Chip and battery module

Abstract

The utility model provides a bar and a battery module, and relates to the technical field of battery modules, the bar comprises a bridging bar welding assembly and a longitudinal connection buffer structure, the bridging bar welding assembly comprises at least one row of series-parallel bar group, the series-parallel bar group comprises at least two adjacent welding bars, and the longitudinal connection buffer structure is arranged in the longitudinal connection buffer structure. A battery cell welding area is arranged on the welding bar; the longitudinal connection buffer structure comprises a first buffer structure and a second buffer structure which are positioned between two adjacent welding bars; the first buffer structure is connected with two adjacent welding bars, and the first buffer structure is sunken towards one side relative to the plane of the welding bars; the second buffer structure enables the tail ends of the two adjacent welding chips to be divided into independent states, so that the stress of the chips caused by mutual pulling of different areas of the chips in the battery module due to the influence of the battery cell or the risk of cracks of the welding structure between the chips and the battery cell pole is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery modules, and in particular to a battery cell and a battery module. Background Art

[0002] During the battery module molding process, for the multi-parallel design of the battery module, it is necessary to first arrange multiple battery cells in a series-parallel relationship, and then realize the connection between the multiple parallel battery cells by welding the bar. A flexible printed circuit (FPC) is arranged above the bar, and the flexible circuit board FPC is electrically connected to the battery cell and the battery management system (BMS). At present, the battery modules on the market generally realize the high-voltage circuit conduction of the battery module by welding the bar to the battery cell pole, so as to realize the series and parallel connection of multiple battery cells. In the existing battery modules, two adjacent battery modules are electrically connected through a adapter assembly. The adapter assembly includes a fixed column and a copper busbar, with many components and a complex connection structure. This means that based on the layout of the existing battery module, the flexible circuit board FPC needs to open multiple molds, which has high manufacturing costs and low efficiency.

[0003] Aluminum jumpers are currently available that can replace existing adapter components, eliminating the need for fixed columns and copper busbars and simplifying the connection structure. However, for modules connected in parallel, these jumpers occupy a large area and take up considerable space. Furthermore, to provide buffering features, their structure is often complex. This is particularly true for jumper-connected modules with two rows. Because the cells in each row expand at different rates, the jumper cannot accommodate the varying degrees of displacement of the cells in the two rows, creating a risk of design imbalance.

[0004] Therefore, there is an urgent need for a jumper bar and a battery module with a simple design and strong buffering capability. Utility Model Content

[0005] The present application provides a battery cell and a battery module to solve the problem that the current battery cell design is complex and has poor buffering capacity.

[0006] In a first aspect, the present application provides a bar, including: a jumper bar welding assembly, including at least one row of series-parallel bar groups, the series-parallel bar groups including at least two adjacent welding bars, and the welding bars having a battery cell welding area.

[0007] The longitudinal connection buffer structure includes a first buffer structure and a second buffer structure located between two adjacent welding bars. The first buffer structure connects the two adjacent welding bars and is located at the front end of the area between the two adjacent welding bars. The first buffer structure is recessed to one side relative to the plane of the welding bars. The second buffer structure is located at the rear end of the area between the two adjacent welding bars and is a through groove that runs through the area between the two adjacent welding bars, so that the rear ends of the two adjacent welding bars are separated into independent states, and the direction from the front end to the rear end is perpendicular to the arrangement direction of the two adjacent welding bars. The width of the first buffer structure is greater than the width of the second buffer structure, and the width direction is the arrangement direction of the two adjacent welding bars. Because the rear ends of the two adjacent welding bars are separated into independent states by the dividing groove, when the welding bars are welded to the battery cells, if there is a difference in height between the two adjacent battery cells, the two adjacent welding bars can independently adjust the height of each contact surface of the battery cell to absorb the height tolerance of the corresponding battery cell assembly, achieving higher adaptability. Optionally, the second buffer structure includes a connected arc-shaped buffer opening and a dividing groove. The arc-shaped buffer opening is located at the junction of the dividing groove and the first buffer structure, and the maximum width of the arc-shaped buffer opening is greater than the width of the dividing groove. The arc-shaped buffer opening is located between the first buffer structure and the dividing groove, forming a transition between the first buffer structure and the dividing groove. At the same time, the arc-shaped buffer opening can reduce stress concentration under the stamping feature.

