CN113764832A

CN113764832A - Bus bar assembly and battery module with same

Info

Publication number: CN113764832A
Application number: CN202111166797.9A
Authority: CN
Inventors: 杨红新; 张海建; 唐丽娟; 董汝帅; 其他发明人请求不公开姓名
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2021-12-07

Abstract

The invention provides a bus bar assembly and a battery module with the same. Wherein, the busbar subassembly is used for the battery module, and the busbar subassembly includes first busbar, and first busbar includes: the busbar body comprises a first row body and a second row body, the first row body is electrically connected with the anode of one battery cell, the second row body is electrically connected with the cathode of another battery cell, and the two battery cells are arranged along a first preset direction S₁The adjacent arrangement is realized; the bus bar bodies are multiple and are along a second preset direction S₂Setting at intervals; a plurality of connecting portions each for connecting two adjacent bus bar bodies; whereinThe width m of the first row body and the width n of the connecting part satisfy the following relationship: m is more than or equal to 3n and less than or equal to 12n, and a first preset direction S₁And a second predetermined direction S₂Are arranged at a first included angle. The invention effectively solves the problem of poor electric connection effectiveness between high-capacity battery cores in the prior art.

Description

Bus bar assembly and battery module with same

Technical Field

The invention relates to the technical field of batteries, in particular to a bus bar assembly and a battery module with the same.

Background

At present, a cylindrical battery cell of a battery module gradually evolves from a small-capacity cylinder to a large-capacity cylinder (such as a 46800 cylindrical battery cell or a 46950 cylindrical battery cell), and research and development of the cylinders of many battery factories are focused on a large cylinder direction at present. Among them, the large-capacity cylinder has a higher capacity (capacity of 20Ah or more) and a higher charge/discharge rate (discharge rate of 2C or more), and thus has a more severe requirement for the electrical connection member.

However, to the electric core electricity connection scheme of major diameter, large capacity electricity core, can't connect effectively between the large capacity electricity core among the prior art, influence the performance of the power characteristic of battery module.

Disclosure of Invention

The invention mainly aims to provide a busbar assembly and a battery module with the same so as to solve the problem of poor electric connection effectiveness between high-capacity battery cores in the prior art.

In order to accomplish the above object, according to one aspect of the present invention, there is provided a bus bar assembly for a battery module, the bus bar assembly including a first bus bar including: the busbar body comprises a first row body and a second row body, the first row body is electrically connected with the anode of one battery cell, the second row body is electrically connected with the cathode of another battery cell, and the two battery cells are arranged along a first preset direction S₁The adjacent arrangement is realized; the bus bar bodies are multiple and are along a second preset direction S₂Setting at intervals; a plurality of connecting portions each for connecting two adjacent bus bar bodies; wherein, the width m of the first row body and the width n of the connecting part satisfy the following relation: m is more than or equal to 3n and less than or equal to 12n, and a first preset direction S₁And a second predetermined direction S₂Are arranged at a first included angle.

Furthermore, each connecting part is provided with a narrow fuse structure, and when the current flowing through the connecting part is larger than a preset current value, the narrow fuse structure generates heat to fuse the connecting part.

Furthermore, the first bus bar is of an integrally formed structure.

Further, the thickness of the bus bar body is not less than 0.5mm and not more than 2.0 mm; and/or each connecting part is plate-shaped, and the plate thickness of the connecting part is more than or equal to 0.5mm and less than or equal to 2.0 mm.

Furthermore, the first row body is connected with the positive electrode of the battery cell in a laser welding mode; and/or the second row body is connected with the negative electrode of the battery cell in a laser welding mode.

Further, each connecting portion connects the second row bodies of the adjacent two bus bar bodies.

Furthermore, the anode is cylindrical or annular, the peripheral surface of the first row body comprises a first plane, an arc-shaped surface and a second plane, the first plane and the second plane are arranged in parallel, and the arc-shaped surface and the anode are coaxially arranged; wherein, the distance between the first plane and the second plane is the width m of the first row body.

