CN117284157A - Cooling control method and control device for power battery, storage medium, and vehicle - Google Patents

Cooling control method and control device for power battery, storage medium, and vehicle Download PDF

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Publication number
CN117284157A
CN117284157A CN202311126217.2A CN202311126217A CN117284157A CN 117284157 A CN117284157 A CN 117284157A CN 202311126217 A CN202311126217 A CN 202311126217A CN 117284157 A CN117284157 A CN 117284157A
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CN
China
Prior art keywords
cooling
power battery
target
temperature
charge
Prior art date
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Pending
Application number
CN202311126217.2A
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Chinese (zh)
Inventor
彭方爰
袁文静
黄荣
王鹏
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Beijing Electric Vehicle Co Ltd
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Beijing Electric Vehicle Co Ltd
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Application filed by Beijing Electric Vehicle Co Ltd filed Critical Beijing Electric Vehicle Co Ltd
Priority to CN202311126217.2A priority Critical patent/CN117284157A/en
Publication of CN117284157A publication Critical patent/CN117284157A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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

Abstract

The invention discloses a cooling control method and a control device of a power battery, a storage medium and a vehicle, wherein the method comprises the following steps: acquiring charge and discharge current and temperature of a power battery; determining a target cooling capacity requirement for cooling the power battery according to the charge-discharge current; the power cell is cooled based on the temperature and the target cooling demand. The cooling control method can effectively reduce the cooling energy consumption on the premise of keeping the power battery in a proper temperature range.

Description

Cooling control method and control device for power battery, storage medium, and vehicle
Technical Field
The present invention relates to the field of power battery technology, and more particularly, to a cooling control method of a power battery, a cooling control device of a power battery, a computer-readable storage medium, and a vehicle.
Background
At present, a single control strategy is generally adopted for cooling control of the power battery, for example, when the highest temperature of the battery system is greater than a liquid cooling start threshold, the BMS (Battery Management System ) sends a cooling requirement to request water temperature and flow rate at a battery inlet to cool the power battery.
In order to always meet the performance requirements of the power battery, the BMS generally transmits a request according to the maximum cooling capacity, resulting in transmitting the request according to the maximum requirement even in the case that the temperature of the power battery is not particularly high and the cooling requirement is not so urgent, resulting in cooling power consumption of the power battery greater than the actual requirement, causing a part of unnecessary power consumption.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a cooling control method for a power battery, which determines a target cooling capacity requirement for cooling the power battery according to a charging and discharging current of the power battery, and then cools the power battery based on a temperature and the target cooling capacity requirement, so that cooling energy consumption can be effectively reduced on the premise of maintaining a proper temperature range of the power battery.
A second object of the present invention is to provide a cooling control device for a power battery.
A third object of the present invention is to propose a computer readable storage medium.
A fourth object of the present invention is to propose a vehicle.
To achieve the above object, an embodiment of a first aspect of the present invention provides a cooling control method for a power battery, the method including: acquiring charge and discharge current and temperature of the power battery; determining a target cooling capacity requirement for cooling the power battery according to the charge-discharge current; cooling the power cell based on the temperature and the target cooling demand.
According to the cooling control method of the power battery, firstly, the charge and discharge current and the temperature of the power battery are obtained, then, the target cooling capacity requirement for cooling the power battery is determined according to the charge and discharge current, and finally, the power battery is cooled based on the temperature and the target cooling capacity requirement. Therefore, the method can effectively reduce the cooling energy consumption on the premise of keeping the power battery in a proper temperature range.
In addition, the cooling control method of the power battery according to the above-described embodiment of the invention may have the following additional technical features:
according to one embodiment of the invention, the determining a target cooling capacity demand for cooling the power battery according to the charge-discharge current includes: determining a current interval in which the charge and discharge current is located; and determining the target cold energy demand based on the current intervals, wherein different current intervals correspond to different target cold energy demands.
According to one embodiment of the present invention, when the cooling mode of the power battery is liquid cooling, the target cooling capacity requirement includes a target cooling liquid temperature and a target cooling liquid flow rate, and the cooling of the power battery based on the temperature and the target cooling capacity requirement includes: when the temperature is greater than a cooling start temperature threshold, controlling a cold source to cool the power battery based on the target cooling liquid temperature and the target cooling liquid flow; and when the temperature is smaller than a cooling closing temperature threshold value, controlling the cold source to stop cooling the power battery.
