Charging method and device based on electric vehicle and storage medium

Abstract

The embodiment of the invention relates to the technical field of battery charging, and discloses a charging method and device based on an electric vehicle and a storage medium, and the method comprises the steps that a magnetic integrated power supply, a power battery and a PTC heater are deployed in the electric vehicle, and a vehicle-mounted charger OBC is integrated in the magnetic integrated power supply; the method comprises the following steps: in response to an insertion operation of a charging gun, determining power information of the charging gun, and obtaining real-time temperature information of a power battery; if the real-time temperature information of the power battery is within a preset first temperature range, heating the power battery through the magnetic integrated power supply; and if the real-time temperature information of the power battery reaches a preset second temperature range, charging the power battery through the OBC according to the power information of the charging gun. Through comprehensive consideration of information of two dimensions of environment temperature and charging gun power, efficient charging of the electric vehicle is realized.

Description

Technical Field

[0001] This invention relates to the field of battery charging technology, specifically to a charging method, device, and storage medium for electric vehicles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the application of electric vehicles has covered various climate regions worldwide, including high-altitude and extremely cold regions. In cold regions, the charging function of electric vehicles is a core aspect of daily use, having a decisive impact on user travel convenience and vehicle practicality.

[0003] However, when the ambient temperature is extremely low, the electrolyte in the power battery freezes, and the battery's internal resistance becomes extremely high, affecting the AC charging of electric vehicles. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention provide a charging method, apparatus and storage medium for electric vehicles, which can improve the charging efficiency of electric vehicle batteries.

[0005] According to one aspect of the present invention, a charging method for an electric vehicle is provided, wherein the electric vehicle is equipped with a magnetic integrated power supply, a power battery, and a PTC heater, and the magnetic integrated power supply integrates an on-board charger (OBC); the method includes:

[0006] In response to the insertion of the charging gun, the power information of the charging gun is determined, and the real-time temperature information of the power battery is obtained.

[0007] If the real-time temperature information of the power battery is within a preset first temperature range, then the power battery is heated by the magnetic integrated power supply.

[0008] If the real-time temperature information of the power battery reaches the preset second temperature range, the power battery is charged through the OBC according to the power information of the charging gun; wherein, the numerical range of the preset first temperature range is smaller than the numerical range of the preset second temperature range.

[0009] According to another aspect of the present invention, a charging device for an electric vehicle is provided, wherein the electric vehicle is equipped with a magnetic integrated power supply, a power battery, and a PTC heater, and the magnetic integrated power supply integrates an on-board charger (OBC); the device includes:

[0010] The information determination module is used to respond to the insertion operation of the charging gun, determine the power information of the charging gun, and obtain the real-time temperature information of the power battery.

[0011] A battery heating module is used to heat the power battery via the magnetic integrated power supply if the real-time temperature information of the power battery is within a preset first temperature range.

[0012] A battery charging module is used to charge the power battery through the OBC according to the power information of the charging gun if the real-time temperature information of the power battery reaches a preset second temperature range; wherein the numerical range of the preset first temperature range is smaller than the numerical range of the preset second temperature range.

[0013] According to another aspect of the present invention, an electronic device is provided, including: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other through the communication bus;

[0014] The memory is used to store at least one executable instruction that causes the processor to perform operations as described in the embodiments of the present invention for the electric vehicle-based charging method.

[0015] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing at least one executable instruction, which, when executed on an electronic device, causes the electronic device to perform the operation of the electric vehicle-based charging method as described in the embodiments of the present invention.

[0016] According to another aspect of the present invention, a computer program product is provided, including a computer program that, when executed by a processor, implements a charging method based on an electric vehicle.

[0017] This invention provides a charging method, device, and storage medium for electric vehicles. The electric vehicle incorporates a magnetically integrated power supply and a power battery. The magnetically integrated power supply integrates an On-Board Charger (OBC), achieving high integration and functional reuse of the power system. By responding to the insertion of the charging gun, the power information of the charging gun can be determined, i.e., the power supply capacity of the external charging facility can be identified. Real-time temperature information of the current environment is acquired. Based on the real-time temperature information and the power information of the charging gun, different environmental conditions are dynamically adapted. In extremely low temperatures, the power battery is heated by the self-heating of the magnetically integrated power supply. Once the battery temperature rises to a certain range, the OBC is controlled to charge the power battery. By comprehensively considering real-time temperature information and charging gun power information, this invention can cope with different environments and external charging facilities, significantly improving the reliability and adaptability of AC charging under different environments and increasing battery charging efficiency.

[0018] The above description is merely an overview of the technical solutions of the embodiments of the present invention. In order to better understand the technical means of the embodiments of the present invention and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 A schematic flowchart of a charging method for electric vehicles provided by an embodiment of the present invention is shown;

[0021] Figure 2 A schematic diagram of the circuit structure of the magnetic integrated power supply provided in an embodiment of the present invention is shown;

[0022] Figure 3 A schematic flowchart of a charging method for electric vehicles provided by an embodiment of the present invention is shown;

[0023] Figure 4 A schematic flowchart of a charging method for electric vehicles provided by an embodiment of the present invention is shown;

[0024] Figure 5 A schematic diagram of a charging device based on an electric vehicle provided by an embodiment of the present invention is shown;

[0025] Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention is shown. Detailed Implementation

[0026] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein.

[0027] It should be noted that, in the embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other related elements in the method or apparatus that includes that element (e.g., steps in the method or modules in the apparatus; for example, a module may be a portion of circuitry, a portion of a processor, a portion of a program or software, etc.).

[0028] For example, the electric vehicle-based charging method provided in the embodiments of the present invention includes a series of steps, but the electric vehicle-based charging method provided in the embodiments of the present invention is not limited to the steps described herein. Similarly, the electric vehicle-based charging device provided in the embodiments of the present invention includes a series of modules, but the electric vehicle-based charging device provided in the embodiments of the present invention is not limited to the modules explicitly described, but may also include modules that need to be set up for obtaining relevant information or processing based on the information.

[0029] This invention provides a charging method, device, and storage medium for electric vehicles, which can be applied to electric vehicles.

[0030] It should be noted that the above-mentioned charging method based on electric vehicles can be implemented through the processor of the vehicle terminal. The processor can be at least one of the following: Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), Central Processing Unit (CPU), controller, microcontroller, and microprocessor.

[0031] In one embodiment, the electric vehicle as an on-board terminal may include an audio acquisition device, an audio output device, a video acquisition device, a video output device, a human-computer interaction device, and a processor as described above; for example, the human-computer interaction device may include a display screen capable of acquiring and recognizing touch operations, but this embodiment of the present invention does not limit this.

