Battery heating system and vehicle

Abstract

The invention relates to a battery heating system and a vehicle, and relates to the technical field of vehicles, the system comprises a power battery pack, a first DCDC converter and a second DCDC converter, the power battery pack comprises a first battery pack and a second battery pack which are connected in series, and the first DCDC converter is connected with the first battery pack; the second DCDC converter is connected in series with the first DCDC converter, and the second DCDC converter is connected with the second battery pack; under the working condition of driving or parking, the first DCDC converter and the second DCDC converter can form a self-heating loop with the first battery pack and the second battery pack, the self-heating loop is used for heating the power battery pack, and under the condition that one of the first DCDC converter and the second DCDC converter is used for voltage reduction conversion, the self-heating loop is used for heating the power battery pack. And the other one is used for boost conversion. Therefore, the self-heating of the power battery pack can be realized under the working condition of driving or parking.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and particularly to a battery heating system and a vehicle. Background Art

[0002] For lithium-ion batteries, the charge and discharge performance will significantly decrease at low temperatures. When the temperature of the power battery is low, it is necessary to heat the power battery to improve its charge and discharge performance. Summary of the Invention

[0003] To overcome the problems existing in the related art, the present disclosure provides a battery heating system and a vehicle. By providing a first DCDC (Direct Current to Direct Current) converter and a second DCDC converter, a self-heating circuit can be formed with a first battery pack and a second battery pack connected in series, so that one of the DCDC converters can perform buck conversion and the other can perform boost conversion, thereby realizing charge and discharge pulses between the first battery pack and the second battery pack, so that the first battery pack and the second battery pack generate heat due to internal resistance, thus realizing self-heating of the power battery pack.

[0004] According to a first aspect of an embodiment of the present disclosure, a battery heating system is provided, including: A power battery pack, the power battery pack including a first battery pack and a second battery pack connected in series; A first DCDC converter, the first DCDC converter being connected to the first battery pack; A second DCDC converter, the second DCDC converter being connected to the first DCDC converter and the second DCDC converter being connected to the second battery pack; Under driving or parking conditions, the first DCDC converter and the second DCDC converter can form a self-heating circuit with the first battery pack and the second battery pack, and the self-heating circuit is used to heat the power battery pack, wherein when one of the first DCDC converter and the second DCDC converter is used for buck conversion, the other is used for boost conversion.

[0005] In this embodiment, by providing the first DCDC converter and the second DCDC converter, a self-heating circuit can be formed with the first battery pack and the second battery pack connected in series, so that step-down conversion can be performed by one of the DCDC converters and step-up conversion can be performed by the other DCDC converter, thereby realizing charge and discharge pulses between the first battery pack and the second battery pack, so that the first battery pack and the second battery pack generate heat due to internal resistance, thereby realizing self-heating of the power battery pack. Moreover, by providing the first DCDC converter and the second DCDC converter to realize charge and discharge pulses between the first battery pack and the second battery pack, it does not affect the power supply of the power battery pack to the drive system, and self-heating of the power battery pack can be realized both under driving or parking conditions.

[0006] In some possible embodiments, the self-heating circuit includes a first self-heating circuit and a second self-heating circuit; The first end of the first DCDC converter is connected to the positive electrode of the first battery pack, the first end of the second DCDC converter is connected to the second end of the first DCDC converter, and the second end of the second DCDC converter is connected to the negative electrode of the second battery pack to form the first self-heating circuit; The third end of the second DCDC converter is connected to the positive electrode of the second battery pack, the third end of the first DCDC converter is connected to the fourth end of the second DCDC converter, and the fourth end of the first DCDC converter is connected to the negative electrode of the first battery pack to form the second self-heating circuit.

