Switching circuit and energy storage device

Abstract

The application discloses a switching circuit and an energy storage device, and belongs to the battery field.The switching circuit comprises a main positive loop, a main negative loop, a first switching subcircuit and a second switching subcircuit.The two ends of the first switching subcircuit are connected with a positive input interface and a positive output interface in the main positive loop respectively.The second switching subcircuit is connected with a negative input interface and a negative output interface in the main negative loop respectively.The switching circuit further comprises a first voltage detection subcircuit, and / or at least one of the first switching subcircuit and the second switching subcircuit comprises a switching voltage detection subcircuit.One end of the first voltage detection subcircuit is connected with a part of the main positive loop between the first switching subcircuit and the positive output interface, and the other end is connected with a part of the main negative loop between the second switching subcircuit and the negative output interface.The first voltage detection subcircuit and the switching voltage detection subcircuit can enrich the detection mode, so that the reliability of the switching circuit detection is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a switching circuit and an energy storage device. Background Technology

[0002] Switching circuits are circuits that control the on / off state of control elements to achieve power supply control, safety protection, and load switching. They play a crucial role in ensuring normal circuit operation, isolating faults, and optimizing energy management. Therefore, it is necessary to monitor the status of switching circuits to ensure their proper functioning.

[0003] Currently, the methods for state detection in switching circuits are limited, resulting in low reliability of state detection. Utility Model Content

[0004] This application provides a switching circuit and an energy storage device. It solves the problem of low reliability in the state detection of switching circuits in the prior art. The technical solution is as follows:

[0005] In a first aspect, a switching circuit is provided, comprising: a main positive circuit, a main negative circuit, a first switching sub-circuit, and a second switching sub-circuit;

[0006] The main positive circuit has a positive input interface and a positive output interface; the first switch sub-circuit is located between the positive input interface and the positive output interface, and the two ends of the first switch sub-circuit are respectively connected to the positive input interface and the positive output interface;

[0007] The main negative circuit has a negative input interface and a negative output interface; the second switch sub-circuit is located between the negative input interface and the negative output interface, and the second switch sub-circuit is connected to the negative input interface and the negative output interface respectively;

[0008] The switching circuit further includes: a first voltage detection sub-circuit, and / or, at least one of the first switching sub-circuit and the second switching sub-circuit includes a switching voltage detection sub-circuit;

[0009] Wherein, one end of the first voltage detection sub-circuit is connected to the portion of the main positive circuit located between the first switch sub-circuit and the positive output interface, and the other end is connected to the portion of the main negative circuit located between the second switch sub-circuit and the negative output interface.

[0010] Optionally, the switching circuit further includes: a second voltage detection sub-circuit;

[0011] One end of the second voltage detection sub-circuit is connected to the portion of the main positive circuit located between the first switch sub-circuit and the positive input interface, and the other end is connected to the portion of the main negative circuit located between the second switch sub-circuit and the negative input interface;

[0012] Wherein, if the switching circuit includes the second voltage detection sub-circuit, the switching circuit includes the first voltage detection sub-circuit.

[0013] Optionally, the first switching sub-circuit includes: a main positive relay and a third voltage detection sub-circuit;

[0014] The main positive relay is located between the positive input interface and the positive output interface, and both ends of the main positive relay are connected to the positive input interface and the positive output interface, respectively.

[0015] The main positive relay has a positive feedback contact, one end of the third voltage detection sub-circuit is connected to the positive feedback contact, and the other end is used to connect to the power supply; the third voltage detection sub-circuit is the switching voltage detection sub-circuit.

[0016] Optionally, the first switching sub-circuit further includes: a pre-charge relay and a pre-charge resistor;

[0017] One end of the precharge relay is connected to the positive input interface, and the other end is connected to one end of the precharge resistor; the other end of the precharge resistor is connected to the positive output interface.

[0018] Optionally, the second switching sub-circuit includes: a main negative relay and a fourth voltage detection sub-circuit;

[0019] The main negative relay is located between the negative input interface and the negative output interface, and both ends of the main negative relay are connected to the negative input interface and the negative output interface, respectively.

[0020] The main negative relay has a negative feedback contact, one end of the fourth voltage detection sub-circuit is connected to the negative feedback contact, and the other end is used to connect to the power supply; the fourth voltage detection sub-circuit is the switching voltage detection sub-circuit.

[0021] Optionally, the switching circuit further includes a shunt; the shunt is located between the second switching sub-circuit and the negative input interface, and the two ends of the shunt are respectively connected to the second switching sub-circuit and the negative input interface;

[0022] The connection point between the second voltage detection sub-circuit and the main negative circuit is closer to the negative input interface than the shunt.

[0023] Optionally, the switching circuit further includes: a first fuse and a second fuse;

[0024] The first fuse is located between the positive input interface and the first switch sub-circuit, and both ends of the first fuse are connected to the positive input interface and the first switch sub-circuit, respectively.

[0025] The second fuse is located between the shunt and the second switching sub-circuit, and both ends of the second fuse are connected to the shunt and the second switching sub-circuit, respectively.

[0026] The connection point between the second voltage detection sub-circuit and the main positive circuit is closer to the positive input interface than the first fuse.

