CN112319313A - Battery heat preservation control method and control system based on power grid - Google Patents
Battery heat preservation control method and control system based on power grid Download PDFInfo
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- CN112319313A CN112319313A CN202011134902.6A CN202011134902A CN112319313A CN 112319313 A CN112319313 A CN 112319313A CN 202011134902 A CN202011134902 A CN 202011134902A CN 112319313 A CN112319313 A CN 112319313A
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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
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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- 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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- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Secondary Cells (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a battery heat preservation control method and a battery heat preservation control system based on a power grid, and belongs to the field of vehicle control. The battery heat preservation control method comprises the following steps: after the vehicle finishes charging the charging pile and a vehicle-mounted charger of the vehicle is in an inserted state with the charging pile, judging whether the temperature of a battery pack of the vehicle is lower than a first preset value or not; when the temperature of a battery pack of the vehicle is lower than a first preset value, controlling a vehicle-mounted charger to send a charging request to a charging pile, and simultaneously controlling a power supply switch of the battery pack to be switched off, so that a thermal management system of the vehicle obtains energy of the charging pile through the vehicle-mounted charger and uses the energy to heat the battery pack; and when the temperature of a battery pack of the vehicle is higher than a second preset value, controlling the vehicle-mounted charger to send a charging stopping request to the charging pile so that the charging pile stops providing energy, wherein the second preset value is higher than the first preset value. The battery heat preservation control method and the control system can ensure the driving performance of the vehicle and reduce the reduction of the endurance mileage of the whole vehicle.
Description
Technical Field
The invention belongs to the field of vehicle control, and particularly relates to a battery heat preservation control method and a battery heat preservation control system based on a power grid.
Background
The electric automobile has many advantages, and the electric automobile is a future development trend, and the fuel oil automobile is finally replaced by the electric automobile whether from the environmental or national energy level. But the prior electric automobile is not as perfect as an internal combustion engine automobile in technology, the service life of the battery pack is short, the use cost is high, and the driving mileage after one-time charging is not ideal. Besides that the energy density of the battery pack cannot be effectively improved in a short time, the characteristic that the performance of the battery pack is influenced by the environmental temperature is also an important factor influencing the endurance of the electric vehicle. It is known that the same battery pack emits a large difference of electric quantity at different temperatures under the same electric quantity.
The existing part of vehicle models adopt a battery pack constant temperature scheme, namely, the temperature of the battery pack is judged in the life cycle of the battery pack, once the temperature of the battery pack is reduced to a certain value, the battery pack is started to be heated, the temperature of the battery pack is continuously judged, and the thermal management is started until the SOC of the battery pack is too low. The problem of the not enough driving force that brings because the energy distributes battery package thermal management excessively when the battery package low temperature driving has been solved to this scheme, it leads to the battery package cooling and then influences the duration problem also to have solved ambient temperature and hang down excessively, but its side effect is also very obvious, the battery package keeps on keeping warm itself can consume the energy of battery package, power consumptive less obvious in the short time, but if do not drive for a few days or longer time, a large amount of energy can be consumed to the battery package constant temperature, lead to battery package feed influence even to drive.
There are also schemes to maintain the temperature of the battery pack during charging: the temperature of the battery pack is maintained within a certain range in the charging process, the battery pack is stably maintained after charging is finished, the temperature of the battery pack is judged when a driver drives out, the heat management of the whole vehicle is started according to the temperature of the battery pack, and the temperature of the battery pack is increased to improve the discharging capacity of the battery pack. This solution can also alleviate the problem of reduced endurance due to too low a temperature of the battery pack, but has some disadvantages: a) by discharging through whole car battery package and giving the battery package heating, will consume battery package partial energy and can reduce partly whole car continuation of the journey equally, b) under the environment and the lower condition of battery package temperature, the discharge capacity of battery package itself is not enough, will give the battery package heating this moment, passenger storehouse air conditioner heating, the drive power that can provide will be restricted, influence driving experience.
Disclosure of Invention
An object of the present invention is to provide a novel battery thermal insulation control method capable of ensuring drivability of a vehicle and reducing a decrease in the driving range of the entire vehicle.
Another object of the present invention is to avoid the overcharge phenomenon caused by the charging of the grid electricity in the charging pile into the battery pack.
