CN117341542A - Power battery heat preservation control method, device, storage medium and equipment - Google Patents

Abstract

In the method, when a battery is in a full state in a charging process, whether a thermal insulation condition is met is judged according to the battery temperature, the ambient temperature, the charging residual time and the maximum driving power of the battery, when the thermal insulation condition is met, a heater is controlled to stop working, a battery management system is requested to disconnect a high-voltage relay, a vehicle-mounted charger is controlled to enter a charging mode, a charging pile is controlled to keep zero output, when the state of the high-voltage relay fed back by the battery management system is disconnected, the heater is controlled to enter a heating mode, and a charging current value output by the charging pile is controlled according to a working gear of the heater. Therefore, in the heat preservation process, the high-voltage relay is in a disconnected state, and the energy required by the heater is provided by the charging pile, so that the problems of battery overcharge and overcurrent possibly caused by output fluctuation of the heater and the charging pile are prevented, and the safety of the battery is ensured.

Description

Power battery heat preservation control method, device, storage medium and equipment

Technical Field

The application relates to the technical field of battery heat preservation, in particular to a power battery heat preservation control method, a device, a storage medium and equipment.

Background

The available electric quantity of the power battery of the electric automobile is reduced under the low-temperature condition, so that the endurance mileage is greatly shortened, and therefore, in order to avoid the endurance shortening during running in winter, certain heat preservation measures are adopted for the battery in industry. The prior heat preservation measures can be divided into two types, namely passive heat preservation and active heat preservation, wherein the passive heat preservation is to arrange heat preservation materials inside and outside the power battery, and the active heat preservation is to maintain the temperature of the battery in a mode of heating the battery.

At present, in the active heat preservation process of an electric automobile, a power battery is used for providing electric energy for a vehicle-mounted heater, the heater is started to enter heating after the temperature of the battery is lower than a target lower limit value, the heater is closed to exit heating after the temperature of the battery is higher than a target upper limit value, and the heater is restarted when the temperature of the battery is reduced to be lower than the target lower limit value. In the process, if the power battery consumption exceeds a certain value, the battery can be re-charged, and when charging and heating are performed simultaneously, the condition of overcharge or overcurrent of the battery is easy to occur due to the fluctuation of the output currents of the heater and the charging pile, so that the safety of the battery is not facilitated.

Disclosure of Invention

The invention aims to provide a power battery heat preservation control method, a device, a storage medium and equipment, and aims to solve the problems that the battery is easy to overcharge or overcurrent and the safety of the battery is not facilitated due to the active heat preservation mode of the power battery in the related technology.

In a first aspect, the present application provides a power battery thermal insulation control method, including: in the charging process of the power battery, when the power battery is in a full state, judging whether a heat preservation condition is met according to the current battery temperature, the ambient temperature, the charging residual time and the maximum driving power of the battery; the charging remaining time is determined based on the vehicle using time submitted by the user and the current time; if the judgment result is yes, after the vehicle-mounted heater is controlled to stop working, the battery management system is requested to disconnect the high-voltage relay, the vehicle-mounted charger is controlled to enter a charging mode, and the charging pile is controlled to keep zero output; the battery management system controls the on-off of a loop between the power battery and the vehicle-mounted heater and the on-off of a loop between the power battery and the vehicle-mounted charger through the high-voltage relay; when the state of the high-voltage relay fed back by the battery management system is disconnected, the vehicle-mounted heater is controlled to enter a heating mode, and the charging current value output by the charging pile is controlled according to the working gear of the vehicle-mounted heater.

In the implementation process, in the charging process of the power battery, when the power battery is in a full state, judging whether a heat preservation condition is met according to the battery temperature, the ambient temperature, the charging residual time and the maximum driving power of the battery, and when the heat preservation condition is met, controlling the heater to stop working, requesting the battery management system to disconnect the high-voltage relay, controlling the vehicle-mounted charger to enter a charging mode, controlling the charging pile to keep zero output, and controlling the heater to enter a heating mode when the state of the high-voltage relay fed back by the battery management system is disconnected, and controlling the charging current value output by the charging pile according to the working gear of the heater. So, at the in-process of heat preservation, high-voltage relay is in the state of disconnection, and the energy that the heater needs is all provided by charging the stake to prevent that the heater and charging the fluctuation of stake output from probably leading to power battery to appear overcharging and overcurrent problem, guarantee battery safety.

