Battery pack and electric device

Abstract

A battery pack (1000) and an electric device (2000). The battery pack (1000) comprises: a battery management system (10); a plurality of battery modules (20); a circuit board (30); and a connector assembly (40), wherein the plurality of circuit boards (30) are sequentially connected in series to form a circuit board string, and the circuit board string is connected to the battery management system (10) so as to transmit working condition data of battery cells (22) in the battery modules (20) to the battery management system (10).

Description

Battery pack and electrical equipment

[0001] Priority information

[0002] This application claims priority and benefits of patent application number 202311649170.8 filed with the State Intellectual Property Office of China on December 1, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Art

[0004] In related technologies, parameters such as the voltage and temperature of the battery pack are usually transmitted to the Battery Management System (BMS) through wiring collection. Specifically, one end of the wiring is connected to the BMS interface, and the other end collects the voltage and temperature of the battery module. However, with the current trend of pursuing high energy density in battery packs, the number of modules in the battery pack is constantly increasing, resulting in a continuous increase in the volume of the battery pack. The problem with the above-mentioned wiring harness wiring collection method is that not only are the wiring diameters of some modules relatively large, which causes the wiring to occupy too much of the internal space of the battery pack, resulting in low internal space utilization of the battery pack and increased manufacturing costs of the battery pack, but the number of wiring arrangements is also large, the wiring harness is complex, and electrical safety is poor.

[0005] Summary of the Invention

[0006] The present application discloses a battery pack and an electrical device to solve the problem in the related art that wiring collection leads to low internal space utilization of the battery pack and poor safety.

[0007] To solve the above problems, in the first aspect, the present application discloses a battery pack, comprising: a battery management system; a plurality of battery modules, in which a plurality of battery cells are arranged in sequence along the length direction of each battery module; a circuit board, a circuit board is provided on the top of each battery module, and the circuit board connects the battery cells in the battery module to collect the operating condition data of each battery cell; a connector assembly, comprising a first interface and a first plug connected to each other, one of two adjacent circuit boards is provided with the first interface, and the other is provided with the first plug; the two adjacent circuit boards are connected to each other through the connector assembly, so that the multiple circuit boards are connected in series in sequence to form a circuit board string; the circuit board string is connected to the battery management system to transmit the operating condition data of each battery cell in each battery module to the battery management system.

[0008] In a second aspect, the present application discloses an electrical device including a battery pack.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] In this application, the operating data of each battery cell in the corresponding battery module is first collected through the circuit board. Then, the operating data such as voltage data and temperature data of each battery cell in each battery module are summarized through the circuit board and transmitted to the battery management system. This method of collecting data through the circuit board is more space-saving than the wiring harness layout method, and the cost is lower than the wiring harness. The connection and fixation are more reliable and the space occupied is smaller, which is conducive to improving the space utilization inside the battery. At the same time, compared with the complicated wiring harness layout, it can improve the safety of electricity use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] FIG1 is a plan view of the battery pack disclosed in this application;

[0013] FIG2 is an enlarged view of point I in FIG1 of the present application;

[0014] FIG3 is an enlarged view of point II in FIG1 of the present application;

[0015] FIG4 is a structural diagram of a battery module disclosed in this application;

[0016] FIG5 is an enlarged view of point III of FIG4 of the present application;

[0017] FIG6 is an enlarged view of point IV of FIG4 of the present application;

[0018] FIG7 is an enlarged view of point V in FIG4 of the present application;

[0019] FIG8 is a structural diagram of the end plate disclosed in this application;

[0020] FIG9 is a structural diagram of the electrical equipment disclosed in this application.

