Busbar assembly, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a busbar assembly, a battery pack and electric equipment. The busbar assembly comprises a first busbar provided with a first mounting hole, and a second busbar provided with a second mounting hole, the second busbar is overlapped with the first busbar, the second busbar is provided with a second mounting hole, and the second mounting hole is opposite to the first mounting hole; the connecting seat comprises a seat body and a connecting column arranged on the seat body, the connecting column comprises a first fixing part and a second fixing part which are connected with each other, the first fixing part is arranged in the first mounting hole and the second mounting hole in a penetrating manner, and the second fixing part extends out of the second mounting hole; and the first busbar and the second busbar are clamped between the seat body and the second fixing part. By applying the technical scheme of the invention, the problems of poor connection stability and poor over-current capability of the busbar assembly in the prior art can be effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a bus bar assembly, a battery pack, and an electrical device. Background Art

[0002] Currently, battery modules are generally connected in series through bus bars and led out through the total positive and total negative.

[0003] In related technologies, the connection methods of the bus bars of adjacent battery modules include connection by fasteners or laser welding.

[0004] However, the above connection methods have poor connection stability for the bus bars, which will also affect the current-carrying capacity of the bus bars and reduce the performance of the battery modules. Connecting by fasteners will increase the internal resistance. During use, a dense oxide film will form on the surface of the bus bar due to heat generation, and the contact resistance will continue to increase during long-term use, resulting in excessive heat generation. If the screw connection is not tightened, connection loosening will occur, which is extremely likely to cause high-voltage arcing and the risk of connection failure. Using laser welding will have the risk of missed welding or incomplete penetration, affecting the current-carrying capacity of the bus bar. Summary of the Utility Model

[0005] The present application provides a bus bar assembly, a battery pack, and an electrical device to solve the problems of poor connection stability and poor current-carrying capacity of the bus bar assembly in related technologies.

[0006] On the one hand, the present application provides a bus bar assembly, including: a first bus bar provided with a first mounting hole; a second bus bar overlapping with the first bus bar, the second bus bar being provided with a second mounting hole, and the second mounting hole being opposite to the first mounting hole; a connection seat including a seat body and a connection column provided on the seat body, the connection column including a first fixing portion and a second fixing portion connected to each other, the first fixing portion passing through the first mounting hole and the second mounting hole, and the second fixing portion extending outside the second mounting hole; the first bus bar and the second bus bar being clamped between the seat body and the second fixing portion.

[0007] In some embodiments, in the cross-sectional projection perpendicular to the axis of the first mounting hole, the cross-sectional area of the second fixing portion is larger than the cross-sectional area of the first fixing portion.

[0008] In some embodiments, there is a step surface between the first fixing portion and the second fixing portion, the step surface is connected to the second bus bar, and the first bus bar is connected to the seat body.

[0009] In some embodiments, the edge of the second fixing portion protrudes in a direction away from the axis of the first mounting hole and surrounds the second mounting hole.

[0010] In some embodiments, the step surface is melt-connected to the second bus bar;

[0011] And / or, the first bus bar is melt-connected to the seat body;

[0012] And / or, the inner walls of the first mounting hole and the second mounting hole are both melt-connected to the first fixing part.

[0013] In some embodiments, a molten interface modification layer is coated on the surface of the first bus bar;

[0014] And / or, a molten interface modification layer is coated on the surface of the second bus bar.

[0015] On the other hand, the present application provides a battery pack, including:

[0016] A housing having a receiving cavity;

[0017] At least one battery module disposed in the receiving cavity;

[0018] A power distribution assembly disposed on the housing;

[0019] A bus bar assembly connecting at least one battery module and the power distribution assembly, and the bus bar assembly is the above-mentioned bus bar assembly.

[0020] In some embodiments, there are multiple battery modules, and any two adjacent battery modules are connected by the bus bar assembly.

[0021] In some embodiments, the battery pack further includes a support frame, the support frame is disposed in the receiving cavity and divides the receiving cavity into multiple installation chambers, and each installation chamber is provided with a battery module;

[0022] The bus bar assembly is disposed on the support frame, the first bus bar in the bus bar assembly is connected to one battery module, and the second bus bar in the bus bar assembly is connected to another battery module or the power distribution assembly.

[0023] In some embodiments, an insulating spacer is disposed between the support frame and the bus bar assembly.

