Battery devices and electrical equipment

Abstract

This application discloses a battery device and an electrical appliance. The battery device includes a battery box, battery cells, a main circuit board, an auxiliary circuit board, functional devices, and a first wiring harness assembly. The battery cells are disposed within the battery box; the main circuit board is disposed within the battery box and electrically connected to the battery cells; the auxiliary circuit board is disposed within the battery box and has a first conductive line and a second conductive line; the functional devices are disposed on the auxiliary circuit board; the first wiring harness assembly includes a first wire and a second wire. One end of the first wire is disposed on the auxiliary circuit board and electrically connected to the functional device through the first conductive line, and the other end of the first wire is electrically connected to the main circuit board; one end of the second wire is disposed on the auxiliary circuit board and electrically connected to the functional device through the second conductive line, and the other end of the second wire is electrically connected to the main circuit board or to other electrical components in the battery device. The technical solution of this application can improve the reliability of the connection between the wiring harness and the functional devices.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device using the battery device. Background Technology

[0002] In related technologies, functional devices such as resistors or capacitors are installed on some wiring harnesses of battery devices. However, due to the inevitable bending of the wiring harness during assembly and the vibration of the battery device during subsequent use, the connection points between the functional devices and the wiring harness are prone to breakage or poor contact due to stress, affecting the reliability of the connection between the functional devices and the wiring harness. Utility Model Content

[0003] The main objective of this application is to provide a battery device and electrical equipment designed to improve the reliability of the connection between the wiring harness and functional components.

[0004] To achieve the above objectives, the battery device proposed in this application includes:

[0005] Battery box;

[0006] Battery cells are located inside the battery box;

[0007] The main circuit board is located inside the battery box and is electrically connected to the individual battery cells.

[0008] An auxiliary circuit board is located inside the battery box and has a first conductive line and a second conductive line.

[0009] Functional devices, the functional devices are located on the auxiliary circuit board; and

[0010] The first wiring harness assembly includes a first wire body and a second wire body. One end of the first wire body is disposed on the auxiliary circuit board and is electrically connected to the functional device through a first conductive line. The other end of the first wire body is electrically connected to the main circuit board.

[0011] One end of the second wire is located on the auxiliary circuit board and is electrically connected to the functional device through the second conductive line. The other end of the second wire is electrically connected to the main circuit board or to other electrical components in the battery device.

[0012] The battery device in this application places the first and second wires of the first wiring harness assembly, as well as the functional devices, on an auxiliary circuit board. The first wire and the functional devices are electrically connected via a first conductive line on the auxiliary circuit board, and the second wire and the functional devices are electrically connected via a second conductive line. This achieves electrical connection between the first wiring harness assembly and the functional devices through the auxiliary circuit board as an intermediate carrier. In this case, the electrical connection points of the first wiring harness assembly and the functional devices are both located on the auxiliary circuit board. As a rigid material, the auxiliary circuit board can resist bending deformation and vibration breakage, ensuring a stable connection between the first wiring harness assembly and the functional devices on the auxiliary circuit board, thereby improving the reliability of the connection between the wiring harness and the functional devices.

[0013] In some embodiments, the auxiliary circuit board has a first hole and a second hole, and a first conductive line is embedded in the auxiliary circuit board and located between the first hole and the second hole.

[0014] The end of the first wire that is away from the electrical connection to the main circuit board is inserted into the first hole and is electrically connected to the first conductive line.

[0015] The functional device is inserted into the second hole at the end away from the electrical connection of the second conductive line and is electrically connected to the first conductive line.

[0016] Therefore, by inserting the first wire body and the functional device into the first and second holes of the auxiliary circuit board, the connection area between the first wire body and the functional device and the auxiliary circuit board can be increased, which in turn helps to further improve the stability of the first wire body and the functional device on the auxiliary circuit board, so as to improve the reliability of the connection between the first wire harness assembly and the functional device.

[0017] In some embodiments, the auxiliary circuit board is provided with a third hole and a fourth hole, and the second conductive line is embedded in the auxiliary circuit board and located between the third hole and the fourth hole;

[0018] The end of the functional device that is away from the electrical connection to the first conductive line is inserted into the third hole and is electrically connected to the second conductive line;

[0019] One end of the second wire is inserted into the fourth hole and electrically connected to the second conductive line.

[0020] Therefore, by inserting the functional device portion and the second wire portion into the third and fourth holes of the auxiliary circuit board, the connection area between the second wire and the functional device and the auxiliary circuit board can be increased, which in turn helps to further improve the stability of the second wire and the functional device on the auxiliary circuit board, so as to improve the reliability of the connection between the first wire harness assembly and the functional device.

[0021] In some embodiments, the functional devices are soldered to the auxiliary circuit board;

[0022] And / or, the first wire is soldered to the auxiliary circuit board;

[0023] And / or, the second wire is soldered to the auxiliary circuit board.

[0024] Therefore, by welding the functional components and the auxiliary circuit board together, both electrical connection and mechanical fixation can be achieved simultaneously, thus improving the ease of assembly between the functional components and the auxiliary circuit board. Similarly, welding the first wire body and the auxiliary circuit board together allows for both electrical connection and mechanical fixation, further improving the ease of assembly between the first wire body and the auxiliary circuit board. Furthermore, welding connections offer the advantage of stable connections, further enhancing the reliability of the connection between the first wire body, the second wire body, and the functional components on the auxiliary circuit board.

[0025] In some embodiments, the functional device includes:

[0026] The main body and the auxiliary circuit board are in contact; and

[0027] Two electrical connection parts are connected to the main body, one of which is electrically connected to the first conductive line and the other is electrically connected to the second conductive line.

[0028] Therefore, by placing the main body of the functional device in contact with the auxiliary circuit board, most of the functional device can be supported on the auxiliary circuit, further improving the stability and reliability of the connection of the functional device on the auxiliary circuit.

[0029] In some embodiments, the main body has a first surface and two second surfaces, the first surface being in contact with the auxiliary circuit board;

[0030] Two second surfaces are connected to the first surface, and two electrical connection parts are respectively connected to the two second surfaces.

[0031] Therefore, the two electrical connection parts are respectively set on the two second surfaces in the main body, and the two second surfaces are connected to the first surface, so that the electrical connection parts can be relatively close to the auxiliary circuit board, while not being blocked by the first surface. This allows the electrical connection parts to be well exposed on the periphery of the main body, facilitating electrical connection with the auxiliary circuit board and improving assembly convenience.

[0032] In some embodiments, the first line includes a first main body segment and a first electrical connection segment connected to each other, the first main body segment being electrically connected to the main circuit board, and the first electrical connection segment being electrically connected to the first conductive line.

[0033] The second line includes a second main body segment and a second electrical connection segment connected to each other. The second main body segment is electrically connected to the main circuit board or other electrical components, and the second electrical connection segment is electrically connected to the second conductive line.

[0034] The battery device also includes a restraint structure disposed on an auxiliary circuit board and configured to fix a portion of the first main body segment and / or a portion of the second main body segment to the auxiliary circuit board.

[0035] Therefore, by fixing the first main body segment and / or the second main body segment to the auxiliary circuit board through the binding structure, the first wire and / or the second wire can be further configured as mechanical connection points with the auxiliary circuit board at the position of the binding structure. Thus, when the first wire harness assembly is pulled, the binding structure's limiting and fixing prevents the pulling force from being transmitted to the electrical connection point between the first wire harness assembly and the auxiliary circuit board. This further improves the tensile strength of the electrical connection point between the first wire harness assembly and the auxiliary circuit board, thereby enhancing the reliability of the connection between the first wire harness assembly and the auxiliary circuit board.

[0036] In some embodiments, the restraint structure includes a first winding member that is wound around a first wire and an auxiliary circuit board to secure the first main body segment to the auxiliary circuit board.

[0037] Therefore, a simple winding operation is sufficient when using the binding structure, which improves the convenience of binding and fixing the first thread. Furthermore, when subsequent repairs or replacements are needed, the first winding piece can be easily unwrapped, facilitating subsequent maintenance.

[0038] In some embodiments, the first wrapping element is adhesive tape;

[0039] And / or, the first winding element is wound at least once around the outside of the first main body segment and the auxiliary circuit board.

[0040] Therefore, the tape is strip-shaped, resulting in a relatively large width and relatively small thickness for the first winding element. This increases the coverage area of ​​the first winding element on the first wire and auxiliary circuit board, thereby improving the binding and limiting effect on the first wire. Simultaneously, it reduces the stacking size in the thickness direction, thus minimizing space occupation. Wrapping the first winding element at least one turn increases the coverage area on the first wire and auxiliary circuit board, further enhancing the binding and limiting effect on the first wire.

[0041] In some embodiments, the restraint structure includes a second winding member that is wound around the second main body segment and the auxiliary circuit board to secure the second main body segment to the auxiliary circuit board.

[0042] This allows for simple winding operations when using the binding structure, thus improving the convenience of binding and securing the second thread. Furthermore, in case of subsequent repairs or replacements, the second winding component can be easily unwrapped, facilitating future maintenance.

[0043] In some embodiments, the second wrapping element is an adhesive tape;

[0044] And / or, the second winding member is wound at least once around the outside of the second main body section and the auxiliary circuit board.

