Circuit protection device and battery pack, electric device

Abstract

The application discloses a kind of circuit protection device and battery pack, electric device, it is related to circuit protection technical field, circuit protection device includes: detector, detector is electrically connected with conducting part to detect electric signal condition;First control unit, first control unit is electrically connected with detector, wherein, when the signal received by first control unit reaches the first preset condition of detector, first control unit is used to control conducting part circuit breaking.According to the circuit protection device of embodiment of the application, by directly using the first control unit of circuit protection device itself to process signal, it is convenient to reduce the propagation path of signal, improve the response speed of circuit protection device, and then timely disconnect conducting part when needed, improve the safety of conducting part transmission electric signal.

Description

Technical Field

[0001] This invention relates to the field of circuit protection technology, and more specifically, to a circuit protection device, a battery pack, and an electrical appliance. Background Technology

[0002] In related technologies, the fuse is electrically connected to the battery management control unit. When the battery pack malfunctions, the battery management control unit controls the fuse to disconnect the battery pack from the power supply to the electrical device. However, due to the long communication path between the battery management control unit and the fuse, the fuse's response speed is slow. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a circuit protection device that processes signals directly using its own first control unit, thereby reducing the signal propagation path, improving the response speed of the circuit protection device, and thus promptly disconnecting conductive components when needed, thereby improving the safety of electrical signal transmission through conductive components.

[0004] The present invention also proposes a battery pack having the aforementioned circuit protection device.

[0005] The present invention also proposes an electrical device with a battery pack.

[0006] According to a first aspect of the present invention, a circuit protection device includes: a detector electrically connected to a conductive element to detect electrical signals; and a first control unit electrically connected to the detector, wherein when the first control unit receives a signal from the detector that meets a first preset condition, the first control unit controls the conductive element to disconnect.

[0007] According to the circuit protection device of the present invention, by directly utilizing the first control unit of the circuit protection device itself to process the signal, it is easier to reduce the signal propagation path, improve the response speed of the circuit protection device, and thus disconnect the conductive component in a timely manner when needed, thereby improving the safety of the conductive component transmitting electrical signals.

[0008] In addition, the circuit protection device according to the above embodiments of the present invention may also have the following additional technical features: According to some embodiments of the present invention, the circuit protection device further includes a fuse component having a triggered state, wherein the fuse component disconnects the conductive element in the triggered state, wherein the first control unit is electrically connected to the fuse component, and the first control unit is used to control the fuse component to switch to the triggered state when the signal of the detector reaches a first preset condition.

[0009] According to some alternative embodiments of the present invention, the safety assembly includes a movable element for cutting off the conductive element.

[0010] According to some optional embodiments of the present invention, the safety assembly includes an ignition tube, the ignition tube being provided with an electrical connector, the electrical connector being electrically connected to the first control unit.

[0011] According to some optional embodiments of the present invention, the circuit protection device further includes a second external component electrically connected to an external control unit, the second external component being electrically connected to the fuse assembly.

[0012] According to some optional embodiments of the present invention, the second external component is disposed on the side of the first control unit away from the safety assembly, the electrical connector passes through the first control unit, and the electrical connector is electrically connected to the first control unit and the second external component respectively.

[0013] According to some optional embodiments of the present invention, the first control unit is provided with a connection hole, and the second external component is provided with a connection pin, the connection pin passing through the connection hole and electrically connected to the first control unit and the safety component.

[0014] According to some embodiments of the present invention, the detector includes a resistive terminal, the conductive element includes a first conductive portion and a second conductive portion, the first conductive portion and the second conductive portion are arranged along the direction of current flow, a first end of the resistive terminal is connected to the first conductive portion, and a second end of the resistive terminal is connected to the second conductive portion.

[0015] According to some optional embodiments of the present invention, the detector further includes a sampling unit, which is connected to both ends of the resistor terminal to sample the voltage difference between the two ends of the resistor terminal, and the sampling unit is electrically connected to the first control unit.

[0016] According to some optional embodiments of the present invention, the circuit protection device further includes a connecting pin, the two ends of which are electrically connected to the sampling unit and the first control unit, respectively.

[0017] According to some alternative embodiments of the present invention, the circuit protection device further includes the conductive element, wherein the first control unit is located on the side of the safety assembly opposite to the conductive element in the axial movement direction of the movable element.

[0018] According to some specific embodiments of the present invention, the conductive member is provided with a weak portion, the thickness of the weak portion being less than the thickness of the rest of the conductive member, and in the axial movement direction of the movable member, the projection of the movable member at least partially overlaps with the projection of the weak portion.

[0019] According to some optional embodiments of the present invention, the movable member is provided with a cutting edge, and in the axial movement direction of the movable member, the projection of the weak portion covers the projection of the cutting edge, and the cutting edge is used to cut off the weak portion.

[0020] According to some specific embodiments of the present invention, the weak part includes two inclined surfaces spaced apart in a first direction, one end of the two inclined surfaces intersecting to form a V-shaped structure, and the first direction is perpendicular to the axial movement direction of the movable member.

[0021] According to some embodiments of the present invention, the circuit protection device further includes a housing, the conductive element is disposed in the housing, and at least a portion of both ends of the conductive element extends out of the housing to transmit electrical signals.

[0022] According to some embodiments of the present invention, the housing defines a receiving cavity, the movable member is movably disposed within the receiving cavity and slides against the sidewall of the receiving cavity.

[0023] According to some optional embodiments of the present invention, the receiving cavity is a cylindrical chamber, and the movable element is a cylindrical piston.

[0024] According to some optional embodiments of the present invention, the circuit protection device further includes an arc-extinguishing device, wherein the arc-extinguishing device and the movable member are located on opposite sides of the conductive member in the direction of axial movement of the movable member.

[0025] According to some alternative embodiments of the present invention, the housing includes a first housing portion and a second housing portion, the first control unit and the safety assembly are disposed in the first housing portion, and the arc extinguishing device is disposed in the second housing portion.

[0026] According to some specific embodiments of the present invention, in the extension direction of the conductive member, the end of the second shell portion facing the first shell portion is provided with a relief recess, and both ends of the conductive member are adapted to extend out of the shell portion from the relief recess.

[0027] According to some embodiments of the present invention, the first control unit has a first external member that extends at least partially out of the housing, the first external member being adapted for electrical connection with an external control unit.

[0028] According to a second aspect of the present invention, a battery pack is provided, the battery pack transmitting electrical signals through the conductive element, the battery pack comprising: a second control unit; and a circuit protection device according to a first aspect of the present invention, wherein the second control unit is used to control the conductive element to disconnect under a second preset condition.

[0029] According to the battery pack of the present invention, by utilizing the circuit protection device described in the first aspect of the present invention, the signal is processed directly by the first control unit of the circuit protection device itself, which facilitates the reduction of the signal propagation path, improves the response speed of the circuit protection device, and thus disconnects the conductive component in a timely manner when needed, thereby improving the safety of the conductive component transmitting electrical signals.

