Battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery pack and electric equipment, the battery pack comprises a battery module, a support, a busbar and a sampling circuit board; the bracket is arranged at one end of the battery module; the busbar is electrically connected with the battery module, and the bracket is positioned between the busbar and the battery module; the sampling circuit board is arranged on the side, away from the battery module, of the busbar. According to the embodiment of the invention, the integration level of the battery pack can be improved, and the utilization rate of the internal space of the battery pack can be improved.

Description

Technical Field

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

[0002] In the field of new energy technology, such as new energy vehicles, battery packs are the core components and power source of new energy vehicles.

[0003] A battery pack typically consists of battery modules, which are usually connected by busbars for current transmission. Specifically, a battery module generally comprises multiple cells, which are connected in series or parallel via connectors, and finally, current is transmitted through a busbar. Additionally, the battery pack includes a sampling circuit board for collecting parameters of each cell, such as voltage or temperature. However, in related technologies, the above structure is complex and reduces the space utilization of the battery pack. Utility Model Content

[0004] This application provides a battery pack and an electrical device that can improve the integration of the battery pack and thus improve the space utilization of the battery pack.

[0005] A first aspect of this application provides a battery pack comprising at least:

[0006] Battery module;

[0007] A bracket, wherein the bracket is disposed at one end of the battery module;

[0008] A busbar, which is electrically connected to the battery module, and a bracket located between the busbar and the battery module;

[0009] And a sampling circuit board, which is disposed on the side of the busbar away from the battery module.

[0010] In this embodiment, the bracket is placed at one end of the battery module, the busbar is electrically connected to the battery module, the bracket is located between the busbar and the battery module, and the sampling circuit board is placed on the side of the busbar away from the battery module. In this way, the bracket, busbar and sampling circuit board are stacked in sequence, which has a high degree of integration, can save distribution space and improve space utilization. Therefore, the battery pack provided in this embodiment has a high degree of integration, can effectively utilize the battery pack space, and thus can improve the utilization rate of the internal space of the battery pack.

[0011] In one possible implementation, the bracket has a first limiting groove, and at least a portion of the busbar is fixed within the first limiting groove.

[0012] In one possible implementation, the battery module includes a plurality of battery cells, the electrode portions of which are sequentially electrically connected along a first direction;

[0013] The extension direction of the first limiting groove is the same as the first direction.

[0014] In one possible implementation, the battery module further includes a connecting piece; the electrode portions of the plurality of battery cells are electrically connected through the connecting piece.

[0015] In one possible implementation, the sampling circuit board includes a plurality of sampling elements connected to the connecting piece or the housing of the battery cell.

[0016] In one possible implementation, the bus includes a first portion and a second portion, the first portion being electrically connected to the second portion, and the second portion being used for electrical connection to the electrode portion;

[0017] The first part is fixed inside the first limiting groove.

[0018] In one possible implementation, the width of the first limiting groove is greater than the width of the first portion.

[0019] In one possible implementation, the distance between the side edge of the first portion and the side edge of the adjacent first limiting groove is 0.4mm-0.6mm.

[0020] In one possible implementation, an explosion-proof valve is provided at the end of the battery cell facing the busbar, and the orthographic projection of the explosion-proof valve on the bracket does not overlap with the orthographic projection of the busbar on the bracket.

[0021] In one possible implementation, the bracket is further provided with a second limiting groove, and the second part is fixed in the second limiting groove.

[0022] In one possible implementation, the width of the second limiting groove is greater than the width of the second portion.

[0023] In one possible implementation, the distance between the side edge of the second portion and the side edge of the adjacent second limiting groove is 0.4mm-0.6mm.

[0024] In one possible implementation, a first insulating layer is provided on at least one side of the bus.

[0025] In one possible implementation, the first insulating layer is made of any one or more of epoxy resin, polyimide, or mica.

[0026] In one possible implementation, the sampling circuit board is fixed to the side of the bus away from the battery module.

[0027] In one possible implementation, the sampling circuit board is attached to the side of the busbar facing away from the battery module via adhesive backing.

