Charging system and method for low-voltage storage battery of vehicle

Abstract

The invention provides a charging system and method for a vehicle low-voltage storage battery, and belongs to the technical field of vehicle electronic control. The system comprises a storage battery sensor, a vehicle body controller, a vehicle control unit, a battery management system, a direct-current converter, a power battery and a low-voltage storage battery. A vehicle body controller in the system can monitor the residual electric quantity and voltage of a low-voltage storage battery through a storage battery sensor when a vehicle is in a power-off state, and then other controllers are awakened in time under the condition that it is judged that the low-voltage storage battery needs to be charged based on the residual electric quantity and voltage, so that a power battery is controlled to charge the low-voltage storage battery; therefore, the low-voltage storage battery can be automatically charged, the low-voltage storage battery is prevented from being lack of electricity when the vehicle is parked for a long time, and normal starting and driving of the vehicle are guaranteed.

Description

Technical Field

[0001] The present application relates to the field of vehicle electronic control technology, and in particular to a charging system and method for a vehicle low-voltage battery. Background Art

[0002] As a representative of new energy vehicles, electric vehicles have the advantages of economy, energy saving, and environmental protection. The batteries of electric vehicles include high-voltage power batteries and low-voltage batteries. When the vehicle is not in the starting state, the low-voltage battery provides power for the low-voltage electrical appliances of the vehicle. That is, when the vehicle is started, the low-voltage battery must have a suitable amount of power so that the vehicle start-related controllers can work normally. Due to the power loss of the low-voltage battery itself, after the vehicle has been parked for a long time, the power of the low-voltage battery may be too low, resulting in the inability to start the vehicle, which will cause a bad driving experience for the user. Therefore, how to avoid insufficient power of the low-voltage battery is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The embodiment of the present application provides a vehicle low-voltage battery charging system and method, which can enable the low-voltage battery to achieve automatic charging, avoid the low-voltage battery from running low when the vehicle is parked for a long time, and thus ensure the normal starting and driving of the vehicle. The technical solution is as follows:

[0004] On the one hand, a charging system for a low-voltage battery of a vehicle is provided, the system comprising: a battery sensor, a body controller, a vehicle controller, a battery management system, a DC converter, a power battery and a low-voltage battery;

[0005] The battery sensor and the body controller are connected via a LIN bus, the body controller, the vehicle controller, the battery management system and the DC converter are connected via a CAN bus, the battery management system and the power battery are connected via a hard line, the input end of the DC converter is connected to the power battery, and the output end of the DC converter is connected to the low-voltage battery;

[0006] The battery sensor is used to detect the remaining power and voltage of the low-voltage battery of the vehicle;

[0007] The battery management system is used to detect the remaining power of the power battery of the vehicle;

[0008] The body controller is used to wake up the battery sensor when the vehicle is in a power-off state to obtain the remaining power and voltage of the low-voltage battery; wake up the battery management system when the remaining power is less than a first preset power or the voltage is less than a preset voltage to obtain the remaining power of the power battery; wake up the vehicle controller when the remaining power of the power battery is greater than a second preset power, and send a supplementary power on request to the vehicle controller;

[0009] The vehicle controller is used to respond to the supplementary power on request, send a high voltage power-on request to the battery management system, and send an enable signal to the DC converter;

[0010] The battery management system is further used to control the main positive relay and the main negative relay of the power battery to close in response to the high-voltage power-on request, so as to provide the voltage output by the power battery to the DC converter;

[0011] The DC converter is used to convert the voltage of the power battery into a charging voltage of the low-voltage battery in response to the enable signal, so as to charge the low-voltage battery.

[0012] In some embodiments, the vehicle controller is used to respond to the supplementary power on request, send a high voltage power-on request to the battery management system, and send an enable signal to the DC converter, including:

[0013] The vehicle controller is used to respond to the power replenishment start request and obtain the status of the vehicle; when the status of the vehicle meets the high-voltage power-on condition, the high-voltage power-on request is sent to the battery management system and the enable signal is sent to the DC converter.

[0014] In some embodiments, the body controller is also used to send a sleep signal to the battery sensor, the vehicle controller, the battery management system and the DC converter after a first preset time period, in response to the remaining power of the low-voltage battery being not less than the first preset power or the voltage being not less than the preset voltage, and enter a sleep state when the battery sensor, the vehicle controller, the battery management system and the DC converter all enter a sleep state.

