A battery car charger control system and method with low power buffer function

Abstract

The application discloses a battery car charger control system and method with low-power buffering function, and belongs to the technical field of battery charging. The system comprises the following steps: detecting the cooling efficiency of the charger under different charging powers, setting the highest cooling charging power according to the cooling efficiency; detecting the current ambient temperature; when the current ambient temperature is higher than the mode switching temperature, the system is switched to the harsh environment charging mode; obtaining the lowest charging power of the charging pile; if the lowest charging power is higher than the highest cooling charging power, the lowest charging power is used for charging and timing starts; otherwise, the highest cooling charging power is used for charging and timing starts; when the timing reaches the waiting duration, the charging power is restored to the charging power in the default charging mode. The application has the effects that the battery can be automatically waited to cool down before fast charging is started in a high-temperature environment, and the charging pile will not be powered off due to excessively low output power during the waiting process.

Description

Technical Field

[0001] This invention relates to the field of battery charging, and in particular to a control system and method for a battery-powered vehicle charger with a low-power buffer function. Background Technology

[0002] Most residential communities now have designated charging areas for electric bicycles. Residents typically park their bicycles in the evening to charge and ride them away the next morning. The cycle life of all types of power batteries is strongly correlated with the operating temperature during charging and discharging. During riding, the battery is in a discharging state, and the battery temperature rise is related to factors such as vehicle operating conditions, ambient temperature, and battery health. This temperature rise cannot be controlled by human intervention during riding. After riding, the battery core temperature is generally 5°C to 15°C higher than the ambient temperature. In high summer temperatures, the battery temperature can even exceed 45°C. If charging is started immediately at this time, the internal heat of the battery will continue to accumulate, and the operating temperature will far exceed the rated operating limit, leading to irreversible damage. Prolonged exposure to high temperatures can severely shorten the lifespan of electric vehicle batteries. Therefore, charging should only begin after the battery has cooled down. However, vehicle owners are often unaware that electric vehicle batteries need to be charged only after cooling, typically charging immediately after riding. Public charging stations in residential areas usually use QR codes or cards to confirm charging needs and monitor charging power upon initiation. If the charging power falls below a system threshold, charging will stop. In this situation, if the user wants to wait for the battery to cool down before charging, they must restart the charging station; they cannot disconnect the charger for a period of time before charging.

[0003] The existing technical solutions mentioned above have the following drawbacks: There is a need for a system that can automatically cool down the battery before charging, while ensuring that the charging current is not too low during the waiting process and that the battery cools down naturally while keeping the charging station powered on. Summary of the Invention

[0004] In order to automatically cool down the battery before charging in high-temperature environments, and to prevent the charging current from being too low during the waiting process, this application provides a battery charger control system and method with low-power buffer function.

[0005] On the one hand, the electric vehicle charger control system and method with low-power buffer function provided in this application adopts the following technical solution: A method for controlling a battery charger with low-power buffering function includes the following steps: Set the system's normal charging mode and harsh environment charging mode, and set the mode switching temperature and waiting time; Test the charger's cooling efficiency at different charging powers, and set the maximum cooling charging power based on the cooling efficiency; Detect the current ambient temperature; When the current ambient temperature is higher than the mode switching temperature, the system switches to harsh environment charging mode; When charging begins in a harsh environment charging mode, obtain the minimum charging power of the charging station; If the minimum charging power is higher than the maximum cooling charging power, then the minimum charging power will be used for charging and the timer will start. If the minimum charging power is lower than the maximum cooling charging power, the maximum cooling charging power will be used for charging and the timer will start. When the timer reaches the waiting time, the charging power will be restored to the default charging power.

[0006] By adopting the above solution, when the electric vehicle is connected to the charging station in high-temperature environments such as summer and is about to start charging, it will first use low-power charging to cool down the battery. The system will automatically judge the power value during low-power charging to ensure that the charging station will not lose power while waiting for the battery to cool down, and the waiting time is sufficient for the battery to cool down to a safe temperature, effectively extending the battery life.

