Power supply control circuit, battery pack, control panel, management system and electric equipment

Abstract

The utility model discloses a power supply control circuit, a battery pack, a control panel, a management system and electric equipment in the field of circuit control. According to the power supply control circuit, the switch control module and the gating switch module are arranged, the power supply of the relay can be switched between the first power supply and the second power supply in the relay conduction process, even if one power supply breaks down, the power supply can be switched to the other power supply to supply power, and in the power supply switching process, the power supply can be switched to the first power supply. The relay can still keep a stable working state without being affected, and safety redundant measures are added for a circuit controlled by the relay. Meanwhile, the voltage of the first power supply is larger than that of the second power supply, the switch control module can control the gating switch module, when the relay is started, power is supplied by the first power supply with the large voltage, and after the relay enters the stable working state, power is supplied by the second power supply. When the relay works stably, the relay is powered by a power supply with low voltage, and the energy consumption of a driving coil of the relay is lower.

Description

Technical Field

[0001] The present disclosure relates to the field of circuit control technology, and in particular, to a power control circuit, a battery pack, a control board, a management system and an electric device. Background Art

[0002] As a common electrical device, relays are widely used in production, life and various equipment. During the use of relays, only by maintaining uninterrupted power supply can the relay maintain a working state that can be activated at any time. If the power supply of the relay fails and the relay cannot be powered, the working state of the relay will be interrupted and cannot maintain a stable working state. Utility Model Content

[0003] The purpose of the present disclosure is to provide a power control circuit, a battery pack, a control board, a management system and an electric device.

[0004] In order to achieve the above object, the present disclosure provides a relay power supply control circuit, including: a gate switch module and a switch control module;

[0005] The input end of the selection switch is used to be electrically connected to both the first power supply and the second power supply, the output end of the selection switch module is used to be connected to the relay, and the voltage of the first power supply is greater than that of the second power supply;

[0006] The output end of the switch control module is electrically connected to the control end of the gate switch module, and the switch control module is used to control the gate switch module to switch the power supply of the relay between the first power supply and the second power supply during the conduction process of the relay.

[0007] Optionally, the input end of the switch control module is used to be electrically connected to the input end of the relay, and the switch control module is used to switch the first power supply to power the relay after the second power supply is turned on to power the relay and when the input voltage of the relay is less than a preset voltage.

[0008] Optionally, the input end of the switch control module is used to be electrically connected to the input end of the relay, and the switch control module is used to switch the second power supply to power the relay when the input voltage of the relay is less than the preset voltage, after turning on the first power supply to power the relay, and when the input voltage of the relay is greater than or equal to the preset voltage.

[0009] Optionally, the relay power supply control circuit further includes a delay signal circuit, the input end of the delay signal circuit is connected to the first power supply, and the output end of the delay signal circuit is connected to the input end of the switch control module;

[0010] The delay signal circuit is used to output a trigger signal after the first power supply supplies power to the relay for a preset period of time, and the switch control module is used to control the selection switch module to turn on the second power supply to power the relay in response to the trigger signal.

[0011] Optionally, the switch control module includes a voltage comparison subcircuit and a switch control subcircuit, the input end of the voltage comparison subcircuit is used to connect to the output end of the second power supply, the output end of the voltage comparison subcircuit is connected to the input end of the switch control subcircuit, and the output end of the switch control subcircuit is electrically connected to the control end of the selection switch module.

[0012] Optionally, the gate switch module includes a switch tube and a diode;

[0013] The first end of the switch tube is electrically connected to the first power supply, and the control end of the switch tube is electrically connected to the output end of the switch control module;

[0014] The output end of the second power supply is connected to the anode of the diode;

[0015] The second end of the switch tube and the cathode of the diode are connected to the relay in common line.

[0016] Optionally, a step-down circuit is included, and an input end of the step-down circuit is electrically connected to an output end of the first power supply as the second power supply.