[0021] Description of reference numerals:

[0022] 1000-battery pack, 10-battery management system, 20-battery module, 20a-first battery module, 20b-second battery module, 21-end plate, 211-first circuit board fixing seat, 212-second circuit board fixing seat, 22-battery cell, 23-connector, 24-tie, 25-locating pin, 30-circuit board, 301-collection component, 302-reinforcement plate, 30a-first circuit board, 31-first rigid connection part, 311 -Adapter, 3111-second interface, 3112-second plug, 32-second rigid connection part, 33-flexible connection part, 30b-second circuit board, 35-flexible bending part, 36-avoidance hole, 40-connector assembly, 41-first interface, 42-first plug, 50-wire, 60-circuit board support, 61-support part, 62-wing plate part, 621-limiting bar, 63-limiting part, 70-cover, 2000-electrical equipment. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0025] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0026] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0027] Furthermore, the terms "second," "first," and the like are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0028] In the related art, the voltage, temperature and other parameters of the battery pack are usually transmitted to the Battery Management System (BMS) through wiring collection. However, the voltage and temperature collection end of the battery module is often far away from the BMS interface end, which requires the wiring to have sufficient length. This causes the wiring to occupy too much internal space of the battery pack, resulting in low utilization of the internal space of the battery pack. In addition, the number of wiring arrangements is large, the wiring harness is complicated and the electrical safety is poor. For this reason, the technical solution of this application was produced, which is explained below in conjunction with Figures 1 to 9.

[0029] Referring to Figures 1, 4, and 5, this application discloses a battery pack comprising a battery management system 10, multiple battery modules 20, a circuit board 30, and a connector assembly 40. The battery management system (BMS), also known as the "brain" of the battery operating system, transmits and receives information from the battery and each external port, and after in-depth analysis and processing of the information, issues execution commands.

[0030] As shown in Figures 4 and 5 , battery modules 20 are the energy storage components of a battery pack. Each battery module 20 is arranged with multiple battery cells 22 arranged in sequence along its length. End plates 21 are provided at both ends of the battery module 20, with the multiple battery cells 22 positioned between the end plates 21. A connector 23 is provided at the top of the battery module 20, near the circuit board 30. The connector 23 electrically connects to the positive electrode of one of two adjacent battery cells 22 and the negative electrode of the other, allowing the multiple battery cells 22 to be connected in series, thus ensuring the proper operation of the battery module 20. The battery module 20 is also equipped with a cable tie 24. The cable tie 24 is positioned around the end plates 21 and the multiple battery cells 22 to secure the multiple battery cells 22 together, ensuring structural stability of the resulting battery module 20. Multiple battery modules 20 can be arranged in a battery pack, and these modules can be arranged in sequence to form a module string, which can extend along the length of the battery pack.

[0031] Multiple circuit boards 30 can be provided, and the multiple circuit boards 30 correspond one-to-one to the multiple battery modules 20. A circuit board 30 is provided on the top of each battery module 20. The circuit board 30 connects to each battery cell 22 in the battery module 20 to collect operating data of each battery cell 22. Specifically, connectors 23 shown in Figure 5 are provided on both sides of the top of the battery module 20. The circuit board 30 is provided in the middle position of the top of the battery module 20. The connectors 23 are provided on both sides of the width direction of the circuit board 30 and are arranged at intervals along the length direction of the circuit board 30. A collection component 301 is electrically connected between the circuit board 30 and the connector 23. The collection component 301 is connected to the connector 23 in a one-to-one correspondence. The circuit board 30 collects operating data of each battery cell 22 through the collection component 301. The operating data may include at least one of voltage data, current data, and temperature data.

[0032] As shown in Figure 6, the connector assembly 40 includes a first interface 41 and a first plug 42. One of two adjacent circuit boards 30 is provided with the first interface 41, and the other is provided with the first plug 42. The two adjacent circuit boards 30 are interconnected via the connector assembly 40, so that multiple circuit boards 30 are sequentially connected in series to form a circuit board string.

[0033] The circuit board is connected in series with the battery management system 10 to transmit operating data such as voltage, current, and temperature data of each battery cell 22 in each battery module 20 to the battery management system 10. This collection method using the circuit board 30 is more space-saving and less expensive than a wiring harness layout. The connection is more reliable and occupies less space, which helps improve space utilization within the battery. It also improves power safety compared to a complex wiring harness layout.

