Vehicle discharge protection method and device and charging pile

Abstract

The invention relates to the technical field of vehicles, and discloses a vehicle discharge protection method and device and a charging pile. The method includes determining a battery capacity of a vehicle battery; determining a target discharge capacity according to the battery capacity and the first preset SOC variation; under the condition that the discharge capacity of the charging pile for discharging the vehicle battery reaches the target discharge capacity, the SOC variation of the battery management system is determined according to the SOC of the battery management system of the vehicle; determining whether the battery management system has a fault according to the SOC variation and a first preset SOC variation; and under the condition that the battery management system has a fault, performing reduction control on the discharge power of the charging pile according to the SOC variation. Through the method, the abnormal condition of the vehicle end battery management system can be recognized in real time, and the battery is prevented from being damaged.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a vehicle discharge protection method, device and charging pile. Background Technology

[0002] Bidirectional charging stations rely on information exchange with the vehicle's battery management system (BMS) when providing power to the grid or loads from the vehicle's battery. However, during reverse discharge, the BMS may malfunction. Continuing to discharge the battery under these conditions could lead to depletion or damage, affecting the vehicle's normal operation and battery life. Current technologies address this by manually observing fault information displayed on the vehicle's infotainment system and stopping discharge upon detection of anomalies. However, this method suffers from poor real-time performance and reliability, making it difficult to effectively prevent battery damage. Summary of the Invention

[0003] The embodiments of this application aim to at least partially solve one of the technical problems in the related art. To this end, the embodiments of this application propose a vehicle discharge protection method, device, and charging pile.

[0004] An embodiment of this application provides a vehicle discharge protection method, the method comprising: determining the battery capacity of a vehicle battery; determining a target discharge amount based on the battery capacity and a first preset SOC change; when the discharge amount of the vehicle battery discharged by the charging pile reaches the target discharge amount, determining the SOC change of the battery management system based on the SOC of the vehicle's battery management system; determining whether the battery management system has malfunctioned based on the SOC change and the first preset SOC change; and, in the case of a battery management system malfunction, reducing the discharge power of the charging pile based on the SOC change.

[0005] In some embodiments, determining whether a battery management system has malfunctioned based on the SOC change and a first preset SOC change includes: determining a target SOC change based on a preset protection factor and a first preset SOC change, wherein the preset protection factor is determined based on at least one of the current ambient temperature and the current SOC of the battery management system; and determining that the battery management system has malfunctioned if the SOC change is less than the target SOC change.

[0006] In some embodiments, the preset protection factor is negatively correlated with the current ambient temperature and the current SOC, respectively.

[0007] In some embodiments, the SOC change controls the reduction of the charging pile's discharge power, including: reducing the charging pile's discharge power when the SOC change is greater than a preset change but less than a target SOC change; or reducing the charging pile's discharge power to 0 when the SOC change is less than or equal to the preset change.

[0008] In some embodiments, after reducing the discharge power of the charging pile to 0, the method further includes: controlling the charging pile to charge the vehicle battery until the vehicle battery's charge reaches the charge value corresponding to the target discharge amount.

[0009] In some embodiments, determining the battery capacity of a vehicle battery includes: obtaining the current battery capacity of the vehicle battery; and determining the battery capacity based on the current battery capacity and the current ambient temperature.

[0010] In some embodiments, determining the battery capacity of a vehicle battery includes: controlling a charging pile according to a preset control method, wherein the preset control method is to control the charging pile to charge the vehicle battery according to a preset charging current, or to control the charging pile to discharge the vehicle battery according to a preset discharging current; determining the change in battery charge according to the preset control method when the change in SOC of the battery management system reaches a second preset SOC change; determining the current battery capacity of the vehicle battery based on the change in battery charge and the second preset SOC change; and determining the battery capacity based on the current battery capacity and the current ambient temperature.

[0011] In some embodiments, determining the battery capacity based on the current battery capacity and the current ambient temperature includes: using the current battery capacity as the battery capacity when the current ambient temperature is greater than or equal to a first preset temperature threshold; or using the minimum of the historical battery capacity and the current battery capacity of the vehicle battery as the battery capacity when the current ambient temperature is less than the first preset temperature threshold.