[0007] Preferably, the step of "detecting the cooling efficiency of the charger at different charging powers and setting the maximum cooling charging power based on the cooling efficiency" includes the following steps: The highest temperature of the electric vehicle battery under high temperature conditions is detected and used as the set high temperature. Heat the battery of the electric vehicle to a set high temperature and place it in a constant temperature environment where the ambient temperature is equal to the mode switching temperature. The final battery temperature is detected after a charging wait time under different charging powers, and the cooling efficiency is calculated using the set high temperature, the final battery temperature, and the waiting time. Obtain the battery's safe temperature and select the charging power at which the final battery temperature equals the battery's safe temperature as the maximum cooling charging power.

[0008] By adopting the above scheme, accurate cooling efficiency can be obtained by testing the battery. Based on the known safe battery temperature, the charging power required to cool the battery down to its safe temperature at the highest temperature can be determined.

[0009] Preferably, the following steps are also included: Set the desired curvature; An efficiency ratio curve is generated using charging power and cooling efficiency, and a point on the efficiency ratio curve with a curvature equal to the desired curvature is selected. The charging power corresponding to this point is taken as the maximum cooling charging power and is superseded by the original maximum cooling charging power.

[0010] By adopting the above solution, users can set their desired curvature, which is the balance point between cooling efficiency and charging power. The system will then determine the user's desired maximum cooling charging power based on the cooling efficiency, thus covering the preset maximum cooling charging power. This allows for faster cooling while maintaining a certain level of charging efficiency during the battery cooling process.

[0011] Preferably, the following steps are also included: When the charger is connected to the charging station, the charging station detects the current ambient temperature and sends the current ambient temperature back to the charger. The charging pile acquires the electricity price curve and analyzes the off-peak electricity time in the electricity price curve. Get the current time, and calculate the charging start time using the current time and the waiting time. Compare the charging start time with off-peak electricity times; If the charging start time is not during off-peak hours, the waiting time will be extended until the charging start time falls within off-peak hours.

[0012] By adopting the above solution, since the battery itself generates heat, the ambient temperature detected by the charger may be affected by the battery. The charging pile can detect the ambient temperature to avoid interference from battery heat. In addition, the charging pile usually has a built-in electricity price curve, which can be used to automatically plan the charging time, thereby reducing charging costs as much as possible and improving the utilization rate of off-peak electricity.

[0013] Preferably, the following steps are also included: Set the high temperature range value, low temperature range value, high temperature standard charging power, and low temperature standard charging power; When the charging station detects that the ambient temperature is in the high temperature range, the default charging power will be adjusted to the high temperature standard charging power. When the charging station detects that the ambient temperature is in the low-temperature range, it will adjust the default charging power to the low-temperature standard charging power.

[0014] By adopting the above scheme, the charging pile can automatically adjust its default charging power according to the ambient temperature, reducing the charging power in summer and increasing the charging power in winter, thereby further increasing the battery life.

[0015] Preferably, it is characterized by: Set the power replenishment time and duration according to the instructions; When charging is completed using the default charging power, if the current time reaches or exceeds the replenishment time, trickle charging will begin, and the trickle charging will stop after the replenishment time has elapsed. If the current time has not reached the charging time, charging will be paused. Trickle charging will begin once the current time reaches the charging time, and charging will stop after the trickle charging time has elapsed.

[0016] By adopting the above solution, since prolonged static charging of the battery can lead to a false charge due to poor fluidity of the internal solution, trickle charging can be performed before the user uses the vehicle. Furthermore, after the user sets the usage time, the system will automatically calculate the charging completion time and determine whether to immediately initiate trickle charging.

[0017] Preferably, after the step "if the minimum charging power is higher than the maximum cooling charging power, then use the minimum charging power to charge and start timing", the following steps are also included: Establish a model for the ratio of actual charging power to charger self-loss power; Increase the charger's self-loss power based on the minimum charging power, and calculate the current actual charging power using a model that compares the actual charging power with the charger's self-loss power, so that the current actual charging power equals the maximum cooling charging power.

[0018] By adopting the above scheme, the charger can indirectly increase its charging power by increasing its own self-loss power.

