Power battery, its control system, and control method

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 the priority of a Chinese patent application filed with the Chinese Patent Office on June 30, 2023, with an application number of 202321712941.9, the priority of a Chinese patent application filed with the Chinese Patent Office on June 30, 2023, with an application number of 202310802676.1, and the priority of an international patent application filed with the World Intellectual Property Organization on June 12, 2024, with a PCT international application number of PCT / CN2024 / 098786. All the contents of the above applications are incorporated herein by reference.

[0002] This application relates to the field of battery technology, specifically to power batteries, their control systems, and control methods.

Background Art

[0003] Power batteries are widely used in many fields such as electric vehicles. When a failure such as overload or short circuit occurs in a power battery, a great safety risk will occur.

[0004] In related technologies, the state monitoring effect of power batteries is poor, and it is difficult to detect and respond to the state of power batteries in a timely manner, so power batteries are not safe.

Summary of the Invention

Means for Solving the Problems

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

[0006] According to a second aspect, the present embodiment provides a 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.

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

[0008] [Figure 1] This is a schematic diagram of the structure of the control system for a power battery according to the present embodiment. [Figure 2] This is a schematic diagram of the structure of another power battery control system according to the embodiment of the present invention. [Figure 3] This is a schematic diagram of the structure of a relay circuit according to the present embodiment. [Figure 4]This is a schematic diagram of the structure of another power battery control system according to the embodiment of the present invention. [Figure 5] This is a schematic diagram of the structure of a fuse circuit according to the present embodiment. [Figure 6] This is a schematic diagram of the sampling circuit structure according to the present embodiment. [Figure 7] This is a schematic diagram of the structure of a power battery according to the present embodiment. [Figure 8] This is a flowchart of the control method for the power battery according to the present embodiment. [Figure 9] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 10] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 11] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 12] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 13] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 14] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 15] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 16] This is a flowchart of a control method for another power battery according to the embodiment of the present invention. [Figure 17] This is a schematic diagram of the control circuit structure according to the present embodiment. [Modes for carrying out the invention]

[0009] Furthermore, terms such as “First,” “Second,” etc., in the specification, claims, and drawings of this application are not necessary to describe a specific order or priority, but are intended to distinguish similar objects. It should be understood that the data used in this manner is interchangeable where appropriate, so that the embodiments of this application described herein can be carried out in any order other than those illustrated or described herein. Also, the terms “includes” and “has,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are specific to those processes, methods, products, or apparatus.

[0010] In related technologies, the effectiveness of monitoring the state of the power battery is poor, making it difficult to detect and react to the power battery's condition in a timely manner, thus compromising the safety of the power battery. For example, the effectiveness of monitoring the overload of the power battery is poor, making it difficult to detect and react to an overload in a timely manner, thus compromising the safety of the power battery. Also, for example, if a short-circuit fault occurs in the power battery, passive short-circuit protection is usually provided only by blowing the fuse. However, because the short-circuit current in the circuit is small and cannot blow the fuse rapidly, the conductors in the circuit may receive a current that exceeds their carrying capacity, potentially creating a danger to the power battery, resulting in low sensitivity to protection against short-circuit faults.

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

[0012] In some embodiments, the state of the power battery includes a short - circuit state, an overload state, and a normal operation state. The operation corresponding to the short - circuit state is to control to disconnect the switch circuit, and the operation corresponding to the overload state is to control and adjust the operation parameters of the power battery to make the power battery in the normal operation 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 the first temperature of the relay and / or the second temperature of the fuse. The control circuit determines the 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 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 the current state of the power battery is an overload state.

[0015] In some embodiments, in response to the current of the battery pack being smaller than a first preset current threshold and larger than a second preset current threshold, and the first temperature of the relay being higher than a first preset temperature threshold and / or the second temperature of the fuse being higher than a second preset temperature threshold, the control circuit determines that the current state of the power battery is a short - circuit state. The first preset current threshold is larger 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 a first preset time being greater than a first temperature rise rate threshold and / or the temperature rise rate of the second temperature of the fuse within a second preset time being greater than a 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 the 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, controls and adjusts the operating parameters of the power battery to bring the power battery to a normal operating state. 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, 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 the current state of the power battery has changed to a short circuit state.

[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, wherein the relay is connected between the battery pack and the bus, the first temperature sensor is connected to the relay and configured to acquire a first temperature of the relay, the relay control subcircuit is connected to the first temperature sensor, the control circuit is connected to the relay control subcircuit and configured to transmit a first control command in response to the first temperature and the current of the battery pack, thereby controlling the relay control subcircuit to disconnect the relay in response to the first control command, and thereby controlling the switch circuit, and the whole vehicle controller is connected to the relay control subcircuit and transmits a second control command when the first control command has not been transmitted 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, and thereby controlling the switch circuit.