[0012] In some embodiments, determining the SOC change of the battery management system based on the SOC of the vehicle's battery management system includes: obtaining a first SOC of the battery management system; determining the discharge amount of the charging pile discharging the vehicle battery based on the discharge current of the charging pile; obtaining a second SOC of the battery management system when the discharge amount of the charging pile discharging the vehicle battery reaches a target discharge amount; and determining the SOC change based on the difference between the first SOC and the second SOC.

[0013] In some embodiments, the method further includes: reducing the discharge power of the charging pile when the current ambient temperature is less than a second preset temperature threshold or the current SOC of the battery management system is less than a preset SOC threshold.

[0014] An embodiment of this application provides a charging pile, including a memory, a processor, and a vehicle discharge protection program stored in the memory and executable on the processor. When the processor executes the vehicle discharge protection program, it implements the steps of the method of any of the above embodiments.

[0015] Embodiments of this application provide a vehicle discharge protection device, comprising: a first determining module for determining the battery capacity of a vehicle battery; a second determining module for determining a target discharge amount based on the battery capacity and a first preset SOC change amount; a third determining module for determining the SOC change amount of the battery management system based on the SOC of the vehicle's battery management system when the discharge amount from the charging pile to the vehicle battery reaches the target discharge amount; a fourth determining module for determining whether the battery management system has malfunctioned based on the SOC change amount and the first preset SOC change amount; and a control module for reducing the discharge power of the charging pile based on the SOC change amount when the battery management system malfunctions.

[0016] An embodiment of this application provides a charging pile, which includes: a memory, and one or more processors communicatively connected to the memory; the memory stores instructions executable by one or more processors, which are executed by one or more processors to cause the one or more processors to implement the steps of the method of any of the above embodiments.

[0017] Embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method of any of the above embodiments.

[0018] Embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the steps of the method according to any of the above embodiments.

[0019] As can be seen, in the solution provided in this application, the system can identify whether there is an anomaly in the vehicle-side BMS in real time based on the actual SOC change. If an anomaly in the vehicle-side BMS is detected early, the discharge power of the charging pile can be reduced, thereby effectively avoiding the risk of over-discharge of the vehicle caused by the abnormality of the vehicle-side BMS, improving the safety and reliability of the vehicle battery during the charging and discharging process, and ensuring the service life of the battery. Attached Figure Description

[0020] Figure 1 A schematic flowchart illustrating a vehicle discharge protection method provided in an embodiment of this application; Figure 2 This is a schematic diagram illustrating the interaction between a vehicle and a charging pile according to an embodiment of this application. Figure 3 This is a schematic diagram of a discharge protection process provided in an embodiment of this application; Figure 4 This is a schematic diagram of the charging and discharging energy flow provided in an embodiment of this application; Figure 5 A schematic diagram of a vehicle discharge protection device provided in an embodiment of this application; Figure 6 A block diagram of a charging pile provided in an embodiment of this application. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0022] During the process of the charging station discharging energy from the vehicle's battery in reverse, the vehicle's BMS (Battery Management System) may malfunction. If the vehicle battery continues to be discharged at this time, it may cause the battery to be depleted or damaged, thereby affecting the normal use of the user's vehicle and the battery's lifespan.

[0023] Therefore, during the discharge process, the charging station needs to detect any abnormalities in the vehicle's BMS in real time, and slow down or stop the discharge to avoid damaging the vehicle's battery or affecting the normal use of the vehicle.

[0024] However, traditional methods for judging BMS anomalies in vehicles usually rely on manual intervention. It requires manual observation of the fault codes displayed on the vehicle's infotainment system to identify whether the BMS is abnormal. After the BMS anomaly is detected, manual intervention is required to stop the discharge process. This method has poor real-time performance and reliability.

[0025] In view of this, this application provides a vehicle discharge protection method that can identify abnormalities in the vehicle-side BMS in real time based on changes in the vehicle's SOC (State of Charge, percentage of remaining battery charge) during vehicle discharge, thereby preventing battery damage.

[0026] Figure 1 This is a schematic flowchart of a vehicle discharge protection method provided in an embodiment of this application.

[0027] like Figure 1 As shown, the vehicle discharge protection method provided in this application includes steps S110-S150.

