Clamping device and welding tension detection apparatus

Abstract

The utility model discloses a kind of clamping device and welding tension detection equipment, belong to battery welding tension testing appliance field.The clamping device includes: tab clamp, connecting sheet clamp and mounting seat mechanism.When the tension test of tab and connecting sheet is carried out, tab clamp clamping mounting part applies tension, make tab produce displacement tendency away from connecting sheet.After tension increases, the welding surface between tab and connecting sheet can be subjected to vertical tensile stress, and the direction of adhesion force at welding surface is opposite;When tension reaches critical value, the welding place of tab and connecting sheet separates, at this time, tension value can reflect welding strength.Because tension direction is parallel to welding surface extension direction, and connecting sheet clamp can be parallel sliding adjustment position, therefore, it can ensure that tension is vertically applied to welding surface, reduce shear force or oblique force interference, can accurately evaluate ultrasonic welding strength, improve the accuracy and reliability of detection result.

Description

Technical Field

[0001] This utility model relates to the field of battery welding tensile testing instruments, and in particular to a clamping device and welding tensile testing equipment. Background Technology

[0002] With the development of new energy technologies, the requirements for battery processing quality are becoming increasingly stringent. In existing battery structures, battery electrodes, tabs, and connecting pieces are assembled sequentially by welding. The connecting pieces are used to connect the tabs to the battery casing or protection circuitry. This welding method typically employs ultrasonic welding, and the connection stability of the ultrasonically welded areas usually needs to be tested to ensure the reliability of the connection between the tabs and connecting pieces.

[0003] Currently, when testing the connection stability of the electrode tab and the connecting piece, the connecting piece is first fixed, and then the electrode tab is clamped by a tension mechanism, and a tension force is applied to the electrode tab away from the connecting piece. However, during the process of assembling the electrode tab and the connecting piece into the welding tensile testing equipment, the installation position deviation is more likely to occur, which makes it easy for the direction of pulling the electrode tab to tilt, resulting in low accuracy of the test results. Utility Model Content

[0004] This utility model provides a clamping device and a welding tensile strength testing device. The technical solution is as follows: According to one aspect of the present invention, a clamping device is provided for welding electrode tabs and connecting pieces, the clamping device comprising: an electrode tab clamp, a connecting piece clamp, and a mounting base mechanism; The electrode lug includes a connecting welding part and a clamping part, wherein the welding part is welded to the connecting piece; The electrode clamp is located on the side of the electrode opposite to the connecting piece. The electrode clamp is used to clamp the clamping part and can apply a pulling force to the clamping part. The direction of the pulling force is perpendicular to the extension direction of the connecting piece. The connecting piece clamp is slidably mounted on the mounting base mechanism. The connecting piece clamp is used to hold the connecting piece and can slide along the extension direction of the connecting piece.

[0005] Optionally, the extending direction of the clamping part intersects the extending direction of the connecting piece, and the clamping force applied by the tab clamp to the clamping part is parallel to the sliding direction of the connecting piece clamp.

[0006] Optionally, the connecting piece clamp has a sliding element on the side facing the mounting base mechanism; The mounting base mechanism includes a base and a strip-shaped sliding engagement component, wherein the sliding engagement component is fixedly connected to the base; The sliding member is slidably connected to the sliding mating member, allowing the sliding member to slide relative to the sliding mating member. The extending direction of the sliding mating member is parallel to the direction of the clamping force applied by the tab clamp to the clamping part.

[0007] Optionally, the slider has a strip-shaped sliding groove, and the sliding mating member includes a guide rail that engages within the sliding groove.

[0008] Optionally, the mounting base mechanism further includes two limiting blocks, which are detachably mounted at both ends of the sliding mating member.

[0009] Optionally, the connecting piece clamp further includes a base plate structure and a pressure strip structure; The base plate structure is located on the side of the sliding member away from the mounting base mechanism and is fixedly connected to the sliding member; The pressure strip structure is located on the side of the base plate structure opposite to the sliding member. The pressure strip structure is detachably connected to the base plate structure. The connecting piece is clamped between the base plate structure and the pressure strip structure, and the pressure strip structure does not overlap with the welding part.

