Bridging busbar, battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a bridging busbar, a battery module and a battery pack. The two connecting parts are connected to the two sides of the bending part in the extending direction perpendicular to the bending part respectively, each connecting part comprises a first-layer base body connected with the bending part, and at least one connecting part comprises a second-layer base body and a third-layer base body which are stacked with the first-layer base body; the second-layer base body and the third-layer base body are formed by bending the first-layer base body and are respectively positioned on two sides of the first-layer base body, and the second-layer base body is used for connecting a pole of a battery cell. Through the arrangement of the first layer of substrate, the second layer of substrate and the third layer of substrate, the overcurrent area is increased, and the overcurrent capability of the bridging busbar is improved, so that the requirement of a high-rate discharge module is met. Through the arrangement of the first-layer base body and the second-layer base body, the force transmission distance is increased, force attenuation is improved, force buffering can be conducted through the bending part, and the risk that the bending part cracks is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a jumper busbar, a battery module and a battery pack. Background Art

[0002] With the development of technology, the application scope of power batteries is becoming wider and wider, involving production and life. In the past, when power batteries were used in groups, multiple power batteries were packaged to form a battery module or battery pack, and two or more adjacent power batteries were connected in series through a jumper busbar.

[0003] In the prior art, the deformation zone of the cross-connected busbar generally adopts a single-layer plate structure, which has a small flow area and poor flow capacity, and is difficult to meet the requirements of a high-rate discharge module. Utility Model Content

[0004] In order to solve the above technical problems, the present disclosure provides a jumper busbar, a battery module and a battery pack.

[0005] In a first aspect, the present disclosure provides a bridging busbar, comprising:

[0006] Bending part;

[0007] Two connecting parts are respectively connected to the two sides of the bending part along the extension direction perpendicular to the bending part, the connecting part includes a first layer substrate connected to the bending part, at least one of the connecting parts also includes a second layer substrate and a third layer substrate stacked with the first layer substrate, the second layer substrate and the third layer substrate are formed by bending the first layer substrate and are respectively located on both sides of the first layer substrate, and the second layer substrate is used to connect the poles of the battery cell.

[0008] Optionally, a stress relief notch is provided at at least one end of the bending portion in its extension direction.

[0009] Optionally, the second-layer substrate is formed by bending a side of the first-layer substrate away from the bending portion.

[0010] Optionally, the bending portion includes a plurality of continuous bending pieces.

[0011] Optionally, the bending portion includes at least one bending piece, and the cross-sectional area of ​​the bending piece in a direction perpendicular to the extension direction of the bending portion gradually increases from one side to the other side in the extension direction of the bending portion.

[0012] Optionally, the bending part includes a main body plate and two bending connecting plates respectively connected to both sides of the main body plate in an extension direction perpendicular to the bending portion, and the width of the main body plate in the extension direction perpendicular to the bending portion gradually increases from one side to the other side in the extension direction of the bending portion.

[0013] Optionally, the cross section of the bent portion perpendicular to its extension direction is arched.

[0014] Optionally, one of the connecting parts further includes a second layer substrate and a third layer substrate stacked with the first layer substrate, and the other connecting part further includes a second layer substrate stacked with the first layer substrate.

[0015] In a second aspect, the present disclosure provides a battery module, comprising the jumper busbar provided in the first aspect.

[0016] In a third aspect, the present disclosure provides a battery pack, comprising the jumper busbar provided in the first aspect or the battery module provided in the second aspect.

[0017] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0018] The connection part of the jumper busbar includes a first layer substrate connected to the bending part, and at least one connection part includes a second layer substrate and a third layer substrate stacked with the first layer substrate. The second layer substrate and the third layer substrate are formed by bending the first layer substrate and are respectively located on both sides of the first layer substrate. The second layer substrate is used to connect the poles of the battery cell. The arrangement of the first layer substrate, the second layer substrate and the third layer substrate increases the flow area and improves the flow capacity of the jumper busbar to meet the requirements of the high-rate discharge module.

