Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, the battery pack has a first direction and a second direction which are intersected, and a box body is internally provided with a first mounting cavity and a second mounting cavity which are adjacently arranged along the first direction; the at least two battery packs are arranged in the first mounting cavity side by side in the second direction; the battery management system comprises a main control unit and at least two slave control units, the main control unit is arranged in the second mounting cavity, the single slave control unit is fixed on one side, facing the second mounting cavity, of the single battery pack, and the slave control units are in wireless communication connection with the main control unit. The master control unit and the slave control unit can keep a proper distance, so that disordered distribution in the battery pack is avoided, the space is effectively saved, signals can be transmitted to the master control unit from the slave control unit more efficiently, signal scattering and loss are reduced, and the accuracy and stability of signal transmission are improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] In recent years, with the popularization and development of electric vehicles, battery packs, as the main power source, have received increasing attention and research. Wireless BMS (Battery Management System) modules, as one of the core components of electric vehicles, typically include a main control board and slave control boards. The slave control board is responsible for collecting relevant data such as battery current, voltage, and temperature, and transmitting them to the main control board, which then performs functions such as battery system evaluation, thermal management, operation management, and charging management.

[0003] In related wireless BMS technologies, improper placement of the slave control unit and master control unit can lead to signal attenuation and poor reception, affecting the stability of the wireless BMS network and consequently impacting the performance of the wireless BMS module and the reliable operation of the battery pack. Utility Model Content

[0004] The main purpose of this utility model is to propose a battery pack and electrical equipment, which aims to solve the technical problem of poor network stability of existing battery packs.

[0005] To achieve the above objectives, this utility model proposes a battery pack having intersecting first and second directions, comprising:

[0006] The housing has a first mounting cavity and a second mounting cavity arranged adjacent to each other along the first direction.

[0007] At least two battery packs, wherein at least two battery packs are arranged side by side in the first mounting cavity along the second direction;

[0008] A battery management system includes a master control unit and at least two slave control units. The master control unit is located inside the second mounting cavity, and each slave control unit is fixed on the side of a single battery pack facing the second mounting cavity. The at least two slave control units are wirelessly connected to the master control unit.

[0009] In some embodiments, the housing includes a reinforcing beam disposed between the first mounting cavity and the second mounting cavity;

[0010] The battery pack also has a third direction intersecting the first direction and the second direction, and the height of the main control unit in the third direction is greater than the height of the reinforcing beam in the third direction.

[0011] In some embodiments, the battery pack further includes a bracket, one end of which is fixedly connected to the bottom wall of the second mounting cavity, and the other end of which is equipped with the main control unit. The height of the bracket in the third direction is greater than the height of the reinforcing beam in the third direction.

[0012] In some embodiments, the main control unit includes a main control housing and a main control circuit board. The main control housing has a first receiving cavity and a first opening communicating with the first receiving cavity. The main control circuit board is installed in the first receiving cavity.

[0013] In some embodiments, the main control unit further includes a first antenna, which is installed in the first receiving cavity and electrically connected to the main control circuit board. The first antenna is at least partially exposed in the first opening and is used for wireless communication connection with the slave control unit.

[0014] In some embodiments, the battery pack further includes an end plate disposed on one side of the battery pack, and the slave control unit is mounted on the side of the end plate facing away from the battery pack in the first direction.

[0015] In some embodiments, the slave control unit includes a slave control housing and a slave control circuit board, the slave control housing having a second receiving cavity and a second opening communicating with the second receiving cavity, and the slave control circuit board being installed in the second receiving cavity.

[0016] In some embodiments, the slave control unit further includes a second antenna, which is installed in the second receiving cavity and electrically connected to the slave control circuit board. The second antenna is at least partially exposed in the second opening for wireless connection with the master control unit.

[0017] In some embodiments, in the third direction, the distance from the bottom surface of the master control unit to the bottom wall of the second mounting cavity is greater than or equal to the distance from the bottom surface of the slave control unit to the bottom wall of the second mounting cavity.

[0018] This application also proposes an electrical device including the battery pack as described above.