[0024] In some embodiments, the support frame is provided with a mounting groove; the insulating spacer is disposed in the mounting groove, and the bus bar assembly is disposed on the insulating spacer; the second fixing part of the bus bar assembly does not protrude from the support frame.

[0025] In some embodiments, the support frame includes a plurality of first support beams spaced apart in a first direction, and two adjacent first support beams and the housing form an installation chamber;

[0026] The support frame further includes a second support beam extending in the first direction, and both ends of the second support beam are connected to the housing, wherein a second direction is perpendicular to the first direction;

[0027] The installation groove is arranged on the first support beam and / or the second support beam.

[0028] In some embodiments, the installation groove is arranged on the first support beam; the insulating spacer includes a fixing seat and a limiting convex portion arranged on the fixing seat. The fixing seat is mounted on the first support beam and covers the bottom wall of the installation groove.

[0029] The limiting convex portion includes at least two, and the two limiting convex portions are arranged at intervals in the second direction. The two limiting convex portions are respectively abutted against the two side walls of the installation groove.

[0030] In some embodiments, the power distribution assembly includes a first power distribution assembly and a second power distribution assembly arranged opposite to each other in the first direction.

[0031] On the other hand, the present application provides an electrical device including the above battery pack.

[0032] The bus bar assembly provided by the present application replaces the traditional fasteners by arranging a connecting seat. The connecting seat includes a seat body and a connecting column. The connecting column includes two parts, that is, the connecting column includes a first fixing portion connected to the seat body and a second fixing portion located at the end of the first fixing portion. The first fixing portion is inserted into the second mounting hole and the first mounting hole, and the second fixing portion penetrates to the outside of the second mounting hole and forms a seal for the second bus bar, so that the first bus bar and the second bus bar are clamped between the seat body and the second fixing portion. This structure can realize the stable connection between the bus bar and the connecting seat, and ensure the contact area between multiple bus bars and between the bus bar and the connecting seat, so that the bus bar assembly has better current-carrying capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0034] Figure 1 It is a schematic structural diagram of the bus bar assembly provided by the embodiment of the present application;

[0035] Figure 2 It is a schematic structural diagram of the bus bar assembly before welding provided by the embodiment of the present application;

[0036] Figure 3 It is a schematic structural diagram of the bus bar assembly during welding provided by the embodiment of the present application;

[0037] Figure 4 It is a schematic structural diagram of the welding head during welding of the bus bar assembly;

[0038] Figure 5 It is a schematic three-dimensional structural diagram of the battery pack provided by the embodiment of the present application;

[0039] Figure 6 It is a top view of the battery pack provided by the embodiment of the present application;

[0040] Figure 7 It is Figure 6 an enlarged structural schematic diagram of part A of the battery pack of;

[0041] Figure 8 It is Figure 7 a sectional view taken along line B-B of the battery pack of;

[0042] Figure 9 It is Figure 7 a sectional view taken along line C-C of the battery pack of;

[0043] Figure 10 It is Figure 7 a sectional view taken along line D-D of the battery pack of;

[0044] Figure 11 It is an assembly structural schematic diagram of an insulating spacer and a busbar assembly of the battery pack provided by an embodiment of the present application;

[0045] Figure 12 It is an assembly structural schematic diagram of an insulating spacer and a busbar assembly of the battery pack provided by another embodiment of the present application.

[0046] Description of reference numerals:

[0047] 10. Busbar assembly; 20. Battery pack;

[0048] 100. First busbar; 110. First mounting hole;

[0049] 200. Second busbar; 210. Second mounting hole;

[0050] 300. Connection seat; 310. Seat body; 320. Connection column; 321. First fixing part; 322. Second fixing part; 323. Step surface;

[0051] 400. Housing;

[0052] 500. Power distribution assembly; 510. First power distribution assembly; 520. Second power distribution assembly;

[0053] 600. Support frame; 601. Installation chamber; 610. First support beam; 611. Installation groove; 620. Second support beam;

[0054] 700. Insulating spacer; 710. Fixed seat; 711. First plate body; 712. Second plate body; 713. Third plate body; 720. Limit convex part;

[0055] 800. Battery module;

[0056] 900, welding head; 910, stirring part; 920, welding head body; 930, clamping column. Detailed implementation mode

[0057] To make the purpose, technical solution and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0058] The battery pack busbar is a key component in electric vehicles, responsible for effectively transmitting the electrical energy inside the battery module to the vehicle's power system.

