Welding device for battery tabs

Abstract

The utility model discloses a welding device for a battery tab. The welding device comprises a bottom plate, a first supporting piece and a pressing piece, the bottom plate is provided with a first bearing part and a second bearing part, the first bearing part is used for bearing a first battery cell, and the second bearing part is used for bearing a second battery cell which is horizontally arranged with the first battery cell. The first supporting piece is arranged on the bottom plate and located between the first bearing part and the second bearing part, the first supporting piece is used for supporting to-be-welded tabs of the first battery cell and the second battery cell, a first avoiding groove is formed in the first supporting piece, and the first avoiding groove faces a welding seam of the tabs of the first battery cell and the second battery cell. The pressing piece is rotationally arranged on the bottom plate, the pressing piece can rotate in the direction close to the first supporting piece and press tabs of the first battery cell and the second battery cell on the first supporting piece, an operation cavity is formed in the pressing piece, and the operation cavity communicates with the first avoiding groove. The welding device can be used for directly welding the tabs of the battery cells, so that the cost of used materials is reduced, and the structural space of a whole pack of batteries is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of battery welding equipment, and in particular to a welding device for battery tabs. Background Technology

[0002] In related technologies, to improve the stability and quality of battery tab welding, transition materials are used for welding, such as aluminum busbars and adapter plates. Currently, common battery series welding uses 2mm thick busbars for transition welding to ensure the stability of the weld performance.

[0003] However, the busbar or connector material is 2mm thick, which increases the material cost. Furthermore, the series connection of the busbar reduces the structural space of the entire battery pack, reduces the battery capacity and energy performance, and limits the development and utilization space of the entire battery pack. Utility Model Content

[0004] The main objective of this invention is to provide a solution that addresses the technical problem of increasing material costs and limiting the structural space utilization of the entire battery pack when using busbars or connectors to weld battery tabs.

[0005] In order to achieve the above-mentioned utility model objectives, this utility model proposes a welding device for battery tabs.

[0006] A welding device for battery tabs, comprising:

[0007] The base plate is provided with a first support portion and a second support portion. The first support portion is used to support a first battery cell, and the second support portion is used to support a second battery cell that is horizontally arranged with the first battery cell.

[0008] A first support member is disposed on the base plate and located between the first bearing portion and the second bearing portion. The first support member supports the electrode tabs to be welded on the first battery cell and the second battery cell. A first clearance groove is provided on the first support member, and the first clearance groove faces the weld seam of the electrode tabs of the first battery cell and the second battery cell.

[0009] The pressing member is rotatably mounted on the base plate. The pressing member can rotate toward the first support member and press the tabs of the first and second battery cells on the first support member. The pressing member has an operating cavity that communicates with the first clearance groove.

[0010] In one embodiment, the welding device includes a first base and a second base disposed opposite to each other. The first base is disposed on one side of the base plate, and the second base is disposed on the other side of the base plate. The first end of the pressing member is rotatably disposed on the first base, and the second base has an installation groove, and the second end of the pressing member can be engaged in the installation groove.

[0011] In one embodiment, the outer side wall of the second base is provided with a first fastener, and the second end of the pressing member is provided with a second fastener. When the second end of the pressing member is engaged in the mounting groove, the first fastener and the second fastener are engaged and connected.

[0012] In one embodiment, the first clearance groove includes a first groove body and a second groove body, the first groove body and the second groove body being spaced apart along the length direction of the pressing member; and / or

[0013] The operating cavity includes a first cavity and a second cavity, which are spaced apart along the length of the pressing member.

[0014] In one embodiment, the radial dimension of the operating cavity gradually decreases along the direction close to the first support.

[0015] In one embodiment, a first clamping member is provided on one side of the first bearing portion, and a second clamping member is provided on the other side, wherein the first clamping member and the second clamping member jointly clamp the first battery cell; and / or

[0016] A third clamping member is provided on one side of the second bearing portion, and a fourth clamping member is provided on the other side. The third clamping member and the fourth clamping member together clamp the second battery cell.

[0017] In one embodiment, the welding device further includes a second support member for supporting the tabs of a third and fourth battery cell arranged vertically, wherein the tab of the third battery cell is Z-shaped, and the second support member is located at the bend of the tab of the third battery cell.

