Fuse, battery device, electric device and energy storage device

Abstract

The utility model discloses a fuse, a battery device, a power utilization device and an energy storage device, and the fuse comprises a housing which defines a first cavity and a second cavity which are arranged at an interval; the circuit board is arranged in the first cavity and is provided with a trigger circuit; the conductor piece is arranged in the second cavity; the breaking device is arranged in the first cavity; the multiple gas generators are arranged in the first cavity and connected to the trigger circuit in parallel, and the trigger circuit is configured to be suitable for triggering the gas generators so that the gas generators can drive the breaking device to move to cut off the conductor piece. According to the technical scheme, the fuse is provided with the plurality of gas generators, and the plurality of gas generators are connected in parallel and are connected into the trigger circuit, so that the plurality of gas generators can be triggered at the same time, the driving force to the breaking device is increased, the response speed of the fuse to loop cutting is improved, and the service life of the fuse is prolonged. And the risk that the loop cannot be effectively disconnected due to failure of the gas generator can be remarkably reduced, and the reliability of disconnecting the loop by the fuse is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuses, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] In the process of power system operation, short-circuit fault is an abnormal situation with great harm, which may cause equipment damage, fire and even threaten personnel safety. In order to protect the safety of the system, the fuse becomes the key equipment to protect the circuit under short-circuit condition. Its principle is to quickly act through MGG (micro gas generator) when short-circuit occurs, to push the related components to disconnect the circuit, thereby cutting off the fault current.

[0003] At present, in the related technology, the failure risk of the micro gas generator of the fuse is relatively high, which seriously affects the stability and reliability of the power system, therefore, the reliability of the fuse in cutting off the fault current under short-circuit condition needs to be further improved. CONTENT OF THE INVENTION

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a fuse, and a battery device, a power utilization device and an energy storage device comprising the fuse, which can improve the reliability of the fuse in disconnecting the circuit.

[0005] In a first aspect, embodiments of the present application provide a fuse, comprising: a housing defining a first cavity and a second cavity arranged at intervals; a circuit board provided in the first cavity and having a trigger circuit; a conductor provided in the second cavity; a breaking device provided in the first cavity; a plurality of gas generators provided in the first cavity, the plurality of gas generators being connected in parallel to the trigger circuit, the trigger circuit being configured to trigger the gas generators so that the gas generators drive the breaking device to move to cut off the conductor.

[0006] In the above technical solution, since the fuse is provided with a plurality of gas generators, and the plurality of gas generators are connected in parallel and connected to the trigger circuit, thereby, the plurality of gas generators can be triggered at the same time, the pushing force on the breaking device is increased, the response speed of the fuse in cutting off the circuit is improved, and the risk of failing to effectively disconnect the circuit due to the failure of the gas generator is significantly reduced, and the reliability of the fuse in disconnecting the circuit is improved.

[0007] In some embodiments, the fuse further comprises: a signal fuse body connected in series with the conductor, the signal fuse body being configured to generate an arc signal when fused; the trigger circuit comprises: a transformer and a rectifier, a primary of the transformer being configured to receive the arc signal, a secondary of the transformer being electrically connected to the heating resistors of the gas generators through the rectifier, the heating resistors of the plurality of gas generators being connected in parallel across the rectifier.

[0008] In the technical solution, the arc signal generated by the signal melt can quickly trigger the gas generator to work, improve the response speed of the fuse, effectively protect the downstream equipment from damage caused by excessive current, and reduce the probability of false triggering and improve the stability of the circuit operation by using the trigger circuit composed of the transformer and the rectifier.

[0009] In some embodiments, the resistances of the heating resistors of the plurality of gas generators are the same, or the resistances of the heating resistors of at least two gas generators are different.

[0010] In the technical solution, the resistances of the heating resistors of the plurality of gas generators are the same, which can achieve synchronous triggering of the plurality of gas generators and jointly push the breaking device to cut off the conductor, thereby improving the cutting efficiency of the circuit. The resistances of the heating resistors of at least two gas generators are different, which can trigger the plurality of gas generators in different time periods and levels, achieve gradient control of the triggering of the plurality of gas generators, and further achieve the requirement of gradually pushing the breaking device to cut off the conductor.

[0011] In some embodiments, the number of gas generators is two.

[0012] In the technical solution, by setting two gas generators, the risk of failure of the fuse can be significantly reduced without increasing the number of gas generators, thereby effectively controlling the cost of the fuse and improving the reliability of the fuse in cutting off the circuit.

[0013] In some embodiments, the trigger circuit further comprises an external interface end, and the two ends of the heating resistor of the gas generator are adapted to be electrically connected to the control power source through the external interface end.

[0014] In the technical solution, the external interface end is provided for connecting the control power source, and the battery device or the power utilization device can control whether the external interface end is conductive to the control power source to control the active cutting-off circuit, thereby effectively protecting the circuit and achieving the triggering requirement of the fuse in response to the external signal and achieving the active cutting-off circuit.

[0015] In some embodiments, a part of the plurality of heating resistors is a first resistance and another part of the plurality of heating resistors is a second resistance, a first diode is connected in series between the second resistance and the positive terminal of the external interface end, and the cathode of the first diode is connected to the positive terminal of the external interface end.

[0016] In the technical scheme, when the external control signal is received, the first diode can make the control power source not conduct with the second resistor, at this time, the control power source only conducts with the first resistor to make the first resistor heat, so that the gas generator with the first resistor can be triggered only, the conductor is cut off by the breaking device, and thus the loss of the gas generator can be reduced, and the maintenance cost of the fuse is reduced.

[0017] In some embodiments, a second diode is connected in series between the first resistor and the positive terminal of the external interface, the anode of the second diode is connected to the positive terminal of the external interface, and the cathode of the first diode is connected between the first resistor and the cathode of the second diode.

[0018] In the technical scheme, since the second diode is connected between the first resistor and the positive terminal of the external interface, when the external interface is connected to a reverse voltage, the second diode is in a reverse blocking state, and no current passes through the first resistor, so that the probability of mis-triggering of the gas generator can be reduced, and the reliability of the circuit protection is improved.

[0019] In some embodiments, the trigger circuit further comprises a transient voltage suppression diode, and two ends of the transient voltage suppression diode are connected to two ends of the rectifier, respectively.

[0020] In the technical scheme, by arranging the transient voltage suppression diode, the probability of damage of the rectifier and other circuit elements due to overvoltage can be reduced, voltage spikes can be effectively suppressed, the interference of voltage fluctuation on the circuit can be reduced, the operation stability of the trigger circuit and the entire system is improved, and the reliability and service life of the fuse, the battery device and the electrical device are improved.

[0021] In some embodiments, the fuse further comprises a connecting conductor, the connecting conductor is connected to the conductor through the signal fuse, and the connecting conductor is used to connect an external electrical element.

[0022] In the technical scheme, the connecting conductor can be conveniently connected to the external electrical element, so that the fuse can be easily connected to the circuit, and the normal conduction and power transmission of the circuit are ensured.

[0023] In some embodiments, the signal fuse is in a sheet shape and comprises a first plate portion, a second plate portion and a fusing portion, the first plate portion and the second plate portion are arranged at intervals along the width direction of the signal fuse and are connected to the conductor and the connecting conductor, respectively, the fusing portion is connected between the first plate portion and the second plate portion, the fusing portion comprises a plurality of narrow necks arranged at intervals along the length direction of the signal fuse, and a through hole penetrating through the signal fuse along the thickness direction of the signal fuse is defined between adjacent narrow necks.

[0024] In the technical solution, the melting portion of the signal fuse includes a plurality of narrow necks arranged at intervals, and a through hole is defined between adjacent narrow necks. When the current is overloaded, the narrow neck portion of the signal fuse rapidly heats up, and the narrow neck position is preferentially melted, thereby improving the accuracy and reliability of the melting. The through hole can increase the heat dissipation area of the melting portion, improve the heat dissipation efficiency of the melting portion during normal operation, reduce the probability of false melting caused by overheating, and improve the stability of the signal fuse during operation.

[0025] In some embodiments, in the direction from the first plate portion to the second plate portion, the cross-sectional area of the narrow neck gradually decreases and then gradually increases.

