CN106740120A - Low tension battery electric quantity controlling method and device - Google Patents

Abstract

The present invention proposes a low-voltage storage battery power control method and device. After obtaining the voltage value of the low-voltage storage battery, if the voltage value of the low-voltage storage battery is lower than the preset voltage threshold, the low-voltage alarm information is sent to the user terminal equipment, and the user terminal equipment is obtained according to the After the power-on permission information sent by the low-voltage alarm information, a control command is sent to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery; through the low-voltage battery power control method, the voltage value of the low-voltage battery can be lower than the preset voltage threshold. When charging the high-voltage power battery, the balance of the voltage of the low-voltage battery is maintained, and the normal start-up of low-voltage electrical equipment such as the vehicle electronic control unit is guaranteed.

Description

Low-voltage battery power control method and device

technical field

The invention relates to the field of electric quantity control of automobiles, in particular to a method and device for controlling electric quantity of a low-voltage storage battery.

Background technique

Vehicle low-voltage battery refers to the lead-acid battery that provides low-voltage power supply for low-voltage electrical equipment such as vehicle electronic control unit (Electronic Control Unit, referred to as ECU, also known as "driving computer", "vehicle computer"). When the low-voltage battery is not in use, the acidic electrolyte Sinking will cause a potential difference between the plate and the lower part, causing self-discharge. If the low-voltage battery discharges seriously, it will affect the power supply to the vehicle's low-voltage electrical equipment and affect the normal start of the vehicle, especially when the vehicle is left unused for a long time. Some of the electronic control units in the vehicle are still consuming the discharge current of the low-voltage battery, which leads to the existence of vehicle dark current. The low-voltage battery of the vehicle is likely to be over-discharged, which will affect the power-on of the low-voltage power supply equipment when the vehicle is ready to start, and cause the vehicle to fail. start up.

Contents of the invention

Based on this, the present invention proposes a low-voltage battery power control method and device, which can maintain the power balance of the low-voltage battery and ensure the normal start-up of low-voltage electrical equipment such as vehicle electronic control units.

A low-voltage storage battery power control method, comprising the following steps:

Obtain the voltage value of the low-voltage battery;

If the voltage value of the low-voltage storage battery is less than a preset voltage threshold, sending a low-voltage alarm message to the user terminal device;

After obtaining the power-on permission information sent by the user terminal device according to the low-voltage alarm information, it sends a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery.

A power control device for a low-voltage storage battery, comprising:

A voltage value acquisition module, configured to acquire the voltage value of the low-voltage storage battery;

The low-voltage alarm module is used to send low-voltage alarm information to the user terminal equipment if the voltage value of the low-voltage storage battery is less than the preset voltage threshold; the charging control module is used to obtain the power-on information sent by the user terminal equipment according to the low-voltage alarm information. After allowing the information, send a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery.

In the above-mentioned low-voltage battery power control method and device, after obtaining the voltage value of the low-voltage battery of the vehicle, if the voltage value of the low-voltage battery is lower than the preset voltage threshold, a low-voltage alarm message is sent to the user terminal device, indicating that the low-voltage battery is insufficient, and it will not be able to Provide a working power source for low-voltage electrical equipment such as the vehicle electronic control unit, and then the user terminal device sends power-on permission information according to the low-voltage alarm information, indicating that the user terminal device is allowed to charge the low-voltage power battery, and obtains the power-on information sent by the user terminal device. After allowing the information, send a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery. Through the low-voltage battery power control method, when the voltage value of the low-voltage battery is lower than the preset voltage threshold, the high-voltage power battery can be charged to maintain It ensures the balance of the low-voltage battery voltage and ensures the normal start-up of low-voltage electrical equipment such as vehicle electronic control units. Moreover, the control method can inform the user of the state of the low-voltage battery of the vehicle through the user terminal device in time, and the user terminal device is allowed to charge the low-voltage battery only after sending the power-on permission information according to the low-voltage alarm information, so as to prevent the user from leaving the vehicle for a long time. When the vehicle is running, the high-voltage power battery is always a low-voltage battery automatically, which affects the service life of the vehicle's low-voltage battery and high-voltage power battery.

