Busbar and battery module

Abstract

The application relates to the technical field of batteries, in particular to a busbar and a battery module. The busbar comprises at least two connecting parts used for electrically connecting with the battery cells on a battery cell support respectively, a fusing part, two ends of which are connected to the at least two connecting parts respectively, and a disconnecting part arranged side by side on at least one side of the fusing part, two ends of each disconnecting part being connected to the at least two connecting parts respectively. The disconnecting part has a connecting state and a disconnecting state. When the busbar is separated from the battery cell support, the disconnecting part is in the connecting state. When the busbar is assembled to the battery cell support, the disconnecting part is transformed from the connecting state to the disconnecting state. The busbar can guarantee the bending strength before installation and the fusing protection capability after installation.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a busbar and a battery module. Background Technology

[0002] Busbars (also known as busbars or connectors) are key components in battery modules that enable electrical connections between multiple cells. They are typically used to connect the positive or negative terminals of at least two cells in parallel or series to achieve the required voltage and capacity. The fuse is a weak point integrated into the busbar; when an overcurrent or short-circuit fault occurs in the circuit, it will preferentially melt at a predetermined current threshold, thereby cutting off the faulty branch, preventing the spread of thermal runaway, and ensuring the safety of the battery module.

[0003] In existing technologies, to reduce problems such as increased contact resistance, overheating, and decreased reliability caused by loose solder joints or connection terminals, an integrated busbar structure with a built-in fuse has been proposed. A common approach is to simply create a fuse hole or locally narrow the cross-section on the aluminum busbar. However, existing integrated busbar structures have the following drawbacks: because the fuse is a narrow area formed by openings or local narrowing, its cross-sectional area is much smaller than the main body, resulting in insufficient mechanical strength. Therefore, it is prone to unexpected bending or deformation during manufacturing, handling, and assembly, making it difficult to meet the positioning and assembly requirements of mass automated production. Furthermore, with the increasing demand for parallel protection accuracy for multi-parallel cylindrical cells, the cross-sectional area of ​​the fuse needs to be further reduced to obtain a more accurate overcurrent fusing threshold, making the mechanical strength issue even more prominent. Summary of the Invention

[0004] The purpose of this invention is to provide a busbar that solves the problem of busbars being prone to deformation and breakage before assembly in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a busbar, comprising: At least two connecting parts are provided for electrical connection to the battery cells on the battery cell support, respectively. At least one fusible link, and the two ends of each fusible link are respectively connected to at least two connecting links; At least one disconnecting part is arranged side by side on at least one side of the fuse part, and the two ends of each disconnecting part are respectively connected to at least two connecting parts; The disconnecting part has a connected state and a disconnected state; when the busbar is separated from the cell support, the disconnecting part is in a connected state, and in the connected state, the disconnecting part is configured to bear the mechanical load of the fuse part; when the busbar is assembled onto the cell support, the disconnecting part changes from the connected state to the disconnected state.

[0006] In some embodiments, the number of the break-off portion is N times the number of the fuse portion, where N≥2, and the break-off portion and the fuse portion are arranged at intervals.

[0007] In some embodiments, in the projection direction perpendicular to the extension direction of the fusible portion, the projections of the deflection portions located on both sides of the same fusible portion are staggered in the extension direction of the fusible portion.

[0008] In some embodiments, the fusible portion has two ends in the extending direction; in the projection direction perpendicular to the extending direction of the fusible portion, the projections of the separation portions located on both sides of the fusible portion are disposed near the ends.

[0009] In some embodiments, in the projection direction perpendicular to the extension direction of the fuse portion, the projection of the break portion is at least partially located outside the adjacent fuse portion.

[0010] In some embodiments, the busbar further includes a base for connecting the connecting portion to the fuse portion and the disconnect portion respectively; the base has an extension portion extending toward and connecting to the disconnect portion; in a projection direction perpendicular to the extension direction of the fuse portion, the projection of the extension portion at least partially overlaps with the fuse portion; in the direction of the extension portion toward the disconnect portion, the width of the extension portion gradually decreases, and the distance between the extension portion and the fuse portion gradually increases.

[0011] In some embodiments, the busbar has a positioning hole for inserting a positioning post on the cell support, the positioning hole being located between the fuse portion and the disconnect portion.