[0007] In this embodiment, the entire self-heating circuit may include a first self-heating circuit and a second self-heating circuit. Among them, the first self-heating circuit leads out from the positive electrode of the first battery pack, passes through the first DCDC converter and the second DCDC converter, and finally returns to the negative electrode of the second battery pack, so as to charge the second battery pack through the first battery pack and realize self-heating of the battery pack. The second self-heating circuit leads out from the positive electrode of the second battery pack, passes through the second DCDC converter and the first DCDC converter, and finally returns to the negative electrode of the first battery pack, so as to charge the first battery pack through the second battery pack and realize self-heating of the battery pack. And the first charging circuit and the second charging circuit can achieve dynamic balance between the first battery pack and the second battery pack.

[0008] In some possible embodiments, the system further includes a controller configured to: periodically control the first self-heating circuit and the second self-heating circuit to conduct alternately to self-heat the power battery pack.

[0009] In this embodiment, by periodically controlling the first self-heating circuit and the second self-heating circuit to conduct alternately, a charge-discharge pulse between the first battery pack and the second battery pack is achieved, so that the first battery pack and the second battery pack generate heat due to internal resistance, thereby realizing the self-heating of the power battery pack, and the dynamic balance between the first battery pack and the second battery pack can be achieved.

[0010] In some possible embodiments, when the first self-heating circuit is conducting, the first DCDC converter draws power from the positive electrode of the first battery pack, performs a step-down conversion, and then transmits it to the second DCDC converter. The second DCDC converter performs a step-up conversion and then transmits it to the negative electrode of the second battery pack.

[0011] In this embodiment, for the first self-heating circuit, when the first self-heating circuit is conducting, the first DCDC converter draws power from the positive electrode of the first battery pack, performs a step-down conversion, and then transmits it to the second DCDC converter. The second DCDC converter performs a step-up conversion on the received low voltage and then transmits it to the negative electrode of the second battery pack, thereby realizing the charging of the second battery pack by the first battery pack and realizing the self-heating of the battery pack.

[0012] In some possible embodiments, when the second self-heating circuit is conducting, the second DCDC converter draws power from the positive electrode of the second battery pack, performs a step-down conversion, and then transmits it to the first DCDC converter. The first DCDC converter performs a step-up conversion and then transmits it to the negative electrode of the first battery pack.

[0013] In this embodiment, for the second self-heating circuit, when the second self-heating circuit is conducting, the second DCDC converter draws power from the positive electrode of the second battery pack, performs a step-down conversion, and then transmits it to the first DCDC converter. The first DCDC converter performs a step-up conversion on the received low voltage and then transmits it to the negative electrode of the first battery pack, thereby realizing the charging of the first battery pack by the second battery pack and realizing the self-heating of the battery pack.

[0014] In some possible embodiments, the system further includes a low-voltage power distribution module, and the low-voltage power distribution module is disposed between the first DCDC converter and the second DCDC converter; Under driving or parking conditions, the low-voltage power distribution module can form a low-voltage power supply loop with the first DCDC converter, the second DCDC converter, the first battery pack, and the second battery pack, and the low-voltage power supply loop is used to supply power to the low-voltage loads of the vehicle.

[0015] In this embodiment, a low-voltage power distribution module may also be provided. The low-voltage power distribution module can form a low-voltage power supply loop with the first DCDC converter, the second DCDC converter, the first battery pack, and the second battery pack. The low-voltage power distribution module can be connected to multiple low-voltage loads to supply power to the multiple low-voltage loads.

[0016] In some possible embodiments, the first end of the second DCDC converter is connected to the second end of the first DCDC converter through a positive wire, and the third end of the first DCDC converter is connected to the fourth end of the second DCDC converter through a negative wire; The positive terminal of the low-voltage power distribution module is connected to the positive wire, and the negative terminal of the low-voltage power distribution module is connected to the negative wire.

[0017] In this embodiment, based on the first self-heating loop and the second self-heating loop, the positive terminal of the low-voltage power distribution module is connected to the positive wire to enable the positive terminal of the first power distribution module to be respectively connected to the first end of the second DCDC converter and the second end of the first DCDC converter; the negative terminal of the low-voltage power distribution module is connected to the negative wire to enable the negative terminal of the first power distribution module to be respectively connected to the third end of the first DCDC converter and the fourth end of the second DCDC converter, so that when the first self-heating loop or the second self-heating loop is turned on, the low-voltage power distribution module can obtain the voltage after low-voltage conversion from the first DCDC converter or the second DCDC converter.

