Power battery, and control system and control method therefor

Abstract

SOLUTION: A control system 100 applied to a power battery includes a switch circuit, a sampling circuit, and a control circuit. The control circuit determines a state of the power battery according to the temperature of the switch circuit and the current of a battery pack, and controls so as to perform a corresponding operation according to the state of the power battery.EFFECT: The control system can protect an internal device of the power battery by performing better monitoring and processing of the power battery.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application filed with the China Patent Office on June 30, 2023 and bearing application number 202321712941.9, priority to a Chinese patent application filed with the China Patent Office on June 30, 2023 and bearing application number 202310802676.1, and priority to an international patent application filed with the World Intellectual Property Organization on June 12, 2024 and bearing PCT international application number PCT / CN2024 / 098786, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of battery technology, and in particular to a power battery and its control system and method. [Background technology]

[0003] Power batteries are widely used in many fields, such as electric vehicles, etc. If a power battery experiences a fault, such as an overload or a short circuit, it poses a significant safety hazard.

[0004] In the related art, the effect of monitoring the state of the power battery is poor, and it is difficult to timely detect and respond to the state of the power battery, which makes the power battery unsafe. Summary of the Invention [Means for solving the problem]

[0005] According to a first aspect, an embodiment of the present application provides a control system applicable to a power battery, the power battery including a battery pack and a bus, the control system including a switch circuit connected between the battery pack and the bus and configured to acquire and output a temperature of the switch circuit, a sampling circuit connected between the switch circuit and the bus and configured to sample a current of the battery pack, and a control circuit connected to the switch circuit and the sampling circuit and configured to determine a state of the power battery based on the temperature of the switch circuit and the current of the battery pack, and to control to perform a corresponding operation based on the state of the power battery.

[0006] According to a second aspect, an embodiment of the present invention provides a power battery including a battery pack, a bus, and the control system according to the first aspect connected between the battery pack and the bus.

[0007] According to a third aspect, an embodiment of the present application provides a control method for a power battery, the power battery including a battery pack, a bus, and the control system described in the first aspect connected between the battery pack and the bus, the control method including the control circuit acquiring a temperature of the switch circuit and a current of the battery pack sampled by the sampling circuit, the control circuit determining a state of the power battery based on the temperature of the switch circuit and the current of the battery pack, and controlling the control circuit to perform a corresponding operation based on the state of the power battery. [Brief description of the drawings]

[0008] [Figure 1] 1 is a structural schematic diagram of a power battery control system according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a structural schematic diagram of another power battery control system according to an embodiment of the present invention. [Diagram 3] 1 is a structural schematic diagram of a relay circuit according to an embodiment of the present invention; [Figure 4]FIG. 2 is a structural schematic diagram of another power battery control system according to an embodiment of the present invention. [Diagram 5] 2 is a structural schematic diagram of a fuse circuit according to an embodiment of the present invention; [Figure 6] FIG. 2 is a structural schematic diagram of a sampling circuit according to an embodiment of the present invention. [Figure 7] FIG. 2 is a structural schematic diagram of a power battery according to an embodiment of the present invention. [Figure 8] 2 is a flowchart of a power battery control method according to an embodiment of the present invention. [Figure 9] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 10] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 11] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 12] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 13] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 14] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 15] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 16] 4 is a flowchart of another power battery control method according to an embodiment of the present disclosure. [Figure 17] FIG. 2 is a structural schematic diagram of a control circuit according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] It should be noted that the terms "first," "second," and the like in the present specification, claims, and drawings are intended to distinguish between similar objects without necessarily being used to describe a particular order or priority. It should be understood that the data so used may be interchanged where appropriate such that the embodiments of the present invention described herein may be practiced in an order other than that shown or described herein. Also, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion, e.g., a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units expressly recited, but may include other steps or units that are not expressly recited or that are inherent to the process, method, product, or apparatus.

[0010] In the related art, the effect of monitoring the state of the power battery is poor, and it is difficult to timely detect and respond to the state of the power battery, which makes the power battery unsafe. For example, the effect of monitoring the overload of the power battery is poor, and it is difficult to timely detect and respond to the overload situation of the power battery, which makes the power battery unsafe. For example, when a short circuit occurs in a power battery, passive short circuit protection is usually performed only by blowing a fuse. The short circuit current in the circuit is small, and the fuse cannot be blown quickly, so that the conductor in the circuit receives a current that exceeds the current carrying capacity, which may cause danger to the power battery, and therefore the sensitivity to short circuit protection is low.

[0011] The present application provides a control system applicable to a power battery, the power battery including a battery pack and a bus, the control system including: a switch circuit connected between the battery pack and the bus and configured to acquire and output a temperature of the switch circuit; a sampling circuit connected between the switch circuit and the bus and configured to sample a current of the battery pack; and a control circuit connected to the switch circuit and the sampling circuit and configured to determine a state of the power battery based on the temperature of the switch circuit and the current of the battery pack, and to control to perform a corresponding operation based on the state of the power battery.

[0012] In some embodiments, the states of the power battery include a short circuit state, an overload state, and a normal operating state, and the operation corresponding to the short circuit state is to control the switch circuit to disconnect, and the operation corresponding to the overload state is to control and adjust the operating parameters of the power battery to bring the power battery into the normal operating state.

[0013] In some embodiments, the switch circuit includes a relay and a fuse, the relay is connected between the battery pack and the bus, and the fuse is connected between the battery pack and the bus, the temperature of the switch circuit includes a first temperature of the relay and / or a second temperature of the fuse, and the control circuit determines a current state of the power battery based on the first temperature of the relay and / or the second temperature of the fuse and the current of the battery pack.

[0014] In some embodiments, in response to the battery pack current exceeding a preset current threshold and the first temperature of the relay exceeding a first preset threshold within a first preset time and / or the second temperature of the fuse exceeding a second preset threshold within a second preset time, the control circuit determines that the current condition of the power battery is an overload condition.

[0015] In some embodiments, in response to the battery pack current being less than the first preset current threshold and greater than the second preset current threshold, and the first temperature of the relay being greater than the first preset temperature threshold and / or the second temperature of the fuse being greater than the second preset temperature threshold, the control circuit determines that the current condition of the power battery is a short-circuit condition, and the first preset current threshold is greater than the second preset current threshold.

