CN114954126A

CN114954126A - Power supplementing method and power supplementing control device for starting battery of electric vehicle

Info

Publication number: CN114954126A
Application number: CN202210693207.6A
Authority: CN
Inventors: 阎全忠; 李洁辰
Original assignee: Shanghai Rox Intelligent Technology Co Ltd
Current assignee: Shanghai Rox Intelligent Technology Co Ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2022-08-30

Abstract

The application provides a power supplementing method and a power supplementing control device for a starting battery of an electric vehicle, wherein the power supplementing method comprises the following steps: when the current voltage of a starting battery of the target electric vehicle is smaller than a voltage threshold, starting a DCDC converter, sending the electric quantity of a power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and acquiring the electric quantity of the power supplement received by the starting battery in real time in the power supplement process; determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value; if so, stopping the power battery to supplement power for the starting battery; if not, continuing to supplement the electricity for the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value. By adopting the technical scheme provided by the application, the power supply electric quantity threshold value can be determined, so that the switch of the DCDC converter is controlled, the power supply control of the starting battery is realized, and the power supply performance of the electric vehicle is improved.

Description

Power supplementing method and power supplementing control device for starting battery of electric vehicle

Technical Field

The present disclosure relates to the field of automotive technologies, and in particular, to a method and a device for compensating a starting battery of an electric vehicle.

Background

Along with the deep development of automobile electromotion, intellectualization and networking, the quantity of automobile electric devices and controllers is more and more, the energy management requirement on the starting battery of the electric automobile is more and more important, when the starting battery is under-voltage, the whole automobile controller can be awakened in time, and then the high-voltage battery pack and the converter are used for supplementing electricity to the starting battery in time.

At present, a power supplementing strategy is mainly used for supplementing power to a starting battery by taking preset power supplementing duration or preset starting battery target power supplementing quantity as a power supplementing target, but when vehicle components are aged, the power supplementing strategy causes frequent power supplementing of the starting battery, and the power supply performance of an electric vehicle is influenced; therefore, how to supplement the power to the starting battery and improve the power supply performance of the electric vehicle becomes a problem to be solved urgently.

Disclosure of Invention

In view of this, an object of the present application is to provide a method and an apparatus for supplementing power to a starting battery of an electric vehicle, which can send the power of a power battery to the starting battery through a DCDC converter by turning on the DCDC converter to supplement power to the starting battery, and obtain the power supplementing electric quantity received by the starting battery in real time during the power supplementing process, control the power battery to supplement power to the starting battery, stop the power supplementing until the power supplementing electric quantity of the starting battery reaches a power supplementing electric quantity threshold, and control a switch of the DCDC converter by determining the power supplementing electric quantity threshold, thereby implementing the power supplementing control to the starting battery, and improving the power supply performance of the electric vehicle.

The application mainly comprises the following aspects:

in a first aspect, the present embodiment provides a method for supplementing a starting battery of an electric vehicle, which is applied to a system for supplementing a starting battery of an electric vehicle, where the system includes a compensation control device, a power battery, a battery management system BMS, a DCDC converter, and a starting battery; the BMS comprises a power battery management system and a starting battery management system; the power supplementing method comprises the following steps:

receiving a wake-up signal, and determining whether a current voltage of a starting battery of a target electric vehicle is less than a voltage threshold in response to the wake-up signal; the starting battery is used for starting a target electric vehicle to supply power to the target electric vehicle;

if the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, starting a DCDC converter, sending the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and acquiring the electric quantity of the power supplement received by the starting battery in real time in the power supplement process; the power battery is used for supplying power to the starting battery;

determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value;

if the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value, closing the DCDC converter, and disconnecting the electric connection between the power battery and the DCDC converter so as to stop the power battery from supplementing electricity to the starting battery;

and if the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value, continuing to supplement electricity for the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Further, the electricity supplementing electric quantity threshold value is determined through the following steps:

acquiring the expected duration of the target electric vehicle in the sleep period after being powered off, the consumption current of the starting battery in the sleep period and the rated voltage of the starting battery from the starting battery management system;

determining the product of the expected duration, the consumed current and the rated voltage as the expected power consumption of the starting battery in the sleep period;

acquiring the health state of the starting battery from the starting battery management system, and determining the health state compensation coefficient of the starting battery according to the health state of the starting battery;

acquiring the current temperature of the starting battery from the starting battery management system, and determining the temperature compensation coefficient of the starting battery according to the current temperature;

and determining the product of the expected power loss, the state of health compensation coefficient and the temperature compensation coefficient as a power compensation power threshold value of the starting battery.