[0012] In some embodiments, a support block for supporting the positioning post is provided on one side of the positioning hole, and the support block and the separation portion are located opposite each other on both sides of the positioning hole.

[0013] The present invention also provides a battery module, comprising: Cell support At least two battery cells are disposed within the battery cell support; The aforementioned busbar is mounted on the cell support, and the connecting part is electrically connected to the cell.

[0014] In some embodiments, a cutting block is provided on the battery cell bracket. When the busbar is assembled onto the battery cell bracket, the cutting block applies a mechanical force to the busbar to change the disconnection part from a connected state to a disconnected state.

[0015] In some embodiments, the cutting block is a wedge-shaped block perpendicular to the cell support, and when the busbar is assembled onto the cell support, the inclined surface of the cutting block faces the break-off portion.

[0016] In some embodiments, a positioning post protrudes from the cell support, and the cutting block is disposed on the positioning post.

[0017] In some embodiments, the cell support is provided with at least two hot-melt posts, and the busbar is formed with at least two mounting holes for inserting the hot-melt posts. When the busbar is installed on the cell support, the busbar is fixed on the cell support by the hot-melt posts.

[0018] At least one beneficial effect of the current bus and battery module provided by this invention is that: the current bus of this application, by setting a disconnecting part arranged parallel to the fuse part, is in a connected state before being installed onto the cell bracket, i.e., when the current bus is separated from the cell bracket. This allows the disconnecting part to bear the mechanical load when the current bus is subjected to unexpected bending forces during manufacturing, handling, assembly, etc., effectively preventing stress concentration on the fuse part and causing unexpected fracture, thereby improving the bending strength of the current bus. When it is installed onto the cell bracket, the disconnecting part changes from a connected state to a disconnected state. When the battery module is in use, the fuse part independently undertakes the overcurrent fusing function, thereby ensuring the fuse protection capability of the current bus. Therefore, this current bus can guarantee both the bending strength before installation and the fuse protection capability after installation.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are designated as the same elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a schematic diagram of the structure of a battery module according to an embodiment of this application; Figure 2 for Figure 1 Enlarged view of circle A in the middle; Figure 3 This is an exploded view of the battery module shown in one embodiment of this application; Figure 4 This is an exploded view of a portion of the structure of a battery module according to an embodiment of this application; Figure 5 for Figure 4 Enlarged view of circle B in the middle; Figure 6 This is a schematic diagram of the structure of a busbar according to an embodiment of this application; Figure 7 for Figure 6 A magnified view of circle C in the middle.

[0022] Reference numerals: 10, Cell bracket; 11, Upper cell bracket; 111, Upper pressure relief port; 12, Lower cell bracket; 121, Support platform; 122, Positioning groove; 123, Lower pressure relief port; 131, First side; 132, Second side; 14, Cutting block; 141, Inclined surface; 151, Positioning post; 152, Hot melt post; 16, Placement groove; 20, Cell; 21, Pressure relief channel; 22, Electrode; 30, Busbar; 31, Connecting part; 311, First connecting part; 312, Second connecting part; 313, Third connecting part 314. Fourth connecting part; 32. Fusible part; 33. Disconnecting part; 331. First disconnecting part; 332. Second disconnecting part; 34. Base; 34a. First base; 34b. Second base; 341. Extension part; 341a. First extension part; 341b. Second extension part; 351. Positioning hole; 352. Assembly hole; 36. Support block; 37. Groove; 40. Side busbar; 51. Main positive terminal; 52. Main negative terminal; 60. Battery acquisition board; 70. Battery management system. Detailed Implementation

[0023] The present invention will now be described in detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0024] It should be noted that, unless otherwise expressly specified and limited, the terms “transfer to,” “insert to,” “away from,” “extend,” “toward,” “insertion,” etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "installation," "fitting," "connection," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixing" can be bolted, clipped, or glued. 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 that feature. "A plurality" or "several" means two or more. In addition, "and / or" includes any and all combinations of one or more of the related listed items. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 A schematic diagram of the structure of a battery module according to an embodiment of this application is shown; Figure 2 It shows Figure 1 Enlarged view of the middle section structure; Figure 3 An exploded view of the battery module shown in one embodiment of this application is illustrated. Figure 4 An exploded view of a portion of the structure of a battery module according to an embodiment of this application is shown; Figure 5 It shows Figure 4 Enlarged view of the middle section structure; Figure 6 This diagram shows a structural schematic of a busbar 30 according to an embodiment of this application; Figure 7 It shows Figure 6 Enlarged view of the middle part of the structure.

