Bus bar assembly and battery module having the same

Abstract

The present invention provides a bus bar assembly and a battery module having the same. Among them, the bus bar assembly is used for a battery module. The bus bar assembly includes a first bus bar. The first bus bar includes: a bus bar body, which includes a first row body and a second row body. The first row body is electrically connected to the positive electrode of one battery cell, and the second row body is electrically connected to the negative electrode of another battery cell. The two battery cells are arranged adjacent to each other along a first preset direction S1; there are multiple bus bar bodies, and the multiple bus bar bodies are arranged at intervals along a second preset direction S2; multiple connecting parts, each connecting part is used to connect two adjacent bus bar bodies; wherein, the following relationship is satisfied between the width m of the first row body and the width n of the connecting part: 3n ≤ m ≤ 12n, and a first included angle is provided between the first preset direction S1 and the second preset direction S2. The present invention effectively solves the problem of poor electrical connection effectiveness between large-capacity battery cells in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and more particularly, to a busbar assembly and a battery module having the same. Background Art

[0002] At present, the cylindrical battery cells of battery modules are gradually evolving from small-capacity cylinders to large-capacity cylinders (such as 46800 cylindrical battery cells or 46950 cylindrical battery cells, etc.). For example, the current research and development focus of many battery factories on cylinders is in the direction of large cylinders. Among them, because the large-capacity cylinders have a higher capacity (the capacity is above 20 Ah) and a higher charge and discharge rate (the discharge rate is above 2C), the requirements for electrical connectors are more stringent.

[0003] However, for the electrical connection scheme of large-diameter and large-capacity battery cells, the prior art cannot effectively connect large-capacity battery cells, which affects the performance of the power characteristics of the battery module. Summary of the Invention

[0004] The main object of the present invention is to provide a busbar assembly and a battery module having the same, so as to solve the problem of poor effectiveness of electrical connection between large-capacity battery cells in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a busbar assembly for a battery module. The busbar assembly includes a first busbar, and the first busbar includes: a busbar body including a first body and a second body, the first body is electrically connected to the positive electrode of one battery cell, the second body is electrically connected to the negative electrode of another battery cell, and the two battery cells are arranged adjacent to each other along a first preset direction S1; there are a plurality of busbar bodies, and the plurality of busbar bodies are arranged at intervals along a second preset direction S2; a plurality of connecting parts, each connecting part is used to connect two adjacent busbar bodies; wherein, the width m of the first body and the width n of the connecting part satisfy the following relationship: 3n ≤ m ≤ 12n, and the first preset direction S1 and the second preset direction S2 are arranged at a first included angle.

[0006] Further, a narrow fuse structure is provided on each connecting part. When the current flowing through the connecting part is greater than a preset current value, the narrow fuse structure generates heat to fuse the connecting part.

[0007] Further, the first busbar is an integrally formed structure.

[0008] Further, the plate thickness of the busbar body is greater than or equal to 0.5 mm and less than or equal to 2.0 mm; and / or, each connecting part is in a plate shape, and the plate thickness of the connecting part is greater than or equal to 0.5 mm and less than or equal to 2.0 mm.

[0009] Further, the first row body is connected to the positive electrode of the battery cell by laser welding; and / or, the second row body is connected to the negative electrode of the battery cell by laser welding.

[0010] Further, each connecting portion connects the second row bodies of two adjacent busbar bodies.

[0011] Further, the positive electrode is cylindrical or annular. The outer peripheral surface of the first row body includes a first plane, an arc surface, and a second plane. The first plane and the second plane are arranged parallel to each other, and the arc surface is coaxially arranged with the positive electrode. Wherein, the distance between the first plane and the second plane is the width m of the first row body.

[0012] Further, the connecting line L between the central axes of the arc surfaces of two adjacent busbar bodies forms a second included angle with the second preset direction S2.

[0013] Further, the connecting line L between the central axes of the arc surfaces of two adjacent busbar bodies is arranged parallel to the second preset direction S2.

[0014] Further, the second row body is fan-shaped, and at least one of the plurality of second row bodies has an avoidance recess on the surface facing the positive electrode, and the avoidance recess is used to avoid the positive electrode.