[0028] Step S110: Determine the battery capacity of the vehicle battery.

[0029] It should be noted that the vehicle discharge protection method in this embodiment is applied to charging piles. When the charging pile is connected to the vehicle, the charging pile and the vehicle's BMS will exchange charging and discharging parameters. The vehicle's BMS can inform the charging pile of its own charging and discharging capacity parameters, including the battery capacity. If the battery capacity cannot be obtained during the exchange of charging and discharging parameters, the charging pile can also calculate the battery capacity in reverse based on the energy value required for a certain range of change in the vehicle's SOC during charging and discharging.

[0030] Step S120: Determine the target discharge amount based on the battery capacity and the first preset SOC change.

[0031] The amount of discharge required to achieve the first preset change in the vehicle's State of Charge (SOC), i.e., the target discharge amount, can be calculated based on the battery capacity. The target discharge amount can be calculated using the following formula:

[0032] in, For the target discharge quantity, For battery capacity, This represents the first preset SOC change.

[0033] Step S130: When the discharge amount of the vehicle battery discharged by the charging pile reaches the target discharge amount, determine the change in SOC of the battery management system based on the SOC of the vehicle's battery management system.

[0034] When a charging station discharges a vehicle battery, if the discharge amount has reached the target discharge amount, the charging station can determine the actual change in SOC based on the difference between the SOC sent by the vehicle's BMS at the current time and the SOC sent by the vehicle's BMS at the time when the discharge amount begins to accumulate.

[0035] Step S140: Determine whether the battery management system has malfunctioned based on the change in SOC and the first preset change in SOC.

[0036] Specifically, when the vehicle's BMS is functioning normally, the change in SOC is the same as the first preset SOC change. However, in real-world applications, the vehicle itself consumes some power (e.g., the vehicle's air conditioning system consumes power), so the change in SOC will be greater than or equal to the first preset SOC change. When the vehicle's BMS malfunctions, the SOC sent by the BMS differs from the actual SOC, and therefore the trend of SOC change also differs from the actual SOC change trend. Thus, when the change in SOC is less than the first preset SOC change, it can be determined that the battery management system has malfunctioned.

[0037] In step S150, if the battery management system malfunctions, the discharge power of the charging pile is reduced based on the change in SOC.

[0038] If the battery management system malfunctions, the severity of the BMS abnormality can be determined based on the change in SOC. Depending on the severity of the BMS abnormality, the discharge power of the charging station can be reduced, slowing down or stopping the discharge from the vehicle.

[0039] Optionally, if the battery management system does not malfunction, the accumulated discharge amount, i.e. the amount of discharge from the charging station to the vehicle battery, will be cleared in order to perform the next round of testing on the BMS.

[0040] As can be seen, in the solution provided in this application, the charging pile can identify whether there is an abnormality in the vehicle-side BMS in real time based on the actual SOC change. If an abnormality in the vehicle-side BMS is detected early, the discharge power of the charging pile can be reduced, thereby effectively avoiding the risk of vehicle over-discharge caused by abnormality in the vehicle-side BMS, improving the safety and reliability of the vehicle battery during the charging and discharging process, and ensuring the battery's service life.

[0041] Figure 2 This is a schematic diagram illustrating the interaction process between a vehicle and a charging station, as provided in one embodiment of this application.

[0042] There are various communication standards between charging piles and vehicles, mainly including European standards, American standards, and Chinese standards, and they mainly use PLC (Programmable Logic Controller) or CAN (Controller Area Network) communication to achieve connection.

[0043] like Figure 2 As shown, the vehicle-charging station interaction process can be roughly divided into four stages: authentication to start charging, interaction of charging and discharging parameters, preparation for charging and discharging, charging / discharging in progress, and charging / discharging completed. After the charging gun is inserted into the charging station, the user starts charging via an app, card swipe, or other methods to complete authentication. Next, the charging and discharging parameter interaction stage begins. At this stage, the vehicle and the charging station inform each other of their charging and discharging capacity parameters. Some vehicles will directly send their battery capacity information via messages. If the battery capacity cannot be obtained at this stage, the charging station can calculate the vehicle's battery capacity by inversely calculating the energy required for a certain change in the vehicle's State of Charge (SOC).

