Tab welding supporting device and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a tab welding support device and a battery pack, the tab welding support device comprises an end plate and at least one support frame; the support frame is connected to the end plate, and the support frame is used for placing a tab of a battery cell; the support frame is provided with at least one clearance groove corresponding to the tab, and a welding seam of the tab and the support frame form a specified interval through the clearance groove. The influence of high temperature generated when the tabs are welded at the weld joints on the support frame can be effectively isolated through the clearance grooves, glue melting caused by the high temperature generated by welding of the support frame is avoided, welding burst points and insufficient welding are avoided, the welding yield is improved, the mechanical and electrical connection strength of the tabs at the welding points of the weld joints is ensured, and the service life of the tabs is prolonged. The risk that the battery cell is broken or falls off in the using process is avoided, the performance stability of the battery cell in the charging and discharging process can be effectively guaranteed, the service life of the battery is prolonged, and the safety of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to an ear welding support device and a battery pack. Background Art

[0002] At present, when welding the existing battery cell tabs, a support frame made of plastic material is usually used to provide support for the welding of the battery cell tabs. However, when the battery cell tabs are directly lapped on the support surface of the support frame for welding, the high temperature generated by welding is likely to melt the position corresponding to the weld between the support frame and the battery cell tabs, causing the high-temperature molten glue to adhere to the weld of the battery cell tabs, resulting in problems such as welding explosion points and false soldering. This leads to insufficient mechanical and electrical connection strength at the welding points of the battery cell tabs at the welds, making them prone to breakage or detachment during the use of the battery cell. Moreover, poor welding of the battery cell tabs at the welds is likely to cause unstable performance during the charging and discharging process of the battery cell, affecting the service life and safety of the battery. Content of the Utility Model

[0003] The main purpose of the utility model is to provide an ear welding support device and a battery pack, aiming to solve the technical problem that when the existing battery cell tabs are directly lapped on the support surface of the support frame for welding, welding explosion points and false soldering are likely to occur.

[0004] To achieve the above-mentioned utility model purpose, the utility model provides an ear welding support device, which includes an end plate and at least one support frame;

[0005] The support frame is connected to the end plate, and the support frame is used for placing the tabs of the battery cell;

[0006] At least one clearance groove corresponding to the tab is arranged on the support frame, and a specified interval is formed between the weld of the tab and the support frame through the clearance groove.

[0007] Further, a plurality of hooks are arranged on the support frame, and a plurality of slots corresponding to the hooks are arranged on the end plate. The support frame is connected to the end plate by being snap-fitted into the slots through the hooks.

[0008] Further, the support frame includes a top plate and a frame arranged on the top plate. An accommodation chamber is formed by enclosing the frame and the top plate, and a plurality of reinforcing ribs arranged in a staggered manner are arranged in the accommodation chamber.

[0009] Further, the frame includes an upper frame, the clearance groove is arranged on the upper frame, and a positioning groove communicated with the clearance groove is arranged on the upper frame.

[0010] Further, the frame further includes side frames, the hook includes a connecting portion and a clamping portion, the connecting portion is disposed on the side frame, the clamping portion is disposed at one end of the connecting portion away from the top plate, and the clamping portion protrudes from the side frame.

[0011] Further, the card slot includes a slot and a clamping baffle, the clamping baffle is disposed at the edge of the slot to form an insertion opening with an open top end, and a specified gap is provided on a side of the clamping baffle adjacent to the insertion opening.

[0012] Further, a first insertion inclined surface is provided at one end of the clamping portion away from the connecting portion, a second insertion inclined surface is provided on a side of the clamping baffle close to the insertion opening, and the first insertion inclined surface corresponds to the second insertion inclined surface.

[0013] Further, the support frame includes a support portion and a welding buckle portion, the welding buckle portion is disposed on the support portion, and the length of the welding buckle portion is greater than the length of the support portion, and an avoidance opening for voltage acquisition is formed at the end of the support portion and the welding buckle portion.

[0014] Further, an avoidance platform is provided on a side of the welding buckle portion close to the battery cell, and the avoidance platform extends along the entire length direction of the welding buckle portion.

