CN112693364A - Power battery preheating and charging heat preservation control method - Google Patents
Power battery preheating and charging heat preservation control method Download PDFInfo
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- CN112693364A CN112693364A CN202011581250.0A CN202011581250A CN112693364A CN 112693364 A CN112693364 A CN 112693364A CN 202011581250 A CN202011581250 A CN 202011581250A CN 112693364 A CN112693364 A CN 112693364A
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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
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/008—Arrangement or mounting of electrical propulsion units with means for heating the electrical propulsion units
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The invention discloses a power battery preheating and charging heat preservation control method, which comprises a battery preheating control step and a charging heat preservation control step, wherein a user triggers the preheating and charging heat preservation functions to be started through mobile phone app or TIHU; if not, entering a battery heat preservation control step to carry out heating control on the battery. The invention has the advantages that: the heating state of the battery is controlled under two conditions, so that the power battery can be heated and preheated reliably and effectively, the reliable and safe operation of the power battery of the vehicle is ensured, the user experience is improved, and the operation efficiency of the battery is improved.
Description
Technical Field
The invention relates to the field of temperature control of batteries of electric vehicles, in particular to a method for controlling preheating and charging heat preservation of batteries of electric vehicles.
Background
The power battery is a core component of a pure electric vehicle, the charging and discharging performance of the power battery is greatly influenced by temperature, particularly, in a low-temperature environment, the temperature of a battery core of the power battery is low, the activity is reduced, the charging characteristic and the discharging characteristic are poor, the efficiency of the charging process is low, the time is long, even the charging process cannot be carried out at ultralow temperature, the discharging process cannot release larger power, and the purposes of accelerating overtaking and the like cannot be fulfilled according to the intention of a driver;
therefore, in a low-temperature environment, the electric vehicle faces serious tests of charging and discharging, the driving experience of the electric vehicle in cold regions such as the north is directly influenced, and the electric vehicle cannot be popularized in a large area in the cold regions; for example, in cold regions, after the vehicle is placed for several hours after being charged, the power battery is cooled to a temperature at which high-power discharge cannot be performed, and when a driver turns on the vehicle, comfortable driving cannot be performed;
in order to solve the problem, in the prior art, heat insulation design treatment is generally carried out on the power battery, and the heat insulation design treatment comprises the steps of designing a power battery heat insulation box by using a heat insulation material, isolating the external temperature and reducing the speed of the temperature of the power battery influenced by the external environment temperature; also some schemes carry out heating control to the battery through increasing the PTC heater, and the control method that adopts PTC heating control of prior art is comparatively simple and still can't guarantee the vehicle and place the back in cold areas for a long time, and power battery still has great possibility to be cooled down to the temperature that power battery can't release great power and can't carry out great power and charge, brings very not good experience with the car for the user.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a control method for preheating and charging heat preservation of a power battery, which simplifies the control mode of preheating the power battery and can effectively and reliably realize the preheating, charging and heat preservation of the battery by controlling the starting of the vehicle-mounted PTC heating.
In order to achieve the purpose, the invention adopts the technical scheme that:
a power battery preheating and charging heat preservation control method is characterized by comprising the following steps: the method comprises a battery preheating control step and a charging heat preservation control step, wherein a user triggers a preheating or charging heat preservation function to start through a mobile phone app or TIHU, after the starting, an HVCM judges whether a charging plug is connected with a vehicle charging port, if so, the HVCM enters a remote charging or heating mode (note: the mode is not detailed in the patent), and the vehicle is charged or heated by using electric energy of a power grid; if not, entering a remote preheating mode, and heating the vehicle by using the electric energy of the power battery; before charging or after charging and heat preservation are started in the charging process, the HVCM judges whether a charging plug is connected or not and charges, if so, the charging process is continuously executed until the charging is finished and then enters a charging and heat preservation mode, and if not, the HVCM waits for starting charging and enters the charging and heat preservation mode after the charging is finished.
The battery warm-up control step includes:
1) the HVCM is awakened by the network, and simultaneously outputs a charging awakening hard wire signal to awaken the VCU, the BMS and the DCDC;
2) the BMS starts to monitor the temperature t of the power battery in real time, and when the temperature t of the battery is within a preset heating temperature range value, a BMS heating demand instruction is started, and the BMS sends the heating demand start instruction to the VCU;
3) after the VCU receives the heating demand opening instruction, the VCU sends a power-on instruction to the BMS, the BMS is high in voltage, the VCU starts to control the PTC to heat the power battery, and the heating state is fed back to the mobile phone app or TIHU.