[0019] On the other hand, the electric vehicle charger control system and method with low-power buffer function provided in this application adopts the following technical solution: A battery-powered vehicle charger control system with low-power buffer function includes a local control system installed in the charger. The local control system includes a temperature detection module, an experimental calculation module, a status setting module, a charging adjustment module, and a normal charging module. The temperature detection module detects the current ambient temperature; The experimental calculation module detects the cooling efficiency of the charger under different charging powers, sets the maximum cooling charging power based on the cooling efficiency, and transmits the maximum cooling charging power to the charging adjustment module. The status setting module stores a normal charging mode and a harsh environment charging mode, and presets a mode switching temperature. The status setting module calls the current ambient temperature detected by the temperature detection module. When the current ambient temperature is higher than the mode switching temperature, it transmits the harsh environment charging mode to the charging adjustment module. When the current ambient temperature is less than or equal to the mode switching temperature, it transmits the normal charging mode to the charging adjustment module. When the charging adjustment module detects the start of charging, if it receives a harsh environment charging mode, it obtains the minimum charging power of the charging pile and compares the minimum charging power with the maximum cooling charging power. If the minimum charging power is higher than the maximum cooling charging power, it uses the minimum charging power to charge and starts timing. If the minimum charging power is lower than the maximum cooling charging power, it uses the maximum cooling charging power to charge and starts timing. When the timing reaches the waiting time, it sends a confirmation signal to the normal charging module. After receiving the confirmation signal, the normal charging module restores the charging power to the default charging power.

[0020] By adopting the above solution, when the electric vehicle is connected to the charging station in high-temperature environments such as summer and is about to start charging, it will first use low-power charging to cool down the battery. The system will automatically judge the power value during low-power charging to ensure that the charging station will not lose power while waiting for the battery to cool down, and the waiting time is sufficient for the battery to cool down to a safe temperature, effectively extending the battery life.

[0021] Preferably, it also includes a site control system installed on the charging pile, the site control system including an ambient temperature detection module, a data acquisition module, and a charging control module; The ambient temperature detection module detects the current ambient temperature and transmits it to the local control system. The data acquisition module acquires the electricity price curve and the current time, analyzes the off-peak electricity time in the electricity price curve, and transmits the off-peak electricity time and the current time to the charging control module. The charging control module calls the waiting time of the local control system, calculates the charging start time based on the current time and the waiting time, compares the charging start time with the off-peak electricity time, and if the charging start time is not within the off-peak electricity time, the waiting time is extended until the charging start time reaches the off-peak electricity time.

[0022] By adopting the above solution, since the battery itself generates heat, the ambient temperature detected by the charger may be affected by the battery. The charging pile can detect the ambient temperature to avoid interference from battery heat. In addition, the charging pile usually has a built-in electricity price curve, which can be used to automatically plan the charging time, thereby reducing charging costs as much as possible and improving the utilization rate of off-peak electricity.

[0023] Preferably, it also includes a remote control system located on a mobile device, wherein the remote control system transmits the power replenishment time and power replenishment duration to the site control system; The charging control module receives the charging time and charging duration. After charging with the default charging power is completed, if the current time reaches or exceeds the charging time, trickle charging will be performed. The trickle charging will stop after the charging duration. If the current time has not reached the charging time, charging will be paused. Trickle charging will be performed after the current time reaches the charging time. The trickle charging will stop after the charging duration.

[0024] By adopting the above solution, since prolonged static charging of the battery can lead to a false charge due to poor fluidity of the internal solution, trickle charging can be performed before the user uses the vehicle. Furthermore, after the user sets the usage time, the system will automatically calculate the charging completion time and determine whether to immediately initiate trickle charging.

[0025] In summary, the present invention has the following beneficial effects: 1. The system automatically determines the power value during low-power charging, ensuring that the charging station will not lose power while waiting for the battery to cool down, and that the waiting time is sufficient for the battery to cool down to a safe temperature, effectively extending battery life. Attached Figure Description

[0026] Figure 1 This is an overall flowchart of Embodiment 1 of this application.

[0027] Figure 2 This is an overall system block diagram of Embodiment 2 of this application.

