Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment. The battery pack comprises a battery cell assembly, a bracket and a heat dissipation plate, the battery cell assembly comprises a plurality of battery cells stacked along a first direction; the support has a first wall. The heat dissipation plate is installed on the support and is opposite to the first wall in the first direction, the battery cell assembly is arranged between the first wall and the heat dissipation plate, and the battery cell assembly is in heat conduction connection with the heat dissipation plate, so that the expansion degree of the battery cell assembly in the first direction is reduced, the expansion of a shell of a battery cell is relieved, and the safety performance of the battery pack is improved; and the risk that the battery core assembly moves in the first direction is reduced, and the stability is improved. The battery cell assembly is in heat conduction connection with the heat dissipation plate, the heat dissipation plate quickly transfers heat of the battery cell assembly, the heat dissipation efficiency of the battery cell assembly is improved, the problem that the local temperature of the battery cell assembly is too high is solved, and the safety performance of the battery pack is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] With the rapid development of new energy technologies, batteries have been widely used in electronic equipment, electric vehicles, electric two-wheeled vehicles, power tools and other fields. The capacity of batteries is getting larger and larger. In order to form a large-capacity battery, multiple cells are connected in series, in parallel or in mixed connection and then loaded into a box to form a battery pack. For large-capacity battery packs, higher requirements are placed on the safety performance of the battery pack. Summary of the invention

[0003] The embodiments of the present application provide a battery pack and an electrical device to improve the safety performance of the battery pack.

[0004] In a first aspect, an embodiment of the present application provides a battery pack, comprising a battery cell assembly, a bracket and a heat sink; the battery cell assembly comprises a plurality of battery cells stacked along a first direction; the bracket has a first wall; the heat sink is mounted on the bracket and is arranged opposite to the first wall along the first direction, the battery cell assembly is arranged between the first wall and the heat sink, and the battery cell assembly is thermally connected to the heat sink.

[0005] In one or more of the above optional embodiments, by arranging the battery cell assembly between the first wall of the bracket and the heat sink, the heat sink and the first wall jointly limit the battery cell assembly, thereby improving the stability of the battery cell assembly, reducing the expansion degree of the battery cell assembly in the first direction, alleviating the expansion of the battery cell shell, improving the safety performance of the battery pack, and also helping to reduce the risk of the battery cell assembly moving in the first direction and improving stability. By thermally connecting the battery cell assembly to the heat sink, the heat generated by the battery cell assembly during the charging and discharging process of the battery pack can be transferred to the heat sink, and the heat of the battery cell assembly can be quickly transferred through the heat sink, thereby improving the heat dissipation efficiency of the battery cell assembly, alleviating the problem of excessively high local temperature of the battery cell assembly, reducing the probability of safety accidents in the battery pack, and further improving the safety performance of the battery pack.

[0006] In some embodiments of the first aspect of the present application, the bracket further includes a second wall, the second wall is connected to the first wall and extends along an edge of the first wall, and the heat sink is mounted on the second wall.

[0007] In one or more of the above optional embodiments, by locking the heat sink to the second wall of the bracket, the installation of the heat sink is more stable, and the heat sink and the first wall of the bracket have a stable relative position relationship, which can better limit the expansion of the battery cell assembly in the first direction. By connecting the second wall to the first wall and extending along the edge of the first wall, the second wall portion can be arranged around at least part of the periphery of the battery cell assembly, which can protect the battery cell assembly and improve the reliability of the battery cell assembly. The heat sink is installed on the second wall to facilitate the connection between the heat sink and the bracket.

[0008] In some embodiments of the first aspect of the present application, the heat sink includes a metal layer, a first insulating layer and a second insulating layer. Along the first direction, the first insulating layer is arranged on the side of the metal layer facing the battery cell assembly, and the second insulating layer is arranged on the side of the metal layer facing away from the battery cell assembly.

[0009] In one or more of the above optional embodiments, the heat sink includes a metal layer and a first insulating layer and a second insulating layer disposed on both sides of the metal layer. The metal layer has good thermal conductivity, which is beneficial to quickly transfer the heat of the battery cell assembly and improve the heat dissipation efficiency. The metal layer also makes the heat sink have good mechanical properties, which is beneficial for the heat sink to have good strength and rigidity, so that the heat sink has good heat dissipation capacity and the ability to limit the battery cell assembly. The first insulating layer and the second insulating layer can reduce the risk of short circuit in the internal structure of the battery pack and improve the safety performance of the battery pack.

[0010] In some embodiments of the first aspect of the present application, the thermal conductivity of the first insulating layer is greater than the thermal conductivity of the second insulating layer.

[0011] In one or more of the above optional embodiments, by setting the thermal conductivity of the first insulating layer facing the battery cell assembly to be greater than the thermal conductivity of the second insulating layer facing away from the battery cell assembly, the heat transfer efficiency between the battery cell assembly and the heat sink is improved, which is beneficial to improving the heat dissipation efficiency of the battery cell assembly.

[0012] In some embodiments of the first aspect of the present application, the battery pack further comprises a box body, the box body forms a containing space, and the battery cell assembly, the bracket and the heat sink are all contained in the box body.

[0013] In one or more of the above optional embodiments, the battery pack also includes a box body. By accommodating the battery cell assembly, bracket and heat sink in the box body, the internal structure of the battery pack can be better protected, the ability of the battery pack to resist external forces can be improved, the safety performance of the battery pack can be improved, the service life of the battery pack can be extended, and the battery pack can also be used for more complex working conditions.

[0014] In some embodiments of the first aspect of the present application, the battery pack further includes a circuit board, the battery cell assembly is electrically connected to the circuit board, and the circuit board is disposed on a side of the heat dissipation plate facing away from the battery cell assembly.

[0015] In one or more of the above optional embodiments, the battery pack also includes a circuit board, and the circuit board is arranged on the side of the heat sink away from the battery cell assembly. The heat sink can act as a partition between the battery cell assembly and the circuit board. In the event of a fire in the battery cell assembly, the heat sink can reduce the risk of burning the circuit board and other structures on the side where the circuit board is located due to the fire in the battery cell assembly, that is, reduce the risk of burning between the electrode assembly and the circuit board, and improve the safety performance of the battery pack. At the same time, the thermal conductivity of the second insulating layer is small, which is conducive to reducing the heat transferred from the heat sink to the circuit board and reducing the impact on the circuit board.

[0016] In some embodiments of the first aspect of the present application, the battery cell assembly has a first electrode portion and a second electrode portion with opposite polarities, and the first electrode portion and the second electrode portion are both electrically connected to the circuit board; the battery pack also includes a first electrical connector, which connects the first electrode portion and the circuit board, and the first electrical connector is thermally connected to the heat sink.

[0017] In one or more of the above optional embodiments, the first electrode portion and the circuit board are electrically connected via the first electrical connector, making the electrical connection between the first electrode portion and the circuit board more convenient. The first electrical connector is thermally connected to the heat sink, so that during the charging and discharging process of the battery pack, the heat at the corresponding position of the first electrode portion can be transferred to the heat sink, and the heat at the first electrode portion is quickly transferred through the heat sink, thereby improving the heat dissipation efficiency of the battery cell assembly, alleviating the problem of local overheating of the battery cell assembly, and then alleviating the problem of excessively high local temperature of the battery cell assembly, reducing the possibility of explosion or fire in the battery pack, and further improving the safety performance of the battery pack.

[0018] In some embodiments of the first aspect of the present application, the first electrical connector includes a first part and a second part that are connected, the first part is located on one side of the battery cell assembly along the second direction, the second part is located on a side of the heat sink away from the battery cell assembly, and is thermally connected to the heat sink, and the second direction is perpendicular to the first direction.

[0019] In one or more of the above optional embodiments, the first electrical connector includes a first part and a second part that are connected, and the first part is located on one side of the battery cell assembly along the second direction, and the second part is located on the side of the heat sink away from the battery cell assembly. This facilitates the electrical connection between the first electrical connector and the first electrode portion, and also facilitates the connection between the circuit board and the heat sink and the first electrical connector.

[0020] In some embodiments of the first aspect of the present application, the battery pack further includes a second electrical connector, which connects the second electrode portion and the circuit board, and the second electrical connector is thermally connected to the heat sink.