Furthermore, a connecting line L of the central axes of the arc surfaces of two adjacent bus bar bodies and the second preset direction S₂And are arranged at a second included angle.

Furthermore, a connecting line L of the central axes of the arc surfaces of two adjacent bus bar bodies and the second preset direction S₂Are arranged in parallel with each other.

Further, the second row body is fan-shaped, and the surface of at least one second row body in the plurality of second row bodies facing the positive electrode is provided with an avoidance concave part for avoiding the positive electrode.

Further, the second row body is a first strip-shaped plate, the width of the first strip-shaped plate is the same as that of the first row body, and the surface, facing the positive electrode, of the second row body is provided with an avoidance concave part for avoiding the positive electrode.

Furthermore, the connecting part is a second strip-shaped plate, and the second strip-shaped plate is arc-shaped; or the second strip-shaped plate is linear.

Further, connecting portion are second strip shaped plate, are third contained angle A setting between second strip shaped plate and the first strip shaped plate, and third contained angle A is more than or equal to 45 and less than or equal to 90.

Further, the busbar assembly further includes: the second busbar comprises a first busbar body, a first lug welding part and a second lug welding part, wherein the first lug welding part and the second lug welding part are both arranged on the first busbar body, and the first lug welding part and/or the second lug welding part are connected with the negative electrode.

Further, the busbar assembly further includes: the third busbar, including second busbar body, third tab welding portion and fourth tab welding portion all set up on the second busbar body, and third tab welding portion and/or fourth tab welding portion are connected with the positive pole.

According to another aspect of the present invention, a battery module is provided, which includes a battery core and a busbar assembly, wherein the busbar assembly is connected to the battery core; the bus bar assembly is the bus bar assembly.

By applying the technical scheme of the invention, the first bus bar comprises a plurality of bus bar bodies, the first bus bar body of each bus bar body is electrically connected with the positive electrode of one battery cell, the second bus bar body of each bus bar body is electrically connected with the negative electrode of another battery cell, and two battery cells are arranged adjacently. Two adjacent bus bar bodies are connected through a connecting part. In this way, the following relationship is satisfied between the width m of the first row body and the width n of the connecting portion: m is not less than 3n and is not more than 12n, and then the area of contact between the first row of body and the positive pole has been increased, the joint strength and the connection stability between the first row of body and the positive pole have been promoted, in order to ensure that first busbar can the electricity connect major diameter, the large capacity electricity core, avoid taking place to break away from each other and influence the electric connection validity between first busbar to two adjacent electric cores between first busbar and the electric core, and then solved among the prior art the relatively poor problem of electric connection validity between the large capacity electricity core, the electric connection validity between the busbar subassembly to the electric core has been promoted.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a first embodiment of a busbar assembly according to the present invention;

FIG. 2 shows an enlarged schematic view at B of the busbar assembly of FIG. 1;

FIG. 3 shows a schematic structural view of a second embodiment of a busbar assembly according to the present invention;

fig. 4 is a schematic structural view showing a first bus bar of the third embodiment of the bus bar assembly according to the present invention;

FIG. 5 shows a schematic structural view of a fourth embodiment of a busbar assembly according to the present invention;

FIG. 6 shows a schematic view of a first busbar of the busbar assembly of FIG. 5;

FIG. 7 shows a schematic structural view of an embodiment five of the busbar assembly according to the invention;

FIG. 8 is a schematic diagram of a first busbar of the busbar assembly of FIG. 7;

fig. 9 is a schematic structural view showing a first bus bar of a sixth embodiment of the bus bar assembly according to the present invention;

fig. 10 is a schematic structural view showing a seventh embodiment of the busbar assembly according to the present invention; and

fig. 11 shows a schematic view of the first busbar of the busbar assembly of fig. 10.