[0026] In the technical solution, by gradually decreasing and then gradually increasing the cross-sectional area of the narrow neck, when the overload current passes through the narrow neck, the middle position of the narrow neck can first reach the melting temperature, thereby reducing the melting time, achieving precise melting of the narrow neck, and reducing the probability of false melting of the narrow neck due to overheating during normal operation, thereby improving the reliability of the signal fuse.

[0027] In some embodiments, in the direction from the first plate portion to the second plate portion, the melting portion extends along an arc line protruding to one side in the thickness direction of the signal fuse.

[0028] In the technical solution, since the melting portion extends along the arc line protruding to one side, the structural strength of the melting portion can be improved, stress can be better dispersed when the signal fuse is subjected to external force impact or thermal stress change, the risk of fracture of the melting portion due to stress concentration can be reduced, the surface area of the melting portion can be increased, the heat dissipation area of the melting portion during normal operation can be improved, the temperature distribution of the signal fuse can be more uniform, the probability of local overheating can be reduced, thereby reducing the probability of false melting, and improving the reliability of the signal fuse during operation.

[0029] In some embodiments, the conductor member includes a first segment, a structural weak segment, and a second segment connected in sequence in the length direction of the conductor member, the structural weak segment has a structural weak area formed thereon, the gas generator is configured to be triggered to drive the breaking device to cut off the structural weak segment at the structural weak area, and the signal fuse is connected to one end of the first segment or the second segment away from the structural weak segment.

[0030] In the technical solution, by forming the structural weak area on the structural weak segment, the breaking device can accurately cut off the structural weak segment at a specific position, the reliability and consistency of the cutting can be improved, the on-off of the circuit can be accurately controlled, unnecessary damage to other parts of the conductor member can be reduced, and other faults or damages caused by the cutting process can be reduced.

[0031] In some embodiments, the shell comprises: an arc-extinguishing shell defining a second cavity open on one side in the first direction, the conductor member being arranged on the open side of the arc-extinguishing shell and partially extending into the second cavity; an assembly shell connected to the arc-extinguishing shell and located on the open side of the arc-extinguishing shell, the assembly shell defining a first cavity open on a side away from the arc-extinguishing shell in the first direction; and a cover plate covering the open side of the assembly shell.

[0032] In the above technical solution, the circuit board, the gas generator, the breaking device and the like can be conveniently arranged in the first cavity, the conductor member and the remaining components in the second cavity can be conveniently arranged in the second cavity, the assembly efficiency is improved, the assembly and maintenance efficiency of the fuse is improved, the electrical elements in the first cavity and the second cavity can be protected, the probability of dust and foreign matter entering the first cavity and the second cavity is reduced, and the reliability and service life of the fuse are improved.

[0033] In a second aspect, embodiments of the present application provide a battery device, comprising: a box body, a battery cell assembly and a fuse according to the first aspect of the present application, the battery cell assembly and the fuse being arranged in the box body, and the fuse being electrically connected with the battery cell assembly.

[0034] In the above technical solution, by arranging the fuse of the above first aspect, the fuse is provided with a plurality of gas generators connected in parallel and connected to the trigger circuit of the circuit board, so that the plurality of gas generators can be triggered at the same time, the pushing force on the breaking device is increased, the response speed of the fuse to the circuit disconnection is improved, the risk of the circuit not being effectively disconnected due to the failure of the gas generator is significantly reduced, the reliability of the fuse to disconnect the circuit is improved, and the overall performance of the battery device is improved.

[0035] In a third aspect, embodiments of the present application provide a power utilization device, comprising the battery device according to the second aspect of the present application.

[0036] In the above technical solution, since the power utilization device is provided with the above battery device, the overall performance of the power utilization device is improved.

[0037] In a fourth aspect, embodiments of the present application provide an energy storage device, comprising the battery device according to the second aspect of the present application.

[0038] In the above embodiment, by arranging the battery device of the above second aspect, the overall performance of the energy storage device is improved.

[0039] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1is a schematic view of a vehicle according to an embodiment of the present application;

[0041] Figure 2 is an exploded view of a battery device according to an embodiment of the present application;

[0042] Figure 3 is an exploded view of a fuse according to an embodiment of the present application;

[0043] Figure 4 is a structural schematic view of a trigger circuit on a circuit board of a fuse according to an embodiment of the present application;

[0044] Figure 5 is a structural schematic view of a signal fuse of a fuse according to an embodiment of the present application;

[0045] Figure 6 is a structural schematic view of a conductor member of a fuse according to an embodiment of the present application.

[0046] Reference Signs:

[0047] 1, an electric device;

[0048] 1000, a battery device; 2000, a controller; 3000, a motor;

[0049] 300, a battery cell; 200, a case; 210, a first case; 220, a second case;

[0050] 100, a fuse;

[0051] 101, a first cavity; 11, an arc extinguishing shell; 12, an assembling shell; 13, a cover plate;

[0052] 20, a circuit board;

[0053] 30, a conductor member; 31, a first section; 32, a structurally weak section; 33, a second section;

[0054] 40, a breaking device; 50, a gas generator;

[0055] 60, a signal fuse; 61, a first plate portion; 62, a second plate portion; 63, a fuse portion; 631, a narrow neck; 632, a perforation;

[0056] 70, a connecting conductor;

[0057] T1, a transformer; D, a rectifier; R1, a first resistor; R2, a second resistor; D1, a first diode; D2, a second diode; TVS1, a transient voltage suppression diode; F1, an external interface terminal;

[0058] Z, a first direction; Y, a second direction; X, a third direction. DETAILED DESCRIPTION

[0059] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0062] In this paper, "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two).

[0065] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] In the operation process of the power system, short-circuit fault is an abnormal situation with great harm, which can cause equipment damage, fire and even threaten personnel safety. In order to protect the safety of the system, the fuse becomes the key equipment to protect the circuit under short-circuit condition. Its principle is to quickly act through MGG (micro gas generator) when short-circuit occurs, to push the related components to disconnect the circuit, thereby cutting off the fault current.

[0068] However, in the related art, the failure risk of the micro gas generator of the fuse is relatively high, which seriously affects the stability and reliability of the power system, and therefore, the reliability of the fuse in cutting off the fault current under short-circuit condition needs to be further improved.

[0069] Based on the above consideration, in order to improve the reliability of the fuse in cutting off the short-circuit current, the present application designs a fuse, which includes a plurality of gas generators, and the plurality of gas generators are connected in parallel and then connected to the trigger circuit of the fuse. When the external trigger signal is connected to the trigger circuit, the plurality of gas generators can be triggered at the same time. When the plurality of gas generators are triggered at the same time, the pushing force on the breaking device can be increased, the cutting efficiency on the conductor piece can be improved, and the response speed of the fuse in cutting off the circuit can be improved. If one or part of the plurality of gas generators fails, the unfailed gas generator can still be triggered to push the cutting device to cut off the conductor piece, so that there is always a gas generator in the fuse that can be triggered to push the cutting device to cut off the conductor piece, thereby realizing reliable cutting off of the circuit.

[0070] The embodiments of the present application provide a battery device using the fuse of the present application, and a power consumption device using the battery device as a power source. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, an electric aircraft toy, etc.

[0071] The following embodiments take the electric device 1 as a vehicle for example to introduce the structure of the electric device 1, the battery device 1000 and the fuse 100 in detail.

[0072] Please refer to Figure 1 , Figure 1 The electric device 1 provided by some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The vehicle is provided with a battery device 1000, which can be arranged at the bottom, the head or the tail of the vehicle. The battery device 1000 can be used for power supply of the vehicle, for example, the battery device 1000 can be used as the operating power supply of the vehicle. The vehicle can further include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, to meet the working power demand of the vehicle during starting, navigation and driving. In some embodiments of the present application, the battery device 1000 can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0073] Please refer to Figure 2 , Figure 2 The structural explosion diagram of the battery device 1000 provided by some embodiments of the present application is shown. The battery device 1000 includes a box body 200 and a plurality of battery monomers 300, and the box body 200 is used to provide an assembly space for the battery monomers 300, and the battery monomers 300 are accommodated in the box body 200.

[0074] As an example, the box body 200 can include a first box body 210 and a second box body 220. The first box body 210 and the second box body 220 are buckled so that an enclosed space is formed inside the box body 200 to accommodate the battery monomer assembly. The enclosed space here means covered or closed, which can be sealed or unsealed. The first box body 210 can be a top cover or a bottom plate.