[0028] Explanation of reference numerals in the attached figures: 1. Local control system; 11. Temperature detection module; 12. Experimental calculation module; 13. Status setting module; 14. Charging adjustment module; 15. Normal charging module; 2. Site control system; 21. Ambient temperature detection module; 22. Data acquisition module; 23. Charging control module; 3. Remote control system. Detailed Implementation

[0029] Example 1: This application discloses a control method for a battery charger with low-power buffering function, such as... Figure 1 As shown, the specific steps are as follows: Configure the system's normal charging mode and harsh environment charging mode, setting the mode switching temperature, waiting time, desired curvature, high temperature range value, low temperature range value, high temperature standard charging power, and low temperature standard charging power. The waiting time is affected by ambient temperature; the following is an example: Ambient temperature ≥ 35℃: Delay waiting time 45 minutes; 30℃ ≤ Ambient temperature < 35℃: Delay waiting time is 30 minutes; 25℃ ≤ Ambient temperature < 30℃: Delay waiting time 20 minutes; 15℃ ≤ Ambient temperature < 25℃: Delay waiting time 10 minutes; Ambient temperature < 15℃: Delay waiting time 0 minutes.

[0030] The highest temperature of the electric vehicle battery under high-temperature conditions is detected and used as the set high-temperature temperature. The high-temperature environment is determined based on the perceived temperature of typical hot days in the local area. The highest perceived temperature recorded in past local weather data can be used. The temperature of the electric vehicle battery after intensive use for a certain period of time under this temperature is detected and used as the maximum temperature.

[0031] The battery of the electric vehicle is heated to a set high temperature and then placed in a constant temperature environment where the ambient temperature is equal to the mode switching temperature.

[0032] The final battery temperature after charging waiting time at different charging powers is detected, and the cooling efficiency is calculated using the set high temperature, the final battery temperature, and the waiting time. The cooling efficiency can be calculated by subtracting the final battery temperature from the set high temperature and then dividing by the waiting time, removing interfering parameters to obtain the cooling efficiency.

[0033] To determine the maximum cooling charging power, the charging power required to bring the battery temperature down to the safe operating temperature is selected. Accurate cooling efficiency can be obtained through battery testing. Given the battery's known safe operating temperature, the charging power required to cool the battery down to its safe operating temperature from its highest possible temperature can be determined.

[0034] An efficiency ratio curve is generated using charging power and cooling efficiency, and a point on the efficiency ratio curve where the curvature equals the desired curvature is selected.

[0035] The charging power corresponding to this point is set as the maximum cooling charging power and overrides the original maximum cooling charging power. Users set their desired curvature, which is the balance point between cooling efficiency and charging power. The system determines the user's desired maximum cooling charging power based on the cooling efficiency and overrides the preset maximum cooling charging power. This maximizes cooling speed while maintaining a certain charging efficiency during the battery cooling process.

[0036] Detect the current ambient temperature. The current charging ambient temperature can be acquired in real time using an NTC thermistor.

[0037] When the current ambient temperature is higher than the mode switching temperature, the system switches to the harsh environment charging mode.

[0038] When charging begins in a harsh environment, the minimum charging power of the charging station is obtained. The minimum charging power varies between different charging stations; the low-power cutoff threshold for mainstream public charging stations in China is 10W (this threshold is typically 5W~15W). The critical value for battery heat generation to equal natural heat dissipation is calibrated as 20W, i.e., the critical power with no temperature rise. The buffer charging power is usually a fixed single value of 15W.

[0039] If the minimum charging power is higher than the maximum cooling charging power, then the minimum charging power will be used for charging and the timer will start.

[0040] If the minimum charging power is lower than the maximum cooling charging power, the maximum cooling charging power will be used for charging and the timer will start.

[0041] When the waiting time is reached, the charging station will use its default charging power. The default charging power can be the charging power selected by the user on the charging station or the charging station's default setting. When entering the default charging power, the charging station will perform constant current charging, constant voltage charging, and trickle charging according to the normal charging process.

[0042] When the charger is connected to the charging station, the charging station detects the current ambient temperature and sends the current ambient temperature back to the charger.

[0043] The charging station obtains the electricity price curve and analyzes the off-peak electricity time in the electricity price curve.

[0044] Get the current time, and calculate the charging start time using the current time and the waiting time.

[0045] Compare the charging start time with off-peak electricity times.

[0046] If the charging start time is not during off-peak hours, the waiting time will be extended until the charging start time falls within off-peak hours. Since the battery itself generates heat, the ambient temperature detected by the charger may be affected by the battery's heat. Charging stations, by detecting ambient temperature, can avoid this interference. Furthermore, charging stations typically have built-in electricity price curves, allowing for automatic planning of charging time to minimize charging costs and maximize the utilization of off-peak electricity.