[0045] Therefore, the tape is strip-shaped, resulting in a relatively large width and relatively small thickness for the second winding element. This increases the coverage area of ​​the second winding element on the second wire and auxiliary circuit board, thereby improving the binding and limiting effect on the second wire. Wrapping the second winding element at least one turn further increases the coverage area on the second wire and auxiliary circuit board, which in turn further enhances the binding and limiting effect on the second wire.

[0046] In some embodiments, the battery device further includes a second wiring harness assembly, and the restraint structure is further configured to secure the second wiring harness assembly to an auxiliary circuit board.

[0047] Therefore, by using a binding structure to bind and fix the second wiring harness assembly of the auxiliary circuit board accessory to the auxiliary circuit board, the second wiring harness assembly of the accessory can also be limited in position, improving the stability and orderliness of the installation of the second wiring harness assembly within the battery device. At the same time, the use of a binding structure for binding and limiting both the first and second wiring harness simplifies the structural setup.

[0048] In some embodiments, the first wiring harness assembly and the second wiring harness assembly are respectively disposed on opposite sides of the auxiliary circuit board;

[0049] And / or, the second wiring harness assembly includes at least two wires arranged side by side.

[0050] Therefore, by arranging the first and second wiring harness assemblies on opposite sides of the auxiliary circuit board, the space on both sides of the auxiliary circuit board can be fully utilized, improving the convenience of arranging the first and second wiring harness assemblies and functional devices on the auxiliary circuit. The second wiring harness assembly is configured to include at least two wires, allowing the wires of the auxiliary circuit board accessories to be bound and fixed to the auxiliary circuit as much as possible, improving the stability and orderliness of this portion of the wires installed within the battery device.

[0051] In some embodiments, the number of the first conductive line, the second conductive line, the functional device, the first wire body, and the second wire body are all at least two;

[0052] Each first wire is electrically connected to a functional device through a first conductive line, and each second wire is electrically connected to a functional device through a second conductive line.

[0053] Therefore, at least two functional devices and a first wiring harness assembly can be integrated and arranged on the auxiliary circuit board, which helps to improve the supplementary effect of the functional devices and simplifies the structural setup.

[0054] In some embodiments, the functional devices are of the same type, or at least two functional devices are of different types.

[0055] Therefore, when all functional components are of the same type, the type of functional component is singular, facilitating the connection and installation of at least two functional components. When at least two functional components are of different types, the type of functional component is diversified, making it convenient to combine the functions of different types of functional components.

[0056] In some embodiments, the functional device includes one of a resistor, a capacitor, or an inductor;

[0057] Alternatively, the functional components include at least two of resistors, capacitors, or inductors, configured as a combination of components in series and / or parallel.

[0058] Therefore, by including one of the functional components—resistors, capacitors, or inductors—the type and quantity of functional components remain singular, facilitating their installation and arrangement. By including at least two of the functional components—resistors, capacitors, or inductors—the type and quantity of functional components become more diverse, allowing for the combination of functions from different types of components. Furthermore, the component assembly can utilize only a single first wiring harness assembly, thus simplifying the number of first wiring harness assemblies required.

[0059] In some embodiments, the main circuit board is a battery monitoring unit, and the functional device is a resistor;

[0060] The second wire is electrically connected to the end of the functional device away from the battery cell. The battery cell is constructed as other electrical components, and the second wire is configured to collect the voltage information of the battery cell.

[0061] Therefore, the first wiring harness assembly is constructed as a voltage sampling harness to collect voltage information from each individual battery cell. After the battery monitoring unit collects the voltage information from each battery cell, it can further transmit it to the battery management unit. A resistor is integrated in series with the first wiring harness assembly as a functional device to reduce current and thus protect the circuit.

[0062] In some embodiments, the main circuit board is a battery management unit, and the functional device is a resistor;

[0063] The second wire, at the end away from the electrical connection to the functional device, is electrically connected to the battery management unit, which is constructed as other electrical components.

[0064] The first wire is provided with a first melting section, and the second wire is provided with a second melting section. Both the first melting section and the second melting section are provided with corresponding explosion-proof valves of the battery cells, so as to melt and short-circuit when the explosion-proof valve is depressurized.

[0065] Therefore, when the explosion-proof valve depressurizes, the first and second melting parts on the first wiring harness assembly can be melted by the high-temperature ejection from the corresponding explosion-proof valve, causing a short circuit. Simultaneously, because a resistor is integrated in series on the first wiring harness assembly, the current flowing through it during a short circuit is greater than the current flowing through it when no short circuit occurs. Therefore, when the battery management unit detects that the current flowing through the first wiring harness assembly exceeds a preset value, it can detect the depressurization activation of the explosion-proof valve, thus achieving the detection of the valve's operating status. Using a resistor as a functional device allows it to limit the current in the first wiring harness assembly, ensuring a smaller current flow when no short circuit occurs and a larger change during a short circuit. This improves the accuracy of the battery management unit's current detection on the first wiring harness assembly, thereby enhancing the reliability of the explosion-proof valve's operating status detection.

[0066] In some embodiments, the main circuit board is a battery monitoring unit, and the functional components are resistors or capacitors;

[0067] The battery monitoring unit has an equalization switch, and the end of the first wire that is away from the functional device is electrically connected to the equalization switch;

[0068] The second wire, at the end furthest from the functional device, is electrically connected to the positive terminal of the battery cell, which is constructed as other electrical components.

[0069] The battery assembly also includes a third wiring harness assembly, one end of which is electrically connected to the negative terminal of the battery cell, and the other end of which is electrically connected to an equalization switch.

[0070] Therefore, when the voltage of a single battery cell is higher than that of other battery cells, the battery monitoring unit can control the equalization circuit to close, thus putting the equalization circuit into a conductive state. At this time, the charge of the battery cell can be transferred to functional devices for consumption or storage, thereby achieving discharge equalization of the over-voltage battery cells and improving the voltage consistency of each battery cell.

[0071] On the other hand, the electrical equipment proposed in this application also includes the battery device in any of the above embodiments. Attached Figure Description

[0072] 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0073] Figure 1 This is a schematic diagram of the structure of one embodiment of the vehicle of this application;

[0074] Figure 2 This is an exploded structural diagram of an example of the battery device of this application;

[0075] Figure 3 This is an exploded structural diagram of a single battery cell according to an embodiment of this application;

[0076] Figure 4 This is a schematic diagram of the assembly structure of an embodiment of the auxiliary circuit board, the first wire harness assembly, and the second wire harness of this application.

[0077] Figure 5 for Figure 4 A schematic diagram showing the connection between the first wiring harness assembly and the main circuit board;

[0078] Figure 6 for Figure 4 An exploded structural diagram of the auxiliary circuit board, the first wiring harness assembly, and the second wiring harness;

[0079] Figure 7 Another perspective schematic diagram of the assembly structure of the auxiliary circuit board and the first wire harness assembly of this application;

[0080] Figure 8 This is a schematic diagram of the electrical connection between the first wiring harness assembly and the main circuit according to an embodiment of this application;

[0081] Figure 9 This is a schematic diagram of the electrical connection between the first wiring harness assembly and the main circuit in another embodiment of this application;

[0082] Figure 10 This is a schematic diagram of the electrical connection between the first wiring harness assembly and the main circuit in yet another embodiment of this application;

[0083] Figure 11 This is a schematic diagram of the electrical connection between the first wiring harness assembly and the main circuit in another embodiment of this application;

[0084] Figure 12 This is a schematic diagram of the electrical connection between the first wiring harness assembly and the main circuit in yet another embodiment of this application;

[0085] Figure 13 This is a schematic diagram of the electrical connection between the first wiring harness assembly and the main circuit in another embodiment of this application.

[0086] Explanation of icon numbers:

[0087] 100. Battery assembly; 1. Battery box; 1a. Receptacle; 11. Box cover; 12. Box body; 13. Fast charging interface; 20. Battery cell; 20A. Battery pack; 21. End cap; 21a. Terminal post; 21c. Explosion-proof valve; 22. Housing; 23. Electrode assembly; 231. Tab; 30. Main circuit board; 30A. Battery monitoring unit; 30A1. Equalization switch; 30B. Battery management unit; 40. Auxiliary circuit board; 41. First conductive line; 42. Second conductive line; 43. First hole; 44. Second hole; 45. Third hole; 46. Fourth hole; 50. Functional components; 51. Main body; 5 11. First surface; 513. Second surface; 53. Electrical connection portion; 60. First wire harness assembly; 61. First wire body; 611. First main body segment; 612. First electrical connection segment; 613. First melting portion; 63. Second wire body; 631. Second main body segment; 632. Second electrical connection segment; 633. Second melting portion; 70. Binding structure; 71. First winding element; 73. Second winding element; 80. Second wire harness assembly; 90. Third wire harness assembly; 101. Precharge relay; 103. Main positive relay; 105. Main negative relay; 200. Controller; 300. Motor; 1000. Vehicle.

[0088] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0089] The technical solutions of the embodiments of this application 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 application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0090] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application 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.

[0091] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0092] Furthermore, the use of terms such as "first" and "second" in this application 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 those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0093] A battery device, or energy storage device, is widely used not only in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. A battery device may include a battery box and individual battery cells housed within the battery box. The battery box may include a box body and a cover that fits over the box body to enclose a cavity containing the individual battery cells. The individual battery cell is the smallest unit comprising a battery, typically including a casing and an electrode assembly housed within the casing. The electrode assembly is the component in the individual battery cell where the electrochemical reaction actually occurs, and may include a positive electrode, a negative electrode, and a separator located between them, formed by winding or stacking the positive electrode, negative electrode, and separator. Furthermore, at least two individual battery cells within the battery box may be connected in series, in parallel, or in a hybrid connection including both series and parallel connections.

