CN113895310B - Intelligent temperature control method and system for power battery, vehicle and storage medium - Google Patents
Intelligent temperature control method and system for power battery, vehicle and storage medium Download PDFInfo
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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
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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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- B60L58/26—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 cooling
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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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- 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
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- 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
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Abstract
The invention provides a power battery intelligent temperature control method, a system, a vehicle and a storage medium, which are characterized in that a power battery cooling/heating starting temperature control threshold value is determined according to the SOC (state of charge) and the ambient temperature of the power battery; judging whether the temperature is higher than or lower than a power battery cooling/heating starting temperature control threshold according to the power battery real-time temperature, if so, starting a cooling/heating circulation loop, and determining a power battery cooling target temperature/power battery heating target temperature and a cooling liquid target temperature according to the power battery SOC and the environment temperature; and finally, determining the rotating speed of the air conditioner compressor, the water heating PTC power, the flow rate of cooling liquid of the cooling circuit and the flow rate of cooling liquid of the heating circuit according to the cooling target temperature of the power battery, the heating target temperature of the power battery and the cooling liquid target temperature of the cooling circuit and the heating circuit. The invention can increase the control refinement degree and realize the optimal control of the temperature of the power battery.
Description
Technical Field
The invention is used in the technical field of power batteries of new energy automobiles, and particularly relates to an intelligent temperature control technology of a power battery.
Background
In recent years, all cart enterprises in the world have proposed an electric transformation plan, and China in 2021 has also proposed a macroscopic goal of 2030 carbon peak and 2060 carbon neutralization, so that new energy automobiles have become the necessary development direction of the automobile industry. And the power electrodynamic performance of the new energy automobile is dependent on a power battery. The power battery is composed of different numbers of battery monomers in series-parallel connection, and all performances of capacity, internal resistance, charge and discharge power, aging, safety and the like are sensitive to temperature change, so that the working temperature of the power battery needs to be controlled within a reasonable temperature range. The industry adopts heat management systems such as air cooling, PTC heating in the power battery, heating films in the power battery, liquid cooling liquid heating and the like to cool/heat the power battery so as to effectively control the power battery to be in an optimal working temperature range, and the main stream is the liquid cooling liquid heating heat management system at present. The liquid cooling liquid heat thermal management system mainly comprises a water heating PTC, a water pump, a compressor, a condenser, a warm air core, an evaporator, a cooler, a thermal expansion valve, a water cooling pipeline and the like to form a power battery cooling/heating circulation loop, and the power battery management system and a whole vehicle air conditioner controller cooperatively control the opening/closing of the cooling/heating circulation loop, the rotating speed of the air conditioner compressor/the heating power of the water heating PTC, the flow rate of cooling liquid, the temperature of the cooling liquid and the target temperature of the power battery based on a certain power battery temperature control method, so that the optimal control of the temperature of the power battery is realized.
Patent document CN111969280a discloses a power battery temperature control method, a device and an electronic apparatus, which is to perform thermal management system control according to a real-time temperature of a power battery and a cooling medium temperature, namely, a cooling liquid temperature, specifically, to control a cooling or heating circulation loop of the power battery to be started according to a temperature interval threshold value where the real-time temperature of the power battery is located, and then control an air conditioner compressor rotation speed/water heating PTC heating power and a water pump rotation speed (equivalent to control a cooling liquid flow rate) according to the cooling liquid temperature. This method has the following problems: 1. the difference of the target temperature setting of the cooling liquid under different working conditions is not considered, for example, during the power battery extrapolation charging process, the different target temperature setting of the cooling liquid according to the SOC (state of charge) state of the power battery is considered. The higher the SOC, the higher the coolant target temperature, etc. 2. The cooling/heating cycle is closed regardless of the difference in target temperature setting of the power cell, i.e., how much the power cell temperature is controlled, under different conditions. The control method has the problems of simpler control mode, insufficient refinement and excessive control or insufficient control.
Disclosure of Invention
In view of the above, the invention provides an intelligent temperature control method for a power battery, which increases the control refinement degree and realizes the optimal control of the temperature of the power battery.
The technical scheme of the invention is as follows:
an intelligent temperature control method for a power battery, comprising the following steps:
the power battery cooling/heating start temperature control threshold is first determined based on the power battery SOC and the ambient temperature.