Further, a DCDC converter is started, and the electric quantity of the power battery is sent to the starting battery through the DCDC converter so as to supplement the power for the starting battery, wherein the DCDC converter comprises the following steps:

determining whether a remaining capacity of a power battery of the target electric vehicle is greater than a charging capacity threshold;

if so, determining whether the electrical connection between the power battery and the DCDC converter is connected; if not, generating a control command and sending the control command to the power battery management system to complete high-voltage operation so as to establish electrical connection between the power battery and the DCDC converter; if so, starting a DCDC converter, and sending the electric quantity of the power battery to the starting battery through the DCDC converter so as to supplement the electric quantity of the starting battery;

if not, determining whether the target electric vehicle is a hybrid vehicle type; if the hybrid electric vehicle is of a hybrid electric vehicle type, after the electric connection between the power battery and the DCDC converter is determined to be switched on, the range extender of the target electric vehicle is controlled to charge the power battery with preset power generation power, the DCDC converter is started at the same time, the electric quantity of the power battery is sent to the starting battery through the DCDC converter to supplement the power for the starting battery, and whether the residual electric quantity of the power battery of the target electric vehicle is larger than the preset charging electric quantity or not is continuously determined.

Further, the preset generated power is determined by the following steps:

acquiring input voltage and input current of the DCDC converter, and determining the product of the input voltage and the input current as the actual consumed power of the DCDC converter;

and obtaining the allowable charging power of the power battery, and determining the preset generating power of the range extender according to the allowable charging power and the actual consumed power of the DCDC converter.

Further, the power supply method further comprises:

and if the target electric vehicle is not of a hybrid vehicle type, generating alarm information to prompt a user to charge.

In a second aspect, the present application further provides a power supply control device, which is applied to a power supply system of a starting battery of an electric vehicle, where the power supply system includes the power supply control device, a power battery, a battery management system BMS, a DCDC converter, and the starting battery; the BMS comprises a power battery management system and a starting battery management system; the compensation control device comprises:

a response module for receiving a wake-up signal, determining whether a current voltage of a starting battery of a target electric vehicle is less than a voltage threshold in response to the wake-up signal; the starting battery is used for starting a target electric vehicle to supply power to the target electric vehicle;

the power supplementing module is used for starting a DCDC converter when the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, sending the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the power for the starting battery, and acquiring the power supplementing electric quantity received by the starting battery in real time in the power supplementing process; the power battery is used for supplying power to the starting battery;

the judging module is used for determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value;

the processing module is used for closing the DCDC converter and disconnecting the electric connection between the power battery and the DCDC converter to stop the power battery from supplementing power to the starting battery when the power supplementing electric quantity reaches a power supplementing electric quantity threshold value;

and the control module is used for continuing to supplement the electricity for the starting battery when the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Further, the compensation control device further includes a first determining module, where the first determining module is configured to:

Further, when the power supplement module is configured to start a DCDC converter and send the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, the power supplement module is specifically configured to:

In a third aspect, an embodiment of the present application further provides an electronic device, including: the battery charging method comprises a processor, a memory and a bus, wherein the memory stores machine readable instructions executable by the processor, the processor and the memory are communicated through the bus when the electronic device runs, and the machine readable instructions are executed by the processor to execute the steps of the battery charging method for starting the electric vehicle.

In a fourth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to perform the steps of the method for starting up a battery of an electric vehicle as described above.