[0044] After confirming the charging and discharging parameters, both parties will perform pre-charging power measurement and other preparatory actions, such as insulation testing and pre-charging, before entering the energy transfer phase. During charging / discharging, the vehicle will send real-time SOC and charging / discharging request current. For the discharging process, the charging station will determine whether the vehicle's SOC drop is normal based on the known battery capacity and real-time cumulative discharge amount, thereby monitoring for any abnormalities in the BMS; if an abnormality is detected, the discharge power will be reduced or the discharge will be stopped. Finally, at the end of charging and discharging, both parties will turn off power output, ending the charging / discharging session.

[0045] Figure 3 This is a schematic diagram of a discharge protection process provided in an embodiment of this application.

[0046] like Figure 3 As shown, after the charging gun is plugged in and authentication is completed to start charging, the charging station will determine whether the vehicle's battery capacity has been obtained during the charging and discharging parameter interaction phase. If not, the battery capacity needs to be calculated through a period of charging and discharging. If the battery capacity is obtained or calculated, the next step is to calculate the amount of electricity required to change the vehicle's SOC to a certain value.

[0047] Subsequently, the charging station begins accumulating real-time discharge. When the actual discharge reaches the calculated required amount of electricity, it determines whether the change in the vehicle's State of Charge (SOC) meets expectations. If it does, the accumulated electricity is cleared, and a new round of testing begins. If it does not meet expectations, measures such as slowing down the discharge, ending the discharge, or switching to charging are taken to prevent the vehicle's battery from running out of power.

[0048] The following will combine Figure 1-3 This application provides a detailed description of the vehicle discharge protection method provided.

[0049] In some embodiments, determining whether a battery management system has malfunctioned based on the SOC change and a first preset SOC change includes: determining a target SOC change based on a preset protection factor and a first preset SOC change, wherein the preset protection factor is determined based on at least one of the current ambient temperature and the current SOC of the battery management system; and determining that the battery management system has malfunctioned if the SOC change is less than the target SOC change.

[0050] Specifically, based on the current ambient temperature Determine a preset protection factor based on at least one of the current SOC of the battery management system. Among them, the preset protection factor ≥1, preset protection factor It can be used to adjust the sensitivity of the discharge protection response. When the temperature decreases or the vehicle's battery SOC decreases, the preset protection factor is adjusted. It will dynamically decrease to improve the protection response speed. Based on the preset protection coefficient. and the change in the first preset SOC Determine the target SOC change When the change in SOC is less than the target change in SOC, that is:

[0051] It can be determined that the battery management system has malfunctioned, which in turn slows down or stops the discharge from the vehicle.

[0052] In some embodiments, a preset protection factor is used. Relative to the current ambient temperature It is negatively correlated with the current SOC.

[0053] In the embodiments provided in this application, a preset protection coefficient adapted to temperature and battery state is introduced, which can effectively eliminate interference from normal SOC changes caused by temperature or battery state fluctuations, improve the accuracy and reliability of fault diagnosis, thereby avoiding misjudgment caused by environmental factors and ensuring the accuracy of fault identification of the battery management system.

[0054] In some embodiments, the SOC change controls the reduction of the charging pile's discharge power, including: reducing the charging pile's discharge power when the SOC change is greater than a preset change but less than a target SOC change; or reducing the charging pile's discharge power to 0 when the SOC change is less than or equal to the preset change.

[0055] For example, in scenarios where the SOC change is greater than a preset change but less than a target SOC change, the charging station slows down the discharge rate to bring the actual SOC change trend back towards the target SOC change. In scenarios where the SOC change is less than or equal to the preset change, if the actual SOC change is too small or reverses, indicating a serious BMS malfunction or a risk of battery damage, the charging station will directly stop discharging, reducing the discharge power to zero.

[0056] Figure 4 This is a schematic diagram of the charging and discharging energy flow provided in an embodiment of this application.

[0057] In some embodiments, after reducing the discharge power of the charging pile to 0, the method further includes: controlling the charging pile to charge the vehicle battery until the charge amount of the vehicle battery reaches the charge value corresponding to the target discharge amount.

