CN114725565B - Lithium-ion battery high-temperature fast-charging cooling method, device, equipment and storage medium - Google Patents
Lithium-ion battery high-temperature fast-charging cooling method, device, equipment and storage medium Download PDFInfo
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- CN114725565B CN114725565B CN202210324254.3A CN202210324254A CN114725565B CN 114725565 B CN114725565 B CN 114725565B CN 202210324254 A CN202210324254 A CN 202210324254A CN 114725565 B CN114725565 B CN 114725565B
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- 238000001816 cooling Methods 0.000 title claims abstract description 242
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000004590 computer program Methods 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims 2
- 230000008569 process Effects 0.000 abstract description 23
- 238000010586 diagram Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Secondary Cells (AREA)
- Automation & Control Theory (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to a method, a device, equipment and a storage medium for cooling a lithium ion battery at high temperature in a quick-charge manner. The method comprises the steps of obtaining a capacity attenuation value of a battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold, adjusting a first allowable temperature of the battery system according to a comparison result to obtain a second allowable temperature of the battery system, obtaining a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at a first moment, obtaining a second temperature of the battery system at a second moment according to the charging curve and the first temperature, comparing the second temperature with the second allowable temperature, obtaining a cooling strategy according to a comparison result, obtaining a cooling duration according to the cooling strategy and the heat value between the battery system and a charging environment, and cooling the battery system according to the cooling duration, so that the problem of poor cooling performance in the charging process of a lithium ion battery can be solved.
Description
Technical Field
The invention relates to the technical field of heat management of power batteries of new energy automobiles, in particular to a method, a device, equipment and a storage medium for high-temperature quick-charge cooling of a lithium ion battery.
Background
With the continuous development of battery technology and the continuous attention paid to energy and environmental protection in the world, the new energy automobile industry is rapidly developed. The lithium ion battery is used as a power source of the new energy automobile, belongs to an important component of the new energy automobile, and the performance of the lithium ion battery directly influences the use of the electric automobile. Among all the environmental factors, the temperature has the greatest influence on the charge and discharge performance of the lithium ion battery, and although the operating temperature of the lithium ion battery ranges from-20 ℃ to 45 ℃, when the operating temperature is higher than 40 ℃, the performance, capacity and service life of the lithium ion battery are affected, a greater safety risk is increased, and the charge and discharge capability is weakened. At present, a cooling system can be arranged on a power battery, the battery is firstly subjected to cooling treatment and is forbidden to be charged in a high-temperature charging stage through a liquid cooling circulation system, and the battery is started to be charged after the temperature of the battery system is reduced. However, the life cycle of the battery system is not considered in the method, and as the battery system ages, the increase of the internal resistance of the battery may enhance the influence of high temperature on the battery, so that the high temperature battery system cannot be cooled in time.
Disclosure of Invention
Based on the above, it is necessary to provide a method, a device, an apparatus and a storage medium for cooling a lithium ion battery at high temperature and fast charge, so as to solve the problem of poor cooling performance in the charging process of the lithium ion battery.
In one aspect, a method for cooling a lithium ion battery by high-temperature fast charging is provided, the method for cooling the lithium ion battery by high-temperature fast charging includes:
Acquiring a capacity attenuation value of a battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold, and adjusting a first allowable temperature of the battery system according to a comparison result to acquire a second allowable temperature of the battery system;
Acquiring a charging curve from a first Charge State to a second Charge State according to a first temperature and a first Charge State (SOC) Of the battery system at a first moment; acquiring a second temperature Of the battery system at a second moment according to the charging curve and the first temperature; comparing the second temperature with the second allowable temperature, and acquiring a cooling strategy according to a comparison result;
And obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
In one embodiment, the step of obtaining a second temperature of the battery system at a second time according to the charging curve and the first temperature includes:
Acquiring the charging current of the battery system at the second moment according to the charging curve;
And acquiring the second temperature of the battery system at the second moment according to the charging current and the basic attribute of the battery system, wherein the basic attribute of the battery system comprises an internal resistance value of the battery system, a specific heat value of the battery system and a mass quantity of the battery system.