[0010] Optionally, the pressure strip structure includes a first plate and a second plate; Both ends of the first plate are detachably connected to the base plate structure. The first end of the second plate is fixedly connected to the first plate, and the second end is detachably connected to the base plate structure. The extension direction of the first plate is perpendicular to the extension direction of the second plate.

[0011] Optionally, the connecting piece clamp further includes three bolt connection assemblies, which are located at both ends of the first plate and the second end of the second plate, and are detachably connected to the pressure strip structure and the base plate structure, respectively.

[0012] Optionally, the bolted connection assembly includes a connecting bolt, a first nut, and a second nut; The base plate structure has a clearance groove on the side facing the pressure strip structure that corresponds to the bolt connection assembly, and the bottom of the clearance groove has a first mounting through hole; The pressure strip structure has a second mounting through hole corresponding to the first mounting through hole; The connecting bolts are inserted into the first mounting through hole and the second mounting through hole. The first nut and the second nut are both sleeved on the connecting bolts, and the first nut and the second nut are respectively located on both sides of the pressure strip structure. The first nut is located in the clearance groove.

[0013] According to another aspect of the present invention, a welding tensile testing device is provided, the welding tensile testing device comprising: a test workbench, a tensile component and a clamping device, the clamping device comprising the clamping device described above; The clamping device is located on the test workbench, and the mounting base mechanism in the clamping device is fixed on the test workbench; The tension component is connected to the tab clamp in the clamping device.

[0014] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: A clamping device is provided, comprising an electrode tab clamp, a connecting piece clamp, and a mounting base mechanism. The electrode tab includes a welded portion and a clamping portion connected together. The welded portion is welded to the connecting piece. The electrode tab clamp is used to clamp the clamping portion of the electrode tab and can apply a tensile force to the clamping portion. The connecting piece clamp is slidably mounted on the mounting base mechanism and is used to clamp the connecting piece. During a tensile test between the electrode tab and the connecting piece, the electrode tab clamp applies a tensile force to the clamping portion, causing the electrode tab to tend to displace away from the connecting piece. As the tensile force increases, the weld surface between the electrode tab and the connecting piece is subjected to a vertical tensile stress, opposite to the direction of the adhesive force at the weld surface. When the tensile force reaches a critical value, the weld between the electrode tab and the connecting piece separates, and the tensile force value at this point reflects the weld strength. Since the tensile force direction is parallel to the extension direction of the weld surface, and the connecting piece clamp can slide and adjust its position parallel to the weld surface, it can ensure that the tensile force acts perpendicularly on the weld surface, reducing interference from shear forces or oblique forces. This allows for accurate evaluation of ultrasonic welding strength and improves the accuracy and reliability of the test results. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an electrode tab and a connecting piece provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of a clamping device provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the sliding member and base plate structure of a connecting piece clamp provided in an embodiment of this utility model; Figure 4 This is a structural schematic diagram of the base and sliding mating component of a mounting mechanism provided in an embodiment of this utility model; Figure 5This is a schematic diagram of the structure of a pressure plate provided in an embodiment of this utility model; Figure 6 yes Figure 1 A partial structural diagram of the clamping device shown in section A1.