[0094] Furthermore, during the design process of battery devices, there may inevitably be insufficient space in some areas, resulting in limitations on the placement and size of the circuit board, making it impossible to install certain functional components such as resistors, capacitors, or inductors; or the circuit board may have been designed with some functional components omitted. In such cases, wiring harnesses are typically used to supplement and integrate these functional components in series. For example, a voltage sampling wiring harness used to sample the voltage information of individual battery cells may have a resistor integrated in series to achieve current limiting protection.

[0095] However, in battery devices, these functional components are typically soldered directly into the wiring harness and then protected with heat-shrink tubing. In this case, due to the inevitable bending of the wiring harness during assembly and the vibration of the battery device during subsequent use, the connection points between the functional components and the wiring harness are susceptible to stress. This can lead to risks such as breakage or poor contact at the connection points, affecting the reliability of the connection between the functional components and the wiring harness.

[0096] Therefore, based on the above considerations, in order to improve the reliability of the connection between functional components and wiring harness in a battery device, this application proposes a novel battery device. This battery device innovatively places both the functional components and the first wiring harness assembly on an auxiliary circuit board, which serves as an intermediate carrier, thereby achieving resistance to bending and vibration breakage through the auxiliary circuit board.

[0097] Furthermore, it should be noted that the battery device proposed in this application can be applied to electrical devices. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Further, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0098] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0099] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0100] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0101] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery case 1 and a battery cell 20; the battery case 1 has a receiving cavity 1a, and the battery cell 20 is disposed inside the battery case 1.

[0102] The battery case 1 can be used to form a receiving cavity 1a to provide a space for accommodating the battery cell 20. The battery case 1 can adopt various structures. In some embodiments, the battery case 1 can include a cover 11 and a body 12 that overlap each other to jointly define the receiving cavity 1a for accommodating the battery cell 20. In this case, the body 12 can provide accommodating support for the battery cell 20. In addition, both the cover 11 and the body 12 can be hollow structures with an opening on one side. In this case, the opening side of the cover 11 can cover the opening side of the body 12. Of course, the cover 11 can also be a plate structure and cover the opening side of the body 12. In addition, the battery case 1 formed by the cover 11 and the body 12 can be of various shapes, such as a cylinder, a cuboid, etc. Furthermore, the cover 11 and the body 12 can be arranged along a first direction.

[0103] A battery cell 20 refers to the smallest unit that makes up the battery device 100. The number of battery cells 20 can be one, two, or more. When there are multiple battery cells 20, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be arranged in one direction to form a battery pack 20A. The battery device 100 may include only one battery pack 20A, or it may include at least two battery packs 20A arranged side-by-side. For example, when the battery device 100 is in normal installation and use, the multiple battery cells 20 in the battery pack 20A can be arranged along a first horizontal direction, while the battery device 100 can have at least two battery packs 20A arranged in a second horizontal direction, which intersects with the first horizontal direction.

[0104] In addition, the battery device 100 may include other structures, such as busbars, for electrical connection between multiple battery cells 20. Furthermore, each battery cell 20 may be a secondary or primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, cuboid, or other shapes.

[0105] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0106] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improving reliability. Functional components such as terminals 21a can be provided on end cap 21. Terminals 21a can be used to electrically connect to electrode assembly 23 for outputting or inputting electrical energy into battery cell 20. In some embodiments, end cap 21 can also be provided with an explosion-proof valve 21c for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical components inside the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0107] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0108] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode plates without active material each constitute a tab 231. The positive and negative tabs may be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the terminals 21a to form a current loop.

[0109] Please refer to the reference. Figure 4 and Figure 5 ,as well as Figures 8 to 13 In one embodiment of this application, the battery device 100 further includes a main circuit board 30, an auxiliary circuit board 40, a functional device 50, and a first wiring harness assembly 60; the main circuit board 30 is disposed inside the battery box 1 and is electrically connected to the battery cell 20; the auxiliary circuit board 40 is disposed inside the battery box 1 and has a first conductive line 41 and a second conductive line 42; the functional device 50 is disposed on the auxiliary circuit board 40; the first wiring harness assembly 60 includes a first wire 61 and a second wire 63, one end of the first wire 61 is disposed on the auxiliary circuit board 40 and is electrically connected to the functional device 50 through the first conductive line 41, and the other end of the first wire 61 is electrically connected to the main circuit board 30; one end of the second wire 63 is disposed on the auxiliary circuit board 40 and is electrically connected to the functional device 50 through the second conductive line 42, and the other end of the second wire 63 is electrically connected to the main circuit board 30, or electrically connected to other electrical components in the battery device 100.

[0110] The main circuit board 30 may be a Battery Management Unit (BMU) 30B, as described below. The BMU 30B is used to coordinate the operation of the entire battery device 100. The BMU 30B may have functions including, but not limited to, those described below: The BMU 30B can perform state estimation of the battery device 100, including calculating the SOC (State of Charge), SOH (State of Health), and SOP (State of Power) of the battery device 100; or, the BMU 30B can formulate a power balancing strategy for the battery device 100, including determining which battery cells 20 need to be balanced and calculating the balancing time; or, the BMU 30B can communicate with external devices such as the vehicle 1000 or a charging station.

[0111] Of course, the main circuit board 30 can also be a Cell Supervision Circuit (CSC) 30A, which can be used to collect data. The battery supervision circuit 30A may include, but is not limited to, the functions of the following examples: the battery supervision circuit 30A can collect temperature and voltage information of the battery cells 20; or, the battery monitoring can be used to balance the charge of the battery cells 20.

[0112] Alternatively, the main circuit board 30 can also be a thermal management system (TMS). The thermal management system can be used to control the operation of heat exchange mechanisms such as liquid cooling plates or liquid cooling pipes in the battery device 100, so as to control the temperature of the battery cell 20.

[0113] Therefore, this application does not limit the type of the main circuit board 30, as long as the structure includes a circuit board within the battery device 100.

[0114] In addition, it should be noted that the electrical connection between the main circuit board 30 and the battery cell 20 can be made through other wiring harnesses independent of the first wiring harness assembly 60. For example, when the first wiring harness assembly 60 is used to collect the working status of the explosion-proof valve 21c by melting and short-circuiting when the explosion valve is depressurized, the main circuit board 30 can be electrically connected to the battery cell 20 through wiring harnesses such as temperature sampling harnesses and voltage sampling harnesses.

[0115] Of course, the electrical connection between the main circuit board 30 and the battery cell 20 can also be made through the first wiring harness assembly 60. For example, when the first wiring harness assembly 60 is configured as a voltage sampling harness to collect voltage information from the battery cell 20, as described below, the main circuit board 30 can be electrically connected to the battery cell 20 through the first wiring harness assembly 60. Of course, based on this, the main circuit board 30 can also be further electrically connected to the battery cell 20 through wiring harnesses for temperature sampling, etc.

[0116] The auxiliary circuit board 40 can be used to mount the functional device 50 and the first wiring harness assembly 60, serving as an intermediate carrier between them. Simultaneously, the auxiliary circuit board 40 can electrically connect the first wire 61 in the first wiring harness assembly 60 to the functional device 50 via a first conductive line 41, and can electrically connect the second wire 63 in the first wiring harness assembly 60 to the functional device 50 via a second conductive line 42, thereby achieving an indirect electrical connection between the functional device 50 and the first wiring harness assembly 60, i.e., the series integration of the functional device 50 on the first wiring harness assembly 60. Furthermore, the number of the first conductive line 41 and the second conductive line 42 can be one, or two or more, adaptable to the number of functional devices 50 and the first wiring harness assembly 60. Additionally, the auxiliary circuit board 40 can be mounted and fixed within the battery box 1, or it can be mounted and fixed to other objects within the battery device 100. The auxiliary circuit board 40 can be installed and fixed by means of threaded connection, snap-fit ​​connection, or adhesive connection, etc. This application does not limit the installation position, installation object, or installation method of the auxiliary circuit board 40 in the battery box 1. In addition, the shape of the auxiliary circuit board 40 can be rectangular, square, or circular, etc., and this application does not limit the shape of the auxiliary circuit board 40.

[0117] Functional device 50 can supplement functionality by being connected in series with the first wiring harness assembly 60. Functional device 50 can be, but is not limited to, a resistor, capacitor, or inductor. For example, when the first wiring harness assembly 60 is used to collect voltage information from the battery cell 20, as described below, and is configured as a voltage sampling harness, functional device 50 can be a resistor to reduce current in the circuit and decrease the possibility of overcurrent. Alternatively, when the first wiring harness assembly 60 is a fast charging harness, functional device 50 can be a common-mode inductor to suppress electromagnetic interference.

