Method for charging new energy vehicle battery

Abstract

The application discloses a power supplementing method for a new energy vehicle battery and belongs to the technical field of vehicle batteries. The method is applied to a vehicle controller and comprises the following steps: in the case that a vehicle is in an active wake-up state, the state of charge of a battery and the state of charge of a power battery are acquired; in the case that the state of charge of the battery is less than a first charge threshold, the current ambient temperature is acquired; based on the current ambient temperature, a power supplementing threshold corresponding to the temperature interval in which the current ambient temperature is located is determined, wherein the ambient temperature is divided into a plurality of temperature intervals, and different temperature intervals correspond to different power supplementing thresholds; and in response to the state of charge of the power battery being greater than or equal to the power supplementing threshold corresponding to the temperature interval in which the current ambient temperature is located, the power battery is controlled to supplement power to the battery. The method ensures that the battery realizes power supplementing, takes into account the power of the power battery, and guarantees the drivability of the vehicle.

Description

Technical Field

[0001] This application relates to the field of vehicle battery technology, and in particular to a method for replenishing the battery of a new energy vehicle. Background Technology

[0002] New energy vehicle batteries need to power multiple components (such as headlights). To ensure battery charge, the battery is typically replenished periodically and quantitatively using a power battery connected to the vehicle's internal circuitry. Ambient temperature significantly affects the charging and discharging performance of the power battery. Therefore, under varying ambient temperatures, ensuring the power battery provides power to the vehicle's power system while simultaneously replenishing the battery periodically and quantitatively, thus guaranteeing the vehicle's drivability, is particularly important. Summary of the Invention

[0003] In view of this, this application provides a method for replenishing the battery of a new energy vehicle, which takes the ambient temperature into account when controlling the power battery to replenish the battery. While ensuring that the battery is replenished, the power battery's charge is also taken into account, thus ensuring the vehicle's drivability.

[0004] Specifically, the following technical solutions are included:

[0005] This application provides a method for replenishing the battery of a new energy vehicle, applied to a vehicle controller, the method comprising:

[0006] When in active wake-up state, the state of charge of the storage battery and the state of charge of the power battery are obtained.

[0007] If the state of charge of the battery is less than a first charge threshold, the current ambient temperature is obtained.

[0008] Based on the current ambient temperature, the charging threshold corresponding to the temperature range where the current ambient temperature is located is determined, wherein the ambient temperature is divided into multiple temperature ranges, and different temperature ranges correspond to different charging thresholds.

[0009] In response to the state of charge of the power battery being greater than or equal to the charging threshold corresponding to the temperature range of the current ambient temperature, the power battery is controlled to charge the storage battery.

[0010] In some embodiments, the plurality of temperature ranges includes a first temperature range, a second temperature range, and a third temperature range divided into temperature ranges from small to large. Determining the charging threshold corresponding to the temperature range where the current ambient temperature falls, based on the current ambient temperature, includes:

[0011] When the current ambient temperature is within the first temperature range, the power replenishment threshold is determined to be the first power replenishment threshold;

[0012] When the current ambient temperature is within the second temperature range, the power replenishment threshold is determined to be the second power replenishment threshold;

[0013] When the current ambient temperature is within the third temperature range, the power replenishment threshold is determined to be the third power replenishment threshold;

[0014] Wherein, the first replenishment threshold is greater than the second replenishment threshold, and the second replenishment threshold is greater than the third replenishment threshold.

[0015] In some embodiments, the method further includes:

[0016] If the current ambient temperature does not fall within a corresponding temperature range, disconnect the electrical connection between the power battery and the storage battery.

[0017] In some embodiments, after controlling the power battery to recharge the storage battery in response to the state of charge of the power battery being greater than or equal to the recharge threshold corresponding to the temperature range of the current ambient temperature, the method further includes:

[0018] In response to the control of the power battery to replenish the storage battery, the control timer starts timing;

[0019] In response to the timer reaching the target charging duration, the electrical connection between the power battery and the storage battery is disconnected.