Further, in some examples, before determining whether the thermal insulation condition is satisfied according to the current battery temperature, the ambient temperature, the charging remaining time, and the maximum driving power of the battery, the method includes: when the maximum driving power of the battery is lower than a first power value and the temperature of the battery is lower than a first temperature value, heat preservation reminding information is sent to a user terminal, so that a user submits the vehicle-using time on the user terminal according to the heat preservation reminding information; and determining the charging remaining time based on the difference between the user time and the current time sent by the user terminal.

In the above implementation, a specific way of obtaining the remaining charging time is provided.

Further, in some examples, the determining whether the thermal insulation condition is satisfied according to the current battery temperature, the ambient temperature, the charging remaining time and the maximum driving power of the battery includes: determining the time required for heating the maximum driving power of the battery to a second power value according to the current battery temperature, the environment temperature and the maximum driving power of the battery, and recording the determined time as heating requirement time; and comparing the charging remaining time with the heating demand time, and judging whether the heat preservation condition is met according to the comparison result, the current battery temperature and the maximum driving power of the battery.

In the implementation process, a specific mode for judging whether the vehicle needs to enter the heat preservation mode is provided, namely, the heating demand time is determined first, and then the battery temperature, the maximum driving power of the battery and the charging remaining time are combined to judge.

Further, in some examples, the determining whether the thermal insulation condition is satisfied according to the comparison result, the current battery temperature and the maximum driving power of the battery includes: and when the comparison result shows that the charging remaining time is smaller than or equal to the heating demand time, the battery temperature is lower than a first temperature value, and the maximum driving power of the battery is lower than a first power value, judging that the heat preservation condition is met.

In the implementation process, the heat preservation condition can be that the remaining time of charging is less than or equal to the heating demand time, the temperature of the battery is lower than a first temperature value, and the maximum driving power of the battery is lower than a first power value, so that the heat preservation requirement of the battery can be met, and only one heating occurs in the heat preservation process as much as possible, thereby reducing the extra consumption of electric quantity caused by multiple heating.

Further, in some examples, the method further comprises: after the charging current value output by the charging pile is controlled according to the working gear of the vehicle-mounted heater, judging whether an exit condition is met or not according to the re-acquired battery temperature, charging residual time, heating demand time and maximum driving power of the battery; and when the exit condition is met, requesting the vehicle-mounted heater to exit the heating mode, requesting the battery management system to disconnect the high-voltage relay, and requesting the vehicle-mounted charger to enter a standby mode.

In the implementation process, in the heat preservation process, the VCU can acquire parameters such as the battery temperature, the charging remaining time, the heating demand time and the maximum driving power of the battery in real time or periodically, so as to judge whether the exit condition is met, and when the judgment result is yes, the vehicle is controlled to exit the heat preservation mode, so that the reliability of vehicle control is improved.

Further, in some examples, the exit condition includes at least one of: the charging remaining time is longer than the heating demand time; the maximum driving power of the battery is higher than the second power value; the battery temperature is higher than the second temperature value.

In the implementation process, when the charging remaining time is longer than the heating demand time, or the maximum driving power of the battery is higher than the second power value, or the temperature of the battery is higher than the second temperature value, the VCU controls the vehicle to exit the heat preservation mode, so that the extra consumption of electric quantity caused by multiple times of heating in the heat preservation process can be reduced, and the safety of battery heating can be ensured.

Further, in some examples, the first temperature value is 0 ℃; the second temperature value is 15 ℃; the first power value is 30kW; the second power value is 50kW.

In the above implementation, selectable settings for the first temperature value, the second temperature value, the first power value, and the second power value are provided.