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

[0021] In some embodiments, the sampling circuit includes a conductor connected between a switch circuit and a bus and configured to conduct current; a third temperature sensor provided on the surface of the conductor and configured to acquire the temperature of the conductor 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 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.

[0022] In some embodiments, the surface of the conductor portion includes a first surface and a second surface, a third temperature sensor is provided on the first surface of the conductor portion, and a processor is provided on the second surface of the conductor portion, with the first surface 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 the current of 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 provided in the fuse casing and configured to obtain a second temperature of the fuse.

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

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

[0026] Figure 1 is a schematic diagram of the structure of a power battery control system according to an embodiment of the present invention. Referring to Figure 1, the power battery control system 100 according to an embodiment of the present invention includes a switch circuit 10, a sampling circuit 20, and a control circuit 30. The switch circuit 10 is connected between the battery pack 40 and the bus L1. The switch circuit 10 is configured to acquire 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 determine whether the power battery is short-circuited or overloaded based on the temperature and current, and to send a control command to the switch circuit 10 based on the determination result. The switch circuit 10 is configured to disconnect in response to the control command when the power battery is short-circuited.

[0027] Specifically, the power battery pack 40 is connected to bus L1 via a switch circuit 10 and a sampling circuit 20. During the operation of the battery pack 40, the current flowing through bus L1 generates heat in the switch circuit 10, and the switch circuit 10 can acquire the temperature generated when the current flows through it. The sampling circuit 20 can sample the current flowing through bus L1 from the battery pack 40. The current in the battery pack 40 can represent the current of the power battery. The control circuit 30 acquires the temperature of the switch circuit 10 and the current sampled by the sampling circuit 20, and can determine whether the power battery is short-circuited based on the temperature and current. When the control circuit 30 detects that the temperature rise rate of the switch circuit 10 within a preset time exceeds a temperature rise rate threshold or that the temperature value exceeds a temperature value threshold, the control circuit 30 synchronously acquires the current sampled by the sampling circuit 20, and if the current is greater than a second preset current threshold and less than a first preset current threshold, it can be considered that the power battery is short-circuited. The fuse in the power battery may not have been triggered or blown yet due to the small short-circuit current. In this case, the control circuit 30 sends a control command to control the switch circuit 10, and the switch circuit 10 protects the power battery by disconnecting in response to the control command.

[0028] For example, during the operation of the power battery, the switch circuit 10 acquires the temperature generated when current flows through it, the sampling circuit 20 samples the current flowing through the bus L1 of the battery pack 40, and the control circuit 30 acquires 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 a temperature rise rate threshold or that the temperature value exceeds a temperature value threshold, the control circuit 30 synchronously acquires the current sampled by the sampling circuit 20, and if the current current is greater than a second preset current threshold and less than a first preset current threshold, the control circuit 30 determines that the power battery has short-circuited, sends a control command to control the switch circuit 10, and the switch circuit 10 protects the power battery by disconnecting in response to the control command.

[0029] In the power battery control system according to this embodiment, the control circuit determines whether or not the power battery is short-circuited by obtaining the temperature of the switch circuit and the current sampled by the sampling circuit. If the power battery is short-circuited, the control circuit protects the power battery by sending a control command to disconnect the switch circuit. The power battery control system according to this embodiment improves the accuracy of determining short-circuit failures in the power battery and enables timely handling of short-circuit failures.

[0030] Selectively, Figure 2 is a schematic diagram of the structure of another power battery control system according to an embodiment of the present invention. Referring to Figure 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, acquires a first temperature of its own, and is configured to disconnect 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, acquires a second temperature of its own, and is configured to blow when the power battery current 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 determine whether the power battery is short-circuited based on the first temperature and / or the second temperature and current, and to transmit a control command based on the determination result.

[0031] The control circuit 30 is configured to determine that the power battery is in a short-circuit state and transmit a control command when the current of the power battery is greater than a second preset current threshold and less than a first preset current threshold, the first temperature is greater than a first preset temperature threshold and / or the second temperature is greater than a second preset temperature threshold. 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. The first temperature being greater than the first preset temperature threshold includes the temperature rise rate of the first temperature within a first preset time being greater than the first temperature rise rate threshold, or the temperature value of the first temperature exceeding the first temperature value threshold.

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

[0034] The first preset temperature threshold and the second preset temperature threshold are the temperature thresholds for the relay and the fuse, respectively, and they 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 and continuity 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 blowing the fuse when the current of the power battery is greater than a first preset current threshold. The first preset current threshold is the current value at which the fuse circuit 12 can blow.