[0016] In some embodiments, in response to the current of the battery pack being less than a first preset current threshold and greater than a second preset current threshold, and the temperature rise rate of the first temperature of the relay within the first preset time being greater than the first temperature rise rate threshold and / or the temperature rise rate of the second temperature of the fuse within the second preset time being greater than the second temperature rise rate threshold, the control circuit determines that the current state of the power battery is a short-circuit state, and the first preset current threshold is greater than the second preset current threshold.

[0017] In some embodiments, the sampling circuit samples a first current of the battery pack, and the control circuit determines that a current state of the power battery is an overload state based on the temperature of the switch circuit and the first current of the battery pack, and controls and adjusts operating parameters of the power battery to bring the power battery into a normal operating state, and within a third preset time after the control circuit controls and adjusts the operating parameters of the power battery, the sampling circuit samples a second current of the battery pack, and the control circuit further obtains the second current, and determines that a current state of the power battery changes to a short-circuit state in response to the second current being greater than or equal to the first current.

[0018] In some embodiments, adjusting the operating parameters of the power battery includes reducing the output of the power battery.

[0019] In some embodiments, the switch circuit includes a relay, a first temperature sensor, and a relay control subcircuit, the relay connected between the battery pack and the bus, the first temperature sensor connected to the relay and configured to obtain a first temperature of the relay, the relay control subcircuit connected to the first temperature sensor, and the control circuit includes a battery management circuit connected to the relay control subcircuit and configured to send a first control command in response to the first temperature and a current of the battery pack, thereby controlling the relay control subcircuit to disconnect the relay in response to the first control command, thereby disconnecting the switch circuit, and an overall vehicle controller connected to the relay control subcircuit and configured to send a second control command when the first control command has not been sent or the relay control subcircuit has not responded to the first control command, thereby controlling the relay control subcircuit to disconnect the relay in response to the second control command, thereby disconnecting the switch circuit.

[0020] In some embodiments, the battery management circuit is connected to the relay control subcircuit via a power line to transmit the first control command, the whole-vehicle controller is connected to the relay control subcircuit via a communication line to transmit the second control command, and / or the first temperature sensor is integrated within the relay control subcircuit.

[0021] In some embodiments, the sampling circuit includes a conductor portion connected between the switch circuit and the bus and configured to conduct a current, a third temperature sensor provided on a surface of the conductor portion and configured to obtain a temperature of the conductor portion as a third temperature of the sampling circuit, and a processor connected to the third temperature sensor and the control circuit, provided on the surface of the conductor portion, and configured to obtain the third temperature and a current of the battery pack, and to modify the current of the battery pack based on the third temperature.

[0022] In some embodiments, the surface of the conductor portion includes a first surface and a second surface, the third temperature sensor is provided on the first surface of the conductor portion, the processor is provided on the second surface of the conductor portion, and the first surface is adjacent to the second surface.

[0023] In some embodiments, the switch circuit includes a fuse connected between the battery pack and the bus and configured to blow when a current in the battery pack is greater than a first preset current threshold, and a second temperature sensor connected to the fuse and the control circuit and disposed in a casing of the fuse and configured to obtain a second temperature of the fuse.

[0024] The present application provides a power battery including a battery pack, a bus, and the above control system connected between the battery pack and the bus.

[0025] The present application provides a control method for a power battery, the power battery including a battery pack, a bus, and a control system connected between the battery pack and the bus, the control method including: a control circuit acquiring a temperature of a switch circuit and a current of the battery pack sampled by a sampling circuit; the control circuit determining a state of the power battery based on the temperature of the switch circuit and the current of the battery pack, and controlling the control circuit to perform a corresponding operation based on the state of the power battery.

[0026] FIG. 1 is a structural schematic diagram of a power battery control system according to an embodiment of the present application. Referring to FIG. 1, the power battery control system 100 according to the embodiment of the present application includes a switch circuit 10, a sampling circuit 20, and a control circuit 30. The switch circuit 10 is connected between a battery pack 40 and a bus L1. The switch circuit 10 is configured to obtain and output its own temperature. The sampling circuit 20 is connected between the switch circuit 10 and the bus L1. The sampling circuit 20 is configured to sample the current of the power battery. The control circuit 30 is connected to the switch circuit 10 and the sampling circuit 20. The control circuit 30 is configured to judge whether the power battery is short-circuited or overloaded according to the temperature and current, and send a control command to the switch circuit 10 according to the judgment result, and the switch circuit 10 is configured to cut off in response to the control command when the power battery is short-circuited.

[0027] Specifically, the battery pack 40 of the power battery is connected to the bus L1 through the switch circuit 10 and the sampling circuit 20. During the operation of the battery pack 40, the current flowing through the bus L1 will generate heat in the switch circuit 10, and the switch circuit 10 can obtain the temperature generated when the current flows through itself. The sampling circuit 20 can sample the current flowing through the bus L1 by the battery pack 40. The current of the battery pack 40 can represent the current of the power battery. The control circuit 30 can obtain the temperature of the switch circuit 10 and the current sampled by the sampling circuit 20, and judge whether the power battery is short-circuited based on the temperature and the current. When the control circuit 30 detects that the temperature rise rate of the temperature of the switch circuit 10 within a preset time exceeds the temperature rise rate threshold or the temperature value exceeds the temperature value threshold, the control circuit 30 synchronously obtains the current sampled by the sampling circuit 20, and can consider the power battery to be short-circuited when the current is greater than the second preset current threshold and less than the first preset current threshold. The fuse of the power battery may not yet be triggered or blown due to the small short circuit current, at this time the control circuit 30 sends a control command to control the switch circuit 10, and the switch circuit 10 responds to the control command to cut it off, thereby protecting the power battery.

[0028] Illustratively, during the operation of the power battery, the switch circuit 10 obtains the temperature generated when the current flows through itself, the sampling circuit 20 samples the current flowing through the bus L1 by the battery pack 40, and the control circuit 30 obtains the temperature of the switch circuit 10 and the current sampled by the sampling circuit 20. When the control circuit 30 detects that the temperature rise rate of the switch circuit 10 within a preset time exceeds the temperature rise rate threshold or the temperature value exceeds the temperature value threshold, the control circuit 30 synchronously obtains the current sampled by the sampling circuit 20, and when the current current is greater than the second preset current threshold and less than the first preset current threshold, the control circuit 30 determines that the power battery is short-circuited and sends a control command to control the switch circuit 10, and the switch circuit 10 cuts off in response to the control command to protect the power battery.