[0017] Explanation of reference numerals in the attached figures: Electrode 11, welding part 111, clamping part 112; connecting piece 12; electrode clamp 21; connecting piece clamp 22, sliding part 221, sliding groove 2211, base plate structure 222, clearance groove c1, first mounting through hole k1, pressure strip structure 223, first plate 2231, second plate 2232, second mounting through hole k2, bolt connection assembly 224, connecting bolt 2242, first nut 2241, second nut 2243; mounting base mechanism 23, base 231, sliding mating part 232, guide rail 2321, limit stop 233, second threaded hole k3, fixing bolt 234. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0019] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0020] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0021] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0022] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1This is a schematic diagram of the structure of a tab 11 and a connecting piece 12 provided in an embodiment of this utility model. Figure 2 This is a schematic diagram of the structure of a clamping device provided in an embodiment of the present invention. Figure 2 The clamping device shown is equipped with a tab 11 and a connecting piece 12 to be inspected. This clamping device can be used to clamp the welded tab 11 and connecting piece 12. The welded tab 11 and connecting piece 12 can form the structure to be inspected, which can be cut from the battery structure during the production process. The clamping device can be used in a welding tensile testing device to inspect the welding quality of the clamped tab 11 and connecting piece 12 by applying tensile force to the tab 11. The tab 11 includes a welded portion 111 and a clamping portion 112. The welded portion 111 is welded to the connecting piece 12, and the extension direction of the welded portion 111 can be the same as the extension direction of the connecting piece 12.

[0023] The clamping device may include: tab clamp 21, connecting piece clamp 22 and mounting base mechanism 23.

[0024] The tab clamp 21 is located on the side of the tab 11 opposite to the connecting piece 12. The tab clamp 21 is used to clamp the clamping portion 112 of the tab 11 and can apply a tensile force to the clamping portion 112 of the tab 11. The direction of the tensile force is perpendicular to the extension direction of the connecting piece 12. The tab clamp 21 can apply a clamping force to both sides of the clamping portion 112 along the thickness direction to clamp the clamping portion 112, and after clamping the clamping portion 112, apply a tensile force away from the connecting piece 12 to the clamping portion 112. The extension direction of the connecting piece 12 is parallel to the welding surface between the welding portion 111 and the connecting piece 12. Thus, the direction of the tensile force applied by the tab clamp 21 to the clamping portion 112 can be perpendicular to the welding surface between the welding portion 111 and the connecting piece 12.

[0025] The connecting piece clamp 22 is slidably mounted on the mounting base mechanism 23. The connecting piece clamp 22 is used to clamp the connecting piece 12 and can slide along the extension direction of the connecting piece 12. That is, the sliding direction of the connecting piece clamp 22 can be perpendicular to the direction of the tension. The connecting piece 12 can be fixedly clamped on the mounting base mechanism 23. Since the connecting piece clamp 22 can slide on the mounting base mechanism 23, the connecting piece 12 fixed on the connecting piece clamp 22 can also slide accordingly.

[0026] During the tensile test of the tab 11 and the connecting piece 12, the tab clamp 21 applies a tensile force to the tab 11 by clamping the tab 11 with its clamping part 112, causing the tab 11 to tend to displace away from the connecting piece 12. As the tensile force gradually increases, the welding surface between the tab 11 and the connecting piece 12 is subjected to tensile stress perpendicular to the welding surface. This stress direction is opposite to the direction of the welding adhesion force, thus effectively overcoming the bonding force of the welding surface. When the tensile force reaches a critical value, the weld between the tab 11 and the connecting piece 12 will separate. The tensile force value recorded at this time can reflect the bonding strength of the welding surface between the tab 11 and the connecting piece 12. Since the direction of the tensile force is parallel to the extension direction of the welding surface, and the connecting piece clamp 22 and the connecting piece 12 mounted on the connecting piece clamp 22 can be adjusted in a direction parallel to the extension direction of the welding surface. When the electrode clamp 21 holds the clamping part 112 of the electrode 11 and applies a pulling force, the connecting piece clamp 22 and the connecting piece 12 can slide and adjust their positions under the action of the pulling force, so that the pulling force can act perpendicularly and directly on the welding surface, and opposite to the direction of the adhesion force of the welding surface. This can reduce the interference of shear force or oblique force, and can accurately evaluate the welding strength of the ultrasonic welding between the electrode 11 and the connecting piece 12, making the test results more reliable.

