Charging overcurrent protection method and system based on air conditioner power emergency unloading

Abstract

The invention belongs to the technical field of charging protection of electric vehicles or extended-range vehicles or plug-in hybrid vehicles, and particularly relates to a charging overcurrent protection method and system based on air conditioner power emergency unloading, and the method comprises the steps: obtaining a battery charging power request update signal and an air conditioner power unloading occurrence time demand; the sequence of the air conditioner unloading occurrence time and the battery charging power request updating signal is judged according to the air conditioner unloading occurrence time requirement; when the air conditioner unloading occurrence time is before the battery power request updating time, the battery management system increases the current protection threshold value and maintains the current charging power; when the air conditioner unloading occurrence time is after the battery power request updating time, the battery management system reduces the charging power and maintains the current current protection threshold value; by dynamically adjusting the current protection threshold value or the charging power of the battery management system, the surge current generated by air conditioner power unloading is absorbed, over-current protection can be avoided without additional hardware, and the charging stability and the user experience are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging protection for electric vehicles, range-extended vehicles or plug-in hybrid vehicles, and in particular relates to a charging overcurrent protection method and system based on emergency unloading of air-conditioning power. Background Art

[0002] With the rapid development of new energy vehicles, the market share of electric vehicles continues to increase, and the problem of slow charging has become an important factor affecting the development of electric vehicles. How to quickly shorten the charging time of electric vehicles has become more and more urgent. In order to solve the problem of slow charging, major OEMs have increased the high voltage value of the vehicle and increased the charging power; at the same time, battery manufacturers have also made more research and development investments in fast charging of batteries. However, it is often the case that due to reasons on the vehicle side (such as a sharp drop in the charging request current), the charging current output by the charging pile cannot follow in time, resulting in overcurrent protection and charging termination of the vehicle; or the charging pile itself causes the output current to be greater than the charging current required by the vehicle, resulting in charging overcurrent protection problems, which brings a very bad user experience to customers.

[0003] In the prior art, CN 114043902 is directed to discharging excess charging power from the charging pile end to the air-conditioning high-voltage components, discharging the excess power by running the air-conditioning high-voltage components; rather than performing overcurrent protection on the vehicle end, which is highly dependent on the vehicle's hardware conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a charging overcurrent protection method, a vehicle controller and a vehicle, so as to solve the technical problem that the vehicle charging overcurrent protection in the prior art has a high dependence on the hardware conditions of the vehicle. In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present application discloses a charging overcurrent protection method based on emergency unloading of air conditioning power, comprising the following steps: Obtain battery charging power request update signal and air conditioning power unloading occurrence time requirement; According to the air conditioner unloading occurrence time requirement and the battery charging power request update signal, determine the sequence of the air conditioner unloading occurrence time and the battery charging power request update time; When the air conditioning unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power; when the air conditioning unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold.

[0005] Preferably, when the air conditioner unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power; specifically includes: The battery management system maintains the current charging power until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system increases the current protection threshold. The current protection threshold is calculated according to the following formula: I FB2’ = k(I B2’ +I T2 ) Among them, I FB2’ represents the current current protection threshold, k represents the overcurrent protection threshold coefficient of the battery management system, I B2’ Indicates the current value of the battery management system when receiving the air conditioning power unloading event request; I T2 Indicates the current value of the air conditioner when an air conditioner power unloading event request is received.

[0006] Preferably, when the air conditioner unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold, specifically including: The battery management system maintains the current current protection threshold until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system reduces the current charging request power, which is specifically calculated according to the following formula: P BN2 =P B2’ -P T2 Where P BN2 Indicates the current charging request power; P B2’ Indicates the current charging power value of the battery management system when receiving the air conditioning power unloading event request; P T2 Indicates the operating power value of the air conditioner when an air conditioner power unloading event request is received.

[0007] Preferably, when the time requirement for air conditioning power unloading is obtained, the operating power and power requirement of the air conditioner are maintained at the current state until the air conditioning power unloading is completed.

[0008] Preferably, before obtaining the battery charging power request update signal and the air conditioner power unloading time requirement, the method further includes: Obtain the real-time power demand based on the vehicle's operating status and rechargeable power; and provide power supply equal to the real-time power demand; The battery is charged according to the power supply, and the actual power consumption value of the air conditioner, the actual current consumption value of the air conditioner, the actual charging power value of the battery and the actual current protection threshold of the battery are fed back.