And judging whether the temperature is higher than or lower than a power battery cooling/heating starting temperature control threshold according to the power battery real-time temperature, if so, starting a cooling/heating circulation loop, and determining a power battery cooling target temperature BatCoolTargetTemp/power battery heating target temperature BatHeatTargetTemp and a cooling liquid target temperature CoolLiquidTargetTemp according to the power battery SOC and the environment temperature.
And finally, determining the rotating speed of the air conditioner compressor/the PTC power of the water heating, the flow rate of cooling circuit cooling liquid and the flow rate of heating circuit cooling liquid according to the cooling target temperature BatCoolTargetTemp of the power battery and the cooling liquid target temperature CoolLioquidTargetTemp.
Further, the method comprises the following specific steps:
s1, acquiring the current real-time temperature, the environment temperature and the power battery SOC of the power battery.
S2, determining a power battery cooling start temperature control threshold value BatCoolEnableTheld and a power battery heating start temperature control threshold value BatHeatEnableTheld according to the SOC of the power battery and the ambient temperature;
and S3, judging whether the real-time temperature of the power battery is higher than a control threshold value BatCoolEnablethld of the cooling starting temperature of the power battery, if so, entering S4, and if not, entering S5.
S4, controlling the opening of a cooling circulation loop, determining a cooling target temperature BatCoolTargetTemp of the power battery and a cooling liquid target temperature CoolLiquidTargetTemp according to the SOC of the power battery and the ambient temperature, and then determining the rotation rate of an air conditioner compressor and the flow rate of cooling liquid of the cooling loop; after reaching the power cell cooling target temperature BatCoolTargetTemp, the circuit is closed, and the process proceeds to S5.
S5, judging whether the real-time temperature of the power battery is lower than a heating start temperature control threshold value BatHeatEnablethld, if so, entering a step 6, and if not, ending.
S6, controlling the heating circulation loop to be opened, determining a power battery heating target temperature BatHeatTargetTemp and a cooling liquid target temperature CoolLiquidTargetTemp according to the power battery SOC and the environment temperature, and determining the water heating PTC power and the cooling liquid flow rate of the heating loop; after reaching the power battery heating target temperature BatHeatTargetTemp, the loop is closed, and the process is finished.
Further, the step S4 specifically includes:
s41, controlling the opening of the cooling circulation loop.
S42, determining a power battery cooling target temperature BatCoolTargetTemp and a cooling liquid target temperature CoolLiquidTargetTemp according to the power battery SOC and the ambient temperature.
S43, determining the rotating speed of the air conditioner compressor and the cooling circuit cooling liquid flow rate according to the cooling liquid target temperature CoolLiquidTargetTemp.
S44, in the process of cooling the power battery, judging whether the real-time temperature of the power battery reaches the target cooling temperature BatCoolTargetTemp of the power battery in real time; if yes, go to S45, otherwise jump to S42, continue cooling the power battery.
And S45, controlling the cooling circulation loop to be closed.
Further, the step S6 specifically includes:
s61, controlling the heating circulation loop to be opened.
S62, determining a power battery heating target temperature BatHeatTargetTemp and a cooling liquid target temperature CoolLiquidTargetTemp according to the power battery SOC and the ambient temperature.
S63, determining the PTC power of the water heating and the flow rate of the cooling liquid of the heating circuit according to the target temperature CoolLiquidTargetTemp of the cooling liquid.
S64, in the process of cooling the power battery, judging whether the real-time temperature of the power battery reaches the heating target temperature BatHeatTattrgetTemp of the power battery in real time, if so, entering S65, otherwise, jumping to S62.
S65, controlling the heating circulation loop to be closed.
Another object of the present invention is to provide an intelligent temperature control system for a power battery, which includes the following modules:
and the information acquisition module is used for acquiring the current real-time temperature, the ambient temperature and the power battery SOC of the power battery.
The threshold calculation module is used for determining a power battery cooling starting temperature control threshold and a power battery heating starting temperature control threshold according to the power battery SOC and the ambient temperature.
The first judging module is used for judging whether the real-time temperature of the power battery is higher than the control threshold value of the cooling starting temperature of the power battery, if so, sending information to the first control module, and if not, sending information to the second judging module.
