Charging method and device for low-voltage battery

Abstract

The invention discloses a charging method for a low-voltage battery, which can be applied to the technical field of vehicles, and comprises the following steps: acquiring the electric quantity consumed by the low-voltage battery in a first preset time period, and when the electric quantity consumed by the low-voltage battery in the first preset time period meets an electric quantity consumption condition, indicating that the low-voltage battery is in an abnormal power consumption state; therefore, the low-voltage battery can be charged, or the current residual electric quantity of the low-voltage battery can be obtained, and when the current residual electric quantity of the low-voltage battery meets the electric quantity residual condition, it is indicated that the low-voltage battery has the charging requirement, so that the low-voltage battery is charged. Whether the low-voltage battery is in the abnormal power consumption state or not can be judged, when the low-voltage battery is in the abnormal power consumption state, the electric quantity of the low-voltage battery is quickly consumed, so that the low-voltage battery is charged, or when the electric quantity of the low-voltage battery is too low, it is indicated that the low-voltage battery has a charging demand, so that the low-voltage battery is charged; therefore, the opportunity of charging the low-voltage battery by the high-voltage battery can be accurately determined.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a method and a device for charging a low-voltage battery. Background Art

[0002] The battery system of a new energy vehicle generally includes a high-voltage battery and a low-voltage battery. The high-voltage battery is used to supply power to high-voltage systems such as drive motors and air-conditioning compressors. The low-voltage battery is used to supply the required electrical energy to the starter, ignition system, and in-vehicle electrical equipment when the engine starts or runs at a low speed or the vehicle parks and shuts off the engine. At this time, the automotive generator does not generate electricity or the voltage is very low. When the electrical energy of the low-voltage battery is insufficient, the high-voltage battery can be used to charge the low-voltage battery.

[0003] Therefore, how to accurately determine the timing of the high-voltage battery to charge the low-voltage battery is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The present application provides a method for charging a low-voltage battery to accurately determine the timing of the high-voltage battery to charge the low-voltage battery, thereby reducing the risk of the low-voltage battery running out of power. The present application also provides a device for charging a low-voltage battery.

[0005] In a first aspect, the present application provides a method for charging a low-voltage battery, including:

[0006] Obtaining the power consumed by the low-voltage battery within a first preset time period;

[0007] When the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition, charging the low-voltage battery; that the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition indicates that the low-voltage battery is in an abnormal power consumption state;

[0008] Or;

[0009] Obtaining the remaining power of the low-voltage battery currently;

[0010] When the remaining power of the low-voltage battery currently meets the remaining power condition, charging the low-voltage battery; that the remaining power of the low-voltage battery currently meets the remaining power condition indicates that the low-voltage battery has a charging requirement.

[0011] Optionally, when the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition, charging the low-voltage battery includes:

[0012] Obtaining the actual capacity of the low-voltage battery, where the actual capacity is determined according to the theoretical capacity of the low-voltage battery and the aging information of the low-voltage battery;

[0013] Determine the power consumption percentage according to the ratio of the power consumed by the low-voltage battery within the first preset time period to the actual capacity;

[0014] When the power consumption percentage is greater than or equal to a preset power consumption ratio, recharge the low-voltage battery;

[0015] Or;

[0016] When the power consumed by the low-voltage battery within the first preset time period is greater than or equal to a preset power consumption threshold, recharge the low-voltage battery.

[0017] Optionally, when the current remaining power of the low-voltage battery meets the power remaining condition, recharging the low-voltage battery includes:

[0018] Determine the power ratio of the current remaining power of the low-voltage battery in the low-voltage battery capacity;

[0019] When the power ratio is greater than or equal to a preset power remaining ratio, recharge the low-voltage battery;

[0020] Or;

[0021] When the current remaining power of the low-voltage battery is greater than or equal to a preset power threshold, recharge the low-voltage battery.

[0022] Optionally, the method further includes:

[0023] Obtain the driving power required for the target vehicle to travel to the charging pile closest to the target vehicle;

[0024] Determine the lower limit of the high-voltage battery allowing charging to the low-voltage battery according to the driving power;

[0025] Recharging the low-voltage battery includes:

[0026] When the current remaining power of the high-voltage battery is greater than the lower limit, recharge the low-voltage battery.

[0027] Optionally, the method further includes:

[0028] When the power ratio of the current remaining power of the low-voltage battery in the low-voltage battery capacity is greater than or equal to a preset recharge ratio, end the recharge;

[0029] When the current remaining power of the low-voltage battery is greater than or equal to a preset recharge threshold, end the recharge;

[0030] When the recharge time of the low-voltage battery meets the preset time, end the recharge;

[0031] When the vehicle control unit (VCU) feedbacks that the charging replenishment fails, end the charging replenishment.