[0030] According to some embodiments of the present invention, the circuit protection device further includes a fuse component, the fuse component including a movable element, the fuse component having a triggered state, in which the movable element is used to cut off the conductive element, wherein the second control unit is electrically connected to the fuse component, and the second control unit is used to control the fuse component to switch to the triggered state under a second preset condition.

[0031] According to some embodiments of the present invention, the battery pack further includes a sensor for detecting operating status parameters within the battery pack, the sensor communicating with the second control unit, and the second preset condition including the operating status parameters within the battery pack reaching a set value.

[0032] According to some embodiments of the present invention, the second control unit is electrically connected to the first control unit.

[0033] According to a third aspect of the present invention, an electrical device is provided, the electrical device comprising: a battery pack, the battery pack being the battery pack described in a second aspect of the present invention.

[0034] According to an embodiment of the present invention, the electrical device utilizes a battery pack as described in the second aspect of the present invention, and directly utilizes the first control unit of the circuit protection device itself to process signals, thereby reducing the signal propagation path, improving the response speed of the circuit protection device, and thus promptly disconnecting the conductive components when needed, thereby improving the safety of the conductive components transmitting electrical signals.

[0035] According to some embodiments of the present invention, the electrical device further includes: an airbag system, the airbag system being communicatively connected to the second control unit, and the second preset condition including the airbag system detecting a vehicle collision.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a schematic diagram of the circuit protection device according to an embodiment of the present invention; Figure 2 This is a front view of a circuit protection device according to an embodiment of the present invention; Figure 3 yes Figure 2 Sectional view at point AA; Figure 4 This is a side view of a circuit protection device according to an embodiment of the present invention; Figure 5 yes Figure 4 Sectional view at point BB; Figure 6 This is an exploded view of a portion of the structure of a circuit protection device according to an embodiment of the present invention; Figure 7 This is a partial structural cross-sectional view of a circuit protection device according to an embodiment of the present invention; Figure 8 This is an electrical connection diagram of a battery pack according to an embodiment of the present invention; Figure 9 This is a signal transmission diagram of a battery pack according to an embodiment of the present invention; Figure 10 This is a control logic diagram of a battery pack according to an embodiment of the present invention.

[0038] Attached reference numerals: 1. Circuit protection device; 10. Shell; 101. First shell portion; 1011. Upper shell portion; 10111. Outer peripheral portion; 10112. Cover portion; 1012. Middle shell portion; 102. Second shell portion; 12. Relief recess; 13. Receiving cavity; 20. Conductive component; 201. First conductive part; 202. Second conductive part; 21. Weak part; 22. Inclined surface; 23. Groove; 30. Detector; 31. Resistor terminal; 32. Sampling section; 35. Connecting pin; 40. Safety component; 41. Moving part; 411. Blade; 42. Ignition tube; 421. Electrical connector; 50. First control unit; 51. First external component; 52. Connecting hole; 60. Second external component; 61. Connecting leg; 62. Outer housing; 66. Arc extinguishing device; 68. Bolt component; 7. Second control unit; 8. Sensor; 9. Airbag system. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] The circuit protection device 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0041] like Figures 1-7 As shown, the circuit protection device 1 according to an embodiment of the present invention includes a detector 30 and a first control unit 50.

[0042] The detector 30 is electrically connected to the conductive element 20 to detect the electrical signal on the conductive element 20, and the first control unit 50 is electrically connected to the detector 30.

[0043] When the first control unit 50 receives a signal from the detector 30 that meets the first preset condition, the first control unit 50 controls the conductive element 20 to disconnect the transmission of the electrical signal on the conductive element 20.

[0044] It needs to be explained here that when the electrical signal transmission on the conductive component 20 is abnormal, the signal of the detector 30 reaches a first preset condition, at which point the circuit protection device 1 controls the conductive component 20 to disconnect. Specifically, the signal of the detector 30 reaching the first preset condition includes the current and temperature on the conductive component 20 being within an abnormal range.

[0045] Specifically, the first preset condition includes a preset current value. When a short circuit or overcurrent occurs on the conductive element 20, the current will rise sharply in a very short time. When the current rises to the preset current value, the first control unit 50 is used to control the conductive element 20 to disconnect the transmission of electrical signals on the conductive element 20.

[0046] The first preset condition includes a preset temperature value. When a short circuit or overcurrent occurs in the current on the conductive element 20, the current will rise sharply in a very short time. The huge current will generate extremely high Joule heat. When the temperature reaches the preset temperature value, the first control unit 50 is used to control the conductive element 20 to disconnect the transmission of electrical signals on the conductive element 20.

[0047] In some embodiments, the detector 30 is a shunt. The detector 30 can detect the current on the conductive component 20 and transmit the current on the conductive component 20 to the first control unit 50. When the current on the conductive component 20 is abnormal, the first control unit 50 receives a signal from the detector 30 that meets a first preset condition. At this time, the circuit protection device 1 cuts off the transmission of current on the conductive component 20 to disconnect the circuit, thereby protecting the safety of the electrical device connected to the circuit and improving the safety of the circuit.

[0048] It should be explained here that an abnormal current condition on the conductive component 20 refers to a current exceeding the preset current value on the conductive component 20. Specifically, when a current exceeding the preset current value occurs on the conductive component 20, it may lead to dangers such as thermal runaway of the battery pack. Therefore, when the current on the conductive component 20 exceeds the preset current value, the conductive component 20 needs to be disconnected.

[0049] Specifically, when the resistance of the conductive element 20 or certain areas of the circuit between the conductive element 20 and the electrical device increases, although the current on the conductive element 20 will decrease, the current on the conductive element 20 will still be within the safe range, and this situation is not considered an abnormal situation.

[0050] The circuit protection device 1 itself has a first control unit 50 capable of analyzing data. The first control unit 50 can analyze the data signal transmitted to it by the detector 30, so that when the signal on the detector 30 reaches a first preset condition, the circuit protection device 1 can control the conductive component 20 to disconnect the circuit. In this way, when the detector 30 detects an abnormal electrical signal on the conductive component 20, there is no need for an external control unit to control the circuit protection device 1. The circuit protection device 1 can analyze the signal itself and control the conductive component 20 to disconnect the circuit in a timely manner.

[0051] Compared to existing technologies that rely on external control units to analyze data and then control the conductive element 20 to disconnect the circuit, this application directly uses the first control unit 50 of the circuit protection device 1 itself to control the conductive element 20 to disconnect the circuit. This reduces the signal propagation path, improves the response speed of the circuit protection device 1, and allows the conductive element 20 to be disconnected in time when needed, thereby improving the safety of the conductive element 20 in transmitting electrical signals.

[0052] Therefore, according to the embodiment of the present invention, the circuit protection device 1 analyzes the signal directly using the first control unit 50 of the circuit protection device 1 itself, which facilitates the reduction of the signal propagation path, improves the response speed of the circuit protection device 1, and thus disconnects the conductive element 20 in a timely manner when needed, thereby improving the safety of the conductive element 20 in transmitting electrical signals.