[0034] Optionally, as shown in Figures 4 and 7 , a circuit board 30 for connecting to the battery management system 10 is provided with a first rigid connection portion 31 at one end thereof facing the battery management system 10. The first rigid connection portion 31 includes an adapter 311, and the adapter 311 is connected to the battery management system 10 via a wire 50. The provision of the first rigid connection portion 31 can enhance the rigidity of the end portion of the circuit board 30, thereby providing the end portion of the circuit board 30 with greater structural stability, thereby ensuring that the circuit board 30 itself is not easily deformed.

[0035] Optionally, as shown in Figures 1 and 3, the adapter 311 includes a second interface 3111 and a second plug 3112 that are connected to each other, and one of the second interface 3111 and the second plug 3112 is provided on the wire 50. In this way, the detachable design between the wire 50 and the adapter 311 facilitates the connection and disconnection of the wire 50 and the first rigid connection part 31.

[0036] Optionally, as shown in Figures 4 and 7, the end plate 21 on the battery module 20 close to the battery management system 10, which is arranged corresponding to the circuit board 30 provided with the first rigid connecting part 31, is provided with a first circuit board fixing seat 211 connected to the first rigid connecting part 31. The first circuit board fixing seat 211 can be connected to the end plate 21 by means of a pin or the like, and the first rigid connecting part 31 can be connected to the first circuit board fixing seat 211 by means of bolts or the like, thereby further ensuring the connection stability of the circuit board 30.

[0037] Optionally, as shown in Figures 4, 6, and 7, a second rigid connection portion 32 is provided at one end of the circuit board 30 facing another adjacent circuit board 30, and the second rigid connection portion 32 is connected to the other adjacent circuit board 30 via a connector assembly 40. The provision of the second rigid connection portion 32 can also enhance the rigidity of the end portion of the circuit board 30, thereby providing the end portion of the circuit board 30 with better structural stability.

[0038] Optionally, as shown in Figure 6, one of the end plates 21 on the battery module 20 that is arranged corresponding to the circuit board 30 provided with the second rigid connecting part 32 and is away from the battery management system 10 is provided with a second circuit board fixing seat 212 connected to the second rigid connecting part 32 on the top. The structure of the second circuit board fixing seat 212 can be the same as or different from the structure of the first circuit board fixing seat 211. The second circuit board fixing seat 212 can also be connected to the end plate 21 by means of a latch or the like, and the second rigid connecting part 32 can be connected to the second circuit board fixing seat 212 by means of bolts or the like, thereby further ensuring the connection stability of the circuit board 30.

[0039] More specifically, the battery module 20 close to the battery management system 10 is the first battery module 20a, the circuit board 30 set on the first battery module 20a is the first circuit board 30a, the middle part of the first circuit board 30a is a flexible connection part 33, and the two ends are respectively a first rigid connection part 31 and a second rigid connection part 32 connected to the flexible connection part 33, wherein the flexible connection part 33 is connected to each battery cell 22 of the first battery module 20a, so that the first circuit board 30a can maintain the rigidity of the two end positions while ensuring flexibility, thereby ensuring the connection stability with the adjacent circuit boards 30 and wires 50.

[0040] One of the end plates 21 at both ends of the first battery module 20a is provided with a first circuit board fixing seat 211 to connect to the first rigid connection portion 31, and the other is provided with a second circuit board fixing seat 212 to connect to the second rigid connection portion 32, thereby ensuring connection stability.

[0041] Optionally, a flexible bend portion 35 is provided at one end of the circuit board 30 facing the other adjacent circuit board 30. The flexible bend portion 35 is suspended above the installation gap reserved between the two adjacent battery modules 20, and the flexible bend portion 35 is connected to the other adjacent circuit board 30 via the connector assembly 40. The provision of the flexible bend portion 35 provides the circuit board 30 with a flexible deformable portion. The flexible bend portion 35 can adjust its position and shape to adapt to changes in the position or distance between the two adjacent battery modules 20, thereby facilitating the connection between the two adjacent battery modules 20. At the same time, the circuit board 30 can reserve a redundant portion through the flexible bend portion 35 to prevent external abnormalities such as battery pack shaking from causing the two interconnected circuit boards 30 to pull on each other and cause the connection to fail.

