Battery charging method, device, equipment and storage medium

Abstract

The application relates to a battery charging method, device, equipment and storage medium, and relates to the technical field of automobiles. The method comprises the following steps: when a vehicle is powered off and a first preset time period elapses, a battery detection unit of the vehicle is used to acquire a first ambient temperature T1 and a first voltage U1 of a low-voltage storage battery of the vehicle; a body control unit BCM of the vehicle is used to determine a state of charge SOC of the low-voltage storage battery according to the first ambient temperature T1 and the first voltage U1 of the low-voltage storage battery; when it is determined that the SOC of the low-voltage storage battery is less than a first preset power threshold, a high-voltage storage battery charges the low-voltage storage battery through a direct-current converter DCDC, and the first preset power threshold is the SOC of a to-be-charged state corresponding to the low-voltage storage battery. Therefore, the low-voltage storage battery can be charged, long-term storage of the vehicle is met, and the SOC of the low-voltage storage battery is determined by using a battery sensor which is high in cost and not configured in many vehicles.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and specifically to a method, apparatus, device, and storage medium for replenishing a battery. Background Technology

[0002] With the development of automobiles, current technology allows for the periodic activation of battery sensors via a real-time clock (RTC) module. This enables the system to receive information about the state of charge (SOC) of the onboard low-voltage battery (low-voltage storage). When the SOC falls below a preset threshold, the vehicle control system charges the battery. Alternatively, the battery management system can detect the battery voltage to determine its SOC, and if it falls below a preset threshold, the vehicle control system can replenish the battery's charge.

[0003] However, battery sensors are currently expensive, resulting in high costs, and many vehicles do not have them. Furthermore, the voltage detection accuracy of the power battery management system is relatively low, leading to low accuracy in obtaining the state of charge of the vehicle's low-voltage battery. Summary of the Invention

[0004] The purpose of this invention is to provide a battery charging method, apparatus, device, and storage medium to solve the technical problems of high cost of battery sensors and low voltage detection accuracy of power battery management systems used in related technologies. The technical solution of this application is as follows:

[0005] According to a first aspect of this application, a battery charging method is provided, comprising: after a first preset time has elapsed since the vehicle has been powered off, obtaining a first ambient temperature T1 and a first voltage U1 of the low-voltage battery of the vehicle through the vehicle's battery detection unit; determining the state of charge (SOC) of the low-voltage battery through the vehicle's body control unit (BCM) based on the first ambient temperature T1 and the first voltage U1, wherein the supply voltage of the low-voltage battery is lower than a preset voltage value; and when it is determined that the SOC of the low-voltage battery is less than a first preset charge threshold, the high-voltage battery charges the low-voltage battery through a DC-DC converter (DCDC), wherein the first preset charge threshold is the SOC of the low-voltage battery corresponding to the state to be charged.

[0006] Based on the aforementioned technical means, this application can determine the State of Charge (SOC) of the low-voltage battery at regular intervals based on the ambient temperature and voltage of the low-voltage battery after the vehicle is powered off. When the SOC of the low-voltage battery is determined to be less than the SOC required for recharging, the low-voltage battery is recharged. This allows for long-term storage of the vehicle without increasing battery capacity, avoiding the problem of the vehicle failing to start due to excessively low battery charge after prolonged storage. Simultaneously, it avoids determining the SOC of the low-voltage battery using costly battery sensors, which are not equipped in many vehicles.

[0007] In one possible implementation, before the high-voltage battery replenishes the low-voltage battery via the DC-DC converter, the method further includes: sending a replenishment signal to the vehicle's power control unit (PCU) via the BCM; and, if the PCU determines that the vehicle's high-voltage system is normal, sending a replenishment signal to the vehicle's DC-DC converter via the PCU.

[0008] Based on the above technical means, this application can ensure that the low-voltage battery is recharged when the high-voltage system is normal, and avoid the problem that the low-voltage battery cannot be recharged through the abnormal high-voltage system when the high-voltage system is abnormal.

[0009] In one possible implementation, the method further includes: after the vehicle is powered off and a second preset time has elapsed, obtaining the second ambient temperature T2 and the second voltage U2 of the low-voltage battery through a battery detection unit, wherein the second preset time is less than the first preset time; and determining the static SOC of the low-voltage battery based on the second ambient temperature T2 and the second voltage U2 of the low-voltage battery through the TU-SOC relationship curve of the low-voltage battery, wherein the TU-SOC relationship curve is used to indicate the voltage and static SOC of the low-voltage battery at different ambient temperatures T.

[0010] Based on the above technical means, after the vehicle is powered off and a second preset time has elapsed, the vehicle is in a network sleep state, and at this time the ambient temperature and voltage of the low-voltage battery are stable. Based on the ambient temperature and voltage of the low-voltage battery at this time, the static SOC of the low-voltage battery is determined, which improves the accuracy of the static SOC of the low-voltage battery.