The battery warm-up control step includes: further comprising the step of
4) The BMS monitors the temperature of the power battery in the preheating control step in real time, and when the temperature of the power battery reaches a set heating finishing temperature threshold, the BMS sends a heating demand closing instruction;
5) and the HVCM pulls down the charging awakening hard wire signal according to the closing instruction, triggers the VCU and the BMS power-off event, and the MCU releases the electric energy to finish the remote preheating step.
The charging heat preservation control step comprises:
step 1: a user sets a charging and heat-preserving function through the mobile phone APP/TIHU, the Tbox issues a charging and heat-preserving mode instruction to the bus, and the charging process is executed under the connection of a charging gun, so that whether the charging process is finished or not is judged in real time;
step 2: after charging, the Tbox starts charging and heat preservation timing, the HVCM controls a hard wire to wake up and keep continuous output, the VCU, the BMS, the OBC and the DCDC keep waking up and continuously work, when the mode is switched, the BMS controls the breaking of a main relay, and the HVCM controls a power supply part not to cut off a power supply;
and step 3: the BMS starts to monitor the temperature t of the power battery in real time, and when the temperature t is at a preset temperature threshold value, a BMS heating demand instruction is started;
and 4, step 4: the VCU charging permission flag bit is not permitted to be charged; the VCU requests PTC power; the OBC supplies power for the PTC by using the voltage constant voltage output reported by the power battery bus, and the HVCM sends PTC heating allowable power;
and 5: the VCU controls the PTC to start heating the power battery; the BMS monitors the temperature of the power battery in real time, when the temperature of the power battery reaches a preset heating stop temperature threshold value, a BMS heating demand instruction is closed, and the VCU feeds back a heating completion state;
step 6: after heating is finished, judging whether the heat preservation timing time is within the preset heat preservation duration, if so, returning to continue to execute the step 3; if not, executing step 7;
and 7: and when the timing time is longer than the preset heat preservation time after the heating is finished, the charging heat preservation mode is quitted, the HVCM pulls down the charging awakening hard wire signal after the last charging heat preservation is executed, a VCU (virtual circuit unit) and BMS (battery management system) power-off event is triggered, the MCU (microprogrammed control unit) electric energy is released, and the charging heat preservation process is finished.
In step 1 of the charging and heat-preserving step, the setting of the charging and heat-preserving function comprises the setting of triggering the activation of the charging and heat-preserving mode and the setting of the charging and heat-preserving working time.
In step 4, the HVCM sends a PTC heating enable power to the smaller of the output capability value of the OBC and the PTC requested power of the VCU.
The invention has the advantages that: the heating state of the battery is controlled under two conditions, so that the power battery can be heated and preheated reliably and effectively, the reliable and safe operation of the power battery of the vehicle is ensured, the user experience is improved, and the operation efficiency of the battery is improved.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a flow chart of a control method of the present invention;
FIG. 2 is a block diagram of a remote preheat configuration of the present invention;
fig. 3 is a block diagram of the charging and heat-preserving structure of the invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The invention provides a set of more complete automobile power battery thermal management control method, in a low-temperature cold region, the vehicle power battery can be preheated remotely by using a mobile phone APP terminal according to the requirements of a user, and the vehicle power battery can be ensured to be at the proper temperature for a long time after the vehicle charging is finished, so that the driving experience of the user is provided. When the vehicle is static, if the heating requirement is met in a future period of time, the remote preheating can be controlled through the remote preheating instruction, so that the vehicle can be used in time after the remote preheating is facilitated; and the main function that charges back heating keeps warm is for the vehicle keep warm when using again after charging, and the heat that this kind of mode heat preservation heating utilized also can reduce the energy consumption of battery for filling electric pile to conveniently charging the back use, generally charge the back electric motor car and all have the electric demand, consequently set up the function selection of heat preservation demand, can convenience of customers use and drive battery's heating.
The terms used herein are described as follows:
HVCM: a high-voltage control module for controlling the high-voltage,
BMS: battery management system
VCU: vehicle control system
And (3) OBC: vehicle-mounted charger
DCDC: DC converter
CMDC: vehicle-mounted charger (OBC) and direct current converter (DCDC) two-in-one integrated module
PTC: heating and control element
MCU: motor controller
TIHU: vehicle-mounted large-screen display host
min is to take the minimum value
The system comprises a remote preheating function and a charging heat preservation function, and is characterized in that the connection relation of modules related to the remote heating function is as shown in fig. 2: the user mobile phone app is connected with a vehicle-mounted TBOX through the TSP, then the TBOX, the HVCM, the DCDC, the BMS and the VCU are connected with one another through a CAN bus to read data and command signals on the CAN bus network, and the VCU is used for driving and controlling the PTC to work.