[0028] In one possible implementation, a second insulating layer is provided on at least one side of the sampling circuit board.

[0029] In one possible implementation, the second insulating layer is made of any one or more of epoxy resin, polyimide, or mica.

[0030] In one possible implementation, the system further includes a tray in which the battery module, the bracket, the busbar, and the sampling circuit board are all located.

[0031] In one possible implementation, the tray includes: a bottom wall and a side wall connected to the bottom wall;

[0032] The space between the sidewall and the busbar is filled with a thermally conductive material.

[0033] In one possible implementation, the thermally conductive material is a thermally conductive adhesive.

[0034] In one possible implementation, the orthographic projection of the explosion-proof valve on the bracket does not overlap with the orthographic projection of the thermally conductive material on the bracket.

[0035] In one possible implementation, the orthographic projection of the busbar on the support lies within the orthographic projection of the thermally conductive material on the support.

[0036] In one possible implementation, it further includes: a protective cover; the protective cover is located between the sampling circuit board and the sidewall, and the orthographic projection of the busbar on the sidewall is located within the orthographic projection of the protective cover on the sidewall.

[0037] In one possible implementation, a liquid cooling plate is provided on the side of the bottom wall facing the busbar.

[0038] A second aspect of this application provides an electrical device comprising at least one of the battery packs described above.

[0039] By incorporating the aforementioned battery pack into the electrical equipment, the performance of the electrical equipment can be improved. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of a battery pack provided in an embodiment of this application;

[0042] Figure 2 for Figure 1 Enlarged view of point A;

[0043] Figure 3 This is a schematic diagram of the structure of the support and busbar in the battery pack provided in the embodiments of this application;

[0044] Figure 4 for Figure 3 Enlarged view of point B;

[0045] Figure 5 This is a schematic diagram of another structure of the battery pack provided in an embodiment of this application;

[0046] Figure 6 This is a schematic diagram of a tray in a battery pack provided in an embodiment of this application;

[0047] Figure 7 This is a schematic diagram of another structure of the tray in the battery pack provided in an embodiment of this application.

[0048] Figure label:

[0049] 100-battery pack;

[0050] 110 - Battery Module;

[0051] 111-cell;

[0052] 1111 - Explosion-proof valve;

[0053] 1112 - Electrode section;

[0054] 112-Connecting piece;

[0055] 121-Bus; 1211-Part 1; 1212-Part 2;

[0056] 122-Bracket; 1221-First limiting groove; 1222-Second limiting groove;

[0057] 130 - Sampling circuit board;

[0058] 131 - Sample;

[0059] 140-pallet;

[0060] 141 - Bottom wall; 142 - Side wall;

[0061] 150 - Thermally conductive material;

[0062] 160 - Protective cover;

[0063] 170-Liquid Cooling Plate;

[0064] L1 - First direction. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0066] With the development of new energy sources, more and more fields are adopting new energy sources as power sources. Due to their advantages such as high energy density, rechargeability, safety, and environmental friendliness, power batteries are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0067] Power batteries are the core component of new energy vehicles and also the power source for them.

[0068] Power batteries generally consist of battery modules. In related technologies, busbars are typically used to connect the battery modules for current transmission. Specifically, a battery module generally includes multiple cells, which are connected in series or parallel via connectors, and finally, current is transmitted through a busbar. Additionally, the battery pack also includes a sampling circuit board, which is used to collect parameters of each cell, such as voltage or temperature.

[0069] However, in related technologies, the above-mentioned structure is complex and reduces the space utilization of the battery pack.

[0070] To address the aforementioned problems, this application provides a novel battery pack and electrical device. The battery pack includes a battery module, a support frame, a busbar, and a sampling circuit board. The support frame is disposed at one end of the battery module. The busbar is electrically connected to the battery module, and the support frame is located between the busbar and the battery module. The sampling circuit board is disposed on the side of the busbar facing away from the battery module. This application improves the integration of the battery pack, thereby increasing the utilization rate of the internal space of the battery pack.

