CN113173105A - Energy control method and device of electric vehicle and electric vehicle - Google Patents

Energy control method and device of electric vehicle and electric vehicle Download PDF

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Publication number
CN113173105A
CN113173105A CN202110542125.7A CN202110542125A CN113173105A CN 113173105 A CN113173105 A CN 113173105A CN 202110542125 A CN202110542125 A CN 202110542125A CN 113173105 A CN113173105 A CN 113173105A
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power
vehicle
battery
mounted charger
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吴康
张凯
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Evergrande New Energy Automobile Investment Holding Group Co Ltd
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Evergrande New Energy Automobile Investment Holding Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
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  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The application discloses an electric vehicle and an energy control method and device thereof, which are used for solving the problems that the battery electric energy cannot be fully utilized and the capacity of electric equipment cannot be exerted in the existing energy control process and the effective and efficient distribution of the available electric energy cannot be realized. The method comprises the following steps: the method comprises the steps that required power of electric equipment of an electric vehicle, the maximum output power of a vehicle-mounted charger and working parameters of a power battery are obtained, the working parameters comprise charging capacity information and discharging capacity information of the power battery, and the electric equipment comprises a low-voltage electric appliance and a heater of the power battery; controlling the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger; and respectively controlling the working power of the power battery and the working power of the electric equipment based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric equipment.

Description

Energy control method and device of electric vehicle and electric vehicle
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to an energy control method and apparatus for an electric vehicle, and an electric vehicle.
Background
The electric vehicle uses the electric energy of the battery to replace the traditional vehicle to burn petroleum for driving, and has the advantages of environmental friendliness, no pollution, strong acceleration, no noise and the like. However, the charging and discharging capacity of the battery is strongly correlated with the temperature of the battery, which varies with the amount of electricity and the temperature, and compared to the conventional fuel vehicle, the electric vehicle has many electric devices, and during the charging process, especially at low temperature and low amount of electricity, the capacity of the battery is extremely limited, and if the battery or the electric energy from the charging post cannot be reasonably distributed, the battery is overcharged or overdischarged, thereby affecting the service life of the battery. Therefore, it is necessary to distribute the electric energy from the batteries or the charging piles properly for the electric devices.
At present, for energy management of electric vehicles, one way is to limit the power of electric equipment in advance or allocate the battery energy after reserving the battery energy to a certain extent when the battery capacity or temperature is low and the capacity is limited; another way is to determine whether the battery is allowed to charge based on the battery temperature, and then determine the energy source based on the temperature threshold and distribute the energy to the battery or the battery heater. However, the above two methods cannot fully utilize the electric energy of the battery and the capability of the electric equipment, and cannot effectively and efficiently distribute the available electric energy, so that the electric vehicle cannot achieve the optimal driving or charging performance.
Disclosure of Invention
The embodiment of the application provides an energy control method and device of an electric vehicle and the electric vehicle, which are used for optimizing an energy control process of the electric vehicle and solving the problems that the battery electric energy cannot be fully utilized, the capacity of electric equipment cannot be exerted and effective and efficient distribution of available electric energy cannot be achieved in the existing energy control process.
In order to solve the technical problem, the embodiment of the application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides an energy control method for an electric vehicle, including:
the method comprises the steps that required power of electric equipment of an electric vehicle, the maximum output power of a vehicle-mounted charger and working parameters of a power battery are obtained, the working parameters comprise charging capacity information and discharging capacity information of the power battery, and the electric equipment comprises a low-voltage electric appliance and a heater of the power battery;
controlling the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger;
and respectively controlling the working power of the power battery and the working power of the electric equipment based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric equipment.
In a second aspect, an embodiment of the present application provides an energy control apparatus for an electric vehicle, including:
the system comprises an acquisition module, a power supply module and a control module, wherein the acquisition module is used for acquiring the required power of electric equipment of an electric vehicle, the maximum output power of a vehicle-mounted charger and working parameters of a power battery, the working parameters comprise charging capacity information and discharging capacity information of the power battery, and the electric equipment comprises a low-voltage electric appliance and a heater of the power battery;
the first control module is used for controlling the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger;
and the second control module is used for respectively controlling the working power of the power battery and the working power of the electric equipment based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric equipment.
In a third aspect, an embodiment of the present application provides an electric vehicle, including: the system comprises a power battery, electric equipment, a vehicle-mounted charger and a high-voltage power distribution unit;
a memory for storing the high voltage power distribution unit executable instructions;
wherein the high voltage power distribution unit is configured to execute the instructions to implement the method of the first aspect.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
because the relation between the power consumption demand and the power supply capacity of the electric vehicle can be reflected by the working parameters such as the required power of the electric vehicle, the maximum output power of the vehicle-mounted charger, the charge and discharge capacity of the power battery and the like, the output power of the vehicle-mounted charger is controlled based on the relation, and then the working power of the power battery and the required power of the electric vehicle are controlled respectively based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric vehicle.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram of an implementation environment in which an energy control method for an electric vehicle according to an embodiment of the present application is applied;
FIG. 2 is a schematic flow chart diagram illustrating a method for controlling energy of an electric vehicle according to an exemplary embodiment of the present application;
FIG. 3 is a schematic flow chart diagram illustrating a method for controlling energy of an electric vehicle according to another exemplary embodiment of the present application;
FIG. 4 is a schematic flow chart diagram illustrating a method for controlling energy of an electric vehicle according to yet another exemplary embodiment of the present application;
fig. 5 is a schematic structural diagram of an energy control device of an electric vehicle according to an exemplary embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
As mentioned above, for energy management of electric vehicles, one way is to limit the power of the electric devices in advance or allocate the energy of the battery after reserving the energy when the capacity of the battery is limited due to low battery level or temperature; another way is to determine whether the battery is allowed to charge based on the battery temperature, and then determine the energy source based on the temperature threshold and distribute the energy to the battery or the battery heater. However, the above two methods cannot fully utilize the electric energy of the battery and the capability of the electric equipment, and cannot effectively and efficiently distribute the available electric energy, so that the vehicle cannot achieve the optimal driving or charging performance.
