Sampling assembly, electrical box, battery system and electric device

Abstract

The utility model discloses a sampling assembly, an electrical box, a battery system and an electric device. The sampling assembly comprises a metal connecting part which comprises a first connecting part, a second connecting part and a third connecting part; the first end of the sampling resistor part is connected with the first connecting part, and the second end of the sampling resistor part is connected with the first end of the second connecting part; the first end of the safety part is connected with the second connecting part, the second end of the safety part is connected with the third connecting part, and the safety part is configured to be capable of disconnecting electric connection between the second connecting part and the third connecting part. According to the embodiment of the invention, the sampling resistor part and the safety part can be integrated together, and the sampling component can realize a current sampling function on a high-voltage loop by using the sampling resistor part and can also realize a protection function of disconnecting the high-voltage loop by using the safety part, so that the size of the distribution box assembly is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a sampling component, electrical box, battery system and power supply device. Background Technology

[0002] The high-voltage circuit of a new energy power battery pack includes multiple components, such as relays, shunts, fuses, and pre-charge resistors. Generally, these components need to be housed in the battery distribution box assembly of the battery pack, which makes the distribution box assembly quite large. Utility Model Content

[0003] This application provides a sampling component, electrical box, battery system, and power supply device that integrates a sampling resistor and a fuse. The sampling component can both use the sampling resistor to sample the current of the high-voltage circuit and use the fuse to disconnect the high-voltage circuit, which helps to reduce the size of the distribution box assembly.

[0004] In a first aspect, this application provides a sampling component, including: a metal connection portion, including a first connection portion, a second connection portion and a third connection portion; a sampling resistor portion, the first end of which is connected to the first connection portion and the second end of which is connected to the first end of the second connection portion; a fuse portion, the first end of which is connected to the second connection portion and the second end of which is connected to the third connection portion, the fuse portion being configured to be able to disconnect the electrical connection between the second connection portion and the third connection portion.

[0005] The sampling component provided according to the embodiments of this application includes a sampling resistor and a fuse. The sampling resistor and the fuse are connected by a second connection. The first connection and the second connection can be used to connect the sampling component to other devices. The sampling resistor can be used as a sampling resistor in a shunt. By collecting the voltage across the sampling resistor, the current sampling function of the high-voltage circuit where the sampling component is located can be realized. The fuse can be used as the cut-off part in an active fuse structure. When the high-voltage circuit where the sampling component is located needs to be disconnected, the fuse can be cut off to realize the protection function of disconnecting the high-voltage circuit. That is to say, compared with the shunt and the active fuse being two separate devices, the embodiments of this application are equivalent to integrating the shunt and the active fuse together, which is beneficial to reducing the size of the power distribution box assembly.

[0006] In one possible implementation of the first aspect, the safety part, the second connecting part, and the third connecting part are an integral structure.

[0007] In this embodiment, the safety part, the second connecting part, and the third connecting part are designed as an integral structure, so that no other additional processes are required to connect the safety part with the second connecting part and the third connecting part, which is relatively simple in terms of process.

[0008] In one possible implementation of the first aspect, the surfaces of the safety part, the second connection part, and the third connection part have a height difference in the thickness direction of the sampling component.

[0009] In this embodiment, the fuse has a staggered height difference relative to the second and third connecting parts, which makes it easier to disconnect the fuse and thus ensure the protection function of the fuse for the high-voltage circuit where the sampling component is located.

[0010] In one possible implementation of the first aspect, the sampling assembly further includes a circuit board, the circuit board including a first sampling line and a second sampling line, the first sampling line being electrically connected to a first terminal of the sampling resistor section, and the second sampling line being electrically connected to a second terminal of the sampling resistor section.

[0011] In this embodiment of the application, the sampling component includes a circuit board, and the circuit board includes a first sampling line and a second sampling line. The first sampling line and the second sampling line can realize the electrical connection between the two ends of the sampling resistor and the sampling circuit, which facilitates the sampling circuit to collect the voltage at both ends of the sampling resistor.

[0012] In one possible implementation of the first aspect, the circuit board is located on one side of the sampling resistor section, and the circuit board also includes a thermistor.