[0009] In a second aspect, the present application discloses a charging overcurrent protection system based on emergency unloading of air conditioning power, comprising: An acquisition unit, used to acquire a battery charging power request update signal and an air conditioning power unloading occurrence time requirement; A judgment unit, used to judge the sequence of the air conditioner unloading occurrence time and the battery charging power request update time according to the air conditioner unloading occurrence time requirement and the battery charging power request update signal; The execution unit is used when the air conditioning unloading occurs before the battery charging power request update time, and the battery management system increases the current protection threshold and maintains the current charging power; when the air conditioning unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold.

[0010] Preferably, in the execution unit, when the air conditioner unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power, specifically including: The battery management system maintains the current charging power until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system increases the current protection threshold. The current protection threshold is calculated according to the following formula: I FB2’ = k(I B2’ +I T2 ) Among them, I FB2’ represents the current current protection threshold, k represents the overcurrent protection threshold coefficient of the battery management system, I B2’ Indicates the current value of the battery management system when receiving the air conditioning power unloading event request; I T2 Indicates the current value of the air conditioner when an air conditioner power unloading event request is received.

[0011] Preferably, in the execution unit, when the air conditioner unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold, specifically including: The battery management system maintains the current current protection threshold until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system reduces the current charging request power, which is specifically calculated according to the following formula: P BN2 =PB2’ -P T2 Where P BN2 Indicates the current charging request power; P B2’ Indicates the current charging power value of the battery management system when receiving the air conditioning power unloading event request; P T2 Indicates the operating power value of the air conditioner when an air conditioner power unloading event request is received.

[0012] In a third aspect, the present application discloses an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the above-mentioned methods for charging overcurrent protection based on emergency unloading of air conditioning power when executing the computer program.

[0013] In a fourth aspect, the present application discloses a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the charging overcurrent protection method based on emergency unloading of air conditioning power as described in any one of the above are implemented.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This application absorbs the surge current generated by air conditioning power unloading by dynamically adjusting the current protection threshold or charging power of the battery management system (BMS). It can avoid overcurrent protection without additional hardware, significantly improving charging stability and user experience. It solves the problem of battery overcurrent protection caused by emergency air conditioning power unloading during high-voltage DC fast charging, and dynamically adjusts the protection threshold or charging power of the BMS through software strategies to ensure a continuous and stable charging process. No hardware changes are required, and protection parameters can be adjusted in real time through software strategies to reduce implementation costs; effectively absorb surge currents generated by air conditioning power unloading to avoid charging interruptions; and improve user charging experience and vehicle system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the method flow of the present invention; Figure 2 A current / power curve diagram of the air conditioner power unloading before the BMS charging request is updated according to an embodiment of the present invention; Figure 3A current / power curve diagram of the air conditioner power unloading after the BMS charging request is updated according to an embodiment of the present invention; Figure 4 This is a logic flow chart of the air conditioner power unloading occurring before the BMS charging request is updated according to an embodiment of the present invention; Figure 5 This is a logic flow chart of the air conditioner power unloading occurring after the BMS charging request is updated according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings: See also Figure 1 This application relates to an electric vehicle, an extended-range vehicle, or a plug-in hybrid vehicle that is performing high-voltage DC fast charging. When an emergency unloading demand for the air-conditioning high-voltage load power occurs, the protection threshold of the battery charging current is updated in advance through a software strategy, thereby absorbing the surge current generated when the air-conditioning power is unloaded, and avoiding the problem of battery charging overcurrent protection. Specifically disclosed is a charging overcurrent protection method based on emergency unloading of air-conditioning power, comprising the following steps: S1: Obtaining the battery charging power request update signal and the air conditioning power unloading occurrence time requirement; S2: according to the air conditioner unloading occurrence time requirement and the battery charging power request update signal, determining the sequence of the air conditioner unloading occurrence time and the battery charging power request update time; S3: When the air conditioning unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power; when the air conditioning unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold.