[0015] Further, the second row body is a first strip plate, the width of the first strip plate is the same as the width of the first row body, and the surface of the second row body facing the positive electrode has an avoidance recess for avoiding the positive electrode.

[0016] Further, the connecting portion is a second strip plate, and the second strip plate is arc-shaped; or, the second strip plate is linear.

[0017] Further, the connecting portion is a second strip plate, and the second strip plate forms a third included angle A with the first strip plate, and the third included angle A is greater than or equal to 45° and less than or equal to 90°.

[0018] Further, the busbar assembly further includes: a second busbar, including a first busbar body, a first tab welding portion, and a second tab welding portion. The first tab welding portion and the second tab welding portion are both arranged on the first busbar body, and the first tab welding portion and / or the second tab welding portion are connected to the negative electrode.

[0019] Further, the busbar assembly further includes: a third busbar, including a second busbar body, a third tab welding portion, and a fourth tab welding portion. The third tab welding portion and the fourth tab welding portion are both arranged on the second busbar body, and the third tab welding portion and / or the fourth tab welding portion are connected to the positive electrode.

[0020] According to another aspect of the present invention, a battery module is provided, which includes battery cells and a bus bar assembly. The bus bar assembly is connected to the battery cells; wherein, the bus bar assembly is the above-mentioned bus bar assembly.

[0021] Applying the technical solution of the present invention, the first bus bar includes a plurality of bus bar bodies. The first row body of each bus bar body is electrically connected to the positive electrode of one battery cell, and the second row body of each bus bar body is electrically connected to the negative electrode of another battery cell, and the two battery cells are arranged adjacent to each other. The adjacent two bus bar bodies are connected by a connecting portion. In this way, since the following relationship is satisfied between the width m of the first row body and the width n of the connecting portion: 3n ≤ m ≤ 12n, the contact area between the first row body and the positive electrode is increased, and the connection strength and connection stability between the first row body and the positive electrode are improved, so as to ensure that the first bus bar can be electrically connected to large-diameter and large-capacity battery cells, and prevent the first bus bar from being separated from the battery cells, which affects the electrical connection effectiveness between the adjacent two battery cells by the first bus bar. Furthermore, the problem of poor electrical connection effectiveness between large-capacity battery cells in the prior art is solved, and the electrical connection effectiveness between the battery cells by the bus bar assembly is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 FIG. 12 shows a schematic structural diagram of Embodiment 1 of the bus bar assembly according to the present invention;

[0024] Figure 2 FIG. 16 shows Figure 1 an enlarged schematic view of part B of the bus bar assembly in FIG. 16;

[0025] Figure 3 FIG. 22 shows a schematic structural diagram of Embodiment 2 of the bus bar assembly according to the present invention;

[0026] Figure 4 FIG. 26 shows a schematic structural diagram of the first bus bar of Embodiment 3 of the bus bar assembly according to the present invention;

[0027] Figure 5 FIG. 30 shows a schematic structural diagram of Embodiment 4 of the bus bar assembly according to the present invention;

[0028] Figure 6 FIG. 34 shows Figure 5 a schematic structural diagram of the first bus bar of the bus bar assembly in FIG. 34;

[0029] Figure 7 FIG. 40 shows a schematic structural diagram of Embodiment 5 of the bus bar assembly according to the present invention;

[0030] Figure 8 shows Figure 7 a schematic structural diagram of a first busbar of the busbar assembly in

[0031] Figure 9 shows a schematic structural diagram of a first busbar of Embodiment VI of the busbar assembly according to the present invention;

[0032] Figure 10 shows a schematic structural diagram of Embodiment VII of the busbar assembly according to the present invention; and

[0033] Figure 11 shows Figure 10 a schematic structural diagram of a first busbar of the busbar assembly in

[0034] Among them, the above-mentioned drawings include the following reference numerals:

[0035] 10, first busbar; 11, busbar body; 111, first row body; 1111, first plane; 1112, arc surface; 1113, second plane; 112, second row body; 1121, avoidance recess; 12, connecting part; 20, battery cell; 21, positive electrode; 22, negative electrode; 30, second busbar; 31, first busbar body; 32, first tab welding part; 33, second tab welding part; 40, third busbar; 41, second busbar body; 42, third tab welding part; 43, fourth tab welding part; 50, low-voltage acquisition line; 60, sampling tab; 70, positioning hole. Detailed Embodiments

[0036] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0037] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0038] In the present invention, unless otherwise stated, the orientation terms such as "upper, lower" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction; similarly, for ease of understanding and description, "left, right" are usually in the left and right shown in the drawings; "inside, outside" refer to the inside and outside of the contour of each component itself, but the above orientation terms do not limit the present invention.