[0017] Optionally, the delay signal circuit includes a first resistive device, a first capacitive device and a second resistive device, the first resistive device, the first capacitive device and the second resistive device are connected in series in sequence, one end of the first resistive device is connected to the first power supply, and one end of the second resistive device is connected to the switch control module.

[0018] Optionally, the switch tube is a metal-oxide semiconductor field effect transistor.

[0019] The present disclosure also provides a battery control board, comprising the above-mentioned relay power supply control circuit.

[0020] The present disclosure also provides a battery management system, comprising the above-mentioned relay power control circuit or battery control board.

[0021] The present disclosure also provides a battery pack, comprising the above-mentioned relay power control circuit, battery control board or battery management system.

[0022] The present disclosure also provides an electric device, including a relay and the above-mentioned relay power control circuit, a battery control board, a battery management system or a battery pack.

[0023] The relay power supply control circuit in the present disclosure is provided with a switch control module and a gate switch module, so that during the relay conduction process, the power supply of the relay can be switched between the first power supply and the second power supply, even if one of the power supplies fails, it can be switched to the other power supply for power supply, and during the power supply switching process, the relay can still maintain a stable working state, and will not affect the relay, thereby adding a safety redundancy measure to the circuit controlled by the relay. At the same time, the voltage of the first power supply is greater than the voltage of the second power supply, and the switch control module can control the gate switch module, and when the relay is started, it is powered by the first power supply with a larger voltage, and after the relay enters a stable working state, it is powered by the second power supply. On the one hand, the larger current at startup is not provided by the second power supply with a lower voltage, so as to avoid the impact of the larger current on the power supply with a lower voltage, and reduce the risk of circuit failure. On the other hand, when the relay is working stably, it is powered by a power supply with a smaller voltage, and the energy consumption of the driving coil of the relay is also smaller.

[0024] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following detailed description, but do not constitute a limitation of the present disclosure.

[0026] Figure 1 A schematic diagram of a relay power supply control circuit provided by an exemplary embodiment of the present disclosure.

[0027] Figure 2 A schematic diagram of another relay power control circuit provided by an exemplary embodiment of the present disclosure.

[0028] Figure 3 A schematic diagram of another relay power control circuit provided by an exemplary embodiment of the present disclosure.

[0029] Figure 4 A schematic diagram of another relay power control circuit provided by an exemplary embodiment of the present disclosure.

[0030] Figure 5 A schematic diagram of another relay power control circuit provided by an exemplary embodiment of the present disclosure.

[0031] Figure 6 A circuit diagram of a relay power supply control circuit provided by an exemplary embodiment of the present disclosure.

[0032] Description of reference numerals:

[0033] 101 - selection public module, 102 - switch control module, 10 - first power supply, 20 - second power supply, 30 - relay, 103 - delay signal circuit, 121 - voltage comparison sub-circuit, 122 - switch control sub-circuit. DETAILED DESCRIPTION

[0034] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0035] Figure 1 Schematic diagram of a relay power supply control circuit provided by an exemplary embodiment of the present disclosure. Figure 1 As shown, the relay power supply control circuit provided by the embodiment of the present disclosure includes: a gate switch module 101 and a switch control module 102 .

[0036] In detail, the input end of the selection switch module 101 is electrically connected to both the first power supply 10 and the second power supply 20 , the output end of the selection switch module 101 is used to connect to the relay 30 , and the voltage of the first power supply 10 is greater than that of the second power supply 20 .

[0037] The output end of the switch control module 102 is electrically connected to the control end of the gate switch module 101. The switch control module 102 is used to control the gate switch module 101 to selectively turn on the first power supply 10 to supply power to the relay 30 or turn on the second power supply 20 to supply power to the relay 30 during the conduction process of the relay 30. The switch control module 102 can control the gate switch module 101 to switch the power supply of the relay 30 between the first power supply 10 and the second power supply 20.

[0038] The first power supply 10 and the second power supply 20 can be DC power supplies, and the first power supply 10 and the second power supply 20 can output electrical energy after receiving a voltage output instruction. During the normal operation of the relay 30, the first power supply 10 and the second power supply 20 are both in a normal power supply state, and when the gate switch module 101 conducts the circuit between a power supply and the relay 30, a power supply can supply power to the relay 30.