[0015] In some embodiments, the body controller is also used to send a power replenishment failure signal to the battery sensor, the vehicle controller, the battery management system and the DC converter when high-voltage power-on fails, so that the battery sensor, the vehicle controller, the battery management system and the DC converter enter a sleep state based on the power replenishment failure signal; and enter a sleep state when the battery sensor, the vehicle controller, the battery management system and the DC converter all enter a sleep state.

[0016] In some embodiments, the vehicle body controller is further configured to enter a dormant state when the remaining power is not less than the first preset power or the voltage is not less than the preset voltage;

[0017] The body controller is also used to send a sleep signal to the battery sensor and the battery management system when the remaining power of the power battery is not greater than the second preset power, and enter a sleep state when the battery sensor and the battery management system enter a sleep state.

[0018] In some embodiments, the body controller is also used to start timing when entering the sleep state, and enter the start state at a preset time interval after timing to achieve self-wake-up; in response to entering the start state, re-execute the step of waking up the battery sensor.

[0019] In some embodiments, the vehicle body controller is also used to no longer enter the startup state when the number of consecutive charging failures of the low-voltage battery reaches a preset number.

[0020] In some embodiments, the system further includes: a vehicle-mounted terminal, the vehicle-mounted terminal being connected to the vehicle body controller via a CAN bus;

[0021] The vehicle body controller is also used to send a prompt message to the vehicle terminal when the number of consecutive charging failures of the low-voltage battery reaches a preset number, and the prompt message is used to prompt that the charging function of the low-voltage battery of the vehicle is abnormal;

[0022] The vehicle-mounted terminal is used to display the prompt information, or forward the prompt information to a terminal used by the driver of the vehicle.

[0023] In some embodiments, the battery sensor is further used to detect the temperature of the low-voltage battery;

[0024] The vehicle body controller is also used to obtain the temperature of the low-voltage battery when the vehicle is in a power-off state, and wake up the electronic constant temperature control system of the vehicle when the temperature is lower than a preset temperature value; and send a heating request to the electronic constant temperature control system;

[0025] The electronic constant temperature control system is used to heat the low-voltage battery based on the voltage output by the power battery in response to the heating request.

[0026] On the other hand, a method for replenishing a low-voltage battery of a vehicle is provided, which is applied to a replenishing system for a low-voltage battery of a vehicle, wherein the system comprises: a battery sensor, a body controller, a vehicle controller, a battery management system, a DC converter, a power battery and a low-voltage battery, wherein the battery sensor and the body controller are connected via a LIN bus, the body controller, the vehicle controller, the battery management system and the DC converter are connected via a CAN bus, the battery management system and the power battery are connected via a hard line, the input end of the DC converter is connected to the power battery, and the output end of the DC converter is connected to the low-voltage battery; the method comprises:

[0027] When the vehicle is in a power-off state, the body controller wakes up the battery sensor to obtain the remaining power and voltage of the low-voltage battery, and the battery sensor is used to detect the remaining power and voltage of the low-voltage battery;

[0028] When the remaining power is less than a first preset power or the voltage is less than a preset voltage, the vehicle body controller wakes up the battery management system to obtain the remaining power of the power battery, and the battery management system is used to detect the remaining power of the power battery of the vehicle;

[0029] When the remaining power of the power battery is greater than the second preset power, the body controller wakes up the vehicle controller and sends a supplementary power on request to the vehicle controller;

[0030] In response to the supplementary power on request, the vehicle controller sends a high voltage power on request to the battery management system and sends an enable signal to the DC converter;

[0031] The battery management system controls the main positive relay and the main negative relay of the power battery to close in response to the high-voltage power-on request, so as to provide the voltage output by the power battery to the DC converter;

[0032] In response to the enable signal, the DC converter converts the voltage of the power battery into a charging voltage of the low-voltage battery to charge the low-voltage battery.

[0033] An embodiment of the present application provides a charging system for a vehicle's low-voltage battery. The body controller can monitor the remaining power and voltage of the low-voltage battery through a battery sensor when the vehicle is in a power-off state, and then, when it is determined based on the remaining power and voltage that the low-voltage battery needs to be charged, the body controller promptly wakes up other controllers to control the power battery to charge the low-voltage battery, so that the low-voltage battery can be automatically charged, avoiding low-voltage battery power when the vehicle is parked for a long time, thereby ensuring normal starting and driving of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a structural schematic diagram of a vehicle low-voltage battery charging system provided according to an embodiment of the present application;

[0036] Figure 2 It is a structural schematic diagram of another vehicle low-voltage battery charging system provided according to an embodiment of the present application;

[0037] Figure 3 It is a flow chart of a method for charging a low-voltage battery of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0039] In this application, the terms "first", "second", etc. are used to distinguish identical or similar items with substantially the same effects and functions. It should be understood that there is no logical or temporal dependency between "first", "second", and "nth", nor are there any limitations on quantity and execution order.

