Welding clamping mechanism and welding device

Abstract

The welding clamping mechanism comprises a supporting block, a clamping assembly and a limiting assembly, the supporting block is provided with a clamping groove penetrating through two opposite standard faces of the supporting block, the part, forming the clamping groove, of the supporting block is provided with a first face, a second face and a third face which are sequentially connected, and the first face is opposite to the third face. The first surface is used for contacting with the side surface of the single battery, the second surface is used for contacting with the top surface of the single battery, and the standard surface, the first surface and the second surface are respectively in a flat state; the clamping assembly is connected with the supporting block and inserted into the clamping groove, and the clamping assembly is used for jacking the single battery; the limiting assembly is connected with the supporting block, and the limiting assembly and the standard face are used for clamping the chip together. Compared with the prior art, the single batteries and the chips are fixed through the clamping assemblies and the limiting assemblies correspondingly, the single batteries and the chips are parallel to each other, so that the chips can be horizontally welded to the single batteries, and the problem that positioning of the chips is not accurate is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a welding clamping mechanism and welding device. Background Technology

[0002] Tensile and torsional tests on battery cell terminals are crucial steps in battery manufacturing and testing. They primarily assess the reliability and durability of the terminals in practical use, playing a vital role in battery research and development and contributing to improved overall battery performance and safety. Current technology typically mounts the battery cell onto a fixture with a welding plate, which is then welded to the cell. The terminal's test parameters are obtained by testing the torsional angle of the welding plate. However, current welding personnel often lack precise positioning of the welding plate on the fixture, relying solely on tactile judgment. This results in a deviation of one to two degrees between the actual and intended positioning of the welding plate. Utility Model Content

[0003] One objective of this invention is to provide a welding clamping mechanism and welding device, which aims to solve the technical problem that inaccurate positioning of the electrode plate affects the torsion test data of the electrode column.

[0004] To achieve the above objectives, the present invention provides a welding clamping mechanism, comprising a support block, a clamping assembly, and a limiting assembly. The support block has a clamping groove penetrating its two opposing standard surfaces. The portion of the support block forming the clamping groove has a first surface, a second surface, and a third surface connected in sequence. The first surface and the third surface are opposite to each other. The first surface is used to contact the side of the single battery cell, and the second surface is used to contact the top surface of the single battery cell. The standard surfaces, the first surface, and the second surface are all in a flat state. The clamping assembly is connected to the support block and inserted into the clamping groove. The clamping assembly is opposite to the first surface and is used to hold the single battery cell. The limiting assembly is connected to the support block, and the limiting assembly and the standard surface are used to jointly clamp the battery plate.

[0005] Optionally, the flatness of the standard surface is A1, 0 ≤ A1 ≤ 0.05, the flatness of the first surface is A2, 0 ≤ A2 ≤ 0.05, and the flatness of the second surface is A3, 0 ≤ A3 ≤ 0.05.

[0006] Optionally, the clamping assembly includes a screw and a spacer, the screw passing through the third surface and threadedly connected to the support block, and the screw being inserted into the clamping groove and connected to the spacer.

[0007] Optionally, the limiting component includes a limiting block, a guide rod, and a fastener. The guide rod passes through the limiting block and the support block in sequence, and the fastener passes through the limiting block and the support block and connects them. The limiting block and the standard surface are used to jointly clamp the bar plate.

[0008] Optionally, the limiting assembly further includes multiple linear bearings, the limiting block has a first fixing hole, the support block has a second fixing hole, the multiple linear bearings are respectively interference-fitted with the first fixing hole and the second fixing hole, and the guide rod is respectively slidingly fitted with the multiple linear bearings.

[0009] Optionally, the limiting component further includes a baffle plate disposed at at least one end of the guide rod, the baffle plate being used to prevent the guide rod from disengaging from the limiting block or the support block.

[0010] Optionally, the limiting assembly further includes an adjusting spring, through which the fastener passes and is compressed between the end of the fastener and the limiting block.

[0011] Optionally, the limiting assembly further includes an adjusting spring and a tension plate, the fastener passes through the tension plate, the limiting block has a limiting groove, the adjusting spring is assembled in the limiting groove, and the adjusting spring is compressed between the tension plate and the limiting block.

[0012] Optionally, the number of limiting components is at least two, and the at least two limiting components are respectively disposed on opposite sides of the support block.