[0042] Alternatively, as shown in Figures 4 and 6 , one of the end plates 21 of the battery module 20, which is arranged corresponding to the circuit board 30 having the flexible bending portion 35, is spaced apart from the flexible bending portion 35 along the height direction of the battery module 20. This prevents the end plate 21 from squeezing or interfering with the flexible bending portion 35 and leaves sufficient space for the flexible bending portion 35 to fully deform and adapt to changes in the position or distance between two adjacent battery modules 20.

[0043] More specifically, the battery module 20 is divided into a first battery module 20a and a second battery module 20b arranged in sequence along the length direction of the battery pack, and the circuit board 30 is divided into a first circuit board 30a arranged on the top of the first battery module 20a, and a second circuit board 30b arranged on the second battery module 20b. The second circuit board 30b includes a flexible connection part 33 and a flexible bending part 35 connected to each other. The flexible connection part 33 of the second circuit board 30b is connected to each battery cell 22 of the second battery module 20b, and the second circuit board 30b is connected to the first circuit board 30a through the flexible bending part 35 and the connector assembly 40.

[0044] Furthermore, as mentioned above, the battery pack in the present application can form a module string with only two battery modules 20, that is, the above-mentioned first battery module 20a and the second battery module 20b are arranged in sequence to form a module string. The battery pack can set multiple module strings side by side to ensure the capacity of the battery pack. Among them, a first circuit board 30a is set on the top of the first battery module 20a. The first circuit board 30a can ensure good connection stability with the first battery module 20a, the wire 50, and the second circuit board 30b by strengthening the rigidity at both ends. The second circuit board 30b is set on the top of the second battery module 20b. The flexibility of the second circuit board 30b is adjustable through the flexible bending part 35 to ensure the effectiveness of the connection between the second circuit board 30b and the first circuit board 30a, and the redundant part reserved by the flexible bending part 35 is used to prevent the second circuit board 30b and the first circuit board 30a from pulling each other and causing connection failure.

[0045] Optionally, the module string may also include three or more battery modules 20, such as multiple first battery modules 20a and one second battery module 20b, or one first battery module 20a and multiple second battery modules 20b, etc., which will not be described in detail here.

[0046] Optionally, as shown in Figures 4 to 6 , the battery pack also includes multiple circuit board supports 60 , one of which is positioned atop each battery module 20 . The circuit board supports 60 include a supporting portion 61 and a wing portion 62 that are interconnected. The supporting portion 61 is positioned between the circuit board 30 and the battery module 20 , while the wing portion 62 is offset from the circuit board 30 . The supporting portion 61 provides structural support for the circuit board 30 , keeping it stable and preventing deformation.

[0047] Optionally, as shown in Figures 4 to 6, the support portion 61 is arranged between the flexible connection portion 33 of the circuit board 30 and the battery module 20, and a limiting bar 621 is provided on the side of the wing portion 62 close to the flexible bending portion 35 of the circuit board 30. The limiting bar 621 extends toward the circuit board 30 to limit the circuit board 30 along the width direction of the battery pack. More specifically, for the second circuit board 30b, the wing portion 62 can pre-position the flexible bending portion 35 through the limiting bar 621, so as to facilitate its rapid connection to the first circuit board 30a.

[0048] Optionally, the wing portion 62 is away from the edge of the support portion 61 and is provided with a limiting portion 63 extending from the top of the battery module 20 to the bottom of the battery module 20. The limiting portion 63 can limit the battery cell 22 in the battery module 20 along the width direction of the battery pack. The limiting portion 63 can cooperate with the cable tie 24 to make the position of the battery cell 22 more fixed, preventing the battery cell 22 from shaking abnormally and moving out of its original position, thereby ensuring the overall structural stability of the battery module 20.

[0049] Optionally, as shown in Figure 5, a positioning pin 25 can be provided on the top of the battery module 20, and a positioning hole can be provided on the circuit board 30. The positioning hole is positioned to fit over the positioning pin 25. This prevents the circuit board 30 from sliding abnormally, particularly preventing it from moving along the length of the battery pack. Furthermore, multiple positioning pins 25 can be provided along the length of the battery pack, and multiple positioning holes can be provided on the circuit board 30, with each of the multiple positioning holes corresponding to the multiple positioning pins 25, to improve positioning effectiveness.