[0071] The structure of the battery pack and the electrical device having the battery pack provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0072] Figure 1 This is a schematic diagram of a battery pack provided in an embodiment of this application. Figure 2 for Figure 1 Enlarged diagram of point A. Figure 3 This is a schematic diagram of the structure of the support and busbar in the battery pack provided in an embodiment of this application. Figure 4 for Figure 3 Enlarged diagram of point B.

[0073] Reference Figure 1 and Figure 2 As shown, this application embodiment provides a battery pack 100, which may include at least a battery module 110, a busbar 121 and a bracket 122, wherein the bracket 122 may be disposed at one end of the battery module 110.

[0074] In this embodiment, the busbar 121 is electrically connected to the battery module 110, and the bracket 122 can be located between the busbar 121 and the battery module 110.

[0075] In this embodiment of the application, the battery pack 100 may further include a sampling circuit board 130 (Flexible Printed Circuit, FPC), wherein the sampling circuit board 130 may be disposed on the side of the bus 121 opposite to the battery module 110.

[0076] By placing the bracket at one end of the battery module, electrically connecting the busbar to the battery module, and positioning the bracket between the busbar and the battery module, and placing the sampling circuit board on the side of the busbar away from the battery module, the bracket, busbar, and sampling circuit board are stacked sequentially, resulting in high integration, saving distribution space, and improving space utilization. Therefore, the battery pack provided in this embodiment has a high degree of integration, effectively utilizes the battery pack space, and thus improves the utilization rate of the internal space of the battery pack.

[0077] In one possible implementation, the sampling circuit board 130 may be attached to the side of the busbar 121 facing away from the battery module 110 by adhesive.

[0078] It should be noted that, in this embodiment of the application, the sampling circuit board 130 is a circuit board made of a flexible substrate, which can be widely used in electrical equipment that requires flexibility and space efficiency.

[0079] In the embodiments of this application, such as Figure 3 and Figure 4As shown, a first limiting groove 1221 can be provided on the bracket 122, and at least a part of the busbar 121 can be fixed in the first limiting groove 1221.

[0080] By providing a first limiting groove 1221 on the bracket 122, at least a portion of the busbar 121 and at least a portion of the sampling circuit board 130 are sequentially arranged in the first limiting groove 1221 of the bracket 122, which helps to limit and fix the busbar 121 and the sampling circuit board 130. In this way, the battery pack 100 has a high degree of integration and can effectively utilize the space of the battery pack 100.

[0081] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the battery module 110 may include a plurality of battery cells 111, wherein the plurality of battery cells 111 may be electrically connected sequentially along the first direction L1.

[0082] In one possible implementation, the extension direction of the first limiting groove 1221 can be the same as the first direction L1.

[0083] In this embodiment, the battery cell 111 may include an electrode portion 1112. The electrode portions 1112 of multiple battery cells 111 may be electrically connected sequentially along a first direction L1, and the busbar 121 is electrically connected to the electrode portion 1112 of the battery cell 111 located at the end of the battery module 110. It is understood that the electrode portion 1112 may be a tab or a post, etc., and this embodiment does not limit it or is not limited to the above examples.

[0084] like Figure 3 and Figure 4 As shown in the embodiment of this application, the bus 121 may include a first part 1211 and a second part 1212, wherein the first part 1211 is electrically connected to the second part 1212, and the second part 1212 is used to be electrically connected to the electrode portion 1112 of the battery cell 111 located at the end in the battery module 110.

[0085] In the embodiments of this application, such as Figure 4 As shown, the battery module 110 may further include a connecting piece 112, through which the electrode portions 1112 of the multiple cells 111 can be electrically connected.

[0086] In addition, in the embodiments of this application, reference is continued to be made to Figure 4 As shown, the sampling circuit board 130 may include multiple sampling components 131, which may be connected to the connecting piece 112 or the housing of the battery cell 111. It should be noted that the housing of the battery cell 111 is a conductive housing.

[0087] It should be noted that, in this embodiment of the application, the first part 1211 can be fixed in the first limiting groove 1221.

[0088] In this embodiment, the width of the first limiting groove 1221 can be greater than the width of the first portion 1211. This helps the first portion 1211 to be better accommodated within the first limiting groove 1221, resulting in a better limiting effect.