[0040] In the present application, the term "at least one" means one or more, and the term "plurality" means two or more.

[0041] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0042] Figure 1 Schematic diagram of a vehicle low-voltage battery charging system according to an embodiment of the present application. Figure 1 The system includes: a battery sensor 101, a body controller 102, a vehicle controller 103, a battery management system 104, a DC converter 105, a power battery 106 and a low-voltage battery 107;

[0043] The battery sensor 101 and the body controller 102 are connected via a LIN (Local Interconnect Network) bus, the body controller 102, the vehicle controller 103, the battery management system 104 and the DC converter 105 are connected via a CAN (Controller Area Network) bus, the battery management system 104 and the power battery 106 are connected via a hard wire, the input end of the DC converter 105 is connected to the power battery 106, and the output end of the DC converter 105 is connected to the low-voltage battery 107.

[0044] The battery sensor 101 is used to detect the remaining power and voltage of the low-voltage battery 107 of the vehicle. The battery sensor 101 is installed on the low-voltage battery 107 to detect the remaining power and voltage of the battery 107.

[0045] The battery management system 104 is used to detect the remaining power of the vehicle's power battery 106. The battery management system 104 includes a battery monitor and a battery manager. The battery monitor is used to monitor the state of the power battery, including parameters such as temperature, power, and voltage, and transmit these parameters to the battery manager. The battery manager is used to control the charging and discharging process of the power battery according to the state of the power battery.

[0046] The body controller 102 is used to wake up the battery sensor 101 when the vehicle is in a power-off state to obtain the remaining power and voltage of the low-voltage battery 107; when the remaining power is less than a first preset power or the voltage is less than a preset voltage, wake up the battery management system 104 to obtain the remaining power of the power battery 106; when the remaining power of the power battery 106 is greater than a second preset power, wake up the vehicle controller 103 and send a recharging start request to the vehicle controller 103.

[0047] The power-off state of the vehicle may also be referred to as the flameout state of the vehicle. In the power-off state, the main positive relay and the main negative relay of the power battery 106 of the vehicle are disconnected to cut off the high-voltage circuit connection between the power battery 106 and the electronic control unit of the vehicle, that is, the power battery 106 stops supplying power to the vehicle, and the low-voltage battery supplies power to the vehicle, so that the vehicle can wake up the electronic control unit of the vehicle based on the power provided by the low-voltage battery after power failure, thereby completing the start-up of the vehicle.

[0048] In order to prevent the low-voltage battery from running out of power during long-term parking of the vehicle, the vehicle's body controller 102 can obtain the remaining power and voltage of the low-voltage battery 107, and determine whether the low-voltage battery 107 needs to be recharged based on the remaining power and voltage. Accordingly, the body controller 102 can enter the startup state after the vehicle is powered off to achieve self-wake-up. In order to obtain the current remaining power and voltage of the low-voltage battery 107, after entering the startup state, the body controller 102 will send a wake-up signal to the battery sensor 101 through the LIN bus to wake up the battery sensor 101. After startup, the battery sensor 101 will send the detected remaining power and voltage of the low-voltage battery 107 to the body controller 102 through the LIN bus. When the remaining power of the low-voltage battery 107 is less than the first preset power or the voltage is less than the preset voltage, it indicates that the current remaining power or voltage of the low-voltage battery 107 is low, so the vehicle body controller 102 can determine that the low-voltage battery 107 needs to be recharged, that is, the power battery 106 of the vehicle needs to be controlled to charge the low-voltage battery 107. The first preset power can be 20% or 30%, and the preset voltage can be 12 volts or 13 volts.

[0049] In order to ensure that the power battery 106 has sufficient power, that is, the power of the power battery 106 is sufficient to charge the low-voltage battery 107, the body controller 102 can send a wake-up signal to the battery management system 104 through the CAN bus to wake up the battery management system 104. After starting, the battery management system 104 will send the detected remaining power of the power battery 106 to the body controller 102. When the remaining power of the power battery 106 is greater than the second preset power, it indicates that the remaining power of the power battery 106 is sufficient to charge the low-voltage battery 107. Therefore, the body controller 102 can send a wake-up signal to the vehicle control 103, so that the vehicle control 103 can perform the corresponding power replenishment operation based on the power replenishment start request after waking up. The second preset power can be 10%, 15%, 20%, etc.

