CN114309851A - Dissimilar electrode welding method applied to resistance brazing of copper-aluminum sheets - Google Patents
Dissimilar electrode welding method applied to resistance brazing of copper-aluminum sheets Download PDFInfo
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- CN114309851A CN114309851A CN202210062931.9A CN202210062931A CN114309851A CN 114309851 A CN114309851 A CN 114309851A CN 202210062931 A CN202210062931 A CN 202210062931A CN 114309851 A CN114309851 A CN 114309851A
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- copper
- aluminum
- electrode
- brazing filler
- filler metal
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Abstract
The invention discloses a dissimilar electrode welding method applied to copper-aluminum sheet resistance brazing, which comprises the following steps: the copper foil and the aluminum foil are sandwiched between the electrodes and resistance-brazed, using a material that generates a relatively high amount of heat at the same current as the electrode on the copper foil side and a material that generates a relatively low amount of heat at the same current as the electrode on the aluminum foil side. Under the action of the same current, the invention can make the copper sheet and the aluminum sheet reach the brazing filler metal wetting temperature at the same time, so that the melted liquid brazing filler metal wets the copper-aluminum base metal to form capillary flow, the base metal gap is filled, the base metal is dissolved to the brazing filler metal, and the brazing filler metal is diffused to the base metal, thereby forming firm combination.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a dissimilar electrode welding method applied to resistance brazing of copper-aluminum sheets.
Background
The lithium battery generally adopts copper sheets and aluminum sheets as electrodes, and the copper sheets and the aluminum sheets need to be welded. The welding of copper and aluminum sheets belongs to the welding of heterogeneous metal materials, and the welding of heterogeneous materials has the difficulties that the components are different, the physical and chemical properties are different greatly, the problems of no welding, breakdown, cracking, large deformation, poor performance and the like are easily generated during welding, the functional performance is influenced if the welding is light, and the product safety is influenced if the welding is heavy. If the same electrode is used for clamping the copper-aluminum sheet for resistance brazing, the copper sheet cannot reach the brazing filler metal wetting temperature when the aluminum sheet reaches the brazing filler metal wetting temperature in the same current state, and the aluminum sheet cannot be welded due to the fact that the aluminum sheet is broken down due to too large heat when the current is increased to enable the copper sheet to reach the brazing filler metal wetting temperature.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a dissimilar electrode welding method applied to resistance brazing of copper-aluminum sheets, which can solve the problems.
The invention achieves the technical aim through the following technical scheme.
The dissimilar electrode welding method applied to the resistance brazing of the copper-aluminum sheet has the improvement that: the copper foil and the aluminum foil are sandwiched between the electrodes and resistance-brazed, using a material that generates a relatively high amount of heat at the same current as the electrode on the copper foil side and a material that generates a relatively low amount of heat at the same current as the electrode on the aluminum foil side.
Compared with the prior art, the invention has the following positive effects: under the action of the same current, the copper sheet and the aluminum sheet can reach the brazing filler metal wetting temperature simultaneously, so that the molten liquid brazing filler metal wets the copper-aluminum base metal to form capillary flow, a base metal gap is filled, the base metal is dissolved into the brazing filler metal, and the brazing filler metal is diffused to the base metal, thereby forming firm combination.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
an electrode made of tungsten was used on the copper foil side, and an electrode made of copper was used on the aluminum foil side, and the copper foil and the aluminum foil were sandwiched therebetween, and resistance brazing was performed.
Example two:
the copper foil and the aluminum foil were sandwiched between electrodes made of molybdenum on the copper foil side and electrodes made of a copper alloy on the aluminum foil side, and resistance brazing was performed.
The two embodiments solve the problem of welding the existing copper-aluminum sheet dissimilar electrode, and after welding, the copper sheet and the aluminum sheet are firmly combined.
The invention is suitable for welding other heterogeneous materials except copper-aluminum sheets.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (1)
1. A dissimilar electrode welding method applied to copper-aluminum sheet resistance brazing is characterized by comprising the following steps: the copper foil and the aluminum foil are sandwiched between the electrodes and resistance-brazed, using a material that generates a relatively high amount of heat at the same current as the electrode on the copper foil side and a material that generates a relatively low amount of heat at the same current as the electrode on the aluminum foil side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062931.9A CN114309851A (en) | 2022-01-20 | 2022-01-20 | Dissimilar electrode welding method applied to resistance brazing of copper-aluminum sheets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062931.9A CN114309851A (en) | 2022-01-20 | 2022-01-20 | Dissimilar electrode welding method applied to resistance brazing of copper-aluminum sheets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114309851A true CN114309851A (en) | 2022-04-12 |
Family
ID=81027899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210062931.9A Withdrawn CN114309851A (en) | 2022-01-20 | 2022-01-20 | Dissimilar electrode welding method applied to resistance brazing of copper-aluminum sheets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114309851A (en) |
-
2022
- 2022-01-20 CN CN202210062931.9A patent/CN114309851A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220412 |
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| WW01 | Invention patent application withdrawn after publication |