Busbar, busbar assembly and battery pack

Abstract

The application provides a busbar, a bus assembly and a battery pack. The busbar comprises a metal layer and a first insulating layer; the metal layer has a first surface configured to face a battery module of the battery pack, the first surface comprising an isolation area and a connection area; the first insulating layer is arranged in the isolation area; the first insulating layer is configured to be thermally coupled with the battery module, and the connection area is configured to be connected with at least two battery modules of the battery pack. The application can transmit the heat of the battery module to the metal layer through the first insulating layer to dissipate the heat through the metal layer; and by arranging the metal layer as a bridging component between the battery modules, the metal layer has a large surface area, which is conducive to increasing the heat dissipation area of the busbar, and the path of heat conduction from the first insulating layer to the side of the busbar away from the battery module is shortened, so that the heat of the battery module can be more quickly conducted to the surrounding environment. In this way, the heat dissipation efficiency of the battery pack can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a busbar, a busbar assembly, and a battery pack. Background Technology

[0002] In related technologies, a battery pack includes multiple battery modules, and each battery module includes multiple rows of cells. Each row of cells includes multiple cells arranged in an array. The cells in each row of cells are connected via a busbar. Multiple rows of cells in each battery module are connected in parallel via a busbar (also known as the module output stage). Adjacent battery modules are connected in series or in parallel via a busbar.

[0003] Because battery cells generate heat during operation, a liquid cooling plate is needed to keep the battery pack operating at a suitable temperature and ensure its stability. However, relying on a liquid cooling plate for heat dissipation is relatively inefficient. Utility Model Content

[0004] Embodiments of this application provide a busbar, a bus assembly, and a battery pack, which can improve the heat dissipation efficiency of the battery pack.

[0005] In a first aspect, embodiments of this application provide a busbar applied to a battery pack. The busbar includes a metal layer and a first insulating layer. The metal layer has a first surface configured to face the battery modules of the battery pack. The first surface includes an isolation region and a connection region. The first insulating layer is disposed in the isolation region. The first insulating layer is configured to be thermally coupled to the battery modules, and the connection region is configured to be connected to at least two battery modules of the battery pack.

[0006] In one embodiment, the first insulating layer covers the isolation area.

[0007] In one embodiment, the metal layer has a width dimension, and an isolation region and a connection region are sequentially arranged along the direction of the width dimension.

[0008] In one embodiment, the connection area is configured to be located on the side of the isolation area near the edge of the battery module.

[0009] In one embodiment, a portion of the edge of the first insulating layer extends beyond the edge of the metal layer.

[0010] In one embodiment, a portion of the edge line of the connection region coincides with a portion of the edge line of the metal layer, and the edge of the first insulating layer extends beyond the remaining edge line of the metal layer.

[0011] In one embodiment, the busbar further includes a second insulating layer, the metal layer having a second surface opposite to the first surface, the second surface including a first region and a second region respectively disposed opposite to the isolation region and the connection region, the second insulating layer being disposed in the first region.

[0012] In one embodiment, the busbar is provided with a positioning hole that penetrates the first insulating layer and the metal layer.

[0013] In one embodiment, a weight-reduction hole is provided in the connection area, and the weight-reduction hole is configured to be located between two adjacent battery modules.

[0014] Secondly, embodiments of this application provide a busbar assembly, which includes a module output stage and the aforementioned busbar; there are multiple module output stages, and the multiple module output stages are configured to be connected to multiple battery modules respectively; wherein, one side of the module output stage is connected to a connection area, and the other side is configured to be connected to a battery module.

[0015] In one embodiment, the bus assembly further includes multiple metal plates, each corresponding to a multiple module output stage. The metal plates are located between the connection area and the corresponding module output stage, and both sides of the metal plates are connected to the connection area and the corresponding module output stage, respectively.

[0016] In one embodiment, a metal plate is configured to be located on one side of the battery module along the radial direction of the battery cell; the module output stage includes an inner connection portion, a bending portion and an outer connection portion connected in sequence, the inner connection portion is configured to be connected to the corresponding battery module, the outer connection portion is connected to the metal plate, and the bending portion is bent such that at least a portion of the outer connection portion is configured to be disposed opposite to the battery cell along the radial direction of the battery cell.