[0020] In some embodiments, after the timer starts counting in response to the control of the power battery to replenish the storage battery, the method further includes:

[0021] In response to the start of the control timer calculating the replenishment duration, the replenishment current is acquired in real time;

[0022] Within the first period after the charging begins, in response to the charging current being less than the current threshold and lasting for a preset period of time, the electrical connection between the power battery and the storage battery is disconnected.

[0023] After the first duration following the start of charging, in response to the charging current being greater than or equal to the current threshold, the state of charge of the storage battery and the state of charge of the power battery are acquired again.

[0024] The target charging time is determined based on the state of charge of the storage battery and the state of charge of the power battery.

[0025] In some embodiments, the state of charge (SOC) of the power battery falls within a corresponding SOC range, which includes a first SOC range, a second SOC range, and a third SOC range, with values ​​increasing from small to large. Determining the target recharging duration based on the SOC of the storage battery and the power battery includes:

[0026] When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is within the first charge range, the target charging time is determined as the first charging time.

[0027] When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the second charge range, the target charging time is determined to be the second charging time.

[0028] When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the third charge range, the target charging time is determined to be the third charging time.

[0029] Wherein, the first power replenishment duration is less than the second power replenishment duration, and the second power replenishment duration is less than the third power replenishment duration.

[0030] In some embodiments, the state of charge (SOC) of the power battery falls within a corresponding SOC range, which includes a first SOC range, a second SOC range, and a third SOC range, with values ​​increasing from small to large. Determining the target recharging duration based on the SOC of the storage battery and the power battery includes:

[0031] When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is within the first charge range, the target charging time is determined to be the fourth charging time.

[0032] When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is in the second charge range, the target charging time is determined to be the fifth charging time.

[0033] When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is in the third charge range, the target charging time is determined to be the sixth charging time.

[0034] The fourth power replenishment duration is shorter than the fifth power replenishment duration, and the fifth power replenishment duration is shorter than the sixth power replenishment duration.

[0035] In some embodiments, determining the target charging duration based on the state of charge of the storage battery and the state of charge of the power battery further includes:

[0036] In response to the battery's state of charge being greater than the second charge threshold, the target charging duration is determined to be zero.

[0037] In some embodiments, the method further includes:

[0038] In response to disconnecting the electrical connection between the power battery and the storage battery, the state of charge of the power battery is acquired again.

[0039] In response to the state of charge of the power battery being greater than or equal to the recharge threshold, the timer is controlled to start calculating the sleep duration;

[0040] In response to the sleep duration reaching the preset sleep duration, the system enters an active wake-up state;

[0041] In response to the state of charge of the power battery being less than the charging threshold, the timer is controlled to stop timing.

[0042] In some embodiments, obtaining the state of charge of the storage battery and the state of charge of the power battery when in an active wake-up state includes:

[0043] When in active wake-up state, obtain the vehicle fault status and the opening / closing status of the hood, driver's side door lock and trunk;

[0044] When the vehicle is in a fault-free state and the hood, driver's side door lock, and trunk are all closed, the state of charge of the storage battery and the state of charge of the power battery are obtained.

[0045] The beneficial effects of the technical solutions provided in this application include at least the following:

[0046] The battery charging method for new energy vehicles provided in this application is applied to the vehicle controller. Upon active wake-up, it acquires the state of charge (SOC) of the battery and the power battery. If the SOC of the battery is less than a first SOC threshold (i.e., the battery needs charging), it acquires the current ambient temperature and determines a corresponding charging threshold based on the current ambient temperature. When the SOC of the power battery is greater than or equal to this charging threshold, it controls the power battery to charge the battery. This method incorporates ambient temperature into the control of the power battery to charge the battery, replacing the existing method of timed and quantitative charging of the battery. While ensuring the battery is charged, it also considers the power battery's charge level, thus guaranteeing the vehicle's drivability. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A flowchart illustrating a method for replenishing the battery of a new energy vehicle, provided as an embodiment of this application;

[0049] Figure 2 A flowchart illustrating another method for replenishing the battery of a new energy vehicle provided in this application embodiment;

[0050] Figure 3 A flowchart illustrating the method for obtaining the state of charge of the battery and the state of charge of the power battery in an active wake-up state in a battery charging method for a new energy vehicle provided in this application embodiment.

