Tab welding fixture and welding equipment

Abstract

The utility model discloses a tab welding fixture and welding equipment, the tab welding fixture comprises a fixture main body, a clamping assembly, a first driving mechanism and a second driving mechanism, the fixture main body is used for placing two aligned naked battery cells, and the clamping assembly used for clamping a top cover assembly is located on one side of the fixture main body in a first direction; the first driving mechanism is connected with the clamping assembly, the first driving mechanism is used for driving the clamping assembly to move in the second direction so as to adjust the positions of the top cover assembly relative to the two naked battery cells, and the second driving mechanism is arranged on the clamp main body and connected with the first driving mechanism; and the second driving mechanism is used for driving the first driving mechanism to approach the clamp main body along the first direction so as to drive the top cover pin of the top cover assembly to extend between the same-polarity tabs of the two naked battery cells. According to the technical scheme, alignment connection of the top cover pins and the same-polarity tabs of the two naked battery cells can be achieved, the welding quality of the tabs can be improved, and therefore the qualified rate of products can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell manufacturing, and in particular to a tab welding fixture and welding equipment. Background Art

[0002] In recent years, with the development of new energy technologies, energy storage products have become increasingly important in people's daily lives. Lithium battery cells, as one of the electrochemical energy storage technologies, have the advantages of small size, light weight, high energy density, good safety performance, and long cycle life. They have been widely used in various industries such as vehicles, electronic products, and energy storage systems.

[0003] During the lithium battery cell production process, pairing and joining two independent bare cells is a core step in the mid-stage production of lithium batteries. When joining the cells, the top cover pins (i.e., adapters) are required to weld the like-sex tabs of the two bare cells together. The quality of the welding directly affects the quality of the lithium battery. However, during the cell welding process, the top cover pins and the two bare cells are easily misaligned, resulting in the top cover pins being unable to be inserted into the tabs or the top cover pins being incorrectly positioned between the tabs after insertion, causing problems such as poor tab welding or a low product qualification rate. Utility Model Content

[0004] The embodiment of the present application discloses a tab welding fixture and welding equipment, which can avoid inaccurate alignment between the top cover pins and the same-sex tabs of two bare battery cells, which is beneficial to improving the welding quality of the tabs and further beneficial to improving the qualified rate of the product.

[0005] To achieve the above objectives, in a first aspect, an embodiment of the present application discloses a tab welding fixture, comprising:

[0006] A fixture body, the fixture body being configured to hold two bare cells arranged in opposite positions, with like-polarity tabs of the two bare cells facing each other;

[0007] a clamping assembly, the clamping assembly being located on one side of the clamp body along the first direction, the clamping assembly being configured to clamp the top cover assembly;

[0008] a first driving mechanism, the first driving mechanism being connected to the clamping assembly, the first driving mechanism being configured to drive the clamping assembly to move the top cover assembly in a second direction, so as to adjust the position of the top cover assembly relative to the two bare cells; and

[0009] a second driving mechanism, the second driving mechanism being disposed on the fixture body and connected to the first driving mechanism, the second driving mechanism being configured to drive the first driving mechanism to move the top cover assembly along the first direction toward the fixture body, so that the top cover pins of the top cover assembly extend between the like-polarity tabs of the two bare cells;

[0010] The first direction and the second direction intersect.

[0011] The tab welding fixture provided in the embodiment of the present application can drive the clamping assembly to move in the second direction through the first driving mechanism, and adjust the center of the top cover assembly to be flush with the centers of the two bare battery cells in the second direction, so that the top cover pins of the top cover assembly can be accurately extended between the same-sex tabs of the two bare battery cells under the drive of the second driving mechanism, thereby realizing the alignment connection between the top cover pins and the same-sex tabs of the two bare battery cells, which is beneficial to improving the welding quality of the tabs, and further beneficial to improving the qualified rate of the product.

[0012] As an optional embodiment, the clamping assembly includes a fixing member, an adjusting member, and a clamping member, wherein the fixing member is connected to the first driving mechanism, the adjusting member is provided on a side of the fixing member close to the clamp body, the clamping member is connected to the adjusting member, the clamping member has a clamping space for clamping the top cover assembly, and the adjusting member is configured to adjust the size of the clamping space formed by the clamping member. With this embodiment, on the one hand, the fixing member and the adjusting member are used to achieve a fixed connection of the clamping member; on the other hand, the size of the clamping space of the clamping member can be adjusted by the adjusting member, thereby achieving clamping of the top cover assembly and adapting to top cover assemblies of different specifications.

[0013] As an optional embodiment, the adjusting member and the clamping member are both provided in pairs, the two adjusting members are provided on the fixing member at intervals along the third direction, and each clamping member is connected to a corresponding adjusting member;

[0014] The third direction intersects with the first direction and the second direction.

[0015] By arranging the adjusting parts and the clamping parts on both sides of the fixing part along the third direction, the clamping assembly can clamp the top cover assembly more firmly, thereby avoiding the skewing of the top cover assembly due to unstable clamping, thereby avoiding the misalignment between the top cover pins and the two bare battery cells due to the skewing of the top cover assembly, and thus being beneficial to improving the welding quality of the tabs.

[0016] As an optional embodiment, the clamping assembly further includes a buffer, which is provided on the clamping member and located in the clamping space. The buffer is provided with a positioning groove, and the positioning groove is configured to clamp the top cover assembly. The buffer can buffer the space between the clamping member and the top cover assembly, thereby avoiding damage to the top cover assembly when the clamping member clamps the top cover assembly, which is beneficial to improving the yield of the product. In addition, by providing a positioning groove on the buffer, the top cover assembly can be further positioned to prevent the top cover assembly from being offset or skewed during the process of being clamped or inserted between the same-sex tabs of two bare battery cells.

[0017] As an optional embodiment, the tab welding fixture further includes two bending components, the two bending components are respectively arranged on both sides of the fixture body along the third direction, and the bending components are configured to bend the same-sex tabs of the bare battery cell so that the same-sex tabs of the two bare battery cells abut against the top cover pins;

[0018] The third direction is a direction intersecting with both the first direction and the second direction.

[0019] In this way, the tabs of the two bare cells can be bent by the two bending components to achieve the connection between the tabs and the top cover pins.

[0020] As an optional embodiment, the bending component includes a support frame, a bending drive, a first sub-bending member and a second sub-bending member, the support frame is arranged on one side of the clamp body along the third direction, the bending drive is arranged on the support frame, the first sub-bending member and the second sub-bending member are both connected to the bending drive, and the first sub-bending member and the second sub-bending member are arranged facing each other along the second direction, and the bending drive is configured to drive the first sub-bending member and the second sub-bending member to approach each other along the second direction, so that the same-sex tabs of the two bare cells are bent toward the top cover pin to abut against the top cover pin. In this way, the bending drive adjusts the first sub-bending member and the second sub-bending member to approach each other in the second direction, so as to realize the bending of the same-sex tabs of the bare cells toward each other, thereby bending the tabs toward the top cover pin, thereby realizing the connection of the same-sex tabs of the two bare cells with the same top cover pin.

