Heating method and device for power battery of electric vehicle

Abstract

The application provides a heating method and device for a power battery of an electric vehicle. In the heating method for the power battery of the electric vehicle, the temperature of the power battery is obtained; when the temperature of the power battery is less than or equal to a preset low-temperature threshold, a vehicle-mounted charger OBC of the electric vehicle is controlled to output first heat, and the first heat is used for heating the power battery. The heating method for the power battery of the electric vehicle provided by the application reuses the OBC of the electric vehicle to heat the power battery, does not change the hardware structure, has low cost, and can improve the performance of the power battery in a low-temperature environment.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a heating method and apparatus for power batteries of electric vehicles. Background Technology

[0002] With the development of science and technology, new energy vehicles have gradually become widely used, and power batteries, as the core power source in new energy vehicles, are applied in different environments.

[0003] However, the performance of power batteries is significantly affected by temperature under different environments. Typically, in excessively low ambient temperatures, power batteries cannot function properly, greatly impacting the overall vehicle performance. For example, when a power battery is in a temperature environment of -20 degrees Celsius, its performance will be significantly reduced compared to normal temperatures.

[0004] Therefore, improving the performance of power batteries in low-temperature environments has become an urgent technical problem to be solved. Summary of the Invention

[0005] This application provides a heating method and apparatus for a power battery of an electric vehicle, which can improve the performance of the power battery in low-temperature environments.

[0006] In a first aspect, this application provides a method for heating a power battery of an electric vehicle, the method comprising: acquiring the temperature of the power battery; and when the temperature of the power battery is less than or equal to a preset low temperature threshold, controlling the on-board charger (OBC) of the electric vehicle to output a first heat, the first heat being used to heat the power battery.

[0007] In this regard, when the power battery is at a low temperature, the heat output from the electric vehicle's own OBC can be used to heat the power battery, which is low-cost and can improve the performance of the power battery in low-temperature environments.

[0008] In conjunction with the first aspect, in one possible implementation, the OBC includes a power factor correction (PFC) circuit; correspondingly, controlling the on-board charger (OBC) of the electric vehicle to output first heat includes: controlling the target battery in the electric vehicle to supply power to the PFC circuit so that the PFC circuit is in an operational state, wherein the first heat includes the heat output by the PFC circuit in an operational state.

[0009] In this implementation, the PFC circuit is controlled to output heat to heat the power battery. This is achieved by utilizing the internal circuitry of the OBC without changing the hardware structure, resulting in lower costs.

[0010] In conjunction with the first aspect, in one possible implementation, the OBC also includes a filter inductor; correspondingly, when the target battery in the electric vehicle supplies power to the PFC circuit, the filter inductor and the PFC circuit form a power loop.

[0011] In this implementation, when the PFC circuit is in operation, the filter inductor and the PFC circuit form a power loop and jointly generate heat to heat the power battery. This does not change the hardware structure and has a low cost.

[0012] In conjunction with the first aspect, in one possible implementation, the target battery includes the power battery.

[0013] In this implementation, the electric vehicle's power battery is used to power the PFC circuit. This method does not require changes to the circuit structure or the addition of an extra power supply, making it simple, convenient, and low-cost.

[0014] In conjunction with the first aspect, in one possible implementation, the water channels of the OBC and the power battery are connected, and the water channels of the OBC and the power battery are used to transfer the first heat to the power battery.

[0015] In this implementation, heat is transferred to the power battery using the water channels of the OBC and the power battery. The water channels of the OBC and the power battery are existing structures in electric vehicles. This method of heat transfer is simple and easy to implement.

[0016] In conjunction with the first aspect, in one possible implementation, the method further includes: controlling other devices in the electric vehicle to output a second heat source, the second heat source being used to heat the power battery.

[0017] In this implementation, other devices can also be used to output heat to heat the power battery, thereby improving the performance of the power battery in low-temperature environments.