[0051] Figure 4 This is a flowchart illustrating a method for determining a charging threshold corresponding to the current ambient temperature range in a battery charging method for a new energy vehicle, as provided in an embodiment of this application.

[0052] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0055] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0056] With the development of modern transportation and the increasing number of new energy vehicles, new energy vehicle users often find their vehicles idle for extended periods when they have multiple vehicles or are traveling to other places using other means of transportation. New energy vehicles have a large number of components and high static energy consumption. When these vehicles are idle for extended periods, the batteries are needed to power multiple components (such as headlights).

[0057] In related technologies, to ensure the battery's charge level, the vehicle's internal power battery, connected to the battery, is typically used to periodically and quantitatively replenish the battery. However, on the one hand, ambient temperature significantly affects the charging and discharging performance of the power battery. Therefore, under varying ambient temperatures, ensuring the power battery provides power support to the vehicle's power system and guarantees drivability is crucial while periodically and quantitatively replenishing the battery. On the other hand, as the vehicle is used, the battery naturally ages, leading to a decline in the effectiveness of battery replenishment. At this point, periodically and quantitatively replenishing the battery would result in a waste of power.

[0058] In order to solve the technical problems existing in the related technologies, this application provides a method for replenishing the battery of a new energy vehicle. On the one hand, it can ensure that the power battery provides power support to the vehicle's power system while replenishing the battery in a timely and quantitative manner, thus ensuring the vehicle's drivability. On the other hand, it can avoid the waste of power battery replenishment capacity when the battery is naturally aging.

[0059] Figure 1 This is a flowchart illustrating a method for replenishing the battery of a new energy vehicle, as provided in an embodiment of this application.

[0060] See Figure 1 This method is applied to the vehicle controller and includes the following steps:

[0061] Step 101: In the active wake-up state, obtain the state of charge of the storage battery and the state of charge of the power battery.

[0062] Step 102: If the state of charge of the battery is less than the first charge threshold, obtain the current ambient temperature.

[0063] Step 103: Based on the current ambient temperature, determine the charging threshold corresponding to the temperature range where the current ambient temperature is located. The ambient temperature is divided into multiple temperature ranges, and different temperature ranges correspond to different charging thresholds.

[0064] Step 104: In response to the state of charge of the power battery being greater than or equal to the charging threshold corresponding to the current ambient temperature range, control the power battery to charge the storage battery.

[0065] The battery charging method for new energy vehicles provided in this application is applied to the vehicle controller. Upon active wake-up, it acquires the state of charge (SOC) of the battery and the power battery. If the SOC of the battery is less than a first SOC threshold (i.e., the battery needs charging), it acquires the current ambient temperature and determines a corresponding charging threshold based on the current ambient temperature. When the SOC of the power battery is greater than or equal to this charging threshold, it controls the power battery to charge the battery. This method incorporates ambient temperature into the control of the power battery to charge the battery, replacing the existing method of timed and quantitative charging of the battery. While ensuring the battery is charged, it also considers the power battery's charge level, thus guaranteeing the vehicle's drivability.

[0066] In some embodiments, the multiple temperature ranges include a first temperature range, a second temperature range, and a third temperature range divided by temperature values ​​from smallest to largest. Determining the charging threshold corresponding to the temperature range where the current ambient temperature falls, based on the current ambient temperature, includes:

[0067] When the current ambient temperature is within the first temperature range, the first power replenishment threshold is determined.

[0068] When the current ambient temperature is within the second temperature range, the power replenishment threshold is determined as the second power replenishment threshold;

[0069] When the current ambient temperature is in the third temperature range, the power replenishment threshold is determined to be the third power replenishment threshold.

[0070] Among them, the first replenishment threshold is greater than the second replenishment threshold, and the second replenishment threshold is greater than the third replenishment threshold.