[0027] Optionally, the switching circuit further includes: a first disconnect switch and a second disconnect switch;

[0028] The first isolating switch is located between the positive output interface and the first switch sub-circuit, and the two ends of the first isolating switch are respectively connected to the positive output interface and the first switch sub-circuit;

[0029] The second isolating switch is located between the negative output interface and the second switch sub-circuit, and the two ends of the second isolating switch are respectively connected to the negative output interface and the second switch sub-circuit;

[0030] Specifically, the connection point between the first voltage detection sub-circuit and the main positive circuit is further away from the positive output interface than the first isolating switch, and the connection point between the first voltage detection sub-circuit and the main negative circuit is further away from the negative output interface than the second isolating switch.

[0031] In a second aspect, an energy storage device is provided, comprising: a battery cluster, a battery management system, and a switching circuit as described above;

[0032] The two ends of the battery cluster are respectively connected to the positive input interface and the negative input interface in the switching circuit;

[0033] The battery management system is connected to the first switch sub-circuit and the second switch sub-circuit, respectively.

[0034] Optionally, when the switching circuit includes a first voltage detection sub-circuit, a second voltage detection sub-circuit, a third voltage detection sub-circuit, and a fourth voltage detection sub-circuit, at least one of the first voltage detection sub-circuit, the second voltage detection sub-circuit, the third voltage detection sub-circuit, and the fourth voltage detection sub-circuit is integrated into the battery management system.

[0035] The beneficial effects of the technical solutions provided in this application include at least the following:

[0036] Because the switching circuit includes a first voltage detection sub-circuit, with one end connected to the portion of the main positive circuit located between the first switching sub-circuit and the positive output interface, and the other end connected to the portion of the main negative circuit located between the second switching sub-circuit and the negative output interface, the first voltage detection sub-circuit can detect a voltage signal when the switching circuit is closed. The detected voltage signal indicates that both the first and second switching sub-circuits are normally closed. Conversely, if the first voltage detection sub-circuit does not detect a voltage signal, it indicates that at least one of the first and second switching sub-circuits is abnormally closed. Thus, by placing the first voltage detection sub-circuit relatively close to the positive and negative output interfaces, the state of the switching circuit can be detected quickly and accurately.

[0037] When at least one of the first and second switching sub-circuits has a switching voltage detection sub-circuit, if the switching circuit is closed and the switching voltage detection sub-circuit can detect a voltage signal, the detected voltage signal indicates that the corresponding switching sub-circuit is in a closed state. Conversely, if the switching voltage detection sub-circuit does not detect a voltage signal, it indicates that the corresponding switching sub-circuit is in an abnormal closing state. Thus, the state of the corresponding switching sub-circuit can be accurately detected through the switching voltage detection sub-circuit.

[0038] That is, the switching circuit in this application can perform switching circuit state detection by at least one of the first voltage detection sub-circuit and the switching voltage detection sub-circuit, thus enriching the switching circuit state detection methods and improving the reliability of state detection.

[0039] Furthermore, using both the first voltage detection sub-circuit and the switch voltage detection sub-circuit simultaneously for switch circuit status detection not only improves the reliability of status detection but also facilitates fault diagnosis and maintenance. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of a switching circuit structure provided in an embodiment of this application;

[0042] Figure 2 This is a schematic diagram of another switching circuit structure provided in an embodiment of this application;

[0043] Figure 3 This is a schematic diagram of another switching circuit structure provided in the embodiments of this application;

[0044] Figure 4 This is a schematic diagram of another switching circuit structure provided in the embodiments of this application;

[0045] Figure 5 This is a schematic diagram of an energy storage device structure provided in an embodiment of this application;

[0046] Figure 6 This is a schematic diagram of a battery management system structure provided in an embodiment of this application;

[0047] Figure 7 This is a schematic diagram of another energy storage device structure provided in an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0049] The switching circuit described in this application, exemplified by one in a high-voltage box, is a switching circuit.

[0050] Currently, the switching circuit testing in the high-voltage box of the battery system mainly involves detecting the closed state of the relays, and relay testing relies on the relay's feedback contacts. Since the relay's feedback contacts are mechanical components, they wear down during frequent switching operations, leading to unreliability or low reliability.

[0051] Furthermore, the feedback contact detection method cannot detect asynchronous opening and closing of relays. For example, if the feedback point of the relay fails, the relay may open and close normally, but the response will be slow, affecting the effectiveness of the detection and making it impossible to respond in a timely manner to abnormal switching circuit conditions.

[0052] Based on this, this application proposes a switching circuit that can improve the reliability of switching circuit state detection.

[0053] Figure 1 This is a schematic diagram of a switching circuit structure provided in an embodiment of this application. Please refer to it. Figure 1 One embodiment of this application provides a switching circuit 000, including: a main positive circuit Z1, a main negative circuit Z2, a first switching sub-circuit 010, and a second switching sub-circuit 020.

[0054] The main positive circuit Z1 has a positive input interface B+ and a positive output interface B-. The first switch sub-circuit 010 is located between the positive input interface B+ and the positive output interface B-, and the two ends of the first switch sub-circuit 010 are connected to the positive input interface B+ and the positive output interface B-, respectively.