[0032] Optionally, when ending the charging replenishment and determining that the low-voltage battery is in an abnormal power consumption state, the method further includes:

[0033] Perform a soft restart on the target vehicle.

[0034] Optionally, the method further includes:

[0035] Obtain the current of the vehicle low-voltage system after a second preset time period after the soft restart;

[0036] When the current is less than the current threshold, turn off the charging replenishment main control node and enter the sleep state;

[0037] When the current is greater than or equal to the current threshold, perform a soft restart on the target vehicle again.

[0038] Optionally, the performing a soft restart on the target vehicle again includes: when the number of soft restart times is less than or equal to the preset number of times, perform a soft restart on the target vehicle again.

[0039] In a second aspect, the present application provides a charging replenishment device for a low-voltage battery, including:

[0040] A first acquisition unit, configured to acquire the power consumed by the low-voltage battery within a first preset time period;

[0041] A first charging replenishment unit, configured to charge the low-voltage battery when the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition; the fact that the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition indicates that the low-voltage battery is in an abnormal power consumption state;

[0042] Or;

[0043] A second acquisition unit, configured to acquire the remaining power of the low-voltage battery currently;

[0044] A second charging replenishment unit, configured to charge the low-voltage battery when the remaining power of the low-voltage battery currently meets the remaining power condition; the fact that the remaining power of the low-voltage battery currently meets the remaining power condition indicates that the low-voltage battery has a charging replenishment requirement.

[0045] Optionally, the first charging replenishment unit is specifically configured to:

[0046] Acquire the actual capacity of the low-voltage battery, where the actual capacity is determined according to the theoretical capacity of the low-voltage battery and the aging information of the low-voltage battery;

[0047] Determine the power consumption percentage according to the ratio of the power consumed by the low-voltage battery within the first preset time period to the actual capacity;

[0048] When the power consumption percentage is greater than or equal to the preset power consumption ratio, recharge the low-voltage battery;

[0049] Or;

[0050] When the power consumed by the low-voltage battery within the first preset time period is greater than or equal to the preset power consumption threshold, recharge the low-voltage battery.

[0051] Optionally, the second recharge unit is specifically configured to determine the power ratio of the current remaining power of the low-voltage battery in the low-voltage battery capacity;

[0052] When the power ratio is greater than or equal to the preset remaining power ratio, recharge the low-voltage battery;

[0053] Or;

[0054] When the current remaining power of the low-voltage battery is greater than or equal to the preset power threshold, recharge the low-voltage battery.

[0055] Optionally, the recharge device further includes:

[0056] A third acquisition unit, configured to acquire the driving power required for the target vehicle to travel to the charging pile closest to the target vehicle.

[0057] A first determination unit, configured to determine the lower limit of the high-voltage battery's allowable charging of the low-voltage battery according to the driving power.

[0058] The first recharge unit is specifically configured to recharge the low-voltage battery when the current remaining power of the high-voltage battery is greater than the lower limit.

[0059] The second recharge unit is specifically configured to recharge the low-voltage battery when the current remaining power of the high-voltage battery is greater than the lower limit.

[0060] Optionally, the recharge device further includes:

[0061] A first end recharge unit, configured to end the recharge when the power ratio of the current remaining power of the low-voltage battery in the low-voltage battery capacity is greater than or equal to the preset recharge ratio;

[0062] A second end recharge unit, configured to end the recharge when the current remaining power of the low-voltage battery is greater than or equal to the preset recharge threshold;

[0063] A third end recharge unit, configured to end the recharge when the recharge time of the low-voltage battery meets the preset time;

[0064] The fourth end-of-charging unit is used to end the charging when the vehicle control unit (VCU) feedbacks that the charging fails.

[0065] Optionally, when ending the charging and determining that the low-voltage battery is in an abnormal power consumption state, the charging device further includes:

[0066] The first soft restart unit is used to perform a soft restart on the target vehicle.

[0067] Optionally, the charging device further includes:

[0068] The fourth acquisition unit is used to acquire the current of the vehicle low-voltage system after a second preset time period after the soft restart;

[0069] The shutdown unit is used to shut down the charging main control node and enter the sleep state when the current is less than the current threshold;

[0070] The second soft restart unit is used to perform a soft restart on the target vehicle again when the current is greater than or equal to the current threshold.

[0071] Optionally, the second soft restart unit is specifically used for:

[0072] When the number of soft restart times is less than or equal to the preset number of times, perform a soft restart on the target vehicle again.

[0073] In a third aspect, the present application provides a vehicle, including the charging device for the low-voltage battery as described in the second aspect.