[0029] In the power battery control system according to the embodiment of the present application, the control circuit determines whether the power battery is short-circuited by obtaining the temperature of the switch circuit and the current sampled by the sampling circuit. When the power battery is short-circuited, the control circuit sends a control command to control the switch circuit to be disconnected to protect the power battery. The power battery control system according to the embodiment of the present application can improve the accuracy of determining a short-circuit fault of the power battery and can deal with the short-circuit fault in a timely manner.

[0030] Optionally, FIG. 2 is a structural schematic diagram of another power battery control system according to an embodiment of the present application. Referring to FIG. 2, the switch circuit 10 includes a relay circuit 11 and a fuse circuit 12. The relay circuit 11 is connected between the battery pack 40 and the bus L1, and is configured to obtain a first temperature thereof and to cut off in response to a control command when the power battery is short-circuited. The fuse circuit 12 is connected between the battery pack 40 and the bus L1, and is configured to obtain a second temperature thereof and to melt down when the current of the power battery is greater than a first preset current threshold. The control circuit 30 is connected to the relay circuit 11 and the fuse circuit 12, and is configured to judge whether the power battery is short-circuited based on the first temperature and / or the second temperature and the current, and to send a control command based on the judgment result.

[0031] The control circuit 30 is configured to determine that the power battery is in a short-circuit state and send a control command when the current of the power battery is greater than the second preset current threshold and less than the first preset current threshold, the first temperature is greater than the first preset temperature threshold and / or the second temperature is greater than the second preset temperature threshold, and the first preset current threshold is greater than the second preset current threshold.

[0032] In some embodiments, the first preset temperature threshold includes a first temperature rise rate threshold and a first temperature value threshold, and the first temperature being greater than the first preset temperature threshold includes a temperature rise rate of the first temperature within the first preset time being greater than the first temperature rise rate threshold or a temperature value of the first temperature exceeding the first temperature value threshold.

[0033] In some embodiments, the second preset temperature threshold comprises a second temperature rise rate threshold and a second temperature value threshold, and the second temperature being greater than the second preset temperature threshold comprises a temperature rise rate of the second temperature within the second preset time being greater than the second temperature rise rate threshold or a temperature value of the second temperature exceeding the second temperature value threshold.

[0034] The first and second preset temperature thresholds are the temperature thresholds of the relay and fuse, respectively, and may be the same or different.

[0035] Specifically, the switch circuit 10 includes a relay circuit 11 and a fuse circuit 12. The relay circuit 11 can obtain a first temperature of heat generated by the flow of current, and can also control the interruption of the power battery circuit based on a control command. The fuse circuit 12 can obtain a second temperature of heat generated by the flow of current, and can protect the power battery by melting when the current of the power battery is greater than a first preset current threshold. The first preset current threshold is a current value at which the fuse circuit 12 can melt.

[0036] The control circuit 30 can determine the short circuit status of the power battery based on the acquired first temperature and second temperature. When the control circuit 30 detects that the first temperature rises rapidly or exceeds the first temperature value threshold within a first preset time, and / or the second temperature rises rapidly or exceeds the second temperature value threshold within a second preset time, and the fuse circuit 12 is not blown (i.e., the current of the power battery is smaller than the first preset current threshold), the control circuit 30 can obtain the current sampled by the sampling circuit 20, and determine that a short circuit fault has occurred in the power battery when the current is larger than the second preset current threshold but smaller than the first preset current threshold. At this time, the control circuit 30 transmits a control command to control the relay circuit 11 to cut off, thereby protecting the power battery. In this way, when a short circuit fault occurs, the power battery is protected in two ways, namely, passive cutoff by the fuse circuit and active cutoff by the relay circuit, thereby improving the safety of the power battery.

[0037] Optionally, still referring to FIG. 2, the relay circuit 11 includes a relay 13, a first temperature sensor 14, and a relay control subcircuit 15. The relay 13 is connected between the battery pack 40 and the bus L1, and is configured to disconnect when the power battery is short-circuited. The first temperature sensor 14 is connected to the relay 13 and configured to obtain a first temperature of the relay 13. The relay control subcircuit 15 is connected to the first temperature sensor 14 and the control circuit 30, respectively, and configured to output the first temperature to the control circuit 30 and control the switch state of the relay 13 based on a control command.

[0038] Specifically, the relay 13 is connected to the battery pack 40 and the bus L1, and the current of the bus L1 generates heat when it flows through the relay 13. The first temperature sensor 14 can obtain a first temperature of the relay 13 and output it to the relay control subcircuit 15. The control circuit 30 obtains the first temperature by the relay control subcircuit 15 and judges the short-circuit status of the power battery based on the first temperature and the current. When the power battery is short-circuited, the control circuit 30 transmits a control command, and the relay control subcircuit 15 receives the control command and controls the relay 13 to cut off, thereby realizing the protection of the power battery. In this way, it is possible to judge whether the power battery is short-circuited based on the temperature of the relay, and further improve the safety of the power battery.

[0039] Optionally, Fig. 3 is a structural schematic diagram of a relay circuit according to an embodiment of the present application. Taking Fig. 2 and Fig. 3 together, the first temperature sensor 14 is integrated in the relay control subcircuit 15, and the relay circuit 11 further includes a power line a and a communication line b. The power line a is connected between the relay control subcircuit 15 and the control circuit 30 and configured to transmit a control command by an electric signal. The communication line b is connected between the relay control subcircuit 15 and the control circuit 30 and configured to transmit a control command by a digital signal.

[0040] Specifically, the first temperature sensor 14 is integrated in the relay control subcircuit 15. The relay circuit 11 further includes a power line a and a communication line b in the relay control subcircuit 15, which is connected to the control circuit 30 via the power line a and the communication line b. When the power battery is short-circuited, the control command sent by the control circuit 30 can control the relay control subcircuit 15 in the form of an electric signal via the power line a, and can also control the relay control subcircuit 15 in the form of a digital signal via the communication line b. Exemplarily, the communication line can be a CAN bus, and the sent control command can be a CAN command. In this way, the control effect on the relay can be improved, the reliability of the relay control can be improved, and the safety of the power battery can be further improved.