[0047] When the charging station detects that the ambient temperature is within the high-temperature range, the default charging power will be adjusted to the high-temperature standard charging power.

[0048] When the charging station detects that the ambient temperature is in a low-temperature range, it will adjust the default charging power to the low-temperature standard charging power. The charging station can automatically adjust its default charging power according to the ambient temperature, reducing the charging power in summer and increasing the charging power in winter to further extend battery life.

[0049] Set the power replenishment time and duration according to the instructions.

[0050] After charging is completed using the default charging power, if the current time reaches or exceeds the replenishment time, trickle charging will begin. Trickle charging will stop after the replenishment time has elapsed.

[0051] If the current time has not reached the designated charging time, charging will be paused. Once the designated charging time arrives, trickle charging will begin and will stop after the scheduled charging time. Because prolonged inactivity after charging can lead to a "phantom charge" due to poor fluidity of the battery solution, trickle charging can be initiated before the user uses the vehicle. Furthermore, after the user sets the usage time, the system will automatically calculate the charging completion time and determine whether to immediately begin trickle charging.

[0052] The implementation principle of the electric vehicle charger control system and method with low power buffer function in this application embodiment is as follows: When the electric vehicle is connected to the charging pile in high temperature environment such as summer and is ready to start charging, it will first use low power charging to cool down the battery. The system will automatically judge the power value during low power charging to ensure that the charging pile will not be cut off during the waiting process for the battery to cool down, and the waiting time is sufficient for the battery to cool down to a safe temperature, effectively extending the battery life.

[0053] Example 2: This application discloses a control method for a battery-powered vehicle charger with a low-power buffer function, which differs from Example 1 in that: If the minimum charging power is higher than the maximum cooling charging power, then the minimum charging power will be used for charging and the timer will start.

[0054] Establish a model for the ratio of actual charging power to charger self-loss power.

[0055] The charger's self-discharge power is increased based on the minimum charging power. The current actual charging power is calculated using a model that compares the actual charging power to the charger's self-discharge power, ensuring that the current actual charging power equals the maximum cooling charging power. The charger can indirectly increase its charging power by increasing its self-discharge power. This increase can be achieved by increasing the power of controllable load units, including but not limited to charger cooling fans, adjustable power resistors, energy storage charging / discharging units, and auxiliary heating units.

[0056] Example 3: This application discloses a battery charger control system with low-power buffering function, such as... Figure 2 As shown, the system includes a local control system 1 installed within the charger, a site control system 2 installed in the charging station, and a remote control system 3 installed on a mobile device. The local control system 1, site control system 2, and remote control system 3 are connected wirelessly. The local control system 1 includes a temperature detection module 11, an experimental calculation module 12, a status setting module 13, a charging adjustment module 14, and a normal charging module 15. The site control system 2 includes an ambient temperature detection module 21, a data acquisition module 22, and a charging control module 23.

[0057] Temperature detection module 11 detects the current ambient temperature. Experimental calculation module 12 detects the charger's cooling efficiency at different charging powers, sets the maximum cooling charging power based on the cooling efficiency, and transmits the maximum cooling charging power to charging adjustment module 14.

[0058] The status setting module 13 stores a normal charging mode and a harsh environment charging mode, and presets a mode switching temperature. The status setting module 13 calls the current ambient temperature detected by the temperature detection module 11. When the current ambient temperature is higher than the mode switching temperature, it transmits the harsh environment charging mode to the charging adjustment module 14. When the current ambient temperature is less than or equal to the mode switching temperature, it transmits the normal charging mode to the charging adjustment module 14.

[0059] When the charging adjustment module 14 detects the start of charging, if it receives a harsh environment charging mode, it obtains the minimum charging power of the charging pile and compares it with the maximum cooling charging power. If the minimum charging power is higher than the maximum cooling charging power, it uses the minimum charging power to charge and starts timing. If the minimum charging power is lower than the maximum cooling charging power, it uses the maximum cooling charging power to charge and starts timing. When the timing reaches the waiting time, it sends a confirmation signal to the normal charging module 15. After receiving the confirmation signal, the normal charging module 15 controls the charger to charge using the default charging power of the charging pile.