[0089] In this embodiment of the application, the distance between the side edge of the first portion 1211 and the side edge of the adjacent first limiting groove 1221 can be 0.4mm-0.6mm. In other words, the single-sided gap between the first portion 1211 and the first limiting groove 1221 can be 0.4mm-0.6mm.

[0090] For example, the single-sided gap between the first part 1211 and the first limiting groove 1221 can be 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.4mm, etc. The embodiments of this application do not limit this, nor are they limited to the above examples.

[0091] It should be noted that the numerical values ​​and ranges involved in this application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors, which can be considered negligible by those skilled in the art.

[0092] It is understood that, in this embodiment, an explosion-proof valve 1111 may be provided at the end of the battery cell 111 facing the busbar 121, and the orthographic projection of the explosion-proof valve 1111 on the bracket 122 does not overlap with the orthographic projection of the busbar 121 on the bracket 122. In this way, the busbar 121 is relatively far away from the explosion-proof valve 1111, which can prevent the electrolyte from being sprayed directly onto the busbar 121 when the battery cell 111 opens, thus avoiding the problem of high-voltage arcing.

[0093] In addition, such as Figure 3 and Figure 4 As shown in the embodiment of this application, a second limiting groove 1222 may also be provided on the bracket 122, and the second part 1212 may be fixed in the second limiting groove 1222.

[0094] In this embodiment, the width of the second limiting groove 1222 can be greater than the width of the second portion 1212. This helps the second portion 1212 to be better accommodated within the second limiting groove 1222, resulting in a better limiting effect.

[0095] In this embodiment, the distance between the side edge of the second portion 1212 and the side edge of the adjacent second limiting groove 1222 is 0.4mm-0.6mm. In other words, the single-sided gap between the second portion 1212 and the second limiting groove 1222 can be 0.4mm-0.6mm.

[0096] For example, the single-sided gap between the second part 1212 and the second limiting groove 1222 can be 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.4mm, etc. The embodiments of this application do not limit this, nor are they limited to the above examples.

[0097] In some embodiments, a first insulating layer (not shown) may be provided on at least one side of the bus 121. For example, the first insulating layer may be provided on one side of the bus 121, or it may be provided on both sides of the bus 121. The first insulating layer can serve as an insulating layer.

[0098] Specifically, in the embodiments of this application, the material used for the first insulating layer can be any one or more of epoxy resin, polyimide, or mica.

[0099] In this embodiment, the sampling circuit board 130 can be fixed on the side of the busbar 121 that is away from the battery module 110.

[0100] It should be noted that, in one possible implementation, the sampling circuit board 130 can be attached to the side of the busbar 121 facing away from the battery module 110 by means of adhesive backing.

[0101] Additionally, in some embodiments, a second insulating layer (not shown) may be provided on at least one side of the sampling circuit board 130. The second insulating layer serves as an insulating layer.

[0102] Specifically, in the embodiments of this application, the material used for the second insulating layer is any one or more of epoxy resin, polyimide, or mica.

[0103] Figure 5 This is a schematic diagram of another structure of the battery pack 100 provided in an embodiment of this application. Figure 6 This is a schematic diagram of a tray in a battery pack 100 provided in an embodiment of this application. Figure 7 This is a schematic diagram of another structure of the tray in the battery pack 100 provided in the embodiments of this application.

[0104] like Figure 5 and Figure 6 As shown in the embodiments of this application, the battery pack 100 may further include a tray 140, wherein the battery module 110, the bus 121 assembly 120 and the sampling circuit board 130 may all be located in the tray 140.

[0105] Continue to refer to Figure 5 and Figure 6As shown in the embodiment of this application, the tray 140 may include: a bottom wall 141 and a side wall 142 connected to the bottom wall 141, wherein a thermally conductive material 150 may be filled between the side wall 142 and the busbar 121.

