Battery device and electric appliance

Abstract

The application relates to the battery technical field, and proposes a battery device and a power utilization equipment. A signal acquisition part is electrically connected with an FPC body. The signal acquisition part comprises a first transmission end arranged on a first battery monomer, a second transmission end arranged on a second battery monomer, and a weakened connection part for disconnecting the electrical connection between the first transmission end and the second transmission end. The first battery monomer and the second battery monomer are oppositely arranged in a first direction, the first transmission end and the second transmission end are opposite in the first direction, and the weakened connection part is adapted to be fractured and disconnect the first transmission end and the second transmission end when the first battery monomer and the second battery monomer appear to be inflated and the displacement generated in the first direction exceeds a displacement threshold. Therefore, inflation early warning can be realized, the safety of the battery device can be improved, the safety hidden danger can be reduced, early warning can be realized, the FPC body can be prevented from being fractured, only the signal acquisition part needs to be replaced, and the maintenance cost can be reduced.

Description

Technical Field

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

[0002] In related technologies, FPC (Flexible Printed Circuit) components are used for signal transmission, data acquisition, and power distribution. Although the flexibility of FPC components can disperse the stress generated by the volume change of battery cells during charging and discharging, and prevent stress concentration in a certain area, thereby reducing the pressure on battery cells and other internal components, FPC components cannot provide early warning of battery cell expansion. They can only break and fail as a whole when the expansion force is too large. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide a battery device and electrical equipment in which the FPC component can provide an early warning system for battery expansion, thereby improving the safety and reliability of the battery device and reducing safety hazards.

[0004] In a first aspect, this application proposes a battery device, which includes: a battery cell assembly and an FPC assembly. The FPC assembly includes: an FPC body and a signal acquisition unit. The signal acquisition unit is electrically connected to the FPC body. The signal acquisition unit includes a first transmission end disposed on a first battery cell, a second transmission end disposed on a second battery cell, and a weakened connection portion for disconnecting the electrical connection between the first transmission end and the second transmission end. The first battery cell and the second battery cell are disposed opposite to each other in a first direction, and the first transmission end and the second transmission end are opposite to each other in the first direction. The weakened connection portion is adapted to break when the first battery cell and the second battery cell expand and the displacement generated in the first direction exceeds a displacement threshold, thereby disconnecting the first transmission end from the second transmission end. One of two adjacent battery cells in the first direction is defined as the first battery cell, and the other is the second battery cell.

[0005] According to the battery device of the present application embodiment, by providing a weakened connection part in the signal acquisition part, the signal transmission circuit can be disconnected through the weakened connection part to issue an early warning that the expansion force exceeds the safety threshold, thereby realizing expansion warning, improving the safety of the battery device, and reducing safety hazards. It can not only enrich the function of FPC component to reduce the safety hazards of battery device, but also provide early warning to avoid the FPC body from breaking. In subsequent maintenance, only the signal acquisition part needs to be replaced, which can also reduce maintenance costs.

[0006] According to some embodiments of this application, the signal acquisition unit includes: a substrate and a wire disposed on the substrate, the wire being electrically connected to the FPC body, the substrate defining a weakened connection portion, the wire being stacked on the weakened connection portion, and adapted to break synchronously with the weakened connection portion.

[0007] In the above technical solution, under the premise of realizing expansion warning, the weakened connection is formed on the substrate instead of on the wire, which can also ensure the reliability and stability of the signal transmission circuit or signal acquisition circuit where the wire is located, so as to improve the reliability and stability of the FPC component.

[0008] According to some embodiments of this application, the substrate includes: a first plate segment covering a first battery cell, a second plate segment covering a second battery cell, and a connecting plate segment, wherein the connecting plate segment is located between the first plate segment and the second plate segment, and a hollow portion is provided on the connecting plate segment to define a weakened connection portion.

[0009] In the above technical solution, by setting a hollow part on the connecting plate segment and thus forming a weakened connection part, a weakened connection part can be formed with a simple structure, which can simplify the substrate structure, reduce material costs, and improve the reliability of the weakened connection part to break first.

[0010] According to some embodiments of this application, the conductor includes: a first conductor segment, a second conductor segment, and a connecting segment. One end of the first conductor segment is electrically connected to the FPC body, and the other end extends to the first board segment and forms a first transmission end. One end of the second conductor segment is electrically connected to the FPC body, and the other end extends to the second board segment and forms a second transmission end. The connecting segment is stacked on the weakened connection portion, and one end is connected to the first transmission end and the other end is connected to the second transmission end.