[0008] Optionally, the shortest distance between the edges of the two battery cell welding areas on two adjacent welding bars is a first distance, and the maximum width of the first buffer structure is smaller than the first distance. The wider the first buffer structure, the stronger the adjacent welding bars will be.

[0009] Optionally, the shortest distance from the front end of the welding bar to the edge of the battery cell welding area is the second distance, the first buffer structure extends from the front end of the welding bar toward the rear end, and the length does not exceed the second distance, and / or the shortest distance from the rear end of the welding bar to the edge of the battery cell welding area is a fourth distance h, and the fourth distance h is greater than the second distance y. The shorter the length of the first buffer structure, the smaller the resistance when two adjacent welding bars are separated, and the easier it is to separate, so that the independent buffering performance of the welding bar is stronger. The fourth distance h is greater than the second distance y, so that the area from the battery cell welding area to the front end of the welding bar is larger than the area from the battery cell welding area to the rear end, which is more conducive to heat dissipation of the bar.

[0010] Optionally, when the cross-bar welding assembly includes multiple rows of serial-parallel bar groups, the bar further includes: a transverse connecting buffer structure provided between each two adjacent rows of serial-parallel bar groups, the transverse connecting buffer structure connecting the two adjacent rows of serial-parallel bar groups, and the transverse connecting buffer structure is recessed to one side relative to the plane of the welding bar. This recess allows the transverse connecting buffer structure to form a folded structure perpendicular to the arrangement direction of the two adjacent rows of welding bar groups, so that the adjacent welding bar groups can be extended away from each other or squeezed toward each other as needed.

[0011] Optionally, when the jumper bar welding assembly includes multiple rows of series-parallel bar groups, the closest distance between the edges of two battery cell welding areas on two adjacent rows of welding bar groups is a third distance, and the maximum width of the transverse connection buffer structure is less than the third distance. The transverse connection buffer structure does not exceed the third distance to avoid affecting the flow performance between two adjacent rows of welding bar groups.

[0012] Optionally, a converging groove is provided at the intersection of the transverse and longitudinal connecting buffer structures. The converging groove allows the transverse and longitudinal connecting buffer structures to extend or fold independently of each other. Furthermore, since the converging groove is hollow, the overall weight of the bar is reduced, thereby achieving the purpose of cost and weight reduction.

[0013] Optionally, the length of the intersection groove is greater than or equal to the width of the corresponding transverse connecting buffer structure, and the width of the intersection groove is greater than or equal to the width of the corresponding first buffer region. The side of the intersection groove corresponding to the transverse connecting buffer structure should be at least equal to the width of the transverse connecting buffer structure, thereby ensuring that the transverse connecting buffer structure is not restricted by the intersection when extended; the side of the intersection groove corresponding to the longitudinal connecting buffer structure should be at least equal to the width of the longitudinal connecting buffer structure, thereby ensuring that the longitudinal connecting buffer structure is not restricted by the intersection when extended.

[0014] Optionally, the cross-bar welding assembly, the longitudinal connection buffer structure and / or the transverse connection buffer structure are integrally formed. This results in a non-spliced ​​design for the entire bar, thereby simplifying the design and process steps of the bar and greatly reducing manufacturing costs. With the bar and battery module provided in each possible design of the first aspect and the second aspect, since the longitudinal connection buffer structure is located between two adjacent cross-bar welding assemblies, the longitudinal connection buffer structure includes a first buffer structure and a second buffer structure. The first buffer structure is recessed to one side relative to the plane of the welding bar, and the recess forms a folding structure in a direction perpendicular to the arrangement direction of the two adjacent welding bars, so that the adjacent welding bars can be extended in a direction away from each other or squeezed in a direction close to each other as needed. The second buffer structure is located at the tail end of the area between two adjacent welding tabs, so that the tail ends of the two adjacent welding tabs are divided into an independent state. When welding with the battery cell, if there is a difference in height between the two adjacent battery cells, the two adjacent welding tabs can independently adjust the height of contact with the surface of the battery cell pole according to the height difference of the battery cells, thereby meeting the different degrees of swelling and displacement matching design between the battery cells, avoiding the different areas of the tabs in the battery module being affected by the battery cells and pulling each other, causing stress on the tabs, or the risk of cracks in the welding structure between the tabs and the battery cell poles, and the design is simple and has strong buffering capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a bar provided in an embodiment of the present application.

[0016] Figure 2 for Figure 1 A top view of the embodiment structure of the bar structure is provided.

