Sealing welding device

Abstract

The present application provides a sealing welding device, comprising a bearing assembly, a pressing assembly and a welding assembly; the bearing assembly comprises a first drive member and a support base, the first drive member driving the support base to abut against an end surface of a battery; the pressing assembly comprises a second drive member, a pressing plate and a pressing member, a welding hole penetrating through the pressing plate, and the pressing plate and the pressing member both being connected to the second drive member; the welding assembly is located at the side of the pressing plate facing away from the support base, and the welding assembly welds a sealing nail to the battery by means of the welding hole.

Description

Seal welding device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 30, 2023, with application number 202321717380.1. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a sealing welding device. Background Art

[0003] After the battery is assembled, the electrolyte is injected from the battery injection hole. After the battery is injected, the injection hole needs to be sealed with a sealing nail to prevent the electrolyte from leaking.

[0004] The sealing pins are welded to the battery. The welding device in related art typically includes a clamping mechanism and a welding machine. Before welding the sealing pins, the battery is placed on a workbench. The clamping mechanism then presses the battery against the workbench to secure it. After the battery is secured, the welding machine welds the sealing pins to the battery. In related art, the clamping mechanism does not compress the sealing pins and battery, making them prone to relative movement during the welding process, affecting weld quality. Technical Solutions

[0005] The present application provides a sealing welding device for welding a sealing pin to a battery, comprising:

[0006] The bearing assembly includes a first driving member and a support base, wherein the first driving member is connected to the support base and can drive the support base to press against one end surface of the battery;

[0007] A pressing assembly, comprising a second driving member, a pressing plate, and a pressing member. The pressing plate is provided with a welding hole. Both the pressing plate and the pressing member are connected to the second driving member. The second driving member can drive the pressing plate to press against the other end face of the battery and expose the sealing pin in the welding hole. The pressing member can press the sealing pin against the other end face of the battery.

[0008] The welding assembly is located on the side of the pressure plate away from the support seat. The welding assembly can weld the sealing pin and the battery through the welding hole. Beneficial effects

[0009] The beneficial effects of the sealing welding device provided by the present application are as follows: the sealing welding device can drive the support seat to move through the first driving member so that the support seat can be pressed against one end face of the battery, and the second driving member drives the pressure plate to move so that the pressure plate is pressed against the other end face of the battery, so that the pressure plate and the support seat work together to press against the opposite end face of the battery to position the battery; and the sealing pin provided on the end face of the battery is exposed at the welding hole, and the sealing pin is pressed against the battery by the pressing member, and the welding assembly can weld the sealing pin through the welding hole; during the welding process, since the battery and the sealing pin are both pressed and positioned, no deflection will occur between the two, so that the battery and the sealing pin can remain stable to prevent the concentricity between the sealing pin and the battery filling hole from being too large after welding; at the same time, the welding focal length can be kept fixed during the welding process to ensure the welding quality of the sealing pin by the sealing welding device, prevent weld bursting, and thus improve the sealing of the battery after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a structural schematic diagram of a sealing welding device according to an embodiment of the present application;

[0011] FIG2 is a partial schematic diagram of point A in FIG1 ;

[0012] FIG3 is a second structural diagram of the sealing welding device according to an embodiment of the present application;

[0013] FIG4 is a partial schematic diagram of a compression assembly according to an embodiment of the present application;

[0014] FIG5 is a schematic diagram of the cooperation between the dust removal seat and the pressure plate according to an embodiment of the present application.

[0015] In the picture:

[0016] 100, battery; 110, sealing nail; 120, terminal; 200, manipulator;

[0017] 1. Carrying assembly; 11. First driving member; 12. Support seat; 13. First mounting seat; 14. Second buffer member; 2. Pressing assembly; 21. Second driving member; 22. Pressing plate; 221. Welding hole; 222. Extension groove; 223. Avoidance hole; 23. Pressing member; 231. Pressure rod; 232. Third driving member; 233. Fourth driving member; 234. First buffer member; 24. Detection member; 25. Connecting seat; 26. Third buffer member; 3. Welding assembly; 31. Welding machine; 32. Protective cover; 321. Connecting port; 33. Fifth driving member; 34. Third mounting seat; 4. Dust removal assembly; 41. Dust removal pipe; 42. Dust removal seat; 421. Avoidance channel; 422. Dust removal channel. Modes for Carrying Out the Invention

[0018] After the battery is assembled, inject the electrolyte from the battery injection hole. After the battery is injected,

[0019] Use sealing nails to seal the injection hole to prevent leakage of electrolyte. Currently, welding equipment is required.