[0021] This application absorbs the surge current generated by air conditioning power unloading by dynamically adjusting the current protection threshold or charging power of the battery management system (BMS). It can avoid overcurrent protection without additional hardware, significantly improving charging stability and user experience. It solves the problem of battery overcurrent protection caused by emergency air conditioning power unloading during high-voltage DC fast charging, and dynamically adjusts the protection threshold or charging power of the BMS through software strategies to ensure a continuous and stable charging process. No hardware changes are required, and protection parameters can be adjusted in real time through software strategies to reduce implementation costs; effectively absorb surge currents generated by air conditioning power unloading to avoid charging interruptions; and improve user charging experience and vehicle system reliability.

[0022] In some embodiments, when the air conditioner unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power; specifically including: The battery management system maintains the current charging power until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system increases the current protection threshold. The current protection threshold is calculated according to the following formula: I FB2’ = k(I B2’ +I T2 ) Among them, I FB2’ represents the current current protection threshold, k represents the overcurrent protection threshold coefficient of the battery management system, I B2’ Indicates the current value of the battery management system when receiving the air conditioning power unloading event request; I T2 Indicates the current value of the air conditioner when an air conditioner power unloading event request is received.

[0023] In some embodiments, when the air conditioner unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold, specifically including: The battery management system maintains the current current protection threshold until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system reduces the current charging request power, which is specifically calculated according to the following formula: P BN2 =P B2’ -PT2 Where P BN2 Indicates the current charging request power; P B2’ Indicates the current charging power value of the battery management system when receiving the air conditioning power unloading event request; P T2 Indicates the operating power value of the air conditioner when an air conditioner power unloading event request is received.

[0024] In some embodiments, when the time requirement for air conditioning power unloading is obtained, the operating power and power requirement of the air conditioner are maintained at the current state until the air conditioning power unloading is completed.

[0025] In some embodiments, when the air-conditioning software has a power unloading requirement, the air-conditioning software sends a power unloading event requirement and an unloading occurrence time requirement to the bus; after the battery management software receives the air-conditioning power unloading requirement event and the unloading occurrence time signal sent by the air-conditioning software, the battery management software determines whether the air-conditioning power unloading time occurs before or after the battery power request update event.

[0026] When the air conditioning power unloading time occurs before the BMS charging power request update signal: After the air conditioning software sends out a power unloading demand signal and an unloading occurrence time signal, it maintains its own operating power and power demand at the current state until the power unloading is completed; After receiving the power unloading demand signal and unloading time signal sent by the air conditioning software, the battery software 1) maintains the current charging power until the next charging request power signal is updated after the air conditioning completes power unloading; 2) increases the current current protection threshold, that is, the battery software adds its own current value when receiving the power unloading signal sent by the air conditioning software and the current value of the air conditioning, and then multiplies it by the current protection threshold coefficient as the new battery overcurrent protection threshold until the air conditioning completes power unloading, then updates the current protection threshold back to the current protection threshold when the air conditioning power unloading signal is received.

[0027] When the air conditioning power unloading time occurs after the BMS charging power request update signal: After the air conditioning software sends out a power unloading demand signal and an unloading occurrence time signal, it maintains its own operating power and power demand at the current state until the power unloading is completed; After receiving the power unloading demand signal and unloading time signal sent by the air conditioning software, the battery software 1) maintains the current current protection threshold until it is updated again when the next charging request power signal is updated after the air conditioning completes power unloading; 2) reduces the current charging power, that is, subtracts the air conditioning operating power value from its own current charging power value when receiving the power unloading signal sent by the air conditioning software, and updates again until it is updated again when the next charging request power signal is updated after the air conditioning completes power unloading.

[0028] In some embodiments, before obtaining the battery charging power request update signal and the air conditioner power unloading occurrence time requirement, the method further includes: Obtain the real-time power demand based on the vehicle's operating status and rechargeable power; and provide power supply equal to the real-time power demand; The battery is charged according to the power supply, and the actual power consumption value of the air conditioner, the actual current consumption value of the air conditioner, the actual charging power value of the battery and the actual current protection threshold of the battery are fed back.

