Electric vehicle battery charging method and system

Abstract

The present invention relates to a battery charging method and system for electric vehicles, wherein the battery charging method comprises: before the electric vehicle network goes into sleep, the battery is charged by using an active charging method before sleep, the active charging method before sleep presets a start charging standard and an end charging standard, and is used to realize active charging before network sleep; after the electric vehicle network goes into sleep, the battery is charged by using an active charging method after sleep, the active charging method after sleep adopts a timed wake-up charging strategy, and dynamically adjusts the shortest charging time according to the current consumption of the vehicle. Compared with the prior art, the present invention has the advantages of effectively preventing battery power loss and high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle power management, and in particular to an electric vehicle battery charging method and system. Background Art

[0002] Electric vehicles contain a high-voltage power battery and a low-voltage storage battery. When the vehicle is working normally, the power battery supplies power to the storage battery, and the storage battery supplies power to the vehicle's electrical equipment such as air conditioners and lights. When the high-voltage power battery is not charging the storage battery, the storage battery can continue to supply power to electrical appliances. After the vehicle is powered off and the network is dormant, the static current generated by each controller will consume the battery power; in addition, with the advent of the era of intelligent and connected vehicles, some functions are still required to be enabled after the vehicle is powered off, which will accelerate the consumption of the battery when certain functions are activated or the vehicle is abnormal. If no measures are taken for a long time, the battery will be depleted and the vehicle cannot be started again, which greatly affects the user experience.

[0003] To solve the problem of battery power shortage, the existing solution adopts the method of waking up the network after dormancy to use the power battery to replenish the battery or directly disconnecting the battery power supply. The main strategies are:

[0004] 1. After the vehicle is powered off and the network is dormant, the BMS will wake up the network regularly to determine the power battery level, door status and other conditions, and recharge the battery;

[0005] 2. Monitor the battery power in real time and wake up the vehicle to recharge the battery when the battery power is lower than the threshold;

[0006] 3. Add a battery relay, and disconnect the vehicle relay after locking the vehicle, stopping the power supply to the vehicle's electrical appliances.

[0007] The scheduled charging strategy adopted in Solution 1 cannot cope with the situation where the battery power is very low and a large static current appears after the vehicle is dormant. The battery may have been depleted due to excessive consumption before the scheduled charging starts. At this time, the whole vehicle cannot be awakened, and the charging cannot be completed when the scheduled charging time is reached.

[0008] Although Solution 2 can ensure that the battery can be recharged in time when the battery power is low, this strategy of real-time monitoring of the battery power is also consuming the battery power. At the same time, when an abnormally large current occurs, it will continue to consume the power battery power, shorten the battery life, and affect the user experience.

[0009] The methods of the power replenishment strategy adopted in Scheme 1 and Scheme 2 both use parameters such as voltage or power as the power replenishment judgment criteria. The use of a single parameter is more easily affected by the measurement error of the battery sensor.

[0010] Solution 3 simply disconnects the battery power supply when the owner leaves the vehicle. Although this fundamentally prevents the battery from running low, it completely disables the entire vehicle function and cannot meet the current user group's demand for diversified automobile functions. Summary of the invention

[0011] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a method and system for replenishing the battery of an electric vehicle which can effectively prevent the battery from running out of power and has high safety.

[0012] The purpose of the present invention can be achieved by the following technical solutions:

[0013] A method for replenishing power of an electric vehicle battery, the method comprising:

[0014] Before the electric vehicle network goes into sleep mode, the battery is replenished by using an active pre-sleep replenishment method. The active pre-sleep replenishment method presets a start replenishment standard and an end replenishment standard, which are used to realize active replenishment before the network goes into sleep mode.

[0015] After the electric vehicle network goes into sleep mode, an active power replenishment method after sleep mode is used to replenish the battery. The active power replenishment method after sleep mode adopts a timed wake-up power replenishment strategy and dynamically adjusts the shortest power replenishment time according to the current consumption of the vehicle.