It is a further object of the present invention to reduce overall vehicle energy consumption.
Particularly, the invention provides a battery heat preservation control method based on a power grid, which comprises the following steps:
after a vehicle finishes charging of a charging pile and a vehicle-mounted charger of the vehicle is in an inserted state with the charging pile, judging whether the temperature of a battery pack of the vehicle is lower than a first preset value or not;
when the temperature of a battery pack of the vehicle is lower than a first preset value, controlling the vehicle-mounted charger to send a charging request to the charging pile, and simultaneously controlling a power supply switch of the battery pack to be switched off, so that a thermal management system of the vehicle obtains energy of the charging pile through the vehicle-mounted charger and uses the energy to heat the battery pack;
and when the temperature of a battery pack of the vehicle is higher than a second preset value, controlling the vehicle-mounted charger to send a charging stopping request to the charging pile so that the charging pile stops providing energy, wherein the second preset value is higher than the first preset value.
Optionally, after the step of maintaining the vehicle-mounted charger of the vehicle in the plug-in state with the charging pile after the vehicle finishes charging the charging pile and before determining whether the temperature of the battery pack of the vehicle is lower than a first preset value, the battery heat preservation control method further includes:
starting a heat preservation period for timing and controlling the whole vehicle to enter a dormant state;
waking up a battery management system of the vehicle every a preset period;
and detecting the temperature of the battery pack after the battery management system is awakened.
Optionally, the preset period is determined according to an ambient temperature.
Optionally, the step of controlling the vehicle-mounted charger to send a charging request to the charging pile when the temperature of the battery pack of the vehicle is lower than a first preset value includes:
when the temperature of the battery pack is lower than a first preset value, the vehicle-mounted charger and the thermal management system are awakened;
calculating total required energy consumption according to the required energy consumption of the thermal management system and the low-voltage energy consumption of the whole vehicle;
and sending the total required energy consumption to the charging pile so as to provide energy for the thermal management system and low-voltage devices on the vehicle through the charging pile and the vehicle-mounted charger.
Optionally, the total required energy consumption is not greater than the sum of the required energy consumption of the thermal management system and the overall low-voltage energy consumption of the vehicle.
Optionally, after the step of controlling the vehicle-mounted charger to send a charging stop request to the charging pile when the temperature of the battery pack of the vehicle is higher than a second preset value, the method further includes:
and judging whether the timing duration of the heat preservation period reaches a time threshold, if so, not waking up the battery management system until the next charging is completed, otherwise, waking up the battery management system of the vehicle at intervals of a preset period.
Particularly, the invention also provides a battery heat preservation control system based on the power grid, which comprises:
the vehicle-mounted charger is connected with the charging pile;
the thermal management system is connected with the vehicle-mounted charger and exchanges energy with a battery pack of a vehicle through a heat exchange medium;
the battery management system is in signal connection with the vehicle-mounted charger, the thermal management system and the battery pack, the charging device is used for charging the vehicle after the vehicle finishes charging the charging pile, and a vehicle-mounted charger of the vehicle is in a plug-in state with the charging pile, and when the temperature of the battery pack of the vehicle is lower than a first preset value, controlling the vehicle-mounted charger to send a charging request to the charging pile, meanwhile, a power supply switch of the battery pack is controlled to be switched off, so that a thermal management system of the vehicle obtains the energy of the charging pile through the vehicle-mounted charger and uses the energy to heat the battery pack, the battery management system is also used for controlling the vehicle-mounted charger to send a charging stop request to the charging pile when the temperature of the battery pack of the vehicle is higher than a second preset value, so that the charging pile stops providing energy, wherein the second preset value is higher than the first preset value.
Optionally, the battery management system is further configured to start a heat preservation period for timing after the vehicle finishes charging the charging pile and keeps a vehicle-mounted charger of the vehicle in a plug-in state with the charging pile, to self-wake up every preset period, and to detect the temperature of the battery pack after self-wake up, where the preset period is determined according to the ambient temperature.