[0050] In some embodiments, the body controller 102 is also used to send a sleep signal to the battery sensor 101 when the remaining power is not less than a first preset power or the voltage is not less than a preset voltage, and enter a sleep state when the battery sensor 101 enters the sleep state; or, the body controller 102 is also used to send a sleep signal to the battery sensor 101 and the battery management system 104 when the remaining power of the power battery 106 is not greater than a second preset power, and enter a sleep state when the battery sensor 101 and the battery management system 104 enter the sleep state.

[0051] Among them, the dormant state refers to the low-voltage electrical appliances such as the battery sensor 101, the body controller 102, the vehicle controller 103, the battery management system 104, and the DC converter 105 of the vehicle being in a low-power operation state. That is, in the dormant state, the low-voltage electrical appliances only keep the necessary functions turned on, and the non-essential functions are turned off. For example, for the vehicle controller, its necessary functions may be to receive signals, analyze the received signals, and when the received signals are specific signals (such as wake-up signals), it can be out of the low-power operation state and in the start-up state. Accordingly, when the remaining power of the low-voltage battery 107 is not less than the first preset power or the voltage is not less than the preset voltage, it indicates that the current remaining power or voltage of the low-voltage battery 107 is at a normal value, so the body controller 102 can determine that the low-voltage battery 107 does not need to be recharged at present. In order to reduce the power consumption of the low-voltage battery 107 that supplies power to the vehicle in the power-off state, the body controller can send a dormant signal to the battery sensor 101 that has been started to control it to enter the dormant state, and can also control itself to enter the dormant state. Similarly, when the remaining power of the low-voltage battery 107 is less than the first preset power or the voltage is less than the preset voltage, if the remaining power of the power battery 106 is not greater than the second preset power, it indicates that the remaining power of the power battery 106 is insufficient to charge the low-voltage battery 107, that is, the low-voltage battery 107 fails to charge. In order to reduce the power consumption of the low-voltage battery 107, the body controller 102 can send a sleep signal to the already activated battery sensor 101 and the battery management system 104 to control them to enter a sleep state, and finally enter the sleep state itself.

[0052] The vehicle controller 103 is used to respond to the supplementary power on request, send a high-voltage power-on request to the battery management system 104, and send an enable signal to the DC converter 105. Among them, the power battery 106 can charge the low-voltage battery 107 when the vehicle is in a high-voltage power supply state. Among them, the action of closing the positive relay and the negative relay of the power battery pack 300 can also be called high-voltage power-on. In the high-voltage power supply state, the power battery 106 can provide high voltage for the operation of the high-voltage electrical appliances of the vehicle. Accordingly, the vehicle controller 103 can send a high-voltage power-on request to the battery management system 104 to instruct the battery management system 104 to complete the high-voltage power-on. In order for the DC converter 105 to charge the low-voltage battery 107 based on the voltage provided by the power battery 106 after completing the high-voltage power-on, the vehicle control 103 can also send an enable signal to the DC converter 105 to wake up the DC converter 105.

[0053] In some embodiments, the vehicle controller 103 is used to respond to the supplementary power on request and obtain the status of the vehicle; when the status of the vehicle meets the high-voltage power-on condition, a high-voltage power-on request is sent to the battery management system 104, and an enable signal is sent to the DC converter 105. Among them, the high-voltage power-on condition refers to the conditions that need to be met when the vehicle achieves high-voltage power-on, including that the DC converter 105 of the vehicle is not faulty and the power battery 106 is faulty. The battery management system 104 can detect the working status of the power battery 106 and feed back the detection results to the vehicle controller 103. The DC converter 105 can detect the working status by itself and feed back the detection results to the vehicle controller 103.

[0054] The battery management system 104 is further configured to control the main positive relay and the main negative relay of the power battery 106 to close in response to a high voltage power-on request, so as to provide the voltage output by the power battery 106 to the DC converter 105 .