[0027] In summary, this utility model embodiment provides a clamping device including a tab clamp 21, a connecting piece clamp 22, and a mounting base mechanism 23. The tab 11 includes a welded portion 111 and a clamping portion 112 connected together. The welded portion 111 is welded to the connecting piece 12. The tab clamp 21 is used to clamp the clamping portion 112 of the tab 11 and can apply a tensile force to the clamping portion 112 of the tab 11. The connecting piece clamp 22 is slidably mounted on the mounting base mechanism 23 and is used to clamp the connecting piece 12. During the tensile test between the tab 11 and the connecting piece 12, the tab clamp 21 clamps the clamping portion 112 and applies a tensile force, causing the tab 11 to tend to displace away from the connecting piece 12. As the tensile force increases, the weld surface between the electrode tab 11 and the connecting piece 12 is subjected to vertical tensile stress, which is opposite to the direction of the adhesive force at the weld surface. When the tensile force reaches a critical value, the weld between the electrode tab 11 and the connecting piece 12 separates, and the tensile force value at this point can reflect the weld strength. Since the tensile force is parallel to the extension direction of the weld surface, and the connecting piece clamp 22 can be adjusted in parallel sliding position, it can be ensured that the tensile force acts perpendicularly on the weld surface, reducing shear force interference. This allows for accurate assessment of ultrasonic welding strength and improves the accuracy and reliability of the test results.

[0028] Please refer to Figure 1 and Figure 2In an optional embodiment, the extending direction of the clamping part 112 may intersect with the extending direction of the connecting piece 12. For example, the extending direction of the clamping part 112 may be perpendicular to the extending direction of the connecting piece 12. That is, the welding part 111 may be parallel to the connecting piece 12, and the included angle between the clamping part 112 and the welding part 111 is 90°.

[0029] The clamping force applied by the tab clamp 21 to the clamping part 112 is parallel to the sliding direction of the connecting piece clamp 22. That is, the tab clamp 21 can clamp both sides of the clamping part 112 along the thickness direction of the clamping part 112 of the tab 11, and the direction of the clamping force applied by the tab clamp 21 to the clamping part 112 is also the opening and closing direction of the tab clamp 21.

[0030] Please refer to Figure 1 , Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the sliding member 221 and the base plate structure 222 of a connecting piece clamp 22 provided in an embodiment of this utility model. Figure 4 This is a schematic diagram of the structure of the base 231 and sliding engagement member 232 of the mounting base mechanism 23 provided in an embodiment of the present invention. In an optional embodiment, the side of the connecting piece clamp 22 facing the mounting base mechanism 23 may have a sliding member 221. The mounting base mechanism 23 may include a base 231 and a strip-shaped sliding engagement member 232, which is fixedly connected to the base 231. The sliding engagement member 232 and the base 231 may be bonded or bolted together, or the sliding engagement member 232 may be an integral structure with the base 231.

[0031] The sliding member 221 is slidably connected to the sliding mating member 232, allowing the sliding member 221 to slide relative to the sliding mating member 232. The extending direction of the sliding mating member 232 is parallel to the direction of the clamping force applied by the tab clamp 21 to the clamping part 112. That is, the extending direction of the sliding mating member 232 is parallel to the opening and closing direction of the tab clamp 21.

[0032] In an optional embodiment, the slider 221 may have a strip-shaped sliding groove 2211, and the sliding mating member 232 includes a guide rail 2321, which is engaged within the sliding groove 2211. The guide rail 2321 can be fitted into the sliding groove 2211, and the guide rail 2321 can be slidably connected to the sliding groove 2211 and fixedly connected to the base 231. The length direction of both the guide rail 2321 and the length direction of the sliding groove 2211 can be parallel to the opening and closing direction of the tab clamp 21. This allows the slider 221 to reciprocate along the length direction of the guide rail 2321, thereby allowing the connecting piece 12 mounted on the connecting piece clamp 22 to slide under the pulling force of the tab clamp 21.