[0011] In the above technical solution, the first conductor segment, the connecting segment, and the second conductor segment form a complete signal transmission circuit or signal acquisition circuit, while the connecting segment is stacked on the weakened connection part so that it can simultaneously weaken the breakage of the connection part, thereby improving the reliability and stability of the expansion early warning of the signal acquisition part.

[0012] According to some embodiments of this application, the width of the weakened connection is greater than or equal to the wire diameter.

[0013] In the above technical solution, this application makes the width of the weakened connection part greater than or equal to the wire diameter, which can make the synchronous breakage effect of the weakened connection part and the connection segment better, and can reduce the probability that the weakened connection part does not break while the connection segment breaks first, thereby improving the reliability and stability of the expansion warning of the signal acquisition unit.

[0014] According to some embodiments of this application, the battery cell assembly further includes: a busbar, the busbar including a first connection end and a second connection end, the first connection end being electrically connected to a first battery cell, the second connection end being electrically connected to a second battery cell, a first transmission end being located at the first connection end, and a second transmission end being located at the second connection end.

[0015] In the above technical solution, on the one hand, the signal acquisition unit can be set on the busbar to facilitate signal acquisition. On the other hand, the first connection end and the second connection end of the busbar are respectively fixed on the poles of the first battery cell and the second battery cell, so as to move synchronously with the first battery cell and the second battery cell, respectively. Correspondingly, they can drive the first transmission end and the second transmission end to move. The expansion warning of the signal acquisition unit can be linked with the movement of the busbar, and the reliability and stability are higher.

[0016] According to some embodiments of this application, the busbar further includes: a connecting portion connecting the first connecting end and the second connecting end, the connecting portion being located between the first connecting end and the second connecting end, and a weakening connecting portion being stacked on top of the connecting portion.

[0017] In the above technical solution, the connecting part is arc-shaped relative to the busbar surface defined by the first connecting end and the second connecting end, such as being recessed towards the battery cell or recessed away from the battery cell. The size of the recessed part of the connecting part can gradually move towards the busbar surface when the battery cell expands, so as to absorb the expansion amount and avoid busbar breakage. The weakened connecting part is directly stacked on the connecting part, which can make the reliability of the weakened connecting part breaking first higher, and the stability and reliability of the expansion warning higher.

[0018] According to some embodiments of this application, the connecting portion includes: a conventional connecting segment and a weakened connecting segment, wherein the weakened connecting portion is stacked with the weakened connecting segment and is adapted to break when the weakened connecting segment breaks.

[0019] In the above technical solution, the weakened connection section of the busbar can break before the conventional connection section, and when the weakened connection section breaks, it will simultaneously drive the weakened connection part to break, so as to realize the linkage expansion warning between the busbar and the signal acquisition unit.

[0020] According to some embodiments of this application, the connecting portion includes a plurality of arc-shaped connecting segments, and at least one arc-shaped connecting segment is provided with a groove to form a weakened connecting segment, and the weakened connecting portion is disposed on one side of the groove.

[0021] According to some embodiments of this application, the first connecting end and the second connecting end define the busbar surface, and the connecting portion includes a plurality of arc-shaped connecting segments. At least one arc-shaped connecting segment has a curvature relative to the busbar surface that is less than the curvature of the other arc-shaped connecting segments, and the arc-shaped connecting segment with a curvature less than that of the other arc-shaped connecting segments is formed as a weakened connecting segment.

[0022] In the above technical solution, different degrees of arched bending can be used at the middle connection position of the busbar and combined with the weakened connection part on the FPC component to connect them together. When the expansion safety is about to fail, the weakened connection section with the lower degree of bending or the weakened connection section with the groove will be disconnected first. At the same time, the weakened connection part of the FPC component and the connection section of the wire will be disconnected. At this time, the electrical signal of the FPC component will change immediately. The battery management system will collect the signal change, identify the fracture abnormality and the fracture location, and can immediately issue an expansion force warning.

[0023] Secondly, this application provides an electrical device, including the battery device described in the above embodiments.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of a battery device according to an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the cooperation between a battery cell and an FPC assembly according to an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the interaction between the FPC component and the busbar according to an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the signal acquisition unit according to an embodiment of this application.