[0059] In the series-parallel connection methods of battery pack modules on the market, most use bolt fastening connections and laser welding to achieve the connection of the total positive, total negative, and power distribution busbars of the module. With the continuous improvement of the power density of power batteries and the urgent demand for fast charging of power batteries by people, improving the overcurrent capacity of the busbar has become one of the key points in the development of power battery technology.

[0060] Currently, the common busbar material combinations are aluminum-aluminum, copper-aluminum, and copper-copper. The connection methods of the busbar include screw connection or laser welding. Using the screw connection scheme will result in a relatively large overall contact internal resistance of the busbar components. During use, a dense oxide film will form on the surface of the busbar components due to heat generation, and the contact resistance will continue to increase during long-term use, causing excessive heat generation. If the screw connection is not tightened and the connection becomes loose, it is extremely easy to cause high-voltage arcing, increasing the risk of busbar connection failure.

[0061] In the laser welding method, since common copper and aluminum are both high-reflectivity materials and the processing ability of the laser is limited, it is easy to have the situation of missed welding when the busbar thickness is small, and the welding process is complex when the busbar thickness is large, and it is easy to cause false welding.

[0062] Therefore, there is currently a lack of a busbar component that can both stably connect the busbar and ensure the overcurrent capacity of the busbar.

[0063] In view of this, this application provides a busbar component, including a first busbar, a second busbar, and a connection seat. The connection seat is provided with connection columns, and the connection columns pass through the first busbar and the second busbar and extend out of the second busbar. The connection columns are heated by a welding head to make the connection columns melt, and then with a certain pressure, the molten connection columns are deformed to limit the second busbar, and then the first busbar and the second busbar are fastened through the connection seat.

[0064] The specific structure of the busbar assembly of this embodiment will be described below with reference to the accompanying drawings.

[0065] Please refer to Figures 1 to 4 As shown, the busbar assembly of this embodiment includes: a first busbar 100, a second busbar 200, and a connection seat 300.

[0066] Among them, the first busbar 100 and the second busbar 200 are used to connect two different structures. For example, the first busbar 100 and the second busbar 200 are respectively connected to two different battery modules, or the first busbar 100 is used to connect a battery module, and the second busbar 200 is used to connect a power distribution assembly 500.

[0067] Specifically, the second busbar 200 and the first busbar 100 are arranged at least partially overlapping to ensure the contact area between the two. It should be understood that in this embodiment, the at least partially overlapping arrangement can be understood as the second busbar 200 and the first busbar 100 being completely overlapped or partially overlapped.

[0068] The first busbar 100 is provided with a first mounting hole 110, the second busbar 200 is provided with a second mounting hole 210, and the second mounting hole 210 is opposite to the first mounting hole 110. Among them, the first mounting hole 110 penetrates the first busbar 100 along the thickness direction of the first busbar 100, and the second mounting hole 210 penetrates the second busbar 200 along the thickness direction of the second busbar 200.

[0069] The connection seat 300 includes a seat body 310 and a connection post 320 provided on the seat body 310. The connection post 320 includes a first fixing portion 321 and a second fixing portion 322 that are connected to each other. Among them, the first fixing portion 321 passes through the first mounting hole 110 and the second mounting hole 210, and the second fixing portion 322 extends outside the second mounting hole 210; the first busbar 100 and the second busbar 200 are clamped between the seat body 310 and the second fixing portion 322.

[0070] The busbar assembly 10 of the present application replaces the traditional fasteners by providing a connecting seat 300. The connecting seat 300 includes a seat body 310 and a connecting column 320. The connecting column 320 includes two parts, that is, the connecting column 320 includes a first fixing part 321 connected to the seat body 310 and a second fixing part 322 located at the end of the first fixing part 321. The first fixing part 321 is inserted into the second mounting hole 210 and the first mounting hole 110, and the second fixing part 322 extends out of the second mounting hole 210 and forms a seal for the second busbar 200, so that the first busbar 100 and the second busbar 200 are clamped between the seat body 310 and the second fixing part 322. This structure can achieve a stable connection between the busbar and the connecting seat 300, and ensure the contact area between multiple busbars and between the busbar and the connecting seat 300, so that the busbar assembly has better current-carrying capacity.

