CN218300139U

CN218300139U - Busbar aluminum bar, battery module and battery pack

Info

Publication number: CN218300139U
Application number: CN202222100115.0U
Authority: CN
Inventors: 陈兴述
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2023-01-13
Anticipated expiration: 2032-08-10

Abstract

The utility model relates to a battery manufacturing technology field especially relates to a busbar aluminum, battery module and battery package. The bus aluminum bar mainly comprises a connecting part, a first extending part and a second extending part. Wherein, the both sides of connecting portion extend first extension and second extension respectively, all are provided with heavy groove on first extension and the second extension, and the projection of heavy groove along its direction of height is oval. The aluminum busbar is simple in structure, capable of improving the overcurrent of current, capable of improving the power generation of the battery cell and capable of saving the manufacturing cost.

Description

Busbar aluminum bar, battery module and battery pack

Technical Field

The utility model relates to a battery manufacturing technology field especially relates to a busbar aluminum, battery module and battery package.

Background

With the development of economy and the progress of science and technology, new energy electric vehicles are gradually widely applied to the work and life of people due to the advantages of energy conservation, environmental protection and the like. The demand of the power lithium battery as a main energy source of a new energy automobile is increasing continuously. The inside battery module of power lithium cell comprises a plurality of electric cores usually, carries out the series-parallel connection through the aluminium row between a plurality of electric cores.

In the prior art, circular through holes are formed in aluminum bars, circular counter bores are punched around the circular through holes, and then the aluminum bars are welded with electrodes of battery cells to realize connection of the aluminum bars and the battery cells. The welding area formed by welding the aluminum bar structure with the battery cell electrode is smaller, so that the overcurrent of current is limited, and the power generation power of the battery cell is reduced. If the area of the welding area is enlarged by only increasing the diameter of the circular counter bore blindly, the current overflow can be improved, but the strength of the whole aluminum bar is reduced, and the reliability of the battery module is affected.

Therefore, it is desirable to design a bus bar, a battery module and a battery pack to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide a converge aluminum bar, this converge aluminum bar simple structure can improve the overcurrent volume of electric current, improves the generated power of electric core, practices thrift manufacturing cost.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a busbar aluminum, include:

the connecting portion, first extension and second extension are extended respectively to the both sides of connecting portion, first extension with all be provided with heavy groove on the second extension, heavy groove is oval along its direction of height's projection.

As an optional technical scheme of the bus aluminum bar, the ratio of the long diameter of the sinking groove to the short diameter of the sinking groove is N, and the range of N is more than 1.0 and less than or equal to 2.0.

As an optional technical scheme of the aluminum busbar, the cross section of the sinking groove along the long diameter direction or the cross section of the sinking groove along the short diameter direction is in an inverted trapezoid shape.

As an optional technical scheme of the bus aluminum bar, a welding area is arranged on the bottom surface of the sinking groove, the welding area is in an annular runway shape, and the welding area is arranged in an equal width mode.

As an optional technical scheme of the aluminum busbar, the bottom surface of the sinking groove is provided with a blank area, the projection of the blank area in the height direction of the sinking groove is elliptical, the outer edge of the blank area coincides with the inner edge of the welding area, and the blank area and the welding area jointly form the bottom surface of the sinking groove.

As an optional technical scheme of the bus aluminum bar, a positioning through hole is formed in the blank area, and the positioning through hole and the blank area are coaxially arranged.

As an optional technical scheme of the bus aluminum bar, the connecting part is in an arc-shaped bulge along the height direction of the sinking groove.

As an optional technical scheme of the bus aluminum bar, the sinking groove is formed by integral punch forming.

A second object of the present invention is to provide a battery module, which comprises a plurality of battery cells and a busbar, wherein the busbar is used for connecting two adjacent battery cells.

A third object of the present invention is to provide a battery pack, wherein the battery pack includes a plurality of battery modules.

The beneficial effects of the utility model include at least:

the utility model provides a busbar aluminum bar, this busbar aluminum bar mainly include connecting portion, first extension and second extension. Wherein, the both sides of connecting portion extend first extension and second extension respectively, all are provided with heavy groove on first extension and the second extension, and the projection of heavy groove along its direction of height is oval. Set up to oval through sinking the groove, compare with the circular heavy groove in the conventional art, the utility model provides an oval heavy groove can increase certain welding area, and then improves the overflow volume of electric current, improves the generating power of electric core. Because the oval heavy groove of this application has the advantage that improves the electric current and cross the flow, consequently under the prerequisite that reaches the same electric current and cross the flow in advance, the aluminium busbar of the oval heavy groove in this application of adoption can make the volume of aluminium busbar design littleer, more miniaturized, saves the consumptive material to can reserve out longer creepage distance (on same battery module, the shortest distance between two adjacent aluminium busbars promptly), improve the security performance of electric core. In addition, in the prior art, a polishing process is usually required to be performed on the bottom of the circular sink to achieve the required current overflow capacity. And oval heavy groove in this application has the bigger advantage with the area of electrode contact, and when reaching the condition under the ability of equal excess flow like this, oval heavy groove in this application can be lower to the requirement of polishing, need not the polishing even and both can directly assemble the use, improves processing manufacturing efficiency, and then reduction in production cost.