[0074] In a fourth aspect, an embodiment of the present application provides a computer storage medium, in which code is stored, and when the code is run, the device running the code implements the method described in any item of the first aspect above.

[0075] Compared with the prior art, the present application has the following beneficial effects:

[0076] In this application, the power consumption of the low-voltage battery within the first preset time period can be obtained. When the power consumption of the low-voltage battery within the first preset time period meets the power consumption condition, it indicates that the low-voltage battery is in an abnormal power consumption state, so that the low-voltage battery can be charged. Or, the remaining power of the low-voltage battery can be obtained. When the remaining power of the low-voltage battery meets the remaining power condition, it indicates that the low-voltage battery has a charging requirement, so that the low-voltage battery is charged. In this application, it can be determined whether the low-voltage battery is in an abnormal power consumption state. When in an abnormal power consumption state, the power of the low-voltage battery will be quickly consumed, so as to charge the low-voltage battery. Or, when the power of the low-voltage battery is too low, it indicates that the low-voltage battery has a charging requirement, so that the low-voltage battery is charged. In this way, the timing for the high-voltage battery to charge the low-voltage battery can be accurately determined, so as to reduce the risk of power failure of the low-voltage battery and avoid frequent charging of the voltage battery, reducing the service life of the low-voltage battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] To more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0078] Figure 1 It is a flowchart of a method for charging a low-voltage battery provided by an embodiment of the present application;

[0079] Figure 2 It is a flowchart of another method for charging a low-voltage battery provided by an embodiment of the present application;

[0080] Figure 3 It is a schematic diagram of a device for charging a low-voltage battery provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0081] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0082] It should be noted that a method and a device for charging a low-voltage battery provided by the present application can be applied to the vehicle field. The above is only an example and does not limit the application field of the names of the method and the device provided by the present application.

[0083] The battery system of a new energy vehicle generally includes a high-voltage battery and a low-voltage battery. The high-voltage battery is used to supply power to high-voltage systems, such as high-voltage devices like drive motors and air-conditioning compressors. The low-voltage battery is used to provide the required electrical energy for the starter, ignition system, and in-vehicle electrical equipment when the engine starts, runs at a low speed, or the vehicle parks and shuts off, because the vehicle generator does not generate electricity or the voltage is very low at this time. When the electrical energy of the low-voltage battery is insufficient, the high-voltage battery can be used to charge the low-voltage battery.

[0084] If the low-voltage battery is charged too frequently, it will damage the life of the low-voltage battery. If the low-voltage battery is not charged in time, there will be a risk of power failure for the low-voltage battery.

[0085] Therefore, how to accurately determine the timing of the high-voltage battery to charge the low-voltage battery is a technical problem that needs to be urgently solved by those skilled in the art.

[0086] In view of this, the present application provides a method for charging a low-voltage battery. In the present application, the power consumption of the low-voltage battery within a first preset time period can be obtained. When the power consumption of the low-voltage battery within the first preset time period meets the power consumption condition, it indicates that the low-voltage battery is in an abnormal power consumption state, and thus the low-voltage battery can be charged. Or, the remaining power of the low-voltage battery at present can be obtained. When the remaining power of the low-voltage battery at present meets the remaining power condition, it indicates that the low-voltage battery has a charging requirement, and thus the low-voltage battery can be charged. In the present application, it can be determined whether the low-voltage battery is in an abnormal power consumption state. When in an abnormal power consumption state, the power of the low-voltage battery will be quickly consumed, and thus the low-voltage battery can be charged. Or, when the power of the low-voltage battery is too low, it indicates that the low-voltage battery has a charging requirement, and thus the low-voltage battery can be charged. In this way, the timing of the high-voltage battery to charge the low-voltage battery can be accurately determined, so as to reduce the risk of power failure of the low-voltage battery and avoid charging the voltage battery frequently, reducing the life of the low-voltage battery.

[0087] In order to enable those skilled in the art to better understand the solution of the present application, the following further describes the present application in detail with reference to the drawings and specific embodiments. The following takes the method provided by the embodiment of the present application being executed by a first device as an example for description.

[0088] Figure 1 It is a flowchart of a method for charging a low-voltage battery provided by an embodiment of the present application. As Figure 1 shown, the method may include:

[0089] S101A: Obtain the power consumption of the low-voltage battery within a first preset time period.

[0090] A vehicle generally includes a high-voltage battery and a low-voltage battery (low-voltage storage battery). The low-voltage battery is used to provide the required electrical energy for the starter, ignition system, and in-vehicle electrical equipment when the engine is starting or running at a low speed, because the automotive generator does not generate electricity or the voltage is very low at this time. The first device can obtain the power of the low-voltage battery within the first preset time period. Among them, the first preset time can be set according to requirements. For example, it can be set to 30 minutes, and there is no limit here.