[0039] In order to solve the problem of poor electrical connection effectiveness between large-capacity battery cells in the prior art, the present application provides a busbar assembly and a battery module having the same.

[0040] Embodiment I

[0041] As Figure 1 and Figure 2 shown, the bus bar assembly is used for the battery module. The bus bar assembly includes a first bus bar 10, and the first bus bar 10 includes a bus bar body 11 and a plurality of connecting parts 12. The bus bar body 11 includes a first row body 111 and a second row body 112. The first row body 111 is electrically connected to the positive electrode 21 of a battery cell 20, and the second row body 112 is electrically connected to the negative electrode 22 of another battery cell 20. The two battery cells 20 are arranged adjacent to each other along a first preset direction S1. There are a plurality of bus bar bodies 11, and the plurality of bus bar bodies 11 are arranged at intervals along a second preset direction S2. Each connecting part 12 is used to connect two adjacent bus bar bodies 11. Wherein, the following relationship is satisfied between the width m of the first row body 111 and the width n of the connecting part 12: 3n ≤ m ≤ 12n, and a first included angle is formed between the first preset direction S1 and the second preset direction S2.

[0042] Applying the technical solution of this embodiment, the first bus bar 10 includes a plurality of bus bar bodies 11. The first row body 111 of each bus bar body 11 is electrically connected to the positive electrode 21 of a battery cell 20, and the second row body 112 of each bus bar body 11 is electrically connected to the negative electrode 22 of another battery cell 20, and the two battery cells 20 are arranged adjacent to each other. Two adjacent bus bar bodies 11 are connected by a connecting part 12. In this way, since the following relationship is satisfied between the width m of the first row body 111 and the width n of the connecting part 12: 3n ≤ m ≤ 12n, the contact area between the first row body 111 and the positive electrode 21 is increased, and the connection strength and connection stability between the first row body 111 and the positive electrode 21 are improved, so as to ensure that the first bus bar 10 can be electrically connected to large-diameter and large-capacity battery cells 20, and prevent the first bus bar 10 from being separated from the battery cell 20, which affects the electrical connection effectiveness between two adjacent battery cells 20 by the first bus bar 10. Furthermore, the problem of poor electrical connection effectiveness between large-capacity battery cells in the prior art is solved, and the electrical connection effectiveness between battery cells by the bus bar assembly is improved.

[0043] In this embodiment, in the overall layout of the bus bar, S1 is the longitudinal direction of the battery module and also the direction of the current of the battery module, and the S2 direction is the transverse direction of the battery module and also the overall direction between the parallel connections of the battery cells of the bus bar of the battery module.

[0044] In this embodiment, since the width m of the first row body 111 is much larger than the width n of the connecting part 12, the current-carrying cross-section between the series-connected battery cells in the battery module is much larger than the current-carrying cross-section between the parallel-connected battery cells. At the same time, the above setting solidifies the current path between single battery cells, so that the current paths of each battery cell branch do not cross. The third busbar 40 (total positive busbar) and the second busbar 30 (total negative busbar) are arranged in the S1 direction and have a large cross-section design. Under the condition of the same current-carrying cross-section, the overall design thickness of the busbar assembly in this embodiment is the thinnest and the cost is more optimal.

[0045] In this embodiment, the busbar assembly is arranged on the positive electrode side of the battery cell 20, that is, a single-sided welding method is adopted between the busbar assembly and the battery cell 20, which is convenient for arranging a cooling device on the negative electrode side of the battery cell 20 or using the negative electrode side of the battery cell 20 as the bonding surface, which is convenient for the integrated design of cell CTP (cell to pack) and CTC (cell to chassis).

