Tab welding device

Abstract

The utility model provides a kind of tab welding device, it includes: welding seat, first positioning structure is equipped on welding seat, first positioning structure can be contacted with battery cell to position battery cell, multiple second positioning structures are equipped on welding seat, multiple second positioning structures are sequentially spaced along first direction, each second positioning structure can be contacted with corresponding tab and metal connecting piece, to position tab and metal connecting piece;Welding structure, welding structure has welding component for welding, welding seat is movably arranged along first direction relative to welding structure, to make welding component switch at multiple second positioning structures, when welding component and any one second positioning structure position correspond, welding component can weld and connect tab and metal connecting piece at second positioning structure.The tab welding device of the utility model embodiment solves the technical problem that the quality of battery produced is poor due to insufficient positioning accuracy in the tab welding process in the related art.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing, and more specifically, to a tab welding device. Background Technology

[0002] In the battery manufacturing process, the tab technology is a key factor affecting battery performance and reliability. The tab, as a core component connecting the battery's internal electrodes to the external circuitry, directly impacts the battery's internal resistance, cycle life, and safety performance.

[0003] In related technologies, metal connectors can be used to lead out the positive and negative tabs of the battery cell. During this process, tab welding is required. However, the positioning accuracy of each component is poor when leading out the tabs, making it difficult to guarantee welding precision. This can easily lead to problems such as misalignment of the tabs and metal connectors after welding, uneven overlap, or even incomplete welding or breakage, affecting the quality of the produced batteries.

[0004] It is evident that the electrode welding device in the relevant technology suffers from a technical problem: insufficient positioning accuracy during the welding process leads to poor battery quality. Currently, no effective solution has been proposed to address this issue.

[0005] The information disclosed in the background section is only intended to enhance the understanding of the background art described herein. Therefore, the background art may contain information that would not be considered part of the prior art by those skilled in the art. Utility Model Content

[0006] The main purpose of this utility model is to provide a tab welding device to solve the technical problem that the poor quality of batteries produced by tab welding devices in related technologies is caused by insufficient positioning accuracy during the welding process.

[0007] To achieve the above objectives, embodiments of this utility model provide a tab welding device, comprising: a welding base, on which a first positioning structure is provided, the first positioning structure being able to contact the battery cell to position the battery cell; the welding base being provided with a plurality of second positioning structures, the plurality of second positioning structures being arranged sequentially at intervals along a first direction; each second positioning structure being able to contact a corresponding tab and a metal connector to position the tab and the metal connector; and a welding structure, the welding structure having a welding component for welding; the welding base being movably arranged relative to the welding structure along the first direction, so that the welding component can switch between the plurality of second positioning structures; when the welding component corresponds to any position of a second positioning structure, the welding component can weld the tab and the metal connector at the second positioning structure together.

[0008] Furthermore, the first positioning structure is a first groove disposed on the solder pad, the shape of the first groove matching the shape of at least a portion of the outer surface of the battery cell.

[0009] Furthermore, the first groove has a first sidewall, a second sidewall, and a third sidewall. The first sidewall, the second sidewall, and the third sidewall are all used to contact the battery cell to position the battery cell. The first sidewall and the second sidewall are two sidewalls of the first groove that are opposite each other along a first direction. Along a second direction, the third sidewall is disposed at the first end of the first groove. The second end of the first groove is open so that the battery cell can be taken out from the second end of the first groove. The second direction is a direction perpendicular to the first direction, and the first end and the second end are two opposite ends of the first groove along the second direction.

[0010] Furthermore, the bottom surface of the second end of the first groove is provided with a first opening. When the electrode welding device is placed in the working state, the first opening extends to the bottom of the welding base, and along the second direction, the first opening extends to the edge of the welding base.

[0011] Furthermore, the second positioning structure is a second groove disposed on the welding base, at least a portion of the groove wall of the second groove can contact the electrode tab and the metal connector to position the electrode tab and the metal connector.

[0012] Furthermore, a second opening is provided on the third sidewall, which connects the first groove and the outer surface of the welding seat. The second positioning structure includes a blocking member disposed in the second opening to make contact positioning of the electrode tab and the metal connector through the inner surface of the second opening and the blocking member.