Wherein the figures include the following reference numerals:

10. a first bus bar; 11. a bus bar body; 111. a first row body; 1111. a first plane; 1112. an arc-shaped surface; 1113. a second plane; 112. a second row of bodies; 1121. avoiding the concave part; 12. a connecting portion; 20. an electric core; 21. a positive electrode; 22. a negative electrode; 30. a second bus bar; 31. a first busbar body; 32. a first tab welding part; 33. a second tab weld; 40. a third bus bar; 41. a second busbar body; 42. a third tab weld; 43. a fourth lug welding part; 50. a low voltage collection circuit; 60. sampling a tab; 70. and (7) positioning the holes.

Detailed Description

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

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless stated to the contrary, use of the directional terms "upper and lower" are generally directed to the orientation shown in the drawings, or to the vertical, or gravitational direction; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.

In order to solve the relatively poor problem of electric connection validity between the large capacity electricity core among the prior art, this application provides a busbar subassembly and has its battery module.

Example one

As shown in fig. 1 and 2, a bus bar assembly is used for a battery module, the bus bar assembly including a first bus bar 10, the first bus bar 10 including a bus bar body 11 and a plurality of connection 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 one battery cell 20, the second row body 112 is electrically connected to the negative electrode 22 of another battery cell 20, and the two battery cells 20 are along a first preset direction S₁Are adjacently arranged. The plurality of bus bars 11 are arranged along a second predetermined direction S₂The arrangement is spaced. Each connecting portion 12 is used to connect two adjacent bus bar bodies 11. Wherein, the width m of the first row 111 and the width n of the connecting portion 12 satisfy the following relationship: m is more than or equal to 3n and less than or equal to 12n, and a first preset direction S₁And a second predetermined direction S₂Are arranged at a first included angle.

With the technical solution of the present embodiment, the first busbar 10 includes a plurality of busbar bodies 11, the first busbar body 111 of each busbar body 11 is electrically connected to the positive electrode 21 of one battery cell 20, the second busbar body 112 of each busbar body 11 is electrically connected to the negative electrode 22 of another battery cell 20, and two battery cells 20 are disposed adjacent to each other. The two adjacent bus bar bodies 11 are connected by a connecting portion 12. In this way, the following relationship is satisfied between the width m of the first row 111 and the width n of the connection portion 12: m is not less than 3n and is not more than 12n, and then the area of contact between the first row of body 111 and the positive pole 21 has been increased, the joint strength and the connection stability between the first row of body 111 and the positive pole 21 have been promoted, in order to ensure that first busbar 10 can the electricity connect major diameter, large capacity electricity core 20, avoid taking place to break away from each other between first busbar 10 and the electricity core 20 and influence first busbar 10 to the electric connection validity between two adjacent electricity cores 20, and then solved among the prior art the relatively poor problem of electric connection validity between large capacity electricity core, the electric connection validity between the busbar subassembly to the electricity core has been promoted.

In the present embodiment, the bus bars are in the overall layout, S₁Is the longitudinal direction of the battery module and is also the direction of the current of the battery module, S₂The direction is the transverse direction of battery module, also is the whole direction between parallelly connected of electric core of battery module busbar simultaneously.

In this embodiment, since the width m of the first row 111 is much greater than the width n of the connecting portion 12, the current-carrying cross section between the series connection of the cells in the battery module is much greater than the current-carrying cross section between the parallel connection of the cells. Meanwhile, the current paths among the single battery cells are solidified by the arrangement, so that the branch current paths of the battery cells are not crossed. The third busbar 40 (total positive busbar) and the second busbar 30 (total negative busbar) are arranged at S₁The bus bar assembly has a large cross section in the direction, and under the condition of the same current-carrying cross section, the overall design thickness of the bus bar assembly in the embodiment is the thinnest, and the cost is better.

In this embodiment, the busbar assembly is disposed on the positive electrode side of the battery cell 20, that is, a single-side welding manner is adopted between the busbar assembly and the battery cell 20, so that a cooling device is conveniently disposed on the negative electrode side of the battery cell 20, or the negative electrode side of the battery cell 20 is used as an adhesion surface, thereby facilitating the grouping design of the battery cells ctp (cell to pack) and ctc (cell to sessions).

