A method, system, device, and storage medium for low-temperature charging of electric vehicles.

Abstract

This invention discloses a method, system, device, and storage medium for low-temperature charging of electric vehicles, comprising: establishing a charging interaction connection between a battery management system and a target charging pile; determining that the temperature of the target battery is lower than a preset first threshold, requesting a first charging power from the target charging pile, so that the target charging pile and the target battery jointly supply power to the PTC heater and vehicle auxiliary equipment; gradually increasing the value of the first charging power; when the discharge current of the target battery is lower than a preset second threshold, disconnecting the charging and discharging circuit of the target battery, so that the target charging pile supplies power to the PTC heater and vehicle auxiliary equipment alone; when the temperature of the target battery rises to the first threshold, closing the charging and discharging circuit of the target battery, and requesting a second charging power from the target charging pile, so that the target charging pile supplies power to the target battery and vehicle auxiliary equipment. This invention improves the charging efficiency of electric vehicles and the user's charging experience when the battery is at low temperatures, and can be widely applied in the field of electric vehicle technology.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a method, system, device, and storage medium for low-temperature charging of electric vehicles. Background Technology

[0002] With the rapid development of the automotive industry, new energy vehicles are increasingly being chosen due to their environmental friendliness and low travel costs. Battery temperature is a key factor affecting the performance of new energy vehicle batteries. When the battery temperature is low, battery performance is poor, and charging speed decreases; when the battery temperature is too low, the battery cannot be charged. Battery temperature is usually detected by sensors inside the battery pack, indicating the actual current temperature of the battery. Even if the ambient temperature changes in a short period of time, the impact on the battery temperature is not significant. Relevant regulations prohibit charging when the vehicle battery temperature is below -20℃ because the battery's internal resistance is high at low temperatures, making it prone to lithium plating during charging, which can lead to internal short circuits and pose a risk of fire and explosion.

[0003] In existing technologies, the following methods are mostly used to overcome the problems of low-temperature charging of electric vehicles:

[0004] 1) The electric vehicle is "warmed up" using a method similar to that used in gasoline cars. After starting the electric vehicle, the battery discharges to power a PTC heater, which then heats the battery pack via a heating system, raising its temperature to a rechargeable level before charging begins. Since the battery discharge temperature requirement is relatively low, generally allowing discharge above -30°C, when the battery temperature is above -30°C but below -20°C, the battery can power the PTC heater, raising the battery temperature to a rechargeable level.

[0005] 2) Provides a physical insulation layer for the battery to prevent the battery temperature from dropping rapidly after the user uses the vehicle.

[0006] In the above methods, on the one hand, users need to warm up the car before plugging in the charging gun, which requires multiple operations and a long waiting time, affecting the charging efficiency of electric vehicles and the user's charging experience; on the other hand, even if the battery is physically insulated, if the vehicle is parked outdoors in cold weather for a long time, the battery temperature will still drop to a state where it cannot be charged, and the cumbersome process of warming up the car before charging cannot be avoided. Summary of the Invention

[0007] The purpose of this invention is to at least partially solve one of the technical problems existing in the prior art.

[0008] Therefore, one objective of this invention is to provide a low-temperature charging method for electric vehicles, which improves the charging efficiency of electric vehicles and the user's charging experience when the battery is at low temperatures.

[0009] Another objective of this invention is to provide a low-temperature charging system for electric vehicles.

[0010] To achieve the above-mentioned technical objectives, the technical solutions adopted in the embodiments of the present invention include:

[0011] In a first aspect, embodiments of the present invention provide a method for low-temperature charging of electric vehicles, comprising the following steps:

[0012] In response to the first interaction request initiated by the target charging pile, a charging interaction connection is established between the battery management system and the target charging pile;

[0013] Once the temperature of the target battery is determined to be below a preset first threshold, the battery management system requests a first charging power from the target charging pile, so that the target charging pile and the target battery jointly supply power to the PTC heater and vehicle auxiliary equipment.

[0014] The first charging power is gradually increased according to the preset first power curve. When the discharge current of the target battery is lower than the preset second threshold, the charging and discharging circuit of the target battery is disconnected, so that the target charging pile supplies power to the PTC heater and the vehicle auxiliary machine alone.