In one embodiment, the step of comparing the second temperature with the second allowable temperature and obtaining the cooling strategy according to the comparison result includes:
judging whether the second temperature is greater than the second allowable temperature;
If yes, a first cooling strategy is obtained;
If not, a second cooling strategy is acquired, and a second temperature of the battery system at a third moment is acquired.
In one embodiment, the step of obtaining a cooling strategy further comprises:
judging whether the second temperature is greater than the second allowable temperature;
If yes, a first cooling strategy is obtained;
If not, a second cooling strategy is obtained.
In one embodiment, the step of obtaining the cooling duration according to the cooling strategy and the heat value between the battery system and the charging environment comprises:
judging whether the cooling strategy is a first cooling strategy or not;
If yes, acquiring a heat value generated in the period from the first charge state to the second charge state, and acquiring a heat value generated in the period from the first temperature to the second temperature, wherein the heat value comprises a heating value of the battery system and a heat exchange value between the battery system and the charging environment, and acquiring the cooling duration t_cool according to the heat value and cooling power, wherein the mathematical expression is as follows:
t_cool=[(Q1-Q2)-(Q3-Q4)]/P
Wherein Q1 and Q3 represent the heating value, Q2 and Q4 represent the heat exchange value, and P represents the cooling power.
In one embodiment, the step of comparing the capacity fade value with a preset capacity fade threshold, adjusting the first allowable temperature of the battery system according to the comparison result, and obtaining the second allowable temperature of the battery system includes:
Judging whether the capacity attenuation value is larger than or equal to the capacity attenuation threshold value or not;
If yes, subtracting a preset temperature difference value from the first allowable temperature to obtain the second allowable temperature;
if not, the first allowable temperature is set as the second allowable temperature.
In one embodiment, the step of cooling the battery system according to the cooling time period includes:
And subtracting the cooling time from the time value corresponding to the second charge state to obtain a cooling start time, and cooling the battery system when the charging time reaches the cooling start time.
On the other hand, provided is a lithium ion battery high temperature fast charge cooling device, lithium ion battery high temperature fast charge cooling device includes:
The maximum temperature adjustment module is used for obtaining a capacity attenuation value of the battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold value, and adjusting the first allowable temperature of the battery system according to a comparison result to obtain a second allowable temperature of the battery system;
The system comprises a cooling strategy acquisition module, a cooling strategy acquisition module and a control module, wherein the cooling strategy acquisition module is used for acquiring a charging curve from a first charge state to a second charge state according to a first temperature of the battery system at a first moment and the first charge state;
And the cooling module is used for obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
In yet another aspect, a computer device is provided comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of:
Acquiring a capacity attenuation value of a battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold, and adjusting a first allowable temperature of the battery system according to a comparison result to acquire a second allowable temperature of the battery system;
Acquiring a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at the first moment; acquiring a second temperature of the battery system at a second moment according to the charging curve and the first temperature; comparing the second temperature with the second allowable temperature, and acquiring a cooling strategy according to a comparison result;
And obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
In yet another aspect, a computer readable storage medium is provided, having stored thereon a computer program which when executed by a processor performs the steps of:
Acquiring a capacity attenuation value of a battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold, and adjusting a first allowable temperature of the battery system according to a comparison result to acquire a second allowable temperature of the battery system;
Acquiring a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at the first moment; acquiring a second temperature of the battery system at a second moment according to the charging curve and the first temperature; comparing the second temperature with the second allowable temperature, and acquiring a cooling strategy according to a comparison result;
And obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
The method, the device, the computer equipment and the storage medium for cooling the lithium ion battery at high temperature take the full life cycle of the battery system into consideration, compare the capacity attenuation value of the battery system with a preset capacity attenuation threshold value, adjust the first allowable temperature of the battery system to obtain the second allowable temperature of the battery system, then obtain a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at the first moment, obtain the second temperature of the battery system at the second moment according to the charging curve and the first temperature, compare the second temperature with the second allowable temperature, obtain a cooling strategy according to the comparison result, obtain the cooling duration according to the heat value between the cooling strategy and the battery system and the charging environment, and cool the battery system according to the cooling duration, so as to solve the problems of poor cooling performance and the like of the lithium ion battery in the high temperature quick charging process.
