CN114954126B

CN114954126B - Method and device for supplementing electricity to starting battery of electric vehicle

Info

Publication number: CN114954126B
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: 2024-08-30
Anticipated expiration: 2042-06-17
Also published as: CN114954126A

Abstract

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

Description

Method and device for supplementing electricity to starting battery of electric vehicle

Technical Field

The application relates to the technical field of automobiles, in particular to a method for supplementing electricity to a starting battery of an electric vehicle and a device for supplementing electricity.

Background

With the deep development of electric, intelligent and networking of automobiles, the number of automobile electric devices and controllers is increased, the energy management requirement on a 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 supplemented with electricity in time by utilizing a high-voltage battery pack and a converter.

At present, a power supply strategy mainly takes a preset power supply time length or a preset target power supply quantity of a starting battery as a power supply target to supply power to the starting battery, but when a vehicle part is aged, the power supply strategy causes frequent power supply of the starting battery and influences the power supply performance of the electric vehicle; 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

Accordingly, an object of the present application is to provide a power supply method and a power supply control device for a starting battery of an electric vehicle, which can send the electric quantity of a power battery to the starting battery through a DCDC converter to supply power to the starting battery, and acquire the received power supply quantity of the starting battery in real time during the power supply process, control the power battery to supply power to the starting battery, stop the power supply until the power supply quantity of the starting battery reaches a power supply quantity threshold value, and control the switch of the DCDC converter by determining the power supply quantity threshold value, thereby realizing the power supply control of the starting battery and improving the power supply performance of the electric vehicle.

The application mainly comprises the following aspects:

In a first aspect, an embodiment of the present application provides a method for supplementing power to a starting battery of an electric vehicle, where the method is applied to a power supplementing system of the starting battery of the electric vehicle, and the power supplementing system includes a power supplementing 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 electricity supplementing method comprises the following steps:

Receiving a wake-up signal, and determining whether the current voltage of a starting battery of a target electric vehicle is less than a voltage threshold value 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 the 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 electric quantity of the starting battery, and acquiring the electric quantity received by the starting battery in real time in the power supplementing process; the power battery is used for supplementing electricity to the starting battery;

Determining whether the power supplementing electric quantity reaches a power supplementing electric quantity threshold value;

if the electricity supplementing quantity reaches the electricity supplementing quantity threshold value, the DCDC converter is closed, and the electric connection between the power battery and the DCDC converter is disconnected 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 to the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Further, the power supply quantity threshold value is determined by the following steps:

acquiring the expected duration of the sleep period of the target electric vehicle after power-down, 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 consumed electric quantity of the starting battery in the dormant period;

Acquiring the health state of the starting battery from the starting battery management system, and determining a 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 a temperature compensation coefficient of the starting battery according to the current temperature;

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

Further, the DCDC converter is turned on, and the electric quantity of the power battery is sent to the starting battery through the DCDC converter so as to supplement electricity for the starting battery:

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

If so, determining whether an electrical connection between the power battery and the DCDC converter is on; if not, generating a control instruction and sending the control instruction to the power battery management system to finish 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 electricity for the starting battery;

If not, determining whether the target electric vehicle is a hybrid vehicle type; if the electric connection between the power battery and the DCDC converter is determined to be on, the range extender of the target electric vehicle is controlled to charge the power battery with preset generating power, the DCDC converter is started, 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 preset charging electric quantity is continuously determined.

Further, the preset generated power is determined by:

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

And acquiring the allowable charging power of the power battery, and determining the preset power generation power of the range extender according to the allowable charging power and the actual consumption power of the DCDC converter.

Further, the power supplementing method further comprises the following steps:

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

In a second aspect, an embodiment of the present application further provides an electric power supplementing control device, which is applied to an electric power supplementing system of a starting battery of an electric vehicle, where the electric power supplementing system includes the electric 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 compensation control device comprises:

A response module for receiving a wake-up signal, and determining whether the current voltage of a starting battery of the target electric vehicle is less than a voltage threshold value 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 supply 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 value, sending the electric quantity of the power battery to the starting battery through the DCDC converter so as to supply power to the starting battery, and acquiring the power supply electric quantity received by the starting battery in real time in the power supply process; the power battery is used for supplementing electricity to the starting battery;

The judging module is used for determining whether the electricity supplementing quantity reaches a electricity supplementing quantity threshold value or not;

The processing module is used for closing the DCDC converter when the electricity supplementing quantity reaches an electricity supplementing quantity threshold value, and disconnecting the power battery from the DCDC converter so as to stop the power battery from supplementing electricity to the starting battery;

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

Further, the compensation control device further comprises a first determining module, wherein the first determining module is used for:

Further, when the power supplementing module is configured to turn on the DCDC converter and send the electric quantity of the power battery to the starting battery through the DCDC converter so as to supplement power to the starting battery, the power supplementing module is specifically configured to:

In a third aspect, an embodiment of the present application further provides an electronic device, including: the system 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 is running, and the machine-readable instructions are executed by the processor to perform the steps of the method for starting the battery of the electric vehicle.