In a second aspect, the present application provides a power battery thermal insulation control device, including: the judging module is used for judging whether the heat preservation condition is met according to the current battery temperature, the environment temperature, the charging residual time and the maximum driving power of the battery when the power battery is in a full state in the charging process of the power battery; the charging remaining time is determined based on the vehicle using time submitted by the user and the current time; the request module is used for requesting the battery management system to disconnect the high-voltage relay and controlling the vehicle-mounted charger to enter a charging mode and controlling the charging pile to keep zero output after controlling the vehicle-mounted heater to stop working if the judgment result is yes; the battery management system controls the on-off of a loop between the power battery and the vehicle-mounted heater and the on-off of a loop between the power battery and the vehicle-mounted charger through the high-voltage relay; and the control module is used for controlling the vehicle-mounted heater to enter a heating mode when the state of the high-voltage relay fed back by the battery management system is disconnected, and controlling the charging current value output by the charging pile according to the working gear of the vehicle-mounted heater.

In a third aspect, the present application provides an electronic device, including: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to any one of the first aspects when the computer program is executed.

In a fourth aspect, the present application provides a computer readable storage medium having instructions stored thereon, which when run on a computer, cause the computer to perform the method according to any of the first aspects.

In a fifth aspect, the present application provides a computer program product which, when run on a computer, causes the computer to perform the method according to any one of the first aspects.

Additional features and advantages of the disclosure will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the techniques disclosed herein.

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 of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and 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 power battery thermal insulation control method provided in an embodiment of the present application;

fig. 2 is a schematic diagram of a circuit system for implementing a charging function and a heating function on an automobile according to an embodiment of the present application;

fig. 3 is a schematic diagram of a workflow of an electric vehicle ac charging power battery thermal insulation control scheme according to an embodiment of the present application;

fig. 4 is a block diagram of a power battery thermal insulation control device according to an embodiment of the present application;

fig. 5 is a block diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.

As described in the background art, the active heat preservation mode of the power battery in the related art has the problem that the battery is easy to be overcharged or overcurrent and is not beneficial to the safety of the battery. Based on this, the embodiment of the application provides a power battery thermal insulation control scheme to solve the above-mentioned problems.

The embodiments of the present application are described below:

as shown in fig. 1, fig. 1 is a flowchart of a power battery thermal insulation control method according to an embodiment of the present application. The method is applied to a vehicle controller (Vehicle Control Unit, VCU) of the electric vehicle.

The method comprises the following steps:

step 101, in the charging process of the power battery, when the power battery is in a full state, judging whether a heat preservation condition is met according to the current battery temperature, the ambient temperature, the charging residual time and the maximum driving power of the battery; the charging remaining time is determined based on the vehicle using time submitted by the user and the current time;

in this embodiment, the power battery may be a lithium ion battery, which may be charged using an ac charging stake. The user connects the charging gun with the vehicle, and after the card is swiped on the charging pile, the VCU judges whether the vehicle has a fault or not and whether the battery is full or not, and when the judgment result is negative, the VCU controls the vehicle to enter a charging flow. In the charging process, the VCU may acquire the battery temperature collected in real time by the BMS (Battery Management System ) and the ambient temperature collected in real time by the temperature sensor module, such as ITS (Infrared Temperature Sensor ), so as to determine whether the battery needs to be heated, and determine that the battery is in a full state when the BMS reports the full flag bit, and further determine whether to enter a thermal insulation mode according to the battery temperature, the ambient temperature, the charging remaining time and the maximum driving power of the battery.

The maximum driving power of the battery referred to in this step is also referred to as the maximum output power of the battery, which may be calculated by the BMS based on the battery capacity and the cell voltage and reported to the VCU. The remaining charge time mentioned in this step is determined based on the time of use submitted by the user and the current time, where the time of use can be considered as the time when the user disconnects the connection between the charging gun and the vehicle. The time of use may be a request submitted by the user when the VCU controls the vehicle to enter a charging process. Considering that the user's demand for vehicles may find a change in the charging process, in order to obtain a more accurate remaining charging time, in some embodiments, before determining whether the thermal insulation condition is met according to the current battery temperature, the ambient temperature, the remaining charging time and the maximum driving power of the battery, the method may include: when the maximum driving power of the battery is lower than a first power value and the temperature of the battery is lower than a first temperature value, heat preservation reminding information is sent to a user terminal, so that a user submits the vehicle-using time on the user terminal according to the heat preservation reminding information; and determining the charging remaining time based on the difference between the user time and the current time sent by the user terminal. That is, when the maximum driving power of the battery reported by the BMS is lower than the first power value and the temperature of the battery is lower than the first temperature value, the VCU pushes the heat preservation reminder to the user mobile phone APP, and the user submits the time for use and the heat preservation request at the mobile phone APP according to the reminder, so that the VCU can calculate and obtain the remaining time for charging according to the difference between the time for use and the current time, for example, the time for use submitted by the user is 14:30, and the current time is 14:10, the remaining charge time can be calculated to be 20 minutes. Therefore, the judgment accuracy of whether the vehicle meets the heat preservation condition is improved.