[0032] With the popularization of new energy electric vehicles, their adaptability to extreme climatic conditions has become a key challenge for technological development. In extremely cold regions, ambient temperatures can drop to -35°C or even lower, causing the electrolyte in electric vehicle power batteries to freeze, significantly increasing the battery's internal impedance and directly affecting its charging and discharging capabilities. Below -20°C, power batteries can typically only discharge and not charge, while below -35°C, the electrolyte completely solidifies, preventing the battery from both discharging and charging, thus preventing vehicles from replenishing energy through conventional AC charging. Furthermore, traditional AC charging modes, with low-power plugs, have limited AC charging power, making it difficult to meet the minimum power requirements for starting PTC (Positive Temperature Coefficient) heaters.

[0033] Currently, most methods involve using a Battery Management System (BMS) to control the On-Board Charger (OBC) and PTC heater to work together, attempting to initiate the heating process after the battery is pre-charged to high voltage. However, this is limited by the inability to pre-charge the battery at extremely low temperatures and insufficient AC charging power, leading to heating failure or low heating efficiency. Therefore, there is an urgent need for a heating method that can operate in extremely low-temperature environments without relying on battery pre-charging and is suitable for low-power AC charging, in order to ensure the charging reliability and efficiency of electric vehicles in extremely cold regions.

[0034] The present invention provides a charging method, device and storage medium for electric vehicles, which aims to solve the above-mentioned technical problems.

[0035] The technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0036] Figure 1 This diagram illustrates a flowchart of a charging method for electric vehicles according to an embodiment of the present invention. The method is executed by an electric vehicle-based charging device. This method can be applied to electric vehicles, which incorporate a magnetic integrated power supply, a power battery, and a PTC heater. The magnetic integrated power supply integrates an OBC (On-Board Charger). Figure 1 As shown, the method includes the following steps:

[0037] S101, responding to the insertion operation of the charging gun, determining the power information of the charging gun, and obtaining the real-time temperature information of the power battery.

[0038] For example, the magnetically integrated power supply is a high-density power conversion module with multiple ports and a common magnetic core. Its core structure includes a shared high-frequency transformer core on which at least three sets of functionally independent but magnetically coupled windings are wound. The first winding serves as the primary winding of the OBC CLLC resonant topology, the second winding serves as the secondary winding of the OBC CLLC topology, and the third winding serves as the secondary winding of the DCDC (DC converter). The OBC and DCDC are coordinated by a digital controller to schedule the on / off timing, switching frequency, and duty cycle of each winding, thereby achieving dynamic distribution and thermal management of energy flow among the AC input, the high-voltage power battery terminal, and the low-voltage 12V / 48V system. The OBC of the magnetically integrated power supply also has a PFC (Power Factor Correction) circuit inside. Figure 2 This is a schematic diagram of the circuit structure of a magnetic integrated power supply. Figure 2 In this context, the winding of the primary circuit of CLLC is the same as the primary winding of the OBC CLLC resonant topology, the winding of the secondary circuit of CLLC is the same as the secondary winding of the OBC CLLC topology, and the winding of the secondary circuit of DCDC is the same as the secondary winding of DCDC.

[0039] As the core component of the magnetic integrated power supply, the OBC supports multiple output modes such as constant voltage, constant current, and constant power.

[0040] The power battery is a lithium-ion battery pack, which has the ability to monitor cell voltage, temperature, insulation resistance, etc. in real time.

[0041] When the vehicle's battery is depleted, it can be charged using external charging facilities. For example, the charging gun from an external charging facility can be plugged into the vehicle's charging socket. The charging gun uses an AC charging connector that conforms to a preset standard. When the user plugs the charging gun into the vehicle's charging socket, the vehicle's CCU (Charging Control Unit) can monitor the electrical status of the CC (Control Confirmation) and CP (Control Pilot) contacts in real time to determine if a charging gun insertion operation has occurred. If the electrical status of the CC and CP contacts is in a preset state, a response to the charging gun insertion operation is initiated. For example, when the charging gun is inserted, the CC contact is connected to the detection circuit through a voltage divider resistor network, and the voltage change across it reflects whether the plug is in place and locked. The CP contact continuously outputs a PWM (Pulse Width Modulation) signal that conforms to the specified standard to characterize the maximum output capacity of the charging station.

[0042] If no response is received regarding the insertion of the charging gun, the monitoring of the insertion operation continues. If a response is received, the power information of the charging gun can be obtained. For example, by connecting to the charging gun, information such as the charging gun's identifier can be received. Based on the received identifier and other information, the corresponding power information of the charging gun can be found or calculated, thus obtaining the charging capacity of the charging gun.

[0043] It can also acquire the temperature of the power battery in real time as real-time temperature information. For example, the BMS collects temperature data and obtains real-time temperature information by using NTC (Negative Temperature Coefficient) thermistor sensors arranged in multiple key locations inside the battery pack (such as cell terminals, module bottom, and liquid cooling plate inlet and outlet).

[0044] In this embodiment, in response to the insertion operation of the charging gun, the power information of the charging gun is determined, including: in response to the insertion operation of the charging gun, acquiring the resistance signal of the connection confirmation CC contact, and acquiring the pulse width modulation (PWM) signal and AC voltage signal of the control guide CP contact; and determining the power information of the charging gun based on the resistance signal, the PWM signal, and the AC voltage signal.

[0045] Specifically, the CC contact is located in the low-voltage auxiliary circuit between the charging gun and the vehicle socket. By detecting the resistance of the CC contact, the type and capability of the charging device can be identified. For example, when the CC contact detects a resistance of 1.5kΩ, it corresponds to a portable charging cable with a rated current of 10A; when the CC contact detects a resistance of 2.7kΩ, it corresponds to a portable charging cable with a rated current of 16A; and when the CC contact detects an open circuit, it is determined to be a fixed charging station. The resistance signal of the CC contact can be sampled in real time through the ADC (Analog-to-Digital Converter) channel of the vehicle BMS or charging management controller. That is, after responding to the insertion operation of the charging gun, the resistance signal of the CC contact can be acquired in real time or periodically.

[0046] The CP contact is another key low-voltage communication contact. Upon receiving the charging gun insertion, the PWM signal and AC voltage of the CP contact can be acquired. The PWM signal can be precisely measured for its period and duty cycle by the vehicle's MCU (Microcontroller Unit) using a high-speed comparator or a dedicated CP signal decoding module. The AC voltage signal refers to the measured effective AC voltage between the L / N (Line / Neutral) wires at the charging gun input, which can be acquired using an isolated voltage sensor.

[0047] Resistance signal, PWM signal, and AC voltage signal are all used to determine power. In this embodiment, the calculation formula for power information is not specifically limited. For example, to determine the power information of the charging gun based on the resistance signal, PWM signal, and AC voltage signal, a multi-source signal fusion analysis algorithm can be executed. First, the connection type is initially determined based on the resistance signal of the CC contact. Then, the maximum output current allowed by the charging pile is locked by combining the duty cycle of the CP contact. The current LN AC voltage is read synchronously, and finally, the theoretical usable power is calculated.