[0013] Furthermore, there are two blocking members, which are spaced apart along the first direction, and each blocking member forms a second positioning structure with the inner wall of the second opening.

[0014] Furthermore, the electrode welding device includes: a support base; a movable base movably mounted on the support base along a first direction, and a welding socket disposed on the movable base; and a locking structure configured to lock the movable base relative to the support base to prevent the movable base from moving along the first direction.

[0015] Furthermore, the movable seat and the support seat slide together, the locking structure has a first engaging part, the support seat has multiple second engaging parts, the multiple second engaging parts are spaced apart along the first direction, and the first engaging part can selectively engage with each of the second engaging parts so that the locking structure limits the movable seat to the corresponding position.

[0016] Furthermore, the metal connector has a welded portion and a non-welded portion, the welded portion being used for welding with the electrode lug, the welded portion and the non-welded portion being arranged at an angle, wherein: the edge corner of the welded portion is provided with a rounded corner structure, the radius of the rounded corner structure being in the range of 0.5mm to 1.0mm; and / or, the metal connector includes an electrode lug adhesive, the electrode lug adhesive being disposed on the non-welded portion, the distance between the electrode lug adhesive and the welded portion being less than or equal to 1.0mm.

[0017] The electrode welding device using the technical solution of this utility model includes: a welding base, on which a first positioning structure is provided, which can contact the battery cell to position the battery cell; the welding base is provided with multiple second positioning structures, which are arranged sequentially at intervals along a first direction, and each second positioning structure can contact a corresponding electrode and metal connector to position the electrode and metal connector; and a welding structure, which has welding components for welding. The welding base is movably arranged relative to the welding structure along the first direction so that the welding components can switch between the multiple second positioning structures. When the welding components correspond to any of the second positioning structures, the welding components can weld the electrode and metal connector at the second positioning structure together. With this structural design, the electrode welding device can position the battery cell through the first positioning structure on the welding base and position the electrode through the second positioning structures, thereby fixing the positions of the battery cell and electrode relatively, and then accurately pre-welding the battery cell and electrode. After pre-welding is completed, the metal connector can be positioned using the second positioning structure, thereby determining the relative position of the tab and the metal connector. This ensures that the welding components of the welding structure accurately weld the tab and the metal connector. By controlling the movement of the welding base along the first direction, the welding components can switch between multiple second positioning structures, thus welding multiple tabs to multiple metal connectors accordingly. The tab welding device with the above-described structure design can accurately position the cell, tab, and metal connector, avoiding relative misalignment of these components during welding. This helps ensure high welding accuracy and solves the technical problem of poor battery quality caused by insufficient positioning accuracy during welding in related technologies. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the electrode welding device of this utility model from a first perspective.

[0020] Figure 2 for Figure 1The dashed line in the middle shows an enlarged structural diagram of the area;

[0021] Figure 3 This is a schematic diagram of the electrode welding device of this utility model from a second perspective.

[0022] Figure 4 for Figure 3 The dashed line in the middle shows an enlarged structural diagram of the area;

[0023] Figure 5 This is a schematic diagram of the electrode welding device of this utility model from a third-person perspective.

[0024] Figure 6 for Figure 5 The dashed line in the middle shows an enlarged structural diagram of the area;

[0025] Figure 7 This is a partial structural schematic diagram of an embodiment of the electrode welding device of this utility model.

[0026] The above figures include the following reference numerals:

[0027] 1. Welding base; 11. First positioning structure; 111. First sidewall; 112. Second sidewall; 113. Third sidewall; 114. First opening; 12. Second positioning structure; 120. Second opening; 121. Blocking element;

[0028] 2. Welded structure; 21. Welded components;

[0029] 3. Support base; 31. Second snap-fit ​​mating part;

[0030] 4. Movable seat;

[0031] 5. Locking structure; 51. First snap-fit ​​mating part;

[0032] 10. Battery cells;

[0033] 101. Polar ear;