[0016] Preferably, the starting power replenishment standard of the active power replenishment method before sleep is specifically:

[0017] When the battery SOC is lower than the first preset threshold or the battery voltage is lower than the second preset threshold, the battery replenishment is started;

[0018] The charging time is at least a third preset threshold value, and after the shortest charging time is reached, the charging end standard is used to determine whether to end the charging.

[0019] Preferably, the end power replenishment standard of the active power replenishment method before sleep is specifically:

[0020] The battery SOC is higher than a fourth preset threshold and the charging current is lower than a fifth preset threshold;

[0021] Or the total duration of the recharging is greater than the sixth preset threshold.

[0022] Preferably, the active charging method before sleep is also provided with a vehicle abnormality judgment standard. If the electric vehicle meets the standard, the corresponding exit strategy is executed and then the entire charging method is exited, thus ending the charging process.

[0023] The vehicle abnormality judgment criteria and the corresponding exit strategies are specifically as follows:

[0024] If the vehicle is powered off and a charging process is completed, the timing starts. If the vehicle network still cannot sleep after the duration reaches the seventh preset threshold, it is determined that the vehicle controller network management is abnormal. After another charging, the central controller sends instructions to all other controllers to disable all controller functions, force the network to sleep, and then exit the entire charging method, ending the charging process, and notifying the owner of the abnormal controller network management.

[0025] If it is impossible to use high voltage for charging, it is determined that the vehicle has abnormal high voltage during charging. The central controller immediately sends instructions to all controllers to disable all controller functions, then exits the entire charging method, ends the charging process, and notifies the owner of the abnormal high voltage during charging.

[0026] Preferably, the starting standard of the method for actively replenishing electricity after sleep is as follows:

[0027] After the network goes into hibernation, the battery sensor wakes up once at the eighth preset threshold, calculates the average current consumption I within the preset time, obtains the current battery SOC and voltage, and determines whether to start charging based on the following conditions:

[0028] The battery SOC is lower than the ninth preset threshold or the voltage is lower than the tenth preset threshold, and the charging time is at least T hours. After T hours of charging, the charging end standard is used to determine whether to end the charging.

[0029] More preferably, the termination standard of the active power replenishment method after sleep is as follows:

[0030] The battery SOC is higher than an eleventh preset threshold and the charging current is lower than a twelfth preset threshold;

[0031] Or the total duration of the recharging is greater than the thirteenth preset threshold.

[0032] More preferably, the dynamic adjustment strategy of the shortest charging time T is:

[0033]

[0034] More preferably, the method for actively replenishing electricity after dormancy is further provided with a vehicle abnormality judgment standard, and if the electric vehicle meets the standard, a corresponding replenishment strategy is executed;

[0035] The vehicle abnormality judgment criteria and the corresponding power replenishment strategy are as follows:

[0036] If the average current consumption is 50mA<I≤5A, the vehicle static current is determined to be excessive, and the vehicle will automatically replenish the current after sleep mode is executed normally, and the vehicle owner will be notified that the vehicle static current is excessive.

[0037] If the average current consumption I>5A, the static current of the vehicle controller is determined to be abnormal. After a power replenishment of T=2h, the central controller sends a command to all controllers to disable all controller functions, then exits the entire power replenishment method, ends the power replenishment process, and notifies the vehicle owner that the static current of the vehicle controller is abnormal.

[0038] If the vehicle detects abnormal network wake-up and the duration is greater than the fourteenth preset threshold, the vehicle network is determined to be abnormal, and after a power replenishment of T=2h, the central controller sends instructions to all controllers to disable all controller functions, then exits the entire power replenishment method, ends the power replenishment process, and notifies the vehicle owner of the vehicle network abnormality;

[0039] If after a request for charging is issued, charging is not possible due to a high voltage fault, the high voltage on the charging is determined to be abnormal, and the central controller sends instructions to all controllers to disable all controller functions, then exits the entire charging method, ends the charging process, and notifies the owner of the abnormal high voltage on the charging.