[0058] exist Figure 4In the scenarios shown, where the charging station is connected to the grid with a PCS (Power Conversion System) or a battery pack, the charging station will automatically switch from discharging to charging once the discharge power is reduced to 0. When the charging station detects a BMS fault, it starts purchasing power from the energy storage or the grid to charge the vehicle, returning the amount of electricity corresponding to the target discharge level to the vehicle's battery through the charging process. This attempts to restore the vehicle's battery from its abnormal state and prevent the vehicle from being affected by a depleted battery.

[0059] In some embodiments, determining the battery capacity of a vehicle battery includes: obtaining the current battery capacity of the vehicle battery; and determining the battery capacity based on the current battery capacity and the current ambient temperature.

[0060] After authentication and initiation of the charging session, the charging station first attempts to directly obtain the vehicle's current battery capacity during the charging and discharging parameter interaction phase. If the interaction is successful, the charging station can directly obtain the vehicle's current battery capacity. If the capacity information cannot be obtained directly, the charging station will initiate an active estimation process to estimate the vehicle's current battery capacity. The specific estimation method will be described in detail below. However, regardless of whether the current battery capacity is obtained directly or actively calculated, the charging station will further adjust the capacity value based on the current ambient temperature to ultimately determine a more accurate battery capacity under the current ambient temperature.

[0061] In some embodiments, determining the battery capacity of a vehicle battery includes: controlling a charging pile according to a preset control method, wherein the preset control method is to control the charging pile to charge the vehicle battery according to a preset charging current, or to control the charging pile to discharge the vehicle battery according to a preset discharging current; determining the change in battery charge according to the preset control method when the change in SOC of the battery management system reaches a second preset SOC change; determining the current battery capacity of the vehicle battery based on the change in battery charge and the second preset SOC change; and determining the battery capacity based on the current battery capacity and the current ambient temperature.

[0062] In addition to obtaining the vehicle's battery capacity from the messages sent by the vehicle, the charging station can also determine the current battery capacity of the vehicle based on the change in charge level and a second preset SOC change level before the discharge protection takes effect. Specifically, it can control the charging station to charge the vehicle battery based on a preset charging current, or control the charging station to discharge the vehicle battery based on a preset discharging current, and calculate the SOC change level cumulatively until it reaches the second preset SOC change level. In this case, based on the second preset SOC change amount and the change in SOC second preset SOC amount Required change in electricity The current battery capacity of the vehicle is calculated using the following formula:

[0063] Because a car's real-time battery level is affected by factors such as ambient temperature, it will decrease when the ambient temperature is below a certain level. At that time, the minimum value between the battery capacity obtained from the vehicle message and the amount of electricity obtained through the above calculation formula can be taken as the maximum battery capacity of the vehicle. .

[0064] In some embodiments, the battery capacity is determined based on the current battery capacity and the current ambient temperature. Specifically, at the current ambient temperature... Greater than or equal to the first preset temperature threshold In the case that, The current battery capacity obtained from the vehicle message or the above calculation formula is taken as the vehicle's battery capacity; or the current ambient temperature... Less than the first preset temperature threshold In the case that, This indicates that the ambient temperature is too low, which may cause abnormalities in the vehicle battery. Therefore, the minimum value between the vehicle battery's historical battery capacity and the current battery capacity is taken as the battery capacity.

[0065] In some embodiments, determining the SOC change of the battery management system based on the SOC of the vehicle's battery management system includes: obtaining a first SOC of the battery management system; determining the discharge amount of the charging pile discharging the vehicle battery based on the discharge current of the charging pile; obtaining a second SOC of the battery management system when the discharge amount of the charging pile discharging the vehicle battery reaches a target discharge amount; and determining the SOC change based on the difference between the first SOC and the second SOC.

[0066] For example, the first SOC of the battery management system is the SOC value sent by the vehicle at the moment when the battery starts accumulating charge; it can be based on the real-time discharge current. The real-time discharge quantity is obtained by integration:

[0067] Where t represents the relative time from the start of accumulating electricity to the current moment.

[0068] The vehicle battery is discharged to the target discharge level at the charging station. In the case that, when At that time, the change in SOC is determined based on the difference between the first SOC and the second SOC. .