According to one embodiment of the present invention, when the cooling mode of the power battery is air cooling, the target cooling capacity demand includes a target wind speed, and the cooling of the power battery based on the temperature and the target cooling capacity demand includes: when the temperature is greater than a cooling start temperature threshold, controlling a fan to cool the power battery based on the target wind speed; and when the temperature is smaller than a cooling closing temperature threshold value, controlling the fan to stop cooling the power battery.
According to one embodiment of the present invention, when the cooling mode of the power battery is direct cooling by a refrigerant, the target cooling capacity demand includes a target cooling power, and the cooling of the power battery based on the temperature and the target cooling capacity demand includes: when the temperature is greater than a cooling start temperature threshold, controlling a refrigerant direct cooling system to cool the power battery based on the target cooling power; and when the temperature is smaller than a cooling closing temperature threshold value, controlling the refrigerant direct cooling system to stop cooling the power battery.
According to one embodiment of the invention, the cooling-on temperature threshold and the cooling-off temperature threshold are determined based on the charge-discharge current.
According to one embodiment of the invention, the target refrigeration demand is determined by: placing the power battery in an environment bin for standing until the temperature of the power battery is the same as the target environment temperature; and controlling the power battery to charge and discharge according to a target charge and discharge current, and regulating the cold energy used for cooling the power battery until the temperature of the power battery keeps the target temperature unchanged, so as to obtain a target cold energy requirement corresponding to the target charge and discharge current, wherein the current interval comprises the target charge and discharge current.
To achieve the above object, a second aspect of the present invention provides a cooling control device for a power battery, including: the acquisition module is used for acquiring the charge and discharge current and the temperature of the power battery; the determining module is used for determining a target cold energy requirement for cooling the power battery according to the charge-discharge current; and the control module is used for cooling the power battery based on the temperature and the target cold energy demand.
According to the cooling control device for the power battery, the acquisition module is used for acquiring the charge and discharge current and the temperature of the power battery, the determination module is used for determining the target cooling capacity requirement for cooling the power battery according to the charge and discharge current, and the control module is used for cooling the power battery based on the temperature and the target cooling capacity requirement. Therefore, the device can effectively reduce the cooling energy consumption on the premise of keeping the power battery in a proper temperature range.
To achieve the above object, a third aspect of the present invention provides a computer-readable storage medium having a program stored thereon, which when executed by a processor, implements the above-described cooling control method of a power battery.
According to the computer readable storage medium, the cooling energy consumption can be effectively reduced on the premise that the power battery maintains a proper temperature range by implementing the cooling control method of the power battery.
In order to achieve the above object, a vehicle according to a fourth aspect of the present invention includes a memory, a processor, and a program stored in the memory and executable on the processor, wherein the processor implements the cooling control method of the power battery when executing the program.
According to the vehicle provided by the embodiment of the invention, the cooling energy consumption can be effectively reduced on the premise that the power battery maintains a proper temperature range by executing the cooling control method of the power battery.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart of a cooling control method of a power battery according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of cooling control of a power cell according to one specific example of the invention;
FIG. 3 is a flow chart of a method of cooling control of a power cell according to another specific example of the invention;
fig. 4 is a flowchart of a cooling control method of a power battery according to still another specific example of the present invention;
fig. 5 is a block schematic diagram of a cooling control device of a power battery according to an embodiment of the present invention;
fig. 6 is a block schematic diagram of a vehicle according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A cooling control method of a power battery, a cooling control device of a power battery, a computer-readable storage medium, and a vehicle according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a cooling control method of a power battery according to an embodiment of the present invention.
As shown in fig. 1, the cooling control method of the power battery according to the embodiment of the invention may include the steps of:
s1, acquiring charge and discharge current and temperature of a power battery.
S2, determining a target cooling capacity requirement for cooling the power battery according to the charge-discharge current.
And S3, cooling the power battery based on the temperature and the target cooling capacity requirement.