Description of drawings

Fig. 1 is a flow chart of a low-voltage storage battery power control method in an embodiment;

Fig. 2 is a structural schematic diagram of a vehicle controller in an embodiment;

Fig. 3 is a flow chart of a low-voltage storage battery power control method in another embodiment;

Fig. 4 is a flow chart of a low-voltage storage battery power control method in yet another embodiment;

Fig. 5 is a flow chart of a low-voltage storage battery power control method in yet another embodiment;

Fig. 6 is a flow chart of a method for controlling the quantity of electricity of a low-voltage storage battery in yet another embodiment;

Fig. 7 is a flow chart of a low-voltage storage battery power control method in yet another embodiment;

Fig. 8 is a flow chart of a low-voltage storage battery power control method in yet another embodiment;

Fig. 9 is a schematic structural diagram of a low-voltage battery power control device in an embodiment;

Fig. 10 is a schematic structural diagram of a charging control module in an embodiment.

detailed description

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to Fig. 1, in one embodiment, a kind of low-voltage accumulator power control method, comprises the following steps:

S11: Obtain the voltage value of the low-voltage storage battery;

S12: If the voltage value of the low-voltage battery is less than a preset voltage threshold, send a low-voltage alarm message to the user terminal device;

S13: After obtaining the power-on permission information sent by the user terminal device according to the low-voltage alarm information, send a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery.

The low-voltage battery power control method of the present invention is applicable to new energy vehicles and other vehicles that use low-voltage batteries to supply power for normal startup of low-voltage electrical equipment such as vehicle electronic control units, such as electric vehicles or hybrid electric vehicles. The high-voltage power battery is a battery that provides a high-voltage power supply when driving the vehicle, and the voltage of the high-voltage power battery is higher than that of the low-voltage battery. Low-voltage battery refers to the battery that provides power for the low-voltage electrical equipment of the vehicle. For example, the low-voltage battery can supply power to the electronic control unit of the vehicle. Generally, the voltage of the low-voltage battery is a lead-acid battery, nickel-based battery or secondary lithium battery with a voltage of about 12V. The voltage of the high-voltage power battery is a lithium battery with a voltage of about 312V.

The user terminal equipment is a data terminal equipment with data processing and human-computer interaction functions, such as a smart phone. The low-voltage alarm information is the alarm information sent when the voltage value of the low-voltage battery is lower than the preset voltage threshold, and the low-voltage alarm can be sent to the user terminal equipment through wireless communication methods such as Bluetooth, WIFI, or mobile communication methods such as 2G/3G/4G/5G information. The power-on permission information is the information sent by the user terminal equipment after receiving the low-voltage alarm information. The purpose is to allow the high-voltage power battery to charge the low-voltage battery. Send the low-voltage alarm information to the user terminal equipment once or twice, if the power-on permission information is still not received, the low-voltage alarm information will not be sent again. The power-on permission information may be sent by the user manually triggering the user terminal device or automatically triggering by the user terminal device. For example, the user terminal device is a smart phone with a client terminal capable of obtaining the low-voltage alarm information and sending the power-on permission information. After the user terminal device receives the low-voltage alarm information, the user sends the power-on permission information through a touch screen.

The preset voltage threshold can be the lowest voltage critical value that can enable the normal start-up of low-voltage electrical equipment such as the vehicle electronic control unit through the low-voltage battery, and can be set according to user needs. A specific example is used below to illustrate, for example, the preset voltage threshold is 9V, and if the voltage value of the low-voltage battery is detected to be 8V, indicating that the low-voltage battery is insufficient, a low-voltage alarm message will be sent.

Please refer to Fig. 2, the power control method of the low-voltage battery can be realized by the following controllers and control methods: including a DC-to-DC controller, a battery controller (BMS) for obtaining the state of charge of the battery, and a high-voltage power battery (Fig. not shown), a low-voltage battery, a keyless entry system (PEPS) and a telematics box (TBOX) and a gateway device for communication and a user terminal device. The low-voltage battery is connected to the telematics box, and the DC-to-DC controller, low-voltage battery, battery controller, keyless entry system, and telematics box (TBOX) are connected to each other through a gateway device.

