Busbar, battery pack and vehicle

Abstract

The application discloses a busbar, a battery pack and a vehicle, and belongs to the technical field of batteries. The busbar comprises a first busbar plate, a second busbar plate and a heat transfer part. The first busbar plate is provided with a containing structure. The second busbar plate is arranged in a laminated mode with the first busbar plate. The heat transfer part is located between the first busbar plate and the second busbar plate and is arranged in the containing structure. The containing structure is arranged on the first busbar plate, and the second busbar plate is arranged in a laminated mode with the first busbar plate, so that a stable mounting space is provided for the heat transfer part. The heat generated by the battery cell can not only be dissipated through the first busbar plate and the second busbar plate, but also be more efficiently conducted by means of the heat transfer part, thereby significantly improving the overall heat dissipation and heat transfer capacity of the busbar.

Description

Technical Field

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

[0002] The battery pack is a crucial component of a power battery system, and the battery cell, as the energy carrier of the battery pack, is its basic unit. Battery cells are typically connected in series or parallel via connectors to form battery modules. The busbar is a key component for achieving electrical connections between the cells and is responsible for conducting the operating current. With the widespread adoption of fast charging technology, battery systems need to withstand extremely large charging and discharging currents in a short period. Current flowing through the busbar, which has internal resistance, generates a significant amount of heat, causing its temperature to rise rapidly.

[0003] However, in conventional battery pack design, due to space constraints, the cooling system is usually located on the large surface or bottom of the cell, making it difficult to effectively dissipate heat from the busbar area located at the top of the cell. Utility Model Content

[0004] This application provides a busbar, a battery pack, and a vehicle to address the technical problem of insufficient heat dissipation capacity in at least a portion of the busbar area.

[0005] To achieve the above objectives, according to a first aspect of this application, a bus is provided, the bus comprising: The first busbar has a receiving structure. The second busbar is stacked on top of the first busbar; A heat transfer section is located between the first busbar and the second busbar, and is disposed within the receiving structure.

[0006] In some embodiments, the receiving structure protrudes toward the side away from the second busbar, and a receiving groove is formed on the side of the receiving structure toward the second busbar, the heat transfer part is disposed in the receiving groove, and the second busbar closes the opening of the receiving groove.

[0007] In some embodiments, the first busbar is provided with multiple rows of the receiving structures at intervals along a first direction, and the receiving structures in each row are provided at intervals along a second direction; The length direction of the receiving structure is parallel to the first direction.

[0008] In some embodiments, the first busbar has a first raised portion, the length direction of the first raised portion being parallel to the second direction; The second busbar has a second raised portion corresponding to the first raised portion, and the length direction of the second raised portion is consistent.

[0009] In some embodiments, the first raised portion protrudes in a direction away from the second busbar and forms a through raised groove; The second raised portion protrudes towards the first busbar and is embedded in the raised groove.

[0010] In some embodiments, the first raised portion is disposed at the middle of the first busbar along the first direction; The second raised portion is disposed in the middle of the second busbar along the first direction.

[0011] In some embodiments, positioning holes are spaced apart on the second busbar; A welding clearance hole is provided on the first busbar corresponding to the positioning hole; the projection of the welding clearance hole on the second busbar completely covers the positioning hole, and the area of ​​the welding clearance hole is larger than the area of ​​the positioning hole.

[0012] In some embodiments, the first busbar and the second busbar are parallel to each other and are connected by brazing.

[0013] According to a second aspect of this application, a battery pack is provided, the battery pack comprising: Multiple battery cells; The first aspect of this application provides a busbar that connects the terminals of two adjacent battery cells.

[0014] According to a third aspect of this application, a vehicle is also provided, the vehicle including the battery pack provided in the second aspect of this application.

[0015] The busbar provided in the first aspect of this application provides a stable mounting space for the heat transfer section by setting a housing structure on the first busbar and stacking the second busbar with the first busbar. The heat generated by the battery cell can not only be dissipated through the first and second busbars themselves, but also undergo more efficient heat conduction with the help of the heat transfer section, thereby significantly improving the overall heat dissipation and heat transfer capacity of the busbar.