[0029] [Example 1] The occurrence time of the air conditioner power emergency unloading △T occurs before the power request event of the BMS / TMS occurs, see Figure 2 , Figure 4 , including: The vehicle is connected to the charging pile, and the charging pile sends the current maximum available charging power P M To BMS and VCU; TMS and BMS send the required power P to VCU based on their current operating status and rechargeable power. TN1 and P BN1 ; VCU calculates the required power of BMS and TMS (P C (≤P M )=P TN1 +P BN1 ) is sent to the charging pile; The charging pile returns the available charging power P to the VCU C’ ; VCU returns the available power value of TMS and BMS; Time T1: TMS returns the actual power consumption value P T1 、Actual current consumption value I T1 ; Time T1': BMS returns the actual charging power value P B1 ', Actual current protection threshold I FB1’ = kI B1' =K(P B1' / U); Time T2: When there is an air conditioning power emergency unloading demand event E, the TMS air conditioning control software sends out an air conditioning power emergency unloading event E demand signal and the time △T when the air conditioning power emergency unloading will occur; after TMS sends out the air conditioning power emergency unloading demand event signal, it maintains the current power P T2 Continue to run until the air conditioning power unloading event F occurs; Time T2': After receiving the air conditioning power emergency unloading event E signal and the occurrence time △T: The charging power of BMS maintains the current charging power P B2’ (Under the premise of no other abnormal protection) charge until the next charging power update event requested by BMS occurs; The overcurrent protection threshold of BMS is calculated according to the formula I FB2’ =k （ I B2’ +I T2） Update until the air conditioner power emergency unloading is completed, and then update to I FB3' =K(P B2’ / U); k is the BMS overcurrent protection threshold coefficient, which is a calibrated value; Time T3: T3 = T2 + △T; Event F: TMS air conditioning software performs emergency unloading of air conditioning power and sends a signal to VCU and BMS; BMS charging power is based on the charging power P at T2' B3 =P B2’ Charging; BMS overcurrent protection threshold I FB3’ =I FB2’ ; Time T3': TMS completes emergency unloading of air conditioning power; BMS charging power maintains P B3’ =P B2’ ; BMS updates the overcurrent protection threshold, I FB3'= k(P B2’ / U); After T3' and before T4: BMS requests charging power P from VCU BN2 ; The VCU requests the charging pile to charge the power P C (≤P M )=P BN2 ; The charging pile returns the allowed charging power P C’ ; Time T4: BMS completes the next requested power update and charges according to the PB4 power value. The current protection threshold I FB4 =KP B4 / U;TMS has stopped running.

[0030] This process is a flow to prevent the TMS power discharge from generating surge current and causing BMS overcurrent protection; when the same TMS power discharge demand is generated again, this logic strategy is still executed.

[0031] The purpose of this logic strategy is to increase the current protection threshold of the BMS to a reasonable protection threshold that can absorb the surge current generated by the sudden power discharge of the TMS before the TMS discharges power, thereby avoiding overcurrent protection problems of the BMS when the TMS discharges power.

[0032] [Example 2] The occurrence time of emergency unloading of air conditioner power △T occurs after the power request event of BMS / TMS occurs, see Figure 3 , Figure 5 , including: The vehicle is connected to the charging pile, and the charging pile sends the current maximum available charging power P M至 BMS and VCU; TMS and BMS send the required power P to VCU based on their current operating status and rechargeable power. TN1 and P BN1 ; VCU calculates the required power of BMS and TMS (P C (≤P M )=P TN1 +P BN1 ) is sent to the charging pile; The charging pile returns the available charging power P to the VCU C’ ; VCU returns the available power value of TMS and BMS; Time T1: TMS returns the actual power consumption value P T1 、Actual current consumption value I T1 ; Time T1': BMS returns the actual charging power value P B1 ', Actual current protection threshold I FB1’ = kI B1' =K(P B1' / U); Time T2: When there is an air conditioning power emergency unloading demand event E, the TMS air conditioning control software sends out an air conditioning power emergency unloading event E demand signal and the time △T when the air conditioning power emergency unloading will occur; after the TMS sends out the air conditioning power emergency unloading demand event signal, it maintains the current power and continues to operate until the air conditioning power unloading event F occurs; Time T2': After receiving the air conditioner power emergency unloading event signal and the occurrence time △T: The charging power of BMS maintains the current charging power P B2’ (Under the premise of no other abnormal protection) charge until the next charging power update event requested by BMS occurs; The overcurrent protection threshold of BMS is calculated according to the formula I FB2’ =kI B2’ = k(P B2 ' / U), until the next BMS request charging power update event occurs after the TMS power unloading time F; k is the BMS overcurrent protection threshold coefficient, which is a calibration value; After T2' and before T3': TMS and BMS request the required power P from VCU TN2 and P BN2 =P B2’ -P T2 ; VCU requests charging power P from the charging pile C ; The charging pile returns the allowed charging power P C’ ; VCU returns the allowable power value P corresponding to TMS and BMS T and P B ; Time T3': The charging request power value of the BMS is updated to P B3' =P B2'- P T2 ; Overcurrent protection threshold I FB3’ =I FB2’ =kI B2’ = k(P B2 ' / U); Time T4: T4=T2+△T; Event F: TMS air conditioning software urgently unloads the air conditioning power to 0; BMS charging power is P B4 =P B3' =P B2'- P T2 The charging will continue until the next BMS request for charging power update occurs; the BMS overcurrent protection threshold I FB4 = I FB2’ ; Time T4': TMS completes emergency unloading of air conditioning power; BMS charging power is P B4’ =P B3' =P B2'- P T2 The charging will continue until the next BMS request for charging power update occurs; the BMS overcurrent protection threshold I FB4’ =I FB2’ ; At this time, TMS has stopped running.