[0020] The sealing pins are welded to the battery. The welding device in related art typically includes a clamping mechanism and a welding machine. Before welding the sealing pins, the battery is placed on a workbench. The clamping mechanism then presses the battery against the workbench to secure it. After the battery is secured, the welding machine welds the sealing pins to the battery. In related art, the clamping mechanism does not compress the sealing pins and battery, making them prone to relative movement during the welding process, affecting weld quality.

[0021] Based on this, the embodiment of the present application discloses a sealing welding device, as shown in Figures 1, 2 and 5, which is used to weld a sealing nail 110 to a battery 100. Specifically, the sealing nail 110 is welded to the injection hole of the battery 100 shell. The sealing welding device includes a bearing assembly 1 and a clamping assembly 2. The bearing assembly 1 includes a first driving member 11 and a support seat 12. The first driving member 11 is connected to the support seat 12. The first driving member 11 can drive the support seat 12 to press against one end face of the battery 100; the clamping assembly 2 includes a second driving member 21, a pressing plate 22 and a clamping member 23. The pressing plate 22 is penetrated by a welding hole 221. The clamping member 23 and the pressing plate 22 are both connected to the second driving member 21. The second driving member 21 can drive the pressing plate 22 to press against the other end face of the battery 100 and expose the sealing nail 110 in the welding hole 221. The clamping member 23 can press the sealing nail 110 against the other end face of the battery 100; the welding assembly 3 is located on the side of the pressing plate 22 away from the support seat 12. The welding assembly 3 can weld the sealing nail 110 to the battery 100 through the welding hole 221.

[0022] The sealing welding device of this embodiment can drive the support base 12 to move via the first driving member 11, so that the support base 12 can be pressed against one end face of the battery 100, and the second driving member 21 drives the pressure plate 22 to move, so that the pressure plate 22 is pressed against the other end face of the battery 100, so that the pressure plate 22 and the support base 12 work together to press against the opposite end face of the battery 100 to position the battery 100. The sealing pin 110 provided on the end face of the battery 100 is exposed at the welding hole 221 and is pressed against the battery 100 by the pressing member 23. The welding assembly 3 can weld the sealing pin 110 through the welding hole 221. During the welding process, since the battery 100 and the sealing pin 110 are both pressed and positioned, no deflection occurs between the two, so that the battery 100 and the sealing pin 110 can remain stable, thereby preventing excessive concentricity between the sealing pin 110 and the injection hole of the battery 100 after welding. At the same time, the welding focal length can be kept fixed during the welding process to ensure the welding quality of the sealing welding device on the sealing pin 110, prevent the weld from bursting, and thus improve the sealing of the battery 100 after welding.

[0023] In this embodiment, the sealing welding device utilizes laser welding, so the welding assembly 3 can emit welding light. During the welding process, the welding light can pass through the welding hole 221 to weld the sealing pin 110. In other embodiments, the sealing welding device can also utilize other welding methods such as spot welding, gas welding, electron beam welding, brazing, and heat fusion welding, but this embodiment is not limiting.

[0024] It is understandable that the sealing welding device has two welding steps for the sealing pin 110. When the pressing member 23 is pressed against the sealing pin 110, the welding light passes through the welding hole 221 and spot welds the sealing pin 110 at the position where the pressing member 23 does not contact the sealing pin 110. After the spot welding of the sealing pin 110 is completed, the initial fixation of the sealing pin 110 to the battery 100 is achieved. The pressing member 23 can be separated from the sealing pin 110 to expose the sealing pin 110 completely in the welding hole 221. At this time, the pressing member 23 will not block the sealing pin 110, and the welding assembly 3 can fully weld the entire sealing pin 110.

[0025] Among them, the battery 100 includes a battery cell, a shell and an end cover. The battery cell is arranged in the shell, and the cover plate is arranged at the open end of the shell to seal the battery cell. An injection hole is provided on the end cover, and the injection hole is used to inject electrolyte into the shell. After the injection is completed, the sealing nail 110 is welded to seal the injection hole, and on the end cover, a pole 120 is provided on one side of the injection hole.

[0026] In one embodiment, the sealing pin 100 and the end cap can be made of different materials. During the welding process, the support assembly 1 and the pressing assembly 2 compress the battery 100 and the sealing pin 110 to prevent displacement, so that the welding focal length of the welding assembly 3 can be fixed at a certain position, forming a weld of a predetermined width and depth on the sealing pin 110. This ensures that the weld has good crack resistance and prevents cracking caused by material differences.