Drawings
FIG. 1 is a diagram of an application environment of a method for high temperature fast charge cooling of a lithium ion battery in one embodiment;
FIG. 2 is a schematic flow chart of a method for high temperature fast charge cooling of a lithium ion battery according to an embodiment;
FIG. 3 is a schematic flow chart of a second temperature acquisition process in one embodiment;
FIG. 4 is a flow diagram of a method for obtaining a cooling strategy in one embodiment;
FIG. 5 is a flow chart of another embodiment for obtaining a cooling strategy;
FIG. 6 is a flow diagram of a method for obtaining a cooling duration in one embodiment;
FIG. 7 is a schematic flow diagram of cooling a battery system in one embodiment;
FIG. 8 is a flow diagram of updating a second allowable temperature in one embodiment;
fig. 9 is a block diagram of a high-temperature fast-charging cooling device for a lithium ion battery according to another embodiment;
Fig. 10 is an internal structural view of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The high-temperature quick-charging cooling method for the lithium ion battery provided by the application can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. For example, the high-temperature quick-charge cooling method for the lithium ion battery can be applied to a scene of charging a new energy automobile, wherein the new energy automobile comprises a PHEV (Plug in Hybrid ELECTRIC VEHICLE, plug-in Hybrid electric vehicle) and an EV (ELECTRIC VEHICLE, pure electric vehicle), the lithium ion battery is used as a power source of the new energy automobile, belongs to an important component of the new energy automobile, the performance of the lithium ion battery directly influences the use of the electric vehicle, and in all environmental factors, the temperature influences the charge and discharge performance of the lithium ion battery to the greatest extent, although the working temperature of the lithium ion battery is in a range of-20 ℃ to 45 ℃, when the working temperature is higher than 40 ℃, the performance, the capacity and the service life of the lithium ion battery are influenced, the safety risk is increased, and the charge and discharge capacity is weakened. At present, a cooling system can be arranged on a power battery, the battery is firstly subjected to cooling treatment and is forbidden to be charged in a high-temperature charging stage through a liquid cooling circulation system, and the battery is started to be charged after the temperature of the battery system is reduced. However, the life cycle of the battery system is not considered in the method, and as the battery system ages, the increase of the internal resistance of the battery can enhance the influence of high temperature on the battery, so that the high-temperature battery system cannot be cooled in time; the method comprises the steps of considering the full life cycle of the lithium ion battery, comparing a capacity attenuation value of the battery system with a preset capacity attenuation threshold value, adjusting a first allowable temperature of the battery system to obtain a second allowable temperature of the battery system, obtaining a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at a first moment, obtaining a second temperature of the battery system at a second moment according to the charging curve and the first temperature, comparing the second temperature with the second allowable temperature, obtaining a cooling strategy according to a comparison result, obtaining a cooling time length according to a heat value between the cooling strategy and the battery system and a charging environment, and cooling the battery system according to the cooling time length, so that the problems of poor cooling performance and the like of the lithium ion battery in a high-temperature quick charging process are solved. In a specific implementation process, the specific time for executing the method may be received by the terminal 102 from the server 104, or a plurality of parameter values in the state and charging process of the battery system of the new energy automobile may be sent from the terminal 102 to the server 104, so that the server 104 issues the specific time for executing the method after receiving the parameter information. The terminal 102 may be, but not limited to, a personal computer, a notebook computer, a smart phone, a tablet computer, a portable wearable device, or a sub-server, and the server 104 may be implemented by a server cluster or a cloud computing platform formed by a plurality of servers or a stand-alone server.