[0075] As an example, the box body 200 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box body 200 to accommodate the battery monomer assembly.

[0076] As an example, the box body 200 can be part of the chassis structure of the vehicle. For example, the top cover of the box body 200 can become at least part of the floor of the vehicle, or the frame of the box body 200 can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0077] The battery apparatus 1000 mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include one or more battery cells 300, and when there are multiple battery cells 300, the multiple battery cells 300 are connected in series, in parallel, or in a mixed connection through a busbar component.

[0078] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 300; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 300 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 300 with a cable tie.

[0079] In some embodiments, the battery apparatus 1000 can be a battery pack, which includes a box 200 and one or more battery cell assemblies accommodated in the box 200.

[0080] As an example, the battery cell assembly can be a battery module, which can be accommodated in the box 200 by fixing the battery module in the box 200.

[0081] As an example, the battery cell assembly can also be accommodated in the box 200 by directly fixing a plurality of battery cells 300 in the box 200.

[0082] The battery cell 300 mentioned in the embodiments of the present application can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., which is not limited by the embodiments of the present application. The battery cell 300 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., which is also not limited by the embodiments of the present application. The battery cell 300 is generally divided into three types according to the packaging method: cylindrical battery cells 300, square battery cells 300, and soft-pack battery cells 300, which is also not limited by the embodiments of the present application.

[0083] As an example, the battery cell 300 can generally include a shell, an electrode assembly, and an electrolyte, the shell being used to accommodate the electrode assembly and the electrolyte, and the shell being provided with at least one positive pole and at least one negative pole. The electrode assembly includes one or more electrode assemblies, which are formed by stacking or winding a positive pole sheet, a negative pole sheet, and a separator film.

[0084] The following refers to Figures 3-6 The fuse 100 according to the first aspect of the present application is described. Figure 3is an exploded view of a fuse 100 according to an embodiment of the present application; Figure 4 is a structural schematic view of a trigger circuit on a circuit board 20 of a fuse 100 according to an embodiment of the present application; Figure 5 is a structural schematic view of a signal fuse 60 of a fuse 100 according to an embodiment of the present application; Figure 6 is a structural schematic view of a conductor piece 30 of a fuse 100 according to an embodiment of the present application.

[0085] An embodiment of the present application provides a fuse 100, as shown in Figure 3 The fuse 100 includes a housing, a circuit board 20, a conductor piece 30, a breaking device 40 and a plurality of gas generators 50. The housing defines a first cavity 101 and a second cavity arranged in a spaced manner. The circuit board 20 is arranged in the first cavity 101 and has a trigger circuit. The conductor piece 30 is arranged in the second cavity. The breaking device 40 is arranged in the first cavity 101. The plurality of gas generators 50 are arranged in the first cavity 101 and are connected in parallel to the trigger circuit. The trigger circuit is configured to trigger the gas generators 50 to push the breaking device 40 to move to cut off the conductor piece 30.

[0086] The housing is used to provide an assembly space for the rest of the components of the fuse 100. As an example, the housing can be a ceramic piece or a plastic piece. As an example, the housing can be a one-piece or a split piece.

[0087] The housing is formed with the first cavity 101 and the second cavity, and the other components of the fuse 100 can be arranged in the first cavity 101 and the second cavity respectively. As shown in Figure 3 The first cavity 101 and the second cavity can be arranged along a first direction Z, and the first cavity 101 and the second cavity are in communication, for example, the housing is formed with a communication port, and the first cavity 101 and the second cavity are in communication through the communication port.

[0088] As shown in Figure 3 The circuit board 20, the gas generators 50 and the breaking device 40 are arranged in the first cavity 101, and the circuit board 20, the gas generators 50 and the breaking device 40 are arranged along the first direction Z. The circuit board 20 is located on a side of the gas generators 50 away from the second cavity in the first direction Z, and the breaking device 40 is located on a side of the gas generators 50 facing the second cavity in the first direction Z. The conductor piece 30 is arranged in the second cavity, and the breaking device 40 and the conductor piece 30 are opposite to each other in the first direction Z.

[0089] The gas generator 50 is configured to generate gas through a chemical reaction or a physical change. For example, the gas generator 50 is internally provided with a specific chemical agent. When an external trigger signal acts on the gas generator 50, the chemical agent rapidly reacts to generate a large amount of gas. The gas rapidly expands in a short time to form a high-pressure gas environment. The pressure of the gas is used to push the breaking device 40 to act, thereby cutting the conductor 30, so that the fuse 100 can quickly disconnect under the condition of meeting the trigger condition.

[0090] As an example, the gas generator 50 can be a pyrotechnic gas generator 50 or a gas generating agent gas generator 50. When the gas generator 50 is a pyrotechnic gas generator 50, the trigger circuit is configured to ignite the pyrotechnic agent in the gas generator 50. When the gas generator 50 is a gas generating agent gas generator 50, the trigger circuit is configured to excite the gas generating agent in the gas generator 50 to react, for example, the trigger circuit can excite the gas generating agent by heating through current flowing through the heating element, or by generating an electric spark, or by controlling the opening of a laser or strong light to irradiate the gas generating agent.

[0091] As an example, the number of gas generators 50 of the fuse 100 can be two, three, four, five, six, seven, eight, or nine or more.

[0092] “Multiple gas generators 50 are connected in parallel to the trigger circuit” means that multiple gas generators 50 are connected in parallel, and then the multiple gas generators 50 are connected as a whole to the trigger circuit. In other words, the gas generator 50 has an electrical element for igniting or exciting the agent (pyrotechnic agent or gas generating agent) to generate gas, for example, the electrical element can be an ignition element (heating element), a high-voltage electrode, a laser generator, or a strong light source, etc. The electrical elements of the multiple gas generators 50 for igniting or exciting the agent are connected in parallel first, and then connected to the trigger circuit.

[0093] When the external trigger signal is connected to the trigger circuit, the trigger circuit can ignite or excite the gas generator 50 through the electrical element connected to the trigger circuit, thereby achieving the function of quickly cutting off the circuit.

[0094] In the related art, only one gas generator 50 is provided in the fuse 100. If the gas generator 50 fails, the fuse 100 cannot cut off the circuit and cannot reliably disconnect the circuit, thereby bringing great operation risk to the battery device 1000 and the electric device 1, etc.

[0095] In the embodiment, the plurality of gas generators 50 are connected in parallel to the trigger circuit of the fuse 100, and when the external trigger signal is connected to the trigger circuit, the plurality of gas generators 50 can be triggered at the same time. When the plurality of gas generators 50 are triggered at the same time, the pushing force on the breaking device 40 can be increased, the cutting efficiency of the conductor 30 can be improved, and the response speed of the fuse 100 in cutting the circuit can be improved. If one or part of the plurality of gas generators 50 fails, the unfailed gas generators 50 can still be triggered to push the breaking device to cut the conductor 30, so that the gas generator 50 in the fuse 100 can always be triggered to push the breaking device to cut the conductor 30, and reliable cutting of the circuit is achieved.

[0096] It should be emphasized that the probability of simultaneous failure of the plurality of gas generators 50 in the fuse 100 is extremely low, and therefore the reliability of the fuse 100 in cutting the circuit can be significantly improved, and the risk of failure of the gas generator 50 in effectively cutting the circuit can be significantly reduced.

[0097] In the above technical solution, the plurality of gas generators 50 are provided in the fuse 100, and the plurality of gas generators 50 are connected in parallel to the trigger circuit, so that the plurality of gas generators 50 can be triggered at the same time, the pushing force on the breaking device 40 can be increased, the response speed of the fuse 100 in cutting the circuit can be improved, and the risk of failure of the gas generator 50 in effectively cutting the circuit can be significantly reduced, and the reliability of the fuse 100 in cutting the circuit can be improved.

[0098] Reference Figure 3 and Figure 4 In some embodiments of the present application, the fuse 100 further comprises a signal fuse 60 connected in series with the conductor 30, and the signal fuse 60 is configured to generate an arc signal when fused. The trigger circuit comprises a transformer T1 and a rectifier D, the primary of the transformer T1 is configured to receive the arc signal, the secondary of the transformer T1 is electrically connected to the heating resistor of the gas generator 50 through the rectifier D, and the heating resistors of the plurality of gas generators 50 are connected in parallel across the rectifier D.