[0018] In some possible embodiments, the system further includes a controller, and the controller is configured to: Control the first DCDC converter to draw power from the positive pole of the first battery pack, perform step-down conversion and then transmit it to the second DCDC converter, control the second DCDC converter to perform step-up conversion and then transmit it to the negative pole of the second battery pack, and control the first DCDC converter to provide the voltage after step-down conversion to the low-voltage power distribution module.

[0019] In this embodiment, when the first self-heating loop is turned on, the first DCDC converter performs low-voltage conversion, and can provide the voltage after step-down conversion to the low-voltage power distribution module through the first DCDC converter, so that the low-voltage power distribution module can supply power to the low-voltage load.

[0020] In some possible embodiments, the system further includes a controller, and the controller is configured to: Control the second DCDC converter to draw power from the positive electrode of the second battery pack, perform a step-down conversion, and then transmit the power to the first DCDC converter. Control the first DCDC converter to perform a step-up conversion and then transmit the power to the negative electrode of the first battery pack. Control the second DCDC converter to provide the voltage after step-down conversion to the low-voltage power distribution module.

[0021] In this embodiment, when the second self-heating circuit is turned on, the second DCDC converter performs a low-voltage conversion, and the voltage after step-down conversion can be provided to the low-voltage power distribution module through the second DCDC converter, so that the low-voltage power distribution module can supply power to the low-voltage load.

[0022] According to a second aspect of the embodiments of the present disclosure, a vehicle is provided, including the battery heating system provided in the first aspect of the present disclosure.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. Description of the Drawings

[0024] The drawings here are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0025] Figure 1 is a schematic diagram of a battery heating system shown according to an exemplary embodiment.

[0026] Figure 2 is a block diagram of a vehicle shown according to an exemplary embodiment.

[0027] Figure 3 is a block diagram of another vehicle shown according to an exemplary embodiment. Detailed Embodiments

[0028] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. On the contrary, they are only examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0030] It should be noted that all actions of obtaining signals, information, or data in the present disclosure are carried out on the premise of complying with the corresponding data protection regulations and policies of the country where the location is located and obtaining the authorization given by the owner of the corresponding device.

[0031] For a lithium-ion battery, its charge and discharge performance will significantly decline at low temperatures. When the temperature of a power battery is low, it is necessary to heat the power battery to improve its charge and discharge performance.

[0032] In related technologies, the power battery pack can be heated by the thermal management heating components on the vehicle, or by the pulse heating function of the motor. When the vehicle is in the parked state and the motor is not driving, the motor can be used as an excitation source to pulse heat the battery pack. If the vehicle is not equipped with thermal management heating components or is in the driving state, it is impossible to heat the battery pack.

[0033] To solve the above technical problems, the embodiments of the present disclosure provide a battery heating system and a vehicle. By setting a first DCDC converter and a second DCDC converter, a self-heating circuit can be formed with a first battery pack and a second battery pack connected in series. One of the DCDC converters can perform buck conversion, and the other DCDC converter can perform boost conversion, so as to realize the charge and discharge pulses between the first battery pack and the second battery pack, so that the first battery pack and the second battery pack generate heat due to internal resistance, thereby realizing the self-heating of the power battery pack. Moreover, by setting the first DCDC converter and the second DCDC converter to realize the charge and discharge pulses between the first battery pack and the second battery pack, it does not affect the power supply of the power battery pack to the drive system, and the self-heating of the power battery pack can be realized both in the driving and parked conditions.

[0034] Figure 1 is a schematic diagram of a battery heating system shown according to an exemplary embodiment. As Figure 1 shown, the battery heating system may include: A power battery pack, which includes a first battery pack and a second battery pack connected in series. Among them, the voltages of the first battery pack and the second battery pack are equal, both can be 400V, so as to form a high-voltage power supply structure of 800V in series. In addition, the first battery pack and the second battery pack can also form a series-parallel structure, which can bypass the damaged area through the series-parallel structure between the first battery pack and the second battery pack to ensure continuous high-voltage output to the outside in the case of partial damage or abnormality of the battery.