Therefore, the embodiment of the application aims to provide an energy control scheme of an electric vehicle, based on the relation between the power consumption demand and the electric energy supply capacity, the output power of a vehicle-mounted charger, the working power of a power battery and the working power of electric equipment are respectively controlled, the electric energy of the power battery and the electric energy of the vehicle-mounted charger can be fully utilized, the power consumption demand of the electric equipment can be met, the capacity of the electric equipment is fully exerted, and the effective and efficient distribution of the available electric energy is achieved.
It should be understood that the energy control method of the electric vehicle provided by the embodiment of the present application may be executed by a control component provided in the electric vehicle, and specifically may be executed by a Power Distribution Unit (PDU) of the electric vehicle, for example.
For convenience of understanding, the following briefly describes an implementation environment to which the energy control method for an electric vehicle according to the embodiment of the present application is applied. Referring to fig. 1, an implementation environment related to the embodiment of the present application includes an On-board Charger (OBC), an electric device, a power battery, a direct current converter (DC/DC), and a high voltage power distribution unit. The electric equipment can comprise low-voltage electric appliances of the electric vehicle and a heater of a power battery. The low-voltage electrical appliance refers to a device which needs to work when the electric vehicle is charged, and the device specifically includes, but is not limited to, a control unit, a sensor, an actuator and the like. The power battery refers to a power source for providing a power source for the electric vehicle. The heater of the power battery is used for heating the power battery, and the heater heats the power battery through the heating cooling liquid.
The high-voltage power distribution unit is respectively connected with the vehicle-mounted charger, the power battery, the heater and the direct-current converter, and the low-voltage electric appliance is connected with the direct-current converter. The input end of the vehicle-mounted charger can be connected to external charging equipment (such as a charging gun of a charging pile), and electric energy provided by the external charging equipment is converted, filtered and the like and then output to the high-voltage power distribution unit.
When the power battery does not have the charging capacity, the high-voltage power distribution unit can control the electric energy output by the power battery and/or the vehicle-mounted charger according to the discharging capacity of the power battery and the power supply capacity of the vehicle-mounted charger, the received electric energy is distributed to the heater and the direct-current converter, the heater heats the power battery according to the received electric energy so as to enable the power battery to rapidly enter the charging state and improve the charging capacity of the power battery, and the direct-current converter converts the received high-voltage electricity into low-voltage electricity and outputs the low-voltage electricity to the low-voltage electric appliance so as to ensure the normal work of the low-voltage electric appliance.
When the power battery has the charging capacity, the high-voltage power distribution unit can control the electric energy output by the vehicle-mounted charger, and on one hand, the electric energy output by the vehicle-mounted charger is distributed to the power battery so as to charge the power battery; on the other hand, the electric energy output by the vehicle-mounted charger is distributed to the heater and the direct current converter, the heater heats the power battery according to the received electric energy so as to enable the power battery to rapidly enter a charging state and improve the charging capacity of the power battery, and the direct current converter converts the received high-voltage electricity into low-voltage electricity and outputs the low-voltage electricity to the low-voltage electric appliance so as to ensure the normal work of the low-voltage electric appliance. It should be noted that in practical applications, the dc converter may be provided separately from the high voltage distribution unit, or may be integrated in the high voltage distribution unit. The vehicle-mounted charger can be arranged independently of the high-voltage power distribution unit or can be integrated in the high-voltage power distribution unit. Fig. 1 illustrates only that the dc converter and the onboard charger are both arranged independently of the high-voltage distribution unit.
Based on the above implementation environment, the following describes in detail the technical solutions provided by the embodiments of the present application with reference to the drawings.
Referring to fig. 2, a flow chart of a method for controlling energy of an electric vehicle according to an exemplary embodiment of the present application is shown, the method includes the following steps:
s202, acquiring the required power of electric equipment of the electric vehicle, the maximum output power of a vehicle-mounted charger and the working parameters of the power battery.
The working parameters of the power battery comprise charging capacity information and discharging capacity information of the power battery. The charging capacity information of the power battery is used for indicating whether the power battery has the charging capacity and the maximum charging power of the power battery, and the discharging capacity information of the power battery is used for indicating whether the power battery has the discharging capacity and the maximum discharging power of the power battery.
Specifically, the maximum charging power of the power battery may be determined according to the current voltage and charging current limit of the power battery, i.e., as shown in the following equation (1). The maximum discharge power of the power battery can be determined according to the current voltage and discharge current limit value of the power battery, namely, as shown in the following formula (2).
Pchrg＝Ubatt·IchrgLim (1)
Pdischrg＝Ubatt·IdischrgLim (2)
Wherein, PchrgRepresenting the maximum charging power of the power battery; u shapebattRepresenting the electromotive voltage of the power battery; i ischrgLimRepresenting a charging current limit value of the power battery; pdischrgIndicating power electricityThe maximum discharge power of the cell; i isdischrgLimRepresenting the discharge current limit of the power cell.
If the maximum charging power of the power battery is smaller than a preset charging threshold (such as 2 kilowatts), determining that the power battery does not have the charging capacity; and if the maximum discharge power of the power battery is less than a preset discharge threshold (such as 2 kilowatts), determining that the power battery does not have the discharge capacity.
The demanded power of the powered device can characterize the power demand of the powered device. In order to ensure that the low-voltage electrical equipment in the electrical equipment can normally work in the charging process of the electric vehicle, the required power of the low-voltage electrical equipment can be obtained through the actual output voltage, the actual output current and the efficiency of the direct-current converter, namely, as shown in the following formula (3).
PDCDC＝Uout·Iout·η (3)
Wherein, PDCDCRepresenting the required power of the low-voltage electric appliance; u shapeoutRepresenting the actual output voltage of the dc converter; i isoutRepresenting the actual output current of the dc converter; η represents the efficiency of the dc converter.