In one embodiment, as shown in fig. 2, a method for cooling a lithium ion battery at a high temperature in a fast charge mode is provided, which includes the following steps:
S1, acquiring a capacity attenuation value of a battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold, and adjusting a first allowable temperature of the battery system according to a comparison result to acquire a second allowable temperature of the battery system;
S2, acquiring a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at the first moment; acquiring a second temperature of the battery system at a second moment according to the charging curve and the first temperature; comparing the second temperature with the second allowable temperature, and acquiring a cooling strategy according to a comparison result;
And S3, obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
Through the steps, the problem of poor cooling performance of the lithium ion battery in the high-temperature quick-charging process can be solved.
As the battery system is used and aged, its internal resistance increases, and accordingly, if the same maximum allowable temperature is still adopted to determine whether to start the cooling process, the high temperature may not be effectively controlled in time, thereby deteriorating the safe environment of the battery system during the high temperature fast charging process, and further accelerating the attenuation of the battery system, so in step S1, it is exemplarily illustrated that the capacity attenuation value of the battery system is obtained, the capacity attenuation value is compared with the preset capacity attenuation threshold, the first allowable temperature of the battery system is adjusted according to the comparison result, the second allowable temperature of the battery system is obtained, for example, the annual attenuation rate or the ten thousand kilometers attenuation of the capacity of the battery system may be combined, according to which the maximum allowable temperature of the battery system is adjusted, the first allowable temperature can be set according to the maximum allowable temperature of the battery system at the factory moment, and the first allowable temperature is smaller than or equal to the maximum allowable temperature at the departure moment, for example, the first allowable temperature can be set to 45 ℃, then whether the capacity attenuation value of the battery system is larger than or equal to a preset capacity attenuation threshold value is judged, if yes, the value of the first allowable temperature is reduced, the second allowable temperature is obtained, for example, the second allowable temperature can be set to 40 ℃, so that the maximum allowable temperature is reasonably adjusted according to the full life cycle of the battery system, the situation that cooling treatment is not needed at the moment when judging according to the original maximum allowable temperature or the first allowable temperature is avoided under the condition of a certain height Wen Shuzhi is avoided, the battery system is in a working state of high-temperature quick charge for a long time, the safety risk is reduced, the service life of the battery system is increased.
After the second allowable temperature is obtained, in order to determine under what conditions the Battery system is to be cooled, in step S2, it is exemplarily illustrated that, according to the first temperature and the first state of charge of the Battery system at the first time, a charging curve from the first state of charge to the second state of charge is obtained, according to the charging curve and the first temperature, the second temperature and the second allowable temperature are obtained, a cooling strategy is obtained according to the comparison result, for example, the current time of charging the Battery system can be taken as the first time, the first temperature and the first state of charge value at the first time are obtained, then a target SOC of charging is set as the second state of charge, after knowing the first state of charge and the second state of charge, the remaining charge time is calculated according to the Battery management system (Battery MANAGEMENT SYSTEM, BMS), the second temperature of the Battery system at the second time is obtained according to the charging curve, and the cooling strategy is obtained according to the second temperature and the second allowable temperature value ratio, in some implementations, the second time is selected as the first time, the current time is not predicted to be increased from the first time to the second state of charge, the current state of charge is further predicted from the first time to the second state of charge, and the state of charge is not increased to the current state of charge is predicted for the Battery system at the first time, and the second state of charge is not increased to the current state of charge is estimated to be the second time 1, a more efficient cooling strategy is achieved by estimating at which time the battery temperature will rise to the point where cooling is required before the actual temperature does not rise.
After the cooling strategy is acquired, the cooling strategy needs to be executed at a proper time, and in step S3, it is exemplarily illustrated that, according to the cooling strategy and the heat value between the battery system and the charging environment, the cooling duration is acquired, and the battery system is cooled according to the cooling duration, for example, the heating value of the battery system, the heat exchange amount between the battery system and the charging environment, and the cooling power of the cooling device are acquired, and the time required for cooling the battery in a period of time is calculated, so that the temperature of the battery system is controlled within a reasonable interval range.