[0055] The main negative circuit Z2 has a negative input interface P+ and a negative output interface P-. The second switch sub-circuit 020 is located between the negative input interface P+ and the negative output interface P-, and is connected to both the negative input interface P+ and the negative output interface P-.

[0056] The switching circuit further includes: a first voltage detection sub-circuit 030, and / or, at least one of the first switching sub-circuit 010 and the second switching sub-circuit 020 includes a switching voltage detection sub-circuit 050.

[0057] One end of the first voltage detection sub-circuit 030 is connected to the portion of the main positive circuit Z1 located between the first switch sub-circuit 010 and the positive output interface B-, and the other end is connected to the portion of the main negative circuit Z2 located between the second switch sub-circuit 020 and the negative output interface P-.

[0058] In summary, because the switching circuit includes a first voltage detection sub-circuit, with one end connected to the portion of the main positive circuit located between the first switching sub-circuit and the positive output interface, and the other end connected to the portion of the main negative circuit located between the second switching sub-circuit and the negative output interface, the first voltage detection sub-circuit can detect a voltage signal when the switching circuit is closed. The detected voltage signal indicates that both the first and second switching sub-circuits are normally closed. Conversely, if the first voltage detection sub-circuit does not detect a voltage signal, it indicates that at least one of the first and second switching sub-circuits is abnormally closed. Thus, by placing the first voltage detection sub-circuit relatively close to the positive and negative output interfaces, the state of the switching circuit can be detected quickly and accurately.

[0059] When at least one of the first and second switching sub-circuits has a switching voltage detection sub-circuit, if the switching circuit is closed and the switching voltage detection sub-circuit can detect a voltage signal, the detected voltage signal indicates that the corresponding switching sub-circuit is in a closed state. Conversely, if the switching voltage detection sub-circuit does not detect a voltage signal, it indicates that the corresponding switching sub-circuit is in an abnormal closing state. Thus, the state of the corresponding switching sub-circuit can be accurately detected through the switching voltage detection sub-circuit.

[0060] That is, the switching circuit in this application can perform switching circuit state detection by at least one of the first voltage detection sub-circuit and the switching voltage detection sub-circuit, thus enriching the switching circuit state detection methods and improving the reliability of state detection.

[0061] Furthermore, using both the first voltage detection sub-circuit and the switch voltage detection sub-circuit simultaneously for switch circuit status detection not only improves the reliability of status detection but also facilitates fault diagnosis and maintenance.

[0062] It is understandable that the corresponding switch sub-circuits are the first switch sub-circuit 010 and the second switch sub-circuit 020.

[0063] Figure 2 This is a schematic diagram of another switching circuit structure provided in an embodiment of this application. Please refer to it. Figure 2 In some possible implementations, the switching circuit 000 further includes a second voltage detection sub-circuit 040. One end of the second voltage detection sub-circuit 040 is connected to the portion of the main positive circuit Z1 located between the first switching sub-circuit 010 and the positive input interface B+, and the other end is connected to the portion of the main negative circuit Z2 located between the second switching sub-circuit 020 and the negative input interface P+.

[0064] In the case where the switching circuit 000 includes a second voltage detection sub-circuit 040, the switching circuit 000 also includes a first voltage detection sub-circuit 030.

[0065] For example, a battery pack can be connected between the positive input interface B+ and the negative input interface P+ in the switching circuit 000, and a load can be connected between the positive output interface B- and the negative output interface P- in the switching circuit 000. In this case, since one end of the second voltage detection sub-circuit 040 is connected to the portion of the main positive circuit Z1 located between the first switching sub-circuit 010 and the positive input interface B+, and the other end is connected to the portion of the main negative circuit Z2 located between the second switching sub-circuit 020 and the negative input interface P+, ​​the second voltage detection sub-circuit 040 can detect the voltage corresponding to the battery pack.

[0066] When switch circuit 000 is closed, the voltage between first switch sub-circuit 010 and positive output interface B- and between second switch sub-circuit 020 and negative output interface P- can be detected by first voltage detection sub-circuit 030. If the voltage values ​​detected by first voltage detection sub-circuit 030 and second voltage detection sub-circuit 040 are similar or within a preset range, for example, the voltage difference detected by first voltage detection sub-circuit 030 and second voltage detection sub-circuit 040 is about 3V (at which time the voltage of the battery pack is, for example, 1500V), then switch circuit 000 can be determined to be in a normal closed state. If the voltage values ​​detected by first voltage detection sub-circuit 030 and second voltage detection sub-circuit 040 differ significantly, then switch circuit 000 can be determined to be in an abnormal state, and fault diagnosis and repair can be carried out in a timely manner.

[0067] By cooperating with the second voltage detection sub-circuit 040 and the first voltage detection sub-circuit 030, the reliability of the switching circuit 000 detection can be effectively improved.

[0068] In some other possible implementations, if the power supply connected between the positive input interface B+ and the negative input interface P+ in the switching circuit 000 is a constant voltage power supply, then the second voltage detection sub-circuit 040 is not required, and the first voltage detection sub-circuit 030 is sufficient to detect whether the switching circuit 000 is properly closed. Whether to add the second voltage detection sub-circuit 040 depends on actual needs; this application does not impose specific restrictions on this.