[0017] In one embodiment, the thickness of the metal plate is greater than the thickness of the module output stage and the thickness of the busbar; and / or, the metal plate is a copper plate.

[0018] Thirdly, embodiments of this application provide a battery pack, which includes battery modules and the aforementioned busbar assembly; there are multiple battery modules arranged in parallel; multiple module output stages are respectively connected to the battery modules, and along the axial direction of the battery cells of the battery modules, the module output stages are located on one side of the battery modules; the busbar is located on the side of the module output stages away from the battery modules, and the first insulating layer is thermally coupled to the battery modules.

[0019] In one embodiment, a thermally conductive adhesive is disposed between the first insulating layer and the battery module, and the first insulating layer is bonded to the battery module by the thermally conductive adhesive.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] In the embodiments of this application, by thermally coupling the first insulating layer to the battery module, heat from the battery module can be transferred to the metal layer through the first insulating layer for heat dissipation. Furthermore, by using the metal layer as a bridging component between battery modules, not only does the metal layer have a larger surface area, thus increasing the heat dissipation area of ​​the busbar, but it also shortens the path of heat conduction from the first insulating layer to the side of the busbar away from the battery module, allowing heat from the battery module to be conducted to the surrounding environment more quickly. This improves the heat dissipation efficiency of the battery module, thereby enhancing the heat dissipation efficiency of the battery pack. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the first type of busbar provided in the embodiments of this application;

[0024] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0025] Figure 3 This is a schematic diagram of the structure of the first surface provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure of the second type of busbar provided in the embodiments of this application;

[0027] Figure 5 This is a schematic diagram of the structure of the bus component provided in an embodiment of this application;

[0028] Figure 6 This is a side view of the bus assembly provided in an embodiment of this application;

[0029] Figure 7 yes Figure 6 Enlarged structural diagram at point B;

[0030] Figure 8 A partial structural diagram of the battery pack provided in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10-Busbar; 11-First insulation layer; 12-Second insulation layer;

[0033] 13-Metal layer; 131-First surface; 1311-Isolation area; 1312-Connection area; 132-Second surface; 1321-First region; 1322-Second region; 133-Positioning hole; 134-Weight reduction hole;

[0034] 20 - Busbar assembly; 21 - Module output stage; 211 - Internal connection part; 212 - Bending part; 213 - External connection part; 22 - Metal plate;

[0035] 30-Battery pack; 31-Battery module; 311-Battery cell; 312-Connector bar. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0040] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0041] The following combination Figures 1 to 8 The embodiments of this application provide a detailed description of a busbar 10, a busbar assembly 20, and a battery pack 30.

[0042] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of the first type of busbar 10 provided in the embodiments of this application. Figure 2 yes Figure 1 Enlarged structural diagram at point A in the middle. Figure 3 This is a schematic diagram of the structure of the first surface 131 provided in an embodiment of this application. In a first aspect, an embodiment of this application provides a busbar 10 applied to a battery pack 30. The busbar 10 includes a metal layer 13 and a first insulating layer 11. The metal layer 13 has a first surface 131. The first surface 131 is configured to face the battery modules 31 of the battery pack 30. The first surface 131 includes an isolation region 1311 and a connection region 1312. The first insulating layer 11 is disposed in the isolation region 1311. The first insulating layer 11 is configured to be thermally coupled to the battery modules 31. The connection region 1312 is configured to connect to at least two battery modules 31 of the battery pack 30.

[0043] The connection between the connection area 1312 and the battery module 31 is an electrical connection. Thermal coupling refers to the transfer of heat between the first insulating layer 11 and the battery module 31 (e.g., battery cells 311, series rows, parallel rows) through a heat transfer mechanism.

[0044] For example, the metal layer 13 can be a 1060 series aluminum sheet, such as a 1060-H24 aluminum sheet, which is an aluminum sheet that is strain-hardened and then partially annealed to give it a strength of H24.