[0021] In one or more of the above optional embodiments, the second electrode portion and the circuit board are electrically connected via a second electrical connector, making the electrical connection between the second electrode portion and the circuit board more convenient. The second electrical connector is thermally connected to the heat sink, so that during the charging and discharging process of the battery pack, the heat at the corresponding position of the second electrode portion can be transferred to the heat sink, and the heat at the second electrode portion is quickly transferred through the heat sink, thereby improving the heat dissipation efficiency of the battery cell assembly, alleviating the problem of local overheating of the battery cell assembly, and further alleviating the problem of excessively high local temperature of the battery cell assembly, reducing the possibility of explosion or fire in the battery pack, and further improving the safety performance of the battery pack.

[0022] In some embodiments of the first aspect of the present application, the second electrical connector includes a third part and a fourth part that are connected, the third part is located on one side of the battery cell assembly along the second direction, and the fourth part is located on a side of the heat sink away from the battery cell assembly and is thermally connected to the heat sink, and the second direction is perpendicular to the first direction.

[0023] In one or more of the above optional embodiments, the second electrical connector includes a connected third part and a fourth part, and the third part is located on one side of the battery cell assembly along the second direction, and the fourth part is located on the side of the heat sink away from the battery cell assembly. This facilitates the electrical connection between the second electrical connector and the second electrode portion, and also facilitates the connection between the circuit board and the heat sink and the second electrical connector.

[0024] In some embodiments of the first aspect of the present application, the first electrode portion and the second electrode portion are located at the same end of the battery cell assembly along a second direction, and the second direction is perpendicular to the first direction.

[0025] In one or more of the above optional embodiments, by arranging the first electrode portion and the second electrode portion at the same end of the battery cell assembly in the second direction, the risk of interference between the first electrode portion and the second electrode and the heat sink is reduced, which is also beneficial to reducing the size of the battery cell assembly in the second direction, thereby reducing the volume of the battery pack.

[0026] In some embodiments of the first aspect of the present application, along the first direction, the second electrode portion is closer to the circuit board than the first electrode portion.

[0027] In one or more of the above optional embodiments, by moving the second electrode portion closer to the circuit board than the first electrode portion along the first direction, a larger distance exists between the first electrode portion and the second electrode portion in the first direction, thereby reducing the risk of internal short circuit in the battery pack and improving the safety performance of the battery pack.

[0028] In some embodiments of the first aspect of the present application, the battery cell includes a main body and a first pole ear and a second pole ear with opposite polarities, the first pole ear and the second pole ear are arranged at the end of the main body along the second direction, and in the battery cell assembly, at least one first pole ear forms the first electrode portion, and at least one second pole ear forms the second electrode portion, and the second direction is perpendicular to the first direction; the first electrical connector is at least partially arranged on one side of the battery cell assembly along the second direction; the battery pack also includes an insulating bracket, and along the second direction, the insulating bracket is at least partially located between the first electrical connector and the battery cell assembly.

[0029] In one or more of the above optional embodiments, the battery pack also includes an insulating bracket, and along the second direction, at least a portion of the insulating bracket is located between the first electrical connector and the battery cell assembly. The insulating bracket can insulate and separate the first electrical connector and the tab on the side of the first electrical connector facing the battery cell assembly, thereby reducing the risk of internal short circuit in the battery pack and improving the safety performance of the battery pack.

[0030] In some embodiments of the first aspect of the present application, the insulating support is provided with a first plug hole, the first plug hole extends along the first direction, and the first electrical connector is inserted into the first plug hole.

[0031] In one or more of the above optional embodiments, by providing a first socket on the insulating bracket and inserting the first electrical connector into the first socket, the first electrical connector can be stabilized and strengthened, thereby improving the stability of the first electrical connector and reducing the risk of the first electrical connector being damaged or deformed by external forces.

[0032] In some embodiments of the first aspect of the present application, the insulating bracket includes a hole wall portion surrounding the first plug hole, the hole wall portion includes a first hole wall portion, the first hole wall portion is located at an end of the insulating bracket away from the battery cell assembly, the first hole wall portion is provided with a first through hole, and the first through hole is connected to the first plug hole.

[0033] In one or more of the above optional embodiments, a first through hole connected to the first plug hole is provided on the first hole wall portion at one end of the insulating bracket away from the battery cell assembly, which facilitates the first electrical connector to dissipate heat from the first through hole, alleviates the problem of high temperature of the first electrical connector, and improves the safety and reliability of the battery pack.

[0034] In some embodiments of the first aspect of the present application, the first electrical connector has a fuse portion, the fuse portion is located on the current path between the first electrode portion and the circuit board, and at least a portion of the insulating bracket is located on a side of the fuse portion facing the battery cell assembly.

[0035] In one or more of the above optional embodiments, by locating at least a portion of the insulating bracket on the side of the fuse part facing the battery cell assembly, the insulating bracket can block the risk of slag generated by the fuse part melting from contacting the tab on the side of the insulating bracket facing the battery cell assembly, thereby reducing the risk of internal short circuit in the battery pack and secondary thermal runaway in the battery pack, and improving the safety performance of the battery pack.

[0036] In an embodiment of the first aspect of the present application, the battery cell includes a main body and a pole lug, the pole lug is connected to the end of the main body along a second direction, and the first direction is perpendicular to the second direction; the battery pack also includes a pole lug bracket, and a protrusion is provided on the side of the pole lug bracket facing the battery cell assembly, and at least a portion of the protrusion is located between two adjacent pole lugs along the first direction.

[0037] In one or more of the above optional embodiments, a protrusion is provided on the side of the pole lug holder facing the battery cell assembly, and at least a portion of the protrusion is located between two adjacent pole lugs in the first direction. The protrusion can support the pole lug, which is beneficial for the pole lug to maintain a state of extending along the second direction, reduces the risk of the pole lug being inserted upside down into the main body, and improves the safety performance of the battery pack.

[0038] In an embodiment of the first aspect of the present application, the end of the battery cell assembly facing the pole lug support has at least one row of the pole lugs, and each row of the pole lugs includes a plurality of the pole lugs arranged along the first direction; the pole lug support is provided with at least one row of the protrusions, and each row of the protrusions is arranged corresponding to a row of the pole lugs, and each row of the protrusions includes a plurality of the protrusions arranged at intervals along the first direction, and at least one pole lug is arranged between two adjacent protrusions.

[0039] In one or more of the above optional embodiments, each row of protrusions includes a plurality of protrusions spaced apart along the first direction, and at least one pole ear is provided between two adjacent protrusions. Then, in each row of pole ears, as many adjacent pole ears as possible have protrusions between them, which is beneficial for the pole ears to maintain a state of extending along the second direction, reduces the risk of the pole ears being inserted upside down into the main body, and improves the safety performance of the battery pack.

[0040] In a second aspect, an embodiment of the present application provides an electric device, wherein the electric device comprises a battery pack provided in any embodiment of the first aspect.

[0041] In one or more of the above optional embodiments, the battery pack provided in any embodiment of the first aspect has good safety performance, so that the electrical equipment powered by the battery pack has good power safety and power reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope.

[0043] Figure 1 A schematic diagram of the structure of a battery pack provided in some embodiments of the present application;

[0044] Figure 2 An exploded view of a battery pack provided for some embodiments of the present application;

[0045] Figure 3 A schematic diagram of the structure of a battery cell provided for some embodiments of the present application;

[0046] Figure 4 A schematic diagram of the cooperation between a battery cell assembly and a heat sink provided in some embodiments of the present application;

[0047] Figure 5 A schematic diagram of the structure of a heat sink provided in some embodiments of the present application;

[0048] Figure 6 A schematic diagram of the structure of a first electrical connector provided in some embodiments of the present application;

[0049] Figure 7 A schematic diagram of the structure of a second electrical connector provided in some embodiments of the present application;

[0050] Figure 8 A schematic diagram of a battery cell assembly and an insulating bracket after being matched with each other according to some embodiments of the present application;

[0051] Fig. 9 A schematic diagram of the structure of an insulating bracket provided in some embodiments of the present application;

[0052] Fig.10 A schematic diagram of the insulating bracket and the first electrical connector provided in some embodiments of the present application after being matched;

[0053] Fig.11 A schematic diagram of the coordination of a battery cell assembly and other structures provided in some embodiments of the present application;

[0054] Fig.12 A schematic diagram of the structure of a tab support provided in some embodiments of the present application along a first viewing angle;

[0055] Fig.13 A schematic structural diagram of a pole tab support provided in some embodiments of the present application along a second viewing angle.