[0017] Figure 3 for Figure 1 The top view of the bar structure provided in the figure shows the distance.

[0018] Figure 4 for Figure 3 A bottom view of the bar structure is provided in FIG.

[0019] Figure 5 for Figure 3 The right side view of the bar structure is provided in .

[0020] Figure 6 This is a schematic diagram of a battery module provided in one embodiment of the present application.

[0021] Figure 7 A schematic diagram of the connection between a three-parallel and two-string battery cell group and a battery strip is provided in one embodiment of the present application.

[0022] Figure 8 for Figure 7 Left view of .

[0023] Among them: 10, bar; 100, welding bar; 110, battery cell welding area; 200, longitudinal connection buffer structure; 210, first buffer structure; 220, second buffer structure; 221, arc-shaped buffer port; 222, dividing groove; 300, transverse connection buffer structure; 400, intersection groove; 20, stacked battery cells; x, first distance; y, second distance; z, third distance. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0026] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists, A and B exist, and B exists. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0028] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the current limiting module of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0029] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0030] In the description of this application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two (including two).

[0031] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, "connected" or "connected" in a mechanical structure can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection via a barrier, such as a screw, bolt, or other barrier. A physical connection can also be a removable connection, such as a snap-fit ​​connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. "Connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as circuit connectivity is achieved. It can also refer to internal communication between two components. A signal connection can refer not only to signal connection through an electrical circuit, but also to signal connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] At present, in order to simplify the adapter assembly, the proposed jumper-type bar occupies a large area and has a complex structure during use. It cannot meet the different degrees of displacement of the battery cells in adjacent or two rows of modules, resulting in insufficient matching between each individual battery cell in the battery module and the corresponding bar. As a result, different areas of the bar in the battery module are affected by the battery cells and pull against each other, causing stress on the bar, or the risk of cracks in the welding structure between the bar and the battery cell pole.

[0033] Research has found that whether it is a single-row or multi-row battery module with jumper connections, the battery cells in each single-row module have a swelling problem, and the degree of swelling of each battery cell is inconsistent. Different degrees of swelling will cause different degrees of displacement of the battery cells. Therefore, the jumper-type bars cannot adapt to the different degrees of displacement of the battery cells in each module.

[0034] The core of this application is to provide a bar and a battery module. By cross-connecting the bar welding assembly and the longitudinal connection buffer structure, the bar can meet the different degrees of displacement of the battery cells in each module, thereby meeting the different degrees of swelling and displacement of each battery cell in each row of battery cell groups in the design, avoiding the risk of stress in the bar due to the influence of the battery cells on different areas of the bar in the battery module, or cracks in the welding structure between the bar and the battery cell pole. The structure is simple and the buffering capacity is strong.

[0035] Figure 1 This is a schematic diagram of the structure of the bar provided in this embodiment. Figure 2 and Figure 3 for Figure 1 Please refer to the top view of the bar structure provided in Figures 1 to 3 In this embodiment, a bar is provided, including a cross-bar welding assembly and a longitudinal connection buffer structure 200.

[0036] The jumper bar welding assembly includes at least one row of series-parallel bar groups, each of which includes at least two adjacent welding bars 100. The welding bars 100 have a battery cell welding area 110. The battery cell welding area 110 is used to connect to the battery cell pole, wherein the connection can be achieved by welding to achieve a fixed connection, or other connection methods that can achieve contact between the battery cell welding area 110 and the battery cell pole.

[0037] The longitudinal connection buffer structure 200 includes a first buffer structure 210 and a second buffer structure 220 located between two adjacent welding bars 100 .

[0038] The first buffer structure 210 connects two adjacent welding bars 100 and is located at the front end of the area between the two adjacent welding bars 100. The first buffer structure 210 is recessed to one side relative to the plane of the welding bars 100. This recess forms a folded structure perpendicular to the arrangement direction of the two adjacent welding bars 100, allowing the adjacent welding bars 100 to extend away from each other or squeeze toward each other as needed.

[0039] The second buffer structure 220 is located at the rear end of the area between two adjacent welding bars 100. It is a through slot that runs through the area between the two adjacent welding bars 100, separating the rear ends of the two adjacent welding bars 100 into independent states. The direction from the front end to the rear end is perpendicular to the arrangement direction of the two adjacent welding bars 100.

