Double-sided welding device for multi-layer tabs of battery

Abstract

The utility model discloses a battery multilayer tab double-sided welding device, which comprises a first welding machine and a second welding machine, the first welding machine comprises a first welding head and a first driving piece, the second welding machine comprises a second welding head and a second driving piece, and the first welding head and the second welding head are oppositely arranged. The first driving piece and the second driving piece synchronously drive the first welding head and the second welding head to move oppositely, and the first welding head and the second welding head are used for welding the two opposite faces of the battery cell tab correspondingly. According to the utility model, the two welding machines are arranged, the two welding machines are provided with the welding heads and the driving pieces which correspond to each other, the battery cell tabs are arranged between the first welding machine and the second welding machine, and the two driving pieces synchronously drive the corresponding welding heads to move oppositely through the collaborative operation of the first welding machine and the second welding machine; the two sides of the battery cell tabs can be welded at the same time, the method can be better suitable for welding the tabs with large thickness and connecting pieces after multiple layers of tabs are stacked, and pseudo soldering of the multiple layers of tabs and the connecting pieces is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing, in particular to a double-sided welding device for multi-layer tabs of a battery. Background Art

[0002] The assembly of battery cells primarily involves the preparation of positive and negative electrode sheets, as well as the initial formation of the cell, primarily involving winding and lamination processes. The lamination process involves cutting the positive and negative electrode sheets to the required size, then stacking the positive, separator, and negative electrode sheets to form a cell stack. Multiple cell stacks are then stacked and connected in parallel to form a cell stack. Finally, the cells are packaged using hot pressing and ultrasonic welding, and then injected with liquid to form an unactivated single cell.

[0003] In the existing technology, the market needs batteries with larger capacity and lower prices. Therefore, single battery cells are getting thicker and the number of layers in the battery cell stacking structure is increasing. During ultrasonic welding packaging, it is necessary to weld the multi-layer positive electrode tabs, multi-layer negative electrode tabs and connectors separately, which can easily lead to cold solder joints.

[0004] To this end, the present application aims to propose a double-sided welding device for multi-layer battery tabs, aiming to solve the above-mentioned problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a double-sided welding device for multi-layer battery tabs, aiming to solve the technical problem in the prior art that the thickness of the multi-layer tabs after stacking is too large, which easily leads to cold welding when ultrasonically welding with connecting parts.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model proposes a double-sided welding device for multi-layer tabs of a battery, comprising a first welding machine and a second welding machine, wherein the first welding machine comprises a first welding head and a first driving member, and the second welding machine comprises a second welding head and a second driving member, the first welding head and the second welding head are arranged opposite to each other, and the first driving member and the second driving member drive the first welding head and the second welding head to move toward each other, and the first welding head and the second welding head are respectively used for welding the opposite sides of the battery cell tabs.

[0007] Furthermore, it also includes a supporting mechanism, one end of which is provided with a clamping member, the clamping member is provided between the first welding head and the second welding head, and the clamping member is used to clamp the battery core stacking structure.

[0008] Furthermore, the first welding head and the second welding head are each provided with at least one welding surface.

[0009] Furthermore, the first welding head and the second welding head are both provided with a plurality of welding surfaces, and the plurality of welding surfaces are both arranged in a ring shape on the first welding head and the second welding head.

[0010] Furthermore, the roughness of the plurality of welding surfaces is different.

[0011] Furthermore, the first welding machine and the second welding machine each include a third driving member for driving the first welding head and the second welding head to rotate.

[0012] Furthermore, the first welding machine and the second welding machine are both provided with avoidance holes, the main bodies of the first welding head and the second welding head are respectively arranged in the avoidance holes of the first welding machine and the second welding machine, and the first driving member and the second driving member are respectively located in the avoidance holes and connected to the main bodies of the first welding head and the second welding head.

[0013] Furthermore, the support mechanism further includes an adjusting member, which is rotatably connected to the clamping member and is used to adjust the position of the clamping member.