[0053] The circuit protection device 1 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0054] In some specific embodiments of the present invention, such as Figures 1-7 As shown, the circuit protection device 1 includes a detector 30 and a first control unit 50.

[0055] In some embodiments of the present invention, such as Figure 3 As shown, the circuit protection device 1 also includes a fuse component 40, which has a triggered state. In the triggered state, the fuse component 40 cuts off the conductive element 20.

[0056] The first control unit 50 is electrically connected to the fuse component 40. The first control unit 50 is used to control the fuse component 40 to switch to the trigger state when the signal of the detector 30 reaches the first preset condition, so as to disconnect the conductive element 20 by the fuse component 40 when the signal of the detector 30 reaches the first preset condition.

[0057] Specifically, the detector 30 can detect the power signal on the conductive component 20 and transmit the power signal status of the conductive component 20 to the first control unit 50. When the power signal status of the conductive component 20 is abnormal, the first control unit 50 controls the fuse component 40 to switch to the triggered state, so that the fuse component 40 cuts off the conductive component 20, thereby cutting off the transmission of the power signal on the conductive component 20, disconnecting the circuit, and thus protecting the safety of the electrical device connected to the circuit, thereby improving the safety of the circuit.

[0058] Furthermore, integrating the detector 30 and the fuse component 40 into the circuit protection device 1, making the detector 30 and the fuse component 40 a single device, saves on the wiring harness between the detector 30 and the fuse component 40, thus saving costs.

[0059] When the electrical signal transmission on the conductive component 20 is abnormal, the signal of the detector 30 reaches a first preset condition, at which point the circuit protection device 1 controls the conductive component 20 to disconnect. Specifically, the signal of the detector 30 reaching the first preset condition includes the current and temperature on the conductive component 20 being within an abnormal range.

[0060] Specifically, the first preset condition includes a preset current value. When a short circuit or overcurrent occurs on the conductive element 20, the current will rise sharply in a very short time. When the current rises to the preset current value, the first control unit 50 is used to control the conductive element 20 to disconnect the transmission of electrical signals on the conductive element 20.

[0061] The first preset condition includes a preset temperature value. When a short circuit or overcurrent occurs in the current on the conductive element 20, the current will rise sharply in a very short time. The huge current will generate extremely high Joule heat. When the temperature reaches the preset temperature value, the first control unit 50 is used to control the conductive element 20 to disconnect the transmission of electrical signals on the conductive element 20.

[0062] In some alternative embodiments of the present invention, such as Figure 6 , Figure 7 As shown, the safety assembly 40 also includes a movable element 41, which is used to cut off the conductive element 20.

[0063] Specifically, the detector 30 can detect the power signal on the conductive component 20 and transmit the power signal status of the conductive component 20 to the first control unit 50. When the power signal status of the conductive component 20 is abnormal, the first control unit 50 controls the fuse component 40 to switch to the triggered state, causing the movable part 41 of the fuse component 40 to move to cut off the conductive component 20, thereby cutting off the transmission of the power signal on the conductive component 20, disconnecting the circuit, and thus protecting the safety of the electrical device connected to the circuit, thereby improving the safety of the circuit.

[0064] In some alternative embodiments of the present invention, such as Figure 3 , Figure 7 As shown, the fuse assembly 40 includes an ignition tube 42, which is provided with an electrical connector 421. The electrical connector 421 is electrically connected to the first control unit 50 to realize the electrical connection between the fuse assembly 40 and the first control unit 50. Then, when the first control unit 50 receives the signal from the detector 30 and the first preset condition is met, the first control unit 50 controls the fuse assembly 40 to switch to the trigger state and disconnects the conductive element 20.

[0065] Specifically, the ignition tube 42 is located between the movable part 41 and the first control unit 50, and the end of the ignition tube 42 facing the first control unit 50 is provided with an electrical connector 421, which is electrically connected to the first control unit 50.

[0066] When it is necessary to disconnect the conductive component 20, the first control unit 50 supplies current to the electrical connector 421. When the current flows through the ignition tube 42, an electric spark is formed inside the ignition tube 42, which then ignites the ignition tube 42. After the ignition tube 42 is ignited, a large amount of gas is generated, which pushes the movable component 41 toward the conductive component 20, thereby using the movable component 41 to disconnect the conductive component 20 and interrupt the transmission of electrical signals on the conductive component 20.

[0067] In some alternative embodiments of the present invention, such as Figure 1 , Figure 3 As shown, the circuit protection device 1 also includes a second external component 60 electrically connected to an external control unit. The second external component 60 is electrically connected to the fuse component 40 so that when the external control unit is electrically connected to the second external component 60, the external control unit and the fuse component 40 are electrically connected, and the external control unit can then control the fuse component 40 to switch to the trigger state.

[0068] For example, the circuit protection device 1 is applied in a vehicle. The conductive element 20 is electrically connected to the vehicle's battery pack to guide the current in the battery pack to the vehicle. When the battery pack experiences thermal runaway or the vehicle experiences a collision, the external control unit controls the fuse component 40 to switch to the triggered state after receiving the corresponding signal. At this time, the movable element 41 actively cuts off the conductive element 20, disconnects the current transmission on the conductive element 20, and cuts off the power supply from the battery pack to the vehicle. This is to prevent the battery pack from continuing to conduct electricity in the event of thermal runaway or a collision, thereby improving the vehicle's safety.

[0069] In some alternative embodiments of the present invention, such as Figure 3 As shown, the second external component 60 is located on the side of the first control unit 50 opposite to the safety component 40. The electrical connector 421 passes through the first control unit 50 and is electrically connected to the first control unit 50 and the second external component 60, respectively, so as to realize the electrical connection between the safety component 40 and the first control unit 50, and the electrical connection between the safety component 40 and the second external component 60.

[0070] Specifically, the second external connector 60 is adapted to be electrically connected to an external control unit. The external control unit is electrically connected to the electrical connector 421 through the second external connector 60, thereby realizing the electrical connection between the second external connector 60 and the fuse assembly 40. Both the external control unit and the first control unit 50 can control the fuse assembly 40 to switch to a triggered state. This allows the fuse assembly 40 to switch to a triggered state when the first control unit 50 detects an abnormal electrical signal flowing through the conductive element 20 or when the external control unit detects other abnormal conditions. This triggers the movable part 41 of the fuse assembly 40 to activate, thereby cutting off the conductive element 20 and disconnecting the transmission of electrical signals on the conductive element 20, preventing the electrical signal from continuing to transmit under abnormal conditions.

[0071] In some embodiments, such as Figure 3 As shown, the ignition tube 42 is located between the movable part 41 and the first control unit 50. The end of the ignition tube 42 facing the first control unit 50 is provided with an electrical connector 421. The electrical connector 421 passes through the first control unit 50 and is electrically connected to the first control unit 50 and the second external part 60.

[0072] When it is necessary to cut off the conductive component 20, the first control unit 50 or the external control unit supplies current to the electrical connector 421. When the current flows through the ignition tube 42, an electric spark is formed in the ignition tube 42, which then ignites the ignition tube 42. After the ignition tube 42 is ignited, a large amount of gas is generated, which pushes the movable component 41 toward the conductive component 20, thereby cutting off the conductive component 20 by using the movable component 41.