[0034] 102. Metal connector; 1021. Welded part; 1022. Non-welded part; 1023. Tab adhesive. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Please refer to Figures 1 to 7To address the technical problems described in the background section, embodiments of this utility model provide a tab welding device, comprising: a welding base 1, on which a first positioning structure 11 is provided, the first positioning structure 11 being able to contact a battery cell 10 to position the battery cell 10; a plurality of second positioning structures 12 are provided on the welding base 1, the plurality of second positioning structures 12 being arranged sequentially at intervals along a first direction, each second positioning structure 12 being able to contact a corresponding tab 101 and a metal connector 102 to position the tab 101 and the metal connector 102; and a welding structure 2, the welding structure 2 having a welding component 21 for welding, the welding base 1 being movably arranged relative to the welding structure 2 along the first direction so that the welding component 21 can switch between the plurality of second positioning structures 12; when the welding component 21 corresponds to any position of a second positioning structure 12, the welding component 21 can weld the tab 101 and the metal connector 102 at the second positioning structure 12 together.

[0037] The electrode welding device with this structural design can position the battery cell 10 through the first positioning structure 11 on the welding base 1 and the electrode 101 through the second positioning structure 12 during welding, thereby fixing the relative positions of the battery cell 10 and the electrode 101. Pre-welding between the battery cell 10 and the electrode 101 can then be performed accurately. After pre-welding, the metal connector 102 can be positioned through the second positioning structure 12, thereby positioning the relative positions of the electrode 101 and the metal connector 102. This allows the welding component 21 of the welding structure 2 to accurately weld the electrode 101 and the metal connector 102. By controlling the movement of the welding base 1 along the first direction, the welding component 21 can switch between multiple second positioning structures 12, thereby welding multiple electrodes 101 to multiple metal connectors 102 accordingly. The electrode welding device with the above-mentioned structural design can accurately position the battery cell 10, electrode 101 and metal connector 102 to avoid relative displacement of the above components during the welding process. This helps to ensure high welding accuracy and solves the technical problem of poor battery quality caused by insufficient positioning accuracy of electrode welding devices during the welding process in related technologies.

[0038] In one optional embodiment, welding structure 2 is an ultrasonic welding device, thereby enabling convenient and stable welding between the battery cell 10, the electrode tab 101, and the metal connector 102. In other embodiments, welding structure 2 may also employ other different structures depending on the actual welding requirements.

[0039] In an optional embodiment, the first positioning structure 11 is a first groove disposed on the solder pad 1, the shape of the first groove matching the shape of at least a portion of the outer surface of the battery cell 10.

[0040] In this embodiment, by setting the first positioning structure 11 as a first groove that matches the shape of at least a portion of the outer surface of the battery cell 10, the battery cell 10 can be accommodated and positioned through the first groove. This allows for rapid positioning of the battery cell 10 after placement via the inner wall of the first groove. In another optional embodiment, the first positioning structure 11 is a positioning clamp to hold and position the battery cell 10. Specifically, the positioning clamp includes a first clamping component and a second clamping component. The second clamping component is movably arranged in directions approaching and moving away from the first clamping component, thereby jointly clamping and positioning the battery cell 10. This allows for clamping of battery cells 10 of different sizes. The first clamping component is positionally adjustable relative to the welding structure 2. In this embodiment, the second clamping component moves closer to or further away from the first clamping component to achieve clamping. During this process, the first clamping component serves as a positioning reference. By setting it as a positionally adjustable structure, the reference position for welding can be flexibly adjusted according to actual welding requirements, satisfying different welding needs. Specifically, multiple mating structures can be set on the installation base, and the positioning fixture can selectively connect to any one of the mating structures to change its installation position and achieve position adjustment.

[0041] Specifically, the first groove has a first sidewall 111, a second sidewall 112, and a third sidewall 113. The first sidewall 111, the second sidewall 112, and the third sidewall 113 are all used to contact the battery cell 10 to position the battery cell 10. The first sidewall 111 and the second sidewall 112 are two sidewalls of the first groove that are opposite each other along the first direction. Along the second direction, the third sidewall 113 is disposed at the first end of the first groove. The second end of the first groove is open so that the battery cell 10 can be taken out from the second end of the first groove. The second direction is a direction perpendicular to the first direction, and the first end and the second end are two opposite ends of the first groove along the second direction.