[0040] A battery charging system for an electric vehicle, the system comprising a power battery for charging the battery, the battery charging system comprising:

[0041] The active charging module before sleep is used to charge the battery according to the starting charging standard and the ending charging standard before sleep;

[0042] The specific standards for starting to replenish power for the active power replenishment module before sleep are:

[0043] When the battery SOC is lower than the first preset threshold or the battery voltage is lower than the second preset threshold, the battery replenishment is started;

[0044] The charging duration is at least a third preset threshold value, and after the shortest charging duration is reached, the charging termination standard is used to determine whether to terminate the charging;

[0045] The specific standards for ending the active power replenishment module before sleep are:

[0046] The battery SOC is higher than a fourth preset threshold and the charging current is lower than a fifth preset threshold;

[0047] or the total duration of the power replenishment is greater than the sixth preset threshold;

[0048] The active power replenishment module after dormancy is used to replenish the battery according to the starting power replenishment standard and the ending power replenishment standard before dormancy;

[0049] The specific standards for starting to replenish power for the active power replenishment module after sleep are:

[0050] After the network goes into hibernation, the battery sensor wakes up once at the eighth preset threshold, calculates the average current consumption I within the preset time, obtains the current battery SOC and voltage, and determines whether to start charging based on the following conditions:

[0051] The battery SOC is lower than the ninth preset threshold or the battery voltage is lower than the tenth preset threshold, the charging time is at least T hours, and after T hours of charging, the charging end standard determines whether to end the charging;

[0052] The specific standards for ending the active power replenishment module after sleep are as follows:

[0053] The battery SOC is higher than an eleventh preset threshold and the charging current is lower than a twelfth preset threshold;

[0054] Or the total duration of the recharging is greater than the thirteenth preset threshold.

[0055] Preferably, the active power replenishment module before sleep is provided with a minimum power replenishment duration dynamic adjustment unit, which embeds a dynamic adjustment strategy of the shortest power replenishment duration T, specifically:

[0056]

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] 1. Effectively prevent battery power loss: The electric vehicle battery charging method and system of the present invention adopts an active electronic charging method after sleep to avoid battery power loss caused by long-term parking of the vehicle. In order to alleviate the error in the accuracy of data collected by the battery sensor and ensure the effectiveness of charging, the battery voltage, power, and charging current are added to the conditions for judging the start and end of charging; at the same time, it is ensured that the charging will last for a fixed time after the start, and then whether to continue charging is determined according to the conditions; at the same time, in order to avoid the battery power being too low and the current consumption being abnormally large after the network is dormant, resulting in the battery being already depleted before waking up the network for charging, a pre-sleep electronic charging method is adopted, that is, the battery is charged in advance to ensure that the battery has a higher power after the network is dormant; the battery power loss is effectively prevented by adopting the pre-sleep electronic charging method and the post-sleep electronic charging method.

[0059] 2. High safety: The electric vehicle battery charging method and system of the present invention are designed to deal with vehicle abnormalities, such as excessive static current, network inability to sleep or inability to normally provide high voltage. The present invention dynamically adjusts the charging strategy according to actual conditions, and takes forced sleep measures when necessary to increase battery life. This also leaves users with enough time to deal with unrecoverable faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1The figure is a flow chart of the method for replenishing the battery of an electric vehicle in the present invention. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0062] A method for replenishing the battery of an electric vehicle, the process of which is as follows: Figure 1 As shown, including:

[0063] Before the electric vehicle network goes into sleep mode, the battery is replenished by using an active pre-sleep replenishment method. The active pre-sleep replenishment method presets a start replenishment standard and an end replenishment standard, which are used to realize active replenishment before the network goes into sleep mode.

[0064] After the electric vehicle network goes into sleep mode, an active power replenishment method after sleep mode is used to replenish the battery. The active power replenishment method after sleep mode adopts a timed wake-up power replenishment strategy and dynamically adjusts the shortest power replenishment time according to the current consumption of the vehicle.

[0065] The starting power replenishment standard of the active power replenishment method before sleep is as follows:

[0066] When the battery SOC is lower than the first preset threshold or the battery voltage is lower than the second preset threshold, the battery replenishment is started;

[0067] The charging time is at least a third preset threshold value, and after the shortest charging time is reached, the charging end standard is used to determine whether to end the charging.

