CN109244600A - A kind of control method of power battery thermal management system - Google Patents
A kind of control method of power battery thermal management system Download PDFInfo
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- CN109244600A CN109244600A CN201810984556.7A CN201810984556A CN109244600A CN 109244600 A CN109244600 A CN 109244600A CN 201810984556 A CN201810984556 A CN 201810984556A CN 109244600 A CN109244600 A CN 109244600A
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- management system
- thermal management
- power battery
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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
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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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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of control methods of power battery thermal management system, by in the opening and closing condition of power battery thermal management system, increase the assessment and calculating of heat consumption trend, by the original mode passively controlled according only to battery temperature T, become the mode for actively assessing power battery applying working condition in advance, battery thermal management can be carried out more efficient and energy savingly, ensure that the operation of heat management system will not excessively lag the variation of battery temperature T, it is ensured that battery-efficient rate, long-life operation.
Description
Technical field
The present invention relates to power battery thermal management technology field, especially a kind of controlling party of power battery thermal management system
Method.
Background technique
Power source of the power battery as electric car, has biggish capacity and output power.Power battery is big
When multiplying power and extreme environment are run, it will generate a large amount of heat.If heat cannot shed in time, the temperature of battery will
It rises rapidly, excessively high temperature will will lead to cycle life decline, the chemical property slump of disastrous proportions of battery, or even will appear
Safety issues such as " thermal runaways ".Therefore, using reasonable heat management system and control method to the circulation for improving power battery
Service life and safety are essential.
Currently, the control method that most of heat management systems use all is passive control mode, when temperature of powered cell T is big
Heat management system is opened when start-up temperature T1, heat management system is closed when temperature of powered cell T is lower than closing temperature T2, does not have
Have and the heat consumption trend of power battery is assessed, the operation of heat management system lags behind the temperature change of power battery, causes
Energy waste or even temperature of powered cell T cannot influence battery operation efficiency and longevity continually and steadily within the scope of suitable temperature
Life.
Summary of the invention
To solve the above problems, the purpose of the present invention is to provide a kind of control method of power battery thermal management system,
The operating condition for sufficiently combining power battery becomes passive control as active control, it is ensured that battery-efficient rate, long-life operation.
Technical solution used by the present invention solves the problems, such as it is:
A kind of control method of power battery thermal management system, comprising:
Detect the battery temperature T of power accumulator；
Calculate the heat consumption trend of the power accumulator under Current Temperatures；
The operation of power battery thermal management system is controlled according to the battery temperature T of power accumulator and heat consumption trend
System.
Further, the control method of the power battery thermal management system, the battery temperature T according to power accumulator
The operation of power battery thermal management system is controlled with heat consumption trend, comprising:
When battery temperature T is greater than start-up temperature T1, water pump is opened；
When heat consumption trend is in upward status, opens solenoid valve and compressor；
When battery temperature T lower than closing temperature T2 or when heat consumption trend be in decline state when, close compressor, solenoid valve
And water pump.
Further, the heat consumption trend for calculating the power accumulator under Current Temperatures, including calculate current calorific value QIt is real
With natural heat dissipation amount QFrom；
The current calorific value QIt is realGreater than natural heat dissipation amount QFromWhen, heat consumption trend is in upward status；
The current calorific value QIt is realLess than natural heat dissipation amount QFromWhen, heat consumption trend is at decline state.
Further, the control method of the power battery thermal management system is calculated by the following formula current calorific value QIt is real:
QIt is real=K [(I1+I2+ ...+IN)/N]2(R1+R2+…+RN)
Wherein, K is weighting coefficient；I1, I2 ..., IN are the battery current extracted at N number of time point；R1, R2 ..., RN be with
I1, I2 ..., the battery internal resistance data that IN is extracted with the period.
Further, the control method of the power battery thermal management system is calculated by the following formula natural heat dissipation amount QFrom:
QFrom=λ △ t1；
λ=2.51C (T0/L) ^0.25；
△ t1=T-T0；
Wherein, λ is convection transfer rate, unit W/m2·℃；T is battery temperature, and unit is DEG C；T0 is Air Temperature
Degree, unit are DEG C；△ t1 is the difference of battery temperature T and air themperature T0, and unit is DEG C；C is coefficient；L is convection current heat transfer
Conductor length, unit m.
Further, after the control method of the power battery thermal management system, solenoid valve and compressor are opened, further includes:
Cooling ratio α after calculating power battery thermal management system opens solenoid valve and compressor, according to the cooling system
Number α adjusts the flow of the water pump.
