Power battery shell bottom DOE welding device

Abstract

The utility model discloses a DOE welding device for the bottom of a power battery shell, comprising a welding piece and a hollow positioning shell, the positioning shell having the same size as the actual shell of the power battery, one end of the positioning shell being open, and the other end of the positioning shell being the shell bottom of the positioning shell, a through mounting opening corresponding to the welding piece is provided on the shell bottom, a material taking opening is provided on at least one side of the mounting opening, the material taking opening is connected to the mounting opening, the welding piece is embedded in the mounting opening, the positioning shell can move above or below the welding piece under the action of external force, the utility model designs a detachably connected shell bottom and welding piece to perform DOE welding of the bottom of the power battery shell, the positioning shell can be reused, and only a relatively cheap welding piece needs to be customized or replaced, the utility model can avoid the situation where a large amount of shell waste is caused by the shell bottom DOE welding verification, and effectively reduce the DOE welding verification cost; in addition, since the welding piece can be taken out to confirm the welding quality after welding with the subsequent collecting plate, it is easier to judge whether a cold weld occurs in the welding.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, in particular to a DOE welding device for a power battery shell bottom. Background Art

[0002] With the increasingly serious crisis of non-renewable energy and the strong guidance of national policies, electric vehicles have become the main trend of the future development of the automobile industry. As an important component of electric vehicles, lithium-ion / sodium-ion cylindrical power batteries have the highest installed capacity in the field of electric vehicles due to their advantages such as small size, high energy density and green environmental protection. Common problems: 1. In order to ensure the production yield, general cylindrical power batteries generally first conduct shell bottom welding DOE (DESIGN OF EXPERIMENT) verification, and continuously change different parameters to seek the best parameters, resulting in large shell waste, high cost, and the welding quality cannot be visually confirmed after welding (whether it is a cold weld, the size of the weld spot, the welding tension, etc.); 2. Cylindrical power batteries have gradually begun to try laser penetration welding technology (the fixture passes through the bare battery cell upward to support the collector plate, and the fixture presses the shell bottom downward). DOE verification is also required first, and different welding parameters are continuously changed to seek the best parameters, resulting in large shell waste, high cost, and the welding quality cannot be visually confirmed after welding. Summary of the invention

[0003] The utility model aims to provide a DOE welding device for the bottom of a power battery shell, so as to reduce the waste of the shell and visually confirm the welding quality.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a DOE welding device for the bottom of a power battery shell, comprising a welding plate and a hollow positioning shell, wherein the positioning shell is the same size as the actual shell of the power battery, one end of the positioning shell is open, and the other end of the positioning shell is the shell bottom of the positioning shell, a through mounting opening is provided on the shell bottom corresponding to the welding plate, a material removal opening is provided on at least one side of the mounting opening, the material removal opening is connected to the mounting opening, the welding plate is embedded in the mounting opening, and the positioning shell can move above or below the welding plate under the action of external force.

[0005] Preferably, it also includes a bare cell and a current collecting plate, wherein the bare cell is arranged in the positioning shell and a current collecting plate is placed between the bare cell and the shell bottom, and the current collecting plate is arranged corresponding to the welding plate so that the current collecting plate and the welding plate can be welded and connected.

[0006] Preferably, the inner diameter of the mounting opening is larger than the outer diameter of the welding piece.

[0007] Preferably, the material taking port extends to a side surface of the positioning shell.

[0008] Preferably, there are two material taking ports, and the two material taking ports are respectively arranged on both sides of the installation port.

[0009] Preferably, the upper end of the mounting opening is provided with a chamfer.

[0010] Preferably, the thickness of the welding sheet is the same as the thickness of the shell bottom of the positioning shell.

[0011] Preferably, the material of the welding sheet is the same as that of the positioning shell.

[0012] Preferably, the positioning shell and the welding sheet are both made of steel or the positioning shell and the welding sheet are both made of aluminum.

[0013] Compared with the prior art, the utility model designs a detachably connected shell bottom and welding sheet to perform DOE welding of the power battery shell bottom. The positioning shell can be reused, and only relatively cheap welding sheets need to be customized or replaced. The utility model can avoid the situation where a large amount of shell is wasted due to the shell bottom DOE welding verification, and effectively reduce the DOE welding verification cost; in addition, since the welding sheet can be taken out after welding with the subsequent collecting plate to confirm the welding quality, it is easier to directly judge whether a cold weld occurs in the welding, quickly confirm the welding quality, and improve the shell bottom DOE welding verification speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of an angle of the positioning shell of the DOE welding device for the bottom of the power battery shell of the utility model.