The power supplementing method and the power supplementing control device for the starting battery of the electric vehicle are applied to a power supplementing system for the starting battery of the electric vehicle, and the power supplementing system comprises a power supplementing control device, a power battery, a battery management system BMS, a DCDC converter and the starting battery; the BMS comprises a power battery management system and a starting battery management system; the power supplementing method comprises the following steps: receiving a wake-up signal, and determining whether a current voltage of a starting battery of a target electric vehicle is less than a voltage threshold in response to the wake-up signal; the starting battery is used for starting a target electric vehicle to supply power to the target electric vehicle; if the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, starting a DCDC converter, sending the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and acquiring the electric quantity of the power supplement received by the starting battery in real time in the power supplement process; the power battery is used for supplying power to the starting battery; determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value; if the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value, closing the DCDC converter, and disconnecting the electric connection between the power battery and the DCDC converter so as to stop the power battery from supplementing electricity to the starting battery; and if the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value, continuing to supplement electricity for the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Like this, adopt the technical scheme that this application provided can be through opening the DCDC converter, send the electric quantity of power battery for the start-up battery through the DCDC converter and in order to mend the electricity to the start-up battery, and obtain the received benefit electric quantity of start-up battery in real time at benefit electricity in-process, control power battery mends the electricity to the start-up battery, when the benefit electric quantity of start-up battery reaches benefit electric quantity threshold value, stop mending the electricity, through confirming the benefit electric quantity threshold value, thereby control the switch of DCDC converter, realize the benefit control to the start-up battery, the power supply performance of electric vehicle has been improved.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 shows a flowchart of a method for replenishing a starting battery of an electric vehicle according to an embodiment of the present application;

FIG. 2 is a flow chart illustrating another method for replenishing the starting battery of the electric vehicle according to the embodiment of the present application;

FIG. 3 is a schematic diagram illustrating a power supplementing process provided by an embodiment of the present application;

fig. 4 is a diagram illustrating one of the structures of a compensation control device according to an embodiment of the present application;

fig. 5 shows a second structure diagram of a compensation control device provided in the embodiment of the present application;

fig. 6 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application.

Detailed Description

To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for illustrative and descriptive purposes only and are not used to limit the scope of protection of the present application. Additionally, it should be understood that the schematic drawings are not necessarily drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be performed out of order, and that steps without logical context may be performed in reverse order or concurrently. One skilled in the art, under the guidance of this application, may add one or more other operations to, or remove one or more operations from, the flowchart.

In addition, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

To enable those skilled in the art to utilize the present disclosure, the following embodiments are presented in conjunction with a specific application scenario "power replenishment of a starting battery of an electric vehicle", and it will be apparent to those skilled in the art that the general principles defined herein may be applied to other embodiments and application scenarios without departing from the spirit and scope of the present disclosure.

The method, the apparatus, the electronic device, or the computer-readable storage medium described in the embodiments of the present application may be applied to any scenario that requires power compensation for a starting battery of an electric vehicle, and the embodiments of the present application do not limit specific application scenarios.

It is worth noting that with the deep development of automobile electromotion, intellectualization and networking, the number of automobile electric devices and controllers is more and more, the energy management requirement on the starting battery of the electric automobile is more and more important, when the starting battery is under-voltage, the whole automobile controller can be awakened in time, and then the starting battery is timely supplemented with electricity by using the high-voltage battery pack and the converter.

Based on the above, the present application provides a method and a device for recharging a starting battery of an electric vehicle, which are applied to a recharging system of a starting battery of an electric vehicle, wherein the recharging system comprises a recharging control device, a power battery, a battery management system BMS, a DCDC converter and a starting battery; the BMS comprises a power battery management system and a starting battery management system; the power supplementing method comprises the following steps: receiving a wake-up signal, and determining whether a current voltage of a starting battery of a target electric vehicle is less than a voltage threshold in response to the wake-up signal; the starting battery is used for starting a target electric vehicle to supply power to the target electric vehicle; if the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, starting a DCDC converter, sending the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and acquiring the electric quantity of the power supplement received by the starting battery in real time in the power supplement process; the power battery is used for supplying power to the starting battery; determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value; if the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value, closing the DCDC converter, and disconnecting the electric connection between the power battery and the DCDC converter so as to stop the power battery from supplementing electricity to the starting battery; and if the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value, continuing to supplement electricity for the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Like this, adopt the technical scheme that this application provided can be through opening the DCDC converter, send power battery's electric quantity for the starting battery through the DCDC converter and in order to carry out the benefit electricity to the starting battery, and obtain the benefit electricity electric quantity that the starting battery received in real time at benefit electricity in-process, control power battery carries out the benefit electricity to the starting battery, when the benefit electricity electric quantity that reaches the benefit electricity electric quantity threshold value of starting battery, stop the benefit electricity, through confirming the benefit electricity electric quantity threshold value, thereby control the switch of DCDC converter, realize the benefit control to the starting battery, the power supply performance of electric vehicle has been improved.