[0046] Optionally, if the rated capacity of the cylindrical battery cell is 30 Ah, the battery system requires 2C charging, and a 1 mm aluminum bar (including the insulating coating) design is adopted, the value of m is not less than 16 mm, and the recommended value of the narrow position n is 1.33 - 5.33 mm.

[0047] Optionally, the busbar assembly is connected to a PCB board or an FPC board to form a CCS component (cell contacting system) for the current collection and low-voltage acquisition of large-capacity cylinders. In this way, the above setting cancels the traditional split low-voltage wire harness acquisition and high-voltage connectors, and integrates them into one component, which can also be used as a part of the battery cell grouping component, thereby reducing the process steps and costs. After the CCS component and the battery cells are grouped, due to the reduction in the use of wire harnesses and the effective avoidance of wire harness crossing, the electrical safety is higher, thus reducing the failure risk caused by electrical connector failures.

[0048] Specifically, the CCS component has a preset stiffness, which needs to meet the usage requirements of the battery module. After the CCS component is welded to the battery cell 20, this component serves as a bracket for the positive electrode of the battery cell and can also be used as a part of the battery cell grouping framework. At the same time, the CCS component can be used as a welding fixture during the battery cell welding process.

[0049] Optionally, the CCS component encapsulates the busbar component for series-parallel connection and busbar output and the low-voltage acquisition line in an insulating resin plate or inlays them in a plastic bracket. If this component is inlaid in the bracket, structural adhesive is required to integrate it into a component. In this way, the CCS component is used for high-voltage electrical connection and low-voltage acquisition of large-capacity cylinders. The CCS component adopts an integrated design, integrating the high- and low-voltage sampling units into one piece, and encapsulating them as a whole through resin to reduce the assembly process, which can effectively reduce the cost for the grouping of this battery cell.

[0050] In this embodiment, functional holes (such as glue injection holes, positioning holes, and mounting holes) are provided on the first busbar 10. For example, some glue injection holes are reserved to facilitate glue injection after the battery cells are grouped. The functional holes can also be used as mounting holes or clamping holes for the insulating cover.

[0051] Optionally, positioning pins are provided on the CCS component to limit the position of the battery cell 20.

[0052] In this embodiment, the first included angle is 90°, and multiple battery cells 20 are distributed in a diamond shape.

[0053] In this embodiment, the parallel connection direction of the battery cells 20 is parallel to the first busbar 10 or has a general layout trend that is consistent. It is necessary to ensure that the high-voltage busbar is on one side of the first busbar 10 connected in series, and the low-voltage sampling is on the other side. Adopting this layout can achieve a high- and low-voltage separation layout to ensure that the busbar side has the largest busbar cross-section.

[0054] In this embodiment, a narrow-position fuse structure is provided on each connecting part 12. When the current flowing through the connecting part 12 is greater than the preset current value, the narrow-position fuse structure generates heat to fuse the connecting part 12. In this way, if a certain battery cell 20 fails due to other abnormal factors such as liquid leakage or over-discharge of a single battery cell 20, and this battery cell 20 causes overload balancing due to reverse charging, the connecting part 12 will fuse, avoiding secondary disasters or thermal runaway.

[0055] Specifically, the narrow-position fuse structure is arranged at a fourth included angle with the extending direction of each connecting part 12 to ensure that the narrow-position fuse structure can fuse the connecting part 12, improving the fusing reliability of the narrow-position fuse structure.

[0056] In this embodiment, the first busbar 10 is an integrally formed structure. In this way, the above settings not only improve the structural strength of the first busbar 10, extend the service life of the first busbar 10, but also make the processing of the first busbar 10 easier and simpler, reducing the processing cost and processing difficulty of the busbar component.

[0057] Optionally, the plate thickness of the busbar body 11 is greater than or equal to 0.5 mm and less than or equal to 2.0 mm. In this way, the above setting not only ensures that the first busbar 10 can carry current normally so that all the battery cells 20 can operate normally, but also makes the structure of the busbar body 11 simpler, easier to process and implement. At the same time, the above setting realizes the miniaturized design of the busbar assembly, thereby reducing the overall occupied space of the battery module.

[0058] In this embodiment, the plate thickness of the busbar body 11 is 1.0 mm. It should be noted that the value of the plate thickness of the busbar body 11 is not limited to this and can be adjusted according to the working conditions and usage requirements. Optionally, the plate thickness of the busbar body 11 is 0.8 mm, or 1.2 mm, or 1.5 mm, or 1.6 mm, or 1.8 mm.