[0060] The ambient temperature detection module 21 detects the current ambient temperature and transmits it to the local control system 1. The data acquisition module 22 acquires the electricity price curve and the current time, analyzes the off-peak electricity time in the electricity price curve, and transmits the off-peak electricity time and the current time to the charging control module 23.

[0061] The charging control module 23 calls the waiting time of the local control system 1, calculates the charging start time using the current time and the waiting time, and compares the charging start time with the off-peak electricity time. If the charging start time is not within the off-peak electricity time, the waiting time is extended until the charging start time reaches the off-peak electricity time. Since the battery itself generates heat, the ambient temperature detected by the charger may be affected by the battery. The charging pile detects the ambient temperature to avoid interference from battery heat. Furthermore, the charging pile usually has a built-in electricity price curve, which can be used to automatically plan the charging time, minimizing charging costs and maximizing the utilization of off-peak electricity.

[0062] The remote control transmits the charging time and duration to the site control system 2. The charging control module 23 receives the charging time and duration. After charging at the default charging power is completed, if the current time has reached or exceeded the charging time, trickle charging begins. Trickle charging stops after the charging duration. If the current time has not reached the charging time, charging is paused. Trickle charging begins again after the charging time has been reached, and stops after the charging duration. Because prolonged static storage after charging can lead to poor fluidity of the battery solution and resulting in a false charge, trickle charging can be performed before the user uses the vehicle. Furthermore, after the user sets the usage time, the system will automatically calculate the charging completion time and determine whether to immediately begin trickle charging.

[0063] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A control method for a battery-powered vehicle charger with low-power buffering function, characterized in that, Includes the following steps: Set the system's normal charging mode and harsh environment charging mode, and set the mode switching temperature and waiting time; Test the charger's cooling efficiency at different charging powers, and set the maximum cooling charging power based on the cooling efficiency; Detect the current ambient temperature; When the current ambient temperature is higher than the mode switching temperature, the system switches to harsh environment charging mode; When charging begins in a harsh environment charging mode, obtain the minimum charging power of the charging station; If the minimum charging power is higher than the maximum cooling charging power, then the minimum charging power will be used for charging and the timer will start. If the minimum charging power is lower than the maximum cooling charging power, the maximum cooling charging power will be used for charging and the timer will start. When the timer reaches the waiting time, the charging power will be restored to the default charging power.

2. The control method for a battery-powered vehicle charger with low-power buffer function according to claim 1, characterized in that, The step of "detecting the cooling efficiency of the charger at different charging powers and setting the maximum cooling charging power based on the cooling efficiency" includes the following steps: The highest temperature of the electric vehicle battery under high temperature conditions is detected and used as the set high temperature. Heat the battery of the electric vehicle to a set high temperature and place it in a constant temperature environment where the ambient temperature is equal to the mode switching temperature. The final battery temperature is detected after a charging wait time under different charging powers, and the cooling efficiency is calculated using the set high temperature, the final battery temperature, and the waiting time. Obtain the battery's safe temperature and select the charging power at which the final battery temperature equals the battery's safe temperature as the maximum cooling charging power.

3. The control method for a battery-powered vehicle charger with low-power buffer function according to claim 2, characterized in that, It also includes the following steps: Set the desired curvature; An efficiency ratio curve is generated using charging power and cooling efficiency, and a point on the efficiency ratio curve with a curvature equal to the desired curvature is selected. The charging power corresponding to this point is taken as the maximum cooling charging power and is superseded by the original maximum cooling charging power.

4. The control method for a battery-powered vehicle charger with low-power buffer function according to claim 1, characterized in that, It also includes the following steps: When the charger is connected to the charging station, the charging station detects the current ambient temperature and sends the current ambient temperature back to the charger. The charging pile acquires the electricity price curve and analyzes the off-peak electricity time in the electricity price curve. Get the current time, and calculate the charging start time using the current time and the waiting time. Compare the charging start time with off-peak electricity times; If the charging start time is not during off-peak hours, the waiting time will be extended until the charging start time falls within off-peak hours.