Optionally, the battery management system is further configured to wake up the vehicle-mounted charger and the thermal management system when the temperature of the battery pack is lower than a first preset value, calculate total required energy consumption according to the required energy consumption of the thermal management system and the whole vehicle low-voltage energy consumption of the vehicle, and send the total required energy consumption to the charging pile so as to provide energy to the thermal management system and the low-voltage devices on the vehicle through the charging pile and the vehicle-mounted charger, wherein the total required energy consumption is not greater than the sum of the required energy consumption of the thermal management system and the whole vehicle low-voltage energy consumption of the vehicle.
Optionally, the battery management system is further configured to determine whether the duration of the thermal cycle timing reaches a time threshold, and self-wake up every preset cycle when the duration of the thermal cycle timing does not reach the time threshold, and no longer self-wake up until the next charging is completed when the duration of the thermal cycle timing reaches the time threshold.
The invention can utilize the power supply of the power grid to carry out heat preservation on the battery pack, and the function aims at maintaining the temperature of the battery pack under the condition of long-time placement in a severe (extremely low temperature and extremely high temperature) environment so as to ensure that the vehicle has better driving performance and reduce the reduction of the endurance mileage of the whole vehicle.
Further, because the battery package power supply switch is disconnected in the above-mentioned process, consequently fill electric pile and can not charge for the battery package to avoid filling the electric wire netting electricity among the electric pile and pouring into the battery package and the phenomenon of overcharging that leads to.
Furthermore, the vehicle-mounted charger and the thermal management system are awakened only when the battery pack has a heat preservation requirement, and the battery management system is awakened periodically, so that unnecessary awakening is reduced, and the energy consumption of the whole vehicle is greatly reduced.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a flow chart of a battery warm-up control method according to one embodiment of the present invention;
fig. 2 is a flowchart of a battery warm-keeping control method according to another embodiment of the present invention;
fig. 3 is a block diagram illustrating a structure of a battery thermal insulation control system according to an embodiment of the present invention when the battery thermal insulation control system is connected to a charging pile.
Detailed Description
Fig. 1 is a flowchart of a battery warm-keeping control method according to an embodiment of the present invention. As shown in fig. 1, in an embodiment, the method for controlling battery thermal insulation based on a power grid of the present invention includes:
step S10: and detecting the charging state of the vehicle and the plugging state of the vehicle-mounted charger 20 and the charging pile 10.
Step S20: judging whether the vehicle finishes charging the charging pile 10 and the vehicle-mounted charger 20 and the charging pile 10 are in an inserting state, if so, entering a step S30, and indicating that an alternating current charging gun of the vehicle is inserted into the external charging pile 10 all the time in the state without card swiping activation; otherwise, the step S10 is returned to for detection.
Step S30: the temperature of the battery pack 50 of the vehicle is detected.
Step S40: and judging whether the temperature of the battery pack 50 is lower than a first preset value T1, if so, entering the step S50, and if not, returning to the step S30.
Step S50: and controlling the vehicle-mounted charger 20 to send a charging request to the charging pile 10, and simultaneously controlling the power supply switch of the battery pack to be switched off, so that the thermal management system 30 of the vehicle obtains the energy of the charging pile 10 through the vehicle-mounted charger 20 and uses the energy to heat the battery pack 50. When the power supply switch of the battery pack is turned off, the vehicle-mounted charger 20 no longer transmits electric energy to the battery pack 50, and at this time, the thermal management system 30 of the vehicle obtains energy through the vehicle-mounted charger 20 to heat the battery pack 50.
Step S60: and judging whether the temperature of the battery pack 50 is higher than a second preset value T2, if so, entering a step S70, and if not, returning to the step S50 to continue charging and heating.
Step S70: and controlling the vehicle-mounted charger 20 to send a charging stop request to the charging pile 10 so as to stop the charging pile 10 from providing energy, wherein the second preset value T2 is higher than the first preset value T1. Optionally, the first preset value T1 is 0 ℃ and the second preset value T2 is 5 ℃.
The battery heat preservation control method is suitable for the situation that after the vehicle finishes charging the charging pile 10 and the vehicle-mounted charger 20 of the vehicle and the charging pile 10 are kept in the plug-in state, at this time, if the temperature of the battery pack 50 is lower than the first preset value T1, the charging pile 10 is controlled to provide energy for the thermal management system 30 of the vehicle until the temperature of the battery pack 50 reaches the second preset value T2. Therefore, the scheme can utilize the power supply of the power grid to keep the temperature of the battery pack 50, and the function aims to maintain the temperature of the battery pack 50 under the condition of long-time placement in a severe (extremely low temperature and extremely high temperature) environment so as to ensure that the vehicle has better driving performance and reduce the endurance mileage of the whole vehicle.