[0045] For example, the first insulating layer 11 can be a PET (Polyethylene terephthalate) hot-pressed film, which can be connected to the metal layer 13 through a hot-pressing process.

[0046] It can be understood that when the connection area 1312 is connected to the module output stage 21 of the same polarity of multiple battery modules 31, the busbar 10 connects the multiple battery modules 31 in parallel. When the connection area 1312 is connected to the module output stage 21 of different polarities of multiple battery modules 31, the busbar 10 is connected to two battery modules 31. Specifically, the busbar 10 is connected to the positive terminal module output stage 21 of one battery module 31 and to the negative terminal module output stage 21 of another battery module 31, thereby connecting the two battery modules 31 in series.

[0047] It is understandable that the size of the flow-through cross-section of the metal layer 13 can be set according to the flow-through capacity of the busbar 10. For example, when a higher flow-through capacity is required, the flow-through cross-section of the metal layer 13 is set to be larger.

[0048] It is understood that the first insulating layer 11 insulates and isolates the isolation region 1311 from the battery module 31. Specifically, the first insulating layer 11 may be provided on a portion of the isolation region 1311, while the remaining portion of the isolation region 1311 may be suspended due to the presence of the first insulating layer 11, thus forming a gap between it and the battery module 31. This ensures that the remaining portions of the isolation region 1311 without the first insulating layer 11 are insulated and isolated from the battery module 31.

[0049] In this embodiment, by thermally coupling the first insulating layer 11 to the battery module 31, heat from the battery module 31 can be transferred to the metal layer 13 through the first insulating layer 11 for heat dissipation. Furthermore, by using the metal layer 13 as a bridging component between the battery modules 31, the metal layer 13 not only has a larger surface area, thus increasing the heat dissipation area of ​​the busbar 10, but also shortens the path of heat conduction from the first insulating layer 11 to the side of the busbar 10 away from the battery module 31, allowing heat from the battery module 31 to be conducted to the surrounding environment more quickly. This improves the heat dissipation efficiency of the battery module 31, thereby improving the heat dissipation efficiency of the battery pack 30.

[0050] Please see Figure 1 In one embodiment, the first insulating layer 11 covers the isolation area 1311. This not only increases the contact area between the busbar 10 and the battery module 31, which is beneficial for increasing the heat conduction area and improving the heat dissipation efficiency of the battery pack, but also ensures that the entire isolation area 1311 is insulated from the battery module 31, thereby improving the reliability of the insulation between the busbar 10 and the battery module 31, and thus improving the reliability of the battery pack 30.

[0051] Please see Figure 3In one embodiment, the metal layer 13 has a width dimension, and the isolation region 1311 and the connection region 1312 are sequentially arranged along the direction of the width dimension. This makes the layout structure of the isolation region 1311 and the connection region 1312 simple, which is conducive to improving the ease of operation of the connection between the first insulating layer 11 and the isolation region 1311, thereby improving production efficiency.

[0052] It can be understood that the direction of the width dimension is perpendicular to the arrangement direction of the multiple battery modules 31.

[0053] In one embodiment, the connection area 1312 is configured to be located on the side of the isolation area 1311 near the edge of the battery module 31. In this way, when connecting the connection area 1312 to the battery module 31, the space on one side of the battery module 31 can be used for operation, thereby improving the ease of operation of connecting the connection area 1312 to the battery module 31 and thus improving assembly efficiency.

[0054] Please see Figure 4 In one embodiment, a portion of the edge of the first insulating layer 11 extends beyond the edge of the metal layer 13. This increases the creepage distance between the metal layer 13 and the battery module 31, thereby improving the insulation between the busbar 10 and the battery module 31. Furthermore, it protects the edge of the metal layer 13 from damage during transportation or assembly.

[0055] It is understandable that the first insulating layer 11 does not cover the connection area 1312.