[0056] Icons: 100-battery pack; 10-cell assembly; 11-cell; 111-housing; 112-main body; 113-ear; 113a-first ear; 113b-second ear; 114-first electrode; 115-second electrode; 20-bracket; 21-first wall; 211-first edge; 212-second edge; 213-third edge; 22-second wall; 221-wall; 2211-first wall; 2212-second wall; 2213-third wall; 222-first mounting hole; 30-box; 31-first box; 311-opening; 32-second box; 40-heat sink; 41-second mounting hole; 42 -metal layer; 43-first insulating layer; 44-second insulating layer; 50-circuit board; 60-first electrical connector; 61-first part; 62-second part; 63-fuse part; 70-second electrical connector; 71-third part; 72-fourth part; 80-insulating bracket; 81-first plug hole; 811-hole wall; 8111-first hole wall; 82-insulating body; 83-first limiting part; 84-second limiting part; 85-guiding channel; 86-third limiting part; 87-first through hole; 90-ear bracket; 91-second plug hole; 92-second through hole; 101-protrusion; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0058] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed for protection, but merely represents selected embodiments of the present application. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0059] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0060] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0061] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as electric tools, drones, energy storage equipment and other fields. With the continuous expansion of battery application fields, the market demand is also constantly expanding.

[0062] As a type of battery, a battery pack includes multiple cells connected in series, parallel or mixed, so that the battery pack has a larger capacity to meet large power needs. For a battery pack, a large amount of heat will be generated inside during the charging and discharging process, and the local temperature may be too high. If the heat generated inside the battery pack is not transferred in time, it may cause safety problems such as explosion and fire.

[0063] Based on the above considerations, in order to improve the safety performance of the battery pack, an embodiment of the present application provides a battery pack, which includes a battery cell assembly, a bracket and a heat sink; the battery cell assembly includes a plurality of battery cells stacked along a first direction; the bracket has a first wall; the heat sink is installed on the bracket and is arranged opposite to the first wall along the first direction, the battery cell assembly is arranged between the first wall and the heat sink, and the battery cell assembly is thermally connected to the heat sink.

[0064] By arranging the battery cell assembly between the first wall of the bracket and the heat sink, the heat sink and the first wall jointly limit the battery cell assembly, thereby improving the stability of the battery cell assembly and reducing the expansion degree of the battery cell assembly in the first direction, alleviating the expansion of the battery cell shell, gas generation, and even causing safety accidents such as explosion or fire, improving the safety performance of the battery pack, and reducing the risk of the battery cell assembly moving in the first direction, thereby improving stability. By thermally connecting the battery cell assembly to the heat sink, the heat generated by the battery cell assembly during the charging and discharging process of the battery pack can be transferred to the heat sink, and the heat of the battery cell assembly can be quickly transferred through the heat sink, thereby improving the heat dissipation efficiency of the battery cell assembly, alleviating the problem of excessively high local temperature of the battery cell assembly, reducing the occurrence of safety accidents such as explosion or fire in the battery pack, and further improving the safety performance of the battery pack.

[0065] The embodiment of the present application provides an electric device using a battery pack as a power source, and the electric device may be, but is not limited to, an electric tool, an electric vehicle, an unmanned aerial vehicle, and an energy storage device. Among them, the electric tool may include an electric drill, an electric saw, etc., and the electric vehicle may include an electric car, an electric motorcycle, an electric bicycle, etc.

[0066] like Figure 1 , Figure 2 As shown, Figure 1 A schematic diagram of the structure of a battery pack 100 provided in some embodiments of the present application, Figure 2 An exploded view of a battery pack 100 provided in some embodiments of the present application. The battery pack 100 includes a battery cell assembly 10, and the battery cell assembly 10 includes a plurality of battery cells 11 stacked along a first direction X.

[0067] like Figure 3 As shown, Figure 3 A schematic diagram of the structure of a battery cell 11 provided for some embodiments of the present application. The battery cell 11 includes a shell 111 and an electrode assembly (not shown in the figure), and the shell 111 is formed with a storage space. The storage space can be used to accommodate electrode assemblies, electrolytes, etc. The shell 111 can be a hard shell, for example, the shell 111 is a steel shell or an aluminum shell, forming a steel shell battery cell or an aluminum shell battery cell. The shell 111 can also be formed of a softer material, for example, the shell 111 is an aluminum-plastic film or a steel-plastic film, forming a soft-pack battery cell.

[0068] The electrode assembly includes a first electrode sheet, a second electrode sheet and a separator. The first electrode sheet and the second electrode sheet have opposite polarities, that is, one of the first electrode sheet and the second electrode sheet is a positive electrode sheet, and the other of the first electrode sheet and the second electrode sheet is a negative electrode sheet.

[0069] The isolation film insulates and separates the first pole piece and the second pole piece, thereby reducing the risk of short circuit of the battery cell 11. The isolation film may be made of polypropylene (PP) or polyethylene (PE).

[0070] The electrode assembly can be a wound structure or a stacked structure.

[0071] The electrode assembly is a wound structure. Specifically, the first pole piece, the separator, the second pole piece and another separator are stacked and then wound to form an electrode assembly with a wound structure; or the separator, the first pole piece, another separator and the second pole piece are stacked and then wound to form an electrode assembly with a wound structure.

[0072] In an embodiment in which the electrode assembly is a laminated structure, the first electrode sheet, the isolation membrane, and the second electrode sheet are laminated more than once in a certain order.

[0073] Please continue to refer to Figure 3The battery cell 11 includes a main body 112, a first pole ear 113a and a second pole ear 113b. The shell 111 and the electrode assembly form the main body 112 of the battery cell 11. The first pole ear 113a and the second pole ear 113b have opposite polarities. The first pole ear 113a is electrically connected to the first pole sheet, and the second pole ear 113b is electrically connected to the second pole sheet. The first pole ear 113a and the second pole ear 113b are arranged at the end of the main body 112 along the second direction Y. Among them, the first pole ear 113a and the second pole ear 113b can be arranged at the same end of the main body 112 along the second direction Y, and the first pole ear 113a and the second pole ear 113b can also be respectively arranged at the opposite ends of the main body 112 along the second direction Y. Figure 3 FIG. 4 shows a case where the first electrode tab 113 a and the second electrode tab 113 b are disposed at the same end of the main body 112 along the second direction Y. FIG.

[0074] In the embodiment where the battery cell 11 is a soft-pack battery cell 11 , the first pole tab 113 a and the second pole tab 113 b may extend out of the housing 111 , and the battery cell 11 may be electrically connected to other structures through the first pole tab 113 a and the second pole tab 113 b .

[0075] The first pole tab 113a and the second pole tab 113b may extend out of the housing 111 from the end of the battery cell 11 in the second direction Y. The first pole tab 113a and the second pole tab 113b may extend out of the housing 111 from the same end of the battery cell 11 along the second direction Y, or the first pole tab 113a and the second pole tab 113b may extend out of the housing 111 from opposite ends of the battery cell 11 along the second direction Y. The first direction X is perpendicular to the second direction Y.

[0076] like Figure 2 As shown, the battery pack 100 further includes a bracket 20, at least a portion of which is disposed on one side of the battery cell assembly 10 along the first direction X. Specifically, as Figure 2 As shown, the bracket 20 includes a first wall 21 , and the first wall 21 is disposed on one side of the battery cell assembly 10 along the first direction X.