[0011] In one possible implementation, the state of charge (SOC) of the low-voltage battery is determined by the vehicle's body control unit (BCM) based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery. This includes: determining the load SOC of the low-voltage battery using a T-SOC-U relationship table, which indicates the voltage of the low-voltage battery under different ambient temperatures T and different load SOCs; and determining the SOC of the low-voltage battery using the BCM based on the static SOC and the load SOC of the low-voltage battery.

[0012] According to the above technical means, when determining the SOC of a low-voltage battery through the BCM based on the ambient temperature and voltage of the low-voltage battery, it is necessary to wake up the BCM, which will generate current to drive the BCM, thus increasing the voltage of the low-voltage battery. Based on the ambient temperature and voltage of the low-voltage battery at this time, the load SOC of the low-voltage battery is determined, thereby improving the accuracy of the load SOC of the low-voltage battery.

[0013] In one possible implementation, the high-voltage system includes a high-voltage battery. When the PCU determines that the vehicle's high-voltage system is normal, the PCU sends a charging signal to the vehicle's DC-DC converter, including: sending a charging signal to the vehicle's high-voltage battery control unit (BMS); based on the charging signal, obtaining the SOC and discharge power of the vehicle's high-voltage battery through the BMS, wherein the supply voltage of the high-voltage battery is greater than or equal to a preset voltage value; when the SOC of the high-voltage battery is greater than a second preset charge threshold and the discharge power of the high-voltage battery is greater than a preset discharge power, the PCU sends a charging signal to the vehicle's DC-DC converter, wherein the second preset charge threshold is the minimum SOC for the high-voltage battery to drive the vehicle, and the preset discharge power is the minimum discharge power for the high-voltage battery to drive the vehicle.

[0014] Based on the above technical means, this application can avoid the problem that when the SOC corresponding to the high-voltage battery is less than or equal to the minimum SOC of the driving vehicle, and the discharge power corresponding to the high-voltage battery is less than or equal to the minimum discharge power of the driving vehicle, the low-voltage battery is still charged by the high-voltage battery, resulting in the inability to drive the vehicle by the high-voltage battery.

[0015] In one possible implementation, the method further includes: when the high-voltage battery fails to replenish the low-voltage battery via DC-DC converter, determining whether the SOC of the low-voltage battery is less than a third preset power threshold, the third preset power threshold being the minimum SOC required for the low-voltage battery to power up the vehicle; when it is determined that the SOC of the low-voltage battery is less than the third preset power threshold, sending an alarm message to the terminal device via BCM and battery detection unit, the alarm message being used to notify the user that the SOC of the low-voltage battery of the vehicle is less than the third preset power threshold.

[0016] Based on the aforementioned technical means, this application can promptly remind the user when the SOC of the vehicle's low-voltage battery is lower than the minimum SOC required for the vehicle to be powered on, thus preventing the vehicle from failing to power on and causing the user to be unable to use the vehicle.

[0017] According to a second aspect of this application, a battery charging device is provided, comprising an acquisition unit, a determination unit, and a processing unit; the acquisition unit is configured to acquire, through the vehicle's battery detection unit, a first ambient temperature T1 and a first voltage U1 of the vehicle's low-voltage battery after a first preset time has elapsed since the vehicle was powered off; the determination unit is configured to determine the state of charge (SOC) of the low-voltage battery through the vehicle's body control unit (BCM) based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, wherein the supply voltage of the low-voltage battery is lower than a preset voltage value; the processing unit is configured to, when the SOC of the low-voltage battery is determined to be less than a first preset charge threshold, use a high-voltage battery to charge the low-voltage battery through a DC-DC converter (DCDC), wherein the first preset charge threshold is the SOC of the low-voltage battery corresponding to the state to be charged.

[0018] In one possible implementation, the battery charging device further includes a transmitting unit, which is used to send a charging signal to the vehicle's power control unit (PCU) via the BCM; the transmitting unit is also used to send a charging signal to the vehicle's DC-DC converter via the PCU if the PCU determines that the vehicle's high-voltage system is normal.

[0019] In one possible implementation, the acquisition unit is further configured to acquire, through the battery detection unit, the second ambient temperature T2 and the second voltage U2 of the low-voltage battery after a second preset time has elapsed since the vehicle is powered off, wherein the second preset time is less than the first preset time; the determination unit is further configured to determine the static SOC of the low-voltage battery based on the second ambient temperature T2 and the second voltage U2 of the low-voltage battery, through the TU-SOC relationship curve of the low-voltage battery, wherein the TU-SOC relationship curve is used to indicate the voltage and static SOC of the low-voltage battery at different ambient temperatures T.

[0020] In one possible implementation, the determining unit is further configured to determine the load SOC of the low-voltage battery based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, using a T-SOC-U relationship correspondence table of the low-voltage battery, wherein the T-SOC-U relationship correspondence table is used to indicate the voltage of the low-voltage battery under different ambient temperatures T and different load SOCs; the determining unit is further configured to determine the SOC of the low-voltage battery through the BCM based on the static SOC and load SOC of the low-voltage battery.