[0033] For example, the cross-sectional shape of the guide rail 2321 can be T-shaped, and the cross-section of the sliding groove 2211 is also T-shaped; the cross-sectional shapes of the base 231 and the guide rail 2321 can be I-shaped, wherein, in the extension direction perpendicular to the guide rail 2321, the width of the base 231 is greater than the width of the guide rail 2321.

[0034] Please refer to Figure 1 In an optional embodiment, the mounting base mechanism 23 may further include two limiting blocks 233, which are detachably mounted at both ends of the sliding mating member 232. The limiting blocks 233 may be hexahedral, such as cube or cuboid. The limiting blocks 233 can be used to prevent the connecting piece clamp 22 from falling off the sliding mating member 232.

[0035] The limiting block 233 has a first threaded hole, and the end of the sliding mating part 232 has a second threaded hole k3 corresponding to the first threaded hole. The mounting base mechanism 23 may also include two fixing bolts 234, which can be sequentially inserted into the first threaded hole and the second threaded hole k3 to install the limiting block 233 at both ends of the sliding mating part 232.

[0036] In one alternative implementation, please refer to Figure 1 , Figure 3 and Figure 5 , Figure 5 This is a schematic diagram of the structure of a pressure plate provided in an embodiment of the present invention. In an optional embodiment, the connecting piece clamp 22 may further include a base plate structure 222 and a pressure strip structure 223. The base plate structure 222 is located on the side of the sliding member 221 away from the mounting base mechanism 23 and is fixedly connected to the sliding member 221; the base plate structure 222 may be bolted or glued to the sliding member 221, or the base plate structure 222 may be an integral structure with the sliding member 221.

[0037] The pressure strip structure 223 is located on the side of the base plate structure 222 opposite to the sliding member 221. The pressure strip structure 223 is detachably connected to the base plate structure 222. The connecting piece 12 is clamped between the base plate structure 222 and the pressure strip structure 223, and the pressure strip structure 223 does not overlap with the welded part 111. The pressure strip structure 223 can be bolted to the base plate structure 222. When it is necessary to clamp the connecting piece 12 between the base plate structure 222 and the pressure strip structure 223, the base plate structure 222 and the pressure strip structure 223 can be separated first, the connecting piece 12 can be placed on the base plate structure 222, and then the pressure strip structure 223 can be placed on the base plate structure 222. The connecting piece used to connect the pressure strip structure 223 and the base plate structure 222 can be tightened to press the connecting piece 12 onto the base plate structure 222.

[0038] In one optional embodiment, the pressure strip structure 223 may include a first plate 2231 and a second plate 2232; both ends of the first plate 2231 are detachably connected to the base plate structure 222; the first end of the second plate 2232 is fixedly connected to the first plate 2231, and the second end is detachably connected to the base plate structure 222, and the extension direction of the first plate 2231 is perpendicular to the extension direction of the second plate 2232.

[0039] The pressure strip structure 223 can be T-shaped, and all three ends of the T-shaped pressure strip structure 223 are detachably connected to the base plate structure 222. The width of the first plate 2231 can be greater than the width of the second plate 2232.

[0040] Please refer to Figure 1 and Figure 6 , Figure 6 yes Figure 1 The schematic diagram of a partial structure A1 of the clamping device shown illustrates an optional embodiment where the connecting piece clamp 22 may further include three bolt connection assemblies 224. These three bolt connection assemblies 224 are located at both ends of the first plate 2231 and the second end of the second plate 2232, respectively, and are detachably connected to the pressure strip structure 223 and the base plate structure 222. Thus, when performing welding tensile testing on the tab 11 and the connecting piece 12, the main stress-bearing parts of the clamping device are the three bolt connection assemblies 224. After multiple uses, only the bolt connection assemblies 224 with greater wear need to be replaced, thereby improving the service life and reducing maintenance difficulty of the clamping device.