[0048] The advantage of this setup is that by combining multiple signals, it enables power identification of the charging gun, avoiding PTC mis-activation or refusal to activate due to misjudgment of a single signal, and improving battery charging efficiency.

[0049] S120: Based on real-time temperature information and charging gun power information, control the OBC to charge the power battery.

[0050] For example, different control strategies can be preset, each representing the method by which the OBC charges the power battery. The control strategy matching the current environment can be determined based on real-time temperature information and the charging gun's power information, thereby controlling the OBC to charge the power battery according to that strategy.

[0051] For example, temperature and power ranges are pre-defined, and different temperature and power ranges can be coupled with different control strategies. The system determines the temperature range where the real-time temperature information falls and the power range where the charging gun's power information falls, and then determines the control strategy associated with that temperature and power range. Based on this control strategy, the OBC (On-Board Charger) is controlled to charge the power battery. For example, the OBC can be controlled to switch between different charging modes.

[0052] In other words, the control action of the OBC to charge the power battery is not a single fixed process, but can be dynamically scheduled according to the actual environment, such as the OBC's working mode and the on / off sequence of the high-voltage relay. For example, the control strategy can be: when the real-time temperature information is ≥ −10℃ and the charging gun's power information is ≥ 2.2kW, the OBC can be controlled to drive the PTC in constant voltage mode, with the PTC acting as the power battery's battery. When the power battery's temperature reaches the standard, the OBC is controlled to charge in constant current mode. When the real-time temperature information is ≥ −10℃ but the charging gun's power information is < 2.2kW, the power battery auxiliary start-up mechanism is activated. After successful pre-charging and high voltage establishment, the power battery's high-voltage relay is not disconnected. The power battery provides a peak current instantaneously to assist the PTC in crossing the start-up threshold. After the PTC stabilizes, the power battery relay is disconnected, and the OBC maintains low-power heating. In this embodiment, the preset control strategy is not specifically limited.

[0053] In this embodiment, two temperature ranges are pre-defined: a second temperature range and a first temperature range. Both the second and first temperature ranges are low-temperature ranges, with the second temperature range being higher than the first temperature range; that is, the first temperature range is an extremely low-temperature range. If the real-time temperature information of the power battery is within the preset first temperature range, the power battery is heated via a magnetic integrated power supply. If the real-time temperature information of the power battery reaches the preset second temperature range, the power battery is charged via an OBC (On-Board Charger) based on the power information of the charging gun. Specifically, S102 can include S1021 and S1022: S1021 heats the power battery via a magnetic integrated power supply if the real-time temperature information of the power battery is within the preset first temperature range; S1022 charges the power battery via an OBC based on the power information of the charging gun if the real-time temperature information of the power battery reaches the preset second temperature range.

[0054] This invention provides a charging method for electric vehicles. The electric vehicle is equipped with a magnetically integrated power supply and a power battery. The magnetically integrated power supply incorporates an on-board charger (OBC), achieving a high degree of integration and functional reuse of the power system. By responding to the insertion of the charging gun, the power information of the charging gun can be determined, i.e., the power supply capability of the external charging facility can be identified. Real-time temperature information of the current environment is acquired. Based on the real-time temperature information and the power information of the charging gun, different environmental conditions are dynamically adapted, thereby controlling the OBC to charge the power battery. By comprehensively considering real-time temperature information and charging gun power information, this invention can cope with different environments and external charging facilities, significantly improving the reliability and adaptability of AC charging under different environments and increasing battery charging efficiency.

[0055] Figure 3 This is a schematic flowchart of a charging method for electric vehicles provided in an embodiment of the present invention. This embodiment is an optional embodiment based on the above embodiment.

[0056] In this embodiment, a PTC heater is deployed in the electric vehicle; the OBC is controlled to charge the power battery according to the real-time temperature information and the power information of the charging gun, including: starting the PTC heater to heat the power battery according to the real-time temperature information and the power information of the charging gun; if it is determined that the real-time temperature information meets the preset charging conditions, the power battery is charged through the OBC.

[0057] like Figure 3 As shown, the method includes the following steps:

[0058] S301: In response to the insertion of the charging gun, determine the power information of the charging gun and obtain the real-time temperature information of the power battery.

[0059] S302. Based on real-time temperature information and charging gun power information, activate the PTC heater to heat the power battery.

[0060] For example, a PTC heater is an electrothermal element with self-limiting temperature characteristics, enabling safe heating without temperature control devices. The PTC heater can be positioned at the bottom of the power battery module or inside the liquid cooling plate channel, and is tightly bonded to the cell casing using thermally conductive silicone grease to ensure low thermal resistance in the heat conduction path. Structurally, the PTC heater can be integrated into a heating film, heating element, or embedded heating rod inside the battery pack, or it can be placed in a high-voltage circuit as a series heating load. In this embodiment, any PTC heater that possesses characteristics of rapid response at low temperatures, controllable start / stop, and uniform heat distribution falls within the protection scope of this embodiment.

[0061] The power information of the charging gun can be used to determine whether it has the ability to independently drive the PTC. For example, if the power information of the charging gun P≥2.2kW, it is considered "sufficient power"; otherwise, it is considered "insufficient power".

[0062] Based on real-time temperature and charging gun power information, a corresponding control strategy can be determined, and the PTC heater can be activated to heat the power battery according to the control strategy. For example, PTC activation conditions can be preset. It can be determined whether the real-time temperature and charging gun power information meet the preset activation conditions. If so, the PTC heater is activated to heat the power battery; if not, the real-time temperature information can be adjusted by the self-heating of the magnetic integrated power supply. When the real-time temperature reaches a certain standard, the PTC heater is activated again.

[0063] Based on real-time temperature information and charging gun power information, the PTC heater is activated to heat the power battery, including: if the real-time temperature information of the power battery is within a preset first temperature range, the power battery is heated through the magnetic integrated power supply; if the real-time temperature information of the power battery reaches a preset second temperature range, the power battery is charged through the OBC according to the charging gun power information.

[0064] In this embodiment, if the real-time temperature information of the power battery reaches a preset second temperature range, the power battery is charged via the OBC according to the power information of the charging gun. This includes: if the real-time temperature information is within the preset second temperature range, the OBC is set to constant voltage mode via the power battery; wherein, constant voltage mode indicates that the output voltage of the OBC is maintained at a preset voltage value; if the power information of the charging gun is equal to or greater than a preset power threshold, the high-voltage relay of the power battery is disconnected, and the PTC heater is activated to heat the power battery via the OBC in constant voltage mode; if it is determined that the real-time temperature information of the power battery meets the preset charging conditions, the power battery is charged via the OBC.