[0013] To achieve the above objectives, the present invention provides a solution: a welding device, which includes a welder and a welding clamping mechanism of any of the above, wherein the welding clamping mechanism is used to clamp a single cell and a battery plate, and the welder is used to weld the battery plate and the single cell together.

[0014] The beneficial effects of this utility model are as follows: This utility model provides a welding clamping mechanism and welding device. The welding clamping mechanism includes a support block, a clamping component, and a limiting component. The support block has a clamping groove that passes through its two opposing standard surfaces. The part of the support block forming the clamping groove has a first surface, a second surface, and a third surface connected in sequence. The first surface and the third surface are opposite each other. The first surface is used to contact the side of the single cell, and the second surface is used to contact the top surface of the single cell. The standard surfaces, the first surface, and the second surface are all in a flat state. The clamping component is connected to the support block and inserted into the clamping groove. The clamping component is opposite to the first surface and is used to hold the single cell. The limiting component is connected to the support block, and the limiting component and the standard surface are used to jointly clamp the electrode plate. Compared with the prior art, this application achieves the fixation of the single cell and the electrode plate by using the clamping component and the limiting component respectively. After the electrode plate is positioned, the single cell and the electrode plate are parallel to each other, so that the electrode plate can be horizontally welded to the single cell, solving the problem of inaccurate electrode plate positioning. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the assembly structure of the welding device provided by this utility model;

[0017] Figure 2 This is a schematic diagram of the welding clamping mechanism provided by this utility model;

[0018] Figure 3 This is another structural schematic diagram of the welding clamping mechanism provided by this utility model;

[0019] Figure 4 This is a cross-sectional schematic diagram of the welding clamping mechanism provided by this utility model;

[0020] Figure 5 This is another cross-sectional schematic diagram of the welding clamping mechanism provided by this utility model.

[0021] Reference numerals: 100, welding clamping mechanism; 200, plate; 300, single cell; 10, support block; 101, standard surface; 102, first surface; 103, second surface; 104, third surface; 105, clamping groove; 106, second fixing hole;

[0022] 20. Clamping assembly; 201. Screw; 202. Spacer;

[0023] 30. Limiting component; 301. Limiting block; 302. Guide rod; 303. Fastener; 304. Linear bearing; 305. First fixing hole; 306. Baffle; 307. Adjusting spring; 308. Tensioning plate; 309. Clamping groove; 3011. Limiting groove. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1 The present invention provides a welding device, which includes a welding clamping mechanism 100 and a welder (not shown in the figure). The welding clamping mechanism 100 is used to clamp the single cell 300 and the foil 200, and the welder is used to weld the foil 200 and the single cell 300 together.

[0026] In practical applications, in order to evaluate the mechanical performance and reliability of batteries, especially their performance under physical stress conditions that may be encountered during use, torsion and tensile tests need to be performed on individual cells 300 during the battery manufacturing process. Torsion and tensile tests can simulate these conditions and evaluate whether the battery structure can remain intact under physical stress conditions.

[0027] Specifically, the single cell 300 and the electrode plate 200 are welded together. When the single cell 300 is torn and stretched, the welded electrode plate 200 will also be subjected to stress and deform. The operator obtains the test data of the single cell 300 by comparing the torsion angle caused by the deformation of the electrode plate 200, and thus obtains the mechanical properties of the single cell 300. Therefore, the welding angle of the electrode plate 200 needs to be very precise to ensure that the electrode plate 200 is in the correct position; otherwise, the positioning deviation of the electrode plate 200 will affect the test data.

[0028] Based on this, this application provides a welding clamping mechanism 100, which is used to clamp the single cell 300 and the foil 200 respectively, so that the foil 200 can be precisely aligned with the single cell 300 and avoid deviation of the welding angle of the foil 200.

[0029] Please see Figure 2The aforementioned welding clamping mechanism 100 includes a support block 10, a clamping assembly 20, and a limiting assembly 30. The support block 10 has a clamping groove 105 that passes through its two opposing standard surfaces 101. The portion of the support block 10 forming the clamping groove 105 has a first surface 102, a second surface 103, and a third surface 104 connected in sequence. The first surface 102 and the third surface 104 are opposite to each other. The first surface 102 is used to contact the side of the single cell 300, and the second surface 103 is used to contact the top surface of the single cell 300. The standard surfaces 101, the first surface 102, and the second surface 103 are all in a flat state. The clamping assembly 20 is connected to the support block 10 and inserted into the clamping groove 105. The clamping assembly 20 is opposite to the first surface 102 and is used to hold the single cell 300. The limiting assembly 30 is connected to the support block 10, and the limiting assembly 30 and the standard surfaces 101 are used to jointly clamp the bar sheet 200.