[0059] Optionally, each connecting part 12 is in a plate shape, and the plate thickness of the connecting part 12 is greater than or equal to 0.5 mm and less than or equal to 2.0 mm. In this way, the above setting not only ensures that two adjacent busbar bodies 11 can be electrically connected so that the FPC board can sample multiple battery cells 20, but also makes the structure of the busbar body 11 simpler, easier to process and implement. At the same time, the above setting realizes the miniaturized design of the busbar assembly, thereby reducing the overall occupied space of the battery module.

[0060] In this embodiment, the plate thickness of the connecting part 12 is the same as that of the busbar body 11.

[0061] In this embodiment, the first row body 111 and the positive electrode 21 of the battery cell 20 are connected by laser welding. In this way, the above setting improves the connection strength between the first row body 111 and the positive electrode 21, and further improves the electrical connection effectiveness between the battery cells of the busbar assembly to ensure that the battery module can operate normally.

[0062] In this embodiment, the second row body 112 and the negative electrode 22 of the battery cell 20 are connected by laser welding. In this way, the above setting improves the connection strength between the second row body 112 and the negative electrode 22, and further improves the electrical connection effectiveness between the battery cells of the busbar assembly to ensure that the battery module can operate normally.

[0063] In this embodiment, each connecting part 12 connects the second row bodies 112 of two adjacent busbar bodies 11. In this way, the above setting makes the structure of the first busbar 10 simpler, easier to process and implement, and reduces the processing cost and difficulty of the busbar assembly.

[0064] Such as Figure 2As shown, the positive electrode 21 is cylindrical or annular. The outer peripheral surface of the first row body 111 includes a first plane 1111, an arc surface 1112, and a second plane 1113. The first plane 1111 and the second plane 1113 are arranged parallel to each other, and the arc surface 1112 is coaxially arranged with the positive electrode 21. Among them, the distance between the first plane 1111 and the second plane 1113 is the width m of the first row body 111.

[0065] As Figure 1 shown, the connecting line L between the central axes of the arc surfaces 1112 of two adjacent bus bar bodies 11 forms a second included angle with the second preset direction S2. Specifically, a plurality of battery cells 20 are arranged in a diamond layout (staggered arrangement). The above setting of the first bus bar 10 ensures that the first bus bar 10 can be electrically connected to the battery cells 20, improving the electrical connection reliability between the two.

[0066] As Figure 1 shown, the second row body 112 is fan-shaped. At least one of the plurality of second row bodies 112 has an avoidance recess 1121 on the surface facing the positive electrode 21, and the avoidance recess 1121 is used to avoid the positive electrode 21. In this way, the above setting not only increases the contact area between the second row body 112 and the negative electrode 22, thereby improving the electrical connection reliability of the bus bar assembly. At the same time, the above setting can prevent the second row body 112 from being connected to the positive electrode 21 and affecting the normal operation of the battery cells 20. At the same time, the above setting makes the structure of the second row body 112 simpler, easier to process and implement, and reduces the processing cost of the bus bar assembly.

[0067] As Figure 1 shown, the bus bar assembly further includes a second bus bar 30. Among them, the second bus bar 30 includes a first bus bar body 31, a first tab welding part 32, and a second tab welding part 33. The first tab welding part 32 and the second tab welding part 33 are both arranged on the first bus bar body 31, and the first tab welding part 32 and / or the second tab welding part 33 are connected to the negative electrode 22.

[0068] As Figure 1 shown, the bus bar assembly further includes a third bus bar 40. Among them, the third bus bar 40 includes a second bus bar body 41, a third tab welding part 42, and a fourth tab welding part 43. The third tab welding part 42 and the fourth tab welding part 43 are both arranged on the second bus bar body 41, and the third tab welding part 42 and / or the fourth tab welding part 43 are connected to the positive electrode 21.

[0069] In this embodiment, a positioning hole 70 is provided on the first bus bar 10, and the positioning hole 70 is in limit fit with the positioning convex part on the battery cell bracket to achieve the positioning between the first bus bar 10 and the battery cell bracket.