[0077] The bracket 20 further includes a second wall 22, which is connected to the first wall 21 and extends along the edge of the first wall 21. The second wall 22 surrounds at least part of the outer periphery of the battery cell assembly 10. The second wall 22 may include a plurality of wall portions 221, which are connected in sequence. Please continue to refer to Figure 2The second wall 22 includes a first wall portion 2211, a second wall portion 2212, and a third wall portion 2213 connected in sequence. Along the third direction Z, the first wall portion 2211 and the third wall portion 2213 are arranged opposite to each other, and the second wall portion 2212 connects the first wall portion 2211 and the third wall portion 2213. The first wall 21 includes a first edge 211, a second edge 212, and a third edge 213 arranged opposite to each other along the third direction Z. Along the third direction Z, the first edge 211 and the third edge 213 are arranged opposite to each other, and the second edge 212 connects the first edge 211 and the third edge 213. One end of the first wall portion 2211 is connected to the first edge 211, one end of the second wall portion 2212 is connected to the second edge 212, and one end of the third wall portion 2213 is connected to the third edge 213.

[0078] By connecting the second wall 22 to the first wall 21 and extending along the edge of the first wall 21 , the second wall portion 2212 can surround at least a portion of the periphery of the battery cell assembly 10 , thereby protecting the battery cell assembly 10 and improving the reliability of the battery cell assembly 10 .

[0079] like Figure 1 , Figure 2 As shown, in some embodiments, the battery pack 100 further includes a box body 30 , the box body 30 is formed with a receiving space, and the battery cell assembly 10 and the bracket 20 are both received in the box body 30 .

[0080] Specifically, the box 30 includes a first box 31 and a second box 32 , and the first box 31 has an opening 311 at one end along the first direction X. The second box 32 covers the opening 311 of the first box 31 , so that the first box 31 and the second box 32 together define a receiving space of the box 30 .

[0081] The battery cell assembly 10 and the bracket 20 are both accommodated in the box body 30, which can better protect the internal structure of the battery pack 100, improve the ability of the battery pack 100 to resist external forces, improve the safety performance of the battery pack 100 and extend the service life of the battery pack 100, and also help the battery pack 100 to be suitable for more complex working conditions.

[0082] When the battery pack 100 is provided with the case 30, the support 20 may not be provided. When the battery pack 100 is provided with the support 20, the case 30 may not be provided.

[0083] like Figure 2 , Figure 4 As shown, the battery pack 100 further includes a heat sink 40 , which is mounted on the bracket 20 and disposed opposite to the first wall 21 along the first direction X. The battery cell assembly 10 is disposed between the first wall 21 and the heat sink 40 .

[0084] By disposing the battery cell assembly 10 between the first wall 21 of the bracket 20 and the heat sink 40, the heat sink 40 and the first wall 21 jointly limit the battery cell assembly 10, thereby improving the stability of the battery cell assembly 10 and reducing the expansion degree of the battery cell assembly 10 in the first direction X, alleviating the expansion of the outer shell 111 of the battery cell 11, gas generation, and even safety accidents such as explosion or fire, thereby improving the safety performance of the battery pack 100, and reducing the risk of the battery cell assembly 10 moving in the first direction X, thereby improving stability.

[0085] In an embodiment where the battery pack 100 includes a box body 30 and no bracket 20 is provided, the box body 30 is equivalent to the bracket 20, and the first wall 21 can be a wall portion of the box body 30, for example, the first wall 21 is the bottom wall of the first box body 31 opposite to the opening 311 or the side wall surrounding the opening 311.

[0086] In the embodiment where the battery pack 100 includes a case 30 and a bracket 20, the cell assembly 10, the bracket 20 and the heat sink 40 are all disposed in the case 30. The bracket 20 can be installed in the case 30. The bracket 20 can be detachably installed in the case 30, for example, the bracket 20 is installed in the case 30 by bolts, buckles, etc. The bracket 20 can also be fixedly installed in the case 30, for example, the bracket 20 can be welded to the case 30 or bonded to the case 30.

[0087] The bracket 20 and the case 30 can jointly protect the battery cell assembly 10. The case 30 provides the first level of protection for the internal structure of the battery pack 100, and the bracket 20 provides the second level of protection for the battery cell assembly 10, thereby improving the ability of the battery pack 100 to resist external forces, improving the safety performance of the battery pack 100, and extending the service life of the battery pack 100, and also facilitating the battery pack 100 to be suitable for more complex working conditions.

[0088] The heat sink 40 and the first wall 21 are arranged relative to each other in the first direction X, that is, the first wall 21 and the heat sink 40 are respectively arranged on two opposite sides of the battery cell assembly 10 along the first direction X, and the first wall 21 and the heat sink 40 jointly limit the battery cell assembly 10 in the first direction X.

[0089] The heat sink 40 is mounted on the bracket 20. The heat sink 40 can be fixedly mounted on the bracket 20, such as by welding the heat sink 40 to the bracket 20 or by bonding the heat sink 40 to the bracket 20, so as to improve the connection stability of the heat sink 40. The heat sink 40 can be detachably mounted on the bracket 20, such as by bolts to the bracket 20.

[0090] The heat sink 40 can be installed at any position of the bracket 20. For example, the heat sink 40 is installed on the second wall 22 of the bracket 20. By locking the heat sink 40 to the second wall 22 of the bracket 20, the installation of the heat sink 40 is more stable, and the heat sink 40 and the first wall 21 of the bracket 20 have a stable relative position relationship, which can better limit the expansion of the battery cell assembly 10 in the first direction X. The heat sink 40 is installed on the second wall 22, which facilitates the connection between the heat sink 40 and the bracket 20.

[0091] Specifically, if Figure 2 As shown, along the first direction X, the second wall 22 is located on the side of the heat sink 40 facing the battery cell assembly 10, and a first mounting hole 222 is provided at one end of the second wall 22 facing the heat sink 40, and the heat sink 40 is provided with a second mounting hole 41 corresponding to the first mounting hole 222, and a locking member (not shown in the figure) passes through the second mounting hole 41 and the first mounting hole 222 in sequence, thereby locking the second wall 22 and the heat sink 40, and then installing the heat sink 40 on the bracket 20. Among them, the first mounting hole 222 can be a threaded hole, and the locking member can be a bolt.

[0092] The battery cell assembly 10 is thermally connected to the heat sink 40 .

[0093] The heat sink 40 is thermally connected to the battery cell assembly 10 , and thermally conductive glue, thermally conductive foam, etc. may be provided between the battery cell assembly 10 and the heat sink 40 , or the battery cell assembly 10 may be in direct contact with the heat sink 40 .

[0094] By thermally connecting the battery cell assembly 10 to the heat sink 40, the heat generated by the battery cell assembly 10 during the charging and discharging process of the battery pack 100 can be transferred to the heat sink 40. The heat of the battery cell assembly 10 can be quickly transferred through the heat sink 40, thereby improving the heat dissipation efficiency of the battery cell assembly 10, alleviating the problem of excessive local temperature of the battery cell assembly 10, reducing the risk of safety accidents such as explosion or fire of the battery pack 100, and further improving the safety performance of the battery pack 100.

[0095] The heat sink 40 is a component with good thermal conductivity, so that the heat sink 40 can quickly transfer the heat of the battery cell assembly 10. For example, the heat sink 40 may include a metal plate, a heat sink, and the like.

[0096] like Figure 5 As shown, Figure 5 A schematic diagram of the structure of the heat sink 40 provided in some embodiments of the present application. In some embodiments, the heat sink 40 includes a metal layer 42, a first insulating layer 43 and a second insulating layer 44. Along the first direction X, the first insulating layer 43 is arranged on the side of the metal layer 42 facing the battery cell assembly 10, and the second insulating layer 44 is arranged on the side of the metal layer 42 facing away from the battery cell assembly 10.

[0097] The material of the metal layer 42 may include aluminum, copper, etc.

[0098] The material of the first insulating layer 43 and the material of the second insulating layer 44 may include nano silicon coating, ceramic, rubber, etc. The materials of the first insulating layer 43 and the second insulating layer 44 may be the same or different.

[0099] Since the heat sink 40 includes a metal layer 42 and a first insulating layer 43 and a second insulating layer 44 disposed on both sides of the metal layer 42, the metal layer 42 has good thermal conductivity, which is conducive to quickly transferring the heat of the battery cell assembly 10 and improving the heat dissipation efficiency. The metal layer 42 also makes the heat sink 40 have good mechanical properties, which is conducive to the heat sink 40 having good strength and rigidity, so that the heat sink 40 has good heat dissipation capacity and the ability to limit the battery cell assembly 10. The first insulating layer 43 and the second insulating layer 44 can reduce the risk of short circuit in the internal structure of the battery pack 100 and improve the safety performance of the battery pack 100.

