Anti-deformation device for welding explosion-proof valve of battery cover plate

Abstract

The utility model discloses an anti-deformation device for welding an anti-explosion valve of a battery cover plate, and belongs to the field of welding of battery cover plates. Comprising a supporting seat, a base, a pressing plate, a pressing block and a power assembly. By arranging the base and the pressing plate with the pressing block, during welding, the pressing plate drives the pressing block to move downwards, so that the pressing block is matched with the base to firmly press and fix the substrate, controllable downward pressure is applied in real time in the welding process, deformation caused by thermal stress is actively counteracted, and therefore the situation that the substrate deforms in the welding process can be effectively prevented; and correction treatment after deformation is not needed. Therefore, the flatness deviation of the substrate after the explosion-proof valve is welded can be ensured to be less than or equal to 0.1 mm, and the explosion pressure stability (deviation lt; 5%). And the contact area of the substrate, the base and the pressing block is guaranteed, the heat dissipation efficiency can be guaranteed, stress residues caused by cold and hot changes in the welding process are greatly reduced, and deformation in the subsequent use process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery cover welding, and in particular to an anti-deformation device for welding explosion-proof valves on battery covers. Background Technology

[0002] In new energy battery systems (especially lithium-ion power batteries), the battery cover plays a crucial structural and functional role as a key component of the battery pack. As the core sealing component of the power battery pack, the battery cover directly affects the safety (explosion-proof, waterproof, dustproof) and lifespan (prevention of electrolyte leakage, prevention of gas penetration) of the battery system. Modern battery covers are mostly multi-layered composite structures (such as aluminum shell + insulating sealing ring + explosion-proof valve), and the flatness of their sealing surface, weld quality (laser welding / FSW), and assembly precision directly affect the battery's airtightness.

[0003] The cover plates of new energy batteries typically require the welding of explosion-proof valves to ensure that the battery can safely release pressure and prevent explosion under abnormal conditions (such as overpressure or overheating). However, there is a critical problem in the welding process of the explosion-proof valves: welding thermal stress causes deformation of the substrate, which in turn seriously affects the quality of the subsequent battery cover plates.

[0004] Explosion-proof valves are typically fixed to the battery cover using laser welding or resistance welding. The high localized temperatures during welding cause the metal to expand thermally and contract upon cooling, resulting in residual stress. Since the explosion-proof valve is usually located in the center or a critical position of the cover, welding stress can cause the cover (especially thin covers, less than 1mm thick) to warp, dent, or waviness, affecting battery sealing and structural strength. Severe deformation can cause the explosion-proof valve's opening pressure to deviate from the design value and even affect the assembly accuracy of the battery module.

[0005] When welding deformation occurs, the current approach is typically post-weld straightening (post-processing correction), which involves correcting the deformation using mechanical flattening or heat treatment after welding. However, this method requires secondary processing, which may damage the sensitive structure of the explosion-proof valve, leading to microcracks or metal fatigue, affecting its burst accuracy. Furthermore, residual stress may remain after straightening, potentially causing re-deformation after long-term use. Additionally, this increases production steps and reduces efficiency, making it unsuitable for large-scale mass production. Therefore, preventing substrate deformation during the welding of explosion-proof valves is a pressing issue that needs to be addressed. Utility Model Content

[0006] This invention provides an anti-deformation device for welding explosion-proof valves on battery cover plates, which can solve the problem of substrate deformation caused by stress during the welding of explosion-proof valves in the prior art.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A deformation-resistant device for welding explosion-proof valves on battery cover plates, comprising:

[0009] Support base;

[0010] A base, the top surface of which is provided with at least one placement position for accommodating a substrate;

[0011] A pressure plate, which is disposed above the base;

[0012] A pressure block is fixedly disposed on the bottom surface of the pressure plate, and an avoidance notch is provided thereon;

[0013] A power assembly, which is fixedly mounted on the support base, is used to drive the pressure plate closer to / away from the base.

[0014] In one embodiment of this utility model: a guide structure is provided on the support base, and the pressure plate is slidably connected to the support base through the guide structure.

[0015] In one embodiment of this utility model: the guide structure includes a slide rail and a slider that are slidably connected, the slide rail is fixedly mounted on the support base, and the slider is fixedly mounted on the pressure plate.

[0016] In one embodiment of this utility model: a first limiting member is provided on the support base, and the first limiting member is located below the pressure plate.

[0017] In one embodiment of this utility model: a second limiting member is provided on the support base, and the second limiting member is located above the pressure plate.

[0018] In one embodiment of this utility model: a buffer element is provided on the support base, and the buffer element is located above the pressure plate.

[0019] In one embodiment of this utility model: the base is fixedly mounted on the tray, and the bottom of the tray is provided with a rotating shaft, which is located on the side below the pressure plate.