[0106] In some embodiments, a third insulating layer (not shown) may be provided on the surface of the tray 140. The third insulating layer serves as an insulating layer. In addition, the thermally conductive material 150 filling the gap between the sidewall 142 of the tray 140 and the busbar 121 also serves as an insulating layer, thereby enhancing the overall safety of the battery pack 100.

[0107] Similarly, in the embodiments of this application, the material used for the third insulating layer can be any one or more of epoxy resin, polyimide, or mica.

[0108] In this embodiment, the orthographic projection of the explosion-proof valve 1111 on the bracket 122 does not overlap with the orthographic projection of the thermally conductive material 150 on the bracket 122. This ensures the normal opening of the explosion-proof valve 1111.

[0109] In this embodiment, the orthographic projection of the bus 121 onto the bracket 122 lies within the orthographic projection of the thermally conductive material 150 onto the bracket 122. This ensures sufficient heat dissipation from the bus 121.

[0110] It should be noted that, in the embodiments of this application, the thermally conductive material 150 can be, for example, a thermally conductive adhesive.

[0111] By filling the gap between the side wall 142 of the tray 140 and the busbar 121 with thermally conductive adhesive, the heat generated by the busbar 121 can be transferred to the tray 140 in a timely manner through the thermally conductive adhesive, thereby helping to achieve active heat dissipation of the busbar 121. In addition, the busbar 121 being covered with thermally conductive adhesive helps to achieve uniform heat dissipation of the busbar 121.

[0112] Furthermore, in some embodiments, by filling the gap between the sidewall 142 of the tray 140 and the busbar 121 with thermally conductive adhesive, the vibration strength of the entire battery pack 100 can be improved while dissipating heat.

[0113] In this embodiment of the application, the battery pack 100 may further include a protective cover 160, wherein the protective cover 160 may be located between the sampling circuit board 130 and the side wall 142, and the orthographic projection of the busbar 121 on the side wall 142 is located within the orthographic projection of the protective cover 160 on the side wall 142.

[0114] like Figure 6 and Figure 7As shown in this embodiment, a liquid cooling plate 170 may be provided on the side of the bottom wall 141 facing the busbar 121. By integrating the liquid cooling plate 170 into the bottom wall 141 of the tray 140, the heat generated by the busbar 121 can be evenly transferred to the side wall 142 of the tray 140 and the liquid cooling plate 170 on the bottom wall 141 through the thermally conductive material 150, thereby achieving rapid heat dissipation.

[0115] In addition, this application embodiment also provides an electrical device, which may include at least the battery pack 100 described above.

[0116] The electrical equipment of this utility model can be conventional electrical equipment in the field, such as power equipment (e.g., electric vehicles), electronic equipment (e.g., computers, mobile phones, digital cameras, printers, fax machines, etc.), wearable devices (e.g., watches, bracelets, VR glasses, etc.), and home appliances (e.g., air conditioners, refrigerators, washing machines, microwave ovens, etc.), etc., and there are no particular limitations.

[0117] Taking a vehicle as an example, the vehicle can be a sedan, bus, or truck. For instance, the vehicle can be an electric vehicle (EV), a pure electric vehicle / battery electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, or any vehicle equipped with a battery.

[0118] The vehicle may also include a body, an axle, and a motor, wherein the battery pack 100, the axle, and the motor may all be mounted on the body. The battery pack 100 may be electrically connected to the motor, and the motor may be connected to the axle. The battery pack 100 can supply power to the motor, enabling the motor to rotate, which in turn drives the axle to rotate, thus allowing the vehicle to move.

[0119] The vehicle body may include a vehicle chassis and a body mounted on the chassis. The body may have a passenger compartment, which may include a driver's seat, passenger seats, etc., where the driver can operate the vehicle. For example, the vehicle body may also include structural components such as a steering wheel, clutch, and brakes to enable the vehicle to perform its full functions; this application does not impose any limitations on these components.

[0120] By incorporating the aforementioned battery pack 100 into electrical equipment, the performance of the electrical equipment can be improved.

[0121] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0122] In the description of this utility model, it should be understood that the terms "may include" and "have" as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0123] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery pack, characterized in that, include: Battery module; A bracket, wherein the bracket is disposed at one end of the battery module; A busbar, which is electrically connected to the battery module, and a bracket located between the busbar and the battery module; And a sampling circuit board, which is disposed on the side of the busbar away from the battery module.