[0021] In one possible implementation, the high-voltage system includes a high-voltage battery; a transmitting unit, further configured to transmit a charging signal to the vehicle's high-voltage battery control unit (BMS) via a PCU; an acquiring unit, further configured to acquire the state of charge (SOC) and discharge power of the vehicle's high-voltage battery via the BMS based on the charging signal, wherein the supply voltage of the high-voltage battery is greater than or equal to a preset voltage value; the transmitting unit is further configured to transmit a charging signal to the vehicle's DC-DC converter via the PCU when the SOC of the high-voltage battery is greater than a second preset charge threshold and the discharge power of the high-voltage battery is greater than a preset discharge power, wherein the second preset charge threshold is the minimum SOC for the high-voltage battery to drive the vehicle, and the preset discharge power is the minimum discharge power for the high-voltage battery to drive the vehicle.

[0022] In one possible implementation, the determining unit is further configured to determine whether the SOC of the low-voltage battery is less than a third preset power threshold when the high-voltage battery fails to replenish the low-voltage battery via DC-DC converter. The third preset power threshold is the minimum SOC of the low-voltage battery required for the vehicle to be powered on. The sending unit is further configured to send an alarm message to the terminal device via BCM and battery detection unit when it is determined that the SOC of the low-voltage battery is less than the third preset power threshold. The alarm message is used to remind the user that the SOC of the low-voltage battery of the vehicle is less than the third preset power threshold.

[0023] According to a third aspect provided in this application, an electronic device is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to execute instructions to implement the method of the first aspect described above and any possible implementation thereof.

[0024] According to a fourth aspect provided in this application, a computer-readable storage medium is provided that, when the instructions in the computer-readable storage medium are executed by a processor of an electronic device, enables the electronic device to perform the methods described in the first aspect and any possible implementation thereof.

[0025] According to the fifth aspect provided in this application, a vehicle is provided, including: a battery charging device for implementing the first aspect described above and any possible implementation thereof.

[0026] According to the sixth aspect provided in this application, a computer program product is provided, the computer program product including computer instructions, which, when executed on an electronic device, cause the electronic device to perform the method described in the first aspect and any possible implementation thereof.

[0027] Therefore, the above-mentioned technical features of this application have the following beneficial effects:

[0028] (1) Without increasing the battery capacity, the vehicle can be stored for a long time without the problem of the low-voltage battery remaining too low after long-term storage, which would prevent the vehicle from starting. At the same time, the use of battery sensors, which are expensive and not equipped in many vehicles, to determine the state of charge (SOC) of the low-voltage battery should be avoided.

[0029] (2) It can ensure that the low-voltage battery is charged when the high-voltage system is normal, and avoid the problem that the low-voltage battery cannot be charged through the abnormal high-voltage system when the high-voltage system is abnormal.

[0030] (3) It can improve the accuracy of the static SOC of a low-voltage battery.

[0031] (4) It can improve the accuracy of the determined load SOC of low-voltage batteries.

[0032] (5) It can avoid the problem that the low-voltage battery is still charged by the high-voltage battery when the SOC corresponding to the high-voltage battery is less than or equal to the minimum SOC of the driving vehicle and the discharge power corresponding to the high-voltage battery is less than or equal to the minimum discharge power of the driving vehicle, which would prevent the vehicle from being driven by the high-voltage battery.

[0033] (6) It can promptly remind users when the SOC of the vehicle's low-voltage battery is lower than the minimum SOC required for the vehicle to be powered on, thus preventing the vehicle from being unable to be powered on and causing users to be unable to use the vehicle.

[0034] It should be noted that the technical effects of any of the implementation methods in aspects two through six can be found in the technical effects of the corresponding implementation methods in aspect one, and will not be repeated here.

[0035] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application, and do not constitute an undue limitation of this application.

[0037] Figure 1 This is a schematic diagram of a battery charging system according to an exemplary embodiment;

[0038] Figure 2 This is a flowchart illustrating a battery charging method according to an exemplary embodiment;

[0039] Figure 3 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment;

[0040] Figure 4 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment;

[0041] Figure 5 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment;

[0042] Figure 6 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment;

[0043] Figure 7 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment;

[0044] Figure 8 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment;

[0045] Figure 9 This is a system logic diagram illustrating battery charging according to an exemplary embodiment;

[0046] Figure 10 This is a block diagram illustrating a battery charging device according to an exemplary embodiment;

[0047] Figure 11 This is a block diagram illustrating an electronic device according to an exemplary embodiment. Detailed Implementation

[0048] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0050] With the development of automotive technology, the market share of new energy vehicles is growing, facing numerous opportunities while also encountering various problems and drawbacks. New energy vehicles are equipped with more features than traditional gasoline vehicles. Specifically, new energy vehicles offer more functions after parking, such as fresh air systems, over-the-air (OTA) technology, remote mobile phone functionality, intelligent welcome functions, and 360-degree panoramic live streaming functions. This results in higher power consumption after the vehicle is powered off compared to traditional gasoline vehicles. Furthermore, new energy vehicles require additional high-voltage controllers, such as the vehicle control unit (VCU), power control unit (PCU), and on-board charger (OBC), leading to higher overall current draw than traditional gasoline vehicles.