In some embodiments, as shown in fig. 3, the step of obtaining a second temperature of the battery system at a second time according to the charging curve and the first temperature includes:
S11, acquiring the charging current of the battery system at the second moment according to the charging curve;
And S12, acquiring the second temperature of the battery system at the second moment according to the charging current and the basic attribute of the battery system, wherein the basic attribute of the battery system comprises an internal resistance value of the battery system, a specific heat value of the battery system and a mass quantity of the battery system.
As shown in fig. 3, in step S11, it is exemplarily illustrated that the charging current at the second time is obtained according to the charging current curve, for example, the charging current curve is obtained from the BMS according to the set first state of charge and second state of charge, and the abscissa of the charging current curve may be time and the ordinate may be a current value, so that the charging current corresponding to a certain time may be obtained through the charging current curve.
As shown in fig. 3, in step S12, it is exemplarily illustrated that the second temperature at the second time is calculated according to the charging current and the basic attribute of the battery system, for example, the mass value of the battery system, the internal resistance value of the battery system, and the specific heat value of the battery system are obtained, and the second temperature at the second time is calculated, which is expressed in mathematical terms as:
T2=T1+Σ(I_t*I_t*R*Δt)/(C*m)
Wherein T1 is the first temperature at the first moment, T2 is the second temperature at the second moment, I_t is the charging current at the moment, R is the internal resistance value of the battery system, C is the specific heat value of the battery system, m is the mass value of the battery system, deltat is the minimum moment value between the first moment and the second moment, and Σ (·) is a sum function.
In some implementations, Δt can be set to 1 second.
To obtain a cooling strategy, a second temperature needs to be compared to a second allowable temperature, as shown in fig. 4, and in some embodiments, the step of obtaining the cooling strategy based on the comparison result includes:
s21, judging whether the second temperature is greater than the second allowable temperature or not;
s22, if yes, acquiring a first cooling strategy;
And S23, if not, acquiring a second cooling strategy and acquiring a second temperature of the battery system at a third moment.
As shown in fig. 4, in step S21 to step S23, it is exemplarily illustrated that different cooling strategies are obtained according to the result of the second temperature and the second allowable temperature, for example, when the second temperature is greater than the second allowable temperature, it may be considered that the charging process at that time needs to be cooled, the first cooling strategy is obtained, and if the second temperature is less than the second allowable temperature, it is considered that the charging process at that time does not need to be cooled, but the method predicts the battery system temperature during a period of time of the charging process in addition to the strategy that the temperature at a certain time is compared with the second allowable temperature to obtain whether cooling is performed, so when the second temperature at the second time is less than the second allowable temperature, in order to further predict whether the second temperature at the subsequent time is greater than the second allowable temperature, a third time may be selected between the first charge state and the second charge state, and the second temperature value corresponding to the third time may be calculated according to the charging current corresponding to the third time.
After the second temperature at the third time is obtained, the second temperature may be further compared with the second allowable temperature, and as shown in fig. 5, the step of obtaining the cooling strategy further includes:
S31, judging whether the second temperature is greater than the second allowable temperature or not;
s32, if yes, acquiring a first cooling strategy;
s33, if not, acquiring a second cooling strategy.
Through the steps, the temperature of more charging time periods can be further judged, and the rationality and timeliness of cooling treatment of the battery system are improved.
As shown in fig. 5, in steps S31 to S33, it is exemplarily illustrated that the cooling strategy is updated according to the comparison result of the second temperature at the third time and the second allowable temperature, for example, when the second temperature corresponding to the third time is greater than the second allowable temperature, it is considered that the cooling process needs to be performed on the battery system at the third time to obtain the first cooling strategy, otherwise, the second cooling strategy is obtained, and in some implementations, the temperature may be raised by 0.5 degrees celsius or 1 degree celsius according to the accuracy of the temperature and the change of the charging current, by which the temperatures of different charging time ranges may be predicted. And the cooling strategy is acquired in advance.