[0015] Further, the depth of the clearance groove is 0.3 mm to 0.5 mm.

[0016] Further, the length of the clearance groove is greater than or equal to the length of the weld seam, and the width of the clearance groove is greater than or equal to the width of the weld seam.

[0017] Further, the support frame is made of a material in which polybutylene terephthalate and glass fiber are mixed in a mass ratio of 7:3.

[0018] The present utility model further provides a battery pack, including the ear welding support device according to any one of the above, and further including a box body, and the ear welding support device is fixedly connected to the box body through the end plate.

[0019] Beneficial effects:

[0020] A tab welding support device of the present utility model includes an end plate and at least one support frame; the support frame is connected to the end plate, and the support frame is used to place the tabs of the battery cell; at least one clearance groove corresponding to the tabs is provided on the support frame, and a specified interval is formed between the welding seam of the tabs and the support frame through the clearance groove. Therefore, the clearance groove can effectively isolate the influence of the high temperature generated during the welding of the tabs at the weld seam on the support frame, avoid the support frame from melting due to the high temperature generated by welding, avoid welding explosion points and false soldering, improve the welding yield, ensure the mechanical and electrical connection strength of the welding points at the welding seam of the tabs, avoid the risk of breakage or detachment during the use of the battery cell, and can effectively ensure the performance stability of the battery cell during the charging and discharging process, improve the service life and safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of a tab welding support device according to an embodiment of the present utility model;

[0022] Figure 2 is a schematic diagram of the overall structure of the end plate according to an embodiment of the present utility model;

[0023] Figure 3 is an embodiment of the present utility model Figure 2 partial schematic view at A;

[0024] Figure 4 is a front view of the support frame according to an embodiment of the present utility model;

[0025] Figure 5 is an embodiment of the present utility model Figure 4 partial schematic view at B;

[0026] Figure 6 is a rear view of the support frame according to an embodiment of the present utility model;

[0027] Figure 7 is a top view of the tab welding support device according to an embodiment of the present utility model;

[0028] Figure 8 is an embodiment of the present utility model Figure 7 partial schematic view at C;

[0029] Figure 9 is an embodiment of the present utility model Figure 7 cross-sectional view taken along line A-A;

[0030] Figure 10 is an embodiment of the present utility model Figure 9 partial schematic view at D.

[0031] Wherein:

[0032] 1. End plate; 2. Support frame; 3. Battery cell; 4. Tab; 5. Clearance groove; 6. Weld seam; 7. Hook; 8. Slot;

[0033] 20. Top plate; 22. Reinforcing rib;

[0034] 210. Upper frame; 211. Positioning groove; 212. Side frame; 213. Lower frame;

[0035] 220. First reinforcing rib; 221. Second reinforcing rib;

[0036] 23. Support part; 24. Welding buckle part; 25. Avoidance opening; 26. Avoidance platform;

[0037] 30. First battery cell; 31. Second battery cell;

[0038] 40. Negative tab; 41. Positive tab;

[0039] 70. Connection part; 71. Clamping part; 72. First insertion inclined plane;

[0040] 80. Slot; 81. Clamping baffle; 82. Second insertion inclined plane; 83. Reinforcing block.

[0041] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0042] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0043] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0044] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. It can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0046] Referring to Figure 1 , Figures 7 - 10 , this embodiment provides a tab welding support device, which includes an end plate 1 and at least one support frame 2;

[0047] The support frame 2 is connected to the end plate 1, and the support frame 2 is used to place the tab 4 of the battery cell 3;

[0048] At least one clearance groove 5 corresponding to the tab 4 is provided on the support frame 2, and a specified interval is formed between the welding seam 6 of the tab 4 and the support frame 2 through the clearance groove 5.