In a fourth aspect, embodiments of the present application also provide a computer readable storage medium having a computer program stored thereon, which when executed by a processor performs the steps of a method of recharging a starting battery of an electric vehicle as described above.

The embodiment of the application provides a power supplementing method and a power supplementing control device for a starting battery of an electric vehicle, which are applied to a power supplementing system of the 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 electricity supplementing method comprises the following steps: receiving a wake-up signal, and determining whether the current voltage of a starting battery of a target electric vehicle is less than a voltage threshold value 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 the 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 electric quantity of the starting battery, and acquiring the electric quantity received by the starting battery in real time in the power supplementing process; the power battery is used for supplementing electricity to the starting battery; determining whether the power supplementing electric quantity reaches a power supplementing electric quantity threshold value; if the electricity supplementing quantity reaches the electricity supplementing quantity threshold value, the DCDC converter is closed, and the electric connection between the power battery and the DCDC converter is disconnected 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 to the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

Therefore, the technical scheme provided by the application can 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, acquire the received electric quantity of the starting battery in real time in the electric supplementing process, control the power battery to supplement the electric quantity of the starting battery, stop supplementing the electric quantity until the electric quantity of the starting battery reaches the electric quantity supplementing threshold value, and control the switch of the DCDC converter through determining the electric quantity supplementing threshold value, thereby realizing the electric supplementing control of the starting battery and improving the power supply performance of the electric vehicle.

In order to make the above 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 needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flowchart of a method for recharging a start battery of an electric vehicle according to an embodiment of the present application;

Fig. 2 is a flowchart illustrating another method for recharging a start-up battery of an electric vehicle according to an embodiment of the present application;

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

FIG. 4 shows one of the block diagrams of a compensation control device according to an embodiment of the present application;

FIG. 5 shows a second block diagram of a compensation control device according to an embodiment of the present application;

Fig. 6 shows a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for the purpose of illustration and description only and are not intended to limit the scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present application. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.

In addition, the described embodiments are only some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art based on embodiments of the application without making any inventive effort, fall within the scope of the application.

In order to enable those skilled in the art to make and use the present disclosure, the following embodiments are provided in connection with a particular application scenario "battery replenishment for electric vehicle start-up", and it is within the skill of the art to apply the general principles defined herein to other embodiments and application scenarios without departing from the spirit and scope of the present disclosure.

The method, the device, the electronic equipment or the computer readable storage medium can be applied to any scene in which the power needs to be supplemented to the starting battery of the electric vehicle, the embodiment of the application is not limited to specific application scenes, and any scheme using the method, the device, the electronic equipment and the storage medium for supplementing the power to the starting battery of the electric vehicle provided by the embodiment of the application is within the protection scope of the application.

It is worth noting that with the deep development of electric, intelligent and networking of automobiles, the number of automobile electric devices and controllers is increased, 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 supplemented with power by utilizing a high-voltage battery pack and a converter in time.

Based on the above, 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 control device is applied to a power supplementing system of the starting battery of the electric vehicle, and the power supplementing system comprises the 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 electricity supplementing method comprises the following steps: receiving a wake-up signal, and determining whether the current voltage of a starting battery of a target electric vehicle is less than a voltage threshold value 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 the 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 electric quantity of the starting battery, and acquiring the electric quantity received by the starting battery in real time in the power supplementing process; the power battery is used for supplementing electricity to the starting battery; determining whether the power supplementing electric quantity reaches a power supplementing electric quantity threshold value; if the electricity supplementing quantity reaches the electricity supplementing quantity threshold value, the DCDC converter is closed, and the electric connection between the power battery and the DCDC converter is disconnected 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 to the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value.

In order to facilitate understanding of the present application, the technical solutions provided by the present application will be described in detail below with reference to specific embodiments.