2. The battery pack according to claim 1, characterized in that, The bracket has a first limiting groove, and at least a portion of the busbar is fixed within the first limiting groove.

3. The battery pack according to claim 2, characterized in that, The battery module includes multiple battery cells, and the electrode portions of the multiple battery cells are electrically connected sequentially along a first direction; The extension direction of the first limiting groove is the same as the first direction.

4. The battery pack according to claim 3, characterized in that, The battery module also includes: a connecting piece; the electrode portions of the plurality of battery cells are electrically connected through the connecting piece.

5. The battery pack according to claim 4, characterized in that, The sampling circuit board includes multiple sampling components, which are connected to the connecting piece or the housing of the battery cell.

6. The battery pack according to claim 3, characterized in that, The busbar includes a first part and a second part, the first part being electrically connected to the second part, and the second part being electrically connected to the electrode part. The first part is fixed inside the first limiting groove.

7. The battery pack according to claim 6, characterized in that, The width of the first limiting groove is greater than the width of the first part.

8. The battery pack according to claim 7, characterized in that, The distance between the side edge of the first part and the side edge of the first limiting groove adjacent to it is 0.4mm-0.6mm.

9. The battery pack according to any one of claims 3-8, characterized in that, An explosion-proof valve is provided at the end of the battery cell facing the busbar, and the orthographic projection of the explosion-proof valve on the bracket does not overlap with the orthographic projection of the busbar on the bracket.

10. The battery pack according to any one of claims 6-8, characterized in that, The bracket is also provided with a second limiting groove, and the second part is fixed in the second limiting groove.

11. The battery pack according to claim 10, characterized in that, The width of the second limiting groove is greater than the width of the second part.

12. The battery pack according to claim 11, characterized in that, The distance between the side edge of the second part and the side edge of the adjacent second limiting groove is 0.4mm-0.6mm.

13. The battery pack according to any one of claims 1-8, characterized in that, A first insulating layer is provided on at least one side of the bus.

14. The battery pack according to claim 13, characterized in that, The first insulating layer is made of any one or more of epoxy resin, polyimide, or mica.

15. The battery pack according to any one of claims 1-8, characterized in that, The sampling circuit board is fixed on the side of the busbar that is away from the battery module.

16. The battery pack according to claim 15, characterized in that, The sampling circuit board is attached to the side of the busbar facing away from the battery module using adhesive.

17. The battery pack according to any one of claims 1-8, characterized in that, A second insulating layer is provided on at least one side of the sampling circuit board.

18. The battery pack according to claim 17, characterized in that, The second insulating layer is made of any one or more of epoxy resin, polyimide, or mica.

19. The battery pack according to claim 9, characterized in that, Also includes: The battery module, the bracket, the busbar, and the sampling circuit board are all located within the tray.

20. The battery pack according to claim 19, characterized in that, The tray includes: a bottom wall and a side wall connected to the bottom wall; The space between the sidewall and the busbar is filled with a thermally conductive material.

21. The battery pack according to claim 20, characterized in that, The thermally conductive material is thermally conductive adhesive.

22. The battery pack according to claim 20 or 21, characterized in that, The orthographic projection of the explosion-proof valve on the bracket does not overlap with the orthographic projection of the thermally conductive material on the bracket.

23. The battery pack according to claim 20 or 21, characterized in that, The orthographic projection of the busbar on the bracket lies within the orthographic projection of the thermally conductive material on the bracket.

24. The battery pack according to claim 20 or 21, characterized in that, Also includes: Protective cover; The protective cover is located between the sampling circuit board and the side wall, and the orthographic projection of the busbar on the side wall is located within the orthographic projection of the protective cover on the side wall.

25. The battery pack according to claim 20 or 21, characterized in that, A liquid cooling plate is provided on the side of the bottom wall facing the manifold.

26. An electrical appliance, characterized in that, At least including: The battery pack according to any one of claims 1-25.

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