Specifically, the power battery generates heat during charging and discharging, and self-heating during charging and discharging of the battery is strongly related to the magnitude of the charging and discharging current, so that the cooling control of the power battery can be performed according to the charging and discharging current of the power battery and the current temperature of the power battery. When the charge and discharge current of the power battery is obtained, for example, the charge and discharge current can be obtained according to a current sensor, and when the temperature of the power battery is obtained, the charge and discharge current can be obtained according to a temperature sensor, so that the temperature condition of the power battery can be known. In addition, when the charge and discharge current and the temperature of the power battery are obtained, the battery management system can also be obtained according to a BMS (Battery Management System), and the BMS can monitor the current change condition and the temperature change condition in the charge and discharge process of the power battery, so that the working state and the temperature condition of the battery are known, the heat management condition of the power battery can be evaluated through temperature reading, and the influence of overheating or supercooling on the performance and the service life of the power battery is avoided.
After the charge-discharge current is obtained, a target cooling capacity demand for cooling the power battery may be determined based on the charge-discharge current. For example, when the cooling mode of the power battery is different, the required target cooling capacity demand is different, for example, when the cooling mode is liquid cooling, the target cooling capacity demand may be the temperature of the cooling liquid and the flow rate of the cooling liquid, and when the cooling mode is air cooling, the target cooling capacity demand may be the air speed. And the target cooling capacity requirement can be determined according to the charge and discharge currents, and different charge and discharge currents correspond to different target cooling capacity requirements, for example, when the target cooling capacity requirement is the flow rate and the temperature of the cooling liquid, the corresponding relationship between a plurality of charge and discharge currents and the flow rate and the temperature of the cooling liquid can be stored in a table according to the magnitude of the charge and discharge currents, for example, by a table lookup method, and when one charge current or one discharge current is determined, the flow rate and the temperature of the corresponding cooling liquid can be determined.
After the target cooling capacity requirement for cooling the power battery is determined, the power battery can be cooled according to the target cooling capacity requirement and the temperature of the power battery, for example, when the current temperature of the power battery is higher, the power battery can be cooled, therefore, the target cooling capacity requirement for cooling the power battery is determined according to the charging and discharging current of the power battery, and then the power battery is cooled based on the temperature and the target cooling capacity requirement, so that the cooling energy consumption can be effectively reduced on the premise that the power battery can be kept in a proper temperature range.
According to one embodiment of the invention, determining a target cooling capacity demand for cooling a power battery based on a charge-discharge current includes: determining a current interval in which the charge and discharge current is located; and determining target cold energy demands based on the current intervals, wherein different current intervals correspond to different target cold energy demands.
Specifically, the self-heating of the power battery during charging or discharging is related to the magnitude of the charging and discharging current, that is, the larger the charging and discharging current is, the more serious the heating of the power battery is, and the smaller the charging and discharging current is, the less the heating of the power battery is, therefore, when the heating of the power battery is light, the cooling capacity requirement of the power battery should be reduced to a certain extent, so as to achieve the purpose of reducing unnecessary energy loss. That is, when determining the target cooling capacity demand for cooling the power battery according to the charge/discharge current, the current section in which the charge/discharge current is located is determined first, and may be divided into three current sections, i.e., a current section 1, a current section 2, and a current section 3, and the current section in which the charge/discharge current is located is determined according to the magnitude of the charge/discharge current, and when the charge/discharge current is smaller, i.e., when the charge/discharge current is smaller than a certain set value L1, the current section 1 may be determined, and when the charge/discharge current is larger, i.e., when the charge/discharge current is larger than a certain set value L3, the current section 3 may be determined, and when the charge/discharge current is moderate, i.e., when the charge/discharge current is larger than L1 and smaller than L3, the current section 2 may be determined.
After determining the current interval in which the charge and discharge current is located, determining the target cold energy requirement based on the current interval, wherein different current intervals correspond to different target cold energy requirements, for example, taking the above division into three current intervals as an example, the charge and discharge currents of the current interval 1, the current interval 2 and the current interval 3 are sequentially increased, when the charge and discharge current is in the current interval 1, the current charge and discharge current is smaller, the power battery generates less heat, the target cold energy requirement can be determined to be lower, and the power battery is cooled by the smaller target cold energy requirement; when the charge and discharge current is in the current interval 3, the current charge and discharge current is larger, the power battery is seriously heated, the larger target cold energy requirement can be determined, and the larger target cold energy requirement is used for cooling the power battery.