[0040] Since the tail ends of two adjacent welding bars 100 are divided into independent states, when welding with battery cells, if there is a difference in height between the two adjacent battery cells, the two adjacent welding bars 100 can independently adjust the height of each contacting battery cell surface to absorb the height tolerance of each battery cell assembly and achieve higher adaptability.

[0041] The width of the first buffer structure 210 is greater than the width of the second buffer structure 220, and the width direction is the arrangement direction of the two adjacent welding bars 100. The width of the second buffer structure 220 can be selected based on actual experience, with the purpose of being able to adapt to the height difference of the battery cells so that the two adjacent welding bars 100 can be separated from each other up and down. For example, under normal circumstances, if the height difference between two adjacent battery cells is 1mm, the width of the second buffer structure 220 is greater than 0.8mm, which can make the two adjacent welding bars adapt to the height difference between the two adjacent battery cells. The width of the second buffer structure 220 can be any value greater than 0.8, for example, the width of the second buffer structure 220 is 1mm, 2mm or 3mm. This width does not need to be strictly limited, as long as the two adjacent welding bars can adapt to the height difference between the two adjacent battery cells through the deformation of the second buffer structure 220.

[0042] It is understood that in this embodiment, the width of the first buffer structure 210 refers to the dimension of the edge of the first buffer structure 210 in the arrangement direction of two adjacent welding bars 100 in the natural state, and the width of the second buffer structure 220 also refers to the dimension of the edge of the second buffer structure 220 in the arrangement direction of two adjacent welding bars 100 in the natural state. The natural state refers to a state in which two adjacent welding bars 100 are not displaced by the battery cells.

[0043] like Figure 3As shown, in some embodiments, the shortest distance between the edges of two battery cell welding regions 110 on two adjacent welding bars 100 is a first distance x, and the maximum width of the first buffer structure 210 is less than the first distance x.

[0044] Please refer to Figure 4 , Figure 4 for Figure 3 In the bottom view of the bar structure provided in FIG, when adjacent welding bars 100 in the same row are affected by the expansion of the battery cell and move away from each other, the first buffer structure 210 can be expanded in the direction corresponding to the welding bars 100 moving away from each other.

[0045] In some embodiments, the shape of the cell welding area 110 corresponds to the shape of the end face of the cell pole. For example, when the cell pole is a cylindrical structure, the end face of the cell pole is circular, and the cell welding area 110 is a circular depression. When the cell pole is a quadrangular prism structure, the end face of the cell pole is rectangular, and the cell welding area 110 is a rectangular depression. The side of the depression protruding from the surface of the welding tab 100 is used for welding to the end face of the cell pole, so as to reduce the impact of other positions of the tab on the contact and connection between the cell welding area 100 and the end face of the cell pole.

[0046] In some embodiments, the cell welding area 110 may also be provided with a through hole, the purpose of which is to observe through the through hole whether the cell welding area 110 is precisely located on the cell pole, so that the tab can be more conveniently and quickly aligned with the cell pole, facilitating welding.

[0047] The edges of the two battery cell welding areas 110 on two adjacent welding bars 100 are the edges of the two sinks on two adjacent welding bars 100 .

[0048] Reference Figure 1 and Figure 2 In this embodiment, the second buffer structure 220 includes a connected arc-shaped buffer opening 221 and a dividing groove 222. The arc-shaped buffer opening 221 is located at the connection between the dividing groove 222 and the first buffer structure 210. The maximum width of the arc-shaped buffer opening 221 is greater than the width of the dividing groove 222.

[0049] The arc-shaped buffer opening 221 is located between the first buffer structure 210 and the dividing groove 222, forming a transition between the first buffer structure 210 and the dividing groove 222. Furthermore, the arc-shaped buffer opening 221 can reduce stress concentration during the manufacturing process of the first buffer structure 210. For example, the arc-shaped buffer opening 221 in this embodiment is in the shape of a teardrop.

[0050] like Figure 3As shown, in this embodiment, the shortest distance from the end of the front end of the welding bar 100 to the edge of the battery cell welding area 110 is the second distance y, and the first buffer structure 210 extends from the end of the front end of the welding bar 100 toward the tail end, and the length of the first buffer structure 210 does not exceed the second distance y. The length of the first buffer structure 210 refers to the size of the first buffer structure 210 from the front end of the welding bar 100 to the intersection with the separation groove 222.