Optionally, if the rated capacity of the cylindrical battery core is 30Ah, the requirement of the battery system meets 2C charging, and a 1mm aluminum bar (including an insulating cover layer) design is adopted, the value of m is not less than 16mm, and the recommended value of the narrow n is 1.33-5.33 mm.

Optionally, the bus bar assembly is connected with a PCB board or an FPC board and forms a CCS assembly (cell connecting system) for bus bar and low voltage collection of a large capacity cylinder. Therefore, the traditional split type low-voltage wire harness collection and high-voltage connecting piece are omitted, the high-voltage connecting piece is integrated into one component, and the component can also be used as one part of the battery cell grouping component, so that the process steps are reduced, and the cost is reduced. After CCS subassembly and electric core are in groups, because of having reduced the use of pencil, and effectively avoided the alternately of pencil, make electrical safety higher to the inefficacy risk that arouses because of the electric connector trouble has been reduced.

Specifically, the CCS assembly has a predetermined stiffness, which needs to meet the use requirement of the battery module, and after the CCS assembly is welded to the battery cell 20, the CCS assembly serves as a support for the positive electrode of the battery cell and also serves as a part of the battery cell grouping frame. Meanwhile, the CCS assembly can be used as a welding clamp in the welding process of the battery core.

Alternatively, the CCS module packages the bus bar module for serial and parallel connection and bus output and the low voltage collecting line in an insulating resin plate or is embedded in a plastic bracket, and if the module is embedded in the bracket, structural glue is matched to integrate the module. Like this, the CCS subassembly is used for the cylindrical high-voltage electricity of large capacity to connect and the low pressure is gathered, and the CCS subassembly adopts the design of integrating, with high-low pressure sampling unit integration one, through resin package whole in order to reduce the assembly process for this electricity core can reduce cost effectively in groups.

In this embodiment, the first bus bar 10 is provided with functional holes (such as glue injection holes, positioning holes and mounting holes), such as some glue injection holes are reserved, so as to facilitate glue injection after grouping of the battery cells, and the functional holes can also be used as mounting holes or clamping holes of the insulating covering member.

Optionally, a positioning pin is provided on the CCS assembly so as to limit the position of the CCS assembly with the battery cell 20.

In this embodiment, the first included angle is 90 °, and the plurality of battery cells 20 are distributed in a diamond shape.

In this embodiment, the parallel direction of the battery cells 20 is parallel to the first bus bar 10 or approximately the same as the layout trend, and it is necessary to ensure that the high-voltage bus bar is connected to one side of the first bus bar 10 in series, and the low-voltage sampling is performed to the other side of the first bus bar.

In the present embodiment, each connecting portion 12 is provided with a narrow fuse structure, and when the current flowing through the connecting portion 12 is greater than a predetermined current value, the narrow fuse structure generates heat to fuse the connecting portion 12. Thus, if a single battery cell 20 fails due to leakage or overdischarge of a certain battery cell 20 or other abnormal factors, the battery cell 20 is reversely charged to cause overload equalization, and the connecting portion 12 is fused to avoid causing a secondary disaster or thermal runaway.

Specifically, be the fourth contained angle setting between the extending direction of narrow position fuse structure and each connecting portion 12 to ensure that the narrow position fuse structure can fuse connecting portion 12, promoted the fusing reliability of narrow position fuse structure.

In the present embodiment, the first bus bar 10 is an integrally formed structure. Like this, above-mentioned setting has not only promoted the structural strength of first busbar 10, has prolonged the life of first busbar 10, also makes the processing of first busbar 10 easier, simple and convenient, has reduced the processing cost and the processing degree of difficulty of busbar subassembly.

Alternatively, the thickness of the busbar body 11 is 0.5mm or more and 2.0mm or less. In this way, the arrangement ensures that the first bus bar 10 can normally carry current, so that all the battery cells 20 can normally operate, and the structure of the bus bar body 11 is simpler, and the processing and the implementation are easier. Simultaneously, the miniaturized design of busbar subassembly has been realized to above-mentioned setting, and then has reduced battery module's whole occupation space.