[0056] Please see Figure 1 In one embodiment, a portion of the edge line of the connection area 1312 coincides with a portion of the edge line of the metal layer 13. The edge of the first insulating layer 11 extends beyond the remaining edge lines of the metal layer 13. Thus, by providing the metal layer 13 within the dimension of the area where the edge of the first insulating layer 11 extends beyond the edge line of the metal layer 13, the first insulating layer 11 can cover the remaining edge lines of the metal layer 13. This increases the overlap and misalignment between the first insulating layer 11 and the metal layer 13. Consequently, the edges of the portion of the metal layer 13 not connected to the battery module 31 are protected by the metal layer 13, which helps improve the reliability of the insulation isolation between the metal layer 13 and the battery module 31.

[0057] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of a second type of busbar 10 provided in an embodiment of this application. In one embodiment, the busbar 10 further includes a second insulating layer 12. The metal layer 13 has a second surface 132 opposite to the first surface 131. The second surface 132 includes a first region 1321 and a second region 1322 respectively disposed opposite to the isolation region 1311 and the connection region 1312. The second insulating layer 12 is disposed in the first region 1321.

[0058] Specifically, along the thickness direction of the metal layer 13, the first region 1321 is opposite to the isolation region 1311, and the second region 1322 is opposite to the connection region 1312.

[0059] The second insulating layer 12 covers at least a portion of the first region 1321.

[0060] For example, the second insulating layer 12 covers the first region 1321. Specifically, a portion of the edge of the first insulating layer 11 extends beyond the edge of the metal layer 13. A portion of the edge line of the second region 1322 coincides with a portion of the edge line of the metal layer 13, and the edge of the second insulating layer 12 extends beyond the remaining edge line of the metal layer.

[0061] For example, the second insulating layer 12 can be a PET (Polyethylene terephthalate) hot-pressed film, which can be connected to the metal layer 13 through a hot-pressing process.

[0062] In this embodiment, by providing a second insulating layer 12, the insulation isolation between the side of the busbar 10 away from the battery module 31 and other components of the battery pack 30 can be improved, thereby improving the reliability of the battery pack 30.

[0063] Please see Figure 1 or Figure 4 In one embodiment, the busbar 10 is provided with a positioning hole 133, which penetrates the first insulating layer 11 and the metal layer 13.

[0064] Specifically, when the busbar 10 also includes a second insulating layer 12, the end of the positioning hole 133 facing away from the first insulating layer 11 passes through the second insulating layer 12.

[0065] For example, the axis of the positioning hole 133 is parallel to the thickness direction of the metal layer 13. The axis of the positioning hole 133 is also typically the Z-direction of the battery pack 30, that is, the direction perpendicular to the ground.

[0066] It is understood that the module output stage 21 of the battery module 31 is fixed on the plastic bracket, and the plastic bracket is provided with hot riveting posts, which pass through the module output stage 21.

[0067] Thus, when connecting the busbar 10 to the module output stage 21, the hot-riveting post is inserted into the positioning hole 133. This allows the busbar 10 to be positioned using the hot-riveting post, improving the relative positional accuracy between the busbar 10 and the module output stage 21, thereby increasing the installation efficiency of the busbar 10. Furthermore, it allows the hot-riveting post and the busbar 10 to share a portion of the height space, enabling the busbar 10 to be positioned closer to the module output stage 21, thus reducing the axial dimension of the battery pack 30 in the positioning hole 133.

[0068] Please see Figure 1 In one embodiment, a weight-reduction hole 134 is provided in the connection area 1312. The weight-reduction hole 134 is configured to be located between two adjacent battery modules 31.

[0069] It is understandable that two adjacent battery modules 31 are spaced apart, with a gap between them.

[0070] Based on this, in this embodiment, by setting a weight reduction hole 134 between two adjacent battery modules 31, the connection between the busbar 10 and the module output stage 21 will not be affected, and the amount of material used in the metal layer 13 can be reduced, so as to control the weight and material cost of the battery pack 30.

[0071] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a busbar assembly 20 provided in an embodiment of this application. The second aspect of this application provides a busbar assembly 20. The busbar assembly 20 includes a module output stage 21 and the aforementioned busbar 10. There are multiple module output stages 21. The multiple module output stages 21 are configured to be connected to multiple battery modules 31 respectively. One side of each module output stage 21 is connected to a connection area 1312, and the other side is configured to be connected to a battery module 31.