Further, the control method of the power battery thermal management system passes through following formula meter
Calculate cooling ratio α:
QHeat=Cp*M* △ t2；
α=QHeat/QIt is real；
Wherein, Cp is coolant liquid specific heat capacity, and unit is J/ (kg DEG C)；M is coolant liquid quality, unit Kg；△ t2 is cold
But liquid out temperature is poor, and unit is DEG C.
Further, the control method of the power battery thermal management system further includes detection water pump before the water pump is opened
State, water pump state open water pump when normal；Dependent failure information is reported when fault of water pump.
Further, before the control method of the power battery thermal management system, the solenoid valve and compressor are opened, currently
Calorific value QIt is realLess than or equal to natural heat dissipation amount QFromWhen, wouldn't opens solenoid valve and compressor, and report delay open phase
Close information.
Further, the control method of the power battery thermal management system, after the compressor, solenoid valve and water pump are closed
Report related closing information.
The beneficial effects of the present invention are: a kind of control method for power battery thermal management system that the present invention uses, passes through
In the opening and closing condition of power battery thermal management system, increase the assessment and calculating of heat consumption trend, by original only root
According to the mode that battery temperature T is passively controlled, become the mode for actively assessing power battery applying working condition in advance, it can be more
Effectively and energy savingly carry out battery thermal management, it is ensured that the operation of heat management system will not excessively lag the variation of battery temperature T, really
Protect battery-efficient rate, long-life operation.
Detailed description of the invention
The invention will be further described with example with reference to the accompanying drawing.
Fig. 1 is a kind of schematic diagram of power battery thermal management system of the present invention；
Fig. 2 is a kind of flow chart of the control method of power battery thermal management system of the present invention.
Specific embodiment
Referring to Fig.1, a kind of power battery thermal management system, including heat exchanger 33, water pump 32, expansion tank 31, power store
Battery 10, heater 34, solenoid valve 35, compressor 21, condenser 22 and evaporator 23, the heat exchanger 33 include first passage
And second channel, the compressor 21, condenser 22, evaporator 23, solenoid valve 35 and first passage are connected by refrigerant pipe 201
It connects to form refrigerant circulation circuit, the expansion tank 31, water pump 32, second channel, heater 34 and power accumulator 10 pass through
The connection of coolant duct 301 forms coolant liquid circulation loop.
Referring to Fig. 2, a kind of control method of power battery thermal management system of the invention, comprising the following steps:
Step S1: the battery temperature T of detection power accumulator 10 detects water when battery temperature T is greater than start-up temperature T1
32 states are pumped, water pump 32 is opened when 32 state of water pump is normal；
Step S2: current calorific value Q is calculatedIt is realWith natural heat dissipation amount QFromAnd it is compared, current calorific value QIt is realGreater than nature
Heat dissipation capacity QFromWhen, opens solenoid valve 35 and compressor 21；
Step S3: battery temperature T is lower than closing temperature T2 or current calorific value QIt is realLess than natural heat dissipation amount QFromWhen, it closes
Compressor 21, solenoid valve 35 and water pump 32.
This method is by the opening and closing condition of power battery thermal management system, increasing current calorific value QIt is realWith oneself
Right heat dissipation capacity QFromCalculating and be compared, by the original mode passively controlled according only to battery temperature T, become actively
The mode for assessing power battery applying working condition in advance, can carry out battery thermal management, it is ensured that heat management more efficient and energy savingly
The operation of system will not excessively lag the variation of battery temperature T, it is ensured that battery-efficient rate, long-life operation.
Specifically, in the step S2, current calorific value Q is calculatedIt is realMethod it is as follows:
Power accumulator 10 generates three kinds of heat in charge and discharge process: Joule heat, polarization heat and reaction heat, three kinds of heat production with
Joule heat be it is main, wherein the battery current of power accumulator and the internal resistance of cell carry out in real time in power battery thermal management system
Detection, feedback time is required according to power battery thermal management system, for the current calorific value Q of power accumulator 10It is realBy one section
Or multistage feedback time average cell electric current and the average internal resistance of cell are calculated:
QIt is real=K [(I1+I2+ ...+IN)/N]2(R1+R2+…+RN)
Wherein, K is weighting coefficient, is mended according to the actual situation to the assessment for using polarize in battery heat and reaction heat
It repays, which is table look-up parameter and polarization heat and the same coke of reaction heat under different temperatures, charge-discharge magnification, difference SOC state
The ratio having burning ears；I1, I2 ..., IN are the battery current extracted at N number of time point；R1, R2 ..., RN is and I1, I2 ..., IN are same
The battery internal resistance data that period extracts.
