Pole group positioning mechanism and welding device

Abstract

The utility model relates to the technical field of battery cell manufacturing, and provides a pole group positioning mechanism and a welding device. The pole group positioning mechanism comprises a workbench for placing a pole group, and a positive pole positioning part and a negative pole positioning part which are respectively arranged on two sides of the workbench, the positive pole positioning part is provided with a positive pole positioning unit for positioning the positive pole lug side of the pole group; the negative electrode positioning part comprises a negative electrode driving unit and a negative electrode positioning unit which is driven by the negative electrode driving unit and moves towards one side of the positive electrode positioning part, the negative electrode positioning unit is located on the negative electrode lug side of the electrode group, and the negative electrode positioning unit is used for clamping the two sides of the electrode group in the thickness direction and is matched with the positive electrode positioning unit to position the electrode group. According to the pole group positioning mechanism disclosed by the utility model, the negative pole of the pole group is free from pressure loss, the pole lug is free from deformation, and the process requirements that the weak end is not damaged by pressure and the shape of the pole lug is kept flat in the pole group positioning process can be met, so that the yield of finished battery cells can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery cell manufacturing, particularly relates to a pole group positioning mechanism. BACKGROUND

[0002] At present, lithium ion batteries are increasingly widely used in the automobile and energy storage industries. The shell of a lithium ion battery is usually made of steel or aluminum. With the increasing demand for energy density and the continuous improvement of production processes, aluminum shell batteries are gradually becoming the mainstream trend.

[0003] In the production process of aluminum shell batteries, the positioning accuracy of the battery cell pole group plays a key role, as it directly affects the smoothness of the production process and the final quality of the product. Traditionally, pole group positioning uses a method of positioning with air cylinders on both sides. However, this method has many drawbacks. On the one hand, during multiple positioning processes, the negative pole plate is easily squeezed and the material falls off. On the other hand, because the copper foil is soft, the positioning operation can cause the tabs to scatter, and in severe cases, the tabs can be folded, resulting in product scrap. These problems are further highlighted in the subsequent welding process, which can result in unsatisfactory welding between the tabs, deviation in the welding connection position of the tabs and connecting pieces, and ultimately adversely affecting the quality and quality of the finished product. SUMMARY

[0004] Therefore, the utility model aims to provide a pole group positioning mechanism that can improve the yield of battery cell finished products.

[0005] To achieve the above-mentioned purposes, the technical solution of the utility model is as follows:

[0006] A pole group positioning mechanism includes a workbench for placing a pole group, and a positive electrode positioning unit and a negative electrode positioning unit respectively arranged on both sides of the workbench.

[0007] The positive electrode positioning unit is used to position the positive tab side of the pole group.

[0008] The negative electrode positioning unit includes a negative electrode driving unit and a negative electrode positioning unit driven by the negative electrode driving unit and moving towards the positive electrode positioning unit side. The negative electrode positioning unit is located on the negative tab side of the pole group, and is used to clamp both sides of the pole group in the thickness direction and cooperate with the positive electrode positioning unit to position the pole group.

[0009] Further, the negative electrode positioning unit comprises a first mounting base connected with a driving end of the negative electrode driving unit, a second mounting base provided on the first mounting base and moving along the moving direction of the negative electrode positioning unit, and an elastic member provided between the first mounting base and the second mounting base, and the negative electrode positioning unit is provided on the second mounting base.

[0010] Further, a guide assembly is provided between the second mounting base and the workbench, and the guide assembly is used for guiding the second mounting base to move along the moving direction of the negative electrode positioning unit.

[0011] Further, the guide assembly comprises a guide rod provided on the second mounting base and arranged along the moving direction of the negative electrode positioning unit, and a guide groove corresponding to the guide rod and provided on the workbench, and the guide rod is slidingly provided in the guide groove.

[0012] Further, the alarm assembly is further provided for preventing the relative sliding between the negative electrode positioning unit and the pole group.

[0013] Further, the alarm assembly comprises a trigger rod provided on the second mounting base, a contact switch provided on the workbench, and a controller connected with the contact switch, and the trigger rod and the contact switch are oppositely arranged along the moving direction of the negative electrode positioning unit; or, the alarm assembly comprises an abutting rod provided on the second mounting base, a pressure detection unit corresponding to the abutting rod along the moving direction of the negative electrode positioning unit and provided on the workbench, and a controller connected with the pressure detection unit.