[0055] Among them, the high-voltage power-on request is used to request the vehicle to enter a high-voltage power supply state. The high-voltage power supply state can also be called a high-voltage power-on completion state, which specifically refers to the state that the vehicle enters when the positive relay and the negative relay of the power battery 106 are closed. Accordingly, in response to the high-voltage power-on request, the battery management system 104 can control the main positive relay and the main negative relay of the power battery 106 to close through a hard-wired connection with the power battery 106 to achieve high-voltage power-on of the vehicle.

[0056] The DC converter 105 is used to convert the voltage of the power battery 106 into a charging voltage of the low-voltage battery 107 in response to the enable signal, so as to charge the low-voltage battery 107 .

[0057] When the main positive relay and the main negative relay of the power battery 106 are closed, the power battery 106 can provide high voltage electricity to the DC converter 105. Accordingly, after starting, the DC converter 105 can convert the voltage output by the power battery 106 into the charging voltage of the low-voltage battery 107, that is, convert it from a high voltage to a low voltage, so as to charge the low-voltage battery 107 based on the low voltage.

[0058] In some embodiments, Figure 2 is a structural schematic diagram of another vehicle low-voltage battery charging system provided according to an embodiment of the present application. Figure 2 , the system also includes an electronic constant temperature control system 108. The electronic constant temperature control system 108 is connected to the body controller 102 through a CAN bus, the electronic constant temperature control system 108 is connected to the power battery 106 through a high-voltage line, and the electronic constant temperature control system 108 is connected to the low-voltage battery 107 through a hard line. The battery sensor 101 is also used to detect the temperature of the low-voltage battery 107. The body controller 102 is also used to obtain the temperature of the low-voltage battery 107 when the vehicle is in a power-off state, and wake up the electronic constant temperature control system 108 of the vehicle when the temperature is lower than a preset temperature value; send a heating request to the electronic constant temperature control system 108; the electronic constant temperature control system 108 is used to respond to the heating request and heat the low-voltage battery 107 based on the voltage output by the power battery 106. Among them, after being awakened, the battery sensor 101 can also send the current temperature of the low-voltage battery 107 to the body controller 102. Since the low-voltage battery 107 may not be charged due to low temperature, the vehicle body controller 102 can send a wake-up signal to the vehicle's electronic thermostat system 108 to wake up the electronic thermostat system 108 when it detects that the temperature of the low-voltage battery 107 is lower than a preset temperature value. The electronic thermostat system 108 is used to convert the electrical energy of the power battery into thermal energy to heat the low-voltage battery 107. That is, the electronic thermostat system 108 can provide the voltage output by the power battery to the electric heating element in the electronic thermostat system 108, and provide the heat generated by the electric heating element to the low-voltage battery to heat the low-voltage battery 107.

[0059] In some embodiments, the body controller 102 is also used to send a sleep signal to the battery sensor 101, the vehicle controller 103, the battery management system 104 and the DC converter 105 in response to the remaining power of the low-voltage battery 107 being not less than the first preset power or the voltage being not less than the preset voltage after the first preset time, and enter the sleep state when the battery sensor 101, the vehicle controller 103, the battery management system 104 and the DC converter 105 all enter the sleep state. When charging the low-voltage battery 107, the body controller 102 can also monitor the power and voltage of the low-voltage battery 107 in real time through the battery sensor 101. If after the first preset time, the body controller 102 detects that the remaining power of the low-voltage battery 107 is not less than the first preset power or the voltage is not less than the preset voltage, the body controller 102 can determine that the low-voltage battery 107 is successfully charged. The first preset time is the charging time of the low-voltage battery 107. If the voltage of the low-voltage battery 107 before charging is less than 10 volts, the first preset time may be 60 minutes; if the voltage of the low-voltage battery 107 before charging is greater than 10 and less than 12 volts, the first preset time may be 40 minutes; if the voltage of the low-voltage battery 107 before charging is greater than 12 and less than 13 volts, the first preset time may be 20 minutes. Accordingly, when it is determined that the low-voltage battery 107 is successfully charged, it indicates that the low-voltage battery 107 does not need to be recharged at present, so the body controller 102 can send a sleep signal to the battery sensor 101, the vehicle controller 103, the battery management system 104 and the DC converter 105 to control them to re-enter the sleep state, and after they enter the sleep state, they also control themselves to enter the sleep state, thereby reducing the power consumption of the low-voltage battery 107 that supplies power to the vehicle in the power-off state.