In the case of dividing the current section, the above description is given by taking the case of dividing 3 current sections as an example, and the plurality of current sections may be divided according to the actual situation, for example, the current sections may be divided into 4, 5 or more current sections, and the more the number of sections is divided, the more accurate the target cooling demand is in determining the cooling control, and the less the energy loss is in cooling the power battery.
According to one embodiment of the present invention, when the cooling mode of the power battery is liquid cooling, the target cooling capacity demand includes a target cooling liquid temperature and a target cooling liquid flow rate, and cooling the power battery based on the temperature and the target cooling capacity demand includes: when the temperature is greater than the cooling start temperature threshold, controlling a cold source to cool the power battery based on the target cooling liquid temperature and the target cooling liquid flow; and when the temperature is smaller than the cooling closing temperature threshold, controlling the cold source to stop cooling the power battery. Wherein the cooling-on temperature threshold and the cooling-off temperature threshold are determined based on the charge-discharge current.
Specifically, the target cooling capacity requirement may include a target cooling liquid temperature and a target cooling liquid flow rate, and when the charging current is larger, the target cooling liquid temperature is lower, the target cooling liquid flow rate is larger, and when the charging current is smaller, the target cooling liquid temperature is higher, the target cooling liquid flow rate is smaller, so that when the power battery temperature is higher, the power battery can be cooled by using the lower cooling liquid temperature and the larger cooling liquid flow rate as the power battery, and when the power battery temperature is lower, the power battery can be cooled by using the higher cooling liquid temperature and the smaller cooling flow rate as the power battery, so that the purpose of reducing energy consumption can be achieved.
In the case of cooling the power battery, there are various cooling modes for the power battery, for example, the cooling modes for the power battery may be liquid cooling, air cooling, direct cooling with a refrigerant, or the like. When the power battery is cooled by liquid cooling based on temperature and target cooling capacity requirements (target cooling liquid temperature and target cooling liquid flow), the temperature of the power battery can be compared with a cooling start temperature threshold, when the temperature is higher than the cooling start temperature threshold, the current power battery temperature is higher, the power battery needs to be cooled, and the cooling source can be controlled to cool the power battery according to the target cooling liquid temperature and the target cooling liquid flow.
When the cold source is controlled to cool the power battery, different current intervals correspond to different target cooling liquid temperatures and target cooling liquid flows, the current dividing into 3 current intervals is taken as an example, the current of the current interval 1, the current interval 2 and the current interval 3 are sequentially increased, when the charge and discharge current is in the current interval 1, the target cooling liquid temperature is determined to be A1 ℃, the target cooling liquid flow is determined to be B1L/min, when the charge and discharge current is in the current interval 2, the target cooling liquid temperature is determined to be A2 ℃ and the target cooling liquid flow is determined to be B2L/min, when the charge and discharge current is in the current interval 3, the target cooling liquid temperature is determined to be A3 ℃, the target cooling liquid flow is determined to be B3L/min, and when the target cooling liquid temperature A1 ℃ is higher than the target cooling liquid temperature A2 ℃ and is higher than the target cooling liquid temperature A3 ℃, the target cooling liquid flow B1L/min is lower than the target cooling liquid flow B3L/min, so that when the charge and discharge current is higher than the current is controlled to cool the power battery, the power battery can be cooled, and the power consumption can be reduced rapidly, and the power consumption can be reduced to the target cooling liquid temperature is lower than the target cooling liquid temperature and the target cooling liquid temperature is lower than the target cooling liquid temperature A3L/min, and the power battery is cooled.
Along with the charge and discharge process of the power battery, the current of the power battery can be gradually reduced, the heating value of the power battery is reduced, the temperature of the battery is stable and balanced, after cooling, the temperature of the power battery is gradually reduced, the temperature is compared with a cooling closing temperature threshold value, when the temperature is smaller than the cooling closing temperature threshold value, the current temperature of the power battery is lower, and the cooling source can be controlled to stop cooling the power battery.
The cooling-on temperature threshold and the cooling-off temperature threshold are determined based on the charge-discharge current, and different charge-discharge currents correspond to different cooling-on temperature threshold and cooling-off temperature threshold, for example, when the charge-discharge current is small, the cooling-on temperature threshold and the cooling-off temperature threshold may be determined to be small, and when the charge-discharge current is large, the cooling-on temperature threshold and the cooling-off temperature threshold may be determined to be large.