[0031] Figure label:

[0032] FPC component 100,

[0033] FPC body 10,

[0034] Signal acquisition unit 20, substrate 21, first plate segment 211, second plate segment 212, connecting plate segment 213, cutout portion 214, weakened connection portion 215, wire 22, first wire segment 221, second wire segment 222, connecting segment 223, first transmission end 224, second transmission end 225, current sensor 226.

[0035] Battery device 200,

[0036] Battery cell assembly 300, first battery cell 301, second battery cell 302, busbar 303, first connecting end 3031, second connecting end 3032, connecting part 3033, conventional connecting section 30331, and weakened connecting section 30332.

[0037] Electrical equipment: 400; controller: 500; motor: 600; enclosure: 700.

[0038] First direction X. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0041] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0044] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0046] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0047] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0048] In this application, "multiple" means two or more (including two).

[0049] Currently, battery devices are being used more and more widely. They are not only applied in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment, aerospace, and many other fields. As the application areas of batteries continue to expand, market demand is also constantly increasing.

[0050] A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0051] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0052] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar (e.g., a busbar).

[0053] In some embodiments, multiple battery cells can be combined to form a battery cell, that is, when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery cell.

[0054] In some embodiments, the battery device includes a housing and battery cells, with at least one battery cell or at least one battery unit housed in the housing, the housing having a receiving space, and at least one battery cell or at least one battery unit housed in the receiving space.

[0055] In some embodiments, the battery device or battery cell may be part of an energy storage system. The energy storage system may be an energy storage container, an energy storage cabinet, etc., which integrates batteries and an energy shutdown module.

[0056] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate, and other performance parameters. In addition, battery safety performance also needs to be considered.

[0057] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0058] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0059] For ease of explanation, the following embodiments use electrical equipment (vehicles as an example) for illustration.

[0060] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an electrical device 400 provided in some embodiments of this application. A battery device 200 is installed inside the vehicle, and the battery device 200 may be located at the bottom, front, or rear of the vehicle. The battery device 200 can be used to power the vehicle; for example, the battery can serve as the vehicle's operating power source.

[0061] The vehicle may also include a controller 500 and a motor 600. The controller 500 controls the battery device 200 to supply power to the motor 600, which serves as a load, for example, to meet the power requirements of the vehicle during starting, navigation, and driving.

[0062] In some embodiments of this application, the battery device 200 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0063] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a housing 700 provided for some embodiments of this application. The battery device 200 includes a battery cell assembly 300 and a housing 700. The housing 700 is used to house the battery cell assembly 300. The battery cell assembly 300 may include at least one row of battery cells, and each row of battery cells includes at least two battery cells.

[0064] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes; there are no particular limitations in this application.

[0065] In the battery device 200, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel configurations. Alternatively, multiple battery cells can first be connected in series, in parallel, or in a mixed configuration to form a battery unit, and then multiple battery units can be connected in series, in parallel, or in a mixed configuration to form a whole, which is housed within the housing 700.

[0066] like Figure 3 As shown, the battery device 200 contains an FPC assembly 100. The main function of the FPC assembly 100 in the battery device 200 is to connect the sensors, battery cells, and control units in the battery management system (BMS) to realize signal transmission, power distribution, and data acquisition. The lightweight and flexible design of the FPC can adapt to complex geometric structures within the limited internal space of the battery, while reducing the overall weight.

[0067] Among them, signal transmission refers to the ability to transmit real-time data such as voltage, temperature, and current of individual battery cells, enabling the battery management system to accurately monitor the status of individual battery cells; power distribution refers to the ability to provide stable power to sensors and other electronic components; and data acquisition refers to the ability to connect multiple individual battery cells and sensors, and centrally transmit the data to the battery management system, thereby achieving precise management of the battery device 200.

[0068] In the prior art, although the FPC module 100 can achieve the above functions and its own flexibility can disperse the stress generated by the volume change of the battery cell during charging and discharging, thus improving stress concentration, it cannot provide early warning of the expansion of the battery cell. When the expansion force is too large, the FPC module 100 will break and fail as a whole, and it cannot provide early warning of expansion failure, which will also increase maintenance costs.

[0069] In view of this, the present invention provides an FPC component 100 that can cause the signal acquisition unit 20 to break when the expansion displacement of the battery cell reaches the displacement threshold, so as to generate an early warning signal, realize early warning of expansion failure, improve the safety and reliability of the battery device 200, and reduce safety hazards.