[0100] In some embodiments, the thermal conductivity of the first insulating layer 43 is greater than the thermal conductivity of the second insulating layer 44 .

[0101] The thermal conductivity of the first insulating layer 43 and the thermal conductivity of the second insulating layer 44 are physical quantities that measure the thermal conductivity of the first insulating layer 43 and the second insulating layer 44, respectively, and represent the magnitude of the thermal conductivity of the first insulating layer 43 and the second insulating layer 44. The larger the thermal conductivity, the better the thermal conductivity and thermal conduction capacity.

[0102] By setting the thermal conductivity of the first insulating layer 43 facing the battery cell assembly 10 to be greater than the thermal conductivity of the second insulating layer 44 facing away from the battery cell assembly 10, the heat transfer efficiency between the battery cell assembly 10 and the heat dissipation plate 40 is improved, which is beneficial to improving the heat dissipation efficiency of the battery cell assembly 10.

[0103] like Figure 2 , Figure 4 As shown, in some embodiments, the battery pack 100 further includes a circuit board 50, the battery cell assembly 10 is electrically connected to the circuit board 50, and the circuit board 50 is disposed on the side of the heat sink 40 away from the battery cell assembly 10. The second insulating layer 44 has a relatively small thermal conductivity, which is beneficial to reducing the heat transferred from the heat sink 40 to the circuit board 50 and reducing the impact on the circuit board 50.

[0104] The circuit board 50 is electrically connected to the battery cell assembly 10. The circuit board 50 includes a BMS (Battery Management System) board. Circuit elements, such as information acquisition components, may be provided on the circuit board 50. The circuit board 50 is provided on a side of the heat sink 40 that is away from the battery cell assembly 10. It can be understood that along the first direction X, the heat sink 40 is provided between the circuit board 50 and the battery cell assembly 10.

[0105] The battery pack 100 also includes a circuit board 50, which is arranged on the side of the heat sink 40 away from the battery cell assembly 10. The heat sink 40 can act as a partition between the battery cell assembly 10 and the circuit board 50. In the event that the battery cell assembly 10 catches fire, the heat sink 40 can reduce the risk of the circuit board 50 and other structures on the side where the circuit board 50 are located being burned due to the fire of the battery cell assembly 10, that is, reduce the risk of burning between the electrode assembly and the circuit board 50, thereby improving the safety performance of the battery pack 100.

[0106] like Figure 2 , Figure 4 , Figure 6 As shown, Figure 6 A schematic diagram of the structure of the first electrical connector 60 provided in some embodiments of the present application. In some embodiments, the battery cell assembly 10 has a first electrode portion 114 and a second electrode portion 115 with opposite polarities, and the first electrode portion 114 and the second electrode portion 115 are both electrically connected to the circuit board 50; the battery pack 100 also includes a first electrical connector 60, the first electrical connector 60 connects the first electrode portion 114 and the circuit board 50, and the first electrical connector 60 is thermally connected to the heat sink 40.

[0107] The first electrode portion 114 and the second electrode portion 115 are two electrodes with opposite polarities after all the battery cells 11 are connected in series, in parallel or in mixed connection as a whole. The first electrode portion 114 and the second electrode portion 115 are two electrodes for connecting the battery cell assembly 10 with other conductive structures. In the battery cell assembly 10, at least one first pole tab 113a forms the first electrode portion 114, and at least one second pole tab 113b forms the second electrode portion 115.

[0108] The first electrode portion 114 and the second electrode portion 115 may be located at two opposite ends of the battery cell assembly 10 along the second direction Y. Figure 2 , Figure 4 As shown, the first electrode portion 114 and the second electrode portion 115 may also be located at the same end of the battery cell assembly 10 along the second direction Y. By arranging the first electrode portion 114 and the second electrode portion 115 at the same end of the battery cell assembly 10 in the second direction Y, the risk of interference between the first electrode portion 114 and the second electrode portion 115 and the heat dissipation plate 40 is reduced, and it is also beneficial to reduce the size of the battery cell assembly 10 in the second direction Y, thereby reducing the volume of the battery pack 100.

[0109] The first electrical connector 60 is a conductive structure. The first electrical connector 60 and the first electrode portion 114 can be electrically connected by welding, conductive adhesive, etc. The first electrical connector 60 and the circuit board 50 can be electrically connected by welding, conductive adhesive, etc.

[0110] The first electrical connector 60 is thermally connected to the heat sink 40 , and thermal conductive glue, thermal conductive foam, etc. may be provided between the first electrical connector 60 and the heat sink 40 , or the first electrical connector 60 may be in direct contact with the heat sink 40 .

[0111] The first electrode portion 114 and the circuit board 50 are electrically connected via the first electrical connector 60, making the electrical connection between the first electrode portion 114 and the circuit board 50 more convenient. The first electrical connector 60 is thermally connected to the heat sink 40, so that during the charging and discharging process of the battery pack 100, the heat at the corresponding position of the first electrode portion 114 can be transferred to the heat sink 40, and the heat at the first electrode portion 114 is quickly transferred through the heat sink 40, thereby improving the heat dissipation efficiency of the battery cell assembly 10, alleviating the problem of local overheating of the battery cell assembly 10, and further alleviating the problem of excessively high local temperature of the battery cell assembly 10, reducing the safety accidents such as explosion or fire of the battery pack 100, and further improving the safety performance of the battery pack 100.

[0112] like Figure 4 , Figure 6 As shown, in some embodiments, the first electrical connector 60 includes a first part 61 and a second part 62 that are connected, the first part 61 is located on one side of the battery cell assembly 10 along the second direction Y, and the second part 62 is located on the side of the heat sink 40 away from the battery cell assembly 10, and is thermally connected to the heat sink 40.

[0113] The first electrode portion 114 is located at one side of the cell assembly 10 along the second direction Y. The first portion 61 and the first electrode portion 114 are located at the same side of the cell assembly 10 along the second direction Y. The first portion 61 is connected to the first electrode portion 114 .

[0114] The second portion 62 is folded relative to the first portion 61 to the side of the heat sink 40 away from the battery cell assembly 10. The second portion 62 is thermally connected to the surface of the heat sink 40 away from the battery cell assembly 10. The heat sink 40 and the second portion 62 are thermally connected, and thermal conductive glue, thermal conductive foam, etc. may be provided between the second portion 62 and the heat sink 40, or the second portion 62 may be in direct contact with the heat sink 40.

[0115] The first electrical connector 60 includes a first part 61 and a second part 62 that are connected, and the first part 61 and the first electrode portion 114 are located on the same side of the battery cell assembly 10 along the second direction Y, and the second part 62 is located on the side of the heat sink 40 away from the battery cell assembly 10. This facilitates the electrical connection between the first electrical connector 60 and the first electrode portion 114, and also facilitates the connection between the circuit board 50 and the heat sink 40 and the first electrical connector 60.

[0116] Please continue to refer to Figure 4 , Figure 6In some embodiments, the first electrical connector 60 has a fuse portion 63 , and the fuse portion 63 is located on the current flow path between the first electrode portion 114 and the circuit board 50 .

[0117] The fuse part 63 is the position of the first electrical connector 60 where the current flow capacity is the weakest on the path through which the current flows. When the current flowing through the fuse part 63 exceeds a threshold value or the temperature exceeds a threshold value, the fuse part 63 is fused to disconnect the circuit between the first electrode part 114 and the circuit board 50, thereby reducing the risk of explosion and fire of the battery pack 100 and improving the safety performance of the battery pack 100.

[0118] Combined with reference Figure 4 , Figure 7 , Figure 7 A schematic diagram of the structure of the second electrical connector 70 provided in some embodiments of the present application. In some embodiments, the battery pack 100 further includes a second electrical connector 70, which connects the second electrode portion 115 and the circuit board 50, and is thermally connected to the heat sink 40.

[0119] The second electrical connector 70 is a conductive structure. The second electrical connector 70 and the second electrode portion 115 can be electrically connected by welding, conductive adhesive, etc. The second electrical connector 70 and the circuit board 50 can be electrically connected by welding, conductive adhesive, etc.