[0051] In this embodiment, since the separation groove 222 is hollow, the overall weight of the bar is relatively reduced, achieving the purpose of reducing cost and weight; and, the separation groove separates the welding bar 100 on both sides, and the welding bar 100 is more easily driven by the battery cell to produce displacement, thereby improving the buffering capacity of the first buffer structure 210.

[0052] Since the current on the bar flows from the battery cell welding area 110 on one welding bar 100 to the battery cell welding area 110 on the adjacent welding bar 100, as long as there is a connected part between the adjacent welding bars 100, the current can pass between the two adjacent welding bars 100. The setting of the first buffer structure 210 can just connect the adjacent welding bars, that is, the current can flow between the adjacent welding bars 100 through the first buffer structure 210. Therefore, the width of the separation groove 222 will not affect the overall current flow capacity of the bar.

[0053] In view of this, the separation groove 222 can be set wider, as long as the width of the separation groove does not exceed the shortest distance between the edges of the battery cell welding area 110 on two adjacent welding bars 100, thereby further reducing the volume and weight of the bar.

[0054] Please continue to refer to Figure 1 , Figure 1 Figure 1 shows a schematic diagram of a bar 10 used in a three-parallel double-row battery module. In this embodiment, when the cross-bar welding assembly includes multiple rows of serial-parallel bar groups, the bar 10 further includes a transverse connecting buffer structure 300 disposed between each two adjacent rows of serial-parallel bar groups. The transverse connecting buffer structure 300 connects the two adjacent rows of serial-parallel bar groups and is recessed to one side relative to the plane of the welding bar 100. This recess allows the transverse connecting buffer structure 300 to form a folded structure perpendicular to the arrangement direction of the two adjacent rows of welding bar 100, thereby allowing adjacent welding bar 100 to extend away from each other or squeeze toward each other as needed.

[0055] It can be understood that the arrangement direction of the multiple rows of serial-parallel bar groups is perpendicular to the arrangement direction of the multiple welded bar groups 100 in each row of serial-parallel bar groups.

[0056] In this embodiment, a recessed structure can be formed by applying external force to the pallet sheet through stamping, thereby forming the first buffer structure 210 and the transverse connecting buffer structure 300. In this embodiment, the recessed direction of the transverse connecting buffer structure 300 can be consistent with the recessed direction of the first buffer structure 210 in the longitudinal connecting buffer structure 200. In this way, when manufacturing the first buffer structure 210 and the transverse connecting buffer structure 300 on the pallet, there is no need to flip the pallet. The first buffer structure 210 and the transverse connecting buffer structure 300 can be manufactured on the same side of the pallet through stamping, which makes the pallet manufacturing process more convenient and faster.

[0057] Please refer to Figure 3 In this embodiment, when the jumper bar welding assembly includes multiple rows of series-parallel bar groups, the closest distance between the edges of the two battery cell welding areas 110 on two adjacent rows of welding bars 100 is the third distance z, and the maximum width of the lateral connection buffer structure 300 is less than the third distance z.

[0058] Please refer to Figure 5 , Figure 5 for Figure 3 As shown in the right side view of the bar structure provided in FIG, when the two rows of battery cells are displaced in a direction away from each other, the transverse connection buffer structure 300 can be correspondingly expanded in a direction away from each other.

[0059] Please refer to Figure 1 and Figure 2 In this embodiment, an intersection groove 400 is provided at the intersection of the horizontal connection buffer structure 300 and the longitudinal connection buffer structure 200 .

[0060] In this embodiment, the intersection groove 400 is provided so that the extension or folding of the transverse connection buffer structure 300 and the longitudinal connection buffer structure 200 do not affect each other. In addition, since the intersection groove 400 is hollow, the overall weight of the bar is reduced, thereby achieving the purpose of reducing cost and weight.

[0061] In this embodiment, the intersection groove 400 is square in shape, the length of the intersection groove 400 can be greater than or equal to the width of the corresponding transverse connection buffer structure 300, and the width of the intersection groove 400 can be greater than or equal to the width of the corresponding first buffer structure 220.