In the present embodiment, the thickness of the busbar body 11 is 1.0 mm. The thickness of the bus bar body 11 is not limited to this, and may be adjusted according to the operating condition and the use requirement. Optionally, the thickness of the busbar body 11 is 0.8mm, or 1.2mm, or 1.5mm, or 1.6mm, or 1.8 mm.

Alternatively, each connecting portion 12 has a plate shape, and the plate thickness of the connecting portion 12 is 0.5mm or more and 2.0mm or less. Thus, the arrangement ensures that two adjacent bus bar bodies 11 can be electrically connected, so that the FPC board samples a plurality of battery cells 20, and the structure of the bus bar bodies 11 is simpler, and the bus bar bodies are easy to process and implement. Simultaneously, the miniaturized design of busbar subassembly has been realized to above-mentioned setting, and then has reduced battery module's whole occupation space.

In the present embodiment, the plate thickness of the connecting portion 12 coincides with the plate thickness of the busbar body 11.

In the present embodiment, the first row 111 and the positive electrode 21 of the battery cell 20 are connected by laser welding. Like this, above-mentioned setting has promoted the joint strength of first row of body 111 with anodal 21, has further promoted the busbar subassembly to the electric connection validity between electric core to ensure that battery module can normal operating.

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

In the present embodiment, each connecting portion 12 connects the second row bodies 112 of the adjacent two bus bar bodies 11. Thus, the arrangement makes the structure of the first busbar 10 simpler, and the first busbar is easy to process and realize, so that the processing cost and the processing difficulty of the busbar assembly are reduced.

As shown in fig. 2, the positive electrode 21 is cylindrical or annular, the outer circumferential surface of the first row 111 includes a first plane 1111, an arc-shaped plane 1112, and a second plane 1113, the first plane 1111 and the second plane 1113 are parallel to each other, and the arc-shaped plane 1112 and the positive electrode 21 are coaxially disposed. The distance between the first plane 1111 and the second plane 1113 is the width m of the first bank 111.

As shown in FIG. 1, two adjacent bus bars 11A line L connecting the central axes of the arc-shaped surfaces 1112 and the second predetermined direction S₂And are arranged at a second included angle. Specifically, the plurality of battery cells 20 are arranged in a diamond shape (staggered arrangement), and the arrangement of the first bus bar 10 ensures that the first bus bar 10 can be electrically connected with the battery cells 20, so that the reliability of electrical connection between the battery cells 20 and the first bus bar 10 is improved.

As shown in fig. 1, the second row bodies 112 have a fan shape, and at least one second row body 112 of the plurality of second row bodies 112 has a recess 1121 on a surface facing the positive electrode 21, and the recess 1121 is for avoiding the positive electrode 21. Thus, the arrangement increases the contact area between the second row 112 and the negative electrode 22, and improves the electrical connection reliability of the busbar assembly. Meanwhile, the arrangement can prevent the second row body 112 from being connected with the positive electrode 21 to affect the normal operation of the battery cell 20. Meanwhile, the second row body 112 is simpler in structure, easy to process and realize, and the processing cost of the busbar assembly is reduced.

As shown in fig. 1, the busbar assembly further includes a second busbar 30. The second busbar 30 includes a first busbar 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 are both disposed on the first busbar body 31, and the first tab welding portion 32 and/or the second tab welding portion 33 are connected to the negative electrode 22.

As shown in fig. 1, the busbar assembly further includes a third busbar 40. The third busbar 40 includes a second busbar 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 are both disposed on the second busbar body 41, and the third tab welding portion 42 and/or the fourth tab welding portion 43 are connected to the positive electrode 21.

In this embodiment, the first busbar 10 is provided with a positioning hole 70, and the positioning hole 70 is in limit fit with a positioning convex portion on the cell holder, so as to realize positioning between the first busbar 10 and the cell holder.