[0118] Furthermore, the functional device 50 may include only one type of device, such as a resistor, a capacitor, or an inductor. Alternatively, the functional device 50 may include at least two types of resistors, capacitors, or inductors, or a combination of at least two of these types to form a device assembly. For example, the functional device 50 may include a resistor and a capacitor, a resistor and an inductor, a capacitor and an inductor, or a resistor, a capacitor, and an inductor. The individual resistors, capacitors, or inductors in the device assembly may be connected in series, in parallel, or in a hybrid configuration of series and parallel connections via conductive lines on the auxiliary circuit board 40. This device assembly is then connected in series between the first wire 61 and the second wire 63 in the first wire harness assembly 60. Additionally, the functional device 50 may be connected to the auxiliary circuit board 40 by soldering or by adhesive bonding, as long as electrical connection of the functional device 50 on the auxiliary circuit board 40 is achieved.

[0119] The first wiring harness assembly 60 establishes an electrical connection between the functional device 50 and the main circuit board 30 via the first wire 61, and a second wire 63 establishes an electrical connection between the functional device 50 and the main circuit board 30, or between the functional device 50 and other electrical components in the battery device 100. The first wire 61 and the main circuit board 30 can be directly connected; however, they can also be indirectly connected. For example, when the main circuit board 30 is a battery management unit 30B, and the functional device 50 is a pre-charge resistor (described below), the end of the first wire 61 furthest from the pre-charge resistor can be electrically connected to the output terminal of the pre-charge relay 101. Then, the input terminal of the pre-charge relay 101 is further connected to the battery management unit 30B via a wiring harness, thus achieving an indirect connection between the first wire 61 and the main circuit board 30. Alternatively, when the first wiring harness assembly 60 is a fast charging harness and the main circuit board 30 is a battery management unit 30B, the end of the first wire 61 away from the functional device 50 can be electrically connected to the main positive relay 103 and the main negative relay 105 of the battery device 100, and the main positive relay 103 and the main negative relay 105 can be further electrically connected to the battery management unit 30B through the wiring harness.

[0120] Furthermore, when the end of the second wire 63 furthest from the functional device 50 is electrically connected to the main circuit board 30, thus forming a circuit between the first wiring harness assembly 60 and the main circuit board 30, it can be said that the second wire 63 also establishes an electrical connection between the functional device 50 and the main circuit board 30. For example, when the first wiring harness assembly 60 is used to collect the operating status of the explosion-proof valve 21c as described below, the end of the second wire 63 furthest from the functional device 50 can be electrically connected to the main circuit board 30.

[0121] Furthermore, when the end of the second wire 63 away from the functional device 50 is electrically connected to other electrical components in the battery device 100, these other electrical components refer to electrical devices other than the main circuit board 30. For example, these other electrical components could be battery cells 20; of course, when the functional device 50 is a pre-charge resistor as described below, these other electrical components could be the main positive relay 103 of the battery device 100, and the end of the second wire 63 away from the pre-charge resistor could be electrically connected to the output terminal of the main positive relay 103 of the battery device 100. Alternatively, when the first wiring harness assembly 60 is a fast charging harness as described above, these other electrical components could be the fast charging interface 13 of the battery device 100, and the end of the second wire 63 away from the functional device 50 could be electrically connected to the fast charging interface 13 of the battery device 100. Alternatively, when the first wiring harness assembly 60 is a CAN bus, resistors can be connected in series at both ends of the CAN-H and CAN-L lines of the CAN bus. These resistors can be configured as functional devices 50. Modules within the battery device 100 that require communication, such as the battery management unit 30B, battery monitoring unit 30A, and thermal management system, can be connected in parallel to the CAN bus to enable the transmission of communication signals between these modules. In this case, the main circuit board 30 can be one of the modules within the battery device 100 that require communication, such as the battery management unit 30B, battery monitoring unit 30A, and thermal management system. The other electrical components can be the other of these modules. It should be noted that the first wiring harness assembly 60 is indirectly electrically connected to the main circuit board 30 and other electrical components.

[0122] As can be seen, when the second wire 63 is electrically connected to other electrical components, this application does not limit the type of the other electrical components, as long as they are in the battery device 100 other than the main circuit board 30.

[0123] The battery device 100 in this application's technical solution places the first wire 61 and the second wire 63 of the first wiring harness assembly 60, as well as the functional device 50, on an auxiliary circuit board 40. The first wire 61 and the functional device 50 are electrically connected via a first conductive line 41 on the auxiliary circuit board 40, and the second wire 63 and the functional device 50 are electrically connected via a second conductive line 42. This achieves electrical connection between the first wiring harness assembly 60 and the functional device 50 through the auxiliary circuit board 40 as an intermediate carrier. At this time, the electrical connection points of the first wiring harness assembly 60 and the functional device 50 are both located on the auxiliary circuit board 40. Since the auxiliary circuit board 40 is made of a rigid material, it can resist bending deformation and vibration breakage, achieving a stable connection between the first wiring harness assembly 60 and the functional device 50 on the auxiliary circuit board 40, thereby improving the reliability of the connection between the wiring harness and the functional device 50.

[0124] Please refer to Figure 8 In one embodiment of this application, the main circuit board 30 is a battery monitoring unit 30A, and the functional device 50 is a resistor; the end of the second wire 63 that is away from the functional device 50 is electrically connected to the battery cell 20, the battery cell 20 is constructed as other electrical components, and the second wire 63 is configured to collect the voltage information of the battery cell 20.

[0125] Since the battery pack 20A typically includes multiple stacked battery cells 20, these multiple battery cells 20 can be connected in series. Therefore, there can be multiple first wiring harness assemblies 60. The second wires 63 of two first wiring harness assemblies 60, which are electrically connected away from one end of the functional device 50, can be electrically connected to the positive terminal 21a and negative terminal 21a of the two end battery cells 20 in the stacking direction of the battery cells 20 in the battery pack 20A, respectively. The second wires 63 of the other first wiring harness assemblies 60, which are electrically connected away from one end of the functional device 50, can be electrically connected to the connection point between each pair of adjacent battery cells 20 in the remaining battery cells 20.

[0126] In this embodiment, the first wiring harness assembly 60 is configured as a voltage sampling harness to collect voltage information of each battery cell 20. After the battery monitoring unit 30A collects the voltage information of the battery cell 20, it can be further transmitted to the battery management unit 30B. At this time, a resistor is integrated in series with the first wiring harness assembly 60 to reduce the current, thereby protecting the circuit.

[0127] Please refer to Figure 9In one embodiment of this application, the main circuit board 30 is a battery management unit 30B, and the functional device 50 is a resistor; the end of the second wire 63 that is away from the functional device 50 is electrically connected to the battery management unit 30B, and the battery management unit 30B is constructed as other electrical components; the first wire 61 is provided with a first melting part 613, and the second wire 63 is provided with a second melting part 633. The first melting part 613 and the second melting part 633 are both corresponding to the explosion-proof valve 21c of the battery cell 20, so as to be configured to melt and short-circuit when the explosion-proof valve 21c is depressurized.

[0128] The first wire 61 and the second wire 63 can extend along the stacking direction of the multiple battery cells 20 in the battery pack 20A. One end of the first wire 61 and the second wire 63 in the extending direction can be electrically connected to the main circuit board 30, and the other end can be electrically connected to the functional device 50, realizing the series connection of the functional device 50 between the first wire 61 and the second wire 63. The first melting part 613 and the second melting part 633 can be configured as heat-melting insulating parts at the positions of the first wire 61 and the second wire 63 corresponding to the explosion-proof valve 21c, so that when the explosion-proof valve 21c is activated to release pressure and spray high-temperature substances, the heat-melting insulating parts can be melted, realizing the contact short circuit of the metal conductive parts inside the first wire 61 and the second wire 63. The number of the first melting section 613 and the second melting section 633 can be designed according to the number of battery cells 20 in the battery pack 20A. That is, the first melting section 613 and the corresponding second melting section 633 constitute a set of melting sections. Each set of melting sections corresponds to the explosion-proof valve 21c in a battery cell 20, so that when the explosion-proof valve 21c on any battery cell 20 in the battery pack 20A is activated to release pressure, it can be detected by the first wiring harness assembly 60. In addition, the first melting section 613 can be located in the part of the first main body section 611 of the first wire 61 outside the auxiliary circuit board 40; the second melting section 633 can be located in the part of the second main body section 631 of the second wire 63 outside the auxiliary circuit board 40.

[0129] In this embodiment, when the explosion-proof valve 21c depressurizes, the first melting part 613 and the second melting part 633 on the first wiring harness assembly 60 can be melted by the high-temperature position ejected by the corresponding explosion-proof valve 21c, causing a short circuit. Simultaneously, since a resistor is integrated in series on the first wiring harness assembly 60, the current flowing through the first wiring harness assembly 60 during a short circuit can be greater than the current flowing through the first wiring harness assembly 60 when no short circuit occurs. Therefore, when the battery management unit 30B detects that the current flowing through the first wiring harness assembly 60 is greater than a preset value, it can detect the depressurization activation of the explosion-proof valve 21c, thereby realizing the detection of the working state of the explosion-proof valve 21c, so that the battery device 100 can promptly issue alarms and corresponding power-off protection. The functional device 50 can limit the current in the first wiring harness assembly 60, so that the current in the first wiring harness assembly 60 is small when no short circuit occurs, and can change significantly when a short circuit occurs. This improves the detection accuracy of the current in the first wiring harness assembly 60 by the battery management unit 30B, and thus improves the reliability of detecting the working status of the explosion-proof valve 21c.