[0014] Further, a connecting guide rod is provided on the first mounting base, the second mounting base is slidingly provided on the first mounting base through the connecting guide rod, and the elastic member comprises a spring sleeved on the connecting guide rod; and / or, the negative electrode driving unit comprises a negative electrode cylinder, and the first mounting base is connected with a cylinder rod of the negative electrode cylinder.

[0015] Further, the negative electrode positioning unit adopts a rotary clamping cylinder.

[0016] Further, the rotary clamping cylinder has two clamping members oppositely arranged along the thickness direction of the pole group, and a buffer pad is arranged on the clamping side of each clamping member, and a buffer pad is arranged on the clamping jaw of the rotary clamping cylinder, and the buffer pad is located on the side of the clamping jaw facing the pole group.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The pole group positioning mechanism, by the negative pole positioning unit clamping two sides of the thickness direction of the pole group, and cooperating with the positive pole positioning unit to position the pole group under the driving of the negative pole driving unit, compared with the traditional technology, can avoid the negative pole sheet in the pole group being pressed off material, and the pole lug being dispersed or even being folded, so that the negative pole of the pole group is not pressed, the pole lug is not deformed, and then the process requirements that the weak end is not pressed and damaged in the pole group positioning process and the appearance of the pole lug is maintained flat are met, so that the yield of the battery cell finished product can be improved.

[0019] In addition, by matching the first mounting seat, the second mounting seat and the elastic member, the arrangement and installation of the negative pole positioning unit are facilitated, and the elastic buffering positioning of the pole group is also facilitated, so that the pole group is not damaged due to excessive pressure. The guide assembly is arranged, so that the movement direction of the second mounting seat is guided, and then the movement stability of the negative pole positioning unit is improved. The guide assembly includes a guide rod and a guide groove, and has a simple structure and can realize cost reduction design. The alarm assembly is arranged, so that the pole group positioning mechanism has an error-proof function, the sliding phenomenon between the negative pole positioning unit and the pole group due to insufficient clamping force of the negative pole positioning unit is avoided, and the problem of poor positioning of the pole group is caused. The alarm assembly adopts the matching form of the trigger rod and the contact switch, or the alarm assembly adopts the matching form of the abutting rod and the pressure detection unit, so that the alarm function can be realized, and the structure is simple and the reliability is high.

[0020] In addition, the matching of the connecting guide rod and the spring facilitates the elastic buffering between the second mounting seat and the first mounting seat, and then the elastic buffering positioning of the pole group is realized, so that the pole group is not damaged due to excessive pressure. The negative pole driving unit adopts a negative pole cylinder, has high driving speed, stable power output, high safety, and is mature in product and low in maintenance cost. The negative pole positioning unit adopts a rotary clamping cylinder, can clamp two sides of the thickness direction of the pole group in a rotary pressing manner, is uniformly stressed, is not easy to cause damage to the pole group, has small occupied space and high stability. The buffer pad is arranged on the clamping side of the clamping piece, so that the pole group is not damaged and the finished product yield is ensured.

[0021] Another purpose of the utility model is to provide a welding device, the welding device is equipped with the pole group positioning mechanism.

[0022] The welding device is equipped with the pole group positioning mechanism, and has the same beneficial effects as the traditional technology, and details are not repeated here. ACCURACY OF DRAWINGS

[0023] The drawings that constitute a part of the utility model are used to provide further understanding of the utility model, and the illustrative embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0024] Figure 1The overall structure block diagram of the pole group positioning mechanism is shown in the embodiment of the utility model.

[0025] Figure 2 The structure schematic diagram of the pole group is shown in the embodiment of the utility model.

[0026] Figure 3 The structure schematic diagram of the negative electrode positioning part is shown in the embodiment of the utility model.

[0027] Figure 4 For Figure 3 The enlarged view of A in the middle;

[0028] Figure 5 The structure block diagram when the contact switch is connected with the controller is shown in the embodiment of the utility model.

[0029] Figure 6 The structure schematic diagram of the positive electrode positioning part is shown in the embodiment of the utility model.