[0027] Please see Figures 1 to 3An embodiment of this application shows a battery module including a cell support 10, a cell 20, a busbar 30, a side busbar 40, a main positive terminal 51, a main negative terminal 52, a battery acquisition board 60, and a battery management system 70. The cell support 10 includes an upper cell support 11 and a lower cell support 12 arranged opposite to each other. The cell 20 is disposed within the cell support 10 formed by the upper cell support 11 and the lower cell support 12. The upper cell support 11 has a cell positioning hole (not shown) matching the size of the cell 20. The lower cell support 12 has a support platform 121 for fixing the cell 20, and the support platform 121 surrounds a positioning groove 122 matching the cell 20. The number of cells 20 can be set according to actual needs; in this embodiment, the number of cells 20 is 16. A pressure relief channel 21 is formed between adjacent cells 20. Specifically, the pressure relief channel 21 is the gap formed between adjacent cells 20. The upper cell support 11 and the lower cell support 12 are provided with an upper pressure relief port 111 and a lower pressure relief port 123 corresponding to the pressure relief channel 21.

[0028] The busbar 30, side busbar 40, main positive terminal 51, main negative terminal 52, and battery acquisition board 60 are all mounted on the upper cell support 11. The tabs 22 of the cell 20 can be electrically connected to the busbar 30 by welding. The number of busbars 30 can be arranged according to the number of cells 20 to be connected and design requirements, with each busbar 30 electrically connecting at least two cells 20. In this embodiment, each busbar 30 electrically connects four cells 20; specifically, each busbar 30 has four connection parts 31 that are electrically connected one-to-one with each cell 20 (described in detail later). Several busbars 30 can be arranged in at least two rows. In this embodiment, the main positive terminal 51 and the main negative terminal 52 are located on the same side of the battery cell 20. Specifically, the battery cell support 10 has a first side 131 and a second side 132 opposite to the first side 131. The main positive terminal 51 and the main negative terminal 52 are located on the first side 131, and the side busbar 40 is located on the second side 132. The battery management system 70 is electrically connected to several busbars 30 and the corresponding side busbars 40 through the battery acquisition board 60 to acquire the voltage of the battery cell 20, and is also electrically connected to the main positive terminal 51 and the main negative terminal 52 to acquire the total voltage of the module. This battery management system 70 can adopt existing technology, which will not be described in detail here.

[0029] When this battery module is in use, if a single cell 20 experiences an internal short circuit, overcharge, or over-discharge, the faulty cell 20 will trigger a large current backflow in the parallel circuit, which will rapidly spread to the entire parallel group, causing thermal runaway of the module and potentially leading to fires, explosions, or other safety accidents. When the busbar 30 is welded to the tabs 22 of the cell 20, the connection area between the positive and negative tabs is prone to short circuits due to their close proximity, especially when the cells 20 are arranged in a honeycomb pattern. To address this issue, the busbar 30 in this embodiment integrates a fuse 32. This fuse 32 has a narrow cross-section structure and a set fusing current threshold. Thus, when the circuit current exceeds the threshold, the fuse 32 quickly melts and breaks, cutting off the circuit of the faulty cell 20 and preventing the spread of thermal runaway.

[0030] Please combine Figures 4 to 7 Specifically, the busbar 30 includes at least two connecting portions 31, at least one fusible portion 32, and at least one disconnecting portion 33. The connecting portions 31 are used to electrically connect to the battery cells 20 within the battery cell support 10, wherein each connecting portion 31 is soldered to the tab 22 of the battery cell 20.

[0031] The two ends of the fuse portion 32 are respectively connected to at least two connecting portions 31. For example, when a busbar 30 is connected to two battery cells 20 at the same time, one end of the fuse portion 32 is electrically connected to one of the battery cells 20 and the other end is electrically connected to the other battery cell 20. In this embodiment, when a busbar 30 is connected to four battery cells 20 at the same time, the number of connecting portions 31 of the busbar 30 is four. The connecting portions 31 are electrically connected to the battery cells 20 one-to-one. At this time, the two connecting portions 31 can form a group and then be connected through the fuse portion 32.