[0015] When the temperature of the target battery rises to the first threshold, the charging and discharging circuit of the target battery is closed, and the second charging power is requested from the target charging pile through the battery management system, so that the target charging pile supplies power to the target battery and the vehicle auxiliary equipment.

[0016] Furthermore, in one embodiment of the present invention, the step of establishing a charging interaction connection between the battery management system and the target charging pile in response to a first interaction request initiated by the target charging pile specifically includes:

[0017] The charging gun connects the vehicle to be charged to the target charging pile, and the battery management system receives the first interaction request initiated by the target charging gun.

[0018] Charging negotiation is performed based on the preset charging protocol and the first interaction request. When the negotiation is successful, a charging interaction connection is established between the battery management system and the target charging pile.

[0019] Furthermore, in one embodiment of the present invention, the step of determining that the temperature of the target battery is lower than a preset first threshold, and requesting a first charging power from the target charging pile through the battery management system, so that the target charging pile and the target battery jointly supply power to the PTC heater and the vehicle auxiliary equipment, specifically includes:

[0020] The battery management system monitors the current temperature and discharge power of the target battery in real time.

[0021] If the current temperature of the target battery is detected to be lower than a preset first threshold, the battery management system requests a first charging power from the target charging pile, so that the target charging pile and the target battery jointly supply power to the PTC heater and vehicle auxiliary equipment;

[0022] Wherein, the initial value of the first charging power is less than the current discharge power of the target battery.

[0023] Furthermore, in one embodiment of the present invention, the step of gradually increasing the value of the first charging power according to a preset first power curve, and disconnecting the charging and discharging circuit of the target battery when the discharge current of the target battery is lower than a preset second threshold, so that the target charging pile supplies power to the PTC heater and the vehicle auxiliary equipment alone, specifically includes:

[0024] A preset first power curve is obtained, and the value of the first charging power is gradually increased according to the first power curve. The current discharge current of the target battery is detected in real time by the battery management system.

[0025] When the discharge current of the target battery is lower than a preset second threshold, the high-voltage relay of the charging and discharging circuit of the target battery is disconnected by the battery management system.

[0026] The battery management system requests a third charging power from the target charging pile, enabling the target charging pile to supply power to the PTC heater and the vehicle auxiliary equipment separately.

[0027] The third charging power is equal to the sum of the first charging power and the discharge power of the target battery at the moment before the high-voltage relay is disconnected.

[0028] Furthermore, in one embodiment of the present invention, the step of closing the charging and discharging circuit of the target battery when the temperature of the target battery rises to the first threshold, and requesting a second charging power from the target charging pile through the battery management system, so that the target charging pile supplies power to the target battery and the vehicle auxiliary equipment, specifically includes:

[0029] If the current temperature of the target battery is detected to rise to the first threshold, the battery management system controls the high-voltage relay to close and controls the PTC heater to stop heating.

[0030] The battery management system obtains the rated charging power of the target battery and the power supply power of the vehicle auxiliary machine, determines the second charging power based on the rated charging power and the power supply power, and requests the second charging power from the target charging pile so that the target charging pile supplies power to the target battery and the vehicle auxiliary machine.

[0031] Wherein, the second charging power is equal to the sum of the rated charging power and the power supply power.

[0032] Furthermore, in one embodiment of the present invention, the low-temperature charging method for electric vehicles further includes the following steps:

[0033] The battery management system monitors the remaining power of the target battery in real time. When the remaining power of the target battery is detected to be greater than or equal to a preset third threshold, the charging and discharging circuit of the target battery is disconnected, and a charging completion message is sent to the target charging pile.

[0034] In a second aspect, embodiments of the present invention provide a low-temperature charging system for electric vehicles, comprising:

[0035] The charging interaction connection establishment module is used to establish a charging interaction connection between the battery management system and the target charging pile in response to the first interaction request initiated by the target charging pile.

[0036] The first power supply control module is used to determine that the temperature of the target battery is lower than a preset first threshold, and to request a first charging power from the target charging pile through the battery management system, so that the target charging pile and the target battery jointly supply power to the PTC heater and the vehicle auxiliary equipment;

[0037] The second power supply control module is used to gradually increase the value of the first charging power according to the preset first power curve. When the discharge current of the target battery is lower than the preset second threshold, the charging and discharging circuit of the target battery is disconnected, so that the target charging pile supplies power to the PTC heater and the vehicle auxiliary machine alone.