The first control module is used for controlling the opening of the cooling circulation loop, determining the cooling target temperature and the cooling liquid target temperature of the power battery according to the SOC and the ambient temperature of the power battery, and then determining the rotation rate of the air conditioner compressor and the flow rate of the cooling liquid of the cooling loop; and after the cooling target temperature of the power battery is reached, closing the loop and sending information to the second judging module.
And the second judging module is used for judging whether the real-time temperature of the power battery is lower than the heating start temperature control threshold value, if so, sending information to the second control module, and if not, ending.
The second control module is used for controlling the heating circulation loop to be opened, determining the heating target temperature of the power battery and the target temperature of the cooling liquid according to the SOC of the power battery and the ambient temperature, and determining the PTC power of the water heating and the flow rate of the cooling liquid of the heating loop; after the power battery heating target temperature is reached, the loop is closed.
It is a further object of the present invention to provide a vehicle equipped with the intelligent temperature control system for a power battery described above.
It is also an object of the present invention to provide a computer readable storage medium having stored thereon a computer program which when executed by a processor realizes the steps of implementing the intelligent temperature control method of a power battery.
The invention has the advantages that:
1. the invention fully considers the differential setting of the power battery cooling starting temperature control threshold, the power battery heating starting temperature control threshold, the power battery cooling target temperature, the power battery heating target temperature, the cooling liquid target temperature and the cooling liquid flow rate under different working conditions. Different power battery cooling start temperature control thresholds and power battery heating start temperature control thresholds are set through power battery SOC and environmental temperature difference under different working conditions, a power battery cooling target temperature threshold and a power battery heating target temperature threshold are set, a cooling liquid target temperature threshold is set according to the cooling liquid target temperature threshold, different air conditioner compressor rotating speeds/water heating PTC powers are set according to the cooling liquid target temperature threshold, and cooling circuit cooling liquid flow rate/heating circuit cooling liquid flow rate are set, so that fine control of intelligent temperature control of the power battery is achieved, and overcooling/heating or insufficient cooling/heating is prevented.
2. According to the invention, the power battery cooling circuit is controlled to be started by the power battery cooling starting temperature control threshold value, the power battery cooling target temperature is controlled to be closed by the power battery cooling circuit, the power battery heating circuit is controlled to be started by the power battery heating starting temperature control threshold value, and the power battery heating circuit is controlled to be closed by the power battery heating target temperature, so that the problems of low power battery cooling efficiency or low heating efficiency caused by the fact that the power battery cooling circuit is frequently switched in the on-off state or the power battery heating circuit is frequently switched in the on-off state under the condition that the power battery temperature is unstable in the past by adopting the same temperature control threshold value to control the power battery cooling circuit to be started or closed or the same temperature control threshold value to control the power battery heating circuit to be started and closed are avoided. For example, when the temperature of the power battery fluctuates at 35+/-1 ℃, if 35 ℃ is adopted as a temperature control threshold value for controlling the power battery cooling circuit to be opened and closed, the power battery cooling circuit is controlled to be opened when the temperature of the power battery is 36 ℃, and when the temperature of the power battery is 34 ℃, the power battery cooling circuit is controlled to be closed instead, so that the power battery cooling circuit is continuously switched between the opened and closed states within a short time, and the cooling efficiency is affected. The method adopted by the invention is that after the power battery temperature is 36 ℃ and the power battery cooling circuit is controlled to be started, the power battery cooling circuit is controlled to be closed until the power battery temperature is reduced to 32 ℃, so as to ensure that the power battery cooling circuit is closed after the power battery temperature is indeed reduced, and avoid frequent switching of the power battery cooling circuit in the on-off state.
Drawings
FIG. 1 is a flow chart of a method for intelligent temperature control of a power battery.
Detailed Description
The invention is further described below with reference to the drawings and examples.
Example 1
In this embodiment, the flow of the intelligent temperature control method of the power battery is shown in fig. 1, and the overall implementation process is as follows:
s1, acquiring the current real-time temperature, the environment temperature and the power battery SOC of the power battery.
S2, determining a power battery cooling start temperature control threshold value BatCoolEnablethld and a power battery heating start temperature control threshold value BatHeatEnablethld according to the SOC of the power battery and the ambient temperature.