[0019] The battery pack provided in this application arranges multiple slave control units on the side of the battery pack facing the second mounting cavity, with the master control unit and slave control units adjacent to each other and spaced apart. This allows the master control unit and slave control units to maintain a suitable distance, avoiding cluttered distribution within the battery pack and effectively saving space. Furthermore, since there are no other components obstructing the master control unit and slave control units, signals can be transmitted more efficiently from the slave control unit to the master control unit, reducing signal scattering and loss, and improving the accuracy and stability of signal transmission. This effectively avoids the space waste and mutual interference between components that occur in traditional layouts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery pack of this utility model;

[0021] Figure 2 for Figure 1 A disassembly diagram of the battery pack;

[0022] Figure 3 This is a disassembly diagram of an embodiment of the main control unit of this utility model;

[0023] Figure 4 This is a schematic diagram of the installation of the slave control unit and the battery pack of this utility model;

[0024] Figure 5 This is a disassembly diagram of an embodiment of the slave control unit of this utility model.

[0025] Explanation of icon numbers:

[0026] label name label name 100 battery pack 10 Box 11 First mounting cavity 12 Second mounting cavity 20 battery pack 30 Battery Management System 31 Main control unit 32 Slave control unit 40 support 311 Main control casing 312 Main control circuit board 313 First opening 314 First antenna 21 end plate 321 Slave housing 322 Slave control circuit board 323 Second opening 324 Second antenna 101 Divider 102 Strengthening beam X First direction Y Second direction Z Third direction

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The solutions in 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 a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0031] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0032] Please refer to Figure 1 and Figure 2 One embodiment of this application proposes a battery pack 100 having an intersecting first direction X and a second direction Y, including a housing 10, at least two battery packs 20 and a battery management system 30, wherein a first mounting cavity 11 and a second mounting cavity 12 are provided adjacently along the first direction X inside the housing 10.

[0033] At least two battery packs 20 are arranged side by side along the second direction Y in the first mounting cavity 11;

[0034] The battery management system 30 includes a master control unit 31 and at least two slave control units 32. The master control unit 31 is located in the second mounting cavity 12. Each slave control unit 32 is fixed on the side of a single battery pack 20 facing the second mounting cavity 12. The at least two slave control units 32 are wirelessly connected to the master control unit 31.

[0035] In this embodiment, by setting different component areas along the intersecting first direction X and second direction Y within the housing 10, a reasonable division of space and effective integration of functions are achieved. Specifically, the first direction X determines the arrangement order of the first mounting cavity 11 and the second mounting cavity 12, while the second direction Y determines the arrangement of the battery pack 20 within the first mounting cavity 11. This allows the battery pack 20 to be arranged compactly and orderly, fully utilizing the internal space of the battery pack 100 and improving the overall energy density of the battery pack 100.

[0036] In this embodiment, the slave control unit 32 is electrically connected to the corresponding battery pack 20 and can collect various parameters of the battery pack 20 in real time, such as voltage, current, and temperature. Since each slave control unit 32 is fixed on the side of a single battery pack 20 facing the second mounting cavity 12, this compact layout makes data acquisition more direct and accurate. The master control unit 31 is located in the second mounting cavity 12 and spaced apart from the battery pack 20, avoiding interference from the battery pack 20 during operation due to excessive proximity. It also maintains a relatively reasonable distance from the slave control unit 32 to receive data sent by the slave control unit 32 via wireless connection, thereby monitoring and managing the status of the entire battery pack 100.

[0037] Furthermore, at least two slave control units 32 are wirelessly connected to the master control unit 31. Through a wireless communication protocol, the slave control units 32 can send the collected information from the battery pack 20 to the master control unit 31, reducing the risk of signal transmission failures caused by issues such as aging wiring or short circuits. Simultaneously, the reasonable spacing between the master control unit 31 and the slave control units 32, along with the absence of other obstructing components, ensures stable and efficient wireless signal transmission, reducing signal attenuation, scattering, and interference. This improves the accuracy and timeliness of data transmission, ensuring that the battery management system 30 can quickly and accurately respond to changes in the state of the battery pack 20, guaranteeing the safe and reliable operation of the battery pack 100, and effectively extending the battery's lifespan.