As shown in fig. 1, the first bus bars 10 are plural, and each of the first bus bars 10 is along the second predetermined direction S₂In extension, each first busbar 10 further includes a sampling tab 60, and the busbar assembly further includes a lower tabAnd the voltage collecting lines 50 are connected with the sampling lugs 60 of the first busbars 10.

Optionally, the first row body 111 and the positive electrode 21 are welded by using a ring-shaped welding spot layout to ensure the welding strength of the two. In this embodiment, the positive electrode welding area is semicircular, and a circular welding area or an annular welding area is reserved.

It should be noted that the solder joint layout is not limited to this, and can be adjusted according to the working condition and the use requirement. Optionally, the solder joint layout is in the shape of a bar or a star or other shapes.

It should be noted that the welding manner between the first row 111 and the positive electrode 21 is not limited to this, and may be adjusted according to the working condition and the use requirement. Alternatively, resistance welding or bonding welding is used between the first bank 111 and the positive electrode 21.

It should be noted that the welding between the first row 111 and the positive electrode 21 and the welding between the second row 112 and the negative electrode 22 are required to meet the current-carrying requirement of the battery cell 20.

Optionally, the second row 112 and the negative electrode 22 are welded by using a ring-shaped welding spot layout to ensure the welding strength of the two.

It should be noted that the welding manner between the second row 112 and the negative electrode 22 is not limited to this, and may be adjusted according to the working condition and the use requirement. Optionally, resistance welding, or bonding welding, is used between the second row 112 and the negative electrode 22.

Optionally, the first bus bar 10 is made of 1-series aluminum, red copper or copper-aluminum composite material, so that the material of the first bus bar 10 is more flexibly selected, different use requirements and different working conditions are met, and the processing flexibility of workers is improved.

As shown in fig. 1, the present application further provides a battery module, which includes a battery cell 20 and a busbar assembly, wherein the busbar assembly is connected to the battery cell 20. The bus bar assembly is the bus bar assembly.

Example two

The bus in the second embodiment is different from the bus in the first embodiment in that:

as shown in fig. 3, the arc-shaped faces of two adjacent bus bar bodies 111112 has a second predetermined direction S and a line L connecting the central axes thereof₂Are arranged in parallel with each other. Specifically, the plurality of battery cells 20 are in a rectangular layout, and the arrangement 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 reliability of the electrical connection between the battery cells and the battery cells.

Specifically, in FIG. 3, S₃The current flow direction of the inner single cell 20 is shown. At S₃Set width m in direction (current direction of cylindrical cell) at S₂The narrow width in the direction (parallel direction of the cylindrical battery cells) is n, and as the value of m is far greater than the value of n, the width of m is only in S under normal conditions₃There is a flow of electrons in the direction.

As shown in fig. 3, the second row body 112 is a first strip-shaped plate having the same width as the first row body 111. Thus, the bus bar body 11 is simpler in structure, easy to machine and implement, and the machining cost and the machining difficulty of the first bus bar 10 are reduced. Meanwhile, the above arrangement can prevent the stress concentration from occurring on the bus bar body 11 to affect the structural strength and the service life of the first bus bar 10.

As shown in fig. 3, the connecting portion 12 is a second strip-shaped plate, and the second strip-shaped plate is linear. Thus, the arrangement makes the structure of the first bus bar 10 simpler, and the first bus bar is easy to process and implement, so that the processing cost and the processing difficulty of the first bus bar 10 are reduced.

In this embodiment, be the setting of third contained angle between second BAR shaped plate and the first BAR shaped plate, the third contained angle is 90 to make first busbar 10's structure simpler, easy to process, realization have reduced first busbar 10's processing cost and processing degree of difficulty.

EXAMPLE III

The bus bar in the third embodiment is different from the bus bar in the second embodiment in that: the second bank 112 is different in structure.

As shown in fig. 4, the surface of the second row 112 facing the positive electrode 21 has a recess 1121 for avoiding the positive electrode 21. Thus, the arrangement can prevent the second row 112 from contacting the positive electrode 21 and affecting the normal operation of the battery cell 20. The avoidance concave portion 1121 is an arc-shaped notch, and the arc-shaped notch is coaxially arranged with the positive electrode 21.