[0069] Figure 3 This is a schematic diagram of another switching circuit structure provided in the embodiments of this application. Please refer to it. Figure 3 In some possible implementations, the first switching sub-circuit 010 includes: a main positive relay KM1 and a third voltage detection sub-circuit 011.

[0070] The main positive relay KM1 is located between the positive input interface B+ and the positive output interface B-, and its two ends are connected to the positive input interface B+ and the positive output interface B-, respectively.

[0071] Among them, the main positive relay KM1 has a positive feedback contact, one end of the third voltage detection sub-circuit 011 is connected to the positive feedback contact, and the other end is used to connect to the first power supply 012. At this time, the third voltage detection sub-circuit 011 can be a switch voltage detection sub-circuit 050, that is, at least the first switch sub-circuit 010 includes a switch voltage detection sub-circuit 050.

[0072] One end of the third voltage detection subcircuit 011 is connected to the positive feedback contact, and the other end is connected to the first power supply 012. When the main positive relay KM1 is closed, the first power supply 012, the positive feedback contact, and the third voltage detection subcircuit 011 are connected, meaning the third voltage detection subcircuit 011 can detect the voltage signal corresponding to the first power supply 012. For example, if the first power supply 012 is 24V, after the main positive relay KM1 is closed, the third voltage detection subcircuit 011 can detect a 24V voltage signal. Thus, the normal closure of the main positive relay KM1 can be detected based on the voltage signal detected by the third voltage detection subcircuit 011. When the main positive relay KM1 is open, the corresponding positive feedback contact of the main positive relay KM1 is open, and the connection between the third voltage detection subcircuit 011 and the first power supply 012 is broken, allowing the detection of the open main positive relay KM1.

[0073] By combining the third voltage detection sub-circuit 011 with the positive feedback contact of the main positive relay KM1 in the first switch sub-circuit 010, the closing status of the main positive relay KM1 in the first switch sub-circuit 010 can be detected. At the same time, by combining the first voltage detection sub-circuit 030 and the second voltage detection sub-circuit 040, the closing status of the main positive relay KM1 in the first switch sub-circuit 010 can also be detected. That is, by using two methods, the closing status of the main positive relay KM1 in the first switch sub-circuit 010 can be detected simultaneously, which effectively improves the reliability of the detection of the switch circuit 000.

[0074] Please continue to refer to this. Figure 3 In some possible implementations, the first switch sub-circuit 010 further includes a precharge relay KM0 and a precharge resistor R.

[0075] One end of the precharge relay KM0 is connected to the positive input interface B+, and the other end is connected to one end of the precharge resistor R. The other end of the precharge resistor R is connected to the positive output interface B-. That is, the precharge relay KM0 and the precharge resistor R, which are connected in series, are connected in parallel with the first switch sub-circuit 010.

[0076] By setting a pre-charge relay KM0 and a pre-charge resistor R, the surge current can be limited by the pre-charge resistor R when the switch circuit 000 is closed, thus avoiding direct impact on the main positive relay KM1 and protecting the main positive relay KM1.

[0077] Please continue to refer to this. Figure 3 In some possible implementations, the second switching sub-circuit 020 includes: a main negative relay KM2 and a fourth voltage detection sub-circuit 021.

[0078] The main negative relay KM2 is located between the negative input interface P+ and the negative output interface P-, and its two ends are connected to the negative input interface P+ and the negative output interface P-, respectively.

[0079] Among them, the main negative relay KM2 has a negative feedback contact. One end of the fourth voltage detection sub-circuit 021 is connected to the negative feedback contact, and the other end is used to connect to the second power supply 022. At this time, the fourth voltage detection sub-circuit 021 can be a switch voltage detection sub-circuit 050, that is, at least the second switch sub-circuit 020 includes a switch voltage detection sub-circuit 050.

[0080] It should be noted that while the second switching sub-circuit 020 includes the fourth voltage detection sub-circuit 021, the first switching sub-circuit 010 may include the third voltage detection sub-circuit 011. That is, the switching voltage detection sub-circuit 050 can be configured as two: one is the third voltage detection sub-circuit 011, and the other is the fourth voltage detection sub-circuit 021. The two switching voltage detection sub-circuits 050 are distinguished by the third voltage detection sub-circuit 011 and the fourth voltage detection sub-circuit 021, so as to clearly identify the switching voltage detection sub-circuit 050 corresponding to the switching sub-circuit.

[0081] One end of the fourth voltage detection sub-circuit 021 is connected to the negative feedback contact, and the other end is used to connect to the second power supply 022. When the main negative relay KM2 is closed, the second power supply 022, the negative feedback contact, and the fourth voltage detection sub-circuit 021 are connected, meaning the fourth voltage detection sub-circuit 021 can detect the voltage signal corresponding to the second power supply 022. For example, if the second power supply 022 is 24V, after the main negative relay KM2 is closed, the fourth voltage detection sub-circuit 021 can detect a 24V voltage signal. Thus, the normal closure of the main negative relay KM2 can be detected based on the voltage signal detected by the fourth voltage detection sub-circuit 021. When the main negative relay KM2 is open, the corresponding negative feedback contact of the main negative relay KM2 is open. At this time, the fourth voltage detection sub-circuit 021 and the second power supply 022 are disconnected, and the opening of the main negative relay KM2 can be detected.