[0021] As an optional embodiment, the tab welding fixture further includes a tab pressing mechanism, which includes two tab pressing members, which are sequentially arranged at both ends of the fixture body along the third direction, and the tab pressing members are configured to move toward each other along the third direction so that the top cover pins are pressed against the same-sex tabs of the two bare cells. Since the tabs need to be kept in close contact with the top cover pins during tab welding in order to achieve a good welding effect, the two tab pressing members on both sides of the fixture body in the third direction move toward each other along the third direction, which can maintain the connection between the tab and the top cover pin after bending, and make the connection tight, which is beneficial to improving the welding quality of the tabs, and further beneficial to improving the qualified rate of the product.

[0022] As an optional embodiment, the tab pressing mechanism further includes a pressing drive and a pressing transmission assembly, wherein the pressing drive is provided at one end of the clamp body along the third direction, the pressing transmission assembly is connected to the pressing drive, and both tab pressing members are connected to the pressing transmission assembly, and the pressing drive is configured to drive the two tab pressing members to synchronously move toward each other along the third direction. With this embodiment, on the one hand, the tab pressing members are driven by the pressing drive and the pressing transmission assembly; on the other hand, the two tab pressing members can synchronously press the tabs on both sides of the two bare cells through the synchronous movement of the two tab pressing members toward each other along the third direction, thereby avoiding the situation in which the surface of the bare cells is worn when a single tab pressing member pushes the two bare cells to press against the other tab pressing member.

[0023] As an optional embodiment, the compression transmission assembly is connected to the compression driving member, and the compression transmission assembly includes a first pulley, a second pulley, a synchronous belt, a first slider and a second slider, the first pulley and the second pulley are sequentially arranged at two ends of the clamp body along the third direction, the first pulley is connected to the compression driving member, the synchronous belt is sleeved on the first pulley and the second pulley, the first slider and the second slider are arranged at two ends of the clamp body along the third direction, the first slider and the second slider are connected to the synchronous belt on opposite sides, and the first slider and the second slider are located between the first pulley and the second pulley, and the first slider and the second slider are respectively connected to the two tab pressing members;

[0024] The two ends of the clamp body are respectively provided with a first guide rail and a second guide rail extending along the third direction, the first slider is slidably connected to the first guide rail, and the second slider is slidably connected to the second guide rail;

[0025] The pressing driving member drives the first pulley to rotate, and drives the synchronous belt and the second pulley to rotate, so as to drive the first slider and the second slider to move toward or away from each other along the third direction.

[0026] The use of a transmission method in which the first and second sliders are connected to the synchronous belt on opposite sides reduces the number of clamping drive components and saves manufacturing costs for the tab welding fixture. Furthermore, the first and second sliders slide in conjunction with the first and second guide rails, respectively, making the movement of the tab clamp smoother and more stable. Furthermore, the first and second guide rails can guide the movement of the tab clamp, preventing deviations in its trajectory.

[0027] As an optional embodiment, the tab pressing member is provided with an escape opening penetrating along the third direction;

[0028] The first sub-bending member includes a first main body and a plurality of first teeth, wherein the plurality of first teeth are sequentially arranged on the first main body along the first direction;

[0029] The second sub-bending member includes a second main body and a plurality of second teeth, and the plurality of second teeth are sequentially arranged on the second main body along the first direction;

[0030] The avoidance opening is configured to allow a portion of the first tooth portion and a portion of the second tooth portion to extend therein to bend the same-sex tabs of the two bare battery cells.

[0031] By partially extending the first and second teeth into the avoidance openings on the tab pressing member, the first and second teeth respectively abut against the tabs of the same sex on the two bare cells, allowing the first and second sub-bending members to bend the tabs of the same sex on the two bare cells through the first and second teeth, respectively. This embodiment also makes the overall structure of the tab welding fixture more compact.

[0032] As an optional embodiment, the avoidance opening includes a first sub-avoidance opening and two second sub-avoidance openings, wherein the first sub-avoidance opening and the two second sub-avoidance openings are sequentially spaced along the first direction, the first sub-avoidance opening is configured to provide welding space for the same-pole tabs of the two bare cells, and to allow each of the first teeth and each of the second teeth to partially extend therein to bend the same-pole tabs of the two bare cells, and the second sub-avoidance opening is configured to allow each of the first teeth and each of the second teeth to partially extend therein to bend the same-pole tabs of the two bare cells. The first sub-avoidance opening can provide welding space for the welding head, allowing the welding head to extend into the first sub-avoidance opening and abut against the tab, thereby facilitating improved tab welding quality. In addition, the first sub-avoidance and the two second sub-avoidances are arranged in sequence along the first direction, so that space can be provided for the first tooth portion and the second tooth portion to extend into to bend the pole ear, and the pole ear can be compressed through the part between the first sub-avoidance and the two second sub-avoidances to keep the same-sex pole ears of the two bare battery cells in close contact with the top cover pins.

[0033] As an optional embodiment, the tab welding fixture further includes a pin supporting structure, the pin supporting structure includes a supporting driving member and a pin supporting member, and the supporting driving member is provided on the fixture body;

[0034] The pin support member includes a connecting portion and two supporting sub-portions, the connecting portion is connected to the supporting driving member, the two supporting sub-portions are spaced apart from the connecting portion, and the two supporting sub-portions are respectively arranged corresponding to the two top cover pins of the top cover assembly;

[0035] The support driving member is configured to drive the connecting portion to approach the two bare cells along the first direction, so that each supporting sub-portion extends between the same-sex tabs of the two bare cells and abuts against the corresponding top cover pin.

[0036] Since the tabs need to maintain the position of the top cover pins during welding, the contact between the support sub-sections on the pin support structure and the corresponding top cover pins can provide support force for the top cover pins, keeping the top cover pins in the required position for welding and preventing the top cover pins from tilting. This is beneficial for improving the welding quality between the tabs and the top cover pins, thereby improving the qualified rate of the product. In addition, the support driving member can realize the driving of the two support sub-sections so that the support sub-sections can abut against the top cover pins.

[0037] As an optional embodiment, the clamp body includes a first substrate and a second substrate, the second substrate is arranged above the first substrate along the second direction, the second driving mechanism is arranged on the first substrate, and the second driving mechanism is located between the first substrate and the second substrate, and the second substrate is configured to place the two bare cells;

[0038] The clamping assembly and the first driving mechanism are arranged on one side of the first substrate along the first direction.