[0071] Further, as Figure 1 shown, in the cross-section perpendicular to the axis of the first mounting hole 110, the cross-sectional area of the second fixing part 322 is larger than that of the first fixing part 321; or rather, the projected area of the second fixing part 322 on the seat body 310 is larger than the projected area of the first fixing part 321 on the seat body 310. So that the connecting column 320 can form a T-shaped structure, thereby increasing the contact area between the connecting column 320 and the second busbar 200 and improving the connection strength between the first busbar 100 and the second busbar 200.

[0072] Please continue to refer to the attached Figure 1 figure. A step surface 323 is formed between the first fixing part 321 and the second fixing part 322, and the combined action of the step surface 323 and the seat body 310 realizes the fastening effect on the first busbar 100 and the second busbar 200. After the second fixing part 322 is processed, the step surface 323 is connected to the second busbar 200, the first busbar 100 is connected to the seat body 310, and the step surface 323 increases the contact area between the second busbar 200 and the connecting column 320, thus ensuring the connection stability between the connecting seat 300, the first busbar 100 and the second busbar 200.

[0073] In some embodiments, the edge of the second fixing part 322 protrudes in the direction away from the axis of the second mounting hole 210 and surrounds the second mounting hole 210. That is to say, the second fixing part 322 includes a first part and a second part connected to each other. The first part is disposed opposite to the second mounting hole 210, and the second part protrudes in the direction away from the first part and forms an annular structure. This is beneficial to increasing the contact area between the second fixing part 322 and the second busbar 200 as much as possible, and thus significantly improving the fastening effect between the first busbar 100 and the second busbar 200.

[0074] It should be noted that the second fixing portion 322 can be processed by friction stir welding. Specifically, as Figure 3 shown, during welding, the welding head 900 directly contacts the portion of the connecting column 320 extending out of the second bus bar 200. The welding head 900 can generate heat and transfer the heat to the connecting column 320, causing the connecting column 320 and the bus bar in contact with the connecting column 320 to form a molten state. The welding head 900 applies pressure and a rotational force to the connecting column 320. The pressure can cause the molten connecting column 320 to deform, and the rotational force can enable the molten connecting column 320 and the bus bar to better fuse. Moreover, the molten connecting column 320 can deform in a direction away from the connecting column 320 to form the second part of the second fixing portion 322. In view of the fact that the second part of the second fixing portion 322 is formed by the extrusion of the welding head 900, which causes the molten connecting column 320 to undergo deformation and micro-displacement, therefore, the second fixing portion 322 forms a welding hole that is recessed towards the first fixing portion 321. Among them, the welding hole can be located on the center line of the second fixing portion 322 or can be arranged adjacent to the center line of the second fixing portion 322. It should also be noted that the selection of the friction stir welding head includes stirring pins of different designs, sizes and types, and shoulders of different designs and sizes. The main process parameters are the rotational speed of the stirring head, the downward pressure amount, and the welding time. According to different material combinations, the main welding parameters are adjusted. Mainly, it realizes the mutual diffusion and solid solution of each component at the connection interface of the bus bar in the thermoplastic state and under continuous pressure, and then cools and recrystallizes to form a tightly bonded joint, achieving the connection of the bus bar.

[0075] Through the above friction stir welding method, a metallurgical bonding interface is formed in the welding area of the bus bar assembly 10, and the current-carrying area has been significantly improved. Friction stir welding belongs to solid-state connection. The welding process is similar to upsetting. The oxide film is easily broken and extruded. The total heat input is low. The flow bonding effect of the metallurgical interface is good. The foreign matters generated during welding are better recognized, and the welding effect of dissimilar metals is good. Friction stir spot welding can also perform pretreatment or prefabricate filler metal at the base material or the welding material, and realize joint interface regulation or hybrid brazing connection effect during the welding process. Compared with other welding methods, friction stir welding has lower requirements for the welding atmosphere (such as vacuum or gas protection, etc.) and the environment (such as temperature and humidity conditions, etc.). Most of the oxide films can be broken during the friction stir process, and the influence on the material surface is reduced.