[0042] In this way, the first sidewall 111 and the second sidewall 112 can be used to limit the contact between the two ends of the battery cell 10 along the first direction, and the third sidewall 113 can be used to limit the first end of the battery cell 10 along the second direction. Since the second end of the first groove is open, the battery cell 10 can be easily removed through the second end of the first groove, so as to facilitate the unloading operation after welding.

[0043] Optionally, the bottom surface of the second end of the first groove is provided with a first opening 114. When the electrode welding device is placed in the working state, the first opening 114 extends to the bottom of the welding base 1. The welding base 1 is a structure that supports the battery cell 10 to facilitate the welding of the battery cell 10. Therefore, the bottom of the welding base 1 is, as the name suggests, its lower surface when it is placed in the working state. Along the second direction, the first opening extends to the edge of the welding base 1.

[0044] like Figure 3 , Figure 4 and Figure 7 As shown, in this embodiment, a first opening 114 is provided on the bottom surface of the second end of the first groove. The upper and lower surfaces of the battery cell 10 can be easily pinched through the first opening 114, thereby providing a force point for the battery cell 10 to be picked up and put down, and further facilitating the picking up and putting down operation of the battery cell 10.

[0045] In an optional embodiment, the second positioning structure 12 is a second groove disposed on the welding base 1, and at least a portion of the groove wall of the second groove can contact the tab 101 and the metal connector 102 to position the tab 101 and the metal connector 102.

[0046] In an optional embodiment, the second positioning structure 12 is designed as a second groove on the welding base 1, thereby positioning the electrode 101 and the metal connector 102 by bringing them into contact with the inner wall of the second groove. Specifically, the electrode 101 and the metal connector 102 respectively contact at least one inner sidewall of the second groove to achieve positioning.

[0047] As an optional embodiment, a second opening 120 is provided on the third sidewall 113. The second opening 120 connects the first groove and the outer surface of the welding seat 1. The second positioning structure 12 includes a blocking member 121, which is disposed in the second opening 120 to make contact positioning of the electrode tab 101 and the metal connector 102 through the inner surface of the second opening 120 and the blocking member 121.

[0048] In another alternative embodiment, such as Figure 2 and Figure 6 As shown, a second opening 120 is provided on the third sidewall 113. The second opening 120 connects the first groove and the outer surface of the welding seat 1. Based on this, a blocking member 121 is provided in the second opening 120. The electrode tab 101 and the metal connector 102 are contacted and positioned by the blocking member 121 and the inner surface of the second opening 120 to restrict the position of the two and prevent them from exceeding the restricted position range, thus ensuring welding accuracy.

[0049] Optionally, there are two blocking members 121, which are spaced apart along the first direction. Each blocking member 121 forms a second positioning structure 12 with the inner wall of the second opening 120.

[0050] like Figure 2 and Figure 6As shown, in this embodiment, by designing multiple blocking members 121 spaced apart along the first direction, multiple second positioning structures 12 can be formed by the multiple blocking members 121 and the inner wall of the second opening 120, thereby achieving the positioning of multiple tabs 101 and corresponding metal connectors 102 through multiple second positioning structures, which is beneficial to simplifying the structure of the tab welding device.

[0051] In this embodiment, the electrode welding device includes: a support base 3; a movable base 4, which is movably mounted on the support base 3 along a first direction, and the welding base 1 is disposed on the movable base 4; and a locking structure 5, which is configured to lock the movable base 4 relative to the support base 3 to prevent the movable base 4 from moving along the first direction.

[0052] like Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, to enable the welding base 1 to move along the first direction, a support base 3 and a movable base 4 that can move relative to it along the first direction are designed. By moving the movable base 4 on the support base 3 along the first direction, the welding base 1 can be driven to move along the first direction, thereby realizing the position adjustment of the welding base 1 and changing the welding position. Based on this, by designing a locking structure 5, the movable base 4 and the support base 3 can be locked relative to each other, thereby realizing the positioning of the welding base 1.

[0053] As an optional implementation, the movable seat 4 and the support seat 3 are slidably engaged. The locking structure 5 has a first engaging part 51, and the support seat 3 has a plurality of second engaging parts 31. The plurality of second engaging parts 31 are spaced apart along a first direction. The first engaging part 51 can selectively engage with each of the second engaging parts 31 so that the locking structure 5 limits the movable seat 4 to the corresponding position.

