CN113352944B - Method and system for determining thermal management parameters of power battery based on low-temperature quick charge - Google Patents
Method and system for determining thermal management parameters of power battery based on low-temperature quick charge Download PDFInfo
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- CN113352944B CN113352944B CN202110602771.8A CN202110602771A CN113352944B CN 113352944 B CN113352944 B CN 113352944B CN 202110602771 A CN202110602771 A CN 202110602771A CN 113352944 B CN113352944 B CN 113352944B
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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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- 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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Abstract
The invention discloses a method and a system for determining thermal management parameters of a power battery based on low-temperature quick charge, wherein the method for determining the thermal management parameters of the power battery comprises the following steps: at the initial charging time, if the lowest temperature of the battery system is less than Z1, obtaining the corresponding coolant inlet temperature X1 and inlet flow Y1 according to the environment temperature, the lowest temperature of the battery system and the SOC, and taking X1 and Y1 as a coolant inlet temperature request value and an inlet flow request value sent to a vehicle thermal management system; in the charging process, when the lowest temperature of the battery system is higher than Z2, the coolant inlet temperature X2 and the battery system temperature difference delta T are calculated, the coolant inlet flow Y2 is determined, and X2 and Y2 are used as a coolant inlet temperature request value and an inlet flow request value which are sent to a heat management system of the whole vehicle. The invention can shorten the quick charge time, reduce the quick charge temperature difference and ensure the logic correctness of the quick charge time of different initial SOC under the low-temperature working condition.
Description
Technical Field
The invention belongs to the field of power battery thermal management control of electric automobiles, and particularly relates to a method and a system for determining power battery thermal management parameters based on low-temperature quick charging.
Background
The new energy automobile takes a pure electric automobile as a main technical route, batteries of the new energy automobile mainly take a ternary lithium battery or a lithium iron phosphate battery as a main technical route, and the two batteries have the problems of overlong low-temperature quick charging time, overlarge temperature difference in the charging process, logic errors of different start and stop SOC quick charging times and the like under the low-temperature condition.
The current strategy for determining the thermal management parameters of the power battery (including the cooling liquid inlet temperature and the cooling liquid inlet flow rate) is as follows: the design is carried out in a mode of keeping the temperature of a cooling liquid inlet and the flow of the cooling liquid inlet unchanged at each stage of the charging of the power battery, or the temperature of the cooling liquid inlet and the flow of the cooling liquid inlet are simply increased or reduced at a certain stage of the charging of the power battery, the charging time and the temperature difference of a battery system can only be reduced in stages, and the reduction of the charging time and the temperature difference of the battery system in the whole charging process is difficult to ensure. The determination strategies of the thermal management parameters of the power battery mainly have the following problems:
(1) the lower temperature of the cooling liquid inlet water can cause the temperature rise rate of the battery system to be reduced, the charging time is prolonged, the higher temperature of the cooling liquid inlet water can cause unnecessary consumption of the battery system, the energy consumption of the whole vehicle is increased, and the use experience of a user is seriously influenced; (2) in a low-temperature environment, the time consumed by the vehicle to charge from the displayed lower starting SOC to full charge (i.e., the SOC reaches 100%) is shorter than the time consumed by the vehicle to charge from the displayed higher starting SOC to full charge (i.e., the SOC reaches 100%), which seriously affects the user experience; (3) when the battery module heating difference in power battery is great, can lead to because of local temperature crosses lowly to cause BMS (be battery management system promptly) to the charging power restriction of battery system, extension charge time to long-time difference in temperature problem still can lead to battery module local capacity decay fast, thereby causes whole packet of capacity decay fast, causes serious economic loss for the customer.
Disclosure of Invention
The invention aims to provide a method and a system for determining thermal management parameters of a power battery based on low-temperature quick charge, so that under a low-temperature working condition, the quick charge time is shortened, the quick charge temperature difference is reduced, and the logic correctness of the quick charge time of different initial SOC is ensured.