[0015] Figure 2 This is a structural diagram from another angle of the positioning shell of the DOE welding device for the bottom of the power battery shell of the utility model.

[0016] Figure 3 This is a structural diagram of the DOE welding device for the bottom of a power battery shell of the present utility model.

[0017] Figure 4 for Figure 3 Exploded diagram of .

[0018] Figure 5 for Figure 3 Sectional view DETAILED DESCRIPTION

[0019] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0020] like Figures 1 to 5As shown, an embodiment of the utility model provides a DOE welding device for the bottom of a power battery shell, comprising a welding piece 2 and a hollow positioning shell 1. The positioning shell 1 has the same size as the actual shell of the power battery, one end of the positioning shell 1 is open, and the other end of the positioning shell 1 is a shell bottom 12 of the positioning shell 1. A through mounting opening 13 is provided on the shell bottom 12 corresponding to the welding piece 2, and a material removal opening 14 is provided on at least one side of the mounting opening 13, and the material removal opening 14 is connected to the mounting opening 13. The welding piece 2 is embedded in the mounting opening 13, and the positioning shell 1 can move above or below the welding piece 2 under the action of external force. Specifically, one end of the positioning shell 1 is an open shell opening 11, and the other end is a shell bottom 12. The positioning shell 1 can adopt a shell of the same model as the actual shell of the power battery, and the actual shell is formed by machining a mounting opening 13 and a material removal opening 14. The mounting opening 13 can be circular or square, etc., and the specific shape can be selected according to actual needs. The welding piece 2 can be detachably embedded in the mounting opening 13, and the positioning shell 1 can move upward relative to the welding piece 2 under the action of external force to separate from the welding piece 2, so that the welding piece 2 can be taken out after being welded to the subsequent collecting plate 4 to confirm the welding quality.

[0021] The embodiment of the utility model designs a detachably connected shell bottom 12 and a welding sheet 2 to perform DOE welding of the power battery shell bottom. The positioning shell 1 can be reused, and only the relatively cheap welding sheet 2 needs to be customized or replaced. The embodiment of the utility model can avoid the situation where a large amount of shell waste is caused by the shell bottom DOE welding verification, and effectively reduce the DOE welding verification cost; in addition, since the welding sheet 2 can be taken out after welding with the subsequent collecting plate 4 to confirm the welding quality, it is easier to directly judge whether the welding has a cold weld, quickly confirm the welding quality, and improve the shell bottom DOE welding verification speed.

[0022] In the embodiment of the utility model, the DOE welding device for the bottom of the power battery shell also includes a bare cell 3 and a collector plate 4. The bare cell 3 is arranged in the positioning shell 1 and the collector plate 4 is placed between the bare cell 3 and the shell bottom 12. The collector plate 4 is arranged corresponding to the welding sheet 2 so that the collector plate 4 and the welding sheet 2 can be welded. Specifically, the collector plate 4 includes a disc-shaped body 41 and a protrusion 42 arranged in the middle of the disc-shaped body 41. The protrusion 42 is attached to the welding sheet 2 and the collector plate 4 is welded to the welding sheet 2 from the outside of the welding sheet 2 by laser penetration welding. In the embodiment of the utility model, the positioning shell 1 is set to the same size as the actual shell of the power battery, and the collector plate 4 is overlapped on the bare cell 3, which can simulate the shell bottom welding of the actual shell. The welding verification is closer to the real welding scene, the verification effect is better, and the design is very clever.

[0023] In the embodiment of the utility model, the inner diameter of the installation opening 13 is larger than the outer diameter of the welding piece 2. Specifically, the inner diameter of the installation opening 13 is slightly larger than the outer diameter of the welding piece 2 so that the welding piece 2 is embedded in the installation opening 13, that is, the installation opening 13 is used to limit the welding piece 2.

[0024] In the embodiment of the utility model, the material taking port 14 extends to the side of the positioning shell 1. Specifically, by extending the material taking port 14 to the side of the positioning shell 1, after the welding sheet 2 and the collecting plate 4 are welded, the material taking port 14 can be used to directly observe whether there is a cold weld from the side, which is a very clever design.

[0025] In the embodiment of the utility model, there are two material taking ports 14, which are respectively arranged on both sides of the installation port 13. Specifically, by setting two material taking ports 14, the welding sheet 2 can be easily installed, and whether there is a cold weld can be observed from both sides, which is a clever design.

[0026] In the embodiment of the utility model, the upper end of the installation opening 13 is provided with a chamfer 131. Specifically, the upper end of the installation opening 13 is provided with a chamfer 131 to facilitate the welding sheet 2 to be installed into the installation opening 13 along the chamfer 131.