[0070] The following is for reference. Figures 1-5 This application describes an FPC component 100, a battery device 200, and an electrical appliance 400 according to embodiments thereof.

[0071] Combination Figure 2 and Figure 3 As shown, this application provides a battery device 200, including: a battery cell assembly 300 and an FPC assembly 100. The battery cell assembly 300 includes at least one battery cell row, and the battery cell row includes at least two battery cells arranged sequentially along a first direction. One of two adjacent battery cells in the first direction is defined as a first battery cell 301 and the other is a second battery cell 302.

[0072] Specifically, in a row of two adjacent battery cells, the first one in the first direction is the first battery cell 301, and the second one is the second battery cell 302. The first transmission end 224 is located on the first battery cell 301, and the second transmission end 225 is located on the second battery cell 302. The connecting segment 223 connects the first transmission end 224 and the second transmission end 225, and the connecting segment 223 can simultaneously weaken the breakage of the connecting part 215 to achieve expansion warning.

[0073] like Figure 3 , Figure 4 as well as Figure 5As shown, the FPC component 100 includes: an FPC body 10 and a signal acquisition unit 20. There are multiple signal acquisition units 20, each of which is set to a pair of adjacent battery cells and is used to acquire real-time data (such as voltage signal, current signal and temperature signal) of one of the battery cells.

[0074] The signal acquisition unit 20 is electrically connected to the FPC body 10, thereby transmitting real-time data of the battery cells to the FPC body 10, and further transmitting it to the battery management system through the FPC body 10.

[0075] Specifically, the signal acquisition unit 20 includes a first transmission end 224 disposed on the first battery cell 301, a second transmission end 225 disposed on the second battery cell 302, and a weakening connection part 215 for disconnecting the electrical connection between the first transmission end 224 and the second transmission end 225. The first transmission end 224 and the second transmission end 225 are electrically connected. The first battery cell 301 and the second battery cell 302 are disposed opposite each other in a first direction. The first transmission end 224 and the second transmission end 225 are opposite each other in the first direction. The weakening connection part 215 is adapted to break when the first battery cell 301 and the second battery cell 302 expand and the displacement generated in the first direction exceeds the displacement threshold, thereby disconnecting the first transmission end 224 and the second transmission end 225.

[0076] It should be noted that the electrical connection between the first transmission end 224 and the second transmission end 225 allows the signal acquisition unit 20 to form a signal transmission circuit or a signal acquisition circuit, and signals such as voltage signals, current signals, and temperature signals can be transmitted through the signal transmission circuit. However, during the charging and discharging process of the first battery cell 301 and the second battery cell 302, the first battery cell 301 and the second battery cell 302 expand and undergo volume changes. This causes the dimensions of the first battery cell 301 and the second battery cell 302 to increase in the first direction, which pulls on the signal acquisition unit 20, causing the first transmission end 224 and the second transmission end 225 to be opposite each other and electrically connected in the first direction, weakening the flexibility of the connection part 215. The toughness is less than the flexibility of other areas of the signal acquisition unit 20. When the expansion force of the first battery cell 301 and the second battery cell 302 pulls the weakened connection 215 and the displacement in the first direction exceeds the displacement threshold, the weakened connection 215 will break. At the same time, the electrical connection between the first transmission end 224 and the second transmission end 225 can be disconnected, thereby interrupting the signal transmission circuit inside the signal acquisition unit 20 or disconnecting the signal acquisition circuit. The corresponding battery management system will not be able to obtain the signal transmitted by the corresponding signal transmission circuit. Further calibration can be performed in the battery management system. The calibration is that when the signal transmission circuit between a group of battery cells is interrupted, the expansion force of the battery cell will soon exceed the safety threshold of the expansion change, so as to realize the expansion warning of the battery cell.

[0077] In other words, the displacement threshold at which the weakened connection portion 215 breaks in this application should be less than the safety threshold for the amount of expansion change in the first battery cell 301 and the second battery cell 302 in the first direction caused by the expansion force of the battery cell.

[0078] The circuit formed by the electrical connection of the first transmission end 224 and the second transmission end 225 can be a signal acquisition circuit. When the signal acquisition circuit is disconnected, the corresponding signal cannot be acquired. The circuit formed by the electrical connection of the first transmission end 224 and the second transmission end 225 can also be a signal transmission circuit. When the signal transmission circuit is disconnected, the corresponding signal cannot be transmitted. Both of these can prevent the battery management system from acquiring the corresponding signal, thus forming an expansion warning mechanism.