The invention discloses a method for determining thermal management parameters of a power battery based on low-temperature quick charging, which comprises the following steps:
step one, at the initial charging time, if the lowest temperature of the battery system is smaller than a preset first temperature threshold value Z1, inquiring a temperature-SOC-coolant inlet temperature flow meter according to the ambient temperature at the initial charging time, the lowest temperature of the battery system and the SOC to obtain a corresponding coolant inlet temperature X1 and a corresponding coolant inlet flow Y1, taking the coolant inlet temperature X1 as a coolant inlet temperature request value sent to the whole vehicle thermal management system, and taking the coolant inlet flow Y1 as a coolant inlet flow request value sent to the whole vehicle thermal management system until the lowest temperature of the battery system reaches a preset second temperature threshold value Z2. The temperature-SOC-cooling liquid inlet temperature flow meter is a corresponding relation meter of the stored ambient temperature at the charging starting moment, the lowest temperature of the battery system at the charging starting moment, the SOC at the charging starting moment, the cooling liquid inlet temperature and the cooling liquid inlet flow, which are obtained in a calibration mode; in the correspondence table, when the ambient temperature at the charge start time is the same and the lowest temperature of the battery system at the charge start time is the same, the coolant inlet temperature and the coolant inlet flow rate increase as the SOC at the charge start time increases. The lowest temperature of the battery system refers to the minimum value of all battery module temperatures of the power battery. The process that the lowest temperature of the battery system rises from a first temperature threshold Z1 smaller than the preset first temperature threshold Z2 is a temperature rising stage, in the temperature rising stage, the BMS requests the whole vehicle thermal management system to control the inlet temperature of the cooling liquid to be X1 and control the inlet flow of the cooling liquid to be Y1, and the lowest temperature of the battery system is guaranteed to reach the second temperature threshold Z2 in the appointed time.
Step two, in the charging process, when the lowest temperature of the battery system is greater than a preset second temperature threshold value Z2, utilizing a formula: x2= (T)min+Tmax) (ii)/2, calculating the coolant inlet temperature X2 using the formula: Δ T = Tmax -TminCalculating the temperature difference Delta T of the battery system and determining the following batteryThe cooling liquid inlet flow Y2 is increased when the system temperature difference delta T is increased, the cooling liquid inlet temperature X2 is used as a cooling liquid inlet temperature request value sent to the whole vehicle thermal management system, and the cooling liquid inlet flow Y2 is used as a cooling liquid inlet flow request value sent to the whole vehicle thermal management system until the highest temperature of the battery system reaches a preset third temperature threshold Z3; wherein, TminIs the lowest temperature, T, of the current battery systemmaxIs the highest temperature of the current battery system. The maximum temperature of the battery system refers to the maximum value among all battery module temperatures of the power battery. When the lowest temperature of the battery system reaches a preset second temperature threshold value Z2, the battery finishes the temperature rising stage, then the battery enters the quick charging stage, the BMS requests the whole vehicle thermal management system to control the inlet temperature of the cooling liquid to be X2 and control the inlet flow of the cooling liquid to be Y2, the temperature of the battery system is guaranteed to be maintained in the quick charging interval all the time, at the moment, the charging current of the battery is large, and the temperature of the battery system rises quickly.
Preferably, the method for determining the thermal management parameters of the power battery further includes:
and step three, in the charging process, when the highest temperature of the battery system is greater than a preset third temperature threshold value Z3, taking the current ambient temperature X4 as a lower limit request value of a coolant inlet temperature range sent to the whole vehicle thermal management system, taking the preset coolant inlet temperature X3 as an upper limit request value of the coolant inlet temperature range sent to the whole vehicle thermal management system, and taking the preset coolant inlet flow Y3 as a coolant inlet flow request value sent to the whole vehicle thermal management system until charging is completed. When the highest temperature of the battery system reaches a preset third temperature threshold value Z3, the battery finishes the quick charging stage, and then enters the temperature equalizing stage, the BMS requests the whole vehicle thermal management system to control the temperature of the cooling liquid inlet to be maintained between the current ambient temperature X4 and the preset temperature X3 of the cooling liquid inlet, the flow of the cooling liquid inlet is controlled to be Y3, low-energy-consumption circulation work (the cooling liquid keeps circulating flow) of the whole vehicle thermal management system is guaranteed, at the moment, the charging current of the battery is small, the temperature of the battery system rises slowly, and the charging is finished until the charging is finished.
The system for determining the thermal management parameters of the power battery based on low-temperature quick charging comprises a battery management system (namely BMS), wherein the battery management system is programmed to execute the method for determining the thermal management parameters of the power battery.