[0020] In one embodiment of this utility model: the top surface of the base is provided with a positioning notch.

[0021] In one embodiment of this utility model, the material of the pressing block is copper.

[0022] In one embodiment of this utility model: the power component is a cylinder.

[0023] The anti-deformation device for welding explosion-proof valves for battery cover plates according to this utility model has at least one of the following technical effects:

[0024] By using a pressure plate with a base and a pressure block, the pressure plate moves the pressure block downwards during welding, allowing the pressure block to firmly press and fix the substrate in conjunction with the base. Controllable downward pressure is applied in real-time during welding to actively counteract deformation caused by thermal stress. This effectively prevents substrate deformation during welding, eliminating the need for post-weld correction. This ensures that the flatness deviation of the substrate after welding is ≤0.1mm (compared to ≥0.3mm using traditional methods), guaranteeing burst pressure stability (deviation <5%). Furthermore, the contact area between the substrate and the base / pressure block is guaranteed, ensuring efficient heat dissipation and significantly reducing residual stress caused by thermal changes during welding, preventing deformation during subsequent use. The pressure applied to the substrate by the pressure plate and pressure block can be adjusted by changing the cylinder's air supply pressure. Preferably, the pressure applied to the substrate and explosion-proof valve can change synchronously with the welding heat input to control the amount of deformation after welding. This solution eliminates substrate deformation during welding, preventing secondary stress damage to the sensitive structure of the explosion-proof valve. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood in conjunction with the following description of the embodiments with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Wherein:

[0026] Figure 1 A three-dimensional structural diagram of an anti-deformation device for welding explosion-proof valves on battery covers provided by this utility model;

[0027] Figure 2 This utility model provides an anti-deformation device for welding explosion-proof valves on battery cover plates. Figure 1 Top view of the structure;

[0028] Figure 3 This utility model provides an anti-deformation device for welding explosion-proof valves on battery cover plates. Figure 1 A schematic diagram of the structure from the front view;

[0029] Figure 4 A three-dimensional structural diagram of the support base portion in an anti-deformation device for welding explosion-proof valves on battery covers, provided by this utility model;

[0030] Figure 5 This utility model provides a three-dimensional structural diagram of the base and pressure block mating part in an anti-deformation device for welding explosion-proof valves on battery covers.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Support base; 2. Base; 3. Pressure plate; 4. Pressure block; 5. Power component; 6. Guide structure; 7. First limiting component; 8. Second limiting component; 9. Buffer component; 10. Positioning notch. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] like Figure 1-5 As shown in the figure, this utility model provides an anti-deformation device for welding explosion-proof valves on battery cover plates, including a support base 1, a base 2, a pressure plate 3, a pressure block 4, and a power component 5. The top surface of the base 2 has at least one placement position for accommodating a substrate; the pressure plate 3 is positioned above the base 2; the pressure block 4 is fixedly disposed on the bottom surface of the pressure plate 3, and has a clearance notch for avoiding and placing the explosion-proof valve; the power component 5 is fixedly disposed on the support base 1 and is used to drive the pressure plate 3 closer to / away from the base 2. The bottom surface of the pressure block 4 and the top surface of the base 2 may have notches or positioning structures for positioning and limiting the substrate and explosion-proof valve to be processed.

[0035] Please see Figure 1-5 In one embodiment of this utility model, a guide structure 6 may be provided on the support base 1, and the pressure plate 3 is slidably connected to the support base 1 through the guide structure 6. The guide structure 6 may be a slide rail guide structure 6, or a guide rod / sleeve guide structure 6. As an example, the guide structure 6 includes a slide rail and a slider that are slidably connected. The slide rail is fixedly mounted on the support base 1, and the slider is fixedly mounted on the pressure plate 3. The pressure plate 3 slides with the support base 1 through the slide rail and the slider to ensure its stability.

[0036] Please see Figure 1-5In one embodiment of this utility model, a first limiting member 7 may be provided on the support base 1, and the first limiting member 7 is located below the pressure plate 3. A second limiting member 8 is provided on the support base 1, and the second limiting member 8 is located above the pressure plate 3. The limiting members are used to limit the extreme positions of the pressure plate 3 during downward and upward movement. The limiting member can be a bolt structure that is threaded into the support base 1, with the bolt head located on the side close to the pressure plate 3. In this way, the pressure plate 3 is limited by the bolt head, and the threaded bolt structure can rotate to adjust the position of the bolt head up and down when needed.