[0027] In this embodiment, as shown in Figure 1, the welding assembly 3 includes a fifth driving member 33, a third mounting seat 34 and a welding machine 31. The fifth driving member 33 is connected to the third mounting seat 34. The welding machine 31 is set on the third mounting seat 34. The welding machine 31 can emit welding light. The fifth driving member 33 can drive the third mounting seat 34 to move in the vertical direction to drive the welding machine 31 to move back and forth in the vertical direction, so that the welding machine 31 is close to or away from the sealing nail 110.

[0028] In one embodiment, as shown in Figure 3, the welding assembly 3 includes a protective cover 32, the welding machine 31 is located on the side of the pressure plate 22 away from the support seat 12, the protective cover 32 is located between the welding machine 31 and the pressure plate 22, and the protective cover 32 is located between the welding machine 31 and the pressure plate 22, and is arranged around the periphery of the welding light to reduce the energy loss of the welding light and improve the welding quality.

[0029] Specifically, as shown in Figures 4 and 5, the clamping member 23 includes a pressure rod 231, a third driving member 232 and a fourth driving member 233. The third driving member 232 is connected to the second driving member 21, and the third driving member 232 is connected to the pressure rod 231 through the fourth driving member 233. The fourth driving member 233 drives the pressure rod 231 to move horizontally (X-axis direction in Figure 1), and the third driving member 232 drives the fourth driving member 233 to move in the vertical direction (Z-axis direction in Figure 1) to drive the pressure rod 231 to move in the vertical direction. The fourth driving member 233 can drive the pressure rod 231 to move in the horizontal direction so that the pressure rod 231 can be selectively pressed on the sealing pin 110. When the pressure plate 22 is pressed against the battery 100, the third driving member 232 presses the rod 231 toward the sealing pin 110 along the X-axis direction. After the rod 231 moves to the specified position, the fourth driving member 233 drives the rod 231 to move downward along the Z-axis to press the sealing pin 110. It should be noted that the rod 231 does not completely block the sealing pin 110 from the side of the welding assembly 3, so that the welding assembly 3 can spot weld the exposed area of ​​the sealing pin 110. After the spot welding is completed, the third driving member 232 can drive the rod 231 away from the sealing pin 110 to completely expose the sealing pin 110 from the side of the welding assembly 3, so that the welding machine assembly can fully weld the sealing pin 110.

[0030] In this embodiment, the third driving member 232 and the fourth driving member are both cylinders. In other embodiments, the third driving member 232 can drive the end of the pressure rod 231 adjacent to the sealing pin 110 to rotate.

[0031] Specifically, the pressing member 23 further includes a first buffer member 234, which is respectively located between the fourth driving member 233 and the pressure rod 231. The first buffer member 234 is used to buffer the sealing pin 110 from the pressure of the pressure rod 231, thereby preventing the pressure rod 231 from damaging the sealing pin 110. In a specific embodiment, the first buffer member 234 is a spring.

[0032] Specifically, as shown in Figure 5, the side of the pressure plate 22 facing the support seat 12 is provided with an extension groove 222. The extension groove 222 is connected to the welding hole 221, and the pressure rod 231 is movable within the extension groove 222. By providing the extension groove 222 on the pressure plate 22 to accommodate the pressure rod 231, the pressure rod 231 can move within the extension groove 222, making the entire compression structure more compact. After the sealing pin 110 is spot welded, the pressure rod 231 can completely exit the welding hole 221 along the extension groove 222.

[0033] In one embodiment, the pressure plate 22 is provided with a clearance hole 223. The clearance hole 223 is used to clear the terminal post 120 of the battery cell, thereby allowing the pressure plate 22 to have a larger contact area with the end cap of the battery 100 and achieving a better compression effect. It is understood that the terminal post 120 protrudes from the end cap. By providing the clearance hole 223 on the pressure plate 22, when the pressure plate 22 presses down on the battery 100, the terminal post 120 can be inserted into the clearance hole 223, causing the pressure plate 22 to press against the end cap.