[0073] In some alternative embodiments of the present invention, such as Figure 3 , Figure 6As shown, the first control unit 50 is provided with a connection hole 52, and the second external component 60 is provided with a connection pin 61. The connection pin 61 passes through the connection hole 52 and is electrically connected to the first control unit 50 and the safety component 40.

[0074] Specifically, when the signal of the detector 30 reaches the first preset condition, the first control unit 50 transmits current to the fuse component 40 through the connection pin 61, so that the fuse component 40 can switch to the trigger state, and then use the movable part 41 on the fuse component 40 to cut off the conductive part 20.

[0075] In some embodiments, the first control unit 50 includes a PCB board with a connection hole 52. The connection pin 61 is electrically connected to the PCB board by reflow soldering or selective soldering to realize the electrical connection between the first control unit 50 and the connection pin 61.

[0076] In some embodiments, such as Figure 3 As shown, the second external connector 60 also includes an external housing 62, which defines a plug-in cavity. At least a portion of the connecting pin 61 is located within the plug-in cavity. The external housing 62 is adapted to be plugged into an external control unit to achieve an electrical connection between the connecting pin 61 and the external control unit, thereby achieving an electrical connection between the second external connector 60 and the external control unit.

[0077] In some embodiments of the present invention, such as Figure 4 , Figure 6 As shown, the detector 30 includes a resistor terminal 31, and the conductive element 20 includes a first conductive part 201 and a second conductive part 202. The first conductive part 201 and the second conductive part 202 are arranged along the direction of current flow. The first end of the resistor terminal 31 is connected to the first conductive part 201, and the second end of the resistor terminal 31 is connected to the second conductive part 202.

[0078] In the direction of current flow, the current flows sequentially through the first conductive part 201, the resistor terminal 31, and the second conductive part 202.

[0079] Specifically, the resistor terminal 31 has a structure with a specific resistance, for example, the material of the resistor terminal 31 is a manganese copper alloy, so that the resistor terminal 31 can maintain a stable resistance at different temperatures. The first control unit 50 can calculate the current through the resistor terminal 31 by the voltage difference across the resistor terminal 31, determine whether the current flowing through the resistor terminal 31 is abnormal, and then determine whether the current flowing through the conductive element 20 is abnormal. When the current flowing through the conductive element 20 is abnormal, and the signal of the detector 30 reaches the first preset condition, the first control unit 50 can control the conductive element 20 to disconnect the circuit and disconnect the transmission of the power signal on the conductive element 20.

[0080] In some embodiments, the first end of the resistor terminal 31 is welded to the first conductive part 201, and the second end of the resistor terminal 31 is welded to the second conductive part 202.

[0081] In some alternative embodiments of the present invention, such as Figure 4 , Figure 6 As shown, the detector 30 also includes a sampling unit 32, which is connected to both ends of the resistor terminal 31 to sample the voltage difference between the two ends of the resistor terminal 31. The sampling unit 32 is electrically connected to the first control unit 50 to transmit the voltage signal between the two ends of the resistor terminal 31 to the first control unit 50.

[0082] Specifically, the first control unit 50 can calculate the current through the resistor terminal 31 by the voltage difference, determine whether the current flowing through the resistor terminal 31 is abnormal, and then determine whether the current flowing through the conductive component 20 is abnormal. When the current flowing through the conductive component 20 is abnormal and the signal of the detector 30 reaches the first preset condition, the first control unit 50 can control the conductive component 20 to disconnect the circuit and disconnect the transmission of the power signal on the conductive component 20.

[0083] In some examples, the first conductive part 201 and the second conductive part 202 are both copper busbars, and the resistor terminal 31 is welded to the first conductive part 201 and the second conductive part 202 to realize the electrical connection between the resistor terminal 31 and the first conductive part 201 and the second conductive part 202.

[0084] In some alternative embodiments of the present invention, such as Figure 6 As shown, the circuit protection device 1 also includes a connecting pin 35. The two ends of the connecting pin 35 are electrically connected to the sampling unit 32 and the first control unit 50, respectively, so as to realize the electrical connection between the detector 30 and the first control unit 50 by using the connecting pin 35, so that the voltage difference across the resistor terminal 31 sampled by the sampling unit 32 can be transmitted to the first control unit 50 through the connecting pin 35. The first control unit 50 analyzes whether the current flowing through the conductive element 20 is abnormal. Then, when the current flowing through the conductive element 20 is abnormal, the first control unit 50 promptly controls the fuse component 40 to switch to the trigger state, and the fuse component 40 disconnects the conductive element 20.

[0085] In some alternative embodiments of the present invention, such as Figure 6 As shown, the circuit protection device 1 also includes a conductive element 20. In the axial movement direction of the movable element 41, the first control unit 50 is located on the side of the safety component 40 away from the conductive element 20, so that the safety component 40 is set close to the conductive element 20, so that when the safety component 40 switches to the trigger state, it can cut off the conductive element 20 in time and disconnect the transmission of the power signal on the conductive element 20.

[0086] In some embodiments, in the axial movement direction of the movable member 41, the safety assembly 40 is located between the first control unit 50 and the conductive member 20, so there is a certain distance between the first control unit 50 and the conductive member 20. The detector 30 is disposed close to the conductive member 20 to detect the electrical signal on the conductive member 20, so there is a certain distance between the detector 30 and the first control unit 50.

[0087] The circuit protection device 1 also includes a connecting pin 35, one end of which is connected to the detector 30, and the other end extends toward the first control unit 50 and is electrically connected to the first control unit 50, so as to realize the electrical connection between the detector 30 and the first control unit 50.

[0088] It should be explained here that the axial movement direction of the movable part 41 is... Figure 5 In the X direction, the connecting pin 35 extends along the X direction.

[0089] Specifically, when the ignition tube 42 is ignited and generates a large amount of gas, which pushes the movable part 41 toward the conductive part 20, the movable part 41 moves in the X direction to cut off the conductive part 20.

[0090] In some embodiments, the circuit protection device 1 further includes a housing 10, which defines a receiving cavity 13. The receiving cavity 13 is a cylindrical chamber, and a movable member 41 is movably disposed within the receiving cavity 13 and slides against the side wall of the receiving cavity 13. The axial movement direction of the movable member 41 is the axial direction of the receiving cavity 13.

[0091] In some embodiments of the present invention, the conductive member 20 is provided with a weak portion 21, the thickness of which is less than the thickness of the rest of the conductive member 20. In the axial movement direction of the movable member 41, the projection of the movable member 41 overlaps at least partially with the projection of the weak portion 21, so that when the safety component 40 switches to the trigger state, the movable member 41 can collide with the weak portion 21 when it moves, thereby cutting off the weak portion 21 on the conductive member 20 and disconnecting the conductive member 20.

