Clamp for sealing nail welding of square cell

Abstract

The utility model provides a square cell sealing nail welding with anchor clamps, including bottom plate, and set up in the bottom plate's benchmark fixed plate, floating fixed plate, intermediate fixed plate, long side fixed plate and cushion block, wherein: benchmark fixed plate with floating fixed plate opposite setting, intermediate fixed plate with long side fixed plate opposite setting, floating fixed plate at least partial can be close to or far from benchmark fixed plate, long side fixed plate at least partial can be close to or far from intermediate fixed plate, cushion block is used for supporting the battery, and the cushion block is between intermediate fixed plate and long side fixed plate, first guide shaft is configured on the cushion block, first guide shaft with bottom plate sliding connection is established, and first buffer spring is configured between the cushion block and bottom plate. The utility model discloses cushion block floating assembly, can avoid welding plate and battery hard contact, and can eliminate the longitudinal assembly error of battery simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a clamp for welding sealing nails for square-shell batteries. Background Technology

[0002] Sealing pin welding is the final step in battery manufacturing, signifying the completion of battery production. Therefore, any defects or scrapping during this process incurs high costs. During sealing pin welding, the battery needs to be clamped and positioned using fixtures, and longitudinally, a welding plate is required to press the battery firmly to maintain a stable welding posture and eliminate longitudinal assembly errors. However, in conventional fixture assembly, the welding plate makes hard contact with the battery during the pressing process, which can easily cause pressure damage. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a fixture for welding sealing nails of square-shell batteries, in which the pads are floatingly assembled, which can avoid hard contact between the welding plate and the battery, and at the same time eliminate the longitudinal assembly error of the battery.

[0004] The embodiments of this utility model are achieved through the following technical solutions:

[0005] A clamp for welding sealing nails to a square-shell battery includes a base plate, and a reference fixing plate, a floating fixing plate, an intermediate fixing plate, a long-side fixing plate, and a pad disposed on the base plate. The reference fixing plate and the floating fixing plate are disposed opposite to each other, the intermediate fixing plate and the long-side fixing plate are disposed opposite to each other, the floating fixing plate is at least partially able to approach or move away from the reference fixing plate, and the long-side fixing plate is at least partially able to approach or move away from the intermediate fixing plate. The pad is used to support the battery and is located between the intermediate fixing plate and the long-side fixing plate. A first guide shaft is disposed on the pad and slidably connected to the base plate. A first buffer spring is disposed between the pad and the base plate.

[0006] According to a preferred embodiment, the bottom of the pad is provided with a cover plate, and a buffer plate is detachably mounted on the side of the cover plate away from the pad. The first guide shaft is mounted on the buffer plate, passes through the bottom plate and is slidably connected to it, and the first buffer spring is disposed between the bottom plate and the buffer plate.

[0007] According to a preferred embodiment, a guide screw is mounted on the base plate, the guide screw passing through the buffer plate and slidably connected thereto; a buffer gap is provided between the top of the guide screw and the cover plate.

[0008] According to a preferred embodiment, the intermediate fixing plate and the long side fixing plate are located between the reference fixing plate and the floating fixing plate; when unlocking, the long side fixing plate and the floating fixing plate are linked together.

[0009] According to a preferred embodiment, the floating fixing plate includes a first base plate and a first floating plate. The first base plate is fixedly installed on the base plate, and the first floating plate is located between the first base plate and the reference fixing plate. A second guide shaft is mounted on the first floating plate, the second guide shaft passes through the first base plate and is slidably connected to it, and a tension plate is mounted on the free end of the second guide shaft. The clamp also includes a second base plate, the long side fixing plate is mounted on the second base plate, the end of the second base plate passes through the first base plate and extends outward, and a linkage block is mounted on the end of the second base plate. The linkage block is slidably connected to the first base plate and is located between the tension plate and the first base plate. When the second base plate drives the long side fixing plate away from the intermediate fixing plate, the linkage block drives the tension plate to move so that the first floating plate moves away from the reference fixing plate.

[0010] According to a preferred embodiment, a first spring is provided between the first base plate and the first floating plate, and the first spring acts on the first floating plate so that the first floating plate has a tendency to move toward the reference fixed plate.