[0068] The specific standards for ending the active power replenishment method before sleep are:

[0069] The battery SOC is higher than a fourth preset threshold and the charging current is lower than a fifth preset threshold;

[0070] Or the total duration of the recharging is greater than the sixth preset threshold.

[0071] The active charging method before sleep also has a vehicle abnormality judgment standard. If the electric vehicle meets the standard, the corresponding exit strategy is executed to exit the entire charging method and end the charging process.

[0072] The vehicle abnormality judgment criteria and their corresponding exit strategies are as follows:

[0073] If the vehicle is powered off and a charging process is completed, the timing starts. If the vehicle network still cannot sleep after the duration reaches the seventh preset threshold, it is determined that the vehicle controller network management is abnormal. After another charging, the central controller sends instructions to all other controllers to disable all controller functions, force the network to sleep, and then exit the entire charging method, ending the charging process, and notifying the owner of the abnormal controller network management.

[0074] If it is impossible to use high voltage for charging, it is determined that the vehicle has abnormal high voltage during charging. The central controller immediately sends instructions to all controllers to disable all controller functions, then exits the entire charging method, ends the charging process, and notifies the owner of the abnormal high voltage during charging.

[0075] The specific starting standard for the active power replenishment method after sleep is:

[0076] After the network goes into hibernation, the battery sensor wakes up once at the eighth preset threshold, calculates the average current consumption I within the preset time, obtains the current battery SOC and voltage, and determines whether to start charging based on the following conditions:

[0077] The battery SOC is lower than the ninth preset threshold or the voltage is lower than the tenth preset threshold, and the charging time is at least T hours. After T hours of charging, the charging end standard is used to determine whether to end the charging.

[0078] The specific standards for ending the active power replenishment method after sleep are:

[0079] The battery SOC is higher than an eleventh preset threshold and the charging current is lower than a twelfth preset threshold;

[0080] Or the total duration of the recharging is greater than the thirteenth preset threshold.

[0081] The dynamic adjustment strategy of the shortest charging time T is:

[0082]

[0083] The active charging method after dormancy also has a vehicle abnormality judgment standard. If the electric vehicle meets the standard, the corresponding charging strategy is executed. The vehicle abnormality judgment standard and its corresponding charging strategy are:

[0084] If the average current consumption is 50mA<I≤5A, the vehicle static current is determined to be excessive, and the vehicle will automatically replenish the current after sleep mode is executed normally, and the vehicle owner will be notified that the vehicle static current is excessive.

[0085] If the average current consumption I>5A, the static current of the vehicle controller is determined to be abnormal. After a power replenishment of T=2h, the central controller sends a command to all controllers to disable all controller functions, then exits the entire power replenishment method, ends the power replenishment process, and notifies the vehicle owner that the static current of the vehicle controller is abnormal.

[0086] If the vehicle detects abnormal network wake-up and the duration is greater than the fourteenth preset threshold, the vehicle network is determined to be abnormal, and after a power replenishment of T=2h, the central controller sends instructions to all controllers to disable all controller functions, then exits the entire power replenishment method, ends the power replenishment process, and notifies the vehicle owner of the vehicle network abnormality;

[0087] If after a request for charging is issued, charging is not possible due to a high voltage fault, the high voltage on the charging is determined to be abnormal, and the central controller sends instructions to all controllers to disable all controller functions, then exits the entire charging method, ends the charging process, and notifies the owner of the abnormal high voltage on the charging.

[0088] This embodiment also relates to an electric vehicle battery charging system, which includes a power battery for charging the battery. The battery charging system includes:

[0089] The active charging module before sleep is used to charge the battery according to the starting charging standard and the ending charging standard before sleep;

[0090] The specific standards for starting to replenish power for the active power replenishment module before sleep are:

[0091] When the battery SOC is lower than the first preset threshold or the battery voltage is lower than the second preset threshold, the battery replenishment is started;

[0092] The charging duration is at least a third preset threshold value, and after the shortest charging duration is reached, the charging termination standard is used to determine whether to terminate the charging;

[0093] The specific standards for ending the active power replenishment module before sleep are:

[0094] The battery SOC is higher than a fourth preset threshold and the charging current is lower than a fifth preset threshold;

[0095] or the total duration of the power replenishment is greater than the sixth preset threshold;

[0096] The active power replenishment module after dormancy is used to replenish the battery according to the starting power replenishment standard and the ending power replenishment standard before dormancy;

[0097] The specific standards for starting to replenish power for the active power replenishment module after sleep are:

[0098] After the network goes into hibernation, the battery sensor wakes up once at the eighth preset threshold, calculates the average current consumption I within the preset time, obtains the current battery SOC and voltage, and determines whether to start charging based on the following conditions:

[0099] The battery SOC is lower than the ninth preset threshold or the battery voltage is lower than the tenth preset threshold, the charging time is at least T hours, and after T hours of charging, the charging end standard determines whether to end the charging;

[0100] The specific standards for ending the active power replenishment module after sleep are as follows:

[0101] The battery SOC is higher than an eleventh preset threshold and the charging current is lower than a twelfth preset threshold;

[0102] Or the total duration of the recharging is greater than the thirteenth preset threshold.

[0103] The active power replenishment module before sleep is provided with a minimum power replenishment duration dynamic adjustment unit, which embeds a dynamic adjustment strategy of the shortest power replenishment duration T, specifically:

[0104]

[0105] The following is a specific application example:

[0106] 1. Actively replenishing electrons before sleep

[0107] In order to prevent abnormally high current or failure to provide high-voltage power after the network goes into sleep mode, the battery capacity (SOC) must be high enough before the network goes into sleep mode. To mitigate the error caused by the measurement accuracy of the battery sensor, multiple parameters are used as the criteria for starting and ending power replenishment. The strategy is as follows:

[0108] The standard for starting charging: when the battery SOC is lower than 80% or the voltage is lower than 12.7V, the charging is started. To prevent the battery sensor from measuring the SOC in error, the shortest charging time is 30 minutes. After 30 minutes, the standard for ending charging is used to determine whether to end the charging.

[0109] The end of charging standards are: 1. The battery SOC is higher than 90% and the charging current is less than 0.5A;

[0110] Or 2. The total duration of charging is longer than 4 hours.

[0111] In order to deal with abnormal situations before the network goes into sleep mode, the entire active power replenishment process will be exited in any of the following situations:

[0112] 1. The controller network management is abnormal and the network cannot sleep continuously.

[0113] When the vehicle is powered off and a charging process is completed, the timer starts. If the vehicle network still cannot sleep after 30 minutes, the central controller will send instructions to all other controllers after another charging process to disable all controller functions and force the network to sleep. Exit the charging process and do not repeat the charging process to avoid excessive loss of the power battery due to repeated charging of the battery. Finally, the owner is notified of abnormal vehicle controller network management through the mobile phone APP and repairs are carried out in time.

[0114] 2. High voltage fault, unable to replenish power

[0115] When high voltage recharging is not possible, the central controller immediately sends instructions to all controllers to disable all controller functions, minimize the energy consumption of the entire vehicle, and notify the owner of abnormal high voltage recharging through the mobile phone APP for timely maintenance.

[0116] 2. Active electronic replenishment method after sleep

[0117] It is mainly used to minimize the power consumption of the whole vehicle after the network is completely dormant. However, in order to ensure that some controller functions can be enabled, a certain amount of static current will still be generated. In addition, in order to deal with abnormally large currents, active power replenishment is still required. In order to minimize energy consumption, this solution adopts a strategy of timed wake-up power replenishment; at the same time, in order to ensure the effectiveness of power replenishment as much as possible, the minimum power replenishment time is dynamically adjusted according to current consumption. The specific measures are:

[0118] After the network goes into hibernation, the battery sensor wakes up every 3 hours, calculates the average current consumption I within 3 hours, and obtains the battery SOC and voltage at that time, and determines whether to recharge based on the following standards for starting and ending recharge:

[0119] The standard for starting charging: when the battery SOC is lower than 60% or the voltage is lower than 12.4V, the charging is started. To prevent the battery sensor from measuring the SOC in error, the minimum charging time is T hours. After T hours, the charging end standard is used to determine whether to end the charging.