[0039] The first power supply 10 and the second power supply 20 can be connected to the driving coil of the relay 30 through the gate switch module 101. The gate switch module 101 can turn on the first power supply 10 to power the relay 30, or can turn on the second power supply 20 to power the relay 30. The output voltage of the first power supply 10 is set to a voltage that can meet the large current required when the relay 30 is started, and the output voltage of the second power supply 20 is set to a voltage that can meet the voltage when the relay 30 is working stably. The switch control module 102 controls the gate switch module 101 so that only one power supply supplies power to the relay 30 at the same time. The switch control module 102 can control the gate switch module 101 to switch the power supply of the relay 30 when the relay 30 is in a stable working state, so that the relay 30 is powered by different power supplies without stopping working.

[0040] The relay 30 can be powered by the first power supply 10 when it is started. After the relay 30 is started, the selection switch module 101 can selectively turn on the second power supply 20 under the control of the switch control module 102 to power the relay 30. Since the output voltage of the first power supply 10 is greater than the output voltage of the second power supply 20, the relay 30 is powered by the second power supply 20 with a smaller voltage when it is in a stable working state, so that the relay 30 can be reliably maintained in a stable working state and the energy consumption of the driving coil can be reduced. When the relay 30 is started, the larger current provided by the first power supply 10 will not flow through the second power supply 20, which can avoid the impact of the larger current on the second power supply 20 and reduce the risk of circuit failure.

[0041] In this way, the relay power supply control circuit in the present disclosure is provided with a switch control module 102 and a gate switch module 101, so that during the conduction process of the relay 30, the power supply of the relay 30 can be switched between the first power supply 10 and the second power supply 20, even if one of the power supplies fails, it can be switched to the other power supply for power supply, and during the power supply switching process, the relay 30 can still maintain a stable working state, and will not affect the relay 30, and a safety redundancy measure is added to the circuit controlled by the relay 30. At the same time, the voltage of the first power supply 10 is greater than the voltage of the second power supply 20, and the switch control module 102 can control the gate switch module 101, and when the relay 30 is started, it is powered by the first power supply 10 with a larger voltage, and after the relay 30 enters a stable working state, it is powered by the second power supply 20. On the one hand, the second power supply 20 with a lower voltage does not provide a larger current at startup, so as to avoid the impact of a larger current on the power supply with a lower voltage, and reduce the risk of circuit failure. On the other hand, when the relay 30 is working stably, it is powered by a power supply with a lower voltage, and the energy consumption of the driving coil of the relay 30 is also smaller.

[0042] Figure 2Schematic diagram of another relay power supply control circuit provided by an exemplary embodiment of the present disclosure. Figure 2 As shown, in a possible implementation, the input end of the switch control module 102 is used to be electrically connected to the input end of the relay 30, and the switch control module 102 is used to turn on the first power supply 10 to power the relay 30 after turning on the second power supply 20 to power the relay 30, when the input voltage of the relay 30 is less than a preset voltage, thereby switching the power supply of the relay 30 to the first power supply 10.

[0043] When the relay 30 is in a stable working state, if the second power supply 20 fails, or some components in the circuit fail, causing the output voltage of the second power supply 20 to be lower than the voltage required for the normal operation of the relay 30, the switch control module 102 can switch the power supply of the relay 30 to the first power supply 10, and the first power supply 10 provides the electric energy required for the stable operation of the relay 30, ensuring that the relay 30 can continue to maintain the working state, and the relay 30 will not fail to work normally due to the reduction of the output voltage of the second power supply 20. The size of the preset voltage can be determined according to the minimum voltage when the relay 30 is working stably, and the embodiment of the present disclosure does not limit the size of the preset voltage.