Referring to fig. 1, fig. 1 is a flowchart of a method for recharging a start battery of an electric vehicle according to an embodiment of the application, as shown in fig. 1, the method includes:

S101, receiving a wake-up signal, and responding to the wake-up signal to determine whether the current voltage of a starting battery of a target electric vehicle is smaller than a voltage threshold;

in the step, the power supplementing method is applied to a power supplementing system of a starting Battery of an electric vehicle, wherein the power supplementing system comprises a power supplementing control device, namely a whole vehicle controller VCU (Vehicle Control Unit), a power Battery, a Battery management system BMS (Battery MANAGEMENT SYSTEM), a DCDC (Direct Current Direct Current) converter, a starting Battery, a range extender system, a network connection controller Tbox (Telematics box), 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 electricity for the starting battery; the DCDC converter is a device for converting a dc power supply of a certain voltage level into a dc power supply of another voltage level; the range extender system comprises an engine, an engine management system EMS (Engine Management System) and a starting and generating integrated machine ISG (INTEGRATED STARTER AND Generator); wherein, range extender system is exclusive for mixed motor vehicle type, and pure electric vehicle type does not contain range extender system.

Here, in step S101, a power supplementing control device, i.e., VCU, is used to perform the power supplementing method; the VCU receives a wake-up signal, wakes up from a 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, and if the current voltage of the starting battery of the target electric vehicle is not smaller than the voltage threshold, the VCU sleeps until the wake-up signal is received; the voltage threshold is determined by the under-voltage fault voltage of VCU plus a preset margin, e.g., the preset margin is set to 0.5V, then the voltage threshold is equal to the under-voltage fault voltage of VCU +0.5V.

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 so as to supplement the electric quantity of the starting battery, and acquiring the electric quantity received by the starting battery in real time in the power supplementing process;

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

It should be noted that, the DCDC converter is turned on through the following steps, and the electric quantity of the power battery is sent to the starting battery through the DCDC converter so as to supplement electricity to the starting battery:

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

In the step, the VCU acquires the residual electric quantity of the power battery of the target electric vehicle from the power battery management system, and determines whether the residual electric quantity of the current power battery is larger than a charging electric quantity threshold value, wherein the charging electric quantity threshold value is the lowest alarm threshold value of the state of charge (SOC) of the power battery in experimental data.

S1022, if so, determining whether the electric connection between the power battery and the DCDC converter is on; if not, generating a control instruction and sending the control instruction to the power battery management system to finish 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 electricity 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 is not required to be charged, so that whether the target electric vehicle is a hybrid electric vehicle type or not is determined, when the target electric vehicle is the hybrid electric vehicle type, the VCU determines whether the range extender of the target electric vehicle stops generating electricity through acquiring information fed back by the range extender system, if the range extender is not stopped, the VCU sends a control instruction for stopping generating electricity to the range extender system to control the range extender to stop generating electricity, after the range extender stops generating electricity, whether the power battery management system is at high voltage or not is determined, namely whether the electric connection between the power battery and the DCDC converter is switched on or not is determined, and if the electric connection between the power battery and the DCDC converter is not switched on, the control instruction 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 battery 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 electricity for the starting battery, and whether the residual electric quantity of the power battery of the target electric vehicle is larger than a charging electric quantity threshold value is continuously determined.

S1023, if not more than the target electric vehicle is a hybrid electric vehicle type; if the electric connection between the power battery and the DCDC converter is determined to be on, the range extender of the target electric vehicle is controlled to charge the power battery with preset generating power, the DCDC converter is started, 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 preset charging electric quantity is continuously determined.

In the step, when the residual electric quantity of the current power battery is smaller than or equal to a charging electric quantity threshold value, the residual electric quantity of the power battery is insufficient, and the power battery needs to be charged, and as only the hybrid vehicle type is provided with a range extender, whether the target electric vehicle is a hybrid vehicle type is determined, if the target electric vehicle is a hybrid vehicle type, whether the power battery management system is high-voltage or not is determined, namely whether the electric connection between the power battery and the DCDC converter is switched on or not is determined, if the electric connection is not switched on, a control instruction 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 on, the VCU controls the range extender of the target electric vehicle to generate electricity with preset power generation power to charge the power battery, and when the range extender charges the power battery, the VCU starts the DCDC converter, and sends the electric quantity of the power battery to the starting battery through the DCDC converter to supplement the electric quantity of the starting battery, so that whether the residual electric quantity of the power battery of the target electric vehicle is larger than a 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 a hybrid vehicle type, the VCU generates alarm information to alarm through Tbox to prompt the user that the electric quantity is insufficient, charging is required, and after the alarm is performed, the VCU stops bus communication and enters into sleep.