In this embodiment, the determination mode of the power battery cooling start temperature control threshold value batcoolenable is that the power battery SOC, the ambient temperature are checked by a linear interpolation look-up table method, and the two-dimensional MAP table of the power battery SOC, the ambient temperature and the power battery cooling start temperature control threshold value is obtained, as shown in table 1, the higher the ambient temperature, the smaller the SOC, and the lower the power battery cooling start temperature control threshold value.
Table 1 two-dimensional MAP table of power cell SOC, ambient temperature, and power cell cooling on temperature control threshold.
In this embodiment, the power battery heating start temperature control threshold value BatHeatEnableThld is obtained by checking a two-dimensional MAP table of the power battery SOC, the ambient temperature and the power battery heating start temperature control threshold value by using a linear interpolation table look-up method, as shown in table 2. The lower the ambient temperature, the smaller the SOC, and the lower the power battery cooling-on temperature control threshold.
Table 2 two-dimensional MAP table of power cell SOC, ambient temperature, and power cell heating on temperature control threshold.
S3, judging whether the real-time temperature of the power battery is higher than the control threshold value BatCoolEnablethld of the cooling start temperature of the power battery? If yes, executing S4; if not, jumping to S5;
s4, controlling the opening of a cooling circulation loop, determining a cooling target temperature BatCoolTargetTemp of the power battery and a cooling liquid target temperature CoolLiquidTargetTemp according to the SOC of the power battery and the ambient temperature, and then determining the rotation rate of an air conditioner compressor and the flow rate of cooling liquid of the cooling loop; after reaching the power cell cooling target temperature BatCoolTargetTemp, the circuit is closed, and the process proceeds to S5.
The step S4 specifically includes S41, S42, S43, S44, and S45 in fig. 1.
And S5, judging whether the real-time temperature of the power battery is lower than a heating start temperature control threshold value BatHeatEnablethld, if so, entering a step 6, if not, not performing any action, and ending the temperature control task.
S6, controlling the heating circulation loop to be opened, determining a power battery heating target temperature BatHeatTargetTemp and a cooling liquid target temperature CoolLiquidTargetTemp according to the power battery SOC and the environment temperature, and determining the water heating PTC power and the cooling liquid flow rate of the heating loop; after reaching the power battery heating target temperature BatHeatTargetTemp, the loop is closed, and the process is finished.
Example 2
In this embodiment, the specific implementation procedure of S4 is specifically described if the real-time temperature of the power battery is higher than the power battery cooling start temperature control threshold value batcoolenable thlds:
s41, controlling the cooling circulation loop to be opened, reducing the temperature of the cooling liquid through the air conditioner compressor, controlling the flow rate of the cooling liquid through the water pump, pumping the cooling liquid into the power battery cooling circulation pipeline, and attaching the power battery module to the water cooling pipeline, so that heat of the power battery is taken away, and radiating the power battery.
S42, determining a power battery cooling target temperature BatCoolTargetTemp and a cooling liquid target temperature CoolLiquidTargetTemp according to the power battery SOC and the ambient temperature in the process of starting a cooling circulation loop.
In this embodiment, the power battery cooling target temperature BatCoolTargetTemp is obtained by checking a two-dimensional MAP table of the power battery SOC, the ambient temperature and the power battery cooling target temperature control threshold by using a linear interpolation table look-up method, see table 3.
TABLE 3 two-dimensional MAP table for Power Battery SOC, ambient temperature, and Power Battery Cooling target temperature
As seen from table 3, the higher the ambient temperature, the smaller the SOC, and the lower the power cell cooling target temperature BatCoolTargetTemp. And under the same power battery SOC and ambient temperature, the power battery cooling target temperature BatCoolTargetTemp is lower than the power battery cooling start temperature control threshold value BatCoolEnablethld.
In this embodiment, the coolant target temperature coolliquidtarget temp is obtained by looking up a two-dimensional MAP table of the power battery SOC, the ambient temperature and the coolant target temperature coolliquidtarget temp by using a linear interpolation look-up table method, as shown in table 4.
TABLE 4 two-dimensional MAP table for power cell SOC, ambient temperature, and coolant target temperature during power cell cooling
As can be seen from table 4, the higher the ambient temperature, the smaller the SOC, and the lower the coolant target temperature coolliquidtgetemp.