The telematics box is used to obtain the voltage value of the low-voltage storage battery, detect whether the voltage value of the low-voltage storage battery is less than a preset voltage threshold, and send a low-voltage alarm message to the user terminal equipment if it is lower than the preset voltage threshold. After the user terminal equipment obtains the low-voltage alarm information, it sends power-on permission information to the telematics processing box according to the low-voltage alarm information. After the telematics box obtains the power-on permission information, it sends a control command to the high-voltage power battery to control the high-voltage power The battery charges the low-voltage battery. Specifically, the telematics box controls the high-voltage power battery to convert the output high-voltage power into low-voltage power through the DC-to-DC controller to charge the low-voltage battery.

Please refer to Figure 3, before obtaining the voltage value of the low-voltage battery, the following steps are included:

S111: Obtain the running state of the vehicle;

S112: If the running state of the vehicle is a stopped state, detect the voltage value of the low-voltage battery.

The running state of the vehicle includes a driving state and a stopping state, which respectively indicate that the vehicle is currently in a driving mode and that the vehicle is in a mode not in use. Specifically, the running status of the vehicle can be obtained in the following ways:

Obtain the ignition key status of the vehicle;

If the state of the ignition key is the flame-off state, the voltage value of the low-voltage storage battery is detected.

The state of the ignition key includes an OFF state and an ON state, respectively indicating that the vehicle is in an ignition off state and an ignition state. After the remote information processing box judges that the ignition key of the vehicle is in the off state, the voltage value of the low-voltage battery can be detected. When the vehicle is in the off state, it means that the vehicle is not in use. During the rest period, it is very likely that excessive discharge will affect the low-voltage power supply equipment of the vehicle, such as the electronic control unit of the vehicle, causing the vehicle to fail to start normally. When the vehicle is turned off, charging the low-voltage battery that is lower than the preset voltage threshold can ensure that the vehicle is in Normal start-up of low-voltage electrical equipment such as electronic control units in the ignition state.

Please refer to Fig. 4, in an optional implementation manner, before sending the control command to the high-voltage power battery, the following steps are included:

S131: Obtain the state of charge of the high-voltage power battery;

S132: If the state of charge is greater than a preset critical value, send a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery.

State of Charge (SOC for short, also known as remaining power), represents the ratio of the remaining capacity of the battery after it has been used for a period of time or left unused for a long time to the capacity of the fully charged state, and its value ranges from 0 to 1 , when SOC=0, it means that the battery has been fully discharged, and the remaining capacity of the battery is 0, and when SOC=1, it means that the battery is fully charged. The preset critical value is the critical value at which the high-voltage power battery is the lowest state of charge capable of driving the vehicle. A specific example will be used to illustrate the following. For example, the preset critical value is 0.25, indicating that the state of charge of the high-voltage power battery is lower than 0.25, the power supply capacity of the high-voltage power battery is weakened, and it will be difficult to drive the vehicle. If the state of charge of the high-voltage power battery is 0.50, it means that the remaining power of the high-voltage power battery is 50%, which will not affect the driving of the vehicle. The information processing box and the battery controller obtain the state of charge of the power battery, and through the power balance control method of the low-voltage battery, the low-voltage battery can be charged when the power of the low-voltage battery is insufficient, so as to ensure the power balance of the low-voltage battery, so that the vehicle The low-voltage electrical equipment such as the electronic control unit can be started normally without affecting the driving of the vehicle driven by the high-voltage battery, which is reliable.

Please refer to FIG. 4. In an optional implementation manner, after obtaining the state of charge of the high-voltage power battery according to the power-on request information, if the state of charge is less than or equal to the preset critical value, the following Procedure Charge the low-voltage battery.

S133: If the state of charge is less than or equal to a preset critical value, send a control instruction to the engine, and control the engine to drive a generator to charge the low-voltage battery and the high-voltage power battery.