[0054] In one specific embodiment, the first engaging part 51 is a protrusion and the second engaging part 31 is a groove. By engaging the protrusion into the groove, the locking structure 5 can be fixed on the support base 3, and then the locking structure 5 abuts against the movable base 4 to limit the movable base 4 to the corresponding position.

[0055] As an optional embodiment, the metal connector 102 has a welded portion 1021 and a non-welded portion 1022. The welded portion 1021 is used for welding to the tab 101. The welded portion 1021 and the non-welded portion 1022 are arranged at an angle. The welded portion 1021 has a rounded corner structure at its edge corner, with a radius ranging from 0.5 mm to 1.0 mm. Alternatively, the metal connector 102 includes tab adhesive 1023, which is disposed on the non-welded portion 1022. The distance between the tab adhesive 1023 and the welded portion 1021 is less than or equal to 1.0 mm. When the second positioning structure 12 positions the metal connector 102, it can contact the edge of the welded portion 1021 of the metal connector 102 to achieve positioning. The edge of the welding seat 1 can contact the non-welded portion 1022 and / or the tab adhesive 1023 to achieve auxiliary positioning of the metal connector 102.

[0056] In this embodiment, the structure of the metal connector 102 has been further optimized, such as... Figure 2 As shown, it includes a welded portion 1021 and a non-welded portion 1022. The welded portion 1021 is used for welding to the tab 101. The welded portion 1021 and the non-welded portion 1022 are arranged at an angle. This pre-bent metal connector 102 does not need to be bent again after welding, which avoids damage to the weld position and traction on the tab 101 and the cell 10 caused by bending after welding. This helps to ensure the reliability of the battery structure and reduce damage to the battery structure. By setting a rounded corner structure of 0.5mm to 1.0mm at the edge corner of the welded portion 1021, the risk of sharp edges puncturing the tab 101 can be reduced, improving the safety of the structure. By setting the distance between the tab adhesive 1023 and the welded portion 1021 to less than or equal to 1.0mm, the tab adhesive 1023 can better protect the weld position, improving the reliability of the structure after welding.

[0057] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0058] The electrode welding device of this utility model embodiment includes: a welding base 1, on which a first positioning structure 11 is provided, which can contact the battery cell 10 to position the battery cell 10; a plurality of second positioning structures 12 are provided on the welding base 1, which are arranged sequentially at intervals along a first direction, and each second positioning structure 12 can contact the corresponding electrode 101 and metal connector 102 to position the electrode 101 and metal connector 102; and a welding structure 2, which has a welding component 21 for welding. The welding base 1 is movably arranged relative to the welding structure 2 along the first direction so that the welding component 21 can switch between the plurality of second positioning structures 12. When the welding component 21 corresponds to any one of the second positioning structures 12, the welding component 21 can weld the electrode 101 and metal connector 102 at the second positioning structure 12. The electrode welding device with this structural design can position the battery cell 10 through the first positioning structure 11 on the welding base 1 and the electrode 101 through the second positioning structure 12 during welding, thereby fixing the relative positions of the battery cell 10 and the electrode 101. Pre-welding between the battery cell 10 and the electrode 101 can then be performed accurately. After pre-welding, the metal connector 102 can be positioned through the second positioning structure 12, thereby positioning the relative positions of the electrode 101 and the metal connector 102. This allows the welding component 21 of the welding structure 2 to accurately weld the electrode 101 and the metal connector 102. By controlling the movement of the welding base 1 along the first direction, the welding component 21 can switch between multiple second positioning structures 12, thereby welding multiple electrodes 101 to multiple metal connectors 102 accordingly. The electrode welding device with the above-mentioned structural design can accurately position the battery cell 10, electrode 101 and metal connector 102 to avoid relative displacement of the above components during the welding process. This helps to ensure high welding accuracy and solves the technical problem of poor battery quality caused by insufficient positioning accuracy of electrode welding devices during the welding process in related technologies.