As shown in fig. 3, for the connection diagram of each module with the charging and heat preservation functions, the mobile phone app is connected with the TBOX through the TSP, the TBOX, the OBC, the VCU, the DCDC, the BMS, and the HVCM are connected with the external charging pile through the CAN network, the power grid is connected with the OBC through the vehicle plug, the BOC is used for supplying power to the PTC, and the VCU is used for controlling the operation of the PTC.
Remote preheating and charging heat preservation on APP are two independent buttons and two control modes. The main differences are: the remote preheating is mainly started after the charging is finished, the charging and heat preservation are started before the charging is started or in the charging process, and then the charging and heat preservation mode can be entered after the charging is finished (the HVCM can enter the Heating mode, the power grid is controlled not to be cut off, and the VCU, the BMS and other components are awakened continuously and are not in sleep)
Fig. 1 shows a flow chart of a control method of the present application, which includes a remote preheating process and a charging and heat-preserving process:
when the remote preheating is carried out:
step 1: the user selects (triggers) the preheating function of the remote power battery through the mobile phone APP, the HVCM judges whether the charging gun is connected or not, and if the charging gun is connected, the HVCM enters a remote charging/heating process; if not, entering step 2;
step 2: the HVCM is awakened by the network, and simultaneously outputs a charging awakening hard wire signal to awaken the VCU, the BMS and the DCDC;
and step 3: the BMS starts to monitor the temperature t of the power battery in real time, and when the temperature t is more than or equal to minus 25 ℃ and less than or equal to minus 10 ℃ (the threshold value can be calibrated according to different types of power batteries of different suppliers), the BMS heating demand instruction is started;
and 4, step 4: after the VCU receives a heating demand starting instruction, the VCU sends a power-on instruction, the high-voltage VCU on the BMS starts to control the PTC to heat the power battery, and the heating (in remote preheating) state is fed back to the Tbox;
and 5: the BMS monitors the temperature of the power battery in the whole process, when the temperature t of the power battery is more than or equal to 25 ℃, the BMS heating demand instruction is closed, and the VCU feeds back the heating completion state;
step 6: and the HVCM pulls down to charge and awaken a hard wire signal, a VCU and BMS power-off event is triggered, the MCU electric energy is released, and the remote preheating is finished.
During charging and heat preservation:
the charging and heat-preserving function is that after triggering charging and heat-preserving start, whether charging is finished or not is judged firstly, the charging is switched to enter the heat-preserving function after the charging is finished, the charging and heat-preserving mode of the HVCM needs to be switched to enter through a charging process, namely, after a charging and heat-preserving instruction is accessed, whether the charging step is finished or not is judged firstly, the heat-preserving mode can be entered only after the charging is finished, and the MCU does not discharge electric energy after the charging is finished, and can not independently input power supply when the charging is not carried out and the pre-charging is;
step 1: a user sets a charging and heat-preserving function (heat-preserving mode activation and heat-preserving duration setting) through the mobile phone APP/TIHU, the Tbox issues a charging and heat-preserving mode instruction to the bus, and a charging or heating process is executed under the connection of a charging gun; at the moment, after entering a charging mode, entering a heat preservation mode;
step 2: after charging, the Tbox starts charging heat preservation timing, the HVCM enters a charging heat preservation mode (Heating) to control a 12V hard wire to wake up and keep continuous output, the VCU, the BMS, the OBC and the DCDC keep waking up and continuously work, when the mode is switched, the BMS controls the breaking of a main relay, and the HVCM controls a power supply part not to cut off a power supply;
and step 3: the BMS starts to monitor the temperature t of the power battery in real time, and when the temperature t is more than or equal to minus 25 ℃ and less than or equal to minus 10 ℃ (the threshold value can be calibrated according to different types of power battery batteries of different suppliers), the BMS heating demand instruction is started;
and 4, step 4: the VCU charging permission flag bit is Dischargeable allow and does not permit charging, and the VCU requests PTC power; the OBC reports voltage constant voltage output by a power battery bus, and the HVCM sends PTC heating allowable power (the PTC request power of the VCU and the output capacity value of the OBC take min);
and 5: the VCU controls the PTC, the water pump, the three-way valve and the like to start heating the power battery, the BMS monitors the temperature of the power battery in the whole process, when the temperature t of the power battery is more than or equal to 25 ℃, the BMS heating demand instruction is closed, and the VCU feeds back the heating completion state;
step 6: after the heating and heat preservation are finished, if the temperature is still within the range of the charging and heat preservation duration, returning to continuously execute the charging and heat preservation mode detection and heat preservation heating processes in the steps 2-5; if the heating and heat preservation time is longer than the heat preservation time after the heating and heat preservation are finished, executing the step 7; if the set time is 3 hours, if the set time is less than 3 hours, circularly executing step 3 to judge the temperature until the power battery is started to heat and then the power battery is started to finish, judging whether the time exceeds, if the time does not exceed 3 hours, continuously circulating step 3, and if the time exceeds, entering step 7.