[0038] The battery pack 100 provided in this application arranges multiple slave control units 32 on the side of the battery pack 20 facing the second mounting cavity 12, and the master control unit 31 and slave control units 32 are spaced apart, so that the master control unit 31 and slave control units 32 can maintain a suitable distance, avoiding messy distribution in the battery pack 100, effectively saving space. Moreover, there are no other components blocking the master control unit 31 and slave control units 32, so the signal can be transmitted from the slave control unit 32 to the master control unit 31 more efficiently, reducing signal scattering and loss, improving the accuracy and stability of signal transmission, and effectively avoiding the problems of space waste and mutual interference between components in traditional layouts.

[0039] In some embodiments, the housing 10 includes a reinforcing beam 102, which is disposed between the first mounting cavity 11 and the second mounting cavity 12;

[0040] The battery pack 100 also has a third direction Y that intersects with the first direction X and the second direction Z. The height of the main control unit 31 in the third direction Y is greater than the height of the reinforcing beam 102 in the third direction Y.

[0041] In this embodiment, the reinforcing beam 102 can physically separate the first mounting cavity 11 and the second mounting cavity 12. During assembly, this allows the operator to clearly distinguish the mounting area of ​​the battery pack 20 and the mounting area of ​​the main control unit 31 of the battery management system 30, avoiding confusion and errors in component installation.

[0042] In addition, the presence of the reinforcing beam 102 significantly enhances the rigidity of the battery pack 100 housing 10. In real-world applications, such as the battery pack 100 of an electric vehicle, the vehicle experiences various road conditions during operation, including bumpy roads, sudden braking, and sharp turns. The reinforcing beam 102 effectively resists the external forces generated under these conditions, reducing deformation and torsion of the housing, protecting the battery pack 20 and battery management system 30 from damage, thereby improving the reliability and safety of the battery pack 100.

[0043] In this embodiment, the main control unit 31 is positioned above the reinforcing beam 102, which provides it with a relatively independent and flat installation space, enabling it to better communicate wirelessly with other components (such as the slave control unit 32), and also facilitating the layout and maintenance of the wiring.

[0044] In some embodiments, the first mounting cavity 11 is provided with a plurality of partition strips 101 along the second direction Y, which can further position and fix the battery packs 20 arranged side by side along the second direction Y, prevent the battery packs 20 from shifting due to vehicle vibration, acceleration or deceleration during daily use, ensure that the battery packs 20 always maintain a stable arrangement, thereby maintaining the overall structural stability of the battery pack 100, and ensuring the reliability of the connection between the battery packs 20 and the stability of the electrical performance.

[0045] In this embodiment, the reinforcing beam 102 and the partition strip 101 together constitute multiple precise positioning intervals. Specifically, the partition strip 101 can quickly guide the battery pack 20 to the predetermined position, ensuring that each battery pack 20 can be arranged accurately, avoiding the tedious operation of repeated adjustments due to positional deviations during assembly; the reinforcing beam 102 is located between the first mounting cavity 11 and the second mounting cavity 12, clearly dividing the two functional areas and avoiding confusion and errors in component installation.

[0046] Please continue to refer to this. Figure 2 In some embodiments, the battery pack 100 further includes a bracket 40, one end of which is fixedly connected to the bottom wall of the second mounting cavity 12, and the other end of which is equipped with a main control unit 31. The height of the bracket 40 in the third direction Y is greater than the height of the reinforcing beam 102 in the third direction Y.

[0047] In this embodiment, one end of the bracket 40 is firmly fixed to the bottom wall of the second mounting cavity 12, and its position is ensured by a reliable connection method, such as welding or bolt fixing. The other end of the bracket 40 is responsible for installing the main control unit 31, providing a specific and suitable installation position for the main control unit 31 of the battery management system 30.

[0048] On the one hand, mounting the main control unit 31 on the bracket 40 can keep it at a certain distance from the bottom wall of the second mounting cavity 12, avoiding the adverse environmental factors such as water accumulation and dust buildup that may be encountered due to direct contact with the bottom wall of the cavity. This helps to protect the main control unit 31, maintain its good working condition, and extend its service life.