[0051] When a vehicle is parked, the high-voltage battery needs to be de-energized to ensure the safety of the entire vehicle. Therefore, after parking, the 12V lead-acid battery (i.e., the low-voltage battery) bears the power consumption for functional use and the vehicle's dark current consumption, resulting in a greater power supply pressure on the 12V lead-acid battery of new energy vehicles compared to traditional fuel vehicles. Simultaneously, when starting the vehicle after parking, the 12V lead-acid battery also needs to supply power to the low-voltage portion of the vehicle. To ensure the reliability of starting the vehicle, the capacity of the 12V lead-acid battery needs to be larger than that of traditional fuel vehicles. However, due to the cost and weight of the 12V lead-acid battery, its capacity cannot be increased indefinitely. Therefore, it is necessary to meet the long-term storage requirements of the entire vehicle while keeping the 12V lead-acid battery capacity constant or only slightly increased.

[0052] Currently, the battery sensor can be periodically woken up via the RTC module to receive the battery level information of the vehicle's low-voltage battery. When the battery level is below a preset threshold, the vehicle control system charges the battery. Alternatively, the battery management system can detect the battery voltage to obtain the state of charge (SOC). When the SOC is below a preset threshold, the vehicle control system replenishes the battery. However, battery sensors are currently expensive, resulting in high costs, and many vehicles do not have them. Furthermore, the voltage detection accuracy of the battery management system is relatively low, leading to low accuracy in obtaining the SOC information.

[0053] For ease of understanding, the battery charging method provided in this application will be described in detail below with reference to the accompanying drawings.

[0054] The battery charging method provided in this application embodiment can be applied to battery charging systems. Figure 1 This is a schematic diagram illustrating the structure of a battery charging system according to an exemplary embodiment. Figure 1 As shown, the battery charging system 10 includes: a battery detection unit 11, a low-voltage battery 12, a body control unit 13, a power control unit 14, a DC-DC converter 15, a high-voltage battery control unit 16, a high-voltage battery 17, and a terminal device 18.

[0055] The battery detection unit 11 is used to acquire the first ambient temperature T1 and the first voltage U1 of the low-voltage battery 12 of the vehicle after a first preset time period following the vehicle power-off, acquire the second ambient temperature T2 and the second voltage U2 of the low-voltage battery 12 of the vehicle after a second preset time period following the vehicle power-off, and send alarm information to the terminal device 18; the low-voltage battery 12 is used to send the first ambient temperature T1, the first voltage U1, the second ambient temperature T2, and the second voltage U2 to the battery detection unit 11.

[0056] The body control module (BCM) 13 is used to obtain the first ambient temperature T1 and the first voltage U1 of the low-voltage battery 12 of the vehicle through the vehicle's battery detection unit 11, determine the state of charge (SOC) of the low-voltage battery 12 based on the first ambient temperature T1 and the first voltage U1, send a charging signal to the vehicle's DC-DC converter 15 through the power control unit 14, charge the low-voltage battery 12 through the DC-DC converter 15, send a charging signal to the vehicle's high-voltage battery management system (BMS) 16 through the power control unit 14, determine whether there is a fault in the high-voltage electrical equipment through the power control unit 14, and send alarm information to the terminal device 18 through the battery detection unit 11.

[0057] The power control unit 14 is used to determine that the vehicle's high-voltage system is normal, send a charging signal to the vehicle's DC-DC converter 15, send a charging signal to the vehicle's high-voltage battery control unit 16, obtain the SOC and discharge power of the vehicle's high-voltage battery 17 through the high-voltage battery control unit 16, and determine whether there is a fault in the high-voltage electrical equipment; the DC-DC converter 15 is used to charge the low-voltage battery 12; the high-voltage battery control unit 16 is used to obtain the SOC and discharge power of the vehicle's high-voltage battery 17; the high-voltage battery 17 is used to send the SOC and discharge power to the power control unit 14 through the high-voltage battery control unit 16.

[0058] The terminal device 18 is used to receive alarm information from the battery detection unit 11 and display and remind users, so as to replenish the low-voltage battery through the battery sensor 11, low-voltage battery 12, body control unit 13, power control unit 14, DC converter 15, high-voltage battery control unit 16, high-voltage battery 17 and terminal device 18.

[0059] Figure 2 This is a flowchart illustrating a battery charging method according to an exemplary embodiment, such as... Figure 2 As shown, the battery charging method includes the following steps:

[0060] S201. After the vehicle is powered off and a first preset time has elapsed, the first ambient temperature T1 and the first voltage U1 of the vehicle's low-voltage battery are obtained through the vehicle's battery detection unit.

[0061] Optionally, the battery detection unit can monitor the first ambient temperature T1 and the first voltage U1 of the vehicle's low-voltage battery in real time. After the vehicle is powered off, the vehicle's BCM can automatically wake up after a first preset time period and send the first ambient temperature T1 and the first voltage U1 of the low-voltage battery to the BCM via the controller area network (CAN) bus of the battery detection unit. The battery detection unit can be an in-vehicle entertainment unit (THU).

[0062] For example, the first preset duration can be any reasonable duration such as 12h, 24h, or 48h.