[0011] According to a preferred embodiment, a first positioning plate is disposed on the first base plate, and a second spring is disposed between the first positioning plate and the linkage block. The second spring acts on the linkage block so that the second base plate has a tendency to move toward the intermediate fixed plate.

[0012] According to a preferred embodiment, the upper surface of the second base plate is provided with a guide groove, and the bottom of the long side fixing plate is provided with a guide slider adapted to the guide groove, the guide slider being embedded in the guide groove; the bottom of the guide groove is provided with a plurality of positioning screw holes spaced apart along a first direction, and the guide slider is provided with an adjustment groove corresponding to the positioning screw holes extending along the first direction, the long side fixing plate being able to move closer to or further away from the middle fixing plate along the first direction.

[0013] According to a preferred embodiment, an adjusting plate is disposed on the second base plate, the adjusting plate being located on the side of the long side fixed plate away from the middle fixed plate; an adjusting block is mounted on the middle fixed plate, the adjusting block being disposed on the side close to the adjusting plate; an adjusting screw is rotatably mounted on the adjusting plate, the axis of the adjusting screw being parallel to the first direction, and the adjusting screw being threadedly connected to the adjusting block.

[0014] According to a preferred embodiment, the linkage block includes a drive block, the end of which is provided with a roller, and an unlocking block is mounted on one side of the tensioning plate near the first base plate. The unlocking block is provided with a drive ramp adapted to the roller. In the locked state, the roller disengages from the drive ramp. When unlocked, the roller abuts against the drive ramp and acts on the drive ramp to drive the tensioning plate away from the reference fixed plate.

[0015] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0016] The present invention has a first buffer spring configured between the pad and the base plate, which can buffer the battery in the longitudinal direction, thereby avoiding hard contact between the welding plate and the battery, preventing the battery from being crushed, and eliminating longitudinal assembly errors of the battery during the gradual pressing process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural diagram of the clamp holding the battery provided in an embodiment of this utility model;

[0019] Figure 2 An exploded view of the fixture provided in this embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the assembly structure of the base plate, buffer plate and cover plate provided for an embodiment of this utility model;

[0021] Figure 4 A first exploded structural diagram of the floating fixing plate provided in an embodiment of this utility model;

[0022] Figure 5 A schematic diagram of the assembly structure of the floating fixing plate and the linkage block provided in an embodiment of this utility model;

[0023] Figure 6 An exploded view of the assembly structure of the drive block and unlocking block provided in an embodiment of this utility model;

[0024] Figure 7 This is a schematic diagram of the assembly structure of the welding plate and fixture provided in an embodiment of the present utility model.

[0025] Icons: 1. Fixture; 11. Base plate; 12. Reference fixing plate; 121. Second positioning plate; 13. Floating fixing plate; 131. First base plate; 1311. First positioning plate; 1312. Second spring; 1313. Third guide shaft; 132. First floating plate; 133. Tensioning plate; 1331. Unlocking block; 1332. Drive inclined plane; 134. Linear bearing; 135. Second guide shaft; 136. First spring; 14. Middle fixing plate; 15. Long side fixing plate; 151. Guide slider; 1511. Adjusting groove; 152. Adjusting block; 16. Two seats; 161, balance block; 162, unlocking plate; 163, guide groove; 1631, positioning screw hole; 164, adjusting plate; 165, adjusting screw; 17, linkage block; 171, connecting plate; 172, drive block; 1721, roller; 18, pad block; 181, first guide shaft; 182, first buffer spring; 183, guide screw; 184, cover plate; 185, buffer plate; 21, bracket; 22, pressure frame; 221, side plate; 222, welding plate; 2221, welding hole; a, battery; b, pressure block; c, buffer gap; X, first direction. Detailed Implementation