[0049] On the other hand, fixing the main control unit 31 with the bracket 40 allows the main control unit 31 to be in a relatively independent and reasonably arranged position within the second mounting cavity 12, and to be higher than the reinforcing beam 102. This avoids the wireless signal transmission being affected by the reinforcing beam 102, thus facilitating the transmission and interaction of wireless signals with each slave control unit 32. The bracket 40 can be adjusted as needed to change the height, angle, and other parameters of the main control unit 31, further optimizing the signal transmission path and reducing the possibility of signal obstruction or interference. This enhances the accuracy and stability of the entire battery management system 30 in monitoring and managing the battery pack 20, ensuring the safe and efficient operation of the battery pack 100.

[0050] Furthermore, when performing maintenance, repair, or replacement of the main control unit 31 on the battery pack 100, the presence of the bracket 40 makes the main control unit 31 easier to access and operate. Maintenance personnel can easily disassemble, inspect, and reinstall it, effectively reducing maintenance costs and difficulty and improving the maintainability of the entire battery pack 100.

[0051] Please refer to Figure 3 In some embodiments, the main control unit 31 includes a main control housing 311 and a main control circuit board 312. The main control housing 311 has a first receiving cavity and a first opening 313 communicating with the first receiving cavity. The main control circuit board 312 is installed in the first receiving cavity.

[0052] In this embodiment, the main control unit 31, as a key component of the battery management system 30, consists of two parts: the main control housing 311 and the main control circuit board 312. The main control housing 311 plays a crucial protective role. Mounted on the bracket 40, it not only protects the internal main control circuit board 312 from damage through its physical structure and resists the intrusion of dust, moisture, and other impurities from the outside, but also provides electromagnetic shielding to a certain extent, reducing the impact of external electromagnetic interference on the precision electronic components and circuits on the main control circuit board 312, and ensuring that the main control circuit board 312 can operate stably and reliably.

[0053] The first cavity provides a relatively enclosed and stable installation environment for the main control circuit board 312. The main control circuit board 312 is protected from external physical impacts and most environmental factors such as dust and moisture, ensuring the normal operation of its electronic components and the stability of the circuit. This reduces the risk of failure caused by external environmental factors, thereby guaranteeing the reliability and stability of the battery management system 30. Meanwhile, the first opening 313 reduces physical obstructions during wireless signal transmission and optimizes the signal transmission path.

[0054] In some embodiments, the distance between the master control unit 31 and the slave control unit 32 is greater than 0m and less than 10m, for example, the distance between them can be 3m, 5m, or 9m. On the one hand, this can avoid mutual interference that may occur due to excessive distance. On the other hand, it can avoid problems such as poor signal reception, data loss, or transmission delay caused by excessive distance, which would affect the real-time acquisition and accurate judgment of the battery pack 20 status information by the battery management system 30, and would be detrimental to the effective management and safe operation of the entire battery pack 100.

[0055] In this embodiment, the master control unit 31 and the slave control unit 32 maintain a reasonable distance, allowing the wireless signal to be transmitted with high quality. This ensures that the data collected by the slave control unit 32 can be received by the master control unit 31 in a timely and accurate manner, enabling the battery management system 30 to quickly respond to various changes in the battery pack 20 and maintain the battery pack 100 in a good working condition. Please continue to refer to... Figure 3 In some embodiments, the main control unit 31 further includes a first antenna 314, which is installed in the first receiving cavity and electrically connected to the main control circuit board 312. The first antenna 314 is at least partially exposed in the first opening 313 for wireless communication connection with the slave control unit 32.

[0056] In this embodiment, the setting of the first opening 313 is one of the key factors for realizing wireless communication between the master control unit 31 and the slave control unit 32. By allowing the first antenna 314 to be at least partially exposed in the opening, the physical obstruction in the wireless signal transmission process is reduced, the signal transmission path is optimized, and the wireless signal emitted by the slave control unit 32 can be received by the first antenna 314 more directly and efficiently. At the same time, it is also beneficial for the signal sent by the master control unit 31 to the slave control unit 32 through the first antenna 314 to be propagated more smoothly, thereby improving the wireless communication quality and response speed of the entire battery management system 30, and ensuring that the operating status of the battery pack 100 can be monitored and controlled in a timely and accurate manner.

[0057] Please refer to Figure 4 In some embodiments, the battery pack 100 further includes an end plate 21, which is disposed on one side of the battery pack 20, and the slave control unit 32 is mounted on the side of the end plate 21 facing away from the battery pack 20 in the first direction X.