[0072] It is understood that when the busbar 10 connects multiple battery modules 31 in series, the bus assembly 20 includes two module output stages 21. One is a positive module output stage 21 connected to the positive terminal of one battery module 31, and the other is a negative module output stage 21 connected to the negative terminal output stage of another battery module 31. The busbar 10 connects these two battery modules 31 in series.

[0073] It is understood that when the busbar 10 connects multiple battery modules 31 in parallel, the busbar assembly 20 includes at least two module output stages 21. The at least two module output stages 21 are respectively connected to the positive terminals of at least two battery modules 31, or the at least two module output stages 21 are respectively connected to the negative terminals of at least two battery modules 31.

[0074] It is understandable that the busbar 10, the module output stage 21, and the battery cell 311 are arranged sequentially along the axial direction of the battery cell 311.

[0075] Specifically, the module output stage 21 is welded to the busbar 10, which can be laser welding. The length of the welded portion between the module output stage 21 and the busbar 10 is the same as the length of the module output stage 21. This allows for a larger welding area between the module output stage 21 and the busbar 10, thereby improving the reliability of the connection between the module output stage 21 and the busbar 10.

[0076] It is understood that the busbar assembly 20 includes the aforementioned busbar 10, and the busbar assembly 20 has all the beneficial effects of the busbar 10, which will not be repeated here.

[0077] Please see Figure 6 and Figure 7 , Figure 6 This is a side view of the bus assembly 20 provided in an embodiment of this application. Figure 7 yes Figure 6 A magnified structural diagram at point B. In one embodiment, the bus assembly 20 further includes multiple metal plates 22. Each of the multiple metal plates 22 corresponds one-to-one with a multiple module output stage 21. The metal plates 22 are located between the connection area 1312 and the corresponding module output stage 21. Both sides of the metal plates 22 are connected to the connection area 1312 and the corresponding module output stage 21, respectively.

[0078] It is understandable that the thickness of both the metal layer 13 and the module output stage 21 is relatively small. If the metal layer 13 and the module output stage 21 are directly welded, not only will the welding process be highly demanding, but it will also be easy for the metal layer 13 and the module output stage 21 to be welded through, resulting in poor welding quality between the metal layer 13 and the module output stage.

[0079] Based on this, in this embodiment, by setting the metal plate 22, not only can the welding power that can be withstood when welding between the metal layer 13 and the module output stage 21 be increased, but the metal layer 13 and the module output stage can also be effectively prevented from being welded through, thereby improving the welding quality between the metal layer 13 and the module output stage.

[0080] Specifically, the module output stage 21 is first welded to the metal plate 22, then the module output stage 21 is fixed to the plastic bracket, and then the busbar 10 is installed on the side of the module output stage 21 away from the plastic bracket. Finally, the connection area 1312 is welded to the metal plate 22.

[0081] It can be advantageous that the metal plate 22 is, but is not limited to, a copper plate or an aluminum plate.

[0082] For example, the module output stage 21 is an aluminum busbar, the metal layer 13 is a copper sheet or copper foil, and the metal plate 22 is a copper plate.

[0083] Please see Figure 7 In one embodiment, a metal plate 22 is configured to be located on one side of the battery module 31 along the radial direction of the battery cell 311. The module output stage 21 includes an inner connection portion 211, a bending portion 212, and an outer connection portion 213 connected in sequence. The inner connection portion 211 is configured to be connected to the corresponding battery module 31. The outer connection portion 213 is connected to the metal plate 22. The bending portion 212 is bent such that at least a portion of the outer connection portion 213 is configured to be disposed opposite to the battery cell 311 along the radial direction of the battery cell 311.

[0084] Specifically, the internal connection portion 211 is configured to be connected to the positive or negative terminal of the battery cell 311.

[0085] In this embodiment, the metal plate 22 can be arranged in the space on one side of the battery module 31 through the above arrangement, thereby reducing the Z-axis dimension occupied by the busbar assembly 20, which is conducive to reducing the Z-axis height dimension of the battery pack 30 and improving the energy density of the battery pack 30.