The required power of the heater in the consumer means the electric power required for heating the power cell. Considering that the charging and discharging capacity of the power battery is limited due to a low temperature, in order to ensure the charging and discharging capacity of the power battery, the required power of the heater may be determined according to the target water temperature and the actual water temperature of the water inlet of the power battery, which is specifically shown in the following formula (4). The target water temperature of the water inlet can be preset according to the target temperature required to be heated by the power battery, and the actual water temperature of the water inlet can be measured through the temperature acquisition device.
Figure BDA0003071977210000071
Wherein, PHVHIndicating a required power of the heater; pmaxRepresents the maximum allowable power of the heater; t isactRepresenting the actual water temperature at the water inlet of the power battery; t istarRepresenting a target water temperature of a water inlet of the power battery;
Figure BDA0003071977210000072
represents a preset mapping relationship between the actual water temperature, the target water temperature, and the power.
The maximum output power of the vehicle-mounted charger can represent the power supply capacity of the connected external power supply equipment. In order to fully utilize the capacity of the external charging equipment and avoid damage to the vehicle-mounted charger, the maximum charging power of the vehicle-mounted charger can be determined according to the capacity of the connected external charging equipment and the power supply capacity of the vehicle-mounted charger, and specifically, the minimum value among the capacity of the connected charging pile, the cable transmission capacity of a charging gun on the charging pile and the power supply capacity of the vehicle-mounted charger can be determined as the maximum output power of the vehicle-mounted charger.
In the embodiment of the application, the energy control mode of the electric vehicle can be preset, and a driver can manually trigger the energy control mode of the electric vehicle so as to automatically control energy. Alternatively, the control component of the electric vehicle may detect whether the electric vehicle is connected to an external charging device (e.g., a charging gun), and if so, automatically trigger the energy control mode, thereby entering energy automatic control.
And S204, controlling the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger.
When the power battery has the charging capacity, the external charging equipment provides electric energy required by charging for the power battery and electric energy required by working for the electric equipment through the vehicle-mounted charger, and when the power battery has the discharging capacity, the power battery and/or the external charging equipment can provide electric energy required by working for the electric equipment, namely, the electric demand of the electric vehicle is different along with the different working parameters of the power battery. In addition, the maximum output power of the vehicle-mounted charger can reflect the power supply capacity of the external charging equipment. Therefore, the power consumption requirement of the electric vehicle can be determined based on the working parameters of the power battery and the required power of the electric equipment, and then the output power of the vehicle-mounted charger is controlled based on the power consumption requirement of the electric vehicle and the maximum output power of the vehicle-mounted charger, so that the effect of fully utilizing the power supply capacity of the connected external charging equipment can be achieved.
In an alternative embodiment, as shown in fig. 3, the S204 may include:
and S241, determining the required power of the whole electric vehicle based on the required power of the electric equipment and the working parameters of the power battery.
Specifically, if the power battery does not have the charging capability, the vehicle-mounted charger does not need to charge the power battery, and the required power of the electric equipment can be determined as the total vehicle required power of the electric vehicle, namely PDCDC+PHVHWherein P isDCDCIndicating the power demand of the low-voltage consumer, PHVHIndicating the required power of the heater.
If the power battery has the charging capacity, in order to meet the charging requirement of the power battery and the power consumption requirement of the electric equipment, the sum of the required power of the electric equipment and the maximum charging power of the power battery is determined as the total vehicle required power of the electric vehicle, namely PDCDC+PHVH+PchrgWherein P ischrgRepresenting the maximum charging power of the power battery.
It can be understood that the whole vehicle demand power of the electric vehicle is determined based on the charging capacity information of the power battery and the demand power of the electric equipment, the charging demand of the power battery and the power demand of the electric equipment are fully considered, and then the obtained whole vehicle demand power can more accurately reflect the power demand of the electric vehicle, so that the output power of the vehicle-mounted charger is controlled based on the follow-up situation, the electric energy utilization rate of the external charging equipment can be further improved, and the power demand of the electric vehicle can be better met.
And S242, determining the target output power of the vehicle-mounted charger based on the vehicle demand power of the electric vehicle and the maximum output power of the vehicle-mounted charger.
Particularly, if the whole vehicle isThe required power is less than or equal to the maximum output power of the vehicle-mounted charger, the electric energy output by the vehicle-mounted charger can meet the power consumption requirement of the electric vehicle, and the required power of the whole vehicle can be determined as the target output power of the vehicle-mounted charger, so that the electric energy output by the vehicle-mounted charger just meets the power consumption requirement of the electric vehicle. More specifically, POBC'＝PDCDC+PHVH(Power cells do not have charging capability) or POBC'＝PDCDC+PHVH+Pchrg(the power battery has charging capability), wherein, POBC' denotes the target output power of the on-board charger.
If the required power of the whole vehicle is greater than the maximum output power of the vehicle-mounted charger, the electric energy output by the vehicle-mounted charger cannot meet the power consumption requirement of the electric vehicle, and the maximum output power of the vehicle-mounted charger can be determined as the target output power of the vehicle-mounted charger, namely POBC'＝POBCWherein P isOBCAnd represents the maximum output power of the vehicle-mounted charger.
It can be understood that the target output power of the vehicle-mounted charger is determined according to the magnitude relation between the required power of the whole vehicle and the maximum output power of the vehicle-mounted charger, so that the electric energy utilization rate of the external charging equipment can be further improved.
And S243, adjusting the output power of the vehicle-mounted charger to the target output power.
Specifically, the required power of the electric equipment and the working parameters of the power battery are dynamically changed along with the change of environmental factors and the change of the power battery and the factors of the electric equipment, and the determined target output power is also dynamically changed, so that the target output power of the vehicle-mounted charger can be determined according to the preset time interval in the above manner, and the output power of the vehicle-mounted charger can be adjusted based on the target output power.
Of course, in the energy control method provided in the embodiment of the present application, other common manners in the art may also be used to adjust the output power of the vehicle-mounted charger, which is not specifically limited in the embodiment of the present application.