[0044] It can be understood that the input end of the switch control module 102 is used to be electrically connected to the input end of the relay 30. When the switch control module 102 controls the gate switch module 101 to supply power to the relay 30 with the second power supply 20, the input voltage of the relay 30 can be regarded as the voltage of the power input end of the relay 30 itself, or as the output voltage of the second power supply 20. That is, the situation where the input voltage of the relay 30 is less than the preset voltage can include two situations. One is that the output voltage of the second power supply 20 has a deviation, so that the input voltage of the relay 30 is less than the preset voltage. The other is that the output voltage of the second power supply 20 is normal, but due to a fault in the gate switch module 101, the electric energy output by the second power supply 20 cannot be supplied to the relay 30 through the gate switch module 101, and the input voltage of the relay 30 is less than the preset voltage.

[0045] In either case, when the second power supply 20 supplies power to the relay 30, once the input voltage of the relay 30 is lower than the preset voltage, the switch control module 102 can control the gate switch module 101 to turn on the first power supply 10, and the power supply of the relay 30 is switched to the first power supply 10. Thus, the stable working state of the relay 30 is ensured not to be interrupted, and the relay 30 can work stably and uninterruptedly.

[0046] When the output voltage of the second power supply 20 returns to normal, or the fault in the selection switch module 102 is eliminated, so that the input voltage of the relay 30 is greater than or equal to the preset voltage, the switch control module 102 can control the selection switch module 101 to turn on the second power supply 20 again, and the second power supply 20 will supply power to the relay 30 again, so that the stable working state of the relay 30 will not be interrupted, and the relay 30 will re-enter the working state with lower energy consumption.

[0047] In this way, when the relay 30 is started and works stably, the switch control module 102 switches the power supply of the relay 30 from the second power supply 20 to the first power supply 10 when the input voltage of the relay 30 is less than the preset voltage, so as to ensure that the working state of the relay 30 is not interrupted and the circuit maintained by the relay 30 can operate normally. After the input voltage of the relay 30 is restored, the switch control module 102 can control the selection switch module 101 to switch the power supply of the relay 30 back to the second power supply 20, so that the relay 30 is powered by a power supply with a lower voltage, and the relay 30 re-enters a working state with lower power consumption.

[0048] Figure 3 A schematic diagram of another relay power supply control circuit provided by an exemplary embodiment of the present disclosure is shown as follows: Figure 3 As shown, in a possible implementation, the relay power supply control circuit may further include a delay signal circuit 103 , the input end of the delay signal circuit 103 is connected to the first power supply 10 , and the output end of the delay signal circuit 103 is connected to the input end of the switch control module 102 .

[0049] The delay signal circuit 103 is used to output a trigger signal after the first power supply 10 supplies power to the relay 30 for a preset period of time. The switch control module 102 is used to control the selection switch module 101 to turn on the second power supply 20 to supply power to the relay 30 in response to the trigger signal.

[0050] When the entire circuit is powered on and the relay 30 starts to start, the switch control module 102 can control the selection switch module 101 to select the first power supply 10 to supply power to the relay 30. By setting the delay signal circuit 103, after the relay 30 starts, the delay signal circuit 103 can output a trigger signal, so that the selection switch module 101 switches the power supply of the relay 30 to the second power supply 20 after receiving the trigger signal. The preset time length from the first power supply 10 to the output of the trigger signal of the delay signal circuit 103 to the start of supplying power to the relay 30 can be determined according to the actual situation. It is necessary to ensure that the relay 30 has been started and reliably closed within the preset time length. After the relay 30 starts normally, the power supply of the relay 30 can be switched to the second power supply 20 with a smaller voltage, thereby entering a stable working state with lower power consumption.

[0051] Figure 4 Schematic diagram of another relay power supply control circuit provided by an exemplary embodiment of the present disclosure. Figure 4 As shown, the switch control module 102 includes a voltage comparison subcircuit 121 and a switch control subcircuit 122. The input end of the voltage comparison subcircuit 121 is used to connect to the output end of the second power supply 20, the output end of the voltage comparison subcircuit 121 is connected to the input end of the switch control subcircuit 122, and the output end of the switch control subcircuit 122 is electrically connected to the control end of the selection switch module 101.