[0034] In one embodiment, as shown in Figure 1, the clamping assembly 2 also includes a detection member 24, which is arranged above the clamping member 23. Specifically, the detection member 24 is arranged on the third mounting seat 34. The detection member 24 is used to detect the distance between the clamping member 23 and the sealing pin 110, so that the sealing welding device can accurately monitor the positional relationship between the pressure rod 231 of the clamping member 23 and the sealing pin 110 to ensure that the pressure rod 231 can effectively compress the sealing pin 110 during welding. In one embodiment, the detection member 24 is connected to the third driving member 232. When the detection member 24 detects that the pressure rod 231 is not pressed into place, the stroke of the third driving member 232 can be adjusted. In a specific embodiment, the detection member 24 is a laser ranging sensor, which can accurately detect the position between the pressure rod 231 and the sealing pin 110.

[0035] In this embodiment, as shown in FIG1 , the support base 12 is located below the pressure plate 22. That is, the first driving member 11 can drive the support base 12 to move upward along the Z axis and press against the lower end surface of the battery 100, and the second driving member 21 can drive the pressure plate 22 to move downward along the Z axis and press against the upper end surface of the battery 100. It can be understood that the battery 100 is clamped and transported from the previous process to the welding process of the sealing nail 110 by the robot 200. When the robot 200 clamps the battery 100 to the specified position, the support base 12 and the pressure plate 22 press and position the upper and lower end surfaces of the battery 100.

[0036] Specifically, as shown in Figure 2, the bearing assembly 1 includes a first mounting seat 13 and a second buffer member 14. The first driving member 11 is connected to the first mounting seat 13, and the support seat 12 is connected to the first mounting seat 13 via the second buffer member 14. The first driving member 11 can drive the first mounting seat 13 to move. Specifically, the first driving member 11 drives the first mounting seat 13 to move along the Z-axis direction to drive the support seat 12 to move. When the support seat 12 moves upward and presses against the battery 100, in order to reduce the rigid collision force of the support seat 12 on the battery 100, the second buffer member 14 can be used to buffer the extrusion force of the support seat 12 on the battery 100, thereby preventing the battery 100 from being damaged by the support seat 12. In a specific embodiment, the second buffer member 14 is a spring.

[0037] Specifically, a second limiting groove is provided on the side of the support seat 12 facing the pressure plate 22. During the welding process, part of the battery 100 is inserted into the second limiting groove. The groove wall of the second limiting groove can limit the battery 100 to further ensure welding stability.

[0038] Specifically, as shown in FIG4 , the pressing assembly 2 further includes a connecting seat 25 and a third buffer member 26 . The pressing plate 22 and the third driving member 232 are both disposed on the connecting seat 25 . The connecting seat 25 is connected to the second driving member 21 via the third buffer member 26 . The second driving member 21 drives the connecting seat 25 downward to drive the pressing plate 22 downwardly to press against the end face of the battery 100 . To reduce the inductive impact force exerted by the pressing plate 22 on the battery 100 , the third buffer member 26 can be used to buffer the extrusion force exerted by the pressing plate 22 on the battery 100 , thereby preventing the battery 100 from being damaged by the pressing plate 22 . In a specific embodiment, the third buffer member 26 is a buffer.

[0039] During the battery 100 production process, dust easily accumulates on the outer surface of the battery 100, which can affect the welding quality of the battery 100. Therefore, dust removal is required before welding in the area to be welded. Specifically, the sealing welding device also includes a dust removal assembly 4. When the pressure plate 22 is pressed against the battery 100, the dust removal assembly 4 can pass through the welding hole 221 to remove dust from the sealing pin 110.

[0040] Specifically, as shown in Figures 1 and 5, the dust removal assembly 4 includes a dust removal pipe 41 and a dust removal seat 42. The dust removal seat 42 is located on the side of the pressure plate 22 away from the support seat 12. The dust removal seat 42 is provided with an avoidance channel 421 for avoiding welding light. The avoidance channel 421 is arranged opposite to the welding hole 221, so that the welding light can pass through the avoidance channel 421 and the welding hole 221 to weld the sealing nail 110. The dust removal seat 42 is provided with a dust removal channel 422 connected to the avoidance channel 421. The dust removal channel 422 is connected to the dust removal pipe 41, so that the dust removal pipe 41 can remove dust from the welding area in the welding hole 221. In this embodiment, the dust removal seat 42 is provided on the pressure plate 22 so that when the pressure plate 22 moves up and down, the dust removal seat 42 can be driven to move.

[0041] In a specific embodiment, the dust removal seat 42 is located in the protective cover 32 , and a connecting port 321 for connecting the dust removal pipe 41 and the dust removal seat 42 is provided on the side wall of the protective cover 32 .