[0063] S202. Based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, determine the state of charge (SOC) of the low-voltage battery through the vehicle's BCM.

[0064] Among them, the supply voltage of the low-voltage battery is lower than the preset voltage value.

[0065] S203. When it is determined that the SOC of the low-voltage battery is less than the first preset power threshold.

[0066] S204, the high-voltage battery replenishes the low-voltage battery via DC-DC converter.

[0067] The first preset power threshold (i.e., SOC1) is the SOC of the low-voltage battery in the state of needing to be recharged.

[0068] Figure 3 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment, such as... Figure 3 As shown, before the method of "recharging the low-voltage battery with DC-DC converter" in step S204 above, the following steps are also included:

[0069] S301, Sends a power replenishment signal to the vehicle's power control unit (PCU) via the BCM.

[0070] Optionally, a power replenishment signal can be generated by the BCM and sent to the vehicle's PCU via the BCM.

[0071] S302. If the PCU determines that the vehicle's high-voltage system is normal, send a power replenishment signal to the vehicle's DC-DC converter via the PCU.

[0072] Figure 4 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment, such as... Figure 4 As shown, the battery charging method also includes the following steps:

[0073] S401. After the vehicle is powered off and a second preset time has elapsed, the battery detection unit obtains the second ambient temperature T2 and the second voltage U2 of the low-voltage battery.

[0074] The second preset duration is shorter than the first preset duration.

[0075] For example, the second preset duration can be any reasonable value such as 3h, 4h, 5h.

[0076] S402. Based on the second ambient temperature T2 and the second voltage U2 of the low-voltage battery, the static SOC of the low-voltage battery is determined by the corresponding curve of the TU-SOC relationship of the low-voltage battery.

[0077] The TU-SOC relationship curve is used to indicate the voltage and static SOC of low-voltage batteries at different ambient temperatures T.

[0078] Optionally, the vehicle's low-voltage battery can be tested in combination at different preset ambient temperatures T to obtain the static state of charge (SOC) curve and voltage (U) curve of the low-voltage battery. Based on the curves of different ambient temperatures T, static SOC, and voltage U, a TU-SOC relationship curve for the low-voltage battery can be formed. The TU-SOC relationship curve can be integrated into the BCM (Battery Management System).

[0079] For example, the preset ambient temperatures T can be -30℃, 25℃, and 75℃.

[0080] Figure 5 This is a flowchart illustrating yet another battery charging method according to an exemplary embodiment, such as... Figure 5 As shown, the method in step S202 above specifically includes the following steps:

[0081] S501. Based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, determine the load SOC of the low-voltage battery through the T-SOC-U relationship correspondence table of the low-voltage battery.

[0082] The T-SOC-U relationship table is used to indicate the voltage of low-voltage batteries under different ambient temperatures T and different load SOCs.

[0083] Optionally, the vehicle's current I can be pre-collected when the BCM wakes up. Then, the vehicle's low-voltage battery is tested on a battery charger under preset ambient temperatures T and different load SOCs using current I. This yields the low-voltage battery voltage U over a preset time period. Based on different ambient temperatures T, different load SOCs, and the low-voltage battery voltage U over the preset time period, a T-SOC-U relationship table is created. This T-SOC-U relationship table can be integrated into the BCM. The first voltage U1 of the low-voltage battery is the voltage of the low-voltage battery over the preset time period.

[0084] For example, the preset ambient temperature T can be -30℃, 25℃, or 75℃, the preset load SOC can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 100%, and the preset time period can be any reasonable value such as 8ms, 10ms, or 12ms.

[0085] S502. Determine the SOC of the low-voltage battery using the BCM based on the static SOC and load SOC of the low-voltage battery.

[0086] Optionally, the SOC of the low-voltage battery can be (static SOC + load SOC) / 2.

[0087] Figure 6 This is a flowchart illustrating another battery charging method according to an exemplary embodiment, wherein the high-voltage system includes a high-voltage battery, such as... Figure 6 As shown, the method in step S302 above specifically includes the following steps:

[0088] S601, Send a power replenishment signal to the vehicle's BMS via the PCU.

[0089] S602. Based on the charging signal, obtain the SOC and discharge power of the vehicle's high-voltage battery through the BMS.

[0090] Among them, the power supply voltage of the high-voltage battery is greater than or equal to the preset voltage value.

[0091] S603. When the SOC corresponding to the high-voltage battery is greater than the second preset power threshold and the discharge power corresponding to the high-voltage battery is greater than the preset discharge power, a charging signal is sent to the vehicle's DC-DC converter via the PCU.

[0092] The second preset power threshold is the minimum SOC of the high-voltage battery-driven vehicle, and the preset discharge power is the minimum discharge power of the high-voltage battery-driven vehicle.

[0093] Figure 7This is a flowchart illustrating another battery charging method according to an exemplary embodiment. The high-voltage system also includes high-voltage electrical equipment, such as... Figure 7 As shown, the method in step S302 above specifically includes the following steps:

[0094] S701. Use the PCU to determine if there is a fault in the high-voltage electrical equipment.