And 7: after the heat preservation time is exceeded, the Tbox exits the charging heat preservation mode, the HVCM pulls down the charging awakening hard wire signal after the last charging heat preservation is executed, the VCU and the BMS are triggered to power off, the MCU is used for discharging electric energy, and the charging heat preservation process is finished. The invention discloses a thermal management control method of a pure electric vehicle power battery, which comprises the following steps:
1. after charging is finished, the HVCM responds to a Tbox charging heat preservation mode instruction and controls the OBC and the DCDC to enter a Heating mode; BMS, VCU have self-checking after awakening.
2. And in an HVCM heat preservation mode, the output of a 12V hard wire wake-up signal is continuously kept, a VCU and a BMS are awakened, and the information such as the state of the whole vehicle and the temperature of a power battery is monitored in real time.
3. And the Tbox performs heat preservation mode timing after the charging is finished, continues outputting a heat preservation mode instruction within a set heat preservation time, cancels the heat preservation mode after the heat preservation time is exceeded, and quits the charging and heat preservation of the whole vehicle after the last heat preservation function is finished.
4. After charging, the BMS autonomously controls the cut-off of an internal main positive relay, the HVCM continuously works in a constant voltage working mode according to the BMS reported voltage control CMDC, the MCU does not discharge electric energy, and the large-current impact of a large capacitor on the HVCM and the OBC is prevented from damaging components.
5. And the HVCM detects and compares the output capacity of the OBC and the required capacity of the VCU for the PTC power, and releases the PTC power according to the min value.
The pure electric vehicle power battery charging heat preservation and remote preheating method provided by the invention mainly achieves the following beneficial effects:
1. in a charging heat preservation mode: utilize on-vehicle wireless communication module T-box to carry out switching control to vehicle charging heat preservation function (mode), high voltage control module HVCM control 12V hard line awakens up the output, and under the function is opened, each control module who participates in charging keeps awakening up not dormancy, and BMS real time supervision battery package temperature sends the heating heat preservation demand according to the temperature threshold value that predetermines, and VCU, HVCM, OBC carry out the heat preservation function that charges.
2. Before going (when not charging), carry out long-range preheating control to vehicle battery package through cell-phone APP.
When the vehicle is charged and the vehicle is not charged, the problem that the battery temperature is too low to release large power under a cold condition, vehicle using experience of a user is influenced, and complaints of the user are reduced is solved.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (6)
1. A power battery preheating and charging heat preservation control method is characterized by comprising the following steps: the method comprises a battery preheating control step and a charging heat preservation control step, wherein a user triggers a preheating or charging heat preservation function to start through mobile phone app or TIHU, after the starting, HVCM judges whether a charging plug is connected with a vehicle charging port, if so, the HVCM enters a remote charging or heating mode, and the vehicle is charged or heated by using electric energy of a power grid; if not, entering a remote preheating mode, and heating the vehicle by using the electric energy of the power battery; before charging or after charging and heat preservation are started in the charging process, the HVCM judges whether a charging plug is connected or not and charges, if so, the charging process is continuously executed until the charging is finished and then enters a charging and heat preservation mode, and if not, the HVCM waits for starting charging and enters the charging and heat preservation mode after the charging is finished.