[0060] In some embodiments, the body controller 102 is also used to send a power supply failure signal to the battery sensor 101, the vehicle controller 103, the battery management system 104 and the DC converter 105 in the case of a high-voltage power-on failure, so that the battery sensor 101, the vehicle controller 103, the battery management system 104 and the DC converter 105 enter a dormant state based on the power supply failure signal; enter a dormant state when the battery sensor 101, the vehicle controller 103, the battery management system 104 and the DC converter 105 all enter a dormant state. Among them, the high-voltage power-on failure means that the DC converter 105 cannot obtain the high voltage electricity required for work, that is, the low-voltage battery 107 fails to charge at this time. In order to reduce the power consumption of the low-voltage battery 107 that supplies power to the vehicle in a power-off state, the body controller 102 can send a power supply failure signal to the battery sensor 101, the vehicle controller 103, the battery management system 104 and the DC converter 105. After receiving the power supply failure signal, each controller can re-enter the dormant state. After each controller enters the sleep state, the vehicle body controller 102 can also control itself to enter the sleep state.

[0061] In some embodiments, the body controller 102 is also used to start timing when entering the dormant state, and enter the startup state every preset time after timing to achieve self-wake-up; in response to entering the startup state, the step of waking up the battery sensor 101 is re-executed. Among them, a timing component is provided in the body controller 102, and the timing component can realize the timing function. After the body controller 102 enters the dormant state each time, the timing component can start timing, and during the timing process, every preset time, it sends a startup instruction to the input and output module in the body controller 102, so that the body controller 102 enters the startup state to achieve self-wake-up. After waking up, the body controller 102 can monitor again whether the current low-voltage battery 107 needs to be recharged, and perform the corresponding recharge operation when recharge is needed. The preset time length can be 1 hour or 2 hours, and the embodiment of the present application is not limited to this. By allowing the body controller 102 to wake itself up once at regular intervals, the body controller 102 can continuously monitor the power and voltage of the low-voltage battery 107 when the vehicle is parked for a long time. While saving the power consumption of the low-voltage battery 107, it effectively avoids the situation where the vehicle cannot be started due to low power of the low-voltage battery 107 after being parked for a long time.

[0062] In some embodiments, the body controller 102 is also used to no longer enter the startup state when the number of consecutive charging failures of the low-voltage battery 107 reaches a preset number. Among them, since the body controller 102 can control the entire vehicle to enter a dormant state after the low-voltage battery 107 fails to charge, and self-wake up again to perform a charging operation when the preset time is reached during the dormant process, the number of consecutive charging failures refers to the number of times the low-voltage battery 107 fails to charge after the body controller 102 self-wakes up multiple times in a row. If the number of consecutive charging failures reaches the preset number of failures, it indicates that the vehicle may have a fault that makes it impossible to charge the low-voltage battery 107, so the vehicle controller 102 will not enter the startup state after the next preset time.

[0063] In some embodiments, see Figure 2 The system also includes: an on-board terminal 109, which is connected to the body controller 102 via a CAN bus. The body controller 102 is also used to send a prompt message to the on-board terminal 109 when the number of consecutive charging failures of the low-voltage battery 107 reaches a preset number of times, and the prompt message is used to prompt that the charging function of the low-voltage battery 107 of the vehicle is abnormal; the on-board terminal 109 is used to display the prompt message, or forward the prompt message to the terminal used by the driver of the vehicle. Among them, since the vehicle is likely to fail and the low-voltage battery 107 cannot be charged when the number of consecutive charging failures reaches the preset number of failures, the vehicle is likely to fail, so before entering the sleep state, the body controller 102 can also send a prompt message to the on-board terminal 109 to prompt the driver of the vehicle that the charging function of the low-voltage battery 107 of the vehicle is abnormal. In order to avoid the situation where the driver of the vehicle is not in the vehicle, the on-board terminal 109 can also forward the prompt information to the terminal used by the driver, that is, the user's mobile terminal, so as to promptly notify the user that the low-voltage battery cannot be recharged, so that the user can take relevant measures in time to solve the problem of failure to recharge the low-voltage battery 107.

[0064] An embodiment of the present application provides a charging system for a vehicle's low-voltage battery. The body controller can monitor the remaining power and voltage of the low-voltage battery through a battery sensor when the vehicle is in a power-off state, and then, when it is determined based on the remaining power and voltage that the low-voltage battery needs to be charged, the body controller promptly wakes up other controllers to control the power battery to charge the low-voltage battery, so that the low-voltage battery can be automatically charged, avoiding low-voltage battery power when the vehicle is parked for a long time, thereby ensuring normal starting and driving of the vehicle.