[0041] Optionally, FIG. 4 is a structural schematic diagram of another power battery control system according to an embodiment of the present application. Referring to FIG. 4, the control circuit 30 includes a battery management circuit 31 and an entire vehicle controller 32. The battery management circuit 31 is connected to the relay control subcircuit 15, the sampling circuit 20 and the fuse circuit 12, and the relay control subcircuit 15 is connected to the battery management circuit 31 via a power line a. The battery management circuit 31 is configured to judge whether the power battery is short-circuited based on the first temperature and / or the second temperature and the current, and to send a first control command to the relay 13 based on the judgment result. The entire vehicle controller 32 is connected to the relay control subcircuit 15, that is, the relay control subcircuit is connected to the entire vehicle controller 32 via a communication line b, and the entire vehicle controller 32 is configured to send a second control command when the relay control subcircuit 15 does not respond to the first control command. The control command includes a first control command and a second control command.

[0042] Specifically, the control circuit 30 includes a battery management circuit 31 and an overall vehicle controller 32. The battery management circuit 31 is connected to the relay control subcircuit 15, the sampling circuit 20, and the fuse circuit 12, and acquires the first temperature, the second temperature, and the current to determine whether the power battery is short-circuited. If the power battery is short-circuited, the battery management circuit 31 transmits a first control command to control the relay control subcircuit 15, and further controls the relay 13 to be disconnected. If the battery management circuit 31 fails and cannot transmit the first control command, or if the relay control subcircuit 15 does not respond to the first control command, the overall vehicle controller 32 connected to the relay control subcircuit 15 transmits a second control command via the communication line to control the relay 13 to be disconnected. This further improves the reliability of the relay control and the safety of the power battery.

[0043] Optionally, FIG. 5 is a structural schematic diagram of a fuse circuit according to an embodiment of the present application. Combined with FIG. 4 and FIG. 5, the fuse circuit 12 includes a fuse 17 and a second temperature sensor 16. The fuse 17 is connected between the battery pack 40 and the bus L1, and is configured to melt when the current of the power battery is greater than a first preset current threshold. The second temperature sensor 16 is connected between the fuse 17 and the control circuit 30, and is provided on the casing of the fuse 17, and is configured to obtain a second temperature of the fuse 17.

[0044] Specifically, the fuse circuit 12 includes a fuse 17 and a second temperature sensor 16 provided on a casing of the fuse 17. The current of the bus L1 flows through the fuse 17 to generate heat, and when the current of the power battery is greater than a first preset current threshold, the fuse 17 melts to protect the power battery. The second temperature sensor 16 can obtain a second temperature of the fuse 17. The control circuit 30 obtains the second temperature by the second temperature sensor 16 and judges the short-circuit state of the power battery based on the second temperature and the current. When the power battery is short-circuited, the control circuit 30 transmits a control command to control the relay 13 to cut off, thereby realizing the protection of the power battery. In this way, it is possible to judge whether the power battery is short-circuited based on the temperature of the fuse, prevent damage to the power battery due to a short-circuit current caused by a slow melting of the fuse, and further improve the safety of the power battery.

[0045] Optionally, with continued reference to Figure 4, the sampling circuit 20 includes a sampler 21 and a third temperature sensor 22, the sampler 21 is connected between the switch circuit 10 and the bus L1 and connected to the control circuit 30 and configured to obtain a current of the power battery and modify the current based on a third temperature. The third temperature sensor 22 is connected to the sampler 21 and configured to obtain a third temperature of the sampler 21.

[0046] Specifically, the sampling circuit 20 includes a sampler 21 and a third temperature sensor 22, and the sampler 21 can sample the current flowing through the bus L1 of the battery pack 40, i.e., the current of the power battery. The third temperature sensor 22 can obtain a third temperature of heat generated when the current flows through the sampling circuit 20, and the sampler 21 can correct the sampled current based on the third temperature, which further improves the accuracy of the current and further improves the accuracy with which the control circuit judges whether the power battery is short-circuited.

[0047] Optionally, FIG. 6 is a structural schematic diagram of a sampling circuit according to an embodiment of the present invention. Combined with FIG. 4 and FIG. 6, the sampler 21 includes a conductor portion 23 and a processor 24. The conductor portion 23 is connected between the switch circuit 10 and the bus L1, and the third temperature sensor 22 is provided on the surface of the conductor portion 23, which is configured to conduct a current and measure the current of the power battery. The processor 24 is connected to the control circuit 30, provided on the surface of the conductor portion 23, and configured to obtain the current of the conductor portion 23 and correct the current based on the third temperature. In this way, the accuracy of the obtained current and temperature is further improved.

[0048] Specifically, the sampler 21 is provided with a conductor 23 and a processor 24 provided on the surface of the conductor 23, and a third temperature sensor 22 is also provided on the surface of the conductor 23. The conductor 23 is connected to the bus L1, and a current generated during operation of the battery pack 40 flows through the conductor 23 and generates heat. The third temperature sensor 22 obtains a third temperature of the conductor 23, and the sampler 21 obtains a voltage across the conductor 23 and calculates the current of the power battery based on the known resistance of the conductor 23. When a current flows through the conductor 23, its temperature changes, and its resistance value also changes. By obtaining the third temperature of the conductor 23, the resistance value of the conductor 23 can be corrected and the current can also be corrected.

[0049] Optionally, with continued reference to Figure 6, the conductor portion 23 includes a first surface and a second surface. The third temperature sensor 22 is disposed on the first surface of the conductor portion 23, and the processor 24 is disposed on the second surface of the conductor portion 23, with the first surface disposed adjacent to the second surface.

[0050] Specifically, the conductor portion 23 includes a first surface and a second surface that are adjacent to each other, the third temperature sensor 22 is provided on the first surface, and the processor 24 is provided on the second surface, and the processor 24 is connected to the third temperature sensor 22. By providing the processor 24 and the third temperature sensor 22 in adjacent positions, the accuracy of the acquired current can be improved, and the accuracy of the control circuit determining whether the power battery is short-circuited can be further improved.

[0051] Optionally, the area of ​​the first surface may be smaller than that of the second surface, and the third temperature sensor 22 with a smaller volume may be provided on the first surface with a smaller area, and the processor 24 with a larger volume may be provided on the second surface with a larger area, thereby reducing the volume of the sampling circuit, facilitating the improvement of the integration degree of the power battery control system, and reducing the volume of the power battery control system.

[0052] Illustratively, during operation of the power battery, the first temperature sensor 14 obtains a first temperature of the relay 13 and outputs it to the relay control subcircuit 15. The second temperature sensor 16 obtains a second temperature of the fuse 17. The sampler 21 samples the current flowing through the bus L1 by the battery pack 40 and corrects the sampled current based on a third temperature obtained by the third temperature sensor 22. The battery management circuit 31 determines whether the power battery is short-circuited based on the obtained first temperature, second temperature and current.