[0086] In one embodiment, the thickness of the metal plate 22 is greater than the thickness of the module output stage 21 and the busbar 10. Thus, the metal plate 22 ensures sufficient welding thickness between the module output stage 21 and the busbar 10, while also allowing for a smaller thickness of both the module output stage 21 and the busbar 10. This reduces the Z-axis space occupied by the portion of the busbar assembly 20 located above the battery module 31, thereby reducing the Z-axis height of the battery pack 30 and increasing its energy density.

[0087] In one embodiment, the metal plate 22 is a copper plate. This improves the current carrying capacity between the module output stage 21 and the busbar 10, and reduces resistance loss and heat generation.

[0088] Please see Figure 8 , Figure 8 A partial structural schematic diagram of the battery pack 30 provided in the embodiments of this application. In a third aspect, embodiments of this application provide a battery pack 30, which includes battery modules 31 and the aforementioned busbar assembly 20. Multiple battery modules 31 are provided. The multiple battery modules 31 are arranged in parallel. Multiple module output stages 21 are respectively connected to the battery modules 31. Along the axial direction of the cells 311 of the battery modules 31, the module output stages 21 are located on one side of the battery modules 31. A busbar 10 is located on the side of the module output stages 21 facing away from the battery modules 31. A first insulating layer 11 is thermally coupled to the battery modules 31.

[0089] It is understood that the battery module 31 includes multiple battery cells 311 and a connection bar 312 that electrically connects the multiple battery cells 311. The connection bar 312 can be a series connection or a parallel connection.

[0090] Specifically, a portion of the first insulating layer 11 is thermally coupled to the connection bar 312, and another portion is thermally coupled to the module output stage 21.

[0091] It is understood that the heat generated by the battery cell 311 and the heat generated by the connector 312 are transferred to the metal layer 13 through the first insulating layer 11, and then conducted to the surrounding environment through the side of the metal layer 13 away from the battery module 31.

[0092] In this embodiment, the busbar 10, module output stage 21, and battery module 31 are stacked sequentially, eliminating the need for a base to fix the module output stage 21, thus reducing the Z-axis dimension of the battery pack 30. Compared to related technologies that use a base, the installation height of the busbar 10 in this embodiment can be reduced to 60%–70% of the height in related technologies, thereby improving the energy density of the battery pack 30. For example, in related technologies, with a base, the busbar 10 is located 5 mm above the battery cell 311; in this embodiment, without the base, the busbar 10 is located 3 mm above the battery cell 311.

[0093] When the busbar 10 includes the second insulating layer 12, the busbar 10 can serve as an insulating component on the top of the battery module 31, can electrically connect multiple battery modules 31, and can also dissipate heat and cool down the battery module 31.

[0094] It is understood that the battery pack 30 includes the aforementioned busbar assembly 20. The battery pack 30 has all the beneficial effects of the busbar assembly 20, which will not be described in detail here.

[0095] In one embodiment, thermally conductive adhesive is provided between the first insulating layer 11 and the battery module 31, and the first insulating layer 11 is bonded to the battery module 31 by the thermally conductive adhesive. In this way, on the one hand, the gap between the first insulating layer 11 and the battery module 31 can be eliminated by the thermally conductive adhesive, reducing the thermal resistance of the air layer and allowing heat from the battery module 31 to be conducted to the first insulating layer 11 more quickly, thereby improving the heat dissipation efficiency of the battery pack 30. On the other hand, the busbar 10 can be fixed by the thermally conductive adhesive, which helps to improve the positional stability of the busbar 10.

[0096] For example, thermally conductive adhesives include, but are not limited to, silicone thermally conductive adhesives, acrylic thermally conductive adhesives, and polyurethane thermally conductive adhesives.