[0079] It is understandable that by setting the weakened connection part 215 in the signal acquisition part 20, the FPC component 100 can be integrated with an expansion warning function to enrich the functions of the FPC component 100. At the same time, it can provide timely expansion warning. The early warning mechanism can not only reduce the safety hazards of the battery device 200, but also prevent the FPC body 10 from breaking, and reduce maintenance costs.

[0080] According to the battery device 200 of the present application embodiment, by providing a weakened connection part 215 in the signal acquisition part 20, the signal transmission circuit can be disconnected through the weakened connection part 215 to issue an early warning that the expansion force exceeds the safety threshold. This can realize expansion warning, improve the safety of the battery device 200, and reduce safety hazards. It can not only enrich the functions of the FPC component 100 to reduce the safety hazards of the battery device 200, but also provide early warning to avoid the FPC body from breaking. In subsequent maintenance, only the signal acquisition part 20 needs to be replaced, which can also reduce maintenance costs.

[0081] like Figure 5 As shown, according to some embodiments of this application, the signal acquisition unit 20 includes: a substrate 21 and a wire 22 disposed on the substrate 21. The wire 22 is electrically connected to the FPC body 10. The substrate 21 defines a weakened connection portion 215. The wire 22 is stacked on the weakened connection portion 215 and is adapted to break synchronously with the weakened connection portion 215.

[0082] The substrate 21 provides support for the wires 22 and has a certain degree of flexibility, allowing bending and folding, and can achieve insulation between the lines. The substrate 21 can be made of materials such as polytetrafluoroethylene, polyetheretherketone, and polyimide. The wires 22 can be fixed to the substrate 21 with adhesive. The wires 22 are connected to the FPC body 10. The substrate 21 can be provided with multiple wires 22. Some of the wires 22 are used for power supply to sensors (such as temperature sensors), some of the wires 22 are used for the acquisition of voltage signals, current signals, etc., and some of the wires 22 are used for signal transmission. That is, at least one wire 22 on the substrate 21 can form a signal transmission loop and at least one wire 22 can form a signal acquisition loop. A weakened connection portion 215 is provided on the substrate 21. At least part of the wires 22 used to form the signal transmission loop or signal acquisition loop is stacked on the weakened connection portion 215 so that when the weakened connection portion 215 breaks, the wires 22 located on the weakened connection portion 215 will break simultaneously to achieve expansion warning.

[0083] In this way, under the premise of achieving expansion warning, the weakened connection part 215 is formed on the substrate 21 instead of on the wire 22, which can also ensure the reliability and stability of the signal transmission circuit or signal acquisition circuit where the wire 22 is located, thereby improving the reliability and stability of the FPC component 100.

[0084] Combination Figure 3 and Figure 5As shown, according to some embodiments of this application, the substrate 21 includes: a first plate segment 211 covering the first battery cell 301, a second plate segment 212 covering the second battery cell 302, and a connecting plate segment 213. The connecting plate segment 213 is located between the first plate segment 211 and the second plate segment 212, and a hollow portion 214 is provided on the connecting plate segment 213 to define a weakened connection portion 215.

[0085] In other words, the connecting plate segment 213 is used to connect the first plate segment 211 and the second plate segment 212, and a hollow portion 214 can be provided on the connecting plate segment 213 so that at least a part of the connecting plate segment 213 can be formed as a weakened connection portion 215. The width of the weakened connection portion 215 is smaller than the width of the other parts of the connecting plate segment 213 so that the weakened connection portion 215 can break first, so that when the weakened connection portion 215 breaks, the wire 22 located thereon breaks simultaneously.

[0086] In this way, by providing a hollow portion 214 on the connecting plate segment 213 and thereby forming a weakened connecting portion 215, the weakened connecting portion 215 can be formed with a simple structure, which can simplify the structure of the substrate 21, reduce material costs, and improve the reliability of the weakened connecting portion 215 in preventing preferential breakage.

[0087] like Figure 5 As shown, according to some embodiments of this application, the conductor 22 includes: a first conductor segment 221, a second conductor segment 222, and a connecting segment 223. One end of the first conductor segment 221 is electrically connected to the FPC body 10, and the other end extends to the first board segment 211 and forms a first transmission end 224. One end of the second conductor segment 222 is electrically connected to the FPC body 10, and the other end extends to the second board segment 212 and forms a second transmission end 225. The connecting segment 223 is stacked on the weakened connection portion 215, and one end is connected to the first transmission end 224, and the other end is connected to the second transmission end 225.