[0041] Please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 In one optional embodiment, each bolt connection assembly 224 may include a connecting bolt 2242, a first nut 2241, and a second nut 2243. The base plate structure 222 has a clearance groove c1 corresponding to the bolt connection assembly 224 on the side facing the pressure strip structure 223, and the bottom of each clearance groove c1 has a first mounting through hole k1. The pressure strip structure 223 may have a second mounting through hole k2 corresponding to the first mounting through hole k1. The connecting bolt 2242 passes through the first mounting through hole k1 and the second mounting through hole k2. The first nut 2241 and the second nut 2243 are both sleeved on the connecting bolt 2242, and the first nut 2241 and the second nut 2243 are respectively located on both sides of the pressure strip structure 223. The first nut 2241 is located in the clearance groove c1. The height of the first nut 2241 may be the same as the depth of the clearance groove c1.

[0042] For example, the base plate structure 222 has three clearance grooves c1. The clearance groove c1 located at the end of the second plate 2232 away from the first plate 2231 can be located at the center of the base plate structure 222 in the length direction. The two clearance grooves c1 located at the two ends of the first plate 2231 can be symmetrical. The first mounting through hole k1 in the two clearance grooves c1 is located on the side close to the geometric center of the base plate structure 222, so as to facilitate the operator to install the first nut 2241.

[0043] When the operator needs to replace the test tab 11 and connecting piece 12, they only need to remove the second nut 2243 from the connecting bolt 2242 and then remove the pressure strip structure 223 from the three connecting bolts 2242 to replace the tab 11 and connecting piece 12. This reduces the difficulty of operation.

[0044] This utility model embodiment also provides a welding tensile testing device, which may include: a test workbench, a tensile component, and a clamping device, wherein the clamping device includes the clamping device in any of the above embodiments.

[0045] The clamping device is located on the test workbench, and the mounting base mechanism in the clamping device is fixed on the test workbench; the tension component is connected to the tab clamp in the clamping device, and the tension component is used to provide power to the tab clamp.

[0046] For example, the installation and testing process of the welding tensile testing equipment in this embodiment of the present invention may include the following steps: Step 201: Fix the mounting base mechanism with guide rails on the test workbench. The center of the guide rails and the center of the electrode clamps are aligned in the vertical direction, and the length direction of the guide rails is aligned with the tightening direction of the clamps.

[0047] Step 202: Assemble the slider and base plate structure with T-shaped sliding groove on the guide rail, and slide it to the center position or near the center position of the guide rail.

[0048] Step 203: Fix the two limit blocks to both ends of the guide rail by bolting them together to ensure that the base plate structure can only move between the two limit blocks.

[0049] Step 204: Insert the three connecting bolts from the bottom up into the three first mounting through holes of the base plate structure, and screw the first nut on the other end of each bolt. The first nut is located in the corresponding first clearance groove.

[0050] Step 205: Cut off the connecting piece and the tab on the battery sample with the connecting piece welded along the base of the tab, and straighten the shape of the clamping part and the welding part of the tab so that the included angle between the clamping part and the welding part is 90°, and then place the welded tab and connecting piece on the base plate structure.

[0051] Step 206: The three second mounting through holes of the pressure strip structure pass through the three fixed connecting bolts respectively, so that the pressure strip structure can press down the welded electrode lugs and connecting pieces. On top of the pressure strip structure, flat washers, spring washers and second nuts are placed in sequence. The flat washers, spring washers and second nuts are all fitted on the connecting bolts. Then tighten the second nut to press the connecting pieces together.

[0052] Step 207: Adjust the position of the tab clamp and make the tab clamp securely clamp the tab mounting part, then start the tensile test and record the test results.

[0053] Step 208: Separate the tab clamp from the tab and return the tab clamp to its original position.

[0054] Step 209: Loosen the second nut tightened in step 206 and remove the connecting piece.

[0055] Step 210: When retesting, repeat steps 205 to 209 above.

[0056] It should be noted that the dimensions of the areas may have been exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element is referred to as "on top of" another element, it can be directly on the other element, or there may be intermediate elements. Additionally, it is understood that when an element is referred to as "below" another element, it can be directly below the other element, or there may be more than one intermediate element. Furthermore, it is also understood that when an element is referred to as "between" two elements, it can be the only layer between the two elements, or there may be more than one intermediate element. Similar reference numerals throughout indicate similar elements.