[0076] It should also be noted that through the above friction stir welding method, the molten connection of each interface can be achieved. After the installation of the welding head 900 and the setting of the welding parameters, the welding head 900 first performs friction stir pressurization and heating on the connecting column 320, causing the connecting column 320 to undergo a forging-like deformation, expand and closely fit with the first mounting hole 110 and the second mounting hole 210, and then continuously perform pressurization and heating to transfer the heat to the joint surface of the first bus bar 100 and the second bus bar 200. During the pressurized stirring process of the thermoplastic metal, the atoms at the joint surface diffuse and dissolve into each other, and finally, during the cooling and crystallization process, the connection at the atomic level is achieved.

[0077] Specifically, friction stir welding can achieve the molten connection between the stepped surface 323 and the second bus bar 200 to ensure the connection stability between the first bus bar 100 and the second bus bar 200.

[0078] Alternatively, friction stir welding can achieve the molten connection between the first bus bar 100 and the seat body 310, which can reduce the internal resistance between the first bus bar 100 and the seat body 310 while ensuring the connection stability between the first bus bar 100 and the seat body 310.

[0079] Or, friction stir welding can achieve the molten connection between the hole walls of the first mounting hole 110 and the second mounting hole 210 and the first fixing portion 321, thereby ensuring the firm connection between the connecting column 320, the first bus bar 100, and the second bus bar 200.

[0080] Furthermore, in some embodiments, a molten interface modification layer can be coated on the surface of the first bus bar 100. Exemplarily, the molten interface modification layer can be a metal coating or an adhesive layer, thereby improving the meltability between different interfaces and further achieving a better welding effect.

[0081] Correspondingly, a molten interface modification layer can also be coated on the surface of the second bus bar 200.

[0082] It should be noted that as Figure 4 shown, the welding head 900 includes a welding head main body 920, a stirring portion 910 provided at the first end of the welding head main body 920, and a clamping column 930 provided at the second end of the welding head main body 920. The stirring portion 910 is used to quickly raise the temperature of the welding area and achieve molten pool stirring during the welding process, and its shape and size are designed according to different processes. After the welding head main body 920 reaches a certain rotational speed and downward pressure, it continuously inputs heat to the welding area and maintains heat balance to ensure the thermoplasticity and fluidity of the metal in the molten pool, and achieve full fusion of the joint. Its size is designed according to the welding area. The clamping column 930 is used for mechanical connection with the friction stir welding driving device.

[0083] Exemplarily, two connecting posts 320 may be provided on a connecting base 300 to increase the contact area between the connecting base 300 and the bus bar.

[0084] It should be noted that two connecting bases 300 may be included in a bus bar assembly 10. In the Figure 11 embodiment shown, only one bus bar may also be provided on each connecting base 300. In the Figure 11 embodiment shown, each of the two connecting bases 300 may have a first bus bar 100 and a second bus bar 200. The number of bus bars provided on each connecting base 300 may be selected according to actual conditions.

[0085] The embodiment of the present application also provides a battery pack 20. The specific structure of the battery pack 20 will be described below with reference to the drawings.

[0086] Please refer to Figures 5 to 12 shown, the battery pack 20 includes: a housing 400, a battery module 800, a power distribution assembly 500, and a bus bar assembly 10.

[0087] Among them, the housing 400 has a receiving cavity for receiving structures such as the battery module 800 and the bus bar assembly 10.

[0088] It should be understood that the number of battery modules 800 may be one or more. For example, at least one battery module 800 is disposed in the receiving cavity. When the number of battery modules 800 is multiple, the multiple battery modules 800 are arranged at intervals in the receiving cavity.

[0089] The power distribution assembly 500 is disposed on the housing 400. Among them, the power distribution assembly 500 may be disposed inside the housing 400 or on the housing 400. For example, the power distribution assembly 500 may be penetrated through the housing 400, and the power distribution assembly 500 can be connected to the battery module 800 through the bus bar assembly 10.

[0090] The battery pack 20 of the embodiment of the present application includes the bus bar assembly 10, and the bus bar assembly 10 realizes the connection between the battery module 800 and the power distribution assembly 500. Since the bus bar assembly 10 has the advantages of low internal resistance and high connection stability, the battery pack having it also has the advantages of low internal resistance, good over-current capacity, and high stability. It should be noted that the first bus bar 100 and the second bus bar 200 may be bent or folded to facilitate connection with the ear of the battery module 800.