[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0062] The above description is merely an optional embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tab welding device, characterized in that, include: A welding base (1) is provided with a first positioning structure (11), which can contact the battery cell (10) to position the battery cell (10). The welding base (1) is provided with a plurality of second positioning structures (12), which are arranged sequentially at intervals along a first direction. Each second positioning structure (12) can contact the corresponding tab (101) and metal connector (102) to position the tab (101) and the metal connector (102). A welding structure (2) having a welding component (21) for welding, wherein the welding base (1) is movably disposed relative to the welding structure (2) along the first direction so that the welding component (21) can be switched at a plurality of second positioning structures (12), wherein when the welding component (21) corresponds to any one of the second positioning structures (12), the welding component (21) can weld the tab (101) and the metal connector (102) at the second positioning structure (12).

2. The electrode tab welding device according to claim 1, characterized in that, The first positioning structure (11) is a first groove disposed on the solder pad (1), and the shape of the first groove matches the shape of at least a portion of the outer surface of the battery cell (10).

3. The electrode welding apparatus according to claim 2, characterized in that, The first groove has a first sidewall (111), a second sidewall (112), and a third sidewall (113). The first sidewall (111), the second sidewall (112), and the third sidewall (113) are all used to contact the battery cell (10) to position the battery cell (10). The first sidewall (111) and the second sidewall (112) are two sidewalls of the first groove that are opposite each other along the first direction. Along the second direction, the third sidewall (113) is disposed at the first end of the first groove. The second end of the first groove is open so that the battery cell (10) can be taken out from the second end of the first groove. Wherein, the second direction is a direction perpendicular to the first direction, and the first end and the second end are the two opposite ends of the first groove along the second direction.

4. The electrode welding device according to claim 3, characterized in that, The bottom surface of the second end of the first groove is provided with a first opening (114). When the electrode welding device is in the working state, the first opening (114) extends to the bottom of the welding base (1) and extends to the edge of the welding base (1) along the second direction.

5. The electrode tab welding apparatus according to any one of claims 1 to 4, characterized in that, The second positioning structure (12) is a second groove provided on the welding base (1). At least a portion of the groove wall of the second groove can contact the electrode (101) and the metal connector (102) to position the electrode (101) and the metal connector (102).

6. The electrode welding apparatus according to claim 3, characterized in that, The third sidewall (113) is provided with a second opening (120), which connects the first groove and the outer surface of the welding seat (1). The second positioning structure (12) includes a blocking member (121), which is disposed in the second opening (120) to make contact positioning of the electrode (101) and the metal connector (102) through the inner surface of the second opening (120) and the blocking member (121).

7. The electrode welding apparatus according to claim 6, characterized in that, There are two blocking members (121), which are spaced apart along the first direction. Each blocking member (121) forms a second positioning structure (12) with the inner wall of the second opening (120).

8. The electrode tab welding apparatus according to any one of claims 1 to 4, characterized in that, The electrode welding device includes: Support base (3); Movable seat (4), the movable seat (4) is movably mounted on the support seat (3) along the first direction, and the welding seat (1) is disposed on the movable seat (4); A locking structure (5) is configured to lock the movable seat (4) relative to the support seat (3) to prevent the movable seat (4) from moving in the first direction.

9. The electrode welding apparatus according to claim 8, characterized in that, The movable seat (4) is slidably engaged with the support seat (3). The locking structure (5) has a first engaging part (51). The support seat (3) has a plurality of second engaging parts (31). The plurality of second engaging parts (31) are spaced apart along the first direction. The first engaging part (51) can selectively engage with each of the second engaging parts (31) so that the locking structure (5) limits the movable seat (4) to the corresponding position.

10. The electrode tab welding apparatus according to any one of claims 1 to 4, characterized in that, The metal connector (102) has a welded portion (1021) and a non-welded portion (1022). The welded portion (1021) is used for welding to the electrode tab (101). The welded portion (1021) and the non-welded portion (1022) are arranged at an angle, wherein: The welded part (1021) has a rounded corner structure at its edge corner, the radius of which ranges from 0.5 mm to 1.0 mm; and / or, The metal connector (102) includes tab adhesive (1023), which is disposed on the non-welded part (1022), and the distance between the tab adhesive (1023) and the welded part (1021) is less than or equal to 1.0 mm.

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