[0091] S102A: When the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition, recharge the low-voltage battery.

[0092] After the first device obtains the power of the low-voltage battery within the first preset time period, it can judge whether the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition. When the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition, it can be indicated that the low-voltage battery is currently in an abnormal power consumption state, and then the low-voltage battery can be recharged. Among them, the abnormal power consumption state can be that some controllers are abnormally identified as the initial wake-up source demand due to electromagnetic interference or some abnormal working conditions cause the controller software to freeze and unable to sleep normally.

[0093] Specifically, the actual capacity of the low-voltage battery determined according to the theoretical capacity of the low-voltage battery and the aging information of the low-voltage battery can be obtained, and the power consumption percentage can be determined according to the ratio of the power consumed by the low-voltage battery within the first preset time period to the actual capacity. When the power consumption percentage is greater than or equal to the preset power consumption ratio, it can be determined that the power consumption condition is met. Exemplarily, the theoretical capacity of the low-voltage battery is 5000 mAh, and the aging information (state of health of the battery SOH) is a 20% attenuation. Then, the actual capacity of the low-voltage battery that can be determined according to the theoretical capacity of the low-voltage battery and the aging information of the low-voltage battery is 4000 mAh. The power consumed by the low-voltage battery within the first preset time period is 400 mAh. According to the ratio of the power consumed by the low-voltage battery within the first preset time period to the actual capacity, it can be determined that the power consumption percentage is 10%. The preset power consumption ratio can be set to 5% for example. Then, at this time, it can be determined that the power consumption condition is met, and the high-voltage battery can be used to recharge the low-voltage battery. It should be noted that the theoretical capacity of the low-voltage battery is generally 40 - 60 Ah. The above-mentioned theoretical capacity of the low-voltage battery and the mentioned data are only examples and are not limited here.

[0094] In some possible implementations, it is also possible to determine whether the power consumed by the low-voltage battery within the first preset time period is greater than or equal to a preset power consumption threshold. When the power consumed by the low-voltage battery within the first preset time period is greater than or equal to the preset power consumption threshold, it can be determined that the power consumption condition is met. Exemplarily, the power consumption threshold is 400 mAh, and the power consumed by the low-voltage battery within the first preset time period is 500 mAh. When the power consumed by the low-voltage battery within the first preset time period is greater than the preset power consumption threshold, it can be determined that the power consumption condition is met, and the high-voltage battery can be used to charge the low-voltage battery.

[0095] S101B: Obtain the current remaining power of the low-voltage battery.

[0096] The first device can obtain the current remaining power of the low-voltage battery. Among them, the current remaining power of the low-voltage battery can be a specific value. For example, the current remaining power of the low-voltage battery is 4000 mAh, or it can also be the power ratio of the current remaining power of the low-voltage battery in the capacity of the low-voltage battery. For example, the current remaining power of the low-voltage battery is 70%.

[0097] S102B: When the current remaining power of the low-voltage battery meets the power remaining condition, charge the low-voltage battery.

[0098] After the first device obtains the current remaining power of the low-voltage battery, it can determine whether the current remaining power of the low-voltage battery meets the power remaining condition. When the current remaining power of the low-voltage battery meets the power remaining condition, it can be determined that the current remaining power of the low-voltage battery is too low, that is, the low-voltage battery has a charging requirement, and thus the high-voltage battery can be used to charge the low-voltage battery.

[0099] Specifically, determine the power ratio of the current remaining power of the low-voltage battery in the capacity of the low-voltage battery. When the power ratio is greater than or equal to the preset power remaining ratio, the high-voltage battery can be used to charge the low-voltage battery. Exemplarily, for example, the power remaining ratio is 20%, and the power ratio of the current remaining power of the low-voltage battery in the capacity of the low-voltage battery is determined to be 15%. Then it can be determined that the current remaining power of the low-voltage battery is too low, and the low-voltage battery has a charging requirement, and further the high-voltage battery is used to charge the low-voltage battery.