[0014] Furthermore, it is characterized in that it also includes a base, the first welding machine and the second welding machine are respectively arranged at two ends of the base, and the supporting mechanism is arranged between the first welding machine and the second welding machine.

[0015] Furthermore, a first base and a second base are provided on the base, and the first welding machine and the second welding machine are fixedly provided on the first base and the second base, respectively.

[0016] Beneficial effects:

[0017] Compared with the prior art, the embodiment of the present application is a double-sided welding device for multi-layered battery tabs, comprising a first welding machine and a second welding machine, wherein the first welding machine comprises a first welding head and a first driving member, and the second welding machine comprises a second welding head and a second driving member, wherein the first welding head and the second welding head are arranged relative to each other, and the first driving member and the second driving member synchronously drive the first welding head and the second welding head to move toward each other, and the first welding head and the second welding head are respectively used for welding the opposite sides of the battery cell tab. This technical solution sets a first welding machine and a second welding machine on the welding device, both of which are provided with corresponding welding heads and driving members, and sets the welding heads of the two relative to each other. During the welding process of the battery cell tab, the battery cell tab is set between the first welding machine and the second welding machine. Through the coordinated operation of the first welding machine and the second welding machine, the two driving members operate synchronously, driving the corresponding welding heads to move toward each other, so that both sides of the battery cell tab can be welded simultaneously, which can be better suitable for welding the thicker tabs and connectors after the multi-layer tabs are stacked, avoiding the occurrence of cold solder joints between the multi-layer tabs and the connectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a battery multi-layer tab double-sided welding device according to an embodiment of the present invention;

[0019] Figure 2 This is a front view of a double-sided welding device for multi-layered tabs of a battery according to an embodiment of the present invention;

[0020] Figure 3 This is a three-dimensional schematic diagram of a battery cell stacking structure according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of a connecting piece according to an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of a first welding head according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the three-dimensional structure of the second welding head according to an embodiment of the present invention.

[0024] in:

[0025] 1. Welding device; 10. First welding machine; 100. First driving member; 101. First welding head; 1010. Welding surface; 102. Avoidance hole; 11. Second welding machine; 110. Second driving member; 111. Second welding head; 12. Support mechanism; 120. Clamping member; 121. Adjusting member; 13. Base; 130. First base; 131. Second base; 2. Battery cell stacking structure; 20. Battery cell tab; 21. Top tab; 22. Bottom tab; 3. Connector; 30. Clamping section; 31. Connecting section.

[0026] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] The assembly of battery cells primarily involves the preparation of positive and negative electrode sheets, as well as the initial formation of the cell, primarily involving winding and lamination processes. The lamination process involves cutting the positive and negative electrode sheets to the required size, then stacking the positive, separator, and negative electrode sheets to form a cell stack. Multiple cell stacks are then stacked and connected in parallel to form a cell stack. Finally, the cells are packaged using hot pressing and ultrasonic welding, and then injected with liquid to form an unactivated single cell.

[0032] With the development of battery technology, the market demands larger and more affordable batteries. To increase the capacity of individual cells, individual cells are becoming thicker and the number of layers in the cell stack is increasing. This, in turn, leads to an increasing number of tabs. The tabs and connectors are usually connected together through ultrasonic welding.

[0033] The inventors discovered that when ultrasonically welding multi-layer positive electrode tabs, multi-layer negative electrode tabs, and connectors, single-sided welding is usually used. However, the technical solution of single-sided welding can only achieve stable welding when the number of layers is relatively small. When the thickness of the tabs increases, the pressure is usually increased when welding the battery cell tabs and connectors. However, increasing the pressure can easily lead to problems such as tearing of the material and deformation of the connectors. At the same time, once the number of tab layers is too large, for example, when the number of tab layers increases from 60 to 100, the high-frequency vibration waves of the ultrasonic welding machine cannot be transmitted to the required metal surface, and the problem of cold welding is likely to occur.