[0035] A first DCDC converter, which is connected to the first battery pack to realize the current transmission between the first DCDC converter and the first battery pack.

[0036] A second DCDC converter, which is connected in series with the first DCDC converter and is connected to the second battery pack, so as to realize the current transmission between the first DCDC converter and the second DCDC converter, and the current transmission between the second DCDC converter and the second battery pack.

[0037] Under driving or parking conditions, the first DCDC converter and the second DCDC converter can form a self-heating circuit with the first battery pack and the second battery pack. The self-heating circuit is used to heat the power battery pack. Among them, when one of the first DCDC converter and the second DCDC converter is used for buck conversion, the other is used for boost conversion.

[0038] In this embodiment, by arranging the first DCDC converter and the second DCDC converter connected in series with each other, a self-heating circuit can be formed with the first battery pack and the second battery pack connected in series, so that one DCDC converter can perform buck conversion and the other DCDC converter can perform boost conversion, thereby realizing the charge and discharge pulses between the first battery pack and the second battery pack, so that the first battery pack and the second battery pack generate heat due to internal resistance, thereby realizing the self-heating of the power battery pack. Moreover, by arranging the first DCDC converter and the second DCDC converter to realize the charge and discharge pulses between the first battery pack and the second battery pack, it does not affect the power supply of the power battery pack to the drive system, and the self-heating of the power battery pack can be realized under both driving and parking conditions.

[0039] In some possible embodiments, the self-heating circuit may include a first self-heating circuit and a second self-heating circuit.

[0040] The first terminal of the first DCDC converter is connected to the positive electrode of the first battery pack, the first terminal of the second DCDC converter is connected to the second terminal of the first DCDC converter, and the second terminal of the second DCDC converter is connected to the negative electrode of the second battery pack to form a first self-heating circuit; the third terminal of the second DCDC converter is connected to the positive electrode of the second battery pack, the third terminal of the first DCDC converter is connected to the fourth terminal of the second DCDC converter, and the fourth terminal of the first DCDC converter is connected to the negative electrode of the first battery pack to form a second self-heating circuit.

[0041] In this embodiment, the entire self-heating circuit may include a first self-heating circuit and a second self-heating circuit. Among them, the first self-heating circuit is led out from the positive electrode of the first battery pack, passes through the first DCDC converter and the second DCDC converter, and finally returns to the negative electrode of the second battery pack, so as to charge the second battery pack through the first battery pack and achieve self-heating of the battery pack. That is, a 400V high-voltage current flows out from the positive electrode of the first battery pack, flows into the first DCDC converter through the first end of the first DCDC converter, and is subjected to low-voltage conversion or high-voltage conversion through the first DCDC converter to convert to a target voltage, which may be higher than the output voltage of the first battery pack or lower than the output voltage of the first battery pack. Then, the current after voltage conversion is output from the second end of the first DCDC converter and input into the second DCDC converter through the first end of the second DCDC converter, and is subjected to low-voltage conversion or high-voltage conversion through the second DCDC converter. Among them, if the previous one is low-voltage conversion, this is high-voltage conversion here; if the previous one is high-voltage conversion, this is low-voltage conversion here, and it is converted to the voltage of the second battery pack. Furthermore, the current after conversion voltage is output from the second end of the second DCDC converter and input into the negative electrode of the second battery pack.