2. The method for controlling the preheating and charging heat preservation of the power battery as claimed in claim 1, wherein: the battery warm-up control step includes:
1) the HVCM responds to the Tbox instruction and is awakened by the network, and simultaneously outputs a charging awakening hard wire signal to awaken the VCU, the BMS and the DCDC;
2) the BMS starts to monitor the temperature t of the power battery in real time, and when the temperature t of the battery is within a preset heating temperature range value, a BMS heating demand instruction is started, and the BMS sends the heating demand start instruction to the VCU;
3) after the VCU receives the heating demand opening instruction, the VCU sends a power-on instruction to the BMS, the BMS is high in voltage, the VCU starts to control the PTC to heat the power battery, and the heating state is fed back to the mobile phone app or TIHU.
3. The method for controlling the preheating and charging heat preservation of the power battery as claimed in claim 2, wherein: the battery warm-up control step further includes:
4) the BMS monitors the temperature of the power battery in the preheating control step in real time, and when the temperature of the power battery reaches a set heating finishing temperature threshold, the BMS sends a heating demand closing instruction;
5) and the HVCM pulls down the charging awakening hard wire signal according to the closing instruction, triggers the VCU and the BMS power-off event, and the MCU releases the electric energy to finish the remote preheating step.
4. The method for controlling the preheating and charging heat preservation of the power battery as claimed in claim 1 or 2, wherein: the charging heat preservation control step comprises:
step 1: a user sets a charging and heat-preserving function through the mobile phone APP/TIHU, the Tbox issues a charging and heat-preserving mode instruction to the bus, and the charging process is executed under the connection of a charging gun, so that whether the charging process is finished or not is judged in real time;
step 2: after charging, the Tbox starts charging and heat preservation timing, the HVCM controls a hard wire to wake up and keep continuous output, the VCU, the BMS, the OBC and the DCDC keep waking up and continuously work, when the mode is switched, the BMS controls the breaking of a main relay, and the HVCM controls a power supply part not to cut off a power supply;
and step 3: the BMS starts to monitor the temperature t of the power battery in real time, and when the temperature t is at a preset temperature threshold value, a BMS heating demand instruction is started;
and 4, step 4: the VCU charging permission flag bit is not permitted to be charged; the VCU requests PTC power; the OBC supplies power for the PTC by using the voltage constant voltage output reported by the power battery bus, and the HVCM sends PTC heating allowable power;
and 5: the VCU controls the PTC to start heating the power battery; the BMS monitors the temperature of the power battery in real time, when the temperature of the power battery reaches a preset heating stop temperature threshold value, a BMS heating demand instruction is closed, and the VCU feeds back a heating completion state;
step 6: after heating is finished, judging whether the heat preservation timing time is within the preset heat preservation duration, if so, returning to continue to execute the step 3; if not, executing step 7;
and 7: and when the timing time is longer than the preset heat preservation time after the heating is finished, the charging heat preservation mode is quitted, the HVCM pulls down the charging awakening hard wire signal after the last charging heat preservation is executed, a VCU (virtual circuit unit) and BMS (battery management system) power-off event is triggered, the MCU (microprogrammed control unit) electric energy is released, and the charging heat preservation process is finished.
5. The method for controlling preheating and charging heat preservation of the power battery as claimed in claim 4, wherein: in step 1 of the charging and heat-preserving step, the setting of the charging and heat-preserving function comprises the setting of triggering the activation of the charging and heat-preserving mode and the setting of the charging and heat-preserving working time.
6. The method for controlling preheating and charging heat preservation of the power battery as claimed in claim 4, wherein: in step 4, the HVCM sends a PTC heating enable power to the smaller of the output capability value of the OBC and the PTC requested power of the VCU.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113341909A (en) * | 2021-04-27 | 2021-09-03 | 浙江合众新能源汽车有限公司 | Battery constant-temperature thermal management control strategy based on user selection |
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| CN113341909A (en) * | 2021-04-27 | 2021-09-03 | 浙江合众新能源汽车有限公司 | Battery constant-temperature thermal management control strategy based on user selection |
| CN113997828A (en) * | 2021-12-17 | 2022-02-01 | 宜宾凯翼汽车有限公司 | Quick charging heating control method for electric automobile at low temperature |
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| WO2024041076A1 (en) * | 2022-08-25 | 2024-02-29 | 中国第一汽车股份有限公司 | Charger connected thermal insulation control system and method for power battery, vehicle, and medium |
| CN116494834A (en) * | 2023-06-28 | 2023-07-28 | 广汽埃安新能源汽车股份有限公司 | Electric automobile battery heat preservation control method, device and system and electric automobile |
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