[0038] The third power supply control module is used to close the charging and discharging circuit of the target battery when the temperature of the target battery rises to the first threshold, and to request a second charging power from the target charging pile through the battery management system, so that the target charging pile supplies power to the target battery and the vehicle auxiliary equipment.

[0039] As an optional further implementation, the electric vehicle cryogenic charging system also includes:

[0040] The remaining power detection module is used to detect the remaining power of the target battery in real time through the battery management system. When the remaining power of the target battery is detected to be greater than or equal to a preset third threshold, the charging and discharging circuit of the target battery is disconnected and a charging completion message is sent to the target charging pile.

[0041] Thirdly, embodiments of the present invention provide a low-temperature charging device for electric vehicles, comprising:

[0042] At least one processor;

[0043] At least one memory for storing at least one program;

[0044] When the at least one program is executed by the at least one processor, the at least one processor implements the above-described method for low-temperature charging of an electric vehicle.

[0045] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing a processor-executable program, which, when executed by a processor, is used to perform the above-described method for low-temperature charging of an electric vehicle.

[0046] The advantages and beneficial effects of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention:

[0047] In response to a first interactive request initiated by a target charging pile, this embodiment of the invention establishes a charging interaction connection between the battery management system and the target charging pile. It determines that the temperature of the target battery is below a preset first threshold, and requests a first charging power from the target charging pile through the battery management system. This allows the target charging pile and the target battery to jointly supply power to the PTC heater and vehicle auxiliary equipment. Simultaneously, the first charging power is gradually increased according to a preset first power curve until the discharge current of the target battery is below a preset second threshold. The charging and discharging circuit of the target battery is then disconnected, allowing the target charging pile to supply power to the PTC heater and vehicle auxiliary equipment independently. When the temperature of the target battery rises to the first threshold, the charging and discharging circuit of the target battery is closed, and a second charging power is requested from the target charging pile through the battery management system, allowing the target charging pile to supply power to the target battery and vehicle auxiliary equipment. This invention provides power to the PTC heater and vehicle auxiliary equipment through a joint supply from the target charging pile and the target battery. The charging power of the target charging pile is gradually increased until the discharge current of the target battery drops below a preset value. Then, the charging and discharging circuit of the target battery is disconnected, allowing the target charging pile to warm up the vehicle independently. Finally, when the target battery temperature rises to a rechargeable state, the charging circuit of the target battery is closed, enabling the target charging pile to charge the target battery. This optimizes the charging process for electric vehicles at low battery temperatures. Users do not need to perform separate warm-up operations; they only need to insert the charging gun to begin automatic warm-up and charging, improving charging efficiency and user experience. No additional physical insulation design for the battery is required, reducing production costs. Furthermore, because the charging power of the target charging pile increases gradually, the discharge current of the target battery can be gradually reduced to a lower value, avoiding damage to the target battery caused by directly disconnecting the charging and discharging circuit, increasing battery life and charging safety. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments of the present invention are described below. It should be understood that the drawings described below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A flowchart illustrating the steps of a low-temperature charging method for electric vehicles provided in an embodiment of the present invention;

[0050] Figure 2 A structural block diagram of a low-temperature charging system for electric vehicles provided in an embodiment of the present invention;

[0051] Figure 3 This is a structural block diagram of a low-temperature charging device for electric vehicles provided in an embodiment of the present invention. Detailed Implementation

[0052] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The step numbers in the following embodiments are set only for ease of explanation, and there is no limitation on the order between the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0053] In the description of this invention, "multiple" means two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or the order of the indicated technical features. Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.

[0054] Reference Figure 1 This invention provides a method for low-temperature charging of electric vehicles, specifically including the following steps:

[0055] S101. In response to the first interaction request initiated by the target charging pile, establish a charging interaction connection between the battery management system and the target charging pile.

[0056] Specifically, when the electric vehicle's battery is at a low temperature, the user can directly establish a physical connection between the electric vehicle and the charging station via the charging gun. Simultaneously, the electric vehicle's Battery Management System (BMS) will establish a charging interaction connection with the charging station according to a preset charging protocol. Step S101 specifically includes the following steps:

[0057] S1011. Connect the vehicle to be charged to the target charging pile through the charging gun, and receive the first interaction request initiated by the target charging gun through the battery management system.