[0065] Figure 3This is a flow chart of a method for charging a low-voltage battery in a vehicle provided according to an embodiment of the present application. The method is executed by a charging system for a low-voltage battery in a vehicle configured in a vehicle. The system includes: a battery sensor, a body controller, a vehicle controller, a battery management system, a DC converter, a power battery, and a low-voltage battery. The battery sensor and the body controller are connected via a LIN bus. The body controller, the vehicle controller, the battery management system, and the DC converter are connected via a CAN bus. The battery management system and the power battery are connected via a hard line. The input end of the DC converter is connected to the power battery, and the output end of the DC converter is connected to the low-voltage battery. Figure 3 As shown, the method for replenishing the low-voltage battery of the vehicle includes the following steps:

[0066] 301. When the vehicle is in a power-off state, the body controller sends a wake-up signal to the battery sensor to wake up the battery sensor. The battery sensor is used to detect the remaining power and voltage of the low-voltage battery and send the remaining power and voltage of the low-voltage battery to the body controller.

[0067] 302. When the remaining power is less than the first preset power or the voltage is less than the preset voltage, the body controller sends a wake-up message to the battery management system to wake up the battery management system. The battery management system is used to detect the remaining power of the vehicle's power battery and send the remaining power of the power battery to the body controller.

[0068] 303. When the remaining power of the power battery is greater than the second preset power, the body controller wakes up the vehicle controller and sends a power replenishment start request to the vehicle controller.

[0069] 304. In response to the charging start request, the vehicle controller sends a high-voltage power-on request to the battery management system and sends an enable signal to the DC converter.

[0070] 305. In response to the high-voltage power-on request, the battery management system controls the main positive relay and the main negative relay of the power battery to close, so as to provide the voltage output by the power battery to the DC converter.

[0071] 306. In response to the enable signal, the DC converter converts the voltage of the power battery into a charging voltage of the low-voltage battery to charge the low-voltage battery.

[0072] An embodiment of the present application provides a method for recharging a low-voltage battery of a vehicle. The body controller can monitor the remaining power and voltage of the low-voltage battery through a battery sensor when the vehicle is in a power-off state, and then, when it is determined based on the remaining power and voltage that the low-voltage battery needs to be recharged, the body controller promptly wakes up other controllers to control the power battery to recharge the low-voltage battery, so that the low-voltage battery can be automatically recharged, avoiding low-voltage battery power when the vehicle is parked for a long time, thereby ensuring normal starting and driving of the vehicle.

[0073] It should be noted that the vehicle low-voltage battery charging method provided in the embodiment of the present application and the embodiment of the vehicle low-voltage battery charging system mentioned above belong to the same concept. The specific process is detailed in the embodiment of the vehicle low-voltage battery charging system, which will not be repeated here.

[0074] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A charging system for a low-voltage battery of a vehicle, characterized in that: The system includes: a battery sensor, a body controller, a vehicle controller, a battery management system, a DC converter, a power battery and a low-voltage battery; The battery sensor and the body controller are connected via a LIN bus, the body controller, the vehicle controller, the battery management system and the DC converter are connected via a CAN bus, the battery management system and the power battery are connected via a hard line, the input end of the DC converter is connected to the power battery, and the output end of the DC converter is connected to the low-voltage battery; The battery sensor is used to detect the remaining power and voltage of the low-voltage battery; The battery management system is used to detect the remaining power of the power battery; The body controller is used to wake up the battery sensor when the vehicle is in a power-off state to obtain the remaining power and voltage of the low-voltage battery; wake up the battery management system when the remaining power is less than a first preset power or the voltage is less than a preset voltage to obtain the remaining power of the power battery; wake up the vehicle controller when the remaining power of the power battery is greater than a second preset power, and send a supplementary power on request to the vehicle controller; The vehicle controller is used to respond to the supplementary power on request, send a high voltage power-on request to the battery management system, and send an enable signal to the DC converter; The battery management system is further used to control the main positive relay and the main negative relay of the power battery to close in response to the high-voltage power-on request, so as to provide the voltage output by the power battery to the DC converter; The DC converter is used to convert the voltage of the power battery into a charging voltage of the low-voltage battery in response to the enable signal, so as to charge the low-voltage battery.

2. The system according to claim 1, characterized in that The vehicle controller is used to respond to the supplementary power on request, send a high voltage power-on request to the battery management system, and send an enable signal to the DC converter, including: The vehicle controller is used to respond to the power replenishment start request and obtain the status of the vehicle; when the status of the vehicle meets the high-voltage power-on condition, the high-voltage power-on request is sent to the battery management system and the enable signal is sent to the DC converter.