In addition to the high-voltage power battery and low-voltage battery, the device that provides energy for the vehicle also includes the engine. The engine is a power generation device that provides power for the vehicle. The combustion gas expands, pushes the piston to do work, and converts it into mechanical energy, and then converts the mechanical energy into electrical energy through the generator to charge the high-voltage power battery or low-voltage battery. If the state of charge of the high-voltage power battery is less than or equal to the preset critical value, indicating that the remaining power of the high-voltage power battery will not be able to drive the vehicle, a control command is sent to the engine to control the engine to drive the generator to charge the high-voltage power battery. Through the above low-voltage battery power control method, when the remaining power of the high-voltage power battery is insufficient and the voltage value of the low-voltage battery is lower than the preset voltage value, the generator can be driven by the engine to charge the high-voltage power battery and the low-voltage battery, so that the vehicle can be driven normally, ensuring The power balance of the low-voltage battery is ensured, so that the low-voltage electrical equipment such as the electronic control unit of the vehicle can start normally and has reliability.

In addition, for a gasoline-electric hybrid vehicle, if the state of charge is greater than a preset critical value, a control command can also be sent to the engine to control the engine to drive a generator to charge the low-voltage battery. The power of the high-voltage power battery is limited, and if the power is insufficient, it needs to be charged, and the service life will be affected if the number of charging and discharging is too many. Through the control method, the number of times of use of the high-voltage power battery can be reduced as much as possible to increase its service life.

Please refer to FIG. 5 , in one embodiment, before controlling the engine to drive the generator to charge the low-voltage storage battery and the high-voltage power battery, the following steps are included:

S1331: If the state of charge is less than or equal to a preset critical value, send charging request information to the user terminal device;

S1332: After obtaining the charging confirmation information sent by the user terminal device according to the charging request information, send a control command to the engine, and control the engine to drive a generator to charge the low-voltage battery and the high-voltage power battery.

If the obtained voltage value state of charge of the high-voltage power battery is less than or equal to the preset critical value, it means that both the high-voltage power battery and the low-voltage battery are insufficient, and a charging request message is sent to the user terminal device (such as a smart phone terminal) to ask the user Whether the engine is allowed to charge the low-voltage battery and the high-voltage power battery, if allowed, the user terminal device sends a charging confirmation message, agrees the engine to charge the low-voltage battery and the high-voltage power battery, and sends out a control command to control the engine to drive the generator to work as the low-voltage battery charging and charging of the high voltage traction battery. Through the control method, the state of the low-voltage battery and the high-voltage power battery of the vehicle can be notified to the user through the user terminal equipment in time, and the low-voltage battery and the high-voltage power battery can be charged after obtaining the charging confirmation information sent by the user, so as to prevent the user from leaving the vehicle for a long time At this time, the vehicle always automatically charges the low-voltage battery and high-voltage power battery, which affects the service life of the vehicle engine, generator, low-voltage battery and high-voltage power battery.

In an optional implementation manner, please refer to FIG. 6, after sending the low-voltage alarm information to the user terminal equipment, the following steps are included:

S121: Send inquiry information to the user terminal device according to the low-voltage alarm information;

S122: After obtaining the power-on permission information sent by the user terminal device according to the inquiry information, send a power-on request message to the keyless entry system, and send the control command to the high-voltage power battery.

The keyless entry system is a control system for remotely controlling the state of the vehicle key. When the keyless entry system controls the vehicle to be in the open state, each control unit of the vehicle is in a power-on state, and each control unit can communicate with each other. The present invention is not limited to using the keyless entry system to control the state of the key, and can also control the state of the vehicle key through a control system capable of controlling the state of the vehicle key, such as a body controller (BCM).

Please refer to Figure 2, if the voltage value of the low-voltage battery is less than the preset voltage threshold, the telematics box will send a low-voltage alarm message to the user terminal device, and at the same time send an inquiry message to the user terminal device according to the low-voltage alarm message, asking the user whether to It is allowed to charge the low-voltage battery. If the user terminal equipment allows it, it sends a power-on permission message, and the telematics box sends a power-on request message to the keyless entry system according to the power-on permission message, so that the keyless entry system keeps the key status In the open state, remotely control the power-on of each control unit of the vehicle; at the same time, the telematics box obtains the power-on permission information sent by the user terminal equipment, and sends a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery. Through the control method, the state of the low-voltage battery of the vehicle can be notified to the user through the user terminal device in time, the low-voltage battery can be charged after obtaining the user's permission, and the key state of the vehicle can be controlled to be on through the keyless entry system after the user's permission, It can remotely control the power-on of each control unit of the vehicle, and can communicate normally, which respects the wishes of the user, especially when the user intends to leave the vehicle for a long time without starting it.