[0099] The signal fuse 60 and the conductor 30 are connected in series in the circuit, wherein the signal fuse 60 is an electrical conductor, the signal fuse 60 has a low melting point and a high resistance value, and when a short circuit or an excessive current occurs in the circuit, the signal fuse 60 will rapidly heat up and be fused.

[0100] Exemplarily, as Figure 4As shown, the rectifier D is a bridge rectifier D, which includes four diodes connected in a bridge structure. When AC power is input, in the positive half cycle, two diodes connected to the positive pole of the power source are turned on, and the current flows through the two diodes in turn, and then flows to the two cut-off diodes connected to the negative pole of the power source through the load. In the negative half cycle, two diodes connected to the negative pole of the power source are turned on, and the current flows through the two diodes, the load, and then flows to the two cut-off diodes connected to the positive pole of the power source. In this way, consistent direct current can be obtained on the load, and the output direct current has small pulsation and high stability.

[0101] When the circuit in which the fuse 100 is located is operating normally, the current passes through the loop in which the conductor 30 and the signal fuse 60 are connected in series. At this time, the signal fuse 60 remains in a conductive state, the entire fuse 100 is in a normal working mode, and the gas generator 50 is not activated.

[0102] When a short circuit or other fault occurs in the circuit, the current passing through the signal fuse 60 increases sharply. Due to its own resistance characteristics, the signal fuse 60 rapidly heats up under the action of the excessive current. When the temperature reaches the melting point of the signal fuse 60, the signal fuse 60 melts, and an arc signal is generated at the moment of melting. Since the arc signal has a certain voltage and current, the primary of the transformer T1 is configured to receive the arc signal. The arc signal generates a varying magnetic field in the primary of the transformer T1. According to the principle of electromagnetic induction, the secondary of the transformer T1 will induce a corresponding electromotive force, thereby generating an electric signal.

[0103] The electric signal generated by the secondary of the transformer T1 passes through the rectifier D, which converts the AC electric signal into a DC electric signal, ensuring that the direction of the output current meets the working requirements of the heating resistor of the gas generator 50. The rectified DC electric signal is transmitted to the heating resistor of the gas generator 50. After the heating resistor is powered on, it generates heat, which triggers the chemical reaction of the gas generating agent or the pyrotechnic agent inside the gas generator 50, generating a large amount of gas. These gases rapidly expand in the first cavity 101 inside the housing of the fuse 100, forming a high-pressure environment and driving the breaking device 40 to act. The breaking device 40 acts on the conductor 30, causing the conductor 30 to break, thereby cutting off the entire circuit and achieving short circuit protection of the circuit.

[0104] In this embodiment, the arc signal generated by the signal fuse 60 can be captured by the transformer T1 in a very short time when the short-circuit fault occurs, and then quickly trigger the gas generator 50 to work, so as to ensure that the circuit is cut off in the shortest time, improve the response speed of the fuse 100, and effectively protect the downstream equipment from excessive current damage. At the same time, by using the trigger circuit composed of the transformer T1 and the rectifier D, the arc signal is converted into an electric signal suitable for the work of the gas generator 50. The whole triggering process is based on the mature electromagnetic induction and rectification principle, and is not affected by other interference factors, which greatly improves the reliability of the triggering of the gas generator 50.

[0105] In addition, since the signal fuse 60 is specially used for detecting short-circuit current and generating arc signal, and cooperates with the gas generator 50 and the trigger circuit, the detection and cutting action of the fuse 100 on the short-circuit fault is more accurate, the probability of false triggering is reduced, and the stability of the circuit operation is improved.

[0106] In addition, since the heating resistors of the plurality of gas generators 50 are connected in parallel across the rectifier D, the rectified direct current can be loaded across the plurality of heating resistors at the same time, so that the plurality of heating resistors heat up at the same time, and the plurality of gas generators 50 are excited to generate gas at the same time. Therefore, the pushing force on the breaking device 40 can be increased, the response speed of the fuse 100 to the circuit cutting can be improved, and the risk of the circuit not being effectively disconnected due to the failure of the gas generator 50 can be significantly reduced, and the reliability of the fuse 100 to disconnect the circuit can be improved.

[0107] In the above technical solution, the arc signal generated by the signal fuse 60 can quickly trigger the gas generator 50 to work, improve the response speed of the fuse 100, effectively protect the downstream equipment from excessive current damage, and use the trigger circuit composed of the transformer T1 and the rectifier D to reduce the probability of false triggering and improve the stability of the circuit operation.

[0108] In some embodiments of the present application, the resistance values of the heating resistors of the plurality of gas generators 50 are the same, or the resistance values of the heating resistors of at least two gas generators 50 are different.

[0109] When the resistance values of the heating resistors of the plurality of gas generators 50 are the same, if the trigger circuit receives an external signal to be triggered, since the plurality of heating resistors are connected in parallel, the current values through the plurality of heating resistors in the trigger circuit are the same, and the heat and temperature rise generated by the heating resistors are the same, so that the plurality of gas generators 50 can be triggered synchronously, and the plurality of gas generators 50 can jointly push the breaking device 40 to cut off the conductor 30, thereby improving the cutting efficiency of the circuit.

[0110] The resistance values of the heating resistors of the at least two gas generators 50 are different, which means that the resistance value of at least one heating resistor is different from the resistance values of the remaining heating resistors. For example, the resistance values of the heating resistors of the plurality of gas generators 50 are all different. In this way, when the trigger circuit access signal is triggered, the current flowing through at least one heating resistor is different, and the temperature rise speed of the heating resistor is also different from the temperature rise speeds of the remaining heating resistors, so that the corresponding gas generator 50 is triggered before or after the remaining gas generators 50, the multiple gas generators 50 are triggered in different time periods and different levels, the effect of gradient control of the multiple gas generators 50 is achieved, and the requirement of gradually pushing the breaking device 40 to cut off the conductor 30 is achieved.

[0111] In some examples, the resistance value of the heating resistor can be greater than or equal to 1Ω and less than or equal to 5Ω, for example, the resistance value of the heating resistor of any one gas generator 50 can be 1Ω, 2Ω, 3Ω, 4Ω or 5Ω, etc.

[0112] As shown in Figure 4 , the two heating resistors are a first resistor R1 and a second resistor R2, and the resistance values of the first resistor R1 and the second resistor R2 can both be 2Ω. In other examples, the resistance value of the first resistor R1 can be 2Ω, and the resistance value of the second resistor R2 can be 3Ω.

[0113] In the above technical solutions, the resistance values of the heating resistors of the plurality of gas generators 50 are the same, which can achieve that the plurality of gas generators 50 are triggered synchronously and jointly push the breaking device 40 to cut off the conductor 30, thereby improving the cutting efficiency of the loop. The resistance values of the heating resistors of the at least two gas generators 50 are different, which can make the plurality of gas generators 50 be triggered in different time periods and different levels, achieve the effect of gradient control of the multiple gas generators 50, and further achieve the requirement of gradually pushing the breaking device 40 to cut off the conductor 30.

[0114] In some embodiments of the present application, as shown in Figure 3 and Figure 4 , the number of gas generators 50 is two.

[0115] As shown in Figure 3 , the two gas generators 50 are arranged between the circuit board 20 and the breaking device 40, and the two gas generators 50 are arranged side by side along a second direction Y perpendicular to the first direction Z.

[0116] It should be noted that when the probability of failure of one gas generator 50 is a, the probability of failure of two gas generators 50 is a*a. For example, the probability of failure of one gas generator 50 is 0.2, and the probability of failure of two gas generators 50 is 0.04.

[0117] In the technical solution, by arranging two gas generators 50, the risk of failure of the fuse 100 can be significantly reduced without increasing the number of the gas generators 50, and the cost of the fuse 100 is effectively controlled, and the reliability of the fuse 100 in cutting off the circuit is improved.

[0118] In some embodiments of the present application, the triggering circuit further comprises an external interface end F1, and the two ends of the heating resistor of the gas generator 50 are adapted to be electrically connected to the control power supply through the external interface end F1.