[0036] The control circuit 30 can determine the short-circuit status of the power battery based on the acquired first and second temperatures. When the control circuit 30 detects that the first temperature has risen rapidly or exceeded the first temperature threshold within a first preset time, and / or that the second temperature has risen rapidly or exceeded the second temperature threshold within a second preset time, and that the fuse circuit 12 has not blown (i.e., the power battery current is less than the first preset current threshold), the control circuit 30 acquires the current sampled by the sampling circuit 20, and if the current is greater than the second preset current threshold but less than the first preset current threshold, it can determine that a short-circuit failure has occurred in the power battery. At this time, the control circuit 30 protects the power battery by sending a control command to control the relay circuit 11 to disconnect. In this way, when a short-circuit failure occurs, the power battery is protected in two ways: passive disconnection by the fuse circuit and active disconnection by the relay circuit, thereby improving the safety of the power battery.

[0037] As can be selected, and continuing to refer to Figure 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 is configured to acquire the 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 is configured to output the first temperature to the control circuit 30 and control the switch state of the relay 13 based on control commands.

[0038] Specifically, relay 13 is connected to battery pack 40 and bus L1, and the current from bus L1 generates heat when it flows through relay 13. First temperature sensor 14 can acquire the first temperature of relay 13 and output it to relay control subcircuit 15. Control circuit 30 acquires the first temperature from relay control subcircuit 15 and determines the short-circuit status of the power battery based on the first temperature and current. If the power battery is short-circuited, control circuit 30 sends a control command, and relay control subcircuit 15 acquires the control command and controls relay 13 to disconnect, thereby protecting the power battery. In this way, it is possible to determine whether or not the power battery is short-circuited based on the temperature of the relay, further improving the safety of the power battery.

[0039] As selectable, Figure 3 is a schematic diagram of the relay circuit structure according to an embodiment of the present invention. Combining Figures 2 and 3, the first temperature sensor 14 is integrated into the relay control subcircuit 15, and the relay circuit 11 further includes power line a and communication line b. Power line a is connected between the relay control subcircuit 15 and the control circuit 30 and is configured to transmit control commands as electrical signals. Communication line b is connected between the relay control subcircuit 15 and the control circuit 30 and is configured to transmit control commands as digital signals.

[0040] Specifically, the first temperature sensor 14 is integrated into the relay control subcircuit 15. The relay circuit 11 is further connected to the relay control subcircuit 15 by a power line a and a communication line b, and the relay control subcircuit 15 is connected to the control circuit 30 via the power line a and communication line b. When the power battery is short-circuited, the control command transmitted by the control circuit 30 can control the relay control subcircuit 15 in the form of an electrical 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. For example, the communication line may be a CAN bus, and the transmitted control command may be a CAN command. By doing so, the control effect on the relay is improved, the reliability of the relay control is improved, and the safety of the power battery is further improved.

[0041] As selectable, Figure 4 is a schematic diagram of the structure of another power battery control system according to an embodiment of the present invention. Referring to Figure 4, the control circuit 30 includes a battery management circuit 31 and a vehicle-wide controller 32. The battery management circuit 31 is connected to a relay control subcircuit 15, a sampling circuit 20, and a fuse circuit 12, and the relay control subcircuit 15 is connected to the battery management circuit 31 via power line a. The battery management circuit 31 is configured to determine whether the power battery is short-circuited based on a first temperature and / or a second temperature and current, and to transmit a first control command to the relay 13 based on the determination result. The vehicle-wide controller 32 is connected to the relay control subcircuit 15, that is, the relay control subcircuit is connected to the vehicle-wide controller 32 via communication line b, and the vehicle-wide controller 32 is configured to transmit a second control command when the relay control subcircuit 15 has not responded 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 a vehicle-wide controller 32. The battery management circuit 31 is connected to a relay control sub-circuit 15, a sampling circuit 20, and a fuse circuit 12, and acquires a first temperature, a second temperature, and current to determine whether or not the power battery is short-circuited. If the power battery is short-circuited, it sends a first control command to control the relay control sub-circuit 15, and further controls it to disconnect the relay 13. If the battery management circuit 31 fails and cannot send the first control command, or if the relay control sub-circuit 15 does not respond to the first control command, the vehicle-wide controller 32, which is connected to the relay control sub-circuit 15, sends a second control command via a communication line to disconnect the relay 13. In this way, the reliability of the relay control is further improved, and the safety of the power battery is further enhanced.