[0034] In order to solve the above-mentioned technical problem that the thickness of the multi-layer tabs after stacking is too large, which easily leads to cold solder joints during ultrasonic welding with connecting parts, the inventors proposed a double-sided welding device for multi-layer tabs of batteries. The double-sided welding device for multi-layer tabs of batteries in the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0035] See also Figure 3 and Figure 4 , Figure 3 This is a three-dimensional schematic diagram of a battery cell stacking structure according to an embodiment of the present invention; Figure 4This is a schematic diagram of a connector of an embodiment of the present invention. Specifically, the connector in this application is a double-sided conductive handle. The tab is the part of the battery cell that is responsible for conducting or importing current, and the double-sided conductive handle is usually made of a material with high conductivity. Welding the tab to the double-sided conductive handle can establish an efficient conductive path to ensure that the current is evenly distributed under high current conditions and avoid damage to the battery cell due to local overheating. Exemplarily, the welding device 1 of the present application is applied to the assembly of battery cells, specifically to the welding of the battery cell tab 20 and the connector 3 in the battery cell stacking structure 2. The battery cell stacking structure 2 is formed by stacking a plurality of battery cell laminate structures, and the battery cell laminate structure is formed by stacking a positive electrode sheet, a diaphragm and a negative electrode sheet. One end of the connector 3 includes a clamping section 30 that fits the battery cell stacking structure 2, and the other end is a connecting section 31 for connecting to other mechanisms such as electrode terminals or connection points on a circuit board. It can be understood that the welding device 1 of the present application is an ultrasonic welding device. There are multiple layers of battery cell tabs 20 in the battery cell stacking structure 2. In a specific embodiment, the clamping section 30 clamps the battery cell tab 20, and the clamping section 30 is in contact with the two opposite sides of the battery cell tab 20. The welding device 1 is used to weld the clamping section 30 to the two opposite sides of the battery cell tab 20, that is, the multiple layers of battery cell tabs 20 are clamped between the upper and lower clamping sections 30, and the welding device 1 is used to weld the clamping section 30 to the multiple layers of battery cell tabs 20.

[0036] See also Figures 1 to 4 , Figure 1 This is a schematic diagram of the three-dimensional structure of a battery multi-layer tab double-sided welding device according to an embodiment of the present invention; Figure 2 This is a front view of a double-sided welding device for a multi-layer battery tab according to one embodiment of the present invention. In this embodiment, a double-sided welding device 1 for a multi-layer battery tab is provided, comprising a first welding machine 10 and a second welding machine 11. The first welding machine 10 comprises a first welding head 101 and a first driving member 100, and the second welding machine 11 comprises a second welding head 111 and a second driving member 110. The first welding head 101 and the second welding head 111 are disposed opposite each other, and the first and second driving members 100 and 110 synchronously drive the first and second welding heads 101 and 111 to move toward each other. The first and second welding heads 101 and 111 are respectively used to weld opposite sides of a battery cell tab 20 to the clamping section 30 of a connector 3.

[0037] In this embodiment, the first welding machine 10 and the second welding machine 11 work together to weld the two opposite sides of the multi-layer battery cell tab 20 to the clamping section 30 of the connector 3. Specifically, when the first welding machine 10 is used to weld the top layer of the multi-layer battery cell tab 20 to the clamping section 30 of the connector 3, the second welding machine 11 is used to weld the bottom layer of the multi-layer battery cell tab 20 to the clamping section 30 of the connector 3; conversely, when the second welding machine 11 is used to weld the top layer of the multi-layer battery cell tab 20 to the clamping section 30 of the connector 3, the first welding machine 10 is used to weld the bottom layer of the multi-layer battery cell tab 20 to the clamping section 30 of the connector 3. Specifically, the first welding head 101 and the second welding head 111 are both used to weld the opposite sides of the multi-layer battery cell tab 20 and the clamping section 30 of the connector 3. The first driving member 100 is used to drive the first welding head 101 to move toward the second welding head 111, and the second driving member 110 is used to drive the second welding head 111 to move toward the first welding head 101. The first welding head 101 and the second welding head 111 are relatively arranged to place the battery cell tab 20 and the connector 3 between the first welding head 101 and the second welding head 111, so that the first welding head 101 and the second welding head 111 can weld the battery cell tab 20 from both sides of the battery cell tab 20 at the same time.