[0119] When the control signal indicating that the fuse 100 needs to cut off the circuit is received, the control system can control the triggering circuit to be electrically connected to the control power supply through the external interface end F1, at this time, the voltage of the control power supply is applied to the two ends of the heating resistor, so that the heating resistor is powered on and heated, and the medicament in the gas generator 50 is ignited or triggered, the gas generator 50 generates gas, pushes the breaking device 40 to cut off the conductor 30, and the circuit is cut off.

[0120] In the technical solution, the battery device 1000 or the power utilization device 1 can send a control signal indicating that the circuit needs to be cut off to the control system when the battery device 1000 or the power utilization device 1 is subjected to a collision or other unexpected working conditions (for example, receiving an external signal), and the control system controls the fuse 100 to cut off the circuit.

[0121] Exemplarily, a control switch can be connected in series between the external interface end F1 and the control power supply, and the control system can control whether the heating resistor of the gas generator 50 is powered on by controlling the on-off of the control switch.

[0122] Exemplarily, the heating resistors of the plurality of gas generators 50 are adapted to be electrically connected to the control power supply through the external interface end F1. Exemplarily, only a part of the heating resistors of the plurality of gas generators 50 are adapted to be electrically connected to the control power supply through the external interface end F1.

[0123] In the technical solution, by arranging the external interface end F1 for connecting the control power supply, the battery device 1000 or the power utilization device 1 can control whether the external interface end F1 is conductive to the control power supply, so as to control the active cutting off of the circuit, and effectively protect the circuit, so as to realize the active cutting off of the circuit in response to the triggering demand of the external signal.

[0124] In some embodiments of the present application, referring to Figure 4 , a part of the plurality of heating resistors is the first resistor R1, and another part of the plurality of heating resistors is the second resistor R2, a first diode D1 is connected in series between the second resistor R2 and the positive terminal of the external interface end F1, and the cathode of the first diode D1 is connected to the positive terminal of the external interface end F1.

[0125] That is, one part of the gas generator 50 has a heating resistor of the first resistance R1, and another part of the gas generator 50 has a heating resistor of the second resistance R2, and the second resistance R2 is connected in series with the external interface end F1 through the first diode D1, and the cathode of the first diode D1 is connected to the positive terminal of the external interface end F1.

[0126] In some examples, the control power supply is a direct current power supply, and the positive terminal of the external interface end F1 is used to connect the positive terminal of the control power supply.

[0127] In this way, when the control power supply is connected to the external interface end F1, since the second resistance R2 is connected in series with the first diode D1, and the first diode D1 is in a reverse bias state, i.e., the first diode D1 is in a reverse blocking state, therefore, there is almost no current passing through the second resistance R2 and the first diode D1 connected in series, so that the heating of the second resistance R2 cannot be realized, and the corresponding gas generator 50 of the second resistance R2 cannot be triggered.

[0128] At the same time, the first resistance R1 is not connected with a diode in a reverse bias state with the external interface end F1, so that the control power supply can heat the first resistance R1 when the control power supply is connected to the external interface end F1, and then trigger the gas generator 50 corresponding to the first resistance R1.

[0129] In the above technical solution, when receiving an external control signal to cut off the circuit, the first diode D1 can make the control power supply not connected to the second resistance R2, at this time, the control power supply is only connected to the first resistance R1 to heat the first resistance R1, so that only the gas generator 50 with the first resistance R1 can be triggered to push the breaking device 40 to cut off the conductor 30, so that the loss of the gas generator 50 can be reduced, and the maintenance cost of the fuse 100 can be reduced.

[0130] In some examples, one end of the first resistance R1 is connected to the negative output terminal of the rectifier bridge, and the other end of the first resistance R1 is connected to the positive output terminal of the rectifier bridge through the first diode D1. The two ends of the second resistance R2 are directly connected to the positive output terminal and the negative output terminal of the rectifier bridge, respectively.

[0131] In some embodiments of the present application, with reference to Figure 4 , the first resistance R1 is connected in series with the positive terminal of the external interface end F1 through the second diode D2, the anode of the second diode D2 is connected to the positive terminal of the external interface end F1, and the cathode of the first diode D1 is connected between the first resistance R1 and the cathode of the second diode D2.

[0132] When the external control signal is received and the circuit needs to be cut off, the power supply is controlled to be conducted with the external interface end F1, the second diode D2 is in a forward conduction state, and the first diode D1 is in a reverse cut-off state. At this time, the first resistor R1 has current passing through, and the second resistor R2 has no current passing through, so that the gas generator 50 with the first resistor R1 can be triggered only.

[0133] In the technical solution, the second diode D2 is connected between the first resistor R1 and the positive terminal of the external interface end F1. When the external interface end F1 is connected to a reverse voltage, the second diode D2 is in a reverse cut-off state, and the first resistor R1 has no current passing through. Therefore, the probability of mis-triggering of the gas generator 50 can be reduced, and the reliability of the circuit protection can be improved.

[0134] In some embodiments of the present application, referring to Figure 4 , the trigger circuit further comprises a transient voltage suppression diode TVS1, and two ends of the transient voltage suppression diode TVS1 are connected to two ends of the rectifier D respectively.

[0135] When a transient high voltage occurs in the circuit, such as a surge voltage generated by lightning strike or switch operation, the transient voltage suppression diode TVS1 can quickly change from a high resistance state to a low resistance state to clamp the excessively high voltage at a safe level.

[0136] In the technical solution, by arranging the transient voltage suppression diode TVS1, the probability of damage of the circuit components such as the rectifier D due to excessively high voltage can be reduced, voltage spikes can be effectively suppressed, voltage fluctuations can be reduced, the running stability of the trigger circuit and the entire system can be improved, and the reliability and service life of the fuse 100, the battery device 1000 and the electrical device 1 can be improved.

[0137] In some examples, the conductor 30 is a copper bar.

[0138] In some embodiments of the present application, as shown in Figure 3 , the fuse 100 further comprises a connecting conductor 70, the connecting conductor 70 is connected to the conductor 30 through the signal fuse 60, and the connecting conductor 70 is used to connect external electrical components.

[0139] In some examples, the connecting conductor 70 is a copper bar, so that the conductivity of the connecting conductor 70 can be improved, and the installation and connection of the connecting conductor 70 can be facilitated.

[0140] In some examples, referring to Figure 3 , the conductor 30 and the connecting conductor 70 extend along a third direction X, the third direction X is perpendicular to the first direction Z and the second direction Y, and the conductor 30 and the connecting conductor 70 are arranged in the third direction X. The conductor 30 and the connecting conductor 70 are electrically connected through the signal fuse 60.

[0141] Specifically, the conductor 30 and the connecting conductor 70 are both copper bars, the thickness direction of the copper bars is along the first direction Z, one of the conductor 30 and the connecting conductor 70 is provided with a protruding portion extending along the third direction X, and the other is formed with a groove recessed along the third direction X, the protruding portion is matched in the groove, and the protruding portion and the inner wall of the groove are matched in clearance, the signal fuse 60 is arranged on one side of the connecting conductor 70 and the conductor 30 in the thickness direction (the third direction X), the signal fuse 60 extends along the second direction Y to be long strip-shaped, and the two side edges of the signal fuse 60 along the third direction X are connected with the conductor 30 and the connecting conductor 70 respectively. For example, the signal fuse 60 can be connected with the connecting conductor 70 and the conductor 30 by welding or through conductive glue.

[0142] In the above technical solution, the connecting conductor 70 can be conveniently connected with external electrical components, so that the fuse 100 can be easily connected to the circuit, and the normal conduction and power transmission of the circuit are ensured.

[0143] In some embodiments of the present application, the signal fuse 60 is in a sheet shape and includes a first plate portion 61, a second plate portion 62, and a fusing portion 63, the first plate portion 61 and the second plate portion 62 are arranged in intervals along the width direction (for example, the third direction X shown in the Figure 5 above) of the signal fuse 60, and are connected with the conductor 30 and the connecting conductor 70 respectively, the fusing portion 63 is connected between the first plate portion 61 and the second plate portion 62, and the fusing portion 63 includes a plurality of narrow necks 631 arranged in intervals along the length direction (for example, the second direction Y shown in the Figure 5 above) of the signal fuse 60, and the adjacent narrow necks 631 define a through hole 632 penetrating the signal fuse 60 along the thickness direction (for example, the first direction Z shown in the Figure 5 above) of the signal fuse 60.