[0053] When the first temperature increases rapidly within a first preset time and / or the second temperature increases rapidly within a second preset time and exceeds the preset temperature threshold, the fuse 17 is not blown, and the current is greater than the second preset current threshold but less than the first preset current threshold, it can be determined that a short circuit fault occurs in the power battery. At this time, the battery management circuit 31 sends a first control command to the relay control subcircuit 15 to control the relay 13 to cut off.

[0054] When the battery management circuit 31 fails and cannot send the first control command or the relay control subcircuit 15 does not respond to the first control command, the vehicle overall controller 32 connected to the relay control subcircuit 15 sends a second control command via the communication line to control the relay 13 to be disconnected. The power battery control system according to this embodiment realizes improved accuracy in determining a short-circuit fault of the power battery, and can deal with the short-circuit fault in a timely manner, thereby improving the safety of the power battery.

[0055] Optionally, Fig. 7 is a structural schematic diagram of a battery pack according to an embodiment of the present application. Referring to Fig. 7, the power battery 200 according to the embodiment of the present application includes the power battery control system 100, and has the beneficial effects of the power battery control system 100 according to any of the above embodiments, which will not be further described here.

[0056] 8 is a flow chart of a method for controlling a power battery according to an embodiment of the present application. The power battery includes a battery pack, a bus, and a control system, such as the control system 100 in any of the above embodiments or combinations thereof. Referring to FIG. 8, the method for controlling a power battery according to an embodiment of the present application includes the following steps:

[0057] S101, obtaining a temperature of a switch circuit and a first current collected by a sampling circuit.

[0058] Specifically, the switch circuit of the power battery can control the working state of the power battery circuit, and when the switch circuit is disconnected, the power battery stops working, and when the switch circuit is conductive, the power battery works. During the working of the power battery, a current flows through the switch circuit and generates heat. By obtaining the temperature of the switch circuit and the first current of the power battery collected by the sampling circuit, the working state of the power battery can be determined.

[0059] S102, determining an operating state of the power battery based on the temperature and the first current.

[0060] The operating conditions include a normal operating condition and an overload condition.

[0061] Specifically, the operating state of the power battery can be determined based on the temperature of the switch circuit and the first current collected by the sampling circuit. When the temperature of the switch circuit exceeds a safe temperature threshold and the first current collected by the sampling circuit exceeds a safe current threshold, it can be determined that the power battery is in an overload state. In this way, the state of the power battery can be determined based on the temperature and current of the power battery, improving accuracy.

[0062] S103, controlling the power battery to operate under a normal operating condition by adjusting operating parameters of the power battery according to the overload state of the power battery.

[0063] Specifically, when the power battery is in an overload state, the current inside the power battery is greater than the safe current threshold, and the temperature rises to exceed the safe temperature threshold, and a safety failure will occur if the power battery continues to operate. At this time, it is necessary to adjust the operating parameters of the power battery, for example by reducing the output, to reduce the current output by the power battery, and gradually reduce the temperature, so that the power battery returns to a normal operating state. In this way, the normal operation of the power battery is maintained and the safety of the power battery is improved.

[0064] For example, the power battery obtains the temperature of the switch circuit and the first current collected by the sampling circuit during operation. When the temperature of the switch circuit exceeds a safe temperature threshold and the first current collected by the sampling circuit exceeds a safe current threshold, it can be determined that the power battery is in an overloaded state. At this time, it is necessary to adjust the operating parameters of the power battery, for example, by reducing the output, thereby reducing the current of the power battery and gradually decreasing the temperature, so that the power battery returns to a normal operating state.

[0065] The battery control method according to the present embodiment determines the operating state of the power battery by acquiring the temperature of the switch circuit and the first current collected by the sampling circuit, and when the power battery is in an overload state, adjusts the operating parameters of the power battery to control the power battery to operate in a normal operating state, thereby realizing the maintenance of the normal operation of the power battery and improving the safety of the power battery.

[0066] Optionally, Figure 9 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 9, the power battery control method according to an embodiment of the present application includes the following steps:

[0067] S201, obtain the first temperature of the relay;

[0068] Specifically, the switch circuit includes a relay and a fuse, the relay is configured to control the interruption of the power battery circuit, and a current of the power battery generates a first temperature when flowing through the relay, and the first temperature may be set to determine the operating state of the power battery.

[0069] S202, obtain the second temperature of the fuse.

[0070] The switch circuit includes a relay and a fuse, and for details, please refer to the description of the above embodiment, and will not be described further here.

[0071] Specifically, the fuse is configured to blow to protect the power battery when the power battery current exceeds a preset threshold, for example, fuse 17 is configured to blow to protect the power battery when the power battery current exceeds a first preset current threshold. The power battery current generates a second temperature when flowing through the fuse, and the second temperature may be configured to determine the operating state of the power battery.

[0072] S203, obtaining a first current collected by a sampling circuit.

[0073] Specifically, a conductor section is provided in the sampling circuit, and the sampling circuit can collect the voltage of the conductor section and calculate a first current during operation of the power battery based on the known resistance of the conductor section. The first current may be set to determine the operating state of the power battery. In this way, the state of the power battery can be determined by multiple parameters, further improving accuracy.

[0074] S102, determine an operating state of the power battery based on the temperature and the first current, the operating state including a normal operating state and an overload state, and the temperature including a first temperature of the relay and a second temperature of the fuse.

[0075] S103, controlling the power battery to operate under a normal operating condition by adjusting operating parameters of the power battery according to the overload state of the power battery.

[0076] Optionally, Figure 10 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 10, the power battery control method according to an embodiment of the present application includes the following steps:

[0077] S201, obtain the first temperature of the relay;

[0078] S202, obtain the second temperature of the fuse.

[0079] S203, obtaining a first current collected by a sampling circuit.

[0080] S301, comparing a first temperature of the relay within a first preset time with a first preset threshold value to obtain a first comparison result.

[0081] Specifically, during normal operation of the power battery, a first temperature of the relay is less than or equal to a first preset threshold, and when the first temperature exceeds the first preset threshold, the power battery may be in an overload state.

[0082] In some embodiments, a first temperature of the relay within a first preset time period can be compared with a first preset threshold value, and an operating status of the power battery can be determined based on a first comparison result.

[0083] S302, comparing a second temperature of the fuse within a second preset time with a second preset threshold value to obtain a second comparison result.