[0065] Specifically, a second temperature range is preset. Upon receiving the charging gun insertion operation, the real-time temperature information of the power battery is acquired, and it is determined whether the real-time temperature falls within the second temperature range. The preset second temperature range covers a relatively cold environment, but not yet extremely cold. For example, the preset second temperature range is between -30°C and -10°C, which covers the critical operating condition where the electrolyte begins to thaw but still does not have the ability to charge normally. The preset second temperature range can be dynamically adjusted to adapt to different electrolyte formulations or different packaging forms. For example, the preset second temperature range can also be configured to be between -35°C and -5°C.

[0066] If the real-time temperature information is within the preset second temperature range, the PTC heater is activated to heat the power battery based on the charging gun's power information. Specifically, if the real-time temperature information is within the preset second temperature range, the OBC can be set to constant voltage mode via the power battery. At this time, the OBC's output voltage can be maintained at a preset voltage value. For example, if the vehicle's high-voltage system has not completed pre-charging and the main positive / main negative relays have not yet closed, the power battery can be used as the initial energy source to drive the OBC into a closed-loop voltage control mode, ensuring that its DC output is stably maintained at a preset voltage value. This voltage value must meet the lower limit of the PTC's rated operating voltage and be higher than the minimum breakdown voltage required for the PTC's cold start.

[0067] Constant voltage mode is a specific operating mode of OBC. The core control logic can be as follows: sample the DC output voltage of OBC, perform PI (proportional-integral) calculation with the reference voltage set in the internal digital controller, and dynamically adjust the frequency and phase shift angle of the primary-side switching transistor of the CLLC topology to keep the output voltage ripple within ±0.5% and the load regulation rate better than ±1%. In this mode, OBC does not respond to changes in AC input and maintains output stability only by using the power battery as the sole energy source.

[0068] A power threshold is preset, for example, 2.2kW. The power information of the charging gun is compared with the preset power threshold. If the power information of the charging gun is equal to or greater than the preset power threshold, the high-voltage relay of the power battery can be disconnected, and then the PTC heater can be started through the OBC in constant voltage mode to heat the power battery. Disconnecting the high-voltage relay of the power battery means that the BMS sends a command to the high-voltage distribution box to control all or part of the main positive relay, main negative relay, and pre-charge relay to disconnect, cutting off the electrical connection between the power battery and the DC input terminal of the OBC and the PTC heating circuit. This action occurs after the OBC has stably entered constant voltage mode, ensuring that the energy source for PTC startup is completely switched to the OBC output terminal, avoiding irreversible decline in SOC (State of Charge) due to continuous discharge of the power battery. In this embodiment, the disconnection operation can be controlled by time-sequence, first disconnecting the main negative relay, and then disconnecting the main positive relay after a 50ms delay, in order to suppress the arc energy at the moment of disconnection; alternatively, only the main negative relay can be disconnected while keeping the main positive relay closed, and a unipolar heating circuit can be constructed by utilizing the potential difference between the OBC output terminal and the positive terminal of the power battery, thereby reducing the number of relay actions and the failure rate.

[0069] Provided the OBC DC output voltage stabilizes at a preset value, the BMS closes the heating relay in the PTC heating circuit, creating a complete current path consisting of the OBC output, heating relay, PTC body, and circuit ground. Due to its low resistance in the cold state, the PTC experiences a large current surge, rapidly heating up and entering the positive temperature coefficient region, where its resistance increases exponentially until it stabilizes at a low-power constant-temperature heating state. This entire process is supported by the constant voltage output of the OBC and does not rely on a power battery.

[0070] Real-time temperature information is a prerequisite for triggering constant-voltage mode, determining whether the system enters the "heat up first, then charge" process. The setting of the second temperature range defines the applicable boundaries of OBC constant-voltage startup, avoiding accidental heating at excessively high temperatures leading to energy waste, or insufficient voltage feedback due to complete electrolyte solidification at excessively low temperatures. Activating OBC constant-voltage mode via the power battery essentially transforms the power battery from an "energy source" to a "control-enabled energy source." The comparison between the charging gun power information and the power threshold is the key criterion for deciding whether to execute relay switching. Power supply to the power battery is only cut off when the external input power is sufficient, realizing the functional transfer of the energy supply source and ensuring the safety isolation and continuity of energy supply during the heating process.

[0071] The beneficial effect of this setup is that it enables the activation of the OBC constant voltage output capability without relying on the conventional high-voltage pre-charge process when the power battery is in a low-temperature critical operating condition. Based on the actual available power of the charging gun, it intelligently decides whether to switch the PTC heating energy from the power battery to the OBC's own output. Thus, while ensuring the system's safety isolation, it avoids deep discharge damage to the power battery at low temperatures, ensures the reliable start-up and continuous operation of the PTC heating function, reduces the battery pack heating dependence on the power battery in low-temperature environments, and improves the success rate of AC charging heating start-up and system energy utilization efficiency.

[0072] In this embodiment, setting the OBC to constant voltage mode via the power battery includes: pre-charging the high-voltage bus via the power battery; if the voltage of the high-voltage bus remains within a preset voltage range, then the OBC is activated and set to constant voltage mode.

[0073] Specifically, the power battery is a lithium-ion battery pack used in electric vehicles to drive the motor and support the power supply of high-voltage accessories, possessing the ability to discharge large currents instantaneously. The high-voltage bus refers to the connection between the positive and negative output terminals of the power battery and the vehicle's PDU, OBC input terminals, PTC heater, DC-DC converter, etc., and features low impedance and high thermal stability. Pre-charge power-on processing is a safety procedure before the high-voltage system is powered on, aiming to limit inrush current, prevent relay contact arcing, and prevent overvoltage breakdown of power devices. The specific process can be: the BMS controls the closure of the main negative relay and the pre-charge relay, allowing the power battery to slowly charge the high-voltage bus capacitor through the pre-charge resistor; the pre-charge time can be set to 100-500ms, dynamically calculated by the BMS based on the bus capacitor value and the pre-charge resistor value. In this embodiment, the power battery, as an energy source, can independently complete pre-charge before the vehicle is connected to an external AC power source or before communication / power confirmation is established, even if the power source is plugged in.

[0074] A voltage range is preset, and the high-voltage bus voltage within a preset time window is acquired. The high-voltage bus voltage can be detected in real time by a high-voltage sampling circuit located at the PDU input. It is determined whether the high-voltage bus voltage remains within the preset voltage range within the preset time window. For example, if the voltage falls within the preset voltage range for five consecutive sampling cycles, and the absolute value of the difference between adjacent cycles is <2 V, then it is determined that the voltage remains stable.