[0088] Specifically, the first conductor segment 221, the connecting segment 223, and the second conductor segment 222 form a complete signal transmission circuit or signal acquisition circuit. The connecting segment 223 is stacked on the weakening connection part 215 so that it can simultaneously weaken the breakage of the connection part 215, thereby improving the reliability and stability of the expansion warning of the signal acquisition part 20.

[0089] It should be noted that in some embodiments, the wire diameter of the connecting segment 223 may be smaller than that of the first conductor segment 221 and the second conductor segment 222, or the connecting segment 223 may be made of a different material with less toughness than the first conductor segment 221 and the second conductor segment 222.

[0090] According to some embodiments of this application, the width of the weakened connection portion 215 is greater than or equal to the wire diameter of the conductor 22.

[0091] The wire diameter of conductor 22 refers to the diameter of conductor 22 when the cross-sectional shape of conductor 22 is circular, and the maximum width dimension of the cross-sectional profile of conductor 22 when the cross-section of conductor 22 is other shapes.

[0092] Furthermore, combined with Figure 5 As shown, this application makes the width of the weakened connection portion 215 greater than or equal to the wire diameter of the conductor 22, which can improve the synchronous breakage effect of the weakened connection portion 215 and the connection segment 223, and reduce the probability that the weakened connection portion 215 does not break while the connection segment 223 breaks first, thereby improving the reliability and stability of the expansion warning of the signal acquisition unit 20.

[0093] like Figure 3 and Figure 4 As shown, according to some embodiments of this application, the battery cell assembly 300 further includes: a busbar 303, which includes a first connection terminal 3031 and a second connection terminal 3032. The first connection terminal 3031 is electrically connected to the first battery cell 301, and the second connection terminal 3032 is electrically connected to the second battery cell 302. A first transmission terminal 224 is located on the first connection terminal 3031, and a second transmission terminal 225 is located on the second connection terminal 3032.

[0094] Specifically, the busbar 303 is used to electrically connect the first battery cell 301 and the second battery cell 302. The first connection end 3031 and the second connection end 3032 are arranged opposite to each other. The first transmission end 224 and the first plate segment 211 are arranged on the first connection end 3031, and the second plate segment 212 and the second transmission end 225 are arranged on the second connection end 3032. When the first battery cell 301 and the second battery cell 302 expand, the busbar 303 will move synchronously. The first connection end 3031 can drive the first transmission end 224 and the first plate segment 211 to move, and the second connection end 3032 can drive the second transmission end 225 and the second plate segment 212 to move, so as to pull and weaken the connection part 215 and the connection segment 223, causing the connection segment 223 to break, thereby realizing an expansion warning.

[0095] In this way, on the one hand, the signal acquisition unit 20 can be set on the busbar 303 to facilitate signal acquisition by the signal acquisition unit 20. On the other hand, the first connection end 3031 and the second connection end 3032 of the busbar 303 are respectively fixed on the poles of the first battery cell 301 and the second battery cell 302, so as to move synchronously with the first battery cell 301 and the second battery cell 302, respectively. Correspondingly, they can drive the first transmission end 224 and the second transmission end 225 to move. The expansion warning of the signal acquisition unit 20 can be linked with the movement of the busbar 303, and the reliability and stability are higher.

[0096] According to some embodiments of this application, the busbar 303 further includes a connecting portion 3033 that connects the first connecting end 3031 and the second connecting end 3032, the connecting portion 3033 being located between the first connecting end 3031 and the second connecting end 3032, and a weakening connecting portion 215 being stacked on the connecting portion 3033.

[0097] It is understandable that the connecting portion 3033 is arc-shaped relative to the first connecting end 3031 and the second connecting end 3032, defining the busbar surface. For example, it may be an arc-shaped indentation facing the battery cell or an arc-shaped indentation away from the battery cell. The size of the indented portion of the connecting portion 3033 can gradually move towards the busbar surface when the battery cell expands, so as to absorb the expansion amount and prevent the busbar 303 from breaking. The weakened connecting portion 215 is directly stacked on the connecting portion 3033, which can make the reliability of the weakened connecting portion 215 breaking first more reliable, and the stability and reliability of the expansion warning more reliable.