[0039] The first substrate can provide support for other components of the tab welding fixture, thereby facilitating modularization and integration of the tab welding fixture. Furthermore, by arranging the second drive mechanism between the first substrate and the second substrate, the tab welding fixture becomes more compact.

[0040] As an optional embodiment, the first drive mechanism drives the clamping assembly, and the clamping assembly drives the top cover assembly to approach the two bare cells along the second direction, so that the height difference between the center of the top cover assembly and the center of the two bare cells along the second direction is less than or equal to 0.4 mm. By controlling the height difference between the center of the top cover assembly and the center of the two bare cells in the second direction, the connection between the top cover pins and the same-sex tabs of the two bare cells is made more reliable and tighter, thereby improving the welding quality of the top cover pins and the tabs, and further improving the qualified rate of the product.

[0041] In a second aspect, embodiments of the present application further disclose a welding device comprising the tab welding fixture described in the first aspect. The welding device comprising the tab welding fixture can also achieve aligned connection between the top cover pins and the tabs of the same sex on two bare cells, thereby improving the tab welding quality and product qualification rate.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] The embodiments of the present application provide a tab welding fixture and welding equipment. The tab welding fixture can adjust the center of the top cover assembly to be aligned or roughly aligned with the center of the two bare battery cells in the second direction because the first driving mechanism can drive the clamping assembly to move along the second direction, so that the top cover pins of the top cover assembly can be accurately extended between the like tabs of the two bare battery cells under the drive of the second driving mechanism, thereby realizing the alignment connection between the top cover pins and the like tabs of the two bare battery cells, which is beneficial to improving the welding quality of the tabs and further beneficial to improving the qualified rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 This is a structural diagram of a tab welding fixture provided in an embodiment of the present application from one perspective;

[0046] Figure 2 1 is a structural schematic diagram of the tab welding fixture provided in an embodiment of the present application from another perspective;

[0047] Figure 3 Schematic diagram of the structure of the tab welding fixture (without placing a bare battery cell) provided in an embodiment of the present application;

[0048] Figure 4 Schematic diagram of the structure of the tab welding fixture (including the bending component) provided in an embodiment of the present application;

[0049] Figure 5 It is a structural schematic diagram of the bending component provided in an embodiment of the present application;

[0050] Figure 6 Schematic diagram of the structure of the tab welding fixture (excluding the second substrate) provided in an embodiment of the present application;

[0051] Figure 7 It is a structural schematic diagram of the welding equipment provided in an embodiment of the present application.

[0052] Description of reference numerals:

[0053] 100-tab welding fixture; 1-fixture body; 11-first substrate; 12-second substrate; 121-clamping avoidance; 13-third substrate; 131-first guide rail; 132-second guide rail; 2-clamping assembly; 21-fixing member; 22-adjusting member; 23-clamping member; 24-buffer member; 241-positioning groove; 3-first driving mechanism; 4-second driving mechanism; 5-bending member; 51-support frame; 52-bending driving member; 53-first sub-bending member; 531-first main body; 532-first tooth portion; 54-second sub-bending member; 541-second main body; 542-second tooth portion; 6-tab pressing mechanism ;61-ear tab pressing member;611-avoidance;611a-first sub-avoidance;611b-second sub-avoidance;612-avoidance groove;62-pressing drive member;63-pressing transmission assembly;631-first pulley;632-second pulley;633-synchronous belt;634-first slider;635-second slider;7-pin supporting structure;71-supporting drive member;72-pin supporting member;721-connecting part;722-supporting sub-part;200-welding equipment;X-first direction;Y-second direction;Z-third direction;800-bare battery cell;801-ear;900-top cover assembly;901-top cover pin. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] In this application, the terms "upper" and "lower" and other terms indicating positions or locations are based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0056] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0057] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0058] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0059] With the development of new energy, energy storage products are gaining increasing attention. Lithium-ion battery cells, due to their small size, light weight, high energy density, excellent safety performance, and long cycle life, are widely used in various industries, including vehicles, electronic products, and energy storage systems.

[0060] In the core process of mid-stage lithium battery cell production, two independent bare cells need to be paired and joined. When joining the cells, the top cover pins (i.e., adapters) need to be used to weld the like-sex tabs of the two bare cells together. The quality of the welding will directly affect the quality of the lithium battery. In related technologies, when welding the battery cells, it is easy for the top cover pins to be misaligned with the two bare cells, resulting in the top cover pins being unable to insert into the tabs or the top cover pins being incorrectly positioned between the tabs after insertion, resulting in poor tab welding or low product qualification rates.

[0061] To address the above issues, the inventors attempted to use two bare cells that were already aligned during the process of mating the battery cell with the top cover pins, so that the top cover pins could be better inserted between the same-sex tabs of the two bare cells. Although this method can, to a certain extent, make it easier for the top cover pins to be inserted between the same-sex tabs of the two bare cells, when there is a height difference between the top cover pins and the same-sex tabs of the two bare cells, it can still cause the top cover pins to be unable to insert into the tabs or the top cover pins to be incorrectly positioned between the tabs after insertion, resulting in poor tab welding or a low product qualification rate.

[0062] In view of this point, an embodiment of the present application provides a tab welding fixture and welding equipment. The tab welding fixture can adjust the center of the top cover assembly in the height direction to be roughly aligned with the center of the two bare battery cells through a first driving mechanism, and can achieve the alignment connection between the top cover pins and the same-sex tabs of the two bare battery cells, which is beneficial to improving the welding quality of the tabs, and further beneficial to improving the product qualification rate.

[0063] The technical solution of this application will be further described below with reference to specific embodiments and drawings.

[0064] See also Figure 1 and Figure 2 , Figure 1 This is a structural diagram of a tab welding fixture provided in an embodiment of the present application from one perspective; Figure 2It is a structural diagram of the tab welding fixture provided by the embodiment of the present application from another perspective. On the one hand, the embodiment of the present application discloses a tab welding fixture 100, which includes a fixture body 1, a clamping assembly 2, a first drive mechanism 3 and a second drive mechanism 4. The fixture body 1 is configured to place two bare cells 800 arranged in opposite positions, and the same-sex tabs 801 of the two bare cells 800 are arranged facing each other. The clamping assembly 2 is located on one side of the fixture body 1 along the first direction X. The clamping assembly 2 is configured to clamp the top cover assembly 900. The first drive mechanism 3 is connected to the clamping assembly 2, and the first drive mechanism 3 is configured to drive The clamping assembly 2 drives the top cover assembly 900 to move in the second direction Y to adjust the position of the top cover assembly 900 relative to the two bare battery cells 800. The second driving mechanism 4 is arranged on the clamp body 1. The second driving mechanism 4 is connected to the first driving mechanism 3. The second driving mechanism 4 is configured to drive the first driving mechanism 3 to drive the top cover assembly 900 to move along the first direction X close to the clamp body 1, so that the top cover pin 901 of the top cover assembly 900 extends between the like-sex tabs 801 of the two bare battery cells 800; wherein the first direction X and the second direction Y intersect.