According to one embodiment of the present invention, when the cooling mode of the power battery is air cooling, the target cooling capacity demand includes a target wind speed, and cooling the power battery based on the temperature and the target cooling capacity demand includes: when the temperature is greater than the cooling start temperature threshold value, controlling a fan to cool the power battery based on the target wind speed; and when the temperature is smaller than the cooling closing temperature threshold value, controlling the fan to stop cooling the power battery.
Specifically, the target cooling capacity requirement may further include a target wind speed, and the target wind speed and the charge and discharge current have a positive correlation, that is, the larger the charge and discharge current is, the larger the target wind speed is, and the smaller the charge and discharge current is, the smaller the target wind speed is. In the case of cooling the power battery, there are various cooling modes for the power battery, for example, the cooling modes for the power battery may be liquid cooling, air cooling, direct cooling with a refrigerant, or the like. When the power battery is cooled according to the temperature and the target cooling capacity requirement (target wind speed), the temperature of the power battery can be compared with a cooling start temperature threshold, when the temperature is higher than the cooling start temperature threshold, the current power battery temperature is higher, the power battery needs to be cooled, and the cooling source can be controlled according to the target wind speed to cool the power battery.
Along with the charge and discharge process of the power battery, the current of the power battery can be gradually reduced, the heating value of the power battery is reduced, the temperature of the battery is stable and balanced, after cooling, the temperature of the power battery is gradually reduced, the temperature is compared with a cooling closing temperature threshold value, when the temperature is smaller than the cooling closing temperature threshold value, the current temperature of the power battery is lower, and the fan can be controlled to stop cooling the power battery.
According to one embodiment of the present invention, when the cooling mode of the power battery is direct cooling of the refrigerant, the target cooling capacity demand includes a target cooling power, and cooling the power battery based on the temperature and the target cooling capacity demand includes: when the temperature is greater than the cooling start temperature threshold, controlling the refrigerant direct cooling system to cool the power battery based on the target cooling power; and when the temperature is less than the cooling closing temperature threshold, controlling the refrigerant direct cooling system to stop cooling the power battery.
Specifically, the target cooling capacity demand may further include a target cooling power, and the target cooling power and the charge-discharge current have a positive correlation, that is, the larger the charge-discharge current is, the larger the target cooling power, and the smaller the charge-discharge current is, the smaller the target cooling power is. In the case of cooling the power battery, there are various cooling modes for the power battery, for example, the cooling modes for the power battery may be liquid cooling, air cooling, direct cooling with a refrigerant, or the like. When the cooling mode of the power battery is direct cooling of the refrigerant, the refrigerant is introduced into an evaporator inside the power battery by using the refrigerant of the refrigerant direct cooling system to achieve the purpose of cooling, when the power battery is cooled based on temperature and target cooling capacity requirement (target cooling power), the temperature of the power battery can be compared with a cooling start temperature threshold, when the temperature is higher than the cooling start temperature threshold, the current power battery is higher in temperature, the power battery needs to be cooled, the refrigerant direct cooling system can be controlled to cool the power battery according to the target cooling power, for example, when the temperature of the power battery is higher, the target cooling power can be controlled to be higher, so that the refrigerant direct cooling system dissipates heat by taking the larger cooling power as the power battery, the temperature of the power battery can be rapidly reduced, when the temperature of the power battery is lower, the refrigerant can be controlled to be reduced, the direct cooling system dissipates heat by taking the smaller cooling power as the power battery, the temperature of the battery can be reduced, and the purpose of saving energy can be achieved.
Along with the charge and discharge process of the power battery, the current of the power battery can be gradually reduced, the heating value of the power battery is reduced, the temperature of the battery is stable and balanced, after cooling, the temperature of the power battery is gradually reduced, the temperature is compared with a cooling closing temperature threshold value, when the temperature is smaller than the cooling closing temperature threshold value, the current temperature of the power battery is lower, and the direct cooling system of the refrigerant can be controlled to stop cooling the power battery.
According to one embodiment of the invention, the target refrigeration demand is determined by: placing the power battery in an environment bin for standing until the temperature of the power battery is the same as the target environment temperature; and controlling the power battery to charge and discharge according to the target charge and discharge current, and regulating the cooling capacity for cooling the power battery until the temperature of the power battery keeps the target temperature unchanged, so as to obtain the target cooling capacity requirement corresponding to the target charge and discharge current, wherein the current interval comprises the target charge and discharge current.