Further, because the battery package power supply switch is the disconnection among the above-mentioned process, consequently fill electric pile 10 and can not charge for the battery package to avoid filling the electric wire netting electricity among electric pile 10 and pouring into the battery package and the phenomenon of overcharging that leads to.
Fig. 2 is a flowchart of a battery warm-keeping control method according to another embodiment of the present invention. As shown in fig. 2, in another embodiment, after step S20, the method further includes:
step S22: starting a heat preservation period for timing and controlling the whole vehicle to enter a dormant state.
Step S24: the battery management system 40 of the vehicle is awakened every preset period, and after the battery management system 40 is awakened, the step S30 is performed to detect the temperature of the battery pack.
In this embodiment, an internal timer of the battery management system 40 may be used to execute a timing cycle wake-up scheme, the battery management system 40 maintains a timing function after the entire vehicle is dormant, and the battery management system 40 and related systems are woken up to detect the temperature change of the battery pack in a specified cycle, so that an intelligent adjustment wake-up cycle is realized, and unnecessary wake-up is reduced. Optionally, the preset period is determined according to the ambient temperature. For example, the ambient temperature is high, and the wake-up period is set to be longer, because the temperature of the battery pack cannot drop quickly; the low awakening frequency of ambient temperature sets up a bit higher, prevents that the battery package temperature from falling too low (the battery package is with the great cooling of difference in temperature faster).
As shown in fig. 2, in one embodiment, step S20 is followed by:
and when the temperature of the battery pack is lower than a first preset value T1, waking up the vehicle-mounted charger 20 and the thermal management system 30.
And calculating the total required energy consumption according to the required energy consumption of the thermal management system 30 and the low-voltage energy consumption of the whole vehicle.
The total required energy consumption is sent to the charging post 10 to provide energy to the thermal management system 30 and low voltage devices on the vehicle through the charging post 10 and the on-board charger 20.
In this embodiment, the vehicle-mounted charger 20 and the thermal management system 30 are awakened only when the battery pack has a heat preservation requirement (i.e., when the temperature of the battery pack is lower than the first threshold), and by combining the periodic awakening of the battery management system 40, unnecessary awakening is reduced, and the energy consumption of the whole vehicle is greatly reduced.
Optionally, the total energy demand is not greater than the sum of the energy demand of the thermal management system 30 and the overall low voltage energy consumption of the vehicle. When the total required energy consumption is equal to the sum of the required energy consumption of the thermal management system 30 and the low-voltage energy consumption of the whole vehicle, the vehicle-mounted charger 20 is controlled to distribute corresponding energy to the thermal management system 30 and low-voltage devices of the vehicle, for example, the electric energy is supplied to each controller which is awakened currently on the vehicle through a DC/DC converter of the vehicle. When the total required energy consumption is less than the sum of the required energy consumption of the thermal management system 30 and the low-voltage energy consumption of the whole vehicle (the less value can be set according to the requirement), the power supply of the power grid can be ensured not to be more than the energy consumption of the thermal management system 30, and the situation that redundant electric quantity is recharged to the battery pack is avoided. In the power range of the charging pile 10, the use of entertainment equipment such as an air conditioner of the whole vehicle is not influenced in the starting process of the heat preservation function.
As shown in fig. 2, in some embodiments of the present invention, after step S70, the method further includes:
step S80: and judging whether the timing duration of the heat preservation period reaches a time threshold t, if so, not waking up the battery management system 40 until the next charging is completed, otherwise, waking up the battery management system 40 of the vehicle at preset period intervals. The time threshold t here may be set to 24h or 1.5 days, etc.
In this embodiment, after the entire vehicle is charged, the battery pack is kept warm for a certain time, and if the vehicle-using probability is reduced after the time threshold t is exceeded, the battery pack is not awakened periodically, and a heat preservation period is triggered again after the next charging is completed.