[0075] If the voltage of the high-voltage bus has not yet been maintained within the preset voltage range, the voltage of the high-voltage bus will continue to be monitored. If the voltage of the high-voltage bus is maintained within the preset voltage range, the OBC can be activated. For example, the BMS sends an enable signal to the OBC main control MCU, triggering the soft start of the PFC circuit inside the OBC and synchronously initializing the CLLC resonant converter drive timing. Then, the OBC is set to constant voltage mode. Constant voltage control can be achieved by adjusting the phase shift angle and frequency of the CLLC primary-side switching transistor. In this mode, the OBC does not charge the power battery, but only maintains a stable output from the high-voltage bus, providing a reliable DC power supply foundation for subsequent PTC heating.

[0076] The beneficial effect of this setting is that it enables safe pressure building up of the high-voltage busbar in low-temperature environments and reliable activation of the OBC to enter constant-pressure working mode, ensuring the robust operation capability of the AC charging and heating process across the entire temperature range and in the full charging mode.

[0077] In this embodiment, the method further includes: if the power information of the charging gun is less than a preset power threshold, the PTC heater is activated through the power battery to heat the power battery, and the power information of the PTC is obtained in real time; if the power information of the PTC is maintained within the preset power range, the high voltage relay of the power battery is disconnected, and the PTC heater is controlled by the OBC in constant voltage mode to heat the power battery.

[0078] Specifically, if the power information of the charging gun is less than the preset power threshold, it indicates that the available power of the charging gun is limited and insufficient to independently drive the PTC heater. In this case, heating can be carried out in stages based on the instantaneous discharge capacity of the power battery and the constant voltage output of the OBC.

[0079] If the real-time temperature information is within the preset second temperature range, the power battery is pre-charged and the magnetic integrated power supply is started, setting the OBC to constant voltage mode. At this time, the power information of the charging gun is less than the preset power threshold, the power battery is the main power source, the PTC is connected to the bus, and a large current is required at startup, that is, the PTC heater is started through the power battery.

[0080] PTC stands for Positive Temperature Coefficient Thermistor. As it is heated, its resistance increases dramatically. With the bus voltage remaining relatively constant, the increased resistance of the PTC leads to a significant decrease in its power consumption until a steady state is reached. For example, the PTC power might decrease from 6kW at startup to a smaller, stable value, such as 1.5kW. The BMS continuously monitors the power. When it determines that the PTC power is within a preset power range over a preset time window, the BMS can issue a command to disconnect the high-voltage relay of the power battery. At this point, the only power source on the high-voltage bus becomes the OBC. The OBC's capacity is equal to or greater than the PTC's demand; for example, if the PTC's demand is 1.5kW, the OBC's capacity is 2kW. The OBC operates in constant voltage mode, continuously striving to maintain the bus voltage. When the power battery is disconnected, the OBC detects a slight fluctuation in the bus voltage and immediately increases the power drawn from the grid, completely taking over the load, i.e., the PTC, and continuing to maintain voltage stability. For the PTC load, the voltage across its terminals remains stable, and its operating conditions, such as temperature, resistance, and power, do not undergo sudden changes. Therefore, it can continue heating continuously and stably at a low power.

[0081] The beneficial effect of this setup is that, under conditions of limited AC charging gun power, a two-stage PTC heating mechanism is achieved, using the power battery as the initial energy source and the OBC as the takeover energy source. In the initial stage, the charging gun power is relatively low, causing the OBC to be unable to provide the power required for PTC independently. Therefore, the instantaneous discharge capacity of the power battery is introduced to complete the start-up impact. Once the PTC power enters the steady-state range, indicating that thermal equilibrium has been established, the power battery supply is promptly cut off to protect the cell life. The OBC seamlessly takes over the heating task the moment the relay disconnects, ensuring continuous heat flow and effectively improving charging efficiency.

[0082] In this embodiment, the magnetic integrated power supply integrates an OBC and a DC-DC converter. Based on real-time temperature information and the power information of the charging gun, the PTC heater is activated to heat the power battery. This includes: if the real-time temperature information is within a preset first temperature range, then based on a preset degradation strategy, the OBC and / or DC-DC converter are degraded to obtain the heat released by the magnetic integrated power supply; wherein, the preset degradation strategy is used to increase energy loss; the power battery is heated by the heat released by the magnetic integrated power supply until the real-time temperature information is within a preset second temperature range. If the real-time temperature information is within the preset second temperature range, then based on the power information of the charging gun, the PTC heater is activated to heat the power battery, and then the power battery is charged through the OBC.

[0083] Specifically, a first temperature range is preset, which is lower than a second temperature range. For example, the first temperature range is below -35°C, representing an extremely cold environment. Within the first temperature range, the electrolyte freezes, preventing pre-charging. In this case, a preset degradation strategy is needed to degrade the OBC and / or DC-DC converter in the magnetic integrated power supply, achieving self-heating through degradation. This allows the heat released by the magnetic integrated power supply to be transferred to the power battery, enabling the battery to heat up. The vehicle's thermal management system can then transfer this heat to the power battery.

[0084] The preset degradation strategy refers to the control logic that actively reduces power conversion efficiency to directionally convert electrical energy into heat energy. Essentially, it increases the conduction losses, switching losses, and eddy current / hysteresis losses of semiconductor devices. In this embodiment, the preset degradation strategy is not specifically limited.

[0085] After receiving heat, the power battery's temperature gradually rises until it reaches a preset second temperature range. If the real-time temperature information is within the preset second temperature range, the OBC (On-Board Charger) is set to constant voltage mode via the power battery. If the charging gun's power information is equal to or greater than a preset power threshold, the high-voltage relay of the power battery is disconnected, and the PTC heater is activated via the constant voltage mode OBC to heat the power battery. If the charging gun's power information is less than the preset power threshold, the PTC heater is activated via the power battery to heat the power battery, and the PTC power information is acquired in real time. If the PTC power information remains within the preset power range, the high-voltage relay of the power battery is disconnected, and the PTC heater is controlled via the constant voltage mode OBC to heat the power battery.

[0086] The beneficial effect of this setup is that, under extreme conditions where the power battery completely loses its pre-charge capability due to electrolyte solidification, it does not rely on any external heat source or the power battery itself to discharge. Instead, it utilizes the AC side input energy from the magnetically integrated OBC and DC-DC converter to generate heat through active efficiency reduction and directional conduction, thereby raising the battery pack temperature and restoring the pre-charge function. This creates the necessary conditions for subsequent PTC heating and normal AC charging, improving the charging availability and system robustness of electric vehicles in extremely cold regions.

[0087] In this embodiment, the OBC in the magnetic integrated power supply is equipped with a PFC circuit, and the DC-DC converter in the magnetic integrated power supply is equipped with a secondary circuit. Based on a preset degradation strategy, the OBC and / or DC-DC converter are degraded to obtain the heat energy released by the magnetic integrated power supply. This includes: based on a preset degradation strategy, the PFC circuit and / or the secondary circuit are degraded to obtain the heat energy released by the magnetic integrated power supply.