Please refer to Fig. 7. In an optional implementation manner, after controlling the high-voltage power battery to charge the low-voltage battery, the following steps are included:

S15: Obtain the charging time of the low-voltage storage battery;

S16: If the charging time exceeds the calibrated time threshold, send a charging stop instruction to the high-voltage power battery, and control the high-voltage power battery to stop charging the low-voltage battery.

The calibration time threshold is the maximum time threshold allowed to charge the low-voltage battery, such as 30 minutes. After the low-voltage battery is charged, the telematics box starts the charging timing function of the DC current converter. The charging time of the battery for the low-voltage battery is 35 minutes. If it exceeds the calibrated time threshold, a command to stop charging will be sent to the high-voltage power battery to control the high-voltage power battery to stop charging the low-voltage battery. If during the charging timing period, the high-voltage power battery fails to charge the low-voltage battery, the vehicle control bus will be put to sleep for a period of time, such as 20 minutes, through the gateway device. After the dormancy, the high-voltage power battery will be re-controlled to charge the low-voltage battery. The information that the low-voltage storage battery is lower than the preset voltage threshold and the information of charging failure is sent to the user terminal equipment through the telematics box. The process of controlling the bus to sleep and power on again can be one time or more than two times, which can be set according to user needs. After charging the low-voltage battery to reach the calibrated time threshold, the low-voltage battery has enough power to supply low-voltage electrical equipment, while the high-voltage power battery is limited. The above control method can avoid excessive use of high-voltage power battery, which will affect the normal driving of the vehicle. If the charging of the low-voltage battery fails due to line failure and other reasons within the calibration time threshold, it can be recharged to ensure that the low-voltage battery has sufficient power and is flexible.

Please refer to Fig. 8. In an optional implementation manner, after controlling the high-voltage power battery to charge the low-voltage battery, the following steps are included:

S151: Obtain the charged voltage value of the low-voltage storage battery;

S161: If the voltage value is equal to the preset balance voltage threshold, send a charging stop instruction to the high-voltage power battery, and control the high-voltage power battery to stop charging the low-voltage battery.

The preset balance voltage threshold value is the voltage value that can enable the normal start-up of low-voltage electrical equipment such as the vehicle electronic control unit, such as 11V. If the storage battery can provide sufficient power for low-voltage electrical equipment such as the vehicle electronic control unit, it will send a stop charging command to the high-voltage power battery to control the high-voltage power battery to stop charging the low-voltage battery. After charging the low-voltage battery to reach the preset balance voltage threshold, the power of the low-voltage battery is sufficient to supply power for low-voltage electrical equipment. The above-mentioned control method can reduce the use of power of the high-voltage power battery and ensure the normal driving of the vehicle.

After the above-mentioned low-voltage battery power control method obtains the voltage value of the low-voltage battery of the vehicle, if the voltage value of the low-voltage battery is lower than the preset voltage threshold, a low-voltage alarm message is sent to the user terminal device, indicating that the low-voltage battery is insufficient and cannot provide power for the vehicle electronics. Low-voltage electrical equipment such as the control unit provides a working power source, and then the user terminal device sends power-on permission information according to the low-voltage alarm information, indicating that the user terminal device is allowed to charge the low-voltage power battery, and after obtaining the power-on permission information sent by the user terminal device , sending a control instruction to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery. Through the low-voltage battery power control method, when the voltage value of the low-voltage battery is lower than the preset voltage threshold, the high-voltage power battery is charged to maintain the low-voltage battery. The voltage balance ensures the normal start-up of low-voltage electrical equipment such as vehicle electronic control units. Moreover, the control method can inform the user of the state of the low-voltage battery of the vehicle through the user terminal device in time, and the user terminal device is allowed to charge the low-voltage battery only after sending the power-on permission information according to the low-voltage alarm information, so as to prevent the user from leaving the vehicle for a long time. When the vehicle is running, the high-voltage power battery is always a low-voltage battery automatically, which affects the service life of the vehicle's low-voltage battery and high-voltage power battery.