For the purpose of facilitating an understanding of the present application, the technical solutions provided in the present application will be described in detail below with reference to specific embodiments.

Referring to fig. 1, fig. 1 is a flowchart illustrating a method for supplementing power to a starting battery of an electric vehicle according to an embodiment of the present disclosure, as shown in fig. 1, the method includes:

s101, receiving a wake-up signal, and determining whether the current voltage of a starting battery of a target electric vehicle is smaller than a voltage threshold value or not in response to the wake-up signal;

in the step, the power supply method is applied to a power supply system of a starting battery of an electric vehicle, and the power supply system comprises a power supply Control device, namely a Vehicle Control Unit (VCU), a power battery, a Battery Management System (BMS), a Direct Current (DCDC) converter, the starting battery, a range extender system, a network connection controller (Tbox), a cloud service platform and a user terminal; the BMS comprises a power battery management system and a starting battery management system; the starting battery is used for starting the target electric vehicle to supply power to the target electric vehicle; the power battery is used for supplementing power to the starting battery; a DCDC converter is a device that converts a dc power supply of a certain voltage class into a dc power supply of another voltage class; the range extender system comprises an engine and engine Management system EMS (Engine Management System) and an integrated starting and generating machine ISG (Integrated Starter and Generator); the range extender system is unique to a hybrid vehicle type, and the range extender system is not contained in a pure electric vehicle type.

Here, in step S101, a power supply control device, i.e., VCU, for executing the power supply method; the VCU receives the wake-up signal, is awakened from the dormant state at regular time through the wake-up signal, responds to the wake-up signal, acquires the current voltage of the starting battery from the starting battery management system, determines whether the current voltage is smaller than a voltage threshold value or not, and if the current voltage of the starting battery of the target electric vehicle is not smaller than the voltage threshold value, the VCU sleeps until the wake-up signal is received; the voltage threshold is determined by the under-voltage fault voltage of the VCU plus a preset margin, e.g., the preset margin is set to 0.5V, and the voltage threshold is equal to +0.5V of the under-voltage fault voltage of the VCU.

S102, if the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, starting a DCDC converter, sending the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and acquiring the electric quantity of the power supplement received by the starting battery in real time in the power supplement process;

in the step, when the current voltage of the starting battery of the target electric vehicle is determined to be smaller than the voltage threshold, the VCU wakes up other nodes including the power battery, the power battery management system, the starting battery management system, the DCDC converter, the starting battery, the range extender system, the Tbox and the like through the bus; after the nodes are awakened, the DCDC converter needs to be started, the electric quantity of the power battery is sent to the starting battery through the DCDC converter so as to supplement the power for the starting battery, and the power supplementing electric quantity received by the starting battery is obtained in real time in the power supplementing process.

It should be noted that, a DCDC converter is turned on, and the electric quantity of the power battery is sent to the starting battery through the DCDC converter to replenish the starting battery:

s1021, determining whether the residual capacity of the power battery of the target electric vehicle is larger than a charging capacity threshold value;

in the step, the VCU acquires the remaining capacity of the power battery of the target electric vehicle from the power battery management system, and determines whether the remaining capacity of the current power battery is greater than a charging capacity threshold, where the charging capacity threshold is a lowest alarm threshold of the state of charge SOC of the power battery in the experimental data.

S1022, if yes, determining whether the electrical connection between the power battery and the DCDC converter is connected; if not, generating a control command and sending the control command to the power battery management system to complete high-voltage operation so as to establish electrical connection between the power battery and the DCDC converter; if yes, starting a DCDC converter, and sending the electric quantity of the power battery to the starting battery through the DCDC converter so as to supplement the power for the starting battery;

in the step, when the residual electric quantity of the current power battery is larger than a charging electric quantity threshold value, the residual electric quantity of the power battery is sufficient, and the power battery does not need to be charged, so that whether a target electric vehicle is a hybrid vehicle type is determined, when the target electric vehicle is a hybrid vehicle type, a VCU determines whether a range extender of the target electric vehicle stops generating power or not by acquiring information fed back by a range extender system, if the target electric vehicle is not the hybrid vehicle type, the VCU sends a control command for stopping generating power to the range extender system to control the range extender to stop generating power, and after the range extender stops generating power, whether a power battery management system is high-voltage or not is determined, namely whether the electric connection between the power battery and a DCDC converter is connected or not is determined, and if the power battery management system is not connected, the control command for generating the high-voltage is sent to the power battery management system to complete the high-voltage operation so as to establish the electric connection between the power battery and the DCDC converter; if the power supply is connected, the VCU starts the DCDC converter, the electric quantity of the power battery is sent to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and whether the residual electric quantity of the power battery of the target electric vehicle is larger than the charging electric quantity threshold value or not is continuously determined.