[0120] The end of charging standards are: 1. The battery SOC is higher than 80% and the charging current is less than 1A;

[0121] Or 2. The total duration of charging is longer than 6 hours.

[0122] The minimum charging time T is adjusted according to the average current consumption I, as follows

[0123]

[0124] If I>5A, please follow the exception handling method below and it will not be considered here.

[0125] Several exception handling methods are as follows:

[0126] 1. If the average current within 3 hours is within the range of 50mA<I≤5A, it means the static current exceeds the standard. However, it is within the acceptable range of this solution. The charging is carried out normally, and the owner is reminded through the APP that the vehicle current exceeds the standard and repairs are carried out in time.

[0127] 2. If the average current I>5A within 3 hours, the current is too high. After the T value is taken for 2 hours and the power is replenished once, the central controller will immediately send instructions to all controllers to disable all controller functions to minimize the energy consumption of the vehicle. The owner will be notified of abnormal static current of the controller through the mobile phone APP and repair it in time.

[0128] 3. If the vehicle detects abnormal network wake-up and the duration is greater than 30 minutes, the central controller will immediately send instructions to all controllers after recharging once according to the T value of 2h to disable all controller functions to minimize the energy consumption of the vehicle, and notify the owner of the vehicle network abnormality through the mobile phone APP for timely maintenance;

[0129] 4 After the request for recharging, if the recharging is not possible due to the high voltage failure, the central controller will immediately send instructions to all controllers to disable all controller functions to minimize the energy consumption of the vehicle, and notify the owner of the abnormal high voltage recharging through the mobile phone APP for timely maintenance;

[0130] After completing the above-mentioned exception handling steps 2, 3, and 4, the power replenishment process will be exited.

[0131] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for replenishing the battery of an electric vehicle, characterized in that: The battery charging method comprises: Before the electric vehicle network goes into sleep mode, the battery is replenished by using an active pre-sleep replenishment method. The active pre-sleep replenishment method presets a start replenishment standard and an end replenishment standard, which are used to realize active replenishment before the network goes into sleep mode. After the electric vehicle network goes into sleep mode, the battery is recharged by an active recharge method after sleep mode. The active recharge method after sleep mode adopts a timed wake-up recharge strategy and dynamically adjusts the shortest recharge time T according to the average current consumption I of the vehicle. The starting standard of the active power replenishment method before sleep is as follows: When the battery SOC is lower than the first preset threshold or the battery voltage is lower than the second preset threshold, the charging is started; the charging duration is at least the third preset threshold, and after the shortest charging duration is reached, the charging termination standard is used to determine whether to terminate the charging; The specific end standard of the active power replenishment method before sleep is: The battery SOC is higher than a fourth preset threshold and the charging current is lower than a fifth preset threshold; or the total duration of the power replenishment is greater than the sixth preset threshold; The specific starting standard for the active power replenishment method after sleep is: After the network goes into hibernation, the battery sensor wakes up once at the eighth preset threshold, calculates the average current consumption I within the preset time, obtains the current battery SOC and voltage, and determines whether to start charging based on the following conditions: The battery SOC is lower than the ninth preset threshold or the voltage is lower than the tenth preset threshold, and the charging time is at least T hours. After T hours of charging, the charging end standard is used to determine whether to end the charging.

2. The method for replenishing the battery of an electric vehicle according to claim 1, characterized in that: The active charging method before sleep is also provided with a vehicle abnormality judgment standard. If the electric vehicle meets the standard, the corresponding exit strategy is executed to exit the entire charging method and end the charging process. The vehicle abnormality judgment criteria and the corresponding exit strategies are specifically as follows: If the vehicle is powered off and a charging process is completed, the timing starts. If the vehicle network still cannot sleep after the duration reaches the seventh preset threshold, it is determined that the vehicle controller network management is abnormal. After another charging, the central controller sends instructions to all other controllers to disable all controller functions, force the network to sleep, and then exit the entire charging method, ending the charging process, and notifying the owner of the abnormal controller network management. If it is impossible to use high voltage for charging, it is determined that the vehicle has abnormal high voltage during charging. The central controller immediately sends instructions to all controllers to disable all controller functions, then exits the entire charging method, ends the charging process, and notifies the owner of the abnormal high voltage during charging.

