CN217427020U - Busbar, battery pack and vehicle - Google Patents

Abstract

The application provides a bus bar, a battery pack and a vehicle, wherein the bus bar comprises a plurality of connecting parts which are arranged in an array, and each connecting part is used for connecting a battery; the groove is positioned between at least two adjacent connecting parts; the grooves comprise a first groove and a second groove which are intersected; wherein, along the direction of keeping away from the meeting point of first recess and second recess, the width of at least one recess in first recess and the second recess narrows gradually. In above-mentioned technical scheme, adopt the mode of width gradual change through first recess and second recess to divide the power born to other directions, anti inflation effect is better.

Description

Busbar, battery pack and vehicle

Technical Field

The present application relates to the field of batteries, and in particular, to a bus bar, a battery pack, and a vehicle.

Background

With the popularization of electric vehicles, the battery is more and more regarded as a power source part of the electric vehicle, and the safety of the battery relates to the safety of the whole vehicle. At present, the electric vehicle adopts CTP (Cell to Pack, no module power battery Pack) to pile up the whole battery Pack. In the CTP, a double-row battery pack is generally used, and when the electrical connection is realized, the two rows of battery packs are connected through a bus bar to realize the electrical connection, and meanwhile, the same row of batteries are connected through the bus bar.

However, the electric vehicle inevitably causes vibration of the battery pack during operation, and in addition, the battery pack generates thermal expansion during use, so that the bus bar is subjected to great force and is easily stressed to generate fatigue damage.

Disclosure of Invention

The application provides a busbar, battery package and car for improve the structural strength of busbar, reduce the influence of atress to the busbar.

The application provides a bus bar, which comprises a plurality of connecting parts arranged in an array, wherein each connecting part is used for connecting a battery; the groove is positioned between at least two adjacent connecting parts; the grooves comprise a first groove and a second groove which are intersected; wherein the width of at least one of the first and second grooves gradually narrows in a direction away from a meeting point of the first and second grooves. In above-mentioned technical scheme, adopt the mode of width gradual change through first recess and second recess to divide the power born to other directions, anti inflation effect is better.

The application also provides a battery pack, which comprises batteries arranged in an array and the bus bar of any one of the above items; wherein, the connecting parts are connected with the batteries in a one-to-one correspondence manner. In above-mentioned technical scheme, adopt the mode of width gradual change through first recess and second recess to divide the power born to other directions, anti inflation effect is better.

The application also provides a vehicle, which comprises a vehicle body and a battery pack connected with the vehicle body. In above-mentioned technical scheme, adopt the mode of width gradual change through first recess and second recess to divide the power born to other directions, anti inflation effect is better.

Drawings

Fig. 1 is a schematic view of an application scenario of a bus according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a bus bar according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of an array arrangement of cells;

FIG. 4 shows another arrangement of the cells in an array;

FIG. 5 is a top view of a buss bar provided in an embodiment of the present application;

fig. 6 is a partial cross-sectional view of a bus bar provided in an embodiment of the present application.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The "plurality" in the embodiments of the present application refers to at least two, two or more, and the like, unless otherwise specified.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not conflict with each other.

To facilitate understanding of the bus provided in the embodiments of the present application, an application scenario of the bus is first described. Referring to fig. 1, a bus bar 10 provided in the embodiment of the present application is used to connect different batteries 20 in a battery pack. When the battery 20 is assembled into a battery pack, a plurality of batteries 20 are arranged side by side to form an array, and the plurality of batteries 20 in the battery pack are connected in series or in parallel through the bus bar 10. When the battery pack is used, the battery pack is easily heated and expands, so that the distance between the batteries 20 changes, which inevitably affects the bus bar 10 connecting the plurality of batteries 20, and the bus bar 10 is subjected to a large stress. Therefore, the embodiment of the present application provides a bus bar 10 to improve the stress of the bus bar 10. The following detailed description is made with reference to the specific drawings and examples.