[0030] Mark explanation:

[0031] 1, workbench; 11, guide groove; 12, avoid empty slot;

[0032] 2, positive electrode positioning part; 21, base; 22, positive electrode cylinder; 23, positive electrode positioning block; 231, avoid slot; 24, guide rod; 241, limit block;

[0033] 3, negative electrode positioning part; 31, negative electrode positioning unit; 311, clamping piece; 312, buffer pad; 32, negative electrode cylinder; 33, first mounting seat; 331, sliding groove; 332, connecting guide rod; 3321, sliding block; 3322, connecting rod; 3323, fixed block; 34, second mounting seat; 341, guide rod; 35, elastic piece;

[0034] 4, pole group; 41, negative electrode lug side; 42, positive electrode lug side;

[0035] 5, trigger rod; 6, contact switch; 7, controller. Specific implementation

[0036] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0037] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons of ordinary skill in the art will readily recognize that embodiments of the application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and processes have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0038] In the description of the utility model, it is explained that, if the terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship appear, it is based on the orientation or positional relationship shown in the drawing, and it is only for the convenience of describing the utility model and simplifying the description, and therefore it cannot be understood as the restriction of the utility model to the indicated device or element must have a specific orientation, a specific orientation and operation, and therefore it cannot be understood as the restriction of the utility model. In addition, if the terms such as "first", "second" and the like appear, they are only used for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connecting", "connecting", "connecting member" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with the specific situation.

[0040] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0041] Embodiment one

[0042] The embodiment relates to a polar group positioning mechanism, which is beneficial to solve the problem that the traditional polar group positioning device is easy to damage the polar group 4 and affect the yield.

[0043] As shown in the whole structure, Figures 1 to 6 The polar group positioning mechanism of the embodiment includes a workbench 1 for placing the polar group 4, and a positive electrode positioning part 2 and a negative electrode positioning part 3 respectively arranged on both sides of the workbench 1.

[0044] In addition, the positive electrode positioning part 2 has a positive electrode positioning unit for positioning the positive electrode ear side 42 of the polar group 4. The negative electrode positioning part 3 includes a negative electrode driving unit, and a negative electrode positioning unit 31 driven by the negative electrode driving unit and moving to the side of the positive electrode positioning part 2, the negative electrode positioning unit 31 is located at the negative electrode ear side 41 of the polar group 4, and the negative electrode positioning unit 31 is used for clamping both sides of the thickness direction of the polar group 4 and cooperating with the positive electrode positioning unit to position the polar group 4.

[0045] At this time, as set above, the thickness direction of the pole group 4 is clamped by the negative positioning unit 31, and the pole group 4 is positioned under the drive of the negative driving unit and in cooperation with the positive positioning unit, compared with the prior art, the negative pole piece in the pole group 4 can be avoided to be pressed off material, and the pole lug is dispersed or even folded, so that the negative pole of the pole group 4 is not pressed, the pole lug is not deformed, and then the process requirements that the weak end of the pole group 4 positioning process is not pressed and the pole lug appearance is maintained flat are met, so that the product yield of the battery cell can be improved.

[0046] Based on the above content, in detail, in the embodiment, in the specific implementation, the workbench 1 is preferably provided with an empty slot 12, which can be used to avoid the clamping end of the feeding and discharging mechanism, so as to clamp the pole group 4 by the feeding and discharging mechanism. And, if necessary, the pole group positioning mechanism of the embodiment further comprises a rack for arranging and installing the positive positioning part 2 and the negative positioning part 3, and the structure shape of the rack can be set and adjusted according to the actual arrangement requirement of the positive positioning part 2 and the negative positioning part 3.

[0047] It should be noted that the positive positioning part 2 and the negative positioning part 3 of the embodiment are oppositely arranged to position the positive lug side 42 and the negative lug side 41 of the pole group 4 respectively. Figure 2 The contour size of the negative lug and the positive lug of the pole group 4 is not the same, which is mainly to reflect the difference between the two, and does not represent the specific contour size design.

[0048] Meanwhile, the direction-related expressions in the embodiment are only used as exemplary description of the embodiment. In specific implementation, the direction expressions in the embodiment are different with the arrangement direction of the positive positioning part 2 and the negative positioning part 3, that is, the directions in the embodiment refer to the relative coordinate system with the arrangement direction of the positive positioning part 2 and the negative positioning part 3 as the reference.

[0049] In the embodiment, as a preferred implementation form, referring to Figure 3 As shown in the figure, the negative positioning part 3 comprises a first mounting seat 33 connected with the driving end of the negative driving unit, a second mounting seat 34 moving along the moving direction of the negative positioning unit 31 and arranged on the first mounting seat 33, and an elastic member 35 arranged between the first mounting seat 33 and the second mounting seat 34, and the negative positioning unit 31 is arranged on the second mounting seat 34.