[0065] The tab welding fixture 100 provided in the embodiment of the present application can drive the clamping assembly 2 to move along the second direction Y through the first driving mechanism 3, and adjust the center of the top cover assembly 900 to be flush or approximately flush with the centers of the two bare battery cells 800 in the second direction Y, so that the top cover pin 901 of the top cover assembly 900 can be accurately extended between the same-sex tabs 801 of the two bare battery cells 800 under the drive of the second driving mechanism 4, thereby realizing the alignment connection between the top cover pin 901 and the same-sex tabs 801 of the two bare battery cells 800, which is beneficial to improving the welding quality of the tab 801, and further beneficial to improving the qualified rate of the product.

[0066] It can be understood that the above-mentioned first direction X can be the direction from the center of the paper to the upper left corner of the paper, and the second direction Y can be the upward direction of the paper. Of course, the above-mentioned first direction X and second direction Y can also be reversed. The above-mentioned first direction X and second direction Y are only examples for ease of understanding and do not limit the scope of this application.

[0067] As an optional embodiment, the first drive mechanism 3 drives the clamping assembly 2, and the clamping assembly 2 drives the top cover assembly 900 to approach the two bare cells 800 along the second direction Y, so that the height difference between the center of the top cover assembly 900 and the center of the two bare cells 800 along the second direction Y is less than or equal to 0.4 mm. By controlling the height difference between the center of the top cover assembly 900 and the center of the two bare cells 800 in the second direction Y, when the same-sex tabs 801 of the two bare cells 800 are connected to the top cover pins 901, it is possible to avoid the situation where one of the tabs 801 abuts against the top cover pins 901 while the other tab 801 does not abut against the top cover pins 901, making the connection between the top cover pins 901 and the same-sex tabs 801 of the two bare cells 800 more reliable and tighter, thereby facilitating the improvement of the welding quality between the top cover pins 901 and the tabs 801, and further facilitating the improvement of the qualified rate of the product.

[0068] As an optional embodiment, the fixture body 1 includes a first substrate 11 and a second substrate 12, the second substrate 12 being spaced apart above the first substrate 11 along the second direction Y. The second drive mechanism 4 is disposed on the first substrate 11 and located between the first and second substrates 11, 12. The second substrate 12 is configured to accommodate two bare battery cells 800. The clamping assembly 2 and the first drive mechanism 3 are disposed on one side of the first substrate 11 along the first direction X. The first substrate 11 can provide support for other components of the tab welding fixture 100, thereby facilitating the modularization and integration of the tab welding fixture 100. Furthermore, by disposing the second drive mechanism 4 between the first and second substrates 11, 12, the intermediate space can be effectively utilized, thereby improving the space utilization of the tab welding fixture 100, reducing the footprint of the tab welding fixture 100, and making the structure of the tab welding fixture 100 more compact.

[0069] Alternatively, as Figure 1 and Figure 2 As shown, the above-mentioned clamp body 1 also includes a third substrate 13, and the third substrate 13 is arranged between the first substrate 11 and the second substrate 12 along the second direction Y. The first substrate 11, the third substrate 13, and the second substrate 12 are connected by support columns. The second driving mechanism 4 is located between the first substrate 11 and the third substrate 13, and there is an installation space between the third substrate 13 and the second substrate 12 for accommodating other components (this will be introduced below).

[0070] For example, the first direction X may be a width direction of the first substrate 11 , and the second direction Y may be a thickness direction of the first substrate 11 .

[0071] Alternatively, the first drive mechanism 3 may be implemented in a variety of ways. For example, it may be driven by a cylinder. Alternatively, it may be driven by a motor and a rack and pinion. Alternatively, it may be driven by a motor and a ball screw. Alternatively, it may be driven by an electric cylinder, etc., which are not limited in this embodiment.

[0072] For example, Figure 1 and Figure 2 As shown, the first drive mechanism 3 is configured to be driven by an electric cylinder. The electric cylinder is positioned on one side of the fixture body 1 along the first direction X. The drive end of the electric cylinder is connected to the clamping assembly 2. The electric cylinder is configured to drive the clamping assembly 2 to move the top cover assembly 900 in the second direction Y. Due to the high integration, high precision, and high repeatability of electric cylinders, the adoption of an electric cylinder drive approach, on the one hand, directly connects the drive end of the electric cylinder to the clamping assembly 2, thereby reducing the need for external components and simplifying system design and maintenance. On the other hand, it enables more precise control of the movement of the clamping assembly 2 in the second direction Y, facilitating high-precision position control and repeatable positioning; and, furthermore, provides consistent precision and repeatability for each movement of the clamping assembly 2.

[0073] Alternatively, the second drive mechanism 4 may be implemented in a variety of ways. For example, it may be driven by a cylinder. Alternatively, it may be driven by a motor and a rack and pinion. Alternatively, it may be driven by a motor and a ball screw. Alternatively, it may be driven by an electric cylinder, etc., which are not limited in this embodiment.

[0074] For example, Figure 2 As shown, the second drive mechanism 4 is configured to be driven by an electric cylinder. The electric cylinder is mounted on the fixture body 1 and connected to the first drive mechanism 3. The electric cylinder is configured to drive the first drive mechanism 3 to move the top cover assembly 900 in a first direction X toward the fixture body 1, so that the top cover pins 901 of the top cover assembly 900 extend between the like-sex tabs 801 of the two bare battery cells 800. The first direction X and the second direction Y intersect. Due to the high integration, high precision, and high repeatability of electric cylinders, the adoption of an electric cylinder drive approach reduces the need for external components and simplifies system design and maintenance by directly connecting the drive end of the electric cylinder to the first drive mechanism 3. Furthermore, it enables more precise control of the movement of the first drive mechanism 3 and the clamping assembly 2 in the first direction X, facilitating high-precision position control and repeatable positioning. Furthermore, it provides consistent accuracy for each movement of the first drive mechanism 3 and the clamping assembly 2.

[0075] Please combine Figure 3 , Figure 3It is a structural diagram of the tab welding fixture (without placing a bare cell) provided in an embodiment of the present application. As an optional embodiment, the clamping assembly 2 includes a fixing member 21, an adjusting member 22 and a clamping member 23. The fixing member 21 is connected to the first driving mechanism 3. The adjusting member 22 is arranged on the side of the fixing member 21 close to the fixture body 1. The clamping member 23 is connected to the adjusting member 22. The clamping member 23 has a clamping space for clamping the top cover assembly 900. The adjusting member 22 is configured to adjust the size of the clamping space formed by the clamping member 23. With this embodiment, on the one hand, the fixing member 21 and the adjusting member 22 are used to achieve a fixed connection of the clamping member 23; on the other hand, the size of the clamping space of the clamping member 23 can be adjusted by the adjusting member 22, so that the top cover assembly 900 can be clamped, and it can adapt to top cover assemblies 900 of different specifications.