S43, after the cooling target temperature BatCoolTargetTemp of the power battery and the cooling target temperature CoolLiquidTargetTemp are determined, the rotating speed of the air conditioner compressor and the cooling circuit cooling liquid flow rate are determined according to the cooling target temperature CoolLiquidTargetTemp. The determination mode is that the one-dimensional MAP table (see table 5) of the target temperature CoolLiquidTargetTemp of the cooling liquid and the rotation speed of the air conditioner compressor is respectively checked by adopting a linear interpolation table look-up method, and the rotation speed of the air conditioner compressor and the flow speed of the cooling liquid are determined by adopting the one-dimensional MAP table (see table 6) of the target temperature CoolLiquidTargetTemp of the cooling liquid and the flow speed of the cooling liquid of the cooling circuit.
| Target temperature of coolant | 12℃ | 15℃ | 18℃ | 20℃ | 22℃ |
| Air conditioner compressor | 3000r/min | 2800r/min | 2600r/min | 2400r/min | 2200r/min |
TABLE 5 one-dimensional MAP table for target coolant temperature and air conditioner compressor speed during cooling of power battery
| Target temperature of coolant | 12℃ | 15℃ | 18℃ | 20℃ | 22℃ |
| Flow rate of cooling liquid | 12L/min | 11L/min | 10L/min | 9L/min | 8L/min |
TABLE 6 one-dimensional MAP table for target coolant temperature and air conditioner compressor speed during cooling of power battery
From the above table, it can be seen that the lower the coolant target temperature coolliquidtagetemp, the greater the air conditioner compressor speed and the faster the cooling circuit coolant flow rate.
S44, in the process of cooling the power battery, whether the real-time temperature of the power battery reaches the cooling target temperature BatCoolTargetTemp of the power battery needs to be judged in real time, if so, S45 is entered, otherwise, the process goes to S42, and the cooling of the power battery is continued.
And S45, controlling the cooling circulation loop to be closed.
Example 3
In this embodiment, the specific control procedure of step S6 is specifically described if the real-time temperature of the power battery is lower than the power battery heating start temperature control threshold value BatHeatEnableThld:
s61, controlling the heating circulation loop to be opened. The temperature of the cooling liquid is increased through the water heating PTC, the flow rate of the cooling liquid is controlled through the water pump, the cooling liquid is pumped into the power battery heating circulation pipeline, the power battery module is attached to the internal heating circulation pipeline, heat is transferred to the power battery module, and therefore the power battery module is heated.
S62, determining a power battery heating target temperature BatHeatTargetTemp and a cooling liquid target temperature CoolLiquidTargetTemp according to the power battery SOC and the ambient temperature in the process of starting a heating circulation loop.
In this embodiment, the power battery heating target temperature BatHeatTargetTemp is obtained by checking a two-dimensional MAP table of power battery SOC, ambient temperature and power battery heating target temperature BatHeatTargetTemp control threshold by using a linear interpolation look-up table method, and table 7 is shown.
TABLE 7 two-dimensional MAP table for Power Battery SOC, ambient temperature, and Power Battery heating target temperature
As seen from table 7, the lower the ambient temperature, the smaller the SOC, and the higher the power battery heating target temperature BatHeatTargetTemp. And under the same power battery SOC and ambient temperature, the power battery heating target temperature BatHeatTargetTemp is higher than the power battery heating start temperature control threshold value BatHeatEnablethld.
In this embodiment, the coolant target temperature coolliquiddtargettemp is obtained by checking a two-dimensional MAP table of the power battery SOC, the ambient temperature and the coolant target temperature coolliquiddtargettemp by using a linear interpolation table lookup method through the power battery SOC and the ambient temperature, as shown in table 8.
TABLE 8 two-dimensional MAP table for SOC of power battery, ambient temperature, and target temperature of coolant when heating power battery
As can be seen from table 8, the lower the ambient temperature, the smaller the SOC, and the higher the coolant target temperature coolliquidtgetemp.
S63, after the power battery heating target temperature BatHeatTargetTemp and the cooling liquid target temperature CoolLiquidTargetTemp are determined, the water heating PTC power and the heating circuit cooling liquid flow rate are determined according to the cooling liquid target temperature CoolLiquidTargetTemp.