In some embodiments, the determining whether the thermal insulation condition is satisfied according to the current battery temperature, the ambient temperature, the charging remaining time and the maximum driving power of the battery includes: determining the time required for heating the maximum driving power of the battery to a second power value according to the current battery temperature, the environment temperature and the maximum driving power of the battery, and recording the determined time as heating requirement time; and comparing the charging remaining time with the heating demand time, and judging whether the heat preservation condition is met according to the comparison result, the current battery temperature and the maximum driving power of the battery. That is, the VCU may determine the time required for heating the maximum battery driving power to the second power value, that is, the heating demand time, according to the current battery temperature, the ambient temperature and the maximum battery driving power, so as to determine whether to enter the thermal insulation mode by combining the remaining charging time, the battery temperature and the maximum battery driving power. The maximum driving power of the power battery is affected by the temperature of the battery, when the battery is heated, the temperature of the battery rises, the maximum driving power of the battery also rises, and under the working conditions of different environment temperatures, different battery temperatures and different maximum driving power of the battery, the time required for heating the maximum driving power of the battery to the second power value can be obtained through real vehicle calibration or environment cabin laboratory calibration, so that when judging whether the heat preservation condition is met, the heating demand time can be determined according to the actual battery temperature, the environment temperature and the maximum driving power of the battery.

Further, in some embodiments, the foregoing determining whether the thermal insulation condition is satisfied according to the comparison result, the current battery temperature, and the maximum driving power of the battery may include: and when the comparison result shows that the charging remaining time is smaller than or equal to the heating demand time, the battery temperature is lower than a first temperature value, and the maximum driving power of the battery is lower than a first power value, judging that the heat preservation condition is met. That is, the heat preservation condition may be that the remaining charging time is less than or equal to the heating demand time, the battery temperature is lower than the first temperature value, and the maximum driving power of the battery is lower than the first power value, so that the heat preservation requirement of the battery can be satisfied, and only one heating occurs in the heat preservation process as much as possible, thereby reducing the extra consumption of electric quantity caused by multiple heating.

Step 102, if the judgment result is yes, after the vehicle-mounted heater is controlled to stop working, the battery management system is requested to disconnect the high-voltage relay, the vehicle-mounted charger is controlled to enter a charging mode, and the charging pile is controlled to keep zero output; the battery management system controls the on-off of a loop between the power battery and the vehicle-mounted heater and the on-off of a loop between the power battery and the vehicle-mounted charger through the high-voltage relay.

The in-vehicle heater mentioned in this step is a device for heating the inside of an automobile, and at present, an electric automobile generally heats a cabin by HVH (High Voltage Heater, high-voltage electric heater) as the in-vehicle heater. HVH is typically composed of three parts, a blower, a heater, and a control circuit. The On Board Charger (OBC) mentioned in this step is a charger fixedly mounted On an electric vehicle, which can directly Charge the battery of the vehicle.

In this embodiment, when the VCU determines that the vehicle meets the heat preservation condition, the VCU sends a corresponding request to HVH, BMS, OBC and the charging pile, so that the vehicle enters the heat preservation mode. Referring to fig. 2, fig. 2 is a schematic diagram of a circuit system for implementing a charging function and a heating function on an automobile provided in an embodiment of the present application, where the circuit system includes an OBC21, an HVH22, a power battery 23 and a high voltage relay 24 (in practical application, the positive and negative electrodes of the battery may be connected to one high voltage relay respectively, only one of which is shown in the drawing), the OBC21 is connected to an ac charging pile 26 through an S2 switch 25, and the S2 switch 25 is an important component of the ac charging pile 26, and is used for controlling the start and end of a charging process, and when the OBC21 enters a charging mode, the S2 switch 25 is closed. In this circuit system, the OBC21 is connected to the HVH22 and the power battery 23, respectively, and the high voltage relay 24 is in the circuit between the HVH22 and the power battery 23, and its state is controlled by the BMS. When the vehicle enters a charging procedure, the VCU requests the BMS to close the high voltage relay 24, requesting the OBC21 to enter a charging mode.