[0058] S1012. Based on the preset charging protocol and the first interaction request, perform charging negotiation. When the negotiation is successful, establish a charging interaction connection between the battery management system and the target charging pile.

[0059] Specifically, in this embodiment of the invention, the battery management system and the charging pile are established based on the current national standard GB / T27930 charging protocol. At this time, due to the power consumption of the vehicle auxiliary machine and the power supply demand of the PTC heater, the battery will be in a discharging state to supply power to the vehicle auxiliary machine and the PTC heater.

[0060] S102. Determine that the temperature of the target battery is lower than a preset first threshold, and request the first charging power from the target charging pile through the battery management system, so that the target charging pile and the target battery jointly supply power to the PTC heater and vehicle auxiliary equipment.

[0061] Specifically, when the battery management system detects that the target battery's temperature is below a first threshold (e.g., -20°C), it indicates that the target battery needs to be heated before charging. At this time, the battery management system can request a certain amount of charging power from the target charging station to power the PTC heater and vehicle auxiliary equipment together with the target battery. This reduces the energy consumption of the target battery during the warm-up phase, thereby improving charging efficiency. It also ensures that the PTC heater operates at its optimal state, reducing the warm-up time and further improving charging efficiency. Step S102 specifically includes the following steps:

[0062] S1021. Real-time monitoring of the target battery's current temperature and discharge power via the battery management system;

[0063] S1022. If the current temperature of the target battery is detected to be lower than a preset first threshold, the battery management system requests the first charging power from the target charging pile, so that the target charging pile and the target battery jointly supply power to the PTC heater and the vehicle auxiliary equipment.

[0064] The initial value of the first charging power is less than the current discharge power of the target battery.

[0065] Specifically, the initial value of the first charging power requested by the battery management system from the target charging station needs to be lower than the current discharge power of the target battery. This can avoid damage to the battery caused by a sudden drop in the discharge current of the target battery, thereby improving the battery's lifespan and charging safety.

[0066] S103. Gradually increase the value of the first charging power according to the preset first power curve. When the discharge current of the target battery is lower than the preset second threshold, disconnect the charging and discharging circuit of the target battery so that the target charging pile supplies power to the PTC heater and vehicle auxiliary equipment separately.

[0067] Specifically, this embodiment of the invention adopts a charging strategy of "battery powered alone - battery and charging pile powered together - charging pile powered alone". The first charging power is gradually increased, while the discharge power and discharge current of the target battery are gradually decreased. When the discharge current is lower than a second threshold (e.g., 5A), the charging and discharging circuit of the target battery can be safely disconnected, switching to a state where the target charging pile powers the battery alone. Step S103 specifically includes the following steps:

[0068] S1031. Obtain a preset first power curve, gradually increase the value of the first charging power according to the first power curve, and detect the current discharge current of the target battery in real time through the battery management system.

[0069] S1032. When the discharge current of the target battery is lower than the preset second threshold, the high-voltage relay of the charging and discharging circuit of the target battery is disconnected by the battery management system.

[0070] S1033. Request a third charging power from the target charging pile through the battery management system, so that the target charging pile can supply power to the PTC heater and vehicle auxiliary equipment separately.

[0071] The third charging power is equal to the sum of the first charging power and the discharge power of the target battery at the moment before the high-voltage relay is disconnected.

[0072] Specifically, the first power curve is a pre-designed curve showing how power changes over time. For example, the first charging power can be linearly increased by 0.1A per second with an initial value of 1A, or other growth curves (such as parabolic or hyperbolic curves) can be used, as long as the growth rate is controlled. This embodiment of the invention does not limit this.

[0073] When the initial charging power increases to a certain value, the PTC heater and vehicle auxiliary equipment gradually switch from being primarily powered by the target battery to being primarily powered by the target charging station, and the discharge current of the target battery gradually decreases. When the discharge current of the target battery is less than the second threshold (e.g., 5A) at which the charging and discharging circuit can be safely disconnected, the corresponding high-voltage relay can be disconnected (both the positive and negative high-voltage relays can be disconnected simultaneously, or only one of them can be disconnected). At the same time, a third charging power is requested from the target charging station, so that the power input from the target charging station cancels out the initial charging power and the discharge power of the target battery at the previous moment, which is the power actually required by the PTC heater and vehicle auxiliary equipment. At this time, the target battery hardly discharges from the PTC heater and vehicle auxiliary equipment, while the target charging station just powers the PTC heater and vehicle auxiliary equipment without charging the target battery.