[0027] In the embodiment of the utility model, the thickness of the welding sheet 2 is the same as the thickness of the shell bottom 12 of the positioning shell 1. Specifically, the thickness of the welding sheet 2 is the same as the thickness of the shell bottom 12 of the positioning shell 1 to fully simulate the shell bottom structure of the existing power battery, and the welding verification is closer to the actual situation.

[0028] In the embodiment of the utility model, the material of the welding sheet 2 is the same as that of the positioning housing 1. Specifically, the material of the positioning housing 1 and the welding sheet 2 are both steel or the material of the positioning housing 1 and the welding sheet 2 are both aluminum, that is, the material of the positioning housing 1 and the welding sheet 2 is the same as that of the actual housing of the existing power battery.

[0029] The installation and use steps of the DOE welding device for the bottom of the power battery shell of the embodiment of the utility model are as follows: first, the current collecting plate 4 is placed directly on the bare battery cell 3, and the positioning shell 1 is set on the outer side of the current collecting plate 4 and the bare battery cell 3, and then the welding piece 2 is slid into the mounting port 13 along the chamfer 131 of the mounting port 13, and then the current collecting plate 4 and the welding piece 2 are laser penetrated and welded. After the welding is completed, first confirm whether there is a cold weld from the material taking port 14 at the edge of the mounting port 13, and then move the positioning shell 1 upward toward the welding piece 2 to remove the positioning shell 1, and finally directly remove the current collecting plate 4 and the welding piece 2 welded together, use CCD to observe the size of the weld spot and use a tensile testing machine to perform a welding tensile test to further confirm the welding quality.

[0030] The embodiment of the utility model forms a positioning shell 1 by processing the mounting port 13 and the material removal port 14 of the shell of the same type of cylindrical power battery, directly places the collecting plate 4 on the bare battery cell 3, and sets the positioning shell 1, then slides the welding sheet 2 into the mounting port 13 along the outer chamfer 131 on the upper part of the mounting port 13, and then performs laser penetration welding of the collecting plate 4 and the welding sheet 2. After the welding is completed, first confirm whether there is a cold weld from the edge of the material removal port 14, then remove the positioning shell 1, and finally directly remove the welding collecting plate 4 and the welding sheet 2 from the bare battery cell 3 to further confirm the welding quality; finally, the positioning shell 1 can be reused, and only the relatively cheap welding sheet 2 needs to be customized / replaced, and it is easy to directly judge whether a cold weld occurs, and the welding quality can be quickly confirmed; finally, a large amount of waste of the shell caused by the shell bottom DOE welding verification can be avoided, the DOE welding verification cost can be reduced, the shell bottom DOE welding verification speed can be increased, and the welding quality confirmation can be completed quickly.

[0031] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A power battery shell bottom DOE welding device, characterized in that: It includes a welding piece and a hollow positioning shell, the positioning shell has the same size as the actual shell of the power battery, one end of the positioning shell is open, and the other end of the positioning shell is the shell bottom of the positioning shell, a through installation opening is provided on the shell bottom corresponding to the welding piece, a material removal opening is provided on at least one side of the installation opening, the material removal opening is connected to the installation opening, the welding piece is embedded in the installation opening, and the positioning shell can move above or below the welding piece under the action of external force.

2. The power battery shell bottom DOE welding device according to claim 1, characterized in that: It also includes a bare cell and a current collecting plate. The bare cell is arranged in the positioning shell and a current collecting plate is placed between the bare cell and the shell bottom. The current collecting plate is arranged corresponding to the welding piece so that the current collecting plate and the welding piece can be welded and connected.

3. The power battery shell bottom DOE welding device according to claim 1, characterized in that: The inner diameter of the mounting opening is greater than the outer diameter of the welding piece.

4. The power battery shell bottom DOE welding device according to claim 1, characterized in that: The material taking port extends to the side surface of the positioning shell.

5. The power battery shell bottom DOE welding device according to claim 4, characterized in that: There are two material taking ports, and the two material taking ports are respectively arranged on both sides of the installation port.

6. The power battery shell bottom DOE welding device according to claim 1, characterized in that: The upper end of the installation opening is provided with a chamfer.

7. The power battery case bottom DOE welding device according to claim 1, characterized in that: The thickness of the welding sheet is the same as the thickness of the shell bottom of the positioning shell.

8. The power battery case bottom DOE welding device according to claim 1, characterized in that: The material of the welding sheet is the same as that of the positioning shell.

9. The power battery case bottom DOE welding device according to claim 1, characterized in that: The positioning shell and the welding sheet are both made of steel or the positioning shell and the welding sheet are both made of aluminum.

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