[0062] Since the intersection groove 400 is located at the intersection of the transverse connecting buffer structure 300 and the longitudinal connecting buffer structure 200, in order to ensure greater independence between the two adjacent welding bars 100 connected by the transverse connecting buffer structure 300 and the two adjacent welding bars 100 connected by the longitudinal connecting buffer structure 200, the side of the intersection groove 400 corresponding to the transverse connecting buffer structure 300 should be at least equal to the width of the transverse connecting buffer structure 300, thereby ensuring that the transverse connecting buffer structure 300 is not restricted by the intersection when extending. Similarly, in order to ensure that the longitudinal connecting buffer structure 200 is not restricted by the intersection when extending, the side of the intersection groove 400 corresponding to the longitudinal connecting buffer structure 200 should be at least equal to the width of the longitudinal connecting buffer structure 200. When the length and width of the intersection groove 400 are not less than the width of the corresponding transverse connecting buffer structure 300 or the width of the longitudinal connecting buffer structure 200 (first buffer structure 220), the independence of each welding bar 100 around the intersection groove 400 can be guaranteed.

[0063] Please refer to Figure 3 In this embodiment, the tab also includes a heat dissipation area, which is an area on the welding tab outside the battery cell welding area 110 and is used to dissipate heat from the battery cell. Furthermore, in order to dissipate heat from the battery cell faster, the area of ​​the welding tab can be increased. For example, in some embodiments, the tab also includes a heat dissipation enhancement area 120, which is located at the tail end of the welding tab 100. The shortest distance from the end of the tail end of the welding tab 100 to the edge of the battery cell welding area 110 is a fourth distance h, and the fourth distance h is greater than the second distance y.

[0064] The fourth distance h is the dimension of the heat dissipation enhanced area 120 in one direction.

[0065] In some embodiments, the length of the fourth distance h is 5 mm to 10 mm longer than the length of the second distance y, while the length of the fourth distance h of a traditional bar is generally equal to the length of the second distance y. Compared with the design of a traditional bar, the area of ​​the welded bar 100 in the present application is larger than that of a traditional bar, thereby making the heat dissipation area of ​​the bar larger, thereby improving the heat dissipation capacity of the bar.

[0066] It is understood that the fourth distance h is longer than the second distance y, making the length of the dividing groove 222 longer relative to the length of the first buffer structure 210, which also makes each welded bar 100 more independent. Furthermore, as can be seen from the foregoing, the flow of current through the bar is only related to the connection position between the bars. Therefore, the heat dissipation enhancement area 120 here is not a current flow path and therefore does not affect the current flow capacity of the bar.

[0067] In this embodiment, the bar is integrally formed. Specifically, during the manufacturing process, the bar material can be integrally stamped to form the cross-bar welding assembly, the longitudinal connection buffer structure 200, and the transverse connection buffer structure 300. This allows the entire bar to be seamlessly joined, thereby simplifying the bar design and manufacturing process and significantly reducing the bar manufacturing cost.

[0068] The material of the bar 10 in this embodiment can be aluminum or copper, and can be manufactured using corresponding metals or conductive materials according to specific usage requirements.

[0069] In this embodiment, the features of the first buffer structure 210, the dividing grooves 222, the intersecting grooves 400, and the transverse connecting buffer structure 300 are used to separate each cross-bar welding assembly into independent, non-interfering cell welding areas 110. This allows each welding bar 100 to adapt to battery cells deforming in different directions during the welding process without affecting the overall bar structure.

[0070] Please refer to Figures 6 to 8 , Figure 6 A schematic diagram of a battery module provided in one embodiment of the present utility model; Figure 7 This is a schematic diagram of the connection between a three-parallel and two-string battery cell group and a battery strip provided in one embodiment of the present invention; Figure 8 for Figure 7 Left view. It can be seen that when the distances or heights between the battery cells are inconsistent, the first buffer structure 210 and the transverse connecting buffer structure 300 can be adjusted according to the positions of the individual battery cells, allowing each battery cell welding area to move independently of each other, allowing the tabs to fulfill their bridging function without breaking.

[0071] The inconsistent distance or height between the two cells can be understood as the inconsistent distance or height between two adjacent cells in the same row or adjacent rows, such as Figure 6 The distance or height between adjacent cells along the a-axis, b-axis, and c-axis can be inconsistent. For example, in the same row of cells, two adjacent cells may bulge along the b-axis and may also have different heights along the c-axis (height). In two adjacent rows of cells, the distance between adjacent cells along the a-axis may vary and may also have different heights along the c-axis (height).

[0072] The solution in this embodiment divides the bar into independent welding bars 100, replacing the need to control the flatness of the entire large surface with the need to control the flatness of the small surface of each independent welding bar, thereby reducing the difficulty of the bar manufacturing process.