[0082] By combining the fourth voltage detection sub-circuit 021 with the negative feedback contact of the main negative relay KM2 in the second switch sub-circuit 020, the closing status of the main negative relay KM2 in the second switch sub-circuit 020 can be detected. At the same time, by combining the first voltage detection sub-circuit 030 and the second voltage detection sub-circuit 040, the closing status of the main negative relay KM2 in the second switch sub-circuit 020 can also be detected. That is, by using two methods, the closing status of the main negative relay KM2 in the second switch sub-circuit 020 can be detected simultaneously, effectively improving the reliability of the detection of the switch circuit 000.

[0083] Figure 4 This is a schematic diagram of another switching circuit structure provided in the embodiments of this application. Please refer to it. Figure 4 In some possible implementations, the switching circuit 000 further includes a shunt RS. The shunt RS is located between the second switching sub-circuit 020 and the negative input interface P+, ​​and the two ends of the shunt RS are connected to the second switching sub-circuit 020 and the negative input interface P+, ​​respectively.

[0084] Among them, the connection point between the second voltage detection sub-circuit 040 and the main negative circuit Z2 is closer to the negative input interface P+ than the shunt RS.

[0085] By incorporating a shunt RS into the switching circuit 000, the switching circuit 000 can be effectively monitored and protected. The shunt RS, located between the second switching sub-circuit 020 and the negative input interface P+, ​​ensures that all charging and discharging currents pass through it, allowing for better monitoring and protection of the switching circuit 000. The connection point between the second voltage detection sub-circuit 040 and the main negative circuit Z2 is closer to the negative input interface P+ than the shunt RS, reducing interference from other components and enabling the second voltage detection sub-circuit 040 to effectively detect the voltage signal between the positive input interface B+ and the negative input interface P+.

[0086] Please continue to refer to this. Figure 4 In some possible implementations, the switching circuit 000 further includes: a first fuse FU1 and a second fuse FU2.

[0087] The first fuse FU1 is located between the positive input interface B+ and the first switch sub-circuit 010, and the two ends of the first fuse FU1 are connected to the positive input interface B+ and the first switch sub-circuit 010 respectively.

[0088] The second fuse FU2 is located between the shunt RS and the second switch sub-circuit 020, and the two ends of the second fuse FU2 are connected to the shunt RS and the second switch sub-circuit 020 respectively.

[0089] Among them, the connection point between the second voltage detection sub-circuit 040 and the main positive circuit Z1 is closer to the positive input interface B+ than the first fuse FU1.

[0090] The first fuse FU1 can blow when the current in the main positive circuit Z1 exceeds the rated value, protecting the main positive circuit Z1 from overcurrent damage. The second fuse FU2 can blow when the current in the main negative circuit Z2 exceeds the rated value, protecting the main negative circuit Z2 from overcurrent damage. The connection point between the second voltage detection sub-circuit 040 and the main positive circuit Z1 is closer to the positive input interface B+ than the first fuse FU1, which reduces interference from other electrical components to the second voltage detection sub-circuit 040, allowing it to effectively detect the voltage signal between the positive input interface B+ and the negative input interface P+.

[0091] Since no electrical components are installed between one end of the second voltage detection sub-circuit 040 and the connection point of the main positive circuit Z1 and the positive input interface B+, and no electrical components are installed between the other end of the second voltage detection sub-circuit 040 and the connection point of the main negative circuit Z2 and the negative input interface P+, ​​it is equivalent to the second voltage detection sub-circuit 040 being directly connected to the positive input interface B+ and the negative input interface P+ respectively. In this way, the second voltage detection sub-circuit 040 can always detect the voltage signal of the power supply connected between the positive input interface B+ and the negative input interface P+, ​​and can ensure the accuracy of the detected voltage signal.

[0092] Please continue to refer to this. Figure 4 In some possible implementations, the switching circuit 000 further includes: a first isolating switch QS1 and a second isolating switch QS2.

[0093] The first isolating switch QS1 is located between the positive output interface B- and the first switch sub-circuit 010, and the two ends of the first isolating switch QS1 are connected to the positive output interface B- and the first switch sub-circuit 010 respectively.

[0094] The second isolating switch QS2 is located between the negative output interface P- and the second switch sub-circuit 020, and the two ends of the second isolating switch QS2 are respectively connected to the negative output interface P- and the second switch sub-circuit 020.

[0095] Among them, the connection point between the first voltage detection sub-circuit 030 and the main positive circuit Z1 is further away from the positive output interface B- than the first isolating switch QS1, and the connection point between the first voltage detection sub-circuit 030 and the main negative circuit Z2 is further away from the negative output interface P- than the second isolating switch QS2.

[0096] The first isolating switch QS1 and the second isolating switch QS2 can physically disconnect the switching circuit 000, ensuring the safety of the switching circuit 000 and its connected structure. The first isolating switch QS1 and the second isolating switch QS2 can be connected to facilitate synchronous control and rapid disconnection of the switching circuit 000.