S1023, if not, determining whether the target electric vehicle is a hybrid vehicle type; if the hybrid vehicle type is the hybrid vehicle type, after the fact that the power battery is electrically connected with the DCDC converter is confirmed, the range extender of the target electric vehicle is controlled to charge the power battery with preset power generation power, the DCDC converter is started at the same time, the electric quantity of the power battery is sent to the starting battery through the DCDC converter to supplement the power for the starting battery, and whether the residual electric quantity of the power battery of the target electric vehicle is larger than the preset charging electric quantity or not is continuously confirmed.

In the step, when the residual capacity of the current power battery is less than or equal to a charging capacity threshold value, the residual capacity of the power battery is insufficient, and the power battery needs to be charged, because only a hybrid vehicle type is provided with a range extender, whether a target electric vehicle is a hybrid vehicle type is determined, if the target electric vehicle is the hybrid vehicle type, whether a power battery management system is high-voltage or not is determined, namely whether the electric connection between the power battery and a DCDC converter is connected or not is determined, and if the target electric vehicle is not the hybrid vehicle type, a control instruction of the high-voltage is generated and sent to the power battery management system to complete the high-voltage operation so as to establish the electric connection between the power battery and the DCDC converter; if the VCU is connected, the VCU controls the range extender of the target electric vehicle to generate electricity to the power battery with preset power generation power so as to charge the power battery, the VCU starts the DCDC converter while the range extender charges the power battery, the electric quantity of the power battery is sent to the starting battery through the DCDC converter so as to supplement the electricity to the starting battery, and whether the residual electric quantity of the power battery of the target electric vehicle is larger than the charging electric quantity threshold value is continuously determined.

Here, when determining whether the target electric vehicle is a hybrid vehicle type, if the target electric vehicle is not the hybrid vehicle type, the VCU generates an alarm message to alarm through the Tbox to prompt the user that the electric quantity is insufficient and the charging is required, and after the alarm, the VCU stops the bus communication and enters the sleep mode.

It should be noted that the preset generated power is determined by the following steps:

1) acquiring input voltage and input current of the DCDC converter, and determining the product of the input voltage and the input current as the actual consumed power of the DCDC converter;

in this step, the VCU obtains the input voltage and the input current of the DCDC converter, and calculates the actual power consumption (actual power consumption) at the input side of the DCDC converter according to the following formula:

P _DCDC ＝U _DCDC ×I _DCDC ；

wherein, P _DCDC Is the actual consumed power of the DCDC converter; u shape _DCDC Is the input voltage of the DCDC converter; i is _DCDC Is the input current of the DCDC converter.

2) And obtaining the allowable charging power of the power battery, and determining the preset generating power of the range extender according to the allowable charging power and the actual consumed power of the DCDC converter.

In this step, the VCU acquires the charging power allowed by the power battery in real time from the power battery management system through the bus, and a formula for calculating the preset power generation power of the range extender is as follows:

P＝P _DCDC +P _BMS -P _offset ；

wherein P is the preset power generation power of the range extender; p _DCDC Is the actual consumed power of the DCDC converter; p _BMS Allowable charging power for the power battery; p _offset To calibrate the offset.