Specifically, in the step S3, natural heat dissipation amount Q is calculatedFromMethod are as follows:
QFrom=λ △ t1；
λ=2.51C (T0/L) ^0.25；
△ t1=T-T0；
Wherein, λ is convection transfer rate, unit W/m2·℃；T is battery temperature, and unit is DEG C；T0 is Air Temperature
Degree, unit are DEG C；△ t1 is the difference of battery temperature T and air themperature T0, and unit is DEG C；C is coefficient；L is convection current heat transfer
Conductor length, unit m；The selection of C and L can refer to following example of parameters:
A kind of another embodiment of the control method of power battery thermal management system of the invention, comprising the following steps:
Step S1: the battery temperature T of detection power accumulator 10 detects water when battery temperature T is greater than start-up temperature T1
32 states are pumped, water pump 32 is opened when 32 state of water pump is normal；
Step S2: current calorific value Q is calculatedIt is realWith natural heat dissipation amount QFromAnd it is compared, current calorific value QIt is realGreater than nature
Heat dissipation capacity QFromWhen, opens solenoid valve 35 and compressor 21；
Step S21: the cooling ratio α after calculating power battery thermal management system opens solenoid valve 35 and compressor 21, root
The flow of the water pump 32 is adjusted according to the cooling ratio α；
Step S3: battery temperature T is lower than closing temperature T2 or current calorific value QIt is realLess than natural heat dissipation amount QFromWhen, it closes
Compressor 21, solenoid valve 35 and water pump 32.
Specifically, the method for cooling ratio α is calculated in the step S21 are as follows:
First calculate the cooling capacity of power battery thermal management system: QHeat=Cp*M* △ t2；Wherein, Cp is coolant liquid specific heat
Hold, unit is J/ (kg DEG C)；M is coolant liquid quality, unit Kg；△ t2 is that coolant liquid out temperature is poor, and unit is DEG C；
Cooling ratio α=Q of power battery thermal management system is calculated againHeat/QIt is real, for indicating current lowering ability.
When current lowering ability is too strong, will lead to power accumulator 10 temperature rapidly drop to closing temperature T2 with
Under, it is then shut off power battery thermal management system, the temperature of power accumulator 10 needs to reopen power battery again after rising
Heat management system causes power battery thermal management system constantly to open and close, and influences service life, the temperature of power accumulator 10
Degree is also not sufficiently stable, and is needed to reduce the flow of water pump 32 at this time according to cooling ratio α, is avoided power battery thermal management system not
Disconnected start and stop guarantee that the constant temperature of power accumulator 10 is stablized in a certain range；When current lowering ability can provide
When the temperature of power accumulator 10 lowering in the time, then the flow for increasing or reducing water pump 32 is not needed；Conversely, working as mesh
When preceding lowering ability can not at the appointed time lower the temperature of power accumulator 10, then increase the stream of water pump 32
Amount.
A kind of another embodiment of the control method of power battery thermal management system of the invention, comprising the following steps:
Step S1: the battery temperature T of detection power accumulator 10 detects water when battery temperature T is greater than start-up temperature T1
32 states are pumped, water pump 32 is opened when 32 state of water pump is normal；Dependent failure information is reported when 32 failure of water pump；
Step S2: current calorific value Q is calculatedIt is realWith natural heat dissipation amount QFromAnd it is compared, current calorific value QIt is realGreater than nature
Heat dissipation capacity QFromWhen, opens solenoid valve 35 and compressor 21；Current calorific value QIt is realLess than or equal to natural heat dissipation amount QFromWhen, it wouldn't
Opens solenoid valve 35 and compressor 21, and the relevant information for reporting delay to open.
Step S21: the cooling ratio α after calculating power battery thermal management system opens solenoid valve 35 and compressor 21, root
The flow of the water pump 32 is adjusted according to the cooling ratio α；
Step S3: battery temperature T is lower than closing temperature T2 or current calorific value QIt is realLess than natural heat dissipation amount QFromWhen, it closes
Compressor 21, solenoid valve 35 and water pump 32, report related closing information.