[0013] In this embodiment, the thermistor is positioned close to the sampling resistor. Therefore, the temperature detected by the thermistor can be used to characterize the ambient temperature of the sampling resistor. The resistance value of the sampling resistor may change with temperature. Therefore, when the current temperature of the sampling resistor is detected, the current resistance value can be corrected based on the detected current temperature to obtain a more accurate resistance value, thereby ensuring the accuracy of the current value obtained based on the resistance value of the sampling resistor.

[0014] In one possible implementation of the first aspect, the sampling component further includes an actuating device that generates an explosion in response to a control signal to disconnect the safety unit.

[0015] In this embodiment, the sampling component integrates an execution device, so that when it is necessary to cut off the safety device, the cutting off can be performed directly using the execution device.

[0016] In one possible implementation of the first aspect, the actuator includes a housing connected to a second connection portion and a third connection portion, at least a portion of the safety portion is located inside the housing, and the housing is insulated.

[0017] In this embodiment, the actuator includes a housing, and a safety device is disposed inside the housing. This prevents other components from being damaged when the safety device is cut off, thereby improving the reliability of the sampling assembly.

[0018] In one possible implementation of the first aspect, the actuator includes an arc-extinguishing device disposed within a housing for absorbing the energy of an electric arc.

[0019] Based on the same technical concept, in a second aspect, embodiments of this application provide an electrical box including a sampling component as described in any embodiment of the first aspect.

[0020] Based on the same technical concept, in a third aspect, embodiments of this application provide a battery system, including:

[0021] Battery;

[0022] Battery Management Unit;

[0023] and the sampling component as described in any embodiment of the first aspect;

[0024] The sampling component is connected in series with the battery, and the sampling component is connected to the battery management unit through a first connector and a second connector.

[0025] In one possible implementation of the third aspect, the sampling component includes a circuit board, the circuit board including a first sampling line and a second sampling line, the first sampling line being electrically connected to a first end of a sampling resistor, and the second sampling line being electrically connected to a second end of a sampling resistor; a first connector is used to electrically connect the first sampling line and the second sampling line to the sampling circuit of the battery management unit.

[0026] The first sampling line and the second sampling line are connected to the two ends of the sampling resistor section respectively. The first connector is used to electrically connect the different input ends of the first sampling line and the second sampling line. In this way, the sampling circuit of the battery management unit is electrically connected to the sampling resistor section through the sampling line and the first connector in sequence, so that the sampling circuit can collect the voltage across the two ends of the sampling resistor section and then determine the current flowing through the sampling resistor section.

[0027] In one possible implementation of the third aspect, the battery management unit connects to the actuator of the sampling component via a second connector to control the fuse to disconnect.

[0028] The second connector can transmit control signals from the battery management unit to the actuator, thus actively disconnecting the fuse to protect the battery circuit.

[0029] Based on the same technical concept, in a fourth aspect, embodiments of this application provide an electrical device including a battery system as described in any embodiment of the third aspect.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0032] Figure 1 This is a top view of a sampling component according to an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the front view structure of a sampling component according to an embodiment of this application;

[0034] Figure 3 This is a top view of a sampling component according to another embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the front view structure of a sampling component according to another embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the front view structure of a sampling component according to another embodiment of this application;

[0037] Figure 6 This is a schematic diagram of the front view structure of a sampling component according to another embodiment of this application;

[0038] Figure 7 This is a schematic diagram showing the connection between a sampling component and a battery management unit according to an embodiment of this application;

[0039] Figure 8 This is a cross-sectional structural diagram of a sampling component according to another embodiment of this application. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

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

[0043] In the high-voltage circuit of new energy power battery packs, a combination of shunt and pyrofuse is generally required to realize the functions of current detection and pyrofuse interruption of the high-voltage circuit, respectively. Therefore, the shunt and pyrofuse need to be installed in the high-voltage box assembly.

[0044] In related technologies, the shunt and active fuse are designed as two separate devices, which makes the high-voltage box occupied by the shunt and active fuse relatively large, and also limits the layout of the devices in the high-voltage box.

[0045] To address the aforementioned technical problems, embodiments of this application provide a sampling component, an electrical box, a battery system, and a power supply device. The various embodiments of this application will be described below with reference to the accompanying drawings.

[0046] Figure 1 This is a top view of a sampling component according to an embodiment of this application. Figure 2 This is a front view structural diagram of a sampling component according to an embodiment of this application. Please refer to the reference. Figure 1 and Figure 2 The sampling component provided in this application embodiment includes a metal connection part 1, a sampling resistor part 2, and a fuse part 3.