[0144] The signal fuse 60 is in a sheet shape, which means that the signal fuse 60 is in a flat and thin sheet structure. The sheet-shaped signal fuse 60 can increase the heat dissipation area of the signal fuse 60, so that the temperature of the signal fuse 60 is more stable during normal operation. At the same time, the sheet-shaped signal fuse 60 can realize precise control of the fusing characteristics of the signal fuse 60, and can quickly fuse when the current is abnormal, effectively play the signal indicating role, and timely feedback the circuit fault.

[0145] The fusing portion 63 includes a plurality of narrow necks 631, and specifically, the number of the narrow necks 631 of the fusing portion 63 can be two, three, four, five, six, eight, ten, fifteen or more. When the current is abnormal, the narrow neck 631 part will heat up quickly, improve the fusing speed, quickly cut off the circuit, and protect the equipment.

[0146] The perforation 632 defined between adjacent narrow necks 631 can increase the heat dissipation area of ​​the fuse part 63 or the signal fuse 60, which helps to effectively dissipate the heat generated by the signal fuse 60 when the signal fuse 60 is working normally, reduce the probability of the signal fuse 60 being falsely melted due to overheating, and improve the stability of the signal fuse 60.

[0147] In some examples, both the first plate portion 61 and the second plate portion 62 are flat and arranged in the third direction X. The first plate portion 61 is connected to the conductor 30, and the second plate portion 62 is connected to the connecting conductor 70. For example, the first plate portion 61 is attached to one surface of the conductor 30 in the thickness direction, and the second plate portion 62 is attached to one surface of the connecting conductor 70 in the thickness direction. Alternatively, the first plate portion 61 is welded to the conductor 30, and the second plate portion 62 is welded to the connecting conductor 70.

[0148] In the above technical solution, since the fuse portion 63 of the signal fuse 60 includes a plurality of spaced necks 631, and a through hole 632 is defined between adjacent necks 631, the necks 631 of the signal fuse 60 will heat up rapidly when the current is overloaded, causing the necks 631 to melt first, thereby improving the accuracy and reliability of the fuse. The through hole 632 can increase the heat dissipation area of ​​the fuse portion 63, improve the heat dissipation efficiency of the fuse portion 63 during normal operation, reduce the probability of false melting due to overheating, and improve the stability of the signal fuse 60.

[0149] In some embodiments of this application, such as Figure 5 As shown, in the direction from the first plate portion 61 toward the second plate portion 62, the cross-sectional area of ​​the narrow neck 631 first gradually decreases and then gradually increases.

[0150] like Figure 5 As shown, the cross-sectional area of ​​the neck 631 is smallest at the middle in the third direction X, and gradually increases from the middle to both ends. Since the resistance is inversely proportional to the cross-sectional area, the resistance and heat generation of the neck 631 are greatest at the middle position. When an overload current passes through the neck 631, the middle position of the neck 631 can reach the melting temperature first. Therefore, by controlling the cross-sectional area of ​​the middle part of the neck 631, the precise melting of the neck 631 can be achieved, the melting time can be reduced, and the protection effect of the circuit can be improved.

[0151] In addition, as the cross-sectional area of ​​the two ends of the narrow neck 631 gradually increases, when the signal fuse 60 is working normally, the heat in the middle of the narrow neck 631 can be quickly transferred to the first plate 61 and the second plate 62 through the two ends of the narrow neck 631, reducing the probability of the narrow neck 631 melting due to local overheating and improving the reliability of the signal fuse 60.

[0152] In the technical solution, the cross-sectional area of the narrow neck 631 is gradually reduced and then gradually increased, when the overload current passes through the narrow neck 631, the middle position of the narrow neck 631 can first reach the melting temperature, thereby reducing the melting time, realizing accurate melting of the narrow neck 631, and when working normally, the two ends of the narrow neck 631 rapidly transfer heat away from the middle position, reducing the probability of accidental melting of the narrow neck 631 due to overheating, and improving the reliability of the signal fuse 60.

[0153] In some embodiments of the present application, as shown in Figure 5 In the direction from the first plate part 61 to the second plate part 62, the melting part 63 extends along an arc line protruding to one side in the thickness direction of the signal fuse 60.

[0154] In the technical solution, since the melting part 63 extends along the arc line protruding to one side, not only can the structural strength of the melting part 63 be improved, when the signal fuse 60 is subjected to external force impact or thermal stress change, stress can be better dispersed, the risk of fracture of the melting part 63 due to stress concentration can be reduced, the surface area of the melting part 63 can be increased, the heat dissipation area of the melting part 63 when working normally can be improved, the temperature distribution of the signal fuse 60 can be more uniform, the possibility of local overheating can be reduced, thereby reducing the probability of accidental melting, and the reliability of the signal fuse 60 in working can be improved.

[0155] In some embodiments of the present application, as shown in Figure 6 As shown in the drawings, the conductor piece 30 includes a first segment 31, a structural weak segment 32, and a second segment 33 connected in sequence in the length direction of the conductor piece 30 (for example, the third direction X shown in the drawings). Figure 6 As shown in the drawings, the conductor piece 30 includes a first segment 31, a structural weak segment 32, and a second segment 33 connected in sequence in the length direction of the conductor piece 30 (for example, the third direction X shown in the drawings).

[0156] The “structural weak area” refers to a specific area on the structural weak segment 32, the structural strength of the specific area is lower than that of other areas of the structural weak segment 32, and under the action of external force on the structural weak segment 32, the specific area preferentially fractures to other areas.

[0157] As an example, the local thickness or cross-sectional area of the structural weak segment 32 can be reduced to form the structural weak area, or a weakening groove or weakening hole can be formed on the structural weak segment 32, the area shaped with the weakening groove or weakening hole is the structural weak area of the structural weak segment 32, or the local part of the structural weak segment 32 can be specially treated to reduce the hardness and toughness of the local part, thereby forming the structural weak area.

[0158] Referring toFigure 3 and in combination Figure 6 The conductor piece 30 is formed as a copper bar extending along the third direction X, the conductor piece 30 is a one-piece, the conductor piece 30 comprises the first section 31, the structural weak section 32 and the second section 33, the first section 31 and the second section 33 are connected through the structural weak section 32. The breaking device 40 is opposite to the structural weak section 32 of the conductor piece 30 in the first direction Z, when the gas generator 50 is triggered or excited, the gas generated by the gas generator 50 pushes the breaking device 40 to move along the first direction Z to impact the structural weak section 32 of the conductor piece 30, so that the conductor piece 30 is broken at the position of the structural weak section 32, and the circuit is broken.

[0159] In the above technical solution, by forming the structural weak section 32 on the structural weak section 32, the breaking device 40 can accurately cut the structural weak section 32 at a specific position, improve the reliability and consistency of cutting, accurately control the on-off of the circuit, and reduce unnecessary damage to other parts of the conductor piece 30 and other faults or damages caused by the cutting process.

[0160] In some embodiments of the present application, as shown in Figure 3 The shell comprises an arc-extinguishing shell 11, an assembly shell 12 and a cover plate 13, the arc-extinguishing shell 11 defines a second cavity open on one side in the first direction Z, the conductor piece 30 is arranged on the open side of the arc-extinguishing shell 11 and partially extends into the second cavity, the assembly shell 12 is connected with the arc-extinguishing shell 11 and located on the open side of the arc-extinguishing shell 11, the assembly shell 12 defines a first cavity 101, the first cavity 101 is open on the side away from the arc-extinguishing shell 11 in the first direction Z, and the cover plate 13 is arranged on the open side of the assembly shell 12.

[0161] That is, the arc-extinguishing shell 11, the assembly shell 12 and the cover plate 13 are arranged in sequence and connected in the first direction Z, and the cover plate 13 and the assembly shell 12 cooperatively define the first cavity 101, and the assembly shell 12 and the arc-extinguishing shell 11 cooperatively define the second cavity. One end of the conductor piece 30 extends into the second cavity, and the other end is located on the outside of the shell for connecting external electrical elements, and the conductor piece 30 is arranged on the side of the arc-extinguishing shell 11 close to the assembly shell 12.