[0071] In some embodiments, the method further includes:

[0072] If the current ambient temperature does not fall within a corresponding temperature range, disconnect the electrical connection between the power battery and the storage battery.

[0073] In some embodiments, after controlling the power battery to replenish the storage battery in response to the state of charge of the power battery being greater than or equal to the replenishment threshold corresponding to the current ambient temperature range, the method further includes:

[0074] In response to the control of the power battery to replenish the storage battery, the control timer starts timing;

[0075] In response to the timer reaching the target charging time, the electrical connection between the power battery and the storage battery is disconnected.

[0076] In some embodiments, after the timer starts counting in response to controlling the power battery to replenish the storage battery, the method further includes:

[0077] In response to the start of the control timer to calculate the replenishment duration, the replenishment current is acquired in real time.

[0078] Within the first period after the charging begins, in response to the charging current being less than the current threshold and continuing for a preset period of time, the power battery stops charging the storage battery.

[0079] Within the first time period after the charging begins, in response to the charging current being greater than or equal to the current threshold, the state of charge of the storage battery and the state of charge of the power battery are acquired again.

[0080] The target charging time is determined based on the state of charge of the storage battery and the power battery.

[0081] In some embodiments, the state of charge (SOC) of the power battery falls within a corresponding SOC range, which includes a first SOC range, a second SOC range, and a third SOC range, with values ​​increasing from small to large. Determining the target recharging time based on the SOC of the storage battery and the power battery includes:

[0082] When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is within the first charge range, the target charging time is determined as the first charging time.

[0083] When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the second charge range, the target charging time is determined as the second charging time.

[0084] When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the third charge range, the target charging time is determined to be the third charging time.

[0085] The first power replenishment duration is shorter than the second power replenishment duration, and the second power replenishment duration is shorter than the third power replenishment duration.

[0086] In some embodiments, the state of charge (SOC) of the power battery falls within a corresponding SOC range, which includes a first SOC range, a second SOC range, and a third SOC range, with values ​​increasing from small to large. Determining the target recharging time based on the SOC of the storage battery and the power battery includes:

[0087] When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is within the first charge range, the target charging time is determined to be the fourth charging time.

[0088] When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is in the second charge range, the target charging time is determined to be the fifth charging time.

[0089] When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is in the third charge range, the target charging time is determined to be the sixth charging time.

[0090] Among them, the fourth replenishment time is shorter than the fifth replenishment time, and the fifth replenishment time is shorter than the sixth replenishment time.

[0091] In some embodiments, determining the target charging duration based on the state of charge of the storage battery and the state of charge of the power battery further includes:

[0092] In response to the battery's state of charge being greater than the second charge threshold, the target charging time is set to zero.

[0093] In some embodiments, the method further includes:

[0094] In response to disconnecting the electrical connection between the power battery and the storage battery, the state of charge of the power battery is obtained again.

[0095] In response to the state of charge of the power battery being greater than or equal to the charging threshold, the control timer starts calculating the sleep duration;

[0096] When the sleep duration reaches the preset sleep duration, it enters the active wake-up state;

[0097] When the state of charge of the power battery is less than the charging threshold, the timer is stopped.

[0098] In some embodiments, when in an active wake-up state, acquiring the state of charge of the storage battery and the power battery includes:

[0099] When in active wake-up state, obtain the vehicle fault status and the opening / closing status of the hood, driver's side door lock and trunk;

[0100] When the vehicle is in a fault-free state, and the hood, driver's side door lock, and trunk are all closed, obtain the state of charge of the battery and the state of charge of the power battery.

[0101] Figure 2 A flowchart illustrating another method for replenishing the battery of a new energy vehicle, provided as an embodiment of this application. See also... Figure 2 This method is applied to the vehicle controller and includes the following steps:

[0102] Step 201: In the active wake-up state, obtain the state of charge of the storage battery and the state of charge of the power battery.

[0103] When the vehicle is awakened from hibernation, the vehicle controller detects the state of charge of the battery and the power battery.