[0032] The disconnecting portions 33 are arranged side-by-side on at least one side of the fuse portion 32, and each disconnecting portion 33 is connected to at least two connecting portions 31 at both ends. There is a gap between the disconnecting portions 33 and the fuse portion 32 in the width direction, and their sides do not contact each other. The disconnecting portion 33 has a connected state and a disconnected state, wherein the disconnected state refers to the formation of a fracture on the disconnecting portion 33, and the disconnecting portion 33 is disconnected. When the busbar 30 is not installed on the cell support 10 (i.e., when the busbar 30 is separated from the cell support 10), the disconnecting portion 33 is in a connected state. Figure 6 (as shown in the diagram), and in this connected state, the disconnecting part 33 is configured to have the fusing part 32 bear the mechanical load; when the busbar 30 is assembled onto the cell support 10, the disconnecting part 33 changes from the connected state to the disconnected state (the disconnected state is as shown in the diagram). Figure 2 (The state shown).

[0033] It should be noted that in this embodiment, the disconnecting part 33 can be switched from a connected state to a disconnected state by the action of mechanical external force. Specifically, during assembly, when the busbar 30 is fixed to the cell support 10, the disconnecting part 33 breaks under the action of mechanical force, so as to switch from a connected state to a disconnected state. After it is in the disconnected state, the connecting part 31 can be welded to the cell 20.

[0034] To facilitate a clear understanding of the structure of the connecting part 31, the fuse part 32, and the disconnecting part 33, the following detailed explanation uses the busbar 30 connecting four battery cells 20 as an example. The busbar 30 is an integral sheet structure, which can be divided into a first base 34a, a second base 34b, a first connecting part 311, a second connecting part 312, a third connecting part 313, a fourth connecting part 314, a fuse part 32, and a disconnecting part 33. The first connecting part 311 and the second connecting part 312 are formed by bending outwards from both ends of the first base 34a, and the third connecting part 313 and the fourth connecting part 314 are formed by bending outwards from both ends of the second base 34b. One end of the fuse part 32 is connected to the first base 34a, and the other end is connected to the second base 34b. Similarly, one end of the disconnecting part 33 is connected to the first base 34a, and the other end is connected to the second base 34b. The first connecting part 311, the second connecting part 312, the third connecting part 313, and the fourth connecting part 314 are respectively electrically connected to the tabs 22 of the four battery cells 20. In detail... Figure 6 The direction of the presented bus 30 is Figure 3 When the middle busbar 30 is assembled to the view after the cell support 10 is flipped, the first connecting part 311 and the second connecting part 312 are respectively connected to the positive electrode of one cell 20 and the negative electrode of another cell 20 arranged adjacent to each other in the same row. The third connecting part 313 and the fourth connecting part 314 are respectively connected to the positive electrode of one cell 20 and the negative electrode of another cell 20 arranged adjacent to each other in the same row.

[0035] When the busbar 30 is assembled to the cell bracket 10 and the connecting part 31 is connected to the cell 20, the four cells 20 connected by one busbar 30 form a structure in which two cells 20 in the same row are connected in series and cells 20 in adjacent rows are connected in parallel.

[0036] The aforementioned busbar 30, by having a disconnecting part 33 arranged parallel to the fuse part 32, is in a connected state before being installed onto the cell support 10, i.e., when the busbar 30 is separated from the cell support 10. This allows the disconnecting part 33 to bear the mechanical load when the busbar 30 is subjected to unexpected bending forces during manufacturing, handling, assembly, etc., effectively preventing stress concentration on the fuse part 32 and thus avoiding unexpected breakage, thereby improving the bending strength of the busbar 30. When it is installed onto the cell support 10, the disconnecting part 33 is in a disconnected state. When the battery module is in use, the fuse part 32 independently performs the overcurrent fusing function, thereby ensuring the fuse protection capability of the busbar 30. Therefore, the busbar 30 can guarantee both the bending strength before installation and the fuse protection capability after installation.