[0030] In practical applications, the support block 10 serves as the main support structure. The support block 10 has a clamping groove 105. The individual battery 300 extends into the clamping groove 105, and the top surface of the individual battery 300 contacts the second surface 103 in the clamping groove 105. The side surface of the individual battery 300 contacts the first surface 102 in the clamping groove 105. The clamping assembly 20 passes through the third surface 104 of the support block 10 and extends into the clamping groove 105, abutting against the individual battery 300, so as to press the individual battery 300 against the support block 10 and complete the positioning of the individual battery 300. The limiting component 30 and the support block 10 are connected. The bar sheet 200 is placed on the limiting component 30 and located between the standard surface 101 of the limiting component 30 and the support block 10. The limiting component 30 and the support block 10 together clamp the bar sheet 200 to complete the positioning of the bar sheet 200. After the bar sheet 200 is positioned, the bar sheet 200 is in contact with the top surface of the single cell 300 so that the welding machine can weld and fix the two together.

[0031] Furthermore, the standard surface 101, the first surface 102, and the second surface 103 are all in a flat state. The first surface 102, the second surface 103, and the standard surface 101 are usually perpendicular to each other. The second surface 103 is in contact with the top surface of the single cell 300. The electrode 200 is clamped between the standard surface 101 and the limiting block 301. Therefore, the electrode 200 is also in contact with the top surface of the single cell 300, so that the electrode 200 can be welded to the electrode post. After the electrode 200 is positioned, it is parallel to the second surface 103. The second surface 103 can be set as a horizontal plane. In this way, the welding surface between the single cell 300 and the electrode 200 is a horizontal plane, thus avoiding the angular deviation that would affect the test data during the welding of the electrode 200.

[0032] Compared with the prior art, this application uses clamping component 20 and limiting component 30 to fix the single cell 300 and the bar plate 200 respectively. After the bar plate 200 is positioned, the single cell 300 and the bar plate 200 are parallel to each other, so that the bar plate 200 can be horizontally welded to the single cell 300, thus solving the problem of inaccurate positioning of the bar plate 200.

[0033] It should be noted that the top surface of the single cell 300 specifically refers to the side with the terminal post, and the side surface of the single cell 300 specifically refers to the side adjacent to the top surface. Taking a square battery as an example, the side surface of the single cell 300 mentioned above refers to the side surface with the largest area of ​​the square battery. The plate 200 is usually welded to the terminal post and is used to test the tensile and torsional data of the terminal post.

[0034] In one embodiment, the flatness of the standard surface 101 is A1, 0≤A1≤0.05, the flatness of the first surface 102 is A2, 0≤A2≤0.05, and the flatness of the second surface 103 is A3, 0≤A3≤0.05.

[0035] In practical applications, a certain surface is usually used as the horizontal plane. Before the experiment, the electrode plate 200 can be set parallel to the horizontal plane. After the experiment, only the torsion angle of the electrode plate 200 relative to the horizontal plane needs to be measured to obtain the torsion data of the single cell 300. This setup simplifies the test and improves experimental efficiency. Therefore, the standard surface 101, the first surface 102, and the second surface 103 all need to be flat surfaces. Flat surfaces can avoid positioning deviations of the electrode plate 200 or the single cell 300. Using the second surface 103 as a reference surface, the second surface 103 contacts the top surface of the single cell 300. The second surface 103 can be used as a horizontal surface. The flatness A3 of the second surface 103 is between 0 and 0.05, for example, A3 is 0, 0.01, 0.02, 0.03, 0.04 or 0.05. That is to say, the deviation of the second surface 103 from the horizontal surface is between 0 and 0.05. Within this deviation range, the second surface 103 can be approximately horizontal. The top surface of the single cell 300 is attached to the second surface 103, which ensures the positioning accuracy of the single cell 300 when clamping.

[0036] Similarly, the flatness A1 of the standard surface 101 and the flatness A2 of the first surface 102 are both between 0 and 0.05. The deviation of the standard surface 101 and the first surface 102 from the ideal plane is between 0 and 0.05. The deviation angle within this range will not affect the actual test results. Therefore, as long as the position of the support block 200 relative to the standard surface 101 is fixed, the positioning accuracy of the support block 200 can be ensured, and the error tolerance of the support block 10 production design can be improved. For example, A1 can be 0, 0.01, 0.02, 0.03, 0.04 or 0.05, and A2 can be 0, 0.01, 0.02, 0.03, 0.04 or 0.05.