[0033] After T4' and before T5: BMS requests charging power P from VCU BN3 ; VCU applies for charging power P from the charging pile C ; The charging pile returns the allowed charging power P C’ ; VCU returns the charging power value P allowed by BMS B5 ; Time T5: BMS completes the new requested power update P B5 ; The current protection threshold is updated according to the new charging power value I FB5 =P B5 / U; At this time, TMS has stopped running.

[0034] This process is a flow to prevent the TMS power discharge from generating surge current and causing BMS overcurrent protection; when the same TMS power discharge demand is generated again, this logic strategy is still executed.

[0035] The purpose of this logic strategy is to reduce the power value of TMS emergency discharge from the charging power value of BMS before TMS discharges power, but keep the current value of BMS current protection threshold to absorb the surge current generated by the sudden power discharge of TMS, so as to avoid the overcurrent protection problem of BMS at the TMS discharge power value. This solution can solve the battery charging overcurrent protection problem caused by the emergency unloading of air conditioning power during charging, and improve the user experience.

[0036] The present application also discloses a charging overcurrent protection system based on emergency unloading of air conditioning power, which is characterized by comprising: An acquisition unit, used to acquire a battery charging power request update signal and an air conditioning power unloading occurrence time requirement; A judgment unit, used to judge the sequence of the air conditioner unloading occurrence time and the battery charging power request update time according to the air conditioner unloading occurrence time requirement and the battery charging power request update signal; The execution unit is used when the air conditioning unloading occurs before the battery charging power request update time, and the battery management system increases the current protection threshold and maintains the current charging power; when the air conditioning unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold.

[0037] In some embodiments, in the execution unit, when the air conditioner unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power, specifically including: The battery management system maintains the current charging power until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system increases the current protection threshold. The current protection threshold is calculated according to the following formula: I FB2’ = k(I B2’ +I T2 ) Among them, I FB2’ represents the current current protection threshold, k represents the overcurrent protection threshold coefficient of the battery management system, I B2’ Indicates the current value of the battery management system when receiving the air conditioning power unloading event request; I T2 Indicates the current value of the air conditioner when an air conditioner power unloading event request is received.

[0038] In some embodiments, in the execution unit, when the air conditioner unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold, specifically including: The battery management system maintains the current current protection threshold until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system reduces the current charging request power, which is specifically calculated according to the following formula: P BN2 =P B2’ -P T2 Where P BN2 Indicates the current charging request power; P B2’ Indicates the current charging power value of the battery management system when receiving the air conditioning power unloading event request; P T2 Indicates the operating power value of the air conditioner when an air conditioner power unloading event request is received.

[0039] The present invention also discloses an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the charging overcurrent protection method based on emergency unloading of air conditioning power as described above are implemented.

[0040] The present invention also discloses a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the charging overcurrent protection method based on emergency unloading of air conditioning power as described in any one of the above are implemented.

[0041] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0042] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0043] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0044] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A charging overcurrent protection method based on emergency unloading of air conditioning power, characterized in that: The following steps are involved: Obtain battery charging power request update signal and air conditioning power unloading occurrence time requirement; According to the air conditioner unloading occurrence time requirement and the battery charging power request update signal, determine the sequence of the air conditioner unloading occurrence time and the battery charging power request update time; When the air conditioning unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power; when the air conditioning unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold.