[0120] The second electrical connector 70 is thermally connected to the heat sink 40 , and thermally conductive glue, thermally conductive foam, etc. may be provided between the second electrical connector 70 and the heat sink 40 , or the second electrical connector 70 may be in direct contact with the heat sink 40 .

[0121] The second electrode portion 115 and the circuit board 50 are electrically connected via the second electrical connector 70, making the electrical connection between the second electrode portion 115 and the circuit board 50 more convenient. The second electrical connector 70 is thermally connected to the heat sink 40, so that during the charging and discharging process of the battery pack 100, the heat at the corresponding position of the second electrode portion 115 can be transferred to the heat sink 40, and the heat at the second electrode portion 115 is quickly transferred through the heat sink 40, thereby improving the heat dissipation efficiency of the battery cell assembly 10, alleviating the problem of local overheating of the battery cell assembly 10, and further alleviating the problem of excessively high local temperature of the battery cell assembly 10, reducing the safety accidents such as explosion or fire of the battery pack 100, and further improving the safety performance of the battery pack 100.

[0122] Please continue to refer to Figure 4 , Figure 7 In some embodiments, the second electrical connector 70 includes a third portion 71 and a fourth portion 72 that are connected, the third portion 71 is located on one side of the battery cell assembly 10 along the second direction Y, and the fourth portion 72 is located on the side of the heat sink 40 away from the battery cell assembly 10 and is thermally connected to the heat sink 40.

[0123] The second electrode portion 115 is located at one side of the cell assembly 10 along the second direction Y. The third portion 71 is located at the same side of the cell assembly 10 along the second direction Y as the second electrode portion 115 . The third portion 71 is connected to the second electrode portion 115 .

[0124] The fourth portion 72 is folded relative to the third portion 71 to the side of the heat sink 40 away from the battery cell assembly 10. The fourth portion 72 is thermally connected to the surface of the heat sink 40 away from the battery cell assembly 10. The heat sink 40 and the fourth portion 72 are thermally connected, and thermal conductive glue, thermal conductive foam, etc. may be provided between the fourth portion 72 and the heat sink 40, or the fourth portion 72 may be in direct contact with the heat sink 40.

[0125] The second electrical connector 70 includes a third part 71 and a fourth part 72 that are connected, and the third part 71 is located on one side of the battery cell assembly 10 along the second direction Y, and the fourth part 72 is located on the side of the heat sink 40 away from the battery cell assembly 10. This facilitates the electrical connection between the second electrical connector 70 and the second electrode portion 115, and also facilitates the connection between the circuit board 50 and the heat sink 40 and the second electrical connector 70.

[0126] like Figure 4 As shown, in some embodiments, along the first direction X, the second electrode portion 115 is closer to the circuit board 50 than the first electrode portion 114 .

[0127] The first electrode portion 114 is closer to the circuit board 50 than the first electrode portion 114 , which means that the position where the second electrode tab 113 b forming the second electrode portion 115 extends out of the housing 111 is closer to the circuit board 50 along the first direction X than the position where the first electrode tab 113 a forming the first electrode portion 114 extends out of the housing 111 .

[0128] By arranging the second electrode portion 115 closer to the circuit board 50 than the first electrode portion 114 along the first direction X, a larger distance exists between the first electrode portion 114 and the second electrode portion 115 in the first direction X, thereby reducing the risk of internal short circuit of the battery pack 100 and improving the safety performance of the battery pack 100.

[0129] like Figure 8 As shown, Figure 8 Schematic diagram of the battery cell assembly 10 and the insulating bracket 80 provided in some embodiments of the present application after being matched. In some embodiments, the first electrical connector 60 is at least partially disposed on one side of the battery cell assembly 10 along the second direction Y, and the battery pack 100 further includes the insulating bracket 80, and along the second direction Y, the insulating bracket 80 is at least partially located between the first electrical connector 60 and the battery cell assembly 10.

[0130] The first portion 61 of the first electrical connector 60 is located on one side of the cell assembly 10 along the second direction Y. Along the second direction Y, at least a portion of the insulating bracket 80 is located between the first portion 61 and the cell assembly 10 to insulate and separate the second tab 113 b and the first electrical connector 60 .

[0131] Since the battery pack 100 also includes an insulating bracket 80, and along the second direction Y, at least a portion of the insulating bracket 80 is located between the first electrical connector 60 and the battery cell assembly 10, the insulating bracket 80 can insulate and separate the first electrical connector 60 and the pole ear 113 on the side of the first electrical connector 60 facing the battery cell assembly 10, thereby reducing the risk of internal short circuit in the battery pack 100 and improving the safety performance of the battery pack 100.

[0132] like Figure 8-Figure 10 As shown, Fig. 9 This is a schematic diagram of the structure of the insulating bracket 80 provided in some embodiments of the present application. Fig.10 Schematic diagram of the insulating bracket 80 and the first electrical connector 60 provided in some embodiments of the present application. In some embodiments, the insulating bracket 80 is provided with a first plug hole 81, the first plug hole 81 extends along the first direction X, and the first electrical connector 60 is inserted into the first plug hole 81.

[0133] The first electrical connector 60 is inserted into the first insertion hole 81, and a portion of the hole wall portion 811 surrounding the first insertion hole 81 is located on the side of the first electrical connector 60 facing the battery cell assembly 10 in the second direction Y, so that at least a portion of the insulating bracket 80 is located between the first electrical connector 60 and the battery cell assembly 10 along the second direction Y.

[0134] like Fig. 9 As shown, the insulating bracket 80 includes an insulating body 82 and a first limiting portion 83 . The insulating body 82 is located on one side of the battery cell assembly 10 along the second direction Y, and at least a portion of the insulating body 82 is located between the battery cell assembly 10 and the first electrical connector 60 .

[0135] The first limiting portion 83 is disposed on the surface of the insulating body 82 away from the battery cell assembly 10, and the first limiting portion 83 and the insulating body 82 jointly define the first insertion hole 81. Along the first direction X, the size of the first limiting portion 83 is smaller than the size of the insulating body 82, and the insulating body 82 exceeds both ends of the first limiting portion 83, so that the insulating body 82 can insulate and separate the first electrical connector 60 and the battery cell assembly 10 to a larger extent, thereby improving the safety performance of the battery pack 100. The portion of the insulating body 82 that exceeds the first limiting portion 83 in the first direction X can also support the first electrical connector 60, thereby reducing the risk of the first electrical connector 60 collapsing toward the battery cell assembly 10. If the size of the first limiting portion 83 is smaller than the size of the insulating body 82, a portion of the first electrical connector 60 can extend the first insertion hole 81, thereby making the first electrical connector 60 have better heat dissipation capability.

[0136] The insulating bracket 80 further includes two second limiting portions 84. The second limiting portions 84 and the first limiting portions 83 are arranged side by side on the insulating body 82 along the first direction X. The second limiting portions 84 are arranged on the side of the first limiting portion 83 away from the heat sink 40. The two second limiting portions 84 are arranged relatively spaced apart along the third direction Z. The two second limiting portions 84 jointly define a guide channel 85. When viewed along the first direction X, the first plug hole 81 can be located in the guide channel 85. The first electrical connection portion can be inserted into the first plug hole 81 from the guide channel 85, so that the first electrical connection member 60 can be inserted into the first plug hole 81 conveniently.

[0137] The insulating bracket 80 also includes a third limiting portion 86, which is connected to the end of the insulating body 82 closest to the heat sink 40 in the first direction X, and extends from the insulating body 82 along the second direction Y to one side of the heat sink 40, and abuts against the heat sink 40, thereby limiting the heat sink 40 and the insulating bracket 80, thereby improving the stability of the insulating bracket 80.

[0138] The insulating body 82 , the first limiting portion 83 , the second limiting portion 84 and the third limiting portion 86 may be separately provided and connected as a whole.

[0139] The insulating bracket 80 may be an integrally formed structure. For example, the insulating bracket 80 is manufactured by an integrally formed method such as injection molding, hot pressing, etc.

[0140] By providing the first plug hole 81 on the insulating bracket 80 and inserting the first electrical connector 60 into the first plug hole 81, the first electrical connector 60 can be stabilized and strengthened, thereby improving the stability of the first electrical connector 60 and reducing the risk of the first electrical connector 60 being damaged or deformed by external forces.