[0073] Please refer to Figure 6 and Figure 7 In addition to the above-mentioned tabs, a battery module is also provided in this embodiment, including: a battery cell assembly, the battery cell assembly includes at least one row of stacked battery cells 20, and also includes the tab 10 in any of the above-mentioned embodiments, the battery cell poles to be connected are welded to the battery cell welding area on the tab 10, and the longitudinal connection buffer structure is located between two adjacent battery cells.

[0074] A group of cells arranged along the b-axis is considered a row of stacked cells 20. Multiple rows of stacked cells 20 are arranged along the a-axis. Because the expansion of each cell in each row is inconsistent, after the above-mentioned tabs are welded to the corresponding cell poles, each welded tab 100 can adapt to the displacement of each cell when it expands to different degrees. Due to the provision of the horizontal and longitudinal connection buffer structures, the overall buffering capacity of the tab is enhanced, and the tab can achieve higher adaptability to the cell. Through the battery module in this embodiment, each welded tab in the tab is independent, so that each welded tab can release the buffer margin with the cell at the corresponding position, ensuring that the tab as a whole is not damaged when subjected to unbalanced forces.

[0075] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sheet, characterized in that: include: A jumper bar welding assembly includes at least one row of serial-parallel bar groups, each of which includes at least two adjacent welding bars, each of which has a cell welding area; A longitudinally connected buffer structure, the longitudinally connected buffer structure comprising a first buffer structure and a second buffer structure located between two adjacent welding bars; the first buffer structure connects the two adjacent welding bars and is located at the front end of the area between the two adjacent welding bars, the first buffer structure being recessed to one side relative to the plane of the welding bars; the second buffer structure is located at the rear end of the area between the two adjacent welding bars, and is a through groove running through the area between the two adjacent welding bars, so that the rear ends of the two adjacent welding bars are separated into independent states, and the direction from the front end to the rear end is perpendicular to the arrangement direction of the two adjacent welding bars; The width of the first buffer structure is greater than the width of the second buffer structure, and the width direction is the arrangement direction of two adjacent welding bars.

2. The bar sheet according to claim 1, characterized in that: The second buffer structure includes a connected arc-shaped buffer opening and a dividing groove. The arc-shaped buffer opening is located at the connection between the dividing groove and the first buffer structure. The maximum width of the arc-shaped buffer opening is greater than the width of the dividing groove.

3. The bar sheet according to claim 1, characterized in that: The shortest distance between the edges of the two battery core welding areas on two adjacent welding bars is a first distance, and the maximum width of the first buffer structure is smaller than the first distance.

4. The bar sheet according to claim 1, characterized in that: The shortest distance from the front end of the welding bar to the edge of the battery core welding area is a second distance, and the first buffer structure extends from the front end of the welding bar toward the rear end, and the length does not exceed the second distance; and / or, The shortest distance from the end of the tail end of the welding bar to the edge of the battery core welding area is a fourth distance, and the fourth distance is greater than the second distance.

5. The bar sheet according to claim 1, characterized in that: In the case where the cross-bar welding assembly includes multiple rows of series-parallel bar groups, the bar further includes: A transverse connection buffer structure is provided between each two adjacent rows of the series-parallel bar groups, the transverse connection buffer structure connects the two adjacent rows of the series-parallel bar groups, and the transverse connection buffer structure is recessed to one side relative to the plane of the welding bar.

6. The bar sheet according to claim 5, characterized in that: The closest distance between the edges of the two battery cell welding areas on two adjacent rows of the welding bars is a third distance, and the maximum width of the transverse connection buffer structure is less than the third distance.

7. The bar sheet according to claim 5, characterized in that: An intersection groove is provided at a position where the transverse connection buffer structure and the longitudinal connection buffer structure intersect.

8. The bar sheet according to claim 7, characterized in that: The length of the intersection groove is greater than or equal to the width of the corresponding transverse connection buffer structure, and the width of the intersection groove is greater than or equal to the width of the corresponding first buffer structure.

9. The bar sheet according to claim 5, characterized in that: The cross-bar welding assembly, the longitudinal connection buffer structure and / or the transverse connection buffer structure are integrally formed.

10. A battery module, characterized in that: include: A battery cell assembly, the battery cell assembly comprising at least one row of stacked battery cells; It also includes the bar sheet according to any one of claims 1 to 9, wherein the poles of the battery cells to be connected are welded to the battery cell welding areas on the bar sheet, and the longitudinal connection buffer structure is located between two adjacent battery cells.

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