[0070] As Figure 1As shown, there are multiple first busbars 10, each first busbar 10 extends along the second preset direction S2, and each first busbar 10 further includes a sampling tab 60. The busbar assembly further includes a low-voltage acquisition line 50, and each low-voltage acquisition line is connected to the sampling tab 60 of each first busbar 10.

[0071] Optionally, the first row body 111 and the positive electrode 21 are welded using an annular solder joint layout to ensure the welding strength between the two. In this embodiment, the positive electrode welding area is semi-circular, with a circular welding area or an annular welding area reserved.

[0072] It should be noted that the solder joint layout is not limited to this and can be adjusted according to the working conditions and usage requirements. Optionally, the solder joint layout is strip-shaped, star-shaped, or other shapes.

[0073] It should be noted that the welding method between the first row body 111 and the positive electrode 21 is not limited to this and can be adjusted according to the working conditions and usage requirements. Optionally, resistance welding or bonding welding is used between the first row body 111 and the positive electrode 21.

[0074] It should be noted that the welding between the first row body 111 and the positive electrode 21, and between the second row body 112 and the negative electrode 22 needs to meet the current-carrying requirements of the battery cell 20.

[0075] Optionally, the second row body 112 and the negative electrode 22 are welded using an annular solder joint layout to ensure the welding strength between the two.

[0076] It should be noted that the welding method between the second row body 112 and the negative electrode 22 is not limited to this and can be adjusted according to the working conditions and usage requirements. Optionally, resistance welding or bonding welding is used between the second row body 112 and the negative electrode 22.

[0077] Optionally, the first busbar 10 is made of 1-series aluminum, or pure copper, or copper-aluminum composite material, so that the material selection of the first busbar 10 is more flexible to meet different usage requirements and working conditions, and also improves the processing flexibility of the staff.

[0078] As Figure 1 shown, the present application also provides a battery module, including a battery cell 20 and a busbar assembly, and the busbar assembly is connected to the battery cell 20. Among them, the busbar assembly is the above-mentioned busbar assembly.

[0079] Embodiment 2

[0080] The difference between the busbar in Embodiment 2 and that in Embodiment 1 is that:

[0081] As Figure 3As shown, the connection line L of the central axes of the arc surfaces 1112 of two adjacent busbar bodies 11 is arranged parallel to the second preset direction S2. Specifically, multiple battery cells 20 are arranged in a rectangular layout. The above setting of the first busbar 10 ensures that the first busbar 10 can be electrically connected to the battery cells 20, thereby improving the electrical connection reliability between the two.

[0082] Specifically, in Figure 3 , S3 shows the current flow direction of a single internal battery cell 20. A width m is set in the S3 direction (the current direction of the cylindrical battery cell), and the narrow width in the S2 direction (the parallel direction of the cylindrical battery cells) is n. Since the value of m is much larger than the value of n, normally, there will only be electron flow in the S3 direction.

[0083] As Figure 3 shown, the second row body 112 is a first strip plate, and the width of the first strip plate is the same as that of the first row body 111. In this way, the above setting makes the structure of the busbar body 11 simpler, easier to process and implement, reducing the processing cost and difficulty of the first busbar 10. At the same time, the above setting can prevent stress concentration on the busbar body 11 from affecting the structural strength and service life of the first busbar 10.

[0084] As Figure 3 shown, the connecting part 12 is a second strip plate, and the second strip plate is linear. In this way, the above setting makes the structure of the first busbar 10 simpler, easier to process and implement, reducing the processing cost and difficulty of the first busbar 10.

[0085] In this embodiment, the second strip plate and the first strip plate are arranged at a third included angle, and the third included angle is 90°, so that the structure of the first busbar 10 is simpler, easier to process and implement, reducing the processing cost and difficulty of the first busbar 10.

[0086] Embodiment Three

[0087] The difference between the busbar in Embodiment Three and that in Embodiment Two lies in: the structure of the second row body 112 is different.

[0088] As Figure 4 shown, the surface of the second row body 112 facing the positive electrode 21 has an avoidance recess 1121 for avoiding the positive electrode 21. In this way, the above setting can prevent the second row body 112 from contacting the positive electrode 21 and affecting the normal operation of the battery cells 20. Among them, the avoidance recess 1121 is an arc-shaped notch, and the arc-shaped notch is coaxially arranged with the positive electrode 21.