[0100] In some possible implementations, when the current remaining power of the low-voltage battery is greater than or equal to a preset power threshold, the high-voltage battery can be used to charge the low-voltage battery. Exemplarily, the power threshold is 1000 mAh. When the current remaining power of the low-voltage battery is 800 mAh, it can be determined that the current remaining power of the low-voltage battery is too low, and the low-voltage battery has a charging requirement. Then, the high-voltage battery is used to charge the low-voltage battery. In this application, the power consumed by the low-voltage battery within the first preset time period can be obtained. When the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition, it indicates that the low-voltage battery is in an abnormal power consumption state, so the low-voltage battery can be charged. Or, the current remaining power of the low-voltage battery is obtained. When the current remaining power of the low-voltage battery meets the power remaining condition, it indicates that the low-voltage battery has a charging requirement, so the low-voltage battery is charged. In this application, it can be determined whether the low-voltage battery is in an abnormal power consumption state. When in an abnormal power consumption state, the power of the low-voltage battery will be quickly consumed, so the low-voltage battery is charged. Or, when the power of the low-voltage battery is too low, it indicates that the low-voltage battery has a charging requirement, so the low-voltage battery is charged. In this way, the timing for the high-voltage battery to charge the low-voltage battery can be accurately determined, so as to reduce the risk of the low-voltage battery running out of power and avoid frequent charging of the voltage battery, which may reduce the service life of the low-voltage battery.

[0101] The above embodiment can be referred to as Embodiment 1. In addition, this application also provides another embodiment, which can be referred to as Embodiment 2. The following takes the first device as the execution subject to introduce Embodiment 2 provided by the embodiments of this application:

[0102] S201: Determine whether the parking time is greater than the preset time.

[0103] In some possible implementations, the charging master node GW needs to be woken up before obtaining the current remaining power of the low-voltage battery. Otherwise, the current remaining power of the low-voltage battery may not be obtained. And to avoid the charging master node GW being always in the on state and consuming electric energy, this step is added to judge the parking time of the vehicle. That is, the charging master node GW is turned on after the low-voltage battery has consumed power for a certain period of time, and it is judged whether the current remaining power of the low-voltage battery meets the power remaining condition.

[0104] Further, when it is determined that the parking time is greater than the preset time, step S202 can be executed to wake up the charging master node GW. When it is determined that the parking time is greater than the preset time, step S203B can be executed to determine whether the power consumption of the low-voltage battery within the first preset time period meets the power consumption condition, that is, to determine whether the low-voltage battery is in an abnormal power consumption state. Among them, the parking time can be set in advance according to requirements. For example, it can be set to 8h. It should be noted that the judgment condition of step S201 can also be to determine whether the parking time is greater than or equal to the preset time, which is not limited here.

[0105] S202: Wake up the charging master node GW.

[0106] In some possible implementation manners, when the parking time is greater than the preset time, after the first device wakes up the charging master node GW, step S203A is executed to determine whether the remaining power of the low-voltage battery currently meets the remaining power condition.

[0107] In some possible implementation manners,

[0108] S203A: Determine whether the remaining power of the low-voltage battery currently meets the remaining power condition.

[0109] The specific judgment steps are similar to S102B and will not be elaborated here.

[0110] When it is determined that the remaining power condition is met, step S204 can be executed.

[0111] When it is determined that the remaining power condition is not met, step S209 can be executed.

[0112] S203B: Determine whether the power consumption of the low-voltage battery within the first preset time period meets the power consumption condition.

[0113] The specific judgment steps are similar to S102A and will not be elaborated here.

[0114] When it is determined that the power consumption condition is met, step S204 can be executed.

[0115] When it is determined that the power consumption condition is not met, step S201 is executed to continue to determine whether the parking time is greater than the preset time.

[0116] S204: Wake up the nodes related to the high-voltage system.

[0117] The first device wakes up the nodes related to the high-voltage system so as to execute step S205 to charge the low-voltage battery.

[0118] S205: Request the high-voltage system master node VCU to establish high voltage to charge the low-voltage battery.

[0119] The first device requests the high-voltage system master control node to establish high voltage for charging the low-voltage battery, and then executes step S206.

[0120] S206: Determine whether the high-voltage system meets the condition for establishing high voltage for charging.

[0121] The first device can determine whether the high-voltage system meets the condition for establishing high voltage for charging. That is to say, the first device needs to determine whether the remaining power of the high-voltage battery can charge the low-voltage battery, so as to avoid the problem of vehicle breakdown caused by charging the low-voltage battery due to insufficient power of the high-voltage battery.

[0122] Specifically, obtain the driving power Q1 required for the target vehicle to drive to the charging pile closest to the target vehicle or to go home, and determine the lower limit of the high-voltage battery allowing charging the low-voltage battery according to the driving power Q1 and the depth of discharge DOD of the battery.

[0123] In some possible implementation manners, a safety margin offset can be added to this lower limit to solve the situation of excessive power consumption of the battery in case of an accident. The safety margin offset can be preset according to requirements and is not limited here.

[0124] When the currently remaining power of the high-voltage battery is greater than or equal to the lower limit, it can be determined that the battery meets the condition for charging and the high-voltage system meets the condition for establishing high voltage for charging. Then the VCU controls to establish high voltage and controls the DCDC converter to enter the inverter working state. After it is determined that the DCDC converter enters the inverter working state, execute step S207.