In one embodiment, please refer to FIG. 9 , a low-voltage storage battery power balance control device, including:

A voltage value acquisition module 10, configured to acquire the voltage value of the low-voltage storage battery;

A low-voltage alarm module 20, configured to send low-voltage alarm information to user terminal equipment if the voltage value of the low-voltage battery is less than a preset voltage threshold;

The charging control module 30 is configured to send a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage storage battery after obtaining the power-on permission information sent by the user terminal device according to the low-voltage alarm information.

In one embodiment, please refer to FIG. 10 , the charging control module 30 includes:

State of charge acquisition module 301, configured to acquire the state of charge of the high-voltage power battery;

The identification and control module 302 is configured to send a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery if the state of charge is greater than a preset critical value.

The low-voltage battery power balance control device of the present invention corresponds to the low-voltage battery power control method of the present invention one by one, and the technical features and beneficial effects described in the embodiments of the low-voltage battery power control method are applicable to the low-voltage battery power balance control device. Examples are hereby declared.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is the range described in this manual.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A low-voltage accumulator electric quantity control method, is characterized in that, comprises the following steps: Obtain the voltage value of the low-voltage battery; If the voltage value of the low-voltage storage battery is less than a preset voltage threshold, sending a low-voltage alarm message to the user terminal device; After obtaining the power-on permission information sent by the user terminal device according to the low-voltage alarm information, it sends a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery. 2. The low-voltage battery power control method according to claim 1, characterized in that, before sending the control command to the high-voltage power battery, the method comprises the following steps: Obtain the state of charge of the high-voltage power battery; If the state of charge is greater than a preset critical value, a control command is sent to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery. 3. The low-voltage battery power control method according to claim 2, comprising the following steps: If the state of charge is less than or equal to the preset critical value, a control command is sent to the engine to control the engine to drive the generator to charge the low-voltage battery and the high-voltage power battery. 4. The low-voltage storage battery power control method according to claim 3, wherein, before controlling the engine to drive a generator to charge the low-voltage storage battery and the high-voltage power battery, the steps include the following steps: If the state of charge is less than or equal to a preset critical value, sending charging request information to the user terminal device; After obtaining the charging confirmation information sent by the user terminal device according to the charging request information, it sends a control command to the engine to control the engine to drive the generator to charge the low-voltage battery and the high-voltage power battery. 5. The low-voltage battery power control method according to claim 1, characterized in that, after sending the low-voltage alarm information to the user terminal equipment, the method comprises the following steps: sending inquiry information to the user terminal equipment according to the low-voltage alarm information; After obtaining the power-on permission information sent by the user terminal device according to the inquiry information, send the power-on request information to the keyless entry system, and send the control command to the high-voltage power battery. 6. The low-voltage battery power control method according to claim 1, characterized in that, after controlling the high-voltage power battery to charge the low-voltage battery, the method comprises the following steps: Obtain the charging time of the low-voltage storage battery; If the charging time exceeds the calibrated time threshold, an instruction to stop charging is sent to the high-voltage power battery. 7. The low-voltage storage battery power control method according to claim 1, characterized in that, after controlling the high-voltage power battery to charge the low-voltage storage battery, the method comprises the following steps: Obtaining the charged voltage value of the low-voltage storage battery; If the charged voltage value is equal to the preset balanced voltage threshold, a charging stop command is sent to the high-voltage power battery. 8. The low-voltage storage battery power control method according to claim 1, wherein, before obtaining the voltage value of the low-voltage storage battery, the method comprises the following steps: Obtain the running status of the vehicle; If the running state of the vehicle is a stop state, then detect the voltage value of the low-voltage storage battery. 9. A low-voltage battery power balance control device, characterized in that it comprises: A voltage value acquisition module, configured to acquire the voltage value of the low-voltage storage battery; The low-voltage alarm module is used to send low-voltage alarm information to the user terminal equipment if the voltage value of the low-voltage storage battery is less than the preset voltage threshold; the charging control module is used to obtain the power-on information sent by the user terminal equipment according to the low-voltage alarm information. After allowing the information, send a control command to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery. 10. The low-voltage battery power balance control device according to claim 9, wherein the charging control module includes: The state of charge acquisition module is used to obtain the state of charge of the high-voltage power battery; The identification and control module is used to send a control instruction to the high-voltage power battery to control the high-voltage power battery to charge the low-voltage battery if the state of charge is greater than a preset critical value.