[0076] Optionally, the fixing member 21 includes but is not limited to a support frame 51 , a support plate, etc., which is not limited in this embodiment.

[0077] Optionally, the adjusting member 22 may be implemented in a variety of ways. For example, it may be driven by an electric cylinder. Alternatively, it may be driven by a pneumatic cylinder. Alternatively, it may be driven by a hydraulic cylinder. Alternatively, it may be driven by a stepping motor in conjunction with a gear or rack. Alternatively, it may be driven by an electric drive motor in conjunction with a gear or rack, etc. This embodiment is not limited to this.

[0078] Optionally, the clamping member 23 includes but is not limited to a clamp, a clamp, a manipulator, etc., which is not limited in this embodiment. Figure 3 As shown, the clamping member 23 is configured as a clamping claw. The clamping claw can provide higher positioning accuracy for the clamping assembly 2; and the clamping claw can provide a uniform clamping force for the top cover assembly 900, reducing the deviation of the top cover assembly 900 during movement.

[0079] It is understandable that, in addition to the gripping of the top cover assembly 900 by the clamping member 23 as described above, the gripping of the top cover assembly 900 by the clamping assembly 2 may also be achieved by, for example, a suction cup.

[0080] In order to improve the stability of the clamping assembly 2 during the movement of the clamping top cover assembly 900 and prevent the top cover assembly 900 from tilting, the clamping assembly 2 can be provided with multiple adjustment members 22 and multiple clamping members 23 to improve the clamping stability of the top cover assembly 900. Specifically, two adjustment members 22 and two clamping members 23 can be provided; or three adjustment members 22 and three clamping members 23 can be provided; or four adjustment members 22 and four clamping members 23 can be provided, etc., which is not limited in this embodiment.

[0081] For example, Figure 3As shown, there are two adjusting members 22 and two clamping members 23, and the two adjusting members 22 are spaced apart on the fixing member 21 along the third direction Z. Each clamping member 23 is connected to a corresponding adjusting member 22, wherein the third direction Z intersects with the first direction X and the second direction Y. By providing the adjusting members 22 and the clamping members 23 on both sides of the fixing member 21 along the third direction Z, the clamping assembly 2 can clamp the top cover assembly 900 more firmly, thereby preventing the top cover assembly 900 from being skewed due to unstable clamping, thereby preventing the top cover pin 901 from being misaligned with the two bare cells 800 due to the skew of the top cover assembly 900, and thus improving the welding quality of the tab 801.

[0082] In addition, when the clamping member 23 clamps the top cover assembly 900, a collision may occur between the clamping member 23 and the top cover assembly 900. Therefore, a buffer member 24 can be provided on the clamping member 23 to protect the top cover assembly 900. Specifically, Figure 3 As shown, the clamping assembly 2 further includes a buffer member 24, which is disposed on the clamping member 23 and located in the clamping space. The buffer member 24 is provided with a positioning groove 241, which is configured to clamp the top cover assembly 900. The buffer member 24 can provide a buffer between the clamping member 23 and the top cover assembly 900, thereby preventing damage to the top cover assembly 900 when the clamping member 23 clamps the top cover assembly 900, which is beneficial to improving the product yield.

[0083] In addition, by providing a positioning groove 241 on the buffer member 24, the top cover assembly 900 can be further positioned to prevent the top cover assembly 900 from being offset or skewed when being clamped or inserted between the same-sex tabs 801 of two bare battery cells 800.

[0084] Optionally, the material of the buffer member 24 includes rubber, silicone, polyurethane, foam, etc., which is not limited in this embodiment. Exemplarily, the material of the buffer member 24 is rubber. Since rubber has excellent wear resistance, elasticity, shock absorption performance, and recovery ability, the buffer member 24 can buffer the collision between the clamp member 23 and the top cover assembly 900, so that the clamp member 23 and the top cover assembly 900 are flexibly abutted, which is beneficial to protecting the top cover assembly 900 from damage, thereby improving the product yield.

[0085] Since the tabs 801 of the bare cells 800 are generally arranged to extend along their length or width, during the core closing operation, after the top cover assembly 900 is matched with the two bare cells 800, the top cover pins 901 are located on the side of the bare cells 800. For the convenience of explanation, the tabs 801 of the bare cells 800 are extended along their length as an example. When welding the tabs 801, the top cover assembly 900 is first matched with the two bare cells 800. At this time, the tabs 801 of the same sex of the two bare cells 800 are parallel to each other, and the top cover pins 901 are located between the tabs 801 of the same sex of the two bare cells 800, and the top cover pins 901 and the tabs 801 are perpendicular to each other (or at an angle). In order to make the tabs 801 abut against the top cover pins 901, the tabs 801 need to be bent around the bare cells 800 toward the top cover pins 901, so that the tabs 801 and the top cover pins 901 fit together. Afterwards, the tab 801 is kept in contact with the top cover pin 901, and then the tab 801 and the top cover pin 901 are welded by a welding device to fix the tab 801 and the top cover pin 901. Therefore, before welding the tab 801, the tab 801 needs to be bent so that the tab 801 and the top cover pin 901 are in contact. In addition, the tab 801 and the top cover pin 901 need to be kept in contact. The following is a detailed description of the method for bending the tab 801 and keeping the tab 801 and the top cover pin 901 in contact:

[0086] Please combine Figure 4 and Figure 5 , Figure 4 Schematic diagram of the structure of the tab welding fixture (including the bending component) provided in an embodiment of the present application; Figure 5 : is a schematic diagram of the structure of the bending component provided in an embodiment of the present application. As an optional embodiment, the tab welding fixture 100 further includes two bending components 5, which are respectively arranged on both sides of the fixture body 1 along the third direction Z. The bending components 5 are configured to bend the tabs 801 of the same sex of the bare battery cell 800 so that the tabs 801 of the same sex of the two bare battery cells 800 abut against the top cover pins 901, wherein the third direction Z is a direction intersecting with both the first direction X and the second direction Y. In this way, the tabs 801 of the two bare battery cells 800 can be bent by the two bending components 5 to achieve the connection between the tabs 801 and the top cover pins 901.

[0087] Exemplarily, the third direction Z may be the length direction of the first substrate 11 .