The specific determination method is that the one-dimensional MAP table (see table 9) of the cooling liquid target temperature CoolLiquidTargetTemp and the water heating PTC power and the one-dimensional MAP table (see table 10) of the cooling liquid target temperature CoolLiquidTargetTemp and the heating circuit cooling liquid flow rate are respectively checked by adopting a linear interpolation table look-up method to determine the water heating PTC power and the heating circuit cooling liquid flow rate.
| Target temperature of coolant | 29℃ | 32℃ | 35℃ | 38℃ | 40℃ |
| PTC power of water heater | 3kw | 3.5kw | 4kw | 4.5kw | 5kw |
TABLE 9 one-dimensional MAP table for target temperature of coolant and PTC power of water heater when power battery is heated
| Target temperature of coolant | 29℃ | 32℃ | 35℃ | 38℃ | 40℃ |
| Flow rate of cooling liquid | 8L/min | 9L/min | 10L/min | 11L/min | 12L/min |
TABLE 10 one-dimensional MAP table for target coolant temperature and coolant flow rate in heating circuit for heating power battery
From the above two tables, it can be seen that the higher the coolant target temperature coolliquidtagetemp, the greater the water heating PTC power and the faster the heating circuit coolant flow rate.
S64, in the process of cooling the power battery, whether the real-time temperature of the power battery reaches the heating target temperature BatHeatTattrgetTemp of the power battery needs to be judged in real time, if so, S65 is started, otherwise, the process jumps to S62, and the power battery is continuously heated.
S65, controlling the heating circulation loop to be closed.
Example 4:
the embodiment is an intelligent temperature control system for a power battery, and the control method for realizing the embodiment comprises the following modules:
and the information acquisition module is used for acquiring the current real-time temperature, the ambient temperature and the power battery SOC of the power battery.
The threshold calculation module is used for determining a power battery cooling starting temperature control threshold and a power battery heating starting temperature control threshold according to the power battery SOC and the ambient temperature.
The first judging module is used for judging whether the real-time temperature of the power battery is higher than the control threshold value of the cooling starting temperature of the power battery, if so, sending information to the first control module, and if not, sending information to the second judging module.
The first control module is used for controlling the opening of the cooling circulation loop, determining the cooling target temperature and the cooling liquid target temperature of the power battery according to the SOC and the ambient temperature of the power battery, and then determining the rotation rate of the air conditioner compressor and the flow rate of the cooling liquid of the cooling loop; and after the cooling target temperature of the power battery is reached, closing the loop and sending information to the second judging module.
And the second judging module is used for judging whether the real-time temperature of the power battery is lower than the heating start temperature control threshold value, if so, sending information to the second control module, and if not, ending.
The second control module is used for controlling the heating circulation loop to be opened, determining the heating target temperature of the power battery and the target temperature of the cooling liquid according to the SOC of the power battery and the ambient temperature, and determining the PTC power of the water heating and the flow rate of the cooling liquid of the heating loop; after the power battery heating target temperature is reached, the loop is closed.
The method and the system fully consider the difference of the target temperature setting of the cooling liquid under different working conditions, for example, the different target temperature setting of the cooling liquid according to the SOC (state of charge) of the power battery is considered in the power battery extrapolation charging process. The higher the SOC, the higher the coolant target temperature. If the SOC is more than or equal to 85%, the target temperature of the cooling liquid is set to be 30 ℃, otherwise, the target temperature of the cooling liquid is set to be 25 ℃. Meanwhile, the invention also considers the difference of the power battery heating target temperature setting under different working conditions, namely, when the power battery temperature is controlled to be more or less, the cooling/heating circulation loop is closed. For example, in the process of cooling the power battery, if the ambient temperature is 30 ℃, the target temperature of the power battery can be set to 35 ℃, that is, the target temperature of the power battery reaches 35 ℃, the cooling circulation loop can be closed, if the ambient temperature is 40 ℃, the target temperature of the power battery is also set to 35 ℃, after the cooling circulation loop is possibly closed, the temperature of the power battery rises rapidly due to high heat radiation, and the cooling circulation loop needs to be opened again because of high ambient temperature. To prevent the occurrence of a situation in which the cooling circulation circuit is turned on or off cyclically, the power cell target temperature may be set to 30 ℃ when the ambient temperature is 40 ℃ to reduce the power consumption.