[0038] In the above embodiment, the present application sets a first welding machine 10 and a second welding machine 11 on the welding device 1, both of which are provided with corresponding welding heads and driving parts, and the welding heads of the two are arranged relative to each other. During the welding process of the battery cell tab 20, the battery cell tab 20 is arranged between the first welding machine 10 and the second welding machine 11, and the connecting member 3 is clamped on the battery cell tab 20 through the clamping section 30. Through the coordinated operation of the first welding machine 10 and the second welding machine 11, the two driving parts operate synchronously to drive the corresponding welding heads toward each other, and can simultaneously weld the two relative surfaces of the battery cell tab 20 in contact with the clamping section 30, which can be better suitable for welding the tabs with larger thickness after multi-layer tabs are stacked and the connecting member 3, thereby avoiding the occurrence of cold solder joints between the multi-layer tabs and the connecting member 3.

[0039] It is understandable that during welding, not only the connector 3 is connected to the top tab 21 or the bottom tab 22 in the multi-layer battery cell tab 20, but the single tabs in the multi-layer tab are also welded together to avoid cold welding. When single-sided welding is used, stable welding can only be achieved when the number of layers is relatively small. When the tab thickness is increased, the problem of cold welding is prone to occur. The present application adopts simultaneous welding on both sides to avoid cold welding after the tab thickness is increased.

[0040] It should be noted that the present application does not impose any specific restrictions on the relative positional relationship between the first welding machine 10 and the second welding machine 11. They can be arranged relative to each other or adjacent to each other, as long as the first welding head 101 and the second welding head 111 can perform double-sided welding at the same time. Furthermore, the present application does not impose any specific restrictions on the relative arrangement of the first welding head 101 and the second welding head 111. They can be adjusted accordingly based on the arrangement of the battery cell tab 20. For example, when the welding surface of the battery cell tab 20 is arranged horizontally, the first welding head 101 and the second welding head 111 are respectively located above and below the battery cell tab 20; when the welding surface of the battery cell tab 20 is arranged vertically, the first welding head 101 and the second welding head 111 are respectively located on the left and right of the battery cell tab 20.

[0041] See also Figures 1 to 4 In one embodiment, the welding device 1 further includes a supporting mechanism 12 , a clamping member 120 is provided at one end of the supporting mechanism 12 , the clamping member 120 is provided between the first welding head 101 and the second welding head 111 , and the clamping member 120 is used to clamp the battery cell stacking structure 2 .

[0042] In this embodiment, the support mechanism 12 is used to support the cell stack structure 2 and the clamping member 120, and can be used to position the cell stack structure 2 between the first welding head 101 and the second welding head 111. The clamping member 120 is used to place and secure the cell stack structure 2, and can place the portion of the cell tab 20 that is connected to the connector 3 in a suspended state, facilitating welding between the connector 3 and the cell tab 20.

[0043] In the above embodiment, the present application provides a support mechanism 12 for supporting the battery cell stack structure 2 , so as to facilitate disposing the battery cell tab 20 between the first welding head 101 and the second welding head 111 .

[0044] See also Figures 1 to 4 In one embodiment, each of the first welding head 101 and the second welding head 111 is provided with at least one welding surface 1010 .

[0045] In this embodiment, the welding surface 1010 is the portion that is in direct contact with the battery cell tab 20 during the welding process. By heating and applying pressure, a metallurgical bond is formed between the welding surface 1010 and the battery cell tab 20, thereby achieving electrical connection and mechanical fixation.