Specifically, in determining the target cooling capacity demand, taking the determination of the target cooling capacity demand as the target cooling liquid temperature and the target cooling liquid flow rate as an example, the battery temperature range T0 to be controlled may be determined first according to the characteristics and performance requirements of the power battery, for example, after examining the safety, life and performance of a certain battery system, it is required to control the battery temperature below 45 ℃ under the fast charge and discharge conditions. The power cell is placed in an ambient bin for standing, and the target ambient temperature may be set at a higher temperature, for example, the target ambient temperature may be 40 ℃. When the target cooling capacity requirement corresponding to the target charging current is obtained, the electric quantity of the power battery can be adjusted to be less than 5%, the temperature soaking temperature of the power battery is consistent with the target environment temperature, the power battery is controlled to be charged according to the target charging current, for example, the characteristic currents I1, I2, I3, … … and In are extracted according to the power battery charging matrix, the target charging current I1 is taken as an example for charging, meanwhile, constant temperature cooling liquid can be injected, the temperature change condition of the power battery is observed, if the temperature of the power battery rises, the self-heating of the battery is determined to be greater than the cooling capacity of the power battery at the moment, the temperature of the cooling liquid is required to be regulated down or the flow is increased, otherwise, the temperature of the cooling liquid is required to be correspondingly regulated up or the flow is required to be reduced if the temperature of the power battery is reduced.
The amount of cooling for cooling the power battery is repeatedly adjusted, such as by adjusting the coolant temperature, until the power battery temperature is controlled to be at T0, and is kept balanced, no longer rises or falls, the target charging current I1 and the target coolant temperature A1 and the flow B1 at that time are recorded, and the above steps are repeated to obtain the currents I2, I3, … …, in, and their corresponding temperatures A2, A3, … …, an, and corresponding flows B2, B3, … …, bn. Likewise, when the power battery is obtained to discharge, the target cooling capacity requirement corresponding to the target discharging current can be obtained by adopting the steps.
In addition, when the target cooling capacity requirement is the target wind speed and the target cooling power, the target wind speed and the target cooling power corresponding to the target charge-discharge current can be obtained according to the method.
As a specific example, as shown in fig. 2, when the cooling mode of the power battery is liquid cooling, the cooling control method of the power battery may include the following steps:
s101, acquiring the charge and discharge current and the temperature of the power battery.
S102, determining a current interval in which the charge and discharge current is located.
S103, determining the target cooling liquid temperature and the target cooling liquid flow based on the current interval.
S104, judging whether the temperature is larger than a cooling start temperature threshold. If yes, step S105 is performed; if not, step S106 is performed.
S105, controlling the cold source to cool the power battery based on the target cooling liquid temperature and the target cooling liquid flow.
S106, judging whether the temperature is smaller than a cooling off temperature threshold. If yes, step S107 is performed; if not, step S101 is performed.
And S107, controlling the cold source to stop cooling the power battery.
As a specific example, as shown in fig. 3, when the cooling mode of the power battery is air cooling, the cooling control method of the power battery may include the following steps:
s201, acquiring the charge and discharge current and the temperature of the power battery.
S202, determining a current interval in which the charge and discharge current is located.
S203, determining a target wind speed based on the current interval.
S204, judging whether the temperature is larger than a cooling start temperature threshold. If yes, go to step S205; if not, step S206 is performed.
S205, controlling a fan to cool the power battery based on the target wind speed.
S206, judging whether the temperature is less than a cooling off temperature threshold. If yes, go to step S207; if not, step S201 is performed.
S207, controlling the fan to stop cooling the power battery.
As a specific example, as shown in fig. 4, when the cooling mode of the power battery is direct cooling of the refrigerant, the cooling control method of the power battery may include the following steps:
s301, acquiring the charge and discharge current and the temperature of the power battery.
S302, determining a current interval in which the charge and discharge current is located.
S303, determining the target cooling power based on the current interval.
S304, judging whether the temperature is larger than a cooling start temperature threshold. If yes, go to step S305; if not, step S306 is performed.
S305, controlling the refrigerant direct cooling system to cool the power battery based on the target cooling power.