[0047] The metal connection part 1 includes a first connection part 11, a second connection part 12 and a third connection part 13.

[0048] The sampling resistor 2 has its first end connected to the first connection part 11 and its second end connected to the first end of the second connection part 12.

[0049] The safety unit 3 has a first end connected to the second connecting part 12 and a second end connected to the third connecting part 13. The safety unit 3 is configured to disconnect the electrical connection between the second connecting part 12 and the third connecting part 13.

[0050] Understandably, the metal connection 1 is conductive and can be used to transmit electrical signals. For example, if the sampling component is located on the high-voltage circuit to which the battery is connected, the metal connection 1 can transmit current and / or voltage signals.

[0051] For example, the end of the first connecting portion 11 away from the sampling resistor portion 2 includes a first threaded hole 101, and the end of the third connecting portion 13 away from the safety portion 3 includes a second threaded hole 102. The first threaded hole 101 and the second threaded hole 102 are used to realize the connection between the sampling component and other devices. For example, the first threaded hole 101 and the second threaded hole 102 are used to install bolts, thereby realizing the connection between the sampling component and other devices.

[0052] For example, the material of the metal connector 1 includes, but is not limited to, copper, aluminum, etc. The first connector 11, the second connector 12, and the third connector 13 are all sheet-like structures. The metal connector 1 may be referred to as a palladium sheet or a busbar palladium sheet.

[0053] For example, the sampling resistor 2 includes an alloy resistor, which can be referred to as a metal alloy component. The resistance value of the sampling resistor 2 is constant. When a large current passes through the sampling resistor 2, a small voltage drop is generated across its terminals. By measuring this voltage drop, the current value passing through the sampling resistor 2 can be calculated.

[0054] For example, the sampling resistor 2 is connected to the first connection portion 11 and / or the second connection portion 12 by welding to ensure the connection stability between the sampling resistor 2 and the first connection portion 11 and / or the second connection portion 12. Of course, this is not intended to limit this application. In other examples, the sampling resistor 2 and the first connection portion 11 and / or the second connection portion 12 may also be connected by other means (e.g., by bonding with conductive adhesive).

[0055] For example, the material of the fuse part 3 is the same as that of the second connection part 12 and / or the third connection part 13. The fuse part 3 can be more easily disconnected compared to the second connection part 12 and the third connection part 13, thereby achieving the protection function of the high-voltage circuit where the sampling component is located. For instance, the fuse part 3 can be a relatively weak part compared to the second connection part 12 and the third connection part 13; when protection is required, the fuse part 3 will be broken, thereby cutting off the high-voltage circuit of the battery pack and providing protection.

[0056] In summary, the sampling component provided according to the embodiments of this application includes a sampling resistor and a fuse. The sampling resistor and the fuse are connected by a second connection. The first and second connection can be used to connect the sampling component to other devices. The sampling resistor can serve as a sampling resistor in a shunt. By collecting the voltage across the sampling resistor, the current sampling function of the high-voltage circuit where the sampling component is located can be realized. The fuse can serve as the cut-off part in an active fuse structure. When the high-voltage circuit where the sampling component is located needs to be disconnected, the fuse can be disconnected to realize the protection function of disconnecting the high-voltage circuit. That is to say, compared with the shunt and the active fuse being two separate devices, the embodiments of this application are equivalent to integrating the shunt and the active fuse together, which is beneficial to reducing the size of the power distribution box assembly.

[0057] In some embodiments, such as Figure 1 and Figure 2 As shown, the safety part 3, the second connecting part 12, and the third connecting part 13 are an integral structure. Here, "integrated structure" means that the safety part 3 is not separate from the second connecting part 12 and the third connecting part 13, and they do not need to be connected by welding, bonding or other means. The three are different areas of the same whole structure.

[0058] Understandably, in this embodiment, the safety part 3, the second connecting part 12, and the third connecting part 13 are made of the same material.

[0059] Furthermore, compared to the second connecting portion 12 and the third connecting portion 13, the fuse portion 3 still needs to satisfy the characteristic of being relatively easy to cut, so as to satisfy the function of protecting the high-voltage circuit when the fuse portion 3 is cut. For example, a palladium sheet with uniformity in each region can be integrally formed first, and then the middle region of this uniform palladium sheet can be "weakened." The "weakened" portion serves as the fuse portion 3, and the un-"weakened" portions serve as the second connecting portion 12 and the third connecting portion 13, respectively. In this document, "uniformity in each region" includes that the ease of cutting each region is the same.