[0018] In conjunction with the first aspect, in one possible implementation, controlling other devices in the electric vehicle to output second heat includes: when the power of the component in the OBC that outputs the first heat is less than or equal to the target power, controlling the other devices to output second heat, wherein the target power is capable of raising the power battery from the temperature to a preset high temperature threshold within a preset time period.

[0019] In this implementation, when the heat output from the OBC is insufficient, heat can be output through other devices to ensure that the power battery can be heated to a preset high temperature threshold, thereby improving the performance of the power battery in low temperature environments.

[0020] Secondly, this application provides a heating device for a power battery of an electric vehicle. The device includes: an acquisition module for acquiring the temperature of the power battery; and a control module for controlling the on-board charger (OBC) of the electric vehicle to output a first heat when the temperature of the power battery is less than or equal to a preset low temperature threshold, wherein the first heat is used to heat the power battery.

[0021] In conjunction with the second aspect, in one possible implementation, the OBC includes a power factor correction (PFC) circuit; correspondingly, the control module is specifically used to: control the target battery in the electric vehicle to supply power to the PFC circuit so that the PFC circuit is in an operational state, wherein the first heat includes the heat output by the PFC circuit in an operational state.

[0022] In conjunction with the second aspect, in one possible implementation, the OBC also includes a filter inductor; correspondingly, the control module is specifically configured to: when the target battery in the electric vehicle supplies power to the PFC circuit, the filter inductor and the PFC circuit form a power loop.

[0023] In conjunction with the second aspect, in one possible implementation, the target battery includes the power battery.

[0024] In conjunction with the second aspect, in one possible implementation, the water channels of the OBC and the power battery are connected, and the water channels of the OBC and the power battery are used to transfer the first heat to the power battery.

[0025] In conjunction with the second aspect, in one possible implementation, the control module is further configured to control other devices in the electric vehicle to output a second heat, which is used to heat the power battery.

[0026] In conjunction with the second aspect, in one possible implementation, the control module is specifically used to: control the other devices to output second heat when the power of the component that outputs the first heat in the OBC is less than or equal to the target power, wherein the target power is capable of raising the power battery from the temperature to a preset high temperature threshold within a preset time period.

[0027] Thirdly, this application provides a heating device for a power battery of an electric vehicle, the heating device including a processor coupled to a memory, the processor being configured to execute program code in the memory to implement the heating method as described in the first aspect or any of the possible implementations thereof.

[0028] Fourthly, this application provides an electric vehicle that includes a heating device as described in the second or third aspect.

[0029] Fifthly, this application provides a computer-readable storage medium storing a computer program or instructions that, when executed by a processor, implement the heating method as described in the first aspect or any of the possible implementations thereof.

[0030] Sixthly, this application provides a computer program product including computer program code, which, when run on a computer, causes the computer to implement the heating method as described in the first aspect or any of its possible implementations.

[0031] The electric vehicle power battery heating method provided in this application involves acquiring the power battery temperature and, when the power battery temperature is less than or equal to a preset low-temperature threshold, controlling the electric vehicle's on-board charger (OBC) to output first heat, which is used to heat the power battery. This heating method reuses the electric vehicle's own OBC to heat the power battery without changing the hardware structure, has low cost, and can improve the performance of the power battery in low-temperature environments. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating an application scenario provided in one embodiment of this application;

[0033] Figure 2 A schematic flowchart illustrating a heating method for a power battery of an electric vehicle according to an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of a single-phase OBC circuit topology provided in one embodiment of this application;

[0035] Figure 4 This is a schematic diagram of a three-phase OBC circuit topology provided in one embodiment of this application;

[0036] Figure 5 A schematic diagram of a heating device for a power battery of an electric vehicle provided in one embodiment of this application;

[0037] Figure 6 A schematic diagram of an apparatus provided for another embodiment of this application. Detailed Implementation

[0038] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0039] With the development of science and technology, new energy vehicles have been widely used. As the main energy storage device in new energy vehicles, the power battery is a key component of electric vehicles and directly affects their performance.

[0040] Figure 1 This is a schematic diagram illustrating an application scenario provided by one embodiment of this application. For example... Figure 1 As shown, the electric vehicle 100 includes an on-board charger 101, a power battery 102, and a charging port 103, which are connected to each other.