[0104] See Figure 3 Step 201 includes the following sub-steps:

[0105] Step 2011: In the active wake-up state, obtain the vehicle fault status and the opening and closing status of the hood, driver's side door lock and trunk.

[0106] Step 2012: With the vehicle in a fault-free state and the hood, driver's side door lock, and trunk all closed, obtain the state of charge of the battery and the state of charge of the power battery.

[0107] When actively awakened, the system first needs to determine the vehicle's fault status and the opening / closing status of the hood, driver's side door lock, and trunk to prevent the power battery from being recharged when components involved in recharging malfunction or when personnel are repairing the vehicle. When the vehicle is in a faulty state or the hood, driver's side door lock, and trunk are in an open state, the system controls the vehicle to re-enter a sleep state and controls the timer to start calculating the sleep duration to prevent safety accidents and protect the safety of relevant personnel.

[0108] Step 202: If the state of charge of the battery is less than the first charge threshold, obtain the current ambient temperature.

[0109] Understandably, when the battery's state of charge is less than the first charge threshold, it indicates that the battery needs to be recharged. When the battery's state of charge is greater than or equal to the first charge threshold, the vehicle is controlled to re-enter a sleep state and the timer is controlled to start calculating the sleep duration, waiting to be woken up next time.

[0110] In some embodiments, the first charge threshold may be 70%.

[0111] Step 203: Based on the current ambient temperature, determine the charging threshold corresponding to the temperature range where the current ambient temperature is located. The ambient temperature is divided into multiple temperature ranges, and different temperature ranges correspond to different charging thresholds.

[0112] In some embodiments, the multiple temperature ranges include a first temperature range, a second temperature range, and a third temperature range, divided by temperature values ​​from small to large.

[0113] See Figure 4 Step 203 includes the following sub-steps:

[0114] Step 2031: When the current ambient temperature is within the first temperature range, determine the power replenishment threshold as the first power replenishment threshold.

[0115] Step 2032: When the current ambient temperature is in the second temperature range, determine the power replenishment threshold as the second power replenishment threshold.

[0116] Step 2033: When the current ambient temperature is in the third temperature range, determine the power replenishment threshold as the third power replenishment threshold.

[0117] Among them, the first replenishment threshold is greater than the second replenishment threshold, and the second replenishment threshold is greater than the third replenishment threshold.

[0118] By determining different charging thresholds for different ambient temperature ranges, it is possible to ensure that the vehicle's power battery can maintain good driving performance after charging the battery under different ambient temperatures.

[0119] In some embodiments, the first temperature range can be [-30°, 10°), the second temperature range can be [10°, 25°), the third temperature range can be [25°, 60°), the first charging threshold can be 35%, the second charging threshold can be 30%, and the third charging threshold can be 25%.

[0120] In some embodiments, if there is no corresponding temperature range in the current ambient temperature, the electrical connection between the power battery and the storage battery is disconnected.

[0121] In some embodiments, the power battery and the storage battery are connected via a DC-DC converter, and the power battery replenishes the storage battery via the DC-DC converter.

[0122] Under extreme ambient temperature conditions, the power battery will no longer be used to recharge the storage battery, to avoid the power battery not having enough power to supply the vehicle for driving when needed.

[0123] Step 204: In response to the state of charge of the power battery being greater than or equal to the charging threshold corresponding to the current ambient temperature range, control the power battery to charge the storage battery.

[0124] The power battery is only controlled to replenish the storage battery when its state of charge is greater than or equal to the charge threshold, so as to ensure that the power battery provides power support to the vehicle's power system and ensure the vehicle's driving performance.

[0125] Step 205: In response to the control of the power battery to replenish the storage battery, the control timer starts timing.

[0126] After the power replenishment begins, the control timer starts calculating the power replenishment duration.

[0127] Step 206: After the first time interval following the start of charging, in response to the charging current being greater than or equal to the current threshold, the state of charge of the storage battery and the state of charge of the power battery are acquired again.