[0088] Alternatively, as Figure 4 and Figure 5As shown, the bending component 5 includes a support frame 51, a bending drive member 52, a first sub-bending member 53 and a second sub-bending member 54. The support frame 51 is arranged on one side of the clamp body 1 along the third direction Z, and the bending drive member 52 is arranged on the support frame 51. The first sub-bending member 53 and the second sub-bending member 54 are both connected to the bending drive member 52, and the first sub-bending member 53 and the second sub-bending member 54 are arranged facing each other along the second direction Y. The bending drive member 52 is configured to drive the first sub-bending member 53 and the second sub-bending member 54 to approach each other along the second direction Y, so that the same-sex tabs 801 of the two bare battery cells 800 are bent toward the top cover pin 901 to abut against the top cover pin 901. In this way, the first sub-bending member 53 and the second sub-bending member 54 are adjusted to approach each other in the second direction Y by the bending drive member 52, so as to bend the same-sex pole ears 801 of the bare battery cell 800 toward each other, thereby bending the pole ears 801 toward the top cover pin 901, thereby realizing the connection between the same-sex pole ears 801 of the two bare battery cells 800 and the same top cover pin 901.

[0089] Optionally, the bending drive member 52 may be implemented in a variety of ways. For example, it may be driven by an electric cylinder. Alternatively, it may be driven by a pneumatic cylinder. Alternatively, it may be driven by a hydraulic cylinder. Alternatively, it may be driven by a stepper motor in conjunction with a gear or rack. Alternatively, it may be driven by an electric drive motor in conjunction with a gear or rack, etc. This embodiment is not limited to these aspects.

[0090] Optionally, the first sub-bending member 53 includes but is not limited to a plate shape or a comb shape. It is understandable that the second sub-bending member 54 also includes but is not limited to a plate shape or a comb shape.

[0091] Please combine Figure 6 , Figure 6 : It is a structural diagram of the tab welding fixture (excluding the second substrate) provided in an embodiment of the present application. As an optional embodiment, the tab welding fixture 100 also includes a tab pressing mechanism 6, and the tab pressing mechanism 6 includes two tab pressing members 61. The two tab pressing members 61 are sequentially arranged at both ends of the fixture body 1 along the third direction Z. The tab pressing members 61 are configured to move toward each other along the third direction Z so that the top cover pins 901 are pressed against the same-sex tabs 801 of the two bare cells 800. Since the tabs 801 need to be kept in close contact with the top cover pins 901 during welding to achieve a good welding effect, the two tab pressing members 61 on both sides of the fixture body 1 in the third direction Z move toward each other along the third direction Z, which can maintain the connection between the tab 801 and the top cover pins 901 after bending, and make the connection tight, which is beneficial to improving the welding quality of the tabs 801, and thus beneficial to improving the qualified rate of the product.

[0092] Optionally, the tab pressing member 61 includes a pressing plate, a pressing strip, a pressing block, etc., which is not limited in this embodiment. Figure 4 and Figure 6 As shown, the tab pressing member 61 is configured as a pressure plate. Specifically, the tab pressing member 61 is provided with an escape opening 611 extending along the third direction Z. The first sub-bending member 53 includes a first main body 531 and a plurality of first teeth 532 , which are sequentially arranged on the first main body 531 along the first direction X. The second sub-bending member 54 includes a second main body 541 and a plurality of second teeth 542 , which are sequentially arranged on the second main body 541 along the first direction X. The escape opening 611 is configured to allow each first tooth 532 and each second tooth 542 to partially extend therethrough to bend the tabs 801 of the same sex of the two bare battery cells 800 . By partially extending each first tooth portion 532 and each second tooth portion 542 into the avoidance opening 611 on the tab pressing member 61, the first tooth portion 532 and the second tooth portion 542 are respectively brought into contact with the tabs 801 of the same sex on the two bare cells 800, thereby enabling the first sub-bending member 53 and the second sub-bending member 54 to bend the tabs 801 of the same sex on the two bare cells 800 through the first tooth portion 532 and the second tooth portion 542, respectively. At the same time, this embodiment makes the overall structure of the tab welding fixture 100 more compact.

[0093] Alternatively, as Figure 4 and Figure 6 As shown, the avoidance opening 611 includes a first sub-avoidance opening 611a and two second sub-avoidance openings 611b. The first sub-avoidance opening 611a and the two second sub-avoidance openings 611b are sequentially spaced apart along the first direction X. The first sub-avoidance opening 611a is configured to provide a welding space for the like-sex tabs 801 of the two bare battery cells 800. The first sub-avoidance opening 611a provides a welding space for the welding head, allowing the welding head to extend into the first sub-avoidance opening 611a and abut against the tab 801, thereby improving the welding quality of the tab 801. In addition, the first sub-avoidance opening 611a and the two second sub-avoidance openings 611b are arranged in sequence along the first direction X, so that space can be provided for the first tooth portion 532 and the second tooth portion 542 to extend into to bend the pole ear 801, and the pole ear 801 can be pressed through the part between the first sub-avoidance opening 611a and the two second sub-avoidance openings 611b, so that the same-sex pole ears 801 of the two bare battery cells 800 maintain close contact with the top cover pin 901.

[0094] Optionally, the tab pressing members 61 may be configured to move toward each other along the third direction Z. There are many possible implementations. For example, one tab pressing assembly may be stationary, while the other tab pressing assembly approaches the stationary tab pressing assembly along the third direction Z. Alternatively, the two tab pressing assemblies may simultaneously move toward each other along the third direction Z, which is not limited in this embodiment.

[0095] It is understandable that the two tabs 801 pressing assemblies simultaneously move toward each other along the third direction Z. The two tabs 801 pressing assemblies can be driven by two driving components to move toward each other respectively; or the two tabs 801 pressing assemblies can be driven by the same driving component to move toward each other. This embodiment does not limit this. For example, Figure 6 As shown, the tab pressing mechanism 6 also includes a pressing drive 62 and a pressing transmission assembly 63. The pressing drive 62 is arranged at one end of the clamp body 1 along the third direction Z. The pressing transmission assembly 63 is connected to the pressing drive 62, and the two tab pressing members 61 are both connected to the pressing transmission assembly 63. The pressing drive 62 is configured to drive the two tab pressing members 61 to move synchronously toward each other along the third direction Z. With this embodiment, on the one hand, the tab pressing members 61 are driven by the pressing drive 62 and the pressing transmission assembly 63; on the other hand, the two tab pressing members 61 can synchronously press the tabs 801 on both sides of the two bare cells 800 through the synchronous movement of the two tab pressing members 61 along the third direction Z, thereby avoiding the situation in which the surface of the bare cells 800 is worn when a single tab pressing member 61 pushes the two bare cells 800 to press against the other tab pressing member 61.

[0096] Alternatively, the compression drive 62 and the compression transmission assembly 63 may be implemented in various ways. For example, the compression drive 62 may be configured as a motor, and the compression transmission assembly 63 may be configured as a synchronous belt. Alternatively, the compression drive 62 may be configured as a motor, and the compression transmission assembly 63 may be configured as a gear and a chain, etc., which are not limited in this embodiment.

