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Laser welding method, connection method of electrode post and cover plate and cover plate

A laser welding and electrode technology, applied in laser welding equipment, battery cover/end cover, welding equipment, etc., can solve the problems of high processing cost, achieve low processing cost, ensure air tightness and safety, and improve welding quality Effect

Pending Publication Date: 2022-05-06
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the composite connection of two metal blocks of different metal materials such as copper and aluminum, the conventional method is to weld the workpieces of different metal materials together through friction welding, which is relatively expensive.

Method used

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  • Laser welding method, connection method of electrode post and cover plate and cover plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] figure 1 A schematic diagram of a welding principle of a laser welding method according to an embodiment of the present invention is shown.

[0030] Such as figure 1 As shown, a laser welding method is used to weld the preset welding area 5 of the riveted structure. The riveted structure includes riveted first workpiece 1 and second workpiece 2. The method includes:

[0031] The first laser 3 is welded along the first workpiece 1 side of the welding area 5, and the second laser 4 is used for welding along the second workpiece 2 side of the welding area 5. During the welding process, the first laser 3 and the second laser 4 Maintain synchronous action, and the first laser 3 and the second laser 4 act on both sides of the same position of the welding area 5 at the same time;

[0032] Wherein, the welding power of the first laser 3 matches the melting point of the first workpiece 1 , and the welding power of the second laser 4 matches the melting point of the second work...

Embodiment 2

[0038] The embodiment of the present invention also proposes a method for connecting the electrode pole of the lithium battery and the cover plate, the cover plate includes a through hole, and the method includes:

[0039] Rivet the electrode pole into the through hole of the cover plate;

[0040] The laser welding method as in Example 1 is used to weld and reinforce the riveted joint between the electrode pole and the through hole, wherein the cover plate is the first workpiece 1 and the electrode pole is the second workpiece 2 .

[0041] Specifically, the electrode post is fixed in the through hole of the cover plate by first riveting and then welding, which can effectively ensure the airtightness and safety of the top cover plate. For example, the positive pole and the cover plate are made of aluminum, and the negative pole is made of copper. When welding the positive pole and the cover plate, two lasers with the same power can be used for simultaneous welding. When the bo...

Embodiment 3

[0043] The embodiment of the present invention also proposes a lithium battery top cover, including a cover plate and an electrode pole, and the electrode pole and the cover plate are fixed together by the connection method of the lithium battery electrode pole and the cover plate in the second aspect. The lithium battery top cover has good airtightness and safety.

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Abstract

The invention discloses a laser welding method, a connecting method of an electrode post and a cover plate and the cover plate. The laser welding method is used for welding a preset welding area of a riveting structure, the riveting structure comprises a first workpiece and a second workpiece which are riveted, the laser welding method comprises the steps that welding is carried out along the first workpiece side of the welding area through a first laser, welding is carried out along the second workpiece side of the welding area through a second laser, and in the welding process, the first workpiece side and the second workpiece side are welded; the first laser and the second laser keep synchronous action and act on the two sides of the same position of the welding area at the same moment; wherein the welding power of the first laser is matched with the melting point of the first workpiece, and the welding power of the second laser is matched with the melting point of the second workpiece.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, and more specifically, to a laser welding method, a method for connecting an electrode post and a cover plate, and the cover plate. Background technique [0002] As a new type of green energy, lithium-ion batteries have been rapidly developed and applied in many fields such as automobiles, aerospace, high-speed rail, and handheld electronic devices. With the development of lithium battery industry. People put forward corresponding requirements for its high energy, high power, high safety and other advantages. [0003] For the lithium-ion battery top cover with a riveted structure, laser welding is required on the riveted position to enhance the stability of the structure, otherwise the riveted structure of the top cover will loosen with external vibrations. The commonly used laser welding method is to use a laser to perform laser welding on the welding area of ​​two workpi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21H01M50/543H01M50/147
CPCB23K26/21
Inventor 张洪臣奚明明王兴勤毛永志杨道均吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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