[0141] In the embodiment where the first electrical connector 60 has a fuse portion 63, at least a portion of the insulating bracket 80 is located on a side of the fuse portion 63 facing the battery cell assembly 10. Fig.10 As shown, the fuse part 63 can be located outside the first plug hole 81. The fuse part 63 can be located in the first portion 61, the fuse part 63 is located on the side of the first plug hole 81 facing the heat dissipation plate 40, and the part of the insulating body 82 that exceeds the first limit part 83 facing the heat dissipation plate 40 in the first direction X is located on the side of the fuse part 63 facing the battery cell assembly 10.

[0142] By positioning at least a portion of the insulating bracket 80 on the side of the fuse part 63 facing the battery cell assembly 10, the insulating bracket 80 can prevent the slag generated by the melting of the fuse part 63 from contacting the tab 113 or the main body 112 on the side of the insulating bracket 80 facing the battery cell assembly 10, thereby reducing the risk of internal short circuit in the battery pack 100 and secondary thermal runaway in the battery pack 100, and improving the safety performance of the battery pack 100.

[0143] like Fig. 9 , Fig.10 As shown, in some embodiments, the insulating bracket 80 includes a hole wall portion 811 surrounding the first plug hole 81, the hole wall portion 811 is provided with a first through hole 87, and the first through hole 87 is connected to the first plug hole 81; the hole wall portion 811 includes a first hole wall portion 8111, the first hole wall portion 8111 is located at one end of the insulating bracket 80 away from the battery cell assembly 10, and the first hole wall portion 8111 is provided with a first through hole 87.

[0144] A portion of the insulating body 82 and the first limiting portion 83 form a hole wall portion 811 surrounding the first insertion hole 81. In some embodiments, the first limiting portion 83 is a first hole wall portion 8111.

[0145] The first hole wall portion 8111 may be provided with one first through hole 87, or may be provided with a plurality of first through holes 87. The other hole walls of the first insertion hole 81 may also be provided with first through holes 87. In the embodiment where the first hole wall portion 8111 is provided with a plurality of first through holes 87, the plurality of first through holes 87 are arranged at intervals. The apertures of the plurality of first through holes 87 may be the same or different.

[0146] By providing a first through hole 87 connected to the first plug hole 81 on the hole wall portion 811 surrounding the first plug hole 81, it is beneficial for the first electrical connector 60 to dissipate heat from the first through hole 87, alleviate the problem of high temperature of the first electrical connector 60, and improve the safety and reliability of the battery pack 100. The first through hole 87 is provided on the first hole wall portion 8111 of the insulating bracket 80 at one end away from the battery cell assembly 10, which facilitates heat dissipation and helps to reduce the weight of the battery pack 100.

[0147] Combined with reference Figure 8 , Figure 11-13 , Fig.11 A schematic diagram of the cooperation between the battery cell assembly 10 and other structures provided in some embodiments of the present application; Fig.12 A schematic structural diagram of a tab support 90 provided in some embodiments of the present application along a first viewing angle; Fig.13 A schematic diagram of the structure of the tab bracket 90 provided in some embodiments of the present application along the second viewing angle. In some embodiments, the battery pack 100 further includes a tab bracket 90, the tab bracket 90 is located on one side of the main body 112 along the second direction Y, and a protrusion 101 is provided on the side of the tab bracket 90 facing the battery cell assembly 10, and at least a portion of the protrusion 101 is located between two adjacent tabs 113 along the first direction X.

[0148] The tab bracket 90 is disposed on one side of the battery cell assembly 10 along the second direction Y. The tab bracket 90 can be connected to the second wall 22 of the bracket 20, and the tab bracket 90 and the second wall portion 2212 are disposed opposite to each other along the second direction Y, so that the tab bracket 90 and the second wall 22 of the bracket 20 are jointly disposed around the periphery of the battery cell assembly 10, which can better protect the battery cell assembly 10.

[0149] Along the second direction Y, the end of the protrusion 101 away from the tab support 90 may abut against the main body 112 of the battery cell 11, or there may be a gap between the main body 112 of the battery cell 11. Along the first direction X, the two opposite side surfaces of the protrusion 101 may have a gap between the tab 113, or they may contact the tab 113. Among them, the two adjacent tabs 113 in the first direction X may be the first tab 113a and the second tab 113b, or both may be the first tab 113a, or both may be the second tab 113b.

[0150] Only a portion of each protrusion 101 may be located between two adjacent pole tabs 113 in the first direction X, or the entirety of each protrusion 101 may be located between two adjacent pole tabs 113 in the first direction X.

[0151] By providing a protrusion 101 on the side of the pole lug support 90 facing the battery cell assembly 10, and at least a portion of the protrusion 101 is located between two adjacent pole lugs 113 in the first direction X, the protrusion 101 can support the pole lug 113, which is beneficial for the pole lug 113 to maintain a state of extending along the second direction Y, reduce the risk of the pole lug 113 being invertedly inserted into the main body 112, and improve the safety performance of the battery pack 100.

[0152] In some embodiments, the end of the battery cell assembly 10 facing the pole lug support 90 has at least one row of pole lugs 113, and each row of pole lugs 113 includes multiple pole lugs 113 arranged along the first direction X; the pole lug support 90 is provided with at least one row of protrusions 101, and each row of protrusions 101 is arranged corresponding to a row of pole lugs 113, and each row of protrusions 101 includes multiple protrusions 101 arranged at intervals along the first direction X, and at least one pole lug 113 is arranged between two adjacent protrusions 101.

[0153] In the embodiment where the first pole tab 113a and the second pole tab 113b of the battery cell 11 are located at the same end of the main body 112 along the second direction Y, the battery pack 100 may be provided with only one pole tab holder 90. Then the side of the battery cell assembly 10 facing the pole tab holder 90 has two rows of pole tabs 113 arranged at intervals along the third direction Z, and the side of the pole tab holder 90 facing the battery cell assembly 10 is provided with two rows of protrusions 101. In this embodiment, the protrusions 101 corresponding to the two rows of protrusions 101 in the third direction Z may be arranged at intervals or may be connected. Fig.13FIG. 3 shows a situation where two rows of protrusions 101 corresponding to the protrusions 101 in the third direction Z are integrally formed.

[0154] In an embodiment where the first pole tab 113a and the second pole tab 113b of the battery cell 11 are respectively located at opposite ends of the main body 112 along the second direction Y, the battery pack 100 can be provided with two pole tab brackets 90, and the battery cell assembly 10 has a row of pole tabs 113 on one side facing each pole tab bracket 90, and a row of protrusions 101 is provided on the side of the pole tab bracket 90 facing the battery cell assembly 10.

[0155] The polarities of all the pole lugs 113 in each row of pole lugs 113 may be the same or different. At least a portion of each protrusion 101 is located between two adjacent pole lugs 113 along the first direction X. At least one pole lug 113 is disposed between two adjacent protrusions 101, and each protrusion 101 can play a role in supporting the pole lug 113.

[0156] Each row of protrusions 101 includes a plurality of protrusions 101 spaced apart along the first direction X, and at least one pole ear 113 is provided between two adjacent protrusions 101. Then, in each row of pole ears 113, as many adjacent pole ears 113 as possible have protrusions 101 between them, which is beneficial for the pole ears 113 to maintain a state of extending along the second direction Y, reduces the risk of the pole ears 113 being invertedly inserted into the main body 112, and improves the safety performance of the battery pack 100.

[0157] In some embodiments, at least one pole tab 113 is bent around the pole tab support 90 to the side of the pole tab support 90 away from the main body 112. The pole tab 113 is bent around the positive pole tab support 90 to the side of the pole tab support 90 away from the main body 112 and connected to other pole tabs 113 on the side of the pole tab support 90 away from the main body 112, so that the pole tab support 90 can also block the pole tab 113, reduce the risk of the pole tab 113 being inserted into the main body 112, and improve the safety of the battery cell 11.

[0158] In some embodiments, the tab support 90 is provided with a second insertion hole 91 , which penetrates the tab support 90 along the second direction Y. At least one tab 113 is inserted into the second insertion hole 91 and bent around the tab support 90 to the side of the tab support 90 away from the main body 112 .