And S206, respectively controlling the working power of the power battery and the working power of the electric equipment based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric equipment.
Because the power demand of the electric vehicle changes along with the difference of the charging and discharging capacities of the power battery, in order to better meet the power demand of the electric vehicle, the working power of the power battery and the electric equipment can be adjusted according to the charging and discharging capacities of the power battery, the required power of the whole vehicle and the target output power of the vehicle-mounted charger.
Specifically, in an alternative embodiment, as shown in fig. 3, if the power battery does not have the charging capability, the step S206 includes:
s261a, determining the smaller value of the first required power and the maximum discharge power of the power battery as a first working power threshold, and controlling the power battery to discharge with power not exceeding the first working power threshold, wherein the first required power is the difference between the required power of the whole vehicle and the target output power of the vehicle-mounted charger.
More specifically, when the power battery does not have the charging capability, the required power of the entire vehicle is the required power of the electric equipment (i.e., the sum of the required power of the low-voltage electric equipment and the required power of the heater), and if the required power of the entire vehicle is less than or equal to the target output power of the vehicle-mounted charger, the electric energy output by the vehicle-mounted charger is enough to meet the power demand of the electric vehicle, so that the first working power threshold is 0, that is, the power battery is not required to discharge.
If the required power of the whole vehicle is greater than the target output power of the vehicle-mounted charger, the electric energy output by the vehicle-mounted charger cannot meet the power consumption requirement of the electric vehicle, and the power battery is required to discharge. If the power battery has discharge capability at this time, the first working power threshold value can be determined to be min { P }DCDC+PHVH-POBC',PdischrgIn which P isDCDCIndicating the power demand of the low-voltage consumer, PHVHIndicating the power demand of the heater, POBC' indicates the target output Power, P, of the on-board chargerdischrgDisplay movementMaximum discharge power of the force cell. If the power battery does not have the discharging capacity at the moment, the vehicle-mounted charger still supplies power.
And S262a, determining the difference value between the first sum value and the target working power of the low-voltage electric appliance as the maximum available output power of the heater, wherein the first sum value is the sum of the maximum discharge power of the power battery and the target output power of the vehicle-mounted charger.
That is, the maximum available output power of the heater is Pdischrg+POBC'-PDCDC。
S263a, determining the smaller of the maximum available output power of the heater and the required power of the heater as the target operating power of the heater.
That is, the target operating power of the heater is min { P }HVH,Pdischrg+POBC'-PDCDC}. More specifically, if POBC'＝PDCDC+PHVHThen the target operating power of the heater is PHVH(ii) a If P isOBC'＝POBCThen the target operating power of the heater is POBC-PDCDC(when the power battery does not have discharge capability) or min { P {HVH,Pdischrg+POBC'-PDCDCWhen the power battery has discharge capability.
And S264a, controlling the low-voltage electric appliance and the heater to respectively work at the target working power of the low-voltage electric appliance and the heater.
It can be understood that when the power battery does not have the charging capacity, the first required power is determined according to the finished automobile required power and the target output power of the vehicle-mounted charger, and the discharge power of the power battery is controlled according to the smaller value of the first required power and the maximum discharge power of the power battery, so that the problem of over-discharge of the power battery is avoided while the finished automobile power demand of the electric vehicle is met, and the safety of the power battery is improved. In addition, when the working power of the electric equipment is controlled, the low-voltage electric equipment can be ensured to work normally through the mode, and the heater is prevented from being damaged due to the fact that the electric energy provided by the heater is too large.
After the temperature of the power battery rises gradually to enable the power battery to have charging capacity, not only power supply needs to be carried out on the electric equipment, but also the power battery needs to be charged. At this time, in order to enable the power battery to enter the charging state as soon as possible and improve the charging efficiency, the heating requirement and the charging requirement of the power battery can be determined by combining the temperature of the power battery, and the working power of the power battery and the working power of the electric equipment are further controlled based on the determined heating requirement and the determined charging requirement. Specifically, as shown in fig. 3, the operating parameters of the power battery further include the temperature of the power battery, and if the power battery has a charging capability, the step S206 includes:
and S261b, monitoring whether the target output power of the vehicle-mounted charger is larger than or equal to the required power of the whole vehicle.
If so, the target output power of the vehicle-mounted charger is sufficient to meet the power demand of the low-voltage electric appliances and the heater and the charging demand of the power battery, and the following steps S262b to S265b can be executed.
And S262b, determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance.
S263b, determining the required power of the heater as the target operating power of the heater.
And S264b, controlling the low-voltage electric appliance and the heater to respectively work at the target working power of the low-voltage electric appliance and the heater.
S265b, controlling the power battery to be charged with the first target operating power, using the maximum charging power of the power battery as the first target operating power of the power battery.
Further, if the target output power of the vehicle-mounted charger is smaller than the normal required power, the target output power of the vehicle-mounted charger cannot simultaneously meet the power consumption requirements of the low-voltage electric appliance and the heater and the charging requirement of the power battery, in order to enable the power battery to enter a charging state as soon as possible and improve charging efficiency, the obtained working parameters of the power battery can further include the temperature of the power battery, and then the energy distributed to the heater and the power battery is determined by combining the temperature of the power battery. Specifically, the following steps S266b to S269b may be performed.
And S266b, determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance.
And S267b, determining the target working power of the heater based on the target output power of the vehicle-mounted charger, the target working power of the low-voltage electric appliance, the required power of the heater and the temperature of the power battery.