[0052] When the relay 30 is in a stable working state, it can be powered by the second power supply 20. The voltage comparison subcircuit 121 can compare the output voltage of the second power supply 20 with the preset voltage. As mentioned above, when the output voltage of the second power supply 20 is less than the preset voltage, it indicates that the second power supply 20 may have a fault. The voltage comparison subcircuit 121 can output a comparison result signal. The switch control subcircuit 122 can control the gate switch module 101 to switch the power supply of the relay 30 from the second power supply 20 to the first power supply 10 according to the signal, so that the power supply of the relay 30 will not be interrupted. The voltage comparison subcircuit 121 can also output a comparison result signal when the output voltage of the second power supply 20 is restored to be greater than or equal to the preset voltage. The switch control subcircuit 122 controls the gate switch module 101 to switch the power supply of the relay 30 from the first power supply 10 back to the second power supply 20 according to the signal, so that the working state of the relay 30 is not interrupted and the relay 30 re-enters the working state with lower power consumption.

[0053] Figure 5 Schematic diagram of another relay power supply control circuit provided by an exemplary embodiment of the present disclosure. Figure 5 As shown, the gate switch module 101 may include a switch tube Q1 and a diode D1.

[0054] The first end of the switch tube Q1 is electrically connected to the first power supply 10, and the control end of the switch tube Q1 is electrically connected to the output end of the switch control module 102. The output end of the second power supply 20 is connected to the anode of the diode D1. The second end of the switch tube Q1 and the cathode of the diode D1 are used to be connected to the relay 30 after being collinear.

[0055] The switch tube Q1 can be a metal-oxide semiconductor field effect transistor MOSFET. The embodiment of the present disclosure does not limit the specific form of the switch tube. The switch tube Q1 can be turned on or off under the control of the switch control module 102. Since the output voltage of the second power supply 20 is output to the relay 30 after passing through the diode D1, and the output voltage of the first power supply 10 is greater than the output voltage of the second power supply 20, the switch tube Q1 and the cathode of the diode D1 are in the same line. When the switch control module 102 controls the switch tube Q1 to be turned on, the first power supply 10 can supply power to the relay 30. At this time, the diode D1 is reverse biased and not turned on, so that the second power supply 20 cannot output electric energy to the relay 30. The power supply of the relay 30 is completely provided by the first power supply 10, and the relay 30 can be started under the power supply of the first power supply 10 that provides a higher voltage. The selection switch module 101 is provided with a diode D1. When the first power supply 10 and the second power supply 20 are provided in parallel, the selection switch module 101 can not only reverse bias and block the current, but also can be turned on again when the switch tube Q1 is turned off and the first power supply 10 no longer supplies power to the relay 30, so that the second power supply 20 supplies power to the relay 30, thereby realizing the switching of the power supply of the relay 30 between the first power supply 10 and the second power supply 20.

[0056] Figure 6 FIG. 1 is a circuit diagram of another relay power supply control circuit provided by an exemplary embodiment of the present disclosure. Figure 6 As shown, the switch control subcircuit 122 may include a plurality of switch tubes, the power supply of the voltage comparison subcircuit 121 may be provided by the first power supply 10, and the comparison result signal of the voltage comparison subcircuit 121 may be output to the switch tube Q4 in the switch control subcircuit 122. When the second power supply 20 supplies power to the relay 30, if the voltage comparison subcircuit 121 outputs the comparison result signal to the switch tube Q4 after the output voltage of the second power supply 20 is less than the preset voltage, the switch tube Q4 is turned off, and then the switch tubes Q3, Q2, and Q5 are turned on, and then the switch tube Q1 in the gate switch module 101 is controlled to be turned on, and the first power supply 10 can supply power to the relay 30. Thus, when the relay 30 is turned on, the power supply is switched from the second power supply 20 to the first power supply 10. Since the switching process of the power supply is related to the switching time of each switch tube, in order to ensure that the working state of the relay 30 will not be interrupted, the models of each switch tube and the relay can be selected according to actual needs so that the working state of the relay 30 will not be interrupted.