The invention has the following effects:
(1) in the temperature rise stage, the coolant inlet temperature is kept at X1, the coolant inlet flow rate is kept at Y1, and in the case that the ambient temperature at the charging start time is the same and the lowest temperature of the battery system is the same, X1 and Y1 increase with the increase of SOC at the charging start time; therefore, the time consumed when the vehicle starts to be charged to be full from the higher initial SOC is shorter than the time consumed when the vehicle starts to be charged to be full from the lower initial SOC, the cognition of a user is met, and the logic correctness of the quick charging time of different initial SOCs is ensured.
(2) The strategy for determining the thermal management parameters for increasing the temperature of the coolant inlet and the flow of the coolant inlet along with the increase of the SOC at the initial charging time does not obviously increase the energy consumption caused by heating in the charging process, but reduces the energy consumption caused by thermal management of the battery because the heating time is short.
(3) In the quick charging stage, the coolant inlet temperature request value and the coolant inlet flow request value are determined according to the lowest temperature and the highest temperature of the battery system, the temperature of the battery system is guaranteed to be always maintained in a quick charging interval, the temperature of the battery system rises quickly, and the problems of charging power limitation, prolonged charging time and quick capacity attenuation caused by overlarge temperature difference of the battery system are solved.
(4) The effect of keeping the cooling liquid circulation in the temperature equalizing stage on improving the consistency of the battery temperature is obvious, and in the charging process in the stage, the temperature difference of the battery system for keeping the cooling liquid circulation is smaller than that of the battery system for directly closing the cooling liquid circulation.
Drawings
Fig. 1 is a flowchart of a method for determining thermal management parameters of a power battery based on low-temperature fast charging in this embodiment.
Detailed Description
As shown in fig. 1, the method for determining the thermal management parameter of the power battery based on low-temperature fast charge in the present embodiment is executed by a battery management system (i.e., BMS), and the method for determining includes:
the method comprises the steps of firstly, judging whether the lowest temperature of a battery system at the charging starting moment is smaller than a preset first temperature threshold value Z1, if so, executing the second step, and if not, finishing.
Secondly, inquiring a temperature-SOC-cooling liquid inlet temperature flow meter according to the ambient temperature of the charging starting moment, the lowest temperature of the battery system of the charging starting moment and the SOC of the charging starting moment to obtain the corresponding cooling liquid inlet temperature X1 and the corresponding cooling liquid inlet flow Y1, and then executing the third step. The temperature-SOC-cooling liquid inlet temperature flow meter is a corresponding relation meter of the stored ambient temperature at the charging starting moment, the lowest temperature of the battery system at the charging starting moment, the SOC at the charging starting moment, the cooling liquid inlet temperature and the cooling liquid inlet flow, which are obtained in a calibration mode. In the correspondence table, when the ambient temperature at the charge start time is the same and the lowest temperature of the battery system at the charge start time is the same, the coolant inlet temperature and the coolant inlet flow rate increase as the SOC at the charge start time increases. The coolant inlet temperature and the coolant inlet flow in the correspondence table can ensure that the minimum temperature of the battery system reaches a preset second temperature threshold value Z2 within a specified time. The calibration mode of the temperature-SOC-cooling liquid inlet temperature flow meter belongs to the prior art.
And thirdly, taking the coolant inlet temperature X1 as a coolant inlet temperature request value sent to the whole vehicle thermal management system, taking the coolant inlet flow Y1 as a coolant inlet flow request value sent to the whole vehicle thermal management system, and then executing the fourth step.
And fourthly, judging whether the lowest temperature of the battery system is greater than a preset second temperature threshold value Z2, if so, executing the fifth step, otherwise, returning to execute the third step. Wherein the preset second temperature threshold Z2 is greater than the preset first temperature threshold Z1.
Fifthly, using a formula: x2= (T)min+Tmax) (ii)/2, calculating the coolant inlet temperature X2 using the formula: Δ T = Tmax-TminCalculating the temperature difference Delta T of the battery system, anddetermining the cooling liquid inlet flow rate Y2 which increases with the increase of the temperature difference Delta T of the battery system, and then executing the sixth step; wherein, TminIs the lowest temperature, T, of the current battery systemmaxIs the highest temperature of the current battery system.
And sixthly, taking the coolant inlet temperature X2 as a coolant inlet temperature request value sent to the whole vehicle thermal management system, taking the coolant inlet flow Y2 as a coolant inlet flow request value sent to the whole vehicle thermal management system, and then executing the seventh step.