[0074] S104. When the temperature of the target battery rises to the first threshold, the charging and discharging circuit of the target battery is closed, and the second charging power is requested from the target charging pile through the battery management system, so that the target charging pile supplies power to the target battery and vehicle auxiliary equipment.

[0075] Specifically, when the temperature of the target battery is detected to rise to the first rechargeable threshold (e.g., -20°C), the battery management system automatically controls the high-voltage relay to close and re-requests charging power from the target charging station. This allows the target battery and vehicle auxiliary equipment to be powered through the target charging station, achieving rapid charging of the target battery. Step S104 specifically includes the following steps:

[0076] S1041. If the current temperature of the target battery is detected to rise to the first threshold, the high-voltage relay is closed by the battery management system, and the PTC heater is stopped from heating.

[0077] S1042. Obtain the rated charging power of the target battery and the power supply power of the vehicle auxiliary machine through the battery management system, determine the second charging power based on the rated charging power and the power supply power, and request the second charging power from the target charging pile so that the target charging pile supplies power to the target battery and the vehicle auxiliary machine.

[0078] The second charging power is equal to the sum of the rated charging power and the power supply power.

[0079] Specifically, when the temperature of the target battery rises to the first threshold, the PTC heater can be controlled to stop heating, and the heat generated during battery charging is used to maintain the current temperature of the target battery. The battery management system requests a second charging power from the target charging pile based on the power required for battery charging (rated charging power) and the power required for vehicle auxiliary equipment, so as to achieve full load supply of the charging pile and thus realize fast charging of the battery.

[0080] As an optional implementation, the low-temperature charging method for electric vehicles further includes the following steps:

[0081] S105. The remaining power of the target battery is detected in real time through the battery management system. When the remaining power of the target battery is detected to be greater than or equal to the preset third threshold, the charging and discharging circuit of the target battery is disconnected and a charging completion message is sent to the target charging pile.

[0082] Specifically, during the charging process of the target battery, the battery management system monitors the remaining power of the target battery in real time. When the remaining power rises to a preset third threshold (such as 90% of the total battery capacity), the high-voltage relay of the target battery can be disconnected, and a message indicating that charging is complete can be sent to the target charging station. The charging process can be ended after the user unplugs the charging gun.

[0083] The method steps of the embodiments of the present invention have been described above. It can be understood that the embodiments of the present invention supply power to the PTC heater and vehicle auxiliary equipment through the joint supply of power from the target charging pile and the target battery, and gradually increase the charging power of the target charging pile until the discharge current of the target battery drops below a preset value. Then, the charging and discharging circuit of the target battery is disconnected, and the target charging pile warms up the vehicle independently. Finally, when the temperature of the target battery rises to a rechargeable state, the charging circuit of the target battery is closed, allowing the target charging pile to charge the target battery. This optimizes the charging process of electric vehicles when the battery is at low temperatures. Users do not need to perform separate warm-up operations; they only need to insert the charging gun to start automatic warm-up and automatic charging, improving charging efficiency and the user's charging experience. No additional physical insulation design for the battery is required, reducing production costs. Furthermore, because the charging power of the target charging pile gradually increases, the discharge current of the target battery can gradually decrease to a lower value, avoiding damage to the target battery caused by directly disconnecting the charging and discharging circuit, increasing battery life and charging safety.

[0084] Reference Figure 2 This invention provides a low-temperature charging system for electric vehicles, comprising:

[0085] The charging interaction connection establishment module is used to respond to the first interaction request initiated by the target charging pile and establish a charging interaction connection between the battery management system and the target charging pile.

[0086] The first power supply control module is used to determine that the temperature of the target battery is lower than a preset first threshold, and to request the first charging power from the target charging pile through the battery management system, so that the target charging pile and the target battery jointly supply power to the PTC heater and the vehicle auxiliary equipment.

[0087] The second power supply control module is used to gradually increase the value of the first charging power according to the preset first power curve. When the discharge current of the target battery is lower than the preset second threshold, the charging and discharging circuit of the target battery is disconnected, so that the target charging pile supplies power to the PTC heater and vehicle auxiliary equipment separately.

[0088] The third power supply control module is used to close the charging and discharging circuit of the target battery when the temperature of the target battery rises to the first threshold, and to request the second charging power from the target charging pile through the battery management system, so that the target charging pile can supply power to the target battery and vehicle auxiliary equipment.