[0128] Understandably, if the charging current is greater than or equal to the current threshold after the charging starts and the charging time reaches the first duration, it indicates that the battery is only slightly aged or has not yet shown signs of natural aging. In this case, controlling the power battery to charge the battery will not waste the power battery's energy.

[0129] In some embodiments, the first duration can be 5 minutes and the current threshold can be 1A.

[0130] Step 207: Determine the target charging time based on the state of charge of the storage battery and the state of charge of the power battery.

[0131] Understandably, the determination of the target charging time needs to be based on the state of charge of the storage battery and the power battery.

[0132] Step 208: In response to the timer reaching the target charging time, disconnect the electrical connection between the power battery and the storage battery.

[0133] After the target charging time is reached, the electrical connection between the power battery and the storage battery is disconnected, that is, the power battery stops charging the storage battery.

[0134] In some embodiments, the target charging time can be 60 minutes.

[0135] In some embodiments, between steps 205 and 208, the method further provides a step to avoid ineffective charging due to battery aging, which is as follows:

[0136] Step 1: In response to the control timer starting to calculate the replenishment duration, the replenishment current is acquired in real time.

[0137] Step 2: Within the first time period after the charging begins, in response to the charging current being less than the current threshold and continuing for a preset time, disconnect the electrical connection between the power battery and the storage battery.

[0138] In some embodiments, the duration can be 1 minute.

[0139] Understandably, by setting a current threshold, if the detected charging current is less than this threshold and the duration of the current being less than this threshold reaches a preset time, the vehicle's battery is determined to have experienced severe natural aging. Therefore, it is necessary to disconnect the electrical connection between the power battery and the storage battery, stop charging, and avoid wasting the power battery's charge.

[0140] In some embodiments, the step of determining the target charging duration in step 207 is divided into three cases, as follows:

[0141] Before describing these two scenarios, we will first divide the state of charge of the power battery into multiple charge ranges.

[0142] In some embodiments, the state of charge of the power battery falls within a corresponding charge range. The charge range includes a first charge range, a second charge range, and a third charge range with values ​​increasing from small to large. The first charge range can be [recharge threshold, 40%), the second charge range can be [40%, 60%), and the third charge range can be [60%, 100%).

[0143] The following describes the steps for determining the target charging time based on the three charge ranges of the power battery, divided into three cases:

[0144] Scenario 1:

[0145] Step 1: When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is within the first charge range, determine the target charging time as the first charging time.

[0146] Step 2: When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the second charge range, the target charging time is determined as the second charging time.

[0147] Step 3: When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the third charge range, the target charging time is determined as the third charging time.

[0148] The first power replenishment duration is shorter than the second power replenishment duration, and the second power replenishment duration is shorter than the third power replenishment duration.

[0149] Understandably, when the battery's state of charge is very low, it is necessary to control the power battery to replenish the battery's charge. At the same time, the power battery's state of charge should be considered. The higher the power battery's state of charge, the more charge it can use to replenish the battery, and therefore the longer the target replenishment time.

[0150] In some embodiments, the first charging time can be 20 minutes, the second charging time can be 40 minutes, and the third charging time can be 60 minutes.

[0151] Scenario 2:

[0152] Step 1: When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is within the first charge range, the target charging time is determined to be the fourth charging time.

[0153] Step 2: When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the second charge range, the target charging time is determined to be the fifth charging time.

[0154] Step 3: If the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the third charge range, the target charging time is determined to be the sixth charging time.

[0155] Among them, the fourth replenishment time is shorter than the fifth replenishment time, and the fifth replenishment time is shorter than the sixth replenishment time.

[0156] Understandably, when the state of charge of the battery is low, it is necessary to control the power battery to replenish the battery's charge. At the same time, the state of charge of the power battery should be considered. The higher the state of charge of the power battery, the more charge it can use to replenish the battery, and therefore the longer the target replenishment time.

[0157] In some embodiments, the second charge threshold can be 90%, the fourth charging duration can be 15 minutes, the fifth charging duration can be 30 minutes, and the sixth charging duration can be 45 minutes.