[0097] In summary, because the switching circuit includes a first voltage detection sub-circuit, with one end connected to the portion of the main positive circuit located between the first switching sub-circuit and the positive output interface, and the other end connected to the portion of the main negative circuit located between the second switching sub-circuit and the negative output interface, the first voltage detection sub-circuit can detect a voltage signal when the switching circuit is closed. The detected voltage signal indicates that both the first and second switching sub-circuits are normally closed. Conversely, if the first voltage detection sub-circuit does not detect a voltage signal, it indicates that at least one of the first and second switching sub-circuits is abnormally closed. Thus, by placing the first voltage detection sub-circuit relatively close to the positive and negative output interfaces, the state of the switching circuit can be detected quickly and accurately.

[0098] When at least one of the first and second switching sub-circuits has a switching voltage detection sub-circuit, if the switching circuit is closed and the switching voltage detection sub-circuit can detect a voltage signal, the detected voltage signal indicates that the corresponding switching sub-circuit is in a closed state. Conversely, if the switching voltage detection sub-circuit does not detect a voltage signal, it indicates that the corresponding switching sub-circuit is in an abnormal closing state. Thus, the state of the corresponding switching sub-circuit can be accurately detected through the switching voltage detection sub-circuit.

[0099] That is, the switching circuit in this application can perform switching circuit state detection by at least one of the first voltage detection sub-circuit and the switching voltage detection sub-circuit, thus enriching the switching circuit state detection methods and improving the reliability of state detection.

[0100] Furthermore, using both the first voltage detection sub-circuit and the switch voltage detection sub-circuit simultaneously for switch circuit status detection not only improves the reliability of status detection but also facilitates fault diagnosis and maintenance.

[0101] Figure 5 This is a schematic diagram of an energy storage device structure provided in an embodiment of this application. Please refer to it. Figure 5 In another embodiment of this application, an energy storage device 100 is provided, including: a battery cluster 110, a battery management system 120, and a switching circuit 000 as described above.

[0102] The two ends of the battery cluster 110 are connected to the positive input interface B+ and the negative input interface P+ in the switching circuit 000, respectively.

[0103] The battery management system 120 is connected to the first switch sub-circuit 010 and the second switch sub-circuit 020 respectively.

[0104] Among them, a load, such as an inverter, can be connected between the positive output interface B- and the negative output interface P- of the switching circuit 000.

[0105] Since the energy storage device 100 in this embodiment includes the switching circuit 000 in the above embodiment, when the detection reliability of the switching circuit 000 is improved, the reliability of the energy storage device 100 using the switching circuit 000 is also improved, reducing the possibility of equipment failure due to the failure of the switching circuit 000.

[0106] In some possible implementations, the switching circuit 000 can be applied to a high-voltage box, which is applied to the energy storage device 100.

[0107] In some possible implementations, where the switching circuit 000 includes a first voltage detection sub-circuit 030, a second voltage detection sub-circuit 040, a third voltage detection sub-circuit 011, and a fourth voltage detection sub-circuit 021, at least one of the first voltage detection sub-circuit 030, the second voltage detection sub-circuit 040, the third voltage detection sub-circuit 011, and the fourth voltage detection sub-circuit 021 is integrated within the battery management system 120.

[0108] For example, please refer to Figure 6 , Figure 6 This is a schematic diagram of a battery management system structure provided in an embodiment of this application. The battery management system 120 has a first voltage detection module 121, a second voltage detection module 122, a first level detection module 123, and a second level detection module 124.

[0109] Among them, the first voltage detection module 121 can integrate the first voltage detection sub-circuit 030, the second voltage detection module 122 can integrate the second voltage detection sub-circuit 040, the first level detection module 123 can integrate the third voltage detection sub-circuit 011, and the second level detection module 124 can integrate the fourth voltage detection sub-circuit 021.

[0110] The battery management system 120 in the energy storage device 100 can rely on the existing first voltage detection module 121, second voltage detection module 122, first level detection module 123 and second level detection module 124 to perform dual detection on the switching circuit 000 without adding any physical cost.

[0111] Figure 7 This is a schematic diagram of another energy storage device structure provided in an embodiment of this application. Please refer to it. Figure 7The first voltage detection module 121 has a first high-voltage acquisition port BAT_P and a second high-voltage acquisition port BAT_N. The first high-voltage acquisition port BAT_P is connected via a main positive circuit Z1 between the acquisition harness and the first switch sub-circuit 010 and the positive input interface B+. The second high-voltage acquisition port BAT_N is connected via a main negative circuit Z2 between the acquisition harness and the second switch sub-circuit 020 and the negative input interface P+. The second voltage detection module 122 has a third high-voltage acquisition port PCS_P and a fourth high-voltage acquisition port PCS_N. The third high-voltage acquisition port PCS_P is connected via a main positive circuit Z1 between the acquisition harness and the first switch sub-circuit 010 and the positive output interface B-. The fourth high-voltage acquisition port PCS_N is connected via a main negative circuit Z2 between the acquisition harness and the second switch sub-circuit 020 and the negative output interface P-.

[0112] The first level detection module 123 has a positive feedback contact detection port P, one end of which is connected to the first power supply 012, and the other end is connected to the positive feedback contact detection port P. The second level detection module 124 has a negative feedback contact detection port N, one end of which is connected to the second power supply 022, and the other end is connected to the negative feedback contact detection port N.