[0026] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] Please refer to Figures 1 to 7A fixture for welding sealing nails to a square-shell battery includes a base plate 11, and a reference fixing plate 12, a floating fixing plate 13, a middle fixing plate 14, a long-side fixing plate 15, and a pad 18 disposed on the base plate 11. The reference fixing plate 12 and the floating fixing plate 13 are arranged opposite each other, the middle fixing plate 14 and the long-side fixing plate 15 are arranged opposite each other, the floating fixing plate 13 can at least partially approach or move away from the reference fixing plate 12, the long-side fixing plate 15 can at least partially approach or move away from the middle fixing plate 14, and the middle fixing plate 18... Plate 14 and long-side fixing plate 15 are located between reference fixing plate 12 and floating fixing plate 13, and battery a is located between middle fixing plate 14 and long-side fixing plate 15; when unlocked, long-side fixing plate 15 is linked with floating fixing plate 13; pad 18 is used to support battery a, and pad 18 is located between middle fixing plate 14 and long-side fixing plate 15; a first guide shaft 181 is arranged on pad 18, the first guide shaft 181 is slidably connected to base plate 11, and a first buffer spring 182 is arranged between pad 18 and base plate 11.

[0030] In this embodiment, the base plate 11, the reference fixing plate 12, the floating fixing plate 13, the intermediate fixing plate 14, the long side fixing plate 15, and the pad block 18 together limit and form a space for accommodating the battery a. In the thickness direction of the battery a, the intermediate fixing plate 14 serves as a positioning reference; in the length direction of the battery a, the reference fixing plate 12 serves as a positioning reference. Under the action of the long side fixing plate 15 and the floating fixing plate 13, the intermediate fixing plate 14 and the reference fixing plate 12 work together to clamp and position the battery a. The structural design of the linkage between the long side fixing plate 15 and the floating fixing plate 13 can reduce the number of driving components and make the unlocking of battery a synchronous in the thickness and length directions. At the same time, the first buffer spring 182 is arranged between the pad block 18 and the base plate 11, which can buffer the battery a in the longitudinal direction. Specifically, when the sealing nail is welded, the first buffer spring 182 is compressed during the process of the welding plate 222 pressing down on the battery a, thereby avoiding hard contact between the welding plate 222 and the battery a, and preventing the battery a from being crushed. At the same time, during the gradual pressing process, the assembly error of the battery a in the longitudinal direction can be eliminated.

[0031] like Figure 7 As shown, a side plate 221 is mounted on the pressure frame 22. The side plate 221 is slidably connected to the bracket 21 via a slide rail slider and is driven to move longitudinally by a cylinder (not shown) mounted on the bracket 21. The welding plate 222 is detachably mounted on the pressure frame 22 by screws or bolts. In use, the pressure frame 22 moves downward relative to the bracket 21, causing the welding plate 222 to press down on the battery a, compressing the first buffer spring 182 for buffering. A welding hole 2221 is provided through the welding plate 222, corresponding to a sealing nail, for the laser beam to pass through.

[0032] Optionally, such as Figure 2As shown, a cover plate 184 is disposed at the bottom of the pad 18. A buffer plate 185 is detachably mounted on the side of the cover plate 184 away from the pad 18 by bolts or screws. A first guide shaft 181 is mounted on the buffer plate 185, that is, the first guide shaft 181 is mounted on the pad 18 through the buffer plate 185 and the cover plate 184, and the first guide shaft 181 passes through the base plate 11 and is slidably connected to it. A first buffer spring 182 is disposed between the base plate 11 and the buffer plate 185. In order to improve the stability of the movement of the combined structure of the cover plate 184 and the buffer plate 185, such as... Figure 2 As shown, a guide screw 183 is mounted on the base plate 11, passing through and slidably connecting to the buffer plate 185. Furthermore, a buffer gap c exists between the top of the guide screw 183 and the cover plate 184. In use, the guide screw 183 guides the combined structure of the cover plate 184 and the buffer plate 185, and the buffer gap c limits the maximum longitudinal buffer stroke of the combined structure, thus providing a stable hard limit for the battery a in the longitudinal direction while achieving a buffering effect. The width of the buffer gap c is the maximum longitudinal buffer stroke.