[0088] Specifically, the magnetic integrated power supply is equipped with a PFC circuit and a DC-DC secondary circuit. The preset derating strategy can be used to reduce the efficiency of the PFC circuit inside the OBC and reduce the efficiency of the DC-DC secondary circuit to achieve derating and self-heating.

[0089] For example, for PFC circuits, preset degradation strategies could include changing the switching frequency, moving it away from the resonant point, or intentionally using hard switching to significantly increase switching losses and generate heat; adjusting the inductor current to control it to operate at the critical state between continuous and intermittent operation, or introducing larger current ripple to increase core and copper losses; and degrading the modulation strategy by using a non-optimal PWM modulation method to increase the conduction time or voltage stress of the devices. For DC-DC secondary circuits, preset degradation strategies could include disabling synchronous rectification and forcing the use of the secondary diode for rectification, which would generate huge conduction losses that directly translate into heat; intentionally increasing the dead time, during which current is forced to flow through the body diode, further increasing losses; and increasing output ripple by controlling the output voltage ripple, which would increase the equivalent series resistance loss of the filter capacitor and the magnetic component loss. It can also make OBC and DCDC work together to create harsh conditions for each other. OBC provides an unstable input voltage with huge ripple to DCDC, forcing DCDC to work under worse conditions and with lower efficiency; DCDC feeds back a drastically fluctuating load to OBC, forcing OBC's PFC and transformer to work in an unsteady state and increasing losses.

[0090] The magnetic integrated structure provides a physical basis for the thermal coupling of PFC and DCDC, enabling the heat generated by the two to be efficiently gathered through a shared heat dissipation substrate and liquid cooling channel.

[0091] The advantage of this design is that when the power battery completely loses its pre-charge capability due to electrolyte solidification, it does not require any external heating device or power battery discharge. Instead, it utilizes the inherent topological characteristics of the magnetically integrated OBC and DC-DC converter to precisely and controllably reduce the efficiency of the PFC circuit and the secondary circuit of the DC-DC converter. This directs the input electrical energy into heat energy, which is then conducted to the power battery via the thermal management system, thus actively heating and defrosting the battery pack. This approach saves costs and improves charging efficiency.

[0092] S303. If it is determined that the real-time temperature information meets the preset charging conditions, the power battery is charged through the OBC.

[0093] For example, charging conditions are preset. After the power battery is charged via PTC, the battery temperature gradually rises. Real-time temperature information of the power battery is acquired to determine whether the current real-time temperature information meets the preset charging conditions. For example, the preset charging conditions can be a preset temperature threshold. If the real-time temperature information reaches the preset temperature threshold, it is considered that the real-time temperature information meets the preset charging conditions. If the real-time temperature information does not reach the preset temperature threshold, the real-time temperature information continues to be monitored.

[0094] Once the real-time temperature information confirms that the preset charging conditions are met, it indicates that the battery pack temperature has reached the charging threshold. At this point, the power battery can be charged via the OBC, entering the normal AC charging process. For example, the OBC can output a stable DC current in a constant current state, which flows through the high-voltage bus, PDU (Power Distribution Unit), and current sensor before flowing into the positive terminal of the power battery, completing the charge injection.

[0095] Activating the PTC heater is a necessary pre-processing step when the battery pack temperature is below the standard. OBC charging is only allowed after the temperature reaches the standard. This enables precise, phased, and multi-source coordinated thermal management and charging control of the power battery in extremely low temperature environments. It significantly improves the success rate of AC charging start-up and system safety of electric vehicles in cold conditions, and enhances the convenience and reliability for users in low-temperature winter scenarios.

[0096] In this embodiment, if it is determined that the real-time temperature information meets the preset charging conditions, the power battery is charged through the OBC, including: if it is determined that the real-time temperature information meets the preset charging conditions, the high-voltage relay of the power battery is closed, and the OBC is set to constant current mode; wherein, constant current mode indicates that the output current of the OBC is maintained at a preset current value; the power battery is charged through the OBC in constant current mode.

[0097] Specifically, during the heating process of the power battery via the PTC heater, the real-time temperature information of the power battery is acquired, and it is determined whether the real-time temperature meets the preset charging conditions. If not, heating continues; if it does meet the conditions, it indicates that the power battery temperature has reached the charging threshold. At this point, the high-voltage relays of the power battery, including the main positive relay, the main negative relay, and the pre-charge relay, can be closed, and the closing sequence follows the safe power-on logic. Then, the OBC is set to constant current mode, which indicates that the output current of the OBC is maintained at a preset current value. The power battery is then charged through the OBC in constant current mode, entering the normal AC charging process.

[0098] In this embodiment, after responding to the insertion operation of the charging gun, the real-time temperature information of the power battery is obtained. If the real-time temperature information is neither within the second temperature range nor within the first temperature range, it indicates that the vehicle is not currently in a cold environment and can be charged normally.

[0099] The beneficial effect of this setting is that, under the premise that the temperature of the power battery rises after the initial heating and meets the safe charging boundary conditions, the BMS accurately triggers the high-voltage circuit to be connected, and works with the OBC to quickly enter the controlled constant current output state and start the energy injection process, achieving effects such as smooth charging start-up, extended battery life, and improved system functional safety level.

[0100] This invention provides a charging method for electric vehicles. The electric vehicle is equipped with a magnetically integrated power supply and a power battery. The magnetically integrated power supply incorporates an on-board charger (OBC), achieving a high degree of integration and functional reuse of the power system. By responding to the insertion of the charging gun, the power information of the charging gun can be determined, i.e., the power supply capability of the external charging facility can be identified. Real-time temperature information of the current environment is acquired. Based on the real-time temperature information and the power information of the charging gun, different environmental conditions are dynamically adapted, thereby controlling the OBC to charge the power battery. By comprehensively considering real-time temperature information and charging gun power information, this invention can cope with different environments and external charging facilities, significantly improving the reliability and adaptability of AC charging under different environments and increasing battery charging efficiency.

[0101] Figure 4 This is a schematic flowchart illustrating a charging method for electric vehicles, provided as an embodiment of the present invention. This embodiment is an optional embodiment based on the above embodiments. Figure 4 As shown, the method includes the following steps:

[0102] S401. The vehicle is charged by plugging in an AC charging gun when it is in extremely low temperature conditions.

[0103] S402. Determine whether the power battery can be connected to high voltage, that is, determine whether the real-time temperature information of the power battery is within a preset second temperature range or a preset first temperature range. If it is within the preset second temperature range, it can be connected to high voltage; if it is within the preset first temperature range, it cannot be connected to high voltage. If it can be connected to high voltage, proceed to S403; if it cannot be connected to high voltage, proceed to S416.

[0104] S403 is powered by pre-charging of the power battery.

[0105] S404. Start DC-DC and OBC, and set OBC to constant voltage mode.