[0042] The second self-heating circuit is led out from the positive electrode of the second battery pack, passes through the second DCDC converter and the first DCDC converter, and finally returns to the negative electrode of the first battery pack, so as to charge the first battery pack through the second battery pack and achieve self-heating of the battery pack. And the first charging circuit and the second charging circuit can achieve dynamic balance between the first battery pack and the second battery pack. That is, a 400V high-voltage current flows out from the positive electrode of the second battery pack, flows into the second DCDC converter through the third end of the second DCDC converter, and is subjected to low-voltage conversion or high-voltage conversion through the second DCDC converter to convert to a target voltage, which may be higher than the output voltage of the second battery pack or lower than the output voltage of the second battery pack. Then, the current after voltage conversion is output from the fourth end of the second DCDC converter and input into the first DCDC converter through the third end of the first DCDC converter, and is subjected to low-voltage conversion or high-voltage conversion through the first DCDC converter. Among them, if the previous one is low-voltage conversion, this is high-voltage conversion here; if the previous one is high-voltage conversion, this is low-voltage conversion here, and it is converted to the voltage of the first battery pack. Furthermore, the current after conversion voltage is output from the fourth end of the first DCDC converter and input into the negative electrode of the first battery pack.

[0043] In some possible embodiments, the system further includes a controller configured to: periodically control the first self-heating circuit and the second self-heating circuit to conduct alternately to self-heat the power battery pack.

[0044] In this embodiment, the first self-heating circuit and the second self-heating circuit are periodically controlled to be alternately turned on. That is, the first self-heating circuit is turned on, and after one cycle, the first self-heating circuit is turned off, the second self-heating circuit is turned on, and after one cycle, the second self-heating circuit is turned off again, and the first self-heating circuit is turned on again. Such repetition and alternation are performed to achieve charge and discharge pulses between the first battery pack and the second battery pack. So that the first battery pack and the second battery pack generate heat due to internal resistance, thereby realizing self-heating of the power battery pack, and being able to achieve dynamic balance between the first battery pack and the second battery pack.

[0045] In some possible embodiments, when the first self-heating circuit is turned on, the first DCDC converter takes power from the positive electrode of the first battery pack, performs step-down conversion, and then transmits it to the second DCDC converter. The second DCDC converter performs step-up conversion and then transmits it to the negative electrode of the second battery pack.

[0046] In this embodiment, the first self-heating circuit realizes charging of the second battery pack by the first battery pack through a method of first step-down and then step-up, thereby realizing self-heating of the battery pack. That is, a 400V high-voltage current flows out from the positive electrode of the first battery pack, flows into the first DCDC converter through the first end of the first DCDC converter, and is subjected to low-voltage conversion by the first DCDC converter to be converted into a target voltage, which is lower than the output voltage of the first battery pack. Then, the current after voltage conversion is output from the second end of the first DCDC converter, and is input into the second DCDC converter through the first end of the second DCDC converter. The second DCDC converter performs high-voltage conversion to be converted into the voltage of the second battery pack, and then the current after conversion voltage is output from the second end of the second DCDC converter and input into the negative electrode of the second battery pack.

[0047] In some possible embodiments, when the second self-heating circuit is turned on, the second DCDC converter takes power from the positive electrode of the second battery pack, performs step-down conversion, and then transmits it to the first DCDC converter. The first DCDC converter performs step-up conversion and then transmits it to the negative electrode of the first battery pack.

[0048] In this embodiment, the second self-heating circuit charges the first battery pack through the second battery pack by first stepping down the voltage and then stepping it up, realizing the self-heating of the battery pack. That is, a 400V high-voltage current flows out from the positive electrode of the second battery pack, flows into the second DCDC converter through the third terminal of the second DCDC converter, and is subjected to low-voltage conversion through the second DCDC converter to convert it into a target voltage, which is lower than the output voltage of the second battery pack. Then, the current after voltage conversion is output from the fourth terminal of the second DCDC converter, and is input into the first DCDC converter through the third terminal of the first DCDC converter. The first DCDC converter performs high-voltage conversion to convert it into the voltage of the first battery pack. Furthermore, the current after voltage conversion is output from the fourth terminal of the first DCDC converter and input into the negative electrode of the first battery pack.

[0049] In some possible embodiments, the system further includes a low-voltage power distribution module, which is arranged between the first DCDC converter and the second DCDC converter; Under driving or parking conditions, the low-voltage power distribution module can form a low-voltage power supply circuit with the first DCDC converter, the second DCDC converter, the first battery pack and the second battery pack, and the low-voltage power supply circuit is used to supply power to the low-voltage loads of the vehicle.