[0033] like Figure 1 , Figure 2 and Figure 4 As shown, the floating fixing plate 13 includes a first base plate 131 and a first floating plate 132. The first base plate 131 is fixedly installed on the base plate 11, and the first floating plate 132 is located between the first base plate 131 and the reference fixing plate 12. A second guide shaft 135 is mounted on the first floating plate 132. The second guide shaft 135 passes through the first base plate 131 and is slidably connected to it. A tensioning plate 133 is mounted on the free end of the second guide shaft 135. The clamp 1 also includes a second base plate 16, with its long side fixed. Plate 15 is mounted on a second base plate 16. The end of the second base plate 16 passes through the first base plate 131 and extends outward. A linkage block 17 is mounted on the end of the second base plate 16. The linkage block 17 is slidably connected to the first base plate 131 and is located between the tension plate 133 and the first base plate 131. When the second base plate 16 drives the long side fixing plate 15 away from the middle fixing plate 14, the linkage block 17 drives the tension plate 133 to move so that the first floating plate 132 moves away from the reference fixing plate 12. In this embodiment, a linear bearing 134 is mounted on the first base plate 131. A second guide shaft 135 installed between the tension plate 133 and the first floating plate 132 is slidably connected to the first base plate 131 through the linear bearing 134. The axial direction of the second guide shaft 135 is parallel to the length direction of the battery a, thereby enabling the first floating plate 132 to move closer to or further away from the reference fixing plate 12. Further, as Figure 4As shown, a first spring 136 is provided between the first base plate 131 and the first floating plate 132. The first spring 136 acts on the first floating plate 132, causing the first floating plate 132 to tend to move towards the reference fixed plate 12. When the first spring 136 is in a compressed state, it acts on the first floating plate 132 to achieve self-locking clamping of the battery a in its length direction.

[0034] In this embodiment, the linkage block 17 is slidably connected to the first base plate 131 via a slide rail slider assembly. The movement direction of the linkage block 17 relative to the first base plate 131 is consistent with the movement direction of the long side fixed plate 15 relative to the middle fixed plate 14.

[0035] like Figure 1 , Figure 2 and Figure 5 As shown, a first positioning plate 1311 is disposed on the first base plate 131, and a second spring 1312 is disposed between the first positioning plate 1311 and the linkage block 17. The second spring 1312 acts on the linkage block 17 so that the second base plate 16 tends to move towards the intermediate fixed plate 14. In this embodiment, the linkage block 17 includes a connecting plate 171 and a driving block 172 connected to each other. The connecting plate 171 is fixedly mounted on the end of the second base plate 16 and is slidably connected to the first base plate 131 through a slide rail slider assembly. The driving block 172 is mounted on the top of the connecting plate 171 and is used to cooperate with the tensioning plate 133 to drive the first floating plate 132, thereby unlocking the battery a in its length direction. The second spring 1312 is located between the first positioning plate 1311 and the connecting plate 171. Specifically, the second spring 1312 is in a compressed state, which acts on the connecting plate 171 so that the driving block 172 remains disengaged from the tension plate 133 in the locked state, so as to ensure the self-locking effect of the first floating plate 132.

[0036] To improve the stability of the movement of the connecting plate 171, i.e., the linkage block 17, such as Figure 5 As shown, a third guide shaft 1313 is mounted on the first positioning plate 1311, and a guide blind hole (not shown in the figure) adapted to the third guide shaft 1313 is provided on the connecting plate 171. The free end of the third guide shaft 1313 is embedded in the guide blind hole and is slidably connected to the hole wall of the guide blind hole. The axial direction of the third guide shaft 1313 is parallel to the direction of the long side fixing plate 15 towards or away from the middle fixing plate 14.

[0037] In some embodiments, such as Figure 6As shown, a roller 1721 is provided at the end of the drive block 172, and an unlocking block 1331 is mounted on the side of the tension plate 133 near the first base plate 131. The unlocking block 1331 is provided with a drive ramp 1332 adapted to the roller 1721. In the locked state, the roller 1721 disengages from the drive ramp 1332. When unlocking is required, the roller 1721 abuts against the drive ramp 1332 and acts on the drive ramp 1332 so that the tension plate 133 drives the first floating plate 132 away from the reference fixed plate 12, thereby realizing the unlocking of the battery a in the length direction.