[0097] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A busbar (10) used in a battery pack (30), characterized in that, The busbar (10) includes: A metal layer (13) having a first surface (131) configured to face the battery module (31) of the battery pack (30), the first surface (131) including an isolation region (1311) and a connection region (1312); and, A first insulating layer (11) is disposed in the isolation area (1311); The first insulating layer (11) is configured to be thermally coupled to the battery module (31), and the connection area (1312) is configured to be connected to at least two of the battery modules (31) of the battery pack (30).

2. The busbar (10) according to claim 1, characterized in that, The first insulating layer (11) covers the isolation area (1311).

3. The busbar (10) according to claim 1, characterized in that, The metal layer (13) has a width dimension, and the isolation area (1311) and the connection area (1312) are arranged sequentially along the direction of the width dimension.

4. The busbar (10) according to claim 3, characterized in that, The connection area (1312) is configured to be located on the side of the isolation area (1311) near the edge of the battery module (31).

5. The busbar (10) according to any one of claims 1-4, characterized in that, A portion of the edge of the first insulating layer (11) extends beyond the edge of the metal layer (13).

6. The busbar (10) according to claim 5, characterized in that, A portion of the edge line of the connection area (1312) coincides with a portion of the edge line of the metal layer (13), and the edge of the first insulating layer (11) extends beyond the remaining edge line of the metal layer (13).

7. The busbar (10) according to any one of claims 1-4, characterized in that, The busbar (10) further includes a second insulating layer (12), and the metal layer (13) has a second surface (132) opposite to the first surface (131). The second surface (132) includes a first region (1321) and a second region (1322) respectively disposed opposite to the isolation region (1311) and the connection region (1312). The second insulating layer (12) is disposed in the first region (1321).

8. The busbar (10) according to any one of claims 1-4, characterized in that, The busbar (10) is provided with a positioning hole (133), which penetrates the first insulating layer (11) and the metal layer (13).

9. The busbar (10) according to any one of claims 1-4, characterized in that, A weight reduction hole (134) is provided in the connection area (1312), and the weight reduction hole (134) is configured to be located between two adjacent battery modules (31).

10. A bus assembly (20), characterized in that, include: The busbar (10) as described in any one of claims 1-9; as well as, Multiple module output stages (21) are configured to be connected to multiple battery modules (31) respectively; One side of the module output stage (21) is connected to the connection area (1312), and the other side is configured to be connected to the battery module (31).

11. The bus assembly (20) according to claim 10, characterized in that, The busbar assembly (20) also includes a plurality of metal plates (22), each of which corresponds to a plurality of module output stages (21). The metal plates (22) are located between the connection area (1312) and the corresponding module output stage (21), and both sides of the metal plates (22) are connected to the connection area (1312) and the corresponding module output stage (21), respectively.

12. The busbar assembly (20) according to claim 11, characterized in that, Along the radial direction of the cell (311) of the battery module (31), the metal plate (22) is configured to be located on one side of the battery module (31); The module output stage (21) includes an inner connection part (211), a bending part (212), and an outer connection part (213) connected in sequence. The inner connection part (211) is configured to be connected to the corresponding battery module (31), and the outer connection part (213) is connected to the metal plate (22). The bending part (212) is bent such that at least a portion of the outer connection part (213) is configured to be disposed opposite to the battery cell (311) along the radial direction of the battery cell (311).

13. The busbar assembly (20) according to claim 11, characterized in that, The thickness of the metal plate (22) is greater than the thickness of the module output stage (21) and the thickness of the busbar (10); and / or, The metal plate (22) is a copper plate.

14. A battery pack (30), characterized in that, include: Multiple battery modules (31) are arranged side by side; and ； In the busbar assembly (20) as described in any one of claims 10-13, the plurality of module output stages (21) are respectively connected to the battery module (31), and along the axial direction of the cell (311) of the battery module (31), the module output stage (21) is located on one side of the battery module (31); the busbar (10) is located on the side of the module output stage (21) away from the battery module (31), and the first insulating layer (11) is thermally coupled to the battery module (31).

15. The battery pack (30) according to claim 14, characterized in that, A thermally conductive adhesive is provided between the first insulating layer (11) and the battery module (31), and the first insulating layer (11) is bonded to the battery module (31) through the thermally conductive adhesive.

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