[0043] As selectable, Figure 5 is a schematic diagram of the structure of a fuse circuit according to an embodiment of the present invention. Together, Figures 4 and 5 show that 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 blow 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, is provided in the casing of the fuse 17, and is configured to acquire the second temperature of the fuse 17.

[0044] Specifically, the fuse circuit 12 includes a fuse 17 and a second temperature sensor 16 provided in the casing of the fuse 17. The current from the bus L1 flows through the fuse 17, generating heat, and if the current of the power battery is greater than a first preset current threshold, the fuse 17 blows, protecting the power battery. The second temperature sensor 16 can acquire a second temperature of the fuse 17. The control circuit 30 acquires the second temperature from the second temperature sensor 16 and determines the short-circuit status of the power battery based on the second temperature and current. If the power battery short-circuits, the control circuit 30 protects the power battery by sending a control command to disconnect the relay 13. In this way, it is possible to determine whether or not the power battery will short-circuit based on the temperature of the fuse, prevent damage to the power battery due to short-circuit current caused by a delayed fuse blow, and further improve the safety of the power battery.

[0045] As can be selected, and continuing to refer to Figure 4, the sampling circuit 20 includes a sampler 21 and a third temperature sensor 22, the sampler 21 being connected between the switch circuit 10 and the bus L1 and connected to the control circuit 30, and configured to acquire the current from the power battery and modify the current based on the third temperature. The third temperature sensor 22 is connected to the sampler 21 and configured to acquire the third temperature of the sampler 21.

[0046] Specifically, the sampling circuit 20 includes a sampler 21 and a third temperature sensor 22. 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 acquire a third temperature of the heat generated when the current flows through the sampling circuit 20. Based on this third temperature, the sampler 21 can correct the sampled current, further improving the accuracy of the current and the accuracy with which the control circuit can determine whether or not the power battery is short-circuited.

[0047] As selectable, Figure 6 is a schematic diagram of the structure of a sampling circuit according to an embodiment of the present invention. Combining Figures 4 and 6, the sampler 21 includes a conductor 23 and a processor 24. The conductor 23 is connected between the switch circuit 10 and the bus L1, and a third temperature sensor 22 is provided on the surface of the conductor 23. The conductor 23 is configured to conduct current to measure the current of the power battery. The processor 24 is connected to the control circuit 30, provided on the surface of the conductor 23, and is configured to acquire the current of the conductor 23 and correct the current based on the third temperature. This further improves the accuracy of the acquired current and temperature.

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

[0049] As can be selected, and continuing to refer to Figure 6, the conductor portion 23 includes a first surface and a second surface. The third temperature sensor 22 is provided on the first surface of the conductor portion 23, and the processor 24 is provided on the second surface of the conductor portion 23, with the first surface being adjacent to the second surface.

[0050] Specifically, the conductor portion 23 includes a first surface and a second surface provided adjacent to each other, the third temperature sensor 22 is provided on the first surface, 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's determination of whether or not the power battery is short-circuited can be further improved.

[0051] The area of ​​the first surface may be optionally made smaller than the area of ​​the second surface. The small-volume third temperature sensor 22 can be placed on the small-area first surface, and the large-volume processor 24 can be placed on the large-area second surface, thereby reducing the volume of the sampling circuit, improving the integration density of the power battery control system, and reducing the volume of the power battery control system.

[0052] For example, while the power battery is operating, the first temperature sensor 14 acquires the first temperature of the relay 13 and outputs it to the relay control subcircuit 15. The second temperature sensor 16 acquires the second temperature of the fuse 17. The sampler 21 samples the current flowing through the bus L1 of the battery pack 40 and corrects the sampled current based on the third temperature acquired by the third temperature sensor 22. The battery management circuit 31 determines whether or not the power battery is short-circuited based on the acquired first temperature, second temperature and current.

[0053] A short-circuit failure in the power battery can be determined when the first temperature rapidly increases within a first preset time and / or the second temperature rapidly increases within a second preset time and exceeds a preset temperature threshold, the fuse 17 has not blown, and the current is greater than the second preset current threshold but less than the first preset current threshold. At this time, the battery management circuit 31 sends a first control command to the relay control sub-circuit 15 and controls the relay 13 to disconnect.

[0054] If the battery management circuit 31 fails and cannot send the first control command, or if the relay control sub-circuit 15 does not respond to the first control command, the vehicle-wide controller 32 connected to the relay control sub-circuit 15 sends a second control command via the communication line to control the relay 13 to disconnect. The power battery control system according to this embodiment improves the accuracy of detecting short-circuit failures in the power battery, enables timely handling of short-circuit failures, and improves the safety of the power battery.