[0125] When the currently remaining power of the high-voltage battery is less than the lower limit, it can be determined that the high-voltage system does not meet the condition for establishing high voltage for charging. At this time, the information of the failure of the GW to establish high voltage for charging feedback by the VCU can be received, and then execute step S209.

[0126] S207: Receive the information of successful GW charging feedback by the VCU.

[0127] S208: Determine whether the charging end condition is reached.

[0128] After the first device receives the information of successful GW charging feedback by the VCU, it can determine whether the charging end condition is reached.

[0129] Specifically, when any one of the following conditions is met, it can be determined that the charging end condition is reached:

[0130] 1. The ratio of the currently remaining power of the low-voltage battery to the power in the low-voltage battery capacity is greater than or equal to the preset charging ratio.

[0131] 2. The currently remaining power of the low-voltage battery is greater than or equal to the preset charging threshold.

[0132] 3. The charging time of the low-voltage battery meets the preset time, where the preset time can be set according to requirements, for example, it can be set to 30 min.

[0133] 4. The vehicle control unit (VCU) feedbacks that the charging fails, for example, the battery relay is stuck, the IGBT is short-circuited, etc.

[0134] When it is determined that the charging end condition is reached, step S209 is executed.

[0135] S209: Reset the parking time to 0 h.

[0136] The first device resets the parking time to 0 h, and then executes step S210.

[0137] S210: Determine whether this charging is caused by the low-voltage battery being in an abnormal power consumption state.

[0138] Specifically, determining whether this charging is caused by the low-voltage battery being in an abnormal power consumption state is similar to step 102A, and no redundant description is given here. When it is determined that this charging is caused by the low-voltage battery being in an abnormal power consumption state, step S211 is executed. When it is determined that this charging is not caused by the low-voltage battery being in an abnormal power consumption state, step S212 is executed.

[0139] S211: Control the soft restart of the nodes related to the vehicle charging system network.

[0140] The first device can control the soft restart of the nodes related to the vehicle charging system network through diagnostic messages to eliminate most scenarios of abnormal power consumption and reduce the charging frequency.

[0141] S212: Control the nodes related to the vehicle charging system network to enter the sleep state.

[0142] If this charging is caused by the low-voltage battery being in an abnormal power consumption state, after controlling the nodes related to the vehicle charging system network to enter the sleep state, step S213 can also be executed to further determine whether the soft restart is successful (whether the soft restart solves the problem).

[0143] S213: Determine whether the current of the vehicle low-voltage system after the second preset time period after the soft restart is lower than the current threshold.

[0144] The first device can determine whether the current of the vehicle's low-voltage system after a soft restart and after a second preset time period is lower than the current threshold. The current threshold can be preset, for example, 2A, and the second preset time period can also be set according to requirements, for example, 60 minutes. When the current of the vehicle's low-voltage system after a soft restart and after a second preset time period is lower than the current threshold, it can be determined that the soft restart is successful. When the current of the vehicle's low-voltage system after a soft restart and after a second preset time period is greater than or equal to the current threshold, it can be determined that the soft restart fails, and the current vehicle is still in an abnormal power consumption state. By using this method to determine whether the vehicle is still in an abnormal power consumption state, it is not necessary to control the GW to turn on, thus saving electric energy.

[0145] After determining that the soft restart fails, step S214 can be executed.

[0146] S214: Determine whether the number of soft restarts is less than or equal to a preset number.

[0147] The first device can determine whether the number of soft restarts is less than or equal to a preset number. The preset number can be set to 2. Of course, it can also be set to other numbers, which are not limited here. That is to say, after this soft restart fails, when the number of soft restarts is less than or equal to the preset number, a soft restart can be performed again, and step S211 is executed. When the number of soft restarts is greater than the preset number, it means that the number of soft restarts is relatively large, and the soft restart cannot solve the problem of abnormal power consumption of the current vehicle, so no more soft restarts are performed.

[0148] The above are some specific implementation manners of the method for replenishing power of the low-voltage battery provided by the embodiments of the present application. Based on this, the present application also provides a corresponding device for replenishing power of the low-voltage battery. The device for replenishing power of the low-voltage battery provided by the embodiments of the present application will be introduced below, and this method can be mutually corresponding and referred to the method for replenishing power of the low-voltage battery described above.