More specifically, if the temperature of the power battery does not preset the operating temperature, in order to enable the power battery to enter the charging state as soon as possible and improve the charging efficiency, the target distribution coefficient may be determined based on a difference between the temperature of the power battery and the preset operating temperature and a preset correspondence between the temperature difference and the distribution coefficient. Then, based on the difference value between the target output power of the vehicle-mounted charger and the target working power of the low-voltage electrical appliance and the target distribution coefficient, determining a first preset distribution power corresponding to the heater, namely m (P)OBC'-PDCDC). Finally, the smaller value of the first preset distribution power and the required power of the heater is determined as the target working power of the heater, namely min { P }HVH,m·(POBC'-PDCDC)}。
It should be noted that the preset operating temperature may be a comfortable operating temperature preset according to actual needs. In addition, the corresponding relation between the temperature difference and the distribution coefficient can be preset according to the test results of multiple times in the actual engineering development process. For example, table 1 shows an example of a preset correspondence between a temperature difference and a distribution coefficient.
TABLE 1
Temperature difference 0 5 10 15 20 30 50
Distribution coefficient m 0.1 0.2 0.3 0.4 0.5 0.8 1
In order to adapt to the charging requirement and the heating requirement of the power battery under different environments, the temperature of the power battery is prevented from being reduced to influence the charging efficiency after the heater stops working, and if the temperature of the power battery reaches the preset working temperature, the ambient temperature of the environment where the electric vehicle is located is obtained. Then, determining the heat preservation required power of the power battery based on the acquired environment temperature and the preset corresponding relation between the environment temperature and the heat preservation required power; further, determining the difference value between the target output power of the vehicle-mounted charger and the target working power of the low-voltage electric appliance as a second pre-distribution power corresponding to the heater, namely POBC'-PDCDC. And finally, determining the smaller value of the second pre-distributed power and the heat preservation required power of the power battery as the target working power of the heater, namely min { P }Heat preservation,POBC'-PDCDCIn which P isHeat preservationAnd the temperature required for heat preservation of the power battery is shown.
It should be noted that the corresponding relationship between the ambient temperature and the required thermal insulation power may be preset according to the results of multiple tests in the actual engineering development process.
And S268b, controlling the low-voltage electric appliance and the heater to respectively work at the target working power of the low-voltage electric appliance and the heater.
S269b, determining a difference value between the target output power of the vehicle-mounted charger and the total power demand of the electric equipment as a second target working power corresponding to the power battery, and controlling the power battery to charge with the second target working power, wherein the total power demand is the sum of the power demand of the low-voltage electric equipment and the power demand of the heater.
That is to say, when the power battery has the charging capability, the electric energy output by the vehicle-mounted charger is preferentially provided for the electric equipment to ensure that the electric equipment can work normally, and then the residual electric energy is used for charging the power battery.
It can be understood that when the power battery has the charging capability, the required power of the low-voltage electric appliance is determined as the target working power of the low-voltage electric appliance, so that the normal work of the low-voltage electric appliance can be preferentially ensured; then, the target working power of the heater is determined based on the target output power of the vehicle-mounted charger, the target working power of the low-voltage electrical appliance, the required power of the heater and the temperature of the power battery, so that the power battery can enter a charging state as soon as possible and the charging efficiency is improved; finally, the power battery is controlled to be charged based on the difference value between the target output power of the vehicle-mounted charger and the total power required by the electric equipment, the residual energy output by the vehicle-mounted charger can be fully utilized to charge the power battery, the heat preservation requirement of the power battery can be met, and the utilization rate of the electric energy output by the vehicle-mounted charger can be further improved.
Of course, in the energy control method provided in the embodiment of the present application, other common manners in the art may also be used to control the operating power of the power battery and the electric device, which is not specifically limited in the embodiment of the present application.
According to the energy control method of the electric vehicle, the relation between the power consumption demand and the power supply capacity of the electric vehicle can be reflected by the demand power of the electric equipment, the maximum output power of the vehicle-mounted charger and the charging capacity information of the power battery, the output power of the vehicle-mounted charger is controlled based on the relation, and the working powers of the power battery and the electric equipment are respectively controlled based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the demand power of the electric equipment.
Referring to fig. 4, a flowchart of an energy control method for an electric vehicle according to another exemplary embodiment of the present application is shown. As shown in fig. 4, the method includes:
and S41, detecting whether the vehicle-mounted charger is connected to the external charging equipment.
If so, S42 is performed.
And S42, acquiring the required power of the electric equipment of the electric vehicle, the maximum output power of the vehicle-mounted charger and the working parameters of the power battery.
The working parameters of the power battery comprise charging capacity information and discharging capacity information of the power battery. Specifically, the charging capability information of the power battery may include a maximum charging power P of the power batterydischrgThe discharge capability information of the power battery may include a maximum discharge power P of the power batterychrg. The electric equipment comprises a low-voltage electric appliance and a heater of a power battery.
And S43, judging whether the power battery has the charging capability.
If not, go to S44 a; if so, S44b is performed.
S44a, judging the demand power P of the low-voltage electric applianceDCDCRequired power P of heaterHVHWhether the sum is less than or equal to the maximum output power P of the vehicle-mounted chargerOBC。
If so, go to S45 a; if not, S48a is executed.
S45a, adjusting the output power of the vehicle-mounted charger to be the sum P of the required power of the low-voltage electric appliance and the required power of the heaterDCDC+PHVH。
S46a, controlling the low-voltage electric appliance to have the required power PDCDCAnd (5) working.
S47a, controlling the heater to self demand power PHVHAnd (5) working.
And S48a, judging that the power battery has the discharge capability.
If not, go to S49 a; if so, S52a is performed.
S49a, adjusting the output power of the vehicle-mounted charger to the maximum output power P of the vehicle-mounted chargerOBC。
S50a, adjusting the working power of the low-voltage electric appliance to the required power P of the low-voltage electric applianceDCDC。
S51a, adjusting the working power of the control heater to be the difference value between the output power of the vehicle-mounted charger and the required power of the low-voltage electric appliance for working POBC-PDCDC。
S52a, adjusting the output power of the vehicle-mounted charger to the maximum output power P of the vehicle-mounted chargerOBC。
S53a, adjusting the working power of the power battery to be not more than the first working power threshold min { P }DCDC+PHVH-POBC，PdischrgDischarge is performed.