[0019] In addition, when the jumper busbar is subjected to stress, the force transmission distance is increased by setting the first layer of substrate and the second layer of substrate, the force attenuation is improved, and the stress size of the bending portion is reduced; and the bending portion is used for buffering, thereby reducing the amplitude of the jumper busbar when subjected to vibration, improving the stress concentration problem of the bending portion, thereby reducing the risk of cracking of the bending portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a structural schematic diagram of the cross-connect busbar according to an embodiment of the present disclosure;

[0023] Figure 2 A schematic top view of the cross-connected busbar according to an embodiment of the present disclosure;

[0024] Figure 3 It is a cross-sectional schematic diagram of the cross-connected busbar according to the embodiment of the present disclosure;

[0025] Figure 4 It is a partial structural schematic diagram of another cross-connect busbar according to an embodiment of the present disclosure;

[0026] Figure 5 It is a schematic diagram of the connection between the battery cell and the jumper busbar described in an embodiment of the present disclosure.

[0027] Among them, 1, bending part; 11, bending piece; 111, main body plate; 112, bending connecting plate; 101, stress release notch;

[0028] 2. Connecting part; 21. First layer substrate; 211. Welding avoidance hole; 22. Second layer substrate; 221. Welding observation hole; 23. Third layer substrate;

[0029] 10. Battery cell. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0032] The embodiment of the present disclosure provides a jumper busbar, which is mainly used for connecting two battery cells 10 in series. Figures 1 to 3 As shown, the jumper busbar includes a bending portion 1 and two connecting portions 2 respectively connected to both sides of the bending portion 1 along an extension direction perpendicular to the bending portion 1, the connecting portion 2 includes a first layer substrate 21 connected to the bending portion 1, at least one connecting portion 2 also includes a second layer substrate 22 and a third layer substrate 23 stacked with the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 are formed by bending the first layer substrate 21 and are respectively located on both sides of the first layer substrate 21, and the second layer substrate 22 is used to connect the poles of the battery cell 10.

[0033] It can be understood that the jumper busbar, at least one connecting part 2 includes a second layer substrate 22 and a third layer substrate 23 stacked with the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 are formed by bending the first layer substrate 21 and are respectively located on both sides of the first layer substrate 21, the second layer substrate 22 is used to connect the poles of the battery cell, and the arrangement of the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 increases the flow area and improves the flow capacity of the jumper busbar to meet the requirements of the high-rate discharge module.

[0034] In addition, when the jumper busbar is subjected to stress, the force transmission distance is increased by the arrangement of the first layer substrate 21 and the second layer substrate 22, the force attenuation is improved, and the stress magnitude of the bending portion 1 is reduced; and the bending portion 1 is used for buffering, thereby reducing the amplitude of the jumper busbar when subjected to vibration, improving the stress concentration problem of the bending portion 1, thereby reducing the risk of cracking of the bending portion 1.

[0035] For example, in a specific implementation, referring to Figure 1 and Figure 2 The two connecting parts 2 each include a second layer substrate 22 and a third layer substrate 23 stacked with the first layer substrate 21 .

[0036] For example, in a specific implementation, referring to Figure 1 and Figure 3 The connecting part 2 may have a third-layer substrate 23; or, the connecting part 2 may also have a plurality of third-layer substrates 23, so as to further increase the flow area of ​​the connecting part 2, thereby further improving the flow capacity of the cross-connected busbar.

[0037] It should be noted that the volume of the third layer substrate 23 can be set according to actual needs, for example, the length and / or width of the third layer substrate 23 can be adjusted according to the required flow area.

[0038] Alternatively, in another specific implementation, one of the connecting parts further includes a second layer of substrate and a third layer of substrate stacked with the first layer of substrate, and the other connecting part further includes a second layer of substrate stacked with the first layer of substrate, that is, one connecting part has three layers of substrate, and the other connecting part has two layers of substrate. Alternatively, one of the connecting parts further includes a second layer of substrate and a third layer of substrate stacked with the first layer of substrate, and the other connecting part includes the first layer of substrate, that is, one connecting part has three layers of substrate, and the other connecting part has only one layer of substrate.

[0039] It should be noted that the first substrates 21 of the two connecting parts 2 are coplanar. In this way, when connecting the poles of two battery cells 10, it is possible to avoid the two battery cells 10 being misaligned due to different forces caused by the non-coplanar first substrates 21 of the two connecting parts 2, which is beneficial to improving the stability of the battery cell 10.