First, a battery pack is described, and the battery pack in the embodiment of the present application includes a plurality of battery modules, each of which includes a single-row battery or a double-row battery. The bus bar provided by the embodiment of the application can be applied to a battery pack or a battery module. For example, when the battery module has double rows of batteries, the bus bar provided by the embodiment of the present application can also be applied to the battery module.

Referring to fig. 2, fig. 2 shows a schematic structural diagram of a bus bar provided in an embodiment of the present application. The main structure of the bus bar 10 provided by the embodiment of the present application is a plate-shaped structure, and a plurality of connecting portions 11 are disposed on the plate-shaped structure, wherein each connecting portion 11 is used for correspondingly connecting a positive electrode or a negative electrode of one battery. When the batteries in the battery pack are arranged in an array, the corresponding connecting parts 11 are also arranged in an array, so that the connecting parts 11 correspond to the batteries one by one.

Referring to fig. 3 and 4 together, fig. 3 and 4 illustrate different array modes, and the array in this application can refer to an array in which the cells 20 are arranged in a horizontal, vertical, row-column manner (shown in fig. 3), or an array in which the cells 20 are arranged in an oblique manner (shown in fig. 4), although other modified array modes can be applied to the embodiment of this application. It should be understood that fig. 3 and 4 merely illustrate the arrangement of the cells 20, and do not actually represent the arrangement pitch between the cells 20 and 20. When the cells 20 are arrayed in different manners, the corresponding plurality of connection portions are also arranged in the same array manner.

The bus bar 10 has a rectangular plate-shaped structure as a whole, but it should be understood that the bus bar 10 in the present application may have other shapes, such as an oval plate shape, a circular plate shape, and other different shapes, and is not limited in the present application.

The connecting portion 11 is a structure that is engaged with the battery and has a substantially rectangular shape, but when the overall shape of the busbar 10 is changed, the shape of the corresponding connecting portion 11 may be changed adaptively, and will not be described in detail herein.

The bus bar 10 according to the embodiment of the present disclosure includes four connecting portions 11, which are named as a first connecting portion 111, a second connecting portion 112, a third connecting portion 113, and a fourth connecting portion 114 for convenience of description. The first connection portion 111 and the second connection portion 112 are used for corresponding connection with the batteries in the same row of batteries, and the third connection portion 113 and the fourth connection portion 114 are used for corresponding connection with the batteries in the other row of batteries. It should be understood that, in the embodiment of the present application, although four connection portions 11 are illustrated, six, eight, etc. different connection portions 11 may be adopted as the connection portions 11 in the busbar 10 in the embodiment of the present application, and specifically, the number of batteries to be connected may correspond to the actual requirement.

As an alternative, a positioning hole 110 is provided on each connecting portion 11. When the busbar 10 is connected with a battery, the connecting part 11 is usually welded and fixed on a battery pole, and the arranged positioning hole 110 can be used as a welding observation hole, so that the position relation between the battery and the connecting part 11 can be observed conveniently in the welding process of the battery and the connecting part, the welding condition can be observed, and welding deviation can be avoided. The positioning hole 110 is usually required to be provided when welding is performed manually, but the positioning hole 110 may not be provided when automatic welding is performed by a machine.

In order to improve the stress generated when the battery pack deforms in the bus bar 10, the bus bar 10 provided in the embodiment of the present application further includes a plurality of grooves, and the grooves are disposed between at least two adjacent connecting portions 11. For example, taking the first connection portion 111, the second connection portion 112, the third connection portion 113, and the fourth connection portion 114 as an example, grooves are disposed between the first connection portion 111 and the second connection portion 112, between the first connection portion 111 and the third connection portion 113, between the second connection portion 112 and the fourth connection portion 114, and between the third connection portion 113 and the fourth connection portion 114, so as to isolate the connection portions 11 corresponding to different batteries in the same row and isolate the connection portions 11 corresponding to batteries in different rows.