[0016] The battery pack provided in the second aspect of this application has all the beneficial effects of the aforementioned busbar; the vehicle provided in the third aspect of this application has all the beneficial effects of the aforementioned battery pack, which will not be repeated here.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description 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 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.

[0018] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0019] Figure 1 This is an exploded view of the bus provided in an exemplary embodiment of this disclosure; Figure 2 This is a schematic diagram of the bus structure provided in an exemplary embodiment of this disclosure; Figure 3 This is a public announcement Figure 2 Top view; Figure 4 This is a schematic diagram of the structure of the second busbar provided in an exemplary embodiment of this disclosure; Figure 5 This is a schematic diagram of the structure of a battery pack provided in an exemplary embodiment of this disclosure.

[0020] Explanation of reference numerals in the attached figures: 1. Busbar; 11. First busbar; 12. Second busbar; 13. Heat transfer section; 14. Receiving structure; 15. Positioning hole; 16. Welding clearance hole; 17. First raised section; 18. Second raised section; 2. Battery cell. Detailed Implementation

[0021] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0022] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between 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.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] The battery pack is a crucial component of a power battery system, and the battery cell, as the energy carrier of the battery pack, is its basic unit. Battery cells are typically connected in series or parallel via connectors to form battery modules. The busbar is a key component for achieving electrical connections between the cells and is responsible for conducting the operating current. With the widespread adoption of fast charging technology, battery systems need to withstand extremely large charging and discharging currents in a short period. Current flowing through the busbar, which has internal resistance, generates a significant amount of heat, causing its temperature to rise rapidly.

[0026] However, in conventional battery pack designs, due to space constraints, cooling systems are typically located on the large surface or bottom of the battery cell, making it difficult to effectively dissipate heat directly from the busbar area located at the top of the cell. Secondly, the battery cell undergoes continuous expansion and contraction during cycling, generating periodic stress on the rigidly connected busbar. Over long-term exposure, this can lead to loosening or breakage of the connection points, or fatigue damage to the busbar itself, seriously threatening the long-term reliability of the electrical connection. Furthermore, busbars designed to improve performance, featuring multi-layered or precision-fitted characteristics, often face challenges in alignment and complex assembly processes.

[0027] Firstly, this embodiment provides a busbar 1, please refer to... Figure 1 , Figure 2 The busbar 1 includes a first busbar 11, a second busbar 12, and a heat transfer section 13. The first busbar 11 is provided with a receiving structure 14; the second busbar 12 is stacked on top of the first busbar 11; the heat transfer section 13 is located between the first busbar 11 and the second busbar 12, and is disposed within the receiving structure 14.

[0028] By providing a receiving structure 14 on the first busbar 11 and stacking the second busbar 12 with the first busbar 11, a stable installation space is provided for the heat transfer section 13. The heat generated by the battery cell 2 can not only be dissipated through the first busbar 11 and the second busbar 12 themselves, but also be transferred more efficiently by the heat transfer section 13, thereby significantly improving the overall heat dissipation and heat transfer capacity of the busbar 1.

[0029] The first busbar 11 and the second busbar 12 are parallel to each other and are connected by brazing. The parallel plate structure ensures that there is a uniform joint surface between the two, which facilitates the brazing connection. The brazing connection not only achieves a strong mechanical connection, but also establishes a high thermal conductivity path between the first busbar 11 and the second busbar 12, so that heat can be quickly conducted and evenly distributed between the two with very low thermal resistance. This integrates the two busbars into an equivalent temperature homogenizer, thereby improving the overall heat dissipation efficiency of the busbar 1.

[0030] The first busbar 11 and the second busbar 12 can be made of extruded aluminum profiles. In some other embodiments, the first busbar 11 and the second busbar 12 can also be made of copper or other highly conductive materials.

[0031] The heat transfer section 13 is made of phase change material. When the temperature of the busbar 1 rises to the phase change point of the phase change material, the phase change material undergoes a phase change by absorbing heat, thereby effectively suppressing the rapid rise in temperature of the busbar 1 in a short period of time, thus smoothing out temperature fluctuations during the charging and discharging process and improving the reliability of thermal management.