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

[0056] Figure 8 is a flowchart of a power battery control method according to an embodiment of the present invention. The power battery includes a battery pack, a bus, and a control system, for example, the control system 100 in any of the embodiments or combinations thereof described above. Referring to Figure 8, the power battery control method according to an embodiment of the present invention includes the following steps.

[0057] S101 acquires the temperature of the switch circuit and the first current collected by the sampling circuit.

[0058] Specifically, the switch circuit of the power battery can control the operating state of the power battery circuit. When the switch circuit is disconnected, the power battery stops operating, and when the switch circuit is connected, the power battery operates. During the operation of the power battery, current flows through the switch circuit, generating heat. The operating state of the power battery can be determined by obtaining the temperature of the switch circuit and the first current of the power battery collected by the sampling circuit.

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

[0060] Operating states include normal operating states and overload states.

[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. If the temperature of the switch circuit exceeds the safety temperature threshold and the first current collected by the sampling circuit exceeds the safety current threshold, it can be determined that the power battery is in an overloaded 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: Based on the overload condition of the power battery, the operating parameters of the power battery are adjusted to control the power battery so that it operates in a normal operating state.

[0063] Specifically, when a power battery is overloaded, the internal current exceeds the safety current threshold, the temperature rises and exceeds the safety temperature threshold, and if the power battery continues to operate, a safety failure will occur. At this time, it is necessary to adjust the operating parameters of the power battery, for example by reducing the output, thereby decreasing the current output by the power battery, gradually lowering the temperature, and returning the power battery to a normal operating state. By doing so, the normal operation of the power battery is maintained and the safety of the power battery is improved.

[0064] For example, during operation, the power battery acquires the temperature of the switch circuit and a first current collected by the sampling circuit. If the temperature of the switch circuit exceeds the safe temperature threshold and the first current collected by the sampling circuit exceeds the 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, to decrease the current of the power battery, gradually lower the temperature, and return the power battery to a normal operating state.

[0065] The battery control method according to this 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. When the power battery is in an overload state, it controls the power battery to operate in a normal operating state by adjusting the operating parameters of the power battery. In this way, the normal operation of the power battery is maintained and the safety of the power battery is improved.

[0066] As selectable, Figure 9 is a flowchart of another power battery control method according to the present embodiment. Referring to Figure 9, the power battery control method according to the present embodiment includes the following steps.

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

[0068] Specifically, the switch circuit includes a relay and a fuse, and the relay is configured to control the interruption and conduction of the power battery circuit. The current from the power battery generates a first temperature when it flows 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, which will be described in detail in the above embodiment and will not be described further here.

[0071] Specifically, the fuse is configured to protect the power battery by blowing when the current of the power battery exceeds a preset threshold. For example, fuse 17 is configured to protect the power battery by blowing when the current of the power battery exceeds a first preset current threshold. The current of the power battery may generate a second temperature when it flows through the fuse, and this second temperature may be set to determine the operating state of the power battery.

[0072] S203, the first current collected by the sampling circuit is acquired.

[0073] Specifically, a conductive section is provided within the sampling circuit, and the sampling circuit can collect the voltage of the conductive section and calculate a first current during the operation of the power battery based on the known resistance of the conductive 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, based on temperature and first current, the operating state of the power battery is determined, the operating state includes normal operating state and overload state, and the temperature includes the first temperature of the relay and the second temperature of the fuse.

[0075] S103: Based on the overload condition of the power battery, the operating parameters of the power battery are adjusted to control the power battery so that it operates in a normal operating state.

[0076] As selectable, Figure 10 is a flowchart of another power battery control method according to the present embodiment. Referring to Figure 10, the power battery control method according to the present embodiment includes the following steps.

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

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

[0079] S203, the first current collected by the sampling circuit is acquired.

[0080] S301, the relay's first temperature within a first preset time is compared with a first preset threshold to obtain a first comparison result.

[0081] Specifically, during normal operation of the power battery, the relay's first temperature is below the first preset threshold. If the first temperature exceeds the first preset threshold, the power battery may be in an overloaded state.

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

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

[0084] Specifically, during normal operation of the power battery, the second temperature of the fuse is below the second preset threshold. If the second temperature exceeds the second preset threshold, the power battery may be in an overloaded state.

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

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

[0087] The first preset time may be the same as the second preset time, or it may be different from the second preset time, and the first preset threshold may be the same as the second preset threshold, or it may be different from the second preset threshold, and this is not limited to these.

[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 preset temperature threshold is higher than the first preset threshold, and the second preset temperature threshold is higher than the second preset threshold.