[0040] Reference Figure 1 and Figure 2 A welding avoidance hole 211 is opened on the first layer substrate 21 , and a welding observation hole 221 connected to the welding avoidance hole 211 is opened on the second layer substrate 22 .

[0041] Specifically, when the cross-connect busbar is used, the second layer of the base body 22 is welded to the pole of the battery cell 10 in the area of ​​the welding avoidance hole 211, and the welding process can be observed through the welding observation hole 221. Since only the second layer of the base body 22 is welded to the pole during welding, a low-power laser welding machine can be used to penetrate and weld.

[0042] For example, refer to Figure 1 The equivalent diameter of the welding avoidance hole 211 is larger than the equivalent diameter of the welding observation hole 221. This ensures that when the second layer substrate 22 is welded to the pole of the battery cell 10, the welding area is larger, thereby improving the welding stability of the second layer substrate 22 and the pole.

[0043] For example, in a specific implementation, the bending portion 1 and the two connecting portions 2 are an integrally formed structure, that is, the bending portion 1 and the two connecting portions 2 constituting the cross-connecting busbar are integrally formed, so that the cross-connecting busbar has good structural integrity and high structural strength. For example, the entire cross-connecting busbar is a sheet metal part, the bending portion 1 is formed by stamping, and the second layer substrate 22 and the third layer substrate 23 are formed by bending the first layer substrate 21. Alternatively, the bending portion 1 and the two connecting portions 2 can also be separately provided, and are connected by welding to form the cross-connecting busbar.

[0044] In some embodiments, the second layer substrate 22 is formed by bending the first layer substrate 21 at one side away from the bending portion 1. This increases the force transmission distance, effectively increases the force attenuation, and reduces stress concentration.

[0045] Optionally, in other embodiments, the second layer substrate 22 may be formed by bending one side of the first layer substrate 21 adjacent to the bending portion 1 .

[0046] In some embodiments, reference Figure 1 and Figure 2 The bending portion 1 is provided with a stress relief notch at at least one end thereof in its extension direction. The stress relief notch 101 can eliminate the stress concentration on the bending portion 1 during the processing of the cross-connecting busbar.

[0047] For example, in a specific implementation, the stress release notch 101 is located at one end of the bending portion 1 in its extension direction, and the two connecting portions 2 are respectively located on both sides of the bending portion 1 in the width direction, and the width direction of the bending portion 1 is perpendicular to its extension direction.

[0048] It should be noted that the specific position and size of the stress relief notch 101 can be set according to the stress simulation result of the cross-connected busbar.

[0049] In some embodiments, the bending portion 1 includes a plurality of continuous bending parts 11. By providing a plurality of continuous bending parts 11, the buffering effect of the bending portion 1 can be improved, so that when the bridging busbar is subjected to force or vibration, the plurality of continuous bending parts 11 can be used for buffering, thereby improving the problem that the bridging busbar is prone to cracking.

[0050] For example, in a specific implementation, a plurality of continuous bending parts 11 of the bending portion 1 form a wave-shaped structure. Figure 1 and Figure 3 The multiple continuous bending parts 11 of the bending portion 1 form an M-shaped structure.

[0051] Optionally, in some other embodiments, the cross section of the bent portion perpendicular to its extension direction is arched. With such arrangement, when the bridging busbar is subjected to force, the arched bent portion can buffer the force.

[0052] It can be understood that, compared with the case where the bending portion includes multiple continuous bends, the thickness of the bending portion at this time is greater than the thickness of the bending portion including multiple continuous bends, so as to ensure the structural strength of the bending portion and avoid cracking of the bending portion when subjected to force.

[0053] Exemplarily, in a specific implementation, the cross section of the bending portion perpendicular to its extension direction is arc-shaped.

[0054] Optionally, in other embodiments, referring to Figure 4 The bending portion 1 includes at least one bending piece 11, and the cross-sectional area of ​​the bending piece 11 perpendicular to the extending direction of the bending portion 1 gradually increases from one side of the bending portion 1 to the other side.

[0055] It can be understood that at this time, the cross-sectional area of ​​the bending part 11 is constantly changing in the extension direction of the bending portion 1. If there is only one bending part 11, the side with a larger cross-sectional area of ​​the bending part 11 can be set on the side where the bridging busbar is subjected to greater force in actual work, thereby enhancing the buffering effect of the bridging busbar on one side.