[0097] For example, the compression drive member 62 is set as a motor, and the compression transmission assembly 63 is set as a synchronous belt. Figure 6As shown, the compression transmission assembly 63 is connected to the compression driving member 62, and the compression transmission assembly 63 includes a first pulley 631, a second pulley 632, a synchronous belt 633, a first slider 634 and a second slider 635. The first pulley 631 and the second pulley 632 are sequentially arranged at both ends of the clamp body 1 along the third direction Z. The first pulley 631 is connected to the compression driving member 62, and the synchronous belt 633 is sleeved on the first pulley 631 and the second pulley 632. The first slider 634 and the second slider 635 are arranged at both ends of the clamp body 1 along the third direction Z. The first slider 634 and the second slider 635 are connected to the synchronous belt 633 on opposite sides, and the first slider The block 634 and the second slider 635 are located between the first pulley 631 and the second pulley 632, and the first slider 634 and the second slider 635 are respectively connected to the two tab pressing members 61; the two ends of the clamp body 1 are respectively provided with a first guide rail 131 and a second guide rail 132 extending along the third direction Z, the first slider 634 is slidably connected to the first guide rail 131, and the second slider 635 is slidably connected to the second guide rail 132; the clamping drive 62 drives the first pulley 631 to rotate, driving the synchronous belt 633 and the second pulley 632 to rotate, so as to drive the first slider 634 and the second slider 635 to move toward or away from each other along the third direction Z.

[0098] The use of a transmission method in which the first slider 634 and the second slider 635 are connected to the synchronous belt 633 on opposite sides reduces the number of pressing drive members 62 provided, thereby reducing the manufacturing cost of the tab welding fixture 100. In addition, the first slider 634 and the second slider 635 respectively slide in cooperation with the first guide rail 131 and the second guide rail 132, making the movement of the tab pressing member 61 smoother and more stable. At the same time, the first guide rail 131 and the second guide rail 132 can guide the movement of the tab pressing member 61, thereby preventing the tab pressing member 61 from deviating from its movement trajectory.

[0099] Optionally, as can be seen from the foregoing, the clamp body 1 includes a first substrate 11, a second substrate 12 and a third substrate 13, the second substrate 12 is provided with a clamping avoidance opening 121 corresponding to the clamping member 23 along the first direction X, the two bending components 5 are respectively arranged on both sides of the first substrate 11 along the third direction Z, the pressing drive member 62 is arranged at one end of the third substrate 13 along the third direction Z, and the pressing drive member 62 is located between the first substrate 11 and the third substrate 13, the first guide rail 131 and the second guide rail 132 are extended along the third direction Z and provided on the third substrate 13. The first pulley 631 and the second pulley 632 are respectively arranged at both ends of the third base plate 13 corresponding to the first guide rail 131 and the second guide rail 132 along the third direction Z. The first pulley 631, the second pulley 632, the synchronous belt 633, the first slider 634, the second slider 635, the first guide rail 131 and the second guide rail 132 are all arranged in the installation space between the second base plate 12 and the third base plate 13. The two tab pressing members 61 are arranged above the third base plate 13, and the two tab pressing members 61 are sequentially arranged on both sides of the second base plate 12 along the third direction Z. Through this embodiment, the pressing transmission assembly 63 is arranged between the third base plate 13 and the second base plate 12, which is conducive to improving the compactness of the overall structure of the tab welding fixture 100, thereby facilitating the modularization and integration of the tab welding fixture 100.

[0100] In order to keep the top cover pin 901 from tilting when the tab 801 is welded, the pin support structure 7 can also provide support force for the top cover pin 901 to maintain the position of the top cover pin 901. Specifically, the tab welding fixture 100 also includes a pin support structure 7, which includes a support driver 71 and a pin support 72. The support driver 71 is provided on the fixture body 1, and the pin support 72 includes a connecting portion 721 and two supporting sub-portions 722. The connecting portion 721 is connected to the support driver 71, and the two supporting sub-portions 722 are spaced apart from the connecting portion 721. The two supporting sub-portions 722 are respectively provided corresponding to the two top cover pins 901 of the top cover assembly 900. The support driver 71 is configured to drive the connecting portion 721 to approach the two bare cells 800 along the first direction X, so that each supporting sub-portion 722 extends between the same-sex tabs 801 of the two bare cells 800 and abuts against the corresponding top cover pin 901.

[0101] The contact between the support sub-portions 722 on the pin support structure 7 and the corresponding top cover pins 901 can provide support force for the top cover pins 901, so that the top cover pins 901 maintain the required welding position, avoid the top cover pins 901 from being skewed, and help improve the welding quality between the tabs 801 and the top cover pins 901, thereby helping to improve the qualified rate of the product. In addition, the support driving member 71 can realize the driving of the two support sub-portions 722 so that the support sub-portions 722 can contact the top cover pins 901.

[0102] Optionally, the support drive member 71 may be implemented in a variety of ways. For example, it may be driven by a pneumatic cylinder. Alternatively, it may be driven by a motor and a rack and pinion. Alternatively, it may be driven by a motor and a ball screw. Alternatively, it may be driven by an electric cylinder, etc., which are not limited in this embodiment.

[0103] For example, Figure 6 As shown, the support drive member 71 is configured to be driven by an electric cylinder. The electric cylinder is positioned on the other side of the fixture body 1 along the first direction X, corresponding to the top cover assembly 900. The electric cylinder's driving end is connected to the connecting portion 721. The electric cylinder is configured to drive the connecting portion 721 toward the two bare cells 800 along the first direction X, so that each supporting sub-section 722 extends between the like-pole tabs 801 of the two bare cells 800 and abuts the corresponding top cover pin 901. Due to the high integration, high precision, and high repeatability of electric cylinders, the adoption of an electric cylinder drive approach, on the one hand, directly connects the electric cylinder's driving end to the connecting portion 721, thereby reducing the need for external components and simplifying system design and maintenance. On the other hand, the movement of the supporting sub-section 722 in the first direction X can be more precisely controlled, facilitating high-precision position control and repeatable positioning; and, furthermore, consistent precision and repeatability are provided for each movement of the supporting sub-section 722.

[0104] Optionally, the connecting portion 721 includes a connecting plate, a connecting beam, a connecting block, etc., which is not limited in this embodiment.

[0105] Alternatively, as Figure 6 As shown, the tab pressing member 61 is further provided with an avoidance groove 612 extending along the first direction X. The avoidance groove 612 is configured to allow each supporting sub-portion 722 to partially extend therein. The avoidance groove 612 can provide accommodation space for the supporting sub-portion 722, which is conducive to preventing the supporting sub-portion 722 from sliding when the tab pressing member 61 presses the tab, thereby preventing the supporting sub-portion 722 from disengaging from the top cover pin 901. This is conducive to ensuring that the supporting sub-portion 722 can provide support force for the top cover pin 901, preventing the top cover pin 901 from being skewed, and further facilitating the improvement of the welding quality between the tab 801 and the top cover pin 901, and improving the qualified rate of the product.