[0037] In one alternative embodiment, the number of disconnecting portions 33 is N times the number of fusing portions 32, where N ≥ 2 and N is an integer. The disconnecting portions 33 and fusing portions 32 are spaced apart. Specifically, in a practical application, there may be one fusing portion 32 and two corresponding disconnecting portions 33, arranged side-by-side and opposite to each other on both sides of the fusing portion 32. This is equivalent to having a "reinforcing rib" on each side of the fusing portion 32, allowing the two disconnecting portions 33 to symmetrically bear the mechanical load, further improving the bending strength of the busbar 30. Of course, in specific applications, two or more fusing portions 32 can be provided as needed. Furthermore, the number of disconnecting portions 33 can be the same as the number of fusing portions 32. For example, if one fusing portion 32 is provided, one corresponding disconnecting portion 33 is also provided; or, if two or three fusing portions 32 are provided, two or three corresponding fusing portions 32 are provided. Moreover, the number of disconnecting portions 33 can also be less than the number of fusing portions 32; examples are not detailed here.

[0038] In some embodiments, the fusible portion 32 is along a first direction ( Figure 7 The first direction (indicated by the middle arrow a) is the extension direction of the slender segment of the fuse portion 32. When there are two or more break portions 33, the projections of the break portions 33 located on both sides of the same fuse portion 32 are staggered in the extension direction of the fuse portion 32 in the projection direction perpendicular to the extension direction of the fuse portion 32. In this "staggered arrangement", the projections of the two break portions 33 can be spaced apart or adjacent to each other. It should be noted that the staggered arrangement of the projections of the two break portions 33 can be staggered in terms of the thickness of the fuse portion 32 or in the extension direction of the fuse portion 32. In this embodiment, the projections of the two break portions 33 are staggered in the extension direction of the fuse portion 32. By adopting the above staggered arrangement, stress superposition on the same cross-section of the two break portions 33 is avoided, the local stress peak is reduced, and the bending resistance is further improved.

[0039] In an alternative embodiment, the fuse portion 32 has two ends in the extending direction. In the projection direction perpendicular to the extending direction of the fuse portion 32, the disconnecting portions 33 located on both sides of the fuse portion 32 are disposed near the ends. With this arrangement, in the length direction of the fuse portion 32, the disconnecting portions 33 are positioned near the two ends of the fuse portion 32, rather than near the middle of the fuse portion 32, to further increase the strength of the busbar 30.

[0040] In some alternative embodiments, in the projection direction perpendicular to the extension direction of the fuse portion 32, the projection of the disconnect portion 33 is at least partially located outside the adjacent fuse portion 32, thereby increasing the bending section modulus of the busbar 30 in the bending direction and thus improving the bending stiffness of the fuse portion 32. In a practical application, the fuse portion 32, as described above, is an elongated segment extending along the first direction, and the length of the disconnect portion 33 is much smaller than that of the fuse portion 32. In this embodiment, the total length of the two disconnect portions 33 is less than half the length of the fuse portion 32. Specifically, a first extension portion 341a is formed extending from the first base portion 34a toward the second base portion 34b, and the first disconnect portion 331 extends from the first extension portion 341a toward the second base portion 34b to connect. Similarly, a second extension portion 341b is formed extending from the second base portion 34b toward the first base portion 34a, and the second disconnect portion 332 extends from the second extension portion 341b toward the first base portion 34a to connect. Of course, in a preferred embodiment, the projection of the break portion 33 can be located entirely outside the adjacent fuse portion 32.

[0041] In an alternative embodiment, as described above, the busbar 30 further includes a base 34 for connecting the connecting portion 31 to the fusible portion 32 and the disconnecting portion 33, respectively. The base 34 has an extension 341 extending toward and connecting to the disconnecting portion 33. In the projection direction perpendicular to the extension direction of the fusible portion 32, the projection of the extension 341 at least partially overlaps with the fusible portion 32. In this embodiment, the projections of the first extension 341a and the second extension 341b are entirely within the projection of the fusible portion 32, in which case the length of the first extension 341a and the second extension 341b in the longitudinal direction is less than the length of the fusible portion 32; in another embodiment, the projections of the first extension 341a and the second extension 341b are only partially within the projection of the fusible portion 32, in which case the projection of the disconnecting portion 33 may be located outside the fusible portion 32. In the direction from the extension 341 toward the break portion 33, the width of the extension 341 gradually decreases, and the distance between the extension 341 and the fuse portion 32 gradually increases. In this design, because the width of the extension 341 gradually decreases, the strength of the busbar 30 can be further increased by the extension 341, thus improving its bending resistance. Furthermore, the thickness of the extension 341 can be greater than the thickness of the break portion 33, thereby ensuring bending resistance while also facilitating the break portion 33 to disconnect under mechanical force.