[0089] Embodiment Four

[0090] The difference between the busbar in Embodiment Four and that in Embodiment Three lies in: the shape of the second strip plate is different.

[0091] As Figure 5 and Figure 6 shown, the second strip board is arc-shaped. Specifically, a plurality of battery cells 20 are arranged in a diamond layout (staggered arrangement), and the above setting of the first bus bar 10 ensures that the first bus bar 10 can be electrically connected to the battery cells 20, thereby improving the electrical connection reliability between the two. At the same time, the above setting can prevent stress concentration on the second strip board from affecting the structural strength and service life of the first bus bar 10.

[0092] Embodiment Five

[0093] The difference between the bus bar in Embodiment Five and that in Embodiment Three lies in that: the value of the third included angle A between the second strip board and the first strip board is different.

[0094] As Figure 7 and Figure 8 shown, the second strip board and the first strip board are arranged at a third included angle, and the third included angle is 60°, so that the structure of the first bus bar 10 is simpler, easier to process and realize, and reduces the processing cost and processing difficulty of the first bus bar 10.

[0095] It should be noted that the value of the third included angle is not limited to this and can be adjusted according to the working conditions and usage requirements. Optionally, the second strip board and the first strip board are arranged at a third included angle A, and the third included angle A is greater than or equal to 45° and less than or equal to 90°.

[0096] Embodiment Six

[0097] The difference between the bus bar in Embodiment Six and that in Embodiment Five lies in that: the relationship between the connection line L of the central axes of the arc-shaped surfaces 1112 of two adjacent bus bar bodies 11 and the second preset direction S2 is different.

[0098] As Figure 9 shown, the connection line L of the central axes of the arc-shaped surfaces 1112 of two adjacent bus bar bodies 11 and the second preset direction S2 are arranged at a second included angle. Specifically, a plurality of battery cells 20 are arranged in a diamond layout (staggered arrangement), and the above setting of the first bus bar 10 ensures that the first bus bar 10 can be electrically connected to the battery cells 20, improving the electrical connection reliability between the two.

[0099] Embodiment Seven

[0100] The difference between the bus bar in Embodiment Seven and that in Embodiment Five lies in that: the value of the third included angle A is different.

[0101] As Figure 10 and Figure 11As shown, multiple battery cells 20 are arranged irregularly or there are fewer parallel-connected battery cells. At least one busbar body 11 is electrically connected to two adjacent battery cells 20 arranged along a first preset direction S1, and at least one busbar body 11 is electrically connected to two adjacent battery cells 20 arranged along a second preset direction S2 to meet the electrical connection requirements of the multiple battery cells 20.

[0102] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0103] The first busbar includes multiple busbar bodies. The first row body of each busbar body is electrically connected to the positive electrode of one battery cell, and the second row body of each busbar body is electrically connected to the negative electrode of another battery cell, and the two battery cells are arranged adjacent to each other. The adjacent two busbar bodies are connected by a connecting portion. In this way, since the following relationship is satisfied between the width m of the first row body and the width n of the connecting portion: 3n ≤ m ≤ 12n, the contact area between the first row body and the positive electrode is increased, and the connection strength and connection stability between the first row body and the positive electrode are improved to ensure that the first busbar can be electrically connected to large-diameter and large-capacity battery cells, avoiding the mutual separation between the first busbar and the battery cells and affecting the electrical connection effectiveness between the adjacent two battery cells by the first busbar, thereby solving the problem of poor electrical connection effectiveness between large-capacity battery cells in the prior art and improving the electrical connection effectiveness between the battery cells by the busbar assembly.