[0032] In some examples, the phase change material includes a graphite-paraffin composite material. The graphite-paraffin composite material combines excellent heat storage capacity with a rapid thermal response, which can enhance the thermal buffering and temperature equalization capabilities of busbar 1 in the face of instantaneous high current heating.

[0033] The receiving structure 14 protrudes towards the side away from the second busbar 12, and a receiving groove is formed on the side of the receiving structure 14 facing the second busbar 12. The heat transfer part 13 is disposed in the receiving groove, and the second busbar 12 closes the opening of the receiving groove. The receiving structure 14 and the second busbar 12 together form a relatively closed space to prevent the heat transfer part 13 from falling out of the receiving structure 14.

[0034] For example, the receiving structure 14 is a protruding structure formed on the first busbar 11 by a stamping process, and the protruding structure itself constitutes the groove wall of the receiving groove.

[0035] Busbar 1 has a first direction X and a second direction Y. The first busbar 11 has multiple rows of receiving structures 14 spaced apart along the first direction X, and the receiving structures 14 in each row are spaced apart along the second direction Y; wherein the first direction X and the second direction Y are perpendicular to each other, and the length direction of the receiving unit is parallel to the first direction X. This multi-row, spaced matrix layout provides dispersed installation space for the heat transfer section 13, matching its regular arrangement with the battery cells 2, achieving precise and comprehensive thermal management of multiple key heat-generating areas, effectively expanding the heat dissipation area, avoiding localized heat accumulation in the busbar 1, and improving the uniformity and reliability of the overall heat dissipation efficiency of the busbar 1.

[0036] The number and arrangement of the accommodating structures 14 can be designed as needed and are not limited here. For example, Figure 3 As shown, the first busbar 11 has two rows of receiving structures 14 spaced apart along the first direction X, and four receiving structures 14 are spaced apart along the second direction Y in each row.

[0037] See Figure 2 The first busbar 11 is provided with a first raised portion 17, the length direction of which is parallel to the second direction Y; see reference Figure 4 The second busbar 12 has a second raised portion 18 corresponding to the first raised portion 17, and the length direction of the second raised portion 18 is consistent. The first raised portion 17 protrudes in a direction away from the second busbar 12 and forms a through raised groove; the second raised portion 18 protrudes in a direction close to the first busbar 11 and is embedded in the raised groove.

[0038] The first raised portion 17 and the second raised portion 18 enable the first busbar 11 and the second busbar 12 to have a certain deformation capacity, which can effectively absorb and compensate for the expansion and contraction in the planar direction caused by the cyclic charging and discharging of the battery cell 2, thereby reducing the stress generated inside the busbar 1 due to changes in external dimensions and improving structural reliability and service life. In addition, the second raised portion 18 is embedded in the first raised portion 17, forming a mechanical positioning feature, which can realize the rapid alignment of the first busbar 11 and the second busbar 12 during the assembly process, thereby improving assembly accuracy and efficiency.

[0039] In some examples, the second raised portion 18 has the same structure as the first raised portion 17, and the two are fitted together.

[0040] Positioning holes 15 are provided at intervals along the first direction X on the second busbar 12; the positioning holes 15 are positioned and connected to the poles of the two adjacent cells 2.

[0041] See Figure 3 A welding clearance hole 16 is provided on the first busbar 11 corresponding to the positioning hole 15; the projection of the welding clearance hole 16 on the second busbar 12 completely covers the positioning hole 15, and the area of ​​the welding clearance hole 16 is larger than the area of ​​the positioning hole 15. This provides working space for the welding connection between the second busbar 12 and the pole at the positioning hole 15.

[0042] It is understandable that the receiving structure 14 and the welding clearance hole 16 are misaligned.

[0043] The first raised portion 17 is disposed in the middle of the first busbar 11 along the first direction X and is located between the two welding clearance holes 16; the second raised portion 18 is disposed in the middle of the second busbar 12 along the first direction X and is located between the two positioning holes 15.