[0042] As described above, in this embodiment, when the disconnecting part 33 is in the disconnected state, the disconnecting part 33 is disconnected, and in the disconnected state, the disconnecting part 33 still remains on the busbar 30. The purpose of this design is that since the busbar 30 is made of conductive material as a whole, if the disconnecting part 33 is disconnected from other parts of the busbar 30 when it is in the disconnected state, that is, separated / removed from the busbar 30, it may cause the disconnecting part 33 to scatter inside the hot melt machine or inside the battery module, thereby causing short circuits or other problems inside the hot melt machine or the battery module.

[0043] In an alternative embodiment, to facilitate simultaneous cutting of the disconnection portion 33 during assembly to place it in a disconnected state, a cutting block 14 is provided on the upper cell support 11. When the busbar 30 is assembled onto the upper cell support 11, the cutting block 14 applies a mechanical force to the busbar 30 to change the disconnection portion 33 from a connected state to a disconnected state. Specifically, the cutting block 14 is a wedge-shaped block perpendicular to the upper cell support 11. When the busbar 30 is assembled onto the upper cell support 11, the inclined surface 141 of the cutting block 14 faces the disconnection portion 33. After the external force is applied to the busbar 30, it pushes the busbar 30 towards the upper cell support 11, and the disconnection portion 33 gradually approaches the inclined surface 141 of the cutting block 14 until the two come into contact. When the busbar 30 is pushed to continue moving upward toward the cell support 11, the widths of the first disconnection portion 331 and the second disconnection portion 332 are smaller than the widths of the first base 34a and the second base 34b, and their thicknesses are also smaller than those of the first base 34a and the second base 34b. Therefore, the first disconnection portion 331 and the second disconnection portion 332 are relatively weak under stress. When the reaction force (i.e., the compressive force) of the cutting block 14 relative to the disconnection portion 33 exceeds the stress range of the disconnection portion 33, the disconnection portion 33 will break. In practical applications, to facilitate disconnection, the width and thickness of the first disconnection portion 331 and the second disconnection portion 332 should be as narrow and thin as possible, provided that the mechanical support strength of the first disconnection portion 331 and the second disconnection portion 332 is sufficient in the connected state.

[0044] In some alternative embodiments, a positioning post 151 protrudes from the upper battery cell bracket 11, and a positioning hole 351 is formed on the busbar for inserting the positioning post 151. The positioning hole 351 is located between the fuse portion 32 and the disconnect portion 33. Through the cooperation of the positioning post 151 and the positioning hole 351, displacement deviation can be avoided during the installation of the busbar 30, which would cause misalignment between the cutting block 14 and the disconnect portion 33. Based on the above embodiments, the cutting block 14 can optionally be disposed on the positioning post 151. By disposing of the cutting block 14 on the positioning post 151, the compactness of the overall structure can be improved. More importantly, when the cutting block 14 applies force to the disconnect portion 33, the positioning post 151 can provide stable reverse support for the cutting block 14, thereby ensuring the mechanical force of the cutting block 14 relative to the disconnect portion 33.

[0045] In this embodiment, a support block 36 for supporting the positioning post 151 is provided on one side of the positioning hole 351. The support block 36 and the fuse portion 32 are located on both sides of the positioning hole 351. Specifically, the support block 36 extends from the base 34 into the separation space (not labeled) between the fuse portion 32 and the separation portion 33. The support block 36 limits the positioning post 151, preventing displacement of the positioning post 151 during the insertion process with the positioning hole 351. A groove 37 is also formed between the support block 36 and the fuse portion 32. The size of the fuse portion 32 can be increased through the groove 37. Therefore, the synergistic effect of the support block 36 and the groove 37 allows the fuse portion 32 to be customized according to the product power and module rated current, increasing design flexibility.

[0046] In some alternative embodiments, in order to further position the busbar 30, a mounting groove 16 is provided on the upper battery cell bracket 11 at the position corresponding to the connecting part 31. When the busbar 30 is fixed to the positioning hole 351 and the busbar 30 is in a disconnected state, the connecting part 31 is located in the mounting groove 16.