[0113] by Figure 7 For example, the switching circuit 000 in this embodiment includes two detection methods, with a 24V power supply as an example.

[0114] Method 1 for detecting switch circuit 000: One end of the positive feedback contact of the main positive relay KM1 is connected to the positive feedback contact detection port P of the battery management system 120, and the other end is connected to the 24V+ of the first power supply 012. One end of the negative feedback contact of the main negative relay KM2 is connected to the negative feedback contact detection port N of the battery management system 120, and the other end is connected to the 24V+ of the second power supply 022. When the main positive relay KM1 and the main negative relay KM2 are closed, the corresponding relay feedback contacts are closed simultaneously. At this time, the positive feedback contact detection port P of the battery management system 120 collects 24V+, and can detect that the main positive relay KM1 is closed. The negative feedback contact detection port N collects 24V+, and can detect that the main negative relay KM2 is closed. When the main positive relay KM1 is open, the corresponding positive feedback contact is open. At this time, the positive feedback contact detection port P of the battery management system 120 is disconnected from 24V+, and can detect that the main positive relay KM1 is open. When the main negative relay KM2 is disconnected, the corresponding negative feedback contact is disconnected. At this time, the negative feedback contact detection port N of the battery management system 120 is disconnected from 24V+, and the disconnection of the main negative relay KM2 can be detected.

[0115] Method 2 for detecting 000 errors in switching circuits:

[0116] The first high-voltage acquisition port BAT_P is connected via the acquisition harness and the main positive circuit Z1 between the first switch sub-circuit 010 and the positive input interface B+. The second high-voltage acquisition port BAT_N is connected via the acquisition harness and the main negative circuit Z2 between the second switch sub-circuit 020 and the negative input interface P+. The first voltage signal between the positive input port and the negative input interface P+ can be acquired through the first high-voltage acquisition port BAT_P and the second high-voltage acquisition port BAT_N.

[0117] The third high-voltage acquisition port PCS_P is connected via the acquisition harness and the main positive circuit Z1 between the first switch sub-circuit 010 and the positive output interface B-. The fourth high-voltage acquisition port PCS_N is connected via the acquisition harness and the main negative circuit Z2 between the second switch sub-circuit 020 and the negative output interface P-. The second voltage signal between the positive output port and the negative output interface P- can be acquired through the third high-voltage acquisition port PCS_P and the fourth high-voltage acquisition port PCS_N. If the values ​​of the first voltage signal and the second voltage signal are close, it indicates that the main positive relay KM1 and the main negative relay KM2 are closed. If the values ​​of the first voltage signal and the second voltage signal differ significantly, it indicates that the main positive relay KM1 and the main negative relay KM2 are not fully closed.

[0118] For the main positive relay KM1 and main negative relay KM2 in the switching circuit 000 of this application embodiment, the relay state can be detected both by the relay feedback contact combined with the corresponding switching voltage detection sub-circuit 050, and by detecting the voltage signals on both sides of the relay. This provides a dual detection method for the relay state, increasing the reliability and accuracy of relay state detection. Furthermore, determining the relay state by detecting the voltage signals on both sides of the relay has the advantage of fast response speed, approximately ten times faster than the relay feedback contact detection method.

[0119] It is understood that the relays mentioned above refer to the main positive relay KM1 and the main negative relay KM2, and the feedback contacts refer to the positive feedback contact in the main positive relay KM1 and the negative feedback contact in the main negative relay KM2. The switching voltage detection sub-circuit 050 corresponding to the feedback contacts is the same as the third voltage detection sub-circuit 011 corresponding to the positive feedback contact and the fourth voltage detection sub-circuit 021 corresponding to the negative feedback contact. The detection of the voltage signals on both sides of the relays is achieved through the first voltage detection sub-circuit 030 and the second voltage detection sub-circuit 040 mentioned above.

[0120] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0121] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A switching circuit, characterized in that, include: Main positive circuit (Z1), main negative circuit (Z2), first switch sub-circuit (010), and second switch sub-circuit (020); The main positive circuit (Z1) has a positive input interface (B+) and a positive output interface (B-); the first switch sub-circuit (010) is located between the positive input interface (B+) and the positive output interface (B-), and the two ends of the first switch sub-circuit (010) are respectively connected to the positive input interface (B+) and the positive output interface (B-); The main negative circuit (Z2) has a negative input interface (P+) and a negative output interface (P-); the second switch sub-circuit (020) is located between the negative input interface (P+) and the negative output interface (P-), and the second switch sub-circuit (020) is connected to the negative input interface (P+) and the negative output interface (P-) respectively; The switching circuit further includes: a first voltage detection sub-circuit (030), and / or, at least one of the first switching sub-circuit (010) and the second switching sub-circuit (020) includes a switching voltage detection sub-circuit (050); In the case where the switching circuit includes the first voltage detection sub-circuit (030), one end of the first voltage detection sub-circuit (030) is connected to the portion of the main positive circuit (Z1) located between the first switching sub-circuit (010) and the positive output interface (B-), and the other end is connected to the portion of the main negative circuit (Z2) located between the second switching sub-circuit (020) and the negative output interface (P-).