[0069] In some embodiments, the method further includes: reducing the discharge power of the charging pile when the current ambient temperature is less than a second preset temperature threshold or the current SOC of the battery management system is less than a preset SOC threshold.

[0070] Understandably, when the current ambient temperature is below the second preset temperature threshold, it indicates that the ambient temperature is too low. If the vehicle battery continues to discharge under these conditions, it could easily damage the battery. Therefore, the discharge power of the charging station is reduced to slow down the internal battery wear at low temperatures by decreasing the discharge rate. When the current SOC of the battery management system is below the preset SOC threshold, it indicates that the vehicle battery's charge is already low. If discharge continues, the vehicle battery will become depleted. Therefore, the charging station will reduce its discharge power.

[0071] To better understand this application, two complete embodiments are provided to describe the solution provided in this application in detail.

[0072] This application provides a method for... Figure 2 In the embodiment shown, the vehicle battery capacity cannot be obtained during the charging and discharging parameter interaction phase. The SOC change amounts are respectively... , ; and in Figure 4 The system shown allows for fault recovery by switching from discharge to charge.

[0073] First, the charging station authenticates and initiates a charging session. During the charge / discharge parameter exchange phase, since the vehicle's battery capacity could not be obtained, the charging station then enters the charging phase. In this phase, the charging station charges based on the charging current. The vehicle's charging amount is calculated cumulatively. Until the vehicle's SOC is changed. To obtain the current charging amount. The battery capacity can be calculated from this:

[0074] Continue to receive vehicle SOC decline Required power Start monitoring and record the vehicle's State of Charge (SOC) at this time. Based on current Real-time integration to obtain discharge amount:

[0075] when At this time, the vehicle's SOC is still [value missing]. The change in SOC transmitted by the vehicle end during discharge is calculated as follows: ,because If the vehicle-side BMS is determined to be malfunctioning, and the State of Charge (SOC) remains unchanged, then discharging must be stopped immediately. At this point, the amount of charge discharged from the vehicle-side... All the energy is stored in the energy storage battery, and the charging station starts the charging process until the battery is fully charged. This step aims to attempt to recover from any potential faults and ensure that the previous discharge behavior does not cause the vehicle battery to over-discharge and become depleted, thereby ensuring the normal use of the vehicle in the future.

[0076] This application also provides a method for... Figure 2 The illustrated embodiment of obtaining vehicle battery capacity through the charging and discharging parameter interaction stage includes the SOC change amount. , .

[0077] Similarly, the system authenticates and initiates the charging session. During the charge / discharge parameter exchange phase, the system obtains the battery capacity sent by the vehicle. Then the vehicle's SOC decrease was obtained. Required power .

[0078] Subsequently, the control process enters the discharge monitoring phase. The charging station records the vehicle's SOC at this time as follows: Based on current Real-time integration to obtain discharge amount:

[0079] when At that time, the vehicle's SOC is obtained. The change in SOC transmitted by the vehicle end during discharge is calculated as follows: Since the SOC at the vehicle end is at this time... Within a safe range, and If the rate of change of SOC does not exceed the set safety tolerance, the system determines that the current discharge process can continue.

[0080] Figure 5 This is a schematic diagram of a vehicle discharge protection device provided in an embodiment of this application.

[0081] Embodiments of this application provide a vehicle discharge protection device 500, comprising: The first determining module 510 is used to determine the battery capacity of the vehicle battery.

[0082] The second determining module 520 is used to determine the target discharge amount based on the battery capacity and the first preset SOC change.

[0083] The third determining module 530 is used to determine the change in SOC of the battery management system based on the SOC of the vehicle's battery management system when the discharge amount of the vehicle battery discharged by the charging pile reaches the target discharge amount.

[0084] The fourth determining module 540 is used to determine whether the battery management system has malfunctioned based on the change in SOC and the first preset change in SOC.

[0085] The control module 550 is used to reduce the discharge power of the charging pile based on the change in SOC in the event of a failure in the battery management system.

[0086] In some embodiments, the fourth determining module 540 is further configured to: determine a target SOC change based on a preset protection factor and a first preset SOC change, wherein the preset protection factor is determined based on at least one of the current ambient temperature and the current SOC of the battery management system; and determine that the battery management system has malfunctioned if the SOC change is less than the target SOC change.