The utility model also provides a battery module, this battery module include above aluminium bar and a plurality of electric core that converges, and the aluminium bar that converges is used for connecting two adjacent electric cores. Because the battery module has the structure of the bus aluminum bar, the current overflow of the battery module can be improved, and the power generation power of the battery module is improved.

The utility model also provides a battery package, this battery package is including above battery module, and manufacturing cost can be practiced thrift to this battery package, promotes the generated power of battery package.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural view of a bus aluminum bar according to an embodiment of the present invention;

fig. 2 is a top view of a bus aluminum bar provided by an embodiment of the present invention;

fig. 3 isbase:Sub>A cross-sectional view taken atbase:Sub>A-base:Sub>A in fig. 2.

Reference numerals

100. A connecting portion; 200. a first protruding portion; 210. sinking a groove; 2101. a welding area; 2102. a blank area is reserved; 2103. positioning the through hole; 300. a second projecting portion.

Detailed Description

In order to make the technical problems, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further explained below by means of specific embodiments in conjunction with the accompanying drawings.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

As shown in fig. 1 to fig. 3, the present embodiment provides a bus aluminum bar, where the bus aluminum bar is used to be connected to two adjacent battery cells, and is connected to a positive electrode or a negative electrode of the battery cell to implement series-parallel connection of the battery cells. The bus bar mainly includes a connection portion 100, a first protrusion 200, and a second protrusion 300. The first extending portion 200 and the second extending portion 300 extend from two sides of the connecting portion 100, the first extending portion 200 and the second extending portion 300 are both provided with a sinking groove 210, a projection of the sinking groove 210 in a height direction is an ellipse, a ratio of a major diameter of the sinking groove 210 to a minor diameter of the sinking groove 210 is N, N is in a range of 1.0 < N < 2.0, that is, N can be set to values of 1.1, 1.2, 1.5, 1.8, 2.0, and the like, so that the sinking groove 210 is an ellipse. If the value of N is greater than 2.0, the shape of the sinking groove 210 is still elliptical, but the area of the sinking groove 210 is too large, which causes the strength of the first protruding part 200 and the second protruding part 300 to be reduced, and further reduces the reliability of the aluminum busbar and the service life thereof. Since N is the ratio of the major diameter to the minor diameter of the ellipse, the value of N is not less than 1.0, and will not be described in detail herein.

Based on the above design, the aluminum busbar in this embodiment is made of aluminum metal, that is, the connecting portion 100, the first protruding portion 200, and the second protruding portion 300 are integrally formed by a die, the sinking groove 210 is formed by integral punch, and the drawing angle is 45 °. Optionally, in this embodiment, the aluminum busbar is welded to the electrode of the battery cell by laser welding. When the welding gun works, a welding gun head of a laser welding machine extends into the sinking groove 210, the bottom surface of the sinking groove 210 is welded with an electrode after being melted, a welding area 2101 (a middle influence part in fig. 1) welded by the welding gun head is in an annular runway shape due to the influence of a welding process, the welding area 2101 is arranged in equal width, and the width of the welding area 2101 can be set to be 3mm, for example. The welding area 2101 of annular runway shape can match the degree of smoothness of welding rifle head, and then improves welding quality and welding precision, and square welding area territory or other irregular welding area territories can make the risk that the laser welding rifle head appears overwelding or rosin joint in welding process.

Compared with the prior art, the bus aluminum bar in the embodiment is provided with the sinking groove 210 in an oval shape, and compared with the circular sinking groove 210 in the prior art, the oval sinking groove 210 in the embodiment can increase the area of the welding area 2101, so that the current overflow is improved, and the power generation power of the battery cell is improved. Because the oval heavy groove 210 of this application has the advantage that improves the electric current and crosses the flow, consequently under the prerequisite that reaches the same electric current and crosses the flow in advance, the volume that the oval heavy groove 210's that adopts in this application converge aluminum busbar can make the design of converge aluminum busbar is littleer, more miniaturized, saves the consumptive material to can reserve longer creepage distance (promptly on same battery module, the shortest distance between two adjacent converge aluminum busbars), improve the security performance of electric core. In addition, the polishing process is typically performed at the bottom of the circular sink 210 to achieve the desired current flow capacity. And oval heavy groove 210 in this application has the bigger advantage with the area of electrode contact, and when reaching the condition under the ability of equal excess flow like this, oval heavy groove 210 in this application can be lower to the requirement of polishing, need not the polishing even and both can directly assemble the use, improves manufacturing efficiency, and then reduction in production cost.

Alternatively, the thickness of each of the first protrusion 200 and the second protrusion 300 in this embodiment may be set to be between 2.5mm and 4.0mm, and the depth of the sink groove 210 may be set to be between 1.5mm and 2.0 mm.