[0057] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0058] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A clamping device, characterized in that, The clamping device is used to hold the electrode tabs and connecting pieces for welding, and includes: an electrode tab clamp, a connecting piece clamp, and a mounting base mechanism; The electrode lug includes a connecting welding part and a clamping part, wherein the welding part is welded to the connecting piece; The electrode clamp is located on the side of the electrode opposite to the connecting piece. The electrode clamp is used to clamp the clamping part and can apply a pulling force to the clamping part. The direction of the pulling force is perpendicular to the extension direction of the connecting piece. The connecting piece clamp is slidably mounted on the mounting base mechanism. The connecting piece clamp is used to hold the connecting piece and can slide along the extension direction of the connecting piece.

2. The clamping device according to claim 1, characterized in that, The extending direction of the clamping part intersects the extending direction of the connecting piece, and the clamping force applied by the tab clamp to the clamping part is parallel to the sliding direction of the connecting piece clamp.

3. The clamping device according to claim 1, characterized in that, The connecting piece clamp has a sliding element on the side facing the mounting base mechanism; The mounting base mechanism includes a base and a strip-shaped sliding engagement component, wherein the sliding engagement component is fixedly connected to the base; The sliding member is slidably connected to the sliding mating member, allowing the sliding member to slide relative to the sliding mating member. The extending direction of the sliding mating member is parallel to the direction of the clamping force applied by the tab clamp to the clamping part.

4. The clamping device according to claim 3, characterized in that, The sliding member has a strip-shaped sliding groove, and the sliding mating member includes a guide rail, which is engaged within the sliding groove.

5. The clamping device according to claim 3, characterized in that, The mounting base mechanism also includes two limiting blocks, which are detachably mounted at both ends of the sliding mating member.

6. The clamping device according to claim 3, characterized in that, The connecting piece clamp also includes a base plate structure and a pressure strip structure; The base plate structure is located on the side of the sliding member away from the mounting base mechanism and is fixedly connected to the sliding member; The pressure strip structure is located on the side of the base plate structure opposite to the sliding member. The pressure strip structure is detachably connected to the base plate structure. The connecting piece is clamped between the base plate structure and the pressure strip structure, and the pressure strip structure does not overlap with the welding part.

7. The clamping device according to claim 6, characterized in that, The pressure strip structure includes a first plate and a second plate; Both ends of the first plate are detachably connected to the base plate structure. The first end of the second plate is fixedly connected to the first plate, and the second end is detachably connected to the base plate structure. The extension direction of the first plate is perpendicular to the extension direction of the second plate.

8. The clamping device according to claim 7, characterized in that, The connecting piece clamp also includes three bolt connection assemblies, which are located at both ends of the first plate and the second end of the second plate, and are detachably connected to the pressure strip structure and the base plate structure, respectively.

9. The clamping device according to claim 8, characterized in that, The bolted connection assembly includes a connecting bolt, a first nut, and a second nut; The base plate structure has a clearance groove on the side facing the pressure strip structure that corresponds to the bolt connection assembly, and the bottom of the clearance groove has a first mounting through hole; The pressure strip structure has a second mounting through hole corresponding to the first mounting through hole; The connecting bolts are inserted into the first mounting through hole and the second mounting through hole. The first nut and the second nut are both sleeved on the connecting bolts, and the first nut and the second nut are respectively located on both sides of the pressure strip structure. The first nut is located in the clearance groove.

10. A welding tensile testing device, characterized in that, It includes a test workbench, a tensile component, and a clamping device, wherein the clamping device includes the clamping device according to any one of claims 1 to 9; The clamping device is located on the test workbench, and the mounting base mechanism in the clamping device is fixed on the test workbench; The tension component is connected to the tab clamp in the clamping device.

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