[0049] In the above embodiments, the tab welding support device includes an end plate 1 and at least one support frame 2. The support frame 2 is connected to the end plate 1. The support frame 2 is used to lap the tab 4 of the battery cell 3, and the tab 4 is in complete fit with the support frame 2. One support frame 2 corresponds to two battery cells 3, and the two battery cells 3 are assembled from top to bottom. The first battery cell 30 is located below and the extended negative tab 40 first laps on the support frame 2. Secondly, the second battery cell 31 is located above the first battery cell 30 and the extended positive tab 41 laps on the top of the negative tab 40 to form the tab 4 to be welded; at least one clearance groove 5 is provided on the support frame 2, and the clearance groove 5 corresponds to the tab 4 attached to the support frame 2. When the tab 4 is attached to the support frame 2 and welded by a welding tooling, the welding seam 6 of the tab 4 is directly above the clearance groove 5, and the welding seam 6 of the tab 4 forms a specified interval from the support frame 2 through the clearance groove 5, so that after the welding seam 6 and the laser port of the welding tooling are on the same vertical line, the laser welding operation can be started. Therefore, the specified interval formed by the clearance groove 5 and the welding seam 6 of the tab 4 can effectively isolate the influence of the high temperature generated during the welding of the tab 4 at the weld on the support frame 2, avoid the support frame 2 from melting due to the high temperature generated by welding, avoid welding explosion points and false soldering, improve the welding yield, ensure the mechanical and electrical connection strength of the welding point of the tab 4 at the welding seam 6, avoid the risk of breakage or detachment during the use of the battery cell 3, and can effectively ensure the performance stability of the battery cell 3 during charging and discharging, improve the service life and safety of the battery.

[0050] Furthermore, the depth of the clearance groove 5 is preferably 0.3 mm to 0.5 mm. The length of the clearance groove 5 is greater than or equal to the length of the welding seam 6 of the tab 4, and the width of the clearance groove 5 is greater than or equal to the width of the welding seam 6 of the tab 4. An insulation layer can be formed through appropriate depth, length and width to effectively isolate the high temperature generated during welding and protect the support frame 2 from thermal damage, ensuring that the tab 4 can avoid the influence of the high temperature generated by welding the tab 4 on the support frame 2 when welding at the welding seam 6; in addition, the support frame 2 is formed by mixing PBT (Polybutylene Terephthalate) and GF (Glass Fiber). The mass ratio of PBT to GF is 7:3. Compared with the existing support frame 2 made of PC (Polycarbonate) material, the melt temperature of the material formed by mixing PBT and GF reaches 230°C to 260°C, which can effectively resist the high temperature heat conduction during the laser welding of the tab 4 of the battery cell 3, avoid the support frame 2 from melting due to the high temperature generated by welding, improve the mechanical strength and rigidity of the entire support frame 2, reduce the dimensional change caused by temperature change during welding, and make the support frame 2 more stable during welding.

[0051] Referring to Figures 2 - 4 , in one embodiment, a plurality of hooks 7 are provided on the support frame 2, and a plurality of slots 8 corresponding to the hooks 7 are provided on the end plate 1. The support frame 2 is connected to the end plate 1 by being snap-fitted into the slots 8 through the hooks 7.

[0052] In the above embodiment, a plurality of hooks 7 are provided on the support frame 2. In addition, a plurality of slots 8 are provided on the side of the end plate 1 close to the support frame 2, and the hooks 7 and the slots 8 are arranged corresponding to each other. The hooks 7 and the slots 8 can withstand a downward pressure of the welding tool greater than or equal to 40 N, so that the hooks 7 are snap-fitted into the slots 8, that is, the support frame 2 is connected to the end plate 1 by being snap-fitted into the slots 8 through the hooks 7. When assembling the support frame 2, a plurality of support frames 2 are sequentially assembled onto the end plate 1 from top to bottom. The snap-fitting connection between the hooks 7 and the slots 8 simplifies the assembly process of the support frame 2 and the end plate 1, improves the assembly efficiency, and the snap-fitting connection method between the hooks 7 and the slots 8 can achieve quick disassembly and assembly, facilitating the quick replacement or maintenance of the support frame 2 on the production line, reducing the need for additional fasteners or tools, and simplifying the assembly process.