[0130] Please refer to Figure 10 In one embodiment of this application, the main circuit board 30 is a battery monitoring unit 30A, and the functional device 50 is a resistor or capacitor; the battery monitoring unit 30A has an equalization switch 30A1, and the end of the first wire 61 that is electrically connected away from the functional device 50 is electrically connected to the equalization switch 30A1; the end of the second wire 63 that is electrically connected away from the functional device 50 is electrically connected to the positive terminal 21a of the battery cell 20, and the battery cell 20 is constructed as other electrical components; the battery device 100 also includes a third wiring harness assembly 90, one end of the third wiring harness assembly 90 is electrically connected to the negative terminal 21a of the battery cell 20, and the other end is electrically connected to the equalization switch 30A1.

[0131] The battery cell 20, the first lead wire 61, the main circuit board 30, and the second lead wire 63 constitute an equalization circuit, and the equalization switch 30A1 on the main circuit board 30 can be used to control the conduction and disconnection of this circuit. The equalization switch 30A1 can be a transistor or a relay, etc.

[0132] In this embodiment, when the voltage of a single battery cell 20 is higher than the voltage of other battery cells 20, the battery monitoring unit 30A can control the equalization switch closure, making the equalization circuit conductive. At this time, the charge of the battery cell 20 can be transferred to the functional device 50 for consumption or storage. When the voltage of a single battery cell 20 is equal to the voltage of other battery cells 20, the battery monitoring unit 30A can control the equalization switch 30A1 to open, making the equalization circuit disconnected. This achieves discharge equalization for battery cells 20 with excessively high voltage, improving the voltage consistency of each battery cell 20. Furthermore, the voltage detection of the battery cell 20 can be performed using a voltage sampling harness as described above.

[0133] Of course, in some embodiments, the third wiring harness assembly 90 can be replaced with the first wiring harness assembly 60, and the positive terminal 21a and negative terminal 21a of the battery cell 20 can be directly connected through different first wiring harness assemblies 60.

[0134] Please refer to Figure 11 In one embodiment of this application, the main circuit board 30 is a battery management unit 30B, and the functional device 50 is a resistor; the end of the first wire 61 away from the functional device 50 can be connected to the output terminal of the precharge relay 101, and the precharge relay 101 can be connected to the input terminal of the main positive relay 103 through a wiring harness; the end of the second wire 63 away from the functional device 50 can be connected to the output terminal of the main positive relay 103; the main circuit board 30 is also connected to the main positive relay 103, the main negative relay 105 of the battery device 100, and the precharge relay 101.

[0135] In this embodiment, since the end of the first wire 61 furthest from the functional device 50 is connected to the pre-charge relay 101, and the pre-charge relay 101 is connected to the main circuit board 30, it can be said that the end of the first wire 61 furthest from the functional device 50 is indirectly electrically connected to the main circuit board 30. The end of the second wire 63 furthest from the functional device 50 is connected to the main positive relay 103, so the main positive relay 103 can be considered as another electrical component. At this time, when the battery device 100 starts, the battery management cell can first control the main negative relay 105 to close, and then close the pre-charge relay 101, to sample a small current to pre-charge the pre-charge capacitor in the motor 300 inside the vehicle 1000; after the pre-charge is completed, the main positive relay 103 is closed, and then the pre-charge relay 101 is opened, reducing the possibility of a short circuit when the pre-stored capacitor is in a de-energized state and the main positive relay 103 and main negative relay 105 are directly closed, thus improving the reliability of the battery device 100 powering the vehicle 1000.

[0136] Please refer to Figure 12In one embodiment of this application, the main circuit board 30 is a battery management unit 30B, and the first wiring harness assembly 60 can be a fast charging harness; the end of the first wire 61 of the two fast charging harnesses that is away from the functional device 50 can be connected to the main positive relay 103 and the main negative relay 105 respectively, and the end of the second wire 63 of the two fast charging harnesses that is away from the functional device 50 can be connected to the fast charging interface 13 of the battery device 100 provided on the battery box 1.

[0137] In this embodiment, since the end of the first wire 61 furthest from the functional device 50 is connected to the main positive relay 103 or the main negative relay 105, and the main positive relay 103 or the main negative relay 105 is connected to the main circuit board 30, it can be said that the end of the first wire 61 furthest from the functional device 50 is indirectly electrically connected to the main circuit board 30. The end of the second wire 63 furthest from the functional device 50 is connected to the fast charging interface 13, so it can be said that the fast charging interface 13 constitutes another electrical component. In this case, the functional device 50 can be a common-mode inductor to suppress electromagnetic interference.

[0138] Please refer to Figure 13 In one embodiment of this application, the main circuit board 30 is a battery management unit 30B, whose components include a battery monitoring unit 30A. The first wiring harness assembly 60 can be a CAN bus. The first wire 61 and the second wire 63 in the first wiring harness assembly 60 can be CAN-H lines and CAN-L lines, respectively. The main circuit board 30 and other components can be connected to the first wire 61 and the second wire 63 via the CAN-H lines and CAN-L lines in the CAN bus, so that the main circuit board 30 and other components can be connected in parallel on the CAN bus, so that the main circuit board 30 and other components can transmit communication signals between the main circuit board 30 and other components.

[0139] In this embodiment, resistors can be connected in series between the two ends of the first wire 61 and the second wire 63 as functional devices 50 in order to suppress electromagnetic interference between the charging pile and the vehicle 1000.

[0140] Please refer to the reference. Figure 4 , Figure 6 as well as Figure 7 In one embodiment of this application, the auxiliary circuit board 40 is provided with a first hole 43 and a second hole 44. The first conductive line 41 is embedded in the auxiliary circuit board 40 and located between the first hole 43 and the second hole 44. The end of the first wire 61 that is away from the auxiliary circuit board 40 is inserted into the first hole 43 and is electrically connected to the first conductive line 41. The end of the functional device 50 that is away from the second conductive line 42 is inserted into the second hole 44 and is electrically connected to the first conductive line 41.

[0141] When portions of the first wire 61 and the functional device 50 are respectively inserted into the first hole 43 and the second hole 44, they can contact the first conductive line 41, thereby achieving an electrical connection between the first wire 61 and the functional device 50 through the first conductive line 41. The shape of the first hole 43 can be circular, or it can be square, rectangular, etc., and this application does not limit the shape of the first hole 43. Similarly, the shape of the second hole 44 can be circular, or it can be square, rectangular, etc., and this application does not limit the shape of the second hole 44. Furthermore, the first conductive line 41 can extend along the arrangement direction of the first hole 43 and the second hole 44, or it can extend in other directions, including being located between the first hole 43 and the second hole 44.

[0142] In this embodiment, since a portion of the first wire 61 and a portion of the functional device 50 are inserted into the first hole 43 and the second hole 44 of the auxiliary circuit board 40, the connection area between the first wire 61 and the functional device 50 and the auxiliary circuit board 40 can be increased. This is beneficial to further improve the stability of the first wire 61 and the functional device 50 on the auxiliary circuit board 40, so as to improve the reliability of the connection between the first wire harness assembly 60 and the functional device 50.

[0143] Of course, this application is not limited to this. In other embodiments, the first conductive line 41 may also be disposed on the surface of the auxiliary circuit board 40. In this case, the connection end between the first line 61 and the functional device 50 may be disposed on the surface of the auxiliary circuit board 40.

[0144] Please refer to the reference. Figure 4 , Figure 6 as well as Figure 7 In one embodiment of the application, the auxiliary circuit board 40 is provided with a third hole 45 and a fourth hole 46. The second conductive line 42 is embedded in the auxiliary circuit board 40 and located between the third hole 45 and the fourth hole 46. The end of the functional device 50 that is away from the first conductive line 41 is inserted into the third hole 45 and is electrically connected to the second conductive line 42. One end of the second wire 63 is inserted into the fourth hole 46 and is electrically connected to the second conductive line 42.

[0145] When portions of the functional device 50 and the second wire 63 are respectively inserted into the third hole 45 and the fourth hole 46, they can contact the second conductive line 42, thereby achieving an electrical connection between the second wire 63 and the functional device 50 through the second conductive line 42. The shape of the third hole 45 can be circular, square, or rectangular, etc., and this application does not limit the shape of the third hole 45. Similarly, the shape of the fourth hole 46 can be circular, square, or rectangular, etc., and this application does not limit the shape of the fourth hole 46. Furthermore, the second conductive line 42 can extend along the arrangement direction of the third hole 45 and the fourth hole 46, or it can extend in other directions, including being located between the third hole 45 and the fourth hole 46.

[0146] In this embodiment, since a portion of the functional device 50 and a portion of the second wire 63 are inserted into the third hole 45 and the fourth hole 46 of the auxiliary circuit board 40, the connection area between the second wire 63 and the functional device 50 and the auxiliary circuit board 40 can be increased. This is beneficial to further improve the stability of the second wire 63 and the functional device 50 on the auxiliary circuit board 40, so as to improve the reliability of the connection between the first wire harness assembly 60 and the functional device 50.

[0147] Of course, this application is not limited to this. In other embodiments, the second conductive line 42 may also be disposed on the surface of the auxiliary circuit board 40. In this case, the connection end between the second line 63 and the functional device 50 may be disposed on the surface of the auxiliary circuit board 40.

[0148] In one embodiment of this application, the functional device 50 is soldered to the auxiliary circuit board 40.