[0042] During the actual welding process: As shown in Figures 1 to 5, after the manipulator 200 grabs the battery and moves to the designated position, the first driving member 11 drives the support seat 12 to move upward along the Z axis to abut against the bottom of the battery 100. The second driving member 21 drives the pressure plate 22 and the pressing member 23 to move downward along the Z axis so that the pressure plate 22 is pressed against the upper end face of the battery 100, and the sealing pin 110 is exposed in the welding hole 221, and the pressure rod 231 of the pressing member 23 presses the sealing pin 110 against the end cover of the battery 100. Before welding, the dust removal pipe 41 performs the first dust removal on the welding area in the welding hole 221. After the first dust removal, the welding machine 31 spot welds the sealing pin 110 to achieve pre-fixation of the sealing pin 110 and the battery 100. After the spot welding is completed, the pressure rod 231 shrinks into the extension groove 222. At this time, the pressure plate 22 will not block the upper end face of the sealing pin 110. The dust removal pipe 41 performs a second dust removal on the welding area in the welding hole 221. After the second dust removal, the welding machine 31 performs full welding on the sealing pin 110 to complete the sealing welding of the sealing pin 110.

Claims

1. A sealing welding device for welding a sealing pin on a battery, comprising: A bearing assembly, comprising a first driving member and a support seat, wherein the first driving member is connected to the support seat, and the first driving member can drive the support seat to press against one end surface of the battery; A pressing assembly, comprising a second driving member, a pressing plate and a pressing member, wherein the pressing plate is provided with a welding hole, the pressing plate and the pressing member are both connected to the second driving member, the second driving member can drive the pressing plate to press on the other end surface of the battery and expose the sealing nail in the welding hole, and the pressing member can press the sealing nail on the other end surface of the battery; A welding assembly is located on a side of the pressing plate away from the supporting seat, and the welding assembly can weld the sealing nail and the battery through the welding hole.

2. The sealing welding device according to claim 1, wherein: The clamping member includes a pressure rod, a third driving member and a fourth driving member. The third driving member is connected to the second driving member, and the third driving member is connected to the pressure rod through the fourth driving member. The third driving member can drive the fourth driving member to move in the vertical direction to drive the pressure rod to move in the vertical direction. The fourth driving member can drive the pressure rod to move in the horizontal direction so that the pressure rod can be selectively pressed on the sealing pin.

3. The sealing welding device according to claim 2, wherein: The pressing member further comprises a first buffer member, which is respectively connected to the fourth driving member and the pressure rod, and is used for buffering the pressure exerted on the sealing pin by the pressure rod.

4. The sealing welding device according to claim 2, wherein: An extension groove is provided on a side surface of the pressure plate facing the support seat, the extension groove is communicated with the welding hole, and the pressure rod is movably disposed in the extension groove.

5. The sealing welding device according to any one of claims 1 to 4, wherein: The pressure plate is provided with an escape hole through it, and the escape hole is used to escape the pole of the battery.

6. The sealing welding device according to any one of claims 1 to 4, wherein: The welding assembly includes a welding machine and a protective cover. The welding machine is located on the side of the pressure plate away from the support seat. The welding machine can emit welding light. The protective cover is located between the welding machine and the pressure plate, and the protective cover is arranged around the periphery of the welding light.

7. The sealing welding device according to any one of claims 1 to 4, wherein: The clamping assembly further comprises a detection member, which is arranged above the clamping member and is used to detect the distance between the clamping member and the sealing pin.

8. The sealing welding device according to any one of claims 1 to 4, wherein: The bearing assembly includes a first mounting seat and a second buffer member, the first driving member is connected to the first mounting seat, the support seat is connected to the first mounting seat through the second buffer member, and the second buffer member is used to buffer the squeezing force of the support seat on the battery.

9. The sealing welding device according to any one of claims 1 to 4, further comprising a dust removal assembly, and when the pressing plate is pressed against the battery, the dust removal assembly can pass through the welding hole to remove dust from the sealing nail.

10. The sealing welding device according to claim 9, wherein: The dust removal assembly includes a dust removal pipe and a dust removal seat, the dust removal seat is located on a side of the pressure plate away from the support seat, the welding assembly can emit welding light, the dust removal seat is provided with an avoidance channel for avoiding the welding light, the avoidance channel is arranged opposite to the welding hole, the dust removal seat is provided with a dust removal channel connected with the avoidance channel, and the dust removal channel is connected with the dust removal pipe.

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