[0053] Referring to Figures 4 - 6 , in one embodiment, the support frame 2 includes a top plate 20 and a frame 21 provided on the top plate 20. An accommodation chamber is formed by enclosing the frame 21 and the top plate 20, and a plurality of staggered reinforcing ribs 22 are provided in the accommodation chamber.

[0054] In the above embodiment, the support frame 2 includes a top plate 20 and a frame 21. The frame 21 is disposed on the edge of the top plate 20, and an accommodating chamber with one end open is formed by enclosing the frame 21 and the top plate 20. The top plate 20 is disposed at one end of the frame 21 close to the battery cell 3, and the opening of the accommodating chamber faces the direction of the end plate 1. Additionally, a plurality of reinforcing ribs 22 are disposed in the accommodating chamber, and the height of the reinforcing ribs 22 in the accommodating chamber is less than or equal to the height of the frame 21. At the same time, the reinforcing ribs 22, the top plate 20 and the frame are an integral part. The reinforcing ribs 22 include a plurality of first reinforcing ribs 220 and a plurality of second reinforcing ribs 221. The first reinforcing ribs 220 are arranged along the length direction of the accommodating chamber, and the second reinforcing ribs 221 are arranged along the width direction of the accommodating chamber, so that a plurality of grid structures are formed in the accommodating chamber by the crisscross arrangement of the plurality of first reinforcing ribs 220 and the plurality of second reinforcing ribs 221. That is, by the plurality of first reinforcing ribs 220 and the plurality of second reinforcing ribs 221, while reducing the overall weight of the entire support frame 2, the stiffness of the entire support frame 2 is effectively improved. When the welding tool applies a force to the tab 4 on the support frame 2 to closely fit the tab 4 and the support frame 2 together without gaps for welding, the presence of the reinforcing ribs 22 improves the stability of the support frame 2 during the welding process, reduces the displacement caused by welding vibration or external force, improves the welding quality, and reduces the risk of virtual welding and poor welding.

[0055] Referring to Figures 4 - 6 , in one embodiment, the frame 21 includes an upper frame 210. The clearance groove 5 is disposed on the upper frame 210, and a positioning groove 211 communicating with the clearance groove 5 is disposed on the upper frame 210.

[0056] In the above embodiment, the frame 21 includes an upper frame 210 and a lower frame 213. The upper frame 210 and the lower frame 213 are oppositely arranged. The clearance groove 5 is arranged on the upper frame 210. At least two positioning grooves 211 are further arranged on the upper frame 210. The positioning grooves 211 are located at both ends of the upper frame 210 and extend in a direction away from the clearance groove 5. The positioning grooves 211 are in communication with the clearance groove 5. In addition, the width of the positioning groove 211 is smaller than the width of the clearance groove 5, and the depth of the positioning groove 211 is the same as the depth of the clearance groove 5. When the positioning groove 211 communicates with the clearance groove 5, the positioning groove 211 is located at the middle position on the side of the clearance groove 5. When there are two clearance grooves 5, the two clearance grooves 5 are symmetrically arranged on the upper frame 210 and are spaced apart on the upper frame 210 so that the two clearance grooves 5 are in a non-communicating state. The positioning groove 211 is arranged at one end of the clearance groove 5 away from the other clearance groove 5. When the tab 4 is placed on the support frame 2, the tab 4 completely blocks the clearance groove 5 but does not block the positioning groove 211. When the welding tool starts welding, the welding tool determines the position of the welding seam 6 of the tab 4 by laser sensing the positioning grooves 211 at both ends of the upper frame 210, ensuring the welding quality with an accurate welding position, reducing welding defects, avoiding damage to the tab 4 or the support frame 2, and improving the welding accuracy.

[0057] Referring to Figures 4 - 6 , in an embodiment, the frame 21 further includes a side frame 212. The hook 7 includes a connecting portion 70 and a clamping portion 71. The connecting portion 70 is arranged on the side frame 212, and the clamping portion 71 is arranged at one end of the connecting portion 70 away from the top plate 20, and the clamping portion 71 protrudes from the side frame 212.