Alternatively, as shown in fig. 3, the cross section of the sinking groove 210 along the long diameter direction thereof or the cross section of the sinking groove 210 along the short diameter direction thereof in the present embodiment is an inverted trapezoid. That is, the upper end surface (the surface without solid area) and the lower end surface (i.e., the bottom surface of the sink groove 210) of the sink groove 210 in this embodiment are both elliptical, and the area of the upper end surface is larger than that of the lower end surface, and the lower end surface is connected to the edge of the upper end surface through the arc curved surface. Therefore, the welding head can be prevented from touching the side wall of the sinking groove 210 when welding the bottom surface of the sinking groove 210, and the welding quality is improved.

As shown in fig. 1-2, in the present embodiment, because of being limited by the influence of the welding process, the bottom surface of the sinking groove 210 is provided with a blank area 2102, a projection of the blank area 2102 in the height direction of the sinking groove 210 is an ellipse, an outer edge of the blank area 2102 coincides with an edge of the welding area 2101, and the blank area 2102 and the welding area 2101 together constitute the bottom surface of the sinking groove 210. It is emphasized that the margin region 2102 and the welding region 2101 can both pass current, thereby increasing the amount of current flowing.

As shown in fig. 1 and 3, in the margin area 2102 in this embodiment, a positioning through hole 2103 is formed, and the positioning through hole 2103 is coaxially disposed with the margin area 2102. Be provided with camera positioner on the laser-beam welding machine, shoot to positioning hole 2103 through camera positioner in real time and catch the signal, and then confirm whether the position of this busbar puts the accuracy in place. The operator can flexibly set the shape of the positioning through hole 2103 according to actual requirements, for example, the shape can be a circular hole, a square hole, an elliptical hole, etc., as long as the positioning function can be achieved, which is not further limited in this embodiment.

As shown in fig. 3, in this embodiment, along the height direction of the sinking groove 210, the connecting portion 100 is a circular arc-shaped protrusion, so that a certain avoiding region is formed below the connecting portion 100, and thus when the aluminum busbar is disposed on the battery module, it is beneficial to adapt to other parts on the battery module, so that the aluminum busbar is not interfered in installation. Meanwhile, the bus aluminum bar can be prevented from being shrunk in cold weather, and the risk of fracture of the bus aluminum bar is caused.

This embodiment still provides a battery module, and this battery module includes above aluminium bar and a plurality of electric core of converging, and the aluminium bar that converges is used for connecting two adjacent electric cores. Specifically, the bus aluminum bar enables the first extending portion 200 and the second extending portion 300 to be welded on the electrodes of two adjacent battery cells respectively in a laser welding mode, so that series-parallel connection of the battery cells is realized. Because the battery module has the structure of the bus aluminum bar, the current overflow of the battery module can be improved, and the power generation power of the battery module is improved.

The embodiment also provides a battery pack, and the battery pack comprises the battery module, and the battery pack can save the manufacturing cost and improve the power generation power of the battery pack.

It is to be understood that the foregoing is only illustrative of the presently preferred embodiments of the invention and that the invention may be practiced using other techniques. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

It is noted that in the description herein, references to the description of "some embodiments," "other embodiments," or the like, are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A bus aluminum bar, comprising:

connecting portion (100), first extension (200) and second extension (300) extend respectively to the both sides of connecting portion (100), first extension (200) with all be provided with heavy groove (210) on second extension (300), heavy groove (210) are oval along its direction of height's projection.

2. The aluminum busbar according to claim 1, wherein the ratio of the major diameter of the sink groove (210) to the minor diameter of the sink groove (210) is N, wherein N is in the range of 1.0 < N.ltoreq.2.0.

3. The aluminum bus bar of claim 1, wherein the cross section of the sinking groove (210) along the major diameter direction thereof or the cross section of the sinking groove (210) along the minor diameter direction thereof is an inverted trapezoid.

4. A bus bar according to claim 1, wherein the bottom surface of the sink groove (210) is provided with a welding area (2101), the welding area (2101) is shaped as a circular racetrack, and the welding area (2101) is provided with an equal width.

5. The aluminum bus bar according to claim 4, wherein the bottom surface of the sinking groove (210) is provided with a blank area (2102), a projection of the blank area (2102) along a height direction of the sinking groove (210) is an ellipse, an outer edge of the blank area (2102) coincides with an inner edge of the welding area (2101), and the blank area (2102) and the welding area (2101) together constitute the bottom surface of the sinking groove (210).

6. The aluminum busbar according to claim 5, wherein a positioning through hole (2103) is formed in the margin area (2102), and the positioning through hole (2103) is arranged coaxially with the margin area (2102).

7. The aluminum bus bar of claim 1, wherein the connecting portion (100) is convex in a circular arc shape in a height direction of the sink groove (210).

8. The aluminum bus bar of claim 1, wherein the countersunk grooves (210) are formed by integral stamping.

9. A battery module, characterized in that the battery module comprises a plurality of battery cells and the aluminum busbar of any one of claims 1 to 8, the aluminum busbar being used for connecting two adjacent battery cells.

10. A battery pack, characterized in that the battery pack comprises a plurality of the battery modules according to claim 9.