[0038] like Figure 1 and Figure 2 As shown, one end of the second base plate 16 passes through the first base plate 131, and the other end of the second base plate 16 passes through the reference fixing plate 12. A balance block 161 is disposed at the end of the second base plate 16 near the reference fixing plate 12. The balance block 161 and the reference fixing plate 12 are slidably connected via a slide rail slider assembly. A second positioning plate 121 is disposed on the reference fixing plate 12. The combination structure of the second positioning plate 121 and the balance block 161 is the same as the combination structure of the first positioning plate 1311 and the connecting plate 171, which is used to balance and stabilize the movement of the second base plate 16, i.e., the long side fixing plate 15, as it moves closer to or away from the middle fixing plate 14. Specifically, a third guide shaft 1313 and a second spring 1312 are also disposed between the second positioning plate 121 and the horizontal block. Their functions are the same as those of the third guide shaft 1313 and the second spring 1312 disposed between the first positioning plate 1311 and the connecting plate 171, and will not be described in detail here. In this embodiment, the second spring 1312 also acts on the second base plate 16, and then on the long side fixing plate 15, so that it is in a self-locking state in the thickness direction of the battery a.

[0039] Specifically, in use, in the locked state, the second spring 1312 acts on the long side fixed plate 15 and the linkage block 17, so that the long side fixed plate 15 is in a self-locking state, and the roller 1721 on the linkage block 17 disengages from the driving inclined surface 1332, so that the first spring 136 can act on the first floating plate 132, so that the first floating plate 132 is in a self-locking state. At this time, the clamp 1 is in a self-locking state as a whole. When unlocking, the second seat plate 16 is driven away from the middle fixed plate 14 by external force. During the process, the connecting plate 171 and the balance block 161 compress the second spring 1312 accordingly, and the driving block 172 moves synchronously, so that the roller 1721 and the driving inclined surface 1332 abut and interact, so that the tensioning plate 133 and the first floating plate 132 move away from the reference fixed plate 12 synchronously. During this process, the first spring 136 is compressed, thereby realizing the unlocking of the clamp 1.

[0040] In some embodiments, an unlocking plate 162 is provided on the second base plate 16. It is understood that a combination structure similar to a cylinder (not shown in the figure) and a push block (not shown in the figure) is provided at the work station that needs to be unlocked. In use, the cylinder drives the push block to act on the unlocking plate 162 to drive the second base plate 16 to move and achieve unlocking.

[0041] like Figure 1 and 2 As shown, the upper surface of the second base plate 16 is provided with a guide groove 163, and the bottom of the long side fixing plate 15 is provided with a guide slider 151 adapted to the guide groove 163. The guide slider 151 is embedded in the guide groove 163. The bottom of the guide groove 163 is provided with a plurality of positioning screw holes 1631 spaced apart along the first direction X. The guide slider 151 is provided with an adjustment groove 1511 corresponding to the positioning screw holes 1631 extending along the first direction X. The long side fixing plate 15 can move closer to or further away from the middle fixing plate 14 along the first direction X. In this embodiment, the guide slider 151 can be finely adjusted in the guide groove 163 to realize the fine adjustment of the long side fixing plate 15 on the second base plate 16. In use, the guide slider 151 is fixed to the positioning screw hole 1631 by bolts or screws passing through the adjustment groove 1511.

[0042] like Figure 1 As shown, further, an adjusting plate 164 is disposed on the second base plate 16, and the adjusting plate 164 is located on the side of the long side fixed plate 15 away from the middle fixed plate 14; an adjusting block 152 is mounted on the middle fixed plate 14, and the adjusting block 152 is disposed on the side close to the adjusting plate 164; an adjusting screw 165 is rotatably mounted on the adjusting plate 164, the axis of the adjusting screw 165 is parallel to the first direction X, and the adjusting screw 165 is threadedly connected to the adjusting block 152. With this configuration, the long side fixed plate 15 can be finely adjusted by adjusting the adjusting screw 165 in conjunction with the adjusting block 152, so that the clamp 1 can be adapted to batteries a of different thicknesses.

[0043] In some embodiments, pressure blocks b are fitted onto the inner surfaces of the reference fixing plate 12, the first floating plate 132, the intermediate fixing plate 14, and the long side fixing plate 15. Each of these plates abuts against the battery a via its respective pressure block b. These pressure blocks b are detachably assembled using bolts or screws for easy replacement. Optionally, the pressure blocks b are made of rubber to prevent damage to the battery a.