And seventhly, judging whether the highest temperature of the battery system is larger than a preset third temperature threshold Z3, if so, executing the eighth step, and if not, returning to execute the fifth step. Wherein the preset third temperature threshold Z3 is greater than the preset second temperature threshold Z2.
And step eight, judging whether the SOC at the current moment reaches the charging target SOC, if so, ending (indicating that charging is finished), otherwise, executing the step nine.
And a ninth step of taking the current ambient temperature X4 as a lower limit request value of a coolant inlet temperature range sent to the whole vehicle thermal management system, taking the preset coolant inlet temperature X3 as an upper limit request value of the coolant inlet temperature range sent to the whole vehicle thermal management system, taking the preset coolant inlet flow Y3 as a coolant inlet flow request value sent to the whole vehicle thermal management system, and then returning to execute the eighth step.
The embodiment also provides a system for determining the thermal management parameters of the power battery based on low-temperature quick charging, which comprises a battery management system, wherein the battery management system is programmed to execute the method for determining the thermal management parameters of the power battery.
Claims (3)
1. A method for determining thermal management parameters of a power battery based on low-temperature quick charging is characterized by comprising the following steps:
step one, at the initial charging time, if the lowest temperature of a battery system is smaller than a preset first temperature threshold value Z1, inquiring a temperature-SOC-coolant inlet temperature flow meter according to the ambient temperature at the initial charging time, the lowest temperature of the battery system and the SOC to obtain a corresponding coolant inlet temperature X1 and a corresponding coolant inlet flow Y1, taking the coolant inlet temperature X1 as a coolant inlet temperature request value sent to a whole vehicle thermal management system, and taking the coolant inlet flow Y1 as a coolant inlet flow request value sent to the whole vehicle thermal management system until the lowest temperature of the battery system reaches a preset second temperature threshold value Z2; the temperature-SOC-cooling liquid inlet temperature flow meter is a corresponding relation meter of the stored ambient temperature at the charging starting moment, the lowest temperature of the battery system, the SOC, the cooling liquid inlet temperature and the cooling liquid inlet flow, which are obtained in a calibration mode; in the correspondence table, under the condition that the ambient temperature at the charging start time is the same and the lowest temperature of the battery system is the same, the coolant inlet temperature and the coolant inlet flow rate increase with the increase of the SOC at the charging start time;
step two, in the charging process, when the lowest temperature of the battery system is greater than a preset second temperature threshold value Z2, utilizing a formula: x2= (T)min+Tmax) (ii)/2, calculating the coolant inlet temperature X2 using the formula: Δ T = Tmax -TminCalculating a temperature difference delta T of the battery system, determining a coolant inlet flow Y2 which is increased along with the increase of the temperature difference delta T of the battery system, taking the coolant inlet temperature X2 as a coolant inlet temperature request value sent to the whole vehicle thermal management system, and taking the coolant inlet flow Y2 as a coolant inlet flow request value sent to the whole vehicle thermal management system until the highest temperature of the battery system reaches a preset third temperature threshold Z3; wherein, TminIs the lowest temperature, T, of the current battery systemmaxIs the highest temperature of the current battery system.
2. The method for determining the thermal management parameters of the power battery based on the low-temperature quick charge is characterized by further comprising the following steps:
and step three, in the charging process, when the highest temperature of the battery system is greater than a preset third temperature threshold value Z3, taking the current ambient temperature X4 as a lower limit request value of a coolant inlet temperature range sent to the whole vehicle thermal management system, taking the preset coolant inlet temperature X3 as an upper limit request value of the coolant inlet temperature range sent to the whole vehicle thermal management system, and taking the preset coolant inlet flow Y3 as a coolant inlet flow request value sent to the whole vehicle thermal management system until charging is completed.
3. The utility model provides a power battery thermal management parameter's determination system based on low temperature is filled soon, includes battery management system, its characterized in that: the battery management system is programmed to perform the determination method as claimed in claim 1 or 2.
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| CN114435190B (en) * | 2021-12-28 | 2023-05-23 | 重庆长安新能源汽车科技有限公司 | Battery thermal management control method, system, vehicle and storage medium |
| CN115051442B (en) * | 2022-06-30 | 2024-01-30 | 广州巨湾技研有限公司 | Method and system for controlling battery fast charge current according to temperature |
| CN117074977B (en) * | 2023-10-10 | 2023-12-22 | 中汽研（天津）汽车工程研究院有限公司 | Automatic test method and system for simulating performance of real vehicle battery pack |
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