[0087] In some embodiments, the control module 550 is further configured to: reduce the discharge power of the charging pile when the change in SOC is greater than a preset change but less than a target change in SOC; or reduce the discharge power of the charging pile to 0 when the change in SOC is less than or equal to a preset change.

[0088] In some embodiments, the control module 550 is further configured to: control the charging pile to charge the vehicle battery until the vehicle battery reaches the charge value corresponding to the target discharge amount.

[0089] In some embodiments, the first determining module 510 is further configured to: obtain the current battery capacity of the vehicle battery; and determine the battery capacity based on the current battery capacity and the current ambient temperature.

[0090] In some embodiments, the first determining module 510 is further configured to: control the charging pile according to a preset control method, wherein the preset control method is to control the charging pile to charge the vehicle battery according to a preset charging current, or to control the charging pile to discharge the vehicle battery according to a preset discharging current; determine the change in the amount of charge of the vehicle battery according to the preset control method when the change in the SOC of the battery management system reaches a second preset change in SOC; determine the current battery capacity of the vehicle battery according to the change in the amount of charge and the second preset change in SOC; and determine the battery capacity according to the current battery capacity and the current ambient temperature.

[0091] In some embodiments, the first determining module 510 is further configured to: take the current battery capacity as the battery capacity when the current ambient temperature is greater than or equal to a first preset temperature threshold; or take the minimum value between the historical battery capacity and the current battery capacity of the vehicle battery as the battery capacity when the current ambient temperature is less than the first preset temperature threshold.

[0092] In some embodiments, the third determining module 530 is further configured to: obtain a first SOC of the battery management system; determine the discharge amount of the charging pile to the vehicle battery based on the discharge current of the charging pile; obtain a second SOC of the battery management system when the discharge amount of the charging pile to the vehicle battery reaches the target discharge amount; and determine the SOC change amount based on the difference between the first SOC and the second SOC.

[0093] In some embodiments, the control module 550 is further configured to: reduce the discharge power of the charging pile when the current ambient temperature is less than a second preset temperature threshold, or when the current SOC of the battery management system is less than a preset SOC threshold.

[0094] It is understood that for a detailed description of the vehicle discharge protection device 500, please refer to the description of the vehicle discharge protection method above.

[0095] This application provides a charging pile, including a memory, a processor, and a vehicle discharge protection program stored in the memory and executable on the processor. When the processor executes the vehicle discharge protection program, it implements the steps of the method in any of the above embodiments.

[0096] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method in any of the above embodiments.

[0097] This application provides a computer program product that includes instructions that, when executed by a processor of a computer device, enable the computer device to perform the steps of the method described in any of the above embodiments.

[0098] Figure 6 A block diagram of a charging pile provided in an embodiment of this application.

[0099] This application provides a charging pile, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the method in any of the above embodiments.

[0100] like Figure 6 As shown, for ease of understanding, an embodiment of this application illustrates a specific charging pile 600.

[0101] like Figure 6 As shown, the charging station 600 includes a computing unit 601, which can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. The RAM 603 may also store various programs and data required for the operation of the charging station 600. The computing unit 601, ROM 602, and RAM 603 are interconnected via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0102] Multiple components in the charging station 600 are connected to the I / O interface 605. These components include: an input unit 606, such as a keyboard or mouse; an output unit 607, such as various types of displays or speakers; a storage unit 608, such as a disk or optical disk; and a communication unit 609, such as a network interface card (NIC), a modem, or a wireless transceiver. The communication unit 609 allows the charging station 600 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0103] The computing unit 601 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 601 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 601 performs the various methods described above. For example, in some embodiments, any one or more of the methods described above can be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 608. In some embodiments, part or all of the computer program can be loaded and / or installed on the charging pile 600 via ROM 602 and / or communication unit 609. When the computer program is loaded into RAM 603 and executed by the computing unit 601, one or more steps of any one or more of the methods described above can be performed. Alternatively, in other embodiments, the computing unit 601 can be configured to perform any one or more of the methods described above by any other suitable means (e.g., by means of firmware).