[0050] In this embodiment, a low-voltage power distribution module can also be provided. The low-voltage power distribution module can form a low-voltage power supply circuit with the first DCDC converter, the second DCDC converter, the first battery pack and the second battery pack. The low-voltage power distribution module can be connected to multiple low-voltage loads to supply power to multiple low-voltage loads. The low-voltage load can be any low-voltage load in the vehicle, such as a lighting system, an audio and entertainment system, an instrument panel and an auxiliary system, etc. Thus, the power supply pressure on the storage battery can be reduced, and low-voltage load power supply can also be carried out when the storage battery is out of power.

[0051] In some possible embodiments, the first terminal of the second DCDC converter is connected to the second terminal of the first DCDC converter through a positive wire, and the third terminal of the first DCDC converter is connected to the fourth terminal of the second DCDC converter through a negative wire; the positive terminal of the low-voltage power distribution module is connected to the positive wire, and the negative terminal of the low-voltage power distribution module is connected to the negative wire.

[0052] In this embodiment, based on the first self-heating circuit and the second self-heating circuit, the positive terminal of the low-voltage power distribution module is connected to the positive wire, so as to connect the positive terminal of the first power distribution module to the first end of the second DCDC converter and the second end of the first DCDC converter respectively; the negative terminal of the low-voltage power distribution module is connected to the negative wire, so as to connect the negative terminal of the first power distribution module to the third end of the first DCDC converter and the fourth end of the second DCDC converter respectively, so that when the first self-heating circuit or the second self-heating circuit is turned on, the low-voltage power distribution module can obtain the voltage after low-voltage conversion from the first DCDC converter or the second DCDC converter.

[0053] In some possible embodiments, the system further includes a controller, and the controller is configured to: Control the first DCDC converter to draw power from the positive electrode of the first battery pack, perform buck conversion and then transmit it to the second DCDC converter, control the second DCDC converter to perform boost conversion and then transmit it to the negative electrode of the second battery pack, and control the first DCDC converter to provide the voltage after buck conversion to the low-voltage power distribution module.

[0054] In this embodiment, when the first self-heating circuit is turned on, the first DCDC converter performs low-voltage conversion, and the voltage after buck conversion can be provided to the low-voltage power distribution module through the first DCDC converter, so as to supply power to the low-voltage load by the low-voltage power distribution module.

[0055] Optionally, in combination with the connection structure of the first heating circuit and the second heating circuit, and the connection structure of the low-voltage power distribution module, it is possible to control the first DCDC converter to draw power from the positive electrode of the first battery pack, perform buck conversion and then transmit it to the second DCDC converter, and control the second DCDC converter to perform boost conversion and then transmit it to the negative electrode of the second battery pack. And control the positive terminal of the low-voltage power distribution module to be conducted with the second end of the first DCDC converter through the positive wire, and control the negative terminal of the low-voltage power distribution module to be conducted with the fourth end of the second DCDC converter, so as to heat the power battery pack through the first self-heating circuit and provide the voltage after buck conversion to the low-voltage power distribution module.

[0056] In some possible embodiments, the system further includes a controller, and the controller is configured to: Control the second DCDC converter to draw power from the positive electrode of the second battery pack, perform buck conversion and then transmit it to the first DCDC converter, control the first DCDC converter to perform boost conversion and then transmit it to the negative electrode of the first battery pack, and control the second DCDC converter to provide the voltage after buck conversion to the low-voltage power distribution module.

[0057] In this embodiment, when the second self-heating circuit is turned on, the second DCDC converter performs a low-voltage conversion, and the voltage after the step-down conversion can be provided to the low-voltage power distribution module through the second DCDC converter, so that the low-voltage power distribution module supplies power to the low-voltage load.