[0106] See also Figure 7 , Figure 7 is a schematic diagram of the structure of the welding equipment provided in an embodiment of the present application. Secondly, an embodiment of the present application further discloses a welding device 200, which includes the tab welding fixture 100 described in the first aspect. The welding device 200, including the tab welding fixture 100, can also achieve aligned connection between the top cover pins 901 and the like-sex tabs 801 of two bare battery cells 800, thereby improving the welding quality of the tabs 801 and the product qualification rate.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A tab welding fixture, characterized in that: include: A fixture body, the fixture body being configured to hold two bare cells arranged in opposite positions, with like-polarity tabs of the two bare cells facing each other; a clamping assembly, the clamping assembly being located on one side of the clamp body along the first direction, the clamping assembly being configured to clamp the top cover assembly; a first driving mechanism connected to the clamping assembly, the first driving mechanism being configured to drive the clamping assembly to move the top cover assembly in a second direction, so as to adjust a position of the top cover assembly relative to the two bare cells; as well as a second driving mechanism, the second driving mechanism being disposed on the fixture body and connected to the first driving mechanism, the second driving mechanism being configured to drive the first driving mechanism to move the top cover assembly along the first direction toward the fixture body, so that the top cover pins of the top cover assembly extend between the like-polarity tabs of the two bare cells; The first direction and the second direction intersect.

2. The tab welding fixture according to claim 1, characterized in that: The clamping assembly includes a fixing member, an adjusting member and a clamping member, the fixing member is connected to the first driving mechanism, the adjusting member is arranged on a side of the fixing member close to the clamp body, the clamping member is connected to the adjusting member, the clamping member has a clamping space for clamping the top cover assembly, and the adjusting member is configured to adjust the size of the clamping space formed by the clamping member.

3. The tab welding fixture according to claim 2, characterized in that: The adjusting member and the clamping member are both provided in pairs, the two adjusting members are provided on the fixing member at intervals along the third direction, and each clamping member is connected to a corresponding adjusting member; The third direction intersects with the first direction and the second direction.

4. The tab welding fixture according to claim 2, characterized in that: The clamping assembly further includes a buffer member, which is disposed on the clamping member and located in the clamping space. A positioning groove is provided on the buffer member, and the positioning groove is configured to clamp the top cover assembly.

5. The tab welding fixture according to claim 1, characterized in that: The tab welding fixture further includes two bending components, the two bending components are respectively arranged on both sides of the fixture body along the third direction, and the bending components are configured to bend the tabs of the same sex of the bare battery cell so that the tabs of the same sex of the two bare battery cells abut against the top cover pins; The third direction is a direction intersecting with both the first direction and the second direction.

6. The tab welding fixture according to claim 5, characterized in that: The bending component includes a support frame, a bending drive, a first sub-bending member and a second sub-bending member. The support frame is arranged on one side of the clamp body along the third direction, and the bending drive is arranged on the support frame. The first sub-bending member and the second sub-bending member are both connected to the bending drive, and the first sub-bending member and the second sub-bending member are arranged facing each other along the second direction. The bending drive is configured to drive the first sub-bending member and the second sub-bending member to approach each other along the second direction so that the like-sex tabs of the two bare cells are bent toward the top cover pins to abut against the top cover pins.

7. The tab welding fixture according to claim 6, characterized in that: The tab welding fixture also includes a tab pressing mechanism, which includes two tab pressing parts. The two tab pressing parts are sequentially arranged at both ends of the fixture body along the third direction, and the tab pressing parts are configured to move toward each other along the third direction so that the top cover pins are pressed against the same-sex tabs of the two bare battery cells.

8. The tab welding fixture according to claim 7, characterized in that: The tab pressing mechanism also includes a pressing drive and a pressing transmission assembly. The pressing drive is arranged at one end of the clamp body along the third direction. The pressing transmission assembly is connected to the pressing drive, and both tab pressing members are connected to the pressing transmission assembly. The pressing drive is configured to drive the two tab pressing members to move synchronously toward each other along the third direction.

9. The tab welding fixture according to claim 7, characterized in that: The tab pressing member is provided with an escape opening penetrating along the third direction; The first sub-bending member includes a first main body and a plurality of first teeth, wherein the plurality of first teeth are sequentially arranged on the first main body along the first direction; The second sub-bending member includes a second main body and a plurality of second teeth, and the plurality of second teeth are sequentially arranged on the second main body along the first direction; The avoidance opening is configured to allow a portion of the first tooth portion and a portion of the second tooth portion to extend therein to bend the same-sex tabs of the two bare battery cells.

10. The tab welding fixture according to claim 9, characterized in that: The avoidance opening includes a first sub-avoidance opening and two second sub-avoidance openings, and the first sub-avoidance opening and the two second sub-avoidance openings are arranged in sequence along the first direction. The first sub-avoidance opening is configured to provide a welding space for the same-pole tabs of the two bare battery cells, and for each first tooth portion and each second tooth portion to partially extend into to bend the same-pole tabs of the two bare battery cells. The second sub-avoidance opening is configured to allow each first tooth portion and each second tooth portion to partially extend into to bend the same-pole tabs of the two bare battery cells.

11. The tab welding fixture according to claim 1, characterized in that: The tab welding fixture further includes a pin support structure, the pin support structure includes a support driving member and a pin support member, and the support driving member is provided on the fixture body; The pin support member includes a connecting portion and two supporting sub-portions, the connecting portion is connected to the supporting driving member, the two supporting sub-portions are spaced apart from the connecting portion, and the two supporting sub-portions are respectively arranged corresponding to the two top cover pins of the top cover assembly; The support driving member is configured to drive the connecting portion to approach the two bare cells along the first direction, so that each supporting sub-portion extends between the same-sex tabs of the two bare cells and abuts against the corresponding top cover pin.

12. The tab welding fixture according to any one of claims 1 to 11, characterized in that: The clamp body includes a first substrate and a second substrate, the second substrate is arranged above the first substrate along the second direction, the second driving mechanism is arranged on the first substrate, and the second driving mechanism is located between the first substrate and the second substrate, and the second substrate is configured to place the two bare cells; The clamping assembly and the first driving mechanism are arranged on one side of the first substrate along the first direction.

13. The tab welding fixture according to any one of claims 1 to 11, characterized in that: The first driving mechanism drives the clamping assembly, and the clamping assembly drives the top cover assembly to approach the two bare cells along the second direction so that the height difference between the center of the top cover assembly and the center of the two bare cells along the second direction is less than or equal to 0.4 mm.

14. A welding device, characterized in that: It comprises the tab welding fixture according to any one of claims 1-13.

Images