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Resistance welding structure and welding method of lithium ion battery

A lithium-ion battery, resistance welding technology, applied in resistance welding equipment, secondary batteries, structural parts, etc., can solve problems such as false welding of pole ears, metal burning, affecting battery electrical performance and safety performance, etc.

Inactive Publication Date: 2020-11-06
WUHU ETC BATTERY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the assembly and welding of lithium-ion batteries, the resistance welding of batteries has problems such as false welding of tabs and metal burning, resulting in increased internal resistance of the battery, inconsistent performance and poor welding reliability, thus affecting the electrical performance and even safety performance of the battery.

Method used

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  • Resistance welding structure and welding method of lithium ion battery
  • Resistance welding structure and welding method of lithium ion battery
  • Resistance welding structure and welding method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Example 1: Welding of the Ni material connecting piece of the cylindrical battery top cover: For the series-parallel welding of the connecting piece of the 18650 cylindrical battery top cover, the thickness of the Ni material connecting piece is 0.4mm, and it is placed on the battery top cover. The cover makes good contact.

[0031] The left and right welding electrodes are in good contact with the matching connecting piece of the battery for resistance welding. To adjust the welding power supply, first adjust to CH1 mode—the welding voltage is CH1 (generally 10V), the welding time is Weld1 (the value is 6s), the current direction of the welding electrode is from the right welding electrode, and flows into the left welding electrode through the connecting piece. After welding, if there is no false welding in the welding point on the right side, then adjust to CH2 mode—the welding voltage is CH2 (generally 10V), the welding time is Weld2 (the value is 6s), and the direct...

Embodiment 2

[0032] Example 2: Resistance welding of current collector tabs and adapter sheets of square multi-tab winding batteries: During the manufacturing process of square hard-shell lithium-ion batteries, after homogenization-coating-cold pressing-die-cutting-slitting - After the winding process, the bare cell tabs and adapters start to be welded and assembled. After the current collector is matched with the aluminum adapter piece or copper adapter piece, confirm that the surface of the material is clean and in good contact. After the left and right welding electrode structures are in good contact, start resistance welding.

[0033] To adjust the welding power supply, first adjust to CH1 mode—the welding voltage is CH1 (generally 10V), the welding time is Weld1 (the value is 6s), the current direction of the welding electrode is from the right welding electrode, and flows into the left welding electrode through the connecting piece. After welding, if there is no false welding in the ...

Embodiment 3

[0034] Example 3: Tab welding of the tabs of the soft-packed battery. During the manufacturing process of the soft-packed battery, after the homogenization-coating-cold-press-die-cutting-slitting-winding process, the bare battery tab and Ni , Al Tab started welding. After the tab is matched with the aluminum and nickel material Tab, confirm that the surface of the material is clean and in good contact. After the left and right welding electrode structures are in good contact, start resistance welding.

[0035]To adjust the welding power supply, first adjust to CH1 mode—the welding voltage is CH1 (generally 10V), the welding time is Weld1 (the value is 6s), the current direction of the welding electrode is from the right welding electrode, and flows into the left welding electrode through the connecting piece. After welding, if there is no false welding in the welding point on the right side, then adjust to CH2 mode—the welding voltage is CH2 (generally 10V), the welding time i...

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Abstract

The invention discloses a resistance welding structure and welding method of a lithium ion battery. The welding method concretely comprises the following steps that S1, a welding power supply outputswelding voltage CH1, namely the welding voltage between two adjacent welding electrodes is CH1, and the welding time is Weld1; S2, after welding, the welding power supply outputs welding voltage CH2,namely the welding voltage between two adjacent welding electrodes is CH2, and the welding time is Weld2; S3, after welding, the step S1 and the step S2 are performed circularly until welding is completed; and the flow directions of welding current formed by the welding voltage CH1 and the welding voltage CH2 at each welding spot are opposite. By adjusting the voltage frequency CH1 / CH2 of power supply equipment and then changing the directions of the welding current of the two adjacent welding electrodes, the welding method can obtain stale welding strength. The welding method is conducive towide application and has great practical significance in production.

Description

technical field [0001] The invention belongs to the field of battery technology, and more specifically, the invention relates to a resistance welding structure and welding method of a lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery that can be repeatedly charged and discharged. It is composed of cathode and anode plates, separator, electrolyte, mechanical parts and other main components. Lithium-ion batteries are widely used in large and medium-sized electric equipment such as portable electronic devices, electric vehicles, electric bicycles, and electric tools, so the requirements for the quality pass rate of lithium-ion batteries are getting higher and higher. In terms of assembly and welding of lithium-ion batteries, there are problems such as false welding of tabs and metal burning in resistance welding of batteries, resulting in increased internal resistance of batteries, inconsistent performance and poor welding reliability...

Claims

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Application Information

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IPC IPC(8): B23K11/00H01M10/0525H01M2/26H01M10/058
CPCB23K11/002H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 吴正能窦元运
Owner WUHU ETC BATTERY LTD