After the cooling strategy is obtained, the cooling time length needs to be set, as shown in fig. 6, and according to the heat value between the cooling strategy and the battery system and the charging environment, the step of obtaining the cooling time length includes:
S41, judging whether the cooling strategy is a first cooling strategy or not;
S42, if yes, acquiring a heat value generated in the period from the first charge state to the second charge state, and acquiring a heat value generated in the period from the first temperature to the second temperature, wherein the heat value comprises a heating value of the battery system and a heat exchange value between the battery system and the charging environment, and acquiring the cooling duration t_cool according to the heat value and cooling power, and the mathematical expression is as follows:
t_cool=[(Q1-Q2)-(Q3-Q4)]/P
Wherein Q1 and Q3 represent the heating value, Q2 and Q4 represent the heat exchange value, and P represents the cooling power.
As shown in fig. 6, in steps S41 to S42, it is exemplarily illustrated that the duration of the on-cooling is calculated according to the heat value and the cooling power, for example, when the cooling strategy is the first cooling strategy, the battery system needs to be subjected to the cooling process, the heat generation value Q1 of the battery system and the heat exchange value Q2 between the battery system and the charging environment during the period from the first state of charge to the second state of charge are obtained, the heat generation value Q3 of the battery system and the heat exchange value Q4 between the battery system and the charging environment are obtained during the period from the first temperature to the second temperature greater than the second allowable temperature, and then the cooling duration t_cool needed to be subjected to the on-cooling process is obtained according to the cooling power P of the cooling device corresponding to the battery system, which is expressed mathematically as:
t_cool=[(Q1-Q2)-(Q3-Q4)]/P
wherein, the mathematical expression of the calorific value of the battery system is:
Q1=Σ(I_t*I_t*R*Δt)
Wherein, i_t is the charging current at time t, R is the internal resistance value of the battery system, Δt is the minimum time value between the first time and the second time, Σ (·) is the sum function.
The mathematical expression of the heat exchange quantity Q2 between the battery system and the charging environment is:
Q2=Σ(ΔQ0)
where Δq0 represents the difference between the temperature of the battery system and the ambient temperature over a period of Δt (e.g., 1 second), a specific value may be obtained according to the model of the battery system in the actual implementation process.
For Q3 and Q4, the calculation can also be performed by the above formula, but it is only necessary to select different time lengths to sum the current values in the time lengths. In this way, the length of time that the cooling process needs to be turned on can be calculated.
After the cooling time period is obtained, it is necessary to calculate when to start cooling, and as shown in fig. 7, the step of cooling the battery system according to the cooling time period includes:
And S51, subtracting the cooling time from the time value corresponding to the second charge state to obtain a cooling start time, and cooling the battery system when the charging time reaches the cooling start time.
Through the above steps, it is possible to calculate when to turn on cooling according to the cooling duration of the cooling process required to be turned on during the charging time.
As shown in fig. 7, in step S51, it is exemplarily illustrated that the cooling time is obtained by subtracting the cooling time period from the time value corresponding to the second state of charge, and the battery system is cooled when the charging time reaches the cooling time period, for example, the cooling time period is set to be t_cool, the time value corresponding to the second state of charge is set to be t_soc2, the cooling time period is set to be t_start, then t_start=t_soc2-t_cool, if t_start is greater than or equal to 0, the cooling process is started at the time of charging to t_start, and if t_start is less than 0, the cooling is immediately started, and in some implementations, the operation of cooling the battery is stopped when the new energy vehicle stops charging or the SOC is charged to 100%.
In some embodiments, the second allowable temperature needs to be updated according to a capacity fade value of the battery system, as shown in fig. 8, the capacity fade value is compared with a preset capacity fade threshold, the first allowable temperature of the battery system is adjusted according to the comparison result, and the step of obtaining the second allowable temperature of the battery system includes:
s61, judging whether the capacity attenuation value is larger than or equal to the capacity attenuation threshold value;
S62, if yes, subtracting a preset temperature difference value from the first allowable temperature to obtain the second allowable temperature;
And S63, if not, setting the first allowable temperature as the second allowable temperature.