[0149] Figure 3 It is a schematic diagram of a device for replenishing power of a low-voltage battery provided by an embodiment of the present application. As Figure 3 shown, it includes:

[0150] The first acquisition unit 300 is used to acquire the power consumed by the low-voltage battery within a first preset time period;

[0151] The first power replenishment unit 310 is used to replenish power for the low-voltage battery when the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition; that the power consumed by the low-voltage battery within the first preset time period meets the power consumption condition indicates that the low-voltage battery is in an abnormal power consumption state;

[0152] Or;

[0153] The second acquisition unit 320 is used to acquire the remaining power of the low-voltage battery currently;

[0154] The second charging unit 330 is configured to charge the low-voltage battery when the remaining current power of the low-voltage battery meets the remaining power condition; the remaining current power of the low-voltage battery meeting the remaining power condition indicates that the low-voltage battery has a charging requirement.

[0155] Optionally, the first charging unit is specifically configured to:

[0156] Obtain the actual capacity of the low-voltage battery, where the actual capacity is determined according to the theoretical capacity of the low-voltage battery and the aging information of the low-voltage battery;

[0157] Determine the power consumption percentage according to the ratio of the power consumed by the low-voltage battery within the first preset time period to the actual capacity;

[0158] When the power consumption percentage is greater than or equal to a preset power consumption ratio, charge the low-voltage battery;

[0159] Or;

[0160] When the power consumed by the low-voltage battery within the first preset time period is greater than or equal to a preset power consumption threshold, charge the low-voltage battery.

[0161] Optionally, the second charging unit is specifically configured to determine the power ratio of the current remaining power of the low-voltage battery in the low-voltage battery capacity;

[0162] When the power ratio is greater than or equal to a preset remaining power ratio, charge the low-voltage battery;

[0163] Or;

[0164] When the current remaining power of the low-voltage battery is greater than or equal to a preset power threshold, charge the low-voltage battery.

[0165] Optionally, the charging device further includes:

[0166] A third acquisition unit, configured to acquire the driving power required for the target vehicle to travel to the charging pile closest to the target vehicle.

[0167] A first determination unit, configured to determine the lower limit of the high-voltage battery allowing charging to the low-voltage battery according to the driving power.

[0168] The first charging unit is specifically configured to charge the low-voltage battery when the current remaining power of the high-voltage battery is greater than the lower limit.

[0169] The second charging unit is specifically configured to charge the low-voltage battery when the current remaining power of the high-voltage battery is greater than the lower limit.

[0170] Optionally, the charging replenishment device further includes:

[0171] A first charging end unit, configured to end charging when the ratio of the current remaining power of the low-voltage battery to the capacity of the low-voltage battery is greater than or equal to a preset charging replenishment ratio;

[0172] A second charging end unit, configured to end charging when the current remaining power of the low-voltage battery is greater than or equal to a preset charging threshold;

[0173] A third charging end unit, configured to end charging when the charging time of the low-voltage battery meets a preset time;

[0174] A fourth charging end unit, configured to end charging when the vehicle control unit VCU feedbacks that the charging fails.

[0175] Optionally, when ending charging and determining that the low-voltage battery is in an abnormal power consumption state, the charging replenishment device further includes:

[0176] A first soft restart unit, configured to perform a soft restart on the target vehicle.

[0177] Optionally, the charging replenishment device further includes:

[0178] A fourth acquisition unit, configured to acquire the current of the vehicle low-voltage system after a second preset time period after the soft restart;

[0179] A shutdown unit, configured to shut down the charging main control node and enter a sleep state when the current is less than a current threshold;

[0180] A second soft restart unit, configured to perform a soft restart on the target vehicle again when the current is greater than or equal to the current threshold.

[0181] Optionally, the second soft restart unit is specifically configured to:

[0182] When the number of soft restart times is less than or equal to a preset number of times, perform a soft restart on the target vehicle again.

[0183] The embodiments of the present application also provide corresponding devices and computer storage media for implementing the solutions provided by the embodiments of the present application.

[0184] Wherein, the device includes a memory and a processor, the memory is used to store instructions or codes, and the processor is used to execute the instructions or codes so that the device executes the method described in any embodiment of the present application.

[0185] The computer storage medium stores codes, and when the codes are run, the device running the codes implements the charging method for the low-voltage battery described in any embodiment of the present application.

[0186] In the embodiments of the present application, the "first", "second" (if any) in the names such as "first" and "second" are only used as name identifiers and do not represent the first and second in sequence.

[0187] From the description of the above embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by means of software plus a general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, and the computer software product can be stored in a storage medium, such as read-only memory (ROM) / RAM, magnetic disk, optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to execute the methods described in various embodiments or some parts of the embodiments of the present application.

[0188] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for the relevant parts, reference can be made to the partial description of the method embodiments. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0189] The above description is only an exemplary embodiment of the present application and is not used to limit the protection scope of the present application.