Fig. 3 is a block diagram illustrating a structure of a battery thermal insulation control system according to an embodiment of the present invention when the battery thermal insulation control system is connected to a charging pile. The invention also provides a battery heat preservation control system based on the power grid, and in one embodiment, as shown in fig. 3, the battery heat preservation control system comprises an on-board charger 20(OBC), a thermal management system 30 and a battery management system 40 (BMS). And the vehicle-mounted charger 20 is connected with the charging pile 10. The thermal management system 30 is connected to the vehicle-mounted charger 20, and performs energy exchange with a battery pack of the vehicle through a heat exchange medium, where the heat exchange medium may be a cooling liquid, and the thermal management system 30 includes a heating unit for providing heat to the cooling liquid in the battery pack cooling system. The battery management system 40 is in signal connection with the vehicle-mounted charger 20, the thermal management system 30 and the battery pack, and is used for controlling the vehicle-mounted charger 20 to send a charging request to the charging pile 10 and simultaneously controlling the power supply switch of the battery pack to be switched off when the vehicle finishes charging the charging pile 10 and the vehicle-mounted charger 20 of the vehicle is in a plug-in state with the charging pile 10 and the temperature of the battery pack 50 of the vehicle is lower than a first preset value T1, so that the thermal management system 30 of the vehicle obtains the energy of the charging pile 10 through the vehicle-mounted charger 20 and uses the energy to heat. The battery pack power switch may be a battery pack main positive/negative relay provided in a battery system distribution Box (BUD), and when closed, the battery pack may be charged, and the relay is maintained in an off state in the present invention. The battery management system 40 is further configured to control the vehicle-mounted charger 20 to send a charging stop request to the charging pile 10 when the temperature of the battery pack 50 of the vehicle is higher than a second preset value T2, so that the charging pile 10 stops providing energy. Wherein, the second preset value T2 is higher than the first preset value T1. Optionally, the first preset value T1 is 0 ℃ and the second preset value T2 is 5 ℃.
The battery heat preservation control system of this embodiment utilizes the electric wire netting power supply to keep warm to the battery package, and whole heat preservation process charging gun links to each other with filling electric pile 10 always, can trigger the function of charging that fills electric pile 10 when receiving the instruction of charging, need not the activation of punching the card. The function aims to maintain the temperature of the battery pack under the condition of long-time placement in a severe (extremely low temperature and extremely high temperature) environment so as to ensure that the vehicle has better driving performance and reduce the reduction of the endurance mileage of the whole vehicle.
Further, because the battery package power supply switch is the disconnection among the above-mentioned process, consequently fill electric pile 10 and can not charge for battery package 50 to avoid filling the electric wire netting electricity among electric pile 10 and pouring into the battery package and the overcharge phenomenon that leads to.
In another embodiment, the battery management system 40 is further configured to start a thermal cycle timer after the vehicle finishes charging the charging pile 10 and keeps the vehicle-mounted charger 20 of the vehicle and the charging pile 10 in a plug-in state, wake up the vehicle at preset intervals, and detect the temperature of the battery pack 50 after waking up the vehicle.
In this embodiment, an internal timer of the battery management system 40 may be adopted to execute a timing cycle wake-up scheme, and the battery management system 40 maintains a timing function after the entire vehicle is dormant. The battery management system 40 has a self-wake-up function and is capable of periodically self-waking up. The battery management system 40 and related systems are awakened in a specified period to detect the temperature change of the battery pack 50, so that the intelligent adjustment of the awakening period is realized, and unnecessary awakening is reduced.
Optionally, the preset period is determined according to the ambient temperature. For example, the ambient temperature is high, and the wake-up period is set to be longer, because the temperature of the battery pack cannot drop quickly; the low awakening frequency of ambient temperature sets up a bit higher, prevents that the battery package temperature from falling too low (the battery package is with the great cooling of difference in temperature faster).
In some embodiments of the present invention, the battery management system 40 is further configured to wake up the vehicle-mounted charger 20 and the thermal management system 30 when the temperature of the battery pack 50 is lower than a first preset value T1, calculate a total required energy consumption according to the required energy consumption of the thermal management system 30 and the low-voltage energy consumption of the vehicle, and send the total required energy consumption to the charging pile 10, so as to provide energy to the thermal management system 30 and the low-voltage devices on the vehicle through the charging pile 10 and the vehicle-mounted charger 20.
