Battery cell top cover welding jig

Abstract

This utility model discloses a welding fixture for battery cell top covers, belonging to the field of welding fixture technology. This utility model connects the fixture support plate, fixture limiting frame, and fixture base in a modular manner. This not only allows for independent replacement of individual parts, reducing maintenance costs, but also allows for adjustment of the fixture support plate's position to accommodate battery cell top covers of different thicknesses. This prevents deformation of the battery cell top cover due to localized stress during welding due to welding torch pressure. Furthermore, the fixture support plate and support plate are connected by an elastic buffer assembly, which buffers and protects the battery cell top cover from deformation when the welding torch applies pressure during welding. Simultaneously, a heat dissipation component rapidly dissipates the high temperatures generated during welding, preventing heat conduction into the battery cell and interference with its internal structure. This device provides sufficient protection during the welding process of battery cell top covers.

Description

Technical Field

[0001] This utility model relates to the field of welding fixture technology, specifically a welding fixture for battery cell top covers. Background Technology

[0002] The cell top cover is an important component of a lithium battery cell. It is usually located at the top of the cell and serves multiple functions, including electrical connection, sealing and protection, and structural support. Its design and performance directly affect the safety, reliability and lifespan of the lithium battery.

[0003] Traditional welding fixtures for battery cell top covers are mostly made of a single piece of metal (such as aluminum alloy). They typically use slots to position the top cover. After long-term use, wear of the metal material leads to positioning deviations, requiring the entire fixture to be replaced, which increases replacement costs. At the same time, the high temperature during welding (such as laser welding temperature ≥1000℃) is conducted to the battery cell body, which may cause the internal diaphragm to melt or the electrolyte to evaporate, affecting the battery cell performance. In addition, the fixture lacks an elastic buffer structure, and the pressure during welding is directly applied to the top cover, which can easily cause the top cover to deform (such as flatness deviation >0.2mm), leading to the failure of the sealing ring and causing electrolyte leakage. Therefore, traditional battery cell top cover welding fixtures are insufficient in protecting the battery cell top cover. Utility Model Content

[0004] The purpose of this utility model is to provide a welding fixture for battery cell top covers. By separating the fixture limiting frame from the fixture support plate, it is not only convenient to position battery cell top covers of different sizes by changing the fixture limiting frame, but also avoids replacing the entire fixture, thus reducing costs. Subsequently, an elastic buffer component is provided between the fixture support plate and the support plate to provide buffer protection when the battery cell top cover is pressed and welded, preventing the battery cell top cover from being deformed by force. Then, a heat dissipation component is used to quickly dissipate heat, reducing the impact of battery cell top cover welding on the battery cell structure, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a welding fixture for a battery cell top cover, comprising:

[0006] Fixture base;

[0007] The top of the fixture base has a storage cavity, and a fixture tray and a support plate are movably arranged in the storage cavity from top to bottom. A fixture limiting frame for limiting different top covers is installed on the outer periphery of the top of the fixture tray. The fixture tray and the support plate are connected by an elastic buffer component.

[0008] The fixture base is also equipped with a heat dissipation component for dissipating the high temperature generated during welding.

[0009] Preferably, four sets of electric actuators are fixed around the bottom of the fixture base. The piston rods of the electric actuators pass through the storage cavity and are fixedly connected to the bottom of the support plate. The four sets of electric actuators are used in conjunction with the grating ruler.

[0010] Preferably, the elastic buffer assembly includes a rubber column located between the support plate and the fixture support plate, with both ends of the rubber column bonded to the fixture support plate and the support plate, respectively.

[0011] Preferably, the bottom of the fixture limiting frame is fixed with a plug-in post, and the top of the fixture support plate is provided with a plug-in hole, and the plug-in post is used in conjunction with the plug-in hole.

[0012] Preferably, the heat dissipation component includes multiple sets of through holes opened on the side wall of the fixture base, and an exhaust fan is installed in the through holes. The fixture support plate is provided with a through groove that cooperates with the top cover.