[0098] like Figure 4 As shown, according to some embodiments of this application, the connecting portion 3033 includes: a conventional connecting segment 30331 and a weakened connecting segment 30332, the weakened connecting portion 215 is stacked with the weakened connecting segment 30332, and is adapted to break when the weakened connecting segment 30332 breaks.

[0099] Therefore, the weakened connecting section 30332 of the busbar 303 can break before the conventional connecting section 30331, and when the weakened connecting section 30332 breaks, it will simultaneously drive the weakened connecting part 215 to break, so as to realize the linkage expansion warning between the busbar 303 and the signal acquisition unit 20.

[0100] Understandably, the linkage expansion warning between busbar 303 and signal acquisition unit 20 can provide an early warning when expansion is about to fail safely. At this time, the conventional connection section 30331 has not broken, which can not only prevent the busbar 303 or signal acquisition unit 20 from breaking as a whole when the expansion exceeds the safety threshold.

[0101] In some embodiments, the connecting portion 3033 includes a plurality of arc-shaped connecting segments, and at least one arc-shaped connecting segment is provided with a groove to form a weakened connecting segment 30332, and the weakened connecting portion 215 is disposed on one side of the groove.

[0102] Of course, the structure of the connecting portion 3033 in this embodiment is not limited to this. In other embodiments, the first connecting end 3031 and the second connecting end 3032 define the busbar surface. The connecting portion 3033 includes a plurality of arc-shaped connecting segments. At least one arc-shaped connecting segment has a curvature relative to the busbar surface that is less than the curvature of other arc-shaped connecting segments. The arc-shaped connecting segment with a curvature less than that of other arc-shaped connecting segments is formed as a weakened connecting segment 30332.

[0103] In this way, by using different degrees of arched bending at the middle connection position of the busbar 303 and connecting them together with the weakened connection part 215 on the FPC assembly 100, when the expansion safety is about to fail, the weakened connection section 30332 with a low degree of bending or the weakened connection section 30332 with a groove will be disconnected first. At the same time, the weakened connection part 215 of the FPC assembly 100 and the connection section 223 of the wire 22 will be disconnected simultaneously. At this time, the electrical signal of the FPC assembly 100 will change immediately. The battery management system will collect the signal change, identify the fracture abnormality and the fracture location, and can immediately issue an expansion force warning.

[0104] It should be noted that the busbar 303 can be a single-layer busbar, with a connecting portion 3033 provided between the first connecting end 3031 and the second connecting end 3032. The connecting portion 3033 includes a weakened connecting section 30332 located on the width centerline of the busbar 303 and two conventional connecting sections 30331 located on both sides of the weakened connecting section 30332. The busbar 303 can also be a multi-layer busbar, constructed as a multi-layer plate stacked structure. Each plate includes a first connecting end 3031, a second connecting end 3032, and a connecting portion 3033. The connecting portion 3033 on at least one plate includes a weakened connecting section 30332 located on the width centerline of the busbar 303 and two conventional connecting sections 30331 located on both sides of the weakened connecting section 30332.

[0105] It is understood that the signal acquisition unit 20 of this application embodiment, in cooperation with the busbar 303, can issue an expansion warning in advance before the expansion of a battery cell is about to exceed the safety threshold. For battery cells of different specifications, the expansion warning requirements of battery cells of different specifications can be matched by adjusting the width of the weakened connection part 215, the width of the weakened connection section 30332, and other dimensions.

[0106] For example, taking the signal acquisition unit 20 for acquiring current signals as an example, a current sensor 226 is provided on the wire 22. The current sensor 226 can be provided on the first wire segment 221 or on the second wire segment 222. The first wire segment 221 and the second wire segment 222 are connected by the connecting segment 223 to form a signal acquisition circuit. The current signal acquired by the current sensor 226 can be transmitted to the battery management system. When the weakening connecting segment 30332 breaks, the weakening connecting part 215 and the connecting segment 223 break, the signal acquisition circuit is disconnected, and the current sensor 226 cannot acquire the current signal. The battery management system can identify the abnormal position of the FPC component 100 based on the position of the current sensor 226 that has not acquired the current signal, and can issue an expansion warning in advance.

[0107] This application provides an electrical device 400, including the battery device 200 in the above embodiment, which has the same technical effects as the battery device 200, and will not be described again here.