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

[0090] Specifically, during normal operation of the power battery, the first current of the power battery collected by the sampling circuit is below a third preset threshold. If the first current exceeds the third preset threshold, the power battery may be in an overloaded state. The operating state of the power battery can be determined by comparing the first current with the third preset threshold and based on the third comparison result. In some embodiments, the third preset threshold and the safety current threshold are the same.

[0091] S304, the operating state of the power battery is determined based on the first comparison result, the second comparison result, and the third comparison result.

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

[0093] S103: Based on the overload condition of the power battery, the operating parameters of the power battery are adjusted to control the power battery so that it operates in a normal operating state.

[0094] The preset current thresholds are configured to determine whether the power battery is in an overload state. The first preset current threshold and the second preset current threshold are configured to determine whether the power battery is in a short-circuit state.

[0095] In some embodiments, the preset current threshold, the safety 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 preset current threshold.

[0097] As selectable, Figure 11 is a flowchart of another power battery control method according to the embodiment of the present invention. Referring to Figure 11, the power battery control method according to the embodiment of the present invention includes the following steps.

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

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

[0100] S203, the first current collected by the sampling circuit is acquired.

[0101] S301, the relay's first temperature within a first preset time is compared with a first preset threshold to obtain a first comparison result.

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

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

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

[0105] Specifically, if the first temperature of the relay within a first preset time exceeds a first preset threshold and / or the second temperature of the fuse within a second preset time exceeds a second preset threshold, and the first current collected by the sampling circuit exceeds a third preset threshold, the power battery can be considered to be in an overload state, and its operating parameters need to be adjusted. By doing so, the operating state of the power battery can be determined based on multiple criteria, making timely processing easier and further improving the safety of the power battery.

[0106] S103: Based on the overload condition of the power battery, the operating parameters of the power battery are adjusted to control the power battery so that it operates in a normal operating state.

[0107] As selectable, Figure 12 is a flowchart of another power battery control method according to the embodiment of the present invention. Referring to Figure 12, the power battery control method according to the embodiment of the present invention includes the following steps.

[0108] S101 acquires the temperature of the switch circuit and the first current collected by the sampling circuit.

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

[0110] S501 controls the power battery to reduce its output when it is under overload.

[0111] Specifically, when a power battery is overloaded, the internal devices receive a current exceeding their capacity, causing their temperature to gradually rise. If this overload condition persists for an extended period, it can lead to a power battery safety failure. In this situation, reducing the power battery's output is necessary to decrease the internal current and protect the battery. This extends the battery's lifespan and saves costs.

[0112] As selectable, Figure 13 is a flowchart of another power battery control method according to the embodiment of the present invention. Referring to Figure 13, the power battery control method according to the embodiment of the present invention includes the following steps.

[0113] S101 acquires the temperature of the switch circuit and the first current collected by the sampling circuit.

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

[0115] S501 controls the power battery to reduce its output when it is under overload.

[0116] S601 acquires the second current collected by the 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 reacquired to confirm the current magnitude of the power battery.

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

[0119] Specifically, 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. Based on the comparison result, it is possible to determine whether or not the power battery's current has decreased, and thereby determine whether or not the power battery has failed.

[0120] Based on the S603, 4th comparison results, the failure status of the power battery is determined. Specifically, if the second current is smaller than the first current, it can be confirmed that the output of the power battery has decreased. If the second current is equal to or greater than the first current, and the output of the power battery has not decreased, it is necessary to check whether the power battery has failed and to take appropriate action for the power battery accordingly. By doing so, the safety of the power battery is further improved.

[0121] As selectable, Figure 14 is a flowchart of another power battery control method according to the embodiment of the present invention. Referring to Figure 14, the power battery control method according to the embodiment of the present invention includes the following steps.

[0122] S101 acquires the temperature of the switch circuit and the first current collected by the sampling circuit.

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

[0124] S501 controls the power battery to reduce its output when it is under overload.

[0125] S601 acquires the second current collected by the sampling circuit.

[0126] S602, the sampling circuit compares the second current and the first current within a third preset time period to obtain the 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 power battery reduces its output, then the current in the power battery decreases, indicating that the power battery is functioning normally. In this case, the power battery is not faulty.

[0129] S702, if the second current is greater than or equal to the first current, it is determined that a short-circuit failure has occurred in the power battery.

[0130] Specifically, when the second current was greater than or equal to the first current, the power battery performed an operation to reduce its output, but it was shown that the power battery's current did not actually decrease. At this time, it can be concluded that an external short-circuit failure occurred in the power battery. In other words, in addition to overload and normal operating conditions, the power battery also has a short-circuit condition.