For convenience of description, the grooves are divided into a first groove 13 and a second groove 12, wherein the first groove 13 separates the connection parts 11 for connecting different rows of batteries, and the second groove 12 separates the connection parts 11 for connecting different batteries in the same row of batteries. Exemplarily, two first recesses 13 and two second recesses 12 are shown in fig. 2. One of the first grooves 13 separates the first connection portion 111 and the third connection portion 113, and the other first groove 13 separates the second connection portion 112 and the fourth connection portion 114; one of the second grooves 12 separates the first connection portion 111 and the second connection portion 112, and the other second groove 12 separates the third connection portion 113 and the fourth connection portion 114.

The first groove 13 and the second groove 12 meet, and the division of the first groove 13 and the second groove 12 is performed according to a meeting point. The meeting point shown in fig. 3 is O, and the two first grooves 13 are separated by the meeting point O, and their lengths are respectively along the direction away from the point O, and similarly, the two second grooves 12 are also divided in the same way. The two first grooves 13 and the two second grooves 12 form an X-shaped groove structure, and separate the four connecting portions 11. It should be understood that when the connecting portions 11 are provided in different numbers of six, eight, ten, etc., the corresponding numbers of the first grooves 13 and the second grooves 12 are also correspondingly increased to form other types of groove structures for communication.

As an alternative, the first recess 13 and the second recess 12 intersect in a cross. That is, the center line of the first groove 13 and the center line of the second groove 12 are perpendicular to each other, so that the connection part forms a regular rectangular structure to be matched with the battery. Of course, other alternatives are also possible in the embodiment of the present application, such as the first groove 13 and the second groove 12 intersecting in a non-perpendicular manner, as long as the adjacent connecting portions 11 can be separated.

Referring also to fig. 5, fig. 5 shows a top view of the buss bar. For convenience of description, an XY coordinate system is established with an intersection O of the first groove 13 and the second groove 12 as a center, where an X direction is an extending direction of the first groove 13, a Y direction is an extending direction of the second groove 12, and an XY plane is parallel to a plane on which the first groove 13 and the second groove 12 are provided on the busbar 10.

The first groove 13 is a narrow groove, and the width of the first groove is gradually narrowed in a direction away from the intersection O of the first groove 13 and the second groove 12. Referring to the established reference coordinate system, the width of the first groove 13 is narrower as it is farther from the point O in the X direction.

The first groove 13 may take different width gradually-changing forms, and the side wall of the first groove 13 is a straight side wall or an arc side wall, for example. Taking the sidewall of the first groove 13 as a straight sidewall as an example, in the plan view shown in fig. 2, the overall shape of the first groove 13 is a trapezoid. When the side wall of the first groove 13 is an arc-shaped side wall, the concave direction of the arc-shaped side wall may face away from the first groove 13. Of course, the side walls of the first recess 13 may also be of other types than the straight or curved side walls described above, such as side walls in the form of a parabola. When a straight side wall is adopted, the first groove 13 can be conveniently prepared, and when an arc-shaped or parabolic side wall is adopted, the force can be better dispersed.

Specifically, the side wall of the first groove 13 is inclined with respect to the center line of the first groove 13, and the inclination angle of the side wall of the first groove 13 with respect to the center line of the first groove 13 is greater than 0 ° and equal to or less than 45 °. The side wall of the first groove 13 is a straight side wall, the included angle between the straight side wall and the center line of the first groove 13 is alpha (the included angle alpha is exemplified by a line A parallel to the center line of the first groove 13 as a reference line in FIG. 5), 0 DEG & lt alpha & lt, 45 DEG, for example, alpha is different angles such as 10 DEG, 20 DEG, 30 DEG, 45 deg and the like. When the first side wall is an arc-shaped side wall, the inclination angle of the side wall of the first groove 13 relative to the center line of the first groove 13 is the angle of the included angle between the connection of the end points at the two ends of the side wall of the first groove 13 and the center line of the first groove 13. The angle of the included angle also satisfies the definition of greater than 0 DEG and equal to or less than 45 deg. When first recess 13 adopts the angle of above-mentioned slope, the power that transmits to the busbar that can make can better dispersion, if adopt less angle, then 13 lateral walls of first recess are similar to straight lateral wall, can cause the power dispersion effect to reduce, if adopt great inclination, then the size of connecting portion 11 can be influenced to the first recess 13 that sets up, influence be connected with the battery.