In this embodiment, the vehicle-mounted charger 20 and the thermal management system 30 are awakened only when the battery pack 50 has a heat preservation requirement (i.e., when the temperature of the battery pack 50 is lower than the first threshold), and by combining the periodic awakening of the battery management system 40, unnecessary awakening is reduced, and the energy consumption of the whole vehicle is greatly reduced.
Optionally, the total energy demand is not greater than the sum of the energy demand of the thermal management system 30 and the overall low voltage energy consumption of the vehicle. When the total required energy consumption is equal to the sum of the required energy consumption of the thermal management system 30 and the low-voltage energy consumption of the whole vehicle, the vehicle-mounted charger 20 is controlled to distribute corresponding energy to the thermal management system 30 and low-voltage devices of the vehicle, such as various controllers awakened currently on the vehicle. When the total required energy consumption is less than the sum of the required energy consumption of the thermal management system 30 and the low-voltage energy consumption of the whole vehicle (the less value can be set according to the requirement), the power supply of the power grid can be ensured not to be more than the energy consumption of the thermal management system 30, and the surplus electric quantity is prevented from being recharged to the battery pack 50. In the power range of the charging pile 10, the use of entertainment equipment such as an air conditioner of the whole vehicle is not influenced in the starting process of the heat preservation function.
In another embodiment, the battery management system 40 is further configured to determine whether the duration of the thermal cycle timing reaches a time threshold t, and self-wake up every preset cycle when the duration of the thermal cycle timing does not reach the time threshold t, and no self-wake up is performed until the next charging is completed when the duration of the thermal cycle timing reaches the time threshold t. The time threshold t here may be set to 24h or 1.5 days, etc.
In this embodiment, after the entire vehicle is charged, the battery pack is kept warm for a certain time, and if the vehicle-using probability is reduced after the time threshold t is exceeded, the battery pack is not awakened periodically, and a heat preservation period is triggered again after the next charging is completed.
Optionally, the battery thermal insulation control system may further include a function switch, after the function switch is turned on, the battery management system 40 continuously determines the charging state of the battery pack 50 in the wake-up state, starts a battery thermal insulation period timer when charging is completed and the gun insertion state is maintained, the entire vehicle enters the sleep state, the battery management system 40 wakes up at preset intervals (for example, 4 hours), and starts to detect the temperature of the battery pack 50. When the temperature of the battery pack 50 is greater than the first preset value T1, the battery warm-up function is not triggered, the BMS may directly go to sleep without waking up other controllers, and this process requires about 10 seconds. When the BMS judges that the battery temperature is smaller than a first preset value T1, the BMS wakes up the response vehicle control unit, sends a heat management request to the heat management system 30 to start the battery heat preservation, stops heating when the battery temperature reaches a second preset value T2, the whole vehicle enters a sleep state, waits for the BMS to wake up again to judge the battery temperature, and if the timing of the heat preservation function cycle is larger than or equal to a time threshold T (for example, 24 hours), the BMS does not wake up again periodically, and waits for the next charging to complete triggering of the next heat preservation cycle.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A battery heat preservation control method based on a power grid is characterized by comprising the following steps:
after a vehicle finishes charging of a charging pile and a vehicle-mounted charger of the vehicle is in an inserted state with the charging pile, judging whether the temperature of a battery pack of the vehicle is lower than a first preset value or not;
when the temperature of a battery pack of the vehicle is lower than a first preset value, controlling the vehicle-mounted charger to send a charging request to the charging pile, and simultaneously controlling a power supply switch of the battery pack to be switched off, so that a thermal management system of the vehicle obtains energy of the charging pile through the vehicle-mounted charger and uses the energy to heat the battery pack;
and when the temperature of a battery pack of the vehicle is higher than a second preset value, controlling the vehicle-mounted charger to send a charging stopping request to the charging pile so that the charging pile stops providing energy, wherein the second preset value is higher than the first preset value.