[0131] As selectable, Figure 15 is a flowchart of another power battery control method according to the embodiment of the present invention. Referring to Figure 15, the power battery control method according to the embodiment of the present invention includes the following steps.

[0132] S101 acquires the temperature of the switch circuit and the first current collected by the sampling circuit.

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

[0134] S501 controls the power battery to reduce its output when it is under overload.

[0135] S601 acquires the second current collected by the sampling circuit.

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

[0137] Based on the S603, 4th comparison results, the failure status of the power battery is determined.

[0138] S801 controls the relay to disconnect in the event of a short-circuit failure in the power battery. Specifically, it is necessary to protect the power battery by disconnecting the relay and thus disconnecting the power battery circuit when a short-circuit failure occurs in the power battery. The relay can be controlled to disconnect by the battery management circuit, or it can be controlled to disconnect the relay by the vehicle-wide relay. By doing so, the power battery is further protected and safety is improved.

[0139] As selectable, Figure 16 is a flowchart of another power battery control method according to the embodiment of the present invention. Referring to Figure 16, the power battery control method according to the embodiment of the present invention includes the following steps.

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

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

[0142] S203, the first current collected by the sampling circuit is acquired.

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

[0144] Specifically, by acquiring the third temperature of the sampling circuit, the temperature of the power battery can be confirmed. The third temperature is the temperature generated when the current from the power battery flows through the conductor of the sampling circuit. The resistance of the conductor is affected by the temperature of the conductor, which in turn affects the magnitude of the current flowing through the conductor. 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 can be corrected based on the third temperature generated when the current from the power battery flows through the conductor of the sampling circuit, thereby further correcting the first current acquired by the sampling circuit. This ensures the accuracy of the sampled current. As described above, the first current can be corrected by the processor in the sampling circuit.

[0147] S102, based on temperature and first current, the operating state of the power battery is determined, the operating state includes normal operating state and overload state, and the temperature includes the first temperature of the relay and the second temperature of the fuse.

[0148] S103: Based on the overload condition of the power battery, the operating parameters of the power battery are adjusted to control the power battery so that it operates in a normal operating state.

[0149] For example, during operation, the power battery acquires the first temperature of the relay, the second temperature of the fuse, the third temperature of the sampling circuit, and the first current collected by the sampling circuit. The sampling circuit modifies the first current based on the third temperature. The first temperature of the relay within a first preset time is compared with a first preset threshold, the second temperature of the fuse within a second preset time is compared with a second preset threshold, and the first current sampled by the sampling circuit is compared with a third preset threshold.

[0150] The power battery can be considered to be in an overloaded state if 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. At this time, it is necessary to reduce the output of the power battery to decrease the current inside the power battery and thereby protect the power battery.

[0151] After a third preset time following the power battery's output reduction, the sampling circuit compares the second current with the first current. If the second current is greater than or equal to the first current, it indicates that the power battery attempted to reduce its output, but the actual power battery current did not decrease, resulting in a short-circuit failure in the power battery. At this point, the battery management system or the vehicle-wide relay controls the system to disconnect the relay, further protecting the power battery. This battery control method ensures the normal operation of the power battery and improves its safety.

[0152] As selectable, Figure 17 is a schematic diagram of the control circuit structure according to the present embodiment. Referring to Figure 17, the control circuit 30 according to the present embodiment is An acquisition module 171 is configured to acquire the temperature of the switch circuit and the first current collected by the sampling circuit, A determination module 172 is configured to determine the operating state of the power battery, including a normal operating state and an overload state, based on temperature and a first current. The system includes a control module 173 configured to control the power battery to operate in a normal operating state by adjusting the operating parameters of the power battery based on the overload state of the power battery.

[0153] The control circuit according to this embodiment acquires the temperature of the switch circuit and a first current collected by the sampling circuit. Based on the temperature and the first current, the operating state of the power battery, including a normal operating state and an overload state, is determined. Based on the operating state of the power battery, the operating parameters of the power battery are adjusted to control the power battery so that it operates in the normal operating state. By adjusting the operating parameters of the power battery based on the operating state of the power battery, the normal operation of the power battery is maintained, and the safety of the power battery is improved.

[0154] It should be understood that the steps can be rearranged, added, or deleted using the various forms of processes described above. For example, each step described herein may be performed in parallel, sequentially, or in a different order. This specification is not limited thereto if the desired results can be achieved with the technical proposal of this application. [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 sub-circuit: 15, Power line: a, communication line: b, Second temperature sensor: 16, Fuse: 17, Sampler: 21, Third temperature sensor: 22, Battery management circuit: 31, Vehicle overall controller: 32, Conductor part: 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, Decision module: 172, Adjustment module: 173.