According to the method, a cooling/heating starting temperature control threshold value of the power battery is determined according to the SOC of the power battery and the ambient temperature, whether the power battery is higher than or lower than the cooling/heating starting temperature control threshold value of the power battery is judged according to the real-time temperature of the power battery, if yes, a cooling/heating circulation loop is started, a cooling target temperature BatCoolTargetTemp/a heating target temperature BatHeatTagetTemp of the power battery and a cooling liquid target temperature CoolLiquirdTargetTemp are determined according to the SOC of the power battery and the ambient temperature, and then the rotating speed/water heating PTC power of an air conditioner compressor and the flow speed/flow speed of cooling liquid of the cooling loop are determined according to the cooling liquid target temperature CoolLiquirgetTemp of the power battery, so that the power battery is in an optimal working temperature range, and meanwhile, the energy consumption is effectively reduced.
In the foregoing specification, the gist of the present invention has been described by referring to specific embodiments. However, various modifications and changes can be made without departing from the gist of the present invention as set forth in the claims. The drawings described in the present specification are to be regarded as illustrative rather than restrictive. Accordingly, the scope of the gist of the present invention should be determined by the claims and their legal equivalents or entities, not by the examples described only. Any steps set forth in any method or process claims in this specification may be performed in any order or combination of orders and are not limited to the exemplary specific order set forth in the claims. The modules, units, systems recited in any apparatus claims may be combined, assembled, configured in any arrangement and are not limited to the specific composition, assembly, or configuration of the programs in the claims.
Claims (9)
1. An intelligent temperature control method for a power battery is characterized by comprising the following steps:
firstly, determining a power battery cooling/heating starting temperature control threshold according to the SOC of the power battery and the ambient temperature;
judging whether the temperature is higher than or lower than a power battery cooling/heating starting temperature control threshold according to the power battery real-time temperature, if so, starting a cooling/heating circulation loop, and determining a power battery cooling target temperature/power battery heating target temperature and a cooling liquid target temperature according to the power battery SOC and the environment temperature;
and finally, determining the rotating speed of the air conditioner compressor, the water heating PTC power, the flow rate of cooling liquid of the cooling circuit and the flow rate of cooling liquid of the heating circuit according to the cooling target temperature of the power battery, the heating target temperature of the power battery and the cooling liquid target temperature of the cooling circuit and the heating circuit.
2. The intelligent temperature control method of a power battery according to claim 1, comprising the steps of:
s1, acquiring the current real-time temperature, the environment temperature and the SOC of a power battery;
s2, determining a power battery cooling starting temperature control threshold value and a power battery heating starting temperature control threshold value according to the SOC of the power battery and the ambient temperature;
s3, judging whether the real-time temperature of the power battery is higher than a power battery cooling start temperature control threshold, if so, entering S4, and if not, entering S5;
s4, controlling the cooling circulation loop to be opened, determining the cooling target temperature and the cooling liquid target temperature of the power battery according to the SOC and the ambient temperature of the power battery, and then determining the rotation rate of the air conditioner compressor and the flow rate of the cooling liquid of the cooling loop; after reaching the cooling target temperature of the power battery, closing the loop, and entering S5;
s5, judging whether the real-time temperature of the power battery is lower than a heating start temperature control threshold, if so, entering a step 6, and if not, ending;
s6, controlling the heating circulation loop to be opened, determining the heating target temperature of the power battery and the target temperature of the cooling liquid according to the SOC of the power battery and the ambient temperature, and determining the PTC power of the water heating and the flow rate of the cooling liquid of the heating loop; after the target temperature of the power battery is reached, the loop is closed, and the process is finished.
3. The intelligent temperature control method of a power battery according to claim 2, wherein the step S4 specifically includes:
s41, controlling a cooling circulation loop to be opened;
s42, determining a cooling target temperature of the power battery and a cooling liquid target temperature according to the SOC of the power battery and the ambient temperature;
s43, determining the rotating speed of the air conditioner compressor and the flow rate of cooling liquid in a cooling circuit according to the target temperature of the cooling liquid;
s44, in the process of cooling the power battery, judging whether the real-time temperature of the power battery reaches the cooling target temperature of the power battery in real time; if yes, entering S45, otherwise jumping to S42, and continuing to cool the power battery;
and S45, controlling the cooling circulation loop to be closed.