[0057] After the power supply of the relay 30 is switched from the second power supply 20 to the first power supply 10, if the voltage comparison sub-circuit 121 obtains that the output voltage of the second power supply 20 is greater than or equal to the preset voltage, that is, the output voltage of the second power supply 20 returns to normal, the comparison result signal is output to the switch tube Q4, the switch tube Q4 is turned on, and then the switch tubes Q3, Q2, and Q5 are turned off, and then the switch tube Q1 in the control selection switch module 101 is controlled to be turned off, and the power supply of the first power supply 10 is cut off. The second power supply 20 can supply power to the relay 30 through the diode D1, so that the working state of the relay 30 is not interrupted, and the relay 30 enters a stable working state with low power consumption and powered by the second power supply 20 with a smaller voltage.

[0058] Understandably, Figure 6 The circuit shown is only one of the implementations of the present disclosure and does not represent a limitation on the circuit implementation. The parameters and connection methods of the switch tubes, comparators and other components in the switch control subcircuit 122 and the voltage comparison subcircuit 121 can be determined according to actual needs.

[0059] For example Figure 5 and Figure 6 As shown, in a possible implementation, the relay power control circuit may further include a step-down circuit (not shown in the figure), which may be used as the second power supply 20. The input end of the step-down circuit (i.e., the second power supply 20) is electrically connected to the output end of the first power supply 10. The step-down circuit may reduce the voltage of the first power supply 10 before outputting it. For example, in actual use, according to the voltage requirement for stable operation of the relay 30, the step-down circuit may reduce the voltage of the first power supply 10 to 6V before outputting it.

[0060] For example Figure 6 As shown, in a possible implementation, the delay signal circuit 103 may include a first resistive device R1, a first capacitive device C1, and a second resistive device R2. The first resistive device R1, the first capacitive device C1, and the second resistive device R2 are connected in series in sequence. One end of the first resistive device R1 is connected to the first power supply 10, and one end of the second resistive device R2 is connected to the switch control module 102.

[0061] By selecting the resistance or capacitance of the first resistive device R1, the first capacitive device C1 and the second resistive device R2, the time point at which the delay signal circuit 103 outputs the trigger signal can be changed. The embodiment of the disclosure does not limit the specific parameters of the first resistive device R1, the first capacitive device C1 and the second resistive device R2.

[0062] The present disclosure also provides a battery control board, including the above-mentioned relay power control circuit. The battery control board can control the relay in the battery through the relay power control circuit. The structure of the relay control circuit is recorded in the above-mentioned embodiment and will not be repeated here.

[0063] The present disclosure also provides a battery management system, including the above-mentioned relay power control circuit or battery control board. The battery management system can control the relay in the battery pack or the relay connected to the battery pack through the relay control circuit. The structure of the relay control circuit is recorded in the above-mentioned embodiment and will not be repeated here.

[0064] The present disclosure also provides a battery pack, including the above-mentioned relay power control circuit, battery control board or battery management system. The relay power control circuit in the battery pack can realize the control of the relay in the battery pack or the relay connected to the battery pack. The structure of the relay control circuit is recorded in the above-mentioned embodiment and will not be repeated here.

[0065] The embodiment of the present disclosure also provides an electric device, including a relay and the above-mentioned relay power control circuit, a battery control board, a battery management system or a battery pack. The relay can control the on and off of certain circuits on the electric device. In possible implementations, the electric device can be a vehicle, an aircraft, a ship, an energy storage cabinet, an air conditioner and other equipment. For example, the relay power control circuit can control the on and off of the vehicle's starting power supply. The relay power control circuit provided by the embodiment of the present disclosure is used to control the relay on the vehicle. The switch control module can receive a control signal from the electronic control unit on the vehicle, control the relay to start, and after the relay starts, switch the power supply of the relay from the first power supply to the second power supply. And when the relay is in a stable working state, the power supply of the relay can be switched to the first power supply again to ensure that the working state of the relay is not interrupted, so that the vehicle circuit controlled by the relay will not be interrupted, thereby improving the safety of the vehicle circuit.