[0013] Preferably, a limiting rod is fixed around the bottom of the fixture support plate, a limiting hole is formed at the top of the support plate, and the bottom of the limiting rod is slidably disposed in the limiting hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model connects the fixture support plate, fixture limiting frame, and fixture base in a modular manner. This not only allows for the independent replacement of individual parts, reducing maintenance costs, but also allows for the adjustment of the fixture support plate's position to accommodate battery cell top covers of different thicknesses. This prevents deformation of the battery cell top cover due to localized stress during welding due to the pressure applied by the welding torch. Furthermore, the fixture support plate and support plate are connected by an elastic buffer assembly, which buffers and protects the battery cell top cover from deformation when the welding torch applies pressure during welding. Simultaneously, the heat dissipation assembly rapidly dissipates the high temperatures generated during welding, preventing heat conduction into the battery cell and thus avoiding interference with its internal structure. This device provides sufficient protection during the welding process of the battery cell top cover.

[0016] 2. This utility model can precisely adjust the height of the support plate by using an electric push rod and a grating ruler, thereby positioning and storing battery cell top covers of different thicknesses, and avoiding deformation of the battery cell top cover caused by the welding gun not taking into account the thickness tolerance of the battery cell top cover when welding. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a cross-sectional perspective view of the three-dimensional structure of the fixture base of this utility model;

[0019] Figure 3This is a three-dimensional structural diagram showing the disassembled jig tray and support plate of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the fixture base of this utility model.

[0021] The following are labeled in the diagram: 1. Fixture base; 2. Fixture support plate; 3. Support plate; 4. Fixture limiting frame; 5. Electric actuator; 6. Rubber column; 7. Insertion column; 8. Insertion hole; 9. Exhaust fan; 10. Through groove; 11. Limiting rod; 12. Limiting hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides, for example Figures 1-4 The shown is a welding fixture for the top cover of a battery cell, comprising:

[0024] Fixture base 1;

[0025] The top of the fixture base 1 has a storage cavity, and the fixture tray 2 and the support plate 3 are movably arranged in the storage cavity from top to bottom. The outer periphery of the top of the fixture tray 2 is equipped with a fixture limiting frame 4 to limit the position of different top covers. The fixture tray 2 and the support plate 3 are connected by an elastic buffer component.

[0026] The fixture base 1 is also equipped with a heat dissipation component for dissipating the high temperature generated during welding;

[0027] By connecting the fixture support plate 2, fixture limiting frame 4, and fixture base 1 in a modular manner, not only can individual parts be replaced independently, reducing maintenance costs, but the position of the fixture support plate 2 can also be adjusted to accommodate battery cell top covers of different thicknesses. This prevents deformation of the battery cell top cover due to localized stress caused by welding torch pressure during welding. Furthermore, the fixture support plate 2 and support plate 3 are connected by an elastic buffer assembly, which buffers and protects the battery cell top cover when the welding torch applies pressure during welding, preventing deformation. Simultaneously, the heat dissipation assembly rapidly dissipates the high temperatures generated during welding, preventing heat conduction into the battery cell and interfering with its internal structure. This device provides sufficient protection during the welding process of the battery cell top cover.

[0028] Among them, such as Figure 1-2 As shown:

[0029] Four sets of electric actuators 5 are fixed around the bottom of the fixture base 1. The piston rods of the electric actuators 5 pass through the storage cavity and are fixedly connected to the bottom of the support plate 3. The four sets of electric actuators 5 are used in conjunction with the grating ruler. The height of the support plate 3 can be precisely adjusted by the electric actuators 5 and the grating ruler, so as to position and store the top cover of the battery cell with different thicknesses. This avoids the deformation of the top cover of the battery cell caused by the welding gun not taking into account the thickness tolerance of the top cover of the battery cell when welding it.

[0030] Furthermore, such as Figure 3 As shown:

[0031] The elastic buffer assembly includes a rubber column 6 located between the support plate 3 and the fixture support plate 2. The two ends of the rubber column 6 are bonded to the fixture support plate 2 and the support plate 3 respectively. The support plate 3 and the fixture support plate 2 are connected by the rubber column 6. The elastic rebound of the rubber column 6 supports the fixture and also plays a role in buffering and protection.

[0032] Preferred, such as Figure 2 As shown:

[0033] The bottom of the fixture limiting frame 4 is fixed with a plug-in post 7, and the top of the fixture support plate 2 is provided with a plug-in hole 8. The plug-in post 7 and the plug-in hole 8 are used together. By using the plug-in post 7 and the plug-in hole 8 together, it is convenient to install the fixture limiting frame 4, use the fixture limiting frame 4 to position the top cover of the battery cell, and at the same time, it is convenient to remove and replace the fixture limiting frame 4. This avoids wear and tear of the fixture positioning frame over a long period of use, which would reduce the positioning accuracy and reduce replacement costs.