[0091] When the number of battery modules 800 is multiple, correspondingly, the number of busbar assemblies 10 is also multiple, so that any adjacent battery modules 800 can also be connected through the busbar assembly 10, and the battery module 800 close to the power distribution assembly 500 is connected to the power distribution assembly 500.

[0092] Further, as Figure 5 and Figure 6 shown, in some embodiments, the battery pack 20 further includes a support frame 600. The support frame 600 is disposed in the accommodation cavity and divides the accommodation cavity into multiple installation chambers 601. Each installation chamber 601 is provided with a battery module 800; the busbar assembly 10 is disposed on the support frame 600. The first busbar 100 in the busbar assembly 10 is connected to one battery module 800, and the second busbar 200 in the busbar assembly 10 is connected to another battery module 800 or the power distribution assembly 500.

[0093] In the above structure, the support frame 600 is disposed in the accommodation cavity. On the one hand, it provides support for the housing 400, improves the structural strength of the housing 400, and also optimizes the space utilization efficiency in the accommodation cavity. The support frame 600 is internally designed with multiple installation chambers 601, which are used to accommodate and fix the battery modules 800, so that each battery module can be installed in an independent space, ensuring the isolation between the battery modules and being beneficial to the heat dissipation and maintenance of the battery pack.

[0094] The busbar assembly 10 is disposed on the support frame 600, making use of the space of the support frame 600, so that the layout of each structure in the battery pack is reasonable. The first busbar 100 in the busbar assembly 10 is directly connected to the battery module 800, and the second busbar 200 is connected to another battery module 800 or the power distribution assembly 500, thereby realizing the busbar function of the battery pack.

[0095] Such a design not only simplifies the assembly process of the battery pack, improves the production efficiency, but also facilitates the maintenance and upgrade of the battery pack in a modular manner. When a certain battery module fails, it can be replaced separately without affecting the operation of the entire battery pack. In addition, through the flexible connection of the busbar assembly, the battery pack can adapt to different voltage and current requirements and meet the requirements of different application scenarios.

[0096] It should be noted that the multiple installation chambers 601 in this embodiment can be formed by multiple support beams in the support frame 600, and multiple installation chambers 601 are jointly enclosed by the multiple support beams and the housing 400 of the battery pack.

[0097] In some embodiments, an insulating spacer 700 is disposed between the support frame 600 and the busbar assembly 10 to achieve the effect of insulating and isolating the support frame 600 from the busbar assembly 10.

[0098] Specifically, an installation groove 611 is provided on the support frame 600, the insulating spacer 700 is disposed in the installation groove 611, the busbar assembly 10 is disposed on the insulating spacer 700, and the second fixing portion 322 of the busbar assembly 10 does not protrude from the support frame 600, thereby preventing the busbar assembly 10 from occupying space in the accommodation cavity in the height direction and contributing to improving the energy density of the battery pack.

[0099] In some embodiments, the support frame 600 includes a plurality of first support beams 610 spaced apart in a first direction (such as Figure 6 the direction shown), and each first support beam 610 extends in a second direction (such as Figure 6 the y direction shown). An installation chamber 601 is formed between two adjacent first support beams 610 and the housing 400. The first support beams 610 can partition the battery modules 800 and improve the heat dissipation effect of the battery modules 800. In addition, the first support beams 610 can also be connected to the housing 400 to enhance the structural strength of the housing 400.

[0100] The support frame 600 further includes a second support beam 620 extending in the first direction (such as Figure 6 the x direction shown). Both ends of the first support beam 610 and / or the second support beam 620 are connected to the housing 400; exemplarily, both ends of each first support beam 610 are connected to the housing 400. This setting enables the first support beam 610 to form a stable support for the housing 400, thereby enhancing the structural strength of the housing 400, reducing the probability of deformation or breakage of the housing 400, and making the battery pack have better anti-damage ability.

[0101] At the same time, the second support beam 620 can also, together with the first support beam 610, play a role in partitioning the battery modules 800, making the distribution of the battery modules 800 in the accommodation cavity more reasonable and contributing to the thermal management of the battery modules 800. Wherein, the second direction is perpendicular to the first direction.

[0102] The installation groove 611 is provided on the first support beam 610 and / or the second support beam 620. As an example, the installation groove 611 is provided on the first support beam 610 or the second support beam 620. As another example, the installation groove 611 is provided on both the first support beam 610 and the second support beam 620. With such a setting, the layout of the installation groove 611 can be flexibly adjusted according to the installation positions of the plurality of battery modules 800 and the power distribution assembly 500, thereby improving the design flexibility of the battery pack.