[0060] In this embodiment, the safety part, the second connecting part, and the third connecting part are designed as an integral structure, so that no other additional processes are required to connect the safety part with the second connecting part and the third connecting part, which is relatively simple in terms of process.

[0061] In some embodiments, such as Figure 2 As shown, in the thickness direction Z of the sampling component, the surfaces of the safety part 3, the second connecting part 12, and the third connecting part 13 have a height difference. In other words, the safety part 3, the second connecting part 12, and the third connecting part 13 have a staggered height difference.

[0062] For example, the surface s31 of the safety part 3 is connected between the surface s11 of the second connecting part 12 and the surface s21 of the third connecting part 13. In the thickness direction Z of the sampling assembly, the surface s31 of the safety part 3, the surface s11 of the second connecting part 12, and the surface s21 of the third connecting part 13 have a height difference. The surface s32 of the safety part 3 is connected between the surface s12 of the second connecting part 12 and the surface s22 of the third connecting part 13. In the thickness direction Z of the sampling assembly, the surface s32 of the safety part 3, the surface s12 of the second connecting part 12, and the surface s22 of the third connecting part 13 have a height difference.

[0063] In this embodiment, the fuse is offset relative to the second and third connecting parts, so that the fuse can be easily disconnected, thereby ensuring the protection function of the fuse for the high-voltage circuit where the sampling component is located.

[0064] As an example, the thickness of the safety part 3 is less than the thickness of the second connecting part 12, and the thickness of the safety part 3 is less than the thickness of the third connecting part 13.

[0065] For example, the thickness of the second connecting portion 12 is equal to the thickness of the third connecting portion 13.

[0066] For example, a palladium sheet with uniformity in all regions can be integrally formed first. Then, the middle region of this uniform palladium sheet is "thinned." The thinned portion serves as the safety part 3, and the unthinned portions serve as the second connecting part 12 and the third connecting part 13, respectively. For example, as... Figure 2 As shown, in the thickness direction D1 of the sampling component, the safety part 3 is recessed downward relative to the second connecting part 12 and the third connecting part 13. In this example, the safety part 3 is obtained by "thinning" the middle region of the palladium sheet, and the thickness of the safety part 3 can vary in the direction D2 from the second connecting part 12 to the third connecting part 13.

[0067] In this example, the fuse part is thinner than the second and third connecting parts, which further ensures that the fuse part can be easily cut off, thereby ensuring the protection function of the fuse part for the high-voltage circuit where the sampling component is located.

[0068] Figure 3 This is a top view of a sampling component according to another embodiment of this application. Figure 4 This is a schematic front view of a sampling component according to another embodiment of this application. In some embodiments, please refer to... Figure 3 and Figure 4The sampling assembly also includes a circuit board 4, which includes a first sampling line 41 and a second sampling line 42. The first sampling line 41 is electrically connected to the first end of the sampling resistor section 2, and the second sampling line 42 is electrically connected to the second end of the sampling resistor section 2.

[0069] The first sampling line 41 is configured to transmit the voltage at the first terminal of the sampling resistor section 2. The second sampling line 42 is configured to transmit the voltage at the second terminal of the sampling resistor section 2. Exemplarily, the other ends of the first sampling line 41 and the second sampling line 42 are electrically connected to different input terminals of the sampling circuit of the battery management unit. The sampling circuit of the battery management unit is configured to acquire the voltage across the sampling resistor section 2 and determine the current flowing through the sampling resistor section 2 based on the voltage difference across the sampling resistor section 2 and the resistance value of the sampling resistor section 2. It is understood that when the sampling component is located in the high-voltage circuit, this current is the current flowing through the high-voltage circuit.

[0070] For example, circuit board 4 includes a printed circuit board (PCB). The first sampling line 41 and the second sampling line 42 are wrapped by the insulating layer of circuit board 4 to prevent the first sampling line 41 and the second sampling line 42 from being exposed on the surface of circuit board 4, thereby avoiding leakage.