5. A control method for a battery-powered vehicle charger with low-power buffering function according to claim 4, characterized in that, It also includes the following steps: Set the high temperature range value, low temperature range value, high temperature standard charging power, and low temperature standard charging power; When the charging station detects that the ambient temperature is in the high temperature range, the default charging power will be adjusted to the high temperature standard charging power. When the charging station detects that the ambient temperature is in the low-temperature range, it will adjust the default charging power to the low-temperature standard charging power.

6. The control method for a battery-powered vehicle charger with low-power buffer function according to claim 4, characterized in that: Set the power replenishment time and duration according to the instructions; When charging is completed using the default charging power, if the current time reaches or exceeds the replenishment time, trickle charging will begin, and the trickle charging will stop after the replenishment time has elapsed. If the current time has not reached the charging time, charging will be paused. Trickle charging will begin once the current time reaches the charging time, and charging will stop after the trickle charging time has elapsed.

7. The control method for a battery-powered vehicle charger with low-power buffer function according to claim 1, characterized in that, The step "If the minimum charging power is higher than the maximum cooling charging power, then use the minimum charging power to charge and start timing" is followed by the following steps: Establish a model for the ratio of actual charging power to charger self-loss power; Increase the charger's self-loss power based on the minimum charging power, and calculate the current actual charging power using a model that compares the actual charging power with the charger's self-loss power, so that the current actual charging power equals the maximum cooling charging power.

8. A battery-powered vehicle charger control system with low-power buffering function, characterized in that: It includes a local control system (1) installed in the charger, the local control system (1) including a temperature detection module (11), an experimental calculation module (12), a status setting module (13), a charging adjustment module (14), and a normal charging module (15); The temperature detection module (11) detects the current ambient temperature; The experimental calculation module (12) detects the cooling efficiency of the charger under different charging power, sets the maximum cooling charging power according to the cooling efficiency, and transmits the maximum cooling charging power to the charging adjustment module (14). The state setting module (13) stores a normal charging mode and a harsh environment charging mode, and presets a mode switching temperature. The state setting module (13) calls the current ambient temperature detected by the temperature detection module (11). When the current ambient temperature is higher than the mode switching temperature, it transmits the harsh environment charging mode to the charging adjustment module (14). When the current ambient temperature is less than or equal to the mode switching temperature, it transmits the normal charging mode to the charging adjustment module (14). When the charging adjustment module (14) detects the start of charging, if it receives the severe environment charging mode, it obtains the minimum charging power of the charging pile and compares the minimum charging power with the maximum cooling charging power. If the minimum charging power is higher than the maximum cooling charging power, it uses the minimum charging power to charge and starts timing. If the minimum charging power is lower than the maximum cooling charging power, it uses the maximum cooling charging power to charge and starts timing. When the timing reaches the waiting time, it sends a confirmation signal to the normal charging module (15). The normal charging module (15) receives the confirmation signal and restores the charging power to the default charging power.

9. A battery charger control system with low-power buffer function according to claim 8, characterized in that: It also includes a site control system (2) installed on the charging pile, the site control system (2) including an ambient temperature detection module (21), a data acquisition module (22), and a charging control module (23); The ambient temperature detection module (21) detects the current ambient temperature and transmits the current ambient temperature to the local control system (1); The data acquisition module (22) acquires the electricity price curve and the current time, analyzes the off-peak electricity time in the electricity price curve, and transmits the off-peak electricity time and the current time to the charging control module (23). The charging control module (23) calls the waiting time of the local control system (1), calculates the charging start time based on the current time and the waiting time, compares the charging start time with the off-peak electricity time, and if the charging start time is not within the off-peak electricity time, extends the waiting time until the charging start time reaches the off-peak electricity time.

10. A battery-powered vehicle charger control system with low-power buffer function according to claim 9, characterized in that: It also includes a remote control system (3) set on a mobile terminal, which transmits the power replenishment time and power replenishment duration to the site control system (2); The charging control module (23) receives the charging time and charging duration. When the charging is finished using the default charging power, if the current time reaches or exceeds the charging time, trickle charging is performed. The trickle charging stops after the charging duration. If the current time has not reached the charging time, the charging is paused. After the current time reaches the charging time, trickle charging is performed. The trickle charging stops after the charging duration.

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