S54a, adjusting the working power of the low-voltage electric appliance to the required power P of the low-voltage electric applianceDCDC。
S55a, adjusting the working power of the heater to be the smaller value min { P } of the maximum available output power of the heater and the required power of the heaterHVH,Pdischrg+POBC-PDCDC}。
And S44b, judging whether the cell temperature of the power battery reaches the preset working temperature.
If not, go to S45 b; if so, S54b is performed.
S45b, judging the sum P of the required power of the low-voltage electric appliance, the required power of the heater and the maximum charging power of the power batteryDCDC+PHVH+PchrgWhether the maximum output power P of the vehicle-mounted charger is less than or equal toOBC。
If so, go to S46 b; if not, S50b is performed.
S46b, adjusting the output power of the vehicle-mounted charger to the sum P of the required power of the low-voltage electric appliance, the required power of the heater and the maximum charging power of the power batteryDCDC+PHVH+Pchrg。
S47b, adjusting the working power of the low-voltage electric appliance to the required power P of the low-voltage electric applianceDCDC。
S48b, adjusting the working power of the heater to the required power P of the heaterHVH。
S49b, controlling the power battery to have the maximum charging power PchrgAnd charging is carried out.
S50b, adjusting the output power of the vehicle-mounted charger to the maximum output power P of the vehicle-mounted chargerOBC。
S51b, adjusting the working power of the low-voltage electric appliance to the required power P of the low-voltage electric applianceDCDC。
S52b, adjusting the working power of the heater to min { P }HVH,m·(POBC-PDCDC)}。
S53b, controlling the power battery to work at the first target working power POBC-PDCDC-min{PHVH,m·(POBC-PDCDC) Carry on the charging.
And S54b, determining the heat preservation required power of the power battery based on the environment temperature of the environment where the electric vehicle is located and the preset corresponding relation between the environment temperature and the heat preservation required power.
S55b, adjusting the output power of the vehicle-mounted charger to the maximum output power P of the vehicle-mounted chargerOBC。
S56b, adjusting the working power of the low-voltage electric appliance to the required power P of the low-voltage electric applianceDCDC。
S57b, adjusting the working power of the heater to min { P }Heat preservation,POBC-PDCDC}。
S58b, controlling the power battery to work at the second target working power POBC-PDCDC-min{PHeat preservation,POBC-PDCDCCarry on the charging.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
In correspondence with the energy control method of the electric vehicle shown in fig. 2, the embodiment of the present application also provides an energy control device of the electric vehicle. Fig. 5 is a schematic structural diagram of an energy control apparatus of an electric vehicle according to an exemplary embodiment of the present application, where the apparatus 500 includes:
the acquiring module 510 is configured to acquire required power of electric equipment of an electric vehicle, maximum output power of a vehicle-mounted charger, and working parameters of a power battery, where the working parameters include charging capability information and discharging capability information of the power battery, and the electric equipment includes a low-voltage electric appliance and a heater of the power battery;
the first control module 520 is configured to control the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric device, and the maximum output power of the vehicle-mounted charger;
the second control module 530 is configured to control the working powers of the power battery and the electrical equipment respectively based on the output power of the vehicle-mounted charger, the working parameter of the power battery, and the required power of the electrical equipment.
Optionally, the first control module 520 includes:
the whole vehicle required power determining submodule is used for determining the whole vehicle required power of the electric vehicle based on the required power of the electric equipment and the working parameters of the power battery;
the target output power determining submodule is used for determining the target output power of the vehicle-mounted charger based on the finished vehicle required power and the maximum output power of the vehicle-mounted charger;
and the output power adjusting submodule is used for adjusting the output power of the vehicle-mounted charger to the target output power.
Optionally, the charging capability information is used for indicating whether the power battery has a charging capability and a maximum charging power, and the discharging capability information is used for indicating whether the power battery has a discharging capability and a maximum discharging power;
the finished automobile required power determining submodule is specifically used for:
if the power battery does not have the charging capacity, determining the required power of the electric equipment as the whole vehicle required power of the electric vehicle;
and if the power battery has the charging capacity, determining the sum of the required power of the electric equipment and the maximum charging power of the power battery as the total vehicle required power of the electric vehicle.
Optionally, the target output power determining submodule is specifically configured to:
if the required power of the whole vehicle is smaller than or equal to the maximum output power of the vehicle-mounted charger, determining the required power of the whole vehicle as the target output power of the vehicle-mounted charger;
and if the required power of the whole vehicle is greater than the maximum output power of the vehicle-mounted charger, determining the maximum output power of the vehicle-mounted charger as the target output power of the vehicle-mounted charger.
Alternatively, if the power battery does not have a charging capability, the second control module 530 comprises:
the first control submodule is used for determining the smaller value of a first required power and the maximum discharge power of the power battery as a first working power threshold value and controlling the power battery to discharge with power not exceeding the first working power threshold value, wherein the first required power is the difference value between the required power of the whole vehicle and the target output power of the vehicle-mounted charger;
the first low-voltage working power determining submodule is used for determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance;
the maximum available output power determining submodule is used for determining a difference value between a first sum and the target working power of the low-voltage electric appliance as the maximum available output power of the heater, and the first sum is the sum of the maximum discharge power of the power battery and the target output power of the vehicle-mounted charger;
a first heating working power determination submodule for determining the smaller value of the maximum available output power of the heater and the required power of the heater as the target working power of the heater;
and the second control submodule is used for controlling the low-voltage electric appliance and the heater to work at the target working power of the low-voltage electric appliance and the target working power of the heater.
Alternatively, if the power battery has a charging capability, the second control module 530 comprises:
the power monitoring submodule is used for monitoring whether the target output power of the vehicle-mounted charger is greater than or equal to the required power of the whole vehicle;
the second low-voltage working power determining submodule is used for determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance when the target output power of the vehicle-mounted charger is greater than or equal to the required power of the whole vehicle;
the second heating working power determining submodule is used for determining the required power of the heater as the target working power of the heater;
the third control sub-module is used for controlling the low-voltage electric appliance and the heater to work at the target working power of the low-voltage electric appliance and the target working power of the heater respectively;
and the fourth control submodule is used for taking the maximum charging power of the power battery as the first target working power of the power battery and controlling the power battery to be charged at the first target working power.