2. A charging overcurrent protection method based on emergency unloading of air conditioning power according to claim 1, characterized in that: When the air conditioner unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power; specifically including: The battery management system maintains the current charging power until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system increases the current protection threshold. The current protection threshold is calculated according to the following formula: I FB2’ =k(I B2’ +I T2 ) Among them, I FB2’ represents the current current protection threshold, k represents the overcurrent protection threshold coefficient of the battery management system, I B2’ Indicates the current value of the battery management system when receiving the air conditioning power unloading event request; I T2 Indicates the current value of the air conditioner when an air conditioner power unloading event request is received.

3. A charging overcurrent protection method based on emergency unloading of air conditioning power according to claim 1, characterized in that: When the air conditioner unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold, including: The battery management system maintains the current current protection threshold until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system reduces the current charging request power, which is specifically calculated according to the following formula: P BN2 =P B2’ -P T2 Where P BN2 Indicates the current charging request power; P B2’ Indicates the current charging power value of the battery management system when receiving the air conditioning power unloading event request; P T2 Indicates the operating power value of the air conditioner when an air conditioner power unloading event request is received.

4. A charging overcurrent protection method based on emergency unloading of air conditioning power according to claim 1, characterized in that: When the time requirement for air conditioning power unloading is obtained, the operating power and power requirement of the air conditioner are maintained at the current state until the air conditioning power unloading is completed.

5. The charging overcurrent protection method based on emergency unloading of air conditioning power according to claim 1 is characterized in that: Before obtaining the battery charging power request update signal and the air conditioner power unloading occurrence time requirement, the method further includes: Obtain the real-time power demand based on the vehicle's operating status and rechargeable power; and provide power supply equal to the real-time power demand; The battery is charged according to the power supply, and the actual power consumption value of the air conditioner, the actual current consumption value of the air conditioner, the actual charging power value of the battery and the actual current protection threshold of the battery are fed back.

6. A charging overcurrent protection system based on emergency unloading of air conditioning power, characterized in that: include: An acquisition unit, used to acquire a battery charging power request update signal and an air conditioning power unloading occurrence time requirement; A judgment unit, used to judge the sequence of the air conditioner unloading occurrence time and the battery charging power request update time according to the air conditioner unloading occurrence time requirement and the battery charging power request update signal; The execution unit is used when the air conditioning unloading occurs before the battery charging power request update time, and the battery management system increases the current protection threshold and maintains the current charging power; when the air conditioning unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold.

7. A charging overcurrent protection system based on emergency unloading of air conditioning power according to claim 6, characterized in that: In the execution unit, when the air conditioner unloading occurs before the battery charging power request update time, the battery management system increases the current protection threshold and maintains the current charging power, specifically including: The battery management system maintains the current charging power until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system increases the current protection threshold. The current protection threshold is calculated according to the following formula: I FB2’ =k(I B2’ +I T2 ) Among them, I FB2’ represents the current current protection threshold, k represents the overcurrent protection threshold coefficient of the battery management system, I B2’ Indicates the current value of the battery management system when receiving the air conditioning power unloading event request; I T2 Indicates the current value of the air conditioner when an air conditioner power unloading event request is received.

8. A charging overcurrent protection system based on emergency unloading of air conditioning power according to claim 6, characterized in that: In the execution unit, when the air conditioner unloading occurs after the battery charging power request update time, the battery management system reduces the charging request power and maintains the current current protection threshold, specifically including: The battery management system maintains the current current protection threshold until the next charging request power signal is updated after the air conditioner completes power unloading; The battery management system reduces the current charging request power, which is specifically calculated according to the following formula: P BN2 =P B2’ -P T2 Where P BN2 Indicates the current charging request power; P B2’ Indicates the current charging power value of the battery management system when receiving the air conditioning power unloading event request; P T2 Indicates the operating power value of the air conditioner when an air conditioner power unloading event request is received.

9. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the charging overcurrent protection method based on emergency unloading of air conditioning power as described in any one of claims 1 to 5 when executing the computer program.

10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the charging overcurrent protection method based on emergency unloading of air conditioning power as described in any one of claims 1 to 5.

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