[0050] Here, by cooperating the first mounting seat 33, the second mounting seat 34 and the elastic member 35, not only the arrangement and installation of the negative positioning unit 31 are facilitated, but also the elastic buffering positioning of the pole group 4 is realized, so as to avoid the damage of the pole group 4 due to excessive pressure.

[0051] In particular embodiments, as a preferred implementation form, the second mounting seat 34 and the workbench 1 are provided with a guide assembly for guiding the movement of the second mounting seat 34 along the movement direction of the negative electrode positioning unit 31. Thus, the movement direction of the second mounting seat 34 can be guided, thereby improving the movement stability of the negative electrode positioning unit 31.

[0052] Furthermore, as a preferred implementation form, the guide assembly in the present embodiment includes a guide rod 341 arranged on the second mounting seat 34 along the movement direction of the negative electrode positioning unit 31, and a guide groove 11 arranged on the workbench 1 corresponding to the guide rod 341, and the guide rod 341 is slidingly arranged in the guide groove 11. The guide assembly includes the guide rod 341 and the guide groove 11, which not only facilitates the guided movement of the second mounting seat 34 and improves the stability of the guided movement, but also has a simple structure and facilitates cost reduction design.

[0053] Of course, the number of guide assemblies in the present embodiment can be set and adjusted according to the actual guiding requirements of the second mounting seat 34, for example, two or three guide assemblies are arranged at intervals, as long as the second mounting seat 34 can be guided and moved along the movement direction of the negative electrode positioning unit 31.

[0054] In addition, as a preferred implementation form, the electrode group positioning mechanism of the present embodiment further includes an alarm assembly for preventing relative sliding between the negative electrode positioning unit 31 and the electrode group 4. In this way, the electrode group positioning mechanism can have an error prevention function, avoiding the problem of poor positioning of the electrode group 4 due to insufficient clamping force of the negative electrode positioning unit 31 and sliding between the negative electrode positioning unit 31 and the electrode group 4.

[0055] To be specific, as a preferred implementation form, the alarm assembly in the present embodiment still refers to Figure 3 and Figure 5 The alarm assembly includes a trigger rod 5 arranged on the second mounting seat 34, a contact switch 6 arranged on the workbench 1, and a controller 7 connected to the contact switch 6. The trigger rod 5 and the contact switch 6 are arranged opposite to each other along the movement direction of the negative electrode positioning unit 31. In this way, when the negative electrode positioning unit 31 and the electrode group 4 slide, the trigger rod 5 will push the contact switch 6, so that the contact switch 6 is triggered. At this time, the controller 7 can issue an alarm based on the trigger signal of the contact switch 6, thereby realizing the alarm function, and the structure is simple and the reliability is high.

[0056] Of course, the above contact switch 6 and controller 7 can adopt the related products known to those skilled in the art, for example, the controller 7 can adopt PLC, computer and the like. At the same time, in order to realize the alarm function, in addition to the design form of the trigger rod 5 and the contact switch 6 in the embodiment, other structure design forms can also be used, for example, as a preferred embodiment, the alarm assembly includes an abutting rod arranged on the second mounting seat 34, a pressure detection unit arranged on the workbench 1 and corresponding to the abutting rod along the moving direction of the negative electrode positioning unit 31, and a controller 7 connected with the pressure detection unit, etc., which can also realize the alarm function, and has simple structure and high reliability.

[0057] Furthermore, in the embodiment, as a preferred embodiment, in combination with the above-mentioned Figure 3 and Figure 4 It is shown that the first mounting seat 33 is provided with a connecting guide rod 332, the second mounting seat 34 is guided and slid on the first mounting seat 33 through the connecting guide rod 332, and the elastic member 35 includes a spring sleeved on the connecting guide rod 332, and the two ends of the spring abut against the first mounting seat 33 and the second mounting seat 34, respectively. Through the cooperation of the connecting guide rod 332 and the spring, the elastic buffer between the second mounting seat 34 and the first mounting seat 33 is formed, and the elastic buffer positioning of the pole group 4 is realized, so as to avoid damage of the pole group 4 due to excessive pressure.

[0058] In specific implementation, the first mounting seat 33 of the embodiment is provided with a sliding groove 331 arranged along the moving direction of the negative electrode positioning unit 31, the connecting guide rod 332 includes a sliding block 3321 slidably arranged in the sliding groove 331, a fixed block 3323 fixedly connected with the second mounting seat 34, and a connecting rod 3322 connecting the sliding block 3321 and the fixed block 3323, so as to realize the guided sliding of the second mounting seat 34 on the first mounting seat 33.