[0058] In this embodiment, the slave control unit 32 obtains a stable and suitable installation position by connecting to the end plate 21. The end plate 21 itself has a relatively fixed structure, providing reliable support for the slave control unit 32 and preventing the slave control unit 32 from becoming loose or changing position due to vehicle vibration or slight displacement of the battery pack 20 itself during the operation of the battery pack 100. This ensures that the slave control unit 32 can always stably perform its monitoring function of the battery pack 20.

[0059] Furthermore, the slave control unit 32 is connected to the end plate 21, making it easier to obtain relevant information about the battery pack 20 nearby. Since the end plate 21 is closely connected to the battery pack 20, the slave control unit 32 can more directly and accurately collect various key parameters of the battery pack 20, such as real-time voltage values ​​and temperature changes, through the corresponding connection lines. Then, it accurately transmits this data to the master control unit 31, enabling the master control unit 31 to perform a comprehensive status assessment, fault diagnosis, and corresponding control management of the battery pack 20 based on this information, ensuring that the battery pack 100 is always in a safe and efficient operating state.

[0060] Please refer to Figure 5 In some embodiments, the slave control unit 32 includes a slave control housing 321 and a slave control circuit board 322. The slave control housing 321 has a second receiving cavity and a second opening 323 communicating with the second receiving cavity. The slave control circuit board 322 is installed in the second receiving cavity.

[0061] In this embodiment, the second accommodating cavity provides a relatively enclosed and stable installation environment for the slave control circuit board 322. The slave control circuit board 322 is protected from external physical impacts and most environmental factors such as dust and moisture, ensuring the normal operation of its electronic components and the stability of the circuit, reducing the risk of failure caused by external environmental factors, thereby guaranteeing the reliability and stability of the battery management system 30. The second opening 323 reduces physical obstructions during wireless signal transmission and optimizes the signal transmission path.

[0062] Furthermore, the distance between the slave control circuit board 322 and the surface of the end plate 21 is greater than 10mm. This can prevent the slave control circuit board 322 from being too close to the end plate 21 and being excessively affected by heat transfer (the battery pack 20 generates heat when it is working, and the end plate 21 may conduct some of the heat). This also prevents the electronic components on the slave control circuit board 322 from experiencing performance degradation, shortened lifespan, or even failure due to prolonged exposure to high temperatures. This helps maintain the normal operating temperature range of the slave control circuit board 322 and ensures its stable operation.

[0063] Please continue to refer to this. Figure 5 In some embodiments, the slave control unit 32 further includes a second antenna 324, which is installed in the second receiving cavity and electrically connected to the slave control circuit board 322. The second antenna 324 is at least partially exposed in the second opening 323 for wireless connection with the master control unit 31.

[0064] In this embodiment, the setting of the second opening 323 is one of the key factors for realizing wireless communication between the master control unit 31 and the slave control unit 32. By allowing the second antenna 324 to be at least partially exposed in the opening, the physical obstruction in the wireless signal transmission process is reduced, the signal transmission path is optimized, and the wireless signal emitted by the master control unit 31 can be received by the second antenna 324 more directly and efficiently. At the same time, it is also beneficial for the signal sent by the slave control unit 32 to the slave control unit 32 through the second antenna 324 to be propagated more smoothly. This improves the wireless communication quality and response speed of the entire battery management system 30, and ensures that the operating status of the battery pack 100 can be monitored and controlled in a timely and accurate manner.

[0065] For example, the first antenna 314 and the second antenna 324 can be printed antennas or microstrip antennas, etc. For instance, the first antenna 314 is a printed antenna formed by directly printing conductive materials (such as copper, silver, etc.) onto the dielectric substrate of the main control circuit board 312 using printing technology (such as screen printing, inkjet printing, etc.). Of course, this is only an example and is not limited herein.

[0066] In some embodiments, the second opening 323 is disposed toward the second mounting cavity 12.