S103, determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value;

in this step, the power compensation capacity threshold is determined according to the expected power consumption of the starting battery and the temperature of the starting battery. Step of determining a power compensation capacity threshold referring to fig. 2, fig. 2 is a flowchart of another power compensation method for starting a battery of an electric vehicle according to an embodiment of the present application, as shown in fig. 2, the power compensation capacity threshold is determined by the following steps:

s201, acquiring expected duration of the target electric vehicle in a sleep period after power-off, consumption current of the starting battery in the sleep period and rated voltage of the starting battery from the starting battery management system;

s202, determining the product of the expected duration, the consumed current and the rated voltage as the expected power consumption of the starting battery in the sleep period;

in the step, after the whole vehicle of the target electric vehicle is powered off, dark current consumed by a starting battery when all nodes are in dormancy is obtained through test data, and expected power consumption of the starting battery in the dormancy period is calculated through the following formula:

Q _{decrease in the thickness of the steel} ＝U _{Forehead (forehead)} ×I×h；

Wherein Q is _{Decrease in the thickness of the steel} Expected power drain to start the battery; u shape _{Forehead (forehead)} Rated voltage for starting the battery; h is the required parking time of the automobile, namely the expected duration of the sleep period; i is dark current, namely the consumption current of the starting battery in the sleep period;

s203, acquiring the health state of the starting battery from the starting battery management system, and determining the health state compensation coefficient of the starting battery according to the health state of the starting battery;

in this step, the VCU obtains the state of health SOH of the starting battery from the starting battery management system, and determines a state of health compensation coefficient, i.e. an SOH compensation coefficient, of the starting battery according to the state of health SOH, for example, the SOH compensation coefficient may be determined by the following formula:

wherein, SOH is the state of health of the starting battery.

S204, acquiring the current temperature of the starting battery from the starting battery management system, and determining the temperature compensation coefficient of the starting battery according to the current temperature;

in the step, the VCU acquires the current temperature of the starting battery from the starting battery management system, and determines the temperature compensation coefficient of the starting battery according to the current temperature; for example, the temperature compensation coefficient may be determined by the following formula:

wherein the content of the first and second substances,

is a temperature compensation coefficient; t is the current temperature of the starting battery.

S205, determining the product of the expected power consumption, the health state compensation coefficient and the temperature compensation coefficient as a power compensation power threshold value of the starting battery.

In this step, the formula for starting the electricity supplementing electric quantity threshold of the battery is as follows:

wherein Q is a power supplement electric quantity threshold of the starting battery, and there is no limitation on the sequence of acquiring the current temperature of the starting battery, the health state of the starting battery, the expected duration of the target electric vehicle in the sleep period after powering off, the consumed current of the starting battery in the sleep period, and the rated voltage of the starting battery, and the sequence may be acquired by multiple threads simultaneously or in any sequence.

S104, if the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value, closing the DCDC converter, and disconnecting the electric connection between the power battery and the DCDC converter to stop the power battery from supplementing electricity to the starting battery;

in the step, when the power supplementing electric quantity reaches a power supplementing electric quantity threshold value, the VCU controls the DCDC converter to be closed, generates a low-voltage control instruction and sends the low-voltage control instruction to the power battery management system to complete low-voltage operation so as to disconnect the electric connection between the power battery and the DCDC converter, so that the power battery stops supplementing power for the starting battery; if the hybrid electric vehicle is of a hybrid electric vehicle type, after the power battery and the DCDC converter are disconnected, the VCU needs to acquire information fed back by the range extender system to determine whether the range extender of the target electric vehicle stops generating power, if the VCU does not stop generating power, the VCU sends a control instruction for stopping generating power to the range extender system to control the range extender to stop generating power, and after the vcU determines that the range extender stops generating power, the VCU stops bus communication and enters a sleep mode.

And S105, if the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value, continuing to supplement electricity for the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