[0071] As an example, the circuit board 4 is soldered to the first connection portion 11 and the second connection portion 12, thereby achieving electrical connection between the first sampling line 41 and the first end of the sampling resistor portion 2, and electrical connection between the second sampling line 42 and the second end of the sampling resistor portion 2. For example, Figure 5 As shown, the first connecting portion 11 has a first connecting area 111, which is located at one end of the first connecting portion 11 near the sampling resistor portion 2; the second connecting portion 12 has a second connecting area 122, which is located at one end of the second connecting portion 12 near the sampling resistor portion 2. The first connecting portion 11 is electrically connected to a first sampling line on the circuit board at the location of the first connecting area 111, and the second connecting portion 12 is electrically connected to a second sampling line on the circuit board at the location of the second connecting area 122. The first connecting area 111 may be elongated, the second connecting area 122 may be elongated, and the first connecting area 111 and the second connecting area 122 are parallel to each other.

[0072] In this embodiment of the application, the sampling component includes a circuit board, and the circuit board includes a first sampling line and a second sampling line. The first sampling line and the second sampling line can realize the electrical connection between the two ends of the sampling resistor and the sampling circuit, which facilitates the sampling circuit to collect the voltage at both ends of the sampling resistor.

[0073] In some embodiments, please refer to the reference Figure 4 and Figure 6The circuit board 4 is located on one side of the sampling resistor section 2, and the circuit board 4 also includes a thermistor 44.

[0074] The resistance of the thermistor 44 changes with temperature. Therefore, the thermistor 44 can be used to detect temperature. As an example, the thermistor 44 includes, but is not limited to, negative temperature coefficient thermistors (NTC). The number of thermistors 44 includes, but is not limited to, those with a negative temperature coefficient. Figure 6 One shown.

[0075] In this embodiment, the temperature-sensitive resistor 44 is disposed close to the sampling resistor section 2. Therefore, the temperature detected by the temperature-sensitive resistor 44 can be used to characterize the ambient temperature of the sampling resistor section 2.

[0076] The resistance value of the sampling resistor 2 may change with temperature. Therefore, when the current temperature of the sampling resistor 2 is detected, the current resistance value of the sampling resistor 2 can be corrected according to the detected current temperature, so as to obtain a more accurate resistance value of the sampling resistor 2, thereby ensuring the accuracy of the current value obtained based on the resistance value of the sampling resistor 2.

[0077] For example, a thermistor and Figure 7 The microcontroller unit (MCU) in the battery management unit (BMU) shown is electrically connected. The MCU can acquire the current resistance value of the temperature-sensitive resistor 44 and determine the current temperature of the sampling resistor section 2 based on the current resistance value of the temperature-sensitive resistor 44. In addition, the MCU's memory stores the correspondence between the temperature of the sampling resistor section 2 and its resistance value. Based on the detected current temperature of the sampling resistor section 2 and this correspondence, the MCU can determine the current resistance value of the sampling resistor section 2, and further determine the current current value flowing through the sampling resistor section 2 based on the voltage difference across the sampling resistor section 2 at the current moment and the current resistance value.

[0078] In some embodiments, please refer to the reference Figure 3 and Figure 4 The sampling assembly also includes an actuator 6, which generates an explosion in response to a control signal to disconnect the safety mechanism. Figure 3 and Figure 4 In the middle, the insurance department is blocked by the execution device 6.

[0079] For example, the actuator 6 may include a detonation actuator, which includes detonating fuel that, once detonated, can be used to cut off the safety mechanism.

[0080] Understandably, the fuse and the actuator constitute an active pyrofuse, which can be actively disconnected by the actuator. Unlike passive fuses, which can only provide protection under high current conditions, active fuses can disconnect the high-voltage circuit to which the fuse belongs in any situation requiring protection, using the actuator.

[0081] In this embodiment, the sampling component integrates an execution device, so that when it is necessary to cut off the safety device, the cutting off can be performed directly using the execution device.

[0082] In some embodiments, please refer to the reference Figure 3 and Figure 4 The actuator 6 includes a housing 61, which is connected to the second connecting part 12 and the third connecting part 13. The safety part is located inside the housing 61, and the housing 61 is insulated.

[0083] For example, housing 61 may have a different number of parts. The housing may be made of any suitable electrically insulating material. In some embodiments, the housing is made of plastic. For example, housing 61 may be a corresponding injection-molded part.