[0056] For example, in a specific implementation, referring to Figure 4 The above-mentioned bending part 11 includes a main body plate 111 and two bending connecting plates 112 respectively connected to both sides of the main body plate 111 in the extension direction perpendicular to the bending part 1. The width of the main body plate 111 in the extension direction perpendicular to the bending part 1 gradually increases from one side to the other side in the extension direction of the bending part 1.

[0057] It can be understood that at this time, the main plate 111 of the bending part 11 is trapezoidal. In specific use, the side of the main plate 111 with a larger width can be set on the side where the bridging busbar is subjected to greater force during actual work, thereby increasing the force attenuation and buffering effect and reducing stress concentration.

[0058] It should be noted that the above-mentioned bending part 11 can be formed by stamping, that is, the above-mentioned bending part 11 is formed by stamping on a metal plate processed into a bridging busbar.

[0059] When there are multiple bending pieces 11 , the sides of two adjacent bending pieces 11 with larger cross-sectional areas perpendicular to the extending direction of the bending portion 1 are respectively located on both sides of the extending direction of the bending portion 1 .

[0060] For the convenience of description, the side of the bending member 11 with a larger cross-sectional area perpendicular to the extension direction of the bending portion 1 is defined as the first side, and the side of the bending member 11 with a smaller cross-sectional area perpendicular to the extension direction of the bending portion 1 is defined as the second side. The first sides of two adjacent bending members 11 are respectively located on both sides of the extension direction of the bending portion 1, that is, the first side of one bending member 11 is adjacent to the second side of another adjacent bending member 11, which helps to maintain consistent buffering effect of the bending portion on both sides of its extension direction.

[0061] The present disclosure also provides a battery module, which includes the above-mentioned cross-connect busbar and a plurality of battery cells 10. Figure 5 As shown, two adjacent battery cells 10 are connected by a jumper busbar. Specifically, the battery cell 10 is a square battery cell, and multiple battery cells 10 are divided into multiple rows, and each row of battery cells 10 is arranged in sequence above the thickness direction of the battery cell 10, and multiple rows of battery cells 10 are arranged in sequence in the length direction of the battery cell 10. The jumper busbar is used to connect the positive poles or negative poles of two adjacent battery cells 10 in each row of battery cells 10, and at this time, the parallel connection of each row of battery cells 10 is realized. The jumper busbar can also be used to connect the positive pole of one battery cell 10 and the negative pole of the other battery cell 10 in each row of battery cells 10, that is, to realize the series connection of each row of battery cells 10.

[0062] The battery module adopts the above-mentioned jumper busbar. Since at least one connecting part 2 includes a second layer substrate 22 and a third layer substrate 23 stacked with the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 are formed by bending the first layer substrate 21 and are respectively located on both sides of the first layer substrate 21. The second layer substrate 22 is used to connect the poles of the battery cell. The arrangement of the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 increases the flow area, improves the flow capacity of the jumper busbar, and meets the requirements of the high-rate discharge module.

[0063] In addition, when the battery cell 10 expands and the cross-connected busbar is subjected to force, the arrangement of the first layer substrate 21 and the second layer substrate 22 increases the force transmission distance, improves the force attenuation, reduces the stress of the bending portion 1, and can also provide buffering through the bending portion 1, thereby reducing the amplitude of the cross-connected busbar when it is vibrated, improving the stress concentration problem of the bending portion 1, thereby reducing the risk of cracking of the bending portion 1.

[0064] The present disclosure also provides a battery pack. In some embodiments, the battery pack includes the above-mentioned battery module. In this case, the battery pack is composed of multiple battery modules. The battery module of the battery pack adopts the above-mentioned cross-connect busbar. Since at least one connecting portion 2 includes a second layer substrate 22 and a third layer substrate 23 stacked with the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 are formed by bending the first layer substrate 21 and are respectively located on both sides of the first layer substrate 21. The second layer substrate 22 is used to connect the pole of the battery cell. The arrangement of the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 increases the flow area, improves the flow capacity of the cross-connect busbar, and meets the requirements of the high-rate discharge module.