2. The switching circuit according to claim 1, characterized in that, The switching circuit further includes: a second voltage detection sub-circuit (040); One end of the second voltage detection sub-circuit (040) is connected to the portion of the main positive circuit (Z1) located between the first switch sub-circuit (010) and the positive input interface (B+), and the other end is connected to the portion of the main negative circuit (Z2) located between the second switch sub-circuit (020) and the negative input interface (P+). Wherein, if the switching circuit includes the second voltage detection sub-circuit (040), the switching circuit includes the first voltage detection sub-circuit (030).

3. The switching circuit according to claim 2, characterized in that, The first switching sub-circuit (010) includes: a main positive relay (KM1) and a third voltage detection sub-circuit (011); The main positive relay (KM1) is located between the positive input interface (B+) and the positive output interface (B-), and the two ends of the main positive relay (KM1) are respectively connected to the positive input interface (B+) and the positive output interface (B-); The main positive relay (KM1) has a positive feedback contact, one end of the third voltage detection sub-circuit (011) is connected to the positive feedback contact, and the other end is used to connect to the power supply; the third voltage detection sub-circuit (011) is the switch voltage detection sub-circuit (050).

4. The switching circuit according to claim 3, characterized in that, The first switch sub-circuit (010) further includes: a pre-charge relay (KM0) and a pre-charge resistor (R); One end of the precharge relay (KM0) is connected to the positive input interface (B+), and the other end is connected to one end of the precharge resistor (R); the other end of the precharge resistor (R) is connected to the positive output interface (B-).

5. The switching circuit according to claim 2, characterized in that, The second switching sub-circuit (020) includes: a main negative relay (KM2) and a fourth voltage detection sub-circuit (021); The main negative relay (KM2) is located between the negative input interface (P+) and the negative output interface (P-), and the two ends of the main negative relay (KM2) are respectively connected to the negative input interface (P+) and the negative output interface (P-); The main negative relay (KM2) has a negative feedback contact. One end of the fourth voltage detection sub-circuit (021) is connected to the negative feedback contact, and the other end is used to connect to the power supply. The fourth voltage detection sub-circuit (021) is the switch voltage detection sub-circuit (050).

6. The switching circuit according to any one of claims 2 to 5, characterized in that, The switching circuit further includes a shunt (RS); the shunt (RS) is located between the second switching sub-circuit (020) and the negative input interface (P+), and the two ends of the shunt (RS) are respectively connected to the second switching sub-circuit (020) and the negative input interface (P+); The connection point between the second voltage detection sub-circuit (040) and the main negative circuit (Z2) is closer to the negative input interface (P+) than the shunt (RS).

7. The switching circuit according to claim 6, characterized in that, The switching circuit also includes: a first fuse (FU1) and a second fuse (FU2); The first fuse (FU1) is located between the positive input interface (B+) and the first switch sub-circuit (010), and the two ends of the first fuse (FU1) are respectively connected to the positive input interface (B+) and the first switch sub-circuit (010); The second fuse (FU2) is located between the shunt (RS) and the second switch sub-circuit (020), and the two ends of the second fuse (FU2) are respectively connected to the shunt (RS) and the second switch sub-circuit (020); The connection point between the second voltage detection sub-circuit (040) and the main positive circuit (Z1) is closer to the positive input interface (B+) than the first fuse (FU1).

8. The switching circuit according to any one of claims 1 to 5, 7, characterized in that, The switching circuit further includes: a first disconnect switch (QS1) and a second disconnect switch (QS2); The first disconnect switch (QS1) is located between the positive output interface (B-) and the first switch sub-circuit (010), and the two ends of the first disconnect switch (QS1) are respectively connected to the positive output interface (B-) and the first switch sub-circuit (010); The second isolating switch (QS2) is located between the negative output interface (P-) and the second switch sub-circuit (020), and the two ends of the second isolating switch (QS2) are respectively connected to the negative output interface (P-) and the second switch sub-circuit (020); The connection point between the first voltage detection sub-circuit (030) and the main positive circuit (Z1) is further away from the positive output interface (B-) relative to the first disconnecting switch (QS1), and the connection point between the first voltage detection sub-circuit (030) and the main negative circuit (Z2) is further away from the negative output interface (P-) relative to the second disconnecting switch (QS2).

9. An energy storage device, characterized in that, include: Battery cluster (110), battery management system (120), and switching circuit (000) as described in any one of claims 1 to 8; The two ends of the battery cluster (110) are respectively connected to the positive input interface (B+) and the negative input interface (P+) in the switching circuit (000); The battery management system (120) is connected to the first switch sub-circuit (010) and the second switch sub-circuit (020) respectively.

10. The energy storage device according to claim 9, characterized in that, When the switching circuit (000) includes a first voltage detection sub-circuit (030), a second voltage detection sub-circuit (040), a third voltage detection sub-circuit (011), and a fourth voltage detection sub-circuit (021), at least one of the first voltage detection sub-circuit (030), the second voltage detection sub-circuit (040), the third voltage detection sub-circuit (011), and the fourth voltage detection sub-circuit (021) is integrated into the battery management system (120).

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