[0058] Optionally, in combination with the connection structure of the first heating circuit and the second heating circuit, and the connection structure of the low-voltage power distribution module, control the second DCDC converter to draw power from the positive electrode of the second battery pack, perform a step-down conversion and then transmit it to the first DCDC converter, and control the first DCDC converter to perform a step-up conversion and then transmit it to the negative electrode of the first battery pack. And control the positive terminal of the low-voltage power distribution module to be turned on with the first terminal of the second DCDC converter, and control the negative terminal of the low-voltage power distribution module to be turned on with the third terminal of the first DCDC converter, so as to heat the power battery pack through the second self-heating circuit and provide the voltage after the step-down conversion to the low-voltage power distribution module.

[0059] Figure 2 is a block diagram of a vehicle shown according to an exemplary embodiment, as Figure 2 shown, in another exemplary embodiment, a vehicle is further provided, including the battery heating system in the above embodiment.

[0060] Figure 3 is a block diagram of another vehicle shown according to an exemplary embodiment. For example, the vehicle 300 can be a hybrid vehicle, or a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. The vehicle 300 can be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0061] Referring to Figure 3 , the vehicle 300 may include various subsystems. For example, an infotainment system 310, a perception system 320, a decision control system 330, a drive system 340, and a computing platform 350. Among them, the vehicle 300 may further include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 300 can be interconnected in a wired or wireless manner.

[0062] In some embodiments, the infotainment system 310 may include a communication system, an entertainment system, a navigation system, etc.

[0063] The perception system 320 may include several types of sensors for sensing information about the environment around the vehicle 300. For example, the perception system 320 may include a global positioning system (the global positioning system may be a GPS system, or a Beidou system, or other positioning systems), an inertial measurement unit (IMU), lidar, millimeter-wave radar, ultrasonic radar, and a camera device.

[0064] The decision-making and control system 330 may include a computing system, a vehicle controller, a steering system, an accelerator, and a braking system.

[0065] The drive system 340 may include components that provide powered movement for the vehicle 300. In one embodiment, the drive system 340 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, and an air compression engine. The engine is capable of converting the energy provided by the energy source into mechanical energy.

[0066] Some or all of the functions of the vehicle 300 are controlled by the computing platform 350. The computing platform 350 may include at least one processor 351 and a memory 352, and the processor 351 may execute instructions 353 stored in the memory 352.

[0067] The processor 351 may be any conventional processor, such as a commercially available CPU. The processor may also include, for example, a Graphic Process Unit (GPU), a Field Programmable Gate Array (FPGA), a System on Chip (SOC), an Application Specific Integrated Circuit (ASIC), or a combination thereof.

[0068] The memory 352 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disc.

[0069] In addition to the instructions 353, the memory 352 may also store data, such as road maps, route information, data on the position, direction, speed, etc. of the vehicle. The data stored in the memory 352 can be used by the computing platform 350.

[0070] In an embodiment of the present disclosure, the processor 351 may execute the instruction 353 to complete the control of the above-mentioned controller.

[0071] Those skilled in the art can also understand that the various illustrative logical blocks and steps listed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of the two. Whether such a function is implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art can use various methods to implement the described function for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present application.

[0072] In the above detailed description, terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", etc. Since the components of the described device can be positioned in multiple different orientations, the directional terms can be used for illustrative purposes and are not restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of the present disclosure. Therefore, the following detailed description should not be construed in a limiting sense.

[0073] It should be understood that unless otherwise specifically stated, the features of some embodiments of the present disclosure described herein can be combined with each other.

[0074] Although terms such as "first", "second", and "third" may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the various examples, the first component, part, region, layer, or section mentioned in the examples described herein can also be referred to as the second component, part, region, layer, or section. Additionally, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In the description herein, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and explicitly defined.

[0075] In addition, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as advantageous over other aspects or designs. Rather, the word exemplary is intended to present concepts in a concrete fashion. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to mean any of the natural inclusive permutations. That is, if X applies A; X applies B; or X applies both A and B, then "X applies A or B" is satisfied under any of the foregoing instances. Additionally, unless otherwise specified or clear from the context that it is referring to the singular form, the articles "a" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0076] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. Specifically with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if not structurally equivalent to the disclosed structure. Additionally, although a particular feature of the present disclosure may have been disclosed with respect to only one of several implementations, such a feature may, as may be desired and advantageous for any given or particular application, be combined with one or more other features of other implementations. Further, with respect to the use of "comprising", "having", "including", "with", or variants thereof in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term "including".