[0067] In this embodiment, the orientation of the second opening 323 toward the second mounting cavity 12 allows the signal to propagate more directly toward the target area, reducing bends and reflections during signal propagation, thereby improving the efficiency and accuracy of signal transmission. Especially for weak electrical signals that rely on wireless communication or require precise transmission, this opening orientation helps ensure that signals interact between different components along the optimal path, making communication between different parts of the battery management system 30 smoother. For example, when transmitting data such as battery pack 20 status information between the slave control unit 32 and the master control unit 31, signal loss and interference can be reduced, better maintaining the coordinated operation of the entire system.

[0068] In some embodiments, in the third direction Y, the distance from the bottom surface of the main control unit 31 to the bottom wall of the second mounting cavity 12 is greater than or equal to the distance from the bottom surface of the secondary control unit 32 to the bottom wall of the second mounting cavity 12.

[0069] In this embodiment, the master control unit 31 is located above the slave control unit 32, with the shortest distance between them. According to the basic principle of wireless signal propagation, the degree of signal attenuation during transmission is closely related to the propagation distance. The shorter the distance, the stronger the signal when it reaches the receiving end. Therefore, the slave control unit 32 can receive a relatively stronger signal from the master control unit 31, and the master control unit 31 can also better receive the information fed back by the slave control unit 32, thus possessing better anti-interference capabilities. It can effectively resist various electromagnetic interferences from other components inside the battery pack 100 (such as the electromagnetic field generated by the charging and discharging of the battery pack 20, electromagnetic noise generated by other lines, etc.) and from the external environment, ensuring the stability and reliability of signal transmission.

[0070] This application also provides an electrical device, including the battery pack 100 as described above. Specifically, the electrical device can be a new energy vehicle, a storage device, a computer, a mobile phone, or other electrical equipment. This electrical device can possess all the technical features and corresponding beneficial effects of the battery pack 100 described above, which will not be repeated here.

[0071] The above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all possible implementations here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, Having intersecting first and second directions, including: The housing has a first mounting cavity and a second mounting cavity arranged adjacent to each other along the first direction. At least two battery packs, wherein at least two battery packs are arranged side by side in the first mounting cavity along the second direction; A battery management system includes a master control unit and at least two slave control units. The master control unit is located inside the second mounting cavity, and each slave control unit is fixed on the side of a single battery pack facing the second mounting cavity. The at least two slave control units are wirelessly connected to the master control unit.

2. The battery pack according to claim 1, characterized in that, The housing includes a reinforcing beam, which is disposed between the first mounting cavity and the second mounting cavity; The battery pack also has a third direction intersecting the first direction and the second direction, and the height of the main control unit in the third direction is greater than the height of the reinforcing beam in the third direction.

3. The battery pack according to claim 2, characterized in that, The battery pack also includes a bracket, one end of which is fixedly connected to the bottom wall of the second mounting cavity, and the other end of which is equipped with the main control unit. The height of the bracket in the third direction is greater than the height of the reinforcing beam in the third direction.

4. The battery pack according to claim 1, characterized in that, The main control unit includes a main control housing and a main control circuit board. The main control housing has a first receiving cavity and a first opening communicating with the first receiving cavity. The main control circuit board is installed in the first receiving cavity.

5. The battery pack according to claim 4, characterized in that, The main control unit further includes a first antenna, which is installed in the first accommodating cavity and electrically connected to the main control circuit board. The first antenna is at least partially exposed in the first opening and is used for wireless communication connection with the slave control unit.

6. The battery pack according to claim 1, characterized in that, The battery pack also includes an end plate, which is disposed on one side of the battery pack, and the slave control unit is installed on the side of the end plate facing away from the battery pack in the first direction.

7. The battery pack according to claim 1, characterized in that, The slave control unit includes a slave control housing and a slave control circuit board. The slave control housing has a second receiving cavity and a second opening communicating with the second receiving cavity. The slave control circuit board is installed in the second receiving cavity.

8. The battery pack according to claim 7, characterized in that, The slave control unit further includes a second antenna, which is installed in the second receiving cavity and electrically connected to the slave control circuit board. The second antenna is at least partially exposed in the second opening for wireless connection with the master control unit.

9. The battery pack according to claim 2, characterized in that, In the third direction, the distance from the bottom surface of the main control unit to the bottom wall of the second mounting cavity is greater than or equal to the distance from the bottom surface of the slave control unit to the bottom wall of the second mounting cavity.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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