The above, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as
It reaches technical effect of the invention with identical means, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of control method of power battery thermal management system characterized by comprising
Detect the battery temperature T of power accumulator；
Calculate the heat consumption trend of the power accumulator under Current Temperatures；
The operation of power battery thermal management system is controlled according to the battery temperature T of power accumulator and heat consumption trend.
2. a kind of control method of power battery thermal management system according to claim 1, which is characterized in that the basis
The battery temperature T and heat consumption trend of power accumulator carry out control to the operation of power battery thermal management system and include:
When battery temperature T is greater than start-up temperature T1, water pump is opened；
When heat consumption trend is in upward status, opens solenoid valve and compressor；
When battery temperature T lower than closing temperature T2 or when heat consumption trend be in decline state when, close compressor, solenoid valve and water
Pump.
3. a kind of control method of power battery thermal management system according to claim 2, which is characterized in that
The heat consumption trend of power accumulator under the calculating Current Temperatures, including calculate current calorific value QIt is realWith natural heat dissipation amount
QFrom；
The current calorific value QIt is realGreater than natural heat dissipation amount QFromWhen, heat consumption trend is in upward status；
The current calorific value QIt is realLess than natural heat dissipation amount QFromWhen, heat consumption trend is at decline state.
4. a kind of control method of power battery thermal management system according to claim 3, which is characterized in that by following
Formula calculates current calorific value QIt is real:
QIt is real=K [(I1+I2+ ...+IN)/N]2(R1+R2+…+RN)
Wherein, K is weighting coefficient；I1, I2 ..., IN are the battery current extracted at N number of time point；R1, R2 ..., RN be and I1,
The battery internal resistance data that I2 ..., IN are extracted with the period.
5. a kind of control method of power battery thermal management system according to claim 4, which is characterized in that by following
Formula calculates natural heat dissipation amount QFrom:
QFrom=λ △ t1；
λ=2.51C (T0/L) ^0.25；
△ t1=T-T0；
Wherein, λ is convection transfer rate, unit W/m2·℃；T is battery temperature, and unit is DEG C；T0 is air themperature, unit
For DEG C；△ t1 is the difference of battery temperature T and air themperature T0, and unit is DEG C；C is coefficient；L is that the conductor of convection current heat transfer is long
Degree, unit m.
6. a kind of control method of power battery thermal management system according to claim 3, which is characterized in that the electromagnetism
After valve and compressor are opened, further includes:
Cooling ratio α after calculating power battery thermal management system opens solenoid valve and compressor, according to the cooling ratio α tune
Save the flow of the water pump.
7. a kind of control method of power battery thermal management system according to claim 6, which is characterized in that by following
Formula calculates cooling ratio α:
QHeat=Cp*M* △ t2；
α=QHeat/QIt is real；
Wherein, Cp is coolant liquid specific heat capacity, and unit is J/ (kg DEG C)；M is coolant liquid quality, unit Kg；△ t2 is coolant liquid
Out temperature is poor, and unit is DEG C.
8. a kind of control method of power battery thermal management system according to claim 2, which is characterized in that the water pump
It further include detection water pump state before unlatching, water pump state opens water pump when normal；Dependent failure information is reported when fault of water pump.
9. a kind of control method of power battery thermal management system according to claim 3, which is characterized in that the electromagnetism
Before valve and compressor are opened, current calorific value QIt is realLess than or equal to natural heat dissipation amount QFromWhen, it wouldn't opens solenoid valve and compression
Machine, and the relevant information for reporting delay to open.
10. a kind of control method of power battery thermal management system according to claim 2, which is characterized in that the pressure
It contracts after mechanical, electrical magnet valve is closed to water pump and reports related closing information.
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| CN112440654A (en) * | 2019-08-29 | 2021-03-05 | 比亚迪股份有限公司 | Thermal management system, control method thereof and vehicle with thermal management system |
| US20220367931A1 (en) * | 2021-05-14 | 2022-11-17 | Calb Co., Ltd. | Power supply system, control method of power supply system and control device of power suppy system |
| CN115626088A (en) * | 2022-09-20 | 2023-01-20 | 重庆长安汽车股份有限公司 | Heat management control method and device for rechargeable battery pack and storage medium |
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Address after: 529040 No. 336 Qinglan Road, Jianghai High-tech Development Zone, Jiangmen City, Guangdong Province Applicant after: Hanyu Group Co., Ltd. Address before: 529040 No. 336 Qinglan Road, Jianghai High-tech Development Zone, Jiangmen City, Guangdong Province Applicant before: Jiangmen Idear-hanyu Electrical Joint-stock Co., Ltd. |
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