[0084] Specifically, during normal operation of the power battery, the second temperature of the fuse is less than or equal to a second preset threshold, and if the second temperature exceeds the second preset threshold, the power battery may be in an overload state.

[0085] In some embodiments, the second temperature of the fuse within the second preset time can be compared with a second preset threshold, and the operating status of the power battery can be determined based on the second comparison result.

[0086] In this embodiment, the switch circuit includes a relay and a fuse, and the safe temperature threshold includes a first preset threshold and a second preset threshold.

[0087] In addition, the first preset time may be the same as the second preset time or may be different from the second preset time, and the first preset threshold may be the same as the second preset threshold or may be different from the second preset threshold, and are not limited here.

[0088] The first and second preset temperature thresholds are set to determine whether the power battery is in a short circuit state. The first and second preset thresholds are set to determine whether the power battery is in an overload state. In some embodiments, the first and second preset temperature thresholds are higher than the first and second preset thresholds, respectively.

[0089] S303, comparing the first current collected by the sampling circuit with a third preset threshold to obtain a third comparison result.

[0090] Specifically, during normal operation of the power battery, a first current of the power battery collected by the sampling circuit is less than or equal to a third preset threshold. If the first current exceeds the third preset threshold, the power battery may be in an overload state. The first current can be compared with the third preset threshold, and the operating state of the power battery can be determined based on the third comparison result. In some embodiments, the third preset threshold and the safe current threshold are the same.

[0091] S304, determining an operating state of the power battery according to the first comparison result, the second comparison result and the third comparison result.

[0092] Specifically, based on the first comparison result, it can be determined whether the temperature of the relay increases rapidly within a first preset time and exceeds a first preset threshold. Based on the second comparison result, it can be determined whether the temperature of the fuse increases rapidly within a second preset time and exceeds a second preset threshold. Based on the third comparison result, it can be determined whether the current of the power battery exceeds a third preset threshold. Based on the temperature change status of the relay, the temperature change status of the fuse, and the current change status of the power battery, the operating state of the power battery can be determined.

[0093] S103, controlling the power battery to operate under a normal operating condition by adjusting operating parameters of the power battery according to the overload state of the power battery.

[0094] The preset current threshold is set to determine whether the power battery is in an overloaded state, and the first and second preset current thresholds are set to determine whether the power battery is in a short-circuited state.

[0095] In some embodiments, the preset current threshold, the safe current threshold, and the third preset threshold are the same.

[0096] In some embodiments, the first preset current threshold is greater than the second preset current threshold, and the second preset current threshold is greater than the first preset current threshold.

[0097] Optionally, Figure 11 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 11, the power battery control method according to an embodiment of the present application includes the following steps:

[0098] S201, obtain the first temperature of the relay.

[0099] S202, obtain the second temperature of the fuse.

[0100] S203, obtaining a first current collected by a sampling circuit.

[0101] S301, comparing a first temperature of the relay within a first preset time with a first preset threshold value to obtain a first comparison result.

[0102] S302, comparing a second temperature of the fuse within a second preset time with a second preset threshold value to obtain a second comparison result.

[0103] S303, comparing the first current of the sampling circuit with a third preset threshold value to obtain a third comparison result.

[0104] S401, determine that the power battery is in an overload state when a first temperature within a first preset time exceeds a first preset threshold and / or a second temperature within a second preset time exceeds a second preset threshold, and a first current exceeds a third preset threshold.

[0105] Specifically, when the first temperature of the relay within the first preset time exceeds the first preset threshold and / or the second temperature of the fuse within the second preset time exceeds the second preset threshold, and the first current collected by the sampling circuit exceeds the third preset threshold, the power battery can be considered to be in an overloaded state and its operating parameters need to be adjusted. In this way, the operating state of the power battery can be judged based on multiple judgment criteria, which makes it easy to handle in a timely manner and further improves the safety of the power battery.

[0106] S103, controlling the power battery to operate under a normal operating condition by adjusting operating parameters of the power battery according to the overload state of the power battery.

[0107] Optionally, Figure 12 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 12, the power battery control method according to an embodiment of the present application includes the following steps:

[0108] S101, obtaining a temperature of a switch circuit and a first current collected by a sampling circuit.

[0109] S102, determining an operating state of the power battery, including a normal operating state and an overload state, based on the temperature and the first current.

[0110] S501, when the power battery is in an overload state, control the power battery to reduce the output.

[0111] Specifically, when the power battery is in an overload state, the device inside the power battery receives a current that exceeds the current carrying capacity, so the temperature gradually rises, and if the device is in an overload state for a long time, it will cause a safety accident of the power battery. At this time, it is necessary to reduce the output of the power battery to reduce the current inside the power battery, thereby protecting the power battery. In this way, the service life of the power battery can be extended and costs can be saved.

[0112] Optionally, Figure 13 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 13, the power battery control method according to an embodiment of the present application includes the following steps:

[0113] S101, obtaining a temperature of a switch circuit and a first current collected by a sampling circuit.

[0114] S102, determining an operating state of the power battery, including a normal operating state and an overload state, based on the temperature and the first current.

[0115] S501, when the power battery is in an overload state, control the power battery to reduce the output.

[0116] S601, obtaining a second current collected by a sampling circuit.

[0117] Specifically, after reducing the output of the power battery, the second current of the power battery collected by the sampling circuit can be acquired again to confirm the magnitude of the current of the power battery.

[0118] S602, comparing the second current and the first current collected by the sampling circuit within a third preset time period to obtain a fourth comparison result.

[0119] Specifically, after a third preset time after the power battery reduces its output, the second current collected by the sampling circuit is compared with the first current, and based on the comparison result, it is determined whether the current of the power battery has reduced, thereby determining whether the power battery has failed.

[0120] S603, determine the fault status of the power battery based on the fourth comparison result. Specifically, if the second current is smaller than the first current, it can be determined that the output of the power battery has decreased. If the second current is equal to or greater than the first current, the output of the power battery has not decreased, and it is necessary to determine whether the power battery has failed and take corresponding action on the power battery accordingly. In this way, the safety of the power battery is further improved.

[0121] Optionally, Figure 14 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 14, the power battery control method according to an embodiment of the present application includes the following steps:

[0122] S101, obtaining a temperature of a switch circuit and a first current collected by a sampling circuit.

[0123] S102, determining an operating state of the power battery, including a normal operating state and an overload state, based on the temperature and the first current.