For example, referring to fig. 3, fig. 3 is a schematic diagram of a power supplement process provided in the embodiment of the present application, and as shown in fig. 3, step one, VCU wakes up at a fixed time. And step two, judging whether the voltage of the starting battery is smaller than a voltage threshold value after the VCU is awakened, if the condition is met, awakening a range extender system (a hybrid vehicle type), a battery management system BMS (a starting battery management system and a power battery management system), a DCDC converter, a starting battery and a network connection controller Tbox by the VCU through a communication bus. And step three, if the condition is not satisfied, namely the VCU judges that the voltage of the starting battery is not less than the voltage threshold, the VCU enters the dormancy. And step four, when the SOC of the power battery management system is larger than the charging electric quantity threshold value, the VCU controls the range extender system to stop generating power, if the power battery management system is not high-voltage, the VCU controls the power battery management system to finish high-voltage application, and the DCDC converter is started to supplement power for the starting battery. Step five, when the SOC of the power battery management system is larger than the threshold value of the charging electric quantity, the VCU judges whether the electric vehicle is a hybrid vehicle type, and if the electric vehicle is not the hybrid vehicle type, the step eight is carried out; if the hybrid electric vehicle is a hybrid electric vehicle, the VCU judges whether the power battery management system is in high voltage, if not, the VCU controls the power battery management system to finish high voltage application, and when the power battery management system finishes high voltage application, the VCU controls the range extender system to generate electricity with preset power generation power, and then the VCU starts the DCDC converter to supplement the electricity. Step six, in the power supplementing process, the VCU judges whether the SOC of the power battery management system is larger than a charging electric quantity threshold value or not, and if the SOC of the power battery management system is larger than the charging electric quantity threshold value, the step four is carried out; and if the charging capacity is not greater than the charging capacity threshold value, entering a fifth step. Step seven, in the power supplementing process, the VCU judges whether the power supplementing electric quantity reaches a power supplementing electric quantity threshold value, if so, the VCU stops the DCDC converter, controls the power battery management system to finish high voltage, controls the range extender system to stop generating power and finally enters the dormancy; if not, continuing to supplement power. And step eight, when the SOC of the power battery management system is not greater than the charging electric quantity threshold value and the vehicle type is not a hybrid vehicle type, the VCU sends information that the power battery is insufficient in electric quantity and cannot supplement the power for the starting battery to the Tbox through the communication bus, and the Tbox sends the information to the user terminal through the cloud service platform to prompt the user to charge. Finally, the VCU stops bus communication and goes to sleep.

The power supply system comprises a power supply control device, a power battery, a battery management system BMS, a DCDC converter and a starting battery; the BMS comprises a power battery management system and a starting battery management system; the power supplementing method comprises the following steps: receiving a wake-up signal, and determining whether a current voltage of a starting battery of a target electric vehicle is less than a voltage threshold in response to the wake-up signal; the starting battery is used for starting a target electric vehicle to supply power to the target electric vehicle; if the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, starting a DCDC converter, sending the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and acquiring the electric quantity of the power supplement received by the starting battery in real time in the power supplement process; the power battery is used for supplementing power to the starting battery; determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value; if the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value, closing the DCDC converter, and disconnecting the electric connection between the power battery and the DCDC converter so as to stop the power battery from supplementing electricity to the starting battery; and if the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value, continuing to supplement electricity for the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Based on the same application concept, the embodiment of the present application further provides a power supplement control device corresponding to the method for supplementing power to the starting battery of the electric vehicle provided by the above embodiment, and as the principle of solving the problem of the device in the embodiment of the present application is similar to the method for supplementing power to the starting battery of the electric vehicle provided by the above embodiment of the present application, the implementation of the device may refer to the implementation of the method, and repeated parts are not repeated.

Referring to fig. 4 and 5, fig. 4 is a first structural diagram of a compensation control device provided in an embodiment of the present application, and fig. 5 is a second structural diagram of a compensation control device provided in an embodiment of the present application. As shown in fig. 4, the compensation control device 410 is applied to a compensation system of a starting battery of an electric vehicle, the compensation system including a compensation control device, a power battery, a battery management system BMS, a DCDC converter, and a starting battery; the BMS comprises a power battery management system and a starting battery management system; the compensation control device 410 includes:

a response module 411 for receiving a wake-up signal, determining whether a current voltage of a starting battery of the target electric vehicle is less than a voltage threshold in response to the wake-up signal; the starting battery is used for starting a target electric vehicle to supply power to the target electric vehicle;

the power supplement module 412 is configured to, when the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, start a DCDC converter, send the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, and obtain the electric quantity of the starting battery received by the starting battery in real time in a power supplement process; the power battery is used for supplying power to the starting battery;

a judging module 413, configured to determine whether the power compensation electric quantity reaches a power compensation electric quantity threshold;

the processing module 414 is configured to, when the power compensation electric quantity reaches a power compensation electric quantity threshold, close the DCDC converter, and disconnect an electrical connection between the power battery and the DCDC converter to stop the power battery from compensating the start battery;

and the control module 415 is configured to continue to supplement power to the starting battery when the power supplement electric quantity does not reach the power supplement electric quantity threshold value until the power supplement electric quantity of the starting battery reaches the power supplement electric quantity threshold value.