When the first groove 13 is specifically provided, two sidewalls of the first groove 13 may be symmetrically or asymmetrically arranged with respect to a center line of the first groove 13. Taking a symmetrical arrangement as an example, two side walls of the first groove 13 may be both straight side walls or both arc side walls; taking an asymmetric manner as an example, one side wall of the first groove 13 is a straight side wall, the other side wall is an arc side wall, or both the two side walls are straight side walls, but the inclination angles of the straight side walls are different; or both sidewalls may be curved, but the curvature of the two sidewalls may be different.

No matter the gradual change mode of any shape is adopted to first recess 13, the whole shape of first recess 13 is a similar trapezoidal recess, can divide the power that bears to other directions through the lateral wall of first recess 13 slope to improve the structural strength of whole busbar 10, and then make busbar 10 anti inflation effect better.

It should be understood that, in addition to the above-disclosed grooves with gradually changed widths, the first grooves 13 provided in the embodiments of the present application may also be grooves with other shapes, for example, the first grooves 13 are rectangular grooves, and may also be applied in the embodiments of the present application.

The shape of the second groove 12 is similar to that of the first groove 13, and a trapezoidal structure may be adopted, and the specific structural form thereof may refer to the structure of the first groove 13, which will not be described in detail herein.

When the bus bar 10 disclosed in the present application includes the first groove 13 and the second groove 12, at least one of the grooves is a groove having a gradually changing width. Illustratively, the first groove 13 is a groove with gradually changed width, and the second groove 12 is a rectangular groove; or, the first groove 13 is a rectangular groove, and the second groove 12 is a groove with gradually changed width; alternatively, the first groove 13 and the second groove 12 are both grooves with gradually changing widths.

When the busbar 10 is used, a large stress is generated at the intersection of the first groove 13 and the second groove 12, and for this reason, a chamfer 14 is provided at the intersection of the side wall of the first groove 13 and the side wall of the second groove 12. With continued reference to fig. 5, the first groove 13 and the second groove 12 form a recessed region 15 at the intersection, the sidewalls of the first groove 13 and the sidewalls of the second groove 12 meet at the recessed region 15, and a chamfer 14 is located at the intersection of the sidewalls of the first groove 13 and the sidewalls of the second groove 12 to reduce stress concentration by the chamfer 14. Illustratively, the chamfer 14 is a circular arc chamfer, and the stress concentration is reduced by the circular arc chamfer, so that the structural strength of the busbar 10 is improved. Of course, other shapes, such as parabolic or other shapes, may be used instead of the circular chamfer, but not limited thereto.

As an alternative, a smooth transition is formed at the junction of the chamfer 14 and the side wall of the first groove 13 and the side wall of the second groove 12, so as to avoid the generation of a pointed bulge at the position of intersection and the generation of stress concentration.

With continued reference to fig. 2, when the width of the first groove 13 is gradually changed, the minimum width of the first groove 13 may be greater than or equal to twice the thickness of the connecting portion 11. Specifically, the minimum width of the first groove 13 is L1, and the thickness of the connecting part 11 is d3, so that L1 is not less than 2 × d 3. When the above structure is adopted, the first groove 13 is made to have a sufficient width to provide a good buffering effect, and the influence of the force generated by the expansion of the battery on the bus bar 10 is reduced.

The minimum width of the second groove 12 is L2, and L2 ≧ 2 × d3 can also be used as the minimum width of the second groove 12.