[0041] Normally, when the electric vehicle 100 is charging, the charging gun connected to the power grid is inserted into the charging port 103, and then the power battery 102 is charged through the conversion of the on-board charger 101; the electric vehicle 100 provides electrical energy through the power battery 102 during driving.

[0042] However, the performance of the power battery 102 is greatly affected by temperature under different environments. Usually, the power battery 102 cannot work properly when the ambient temperature is too low, which greatly affects the working status of the entire vehicle. For example, when the power battery 102 is in a low temperature environment of -20 degrees Celsius, its performance will be significantly reduced compared to that at normal temperature.

[0043] Therefore, improving the performance of power batteries in low-temperature environments has become an urgent technical problem to be solved.

[0044] In view of this, this application provides a heating method for the power battery of an electric vehicle to improve the performance of the power battery in a low-temperature environment.

[0045] The following is based on Figure 1 Taking the application scenario shown as an example, the technical solution of this application will be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0046] Figure 2 This is a schematic flowchart illustrating a heating method for a power battery of an electric vehicle according to one embodiment of this application. Figure 2 As shown, the method provided in this application embodiment includes S201 and S202. The following is a detailed description. Figure 2 The steps in the method shown.

[0047] S201, obtains the temperature of the power battery.

[0048] In this step, the electric vehicle's control system obtains the temperature of the power battery through a temperature sensor.

[0049] Optionally, the control system of an electric vehicle includes a vehicle control unit (VCU). The VCU is the central control unit of the electric vehicle and the core of the entire control system. Its main functions include coordinating and managing the operating status of the entire vehicle, such as collecting motor and battery status data and collecting sensor signals.

[0050] S202, when the temperature of the power battery is less than or equal to a preset low temperature threshold, the on-board charger (OBC) of the electric vehicle is controlled to output first heat, which is used to heat the power battery.

[0051] In this step, when the electric vehicle's control system detects that the temperature of the power battery is less than or equal to a preset low temperature threshold, it indicates that the performance of the power battery has been significantly reduced. Therefore, the system controls the on-board charger (OBC) of the electric vehicle to output the first heat to heat the power battery and improve its performance.

[0052] For example, the preset low temperature threshold can be set to -20 degrees Celsius. In a low temperature environment of -20 degrees Celsius, the performance of the power battery is reduced by 30% to 50% or even more than in a normal temperature environment.

[0053] Optionally, the OBC includes a power factor correction (PFC) circuit.

[0054] One possible way to control the first heat output of the OBC in an electric vehicle is to control the target battery in the electric vehicle to power the PFC circuit so that the PFC circuit is in an active state, and the first heat includes the heat output by the PFC circuit when it is in an active state.

[0055] Optionally, the target battery includes a power battery. Using the power battery in an electric vehicle to power the PFC circuit does not require changing the original circuit structure, is easy to implement, does not require adding additional power supply equipment, and has a low cost.

[0056] Alternatively, the target battery may also include batteries in electric vehicles or other energy storage devices, which can also power the PFC circuit.

[0057] Furthermore, when the target battery powers the PFC circuit, causing the PFC circuit to be in operation, each component in the PFC circuit will generate a certain amount of heat.

[0058] Optionally, the OBC also includes a filter inductor. When the target battery in the electric vehicle powers the PFC circuit, the filter inductor and the PFC circuit form a power loop, and the filter inductor also outputs a certain amount of heat to heat the power battery.

[0059] To put it simply, the middle part of the OBC has a water channel for cooling the OBC through water flow; the power battery also has a water channel for introducing liquids such as circulating fluid to absorb excess heat from the power battery during use, thus dissipating heat.

[0060] The OBC's water channel is connected to the power battery's water channel. The heat output from the PFC circuit and the filter inductor can be transferred to the power battery through the OBC's water channel and the power battery's water channel to heat the power battery. This method directly uses the original water channel structure in electric vehicles to transfer heat to the power battery, which is easy to implement.