[0092] Specifically, by providing a weak part 21 on the conductive element 20, it is easier to reduce the difficulty for the movable part 41 to cut off the conductive element 20, so that when the signal of the detector 30 reaches the first preset condition, the movable part 41 can cut off the conductive element 20 in time, and disconnect the current transmission in time, thereby improving the safety of current transmission.

[0093] It should be explained here that the axial movement direction of the movable part 41 is... Figure 5 The X direction in the equation.

[0094] Specifically, when the ignition tube 42 is ignited and generates a large amount of gas, which pushes the movable part 41 toward the conductive part 20, the movable part 41 moves in the X direction to cut off the conductive part 20.

[0095] In some embodiments, the circuit protection device 1 further includes a housing 10, which defines a receiving cavity 13. The receiving cavity 13 is a cylindrical chamber, and a movable member 41 is movably disposed within the receiving cavity 13 and slides against the side wall of the receiving cavity 13. The axial movement direction of the movable member 41 is the axial direction of the receiving cavity 13.

[0096] In some alternative embodiments of the present invention, such as Figure 7 As shown, the movable member 41 is provided with a blade portion 411. In the axial movement direction of the movable member 41, the projection of the weak part 21 covers the projection of the blade portion 411. The blade portion 411 is used to cut off the weak part 21, thereby disconnecting the conductive member 20 and interrupting the transmission of current on the conductive member 20.

[0097] Specifically, the projection of the weak part 21 covers the projection of the blade part 411 so that when the movable part 41 moves, the blade part 411 can collide with at least a part of the weak part 21, thereby cutting off the weak part 21 and disconnecting the conductive part 20.

[0098] In some examples, the cross-section of the blade portion 411 is triangular or nearly triangular. In the direction toward the conductive member 20, the blade portion 411 gradually narrows and thins. When the movable member 41 moves and the blade portion 411 collides with the weak part 21, the blade portion 411 can apply a large pressure to the weak part 21, thereby cutting off the weak part 21 and disconnecting the conductive member 20.

[0099] In some examples, such as Figure 6 , Figure 7 As shown, the blade portion 411 protrudes from the movable member 41. When the safety component 40 switches to the trigger state, the movable member 41 moves to drive the blade portion 411 to move toward the conductive member 20 in the X direction. At this time, the blade portion 411 applies force to the weak portion 21 to cut off the weak portion 21, thereby disconnecting the conductive member 20 and disconnecting the transmission of current on the conductive member 20.

[0100] In some specific embodiments of the present invention, such as Figure 7 As shown, the weak part 21 includes two inclined surfaces 22 spaced apart in the first direction. One end of the two inclined surfaces 22 intersects to form a V-shaped structure. The first direction is perpendicular to the axial movement direction of the movable part 41.

[0101] The two inclined surfaces 22 are adapted to guide the movement of the blade part 411, so that when the moving part 41 drives the blade part 411 to move, the blade part 411 can move along the extension direction of the inclined surface 22 towards the weak part 21, so that the blade part 411 can smoothly contact the weak part 21 and smoothly cut the weak part 21.

[0102] In some embodiments, the blade portion 411 and the intersection of the two inclined surfaces 22 are directly opposite each other in the X direction. When the movable member 41 moves in the X direction, the blade portion 411 collides with the intersection of the two inclined surfaces 22, thereby cutting off the weak part 21 and disconnecting the conductive member 20.

[0103] In some embodiments, such as Figure 6 , Figure 7 As shown, the conductive component 20 is provided with a groove 23, which is a V-shaped groove. The two inclined surfaces 22 are the two side walls of the groove 23 in the first direction. The opening of the groove 23 facing the movable component 41 is larger. The extension direction of the opposite side wall of the blade part 411 in the first direction is the same as the extension direction of the inclined surface 22 of the groove 23. When the blade part 411 is inserted into the groove 23, the inclined surface 22 of the groove 23 matches the opposite side wall of the blade part 411 in the first direction, thereby guiding the movement direction of the blade part 411. This allows the blade part 411 to move smoothly towards the weak part 21, so that the blade part 411 collides with the weak part 21, thereby breaking the weak part 21 and cutting off the conductive component 20.

[0104] Furthermore, the groove 23 penetrates the opposite sidewall of the conductive member 20 along the second direction. The second direction, the first direction, and the axial movement direction of the movable member 41 are perpendicular to each other. The length direction of the blade portion 411 extends along the second direction so that when the blade portion 411 collides with the weak part 21, the blade portion 411 can completely cut off the conductive member 20.

[0105] In some embodiments of the present invention, such as Figure 3 , Figure 5 As shown, the circuit protection device 1 also includes a housing 10, a conductive element 20 disposed on the housing 10, and at least a portion of both ends of the conductive element 20 extending out of the housing 10 to transmit current, so that the conductive element 20, the detector 30, the first control unit 50 and the fuse assembly 40 can be integrated by the housing 10 to form the circuit protection device 1, and the housing 10 can also be used to protect the conductive element 20, the detector 30, the first control unit 50 and the fuse assembly 40.

[0106] In some alternative embodiments of the present invention, such as Figure 5As shown, the housing 10 defines a receiving cavity 13, and the movable member 41 is movably disposed in the receiving cavity 13 and slides against the side wall of the receiving cavity 13 to guide the movement of the movable member 41 so that the movable member 41 can smoothly disconnect the conductive member 20 when it moves.

[0107] In some alternative embodiments of the present invention, the receiving cavity 13 is a cylindrical chamber and the movable member 41 is a cylindrical piston, so as to achieve a sealing fit between the movable member 41 and the wall of the receiving cavity 13 when the movable member 41 moves.

[0108] In some embodiments, the safety assembly 40 further includes an ignition tube 42, which is disposed between the movable member 41 and the first control unit 50. When it is necessary to cut off the conductive member 20, the first control unit 50 supplies current to the ignition tube 42. When the current flows through the ignition tube 42, an electric spark is formed in the ignition tube 42, which then ignites the ignition tube 42. After the ignition tube 42 is ignited, a large amount of gas is generated to push the movable member 41 toward the conductive member 20, thereby cutting off the conductive member 20 by using the movable member 41.

[0109] The movable part 41 is a cylindrical piston to achieve a sealed fit between the movable part 41 and the wall of the receiving cavity 13, thereby preventing gas leakage after the ignition tube 42 is ignited, ensuring sufficient force on the movable part 41 so that the movable part 41 can move and disconnect the conductive part 20.

[0110] Furthermore, the movable member 41 includes a piston portion and a blade portion 411. The piston portion slides into the wall of the receiving cavity 13, and the blade portion 411 protrudes from the end of the piston portion. When the safety assembly 40 switches to the trigger state, the movable member 41 moves to drive the blade portion 411 to move toward the conductive member 20 in the X direction. At this time, the blade portion 411 applies force to the weak portion 21 to cut off the weak portion 21, thereby disconnecting the conductive member 20 and disconnecting the transmission of current on the conductive member 20.