[0106] S405. Determine if the charging gun has sufficient power to drive the PTC to start, i.e., determine if the power information of the charging gun is equal to or greater than the preset power threshold. If yes, it can drive the PTC to start; otherwise, it cannot drive the PTC to start. If it can drive the PTC to start, proceed to S406; if it cannot drive the PTC to start, proceed to S412.

[0107] S406, Disconnect the high-voltage relay of the power battery.

[0108] S407. The PTC heater is activated via OBC to heat the battery pack of the power battery.

[0109] S408. Determine whether the battery pack temperature has reached the rechargeable threshold, i.e., whether it has reached the preset temperature threshold. If yes, proceed to S409; otherwise, proceed to S407.

[0110] S409, Close the high voltage relay of the power battery.

[0111] S410 and OBC are set to constant current mode.

[0112] S411, Perform the normal AC charging process.

[0113] S412, The power battery pack is heated by starting the PTC heater through the power battery.

[0114] S413. Determine if the PTC is stable at low power. If yes, execute S414; otherwise, execute S412.

[0115] S414. Disconnect the high-voltage relay of the power battery, and the PTC will heat at a stable low power.

[0116] S415. Check if the battery pack temperature has reached the rechargeable threshold, i.e., whether it has reached the preset temperature threshold. If yes, execute S409; otherwise, execute S414.

[0117] S416, Start DCDC.

[0118] S417. By reducing the efficiency of the PFC circuit inside the OBC and reducing the efficiency of the secondary side of the DC-DC converter, self-heating with reduced efficiency is achieved.

[0119] S418: The thermal management system transfers the heat generated by the OBC and DC-DC converter to the power battery.

[0120] S419. Determine whether the power battery can be connected to high voltage, that is, determine whether the real-time temperature information of the power battery is within a preset second temperature range or a preset first temperature range. If it is within the preset second temperature range, it can be connected to high voltage; if it is within the preset first temperature range, it cannot be connected to high voltage. If it can be connected to high voltage, execute S403; if it cannot be connected to high voltage, execute S417.

[0121] Figure 5 This diagram illustrates a structural schematic of a charging device for an electric vehicle according to an embodiment of the present invention. The electric vehicle incorporates a magnetic integrated power supply, a power battery, and a PTC heater; the magnetic integrated power supply integrates an OBC (On-Board Charger). Figure 5 As shown, the device 500 includes: an information determination module 510 and a battery charging module 520.

[0122] The information determination module 510 is used to respond to the insertion operation of the charging gun, determine the power information of the charging gun, and obtain the real-time temperature information of the power battery.

[0123] The battery heating module 520 is used to heat the power battery via a magnetic integrated power supply if the real-time temperature information of the power battery is within a preset first temperature range.

[0124] The battery charging module 530 is used to charge the power battery via OBC according to the power information of the charging gun if the real-time temperature information of the power battery reaches the preset second temperature range; wherein the numerical range of the preset first temperature range is smaller than the numerical range of the preset second temperature range.

[0125] In one alternative embodiment, the magnetic integrated power supply integrates an OBC and a DC-DC converter; the battery heating module 520 includes:

[0126] The self-heating unit is used to reduce the efficiency of the OBC and / or DC-DC based on a preset derating strategy if the real-time temperature information is within a preset first temperature range, thereby obtaining the heat released by the magnetic integrated power supply; wherein, the preset derating strategy is used to increase power loss.

[0127] The heating unit is used to heat the power battery by releasing heat through the magnetic integrated power supply.

[0128] In one alternative approach, the OBC in the magnetically integrated power supply is equipped with a PFC circuit, and the DC-DC converter in the magnetically integrated power supply is equipped with a secondary-side circuit; the self-heating unit is specifically used for:

[0129] Based on a preset degradation strategy, the PFC circuit and / or secondary circuit are degraded to obtain the heat energy released by the magnetic integrated power supply.

[0130] In one alternative embodiment, the battery charging module 530 includes:

[0131] The constant voltage unit is used to set the OBC to constant voltage mode via the power battery if the real-time temperature information is within a preset second temperature range; wherein, constant voltage mode indicates that the output voltage of the OBC is maintained at a preset voltage value.

[0132] The starting unit is used to disconnect the high-voltage relay of the power battery and start the PTC heater to heat the power battery through the OBC in constant voltage mode if the power information of the charging gun is equal to or greater than the preset power threshold.

[0133] The charging unit is used to charge the power battery via OBC if it is determined that the real-time temperature information of the power battery meets the preset charging conditions.

[0134] In one alternative approach, the constant voltage unit is specifically used for:

[0135] The high-voltage bus is pre-charged by the power battery. If the voltage of the high-voltage bus is maintained within the preset voltage range, the OBC is activated and set to constant voltage mode.

[0136] In one alternative approach, it also includes:

[0137] The PTC start-up module is used to start the PTC heater to heat the power battery if the power information of the charging gun is less than the preset power threshold, and to obtain the power information of the PTC in real time.

[0138] The battery heating module is used to disconnect the high-voltage relay of the power battery if the power information of the PTC is maintained within the preset power range, and to control the PTC heater to heat the power battery through the OBC in constant voltage mode.

[0139] In one alternative embodiment, the charging unit is specifically used for:

[0140] If the real-time temperature information is determined to meet the preset charging conditions, the high-voltage relay of the power battery is closed, and the OBC is set to constant current mode; wherein, constant current mode means that the output current of the OBC is maintained at a preset current value.

[0141] The power battery is charged via OBC in constant current mode.

[0142] In one alternative embodiment, the information determination module 510 includes:

[0143] The signal acquisition unit is used to respond to the insertion operation of the charging gun, acquire the resistance signal of the connection confirmation CC contact, and acquire the pulse width modulation (PWM) signal and AC voltage signal of the control guidance CP contact;

[0144] The power determination unit is used to determine the power information of the charging gun based on the resistance signal, PWM signal, and AC voltage signal.

[0145] This invention provides a charging device for electric vehicles. The electric vehicle incorporates a magnetically integrated power supply and a power battery. The magnetically integrated power supply integrates an On-Board Charger (OBC), achieving a high degree of integration and functional reuse of the power system. By responding to the insertion of the charging gun, the power information of the charging gun can be determined, thus identifying the power supply capacity of the external charging facility. Real-time ambient temperature information is acquired. Based on this real-time temperature information and the charging gun's power information, the device dynamically adapts to different environmental conditions. In extremely low temperatures, the power battery is heated by the self-heating of the magnetically integrated power supply. Once the battery temperature rises to a certain range, the OBC is controlled to charge the power battery. By comprehensively considering real-time temperature information and charging gun power information, this invention can cope with different environments and external charging facilities, significantly improving the reliability and adaptability of AC charging under different conditions and increasing battery charging efficiency.

[0146] Figure 6 The diagram shows a structural schematic of an electronic device provided by an embodiment of the present invention. The electronic device may be an in-vehicle terminal. The specific implementation of the electronic device is not limited by the specific embodiments of the present invention.