[0061] Optionally, the OBC also includes a bidirectional DC-to-DC circuit, which is used to convert electrical energy of one voltage value into electrical energy of another voltage value in a DC circuit, that is, to transform one DC voltage into another DC voltage.

[0062] Optionally, the electric vehicle's control system can also control other devices in the electric vehicle to output a second heat source to heat the power battery.

[0063] One possible way to control the output of a second heat from other devices in an electric vehicle includes controlling other devices to output a second heat when the power of the component that outputs the first heat in the OBC is less than or equal to the target power, wherein the target power is capable of raising the power battery from the current temperature to a preset high temperature threshold within a preset time period.

[0064] In essence, when the initial heat output from the OBC is insufficient to raise the battery temperature from below a preset low-temperature threshold to a preset high-temperature threshold, other devices in the electric vehicle can be controlled to output a second heat source, allowing the battery temperature to rise to the preset high-temperature threshold. These other devices can be the existing heating control circuitry in the electric vehicle or external positive temperature coefficient (PTC) heating elements.

[0065] The electric vehicle power battery heating method in this embodiment reuses the electric vehicle's own OBC structure to heat the power battery, thereby improving the power battery's performance in low-temperature environments. It does not change the hardware structure and has a low cost. Moreover, this method is independent of the normal OBC charging and discharging function, making feature development easy and relatively stable. For OBCs that have already been manufactured, this function can also be upgraded and updated through over-the-air technology (OTA), which is easy to implement.

[0066] As an example, Figure 3This is a schematic diagram of a single-phase OBC circuit topology that can implement the above-described heating method according to an embodiment of this application.

[0067] like Figure 3 As shown, the power grid (V g The power battery is charged via the OBC (On-Board Charger). The OBC includes a filter inductor L. inv1 Filter inductor L inv2 Power switching transistors Q1, Q2, Q3, Q4, Q5, and Q6; capacitor C. dc The bidirectional DC-to-DC circuit and switching unit K1 are connected in parallel with bridge arm A, which is composed of power switch Q3 and power switch Q4, and bridge arm B, which is composed of power switch Q5 and power switch Q6.

[0068] Wherein, capacitor C dc Connected in parallel across the two ends of the bidirectional DC-to-DC circuit for filtering; power switches Q1, Q2, Q3, Q4, Q5 and Q6 constitute the PFC circuit, and power switches Q1 and Q2 constitute bridge arm N.

[0069] In the power grid (V g During the charging process of the power battery through the OBC, inside the OBC, switch K1 is closed, and the current flows sequentially through power switch Q1, bidirectional DC to DC circuit, power switch Q4, and filter inductor L. inv1 The first loop is formed, passing sequentially through power switch Q1, bidirectional DC-to-DC circuit, power switch Q6, and filter inductor L. inv2 A second loop is formed.

[0070] When the temperature of the power battery is less than or equal to the preset low temperature threshold, the OBC outputs the first heat, that is, the power battery supplies power to the OBC, so that the PFC circuit works under the inverter pure inductive load, and the bidirectional DC to DC circuit also works in the inverter state.

[0071] For example, assuming the input grid is 7 kW single-phase AC, a power loop is formed using two interleaved parallel bridge arms. For instance, bridge arms A and B form a single-phase inverter. That is, the electrical energy provided by the power battery passes through a bidirectional DC-to-DC circuit and then sequentially through the power switch Q3 and the filter inductor L. inv1 Filter inductor L inv2 Together with power switch Q6, they form the first power circuit, which passes through power switch Q5 and filter inductor L. inv2 Filter inductor L inv1Together with the power switch Q4, they form a second power circuit. The components in the first and second power circuits generate heat when they operate, and output heat. This heat is then transferred to the power battery through the water channels of the connected OBC and the power battery, thus heating the power battery.

[0072] Optionally, the power battery heating method implemented using a single-phase OBC circuit topology in this embodiment can also be combined with certain optimization strategies to maximize the power output of the OBC.