Through the steps, the life cycle of the battery system can be considered, the second allowable temperature of the battery system is updated according to the attenuation capacity of the battery system, so that the highest allowable temperature is reasonably adjusted, and the situation that cooling treatment is not needed at the moment if judging according to the original highest allowable temperature or the first allowable temperature under the condition of a certain height Wen Shuzhi is avoided, so that the battery system is in a high-temperature fast-charging working state for a long time, the safety risk is reduced, and the service cycle of the battery system is prolonged.
As shown in fig. 8, in steps S61 to S63, it is exemplarily illustrated that the capacity fade value is compared with the capacity fade threshold value to obtain the second allowable temperature, for example, an annual fade rate or a ten thousand kilometer fade rate of the capacity of the battery system may be used as the capacity fade value E1, when the capacity fade value E1 is equal to or greater than the preset capacity fade threshold value E2, the first allowable temperature is subtracted by a preset temperature difference value to obtain the second allowable temperature, and in some implementations, the temperature difference value may be set to a value between 2 and 5 degrees celsius, and if the capacity fade value E1 is smaller than the capacity fade threshold value E2, the value of the first allowable temperature is directly used as the value of the second allowable temperature.
In one embodiment, as shown in fig. 9, there is provided a high-temperature fast-charging cooling device for a lithium ion battery, which is characterized by comprising:
The maximum temperature adjustment module is used for obtaining a capacity attenuation value of the battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold value, and adjusting the first allowable temperature of the battery system according to a comparison result to obtain a second allowable temperature of the battery system;
The system comprises a cooling strategy acquisition module, a cooling strategy acquisition module and a control module, wherein the cooling strategy acquisition module is used for acquiring a charging curve from a first charge state to a second charge state according to a first temperature of the battery system at a first moment and the first charge state;
And the cooling module is used for obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
In the maximum temperature adjustment module, it is exemplarily illustrated that a capacity attenuation value of the battery system is obtained, the capacity attenuation value is compared with a preset capacity attenuation threshold, a first allowable temperature of the battery system is adjusted according to a comparison result, a second allowable temperature of the battery system is obtained, for example, an annual attenuation rate or a ten thousand kilometer attenuation condition of the capacity of the battery system can be combined, a maximum allowable temperature of the battery system is adjusted according to the condition, in some embodiments, the first allowable temperature can be set according to the maximum allowable temperature of the battery system at a factory moment, and the first allowable temperature is less than or equal to the maximum allowable temperature at a factory moment, for example, the first allowable temperature can be set to 45 ℃ or 50 ℃, then, whether the capacity attenuation value of the battery system is greater than or equal to the preset capacity attenuation threshold is judged, if the capacity attenuation value of the battery system is greater than or equal to the preset capacity attenuation threshold, the value of the first allowable temperature is reduced, and the second allowable temperature is obtained, for example, the second allowable temperature can be set to 40 ℃ or 45 ℃ so that the maximum allowable temperature is reasonably adjusted according to the full life cycle of the battery system, in some embodiments, the maximum allowable temperature is not considered to be equal to the maximum allowable temperature, and under a certain condition of Wen Shuzhi, when the maximum allowable temperature is at the maximum allowable temperature at the factory moment, or the maximum allowable temperature is not required to be cooled, if the maximum allowable temperature is required, and the battery is not cooled, if the maximum allowable temperature is at the maximum allowable temperature is required, and is not is judged to be cooled, and if the maximum allowable temperature is at the maximum allowable temperature.