[0018] In one embodiment, the second support member has a second clearance groove, which faces the weld seam of the tabs of the third and fourth battery cells.

[0019] In one embodiment, the second clearance groove includes a third groove and a fourth groove, which are spaced apart along the length of the second support member.

[0020] In one embodiment, the second support member is provided with a hollowed-out portion.

[0021] Beneficial effects:

[0022] This utility model discloses a welding device for battery tabs. A first battery cell is placed on a first support portion, and a second battery cell is placed on a second support portion. The first and second battery cells are horizontally positioned. The tabs to be welded on the first and second battery cells are placed on a first support member. A driving pressing member rotates relative to the base plate, causing the pressing member to rotate towards the first support member and press the tabs of the first and second battery cells on the first support member. The pressing member presses firmly onto the tabs of the first and second battery cells. The first support member provides sufficient strength support for the tabs of the first and second battery cells, allowing the very thin tabs of the first and second battery cells to be stably welded by the welding equipment. The welding equipment passes through the operating chamber to weld the tabs of the first and second battery cells. During the welding process, a first clearance groove releases the energy and heat generated by the welding equipment, preventing energy and heat from accumulating below the weld seam of the tabs. This prevents heat from being unable to dissipate and avoids heat-induced erosion of the supporting material below, thus improving the welding quality. The welding device for the battery tabs can directly weld the tabs of the battery cells, ensuring welding stability and quality. Therefore, there is no need to weld the battery tabs using busbars or connector materials, thus reducing material costs and minimizing the overall structural space of the battery pack. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a welding device for battery tabs according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of a welding device for battery tabs according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of a pressing component according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the first and second battery cells according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the welding joint between the first and second battery cells according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of the third and fourth battery cells according to an embodiment of the present invention.

[0029] Figure 7 This is a structural schematic diagram of the third battery cell, the fourth battery cell, and the second support member according to an embodiment of the present invention.

[0030] Figure 8This is a schematic diagram of the structure of the second support member supporting the third and fourth battery cells according to an embodiment of the present invention.

[0031] in:

[0032] 100. Base plate; 110. First bearing part; 111. First clamping member; 112. Second clamping member; 120. Second bearing part; 121. Third clamping member; 122. Fourth clamping member; 130. First base; 140. Second base; 141. Mounting groove; 142. First fastener;

[0033] 200. First support member; 210. First clearance groove; 211. First groove body; 212. Second groove body;

[0034] 300, Pressing element; 310, Operating cavity; 311, First cavity; 312, Second cavity; 320, Second latching element;

[0035] 410, First cell; 420, Second cell; 430, Electrode weld; 450, Third cell; 451, Z-shaped electrode; 460, Fourth cell; 461, Electrode of the fourth cell;

[0036] 500, Second support member; 510, Second clearance groove; 511, Third groove; 512, Fourth groove; 520, Connecting part; 530, Hollowed-out part.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0039] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] like Figures 1 to 5As shown, in some embodiments, a battery tab welding apparatus includes a base plate 100, a first support member 200, and a pressing member 300. The base plate 100 is provided with a first bearing portion 110 and a second bearing portion 120. The first bearing portion 110 is used to support a first battery cell 410. The second bearing portion 120 is used to support a second battery cell 420 arranged horizontally with the first battery cell 410. The first support member 200 is disposed on the base plate 100 and located between the first bearing portion 110 and the second bearing portion 120. The first support member 200 is used to support the tabs to be welded on the first battery cell 410 and the second battery cell 420. A first clearance groove 210 is formed on the first support member 200. The first clearance groove 210 faces the tab weld seam 430 of the first battery cell 410 and the second battery cell 420. The pressing member 300 is rotatably disposed on the base plate 100. The pressing member 300 can rotate toward the first support member 200 and press the tabs of the first battery cell 410 and the second battery cell 420 on the first support member 200. The pressing member 300 has an operating cavity 310. The operating cavity 310 communicates with the first clearance groove 210.