The preset power generation 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 actual consumed power of the DCDC converter;

in this step, the VCU obtains the input voltage and the input current of the DCDC converter, calculates the actual power consumption (actual power consumption) of the DCDC input side, and the formula is as follows:

P_DCDC＝U_DCDC×I_DCDC；

Wherein, P _DCDC is the actual power consumption of the DCDC converter; u _DCDC is the input voltage of the DCDC converter; i _DCDC is the input current of the DCDC converter.

2) And acquiring the allowable charging power of the power battery, and determining the preset power generation power of the range extender according to the allowable charging power and the actual consumption power of the DCDC converter.

In the step, the VCU obtains the real-time allowable charging power of the power battery from the power battery management system through the bus, and the 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 of the range extender; p _DCDC is the actual power consumption of the DCDC converter; p _BMS is the allowable charge power of the power battery; p _offset is the calibration offset.

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

In this step, the charge level threshold is determined based on the expected power loss of the starting battery and the temperature of the starting battery. Referring to fig. 2, fig. 2 is a flowchart of another method for recharging a starting battery of an electric vehicle according to an embodiment of the application, wherein the method for determining the recharging power threshold includes the following steps:

S201, acquiring expected duration of a sleep period after the target electric vehicle is powered down, consumed 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 consumed electric quantity of the starting battery in the dormant period;

in the step, through the experimental data of the test, the dark current consumed by the starting battery when all nodes are dormant is obtained after the whole electric vehicle is powered down, and the expected consumption electric quantity of the starting battery in the dormant period is calculated according to the following formula:

Q_{Damage to}＝U_{Forehead (forehead)}×I×h；

Wherein, Q _{Damage to} is the expected power consumption of the starting battery; u _{Forehead (forehead)} is the rated voltage of the starting battery; h is the vehicle demand parking time, i.e. the expected duration of the sleep period; i is dark current, namely the consumption current of the starting battery in the dormancy period;

S203, acquiring the health state of the starting battery from the starting battery management system, and determining a health state compensation coefficient of the starting battery according to the health state of the starting battery;

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

The SOH is a state of health of the starting battery.

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

in the step, the VCU obtains 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, Is a temperature compensation coefficient; t is the current temperature of the starting battery.

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

In this step, the formula of the power supply quantity threshold value of the starting battery is as follows:

The Q is a power supply capacity threshold of the starting battery, and the order of acquiring the current temperature of the starting battery, the state of health of the starting battery, the expected duration of the sleep period after the target electric vehicle is powered down, the consumption current of the starting battery in the sleep period, and the rated voltage of the starting battery is not limited, and can be acquired by multiple threads at the same time or in any order.

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

In the step, when the electricity supplementing quantity reaches the electricity supplementing quantity threshold value, the VCU controls the DCDC converter to be closed, generates a control instruction of lower high voltage and sends the control instruction to the power battery management system to finish the lower high voltage operation so as to disconnect the electric connection between the power battery and the DCDC converter, and the power battery stops supplementing electricity to the starting battery; here, if the hybrid vehicle type is used, after the electric connection between the power battery and the DCDC converter is disconnected, the VCU needs to determine whether the range extender of the target electric vehicle stops generating electricity by acquiring the information fed back by the range extender system, if the power is not stopped, the VCU sends a control instruction for stopping generating electricity to the range extender system to control the range extender to stop generating electricity, and after the range extender is determined to stop generating electricity, the VCU stops bus communication and enters into sleep.

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

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

The power supplementing method of the starting battery of the electric vehicle is applied to a power supplementing system of 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 electricity supplementing method comprises the following steps: receiving a wake-up signal, and determining whether the current voltage of a starting battery of a target electric vehicle is less than a voltage threshold value 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 the 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 electric quantity of the starting battery, and acquiring the electric quantity received by the starting battery in real time in the power supplementing process; the power battery is used for supplementing electricity to the starting battery; determining whether the power supplementing electric quantity reaches a power supplementing electric quantity threshold value; if the electricity supplementing quantity reaches the electricity supplementing quantity threshold value, the DCDC converter is closed, and the electric connection between the power battery and the DCDC converter is disconnected 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 to 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 conception, the embodiment of the application also provides a power supplementing control device corresponding to the power supplementing method of the starting battery of the electric vehicle, and because the principle of solving the problem of the device in the embodiment of the application is similar to that of the power supplementing method of the starting battery of the electric vehicle, the implementation of the device can refer to the implementation of the method, and the repetition is omitted.