It is to be understood that, when the first groove 13 and the second groove 12 are specifically provided, the thickness of the connecting portion 11 may be two times or more as long as the minimum width of at least one of the first groove 13 and the second groove 12. Illustratively, only the minimum width of the first groove 13 is greater than or equal to twice the thickness of the connecting part 11, namely L1 ≧ 2 × d 3; or the minimum width of the second groove 12 is more than or equal to two times of the thickness of the connecting part 11, namely L2 is more than or equal to 2 x d 3; alternatively, the minimum width of the first groove 13 and the minimum width of the second groove 12 are both greater than or equal to twice the thickness of the connecting part 11, namely, L1 ≧ 2 × d3, and L2 ≧ 2 × d 3.

As an alternative, since the first groove 13 is used to isolate the batteries in different rows and the second groove 12 is used to isolate two adjacent batteries in the same row, when the first groove 13 and the second groove 12 are provided, the width of the first groove 13 is greater than that of the second groove 12, so that the first groove 13 having a larger size can be provided with a larger gap between the batteries in different rows. It should be understood that the above-mentioned width of the first groove 13 being larger than the width of the second groove 12 means that the second groove 12 can be nested in the first groove 13 if the first groove 13 can be stacked with the second groove 12. Alternatively, it is also understood that when the perpendicular projection of the second groove 12 on a surface is layered with the perpendicular projection of the first groove 13 on the same surface, the perpendicular projection of the second groove 12 may be located within the range of the edge of the perpendicular projection of the first groove 13.

Referring to fig. 6, fig. 6 shows a partial cross-sectional view of a bus bar. The depth of the first groove 13 is d1, and the depth of the first groove 13 refers to the distance from the installation surface of the first groove 13 to the bottom of the first groove 13; the depth of the second groove 12 is d2, and the depth of the second groove 12 refers to the distance from the installation surface of the second groove 12 to the bottom of the second groove 12; the thickness of the connection part 11 is d3, and the thickness of the connection part 11 is the thickness between the surface of the connection part 11 in contact with the battery and the opposite surface.

When the first groove 13 is provided specifically, at least one of the first groove 13 and the second groove 12 has a depth larger than the thickness of each of the connecting portions 11. Illustratively, the depth of each of the first groove 13 and the second groove 12 is greater than the thickness of the connecting part 11, i.e., d1 > d3, d2 > d 3; or only the depth of the first groove 13 is greater than the thickness of the connecting part 11, namely d1 is greater than d3, and d2 is less than or equal to d 3; or, only the depth of the second groove 12 is larger than the thickness of the connecting part 11, namely d1 is not more than d3, and d2 is more than d 3. As an alternative, in the embodiment of the present application, the depth of each of the first groove 13 and the second groove 12 is greater than the thickness of the connecting portion 11. The depth of the first groove 13 and the depth of the second groove 12 are not limited in detail, and d1 ≧ d2 or d1 < d2 can be used.

When the depth of at least one groove is larger than the thickness of the connecting part 11, the groove can have a good buffering effect, and the influence of the force generated by the expansion of the battery on the bus bar 10 is reduced.

As can be seen from the above examples, the bus bar 10 provided in the embodiment of the present application adopts a mode of gradually changing the width through the first groove 13 and the second groove 12, so that the borne force is divided into other directions, and the expansion resistance effect is better. In addition, the stress concentration can be reduced more effectively by the chamfer 14, and the structural strength of the busbar 10 can be improved.

It should be understood that the case where the groove is provided between any two of the connection portions 11 is exemplified in fig. 2 and 5, but in the present embodiment, the groove may be provided only partially between the adjacent connection portions. A groove is provided between some of the connecting portions as in the present application, while no groove is provided between other adjacent connecting portions. For example, when the number of the connecting portions is different from six, eight, etc., the first groove or the second groove may be provided only between some adjacent connecting portions, or the first groove and the second groove may be provided between any adjacent connecting portions. The different arrangements described above can be applied to the embodiments of the present application. In addition, when the number of the first grooves and the second grooves is multiple, only part of the grooves can be the grooves with gradually changed width, and all the grooves can also be the grooves with gradually changed width.