[0037] Please see Figure 1-5 In one embodiment of this utility model, a buffer member 9 is provided on the support base 1. The buffer member 9 is located above the pressure plate 3 and is used to buffer the pressure plate 3 during its upward movement, reducing impact. The buffer member 9 can be an elastic member or a pneumatic buffer member 9. As an example, the buffer member 9 includes a buffer head, a buffer rod, and a buffer seat. The buffer seat is fixedly mounted on the support base 1 and contains a buffer spring. One end of the buffer rod is slidably mounted inside the buffer seat, and the other end is fixedly connected to the buffer head. The buffer head can be made of a flexible material, such as rubber.

[0038] Please see Figure 1-5 In one embodiment of this utility model, the base 2 can be fixedly mounted on a tray, and a rotating shaft is provided at the bottom of the tray, with the rotating shaft located on the side below the pressure plate 3. Thus, during use, the base 2 can be rotated to the outside by rotating the tray for easy loading and unloading of materials. After the materials are placed, the base 2 can be moved under the pressure plate 3 by rotating the tray for further operations. Two or more bases 2 can also be provided, allowing them to function alternately and improving efficiency.

[0039] Please see Figure 1-5 In one embodiment of this utility model, the top surface of the base 2 may be provided with a positioning notch 10. This notch can be used for positioning when placing the substrate, and it also facilitates the removal of the substrate. The pressure block 4 can be made of copper. By using copper as the pressure block 4, thermal conductivity can be ensured, allowing for rapid heat dissipation during the welding process and reducing residual stress caused by temperature changes during welding. The power component 5 can be a cylinder, which is fixedly mounted on the support base 1. The free end of the piston rod is fixedly connected to the pressure plate 3 via a connecting rod for transmitting power.

[0040] The working principle of this utility model:

[0041] The product to be processed is placed on the base 2, and then the base 2 is moved below the pressure plate 3. The power component 5 drives the pressure plate 3 downwards, causing the pressure block 4 to abut against the top surface of the substrate. The pressure block 4 and the base 2 cooperate to press and fix the substrate. Then, the explosion-proof valve welding process is performed. After welding is completed and heat dissipation is ensured, the power component 5 drives the pressure plate 3 upwards, causing the pressure block 4 to detach from the base 2. The base 2 is then moved to the outside, and the welded product is removed. By using the pressure plate 3 with the base 2 and the pressure block 4, during welding, the pressure plate 3 drives the pressure block 4 downwards, allowing the pressure block 4 to firmly press and fix the substrate with the base 2. Controllable downward pressure is applied in real time during welding, actively counteracting deformation caused by thermal stress. This effectively prevents substrate deformation during welding, eliminating the need for post-deformation correction. This ensures that the flatness deviation of the substrate after explosion-proof valve welding is ≤0.1mm (compared to ≥0.3mm using traditional methods), guaranteeing the stability of the burst pressure (deviation <5%). Furthermore, the contact area between the substrate and the base 2 and pressure block 4 is guaranteed, ensuring efficient heat dissipation and significantly reducing residual stress caused by thermal changes during welding, thus preventing deformation during subsequent use. By changing the air supply pressure of the cylinder, the pressure applied to the substrate by the pressure plate 3 and pressure block 4 can be adjusted according to actual conditions. Preferably, the pressure applied to the substrate and explosion-proof valve can change synchronously with the welding heat input to control the change in deformation after welding. Through the above scheme, substrate deformation is eliminated during the welding process, avoiding secondary stress damage to the sensitive structure of the explosion-proof valve.

[0042] The foregoing has provided a detailed description of one embodiment of the present invention, but the description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the scope of the claims of the present invention.

[0043] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A deformation-resistant device for welding explosion-proof valves on battery cover plates, characterized in that, include: Support base; A base, the top surface of which is provided with at least one placement position for accommodating a substrate; A pressure plate, which is disposed above the base; A pressure block is fixedly disposed on the bottom surface of the pressure plate, and an avoidance notch is provided thereon; A power assembly, which is fixedly mounted on the support base, is used to drive the pressure plate closer to / away from the base.

2. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, The support base is provided with a guide structure, and the pressure plate is slidably connected to the support base through the guide structure.

3. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 2, characterized in that, The guide structure includes a slide rail and a slider that are slidably connected. The slide rail is fixedly mounted on the support base, and the slider is fixedly mounted on the pressure plate.

4. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, The support base is provided with a first limiting member, which is located below the pressure plate.

5. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, The support base is provided with a second limiting member, which is located above the pressure plate.

6. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, A buffer element is provided on the support base, and the buffer element is located above the pressure plate.

7. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, The base is fixedly mounted on the tray, and the bottom of the tray is provided with a pivot, which is located on the side below the pressure plate.

8. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, The top surface of the base is provided with a positioning notch.

9. The anti-deformation device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, The material of the pressing block is copper.

10. A deformation-resistant device for welding explosion-proof valves on battery cover plates according to claim 1, characterized in that, The power unit is a cylinder.

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