[0084] As an example, such as Figure 8 As shown, the housing 61 includes an upper body 611 and a lower body 612. A second connecting portion 12 and a third connecting portion 13 are sandwiched between the upper body 611 and the lower body 612. The upper body 611 and the lower body 612 form a cavity, and the safety part 3 is located within this cavity. In the event of a need for protection, the safety part 3 is cut off within this cavity to terminate any current flowing in the safety part 3.

[0085] In this embodiment, the actuator includes a housing, and a safety device is disposed inside the housing. This prevents other components from being damaged when the safety device is cut off, thereby improving the reliability of the sampling assembly.

[0086] In some embodiments, please refer to the reference Figure 3 and Figure 4 The actuator 6 is electrically connected to the battery management unit via the second connector 62 to control the fuse to disconnect. For example, the second connector 62 is used to receive an electrical signal output from the battery management unit and transmit it to the actuator 6 so that the actuator 6 disconnects the fuse.

[0087] For example, such as Figure 6 As shown, the second connector 62 may be provided with a first connection interface 621 and a second connection interface 622. The first connection interface 621 serves as a power supply pin, and the second connection interface 622 serves as a power supply reference ground pin. The second connector 62 may also be provided with a foolproof interface 623.

[0088] The first connection interface 621 and the second connection interface 622 can be coupled to the detonating fuel 63 via different leads 633, which, in this example, is located within the combustion chamber 64. In this example, the combustion chamber 64 is located within the upper body 611. For example, the detonating fuel can be positioned towards the inner end of the combustion chamber, wherein one or more openings are provided to accommodate leads extending from the housing. The safety part 3 is positioned against the opening of the combustion chamber to receive a cutting force from the combustion chamber and be cut off at at least one location.

[0089] In some embodiments, such as Figure 8 As shown, the actuator 6 also includes an arc-extinguishing device 65, which is disposed inside the housing 61 and is used to absorb the energy of the electric arc.

[0090] For example, the arc-extinguishing device 65 is located inside the lower main body 612. For instance, the arc-extinguishing device 65 is designed to suppress the formation of an electric arc when the fuse is cut off by the detonation configuration. This application does not limit the specific structural form of the arc-extinguishing device 65.

[0091] It should be noted that, Figure 8 The structure shown is merely an example and is not intended to limit this application.

[0092] Based on the same technical concept, this application also provides an electrical box, including the sampling component in any of the above embodiments. It is understood that the electrical box has the beneficial effects of the sampling component provided in this application embodiment; for details, please refer to the specific descriptions of the sampling component in the above embodiments, which will not be repeated here.

[0093] Based on the same technical concept, this application also provides a battery system, including: a battery, a battery management unit, and a sampling component as described in any of the above embodiments; wherein the sampling component is connected in series with the battery, and the sampling component is connected to the battery management unit through a first connector and a second connector. It is understood that the battery system has the beneficial effects of the sampling component provided in this application embodiment; for details, please refer to the specific descriptions of the sampling component in the above embodiments, which will not be repeated here.

[0094] In some embodiments, such as Figure 6 As shown, the first connector 43 is used to connect the first sampling line ( Figure 6 (not shown in the image) and the second sampling line ( Figure 6 (not shown in the image) and the sampling circuit of the battery management unit (BMU) Figure 6 Electrical connections are made to different input terminals (not shown in the diagram).

[0095] As described above, the first sampling line and the second sampling line are connected to the two ends of the sampling resistor section respectively. The first connector is used to electrically connect the different input ends of the first sampling line and the second sampling line. In this way, the sampling circuit is electrically connected to the sampling resistor section through the sampling line and the first connector in sequence, so that the sampling circuit can collect the voltage across the two ends of the sampling resistor section and then determine the current flowing through the sampling resistor section.

[0096] For example, the first connector 43 includes a plug-in connector. The BMU circuit board and the circuit board 4 are two circuit boards. The first connector 43 and the circuit board 4 can be connected by a plug-in connector. When the sampling component is applied to the high-voltage circuit, the sampling component is located inside the high-voltage box, and the circuit board 4 can be understood as the circuit board on the high-voltage side. The circuit board of the BMU is located outside the high-voltage box, and the circuit board of the sampling circuit can be understood as the circuit board on the low-voltage side.