The method comprises the following steps: when the heat preservation condition is met, the VCU requests the HVH to firstly exit the heating mode, and limits the power consumption of the HVH to 0; after the HVH stops working, the VCU requests the BMS to disconnect the high-voltage relay, and requests the OBC to enter a charging mode, and controls the current output of the charging pile to be 0A. Therefore, the protection of each part is realized, and the safety of the vehicle entering a heat preservation mode in the charging process is improved.

And 103, when the state of the high-voltage relay fed back by the battery management system is disconnected, controlling the vehicle-mounted heater to enter a heating mode, and controlling a charging current value output by the charging pile according to the working gear of the vehicle-mounted heater.

The method comprises the following steps: when the BMS sends out the information that the state of the high-voltage relay is open, the VCU requests the HVH to enter a heating mode, calculates a charging current value according to the HVH heating working gear, and requests the charging pile to output. At this moment, in the process of keeping warm, high voltage relay is in the state of disconnection, and the energy that HVH needs is all provided by the electric pile that fills, can avoid power battery to be in the state of charge in the process of keeping warm like this, prevents that HVH and electric pile output fluctuation from probably leading to power battery to appear overcharging and overcurrent problem, guarantees battery charging safety.

Also, in some embodiments, the above method may further comprise: after the charging current value output by the charging pile is controlled according to the working gear of the vehicle-mounted heater, judging whether an exit condition is met or not according to the re-acquired battery temperature, charging residual time, heating demand time and maximum driving power of the battery; and when the exit condition is met, requesting the vehicle-mounted heater to exit the heating mode, requesting the battery management system to disconnect the high-voltage relay, and requesting the vehicle-mounted charger to enter a standby mode. That is, during the heat preservation process, the VCU may acquire the foregoing several parameters in real time or periodically, so as to determine whether the exit condition is satisfied, and when determining that the exit condition is satisfied, the VCU requests the HVH to exit the heating mode, requests the BMS to open the high voltage relay, requests the OBC to exit the working mode and enter the standby mode. In this way, in the heat preservation process, if the demand of the user for the vehicle changes, or the temperature and the maximum driving power of the battery increase too fast during heating, the vehicle can judge whether the exit condition is met or not, and exit the heat preservation mode when the exit condition is met, so that the reliability of vehicle control is improved.

Further, the aforementioned exit condition may include at least one of: the charging remaining time is longer than the heating demand time; the charging remaining time is longer than the heating demand time; the maximum driving power of the battery is higher than the second power value; the battery temperature is higher than the second temperature value. That is, when the charge remaining time is greater than the heating demand time, or the battery maximum driving power is higher than the second power value, or the battery temperature is higher than the second temperature value, the VCU controls the vehicle to exit the warm mode. Therefore, the extra consumption of electric quantity caused by multiple times of heating in the heat preservation process can be reduced, and the safety of battery heating can be ensured.

Wherein the aforementioned first temperature value may be 0 ℃; the second temperature value may be 15 ℃; the first power value may be 30kW; the second power value may be 50kW. Experiments prove that through the arrangement, the requirements of users on the aspects of endurance mileage, dynamic performance, electricity cost and the like of the vehicle can be fully met. Of course, in other embodiments, these values may be set differently according to the needs of a particular scenario.

In the charging process of the power battery, when the power battery is in a full state, whether a heat preservation condition is met or not is judged according to the battery temperature, the ambient temperature, the charging residual time and the maximum driving power of the battery, when the heat preservation condition is met, after the heater is controlled to stop working, the battery management system is requested to disconnect the high-voltage relay, the vehicle-mounted charger is controlled to enter a charging mode, the charging pile is controlled to keep zero output, when the state of the high-voltage relay fed back by the battery management system is disconnected, the heater is controlled to enter a heating mode, and the charging current value output by the charging pile is controlled according to the working gear of the heater. So, at the in-process of heat preservation, high-voltage relay is in the state of disconnection, and the energy that the heater needs is all provided by charging the stake to prevent that the heater and charging the fluctuation of stake output from probably leading to power battery to appear overcharging and overcurrent problem, guarantee battery safety.