3. The method for replenishing the battery of an electric vehicle according to claim 1, characterized in that: The specific standard for ending the power replenishment method of active power replenishment after sleep is: The battery SOC is higher than an eleventh preset threshold and the charging current is lower than a twelfth preset threshold; Or the total duration of the recharging is greater than the thirteenth preset threshold.

4. The method for replenishing the battery of an electric vehicle according to claim 1, characterized in that: The dynamic adjustment strategy of the shortest charging time T is:

5. The method for replenishing the battery of an electric vehicle according to claim 1, characterized in that: The method for actively replenishing electricity after dormancy is also provided with a vehicle abnormality judgment standard. If the electric vehicle meets the standard, a corresponding replenishment strategy is executed; The vehicle abnormality judgment criteria and the corresponding power replenishment strategy are as follows: If the average current consumption is 50mA<I≤5A, the vehicle static current is determined to be excessive, and the vehicle will automatically replenish the current after sleep mode is executed normally, and the vehicle owner will be notified that the vehicle static current is excessive. If the average current consumption I>5A, the static current of the vehicle controller is determined to be abnormal. After a power replenishment of T=2h, the central controller sends a command to all controllers to disable all controller functions, then exits the entire power replenishment method, ends the power replenishment process, and notifies the vehicle owner that the static current of the vehicle controller is abnormal. If the vehicle detects abnormal network wake-up and the duration is greater than the fourteenth preset threshold, the vehicle network is determined to be abnormal, and after a power replenishment of T=2h, the central controller sends instructions to all controllers to disable all controller functions, then exits the entire power replenishment method, ends the power replenishment process, and notifies the vehicle owner of the vehicle network abnormality; If after a request for charging is issued, charging is not possible due to a high voltage fault, the high voltage on the charging is determined to be abnormal, and the central controller sends instructions to all controllers to disable all controller functions, then exits the entire charging method, ends the charging process, and notifies the owner of the abnormal high voltage on the charging.

6. An electric vehicle battery charging system, the system includes a power battery, used to charge the battery, characterized in that: The battery charging system comprises: The active charging module before sleep is used to charge the battery according to the starting charging standard and the ending charging standard before sleep; The specific standards for starting to replenish power for the active power replenishment module before sleep are: When the battery SOC is lower than the first preset threshold or the battery voltage is lower than the second preset threshold, the battery replenishment is started; The charging duration is at least a third preset threshold value, and after the shortest charging duration is reached, the charging termination standard is used to determine whether to terminate the charging; The specific standards for ending the active power replenishment module before sleep are: The battery SOC is higher than a fourth preset threshold and the charging current is lower than a fifth preset threshold; or the total duration of the power replenishment is greater than the sixth preset threshold; The post-sleep active charging module is used to charge the battery according to the starting charging standard and the ending charging standard after the sleep state; the post-sleep active charging module is provided with a minimum charging time dynamic adjustment unit, which is embedded with a dynamic adjustment strategy for dynamically adjusting the shortest charging time T according to the average current consumption I of the vehicle; The specific standards for starting to replenish power for the active power replenishment module after sleep are: After the network goes into hibernation, the battery sensor wakes up once at the eighth preset threshold, calculates the average current consumption I within the preset time, obtains the current battery SOC and voltage, and determines whether to start charging based on the following conditions: The battery SOC is lower than the ninth preset threshold or the battery voltage is lower than the tenth preset threshold, the charging time is at least T hours, and after T hours of charging, the charging end standard determines whether to end the charging; The specific standards for ending the active power replenishment module after sleep are as follows: The battery SOC is higher than an eleventh preset threshold and the charging current is lower than a twelfth preset threshold; Or the total duration of the recharging is greater than the thirteenth preset threshold.

7. The electric vehicle battery charging system according to claim 6, characterized in that: The dynamic adjustment strategy of the shortest charging time T is specifically as follows:

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