[0065] In addition, when the battery cell 10 expands and the cross-connected busbar is subjected to force, the arrangement of the first layer substrate 21 and the second layer substrate 22 increases the force transmission distance, improves the force attenuation, reduces the stress of the bending portion 1, and can also provide buffering through the bending portion 1, thereby reducing the amplitude of the cross-connected busbar when it is vibrated, improving the stress concentration problem of the bending portion 1, thereby reducing the risk of cracking of the bending portion 1.

[0066] Alternatively, in other embodiments, the battery pack may also include the above-mentioned jumper busbar. In this case, the battery pack may be directly composed of a plurality of battery cells 10, thereby achieving de-modularization of the battery.

[0067] Specifically, the battery cells 10 are square battery cells, and the multiple battery cells 10 are divided into multiple rows. The jumper busbar is used to connect the positive poles or negative poles of two adjacent battery cells 10 in each row of battery cells 10, thereby realizing the parallel connection of each row of battery cells 10. The jumper busbar can also be used to connect the positive pole of one battery cell 10 and the negative pole of the other battery cell 10 in each row of battery cells 10, thereby realizing the series connection of each row of battery cells 10.

[0068] The battery pack adopts the above-mentioned jumper busbar. Since at least one connecting part 2 includes a second layer substrate 22 and a third layer substrate 23 stacked with the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 are formed by bending the first layer substrate 21 and are respectively located on both sides of the first layer substrate 21. The second layer substrate 22 is used to connect the poles of the battery cell. The arrangement of the first layer substrate 21, the second layer substrate 22 and the third layer substrate 23 increases the flow area, improves the flow capacity of the jumper busbar, and meets the requirements of the high-rate discharge module.

[0069] In addition, when the battery cell 10 expands and the cross-connected busbar is subjected to force, the arrangement of the first layer substrate 21 and the second layer substrate 22 increases the force transmission distance, improves the force attenuation, reduces the stress of the bending portion 1, and can also provide buffering through the bending portion 1, thereby reducing the amplitude of the cross-connected busbar when it is vibrated, improving the stress concentration problem of the bending portion 1, thereby reducing the risk of cracking of the bending portion 1.

[0070] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0071] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bridging busbar, characterized in that: include: Bending part; Two connecting parts are respectively connected to the two sides of the bending part along the extension direction perpendicular to the bending part, the connecting part includes a first layer substrate connected to the bending part, at least one of the connecting parts also includes a second layer substrate and a third layer substrate stacked with the first layer substrate, the second layer substrate and the third layer substrate are formed by bending the first layer substrate and are respectively located on both sides of the first layer substrate, and the second layer substrate is used to connect the poles of the battery cell.

2. The crossover busbar according to claim 1, characterized in that: At least one end of the bending portion in its extending direction is provided with a stress release notch.

3. The crossover busbar according to claim 1, characterized in that: The second layer substrate is formed by bending a side of the first layer substrate away from the bending portion.

4. The bridging busbar according to claim 1, characterized in that: The bending portion includes a plurality of continuous bending pieces.

5. The jumper busbar according to claim 1, characterized in that: The bending portion includes at least one bending piece, and the cross-sectional area of ​​the bending piece in a direction perpendicular to the extension direction of the bending portion gradually increases from one side to the other side in the extension direction of the bending portion.

6. The bridging busbar according to claim 5, characterized in that: The bending part includes a main body plate and two bending connecting plates respectively connected to both sides of the main body plate in a direction perpendicular to the extension of the bending portion. The width of the main body plate in a direction perpendicular to the extension of the bending portion gradually increases from one side to the other side in the extension direction of the bending portion.

7. The jumper busbar according to any one of claims 1 to 5, characterized in that: The cross section of the bent portion perpendicular to the extending direction thereof is arched.

8. The crossover busbar according to claim 1, characterized in that: One of the connection parts further includes a second layer substrate and a third layer substrate stacked with the first layer substrate, and the other connection part further includes a second layer substrate stacked with the first layer substrate.

9. A battery module, characterized in that: Comprising the jumper busbar as described in any one of claims 1-8.

10. A battery pack, characterized in that: It comprises the jumper busbar as described in any one of claims 1 to 8 or the battery module as described in claim 9.

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