[0111] In some embodiments of the present invention, such as Figure 5 As shown, the circuit protection device 1 also includes an arc extinguishing device 66, which is disposed inside the housing 10. In the direction of axial movement of the movable member 41, the arc extinguishing device 66 and the movable member 41 are located on both sides of the conductive member 20. The arc extinguishing device 66 is used to eliminate the electric arc generated when the conductive member 20 is disconnected, so as to ensure the safety of the circuit protection device 1.

[0112] Since the conductive element 20 is used to transmit current, an electric arc will be generated when the movable element 41 disconnects the conductive element 20. By setting an arc-extinguishing device 66 on the side of the conductive element 20 away from the movable element 41, the electric arc falls into the arc-extinguishing device 66, and the arc is extinguished by the arc-extinguishing device 66, thus ensuring the safety of the circuit protection device 1.

[0113] In some embodiments, the arc extinguishing device 66 may be an arc extinguishing grid, a magnet, flame-retardant cotton, or an air-blowing arc extinguishing structure, without further restrictions.

[0114] In some alternative embodiments of the present invention, such as Figure 3 , Figure 5 As shown, the housing 10 includes a first housing portion 101 and a second housing portion 102. The first control unit 50 and the safety component 40 are disposed in the first housing portion 101, and the arc extinguishing device 66 is disposed in the second housing portion 102.

[0115] This makes the housing 10 include a first housing portion 101 and a second housing portion 102 that can be detachably fitted, which facilitates the placement of the first control unit 50 and the safety component 40 in the first housing portion 101 and the placement of the arc extinguishing device 66 in the second housing portion 102.

[0116] In some embodiments, the safety assembly 40 includes a movable member 41 and an ignition tube 42. The first housing portion 101 includes an upper housing portion 1011 and a middle housing portion 1012. The middle housing portion 1012 is located between the upper housing portion 1011 and the second housing portion 102. The middle housing portion 1012 defines a receiving cavity 13. The movable member 41 is disposed in the middle housing portion 1012. The ignition tube 42 is disposed in the upper housing portion 1011. The first control unit 50 is disposed in the upper housing portion 1011.

[0117] In some examples, the upper housing 1011 includes an outer peripheral portion 10111 and a cover portion 10112. The outer peripheral portion 10111 defines an opening at one end opposite to the middle housing portion 1012. The ignition tube 42 is adapted to be installed into the upper housing 1011 through the opening. The first control unit 50 is adapted to be installed above the ignition tube 42 from the opening.

[0118] The cover 10112 is used to close the opening to provide a relatively enclosed environment for the ignition tube 42 and the first control unit 50, reducing the possibility that the ignition tube 42 and the first control unit 50 will be affected by external environmental interference.

[0119] The cover 10112 and the outer periphery 10111 shell are fixedly connected by bolts 68.

[0120] In some examples, the circuit protection device 1 also includes a flame-retardant part located inside the upper housing 1011 and surrounding the ignition tube 42 to prevent fire from occurring when the ignition tube 42 is ignited.

[0121] In some alternative embodiments of the present invention, such as Figure 4 , Figure 5As shown, in the extending direction of the conductive member 20, the second housing portion 102 is provided with a relief recess 12 opposite to the end of the first housing portion 101. Both ends of the conductive member 20 are adapted to extend out of the housing 10 from the relief recess 12 so that the conductive member 20 can be connected to the battery pack and the power device respectively, and the conductive member 20 can transmit current to the power device.

[0122] In some specific embodiments of the present invention, the second external component 60 is disposed at the end of the first housing portion 101 facing away from the second housing portion 102, so as to facilitate the external control unit to be electrically connected to the second external component 60, thereby enabling the external control unit to control the safety component 40 to switch to the trigger state in abnormal situations.

[0123] In some embodiments of the present invention, the conductive element 20 is a copper busbar, so that the resistance of the conductive element 20 is low and the current transmission efficiency is improved.

[0124] In some embodiments of the present invention, such as Figure 1 , Figure 6 As shown, the first control unit 50 has a first external connector 51 that extends at least partially out of the housing 10. The first external connector 51 is adapted to be electrically connected to an external control unit. On the one hand, the external control unit can supply power to the first control unit 50 using the first external connector 51, and on the other hand, signal transmission can be performed between the first control unit 50 and the external control unit.

[0125] In some embodiments, such as Figure 1 As shown, the circuit protection device 1 includes a housing 10, a conductive element 20 disposed in the housing 10, at least a portion of both ends of the conductive element 20 extending out of the housing 10 to transmit electrical signals, a detector 30 disposed inside the housing 10, and a portion of the first external connector 51 extending out of the housing 10 and electrically connected to an external control unit.

[0126] In some embodiments, the external control unit is the vehicle's battery management control unit. The conductive element 20 is used to direct the current in the vehicle's battery pack to the electrical device. The detector 30 is electrically connected to the conductive element 20 to detect the power-on signal of the conductive element 20. The detector 30 transmits the measured power-on signal of the conductive element 20 to the first control unit 50. The first control unit 50 can transmit the signal to the battery management control unit through the first external component 51, so that the battery management control unit can analyze the power-on signal of the conductive element 20 and thus analyze the charging and discharging status of the battery pack.

[0127] Furthermore, if the first control unit 50 malfunctions and the signal of the detector 30 reaches the first preset condition, the second control unit 7 can control the conductive element 20 to disconnect, which helps to improve the reliability of the circuit protection device 1.

[0128] The following describes a battery pack according to an embodiment of the present invention. The battery pack according to an embodiment of the present invention includes a second control unit 7 and a circuit protection device 1 according to the above embodiment of the present invention.

[0129] The second control unit 7 is used to control the conductive element 20 to disconnect under a second preset condition, so that when the second control unit 7 receives an abnormal signal, it can control the conductive element 20 to disconnect and cut off the current transmission on the conductive element 20, so as to prevent the conductive element 20 from continuing to transmit current under abnormal conditions.

[0130] Specifically, the second control unit 7 can control the conductive element 20 to disconnect under the second preset condition. When the first control unit 50 receives the signal from the detector 30 and the first preset condition is met, the first control unit 50 controls the conductive element 20 to disconnect. The second preset condition and the first preset condition can be different or the same.

[0131] Specifically, when the detector 30 communicates with the second control unit 7, the second preset condition includes the first preset condition, that is, when the electrical signal on the conductive element 20 is abnormal, both the second control unit 7 and the first control unit 50 can control the conductive element 20 to disconnect, so that when the first control unit 50 is abnormal, the second control unit 7 can control the conductive element 20 to disconnect, which helps to improve the safety of the battery pack.

[0132] The first preset condition includes a preset current value. When a short circuit or overcurrent occurs on the conductive component 20, the current will rise sharply in a very short time. When the current rises to the preset current value, the first control unit 50 is used to control the conductive component 20 to disconnect the transmission of electrical signals on the conductive component 20.

[0133] The first preset condition includes a preset temperature value. When a short circuit or overcurrent occurs in the current on the conductive element 20, the current will rise sharply in a very short time. The huge current will generate extremely high Joule heat. When the temperature reaches the preset temperature value, the first control unit 50 is used to control the conductive element 20 to disconnect the transmission of electrical signals on the conductive element 20.