[0089] As an optional implementation, the electric vehicle cryogenic charging system further includes:

[0090] The remaining power detection module is used to detect the remaining power of the target battery in real time through the battery management system. When the remaining power of the target battery is detected to be greater than or equal to a preset third threshold, the charging and discharging circuit of the target battery is disconnected and a charging completion message is sent to the target charging pile.

[0091] The content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0092] Reference Figure 3 This invention provides a low-temperature charging device for electric vehicles, comprising:

[0093] At least one processor;

[0094] At least one memory for storing at least one program;

[0095] When the above-mentioned at least one program is executed by the above-mentioned at least one processor, the above-mentioned at least one processor implements the above-mentioned method for low-temperature charging of electric vehicles.

[0096] The content of the above method embodiments is applicable to the device embodiments. The specific functions implemented by the device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0097] This invention also provides a computer-readable storage medium storing a processor-executable program that, when executed by a processor, performs the aforementioned method for low-temperature charging of an electric vehicle.

[0098] This invention provides a computer-readable storage medium that can execute a low-temperature charging method for electric vehicles provided in the method embodiments of this invention. It can execute any combination of the implementation steps of the method embodiments and has the corresponding functions and beneficial effects of the method.

[0099] This invention also discloses a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, causing the computer device to perform... Figure 1 The method shown.

[0100] In some alternative embodiments, the functions / operations mentioned in the block diagrams may not occur in the order shown in the operation diagrams. For example, depending on the functions / operations involved, two consecutively shown blocks may actually be executed substantially simultaneously, or the aforementioned blocks may sometimes be executed in reverse order. Furthermore, the embodiments presented and described in the flowcharts of this invention are provided by way of example to provide a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and sub-operations described as part of a larger operation are executed independently.

[0101] Furthermore, although the invention has been described in the context of functional modules, it should be understood that, unless otherwise stated, one or more of the aforementioned functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the invention. Rather, given the properties, functions, and internal relationships of the various functional modules in the apparatus disclosed herein, the actual implementation of the module will be understood within the scope of conventional skill of an engineer. Therefore, those skilled in the art can implement the invention as set forth in the claims using ordinary techniques without excessive experimentation. It is also understood that the specific concepts disclosed are merely illustrative and not intended to limit the scope of the invention, which is determined by the full scope of the appended claims and their equivalents.

[0102] 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 invention, or the part that contributes to the prior art, or a part 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 invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0103] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0104] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the aforementioned program can be printed, because the aforementioned program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or, if necessary, processing in other suitable ways, and then stored in computer memory.

[0105] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0106] In the foregoing description of this specification, references to terms such as "one embodiment," "another embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0107] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

[0108] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for low-temperature charging of electric vehicles, characterized in that, Includes the following steps: In response to the first interaction request initiated by the target charging pile, a charging interaction connection is established between the battery management system and the target charging pile; Once the temperature of the target battery is determined to be below a preset first threshold, the battery management system requests a first charging power from the target charging pile, so that the target charging pile and the target battery jointly supply power to the PTC heater and vehicle auxiliary equipment. The first charging power is gradually increased according to the preset first power curve. When the discharge current of the target battery is lower than the preset second threshold, the charging and discharging circuit of the target battery is disconnected, so that the target charging pile supplies power to the PTC heater and the vehicle auxiliary machine alone. When the temperature of the target battery rises to the first threshold, the charging and discharging circuit of the target battery is closed, and the second charging power is requested from the target charging pile through the battery management system, so that the target charging pile supplies power to the target battery and the vehicle auxiliary equipment; The step of gradually increasing the first charging power according to a preset first power curve, and disconnecting the charging and discharging circuit of the target battery when the discharge current of the target battery is lower than a preset second threshold, so that the target charging pile supplies power to the PTC heater and the vehicle auxiliary equipment alone, specifically includes: A preset first power curve is obtained, and the value of the first charging power is gradually increased according to the first power curve. The current discharge current of the target battery is detected in real time by the battery management system. When the discharge current of the target battery is lower than a preset second threshold, the high-voltage relay of the charging and discharging circuit of the target battery is disconnected by the battery management system. The battery management system requests a third charging power from the target charging pile, enabling the target charging pile to supply power to the PTC heater and the vehicle auxiliary equipment separately. Wherein, the third charging power is equal to the sum of the first charging power and the discharge power of the target battery at the moment before the high voltage relay is disconnected; The step of closing the charging and discharging circuit of the target battery when the temperature of the target battery rises to the first threshold, and requesting a second charging power from the target charging pile through the battery management system, so that the target charging pile supplies power to the target battery and the vehicle auxiliary equipment, specifically includes: If the current temperature of the target battery is detected to rise to the first threshold, the battery management system controls the high-voltage relay to close and controls the PTC heater to stop heating. The battery management system obtains the rated charging power of the target battery and the power supply power of the vehicle auxiliary machine, determines the second charging power based on the rated charging power and the power supply power, and requests the second charging power from the target charging pile so that the target charging pile supplies power to the target battery and the vehicle auxiliary machine. Wherein, the second charging power is equal to the sum of the rated charging power and the power supply power.