[0037] Please see Figure 3 The clamping assembly 20 includes a screw 201 and a spacer 202. The screw 201 passes through the third surface 104 and is threadedly connected to the support block 10. The screw 201 is inserted into the clamping groove 105 and connected to the spacer 202.

[0038] In practical applications, the screw 201 is threadedly connected to the support block 10, and a spacer 202 is connected to one end of the screw 201 that extends into the clamping groove 105. The operator rotates the screw 201, causing it to move the spacer 202, which in turn abuts against the individual battery 300 within the clamping groove 105, until the individual battery 300 is firmly pressed against the first surface 102, thus completing the clamping function of the individual battery 300. The screw 201 is easy to install and remove, convenient to adjust, highly flexible, and has a self-locking function to prevent accidental loosening and detachment. The separator 202 can protect the individual battery 300, prevent the screw 201 from directly contacting the individual battery 300, prevent short circuits, and provide electrical insulation. The separator 202 can also increase the contact area between the screw 201 and the individual battery 300, making the individual battery 300 more stable under force. The separator 202 also reduces the local stress on the individual battery 300 and protects the individual battery 300 from being squeezed and damaged by the screw 201.

[0039] It should be noted that spacer 202 can be made of a soft insulating material.

[0040] Please refer to it again. Figure 3 The limiting component 30 includes a limiting block 301, a guide rod 302, and a fastener 303. The guide rod 302 passes through the limiting block 301 and the support block 10 in sequence, and the fastener 303 passes through the limiting block 301 and the support block 10 for connection. The limiting block 301 and the standard surface 101 are used to jointly clamp the bar plate 200.

[0041] In practical applications, the guide rod 302 passes through the limiting block 301 and the support block 10 respectively. The guide rod 302 can be slidably connected to the support block 10 and locked to the limiting block 301. The guide rod 302 limits the movement direction of the limiting block 301, ensuring that the limiting block 301 moves in a preset direction and preventing the limiting block 301 from deviating. A clamping groove 309 is formed between the limiting block 301 and the standard surface 101 of the support block 10. The limiting block 301 moves closer to or further away from the support block 10 to adjust the size of the clamping groove 309. The clamping groove 309 is used to place the bar piece 200. The bar piece 200 is placed in the clamping groove 309, and the limiting block 301 is moved closer to the support block 10 so that the bar piece 200 is clamped between the limiting block 301 and the standard surface 101 of the support block 10. Then the fastener 303 is locked to restrict the movement of the limiting block 301 and complete the fixation of the bar piece 200. It is understandable that the fastener 303 can be a bolt or screw. When the limiting block 301 slides to the set position, the fastener 303 is threaded through the limiting block 301 and the support block 10 to lock the limiting block 301 and the support block 10, preventing the limiting block 301 from moving. Alternatively, the fastener 303 can be threaded through the limiting block 301 and the support block 10 first, and the distance between the limiting block 301 and the support block 10 can be controlled by adjusting the length of the fastener 303 screwed into the support block 10, thereby achieving the effect of adjusting the clamping groove 309.

[0042] It should be noted that the guide rod 302 can be fixed to the support block 10, and the limiting block 301 can be slidably set along the guide rod 302 to achieve the above-mentioned function.

[0043] Please refer to it again. Figure 3 The number of limiting components 30 is at least two, and at least two limiting components 30 are respectively arranged on opposite sides of the support block 10.

[0044] In practical applications, taking a prismatic battery as an example, a single cell 300 typically has positive and negative terminals. Therefore, both terminals need to be welded with tabs 200. To improve welding efficiency, limiting components 30 are set on both sides of the support block 10. After the clamping component 20 clamps the single cell 300, the limiting components 30 on both sides correspond to the two terminals of the single cell 300 respectively. One tab 200 is placed on each limiting component 30, and multiple tabs 200 can be welded at the same time, or after welding one side of tabs 200, the tabs 200 on the other side can be welded. With this setting, when welding multiple tabs 200 on the same single cell 300, the single cell 300 does not need to be re-clamped. Only the position of the limiting component 30 on the opposite side needs to be adjusted, avoiding repeated movement of the position of the single cell 300, which wastes time and affects the positioning accuracy of the single cell 300.