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

A response module 411 for receiving a wake-up signal, and determining whether a current voltage of a start-up 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 supply module 412 is configured to, when the current voltage of the starting battery of the target electric vehicle is less than the voltage threshold, turn on a DCDC converter, send the electric quantity of the power battery to the starting battery through the DCDC converter to supply power to the starting battery, and obtain the power supply electric quantity received by the starting battery in real time during the power supply process; the power battery is used for supplementing electricity to the starting battery;

a judging module 413, configured to determine whether the power supply capacity reaches a power supply capacity threshold;

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

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:

Optionally, when the power recharging module 412 is configured to turn on the DCDC converter and send the electric quantity of the power battery to the starting battery through the DCDC converter to recharge the starting battery, the power recharging 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:

And acquiring the allowable charging power of the power battery, and determining the preset power generation power of the range extender according to the allowable charging power and the actual power consumption of the DCDC converter.

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

The embodiment of the application provides a power compensation control device which is applied to a power compensation system of a starting battery of an electric vehicle, wherein the power compensation system comprises the power compensation 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, and determining whether the current voltage of a starting battery of the target electric vehicle is less than a voltage threshold value 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 supply 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 value, sending the electric quantity of the power battery to the starting battery through the DCDC converter so as to supply power to the starting battery, and acquiring the power supply electric quantity received by the starting battery in real time in the power supply process; the power battery is used for supplementing electricity to the starting battery; the judging module is used for determining whether the electricity supplementing quantity reaches a electricity supplementing quantity threshold value or not; the processing module is used for closing the DCDC converter when the electricity supplementing quantity reaches an electricity supplementing quantity threshold value, and disconnecting the power battery from the DCDC converter so as to stop the power battery from supplementing electricity to the starting battery; and the control module is used for continuing to supplement electricity to the starting battery when the electricity supplementing quantity does not reach the electricity supplementing quantity threshold value until the electricity supplementing quantity of the starting battery reaches the electricity supplementing quantity threshold value.

Referring to fig. 6, fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the application. 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 is running, 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 recharging the starting battery of the electric vehicle in the method embodiments shown in fig. 1 and fig. 2 can be executed, and detailed description of the method embodiments will be omitted.

The embodiment of the present application further provides 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 steps of the method for recharging the starting battery of the electric vehicle in the method embodiments shown in fig. 1 and fig. 2 can be executed, and the specific implementation manner can refer to the method embodiments and will not be repeated herein.

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

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in 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 this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Finally, it should be noted that: the above examples are only specific embodiments of the present application, and are not intended to limit the scope of the present application, but it should be understood by those skilled in the art that the present application is not limited thereto, and that the present application is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. The method for supplementing the power of the starting battery of the electric vehicle is characterized by being applied to a power supplementing system of the 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 electricity supplementing method comprises the following steps:

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 electricity for the starting battery:

If not, determining whether the target electric vehicle is a hybrid vehicle type; if the electric connection between the power battery and the DCDC converter is determined to be on, controlling a range extender of the target electric vehicle to charge the power battery with preset power generation power, starting the 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 continuously determining whether the residual electric quantity of the power battery of the target electric vehicle is larger than the preset charge electric quantity;

If the electricity supplementing electric quantity does not reach the electricity supplementing electric quantity threshold value, continuing to supplement electricity to the starting battery until the electricity supplementing electric quantity of the starting battery reaches the electricity supplementing electric quantity threshold value;

determining a power replenishment capacity threshold by:

2. The power supply method according to claim 1, wherein the preset generated power is determined by:

3. The power up method according to claim 1, further comprising:

4. A power supplementing control device is characterized by being applied to a power supplementing system of a starting battery of an electric vehicle, wherein the power supplementing system comprises the 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 compensation control device comprises:

The power supplementing module is used for starting the DCDC converter, sending the electric quantity of the power battery to the starting battery through the DCDC converter so as to supplement power to the starting battery, and the power supplementing module is specifically used for:

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

the compensation control device further comprises a first determining module, wherein the first determining module is used for:

5. 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 in communication over the bus when the electronic device is operating, the machine readable instructions when executed by the processor performing the steps of the method of powering up a battery of an electric vehicle according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the method for recharging a start-up battery of an electric vehicle according to any one of claims 1 to 3.