[0046] In the above embodiment, in the battery multi-layer tab double-sided welding device 1, the first welding head 101 and the second welding head 111 are both provided with welding surfaces 1010, and these welding surfaces 1010 can be arranged relative to each other and move synchronously, thereby achieving simultaneous double-sided welding of the battery cell tab 20. This is not only suitable for welding multi-layer tabs of increasing thickness, but also improves welding efficiency compared to single-sided welding, shortens production cycle, and reduces production costs.

[0047] See also Figures 1 to 6 In one embodiment, the first welding head 101 and the second welding head 111 are each provided with a plurality of welding surfaces 1010, and the plurality of welding surfaces 1010 are both arranged in an annular shape on the first welding head 101 and the second welding head 111. The plurality of welding surfaces 1010 have different roughness.

[0048] In this embodiment, the design of multiple welding surfaces 1010 allows the welding head to be flexibly adjusted to the different shapes, sizes, and welding requirements of the battery cell tabs 20. By varying the number, spacing, and angles of the welding surfaces 1010, efficient welding of complex battery cell tabs 20 can be achieved. Furthermore, multiple welding surfaces 1010 provide additional redundancy for the welding process. Even if one welding surface 1010 fails or wears out, the other welding surfaces 1010 can continue to function, ensuring continuity and stability of the welding operation and facilitating equipment maintenance.

[0049] In the above embodiment, the roughness of the welding surface 1010 is different, which helps to achieve close contact between the welding materials, increases the effective contact area of ​​the welding joint, and thus improves the welding strength.

[0050] It should be noted that a welding surface with excessive roughness is more likely to generate stress concentration, thereby increasing the risk of welding cracks. Appropriate roughness helps to disperse stress and reduce the occurrence of cracks. Therefore, providing multiple welding surfaces 1010 with different roughness can adapt to the welding of connectors 3 made of various materials.

[0051] See also Figures 1 to 4 In one embodiment, the first welding machine 10 and the second welding machine 11 also include a third driving member for driving the first welding head 101 and the second welding head 111 to rotate.

[0052] In this embodiment, the third drive element enables the welding head to actively rotate, thereby achieving multi-point, continuous welding of the battery cell tabs 20. This dynamic welding method can significantly improve welding efficiency compared to static welding, especially when processing large-area or multi-layer tabs. Furthermore, different battery cell tabs 20 may have different shapes, sizes, and welding requirements. By adjusting the speed, direction, and position of the third drive element, these complex requirements can be flexibly adapted to achieve precise and efficient welding.

[0053] See also Figures 1 to 4 In one embodiment, the first welding machine 10 and the second welding machine 11 are both provided with an avoidance hole 102, and the main bodies of the first welding head 101 and the second welding head 111 are respectively arranged in the avoidance holes 102 of the first welding machine 10 and the second welding machine 11, and the first driving member 100 and the second driving member 110 are respectively located in the avoidance holes 102 and connected to the main bodies of the first welding head 101 and the second welding head 111.

[0054] In this embodiment, the avoidance hole 102 is used to cooperate with the driver to adjust the position of the first welding head 101 and the second welding head 111. Due to the presence of the avoidance hole 102, the first and second driver members 100 and 110 can be more conveniently connected to the main bodies of the first and second welding heads 101 and 111. This connection method not only simplifies the installation process but also ensures the stability and precision between the driver and the welding head. During the welding process, the driver can accurately transmit power, driving the welding head to move along the trajectory and speed of the avoidance hole 102, thereby ensuring the accuracy and reliability of the welding.

[0055] See also Figures 1 to 4 In one embodiment, the support mechanism 12 further includes an adjusting member 121 , which is rotatably connected to the clamping member 120 , and is used to adjust the position of the clamping member 120 .