Example four

The bus bar in the fourth embodiment is different from that in the third embodiment in that: the second strip-shaped plates are different in shape.

As shown in fig. 5 and 6, the second strip is arcuate. Specifically, the plurality of battery cells 20 are arranged in a diamond shape (staggered arrangement), and the arrangement of the first bus bar 10 ensures that the first bus bar 10 can be electrically connected with the battery cells 20, thereby improving the reliability of the electrical connection between the battery cells and the battery cells. Meanwhile, the above arrangement can prevent the stress concentration from occurring on the second strip-shaped plate to affect the structural strength and the service life of the first bus bar 10.

EXAMPLE five

The bus bar in the fifth embodiment is different from the third embodiment in that: the values of the third included angle A between the second strip-shaped plate and the first strip-shaped plate are different.

As shown in fig. 7 and 8, a third included angle is formed between the second strip-shaped plate and the first strip-shaped plate, and the third included angle is 60 degrees, so that the structure of the first bus bar 10 is simpler, the processing is easy, the implementation is easy, and the processing cost and the processing difficulty of the first bus bar 10 are reduced.

It should be noted that the value of the third angle is not limited to this, and may be adjusted according to the working condition and the use requirement. Optionally, a third included angle a is formed between the second strip-shaped plate and the first strip-shaped plate, and the third included angle a is greater than or equal to 45 ° and less than or equal to 90 °.

EXAMPLE six

The bus bar in the sixth embodiment is different from the fifth embodiment in that: a line L connecting the central axes of the arc-shaped surfaces 1112 of two adjacent bus bars 11 and the second predetermined direction S₂The relationship between them is different.

As shown in fig. 9, a line L connecting the central axes of the arc-shaped surfaces 1112 of two adjacent bus bars 11 is connected to the second predetermined direction S₂And are arranged at a second included angle. Specifically, the plurality of battery cells 20 are arranged in a diamond shape (staggered arrangement), and the arrangement of the first bus bar 10 ensures that the first bus bar 10 can be electrically connected with the battery cells 20, so that the reliability of electrical connection between the battery cells 20 and the first bus bar 10 is improved.

EXAMPLE seven

The bus bar in the seventh embodiment is different from the fifth embodiment in that: the values of the third included angle a are different.

As shown in fig. 10 and 11, the plurality of battery cells 20 are irregularly arranged or less in parallel, and the at least one bus bar body 11 is arranged along the first predetermined direction S₁Two adjacent cells 20 are electrically connected, and at least one busbar body 11 extends along a second predetermined direction S₂Two adjacent battery cells 20 are electrically connected to meet the electrical connection requirement of the plurality of battery cells 20.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

the first busbar comprises a plurality of busbar bodies, the first busbar body of each busbar body is electrically connected with the positive electrode of one battery cell, the second busbar body of each busbar body is electrically connected with the negative electrode of another battery cell, and the two battery cells are arranged adjacently. Two adjacent bus bar bodies are connected through a connecting part. In this way, the following relationship is satisfied between the width m of the first row body and the width n of the connecting portion: m is not less than 3n and is not more than 12n, and then the area of contact between the first row of body and the positive pole has been increased, the joint strength and the connection stability between the first row of body and the positive pole have been promoted, in order to ensure that first busbar can the electricity connect major diameter, the large capacity electricity core, avoid taking place to break away from each other and influence the electric connection validity between first busbar to two adjacent electric cores between first busbar and the electric core, and then solved among the prior art the relatively poor problem of electric connection validity between the large capacity electricity core, the electric connection validity between the busbar subassembly to the electric core has been promoted.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bus bar assembly for a battery module, the bus bar assembly comprising a first bus bar (10), the first bus bar (10) comprising:

the busbar body (11) comprises a first row body (111) and a second row body (112), wherein the first row body (111) is electrically connected with a positive electrode (21) of one battery cell (20), the second row body (112) is electrically connected with a negative electrode (22) of another battery cell (20), and the two battery cells (20) are arranged along a first preset direction S₁The adjacent arrangement is realized; the bus bar bodies (11) are multiple, and the multiple bus bar bodies (11) are arranged along a second preset direction S₂Setting at intervals;

a plurality of connecting portions (12), each connecting portion (12) connecting two adjacent bus bar bodies (11);

wherein the width m of the first row body (111) and the width n of the connecting part (12) satisfy the following relation: m is more than or equal to 3n and less than or equal to 12 n.