[0077] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

[0078] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the figures, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery heating system, characterized in that, Comprising: A power battery pack, the power battery pack including a first battery group and a second battery group connected in series; A first DCDC converter, the first DCDC converter being connected to the first battery group; A second DCDC converter, the second DCDC converter being connected in series with the first DCDC converter, and the second DCDC converter being connected to the second battery group; Under driving or parking conditions, the first DCDC converter and the second DCDC converter can form a self-heating circuit with the first battery group and the second battery group, and the self-heating circuit is used to heat the power battery pack. Among them, when one of the first DCDC converter and the second DCDC converter is used for buck conversion, the other is used for boost conversion.

2. The battery heating system according to claim 1, characterized in that The self-heating circuit includes a first self-heating circuit and a second self-heating circuit; A first end of the first DCDC converter is connected to the positive electrode of the first battery group, a first end of the second DCDC converter is connected to a second end of the first DCDC converter, and a second end of the second DCDC converter is connected to the negative electrode of the second battery group to form the first self-heating circuit; A third end of the second DCDC converter is connected to the positive electrode of the second battery group, a third end of the first DCDC converter is connected to a fourth end of the second DCDC converter, and a fourth end of the first DCDC converter is connected to the negative electrode of the first battery group to form the second self-heating circuit.

3. The battery heating system according to claim 1, characterized in that, The system further includes a controller, and the controller is configured to: periodically control the first self-heating circuit and the second self-heating circuit to conduct alternately to self-heat the power battery pack.

4. The battery heating system according to claim 3, wherein When the first self-heating circuit is conducting, the first DCDC converter draws power from the positive electrode of the first battery group, and after performing buck conversion, transmits it to the second DCDC converter, and the second DCDC converter performs boost conversion and then transmits it to the negative electrode of the second battery group.

5. The battery heating system according to claim 3, wherein When the second self-heating circuit is conducting, the second DCDC converter draws power from the positive electrode of the second battery group, and after performing buck conversion, transmits it to the first DCDC converter, and the first DCDC converter performs boost conversion and then transmits it to the negative electrode of the first battery group.

6. The battery heating system according to claim 2, wherein The system further includes a low-voltage power distribution module, and the low-voltage power distribution module is arranged between the first DCDC converter and the second DCDC converter; Under driving or parking conditions, the low-voltage power distribution module can form a low-voltage power supply circuit with the first DCDC converter, the second DCDC converter, the first battery group and the second battery group, and the low-voltage power supply circuit is used to supply power to the low-voltage loads of the vehicle.

7. The battery heating system according to claim 6, wherein The first terminal of the second DCDC converter is connected to the second terminal of the first DCDC converter through a positive line, and the third terminal of the first DCDC converter is connected to the fourth terminal of the second DCDC converter through a negative line; The positive terminal of the low-voltage power distribution module is connected to the positive line, and the negative terminal of the low-voltage power distribution module is connected to the negative line.

8. The battery heating system according to claim 6, wherein, The system further includes a controller, and the controller is configured to: Control the first DCDC converter to draw power from the positive electrode of the first battery pack, perform step-down conversion and then transmit it to the second DCDC converter, control the second DCDC converter to perform step-up conversion and then transmit it to the negative electrode of the second battery pack, and control the first DCDC converter to provide the voltage after step-down conversion to the low-voltage power distribution module.

9. The battery heating system according to claim 6, wherein, The system further includes a controller, and the controller is configured to: Control the second DCDC converter to draw power from the positive electrode of the second battery pack, perform step-down conversion and then transmit it to the first DCDC converter, control the first DCDC converter to perform step-up conversion and then transmit it to the negative electrode of the first battery pack, and control the second DCDC converter to provide the voltage after step-down conversion to the low-voltage power distribution module.

10. A vehicle, characterized in that, Comprising the battery heating system according to any one of claims 1 to 9.

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