[0124] S501, when the power battery is in an overload state, control the power battery to reduce the output.

[0125] S601, obtaining a second current collected by a sampling circuit.

[0126] S602, comparing the second current and the first current in the sampling circuit within a third preset time period to obtain a fourth comparison result.

[0127] S701, if the second current is smaller than the first current, it is determined that the power battery is not faulty.

[0128] Specifically, when the second current is smaller than the first current, the current of the power battery decreases after the power battery reduces its output, which indicates that the power battery is working normally and is not faulty.

[0129] S702, determining that a short circuit fault occurs in the power battery when the second current is equal to or greater than the first current.

[0130] Specifically, when the second current is equal to or greater than the first current, the power battery performs an operation to reduce the output, but the current of the power battery does not actually decrease, and it can be considered that an external short circuit fault occurs in the power battery. That is, in addition to the overload state and the normal operating state, the power battery also has a short circuit state.

[0131] Optionally, Figure 15 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 15, the power battery control method according to an embodiment of the present application includes the following steps:

[0132] S101, obtaining a temperature of a switch circuit and a first current collected by a sampling circuit.

[0133] S102, determining an operating state of the power battery, including a normal operating state and an overload state, based on the temperature and the first current.

[0134] S501, when the power battery is in an overload state, control the power battery to reduce the output.

[0135] S601, obtaining a second current collected by a sampling circuit.

[0136] S602, comparing the second current and the first current in the sampling circuit within a third preset time period to obtain a fourth comparison result.

[0137] S603, determining a fault status of the power battery based on the fourth comparison result.

[0138] S801: When a short circuit occurs in the power battery, control is performed to cut off the relay. Specifically, when a short circuit occurs in the power battery, it is necessary to protect the power battery by cutting off the relay to cut off the power battery circuit. The relay can be controlled to be cut off by the battery management circuit, or it can be controlled to be cut off by the entire vehicle relay. In this way, the power battery is further protected and safety is improved.

[0139] Optionally, Figure 16 is a flow chart of another power battery control method according to an embodiment of the present application. Referring to Figure 16, the power battery control method according to an embodiment of the present application includes the following steps:

[0140] S201, obtain the first temperature of the relay;

[0141] S202, obtain the second temperature of the fuse.

[0142] S203, obtaining a first current collected by a sampling circuit.

[0143] In this embodiment, in order to ensure the accuracy of the collected first current, the first current is corrected by the sampling circuit, specifically, In S901, a third temperature of the sampling circuit is obtained.

[0144] Specifically, the temperature of the power battery can be confirmed by acquiring the third temperature of the sampling circuit, the third temperature being the temperature generated when the current of the power battery flows through the conductor part of the sampling circuit. The resistance value of the conductor part is affected by the temperature of the conductor part, which further affects the magnitude of the current flowing through the conductor part. By acquiring the third temperature, the current sampled by the sampling circuit can be corrected. As described above, the third temperature of the sampling circuit can be acquired by the third temperature sensor in the sampling circuit.

[0145] In S902, the first current is modified based on the third temperature.

[0146] Specifically, the resistance value of the conductor portion can be corrected based on the third temperature generated when the current of the power battery flows through the conductor portion of the sampling circuit, and the first current acquired by the sampling circuit can be further corrected, thereby ensuring the accuracy of the sampled current. As described above, the first current can be corrected by the processor in the sampling circuit.

[0147] S102, determine an operating state of the power battery based on the temperature and the first current, the operating state including a normal operating state and an overload state, and the temperature including a first temperature of the relay and a second temperature of the fuse.

[0148] S103, controlling the power battery to operate under a normal operating condition by adjusting operating parameters of the power battery according to the overload state of the power battery.

[0149] Illustratively, during operation, the power battery obtains a first temperature of the relay, a second temperature of the fuse, a third temperature of the sampling circuit, and a first current collected by the sampling circuit, and the sampling circuit modifies the first current based on the third temperature, compares the first temperature of the relay within a first preset time with a first preset threshold, compares the second temperature of the fuse within a second preset time with a second preset threshold, and compares the first current sampled by the sampling circuit with a third preset threshold.

[0150] When the first temperature of the relay within the first preset time exceeds the first preset threshold and / or the second temperature of the fuse within the second preset time exceeds the second preset threshold, and the first current collected by the sampling circuit exceeds the third preset threshold, the power battery can be considered to be in an overload state, and at this time, it is necessary to reduce the output of the power battery to reduce the current inside the power battery, thereby protecting the power battery.

[0151] After a third preset time has elapsed since the power battery reduced its output, the second current collected by the sampling circuit is compared with the first current, and if the second current is equal to or greater than the first current, it indicates that the power battery has reduced its output, but the current of the power battery has not actually decreased, and a short circuit fault has occurred in the power battery. At this time, the battery management system or the entire vehicle relay is controlled to cut off the relay, further protecting the power battery. The battery control method according to this embodiment realizes maintaining the normal operation of the power battery and improves the safety of the power battery.

[0152] Optionally, FIG. 17 is a structural schematic diagram of a control circuit according to an embodiment of the present invention. Referring to FIG. 17, the control circuit 30 according to an embodiment of the present invention includes: an acquisition module 171 configured to acquire the temperature of the switch circuit and the first current collected by the sampling circuit; a determination module 172 configured to determine an operating state of the power battery, including a normal operating state and an overload state, based on the temperature and the first current; and an adjustment module 173 configured to control the power battery to operate under normal operating conditions by adjusting operating parameters of the power battery based on an overload condition of the power battery.

[0153] The control circuit according to the embodiment of the present application obtains the temperature of the switch circuit and the first current collected by the sampling circuit. Based on the temperature and the first current, it determines an operating state of the power battery, including a normal operating state and an overload state. Based on the operating state of the power battery, it adjusts the operating parameters of the power battery to control the power battery to operate in the normal operating state. By determining the operating state of the power battery, it is possible to maintain the normal operation of the power battery and improve the safety of the power battery by adjusting the operating parameters of the power battery.