For a more detailed description of the solution of the present application, a specific embodiment is described below:

the embodiment provides an electric automobile alternating-current charging power battery heat preservation control scheme. Prior to the present embodiment, the power battery thermal insulation technology in the related art has the following drawbacks: firstly, in the heat preservation process, the condition that the battery is charged and heated simultaneously exists, when the battery is in a state close to full charge, and the charging and the heating are carried out simultaneously, the output currents of the heater and the charging pile have the fluctuation characteristic, so that the condition that the battery is overcharged or overflowed is easily caused, and the safety of the battery is not facilitated; secondly, battery electric quantity is consumed in the heat preservation process, and the situation of non-full electricity of the battery electric quantity can occur in the heat preservation process or when the heat preservation is finished, so that the driving mileage of the whole vehicle is easily influenced; third, there is the circulation condition of heating-standing cooling-heating in the heat preservation process, and more electric quantity can be consumed by multiple times of heating. And the present embodiment aims to solve the above-described problems.

The workflow of the embodiment is shown in fig. 3, and includes:

s301, connecting a charging gun with a vehicle by a user, and after swiping a card on a charging pile, judging whether a charging condition is met by a VCU, if so, executing S302, otherwise;

wherein the charging condition includes no failure of the vehicle and the battery being in an underfilled state;

s302, entering a charging process, wherein the VCU requests the BMS to close a high-voltage relay and requests the OBC to enter a charging mode;

s303, the VCU acquires battery temperature acquired by the BMS in real time and environment temperature acquired by the ITS in real time;

s304, the VCU judges whether the battery needs to be heated according to the battery temperature and the environment temperature, if yes, S305 is executed, otherwise S303 is returned;

s305, the VCU requests the HVH to enter a heating mode;

s306, when the battery is in a full state, the VCU receives a full flag bit reported by the BMS;

s307, the VCU judges whether the thermal insulation mode needs to be entered according to the battery temperature, the environment temperature and the maximum driving power of the battery, if yes, S308 is executed, otherwise S310 is executed;

wherein, the judging conditions for entering the heat preservation mode are as follows: when the BMS reports that the maximum driving power of the battery is lower than P1 and the temperature of the battery is lower than T1, the VCU pushes the heat preservation reminding to the mobile phone APP of the user so as to obtain the time for the user to use and the heat preservation request submitted by the mobile phone APP according to the reminding, the VCU calculates the difference value T1 between the time for the user and the current time, in addition, the VCU determines the time T2 required for heating the maximum driving power of the battery to P2 according to the current environment temperature, the battery temperature and the maximum driving power of the battery, and the time can be obtained through calibration of a real vehicle or a battery pack in an environment cabin laboratory; when T1 is less than or equal to T2, the maximum driving power of the battery is lower than P1, and the temperature of the battery is lower than T1, judging that the heat preservation condition is met, and entering a heat preservation mode; in addition, the vehicle-using time can be preset by a user when the mobile phone APP end actively starts the heat preservation function;

s308, the VCU requests the HVH to exit the heating mode firstly, limits the power consumption of the HVH to 0, and requests the BMS to disconnect the high-voltage relay after the HVH stops working, requests the OBC to enter the charging mode, and controls the current output of the charging pile to be 0A; when the BMS sends out that the state of the high-voltage relay is off, the VCU requests the HVH to enter a heating mode, calculates a charging current value according to the HVH heating working gear, and requests the charging pile to output;

s309, in the heat preservation process, judging whether an exit condition is met, if yes, executing S310, otherwise, executing S311;

when T1 is more than T2, or the maximum driving power of the battery is higher than P2, or the temperature of the battery is higher than T2, judging that the exit condition is met;

s310, the VCU requests the HVH to exit the heating mode, requests the BMS to disconnect the high-voltage relay, requests the OBC to exit the working mode and enters the standby mode;

s311, after waiting for the preset time, returning to S309;

s312, sending a message indicating the charging failure to the user mobile phone APP.