[0059] In the embodiment, as a preferred embodiment, the negative electrode driving unit includes a negative electrode air cylinder 32, and the first mounting seat 33 is connected with the cylinder rod of the negative electrode air cylinder 32. It can be understood that the negative electrode driving unit adopts the negative electrode air cylinder 32, which has fast driving speed, stable power output, high safety, mature product and low maintenance cost.

[0060] In addition, in the embodiment, as a preferred embodiment, the negative electrode positioning unit 31 adopts a rotary clamping air cylinder. In this way, the two sides in the thickness direction of the pole group 4 can be clamped by rotary pressing, the stress is uniform, the pole group 4 is not easy to be damaged, and the occupied space is small and the stability is high.

[0061] In the embodiment, as a preferred implementation form, the rotary clamping cylinder has two clamping members 311 arranged opposite along the thickness direction of the pole group 4, and each clamping member 311 is provided with a buffer pad 312 on the clamping side, so as to avoid damage to the pole group 4 and ensure the yield of the finished product.

[0062] It is worth mentioning that the rotary clamping cylinder (negative electrode positioning unit 31) in the embodiment is preferably provided as two separate ones arranged on both sides of the width direction of the pole group 4, so as to simultaneously clamp both sides of the width direction of the pole group 4, so as to ensure better clamping effect, reduce the probability of slipping between the pole group 4 and the pole group 4, and improve the positioning effect.

[0063] In addition, the related structure parts not mentioned in the rotary clamping cylinder of the embodiment can refer to the structures in the double-pressing-plate rotary clamping cylinder or the double-pressing-plate rotary clamping cylinder known to those skilled in the art, for example, it includes a driving mechanism mainly composed of a cylinder, a transmission component connected between the two clamping members 311 and the driving mechanism, and the driving mechanism drives the two clamping members 311 to rotate and approach each other to clamp the pole group 4, and the like, which will not be described here.

[0064] In addition, referring to FIG. 1, Figure 6 As a preferred implementation form, the positive electrode positioning part 2 of the embodiment includes a base 21, and a positive electrode driving unit arranged on the base 21 and connected with the positive electrode positioning unit driving, and the positive electrode driving unit is used to drive the positive electrode positioning unit to move to the side of the negative electrode positioning part 3.

[0065] As a preferred implementation form, the positive electrode driving unit of the embodiment includes a positive electrode cylinder 22 arranged on the base 21, and the positive electrode positioning unit includes a positive electrode positioning block 23 arranged on the cylinder rod of the positive electrode cylinder 22, and the side of the positive electrode positioning block 23 facing the pole group 4 is provided with an avoiding groove 231 for avoiding the positive electrode ear of the pole group 4, so as to avoid damaging the positive electrode ear.

[0066] Further, as a preferred implementation form in the embodiment, the base 21 is provided with a guide rod 24 capable of reciprocating sliding along the moving direction of the positive electrode positioning block 23, and the positive electrode positioning block 23 is connected with one end of the guide rod 24. Here, the arrangement of the guide rod 24 is beneficial to improve the moving stability of the positive electrode positioning block 23.

[0067] Continuing to refer to FIG. 1, Figure 6 As a preferred implementation form in the embodiment, one end of the guide rod 24 away from the positive electrode positioning block 23 is provided with a limiting block 241, and the limiting block 241 is located on the side of the base 21 away from the positive electrode positioning block 23, thereby being capable of adding mechanical positioning to the positive electrode positioning block 23, and being beneficial to eliminate the error caused by the pushing distance of the positive electrode positioning block 23 due to the fluctuation of the positive electrode cylinder 22 itself, so as to improve the accuracy of the positive electrode reference positioning of the positive electrode ear.

[0068] Meanwhile, as a preferred implementation form, the guide rods 24 of the embodiment are arranged in two, and the positive electrode positioning block 23 is connected with the two guide rods 24. Here, the guide rods 24 are arranged in two, which is beneficial to further improve the movement stability of the positive electrode positioning block 23, and also beneficial to eliminate the above-mentioned error caused by the fluctuation of the positive electrode cylinder 22 itself.

[0069] Moreover, when the guide rods 24 are two, the two guide rods 24 can be arranged on both sides of the positive electrode positioning block 23 along the width direction of the electrode group 4, so that the arrangement is more reasonable. The positive electrode cylinder 22 and the negative electrode cylinder 32 of the embodiment can all use common cylinder products.