[0103] In a possible implementation manner, the installation groove 611 is provided on the first support beam 610. The insulation spacer 700 includes a fixing base 710 and a limiting convex portion 720 provided on the fixing base 710. The fixing base 710 is erected on the first support beam 610 to achieve a firm connection with the first support beam 610. At the same time, the fixing base 710 can cover the bottom wall of the installation groove 611, achieving the effect of insulating and isolating the busbar assembly 10 and the first support beam 610.

[0104] Specifically, the fixing base 710 can be formed by enclosing a first plate body 711, a second plate body 712, and a third plate body 713. The first plate body 711 covers the bottom wall of the installation groove 611. The second plate body 712 and the third plate body 713 are spaced apart in the first direction, that is, the second plate body 712 and the third plate body 713 are respectively located on both sides of the first support beam 610 in the first direction. When the insulation spacer 700 has a tendency to move in the first direction, the second plate body 712 or the third plate body 713 can stop the first support beam 610 to prevent the insulation spacer 700 from moving in the first direction.

[0105] Furthermore, there are two limiting convex portions 720. The two limiting convex portions 720 are spaced apart in the second direction. The two limiting convex portions 720 are respectively in contact with the two side walls of the installation groove 611, thereby preventing the insulation spacer 700 from moving in the second direction and improving the connection stability of the insulation spacer 700 in the installation groove 611. Therefore, after the above-mentioned insulation spacer 700 is installed in the installation groove 611, it will not move in the first direction and the second direction, thereby achieving a stable connection with the installation groove 611.

[0106] It should be noted that when the installation groove 611 is provided on the second support beam 620, the two limiting convex portions 720 are spaced apart in the first direction.

[0107] In some embodiments, a clamping member can also be provided on the limiting convex portion 720, and a clamping mating member is provided on the first support beam 610. Through the cooperation of the clamping member and the clamping mating member, the stable connection between the insulation spacer 700 and the first support beam 610 is further realized.

[0108] It should be noted that in some embodiments, the insulation spacer 700 can be an injection molded part, a ceramic part, or other insulating composite material parts. In other embodiments, the insulation spacer 700 can also be an insulating glue layer, a thermally conductive structural glue, a composite adhesive, or a new fluid material, which is formed on the first support beam 610 when the first support beam 610 is processed.

[0109] Furthermore, please refer to Figure 6, the power distribution assembly 500 includes a first power distribution assembly 510 and a second power distribution assembly 520 that are oppositely arranged in the first direction. The first power distribution assembly 510 is used to aggregate the positive outputs of all battery modules 800, while the second power distribution assembly 520 aggregates the negative outputs of all battery modules 800. Their design ensures the smooth flow of current, reduces power loss, and also facilitates the connection of external circuits, such as the drive system or charging system in an electric vehicle. Among them, the first power distribution assembly 510 can be a front-wheel drive power distribution assembly, and the second power distribution assembly can be a rear-wheel drive power distribution assembly.

[0110] As Figures 9 to 12 shown, in some embodiments, the present application also provides an electrical device, including the above-mentioned battery pack, and the battery pack is used to provide electrical energy for the electrical device.

[0111] The electrical device in the embodiments of the present application can be a vehicle. For example, the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Correspondingly, the electrical device can be a drive mechanism of the vehicle or a control system of the vehicle.

[0112] In addition, the electrical device can also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships, and spacecrafts, etc. Among them, the spacecraft can include airplanes, rockets, space shuttles, or spaceships.

[0113] In view of the fact that the electrical device in this embodiment includes the battery pack described in any of the above embodiments, therefore, the electrical device includes the battery pack structure and beneficial effects, and this embodiment will not be elaborated herein.

[0114] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0115] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0116] The terms "first", "second", "third", "fourth", etc. (if any) in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein, for example.