[0104] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0105] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0106] It should be noted that the terms "first", "second", etc. in the description, claims, and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0107] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A busbar assembly for a battery module, characterized in that, The bus bar assembly includes a first bus bar (10), and the first bus bar (10) includes: A bus bar body (11), which includes a first row body (111) and a second row body (112). The first row body (111) is electrically connected to the positive electrode (21) of a battery cell (20), and the second row body (112) is electrically connected to the negative electrode (22) of another battery cell (20). The two battery cells (20) are arranged adjacent to each other along a first preset direction S1; there are multiple bus bar bodies (11), and the multiple bus bar bodies (11) are arranged at intervals along a second preset direction S2; Multiple connecting parts (12), each of the connecting parts (12) connecting the second row bodies (112) of two adjacent bus bar bodies (11); Wherein, the following relationship is satisfied between the width m of the first row body (111) and the width n of the connecting part (12): 3n ≤ m ≤ 12n; A narrow-position fuse structure is provided on each of the connecting parts (12). When the current flowing through the connecting part (12) is greater than a preset current value, the narrow-position fuse structure generates heat to fuse the connecting part (12).

2. The busbar assembly according to claim 1, wherein, The first bus bar (10) is an integrally formed structure.

3. The bus bar assembly according to claim 1, characterized in that, The plate thickness of the bus bar body (11) is greater than or equal to 0.5 mm and less than or equal to 2.0 mm; and / or, each of the connecting parts (12) is in a plate shape, and the plate thickness of the connecting part (12) is greater than or equal to 0.5 mm and less than or equal to 2.0 mm.

4. The busbar assembly according to claim 1, characterized in that, The first row body (111) is connected to the positive electrode (21) of the battery cell (20) by laser welding; and / or, the second row body (112) is connected to the negative electrode (22) of the battery cell (20) by laser welding.

5. The bus bar assembly according to claim 1, characterized in that, The positive electrode (21) is cylindrical or annular. The outer peripheral surface of the first row body (111) includes a first plane (1111), an arc surface (1112) and a second plane (1113). The first plane (1111) and the second plane (1113) are arranged parallel to each other, and the arc surface (1112) is coaxially arranged with the positive electrode (21); wherein, the distance between the first plane (1111) and the second plane (1113) is the width m of the first row body (111).

6. The bus bar assembly according to claim 5, wherein, A second included angle is provided between the connection line L of the central axes of the arc surfaces (1112) of two adjacent bus bar bodies (11) and the second preset direction S2.

7. The busbar assembly according to claim 5, wherein, The connection line L of the central axes of the arc surfaces (1112) of two adjacent bus bar bodies (11) is arranged parallel to the second preset direction S2.

8. The bus bar assembly according to claim 1, characterized in that, The second row body (112) is fan-shaped, and at least one of the multiple second row bodies (112) has an avoidance recess (1121) on the surface facing the positive electrode (21), and the avoidance recess (1121) is used to avoid the positive electrode (21).

9. The bus bar assembly according to claim 1, characterized in that, The second row body (112) is a first strip plate, the width of the first strip plate being the same as the width of the first row body (111), and the surface of the second row body (112) facing the positive electrode (21) having an avoidance recess (1121) for avoiding the positive electrode (21).

10. The bus bar assembly according to claim 8 or 9, characterized in that, The connecting portion (12) is a second strip plate, the second strip plate being arc-shaped; alternatively, the second strip plate is linear.

11. The bus bar assembly according to claim 9, characterized in that, The connecting portion (12) is a second strip plate, the second strip plate being arranged at a third included angle A with the first strip plate, the third included angle A being greater than or equal to 45° and less than or equal to 90°.

12. The bus bar assembly according to claim 1, wherein, The bus bar assembly further includes: A second bus bar (30), including a first bus bar body (31), a first tab welding portion (32) and a second tab welding portion (33), the first tab welding portion (32) and the second tab welding portion (33) both being arranged on the first bus bar body (31), the first tab welding portion (32) and / or the second tab welding portion (33) being connected to the negative electrode (22).

13. The bus bar assembly according to claim 1, characterized in that, The bus bar assembly further includes: A third bus bar (40), including a second bus bar body (41), a third tab welding portion (42) and a fourth tab welding portion (43), the third tab welding portion (42) and the fourth tab welding portion (43) both being arranged on the second bus bar body (41), the third tab welding portion (42) and / or the fourth tab welding portion (43) being connected to the positive electrode (21).

14. A battery module, characterized in that, It includes a battery cell (20) and a bus bar assembly, the bus bar assembly being connected to the battery cell (20); wherein, the bus bar assembly is the bus bar assembly according to any one of claims 1 to 13.

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