4. The intelligent temperature control method of a power battery according to claim 2, wherein the step S6 specifically includes:
s61, controlling the heating circulation loop to be opened;
s62, determining a heating target temperature of the power battery and a cooling liquid target temperature according to the SOC of the power battery and the ambient temperature;
s63, determining the PTC power of the water heating and the flow rate of the cooling liquid of the heating circuit according to the target temperature of the cooling liquid of the heating circuit;
s64, in the process of heating the power battery, judging whether the real-time temperature of the power battery reaches the heating target temperature of the power battery in real time, if so, entering S65, otherwise, jumping to S62;
s65, controlling the heating circulation loop to be closed.
5. The intelligent temperature control system of the power battery is characterized by comprising the following modules:
the information acquisition module is used for acquiring the current real-time temperature, the environment temperature and the power battery SOC of the power battery;
the threshold calculation module is used for determining a power battery cooling starting temperature control threshold value and a power battery heating starting temperature control threshold value according to the power battery SOC and the environment temperature;
the first judging module is used for judging whether the real-time temperature of the power battery is higher than the control threshold value of the cooling starting temperature of the power battery, if so, sending information to the first control module, and if not, sending information to the second judging module;
the first control module is used for controlling the opening of the cooling circulation loop, determining the cooling target temperature and the cooling liquid target temperature of the power battery according to the SOC and the ambient temperature of the power battery, and then determining the rotation rate of the air conditioner compressor and the flow rate of the cooling liquid of the cooling loop; after reaching the cooling target temperature of the power battery, closing the loop and sending information to the second judging module;
the second judging module is used for judging whether the real-time temperature of the power battery is lower than a heating starting temperature control threshold value, if so, sending information to the second control module, and if not, ending;
the second control module is used for controlling the heating circulation loop to be opened, determining the heating target temperature of the power battery and the target temperature of the cooling liquid according to the SOC of the power battery and the ambient temperature, and determining the PTC power of the water heating and the flow rate of the cooling liquid of the heating loop; after the target temperature of the power battery is reached, the loop is closed, and the process is finished.
6. The intelligent temperature control system of a power battery according to claim 5, wherein the first control module specifically performs the following control:
s41, controlling a cooling circulation loop to be opened;
s42, determining a cooling target temperature of the power battery and a cooling liquid target temperature according to the SOC of the power battery and the ambient temperature;
s43, determining the rotating speed of the air conditioner compressor and the flow rate of cooling liquid in a cooling circuit according to the target temperature of the cooling liquid;
s44, in the process of cooling the power battery, judging whether the real-time temperature of the power battery reaches the cooling target temperature of the power battery in real time; if yes, entering S45, otherwise jumping to S42, and continuing to cool the power battery;
and S45, controlling the cooling circulation loop to be closed.
7. The intelligent temperature control system of a power battery according to claim 5, wherein the second control module specifically performs the following control:
s61, controlling the heating circulation loop to be opened;
s62, determining a heating target temperature of the power battery and a cooling liquid target temperature according to the SOC of the power battery and the ambient temperature;
s63, determining the PTC power of the water heating and the flow rate of the cooling liquid of the heating circuit according to the target temperature of the cooling liquid of the heating circuit;
s64, in the process of heating the power battery, judging whether the real-time temperature of the power battery reaches the heating target temperature of the power battery in real time, if so, entering S65, otherwise, jumping to S62;
s65, controlling the heating circulation loop to be closed.
8. A vehicle provided with a power cell intelligent temperature control system according to any one of claims 5-7.
9. A computer readable storage medium having stored thereon a computer program which when executed by a processor realizes the steps of the power cell intelligent temperature control method of any of claims 1 to 4.
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| US11872869B2 (en) * | 2021-08-26 | 2024-01-16 | Fca Us Llc | Systems and methods for ensuring drivability for battery electric vehicles during extreme cold weather conditions |
| CN114655080B (en) * | 2022-03-31 | 2023-05-23 | 重庆长安新能源汽车科技有限公司 | Battery heating control method and control system in running process of electric vehicle |
| CN115476733A (en) * | 2022-08-31 | 2022-12-16 | 阿维塔科技(重庆)有限公司 | Charging temperature control method and device for power battery |
| CN116292017B (en) * | 2023-05-19 | 2023-08-18 | 潍柴动力股份有限公司 | Heating method, device, equipment and system of methanol range extender engine |
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