[0050] Optionally, as shown in Figure 5, the circuit board 30 is provided with a plurality of avoidance holes 36, and the plurality of avoidance holes 36 correspond one-to-one to the plurality of explosion-proof valves provided on the plurality of battery cells 22 in the battery module 20, so as to reserve the pressure relief space required by the explosion-proof valve when the battery cells 22 need to relieve pressure.

[0051] Optionally, the circuit board 30 is a flexible circuit board. The overall material of the flexible circuit board is soft and easy to lay, and the wire diameter is small, which can save layout space.

[0052] Optionally, multiple battery modules 20 and multiple circuit boards 30 are arranged in an array, and multiple circuit boards 30 in the same column are connected in series in sequence to form a circuit board string. Multiple circuit board strings are arranged side by side and spaced apart along the width direction of the battery pack, and the battery management system 10 connects multiple circuit board strings in parallel. In this way, the battery pack can store more energy while also realizing effective collection of operating condition data such as voltage data, current data and temperature data.

[0053] Optionally, the battery pack may further include a cover 70 , in which the battery management system 10 , the battery module 20 and the circuit board 30 are all disposed. The cover 70 provides an installation base and shielding protection for relevant components of the battery pack.

[0054] This application also discloses an electric device including the aforementioned battery pack 1000. The electric device may be a battery-powered vehicle, an electric toy, an electric tool, an electric vehicle, a ship or spacecraft, a mobile phone, a portable device, a PDA, a laptop computer, etc. For example, the electric device 2000 is a vehicle as shown in FIG. 9 . The battery pack 1000 may be installed in the vehicle to power the vehicle, and will not be described in detail here.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, wherein: include: Battery management system (10); A plurality of battery modules (20), each of the battery modules (20) being provided with a plurality of battery cells (22) in sequence along its length direction; A circuit board (30), wherein the top of each battery module (20) is provided with a circuit board (30), and the circuit board (30) is connected to each battery cell (22) in the battery module (20) to collect operating data of each battery cell (22); A connector assembly (40) comprising a first interface (41) and a first plug (42) connected to each other, one of the two adjacent circuit boards (30) being provided with the first interface (41) and the other being provided with the first plug (42); the two adjacent circuit boards (30) being connected to each other via the connector assembly (40) so that a plurality of circuit boards (30) are sequentially connected in series to form a circuit board string; The circuit board is connected in series to the battery management system (10) to transmit the operating condition data of each battery cell (22) in each battery module (20) to the battery management system (10).

2. The battery pack according to claim 1, wherein: The battery module (20) is provided with a connector (23) near the top of the circuit board, and the connector (23) is electrically connected to the positive electrode of one of two adjacent battery cells (22) and the negative electrode of the other, so that the plurality of battery cells (22) are sequentially connected in series; The circuit board (30) is arranged at the middle position of the top of the battery module (20); the connecting members (23) are respectively arranged on both sides of the circuit board (30) in the width direction and are arranged at intervals along the length direction of the circuit board (30); a collection component is electrically connected between the circuit board (30) and the connecting member (23); the collection component (301) is connected to the connecting member (23) in a one-to-one correspondence; The circuit board (30) collects operating condition data of each battery cell (22) through the collection component (301).

3. The battery pack according to claim 1, wherein: The operating condition data includes at least one of voltage data, current data and temperature data.

4. The battery pack according to claim 1, wherein: Each of the battery modules (20) comprises an end plate (21) and a cable tie (24). The battery module (20) is provided with end plates (21) at both ends along its length direction; a plurality of battery cells (22) are located between the two end plates (21), and the cable tie (24) is arranged around the two end plates (21) and the plurality of battery cells (22).