[0149] In this embodiment, the functional device 50 and the auxiliary circuit board 40 are fixed by welding, which allows for both electrical connection and mechanical fixation between the two, thereby improving the ease of assembly between the functional device 50 and the auxiliary circuit board 40. At the same time, welding also has the advantage of stable connection, further improving the reliability of the connection of the functional device 50 on the auxiliary circuit board 40.

[0150] In one embodiment of this application, the first wire 61 is welded to the auxiliary circuit board 40.

[0151] In this embodiment, the first wire 61 and the auxiliary circuit board 40 are fixed by welding, which allows for both electrical connection and mechanical fixation between the two, thereby improving the ease of assembly between the first wire 61 and the auxiliary circuit board 40. At the same time, welding also has the advantage of stable connection, further improving the reliability of the connection of the first wire 61 on the auxiliary circuit board 40.

[0152] In one embodiment of this application, the second wire 63 is welded to the auxiliary circuit board 40.

[0153] In this embodiment, the second wire 63 and the auxiliary circuit board 40 are fixed by welding, which allows for both electrical connection and mechanical fixation between the two, thereby improving the ease of assembly between the second wire 63 and the auxiliary circuit board 40. At the same time, welding also has the advantage of stable connection, further improving the reliability of the connection of the second wire 63 on the auxiliary circuit board 40.

[0154] Please refer to Figure 5 In one embodiment of this application, the functional device 50 includes a main body 51 and two electrical connection parts 53. The main body 51 is in contact with the auxiliary circuit board 40. The two electrical connection parts 53 are connected to the main body 51, wherein one electrical connection part 53 is electrically connected to the first conductive line 41 and the other electrical connection part 53 is electrically connected to the second conductive line 42.

[0155] The main body 51 serves as the primary component of the functional device 50, fulfilling its corresponding function, while the electrical connection 53 serves as the component for electrical connection with the auxiliary circuit board 40. For example, when the functional device 50 is a resistor, the main body 51 can be the resistor body, and the electrical connection 53 can be the lead. When the functional device 50 is a capacitor, the main body 51 can be the capacitor body, and the electrical connection 53 can be the lead.

[0156] In this embodiment, the main body 51 of the functional device 50 is arranged in contact with the auxiliary circuit board 40, so that most of the functional device 50 can be supported on the auxiliary circuit, thereby further improving the stability and reliability of the connection of the functional device 50 on the auxiliary circuit.

[0157] Please refer to Figure 5 In one embodiment of this application, the main body 51 has a first surface 511 and two second surfaces 513. The first surface 511 is in contact with the auxiliary circuit board 40. The two second surfaces 513 are connected to the first surface 511, and two electrical connection parts 53 are respectively connected to the two second surfaces 513.

[0158] When the main body 51 is cylindrical, the first surface 511 can be a ring-shaped side circumferential surface of the main body 51, and the two second surfaces 513 can be two end faces of the main body 51 along its axial direction. When the main body 51 is cuboid, the first surface 511 can be one side circumferential surface of the main body 51, and the two second surfaces 513 can be two end faces of the main body 51 along its length. Of course, one of the two second surfaces 513 can also be one end face of the main body 51 along its length, and the other can be one side circumferential surface of the main body 51. Therefore, the two electrical connection portions 53 in the functional device 50 can be located on opposite sides of the main body 51, or they can be located on adjacent sides of the main body 51.

[0159] In this embodiment, two electrical connection portions 53 are respectively disposed on two second surfaces 513 in the main body 51, and the two second surfaces 513 are connected to the first surface 511, so that the electrical connection portions 53 can be relatively close to the auxiliary circuit board 40 without being blocked by the first surface 511. At this time, the two electrical connection portions 53 can be well exposed on the periphery of the main body 51, which facilitates electrical connection between them and the auxiliary circuit board 40 and improves the convenience of assembly.

[0160] Please refer to the reference. Figures 4 to 6 In one embodiment of this application, the first wire 61 includes a first main body segment 611 and a first electrical connection segment 612 connected to each other. The first main body segment 611 is electrically connected to the main circuit board 30, and the first electrical connection segment 612 is electrically connected to the first conductive line 41. The second wire 63 includes a second main body segment 631 and a second electrical connection segment 632 connected to each other. The second main body segment 631 is electrically connected to the main circuit board 30 or other electrical components, and the second electrical connection segment 632 is electrically connected to the second conductive line 42. The battery device 100 also includes a restraining structure 70, which is disposed on the auxiliary circuit board 40 and configured to fix a portion of the first main body segment 611 and / or a portion of the second main body segment 631 to the auxiliary circuit board 40.

[0161] The first main body segment 611 can be partially disposed on the auxiliary circuit board 40 and partially located outside the auxiliary circuit board 40 for electrical connection with the main circuit board 30. The first electrical connection segment 612 can be disposed on the auxiliary circuit board 40 and can at least partially be used for electrical connection with the auxiliary circuit board 40. For example, when one end of the first wire 61 is inserted into the first hole 43 as described above, the first electrical connection segment 612 in the first wire 61 can be inserted into the first hole 43, and this first electrical connection segment 612 can be entirely located within the first hole 43, or it can be partially located within the first hole 43 and partially located outside the first hole 43. The second main body segment 631 can be partially disposed on the auxiliary circuit board 40 and partially located outside the auxiliary circuit board 40 for electrical connection with the main circuit board 30 or other devices. The second electrical connection segment 632 can be disposed on the auxiliary circuit board 40 and can at least partially be used for electrical connection with the auxiliary circuit board 40. For example, when one end of the second wire 63 is inserted into the fourth hole 46 for connection as described above, the second electrical connection segment 632 in the second wire 63 can be inserted into the fourth hole 46. This second electrical connection segment 632 can be entirely located within the fourth hole 46, or it can be partially located within and partially outside the fourth hole 46. The binding structure 70 can be used to bind and limit the portions of the first main body segment 611 and / or the second main body segment 631 corresponding to the auxiliary circuit board 40, thereby fixing the first main body segment 611 and / or the second main body segment 631 onto the auxiliary circuit board 40. The binding structure 70 can be a winding component as described below, or it can be a non-conductive adhesive, such as structural adhesive. The binding structure 70 is used to fix the first main body segment 611 and / or the second main body segment 631. This means that the binding structure 70 can be used to fix only a portion of the first main body segment 611 to the auxiliary circuit board 40, or it can be used to fix only a portion of the second main body segment 631 to the auxiliary circuit board 40, or it can be used to fix both a portion of the first main body segment 611 and a portion of the second main body segment 631 to the auxiliary circuit board 40.

[0162] In this embodiment, the first main body segment 611 and / or the second main body segment 631 are fixed to the auxiliary circuit board 40 by the binding structure 70, so that the first wire 61 and / or the second wire 63 can be further configured as mechanical connection points with the auxiliary circuit board 40 at the position of the binding structure 70. At this time, when the first wire harness assembly 60 is pulled, due to the limiting and fixing of the binding structure 70, the pulling force will not be transmitted to the electrical connection point between the first wire harness assembly 60 and the auxiliary circuit board 40, thereby further improving the tensile strength of the electrical connection point between the first wire harness assembly 60 and the auxiliary circuit board 40, so as to improve the reliability of the connection of the first wire harness assembly 60 on the auxiliary circuit board 40.

[0163] Please refer to the reference. Figures 4 to 6In one embodiment of this application, the binding structure 70 includes a first winding member 71, which is wound around a first main body segment 611 and an auxiliary circuit board 40 to fix the first main body segment 611 to the auxiliary circuit board 40.

[0164] The first wrapping element 71 can be used to wrap around the outside of the first wire body 61 and the auxiliary circuit board 40 to further fix the portion 53 that is not electrically connected to the auxiliary circuit board 40 onto the auxiliary circuit board 40. The first wrapping element 71 can be adhesive tape as described below, or it can be a cable tie or binding strap. Furthermore, the first wrapping element 71 can wrap around the outside of the first wire body 61 and the auxiliary circuit board 40 once, or more times, or even half a turn, as long as it at least covers and wraps around the first main body segment 611 of the first wire body 61.

[0165] In this embodiment, the binding structure 70 is configured as the first winding member 71, which allows for simple winding operations when using the binding structure 70, thereby improving the convenience of binding and fixing the first thread 61. Furthermore, when subsequent maintenance or replacement is required, the first winding member 71 can be easily unwrapped, facilitating subsequent maintenance.

[0166] In one embodiment of this application, the first wrapping element 71 is an adhesive tape.

[0167] In this embodiment, the first winding member 71 is configured as an adhesive tape. The tape is strip-shaped, resulting in a relatively large width and relatively small thickness for the first winding member 71. This increases the wrapping coverage area of ​​the first winding member 71 on the first wire 61 and the auxiliary circuit board 40, thereby improving the binding and limiting effect on the first wire 61. Simultaneously, it reduces the stacking size in the thickness direction, thus minimizing space occupation. Furthermore, the tape has adhesive properties, facilitating self-bonding and connection after wrapping and improving the stability of the wrapping process.

[0168] In one embodiment of this application, the first winding member 71 is wound at least once around the outside of the first main body segment 611 and the auxiliary circuit board 40.