[0095] S702. When it is determined that there is no fault in the high-voltage electrical equipment, a power replenishment signal is sent to the vehicle's DC-DC converter.

[0096] Optionally, the DC-DC converter can charge the low-voltage battery according to a specific voltage and preset charging time. When the SOC of the low-voltage battery is greater than a fourth preset power threshold, the charging will stop and the vehicle network will enter a dormant state.

[0097] For example, the fourth preset power threshold can be a reasonable value such as 90% or 95%.

[0098] Based on the above-mentioned technical means, this application can ensure that the low-voltage battery can be recharged when the high-voltage electrical equipment is fault-free, thus avoiding the problem that the low-voltage battery cannot be recharged through the faulty high-voltage electrical equipment when the high-voltage electrical equipment fails.

[0099] Figure 8 This is a flowchart illustrating another battery charging method according to an exemplary embodiment. The high-voltage system also includes high-voltage electrical equipment, such as... Figure 8 As shown, the battery charging method also includes the following steps:

[0100] S801. When the high-voltage battery fails to replenish the low-voltage battery via DC-DC converter, determine whether the SOC of the low-voltage battery is less than the third preset power threshold.

[0101] Among them, the third preset power threshold is the minimum SOC of the low-voltage battery to meet the requirements for the vehicle to be powered on.

[0102] S802. When it is determined that the SOC of the low-voltage battery is less than the third preset power threshold, an alarm message is sent to the terminal device through the BCM and battery detection unit.

[0103] The alarm message is used to notify the user that the SOC of the vehicle's low-voltage battery is less than the third preset power threshold (i.e., SOC2).

[0104] Optionally, the terminal device can be a handheld terminal.

[0105] Figure 9 This is a system logic diagram illustrating battery charging according to an exemplary embodiment, such as... Figure 9As shown, after the vehicle is powered down for x hours, the body control unit wakes up the network to determine the SOC of the 12V lead-acid battery and compares it with SOC1 to determine if the SOC of the 12V lead-acid battery is less than SOC1. If the SOC of the 12V lead-acid battery is determined to be not less than SOC1, the next step is not performed; if the SOC of the 12V lead-acid battery is determined to be less than SOC1, a charging signal is sent to the power control unit through the body control unit. The power control unit determines whether the high-voltage system is normal. If the high-voltage system is abnormal, the next step is not performed; if the high-voltage system is normal, the power control unit sends a charging signal to the DC-DC converter, and the DC-DC converter charges the 12V lead-acid battery. The power control unit then determines whether the charging of the 12V lead-acid battery is successful. If the charging is successful, the vehicle network enters sleep mode after the charging is completed; if the charging fails, it determines whether the SOC of the 12V lead-acid battery is less than SOC2. If the SOC of the 12V lead-acid battery is not less than SOC2, the next step is not performed; if the SOC of the 12V lead-acid battery is less than SOC2, an alarm message is sent to the battery detection unit through the BCM, and the alarm message is forwarded to the terminal device through the battery detection unit. After sending the alarm message, the vehicle network enters sleep mode.

[0106] The foregoing mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, the battery charging device or electronic device includes corresponding hardware structures and / or software modules for performing each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0107] This application embodiment can, based on the above method, exemplarily divide a battery charging device or electronic device into functional modules. For example, the battery charging device or electronic device may include functional modules corresponding to each functional division, or two or more functions may be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division; in actual implementation, there may be other division methods.

[0108] Figure 10 This is a block diagram illustrating a battery charging device according to an exemplary embodiment. (Refer to...) Figure 10The battery charging device 70 includes: an acquisition unit 701, a determination unit 702, and a processing unit 703;

[0109] The acquisition unit 701 is used to acquire the first ambient temperature T1 and the first voltage U1 of the low-voltage battery of the vehicle through the vehicle's battery detection unit after a first preset time has elapsed since the vehicle was powered off.

[0110] The determining unit 702 is used to determine the state of charge (SOC) of the low-voltage battery through the vehicle's body control unit (BCM) based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery. The supply voltage of the low-voltage battery is lower than a preset voltage value.

[0111] The processing unit 703 is used to replenish the low-voltage battery with power through the DC-DC converter when the SOC of the low-voltage battery is determined to be less than a first preset power threshold. The first preset power threshold is the SOC of the low-voltage battery in the state to be replenished.

[0112] In one possible implementation, the battery charging device 70 further includes a transmitting unit 704, which is used to send a charging signal to the vehicle's power control unit (PCU) via the BCM; the transmitting unit 704 is also used to send a charging signal to the vehicle's DC-DC converter via the PCU when the PCU determines that the vehicle's high-voltage system is normal.

[0113] In one possible implementation, the acquisition unit 701 is further configured to acquire the second ambient temperature T2 and the second voltage U2 of the low-voltage battery through the battery detection unit after a second preset time has elapsed since the vehicle is powered off, wherein the second preset time is less than the first preset time; the determination unit 702 is further configured to determine the static SOC of the low-voltage battery based on the second ambient temperature T2 and the second voltage U2 of the low-voltage battery through the TU-SOC relationship curve of the low-voltage battery, wherein the TU-SOC relationship curve is used to indicate the voltage and static SOC of the low-voltage battery at different ambient temperatures T.