[0056] In this embodiment, the adjusting member 121 is used to adjust the height of the clamping member 120 and the direction of rotating the clamping member 120 .

[0057] In the above embodiment, the adjusting member 121 can adjust the height of the clamping member 120 according to the positions of the first welding head 101 and the second welding head 111, so as to facilitate the installation of the battery cell stacking structure 2 to adapt to the welding of the first welding head 101 and the second welding head 111. It can be understood that the positive electrode tab and the negative electrode tab in the battery cell stacking structure 2 can be located on the same side or on opposite sides. Therefore, the rotating connection between the adjusting member 121 and the clamping member 120 is conducive to adapting to different battery cell stacking structures 2. For example, when the positive electrode tab and the negative electrode tab are respectively provided on opposite sides of the battery cell stacking structure 2, after the welding of the battery cell tab 20 and the connector 3 on one side is completed, the clamping member 120 rotates to complete the welding of the battery cell tab 20 and the connector 3 on the other side.

[0058] See also Figures 1 to 4 In one embodiment, the welding device 1 further includes a base 13 , the first welding machine 10 and the second welding machine 11 are respectively arranged at two ends of the base 13 , and the supporting mechanism 12 is arranged between the first welding machine 10 and the second welding machine 11 .

[0059] In this embodiment, the base 13 is used to install the first welding machine 10, the second welding machine 11 and the support mechanism 12, and is used to support the weight of the entire device, ensuring that the welding machine, the support mechanism 12 and other related components will not shake or displace during operation, thereby ensuring the accuracy and stability of welding.

[0060] In the above embodiment, the welding machines are respectively arranged at both ends of the base 13, so that maintenance personnel can more conveniently access each welding machine for daily maintenance and troubleshooting. The support mechanism 12 includes adjustment members 121, which are rotatably connected to the clamping member 120, so that the position of the clamping member 120 can be adjusted as needed. Being arranged between the first welding machine 10 and the second welding machine 11, the welding device 1 can flexibly cope with battery cell tabs 20 of different shapes, sizes, and positions, thereby improving the adaptability and flexibility of welding.

[0061] See also Figures 1 to 4 In one embodiment, a first base 130 and a second base 131 are further provided on the base 13. The first base 130 and the second base 131 have different heights. The first welding machine 10 and the second welding machine 11 are fixedly provided on the first base 130 and the second base 131 respectively.

[0062] In this embodiment, the base is used to install and fix the first welding machine 10 and the second welding machine 11 .

[0063] In the above embodiment, by setting the first base 130 and the second base 131 at different heights, it can be ensured that even if the first welding machine 10 and the second welding machine 11 are exactly the same, the welding heads can be at different heights, thereby achieving the purpose of relative setting of the welding heads in the height direction, and the clamping member 120 in the support mechanism 12 can be adjusted to a height between the first welding head 101 and the second welding head 111 through the adjusting member 121, so as to achieve the purpose of simultaneously welding both sides of the tab.

[0064] The process of welding the multi-layer tabs and the connector 3 by the battery multi-layer tab double-sided welding device 1 is as follows:

[0065] In this application, a cell stacking structure 2 in which cell tabs 20 are provided at both ends or both sides is taken as an example. Before welding, the cell stacking structure 2 is clamped on the clamping member 120, and the adjusting member 121 is adjusted so that the cell tab 20 at one end is between the first welding head 101 and the second welding head 111, and the connecting member 3 is pre-fixed on the cell tabs 20 at both ends; then the first driving member 100 and the second driving member 110 synchronously drive the welding surfaces 1010 of the first welding head 101 and the second welding head 111 respectively to clamp the two sides of the connecting member 3, and perform welding; after welding is completed, the clamping member 120 rotates to rotate the cell tab 20 and the connecting member 3 at the other end between the first welding head 101 and the second welding head 111, and then the first driving member 100 and the second driving member synchronously drive the welding surfaces 1010 of the first welding head 101 and the second welding head 111 respectively to clamp the two sides of the connecting member 3, and perform welding, thereby completing the welding of the cell tab 20 and the connecting member 3.