[0043] During operation, the first battery cell 410 is placed on the first support portion 110. The second battery cell 420 is placed on the second support portion 120. The first battery cell 410 and the second battery cell 420 are horizontally arranged. The tabs to be welded on the first battery cell 410 and the second battery cell 420 are placed on the first support member 200. The driving pressing member 300 rotates relative to the base plate 100, causing the pressing member 300 to rotate towards the first support member 200 and press the tabs of the first battery cell 410 and the second battery cell 420 on the first support member 200. The pressing member 300 presses the tabs of the first battery cell 410 and the second battery cell 420 tightly. The first support member 200 provides sufficient strength support for the tabs of the first battery cell 410 and the second battery cell 420, so that the very thin tabs of the first battery cell 410 and the second battery cell 420 can be stably welded by the welding equipment. The welding equipment passes through the operating chamber 310 to weld the tabs of the first battery cell 410 and the second battery cell 420. During the welding process, the first clearance groove 210 releases the energy and heat generated by the welding equipment, preventing energy and heat from accumulating below the tab weld 430. This prevents heat from being trapped and causing erosion of the supporting material below, which could negatively impact the welding quality, thus improving the overall welding quality. This battery tab welding device can directly weld the tabs of the battery cells, ensuring welding stability and quality. Therefore, there is no need to weld the battery tabs using busbars or connector materials, thereby reducing material costs and minimizing the overall battery pack's structural space.

[0044] The tabs of the same flat-layer battery cell are connected in series, with an original tab thickness of <1mm. The overall overlap welding thickness of the tabs is <2mm. The laser welding of the 2mm base material has an adjustable power range of 200W. The gap between the upper and lower base materials is ≤0.02mm. A clamping force of 100-200N is used for welding. The pressing component 300 can accurately press the tabs of the first battery cell 410 and the second battery cell 420 onto the first support component 200, ensuring the positional accuracy of the tabs of the first battery cell 410 and the second battery cell 420 and the uniformity of welding pressure. This helps to improve the accuracy and quality of welding, making the weld more robust and uniform, and improving the overall quality of the welding.

[0045] It should be noted that the first cell 410 and the second cell 420 are arranged horizontally, that is, the cells of the same layer are welded together, and this welding can be performed outside the battery box. Then, the welded cells of the same layer are transported into the battery box.

[0046] In this embodiment, the welding method can be ultrasonic welding, pulse welding, resistance welding, or weld lap joint, etc.

[0047] Specifically, the base plate 100 can be a square plate. The tab weld 430 of the first battery cell 410 and the second battery cell 420 is located directly above the first clearance groove 210.

[0048] Specifically, the pressing member 300 can be a long, strip-shaped plate structure. The operating cavity 310 includes a first cavity 311 and a second cavity 312. The first cavity 311 and the second cavity 312 are spaced apart along the length of the pressing member 300. That is, the operating cavity 310 is divided into two cavities. By optimizing the welding space layout, facilitating observation and adjustment, and improving welding accuracy and stability, dividing the operating cavity 310 into two cavities can significantly improve welding quality.

[0049] Specifically, the radial dimension of the operating cavity 310 gradually decreases along the direction approaching the first support member 200. The radial dimension of the operating cavity 310 is larger away from the first support member 200 and smaller closer to the first support member 200. That is, the cavity wall of the operating cavity 310 is inclined. This arrangement can expand the operating space of the welding equipment when welding the electrode tabs, making it easier for the welding equipment to perform welding processing on the electrode tabs.

[0050] Specifically, the first support member 200 can be a long strip-shaped plate structure. The first clearance groove 210 includes a first groove 211 and a second groove 212. The first groove 211 and the second groove 212 are spaced apart along the length direction of the pressing member 300 to fit the first cavity 311 and the second cavity 312.

[0051] In some embodiments, the welding apparatus includes a first base 130 and a second base 140 disposed opposite to each other. The first base 130 is disposed on one side of the base plate 100. The second base 140 is disposed on the other side of the base plate 100. A first end of a pressing member 300 is rotatably disposed on the first base 130. The second base 140 has a mounting groove 141. A second end of the pressing member 300 can be engaged in the mounting groove 141.