Optionally, as shown in fig. 5, the compensation control device 410 further includes a first determining module 416, where the first determining module 416 is configured to:

acquiring the expected duration of the target electric vehicle in a sleep period after being powered off, the consumption current of the starting battery in the sleep period and the rated voltage of the starting battery from the starting battery management system;

Optionally, when the power supplement module 412 is configured to start a DCDC converter and send the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, the power supplement module 412 is specifically configured to:

Optionally, as shown in fig. 5, the compensation control device 410 further includes a second determining module 417, where the second determining module 417 is configured to:

Optionally, the power supply module 412 is further configured to:

The power supply control device provided by the embodiment of the application is applied to a power supply system of a starting battery of an electric vehicle, and the power supply system comprises the power supply control device, a power battery, a battery management system BMS, a DCDC converter and the starting battery; the BMS comprises a power battery management system and a starting battery management system; the compensation control device includes: a response module for receiving a wake-up signal, determining whether a current voltage of a starting battery of a target electric vehicle is less than a voltage threshold in response to the wake-up signal; the starting battery is used for starting a target electric vehicle to supply power to the target electric vehicle; the power supplementing module is used for starting a DCDC converter when the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, sending the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the power for the starting battery, and acquiring the power supplementing electric quantity received by the starting battery in real time in the power supplementing process; the power battery is used for supplying power to the starting battery; the judging module is used for determining whether the electricity supplementing electric quantity reaches an electricity supplementing electric quantity threshold value; the processing module is used for closing the DCDC converter and disconnecting the electric connection between the power battery and the DCDC converter to stop the power battery from supplementing power to the starting battery when the power supplementing electric quantity reaches a power supplementing electric quantity threshold value; and the control module is used for continuing to supplement the electricity for the starting battery when the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. As shown in fig. 6, the electronic device 600 includes a processor 610, a memory 620, and a bus 630.

The memory 620 stores machine-readable instructions executable by the processor 610, when the electronic device 600 runs, the processor 610 communicates with the memory 620 through the bus 630, and when the machine-readable instructions are executed by the processor 610, the steps of the method for starting a battery of an electric vehicle in the method embodiment shown in fig. 1 and fig. 2 may be executed.

The embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program may perform the steps of the method for charging a starting battery of an electric vehicle in the method embodiments shown in fig. 1 and fig. 2.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and the scope of the present application is not limited to the above-mentioned embodiments, although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present application and are intended to be covered by the appended claims. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The method is characterized by being applied to a power supplementing system of a starting battery of the electric vehicle, wherein the power supplementing system comprises a power supplementing control device, a power battery, a battery management system BMS, a DCDC converter and the starting battery; the BMS comprises a power battery management system and a starting battery management system; the power supplementing method comprises the following steps:

if the current voltage of a starting battery of the target electric vehicle is smaller than the voltage threshold, starting a DCDC converter, sending the electric quantity of the power battery to the starting battery through the DCDC converter so as to supplement the power for the starting battery, and acquiring the power supplement electric quantity received by the starting battery in real time in the power supplement process; the power battery is used for supplying power to the starting battery;

2. A method of supplementing electricity according to claim 1, wherein the electricity supplementing charge threshold is determined by:

3. The power supplementing method according to claim 1, wherein a DCDC converter is turned on, and the power of the power battery is sent to the starting battery through the DCDC converter to supplement power to the starting battery by the following steps:

4. A method for supplementing electricity according to claim 3, wherein the preset generated power is determined by:

5. The power supplementing method according to claim 3, further comprising:

6. The power supply control device is characterized by being applied to a power supply system of a starting battery of an electric vehicle, wherein the power supply system comprises a power supply control device, a power battery, a battery management system BMS, a DCDC converter and the starting battery; the BMS comprises a power battery management system and a starting battery management system; the compensation control device comprises:

7. The apparatus according to claim 6, further comprising a first determination module configured to:

8. The charging control device according to claim 6, wherein when the charging module is configured to turn on a DCDC converter and send the power of the power battery to the starting battery through the DCDC converter to charge the starting battery, the charging module is specifically configured to:

9. An electronic device, comprising: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, the processor and the memory communicating via the bus when the electronic device is operating, the machine-readable instructions being executed by the processor to perform the steps of the battery-powered method of an electric vehicle according to any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, performs the steps of the method for starting up battery power replenishment of an electric vehicle according to any one of claims 1 to 5.