[0169] In this embodiment, the first winding member 71 is wound at least one turn, which can increase the winding coverage area of ​​the first wire 61 and the auxiliary circuit board 40, thereby further improving the binding and limiting effect on the first wire 61.

[0170] Please refer to the reference. Figures 4 to 6 In one embodiment of this application, the binding structure 70 includes a second winding member 73, which is wound around the second main body segment 631 and the auxiliary circuit board 40 to fix the second main body segment 631 to the auxiliary circuit board 40.

[0171] The first wrapping element 71 can be used to wrap around the outside of the second wire body 63 and the auxiliary circuit board 40 to further fix the portion 53 that is not electrically connected to the auxiliary circuit board 40 onto the auxiliary circuit board 40. The second wrapping element 73 can be adhesive tape as described below, or it can be a cable tie or binding strap. Furthermore, the second wrapping element 73 can be wrapped around the outside of the second wire body 63 and the auxiliary circuit board 40 one turn, or more turns, or even half a turn, as long as it at least covers and wraps around the second main body segment 631 of the second wire body 63.

[0172] In this embodiment, the binding structure 70 is configured as the second winding member 73, which allows for simple winding operations when using the binding structure 70, thereby improving the convenience of binding and fixing the second thread 63. Furthermore, when subsequent maintenance or replacement is required, the second winding member 73 can be easily unwrapped, facilitating subsequent maintenance.

[0173] In one embodiment of this application, the second wrapping element 73 is an adhesive tape.

[0174] In this embodiment, the second winding member 73 is configured as an adhesive tape. The tape is strip-shaped, resulting in a relatively large width and relatively small thickness for the second winding member 73. This increases the wrapping coverage area of ​​the second winding member 73 on the second wire 63 and the auxiliary circuit board 40, thereby improving the binding and limiting effect on the second wire 63. Simultaneously, it reduces the stacking size in the thickness direction, thus minimizing space occupation. Furthermore, the tape has adhesive properties, facilitating self-bonding after wrapping and improving the stability of the wrapping process.

[0175] In one embodiment of this application, the second winding member 73 is wound at least one turn around the outer side of the second main body segment 631 and the auxiliary circuit board 40.

[0176] In this embodiment, the second winding member 73 is wound at least one turn, which can increase the winding coverage area of ​​the second wire 63 and the auxiliary circuit board 40, thereby further improving the binding and limiting effect on the second wire 63.

[0177] Please refer to the reference. Figures 4 to 6 In one embodiment of this application, the battery device 100 further includes a second wiring harness assembly 80, and the restraint structure 70 is further configured to fix the second wiring harness assembly 80 to the auxiliary circuit board 40.

[0178] The second wiring harness assembly 80 can be another wiring harness in the battery device 100 that is independent of the first wiring harness assembly 60. For example, when the first wiring harness assembly 60 is used to monitor the operating status of the explosion-proof valve 21c as described above, the second wiring harness assembly 80 can be a coolant temperature sampling harness, etc. This coolant temperature sampling harness can be connected to a temperature probe, which can extend into the inlet and / or outlet ports on the battery device 100. The inlet and outlet ports can be connected to the liquid cooling plate or liquid cooling pipe of the battery device 100, thereby realizing the acquisition of coolant temperature information. At the same time, the second wiring harness assembly 80 can also be connected to the thermal management system or the battery management system to upload the coolant temperature information. Alternatively, when the first wiring harness assembly 60 is a CAN bus, the second wiring harness assembly 80 can be a fast charging harness, etc. Therefore, this application does not limit the type of the second wiring harness assembly 80. As long as it is a wiring harness within the battery device 100 used for electrically connecting at least two electrical components and is relatively close to the auxiliary circuit board 40, it can be bound and fixed together with the first wiring harness assembly 60 to the auxiliary circuit board 40 by the binding structure 70. In addition, the second wiring harness assembly 80 may include one wire, or it may include two or more wires.

[0179] In this embodiment, the second wiring harness assembly 80 attached to the auxiliary circuit board 40 is also bound and fixed to the auxiliary circuit board 40 by the binding structure 70, so that the second wiring harness assembly 80 can also be limited, improving the stability and orderliness of the installation of the second wiring harness assembly 80 in the battery device 100. At the same time, the first wiring harness assembly 60 and the second wiring harness are bound and limited by the binding structure 70, which also helps to simplify the structural setup.

[0180] Please refer to Figure 6 In one embodiment of this application, the auxiliary circuit board 40 can be configured as a cuboid, and its length direction is consistent with the arrangement direction of the first hole 43, the second hole 44, the third hole 45, and the third hole 45. It can also be consistent with the extension direction of the first wire harness assembly 60 and the second wire harness assembly 80, thereby facilitating the compact binding and fixing of the first wire harness assembly 60 and the second wire harness to the auxiliary circuit board 40 along the length direction surrounding the auxiliary circuit board 40.

[0181] Please refer to the reference. Figures 4 to 6 In one embodiment of this application, the first wiring harness assembly 60 and the second wiring harness assembly 80 are respectively disposed on opposite sides of the auxiliary circuit board 40.

[0182] In this embodiment, the first wire harness assembly 60 and the second wire harness assembly 80 are distributed on opposite sides of the auxiliary circuit board 40, so that the space on opposite sides of the auxiliary circuit board 40 can be fully utilized, and the convenience of arranging the first wire harness assembly 60, the second wire harness assembly 80 and the functional device 50 on the auxiliary circuit can be improved.

[0183] Please refer to Figure 4 In one embodiment of this application, the second wiring harness assembly 80 includes at least two wires arranged side by side.

[0184] In this embodiment, the second wiring harness assembly 80 is configured to include at least two wires, so that the wires attached to the auxiliary circuit board 40 can be bound and fixed to the auxiliary circuit as much as possible, thereby improving the stability and orderliness of the installation of this part of the wires in the battery device 100.

[0185] In one embodiment of this application, the number of the first conductive line 41, the second conductive line 42, the functional device 50, the first wire 61, and the second wire 63 are all at least two; each first wire 61 is electrically connected to a functional device 50 through a first conductive line 41, and each second wire 63 is electrically connected to a functional device 50 through a second conductive line 42.

[0186] In this embodiment, the number of the first conductive line 41, the second conductive line 42, the functional device 50, and the first wire harness assembly 60 is set to at least two, so that at least two functional devices 50 and the first wire harness assembly 60 can be integrated and arranged on the auxiliary circuit board 40, which is beneficial to improve the supplementary effect of the functional device 50 and simplify the structural setup.

[0187] In one embodiment of this application, all functional devices 50 are of the same type, for example, all are resistors, all are capacitors, or all are inductors. In this case, the type of functional device 50 is uniform, which facilitates the connection and installation of at least two functional devices 50.

[0188] In one embodiment of this application, at least two functional devices 50 are of different types. For example, at least two functional devices 50 may include a resistor and a capacitor, or a resistor and an inductor. In this case, the types of functional devices 50 are diversified, which facilitates the combination of the functions of different types of functional devices 50.

[0189] In one embodiment of this application, the functional device 50 includes one of a resistor, a capacitor, or an inductor. In this case, the type and quantity of the functional device 50 are both uniform, facilitating its installation and arrangement.

[0190] In one embodiment of this application, the functional device 50 includes at least two of resistors, capacitors, or inductors, configured as a device combination, wherein the device combination is connected in series and / or in parallel. In this case, the type and quantity of the functional devices 50 are more diverse, facilitating the combination of the functions possessed by different types of functional devices 50. Furthermore, the device combination can utilize only one first wiring harness assembly 60, thereby simplifying the number of first wiring harness assemblies 60. The device combination being connected in series and / or in parallel means that the resistors, capacitors, or inductors in the device combination are connected in a single series connection, a single parallel connection, or a mixture of series and parallel connections. Moreover, the resistors, capacitors, or inductors in the device combination are connected using conductive lines on the auxiliary circuit board 40.