In the cooling strategy acquisition module, it is exemplified that a charging curve from a first state of charge to a second state of charge of a battery system is acquired according to a first temperature and a first state of charge of the battery system at a first time, a second temperature of the battery system at a second time is acquired according to the charging curve and the first temperature, the second temperature is compared with a second allowable temperature, a cooling strategy is acquired according to a comparison result, for example, a current time when the battery system is charged can be taken as the first time, a value of the first temperature and the first state of charge at the first time is acquired, then a target SOC of charging is set as the second state of charge, after the first state of charge and the second state of charge are known, a residual charging time is calculated according to a battery management system and a charging current curve is acquired, the second temperature of the battery system at the second time is acquired according to the charging current curve, and the value of the second temperature and the second allowable temperature is relatively large, in some implementation processes, a selection method of the second time can be that a time point which corresponds to the first time and the second state of charge is taken as the first time, a preferred time point between the first time and the second time is taken as the first time, a time point when the battery system is preferably charged is not estimated, the second time is not increased to the current temperature is not increased to the first time, the current state of charge is estimated, the battery temperature is not is increased to be further charge 1, and the current is not is increased to the current time is estimated to the current temperature is not is increased to the current time is not is increased until the current is actually is increased to the temperature is increased to the second temperature at the first time is 5, thereby a more efficient cooling strategy is obtained.
In the cooling module, it is exemplarily described that the cooling time period is obtained according to the cooling strategy and the heat value between the battery system and the charging environment, the battery system is cooled according to the cooling time period, for example, the heating value of the battery system, the heat exchange amount between the battery system and the charging environment, and the cooling power of the cooling device are obtained, the time required for cooling the battery in a period of time is calculated, and the time for starting cooling is determined according to the time required for cooling, so that the temperature of the battery system is controlled within a reasonable interval range.
The device can be applied to a high-temperature quick-charging scene of a new energy automobile, the capacity attenuation value of the battery system is compared with a preset capacity attenuation threshold value, the first allowable temperature of the battery system is adjusted to obtain the second allowable temperature of the battery system, then a charging curve from the first charge state to the second charge state is obtained according to the first temperature and the first charge state of the battery system at a first moment, the second temperature of the battery system at a second moment is obtained according to the charging curve and the first temperature, the second temperature is compared with the second allowable temperature, a cooling strategy is obtained according to a comparison result, the cooling time is obtained according to the heat value between the cooling strategy and the battery system and the charging environment, and the battery system is cooled according to the cooling time, so that the problems of poor cooling performance and the like of the lithium ion battery in the high-temperature quick-charging process are solved.
The specific limitation of the high-temperature fast-charging cooling device for the lithium ion battery can be referred to as the limitation of the high-temperature fast-charging cooling method for the lithium ion battery, and the description thereof is omitted herein. All or part of each module in the lithium ion battery high-temperature quick-charge cooling device can be realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 10. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing data of each parameter in the high-temperature quick-charging cooling process. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program when executed by the processor is used for realizing a high-temperature quick-charging cooling method of the lithium ion battery.
It will be appreciated by those skilled in the art that the structure shown in FIG. 10 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of when executing the computer program:
Acquiring a capacity attenuation value of a battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold, and adjusting a first allowable temperature of the battery system according to a comparison result to acquire a second allowable temperature of the battery system;
Acquiring a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at the first moment; acquiring a second temperature of the battery system at a second moment according to the charging curve and the first temperature; comparing the second temperature with the second allowable temperature, and acquiring a cooling strategy according to a comparison result;
And obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
Acquiring a capacity attenuation value of a battery system, comparing the capacity attenuation value with a preset capacity attenuation threshold, and adjusting a first allowable temperature of the battery system according to a comparison result to acquire a second allowable temperature of the battery system;
Acquiring a charging curve from the first charge state to the second charge state according to the first temperature and the first charge state of the battery system at the first moment; acquiring a second temperature of the battery system at a second moment according to the charging curve and the first temperature; comparing the second temperature with the second allowable temperature, and acquiring a cooling strategy according to a comparison result;
And obtaining cooling time according to the cooling strategy and the heat value between the battery system and the charging environment, and cooling the battery system according to the cooling time.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (SYNCHLINK) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
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| US10840567B2 (en) * | 2016-07-01 | 2020-11-17 | Mitsubishi Electric Corporation | Storage battery cooling control device and storage battery cooling control method |
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