[0073] As another example Figure 4 This is a schematic diagram of a three-phase OBC circuit topology that can implement the above-described heating method according to an embodiment of this application.

[0074] like Figure 4 As shown, a three-phase power grid (V ga V gb V gc The power battery is charged via the OBC (On-Board Charger). The OBC includes a filter inductor L. inv1 Filter inductor L inv2 Filter inductor L inv3 Power switching transistors Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8; capacitor C. dc1 Capacitor C dc2 A bidirectional DC-to-DC circuit, switching units K1, K2, K3, K4 and K5, power switching transistors Q1 and Q2 form bridge arm A, power switching transistors Q3 and Q4 form bridge arm B, power switching transistors Q5 and Q6 form bridge arm C, and power switching transistors Q7 and Q8 form bridge arm N.

[0075] Among them, the capacitor C connected in series dc1 and capacitor C dc2 Connected in parallel across the two ends of the bidirectional DC-to-DC circuit for filtering; power switches Q1, Q2, Q3, Q4, Q5, Q6, Q7 and Q8 constitute the PFC circuit.

[0076] In a three-phase power grid (V ga V gb V gc During the charging process of the power battery through the OBC, inside the OBC, switch units K1, K2 and K3 are closed, and bridge arms A, B and C form a three-phase bridge arm.

[0077] When the temperature of the power battery is less than or equal to the preset low temperature threshold, the OBC outputs the first heat, that is, the power battery supplies power to the OBC, so that the PFC circuit works under the inverter pure inductive load, and the bidirectional DC to DC circuit also works in the inverter state.

[0078] For example, assuming the input power grid is 11 kW three-phase AC, the circuit structure can be selected as either a three-phase inverter or a single-phase inverter. When switching units K4 and K5 are closed, the circuit is in a three-phase inverter current closed-loop mode, such as when the A, B, and C bridge arms form a three-phase inverter. When only switching units K4 or K5 are closed, the circuit is in a single-phase inverter current closed-loop mode.

[0079] To understand, when only switch unit K4 or K5 is closed, the three bridge arms A, B, and N and the filter inductor L... inv1 Filter inductor L inv2 This forms an inverter circuit. At this time, the components in operation will generate heat and output heat. This heat will then be transferred to the power battery through the connected water channels of the OBC and the power battery, thus heating the power battery.

[0080] Optionally, when switch units K4 and K5 are closed, the three bridge arms A, B, and C and the filter inductor L... inv1 Filter inductor L inv2 Filter inductor L inv3 The components that form the inverter circuit and are in operation will generate heat and output heat. This heat will then be transferred to the power battery through the connected water channels of the OBC and the power battery, thus heating the power battery.

[0081] Optionally, the power battery heating method implemented using a three-phase OBC circuit topology in this embodiment can also be combined with certain optimization strategies to maximize the power output of the OBC.

[0082] The heating method implemented using single-phase or three-phase OBC circuit topology in the above embodiments is independent of the normal OBC charging and discharging function. Its characteristics are easy to develop, relatively stable, do not require changes to the hardware structure, have low cost, and can improve the performance of power batteries in low-temperature environments.

[0083] Based on the above embodiments, Figure 5 A heating device 500 for a power battery of an electric vehicle according to an embodiment of this application is shown. The device 500 includes an acquisition module 501 and a control module 502.

[0084] The acquisition module 501 is used to acquire the temperature of the power battery; the control module 502 is used to control the on-board charger (OBC) of the electric vehicle to output first heat when the temperature of the power battery is less than or equal to a preset low temperature threshold. The first heat is used to heat the power battery.

[0085] As an example, device 500 can be used to perform Figure 2 The method shown, for example, involves the acquisition module 601 executing S201 and the control module 502 executing S202.

[0086] In one possible implementation, the OBC includes a power factor correction (PFC) circuit; correspondingly, the control module is specifically used to: control the target battery in the electric vehicle to supply power to the PFC circuit so that the PFC circuit is in an operational state, wherein the first heat includes the heat output by the PFC circuit in an operational state.