S306, judging whether the temperature is less than a cooling-off temperature threshold. If yes, go to step S307; if not, step S301 is performed.
S307, controlling the refrigerant direct cooling system to stop cooling the power battery.
In summary, according to the cooling control method for the power battery of the embodiment of the invention, the charge-discharge current and the temperature of the power battery are obtained first, then the target cooling capacity requirement for cooling the power battery is determined according to the charge-discharge current, and finally the power battery is cooled based on the temperature and the target cooling capacity requirement. Therefore, the method can effectively reduce the cooling energy consumption on the premise of keeping the power battery in a proper temperature range.
Corresponding to the embodiment, the invention also provides a cooling control device of the power battery.
As shown in fig. 5, the cooling control 100 of the power battery according to the embodiment of the invention includes: an acquisition module 110, a determination module 120, and a control module 130.
The acquiring module 110 is configured to acquire a charge-discharge current and a temperature of the power battery. The determination module 120 is configured to determine a target cooling capacity demand for cooling the power battery based on the charge-discharge current. The control module 130 is configured to cool the power cells based on the temperature and the target cooling demand.
According to one embodiment of the invention, the determination module 120 determines a target cooling capacity demand for cooling the power battery based on the charge-discharge current, specifically for: determining a current interval in which the charge and discharge current is located; and determining target cold energy demands based on the current intervals, wherein different current intervals correspond to different target cold energy demands.
According to one embodiment of the present invention, when the cooling mode of the power battery is liquid cooling, the target cooling capacity requirement includes a target cooling liquid temperature and a target cooling liquid flow, and the control module 130 is specifically configured to cool the power battery based on the temperature and the target cooling capacity requirement: when the temperature is greater than the cooling start temperature threshold, controlling a cold source to cool the power battery based on the target cooling liquid temperature and the target cooling liquid flow; and when the temperature is smaller than the cooling closing temperature threshold, controlling the cold source to stop cooling the power battery.
According to one embodiment of the present invention, when the cooling mode of the power battery is air cooling, the target cooling capacity demand includes a target wind speed, and the control module 130 cools the power battery based on the temperature and the target cooling capacity demand, specifically for: when the temperature is greater than the cooling start temperature threshold value, controlling a fan to cool the power battery based on the target wind speed; and when the temperature is smaller than the cooling closing temperature threshold value, controlling the fan to stop cooling the power battery.
According to one embodiment of the present invention, when the cooling mode of the power battery is direct cooling of the refrigerant, the target cooling capacity demand includes a target cooling power, and the control module 130 is specifically configured to cool the power battery based on the temperature and the target cooling capacity demand: when the temperature is greater than the cooling start temperature threshold, controlling the refrigerant direct cooling system to cool the power battery based on the target cooling power; and when the temperature is less than the cooling closing temperature threshold, controlling the refrigerant direct cooling system to stop cooling the power battery.
According to one embodiment of the invention, the cooling-on temperature threshold and the cooling-off temperature threshold are determined based on the charge-discharge current.
According to one embodiment of the invention, the determining module 120 is further configured to: placing the power battery in an environment bin for standing until the temperature of the power battery is the same as the target environment temperature; and controlling the power battery to charge and discharge according to the target charge and discharge current, and regulating the cooling capacity for cooling the power battery until the temperature of the power battery keeps the target temperature unchanged, so as to obtain the target cooling capacity requirement corresponding to the target charge and discharge current, wherein the current interval comprises the target charge and discharge current.
It should be noted that, for details not disclosed in the cooling control device for a power battery in the embodiment of the present invention, please refer to details disclosed in the cooling control method for a power battery in the embodiment of the present invention, and details are not described here again.
According to the cooling control device for the power battery, the acquisition module is used for acquiring the charge and discharge current and the temperature of the power battery, the determination module is used for determining the target cooling capacity requirement for cooling the power battery according to the charge and discharge current, and the control module is used for cooling the power battery based on the temperature and the target cooling capacity requirement. Therefore, the device can effectively reduce the cooling energy consumption on the premise of keeping the power battery in a proper temperature range.
The present invention also proposes a computer-readable storage medium corresponding to the above-described embodiments.
The computer-readable storage medium of the embodiment of the present invention has a program stored thereon, which when executed by a processor, implements the cooling control method of a power battery described above.