[0162] As shown in Figure 3 In some examples, the side of the arc-extinguishing shell 11 facing the assembly shell 12 is formed with a recessed positioning groove, the positioning groove penetrates the arc-extinguishing shell 11 along the third direction X, the positioning groove is in communication with the first cavity 101 and the second cavity, the conductor piece 30 extends along the third direction X and cooperates in the positioning groove, and is fixedly connected with the arc-extinguishing shell 11.

[0163] Further, as shown in Figure 3As shown, the positioning groove is formed with a limiting recess on opposite two side walls in the second direction Y, and the conductor piece 30 is provided with limiting protrusions on opposite two sides in the second direction Y, the limiting protrusions are matched in the limiting recess, for limiting the conductor piece 30 from moving relative to the arc-extinguishing shell 11 in the third direction X.

[0164] The second cavity defined by the assembly shell 12 and the arc-extinguishing shell 11 is an arc-extinguishing cavity of the fuse 100, and the arc-extinguishing cavity can be filled with arc-extinguishing medium. When an arc is generated due to overcurrent in the circuit, the arc-extinguishing shell 11 can limit the arc in the second cavity, and the arc is cooled and diffused through contact and interaction with the cavity wall or the arc-extinguishing medium, so as to achieve the purpose of arc extinguishing and protect the safety of the circuit and the equipment.

[0165] Further, the cover plate 13 and the assembly shell 12 cooperatively define the first cavity 101, and the cover plate 13 and the assembly shell 12 are detachably connected. The assembly shell 12 and the arc-extinguishing shell 11 cooperatively define the second cavity, and the assembly shell 12 and the arc-extinguishing shell 11 are detachably connected.

[0166] In the above technical solution, the circuit board 20, the gas generator 50 and the breaking device 40 can be conveniently assembled into the first cavity 101, and the conductor piece 30 and the remaining components in the second cavity can be conveniently assembled into the second cavity, so as to improve the assembly efficiency and the assembly and maintenance efficiency of the fuse 100. In addition, the electrical elements in the first cavity 101 and the second cavity can be protected, the probability of dust and foreign matter entering the first cavity 101 and the second cavity is reduced, and the reliability and service life of the fuse 100 are improved.

[0167] In a second aspect, the embodiments of the present application also provide a battery device 1000, which comprises the fuse 100 of any one of the above embodiments.

[0168] The battery device 1000 can comprise a box body 200, a battery monomer assembly and the fuse 100, and the battery monomer assembly and the fuse 100 are arranged in the box body 200. The battery monomer assembly comprises a plurality of battery monomers 300 arranged in layers.

[0169] For example, the fuse 100 can be connected in series on a connecting wire between two connected battery monomers 300 in the battery monomer assembly, or connected in series on a connecting wire between two adjacent battery monomer assemblies. For example, the fuse 100 can be connected in series on a positive and negative output circuit of the battery monomer assembly, for protecting downstream circuits and equipment when the battery monomer assembly supplies power to external circuits. For example, the fuse 100 can be arranged on a connecting wire between a battery management system and the battery monomer assembly, or arranged on a power input circuit of the battery management system, for protecting the battery management system.

[0170] In the technical solution, the battery device 1000 is provided with the fuse 100, and the fuse 100 is provided with the plurality of gas generators 50 connected in parallel and connected to the trigger circuit of the circuit board 20, so that the plurality of gas generators 50 can be triggered at the same time, the pushing force on the breaking device 40 is increased, the response speed of the fuse 100 to the circuit breaking is improved, the risk of the circuit not being effectively disconnected due to the failure of the gas generator 50 is significantly reduced, and the reliability of the fuse 100 to disconnect the circuit is improved.

[0171] In a third aspect, the embodiments of the present application further provide a power utilization device 1 comprising the battery device 1000 of any of the above embodiments. The battery device 1000 is used to store or provide electric energy.

[0172] In the technical solution, the power utilization device 1 is provided with the battery device 1000, so that the overall performance of the power utilization device 1 is improved.

[0173] In a fourth aspect, the embodiments of the present application further provide an energy storage device comprising the battery device 1000 of any of the above embodiments.

[0174] In the technical solution, the energy storage device is provided with the battery device 1000, so that the overall performance of the energy storage device is improved.

[0175] The embodiments of the present application provide an energy storage device comprising one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can comprise a plurality of battery devices 1000 connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device comprises a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

[0176] The energy storage device can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electric energy as needed and output electric energy at appropriate times. For example, the energy storage device can store electric energy during the low valley of electricity consumption, and provide electric energy for related users or electricity consuming equipment during the peak of electricity consumption.

[0177] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0178] In some embodiments, the energy storage device can comprise a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0179] In some embodiments, the energy storage device can comprise a thermal management module, a master control module, a general control module, a power distribution module, a fire-fighting module, and the like.

[0180] As an example, the thermal management module can include a liquid cooling unit that provides a cooling liquid through a pipeline to each battery device 1000 for adjusting the temperature of the battery cells 300.

[0181] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current, voltage, and the like of the battery cluster can be controlled. The master control module includes a slave battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch, and the like.

[0182] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current, voltage, and the like of the battery cluster can be controlled. The master control module includes a slave battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch, and the like.

[0183] As an example, the fire control module includes a control panel, a detector, an alarm device, and the like, for detecting, alarming, or extinguishing the energy storage device.

[0184] As an example, the power distribution module can be used to distribute power to the power consumption modules of the energy storage device.

[0185] The battery device 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings. Figures 2-6 The battery device 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0186] Referring to Figure 2 The battery device 1000 includes a box body 200, a plurality of battery cells 300, and a plurality of fuses 100. The box body 200 includes a first box body 210 and a second box body 220 that are coupled together to define a receiving cavity. The plurality of battery cells 300 are arranged in a stacked manner along the length and width directions of the box body 200, and are connected in series and in parallel with each other. The plurality of fuses 100 are arranged in the box body 200. Some of the plurality of fuses 100 are electrically connected to the battery cell assemblies, and the other fuses are electrically connected to the battery management system.

[0187] Specifically, as Figure 3 and Figure 4As shown, the fuse 100 comprises a cover plate 13, a circuit board 20, two gas generators 50, a breaking device 40, an assembly shell 12, a signal fuse 60, a conductor piece 30, a connecting conductor 70 and an arc-extinguishing shell 11. The cover plate 13, the assembly shell 12 and the arc-extinguishing shell 11 are arranged along a first direction Z and connected together, and cooperatively define a first cavity 101 and a second cavity, the first cavity 101 being spaced apart from the second cavity along the first direction Z.

[0188] The circuit board 20, the two gas generators 50 and the breaking device 40 are all arranged in the first cavity 101, wherein the two gas generators 50 are arranged between the circuit board 20 and the breaking device 40, and each of the two gas generators 50 has a heating resistor, which is a first resistor R1 or a second resistor R2.

[0189] The signal fuse 60, the conductor piece 30 and the connecting conductor 70 are all arranged in the second cavity, one end of the conductor piece 30 and one end of the connecting conductor 70 both extend into the second cavity and are connected by the signal fuse 60, and the other end of the conductor piece 30 and the other end of the connecting conductor 70 both extend out of the second cavity from opposite sides of the arc-extinguishing shell 11 along a third direction X.

[0190] The signal fuse 60 is arranged on one side of the conductor piece 30 and the connecting conductor 70 in a thickness direction, and the two ends of the signal fuse 60 along the third direction X are connected to the conductor piece 30 and the connecting conductor 70 respectively, the signal fuse 60 has a fuse portion 63 formed thereon, the fuse portion 63 has an arc-shaped structure protruding towards the first direction Z, and a plurality of perforations 632 are formed on the fuse portion 63 by stamping and are arranged along a second direction Y, and a neck 631 is defined between adjacent perforations 632, and different sizes of the neck 631 can be obtained by changing the size of the perforations 632.