[0147] like Figure 6 As shown, the electronic device may include: a processor 602, a communications interface 604, a memory 606, and a communications bus 608.

[0148] The processor 602, communication interface 604, and memory 606 communicate with each other via communication bus 608. Communication interface 604 is used to communicate with other network elements such as clients or other servers. The processor 602 executes program 610, specifically performing the relevant steps in the above-described embodiment of the electric vehicle charging method.

[0149] Specifically, program 610 may include program code, which includes computer-executable instructions.

[0150] Processor 602 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The electronic device includes one or more processors, which may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0151] Memory 606 is used to store program 610. Memory 606 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0152] Specifically, program 610 can be called by processor 602 to cause the electronic device to perform the following operations:

[0153] In response to the insertion of the charging gun, the power information of the charging gun is determined, and the real-time temperature information of the power battery is obtained.

[0154] Based on real-time temperature information and charging gun power information, the OBC is controlled to charge the power battery.

[0155] This invention provides a computer-readable storage medium storing at least one executable instruction that, when executed on an electronic device, causes the electronic device to perform the electric vehicle-based charging method in any of the above method embodiments.

[0156] Executable instructions can be used to cause an electronic device to perform the following operations:

[0157] In response to the insertion of the charging gun, the power information of the charging gun is determined, and the real-time temperature information of the power battery is obtained.

[0158] Based on real-time temperature information and charging gun power information, the OBC is controlled to charge the power battery.

[0159] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other device. Furthermore, the embodiments of this invention are not directed to any particular programming language.

[0160] It should be noted that the aforementioned computer-readable storage media can be ROM, Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Ferromagnetic Random Access Memory (FRAM), Flash Memory, Magnetic Surface Memory, Optical Disc, or Compact Disc Read-Only Memory (CD-ROM), etc.; or it can be various electronic devices including one or any combination of the above-mentioned memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0161] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the description of exemplary embodiments of the invention above, various features of the embodiments are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0162] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0163] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A charging method for electric vehicles, characterized in that, The electric vehicle is equipped with a magnetic integrated power supply, a power battery, and a positive temperature coefficient (PTC) heater; the magnetic integrated power supply integrates an on-board charger (OBC); the method includes: In response to the insertion of the charging gun, the power information of the charging gun is determined, and the real-time temperature information of the power battery is obtained. If the real-time temperature information of the power battery is within a preset first temperature range, then the power battery is heated by the magnetic integrated power supply. If the real-time temperature information of the power battery reaches the preset second temperature range, the power battery is charged through the OBC according to the power information of the charging gun; wherein, the numerical range of the preset first temperature range is smaller than the numerical range of the preset second temperature range.

2. The method according to claim 1, characterized in that, The magnetic integrated power supply integrates an OBC (On-Board Converter) and a DC-DC converter; if the real-time temperature information of the power battery is within a preset first temperature range, the power battery is heated by the magnetic integrated power supply, including: If the real-time temperature information is within a preset first temperature range, then based on a preset degradation strategy, the OBC and / or the DC-DC converter are degraded to obtain the heat released by the magnetic integrated power supply; wherein, the preset degradation strategy is used to increase power loss. The heat released by the magnetic integrated power supply is used to heat the power battery.

3. The method according to claim 2, characterized in that, The OBC in the magnetically integrated power supply is equipped with a power factor correction (PFC) circuit, and the DC-DC converter in the magnetically integrated power supply is equipped with a secondary-side circuit. Based on a preset degradation strategy, the OBC and / or the DC-DC converter are degraded to obtain the heat energy released by the magnetically integrated power supply, including: Based on a preset degradation strategy, the PFC circuit and / or the secondary circuit are degraded to obtain the heat energy released by the magnetic integrated power supply.

4. The method according to claim 1, characterized in that, If the real-time temperature information of the power battery reaches a preset second temperature range, then the power battery is charged through the OBC according to the power information of the charging gun, including: If the real-time temperature information is within a preset second temperature range, then the OBC is set to constant voltage mode via the power battery; wherein, the constant voltage mode indicates that the output voltage of the OBC is maintained at a preset voltage value; If the power information of the charging gun is equal to or greater than the preset power threshold, the high voltage relay of the power battery is disconnected, and the PTC heater is started through the constant voltage mode OBC to heat the power battery. If the real-time temperature information of the power battery is determined to meet the preset charging conditions, the power battery is charged through the OBC.

5. The method according to claim 4, characterized in that, Setting the OBC to constant voltage mode via the power battery includes: The high-voltage bus is pre-charged by the power battery. If the voltage of the high-voltage bus is maintained within the preset voltage range, the OBC is activated and set to constant voltage mode.

6. The method according to claim 4, characterized in that, Also includes: If the power information of the charging gun is less than the preset power threshold, the PTC heater is activated through the power battery to heat the power battery, and the power information of the PTC is obtained in real time. If the power information of the PTC is maintained within the preset power range, the high-voltage relay of the power battery is disconnected, and the PTC heater is controlled by the OBC in constant voltage mode to heat the power battery.

7. The method according to claim 4, characterized in that, If the real-time temperature information is determined to meet the preset charging conditions, then the power battery is charged through the OBC, including: If the real-time temperature information is determined to meet the preset charging conditions, the high-voltage relay of the power battery is closed, and the OBC is set to constant current mode; wherein, the constant current mode indicates that the output current of the OBC is maintained at a preset current value; The power battery is charged via the OBC in constant current mode.

8. The method according to any one of claims 1-7, characterized in that, In response to the insertion of the charging gun, the power information of the charging gun is determined, including: In response to the insertion of the charging gun, the resistance signal of the connection confirmation CC contact is acquired, as well as the pulse width modulation (PWM) signal and AC voltage signal of the control guidance CP contact are acquired; The power information of the charging gun is determined based on the resistance signal, the PWM signal, and the AC voltage signal.

9. A charging device for electric vehicles, characterized in that, The electric vehicle is equipped with a magnetic integrated power supply, a power battery, and a positive temperature coefficient (PTC) heater. The magnetic integrated power supply integrates an on-board charger (OBC). The device includes: The information determination module is used to respond to the insertion operation of the charging gun, determine the power information of the charging gun, and obtain the real-time temperature information of the power battery. A battery heating module is used to heat the power battery via the magnetic integrated power supply if the real-time temperature information of the power battery is within a preset first temperature range. A battery charging module is used to charge the power battery through the OBC according to the power information of the charging gun if the real-time temperature information of the power battery reaches a preset second temperature range; wherein the numerical range of the preset first temperature range is smaller than the numerical range of the preset second temperature range.

10. A computer-readable storage medium, characterized in that, The storage medium stores at least one executable instruction, which, when executed on the electric vehicle-based charging device, causes the electric vehicle-based charging device to perform the operation of the electric vehicle-based charging method as described in any one of claims 1-8.

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