According to the computer readable storage medium, the cooling energy consumption can be effectively reduced on the premise that the power battery maintains a proper temperature range by executing the cooling control method of the power battery.
Corresponding to the embodiment, the invention also provides a vehicle.
As shown in fig. 6, a vehicle 200 of an embodiment of the present invention may include: the above-described cooling control method for the power battery is implemented when the processor 220 executes the program stored in the memory 210, the processor 220, and the program executable on the processor 220.
According to the vehicle provided by the embodiment of the invention, the cooling energy consumption can be effectively reduced on the premise that the power battery maintains a proper temperature range by executing the cooling control method of the power battery.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A cooling control method of a power battery, characterized by comprising:
acquiring charge and discharge current and temperature of the power battery;
determining a target cooling capacity requirement for cooling the power battery according to the charge-discharge current;
cooling the power cell based on the temperature and the target cooling demand.
2. The method of claim 1, wherein said determining a target cooling demand for cooling the power battery based on the charge-discharge current comprises:
determining a current interval in which the charge and discharge current is located;
and determining the target cold energy demand based on the current intervals, wherein different current intervals correspond to different target cold energy demands.
3. The method of claim 1, wherein the target cooling capacity demand includes a target cooling liquid temperature and a target cooling liquid flow rate when the cooling mode of the power battery is liquid cooling, the cooling the power battery based on the temperature and the target cooling capacity demand comprising:
when the temperature is greater than a cooling start temperature threshold, controlling a cold source to cool the power battery based on the target cooling liquid temperature and the target cooling liquid flow;
and when the temperature is smaller than a cooling closing temperature threshold value, controlling the cold source to stop cooling the power battery.
4. The method of claim 1, wherein the target cooling demand comprises a target wind speed when the cooling of the power battery is air cooling, the cooling of the power battery based on the temperature and the target cooling demand comprising:
when the temperature is greater than a cooling start temperature threshold, controlling a fan to cool the power battery based on the target wind speed;
and when the temperature is smaller than a cooling closing temperature threshold value, controlling the fan to stop cooling the power battery.
5. The method of claim 1, wherein the target cooling capacity demand includes a target cooling power when the cooling mode of the power battery is direct cooling of a refrigerant, the cooling of the power battery based on the temperature and the target cooling capacity demand comprising:
when the temperature is greater than a cooling start temperature threshold, controlling a refrigerant direct cooling system to cool the power battery based on the target cooling power;
and when the temperature is smaller than a cooling closing temperature threshold value, controlling the refrigerant direct cooling system to stop cooling the power battery.
6. The method of any of claims 3-5, wherein the cooling-on temperature threshold and the cooling-off temperature threshold are determined based on the charge-discharge current.
7. The method of claim 2, wherein the target refrigeration demand is determined by:
placing the power battery in an environment bin for standing until the temperature of the power battery is the same as the target environment temperature;
and controlling the power battery to charge and discharge according to a target charge and discharge current, and regulating the cold energy used for cooling the power battery until the temperature of the power battery keeps the target temperature unchanged, so as to obtain a target cold energy requirement corresponding to the target charge and discharge current, wherein the current interval comprises the target charge and discharge current.
8. A cooling control device for a power battery, comprising:
the acquisition module is used for acquiring the charge and discharge current and the temperature of the power battery;
the determining module is used for determining a target cold energy requirement for cooling the power battery according to the charge-discharge current;
and the control module is used for cooling the power battery based on the temperature and the target cold energy demand.
9. A computer-readable storage medium, characterized in that a program is stored thereon, which when executed by a processor, implements the cooling control method of a power battery according to any one of claims 1 to 7.
10. A vehicle characterized by comprising a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the cooling control method of a power battery according to any one of claims 1-7 when executing the program.
CN202311126217.2A 2023-09-01 2023-09-01 Cooling control method and control device for power battery, storage medium, and vehicle Pending CN117284157A (en)

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CN202311126217.2A CN117284157A (en) 2023-09-01 2023-09-01 Cooling control method and control device for power battery, storage medium, and vehicle

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CN202311126217.2A CN117284157A (en) 2023-09-01 2023-09-01 Cooling control method and control device for power battery, storage medium, and vehicle

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CN117284157A true CN117284157A (en) 2023-12-26

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