[0191] The circuit board 20 has a trigger circuit, and the first resistor R1 and the second resistor R2 are both connected to the trigger circuit. Specifically, the trigger circuit comprises a transformer T1, a rectifier D, a first diode D1, a second diode D2, a transient voltage suppression diode TVS1 and an external interface end F1, the primary of the transformer T1 is adapted to receive an arc signal generated when the signal fuse 60 is fused, the rectifier D is connected to the secondary of the transformer T1, the two ends of the transient voltage suppression diode TVS1, the two ends of the first resistor R1 and the two ends of the second resistor R2 are connected to the positive output end and the negative output end of the rectifier D respectively, the positive end and the negative end of the external interface end F1 are connected to the two ends of the first resistor R1 respectively, and the second diode D2 is connected in series between the positive end of the external interface end F1 and the first resistor R1, the anode of the first diode D1 is connected to one end of the second resistor R2, and the cathode of the first diode D1 is connected between the cathode of the second diode D2 and the first resistor R1.

[0192] The triggering process of the fuse 100 in the case of short circuit and the triggering process by external signal are described below.

[0193] Short circuit current triggering: when a certain string of the battery device 1000 has a short circuit or other failure, the current through the signal fuse 60 increases sharply, and the signal fuse 60 rapidly heats up under the action of the excessive current. When the temperature reaches the melting point of the signal fuse 60, the signal fuse 60 melts, and an arc signal is generated at the moment of melting and is received by the primary side of the transformer T1. The electrical signal generated by the secondary side of the transformer T1 passes through the rectifier D, which converts the alternating current signal into a direct current signal to ensure that the direction of the output current meets the working requirements of the heating resistor of the gas generator 50. The rectified direct current signal is transmitted to the first resistor R1 and the second resistor R2. The first resistor R1 and the second resistor R2 are energized and heated, and the heat causes the gas generating agent or pyrotechnic agent inside the gas generator 50 to react chemically, generating a large amount of gas. These gases rapidly expand in the first cavity 101 inside the housing of the fuse 100, forming a high-pressure environment and driving the breaking device 40 to act, which in turn acts on the conductor 30 to disconnect it, thereby cutting off the entire circuit and achieving short circuit protection.

[0194] External signal triggering: when the battery device 1000 is subjected to a collision or receives a triggering signal from the use device 1, the control system can control the external interface end F1 to be conductive with the control power supply. Since the first diode D1 has the function of preventing reverse current, the current flowing through the control power supply will only pass through the second diode D2 and the first resistor R1, but not through the first diode D1 and the second resistor R2. In this way, only the first resistor R1 heats up, and the heat ignites the gas generator 50 with the first resistor R1, driving the breaking device 40 to act, which in turn acts on the conductor 30 to disconnect it, thereby cutting off the entire circuit and achieving control and protection of the circuit.

[0195] It should be noted that the voltage caused by the system short circuit current may be too large or too small, which may cause the gas generator 50 to fail to ignite. By setting two gas generators 50 to be triggered or ignited simultaneously in the case of short circuit, the probability of ignition of the gas generator 50 can be improved, and the reliability of cutting off the circuit in the case of short circuit can be improved. When triggered by an external signal, since the external signal input is relatively stable, only one gas generator 50 is triggered, which can reliably drive the breaking device 40 to cut off the conductor 30.

[0196] In addition, one of the two gas generators 50 is used not only for short-circuit current triggering but also for external signal triggering. In other words, when the fuse 100 is triggered by short-circuit current, it not only has a dedicated gas generator 50 for short-circuit current triggering but also uses an additional gas generator 50 for external signal triggering, thereby ensuring reliable circuit disconnection when the circuit is short-circuited.

[0197] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fuse, characterized in that, The shell defines a first cavity (101) and a second cavity (102) arranged in a spaced manner. The circuit board (20) is arranged in the first cavity (101) and has a trigger circuit. The conductor (30) is arranged in the second cavity (102). The breaking device (40) is arranged in the first cavity (101). A plurality of gas generators (50) are arranged in the first cavity (101) and are connected in parallel to the trigger circuit, and the trigger circuit is configured to trigger the gas generators (50) to drive the breaking device (40) to cut off the conductor (30). Further comprising:

2. The fuse of claim 1, wherein A signal fuse (60) connected in series with the conductor (30), and the signal fuse (60) is configured to generate an arc signal when fused. The trigger circuit comprises a transformer (T1) and a rectifier (D), the primary of the transformer (T1) is configured to receive the arc signal, and the secondary of the transformer (T1) is connected in series with the heating resistor of the gas generator (50) through the rectifier (D), and the heating resistors of the plurality of gas generators (50) are connected in parallel across the rectifier (D). The resistance values of the heating resistors of the plurality of gas generators (50) are the same, or the resistance values of the heating resistors of at least two gas generators (50) are different.

3. The fuse of claim 2, wherein The number of the gas generators (50) is two.

4. The fuse of claim 2, wherein The trigger circuit further comprises an external interface terminal (F1), and the two ends of the heating resistors of the gas generators (50) are adapted to be connected in series with a control power supply through the external interface terminal (F1).

5. The fuse of claim 2, wherein, Some of the heating resistors are first resistors (R1) and the other heating resistors are second resistors (R2), a first diode (D1) is connected in series between the second resistors (R2) and the positive terminal of the external interface terminal (F1), and the cathode of the first diode (D1) is connected to the positive terminal of the external interface terminal (F1).

6. The fuse of claim 5, wherein, A second diode (D2) is connected in series between the first resistors (R1) and the positive terminal of the external interface terminal (F1), and the anode of the second diode (D2) is connected to the positive terminal of the external interface terminal (F1).

7. The fuse of claim 6, wherein The cathode of the first diode (D1) is connected between the first resistors (R1) and the cathode of the second diode (D2). The trigger circuit further comprises a transient voltage suppression diode (TVS1) connected across the rectifier (D).

8. The fuse of claim 2, wherein, Further comprising:

9. The fuse of claim 2, wherein, A connecting conductor (70) connected to the conductor (30) through the signal fuse (60), and the connecting conductor (70) is used to connect an external electrical element. ​ 10. The fuse of claim 9, wherein, The signal fuse (60) is in a sheet shape and includes a first plate portion (61), a second plate portion (62), and a fuse portion (63). The first plate portion (61) and the second plate portion (62) are arranged apart from each other in a width direction of the signal fuse (60) and are connected to the conductor member (30) and the connection conductor (70), respectively. The fuse portion (63) is connected between the first plate portion (61) and the second plate portion (62). The fuse portion (63) includes a plurality of necks (631) arranged apart from each other in a length direction of the signal fuse (60). Through-holes (632) that pass through the signal fuse (60) in a thickness direction of the signal fuse (60) are defined between adjacent necks (631).

11. The fuse of claim 10, wherein In a direction from the first plate portion (61) toward the second plate portion (62), a cross-sectional area of the neck (631) gradually decreases and then gradually increases.

12. The fuse of claim 10, wherein, In a direction from the first plate portion (61) toward the second plate portion (62), the fuse portion (63) extends along an arc line that protrudes toward one side in the thickness direction of the signal fuse (60).

13. The fuse of any one of claims 2-12, wherein, The conductor member (30) includes a first segment (31), a structurally weak segment (32), and a second segment (33) that are connected in series in a length direction of the conductor member (30). The structurally weak segment (32) has a structurally weak region. The gas generator (50) is configured to drive the breaking device (40) to cut the structurally weak segment (32) at the structurally weak region when the gas generator (50) is triggered. The signal fuse (60) is connected to one end of the first segment (31) or the second segment (33) that is away from the structurally weak segment (32).

14. The fuse of any one of claims 1-12, wherein, The housing includes: An arc extinguishing shell (11) that defines the second cavity that is open on one side in a first direction (Z). The conductor member (30) is arranged on the open side of the arc extinguishing shell (11) and partially extends into the second cavity. An assembly shell (12) that is connected to the arc extinguishing shell (11) and is located on the open side of the arc extinguishing shell (11). The assembly shell (12) defines the first cavity (101) that is open on one side away from the arc extinguishing shell (11) in the first direction (Z). A cover plate (13) that covers the open side of the assembly shell (12).

15. A battery device characterized by comprising: It includes: A box body (200), a battery monomer (300) assembly, and a fuse (100) according to any one of claims 1-14. The battery monomer (300) assembly and the fuse (100) are both arranged in the box body (200), and the fuse (100) is electrically connected to the battery monomer (300) assembly.

16. An electrical device, comprising: It includes the battery device (1000) of claim 15.

17. An energy storage device, characterized by It includes the battery device (1000) of claim 15.

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