In the scheme of the embodiment, in the process of heat preservation, the high-voltage relay is maintained in an off state, and all the energy required by the HVH is provided by the charging pile. Therefore, the power battery can be prevented from being in a charging state in the heat preservation process, the problems that the power battery is overcharged and overcurrent are possibly caused by the fluctuation of the output of the HVH and the charging pile are prevented, and the charging safety of the battery is ensured. In addition, the battery is not required to output energy in the heat preservation process, and the heat preservation process does not have redundant electric energy wasted in the heating process, so that the battery is in a full-power state in the heat preservation process and the heat preservation process is finished, the output power of the battery is not limited, and the vehicle can be ensured to meet the requirements of the user on driving mileage, power performance and electricity cost saving.

Corresponding to the embodiment of the method, the application also provides an embodiment of the power battery heat preservation control device and a terminal applied by the power battery heat preservation control device:

as shown in fig. 4, fig. 4 is a block diagram of a power battery thermal insulation control device according to an embodiment of the present application, where the device includes:

the judging module 41 is configured to judge whether a thermal insulation condition is satisfied according to a current battery temperature, an ambient temperature, a charging remaining time and a maximum driving power of the battery when the power battery is in a full state during a charging process of the power battery; the charging remaining time is determined based on the vehicle using time submitted by the user and the current time;

the control module 42 is configured to request the battery management system to disconnect the high-voltage relay, and control the vehicle-mounted charger to enter a charging mode and control the charging pile to maintain zero output after the vehicle-mounted heater is controlled to stop working if the determination result is yes; the battery management system controls the on-off of a loop between the power battery and the vehicle-mounted heater and the on-off of a loop between the power battery and the vehicle-mounted charger through the high-voltage relay;

the control module 42 is further configured to control the on-vehicle heater to enter a heating mode when the state of the high-voltage relay fed back by the battery management system is off, and control a charging current value output by the charging pile according to a working gear of the on-vehicle heater.

The implementation process of the functions and roles of each module in the above device is specifically shown in the implementation process of the corresponding steps in the above method, and will not be described herein again.

The application further provides an electronic device, please refer to fig. 5, and fig. 5 is a block diagram of an electronic device according to an embodiment of the application. The electronic device may include a processor 510, a communication interface 520, a memory 530, and at least one communication bus 540. Wherein the communication bus 540 is used to enable direct connection communication for these components. The communication interface 520 of the electronic device in the embodiment of the present application is used for performing signaling or data communication with other node devices. Processor 510 may be an integrated circuit chip with signal processing capabilities.

The processor 510 may be a general-purpose processor, including a central processing unit (CPU, central Processing Unit), a network processor (NP, network Processor), etc.; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor 510 may be any conventional processor or the like.

The Memory 530 may be, but is not limited to, random access Memory (RAM, random Access Memory), read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable Read Only Memory (EEPROM, electric Erasable Programmable Read-Only Memory), and the like. The memory 530 has stored therein computer readable instructions which, when executed by the processor 510, may cause an electronic device to perform the steps described above in relation to the method embodiment of fig. 1.

Optionally, the electronic device may further include a storage controller, an input-output unit.

The memory 530, the memory controller, the processor 510, the peripheral interface, and the input/output unit are electrically connected directly or indirectly to each other, so as to realize data transmission or interaction. For example, the elements may be electrically coupled to each other via one or more communication buses 540. The processor 510 is configured to execute executable modules stored in the memory 530, such as software functional modules or computer programs included in the electronic device.

The input-output unit is used for providing the user with the creation task and creating the starting selectable period or the preset execution time for the task so as to realize the interaction between the user and the server. The input/output unit may be, but is not limited to, a mouse, a keyboard, and the like.

It will be appreciated that the configuration shown in fig. 5 is merely illustrative, and that the electronic device may also include more or fewer components than shown in fig. 5, or have a different configuration than shown in fig. 5. The components shown in fig. 5 may be implemented in hardware, software, or a combination thereof.

The embodiment of the application further provides a storage medium, where instructions are stored, and when the instructions run on a computer, the computer program is executed by a processor to implement the method described in the method embodiment, so that repetition is avoided, and no further description is given here.

The present application also provides a computer program product which, when run on a computer, causes the computer to perform the method of the method embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners as well. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.