[0047] In some alternative embodiments, to ensure the busbar 30 remains stable after being installed on the upper cell bracket 11, and to strengthen and protect the busbar 30 when the battery module is subjected to impacts such as vibration or drops, thereby improving the overall strength and reliability of the module, a hot-melt post 152 can be used to fix the busbar 30. Specifically, the battery module also includes a hot-melt post 152, which extends upward from the upper cell bracket 11. There are at least two hot-melt posts 152 to ensure that the busbar 30 can be securely fixed to the upper cell bracket 11. Correspondingly, the busbar 30 has mounting holes 352 for inserting the hot-melt posts 152. In this embodiment, the two mounting holes 352 are respectively opened on the first base 34a and the second base 34b. By providing a heat-fusion post 152 on the upper cell support 11 and an assembly hole 352 for inserting the heat-fusion post 152 on the busbar 30, the busbar 30 is securely fixed to the cell support 10 under the action of the heat-fusion post 152 when it is installed on the upper cell support 11. This prevents the busbar 30 from unexpectedly breaking when subjected to impacts such as vibration or drops, ensuring the reliability of the busbar 30. In other embodiments, the number of heat-fusion posts 152 and assembly holes 352 can also be set according to actual needs, and no specific limitation is made here.

[0048] To facilitate understanding of the transition of the disconnection section 33 from the connected state to the disconnected state, the assembly method of the battery module in one embodiment of this application will be described in detail below.

[0049] S100: Place the upper battery cell bracket 11 on the hot-melt fixture (not shown), and place the busbar 30 in the corresponding position on the upper battery cell bracket 11. Specifically, the positioning hole 351 and assembly hole 352 of the busbar 30 are placed on the corresponding positioning post 151 and hot-melt post 152. It should be noted that at this time, the busbar 30 has not yet been installed on the upper battery cell bracket 11. The busbar 30 is in a connected state, that is, the disconnecting part 33 has not been disconnected, the positioning post 151 and hot-melt post 152 are fully inserted into the corresponding positioning hole 351 and assembly hole 352, and the connecting part 31 has not entered the placement groove 16. S200: The pressing block on the hot melt machine presses against the busbar 30, pushing the busbar 30 to move towards the upper battery cell bracket 11. The positioning post 151 and the hot melt post 152 are gradually inserted into the positioning hole 351 and the assembly hole 352. The disconnecting part 33 is broken under the pressure of the cutting block 14, that is, the disconnecting part 33 changes from the connected state to the disconnected state until the positioning post 151 and the hot melt post 152 are finally inserted into the positioning hole 351 and the assembly hole 352, and the connecting part 31 is placed in the placement groove 16. At the same time, the hot melt post 152 is hot melted, so that the busbar 30 is fixed on the upper battery cell bracket 11. S300: The side busbar 40, the main positive terminal 51, and the main negative terminal 52 are fixed to the upper battery cell bracket 11 by a hot melt machine. Similarly, the side busbar 40, the main positive terminal 51, and the main negative terminal 52 are also provided with hot melt holes (unlabeled). Corresponding hot melt pillars (unlabeled) are formed on the upper battery cell bracket 11. The side busbar 40, the main positive terminal 51, and the main negative terminal 52 are connected to the hot melt holes through the hot melt pillars and after the hot melt pillars are hot melted, they are fixed to the upper battery cell bracket 11. S400: Fix the battery acquisition board 60 to the upper cell bracket 11, and weld the battery acquisition board 60 to each busbar 30, side busbar 40, main positive terminal 51 and main negative terminal 52 in sequence to achieve electrical connection; S500: Place the lower cell support 12 on the workbench and place several cells 20 into the corresponding positioning slots 122 in sequence; S600: Place the upper cell bracket 11 completed in step S300 onto the cell 20 in step S500, and fix the upper cell bracket 11 and the lower cell bracket 12 with screws.

[0050] S700: The busbar 30, the side busbar 40, the main positive terminal 51 and the main negative terminal 52 are all welded to the corresponding tabs 22 of the battery cell 20 to achieve electrical connection. S800: The battery management system 70 is fixed to the upper cell bracket 11 and the lower cell bracket 12 with screws.