[0052] It should be noted that the first base 130 provides a rotating connection point for the first end of the pressing member 300, allowing the first end of the pressing member 300 to rotate around this point, thereby enabling the pressing member 300 to move closer to or further away from the first support member 200. When it is necessary to press the tabs of the first battery cell 410 and the second battery cell 420, the pressing member 300 is driven to rotate towards the first support member 200, pressing the tabs of the first battery cell 410 and the second battery cell 420. When the second end of the pressing member 300 engages with the mounting groove 141, the tabs of the first battery cell 410 and the second battery cell 420 are fixed. After welding is completed, the pressing member 300 is driven to separate from the tabs of the first battery cell 410 and the second battery cell 420 and rotate away from the first support member 200.

[0053] In some embodiments, a first latching member 142 is provided on the outer side wall of the second base 140. A second latching member 320 is provided on the second end of the pressing member 300. When the second end of the pressing member 300 is engaged in the mounting groove 141, the first latching member 142 and the second latching member 320 are latched together.

[0054] It should be noted that when the second end of the pressing component 300 is engaged in the mounting groove 141, the first latching component 142 and the second latching component 320 are engaged, effectively fixing the pressing component 300 to the second base 140. This fixing method prevents the pressing component 300 from accidentally loosening or detaching during welding, ensuring that the tabs of the first battery cell 410 and the second battery cell 420 are always pressed, providing stable conditions for welding operations. The latching connection method is simple and quick to operate, enabling rapid fixing and release of the pressing component 300. The operator only needs to insert the second end of the pressing component 300 into the mounting groove 141, causing the first latching component 142 and the second latching component 320 to automatically engage to complete the fixing operation. When it is necessary to release the pressing component 300, the latching connection can also be released through a simple operation.

[0055] In some embodiments, a first clamping member 111 is provided on one side of the first support portion 110, and a second clamping member 112 is provided on the other side. The first clamping member 111 and the second clamping member 112 together clamp the first battery cell 410. The first clamping member 111 and the second clamping member 112 work together to tightly clamp the first battery cell 410 from both sides of the first support portion 110, ensuring that the first battery cell 410 will not move, shake, or misalign during the welding process.

[0056] In addition, the first clamping member 111 and the second clamping member 112 can also be used to position the first battery cell 410. The first battery cell 410 is placed between the first clamping member 111 and the second clamping member 112, and the position of the first battery cell 410 is precisely adjusted by adjusting the position of the first clamping member 111 and the second clamping member 112 to ensure that the tab of the first battery cell 410 is in the correct welding position.

[0057] Specifically, the first clamping member 111 and the second clamping member 112 are arranged along the length direction of the base plate 100.

[0058] Specifically, the first clamping member 111 and the second clamping member 112 can be clamping plates.

[0059] In some embodiments, a third clamping member 121 is provided on one side of the second support portion 120, and a fourth clamping member 122 is provided on the other side. The third clamping member 121 and the fourth clamping member 122 together clamp the second battery cell 420. The functions of the third clamping member 121 and the fourth clamping member 122 are the same as those of the first clamping member 111 and the second clamping member 112, and will not be described again here.

[0060] like Figures 6 to 8 As shown, in some embodiments, the welding apparatus further includes a second support member 500. The second support member 500 is used to support the tabs of the third cell 450 and the fourth cell 460 arranged vertically. The tab of the third cell 450 is Z-shaped. The second support member 500 is located at the bend of the tab of the third cell 450. After the welding of the tabs of the horizontally arranged first cell 410 and second cell 420 is completed, the welded first cell 410 and second cell 420 are transported into the battery box, where they are fixed. Then, the vertically oriented cell tabs are welded inside the battery box. That is, the second support member 500 supports the tabs of the third cell 450 and the fourth cell 460 located inside the battery box.

[0061] It should be noted that the third cell 450 can be a lower-layer cell, and the fourth cell 460 can be an upper-layer cell. After the tab of the third cell 450 is bent, the plane of the third cell 450 tab fits against the plane of the fourth cell tab 461. The plane of the bent height of the third cell 450 is supported by the second support member 500, flattening the welding surfaces of the upper and lower tabs. During welding, a welding equipment pressure block is used to press the upper and lower tabs together, and the weld seam is located directly above the second support member 500. The welding parameters are consistent with the parameters for the same layer. The second support member 500 can be assembled into the battery box. The support block is located below the Z-shaped tab 451, without occupying space outside the battery box, effectively saving design space.