[0117] In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A busbar assembly, characterized in that, Comprising: A first bus bar (100) provided with a first mounting hole (110); A second bus bar (200) disposed at least partially overlapping with the first bus bar (100), the second bus bar (200) being provided with a second mounting hole (210), the second mounting hole (210) being opposite to the first mounting hole (110); A connecting seat (300) including a seat body (310) and a connecting column (320) disposed on the seat body (310), the connecting column (320) including a first fixing portion (321) and a second fixing portion (322) connected to each other, the first fixing portion (321) passing through the first mounting hole (110) and the second mounting hole (210), and the second fixing portion (322) protruding outside the second mounting hole (210); The first bus bar (100) and the second bus bar (200) are clamped between the seat body (310) and the second fixing portion (322).

2. The bus bar assembly according to claim 1, characterized in that, On the cross-sectional projection perpendicular to the axis of the first mounting hole (110), the cross-sectional area of the second fixing portion (322) is larger than the cross-sectional area of the first fixing portion (321).

3. The bus bar assembly according to claim 2, wherein, A step surface (323) is provided between the first fixing portion (321) and the second fixing portion (322), the step surface (323) is connected to the second bus bar (200), and the first bus bar (100) is connected to the seat body (310).

4. The busbar assembly according to claim 3, characterized in that, The edge of the second fixing portion (322) protrudes in a direction away from the axis of the second mounting hole (210) and surrounds the second mounting hole (210).

5. The busbar assembly according to claim 3 or 4, characterized in that, The step surface (323) is melt-connected to the second bus bar (200); And / or, the first bus bar (100) is melt-connected to the seat body (310); And / or, the hole walls of the first mounting hole (110) and the second mounting hole (210) are both melt-connected to the first fixing portion (321).

6. The busbar assembly according to any one of claims 1 to 4, characterized in that The surface of the first bus bar (100) is coated with a molten interface modification layer; And / or, the surface of the second bus bar (200) is coated with a molten interface modification layer.

7. A battery pack, characterized in that, Comprising: A housing (400) having an accommodation cavity; At least one battery module (800) disposed in the accommodation cavity; A power distribution assembly (500) disposed on the housing (400); A bus bar assembly (10) connecting at least one of the battery modules (800) to the power distribution assembly (500), the bus bar assembly (10) being the bus bar assembly according to any one of claims 1 to 6.

8. The battery pack according to claim 7, wherein There are multiple battery modules (800), and any adjacent battery modules (800) are connected by the bus bar assembly (10).

9. The battery pack according to claim 8, wherein The battery pack further includes a support frame (600), the support frame (600) is disposed in the accommodation cavity and divides the accommodation cavity into multiple installation chambers; each installation chamber (601) is provided with the battery module (800); The busbar assembly is disposed on the support frame (600). The first busbar (100) in the busbar assembly (10) is connected to one of the battery modules (800), and the second busbar (200) in the busbar assembly (10) is connected to the other battery module (800) or the power distribution assembly (500).

10. The battery pack according to claim 9, wherein, An insulating spacer (700) is disposed between the support frame (600) and the busbar assembly (10).

11. The battery pack according to claim 10, characterized in that, The support frame (600) is provided with a mounting groove (611). The insulating spacer (700) is disposed in the mounting groove (611), and the busbar assembly (10) is disposed on the insulating spacer (700). The second fixing portion (322) of the busbar assembly (10) does not protrude from the support frame (600).

12. The battery pack according to claim 11, wherein, The support frame (600) includes a plurality of first support beams (610) spaced apart in a first direction, and each of the first support beams (610) extends in a second direction; an installation chamber (601) is formed between two adjacent first support beams (610) and the housing. The support frame (600) further includes a second support beam (620) extending in the first direction, and both ends of the second support beam (620) are connected to the housing (400), wherein the second direction is perpendicular to the first direction. The mounting groove (611) is provided in the first support beam (610) and / or the second support beam (620).

13. The battery pack according to claim 12, wherein The mounting groove (611) is provided in the first support beam (610). The insulating spacer (700) includes a fixing base (710) and a limiting convex portion (720) disposed on the fixing base (710). The fixing base (710) is mounted on the first support beam (610) and covers the mounting groove (611). The limiting convex portion (720) includes two, and the two limiting convex portions (720) are spaced apart in the second direction, and the two limiting convex portions (720) are respectively abutted against two side walls of the mounting groove (611).

14. The battery pack according to any one of claims 7-13, characterized in that, The power distribution assembly (500) includes a first power distribution assembly (510) and a second power distribution assembly (520) oppositely disposed in a first direction.

15. An electrical device, characterized in that, A battery pack according to any one of claims 7 to 14.

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