[0087] In one possible implementation, the OBC also includes a filter inductor; correspondingly, the control module is specifically used to form a power loop with the PFC circuit when the target battery in the electric vehicle supplies power to the PFC circuit.

[0088] In one possible implementation, the target battery includes a power battery.

[0089] In one possible implementation, the water channels of the OBC and the power battery are connected, and the water channels of the OBC and the power battery are used to transfer the first heat to the power battery.

[0090] In one possible implementation, the control module is also used to control other devices in the electric vehicle to output a second heat, which is used to heat the power battery.

[0091] In one possible implementation, the control module is specifically used to: when the power of the component that outputs the first heat in the OBC is less than or equal to the target power, control other devices to output the second heat, and the target power can raise the temperature of the power battery from the preset temperature threshold within a preset time period.

[0092] It should be understood that the term "module" here can be implemented in software and / or hardware, without specific limitation. For example, a "module" can be a software program, hardware circuit, or a combination of both that implements the above-described functions. The hardware circuit may include application-specific integrated circuits (ASICs), electronic circuits, processors (e.g., shared processors, proprietary processors, or group processors) and memory for executing one or more software or firmware programs, integrated logic circuits, and / or other suitable components that support the described functions.

[0093] Figure 6 A schematic diagram of an apparatus provided for another embodiment of this application. Figure 6 The apparatus shown can be used to perform the methods in any of the foregoing embodiments.

[0094] like Figure 6 As shown, the device 600 in this embodiment includes a memory 601, a processor 602, a communication interface 603, and a bus 604. The memory 601, processor 602, and communication interface 603 are interconnected via the bus 604.

[0095] The memory 601 can be a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 601 can store programs, and when the program stored in the memory 601 is executed by the processor 602, the processor 602 uses it to execute... Figure 2 The steps of the method shown.

[0096] The processor 602 may be a general-purpose central processing unit (CPU), microprocessor, ASIC, or one or more integrated circuits, used to execute relevant programs to implement the methods in the embodiments of this application.

[0097] The processor 602 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the method in this embodiment can be accomplished through integrated logic circuits in the processor 602 or through software instructions.

[0098] The processor 602 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0099] The steps of the method disclosed in the embodiments of this application can be directly manifested as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 601. The processor 602 reads the information in memory 601 and, in conjunction with its hardware, completes the functions required by the units included in the heating device of this application. For example, it can execute... Figure 2 The various steps / functions of the illustrated embodiment.

[0100] The communication interface 603 can use, but is not limited to, transceivers to enable communication between the device 600 and other devices or communication networks.

[0101] Bus 604 may include a pathway for transmitting information between various components of device 600 (e.g., memory 601, processor 602, communication interface 603).

[0102] It should be understood that the device 600 shown in the embodiments of this application may be an electronic device, or it may be a chip configured in an electronic device.

[0103] It should be understood that the processor in the embodiments of this application can be a central processing unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0104] It should also be understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0105] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital versatile disc (DVD)), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0106] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0107] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0108] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0109] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0110] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0111] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0112] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0113] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0114] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0115] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for heating a power battery in an electric vehicle, characterized in that, A heating device for a power battery used in an electric vehicle, the device comprising: a power battery, an on-board charger (OBC) circuit, a first water channel, and a second water channel, wherein the first water channel is disposed in the OBC circuit, the second water channel is disposed in the power battery, the OBC circuit includes a power factor correction (PFC) circuit; the PFC circuit includes at least one power switching transistor, and the OBC circuit includes at least one filter inductor; The method includes: When the temperature of the power battery is less than or equal to a preset low temperature threshold, the power battery is controlled to supply power to the PFC circuit, so that the PFC circuit operates in the state of inverter pure inductive load; when the PFC circuit operates in the state of inverter pure inductive load, the power switch in the PFC circuit and the filter inductor form a target loop, so that the components in the target loop generate heat; the OBC circuit also includes a bidirectional DC-to-DC circuit, which operates in the inverter state when the power battery supplies power to the PFC circuit; The at least one power switch includes: a first power switch, a second power switch, a third power switch, a fourth power switch, a fifth power switch, and a sixth power switch, wherein the bridge arm formed by the third power switch and the fourth power switch is alternately connected in parallel with the bridge arm formed by the fifth power switch and the sixth power switch, and the at least one filter inductor includes a first filter inductor and a second filter inductor. The target circuit includes a first power circuit, wherein the electrical energy provided by the power battery passes through the bidirectional DC-to-DC circuit, and then sequentially passes through the third power switch, the first filter inductor, the second filter inductor, and the sixth power switch to form the first power circuit; and / or, The target circuit includes a second power circuit, wherein the electrical energy provided by the power battery passes through the bidirectional DC-to-DC circuit and then sequentially passes through the fifth power switch, the second filter inductor, the first filter inductor, and the fourth power switch to form the second power circuit; The first water channel is connected to the second water channel to transfer the heat generated by the PFC circuit under the inverter pure inductive load state to the power battery.