[0058] In the above embodiment, the frame 21 further includes side frames 212. The two side frames 212 are respectively connected to both ends of the upper frame 210 and the lower frame 213, and the two side frames 212, the upper frame 210 and the lower frame 213 are an integral part. Additionally, the hooks 7 are preferably two and symmetrically arranged on the two side frames 212, which helps to ensure the uniform assembly of the support frame 2 on the end plate 1, improves the consistency of the assembly, and the hook 7 includes a connecting portion 70 and a clamping portion connected to the connecting portion 70. The connecting portion 70 is arranged on the side frame 212 and the connecting length is the same as the width of the side frame 212, so that the side of the connecting portion 70 close to the top plate 20 is in the same plane as the top plate 20, and the connecting portion 70 extends and protrudes away from the top plate 20. At the same time, a circular arc chamfer is formed at the connection between the connecting portion 70 and the side frame 212. The clamping portion 71 is arranged at one end of the connecting portion 70 away from the top plate 20, so that the clamping portion 71 protrudes from the side frame 212, and the clamping portion 71 provides a larger contact area and stronger mechanical locking when clamped on the slot 8, enhancing the connection strength between the support frame 2 and the end plate 1. At the same time, when the support frame 2 is snap-connected to the end plate 1, the end of the frame 21 away from the top plate 20 is closely attached to the end plate 1, improving the stability of the support frame 2 connected to the end plate 1. And there is a certain gap directly formed between the side of the clamping portion 71 close to the side frame 212 and the side frame 212. Additionally, the connecting portion 70, the clamping portion 71 and the side frame 212 are an integral part, effectively ensuring the overall stability and rigidity of the hook 7 and the support frame 2, and reducing the deformation during the welding process.

[0059] Referring to Figures 2 - 3 , in an embodiment, the slot 8 includes a slot 80 and a clamping baffle 81. The clamping baffle 81 is arranged on the edge of the slot 80 to form an insertion opening with an open top, and a specified gap is arranged on one side of the clamping baffle 81 adjacent to the insertion opening.

[0060] In the above embodiments, the card slot 8 includes a slot 80 and a clamping baffle 81. The slot 80 is provided on the end plate 1 and extends inward for a certain depth. The clamping baffle 81 is provided at the edge of the slot 80, and the clamping baffle 81 is preferably L-shaped, so that the clamping baffle 81 is connected to the edges on both sides of the slot 80. At the same time, an insertion opening for the clamping portion 71 to enter and exit is formed between the top end of the clamping baffle 81 and the slot 80. And a specified gap is formed at one side edge of the clamping baffle 81 adjacent to the insertion opening, that is, the clamping baffle 81 is not connected to the edge of the slot 80 at the specified gap. When the clamping portion 71 is clamped in the card slot 8 through the insertion opening, through the specified gap formed by the clamping baffle 81 and the slot 80, the clamping baffle 81 can provide a certain elastic deformation effect during the buckling process of the clamping portion 71, so that the clamping baffle 81 allows elastic deformation within a certain range, making the assembly process of the card hook 7 and the card slot 8 more flexible. And the clamping baffle 81 can provide an adaptive fit, making it easier for the clamping portion 71 to be inserted and clamped, effectively improving the assembly efficiency. In addition, at the end of the clamping baffle 81 far from the insertion opening, that is, at the bottom of the clamping baffle 81, a reinforcing block 83 is integrally connected. The structural strength of the entire clamping baffle 81 is significantly improved through the reinforcing block 83, making it more wear-resistant and anti-deformation. And when the support frame 2 is snap-connected to the end plate 1 and the welding tooling applies a force to the support frame 2, the overall load-bearing capacity of the card slot 8 can be improved through the reinforcing block 83, reducing damage caused by frequent use.

[0061] Referring to Figures 2 - 5 , in an embodiment, a first insertion inclined surface 72 is provided at one end of the clamping portion 71 far from the connecting portion 70, a second insertion inclined surface 82 is provided on one side of the clamping baffle 81 close to the insertion opening, and the first insertion inclined surface 72 corresponds to the second insertion inclined surface 82.