[0134] The second preset condition includes situations such as abnormal battery pack temperature and battery pack thermal runaway.

[0135] Specifically, when the battery pack is used in toys, the second preset condition includes situations such as water ingress into the toy, to improve the safety of toy use. When the battery pack is used in vehicles, the second preset condition includes situations such as a vehicle collision, to promptly cut off current transmission, and to prevent the battery pack from catching fire or exploding.

[0136] According to the battery pack of the present invention, by utilizing the circuit protection device 1 of the present invention as described above, and by directly utilizing the first control unit 50 of the circuit protection device 1 itself to analyze the signal, it is easier to reduce the signal propagation path, improve the response speed of the circuit protection device 1, and thus disconnect the conductive element 20 in a timely manner when needed, thereby improving the safety of the current transmission of the conductive element 20.

[0137] In some embodiments of the present invention, such as Figure 3 As shown, the circuit protection device 1 also includes a fuse assembly 40, which includes a movable member 41. The fuse assembly 40 has a triggered state, in which the movable member 41 is used to cut off the conductive member 20.

[0138] The second control unit 7 is electrically connected to the fuse component 40. The second control unit 7 is used to control the fuse component 40 to switch to the trigger state under the second preset condition, so as to disconnect the conductive element 20 by the fuse component 40 under the second preset condition.

[0139] Specifically, the second control unit 7 is adapted to receive a signal indicating an abnormality in the battery pack under a second preset condition. At this time, the second control unit 7 controls the fuse component 40 to switch to the triggered state, so that the movable part 41 of the fuse component 40 moves to cut off the conductive part 20, thereby cutting off the current transmission on the conductive part 20, disconnecting the circuit, and thus protecting the safety of the electrical device connected to the circuit, thereby improving the safety of the circuit.

[0140] In some examples, the safety assembly 40 also includes an ignition tube 42 disposed between the movable member 41 and the first control unit 50. The end of the ignition tube 42 facing the first control unit 50 is provided with an electrical connector 421, which is electrically connected to the first control unit 50 and the second control unit 7.

[0141] Under the second preset condition, the second control unit 7 supplies current to the electrical connector 421. When the current flows through the ignition tube 42, an electric spark is formed inside the ignition tube 42, which then ignites the ignition tube 42. After the ignition tube 42 is ignited, a large amount of gas is generated, which pushes the movable part 41 toward the conductive part 20. The movable part 41 then cuts off the conductive part 20, disconnecting the transmission of electrical signals on the conductive part 20.

[0142] It should be explained here that the second control unit 7 is adapted to define the external control unit in the above embodiments.

[0143] In some alternative embodiments of the present invention, such as Figure 5 , Figure 8As shown, the battery pack transmits current through the conductive element 20. The battery pack also includes a sensor 8, which is used to detect the operating status parameters inside the battery pack. The sensor 8 communicates with the second control unit 7. The second preset condition includes the operating status parameters inside the battery pack reaching a set value. The second control unit 7 is used to control the fuse component 40 to switch to the trigger state when the operating status parameters inside the battery pack reach the set value, so that when the operating status parameters inside the battery pack are abnormal, the movable element 41 of the fuse component 40 can cut off the conductive element 20, disconnect the current transmission on the conductive element 20, and disconnect the power supply to the battery pack.

[0144] In some embodiments, the operating status parameters include the temperature and pressure inside the battery pack, so that when the temperature and pressure inside the battery pack are abnormal, the second control unit 7 can control the movement of the movable part 41 of the fuse assembly 40 to cut off the conductive part 20, disconnect the current transmission on the conductive part 20, and disconnect the power supply to the battery pack.

[0145] In some embodiments of the present invention, such as Figure 8 As shown, the second control unit 7 is electrically connected to the first control unit 50 so that signals from the first control unit 50 can be transmitted to the second control unit 7.

[0146] Specifically, the second control unit 7 is the vehicle's battery management control unit. Under the second preset conditions, the second control unit 7 can directly control the conductive component 20 to disconnect.

[0147] Meanwhile, the first control unit 50 can transmit signals to the second control unit 7, so that the second control unit 7 can analyze the electrical signal on the conductive component 20, and thus analyze the charging and discharging status of the battery pack.

[0148] In addition, the second preset condition includes the first preset condition. When the first control unit 50 malfunctions and the signal of the detector 30 reaches the first preset condition, the second control unit 7 can control the fuse component 40 to switch to the trigger state, so that the movable part 41 in the fuse component 40 can cut off the conductive part 20, which can improve the reliability of the circuit protection device 1.

[0149] The following describes an electrical device according to an embodiment of the present invention. The electrical device according to an embodiment of the present invention includes the battery pack described above, the battery pack transmitting electrical signals via conductive elements.

[0150] The electrical devices mentioned here can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0151] Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0152] In some embodiments, the electrical device is a vehicle, which may be a pure electric vehicle or a hybrid vehicle.

[0153] According to the embodiments of the present invention, the electrical device utilizes the battery pack of the present invention described above, and directly uses the first control unit 50 of the circuit protection device 1 itself to analyze the signal, thereby reducing the signal propagation path, improving the response speed of the circuit protection device 1, and thus timely disconnecting the conductive element 20 when needed, thereby improving the safety of the current transmission of the conductive element 20.

[0154] In some embodiments of the present invention, the electrical device further includes an airbag system 9, which is communicatively connected to a second control unit 7. The second preset condition includes the airbag system 9 detecting a vehicle collision. The second control unit 7 is used to control the conductive element 20 to disconnect the power supply to the battery pack when the airbag system 9 detects a vehicle collision.

[0155] Specifically, the electrical device is a vehicle. When a collision occurs, the airbag system 9 can transmit information to the second control unit 7. At this time, the second control unit 7 controls the conductive component 20 to disconnect the circuit, so as to prevent the battery pack from continuing to supply power when the vehicle is in a collision, thereby avoiding further danger.

[0156] Furthermore, the second control unit 7 is the vehicle's battery management control unit.

[0157] In some embodiments of the present invention, such as Figure 5 As shown, the circuit protection device 1 includes a fuse assembly 40, which includes a movable member 41. The fuse assembly 40 has a triggered state, in which the movable member 41 actively cuts off the conductive member 20.

[0158] The safety component 40 communicates with the second control unit 7. The airbag system 9 can transmit information to the second control unit 7. At this time, the second control unit 7 controls the safety component 40 to switch to the triggered state. The movable part 41 in the safety component 40 moves to disconnect the conductive part 20, so as to prevent the battery pack from continuing to supply power when the vehicle is involved in a collision, thereby avoiding further danger.

[0159] In some examples, the fuse assembly 40 communicates with the first control unit 50 and the second control unit 7, respectively. That is, the fuse assembly 40 can be controlled by the first control unit 50 and the second control unit 7. The fuse assembly 40 includes an ignition tube 42 and a movable member 41. When it is necessary to cut off the conductive member 20, the first control unit 50 or the second control unit 7 supplies current to the ignition tube 42. When the current flows through the ignition tube 42, an electric spark is formed in the ignition tube 42, which then ignites the ignition tube 42. After the ignition tube 42 is ignited, a large amount of gas is generated, which pushes the movable member 41 toward the conductive member 20, thereby cutting off the conductive member 20 by using the movable member 41.