3. The system according to claim 1, characterized in that The body controller is also used to send a sleep signal to the battery sensor, the vehicle controller, the battery management system and the DC converter after a first preset time period, in response to the remaining power of the low-voltage battery being not less than the first preset power or the voltage being not less than the preset voltage, and enter a sleep state when the battery sensor, the vehicle controller, the battery management system and the DC converter all enter a sleep state.

4. The system according to claim 1, characterized in that The body controller is also used to send a power replenishment failure signal to the battery sensor, the vehicle controller, the battery management system and the DC converter when the high-voltage power-on fails, so that the battery sensor, the vehicle controller, the battery management system and the DC converter enter a sleep state based on the power replenishment failure signal; and enter a sleep state when the battery sensor, the vehicle controller, the battery management system and the DC converter all enter a sleep state.

5. The system according to claim 1, characterized in that The vehicle body controller is further configured to send a sleep signal to the battery sensor when the remaining power is not less than the first preset power or the voltage is not less than the preset voltage, and enter a sleep state when the battery sensor enters a sleep state; The body controller is also used to send a sleep signal to the battery sensor and the battery management system when the remaining power of the power battery is not greater than the second preset power, and enter a sleep state when the battery sensor and the battery management system enter a sleep state.

6. The system according to any one of claims 3 to 5, characterized in that: The vehicle body controller is also used to start timing when entering the sleep state, and enter the start state every preset time after timing to achieve self-wake-up; in response to entering the start state, re-execute the step of waking up the battery sensor.

7. The system according to claim 6, characterized in that The vehicle body controller is also used for not entering the startup state again when the number of consecutive charging failures of the low-voltage battery reaches a preset number.

8. The system according to claim 6, characterized in that The system further comprises: a vehicle-mounted terminal, wherein the vehicle-mounted terminal is connected to the vehicle body controller via a CAN bus; The vehicle body controller is also used to send a prompt message to the vehicle terminal when the number of consecutive charging failures of the low-voltage battery reaches a preset number, and the prompt message is used to prompt that the charging function of the low-voltage battery of the vehicle is abnormal; The vehicle-mounted terminal is used to display the prompt information, or forward the prompt information to a terminal used by the driver of the vehicle.

9. The system according to claim 1, characterized in that The battery sensor is also used to detect the temperature of the low-voltage battery; The vehicle body controller is also used to obtain the temperature of the low-voltage battery when the vehicle is in a power-off state, and wake up the electronic constant temperature control system of the vehicle when the temperature is lower than a preset temperature value; and send a heating request to the electronic constant temperature control system; The electronic constant temperature control system is used to heat the low-voltage battery based on the voltage output by the power battery in response to the heating request.

10. A method for replenishing power of a low-voltage battery of a vehicle, characterized in that: A charging system for a low-voltage battery of a vehicle, the system comprising: a battery sensor, a body controller, a vehicle controller, a battery management system, a DC converter, a power battery and a low-voltage battery, the battery sensor and the body controller are connected via a LIN bus, the body controller, the vehicle controller, the battery management system and the DC converter are connected via a CAN bus, the battery management system and the power battery are connected via a hard line, the input end of the DC converter is connected to the power battery, and the output end of the DC converter is connected to the low-voltage battery; the method comprises: When the vehicle is in a power-off state, the body controller wakes up the battery sensor to obtain the remaining power and voltage of the low-voltage battery, and the battery sensor is used to detect the remaining power and voltage of the low-voltage battery; When the remaining power is less than a first preset power or the voltage is less than a preset voltage, the vehicle body controller wakes up the battery management system to obtain the remaining power of the power battery, and the battery management system is used to detect the remaining power of the power battery of the vehicle; When the remaining power of the power battery is greater than the second preset power, the body controller wakes up the vehicle controller and sends a supplementary power on request to the vehicle controller; In response to the supplementary power on request, the vehicle controller sends a high voltage power on request to the battery management system and sends an enable signal to the DC converter; The battery management system controls the main positive relay and the main negative relay of the power battery to close in response to the high-voltage power-on request, so as to provide the voltage output by the power battery to the DC converter; In response to the enable signal, the DC converter converts the voltage of the power battery into a charging voltage of the low-voltage battery to charge the low-voltage battery.

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