The embodiment of the application also provides a battery module, which comprises batteries arranged in an array and any one bus bar; the connecting parts are connected with the batteries in a one-to-one correspondence manner; the first groove and the second groove are positioned above the adjacent batteries and are recessed towards the two batteries. The structure of the bus bar can refer to the description above, when the bus bar is connected with the battery, the stress of the bus bar is improved through the first groove and the second groove, namely, the first groove and the second groove adopt a mode of gradually changing the width, so that the borne force is distributed to other directions, and the anti-expansion effect is better.

The embodiment of the application also provides a battery pack, which comprises batteries arranged in an array and any one of the busbars; the connecting parts are connected with the batteries in a one-to-one correspondence manner; the first groove and the second groove are positioned above the adjacent batteries and are recessed towards the two batteries. The structure of the bus bar can refer to the description above, when the bus bar is connected with the battery, the stress of the bus bar is improved through the first groove and the second groove, namely, the first groove and the second groove adopt a mode of gradually changing the width, so that the borne force is distributed to other directions, and the anti-expansion effect is better.

The embodiment of the application can also provide a vehicle, and the vehicle comprises a vehicle body and a battery pack connected with the vehicle body. Illustratively, the battery pack is disposed within the vehicle body and powers a motor of the vehicle. In addition, the battery pack can be connected with the vehicle body in other modes, and the embodiment of the application is not particularly limited and only needs to supply power to the motor. The structure of the bus bar can refer to the description above, when the bus bar is connected with the battery, the stress of the bus bar is improved through the first groove and the second groove, namely, the first groove and the second groove adopt a mode of gradually changing the width, so that the borne force is distributed to other directions, and the anti-expansion effect is better.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on operational states of the present application, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application.

In the description of the present application, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise explicitly stated or limited. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

The present application has been described above with reference to preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the present application can be subjected to various substitutions and modifications, which are all within the scope of protection of the present application.

Claims (10)

1. The bus bar is characterized by comprising a plurality of connecting parts arranged in an array, wherein each connecting part is used for connecting a battery; the groove is positioned between at least two adjacent connecting parts; the grooves comprise a first groove and a second groove which are intersected; wherein the content of the first and second substances,

the width of at least one of the first groove and the second groove gradually narrows in a direction away from a meeting point of the first groove and the second groove.

2. The buss bar of claim 1, wherein the sidewalls of the first recess and the sidewalls of the second recess are chamfered at the intersection.

3. The buss bar of claim 2, wherein the chamfer is a circular arc chamfer.

4. The buss bar of claim 1, wherein a depth of at least one of the first and second recesses is greater than a thickness of each of the connections.

5. The busbar according to claim 4, wherein a minimum width of the first groove is equal to or greater than twice a thickness of the connecting portion; and/or the presence of a gas in the atmosphere,

the minimum width of the second groove is larger than or equal to two times of the thickness of the connecting part.

6. The busbar according to any one of claims 1 to 5, wherein the side wall of the first groove is inclined with respect to the center line of the first groove, and the inclination angle of the side wall of the first groove with respect to the center line of the first groove is greater than 0 ° and equal to or less than 45 °; and/or the presence of a gas in the gas,

the side wall of the second groove inclines relative to the center line of the second groove, and the inclination angle of the side wall of the second groove relative to the center line of the second groove is greater than 0 degree and less than or equal to 45 degrees.

7. The buss bar of claim 6, wherein the sidewalls of the first recess are straight sidewalls or curved sidewalls; and/or the presence of a gas in the gas,

the side wall of the second groove is a straight side wall or an arc side wall.

8. The busbar according to claim 6, wherein each of the connecting portions is provided with a positioning hole.

9. A battery pack comprising batteries arranged in an array and the bus bar of any one of claims 1 to 8; wherein the content of the first and second substances,

the connecting parts are connected with the batteries in a one-to-one correspondence manner.

10. A vehicle characterized by comprising a vehicle body and the battery pack according to claim 9 attached to the vehicle body.

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