[0160] Specifically, when the detector 30 detects an abnormal current on the conductive element 20, the first control unit 50 outputs current to the ignition tube 42, thereby driving the movable element 41 to move and cut off the conductive element 20. At the same time, the first control unit 50 transmits the signal detected by the separator to the second control unit 7.

[0161] When the airbag system 9 detects a collision, it transmits a signal to the second control unit 7, which outputs current to the ignition tube 42, thereby driving the movable part 41 to move and cut off the conductive part 20.

[0162] When sensor 8 detects that the operating status parameters in the battery pack have reached a preset value, sensor 8 transmits a signal to the second control unit 7. The second control unit 7 outputs current to the ignition tube 42, thereby driving the movable part 41 to move to cut off the conductive part 20.

[0163] Other configurations and operations of the electrical device according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0164] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0165] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0166] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0167] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0168] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, The battery pack transmits electrical signals through a conductive element (20), and the battery pack includes: A circuit protection device, comprising a housing (10), a detector (30), a first control unit (50), and a fuse assembly (40). The detector (30) is disposed within the housing (10) and is electrically connected to a conductive element (20) to detect electrical signals. The first control unit (50) is disposed within the housing (10) and is electrically connected to the detector (30). The fuse assembly (40) has a trigger state, in which the fuse assembly (40) is used to cut off the conductive element (20). The first control unit (50) is electrically connected to the fuse assembly (40) and is used to control the fuse assembly (40) to switch to the trigger state when the signal of the detector (30) reaches a first preset condition. The second control unit (7) is electrically connected to the insurance component (40). The second control unit (7) is used to control the insurance component (40) to switch to the trigger state under a second preset condition. The second control unit (7) communicates bidirectionally with the first control unit (50).

2. The battery pack according to claim 1, characterized in that, The circuit protection device also includes a connecting pin (35), the two ends of which are electrically connected to the detector (30) and the first control unit (50), respectively.

3. The battery pack according to claim 1, characterized in that, The safety component (40) includes a movable element (41) for cutting off the conductive element (20).

4. The battery pack according to claim 1, characterized in that, The safety component (40) includes an ignition tube (42) and an electrical connector (421) which is electrically connected to the first control unit (50).

5. The battery pack according to claim 4, characterized in that, Also includes: A second external component (60) electrically connected to the second control unit (7), and the second external component (60) electrically connected to the safety component (40).

6. The battery pack according to claim 5, characterized in that, The second external component (60) is disposed on the side of the first control unit (50) away from the safety component (40), and the electrical connector (421) passes through the first control unit (50). The electrical connector (421) is electrically connected to the first control unit (50) and the second external component (60) respectively.

7. The battery pack according to claim 5, characterized in that, The first control unit (50) is provided with a connection hole (52), and the second external component (60) is provided with a connection pin (61). The connection pin (61) passes through the connection hole (52) and is electrically connected to the first control unit (50) and the safety component (40).

8. The battery pack according to claim 1, characterized in that, The detector (30) includes a resistor terminal (31), and the conductive element (20) includes a first conductive part (201) and a second conductive part (202). The first conductive part (201) and the second conductive part (202) are arranged along the direction of current flow. The first end of the resistor terminal (31) is connected to the first conductive part (201), and the second end of the resistor terminal (31) is connected to the second conductive part (202).

9. The battery pack according to claim 8, characterized in that, The detector (30) further includes a sampling unit (32), which is electrically connected to the resistor terminal (31). The sampling unit (32) is used to sample the voltage difference across the resistor terminal (31). The sampling unit (32) is electrically connected to the first control unit (50).

10. The battery pack according to claim 9, characterized in that, The circuit protection device also includes a connecting pin (35), the two ends of which are electrically connected to the sampling unit (32) and the first control unit (50), respectively.

11. The battery pack according to claim 3, characterized in that, In the axial movement direction of the movable part (41), the first control unit (50) is located on the side of the safety assembly (40) opposite to the conductive part (20).

12. The battery pack according to claim 11, characterized in that, The conductive element (20) has a weak part (21) with a thickness less than the thickness of the rest of the conductive element (20). In the axial movement direction of the movable element (41), the projection of the movable element (41) overlaps at least partially with the projection of the weak part (21).

13. The battery pack according to claim 12, characterized in that, The movable part (41) is provided with a blade (411). In the axial movement direction of the movable part (41), the projection of the weak part (21) completely covers the projection of the blade (411). The blade (411) is used to cut off the weak part (21).

14. The battery pack according to claim 13, characterized in that, The weak part (21) includes two inclined surfaces (22) arranged in the first direction. One end of the two inclined surfaces (22) intersects to form a V-shaped structure. The first direction is perpendicular to the axial movement direction of the movable part (41).

15. The battery pack according to claim 3, characterized in that, The conductive element (20) is disposed on the housing (10), and at least a portion of both ends of the conductive element (20) extends out of the housing (10) to transmit electrical signals.

16. The battery pack according to claim 15, characterized in that, The housing (10) defines a receiving cavity (13), and the movable member (41) is movably disposed within the receiving cavity (13) and slides in cooperation with the side wall of the receiving cavity (13).

17. The battery pack according to claim 16, characterized in that, The receiving cavity (13) is a cylindrical chamber, and the movable part (41) is a cylindrical piston.

18. The battery pack according to claim 15, characterized in that, It also includes an arc-extinguishing device (66), which is disposed inside the housing (10). In the direction of axial movement of the movable member (41), the arc-extinguishing device (66) and the movable member (41) are located on both sides of the conductive member (20).

19. The battery pack according to claim 18, characterized in that, The housing (10) includes a first housing portion (101) and a second housing portion (102), the first control unit (50) and the safety component (40) are disposed in the first housing portion (101), and the arc extinguishing device (66) is disposed in the second housing portion (102).

20. The battery pack according to claim 19, characterized in that, In the extending direction of the conductive member (20), the second shell portion (102) is provided with a relief recess (12) opposite to the end of the first shell portion (101), and both ends of the conductive member (20) extend from the relief recess (12) to the outside of the shell (10).

21. The battery pack according to any one of claims 15-20, characterized in that, The first control unit (50) has a first external member (51) that extends at least partially out of the housing (10) and is adapted to be electrically connected to the second control unit (7).

22. The battery pack according to claim 1, characterized in that, Also includes: Sensor (8) is used to detect the operating status parameters in the battery pack. The sensor (8) communicates with the second control unit (7). The second preset condition includes the operating status parameters in the battery pack reaching a set value.

23. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1-22.

24. The electrical appliance according to claim 23, characterized in that, Also includes: The airbag system (9) is communicatively connected to the second control unit (7), and the second preset condition includes the airbag system detecting a vehicle collision.

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