[0114] In one possible implementation, the determining unit 702 is further configured to determine the load SOC of the low-voltage battery based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, using a T-SOC-U relationship correspondence table of the low-voltage battery. The T-SOC-U relationship correspondence table is used to indicate the voltage of the low-voltage battery under different ambient temperatures T and different load SOCs. The determining unit 702 is further configured to determine the SOC of the low-voltage battery using a BCM based on the static SOC and load SOC of the low-voltage battery.

[0115] In one possible implementation, the high-voltage system includes a high-voltage battery; a transmitting unit 704 is further configured to send a charging signal to the vehicle's high-voltage battery control unit (BMS) via a PCU; an acquiring unit 701 is further configured to acquire the SOC and discharge power of the vehicle's high-voltage battery via the BMS based on the charging signal, wherein the supply voltage of the high-voltage battery is greater than or equal to a preset voltage value; the transmitting unit 704 is further configured to send a charging signal to the vehicle's DC-DC converter via the PCU when the SOC of the high-voltage battery is greater than a second preset charge threshold and the discharge power of the high-voltage battery is greater than a preset discharge power, wherein the second preset charge threshold is the minimum SOC for the high-voltage battery to drive the vehicle, and the preset discharge power is the minimum discharge power for the high-voltage battery to drive the vehicle.

[0116] In one possible implementation, the determining unit 702 is further configured to determine whether the SOC of the low-voltage battery is less than a third preset power threshold when the high-voltage battery fails to replenish the low-voltage battery via DC-DC converter. The third preset power threshold is the minimum SOC of the low-voltage battery required for the vehicle to be powered on. The sending unit 704 is further configured to send an alarm message to the terminal device via BCM and battery detection unit when it is determined that the SOC of the low-voltage battery is less than the third preset power threshold. The alarm message is used to remind the user that the SOC of the low-voltage battery of the vehicle is less than the third preset power threshold.

[0117] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0118] Figure 11 This is a block diagram illustrating an electronic device according to an exemplary embodiment. Figure 11 As shown, the electronic device 80 includes, but is not limited to, a processor 801 and a memory 802.

[0119] The memory 802 described above is used to store the executable instructions of the processor 801. It is understood that the processor 801 is configured to execute instructions to implement the battery charging method in the above embodiment.

[0120] It should be noted that those skilled in the art will understand that Figure 11 The electronic device structure shown does not constitute a limitation on the electronic device; the electronic device may include, but is not limited to, other electronic devices. Figure 11 This may indicate more or fewer components, or a combination of certain components, or a different arrangement of components.

[0121] The processor 801 is the control center of the electronic device. It connects various parts of the electronic device via various interfaces and lines. By running or executing software programs and / or modules stored in the memory 802, and by calling data stored in the memory 802, it performs various functions and processes data, thereby providing overall monitoring of the electronic device. The processor 801 may include one or more processing units. Optionally, the processor 801 may integrate an application processor and a modem processor. The application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 801.

[0122] The memory 802 can be used to store software programs and various data. The memory 802 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, application programs required by at least one functional module (such as a determination unit, processing unit, etc.), etc. Furthermore, the memory 802 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0123] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 802 including instructions, which can be executed by a processor 801 of an electronic device 800 to implement the battery charging method in the above embodiments.

[0124] In actual implementation, Figure 10 The functions of the acquisition unit 701, determination unit 702, processing unit 703, and sending unit 704 can all be provided by... Figure 11 The processor 801 calls the computer program stored in the memory 802 to implement the process. The specific execution process can be found in the description of the battery charging method in the previous embodiment, and will not be repeated here.

[0125] Optionally, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a read-only memory (ROM), random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device.

[0126] In an exemplary embodiment, a vehicle including a battery charging device is also provided, which can perform the battery charging method in the above embodiments through the battery charging device.

[0127] In an exemplary embodiment, this application also provides a computer program product including one or more instructions, which can be executed by a processor 801 of an electronic device to complete the battery charging method in the above embodiments.

[0128] It should be noted that when one or more instructions in the computer-readable storage medium or computer program product are executed by the processor of the electronic device, they implement the various processes of the above-described battery charging method embodiments and achieve the same technical effect as the above-described battery charging method. To avoid repetition, they will not be described again here.