The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such 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, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in 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 (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. The power battery heat preservation control method is characterized by comprising the following steps of:

in the charging process of the power battery, when the power battery is in a full state, judging whether a heat preservation condition is met according to the current battery temperature, the ambient temperature, the charging residual time and the maximum driving power of the battery; the charging remaining time is determined based on the vehicle using time submitted by the user and the current time;

if the judgment result is yes, after the vehicle-mounted heater is controlled to stop working, the battery management system is requested to disconnect the high-voltage relay, the vehicle-mounted charger is controlled to enter a charging mode, and the charging pile is controlled to keep zero output; the battery management system controls the on-off of a loop between the power battery and the vehicle-mounted heater and the on-off of a loop between the power battery and the vehicle-mounted charger through the high-voltage relay;

when the state of the high-voltage relay fed back by the battery management system is disconnected, the vehicle-mounted heater is controlled to enter a heating mode, and the charging current value output by the charging pile is controlled according to the working gear of the vehicle-mounted heater.

2. The method of claim 1, wherein before determining whether the thermal insulation condition is satisfied based on the current battery temperature, the ambient temperature, the charge remaining time, and the maximum driving power of the battery, comprises:

when the maximum driving power of the battery is lower than a first power value and the temperature of the battery is lower than a first temperature value, heat preservation reminding information is sent to a user terminal, so that a user submits the vehicle-using time on the user terminal according to the heat preservation reminding information;

and determining the charging remaining time based on the difference between the user time and the current time sent by the user terminal.

3. The method of claim 1, wherein determining whether the thermal insulation condition is satisfied based on the current battery temperature, the ambient temperature, the charge remaining time, and the maximum driving power of the battery comprises:

determining the time required for heating the maximum driving power of the battery to a second power value according to the current battery temperature, the environment temperature and the maximum driving power of the battery, and recording the determined time as heating requirement time;

and comparing the charging remaining time with the heating demand time, and judging whether the heat preservation condition is met according to the comparison result, the current battery temperature and the maximum driving power of the battery.

4. The method of claim 3, wherein determining whether the thermal insulation condition is satisfied based on the comparison result, the current battery temperature, and the maximum driving power of the battery comprises:

and when the comparison result shows that the charging remaining time is smaller than or equal to the heating demand time, the battery temperature is lower than a first temperature value, and the maximum driving power of the battery is lower than a first power value, judging that the heat preservation condition is met.

5. The method according to claim 4, wherein the method further comprises:

after the charging current value output by the charging pile is controlled according to the working gear of the vehicle-mounted heater, judging whether an exit condition is met or not according to the re-acquired battery temperature, charging residual time, heating demand time and maximum driving power of the battery;

and when the exit condition is met, requesting the vehicle-mounted heater to exit the heating mode, requesting the battery management system to disconnect the high-voltage relay, and requesting the vehicle-mounted charger to enter a standby mode.

6. The method of claim 5, wherein the exit condition comprises at least one of:

the charging remaining time is longer than the heating demand time;

the maximum driving power of the battery is higher than the second power value;

the battery temperature is higher than the second temperature value.

7. The method of claim 6, wherein the first temperature value is 0 ℃; the second temperature value is 15 ℃; the first power value is 30kW; the second power value is 50kW.

8. A power battery thermal insulation control device, comprising:

the judging module is used for judging whether the heat preservation condition is met according to the current battery temperature, the environment temperature, the charging residual time and the maximum driving power of the battery when the power battery is in a full state in the charging process of the power battery; the charging remaining time is determined based on the vehicle using time submitted by the user and the current time;

the control module is used for requesting the battery management system to disconnect the high-voltage relay after controlling the vehicle-mounted heater to stop working if the judgment result is yes, controlling the vehicle-mounted charger to enter a charging mode and controlling the charging pile to keep zero output; the battery management system controls the on-off of a loop between the power battery and the vehicle-mounted heater and the on-off of a loop between the power battery and the vehicle-mounted charger through the high-voltage relay;

and the control module is also used for controlling the vehicle-mounted heater to enter a heating mode when the state of the high-voltage relay fed back by the battery management system is disconnected, and controlling the charging current value output by the charging pile according to the working gear of the vehicle-mounted heater.

9. A computer readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, implements the method according to any of claims 1 to 7.

10. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 7 when the computer program is executed by the processor.