[0066] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0067] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0068] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A relay power supply control circuit, characterized in that: include: A gate switch module and a switch control module; The input end of the gating switch module is used to be electrically connected to both the first power supply and the second power supply, the output end of the gating switch module is used to be connected to the relay, and the voltage of the first power supply is greater than that of the second power supply; The output end of the switch control module is electrically connected to the control end of the selection switch module, and the switch control module is used to control the selection switch module to switch the power supply of the relay between the first power supply and the second power supply during the conduction of the relay.

2. The relay power supply control circuit according to claim 1, characterized in that: The input end of the switch control module is used to be electrically connected to the input end of the relay. The switch control module is used to switch the first power supply to power the relay after the second power supply is turned on to power the relay and when the input voltage of the relay is less than a preset voltage.

3. The relay power supply control circuit according to claim 2, characterized in that: The input end of the switch control module is used to be electrically connected to the input end of the relay. The switch control module is used to switch the second power supply to power the relay when the input voltage of the relay is less than the preset voltage, after the first power supply is turned on to power the relay, and when the input voltage of the relay is greater than or equal to the preset voltage.

4. The relay power supply control circuit according to claim 1, characterized in that: The relay power supply control circuit further comprises a time delay signal circuit, the input end of the time delay signal circuit is connected to the first power supply, and the output end of the time delay signal circuit is connected to the input end of the switch control module; The delay signal circuit is used to output a trigger signal after the first power supply supplies power to the relay for a preset period of time, and the switch control module is used to control the selection switch module to turn on the second power supply to power the relay in response to the trigger signal.

5. The relay power supply control circuit according to any one of claims 1 to 4, characterized in that: The switch control module includes a voltage comparison subcircuit and a switch control subcircuit, wherein the input end of the voltage comparison subcircuit is used to be connected to the output end of the second power supply, the output end of the voltage comparison subcircuit is connected to the input end of the switch control subcircuit, and the output end of the switch control subcircuit is electrically connected to the control end of the selection switch module.

6. The relay power supply control circuit according to any one of claims 1 to 4, characterized in that: The gate switch module includes a switch tube and a diode; The first end of the switch tube is electrically connected to the first power supply, and the control end of the switch tube is electrically connected to the output end of the switch control module; The output end of the second power supply is connected to the anode of the diode; The second end of the switch tube and the cathode of the diode are connected to the relay in common line.

7. The relay power supply control circuit according to any one of claims 1 to 4, characterized in that: The relay power supply control circuit includes a step-down circuit, and an input end of the step-down circuit is electrically connected to an output end of the first power supply as the second power supply.

8. The relay power supply control circuit according to claim 4, characterized in that: The delay signal circuit includes a first resistive device, a first capacitive device and a second resistive device, wherein the first resistive device, the first capacitive device and the second resistive device are connected in series in sequence, one end of the first resistive device is connected to the first power supply, and one end of the second resistive device is connected to the switch control module.

9. The relay power supply control circuit according to claim 6, characterized in that: The switch tube is a metal-oxide semiconductor field effect transistor.

10. A battery control board, characterized in that: A relay power supply control circuit comprising any one of claims 1 to 9.

11. A battery management system, characterized in that: It comprises the relay power supply control circuit according to any one of claims 1 to 9 or the battery control board according to claim 10.

12. A battery pack, characterized in that: It comprises the relay power supply control circuit according to any one of claims 1 to 9, the battery control board according to claim 10 or the battery management system according to claim 11.

13. An electric device, characterized in that: It comprises a relay and a relay power supply control circuit as described in any one of claims 1 to 9, a battery control board as described in claim 10, a battery management system as described in claim 11 or a battery pack as described in claim 12.

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