Optionally, the second control module 530 further includes:
the third low-voltage working power determining submodule is used for determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance when the target output power of the vehicle-mounted charger is smaller than the required power of the whole vehicle;
a third heating working power determination submodule, configured to determine a target working power of the heater based on a target output power of the vehicle-mounted charger, a target working power of the low-voltage electrical appliance, a required power of the heater, and a temperature of the power battery, where a working parameter of the power battery further includes the temperature of the power battery;
the fifth control submodule is used for controlling the low-voltage electric appliance and the heater to work at the target working power of the low-voltage electric appliance and the target working power of the heater;
and the second current control submodule is used for determining a difference value between the target output power of the vehicle-mounted charger and the total power demand of the electric equipment as a second target working power corresponding to the power battery, and controlling the power battery to be charged at the second target working power.
Optionally, the third heating operation power determining submodule is specifically configured to:
if the temperature of the power battery does not reach the preset working temperature, determining a target distribution coefficient based on a difference value between the temperature of the power battery and the preset working temperature and a preset corresponding relation between the temperature difference and the distribution coefficient;
determining a first pre-distribution power corresponding to the heater based on a difference value between the target output power of the vehicle-mounted charger and the target working power of the low-voltage electrical appliance and the target distribution coefficient;
and determining the smaller value of the first pre-distribution power and the required power of the heater as the target working power of the heater.
Optionally, the third heating operation power determining submodule is specifically configured to:
if the temperature of the power battery reaches the preset working temperature, acquiring the environmental temperature of the environment where the electric vehicle is located;
determining the heat preservation required power of the power battery based on the environment temperature and the preset corresponding relation between the environment temperature and the heat preservation required power;
determining a difference value between the target output power of the vehicle-mounted charger and the target working power of the low-voltage electrical appliance as a second pre-distribution power corresponding to the heater;
and determining the smaller value of the second pre-distributed power and the heat preservation required power of the power battery as the target working power of the heater.
Obviously, the energy control device of the electric vehicle provided in the embodiment of the present application may be an execution subject of the energy control method of the electric vehicle shown in fig. 2 to 4, and thus the functions of the energy control method of the electric vehicle realized in fig. 2 to 4 can be realized. Since the principle is the same, it is not described herein again.
In addition, this application embodiment still provides an electric vehicle, and this electric vehicle includes power battery, consumer, on-vehicle machine that charges, high voltage distribution unit and memory. The memory is used for storing high voltage power distribution unit executable instructions, wherein the high voltage power distribution unit is configured to execute the instructions to realize the energy control method of the electric vehicle provided by the embodiment of the application.
In particular, the electrical consumers may include low voltage electrical consumers and heaters for power batteries. The electric vehicle further includes a dc converter. The high-voltage power distribution unit is respectively connected with the vehicle-mounted charger, the power battery, the heater and the direct-current converter, and the low-voltage electric appliance is connected with the direct-current converter.
It can be understood that, with the electric vehicle provided by the embodiment of the present application, because the required power of the electric equipment, the maximum output power of the vehicle-mounted charger, and the charging capability information and the discharging capability information of the power battery can reflect the relationship between the power consumption requirement and the power supply capability of the electric vehicle, the output power of the vehicle-mounted charger is controlled based on the relationship, and then the output power of the vehicle-mounted charger, the working parameters of the power battery, and the required power of the electric equipment are respectively controlled based on the output power of the vehicle-mounted charger, the electric energy of the power battery and the electric equipment can be fully utilized, the power consumption requirement of the electric equipment can be met, the capability of the electric equipment can be fully exerted, and the effective and efficient distribution of the available electric energy can be achieved, therefore, the electric vehicle can achieve the best driving performance and charging performance, and the electric vehicle can achieve the best driving performance and charging performance.
Embodiments of the present application also provide a computer-readable storage medium storing one or more programs, where the one or more programs include instructions, which when executed by a portable electronic device including a plurality of application programs, enable the portable electronic device to perform the method of the embodiment shown in fig. 2, and are specifically configured to:
the method comprises the steps that required power of electric equipment of an electric vehicle, the maximum output power of a vehicle-mounted charger and working parameters of a power battery are obtained, the working parameters comprise charging capacity information and discharging capacity information of the power battery, and the electric equipment comprises a low-voltage electric appliance and a heater of the power battery;
controlling the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger;
and respectively controlling the working power of the power battery and the working power of the electric equipment based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric equipment.
In short, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

Claims (11)

1. An energy control method of an electric vehicle, characterized by comprising:
the method comprises the steps that required power of electric equipment of an electric vehicle, the maximum output power of a vehicle-mounted charger and working parameters of a power battery are obtained, the working parameters comprise charging capacity information and discharging capacity information of the power battery, and the electric equipment comprises a low-voltage electric appliance and a heater of the power battery;
controlling the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger;
and respectively controlling the working power of the power battery and the working power of the electric equipment based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric equipment.
2. The method according to claim 1, wherein the controlling the output power of the vehicle-mounted charger based on the operating parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger comprises:
determining the whole vehicle required power of the electric vehicle based on the required power of the electric equipment and the working parameters of the power battery;
determining the target output power of the vehicle-mounted charger based on the finished vehicle required power and the maximum output power of the vehicle-mounted charger;
and adjusting the output power of the vehicle-mounted charger to the target output power.
3. The method of claim 2, wherein the charging capability information is used for indicating whether the power battery has a charging capability and a maximum charging power, and the discharging capability information is used for indicating whether the power battery has a discharging capability and a maximum discharging power;
based on the required power of the electric equipment and the working parameters of the power battery, the whole vehicle required power of the electric vehicle is determined, and the method comprises the following steps:
if the power battery does not have the charging capacity, determining the required power of the electric equipment as the whole vehicle required power of the electric vehicle;
and if the power battery has the charging capacity, determining the sum of the required power of the electric equipment and the maximum charging power of the power battery as the total vehicle required power of the electric vehicle.