5. The battery pack according to claim 4, wherein: The circuit board (30) is used for connecting to the battery management system (10), and has a first rigid connection portion (31) at one end thereof facing the battery management system (10). The first rigid connection part (31) comprises an adapter (311), and the adapter (311) is connected to the first rigid connection part (31) through a wire (50). Connecting the battery management system (10).

6. The battery pack according to claim 5, wherein: The adapter (311) comprises a second interface (3111) and a second plug (3112) connected to each other. One of the second interface (3111) and the second plug (3112) is provided on the wire (50).

7. The battery pack according to claim 5, wherein: An end plate (21) on the battery module (20) arranged corresponding to the circuit board (30) provided with the first rigid connection part (31) and close to the battery management system (10) is provided with a first circuit board fixing seat (211) connected to the first rigid connection part (31).

8. The battery pack according to claim 5, wherein: A second rigid connection portion (32) is provided at one end of the circuit board (30) facing another adjacent circuit board (30), and the second rigid connection portion (32) is connected to another adjacent circuit board (30) through the connector assembly (40).

9. The battery pack according to claim 8, wherein: One of the end plates (21) on the battery module (20) which is arranged corresponding to the circuit board (30) provided with the second rigid connection part (32) and is away from the battery management system (10) has a second circuit board fixing seat (212) connected to the second rigid connection part (32) on its top.

10. The battery pack according to claim 5, wherein: A flexible bending portion (35) is provided at one end of the circuit board (30) facing another adjacent circuit board (30). The flexible bending portion (35) is suspended above the installation interval reserved between two adjacent battery modules (20), and the flexible bending portion (35) is connected to the other adjacent circuit board (30) through the connector assembly (40).

11. The battery pack according to claim 10, wherein: One of the end plates (21) of the battery module (20) is arranged corresponding to the circuit board (30) provided with the flexible bending portion (35), and is spaced apart from the flexible bending portion (35) along the height direction of the battery module (20).

12. The battery pack according to claim 1, wherein: It also includes a plurality of circuit board support members (60), with a circuit board support member (60) being disposed on the top of each of the battery modules (20); The circuit board support (60) comprises a support portion (61) and a wing plate portion (62) connected to each other; The support portion (61) is disposed between the circuit board (30) and the battery module (20), and the wing plate portion (62) is offset from the circuit board (30).

13. The battery pack according to claim 12, wherein: The support portion (61) is arranged between the circuit board (30) and the battery module (20), and a limiting strip (621) is provided on a side of the wing plate portion (62) close to the circuit board (30), and the limiting strip (621) extends toward the circuit board (30) to limit the circuit board (30) along the width direction of the battery module (20).

14. The battery pack according to claim 13, wherein: The wing plate portion (62) is provided with a limiting portion (63) extending from the top of the battery module (20) to the bottom of the battery module (20) at a position away from the edge of the support portion (61). The limiting portion (63) can limit the battery cells (22) in the battery module (20) along the width direction of the battery pack.

15. The battery pack according to claim 1, wherein: A positioning pin (25) is provided on the top of the battery module (20) close to the circuit board. The circuit board (30) is provided with a positioning hole, and the positioning hole is sleeved on the positioning pin (25).

16. The battery pack according to claim 1, wherein: The circuit board (30) is provided with a plurality of avoidance holes (36), and the plurality of avoidance holes (36) correspond one-to-one to a plurality of explosion-proof valves provided on a plurality of battery cells (22) in the battery module (20).

17. The battery pack according to claim 1, wherein: The circuit board (30) is a flexible circuit board.

18. The battery pack according to claim 1, wherein: The plurality of battery modules (20) and the plurality of circuit boards (30) are arranged in an array. A plurality of the circuit boards (30) in the same column are sequentially connected in series to form a circuit board string, a plurality of the circuit board strings are arranged side by side and spaced apart along the width direction of the battery pack, and the battery management system (10) connects a plurality of the circuit board strings in parallel.

19. The battery pack according to claim 1, wherein: Also includes a cover (70), The battery management system (10), the battery module (20) and the circuit board (30) are all arranged in the cover (70).

20. An electrical device, wherein: A battery pack comprising any one of claims 1 to 19.

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