2. The method according to claim 1, characterized in that, The electric vehicle also includes other devices; The method further includes: When the power of the component that outputs heat in the OBC circuit is less than or equal to the target power, the other devices are controlled to output heat, wherein the target power is the power used to raise the temperature of the power battery to a preset high temperature threshold within a preset time period.

3. A method for heating the power battery of an electric vehicle, characterized in that, A heating device for a power battery used in an electric vehicle, the device comprising: a power battery, an on-board charger (OBC) circuit, a first water channel, and a second water channel, wherein the first water channel is disposed in the OBC circuit, the second water channel is disposed in the power battery, the OBC circuit includes a power factor correction (PFC) circuit; the PFC circuit includes at least one power switching transistor, and the OBC circuit includes at least one filter inductor; The method includes: When the temperature of the power battery is less than or equal to a preset low temperature threshold, the power battery is controlled to supply power to the PFC circuit so that the PFC circuit operates in the state of inverter pure inductive load. When the PFC circuit operates in the state of inverter pure inductive load, the power switch in the PFC circuit and the filter inductor form a target loop, so that the components in the target loop generate heat. The OBC circuit also includes a bidirectional DC-to-DC circuit. When the power battery supplies power to the PFC circuit, the bidirectional DC-to-DC circuit operates in the inverter state. The at least one power switch includes: a first power switch, a second power switch, a third power switch, a fourth power switch, a fifth power switch, a sixth power switch, a seventh power switch, and an eighth power switch. And, the at least one filter inductor includes a first filter inductor, a second filter inductor, and a third filter inductor; The OBC circuit also includes a first switching unit and a second switching unit; When only the first switching unit or only the second switching unit is closed, the bridge arm formed by the first and second power switches, the bridge arm formed by the third and fourth power switches, the bridge arm formed by the seventh and eighth power switches, the first filter inductor, and the second filter inductor constitute a first inverter circuit, wherein the target circuit includes the first inverter circuit; and / or, When the first switching unit and the second switching unit are closed, the bridge arm formed by the first power switch and the second power switch, the bridge arm formed by the third power switch and the fourth power switch, the bridge arm formed by the fifth power switch and the sixth power switch, the first filter inductor, the second filter inductor and the third filter inductor constitute the second inverter circuit, wherein the target circuit includes the second inverter circuit.

4. The method according to claim 3, characterized in that, The electric vehicle also includes other devices; The method further includes: When the power of the component that outputs heat in the OBC circuit is less than or equal to the target power, the other devices are controlled to output heat, wherein the target power is the power used to raise the temperature of the power battery to a preset high temperature threshold within a preset time period.