Claims

1. A control system applied to a power battery, wherein the power battery includes a battery pack and a bus, and the control system is A switch circuit connected between the battery pack and the bus, configured to acquire and output its own temperature, A sampling circuit connected between the switch circuit and the bus, configured to sample the current of the battery pack, The circuit includes a control circuit connected to the switch circuit and the sampling circuit, configured to determine the state of the power battery based on the temperature of the switch circuit and the current of the battery pack, and to control the execution of a corresponding operation based on the state of the power battery, The state of the power battery includes a short-circuit state, an overload state, and a normal operating state. The operation corresponding to the short-circuit state is to control the switch circuit to disconnect it, and the operation corresponding to the overload state is to control and adjust the operating parameters of the power battery to bring it to the normal operating state. The sampling circuit samples the first current of the battery pack, The control circuit determines, based on the temperature of the switch circuit and the first current of the battery pack, that the current state of the power battery is the overload state, and controls and adjusts the operating parameters of the power battery to bring the power battery to the normal operating state. Within a third preset time after the control circuit has controlled and adjusted the operating parameters of the power battery, the sampling circuit samples the second current of the battery pack. The control circuit further acquires the second current and, in response to the second current being greater than or equal to the first current, determines that the current state of the power battery changes to the short-circuit state.

2. 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 the first temperature of the relay and / or the second temperature of the fuse. The control system according to claim 1, wherein the control circuit determines the 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.

3. The control system according to claim 2, 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 the current state of the power battery is an overload state.

4. The control system according to claim 2, 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 the current state of the power battery is a short circuit, and the first preset current threshold is greater than the second preset current threshold.

5. In response to the fact that the current of the battery pack is less than the first preset current threshold and greater than the second preset current threshold, and the temperature rise rate of the first temperature of the relay within the first preset time is 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 is greater than the second temperature rise rate threshold, the control circuit determines that the current state of the power battery is the short-circuit state, or 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 the first temperature threshold and / or the temperature value of the second temperature of the fuse exceeding the second temperature threshold, the control circuit determines that the current state of the power battery is the short-circuit state. The control system according to claim 4.

6. Adjusting the operating parameters of the aforementioned power battery is A control system according to any one of claims 1 to 5, comprising reducing the output of the power battery.

7. The switch circuit includes a relay, a first temperature sensor, and a relay control subcircuit, wherein the relay is connected between the battery pack and the bus, the first temperature sensor is connected to the relay and configured to acquire the first temperature of the relay, and the relay control subcircuit is connected to the first temperature sensor. The aforementioned control circuit is A battery management circuit is connected to the relay control subcircuit and is configured to transmit a first control command in response to the first temperature and the current of the battery pack, thereby controlling the relay control subcircuit to disconnect the relay in response to the first control command, and thereby controlling the switch circuit to disconnect; A control system according to any one of claims 1 to 5, comprising a whole-vehicle controller connected to the relay control subcircuit, which is configured to transmit a second control command when the first control command has not been transmitted 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, and thereby to disconnect the switch circuit.

8. The battery management circuit is connected to the relay control subcircuit via a power line to transmit the first control command. The vehicle-wide controller is connected to the relay control sub-circuit via a communication line to transmit the second control command. The control system according to claim 7, wherein the first temperature sensor is integrated into the relay control subcircuit.

9. The sampling circuit described above is A conductor portion connected between the switch circuit and the bus and configured to conduct current, A third temperature sensor is provided on the surface of the conductor portion and is configured to acquire the temperature of the conductor portion as the third temperature of the sampling circuit. A control system according to any one of claims 1 to 5, comprising a processor connected to the third temperature sensor and the control circuit, provided on the surface of the conductor portion, 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.

10. The surface of the conductor portion includes a first surface and a second surface. The control system according to claim 9, wherein 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.

11. The aforementioned switch circuit is A fuse connected between the battery pack and the bus, configured to blow when the current of the battery pack is greater than a first preset current threshold, The control system according to any one of claims 1 to 5, further comprising a second temperature sensor connected to the fuse and the control circuit, and provided in the casing of the fuse, and configured to acquire the second temperature of the fuse.

12. A power battery comprising a battery pack, a bus, and a control system according to any one of claims 1 to 5, connected between the battery pack and the bus.

13. A method for controlling a power battery, wherein the power battery includes a battery pack, a bus, and a control system according to any one of claims 1 to 5 connected between the battery pack and the bus, and the control method is The control circuit acquires the temperature of the switch circuit and the current of the battery pack sampled by the sampling circuit, A method for controlling a power battery, comprising: the control circuit determining the 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.

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