[0045] Please see Figure 4The limiting component 30 also includes multiple linear bearings 304. The limiting block 301 has a first fixing hole 305, and the support block 10 has a second fixing hole 106. The multiple linear bearings 304 are respectively interference-fitted with the first fixing hole 305 and the second fixing hole 106, and the guide rod 302 is respectively slidingly fitted with the multiple linear bearings 304.

[0046] In practical applications, the limiting components 30 can be configured in two sets. Limiting blocks 301 are provided on both opposite sides of the support block 10, dividing the limiting blocks 301 on both sides of the support block 10 into a left limiting block 301 and a right limiting block 301. Both the left and right limiting blocks 301 can move by sliding the guide rod 302. Specifically, taking the movement of the right limiting block 301 as an example, the left limiting block 301 has a first fixing hole 305, and the support block 10 has a second fixing hole 106. The guide rod 302 passes through the first fixing hole 305 and the second fixing hole 106 in sequence and is fixed together with the right limiting block 301. The guide rod 302 can slide within the first fixing hole 305 and the second fixing hole 106, thereby driving the right limiting block 301 to move, achieving the clamping effect of the right limiting block 301 on the bar plate 200.

[0047] To reduce wear caused by the sliding of the guide rod 302, linear bearings 304 are provided in both the first fixing hole 305 and the second fixing hole 106. The guide rod 302 passes through the linear bearings 304 and slides with them. The linear bearings 304 can provide very high positioning accuracy, ensuring that the guide rod 302 moves smoothly and accurately on the predetermined path, and reducing friction and wear of the guide rod 302.

[0048] It should be noted that the connection method of the left limiting block 301 is similar to that of the right limiting block 301. The right limiting block 301 has a first fixing hole 305, and the support block 10 has a second fixing hole 106. The guide rod 302 passes through the first fixing hole 305 and the second fixing hole 106 in sequence and is fixed together with the left limiting block 301.

[0049] Please refer to it again. Figure 4 The limiting component 30 also includes a baffle 306, which is disposed at at least one end of the guide rod 302. The baffle 306 is used to prevent the guide rod 302 from disengaging from the limiting block 301 or the support block 10.

[0050] In practical applications, to prevent the guide rod 302 from detaching from the limiting block 301 or the support block 10, a baffle 306 is provided at the end of the guide rod 302. If only one set of limiting components 30 is provided, one end of the guide rod 302 passes through the first fixing hole 305 and is slidably connected to the limiting block 301, and the other end passes through the second fixing hole 106 and is slidably connected to the support block 10. In order to prevent the guide rod 302 from detaching from the first fixing hole 305 and the second fixing hole 106, baffles 306 are provided at both ends of the guide rod 302. The baffles 306 restrict the guide rod 302 from detaching from the first fixing hole 305 or the second fixing hole 106.

[0051] If two sets of limiting components 30 are provided, the guide rod 302 has a first end and a second end. At this time, the first end of the guide rod 302 passes through the support block 10 and the limiting block 301 on one side in sequence, and the second end is locked to the limiting block 301 on the other side. Therefore, the guide rod 302 only needs to be provided with a baffle 306 at the first end to prevent the first end of the guide rod 302 from disengaging from the limiting block 301.

[0052] Please see Figure 4 and Figure 5 The limiting component 30 also includes an adjusting spring 307, through which the fastener 303 passes, and the adjusting spring 307 is compressed between the end of the fastener 303 and the limiting block 301.

[0053] In practical applications, one end of the fastener 303 passes through the adjusting spring 307 and the limiting block 301 in sequence, and connects to the support block 10. The other end of the fastener 303 abuts against the adjusting spring 307. The adjusting spring 307 can serve as a preload component, continuously applying a certain pressure after the fastener 303 is tightened, ensuring that the connection between the fastener 303 and the limiting block 301 always maintains an appropriate clamping force. This allows the limiting block 301 to generate a certain clamping force on the bar sheet 200, improving the stability of the bar sheet 200. Furthermore, the adjusting spring 307 also has a certain degree of elasticity and adjustability. By compressing the adjusting spring 307, the distance between the limiting block 301 and the support block 10 can be adjusted to accommodate bar sheets 200 of different widths.

[0054] Please refer to it again. Figure 4 and Figure 5 The limiting component 30 also includes a tension plate 308, a fastener 303 passing through the tension plate 308, a limiting block 301 with a limiting groove 3011, and an adjusting spring 307 assembled in the limiting groove 3011, with the adjusting spring 307 compressed between the tension plate 308 and the limiting block 301.