2. The method for low-temperature charging of an electric vehicle according to claim 1, characterized in that, The step of establishing a charging connection between the battery management system and the target charging pile in response to the first interaction request initiated by the target charging pile specifically includes: The charging gun connects the vehicle to be charged to the target charging pile, and the battery management system receives the first interaction request initiated by the target charging gun. Charging negotiation is performed based on the preset charging protocol and the first interaction request. When the negotiation is successful, a charging interaction connection is established between the battery management system and the target charging pile.

3. The method for low-temperature charging of an electric vehicle according to claim 1, characterized in that, The step of determining that the temperature of the target battery is lower than a preset first threshold, and requesting a first charging power from the target charging pile through the battery management system so that the target charging pile and the target battery jointly supply power to the PTC heater and vehicle auxiliary equipment, specifically includes: The battery management system monitors the current temperature and discharge power of the target battery in real time. If the current temperature of the target battery is detected to be lower than a preset first threshold, the battery management system requests a first charging power from the target charging pile, so that the target charging pile and the target battery jointly supply power to the PTC heater and vehicle auxiliary equipment; Wherein, the initial value of the first charging power is less than the current discharge power of the target battery.

4. A method for low-temperature charging of an electric vehicle according to any one of claims 1 to 3, characterized in that, The low-temperature charging method for electric vehicles also includes the following steps: The battery management system monitors the remaining power of the target battery in real time. When the remaining power of the target battery is detected to be greater than or equal to a preset third threshold, the charging and discharging circuit of the target battery is disconnected, and a charging completion message is sent to the target charging pile.

5. A low-temperature charging system for electric vehicles, characterized in that, A method for implementing a low-temperature charging method for an electric vehicle as described in any one of claims 1 to 4 includes: The charging interaction connection establishment module is used to establish a charging interaction connection between the battery management system and the target charging pile in response to the first interaction request initiated by the target charging pile. The first power supply control module is used to determine that the temperature of the target battery is lower than a preset first threshold, and to request a first charging power from the target charging pile through the battery management system, so that the target charging pile and the target battery jointly supply power to the PTC heater and the vehicle auxiliary equipment; The second power supply control module is used to gradually increase the value of the first charging power according to the preset first power curve. When the discharge current of the target battery is lower than the preset second threshold, the charging and discharging circuit of the target battery is disconnected, so that the target charging pile supplies power to the PTC heater and the vehicle auxiliary machine alone. The third power supply control module is used to close the charging and discharging circuit of the target battery when the temperature of the target battery rises to the first threshold, and to request a second charging power from the target charging pile through the battery management system, so that the target charging pile supplies power to the target battery and the vehicle auxiliary equipment.

6. The low-temperature charging system for electric vehicles according to claim 5, characterized in that, The electric vehicle cryogenic charging system also includes: The remaining power detection module is used to detect the remaining power of the target battery in real time through the battery management system. When the remaining power of the target battery is detected to be greater than or equal to a preset third threshold, the charging and discharging circuit of the target battery is disconnected and a charging completion message is sent to the target charging pile.

7. A low-temperature charging device for electric vehicles, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements a method for low-temperature charging of an electric vehicle as described in any one of claims 1 to 4.

8. A computer-readable storage medium storing a processor-executable program, characterized in that, The processor-executable program, when executed by the processor, is used to perform a cryogenic charging method for an electric vehicle as described in any one of claims 1 to 4.

Images