5. A heating device for a power battery of an electric vehicle, characterized in that, include: The system includes a power battery, an OBC circuit, a first water channel, and a second water channel. The first water channel is disposed in the OBC circuit, and the second water channel is disposed in the power battery. The OBC circuit includes a PFC circuit. The PFC circuit includes at least one power switching transistor, and the OBC circuit includes at least one filter inductor. When the temperature of the power battery is less than or equal to a preset low temperature threshold, the power battery supplies power to the PFC circuit, so that the PFC circuit operates in the state of an inverter-driven purely inductive load. When the PFC circuit operates in the state of an inverter-driven purely inductive load, the power switching transistor in the PFC circuit and the filter inductor form a target loop, so that the components in the target loop generate heat. The OBC circuit also includes a bidirectional DC-to-DC circuit, which operates in the inverter state when the power battery supplies power to the PFC circuit. The at least one power switch includes: a first power switch, a second power switch, a third power switch, a fourth power switch, a fifth power switch, and a sixth power switch, wherein the bridge arm formed by the third power switch and the fourth power switch is alternately connected in parallel with the bridge arm formed by the fifth power switch and the sixth power switch, and the at least one filter inductor includes a first filter inductor and a second filter inductor. The target circuit includes a first power circuit, wherein the electrical energy provided by the power battery passes through the bidirectional DC-to-DC circuit, and then sequentially passes through the third power switch, the first filter inductor, the second filter inductor, and the sixth power switch to form the first power circuit; and / or, The target circuit includes a second power circuit, wherein the electrical energy provided by the power battery passes through the bidirectional DC-to-DC circuit and then sequentially passes through the fifth power switch, the second filter inductor, the first filter inductor, and the fourth power switch to form the second power circuit; The first water channel is connected to the second water channel to transfer the heat generated by the PFC circuit under the inverter pure inductive load state to the power battery.

6. The apparatus according to claim 5, characterized in that, The heating device of the power battery of the electric vehicle is used to implement the heating method according to any one of claims 1 to 2.

7. A heating device for a power battery of an electric vehicle, characterized in that, include: The system includes a power battery, an OBC circuit, a first water channel, and a second water channel. The first water channel is disposed in the OBC circuit, and the second water channel is disposed in the power battery. The OBC circuit includes a PFC circuit. The PFC circuit includes at least one power switching transistor, and the OBC circuit includes at least one filter inductor. When the temperature of the power battery is less than or equal to a preset low temperature threshold, the power battery supplies power to the PFC circuit, so that the PFC circuit operates in the state of an inverter-driven purely inductive load. When the PFC circuit operates in the state of an inverter-driven purely inductive load, the power switching transistor in the PFC circuit and the filter inductor form a target loop, so that the components in the target loop generate heat. The OBC circuit also includes a bidirectional DC-to-DC circuit, which operates in the inverter state when the power battery supplies power to the PFC circuit. The at least one power switch includes: a first power switch, a second power switch, a third power switch, a fourth power switch, a fifth power switch, a sixth power switch, a seventh power switch, and an eighth power switch. And, the at least one filter inductor includes a first filter inductor, a second filter inductor, and a third filter inductor; The OBC circuit also includes a first switching unit and a second switching unit; When only the first switching unit or only the second switching unit is closed, the bridge arm formed by the first and second power switches, the bridge arm formed by the third and fourth power switches, the bridge arm formed by the seventh and eighth power switches, the first filter inductor, and the second filter inductor constitute a first inverter circuit, wherein the target circuit includes the first inverter circuit; and / or, When the first switching unit and the second switching unit are closed, the bridge arm formed by the first power switch and the second power switch, the bridge arm formed by the third power switch and the fourth power switch, the bridge arm formed by the fifth power switch and the sixth power switch, the first filter inductor, the second filter inductor and the third filter inductor constitute the second inverter circuit, wherein the target circuit includes the second inverter circuit; The first water channel is connected to the second water channel to transfer the heat generated by the PFC circuit under the inverter pure inductive load state to the power battery.

8. The apparatus according to claim 7, characterized in that, The heating device of the power battery of the electric vehicle is used to implement the heating method according to any one of claims 3 to 4.

9. A heating device for a power battery of an electric vehicle, characterized in that, It includes a processor coupled to a memory, the processor being configured to execute program code in the memory to implement the heating method as described in any one of claims 1 to 4.

10. An electric vehicle, characterized in that, Includes the heating device as described in any one of claims 5-9.

Images