Claims

1. A method for replenishing power of a low-voltage battery, characterized in that: include: Obtaining the power consumed by the low-voltage battery within a first preset time period; When the power consumed by the low-voltage battery in the first preset time period meets the power consumption condition, the low-voltage battery is recharged; the power consumed by the low-voltage battery in the first preset time period meets the power consumption condition, indicating that the low-voltage battery is in an abnormal power consumption state; or; Get the current remaining power of the low-voltage battery; When the current remaining power of the low-voltage battery meets the remaining power condition, the low-voltage battery is recharged; the current remaining power of the low-voltage battery meets the remaining power condition, indicating that the low-voltage battery has a need for recharging.

2. The method according to claim 1, characterized in that When the power consumed by the low-voltage battery in the first preset time period meets the power consumption condition, the low-voltage battery is charged, including: Acquire an actual capacity of the low-voltage battery, where the actual capacity is determined according to a theoretical capacity of the low-voltage battery and aging information of the low-voltage battery; Determining a percentage of power consumption according to a ratio of power consumed by the low-voltage battery within a first preset time period to the actual capacity; When the power consumption percentage is greater than or equal to a preset power consumption ratio, the low-voltage battery is charged; or; When the power consumed by the low-voltage battery within a first preset time period is greater than or equal to a preset power consumption threshold, the low-voltage battery is recharged.

3. The method according to claim 1, characterized in that When the current remaining power of the low-voltage battery meets the remaining power condition, the low-voltage battery is charged, including: Determine the ratio of the current remaining power of the low-voltage battery to the power capacity of the low-voltage battery; When the power ratio is greater than or equal to a preset power remaining ratio, the low-voltage battery is charged; or; When the current remaining power of the low-voltage battery is greater than or equal to a preset power threshold, the low-voltage battery is recharged.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Obtaining the amount of power required for the target vehicle to travel to the charging pile closest to the target vehicle; Determining a lower limit of the high-voltage battery allowed to charge the low-voltage battery according to the driving power; The step of replenishing power for the low-voltage battery comprises: When the current remaining power of the high-voltage battery is greater than the lower limit, the low-voltage battery is supplemented with power.

5. The method according to claim 4, characterized in that The method further comprises: When the ratio of the current remaining power of the low-voltage battery to the power of the low-voltage battery capacity is greater than or equal to the preset power replenishment ratio, the power replenishment is terminated; When the remaining power of the low-voltage battery is greater than or equal to a preset charging threshold, the charging is terminated; When the charging time of the low-voltage battery meets the preset time, the charging ends; When the vehicle controller VCU feedbacks that the power replenishment fails, the power replenishment is ended.

6. The method according to claim 5, characterized in that When the charging is finished and it is determined that the low-voltage battery is in an abnormal power consumption state, the method further includes: Perform a soft restart on the target vehicle.

7. The method according to claim 6, characterized in that The method further comprises: Acquiring a current of a low-voltage system of the vehicle after a second preset time period after the soft restart; When the current is less than the current threshold, the power supply master control node is turned off and enters a dormant state; When the current is greater than or equal to the current threshold, the target vehicle is soft restarted again.

8. The method according to claim 7, characterized in that The soft restarting the target vehicle again includes: when the number of soft restarts is less than or equal to a preset number of times, soft restarting the target vehicle again.

9. A low-voltage battery charging device, characterized in that: include: A first acquisition unit, used to acquire the power consumed by the low-voltage battery within a first preset time period; A first power replenishing unit, configured to replenish power for the low-voltage battery when the power consumed by the low-voltage battery within a first preset time period meets a power consumption condition; The power consumed by the low-voltage battery within the first preset time period meets the power consumption condition, indicating that the low-voltage battery is in an abnormal power consumption state; or; A second acquisition unit is used to acquire the current remaining power of the low-voltage battery; The second power replenishment unit is used to replenish the low-voltage battery when the current remaining power of the low-voltage battery meets the remaining power condition; the current remaining power of the low-voltage battery meets the remaining power condition, indicating that the low-voltage battery has a power replenishment demand.

10. The device according to claim 1, characterized in that The first power supply unit is specifically used for: Acquire an actual capacity of the low-voltage battery, where the actual capacity is determined according to a theoretical capacity of the low-voltage battery and aging information of the low-voltage battery; Determining a percentage of power consumption according to a ratio of power consumed by the low-voltage battery within a first preset time period to the actual capacity; When the power consumption percentage is greater than or equal to a preset power consumption ratio, the low-voltage battery is charged; or; When the power consumed by the low-voltage battery within a first preset time period is greater than or equal to a preset power consumption threshold, the low-voltage battery is recharged.

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