4. The method according to claim 3, wherein the determining the target output power of the vehicle-mounted charger based on the vehicle demand power and the maximum output power of the vehicle-mounted charger comprises:
if the required power of the whole vehicle is smaller than or equal to the maximum output power of the vehicle-mounted charger, determining the required power of the whole vehicle as the target output power of the vehicle-mounted charger;
and if the required power of the whole vehicle is greater than the maximum output power of the vehicle-mounted charger, determining the maximum output power of the vehicle-mounted charger as the target output power of the vehicle-mounted charger.
5. The method according to claim 3, wherein if the power battery does not have a charging capability, the controlling the operating power of the power battery and the electric equipment respectively based on the output power of the vehicle-mounted charger, the operating parameter of the power battery and the required power of the electric equipment comprises:
determining the smaller value of a first required power and the maximum discharge power of the power battery as a first working power threshold, and controlling the power battery to discharge at a power not exceeding the first working power threshold, wherein the first required power is a difference value between the required power of the whole vehicle and the target output power of the vehicle-mounted charger;
determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance;
determining a difference value between a first sum value and the target working power of the low-voltage electric appliance as the maximum available output power of the heater, wherein the first sum value is the sum of the maximum discharge power of the power battery and the target output power of the vehicle-mounted charger;
determining the smaller value of the maximum available output power of the heater and the required power of the heater as the target working power of the heater;
and controlling the low-voltage electric appliance and the heater to work at the target working power of the low-voltage electric appliance and the heater respectively.
6. The method according to claim 3, wherein if the power battery has a charging capability, the controlling the operating power of the power battery and the operating power of the electric equipment respectively based on the output power of the vehicle-mounted charger, the operating parameter of the power battery and the required power of the electric equipment comprises:
monitoring whether the target output power of the vehicle-mounted charger is greater than or equal to the required power of the whole vehicle;
if so, determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance;
determining a required power of the heater as a target operating power of the heater;
controlling the low-voltage electric appliance and the heater to work at the target working power of the low-voltage electric appliance and the target working power of the heater respectively;
and taking the maximum charging power of the power battery as a first target working power of the power battery, and controlling the power battery to be charged at the first target working power.
7. The method according to claim 6, wherein the controlling the operating power of the power battery and the electric equipment respectively based on the output power of the vehicle-mounted charger, the operating parameter of the power battery, and the required power of the electric equipment further comprises:
if the target output power of the vehicle-mounted charger is smaller than the required power of the whole vehicle, determining the required power of the low-voltage electric appliance as the target working power of the low-voltage electric appliance;
determining the target working power of the heater based on the target output power of the vehicle-mounted charger, the target working power of the low-voltage electrical appliance, the required power of the heater and the temperature of the power battery, wherein the working parameters of the power battery further comprise the temperature of the power battery;
controlling the low-voltage electric appliance and the heater to work at the target working power of the low-voltage electric appliance and the target working power of the heater respectively;
and determining a difference value between the target output power of the vehicle-mounted charger and the total power required by the electric equipment as a second target working power corresponding to the power battery, and controlling the power battery to be charged at the second target working power.
8. The method according to claim 7, wherein the determining the target operating power of the heater based on the target output power of the vehicle-mounted charger, the target operating power of the low-voltage electrical appliance, the required power of the heater, and the temperature of the power battery comprises:
if the temperature of the power battery does not reach the preset working temperature, determining a target distribution coefficient based on a difference value between the temperature of the power battery and the preset working temperature and a preset corresponding relation between the temperature difference and the distribution coefficient;
determining a first pre-distribution power corresponding to the heater based on a difference value between the target output power of the vehicle-mounted charger and the target working power of the low-voltage electrical appliance and the target distribution coefficient;
and determining the smaller value of the first pre-distribution power and the required power of the heater as the target working power of the heater.
9. The method according to claim 7, wherein the determining the target operating power of the heater based on the target output power of the vehicle-mounted charger, the target operating power of the low-voltage electrical appliance, the required power of the heater, and the temperature of the power battery comprises:
if the temperature of the power battery reaches a preset working temperature, acquiring the environmental temperature of the environment where the electric vehicle is located;
determining the heat preservation required power of the power battery based on the environment temperature and the preset corresponding relation between the environment temperature and the heat preservation required power;
determining a difference value between the target output power of the vehicle-mounted charger and the target working power of the low-voltage electrical appliance as a second pre-distribution power corresponding to the heater;
and determining the smaller value of the second pre-distributed power and the heat preservation required power of the power battery as the target working power of the heater.
10. An energy control device of an electric vehicle, characterized by comprising:
the system comprises an acquisition module, a power supply module and a control module, wherein the acquisition module is used for acquiring the required power of electric equipment of an electric vehicle, the maximum output power of a vehicle-mounted charger and working parameters of a power battery, the working parameters comprise charging capacity information and discharging capacity information of the power battery, and the electric equipment comprises a low-voltage electric appliance and a heater of the power battery;
the first control module is used for controlling the output power of the vehicle-mounted charger based on the working parameters of the power battery, the required power of the electric equipment and the maximum output power of the vehicle-mounted charger;
and the second control module is used for respectively controlling the working power of the power battery and the working power of the electric equipment based on the output power of the vehicle-mounted charger, the working parameters of the power battery and the required power of the electric equipment.
11. An electric vehicle, characterized by comprising: the system comprises a power battery, electric equipment, a vehicle-mounted charger and a high-voltage power distribution unit;
a memory for storing the high voltage power distribution unit executable instructions;
wherein the high voltage power distribution unit is configured to execute the instructions to implement the method of any of claims 1 to 9.
CN202110542125.7A 2021-05-18 2021-05-18 Energy control method and device of electric vehicle and electric vehicle Pending CN113173105A (en)

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