[0108] Other configurations and operations of the FPC component 100, battery device 200, and electrical equipment 400 according to embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: A battery cell assembly, the battery cell assembly including at least one row of battery cells, the row of battery cells including at least two battery cells arranged sequentially along a first direction; The FPC component includes an FPC body (10) and a signal acquisition unit (20). The signal acquisition unit (20) is electrically connected to the FPC body (10). The signal acquisition unit (20) includes a first transmission end (224) disposed on a first battery cell (301), a second transmission end (225) disposed on a second battery cell (302), and a weakened connection part (215) for disconnecting the electrical connection between the first transmission end (224) and the second transmission end (225). The inside of the signal acquisition unit (20) is formed as a signal transmission loop or a signal acquisition loop. In this configuration, the first battery cell (301) and the second battery cell (302) are disposed opposite each other in a first direction, the first transmission end (224) and the second transmission end (225) are opposite each other in the first direction, and the weakened connection portion (215) is adapted to break and disconnect the first transmission end (224) and the second transmission end (225) when the first battery cell (301) and the second battery cell (302) expand and the displacement generated in the first direction exceeds the displacement threshold. One of two adjacent battery cells in the first direction is defined as the first battery cell (301), and the other as the second battery cell (302). The signal acquisition unit (20) includes: a substrate (21) and a wire (22) disposed on the substrate (21). The wire (22) is electrically connected to the FPC body (10), and the substrate (21) defines the weakened connection portion (215). The conductor (22) is stacked on the weakened connection portion (215) and is adapted to break synchronously with the weakened connection portion (215); the battery cell assembly includes: a busbar (303), the busbar (303) includes a first connection end (3031), a second connection end (3032) and a connection portion (3033) connecting the first connection end (3031) and the second connection end (3032), the first connection end (3031) is electrically connected to the first battery cell (301), the second connection end (3032) is electrically connected to the second battery cell (302), the first transmission end (224) is located at the first connection end (3031), the second transmission end (225) is located at the second connection end (3032), the connection portion (3033) is located between the first connection end (3031) and the second connection end (3032), and the weakened connection portion (215) is stacked on the connection portion (3033).

2. The battery device according to claim 1, characterized in that, The substrate (21) includes: a first plate segment (211) covering the first battery cell (301), a second plate segment (212) covering the second battery cell (302), and a connecting plate segment (213). The connecting plate segment (213) is located between the first plate segment (211) and the second plate segment (212). The connecting plate segment (213) is provided with a hollow portion (214) to define the weakened connecting portion (215).

3. The battery device according to claim 2, characterized in that, The conductor (22) includes: a first conductor segment (221), a second conductor segment (222), and a connecting segment (223). One end of the first conductor segment (221) is electrically connected to the FPC body (10), and the other end extends to the first board segment (211) and forms the first transmission end (224). One end of the second conductor segment (222) is electrically connected to the FPC body (10), and the other end extends to the second board segment (212) and forms the second transmission end (225). The connecting segment (223) is stacked on the weakened connection portion (215), and one end is connected to the first transmission end (224), and the other end is connected to the second transmission end (225).

4. The battery device according to any one of claims 1-3, characterized in that, The width of the weakened connection (215) is greater than or equal to the diameter of the conductor (22).

5. The battery device according to claim 1, characterized in that, The connecting portion (3033) includes a conventional connecting segment (30331) and a weakened connecting segment (30332), wherein the weakened connecting portion (215) is superimposed on the weakened connecting segment (30332) and is adapted to break when the weakened connecting segment (30332) breaks.

6. The battery device according to claim 5, characterized in that, The connecting portion (3033) includes a plurality of arc-shaped connecting segments, and at least one of the arc-shaped connecting segments is provided with a groove to form the weakened connecting segment (30332), and the weakened connecting portion (215) is provided on one side of the groove.

7. The battery device according to claim 5, characterized in that, The first connecting end (3031) and the second connecting end (3032) define the busbar surface. The connecting portion (3033) includes a plurality of arc-shaped connecting segments. At least one of the arc-shaped connecting segments has a curvature relative to the busbar surface that is less than the curvature of the other arc-shaped connecting segments. The arc-shaped connecting segment with a curvature less than the other arc-shaped connecting segments is formed as the weakened connecting segment (30332).

8. An electrical appliance, characterized in that, include: The battery device as described in any one of claims 1-7.

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