[0034] It is worth noting that, such as Figure 1 and Figure 4 As shown:

[0035] The heat dissipation component includes multiple sets of through holes on the side wall of the fixture base 1, and an exhaust fan 9 is installed in the through holes. The fixture support plate 2 has a through groove 10 that works with the top cover. By installing the exhaust fan 9 in the through holes on the side wall of the fixture base 1, the heat inside the fixture base 1 can be quickly discharged, avoiding the rapid accumulation of heat on the top cover of the battery cell and the transfer of heat to the inside of the battery cell.

[0036] In a further preferred embodiment, such as Figure 3 As shown:

[0037] Limiting rods 11 are fixed around the bottom of the jig plate 2, and limiting holes 12 are opened on the top of the support plate 3. The bottom of the limiting rods 11 is slidably set in the limiting holes 12. Through the cooperation of the limiting rods 11 and the limiting holes 12, the jig plate 2 can be stably supported, preventing the jig plate 2 from tilting due to the displacement of the welding point position when the cell top cover is pressure welded, which could easily cause the welding point position on the cell top cover to shift again.

[0038] This device is equipped with a corresponding controller.

[0039] In practical use, select the matching fixture limiting frame 4 according to the required size of the battery cell top cover to be welded. Then, install the fixture limiting frame 4 on the top of the fixture support plate 2 by connecting the plug pin 7 and the plug hole 8. Then, adjust the position of the support plate 3 according to the thickness of the battery cell top cover. The electric push rod 5 drives the support plate 3 to move up and down. Then, the fixture support plate 2 moves up and down together to place the battery cell top cover in the fixture limiting frame 4. Then, use the welding gun to apply pressure to the welding point of the battery cell top cover for welding. After the welding gun squeezes the battery cell top cover, the battery cell top cover moves downward by squeezing the rubber column 6. The rubber column 6 provides elastic buffer protection for the fixture support plate 2. A lot of heat is generated when the welding gun welds the battery cell top cover. If the heat is not separated from the battery cell top cover in time, it can easily interfere with the internal structure of the battery cell. Start the exhaust fan 9 to quickly dissipate the internal heat to the outside to reduce the temperature of the battery cell.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding fixture for battery cell top covers, characterized in that, include: Fixture base (1); The top of the fixture base (1) is provided with a storage cavity, and a fixture tray (2) and a support plate (3) are movably arranged in the storage cavity from top to bottom. A fixture limiting frame (4) for limiting different top covers is installed on the outer periphery of the top of the fixture tray (2). The fixture tray (2) and the support plate (3) are connected by an elastic buffer assembly. The fixture base (1) is also provided with a heat dissipation component for dissipating the high temperature generated during welding.

2. The cell top cover welding fixture according to claim 1, characterized in that: Four sets of electric actuators (5) are fixed around the bottom of the fixture base (1). The piston rod of the electric actuator (5) passes through the storage cavity and is fixedly connected to the bottom of the support plate (3). The four sets of electric actuators (5) are used in conjunction with the grating ruler.

3. The cell top cover welding fixture according to claim 1, characterized in that: The elastic buffer assembly includes a rubber column (6) located between the support plate (3) and the fixture support plate (2), with both ends of the rubber column (6) being bonded to the fixture support plate (2) and the support plate (3) respectively.

4. The cell top cover welding fixture according to claim 1, characterized in that: The bottom of the fixture limiting frame (4) is fixed with a plug-in post (7), and the top of the fixture support plate (2) is provided with a plug-in hole (8). The plug-in post (7) and the plug-in hole (8) are used together.

5. The cell top cover welding fixture according to claim 1, characterized in that: The heat dissipation assembly includes multiple sets of through holes opened on the side wall of the fixture base (1), and an exhaust fan (9) is installed in the through holes. The fixture support plate (2) is provided with a through groove (10) that cooperates with the top cover.

6. The cell top cover welding fixture according to claim 1, characterized in that: Limiting rods (11) are fixed around the bottom of the fixture plate (2), and limiting holes (12) are opened on the top of the support plate (3). The bottom of the limiting rods (11) is slidably disposed in the limiting holes (12).

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