[0062] Specifically, a second clearance groove 510 is provided on the second support member 500. The second clearance groove 510 faces the weld seam of the tabs of the third battery cell 450 and the fourth battery cell 460. The second clearance groove 510 releases the energy and heat generated by the welding equipment, preventing energy and heat from accumulating below the weld seam of the tabs, and preventing adverse effects on the welding quality due to heat not being able to dissipate and the support material below being eroded by heat, thereby improving the welding quality.

[0063] Specifically, the first support member 200 has connecting portions 520 at both ends. The connecting portions 520 are used to connect to the inner sidewall of the battery box so that the first support member 200 is fixed to the inner sidewall of the battery box.

[0064] Specifically, the first support member 200 can be made of plastic, which can reduce the weight of the first support member 200 and provide electrical insulation for the electrode tab.

[0065] Specifically, the second support member 500 is provided with a hollowed-out portion 530, which can reduce the weight of the first support member 200 and reduce material costs.

[0066] Specifically, the second support member 500 can be a block structure. The thickness of the second support member 500 is consistent with the width of the Z-shaped bend welding plane. The length of the second support member 500 is equal to or less than the width of the tab 461 of the third cell 450 or the fourth cell. The height of the second support member 500 is equal to the height of the Z-shaped bend tab.

[0067] Specifically, the second clearance groove 510 includes a third groove 511 and a fourth groove 512. The third groove 511 and the fourth groove 512 are spaced apart along the length of the second support member 500.

[0068] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A welding device for battery tabs, characterized in that, include: The base plate is provided with a first support portion and a second support portion. The first support portion is used to support a first battery cell, and the second support portion is used to support a second battery cell that is horizontally arranged with the first battery cell. A first support member is disposed on the base plate and located between the first bearing portion and the second bearing portion. The first support member is used to support the electrode tabs of the first battery cell and the second battery cell to be welded. A first clearance groove is provided on the first support member, and the first clearance groove faces the weld seam of the electrode tabs of the first battery cell and the second battery cell. and The pressing member is rotatably mounted on the base plate. The pressing member can rotate toward the first support member and press the tabs of the first and second battery cells on the first support member. The pressing member has an operating cavity that communicates with the first clearance groove.

2. The welding apparatus according to claim 1, characterized in that, The welding device includes a first base and a second base arranged opposite to each other. The first base is located on one side of the base plate, and the second base is located on the other side of the base plate. The first end of the pressing member is rotatably mounted on the first base, and the second base has an installation groove, into which the second end of the pressing member can be engaged.

3. The welding apparatus according to claim 2, characterized in that, The outer side wall of the second base is provided with a first fastener, and the second end of the pressing member is provided with a second fastener. When the second end of the pressing member is engaged in the mounting groove, the first fastener and the second fastener are engaged and connected.

4. The welding apparatus according to claim 1, characterized in that, The first clearance groove includes a first groove body and a second groove body, the first groove body and the second groove body being spaced apart along the length direction of the pressing member; and / or The operating cavity includes a first cavity and a second cavity, which are spaced apart along the length of the pressing member.

5. The welding apparatus according to claim 1, characterized in that, The radial dimension of the operating cavity gradually decreases along the direction close to the first support member.

6. The welding apparatus according to claim 1, characterized in that, A first clamping member is provided on one side of the first bearing portion, and a second clamping member is provided on the other side. The first clamping member and the second clamping member together clamp the first battery cell; and / or A third clamping member is provided on one side of the second bearing portion, and a fourth clamping member is provided on the other side. The third clamping member and the fourth clamping member together clamp the second battery cell.

7. The welding apparatus according to claim 1, characterized in that, The welding device further includes a second support member, which is used to support the tabs of the third and fourth battery cells arranged in a vertical direction. The second support member is located at the bend of the tab of the third battery cell.

8. The welding apparatus according to claim 7, characterized in that, The second support member has a second clearance groove, which faces the weld seam of the tabs of the third and fourth battery cells.

9. The welding apparatus according to claim 8, characterized in that, The second clearance groove includes a third groove and a fourth groove, which are spaced apart along the length of the second support member.

10. The welding apparatus according to claim 7, characterized in that, The second support member has a hollowed-out section.

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