[0191] Please refer to the reference. Figure 2 as well as Figures 4 to 8In one embodiment of this application, the battery device 100 includes a battery box 1, a battery cell 20, a main circuit board 30, an auxiliary circuit board 40, a functional device 50, and a first wiring harness assembly 60. The battery cell 20 is disposed inside the battery box 1. The main circuit board 30 is disposed inside the battery box 1 and is electrically connected to the battery cell 20. The auxiliary circuit board 40 is disposed inside the battery box 1 and has a first conductive line 41 and a second conductive line 42. The functional device 50 is disposed on the auxiliary circuit board 40. The first wiring harness assembly 60 includes a first wire 61 and a second wire 63. One end of the first wire 61 is disposed on the auxiliary circuit board 40 and is electrically connected to the functional device 50 through the first conductive line 41. The other end of the first wire 61 is electrically connected to the main circuit board 30. One end of the second wire 63 is disposed on the auxiliary circuit board 40 and is electrically connected to the functional device 50 through the second conductive line 42. The other end of the second wire 63 is electrically connected to other electrical components in the battery device 100. The auxiliary circuit board 40 has a first hole 43 and a second hole 44. A first conductive line 41 is embedded in the auxiliary circuit board 40 and located between the first hole 43 and the second hole 44. One end of the first wire 61, away from the main circuit board 30, is inserted into the first hole 43 and is electrically connected to the first conductive line 41. One end of the functional device 50, away from the second conductive line 42, is inserted into the second hole 44 and is electrically connected to the first conductive line 41. The auxiliary circuit board 40 has a third hole 45 and a fourth hole 46. The second conductive line 42 is embedded in the auxiliary circuit board 40 and located between the third hole 45 and the fourth hole 46. One end of the functional device 50, away from the first conductive line 41, is inserted into the third hole 45 and is electrically connected to the second conductive line 42. One end of the second wire 63 is inserted into the fourth hole 46 and is electrically connected to the second conductive line 42. Functional device 50 is soldered to auxiliary circuit board 40; first wire 61 is soldered to auxiliary circuit board 40; second wire 63 is soldered to auxiliary circuit board 40. Functional device 50 includes a main body 51 and two electrical connection parts 53. The main body 51 is in contact with the auxiliary circuit board 40; the two electrical connection parts 53 are connected to the main body 51, one of which is electrically connected to the first conductive line 41, and the other is electrically connected to the second conductive line 42. The main body 51 has a first surface 511 and two second surfaces 513. The first surface 511 is in contact with the auxiliary circuit board 40; the two second surfaces 513 are connected to the first surface 511, and the two electrical connection parts 53 are respectively connected to the two second surfaces 513.The first wire 61 includes a first main body segment 611 and a first electrical connection segment 612 connected together. The first main body segment 611 is electrically connected to the main circuit board 30, and the first electrical connection segment 612 is electrically connected to the first conductive line 41. The second wire 63 includes a second main body segment 631 and a second electrical connection segment 632 connected together. The second main body segment 631 is electrically connected to the main circuit board 30 or other electrical components, and the second electrical connection segment 632 is electrically connected to the second conductive line 42. The battery device 100 also includes a binding structure 70, which is disposed on the auxiliary circuit board 40 and configured to fix a portion of the first main body segment 611 and / or a portion of the second main body segment 631 to the auxiliary circuit board 40. The binding structure 70 includes a first wrapping member 71, which is wrapped around the first main body segment 611 and the auxiliary circuit board 40 to fix the first main body segment 611 to the auxiliary circuit board 40. The first wrapping member 71 is an adhesive tape; the first wrapping member 71 is wrapped at least once around the outside of the first main body segment 611 and the auxiliary circuit board 40. The binding structure 70 includes a second winding member 73, which is wound around the second main body segment 631 and the auxiliary circuit board 40 to fix the second main body segment 631 to the auxiliary circuit board 40. The second winding member 73 is an adhesive tape; the second winding member 73 is wound at least one turn around the outside of the second main body segment 631 and the auxiliary circuit board 40. The battery device 100 also includes a second wiring harness assembly 80, and the binding structure 70 is further configured to fix the second wiring harness assembly 80 to the auxiliary circuit board 40. The first wiring harness assembly 60 and the second wiring harness assembly 80 are respectively located on opposite sides of the auxiliary circuit board 40; the second wiring harness assembly 80 includes at least two wires, which are arranged side by side. The main circuit board 30 is a battery monitoring unit 30A, and the functional device 50 is a resistor; the end of the second wire 63 that is away from the functional device 50 is electrically connected to a battery cell 20, the battery cell 20 being constructed as other electrical components, and the second wire 63 is configured to collect voltage information from the battery cell 20.

[0192] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery device, characterized in that, include: Battery box; A battery cell, wherein the battery cell is disposed within the battery case; The main circuit board is located inside the battery box and is electrically connected to the individual battery cells. An auxiliary circuit board is disposed inside the battery box, and the auxiliary circuit board has a first conductive line and a second conductive line. Functional device, wherein the functional device is disposed on the auxiliary circuit board; as well as The first wiring harness assembly includes a first wire body and a second wire body. One end of the first wire body is disposed on the auxiliary circuit board and is electrically connected to the functional device through the first conductive line. The other end of the first wire body is electrically connected to the main circuit board. One end of the second wire is disposed on the auxiliary circuit board and electrically connected to the functional device through the second conductive line. The other end of the second wire is electrically connected to the main circuit board or to other electrical components in the battery device.

2. The battery device as claimed in claim 1, characterized in that, The auxiliary circuit board has a first hole and a second hole, and the first conductive line is embedded in the auxiliary circuit board and located between the first hole and the second hole; The end of the first wire away from the electrical connection to the main circuit board is inserted into the first hole and is electrically connected to the first conductive line. The functional device is inserted into the second hole at the end away from the electrical connection to the second conductive line and is electrically connected to the first conductive line.

3. The battery device as claimed in claim 1, characterized in that, The auxiliary circuit board is provided with a third hole and a fourth hole, and the second conductive line is embedded in the auxiliary circuit board and located between the third hole and the fourth hole; The functional device is inserted into the third hole at the end away from the electrical connection to the first conductive line and is electrically connected to the second conductive line. One end of the second wire is inserted into the fourth hole and electrically connected to the second conductive line.

4. The battery device as claimed in claim 1, characterized in that, The functional components are soldered to the auxiliary circuit board; And / or, the first wire is soldered to the auxiliary circuit board; And / or, the second wire is soldered to the auxiliary circuit board.

5. The battery device as claimed in claim 1, characterized in that, The functional device includes: The main body is in contact with the auxiliary circuit board; and Two electrical connection parts are connected to the main body, wherein one electrical connection part is electrically connected to the first conductive line and the other electrical connection part is electrically connected to the second conductive line.

6. The battery device as claimed in claim 5, characterized in that, The main body has a first surface and two second surfaces, and the first surface is in contact with the auxiliary circuit board. The two second surfaces are connected to the first surface, and the two electrical connection portions are respectively connected to the two second surfaces.

7. The battery device according to any one of claims 1 to 6, characterized in that, The first line includes a first main body segment and a first electrical connection segment connected to each other. The first main body segment is electrically connected to the main circuit board, and the first electrical connection segment is electrically connected to the first conductive line. The second line includes a second main body segment and a second electrical connection segment connected to each other. The second main body segment is electrically connected to the main circuit board or the other electrical components, and the second electrical connection segment is electrically connected to the second conductive line. The battery device further includes a restraint structure disposed on the auxiliary circuit board and configured to fix a portion of the first main body segment and / or a portion of the second main body segment to the auxiliary circuit board.

8. The battery device as claimed in claim 7, characterized in that, The binding structure includes a first winding member, which is wound around the first main body segment and the auxiliary circuit board to fix the first main body segment to the auxiliary circuit board.

9. The battery device as claimed in claim 8, characterized in that, The first wrapping element is adhesive tape; And / or, the first winding member is wound at least once around the outside of the first body segment and the circuit board.

10. The battery device as claimed in claim 7, characterized in that, The binding structure includes a second winding member that is wound around the second main body segment and the auxiliary circuit board to fix the second main body segment to the auxiliary circuit board.

11. The battery device as claimed in claim 10, characterized in that, The second wrapping element is adhesive tape; And / or, the second winding member is wound at least one turn around the outside of the second body segment and the circuit board.

12. The battery device as claimed in claim 7, characterized in that, The battery device further includes a second wiring harness assembly, and the restraint structure is further configured to secure the second wiring harness assembly to the auxiliary circuit board.

13. The battery device as claimed in claim 12, characterized in that, The first wiring harness assembly and the second wiring harness assembly are respectively located on opposite sides of the auxiliary circuit board; And / or, the second wiring harness assembly includes at least two wires, which are arranged side by side.

14. The battery device according to any one of claims 1 to 6, characterized in that, The number of the first conductive line, the second conductive line, the functional device, the first wire, and the second wire are all at least two; Each of the first wires is electrically connected to a functional device through a first conductive line, and each of the second wires is electrically connected to a functional device through a second conductive line.

15. The battery device as claimed in claim 14, characterized in that, All of the functional devices are of the same type, or at least two of the functional devices are of different types.

16. The battery device according to any one of claims 1 to 6, characterized in that, The functional device includes one of a resistor, a capacitor, or an inductor; Alternatively, the functional device may include at least two of the resistor, capacitor, or inductor to form a device combination, wherein the device combination is in series and / or in parallel.

17. The battery device according to any one of claims 1 to 6, characterized in that, The main circuit board is a battery monitoring unit, and the functional component is a resistor; The second wire is electrically connected to the battery cell at the end away from the functional device. The battery cell is constructed as the other electrical component. The second wire is configured to collect the voltage information of the battery cell.

18. The battery device according to any one of claims 1 to 6, characterized in that, The main circuit board is a battery management unit, and the functional device is a resistor; The end of the second wire that is away from the electrical connection to the functional device is electrically connected to the battery management unit, which is configured as the other electrical component; The first line body is provided with a first melting section, and the second line body is provided with a second melting section. Both the first melting section and the second melting section are respectively provided with the explosion-proof valve of the battery cell, so as to melt and short-circuit when the explosion-proof valve is depressurized.

19. The battery device according to any one of claims 1 to 6, characterized in that, The main circuit board is a battery monitoring unit, and the functional components are resistors or capacitors; The battery monitoring unit has an equalization switch, and the end of the first wire away from the one electrically connected to the functional device is electrically connected to the equalization switch; The end of the second wire that is away from the electrical connection to the functional device is electrically connected to the positive terminal of the battery cell, and the battery cell is constructed as the other electrical component; The battery device further includes a third wiring harness assembly, one end of which is electrically connected to the negative terminal of the battery cell, and the other end of which is electrically connected to the equalization switch.

20. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 19.

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