[0044] Secondly, this embodiment provides a battery pack, see reference. Figure 5 The battery pack includes multiple battery cells 2 and a busbar 1 provided in the first aspect of this application, wherein the busbar 1 connects the terminals of two adjacent battery cells 2.

[0045] The battery cells 2 are arranged at intervals along the first direction X; the arrangement direction of the battery cells 2 is perpendicular to the extension direction of the first raised portion 17 and the second raised portion 18, so that the first raised portion 17 and the second raised portion 18 can more directly and efficiently resist the periodic stress caused by the volume change of the battery cells 2, effectively suppress the bending deformation of the busbar 1, and improve the mechanical stability and long-term reliability of the entire battery module.

[0046] Busbar 1 is located on the side where the terminal of cell 2 is located. The positioning hole 15 of busbar 1 is welded to the terminal of adjacent cell 2 with opposite polarities to connect adjacent cells 2 in series.

[0047] The first busbar 11 is located on the side of the second busbar 12 away from the battery cell 2, which facilitates the connection between the positioning hole 15 and the terminal of the battery cell 2.

[0048] The battery pack provided in this embodiment has all the beneficial effects of the busbar 1 described above, which will not be repeated here.

[0049] Thirdly, this embodiment provides a vehicle that includes the battery pack provided in the second aspect of this application.

[0050] The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this disclosure does not make any specific restrictions.

[0051] The vehicle provided in this embodiment has all the beneficial effects of the battery pack described above, which will not be repeated here.

[0052] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0053] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0054] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0055] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A busbar, characterized in that, The bus (1) includes: The first busbar (11) is provided with a receiving structure (14). The second busbar (12) is stacked on top of the first busbar (11); The heat transfer section (13) is located between the first busbar (11) and the second busbar (12) and is disposed within the receiving structure (14).

2. The busbar according to claim 1, characterized in that, The receiving structure (14) protrudes toward the side away from the second busbar (12), and the receiving structure (14) has a receiving groove on the side toward the second busbar (12). The heat transfer part (13) is disposed in the receiving groove, and the second busbar (12) closes the opening of the receiving groove.

3. The busbar according to claim 1, characterized in that, The first busbar (11) is provided with multiple rows of the receiving structures (14) at intervals along a first direction (X), and the receiving structures (14) in each row are provided at intervals along a second direction (Y); The length direction of the receiving structure (14) is parallel to the first direction (X).

4. The busbar according to claim 3, characterized in that, The first busbar (11) is provided with a first raised portion (17), the length direction of the first raised portion (17) is parallel to the second direction (Y); The second busbar (12) has a second raised portion (18) corresponding to the first raised portion (17), and the length direction of the second raised portion (18) is consistent.

5. The busbar according to claim 4, characterized in that, The first raised portion (17) protrudes in a direction away from the second busbar (12) and forms a through raised groove; The second raised portion (18) protrudes toward the first busbar (11) and is embedded in the raised groove.

6. The busbar according to claim 4, characterized in that, The first raised portion (17) is disposed in the middle of the first busbar (11) along the first direction (X); The second raised portion (18) is disposed in the middle of the second busbar (12) along the first direction (X).

7. The busbar according to claim 1, characterized in that, Positioning holes (15) are provided at intervals on the second busbar (12); A welding clearance hole (16) is provided on the first busbar (11) corresponding to the positioning hole (15); the projection of the welding clearance hole (16) on the second busbar (12) completely covers the positioning hole (15), and the area of ​​the welding clearance hole (16) is larger than the area of ​​the positioning hole (15).

8. The busbar according to claim 1, characterized in that, The first busbar (11) and the second busbar (12) are parallel to each other and are connected by brazing.

9. A battery pack, characterized in that, The battery pack includes: Multiple battery cells (2); The bus (1) as described in any one of claims 1 to 8, wherein the bus (1) connects the terminals of two adjacent cells (2).

10. A vehicle, characterized in that, The vehicle includes the battery pack as described in claim 9.

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