes a connecting board and a lead-out plate, the face of the board is soldered together with the end face of an end collector of the electrode component in the way of sweating of immersing melted solders, one end of the lead-out plate is conducted with the connecting board, the other is linked with the battery pole, the collecting part has high connection strength, so sealing-off or short circuit would not happen.

Description

【Technical field】 [0001] The invention relates to a lithium ion secondary battery, in particular to a lithium ion secondary battery with lower internal resistance and better cycle characteristics. 【Background technique】 [0002] At present, lithium-ion secondary batteries have been widely used in various electronic products, and are favored for their many superior properties such as high voltage, large specific energy, small self-discharge, and no memory effect. However, compared with other secondary batteries, lithium-ion batteries have higher internal resistance, so the voltage drops sharply when discharged at a high rate, the discharge time is greatly shortened, the battery capacity is greatly reduced, and the heat is severe. It is generally believed that the low conductivity of non-aqueous electrolytes and the low conductivity of conventional electrodes are the main reasons for the high internal resistance of lithium-ion secondary batteries. [0003] Most commercial lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/48H01M4/50H01M4/52H01M4/58H01M10/36H01M10/40H01M50/534H01M50/536H01M50/538
CPCH01M2/263Y02E60/122H01M4/505H01M4/131H01M4/525H01M10/052Y02E60/10H01M50/538H01M50/534H01M50/536
Inventor 周耀华王传福
Owner BYD CO LTD
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