[0154] It should be understood that the above-mentioned various types of processes can be used, steps can be rearranged, added, or removed. For example, each step described in this application can be performed in parallel, sequentially, or in a different order. As long as the technical solution of this application can achieve the desired results, this specification is not limited here. [Explanation of symbols]

[0155] Control system: 100, switch circuit: 10, sampling circuit: 20, control circuit: 30, battery pack: 40, bus: L1, Relay circuit: 11, fuse circuit: 12, relay: 13, first temperature sensor: 14, relay control subcircuit: 15, Power line: a, communication line: b, Second temperature sensor: 16, fuse: 17, sampler: 21, third temperature sensor: 22, battery management circuit: 31, whole vehicle controller: 32, Conductor: 23, processor: 24, Power battery 200, S101-S103, S201-S203, S301-S304, S401, S501, S601-S603, S701-S702, S801, S901-S902: Step Acquisition module: 171, judgment module: 172, adjustment module 173.

Claims

1. A control system for a power battery, the power battery including a battery pack and a bus, the control system including: a switch circuit connected between the battery pack and the bus and configured to obtain and output a temperature of the switch circuit; a sampling circuit connected between the switch circuit and the bus and configured to sample a current of the battery pack; a control circuit connected to the switch circuit and the sampling circuit and configured to determine a state of the power battery based on a temperature of the switch circuit and a current of the battery pack, and to control the power battery to perform a corresponding operation based on the state of the power battery.

2. 2. The control system according to claim 1, wherein the states of the power battery include a short circuit state, an overload state and a normal operating state, and the operation corresponding to the short circuit state is to control the switch circuit to be disconnected, and the operation corresponding to the overload state is to control and adjust the operating parameters of the power battery to bring the power battery into the normal operating state.

3. the switch circuit includes a relay and a fuse, the relay is connected between the battery pack and the bus, and the fuse is connected between the battery pack and the bus; the temperature of the switch circuit includes a first temperature of the relay and / or a second temperature of the fuse; The control system of claim 1 , wherein the control circuit determines a current state of the power battery based on a first temperature of the relay and / or a second temperature of the fuse and a current of the battery pack.

4. 4. The control system of claim 3, wherein in response to the current of the battery pack exceeding a preset current threshold and the first temperature of the relay exceeding a first preset threshold within a first preset time and / or the second temperature of the fuse exceeding a second preset threshold within a second preset time, the control circuit determines that a current state of the power battery is an overload state.

5. 4. The control system of claim 3, wherein in response to the current of the battery pack being less than a first preset current threshold and greater than a second preset current threshold, and the first temperature of the relay being greater than a first preset temperature threshold and / or the second temperature of the fuse being greater than a second preset temperature threshold, the control circuit determines that a current state of the power battery is a short-circuit state, and the first preset current threshold is greater than the second preset current threshold.

6. in response to the current of the battery pack being less than the first preset current threshold and greater than the second preset current threshold, and a temperature rise rate of a first temperature of the relay within a first preset time period being greater than a first temperature rise rate threshold and / or a temperature rise rate of a second temperature of the fuse within a second preset time period being greater than a second temperature rise rate threshold, the control circuit determines that a current state of the power battery is the short-circuit state; or 6. The control system of claim 5, wherein in response to the current of the battery pack being less than the first preset current threshold and greater than the second preset current threshold, and the temperature value of the first temperature of the relay exceeding a first temperature value threshold and / or the temperature value of the second temperature of the fuse exceeding a second temperature value threshold, the control circuit determines that the current state of the power battery is the short-circuit state.

7. the sampling circuit samples a first current of the battery pack; The control circuit determines that the current state of the power battery is the overload state based on the temperature of the switch circuit and the first current of the battery pack, and controls and adjusts an operating parameter of the power battery to bring the power battery into the normal operating state; The sampling circuit samples a second current of the battery pack within a third preset time period after the control circuit controls and adjusts an operating parameter of the power battery; 3. The control system of claim 2, wherein the control circuit further obtains the second current and, in response to the second current being greater than or equal to the first current, determines that a present state of the power battery is to change to the short-circuit state.

8. said adjusting an operating parameter of said power battery comprising: A control system according to any one of claims 2 to 7, comprising reducing the output of the power battery.

9. the switch circuit includes a relay, a first temperature sensor, and a relay control subcircuit, the relay is connected between the battery pack and the bus, the first temperature sensor is connected to the relay and configured to obtain a first temperature of the relay, the relay control subcircuit is connected to the first temperature sensor, The control circuit includes: a battery management circuit coupled to the relay control subcircuit and configured to send a first control command in response to the first temperature and a current in the battery pack, such that the relay control subcircuit responds to the first control command to control the relay to disconnect, thereby controlling the switch circuit to disconnect; and a whole-vehicle controller connected to the relay control subcircuit and configured to send a second control command when the first control command has not been sent or the relay control subcircuit is not responsive to the first control command, thereby controlling the relay control subcircuit to respond to the second control command and to disconnect the relay, thereby disconnecting the switch circuit.

10. the battery management circuit is connected to the relay control subcircuit via a power line to transmit the first control command; the whole-vehicle controller is connected to the relay control subcircuit via a communication line to transmit the second control command; And / or the first temperature sensor is integrated within the relay control sub-circuit.

11. The sampling circuit includes: a conductor portion connected between the switch circuit and the bus and configured to conduct current; a third temperature sensor provided on a surface of the conductor and configured to acquire a temperature of the conductor as a third temperature of the sampling circuit; A control system as described in any one of claims 1 to 7, comprising: a processor connected to the third temperature sensor and the control circuit, provided on a surface of the conductor portion, and configured to acquire the third temperature and the current of the battery pack, and to modify the current of the battery pack based on the third temperature.

12. the surface of the conductor portion includes a first surface and a second surface, 12. The control system of claim 11, wherein the third temperature sensor is disposed on a first surface of the conductor and the processor is disposed on a second surface of the conductor, and the first surface is adjacent to the second surface.

13. The switch circuit includes: a fuse coupled between the battery pack and the bus, the fuse configured to blow when a current in the battery pack is greater than a first preset current threshold; and a second temperature sensor connected to the fuse and the control circuit respectively and provided on a casing of the fuse, the second temperature sensor configured to obtain a second temperature of the fuse.

14. A power battery comprising: a battery pack; a bus; and a control system according to any one of claims 1-7 connected between the battery pack and the bus.

15. A method for controlling a power battery, the power battery including a battery pack, a bus, and a control system according to any one of claims 1 to 7 connected between the battery pack and the bus, the control method comprising: the control circuit acquires the temperature of the switch circuit and the current of the battery pack sampled by the sampling circuit; The control circuit determines a state of the power battery based on the temperature of the switch circuit and the current of the battery pack, and controls the control circuit to perform a corresponding operation based on the state of the power battery.

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