[0158] Scenario 3:

[0159] In some embodiments, in response to the battery's state of charge being greater than a second charge threshold, the target charging duration is determined to be zero.

[0160] It is understandable that when the battery's state of charge is at a high level, there is no need for the power battery to recharge the battery, so the target recharging time is determined to be zero.

[0161] Step 209: In response to disconnecting the electrical connection between the power battery and the storage battery, the state of charge of the power battery is obtained again.

[0162] Step 210: In response to the state of charge of the power battery being greater than or equal to the charging threshold, the control timer starts calculating the sleep duration.

[0163] Understandably, after disconnecting the electrical connection between the power battery and the storage battery, it is necessary to check the state of charge of the power battery again to determine how much remaining power the power battery has. If the remaining state of charge is greater than or equal to the charging threshold, it means that the power battery can still be used to charge the storage battery next time. Therefore, the timer is controlled to start calculating the sleep time again.

[0164] Step 211: In response to the sleep duration reaching the preset sleep duration, enter the active wake-up state.

[0165] In some embodiments, the hibernation period can be 12 hours.

[0166] Step 212: In response to the state of charge of the power battery being less than the charging threshold, the timer is controlled to stop counting.

[0167] Understandably, after disconnecting the electrical connection between the power battery and the storage battery, it is necessary to check the state of charge of the power battery again to determine how much remaining power the power battery has. If the remaining state of charge is less than the charging threshold, it means that the power battery cannot be used to charge the storage battery next time, otherwise it will affect the driving performance of the vehicle. Therefore, the timer is no longer controlled to perform timing and timed wake-up, which also reduces the power loss of the power battery caused by frequent vehicle wake-up.

[0168] In some embodiments, the vehicle controller wakes up the vehicle CAN network by sending a network management message. Then, the battery management system of the battery sends the battery state of charge information and fault status information to the body controller in real time via the LIN bus. The body controller then sends the battery state of charge information and fault status information to the vehicle controller via the CAN bus. The battery management system of the power battery directly sends the power battery state of charge and fault status information to the vehicle controller via the CAN bus.

[0169] In summary, the battery charging method for new energy vehicles provided in this application is applied to the vehicle controller. Upon active wake-up, it acquires the state of charge (SOC) of both the battery and the power battery. If the SOC of the battery is less than a first SOC threshold (i.e., the battery needs charging), it acquires the current ambient temperature and determines a corresponding charging threshold based on the ambient temperature. When the SOC of the power battery is greater than or equal to this charging threshold, it controls the power battery to charge the battery. This method incorporates ambient temperature into the control of the power battery's charging of the battery, replacing the existing method of timed and quantitative charging of the battery. While ensuring the battery is charged, it also considers the power battery's charge level, thus guaranteeing the vehicle's drivability.

[0170] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0171] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0172] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for replenishing the battery of a new energy vehicle, characterized in that, Applied to a vehicle controller, the method includes: When in active wake-up state, the state of charge of the storage battery and the state of charge of the power battery are obtained. If the state of charge of the battery is less than a first charge threshold, the current ambient temperature is obtained. Based on the current ambient temperature, the charging threshold corresponding to the temperature range where the current ambient temperature is located is determined, wherein the ambient temperature is divided into multiple temperature ranges, and different temperature ranges correspond to different charging thresholds. In response to the state of charge of the power battery being greater than or equal to the charging threshold corresponding to the temperature range of the current ambient temperature, the power battery is controlled to charge the storage battery. The state of charge (SOC) of the power battery falls within the corresponding SOC range. Determining the target recharging time based on the SOC of the storage battery and the state of charge of the power battery includes: When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is within the first charge range, the target charging time is the first charging time. When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the second charge range, the target charging time is the second charging time. When the state of charge of the storage battery is less than or equal to the first charge threshold and the state of charge of the power battery is in the third charge interval, the target charging time is the third charging time, wherein the first charging time is less than the second charging time, the second charging time is less than the third charging time, and the values ​​of the first charge interval, the second charge interval, and the third charge interval are in ascending order; In response to the battery being charged for a target charging time, the electrical connection between the power battery and the storage battery is disconnected.

2. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, The multiple temperature ranges include a first temperature range, a second temperature range, and a third temperature range divided by temperature values ​​from smallest to largest. Determining the charging threshold corresponding to the temperature range where the current ambient temperature falls, based on the current ambient temperature, includes: When the current ambient temperature is within the first temperature range, the power replenishment threshold is determined to be the first power replenishment threshold; When the current ambient temperature is within the second temperature range, the power replenishment threshold is determined to be the second power replenishment threshold; When the current ambient temperature is within the third temperature range, the power replenishment threshold is determined to be the third power replenishment threshold; Wherein, the first replenishment threshold is greater than the second replenishment threshold, and the second replenishment threshold is greater than the third replenishment threshold.

3. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, The method further includes: If the current ambient temperature does not fall within a corresponding temperature range, disconnect the electrical connection between the power battery and the storage battery.

4. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, After controlling the power battery to recharge the storage battery in response to the state of charge of the power battery being greater than or equal to the recharge threshold corresponding to the current ambient temperature range, the method further includes: In response to the control of the power battery to replenish the storage battery, the control timer starts timing; In response to the timer reaching the target charging duration, the electrical connection between the power battery and the storage battery is disconnected.

5. The method for replenishing the battery of a new energy vehicle according to claim 4, characterized in that, After the timer starts counting in response to the control of the power battery to replenish the storage battery, the method further includes: In response to the start of the control timer calculating the replenishment duration, the replenishment current is acquired in real time; Within the first period after the charging begins, in response to the charging current being less than the current threshold and lasting for a preset period of time, the electrical connection between the power battery and the storage battery is disconnected. After the first duration following the start of charging, in response to the charging current being greater than or equal to the current threshold, the state of charge of the storage battery and the state of charge of the power battery are acquired again. The target charging time is determined based on the state of charge of the storage battery and the state of charge of the power battery.

6. The method for replenishing the battery of a new energy vehicle according to claim 5, characterized in that, The state of charge (SOC) of the power battery falls within the corresponding SOC range. Determining the target recharging duration based on the SOC of the storage battery and the state of charge of the power battery includes: When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is within the first charge range, the target charging time is determined to be the fourth charging time. When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is in the second charge range, the target charging time is determined to be the fifth charging time. When the state of charge of the storage battery is greater than the first charge threshold and less than or equal to the second charge threshold, and the state of charge of the power battery is in the third charge range, the target charging time is determined to be the sixth charging time. The fourth power replenishment duration is shorter than the fifth power replenishment duration, and the fifth power replenishment duration is shorter than the sixth power replenishment duration.

7. The method for replenishing the battery of a new energy vehicle according to claim 6, characterized in that, Determining the target charging duration based on the state of charge of the storage battery and the state of charge of the power battery further includes: In response to the battery's state of charge being greater than the second charge threshold, the target charging duration is determined to be zero.

8. The method for replenishing the battery of a new energy vehicle according to claim 7, characterized in that, The method further includes: In response to disconnecting the electrical connection between the power battery and the storage battery, the state of charge of the power battery is acquired again. In response to the state of charge of the power battery being greater than or equal to the recharge threshold, the timer is controlled to start calculating the sleep duration; In response to the sleep duration reaching the preset sleep duration, the system enters an active wake-up state; In response to the state of charge of the power battery being less than the charging threshold, the timer is controlled to stop timing.

9. The method for replenishing the battery of a new energy vehicle according to claim 1, characterized in that, In the active wake-up state, obtaining the state of charge of the storage battery and the power battery includes: When in active wake-up state, obtain the vehicle fault status and the opening / closing status of the hood, driver's side door lock and trunk; When the vehicle is in a fault-free state and the hood, driver's side door lock, and trunk are all closed, the state of charge of the storage battery and the state of charge of the power battery are obtained.

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