2. The battery heat preservation control method according to claim 1, wherein after the step of maintaining a vehicle-mounted charger of the vehicle in a plug-in state with the charging pile after the vehicle completes charging of the charging pile, and before the step of determining whether the temperature of a battery pack of the vehicle is lower than a first preset value, the battery heat preservation control method further comprises:
starting a heat preservation period for timing and controlling the whole vehicle to enter a dormant state;
waking up a battery management system of the vehicle every a preset period;
and detecting the temperature of the battery pack after the battery management system is awakened.
3. The battery temperature keeping control method according to claim 2,
the preset period is determined according to the ambient temperature.
4. The battery heat preservation control method according to claim 3, wherein the step of controlling the vehicle-mounted charger to send a charging request to the charging pile when the temperature of the battery pack of the vehicle is lower than a first preset value comprises:
when the temperature of the battery pack is lower than a first preset value, the vehicle-mounted charger and the thermal management system are awakened;
calculating total required energy consumption according to the required energy consumption of the thermal management system and the low-voltage energy consumption of the whole vehicle;
and sending the total required energy consumption to the charging pile so as to provide energy for the thermal management system and low-voltage devices on the vehicle through the charging pile and the vehicle-mounted charger.
5. The battery temperature keeping control method according to claim 4,
and the total required energy consumption is not more than the sum of the required energy consumption of the thermal management system and the low-voltage energy consumption of the whole vehicle of the vehicle.
6. The battery heat preservation control method according to any one of claims 2 to 5, wherein after the step of controlling the vehicle-mounted charger to send a charging stop request to the charging pile when the temperature of the battery pack of the vehicle is higher than a second preset value, the method further comprises:
and judging whether the timing duration of the heat preservation period reaches a time threshold, if so, not waking up the battery management system until the next charging is completed, otherwise, waking up the battery management system of the vehicle at intervals of a preset period.
7. A battery heat preservation control system based on electric wire netting, its characterized in that includes:
the vehicle-mounted charger is connected with the charging pile;
the thermal management system is connected with the vehicle-mounted charger and exchanges energy with a battery pack of a vehicle through a heat exchange medium;
the battery management system is in signal connection with the vehicle-mounted charger, the thermal management system and the battery pack, the charging device is used for charging the vehicle after the vehicle finishes charging the charging pile, and a vehicle-mounted charger of the vehicle is in a plug-in state with the charging pile, and when the temperature of the battery pack of the vehicle is lower than a first preset value, controlling the vehicle-mounted charger to send a charging request to the charging pile, meanwhile, a power supply switch of the battery pack is controlled to be switched off, so that a thermal management system of the vehicle obtains the energy of the charging pile through the vehicle-mounted charger and uses the energy to heat the battery pack, the battery management system is also used for controlling the vehicle-mounted charger to send a charging stop request to the charging pile when the temperature of the battery pack of the vehicle is higher than a second preset value, so that the charging pile stops providing energy, wherein the second preset value is higher than the first preset value.
8. The battery keep warm control system of claim 7,
the battery management system is further used for starting a heat preservation period for timing after a vehicle finishes charging of the charging pile and keeps a vehicle-mounted charger of the vehicle and the charging pile in a plug-in state, self-awakening is carried out every other preset period, and the temperature of the battery pack is detected after the self-awakening, wherein the preset period is determined according to the ambient temperature.
9. The battery keep warm control system of claim 8,
the battery management system is further used for awakening the vehicle-mounted charger and the thermal management system when the temperature of the battery pack is lower than a first preset value, calculating total demand energy consumption according to the demand energy consumption of the thermal management system and the whole vehicle low-voltage energy consumption of the vehicle, and sending the total demand energy consumption to the charging pile so as to provide energy for the thermal management system and low-voltage devices on the vehicle through the charging pile and the vehicle-mounted charger, wherein the total demand energy consumption is not more than the sum of the demand energy consumption of the thermal management system and the whole vehicle low-voltage energy consumption of the vehicle.
10. The battery thermal insulation control system according to any one of claims 7 to 9,
the battery management system is also used for judging whether the time length of the heat preservation period timing reaches a time threshold value, and self-awakening is carried out at intervals of a preset period when the time length of the heat preservation period timing does not reach the time threshold value, and the self-awakening is not carried out until the next charging is completed when the time length of the heat preservation period timing reaches the time threshold value.
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Application publication date: 20210205 |