[0055] In practical applications, to enhance the clamping capacity of the limiting block 301 on the clamping plate 200, this application includes a tensioning plate 308. The fastener 303 abuts against the adjusting spring 307 via the tensioning plate 308. The tensioning plate 308 increases the contact area between the fastener 303 and the adjusting spring 307, resulting in a more even pressure distribution on the adjusting spring 307 and preventing direct contact between them, thus reducing wear on the adjusting spring 307 during movement. Furthermore, the increased contact area allows for multiple fasteners 303, which collectively abut against the adjusting spring 307 via the tensioning plate 308, increasing the fastening capacity of the fastener 303.

[0056] In one embodiment, the depth of the limiting groove 3011 should be less than the length of the adjusting spring 307. For example, the length of the adjusting spring 307 is 25mm and the depth of the limiting groove 3011 is 20mm. In this way, the adjusting spring 307 has an adjustment range of 5mm. The adjustment range of the adjusting spring 307 is limited by the depth of the limiting groove 3011, which effectively avoids the fastener 303 from over-compressing the adjusting spring 307, thereby causing the adjusting spring 307 to exceed its elastic limit and undergo permanent deformation.

[0057] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0058] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0059] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0060] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A welding clamping mechanism, said welding clamping mechanism for clamping a single cell and a battery cell, characterized in that, The welding clamping mechanism includes: The support block has a groove that passes through its two opposite standard surfaces. The part of the support block that forms the groove has a first surface, a second surface, and a third surface that are connected in sequence. The first surface and the third surface are opposite to each other. The first surface is used to contact the side of the single battery cell, and the second surface is used to contact the top surface of the single battery cell. The standard surfaces, the first surface, and the second surface are all in a flat state. A clamping assembly, connected to the support block and inserted into the clamping groove, the clamping assembly facing the first surface, the clamping assembly being used to hold the single battery cell; and A limiting component is connected to the support block, and the limiting component and the standard surface are used to jointly clamp the bar plate.

2. The welding clamping mechanism according to claim 1, characterized in that, The flatness of the standard surface is A1, 0≤A1≤0.05, the flatness of the first surface is A2, 0≤A2≤0.05, and the flatness of the second surface is A3, 0≤A3≤0.

05.

3. The welding clamping mechanism according to claim 1, characterized in that, The clamping assembly includes a screw and a spacer. The screw passes through the third surface and is threadedly connected to the support block. The screw is inserted into the clamping groove and connected to the spacer.

4. The welding clamping mechanism according to any one of claims 1 to 3, characterized in that, The limiting component includes a limiting block, a guide rod, and a fastener. The guide rod passes through the limiting block and the support block in sequence, and the fastener passes through the limiting block and the support block and connects them. The limiting block and the standard surface are used to clamp the bar plate together.

5. The welding clamping mechanism according to claim 4, characterized in that, The limiting assembly also includes multiple linear bearings. The limiting block has a first fixing hole, the support block has a second fixing hole, the multiple linear bearings are respectively interference-fitted with the first fixing hole and the second fixing hole, and the guide rod is respectively slidingly fitted with the multiple linear bearings.

6. The welding clamping mechanism according to claim 4, characterized in that, The limiting component further includes a baffle plate disposed at at least one end of the guide rod, the baffle plate being used to prevent the guide rod from disengaging from the limiting block or the support block.

7. The welding clamping mechanism according to claim 4, characterized in that, The limiting component also includes an adjusting spring, through which the fastener passes and is compressed between the end of the fastener and the limiting block.

8. The welding clamping mechanism according to claim 4, characterized in that, The limiting assembly also includes an adjusting spring and a tension plate. The fastener passes through the tension plate, the limiting block has a limiting groove, the adjusting spring is assembled in the limiting groove, and the adjusting spring is compressed between the tension plate and the limiting block.

9. The welding clamping mechanism according to any one of claims 1 to 3, characterized in that, The number of limiting components is at least two, and the at least two limiting components are respectively disposed on opposite sides of the support block.

10. A welding apparatus, characterized in that, The welding apparatus includes: a welder and a welding clamping mechanism as described in any one of claims 1 to 9, the welding clamping mechanism being used to clamp a single cell and a battery pack, and the welder being used to weld the battery pack and the single cell together.

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