[0159] Part of the tab 113 may be passed through the second insertion hole 91 and bent around the tab support 90 to the side of the tab support 90 away from the main body 112 , while another part of the tab 113 may be bent around the edge of the tab support 90 to the side of the tab support 90 away from the main body 112 .

[0160] Alternatively, all the tabs 113 may be inserted into the second insertion holes 91 and bent around the tab support 90 to a side of the tab support 90 away from the main body 112 .

[0161] The second insertion holes 91 and the tabs 113 may be arranged in a one-to-one correspondence, and each second insertion hole 91 allows one tab 113 to pass through.

[0162] A second plug hole 91 is provided through the pole lug bracket 90, and the second plug hole 91 penetrates the pole lug bracket 90 along the second direction Y. At least one pole lug 113 is inserted into the second plug hole 91 and bent around the pole lug bracket 90 to the side of the pole lug bracket 90 away from the main body 112. The setting of the second plug hole 91 can not only stabilize the pole lug 113, but also reduce the path of the pole lug 113 extending to the side of the pole lug bracket 90 away from the main body 112, thereby facilitating the pole lug 113 to form an electrical connection with other pole lugs 113.

[0163] In some embodiments, the tab support 90 is further provided with a second through hole 92 . Along the first direction X, the second through hole 92 passes through two sides of the tab support 90 .

[0164] The number of the second through hole 92 can be one or more. The second through hole 92 can be arranged to avoid the protrusion 101, and the second through hole 92 can also penetrate the protrusion 101 along the second direction Y on both sides.

[0165] The second through hole 92 is provided to facilitate heat dissipation of the battery cell assembly 10 and reduce the weight of the tab support 90 .

[0166] In some embodiments, the insulating bracket 80 and the tab bracket 90 are located on the same side of the battery cell assembly 10 along the second direction Y. In an embodiment where the tab bracket 90 is provided with a second insertion hole 91, the tab 113 extends to the side of the tab bracket 90 away from the battery cell assembly 10 after passing through the second insertion hole 91, and at least a portion of the tab 113 passing through the second insertion hole 91 is located on the side of the insulating bracket 80 facing the battery cell assembly 10 in the second direction Y, and at least a portion of the first electrical connector 60 is located on the side of the insulating body 82 of the insulating bracket 80 away from the battery cell assembly 10 in the second direction Y, so that at least a portion of the insulating bracket 80 is located between the first electrical connector 60 and the battery cell assembly 10, so that the insulating bracket 80 can insulate and separate the first electrical connector 60 and the tab 113 passing through the second insertion hole 91, reduce the risk of short circuit of the battery pack 100, and improve the safety performance of the battery pack 100.

[0167] An embodiment of the present application further provides an electric device, which includes the battery pack 100 provided in any of the above embodiments.

[0168] The battery pack 100 serves as a power source for the electrical device, and the battery pack 100 provides electrical energy for the electrical device to operate.

[0169] The battery pack 100 provided in any of the above embodiments has good safety performance, so that the electrical equipment powered by the battery pack 100 has good power safety and reliability.

[0170] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes.

Claims

1. A battery pack, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells stacked along a first direction; a bracket having a first wall; A heat sink is mounted on the bracket and arranged opposite to the first wall along the first direction. The battery cell assembly is arranged between the first wall and the heat sink, and the battery cell assembly is thermally connected to the heat sink.

2. The battery pack according to claim 1, characterized in that: The bracket further includes a second wall, which is connected to the first wall and extends along an edge of the first wall, and the heat dissipation plate is installed on the second wall.

3. The battery pack according to claim 1, characterized in that: The heat sink includes a metal layer, a first insulating layer and a second insulating layer. Along the first direction, the first insulating layer is arranged on a side of the metal layer facing the battery cell assembly, and the second insulating layer is arranged on a side of the metal layer facing away from the battery cell assembly.

4. The battery pack according to claim 3, characterized in that: The thermal conductivity of the first insulating layer is greater than the thermal conductivity of the second insulating layer.

5. The battery pack according to claim 1, characterized in that: The battery pack further comprises a box body, wherein the box body is formed with a containing space, and the battery cell assembly, the bracket and the heat dissipation plate are all contained in the box body.

6. The battery pack according to claim 1, characterized in that: The battery pack further includes a circuit board, the battery cell assembly is electrically connected to the circuit board, and the circuit board is arranged on a side of the heat dissipation plate away from the battery cell assembly.

7. The battery pack according to claim 6, characterized in that: The battery cell assembly comprises a first electrode portion and a second electrode portion with opposite polarities, and the first electrode portion and the second electrode portion are both electrically connected to the circuit board; The battery pack further includes a first electrical connector, the first electrical connector connects the first electrode portion and the circuit board, and the first electrical connector is thermally connected to the heat sink.

8. The battery pack according to claim 7, characterized in that: The first electrical connector includes a first part and a second part that are connected. The first part is located on one side of the battery cell assembly along a second direction, and the second part is located on a side of the heat sink away from the battery cell assembly and is thermally connected to the heat sink. The second direction is perpendicular to the first direction.

9. The battery pack according to claim 7, characterized in that: The battery pack further includes a second electrical connector, the second electrical connector connects the second electrode portion and the circuit board, and the second electrical connector is thermally connected to the heat sink.

10. The battery pack according to claim 9, characterized in that: The second electrical connector includes a third part and a fourth part that are connected. The third part is located on one side of the battery cell assembly along the second direction, and the fourth part is located on a side of the heat sink away from the battery cell assembly and is thermally connected to the heat sink. The second direction is perpendicular to the first direction.

11. The battery pack according to claim 7, characterized in that: The first electrode portion and the second electrode portion are located at the same end of the battery cell assembly along a second direction, and the second direction is perpendicular to the first direction.

12. The battery pack according to claim 11, characterized in that: Along the first direction, the second electrode portion is closer to the circuit board than the first electrode portion.

13. The battery pack according to claim 7, characterized in that: The battery cell comprises a main body and a first pole ear and a second pole ear with opposite polarities, wherein the first pole ear and the second pole ear are arranged at an end of the main body along a second direction, and in the battery cell assembly, at least one of the first pole ears forms the first electrode portion, and at least one of the second pole ears forms the second electrode portion, and the second direction is perpendicular to the first direction; The first electrical connector is at least partially disposed on one side of the battery cell assembly along the second direction; The battery pack further includes an insulating support, and along the second direction, the insulating support is at least partially located between the first electrical connector and the battery cell assembly.

14. The battery pack according to claim 13, characterized in that: The insulating support is provided with a first plug hole, the first plug hole extends along the first direction, and the first electrical connector is inserted into the first plug hole.

15. The battery pack according to claim 14, characterized in that: The insulating support includes a hole wall portion surrounding the first plug hole, the hole wall portion includes a first hole wall portion, the first hole wall portion is located at an end of the insulating support away from the battery cell assembly, the first hole wall portion is provided with a first through hole, and the first through hole is connected to the first plug hole.

16. The battery pack according to claim 13, characterized in that: The first electrical connector has a fuse portion, which is located on a current flow path between the first electrode portion and the circuit board. At least a portion of the insulating bracket is located on a side of the fuse portion facing the battery cell assembly.

17. The battery pack according to any one of claims 1 to 16, characterized in that: The battery cell comprises a main body and a tab, wherein the tab is connected to an end of the main body along a second direction, and the first direction is perpendicular to the second direction; The battery pack further comprises a tab support, a protrusion is provided on a side of the tab support facing the battery cell assembly, and at least a portion of the protrusion is located between two adjacent tabs along the first direction.

18. The battery pack according to claim 17, characterized in that: The end of the battery cell assembly facing the pole lug support has at least one row of pole lugs, and each row of pole lugs includes a plurality of pole lugs arranged along the first direction; The tab support is provided with at least one row of protrusions, each row of protrusions is arranged corresponding to a row of tabs, each row of protrusions includes a plurality of protrusions arranged at intervals along the first direction, and at least one tab is arranged between two adjacent protrusions.

19. An electrical equipment, characterized in that: Comprising a battery pack according to any one of claims 1-18.

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