[0070] The electrode group positioning mechanism of the embodiment uses the positive electrode positioning part 2 as the positioning reference, and uses the scheme that the negative electrode positioning part 3 is positioned in cooperation with the positive electrode positioning part 2, and uses the way of large surface (two side surfaces in the thickness direction of the electrode group 4) compression positioning, which can be beneficial to avoid the deformation and machine damage of the electrode group 4 in the positioning process, realizes the optimization of the positioning mode on the basis of ensuring the accurate positioning of the electrode group 4, meets the needs that the weak end of the electrode group 4 is not damaged by compression and the appearance of the tab is maintained flat, thereby being beneficial to reduce the generation of tab folding and machine damage of the electrode group 4 in the production process of the battery cell, and effectively improves the product yield.

[0071] Embodiment two

[0072] The embodiment relates to a welding device, and the welding device is provided with the electrode group positioning mechanism in the embodiment one.

[0073] The welding device of the embodiment can improve the positioning accuracy of the electrode group, ensure the assembly accuracy between parts in the subsequent manufacturing process of the battery cell, and thereby be beneficial to improve the product yield.

[0074] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A pole group positioning mechanism, characterized in that: comprising a workbench for placing a pole group, and a positive electrode positioning part and a negative electrode positioning part respectively arranged on both sides of the workbench; the positive electrode positioning part has a positive electrode positioning unit for positioning a positive electrode lug side of the pole group; the negative electrode positioning part comprises a negative electrode driving unit, and a negative electrode positioning unit driven by the negative electrode driving unit and moving to the side of the positive electrode positioning part, the negative electrode positioning unit is located at a negative electrode lug side of the pole group, and the negative electrode positioning unit is used for clamping both sides of the pole group in the thickness direction and cooperating with the positive electrode positioning unit to position the pole group.

2. The pole group positioning mechanism according to claim 1, characterized in that: the negative electrode positioning part comprises a first mounting seat connected with a driving end of the negative electrode driving unit, a second mounting seat moving along the moving direction of the negative electrode positioning unit and arranged on the first mounting seat, and an elastic member arranged between the first mounting seat and the second mounting seat, and the negative electrode positioning unit is arranged on the second mounting seat.

3. The pole group positioning mechanism according to claim 2, characterized in that: a guide assembly is arranged between the second mounting seat and the workbench, and the guide assembly is used for guiding the second mounting seat to move along the moving direction of the negative electrode positioning unit.

4. The pole group positioning mechanism according to claim 3, characterized in that: the guide assembly comprises a guide rod arranged along the moving direction of the negative electrode positioning unit and arranged on the second mounting seat, and a guide groove corresponding to the guide rod and arranged on the workbench, and the guide rod is slidingly arranged in the guide groove.

5. The pole group positioning mechanism according to claim 2, characterized in that: further comprising an alarm assembly for preventing relative sliding between the negative electrode positioning unit and the pole group.

6. The pole group positioning mechanism according to claim 5, characterized in that: the alarm assembly comprises a trigger rod arranged on the second mounting seat, a contact switch arranged on the workbench, and a controller connected with the contact switch, and the trigger rod and the contact switch are arranged opposite to each other along the moving direction of the negative electrode positioning unit; or the alarm assembly comprises an abutting rod arranged on the second mounting seat, a pressure detection unit corresponding to the abutting rod along the moving direction of the negative electrode positioning unit and arranged on the workbench, and a controller connected with the pressure detection unit.

7. The pole group positioning mechanism according to claim 2, characterized in that: a connecting guide rod is arranged on the first mounting seat, the second mounting seat is slidingly arranged on the first mounting seat through the connecting guide rod, and the elastic member comprises a spring sleeved on the connecting guide rod; and / or the negative electrode driving unit comprises a negative electrode cylinder, and the first mounting seat is connected with a cylinder rod of the negative electrode cylinder.

8. The pole group positioning mechanism according to any one of claims 1 to 7, characterized in that: the negative electrode positioning unit adopts a rotary clamping cylinder.

9. The pole group positioning mechanism according to claim 8, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The rotary clamping cylinder has two clamping members oppositely arranged along the thickness direction of the pole group, and the clamping side of each clamping member is provided with a buffer pad.

10. A welding device, characterized in that: The welding device is provided with the pole group positioning mechanism according to any one of claims 1 to 9.

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