[0104] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this application, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

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

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

[0107] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0108] Furthermore, the terms "first," "second," etc., used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this application can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this application, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly and specifically defined in the embodiments.

[0109] In this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0110] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Claims

1. A vehicle discharge protection method, characterized in that, include: Determine the battery capacity of the vehicle; The target discharge amount is determined based on the battery capacity and the first preset SOC change. When the discharge amount of the vehicle battery discharged by the charging pile reaches the target discharge amount, the change in SOC of the battery management system is determined based on the SOC of the vehicle's battery management system. Determine whether the battery management system has malfunctioned based on the SOC change and the first preset SOC change. In the event of a malfunction in the battery management system, the discharge power of the charging pile is reduced based on the change in SOC.

2. The method according to claim 1, characterized in that, Determining whether the battery management system has malfunctioned based on the SOC change and the first preset SOC change includes: The target SOC change is determined based on a preset protection factor and the first preset SOC change, wherein the preset protection factor is determined based on at least one of the current ambient temperature and the current SOC of the battery management system. If the change in SOC is less than the target change in SOC, it is determined that the battery management system has malfunctioned.

3. The method according to claim 2, characterized in that, The discharge power of the charging pile is reduced based on the change in SOC, including: If the change in SOC is greater than a preset change but less than the target change in SOC, reduce the discharge power of the charging pile; or If the change in SOC is less than or equal to the preset change, the discharge power of the charging pile will be reduced to 0.

4. The method according to claim 3, characterized in that, After reducing the discharge power of the charging pile to 0, the method further includes: The charging pile is controlled to charge the vehicle battery until the vehicle battery reaches the charge value corresponding to the target discharge amount.

5. The method according to claim 1, characterized in that, Determining the battery capacity of the vehicle includes: Obtain the current battery capacity of the vehicle battery; The battery capacity is determined based on the current battery capacity and the current ambient temperature.

6. The method according to claim 1, characterized in that, Determining the battery capacity of the vehicle includes: The charging pile is controlled according to a preset control method, wherein the preset control method is to control the charging pile to charge the vehicle battery according to a preset charging current, or to control the charging pile to discharge the vehicle battery according to a preset discharging current. When the SOC change of the battery management system reaches the second preset SOC change, the change in the battery charge of the vehicle is determined according to the preset control method. The current battery capacity of the vehicle battery is determined based on the change in charge and the second preset change in SOC. The battery capacity is determined based on the current battery capacity and the current ambient temperature.

7. The method according to claim 5 or 6, characterized in that, Determining the battery capacity based on the current battery capacity and the current ambient temperature includes: If the current ambient temperature is greater than or equal to a first preset temperature threshold, the current battery capacity will be used as the battery capacity; or If the current ambient temperature is lower than the first preset temperature threshold, the minimum value between the historical battery capacity and the current battery capacity of the vehicle battery shall be used as the battery capacity.

8. The method according to claim 1, characterized in that, Determining the SOC change of the battery management system based on the SOC of the vehicle's battery management system includes: Obtain the first SOC of the battery management system; The amount of discharge that the charging pile performs on the vehicle battery is determined based on the discharge current of the charging pile. When the discharge amount of the vehicle battery discharged by the charging pile reaches the target discharge amount, the second SOC of the battery management system is obtained; The change in SOC is determined based on the difference between the first SOC and the second SOC.

9. A charging pile, characterized in that, The system includes a memory, a processor, and a vehicle discharge protection program stored in the memory and executable on the processor. When the processor executes the vehicle discharge protection program, it implements the vehicle discharge protection method according to any one of claims 1-8.

10. A method for protecting a vehicle from electrical discharge, characterized in that, include: The first determining module is used to determine the battery capacity of the vehicle battery; The second determining module is used to determine the target discharge amount based on the battery capacity and the first preset SOC change. The third determining module is used to determine the change in the SOC of the battery management system based on the SOC of the vehicle's battery management system when the discharge amount of the vehicle battery discharged by the charging pile reaches the target discharge amount. The fourth determining module is used to determine whether the battery management system has malfunctioned based on the SOC change and the first preset SOC change. The control module is used to reduce the discharge power of the charging pile according to the change in SOC when the battery management system fails.

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