[0051] As can be seen from the above battery module assembly method, the busbar 30 is in a connected state before being assembled to the cell bracket 10. When it is installed on the cell bracket 10, it is broken by the extrusion of the cutting block 14, thus changing from a connected state to a disconnected state. Therefore, the cutting of the busbar 30 and its fixing to the cell bracket 10 occur synchronously. Therefore, there is no need to take additional steps to break the busbar 30 before, during, or after it is assembled to the cell bracket 10. Thus, the cooperation between the busbar 30 and the cutting block 14 can also reduce assembly time and simplify the assembly process.

[0052] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention, but it should not be construed as limiting the specific implementation of the invention to these descriptions. Those skilled in the art will recognize that various modifications and improvements can be made without departing from the concept of the present invention, and all such modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A busbar, characterized in that, include: At least two connecting parts are provided for electrical connection to the battery cells on the battery cell support, respectively. At least one fusible link, and the two ends of each fusible link are respectively connected to at least two connecting links; At least one disconnecting part is arranged side by side on at least one side of the fusible part. In the width direction of the fusible part, there is a gap between the disconnecting part and the fusible part, and their sides do not contact each other. The two ends of each disconnecting part are respectively connected to at least two connecting parts. The disconnecting part has a connected state and a disconnected state; when the busbar is separated from the cell support, the disconnecting part is in a connected state, and in the connected state, the disconnecting part is configured to bear the mechanical load for the fuse part; when the busbar is assembled onto the cell support, the disconnecting part changes from the connected state to the disconnected state.

2. The busbar as described in claim 1, characterized in that, The number of the break-off parts is N times the number of the fuse-off parts, where N≥2, and the break-off parts and fuse-off parts are arranged at intervals.

3. The busbar as described in claim 2, characterized in that, In the projection direction perpendicular to the extension direction of the fuse portion, the projections of the deflection portions located on both sides of the same fuse portion are staggered in the extension direction of the fuse portion.

4. The busbar as described in claim 3, characterized in that, The fusible portion has two ends in the extending direction; in the projection direction perpendicular to the extending direction of the fusible portion, the projections of the separation portions located on both sides of the fusible portion are positioned close to the ends.

5. The busbar as described in claim 4, characterized in that, In the projection direction perpendicular to the extension direction of the fuse portion, the projection of the break portion is at least partially located outside the adjacent fuse portion.

6. The busbar as described in any one of claims 2-5, characterized in that, The busbar further includes a base for connecting the connecting portion to the fuse portion and the disconnect portion respectively; the base has an extension portion extending toward and connecting to the disconnect portion; in a projection direction perpendicular to the extension direction of the fuse portion, the projection of the extension portion at least partially overlaps with the fuse portion; in the direction of the extension portion toward the disconnect portion, the width of the extension portion gradually decreases, and the distance between the extension portion and the fuse portion gradually increases.

7. The busbar as described in claim 1, characterized in that, The busbar has a positioning hole for inserting a positioning post on the battery cell bracket, the positioning hole being located between the fuse portion and the disconnect portion.

8. The busbar as described in claim 7, characterized in that, A support block for supporting the positioning post is provided on one side of the positioning hole, and the support block and the separation part are located on opposite sides of the positioning hole.

9. A battery module, characterized in that, include: Cell support At least two battery cells are mounted on the battery cell support. The busbar as described in any one of claims 1 to 8, wherein the busbar is mounted on the cell support and the connecting portion is electrically connected to the cell.

10. The battery module as described in claim 9, characterized in that, The battery cell support is provided with a cutting block. When the busbar is assembled onto the battery cell support, the cutting block applies a mechanical force to the busbar to change the disconnection part from a connected state to a disconnection state.

11. The battery module as described in claim 10, characterized in that, The cutting block is a wedge-shaped block perpendicular to the cell support, and when the busbar is assembled onto the cell support, the inclined surface of the cutting block faces the break-off portion.

12. The battery module as described in claim 10, characterized in that, A positioning post is protruding from the battery cell bracket, and the cutting block is disposed on the positioning post.

13. The battery module as described in claim 9, characterized in that, The battery cell support is provided with at least two hot-melt posts, and the busbar is formed with at least two assembly holes for inserting the hot-melt posts. When the busbar is installed on the battery cell support, the busbar is fixed on the battery cell support under the action of the hot-melt posts.

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