2. The busbar assembly according to claim 1, wherein each of the connecting portions (12) is provided with a fuse structure which generates heat to fuse the connecting portion (12) when a current flowing through the connecting portion (12) is greater than a preset current value.

3. The busbar assembly according to claim 1, wherein the first busbar (10) is of unitary construction.

4. The busbar assembly according to claim 1, wherein the thickness of the busbar body (11) is 0.5mm or more and 2.0mm or less; and/or each connecting part (12) is plate-shaped, and the plate thickness of each connecting part (12) is more than or equal to 0.5mm and less than or equal to 2.0 mm.

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

6. The busbar assembly according to claim 1, wherein each of the connecting portions (12) connects the second row bodies (112) of two adjacent busbar bodies (11).

7. The busbar assembly according to claim 1, wherein the positive electrode (21) is cylindrical or annular, and the outer circumferential surface of the first row body (111) includes a first plane (1111), an arc-shaped surface (1112) and a second plane (1113), the first plane (1111) and the second plane (1113) being arranged in parallel with each other, the arc-shaped surface (1112) being arranged coaxially 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 bank (111).

8. The buss bar assembly of claim 7, wherein the buss bar assembly comprises a plurality of support membersA connecting line L of the central axes of the arc surfaces (1112) of two adjacent bus bars (11) and the second preset direction S₂And are arranged at a second included angle.

9. Busbar assembly according to claim 7, wherein a line L connecting the central axes of the arc-shaped faces (1112) of two adjacent busbar bodies (11) with the second predetermined direction S₂Are arranged in parallel with each other.

10. The busbar assembly according to claim 1, wherein the second row body (112) has a fan shape, and a surface of at least one second row body (112) of the plurality of second row bodies (112) facing the positive electrode (21) has an avoidance recess (1121), and the avoidance recess (1121) is used for avoiding the positive electrode (21).

11. The busbar assembly according to claim 1, wherein the second row body (112) is a first strip-shaped plate having the same width as the first row body (111), and a surface of the second row body (112) facing the positive electrode (21) has an avoidance recess (1121) for avoiding the positive electrode (21).

12. Busbar assembly according to claim 10 or 11, wherein the connecting portion (12) is a second strip, which is curved; or the second strip-shaped plate is linear.

13. The busbar assembly according to claim 11, wherein the connecting portion (12) is a second strip-shaped plate, and the second strip-shaped plate is disposed at a third included angle a with respect to the first strip-shaped plate, and the third included angle a is greater than or equal to 45 ° and less than or equal to 90 °.

14. The buss bar assembly of claim 1, further comprising:

second busbar (30), including first busbar body (31), first utmost point ear welding part (32) and second utmost point ear welding part (33), first utmost point ear welding part (32) with second utmost point ear welding part (33) all set up on first busbar body (31), first utmost point ear welding part (32) and/or second utmost point ear welding part (33) with negative pole (22) are connected.

15. The buss bar assembly of claim 1, further comprising:

third busbar (40), including second busbar body (41), third tab welding portion (42) and fourth tab welding portion (43), third tab welding portion (42) with fourth tab welding portion (43) all sets up on second busbar body (41), third tab welding portion (42) and/or fourth tab welding portion (43) with positive pole (21) are connected.

16. A battery module, comprising a battery cell (20) and a busbar assembly connected to the battery cell (20); wherein the busbar assembly is as claimed in any one of claims 1 to 15.