[0062] In the above embodiments, at one end of the clamping portion 71 away from the connecting portion 70, that is, at the free end of the clamping portion 71, a first insertion inclined surface 72 is provided. The first insertion inclined surface 72 is located on the inner side of the clamping portion 71 facing the top plate 20, and the first insertion inclined surface 72 inclines from the top to the bottom at the end of the clamping portion 71 away from the connecting portion 70. At one end of the clamping baffle 81 close to the insertion opening, that is, at the top end of the clamping baffle 81, a second insertion inclined surface 82 is provided. The second insertion inclined surface 82 is located on the inner side of the clamping baffle 81 facing the slot 80, and the second insertion inclined surface 82 inclines from the top to the bottom at the top end of the clamping baffle 81. At the same time, the first insertion inclined surface 72 and the second insertion inclined surface 82 are in a corresponding state during clamping, and the inclination angle of the first insertion inclined surface 72 is the same as the inclination angle of the second insertion inclined surface 82. When the clamping portion 71 is snap-connected into the slot 80, the inclined surface design of the first insertion inclined surface 72 and the second insertion inclined surface 82 enables the clamping portion 71 to be inserted into the slot 80 more smoothly, reducing the friction and the required force during insertion, so that the clamping portion 71 can be quickly and accurately snapped into the slot 80, improving the assembly efficiency.

[0063] Referring to Figures 4 - 6 , in one embodiment, the support frame 2 includes a support portion 23 and a welded snap portion 24. The welded snap portion 24 is provided on the support portion 23, and the length of the welded snap portion 24 is greater than the length of the support portion 23. An avoidance opening 25 for voltage acquisition is formed between the end of the support portion 23 and the welded snap portion 24.

[0064] In the above embodiments, the support frame 2 includes a support portion 23 and a welded snap portion 24, wherein the welded snap portion 24 is provided on the support portion 23, and the support portion 23 and the welded snap portion 24 are an integral part. The hook 7 and the clearance groove 5 are provided on the welded snap portion 24. At the same time, the length of the welded snap portion 24 is greater than the length of the support portion 23. When the support portion 23 is connected to one end of the welded snap portion 24 away from the clearance groove 5, an avoidance opening 25 with a certain width is formed between the end of the support portion 23 and the welded snap portion 24. The voltage acquisition device is connected to the avoidance opening 25 to acquire voltage. The design of the avoidance opening 25 effectively utilizes the space of the support frame 2, provides an installation position for the voltage acquisition device, and the support portion 23 is preferably arranged at the middle position of the welded snap portion 24, so that two avoidance openings 25 are respectively formed between the two ends of the support portion 23 and the welded snap portion 24. Placing the support portion 23 at the center of the welded snap portion 24 can provide better weight distribution and balance, reduce stress concentration caused by eccentricity, and help to more evenly distribute the stress exerted on the tab 4 by the welding tool during welding. In addition, voltage acquisition at both ends can provide more comprehensive battery state information, which helps to improve the accuracy and reliability of voltage measurement.

[0065] Referring to Figures 4 - 6, in one embodiment, an avoidance platform 26 is provided on a side of the welding buckle portion 24 close to the battery cell 3, and the avoidance platform 26 extends along the entire length direction of the welding buckle portion 24.

[0066] In the above embodiment, an avoidance platform 26 is provided on the welding buckle portion 24, wherein the avoidance platform 26 is located on a side of the welding buckle portion 24 close to the battery cell 3, and the avoidance platform 26 extends along the entire length direction of the welding buckle portion 24, so that the shape of the welding buckle portion 24 is preferably L-shaped. When the tab 4 of the battery cell 3 is lapped on the support frame 2, the negative tab 40 of the first battery cell 30 can be bent at the avoidance platform 26 of the welding support portion 23 due to its longer length. A space is provided by the avoidance platform 26 with a certain width, so that when the end of the negative tab 40 of the first battery cell 30 close to the avoidance platform 26 is bent, a first-end bent tab 4 with a certain width can be formed with the battery cell 3, avoiding directly bending the negative tab 40 of the first battery cell 30 at the tab outlet of the battery cell 3, which helps to reduce the breakage or damage of the negative tab 40 of the first battery cell 30. Moreover, through the avoidance platform 26, the tabs 4 on adjacent support frames 2 can be effectively prevented from contacting each other, reducing the risk of short circuit or mutual interference, reducing the risk of electrical faults, and ensuring the safety performance of the battery cell 3.