[0066] In summary, a double-sided welding device 1 for a multi-layered battery tab according to an embodiment of the present application includes a first welding machine 10 and a second welding machine 11. The first welding machine 10 includes a first welding head 101 and a first driving member 100. The second welding machine 11 includes a second welding head 111 and a second driving member. The first welding head 101 and the second welding head 111 are arranged relative to each other. The first driving member 100 and the second driving member synchronously drive the first welding head 101 and the second welding head 111 to move toward each other. The first welding head 101 and the second welding head 111 are respectively used for welding the opposite sides of the battery cell tab 20. This technical solution sets a first welding machine 10 and a second welding machine 11 on the welding device 1, and both are provided with corresponding welding heads and driving parts. The welding heads of the two are arranged relative to each other. During the welding process of the battery cell tab 20, the battery cell tab 20 is arranged between the first welding machine 10 and the second welding machine 11. Through the coordinated operation of the first welding machine 10 and the second welding machine 11, the two driving parts operate synchronously to drive the corresponding welding heads to move towards each other, so that both sides of the battery cell tab 20 can be welded at the same time, which can be better suitable for welding the tab with a larger thickness after stacking multiple layers of tabs and the connector 3, thereby avoiding the occurrence of cold solder joints between the multiple layers of tabs and the connector 3.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery multi-layer tab double-sided welding device, characterized in that: include: The first welding machine and the second welding machine, the first welding machine includes a first welding head and a first driving member, the second welding machine includes a second welding head and a second driving member, the first welding head and the second welding head are arranged opposite to each other, the first driving member and the second driving member drive the first welding head and the second welding head to move toward each other, the first welding head and the second welding head are respectively used for welding the opposite sides of the battery cell tabs.

2. The battery multi-layer tab double-sided welding device according to claim 1, characterized in that: It also includes a supporting mechanism, one end of which is provided with a clamping member, the clamping member is arranged between the first welding head and the second welding head, and the clamping member is used to clamp the battery core stacking structure.

3. The battery multi-layer tab double-sided welding device according to claim 1, characterized in that: The first welding head and the second welding head are both provided with at least one welding surface.

4. The battery multi-layer tab double-sided welding device according to claim 3, characterized in that: The first welding head and the second welding head are both provided with a plurality of welding surfaces, and the plurality of welding surfaces are both arranged in a ring shape on the first welding head and the second welding head.

5. The battery multi-layer tab double-sided welding device according to claim 4, characterized in that: The roughness of multiple weld surfaces is different.

6. The battery multi-layer tab double-sided welding device according to claim 4, characterized in that: The first welding machine and the second welding machine also include a third driving member for driving the first welding head and the second welding head to rotate.

7. The battery multi-layer tab double-sided welding device according to claim 1, characterized in that: The first welding machine and the second welding machine are both provided with avoidance holes, and the main bodies of the first welding head and the second welding head are respectively arranged in the avoidance holes of the first welding machine and the second welding machine, and the first driving member and the second driving member are respectively located in the avoidance holes and connected with the main bodies of the first welding head and the second welding head.

8. The battery multi-layer tab double-sided welding device according to claim 2, characterized in that: The supporting mechanism further comprises an adjusting member, which is rotatably connected to the clamping member and is used to adjust the position of the clamping member.

9. The battery multi-layer tab double-sided welding device according to claim 2, characterized in that: It also includes a base, the first welding machine and the second welding machine are respectively arranged at two ends of the base, and the supporting mechanism is arranged between the first welding machine and the second welding machine.

10. The battery multi-layer tab double-sided welding device according to claim 9, characterized in that: A first base and a second base are also provided on the base, and the first welding machine and the second welding machine are fixedly provided on the first base and the second base respectively.

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