[0044] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A fixture for welding sealing nails to a square-shell battery, characterized in that, Includes a base plate, and a reference fixing plate, a floating fixing plate, an intermediate fixing plate, a long-side fixing plate, and a pad block disposed on the base plate, wherein: The reference fixing plate and the floating fixing plate are arranged opposite to each other, the intermediate fixing plate and the long side fixing plate are arranged opposite to each other, the floating fixing plate can at least partially approach or move away from the reference fixing plate, the long side fixing plate can at least partially approach or move away from the intermediate fixing plate, the pad is used to support the battery, and the pad is located between the intermediate fixing plate and the long side fixing plate; The pad is provided with a first guide shaft, which is slidably connected to the base plate, and a first buffer spring is provided between the pad and the base plate.

2. The fixture for welding sealing nails for square-shell batteries according to claim 1, characterized in that, The bottom of the pad is provided with a cover plate, and a buffer plate is detachably mounted on the side of the cover plate away from the pad. The first guide shaft is installed on the buffer plate, passes through the bottom plate and is slidably connected to it, and the first buffer spring is disposed between the bottom plate and the buffer plate.

3. The fixture for welding sealing nails for square-shell batteries according to claim 2, characterized in that, The base plate is equipped with a guide screw, which passes through the buffer plate and is slidably connected to it; there is a buffer gap between the top of the guide screw and the cover plate.

4. The fixture for welding sealing nails for square-shell batteries according to claim 1, characterized in that, The intermediate fixing plate and the long side fixing plate are located between the reference fixing plate and the floating fixing plate; When unlocking, the long side fixing plate and the floating fixing plate work together.

5. The fixture for welding sealing nails for square-shell batteries according to claim 1, characterized in that, The floating fixing plate includes a first base plate and a first floating plate. The first base plate is fixedly installed on the base plate, and the first floating plate is located between the first base plate and the reference fixing plate. A second guide shaft is mounted on the first floating plate. The second guide shaft passes through the first base plate and is slidably connected to it. A tension plate is mounted on the free end of the second guide shaft. The clamp also includes a second base plate, the long side fixing plate is assembled on the second base plate, the end of the second base plate passes through the first base plate and extends outward, the end of the second base plate is equipped with a linkage block, the linkage block is slidably connected to the first base plate, and the linkage block is located between the tensioning plate and the first base plate; When the second base plate drives the long side fixed plate away from the middle fixed plate, the linkage block drives the tension plate to move so that the first floating plate moves away from the reference fixed plate.

6. The fixture for welding sealing nails for square-shell batteries according to claim 5, characterized in that, A first spring is provided between the first base plate and the first floating plate. The first spring acts on the first floating plate so that the first floating plate tends to move toward the reference fixed plate.

7. The fixture for welding sealing nails for square-shell batteries according to claim 5, characterized in that, A first positioning plate is disposed on the first base plate, and a second spring is disposed between the first positioning plate and the linkage block. The second spring acts on the linkage block so that the second base plate tends to move toward the intermediate fixed plate.

8. The fixture for welding sealing nails for square-shell batteries according to claim 5, characterized in that, The upper surface of the second base plate is provided with a guide groove, and the bottom of the long side fixing plate is provided with a guide slider that is adapted to the guide groove, and the guide slider is embedded in the guide groove; The bottom of the guide slide is provided with a plurality of positioning screw holes spaced apart along the first direction, and the guide slider is provided with an adjustment groove corresponding to the positioning screw holes extending along the first direction. The long side fixing plate can move closer to or further away from the middle fixing plate along the first direction.

9. The fixture for welding sealing nails for square-shell batteries according to claim 8, characterized in that, An adjustment plate is provided on the second base plate, and the adjustment plate is located on the side of the long side fixed plate away from the middle fixed plate; An adjusting block is mounted on the intermediate fixed plate. The adjusting block is located near the adjusting plate. An adjusting screw is rotatably mounted on the adjusting plate. The axis of the adjusting screw is parallel to the first direction. The adjusting screw is threadedly connected to the adjusting block.

10. The fixture for welding sealing nails for square-shell batteries according to claim 5, characterized in that, The linkage block includes a drive block, and a roller is provided at the end of the drive block. An unlocking block is mounted on one side of the tensioning plate near the first base plate. The unlocking block is provided with a drive ramp adapted to the roller. In the locked state, the roller disengages from the drive ramp. When unlocked, the roller abuts against the drive ramp and acts on the drive ramp to drive the tensioning plate away from the reference fixed plate.

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