[0097] As an example, such as Figure 7 As shown, the sampling circuit of the battery management unit (BMU) includes a signal conditioning circuit 5, an analog-to-digital converter (ADC), and a microcontroller unit (MCU).

[0098] The input terminals of the signal conditioning circuit 5 are electrically connected to the first and second terminals of the sampling resistor section 2 via the first sampling line 41 and the second sampling line 42, respectively. The output terminal of the signal conditioning circuit is connected to the input terminal of the ADC; the output terminal of the ADC is connected to the MCU.

[0099] Signal conditioning circuit 5 is used to filter and / or amplify the signal. The ADC is used to convert analog signals into digital signals, such as voltage values ​​represented digitally. The MCU calculates the current flowing through sampling resistor 2 based on the ADC's output signal and the resistance value of sampling resistor 2.

[0100] For example, the configuration of the signal conditioning circuit 5 can be designed to match the characteristics of the ADC. For instance, the amplification factor of the signal conditioning circuit 5 can be designed according to the detection accuracy of the ADC; or the filtering parameters of the signal conditioning circuit 5 can be designed according to the sampling frequency of the ADC; and so on.

[0101] Based on the same technical concept, this application also provides an electrical device. The electrical device includes a battery system, and the battery system includes the sampling component in any of the above embodiments. It is understood that the electrical device has the beneficial effects of the sampling component provided in the embodiments of this application. For details, please refer to the specific descriptions of the sampling component in the above embodiments, which will not be repeated here.

[0102] It should be noted that in the above embodiments, the resistor is presented as a single resistor. In other embodiments, the resistor may also be an integrated combination of series, parallel, or mixed resistors. Similarly, in the above embodiments, the capacitor is presented as a single capacitor. In other embodiments, the capacitor may also be an integrated combination of series, parallel, or mixed capacitors. The specific parameters of each device can be set according to actual needs, and this application does not limit this.

[0103] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0104] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 sampling component, characterized in that, include: The metal connection portion includes a first connection portion, a second connection portion, and a third connection portion; The sampling resistor has a first end connected to the first connection part and a second end connected to the first end of the second connection part. A safety device, the first end of which is connected to the second connection part, and the second end of which is connected to the third connection part, is configured to disconnect the electrical connection between the second connection part and the third connection part.

2. The sampling component according to claim 1, characterized in that, The safety part, the second connecting part, and the third connecting part are an integral structure.

3. The sampling component according to claim 2, characterized in that, In the thickness direction of the sampling component, the surface of the safety part and the surfaces of the second and third connecting parts have a height difference.

4. The sampling component according to any one of claims 1 to 3, characterized in that, The sampling component further includes a circuit board, which includes a first sampling line and a second sampling line. The first sampling line is electrically connected to a first end of the sampling resistor section, and the second sampling line is electrically connected to a second end of the sampling resistor section.

5. The sampling component according to claim 4, characterized in that, The circuit board is located on one side of the sampling resistor section, and the circuit board also includes a thermistor.

6. The sampling component according to any one of claims 1 to 3, characterized in that, The sampling component also includes an actuator that generates an explosion in response to a control signal to disconnect the safety device.

7. The sampling component according to claim 6, characterized in that, The actuator includes a housing, which is connected to the second connecting part and the third connecting part. The safety part is located inside the housing, and the housing is insulated.

8. The sampling component according to claim 7, characterized in that, The actuator includes an arc-extinguishing device disposed within the housing for absorbing the energy of the electric arc.

9. An electrical box, characterized in that, Includes the sampling component as described in any one of claims 1 to 8.

10. A battery system, characterized in that, include: Battery; Battery Management Unit; And the sampling component as described in any one of claims 1-8; The sampling component is connected in series with the battery, and the sampling component is connected to the battery management unit through a first connector and a second connector.

11. The battery system according to claim 10, characterized in that, The sampling component includes a circuit board, the circuit board includes a first sampling line and a second sampling line, the first sampling line is electrically connected to a first terminal of the sampling resistor, and the second sampling line is electrically connected to a second terminal of the sampling resistor. The first connector is used to electrically connect the first sampling line and the second sampling line to the sampling circuit of the battery management unit.

12. The battery system according to claim 10, characterized in that, The battery management unit is connected to the actuator of the sampling component via the second connector to control the fuse to disconnect.

13. An electrical appliance, characterized in that, Includes the battery system as described in any one of claims 10-12.

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