[0129] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0130] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another apparatus, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0131] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the classified units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0132] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0133] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, essentially, or the part that contributes to the prior art, or a complete or partial classification of the technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0134] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for replenishing a storage battery, characterized in that, include: After the vehicle is powered off, and a second preset time has elapsed, the battery detection unit obtains the second ambient temperature T2 and the second voltage U2 of the low-voltage battery. Based on the second ambient temperature T2 and the second voltage U2 of the low-voltage battery, the static SOC of the low-voltage battery is determined by the TU-SOC relationship curve of the low-voltage battery. The TU-SOC relationship curve is used to indicate the voltage and static SOC of the low-voltage battery at different ambient temperatures T. After the vehicle is powered off, a first preset time period is elapsed. The first ambient temperature T1 and the first voltage U1 of the low-voltage battery of the vehicle are obtained by the battery detection unit of the vehicle. The second preset time period is shorter than the first preset time period. Based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, the state of charge (SOC) of the low-voltage battery is determined by the vehicle's body control unit (BCM). The supply voltage of the low-voltage battery is lower than a preset voltage value. This includes: based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, determining the load SOC of the low-voltage battery through a T-SOC-U relationship table of the low-voltage battery. The T-SOC-U relationship table is used to indicate the voltage of the low-voltage battery under different ambient temperatures T and different load SOCs. The SOC of the low-voltage battery is determined by the BCM based on the static SOC and load SOC of the low-voltage battery. When the SOC of the low-voltage battery is determined to be less than a first preset power threshold, the high-voltage battery replenishes the low-voltage battery through a DC-DC converter. The first preset power threshold is the SOC of the low-voltage battery in the state to be replenished.

2. The method according to claim 1, characterized in that, Before the high-voltage battery replenishes the low-voltage battery via a DC-DC converter, the method further includes: The BCM sends a power replenishment signal to the vehicle's power control unit (PCU). If the PCU determines that the vehicle's high-voltage system is normal, the PCU sends the power replenishment signal to the vehicle's DC-DC converter.

3. The method according to claim 2, characterized in that, The high-voltage system includes the high-voltage storage battery; The step of sending the replenishment signal to the vehicle's DC-DC converter via the PCU when the PCU determines that the vehicle's high-voltage system is normal includes: The PCU sends the charging signal to the vehicle's high-voltage battery control unit (BMS). Based on the power replenishment signal, the SOC and discharge power of the vehicle's high-voltage battery are obtained through the BMS, and the supply voltage of the high-voltage battery is greater than or equal to the preset voltage value. When the SOC corresponding to the high-voltage battery is greater than the second preset power threshold and the discharge power corresponding to the high-voltage battery is greater than the preset discharge power, the PCU sends the charging signal to the vehicle's DC-DC converter. The second preset power threshold is the minimum SOC of the high-voltage battery driving the vehicle, and the preset discharge power is the minimum discharge power of the high-voltage battery driving the vehicle.

4. The method according to claim 1, characterized in that, The method further includes: When the high-voltage battery fails to replenish the low-voltage battery through the DC-DC converter, it is determined whether the SOC of the low-voltage battery is less than a third preset power threshold. The third preset power threshold is the minimum SOC of the low-voltage battery to meet the requirements for powering up the whole vehicle. When it is determined that the SOC of the low-voltage battery is less than the third preset power threshold, an alarm message is sent to the terminal device through the BCM and the battery detection unit. The alarm message is used to remind the user that the SOC of the low-voltage battery of the vehicle is less than the third preset power threshold.

5. A battery charging device, characterized in that, It includes an acquisition unit, a determination unit, and a processing unit; The acquisition unit is used to acquire the second ambient temperature T2 and the second voltage U2 of the low-voltage battery through the battery detection unit after a second preset time has elapsed since the vehicle is powered off. The determining unit is used to determine the static SOC of the low-voltage battery based on the second ambient temperature T2 and the second voltage U2 of the low-voltage battery, through the TU-SOC relationship curve of the low-voltage battery. The TU-SOC relationship curve is used to indicate the voltage and static SOC of the low-voltage battery at different ambient temperatures T. The acquisition unit is further configured to acquire the first ambient temperature T1 and the first voltage U1 of the low-voltage battery of the vehicle through the battery detection unit of the vehicle after a first preset time has elapsed since the vehicle is powered off, wherein the second preset time is less than the first preset time. The determining unit is further configured to determine the state of charge (SOC) of the low-voltage battery through the vehicle's body control unit (BCM) based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, wherein the supply voltage of the low-voltage battery is lower than a preset voltage value. The determining unit is specifically used to determine the load SOC of the low-voltage battery based on the first ambient temperature T1 and the first voltage U1 of the low-voltage battery, through the T-SOC-U relationship correspondence table of the low-voltage battery, wherein the T-SOC-U relationship correspondence table is used to indicate the voltage of the low-voltage battery under different ambient temperatures T and different load SOCs; and to determine the SOC of the low-voltage battery through the BCM based on the static SOC and load SOC of the low-voltage battery. The processing unit is configured to, when it is determined that the SOC of the low-voltage battery is less than a first preset power threshold, use a DC-DC converter (DCDC) to replenish the low-voltage battery, whereby the high-voltage battery replenishes the low-voltage battery. The first preset power threshold is the SOC of the low-voltage battery in the state to be replenished.

6. An electronic device, characterized in that, include: processor; Memory used to store the processor's executable instructions; The processor is configured to execute the instructions to implement the method as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, When the computer-executable instructions stored in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is capable of performing the method as described in any one of claims 1 to 4.

8. A vehicle, characterized in that, The vehicle includes the battery charging device as described in claim 5, and the vehicle is used to implement the method as described in any one of claims 1 to 4.

Images