[0067] This embodiment provides a battery pack, which includes the tab welding support device described in any one of the above embodiments, and further includes a box body, and the tab welding support device is fixedly connected to the box body through the end plate 1.

[0068] In the above embodiment, the battery pack includes a tab welding support device and further includes a box body, and the tab welding support device is fixedly connected to the box body through the end plate 1. The fixed connection method is preferably bolt connection, which ensures the fixed position of the tab welding support device in the battery pack, reduces vibration and displacement during use, and uses the end plate 1 as a connection component, simplifying the assembly process of the tab welding support device and the box body, helping to improve the assembly efficiency of the production line and reducing the assembly time.

[0069] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A tab welding support device, characterized in that: including an end plate and at least one support frame; The support frame is connected to the end plate, and the support frame is used to place the tabs of the battery cell; The support frame is provided with at least one air-avoiding groove corresponding to the pole lug, and the welding seam of the pole lug forms a specified interval with the support frame through the air-avoiding groove.

2. The tab welding support device according to claim 1, characterized in that: The support frame is provided with a plurality of hooks, and the end plate is provided with a plurality of slots corresponding to the hooks. The support frame is connected to the end plate in the slots through the hooks.

3. The tab welding support device according to claim 2, characterized in that: The support frame includes a top plate and a frame arranged on the top plate, wherein a receiving chamber is formed by the frame and the top plate, and a plurality of reinforcing ribs arranged in a staggered manner are arranged in the receiving chamber.

4. The tab welding support device according to claim 3, characterized in that: The frame comprises an upper frame, the air-avoiding groove is arranged on the upper frame, and a positioning groove communicating with the air-avoiding groove is arranged on the upper frame.

5. The tab welding support device according to claim 3, characterized in that: The frame also includes a side frame, and the hook includes a connecting portion and a clamping portion, the connecting portion is arranged on the side frame, the clamping portion is arranged at an end of the connecting portion away from the top plate, and the clamping portion protrudes from the side frame.

6. The tab welding support device according to claim 5, characterized in that: The card slot comprises a slot and a card-connecting baffle plate, wherein the card-connecting baffle plate is arranged at the edge of the slot to form an insertion interface with a top opening, and a designated gap is arranged on one side of the card-connecting baffle plate adjacent to the insertion interface.

7. The tab welding support device according to claim 6, characterized in that: A first plugging slope is arranged at one end of the clamping portion away from the connecting portion, a second plugging slope is arranged at one side of the clamping baffle plate close to the plug port, and the first plugging slope corresponds to the second plugging slope.

8. The tab welding support device according to claim 1, characterized in that: The support frame includes a support portion and a welding buckle portion, wherein the welding buckle portion is arranged on the support portion, and the length of the welding buckle portion is greater than the length of the support portion, and an escape opening for voltage collection is formed between the end of the support portion and the welding buckle portion.

9. The tab welding support device according to claim 8, characterized in that: A avoidance platform is arranged on one side of the welding buckle portion close to the battery core, and the avoidance platform extends along the entire length direction of the welding buckle portion.

10. The tab welding support device according to claim 1, characterized in that: The depth of the air-avoiding groove is 0.3 mm to 0.5 mm.

11. The tab welding support device according to claim 1, characterized in that: The length of the air avoidance groove is greater than or equal to the length of the welding seam, and the width of the air avoidance groove is greater than or equal to the width of the welding seam.

12. The tab welding support device according to claim 1, characterized in that: The support frame is made of a material obtained by mixing polybutylene terephthalate and glass fiber in a mass ratio of 7:

3.

13. A battery pack, characterized in that: It comprises the pole tab welding support device according to any one of claims 1 to 12, and also comprises a box body, and the pole tab welding support device is fixedly connected to the box body through the end plate.

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