CN116632409A - Battery pack cooling method and system and vehicle - Google Patents

Battery pack cooling method and system and vehicle Download PDF

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Publication number
CN116632409A
CN116632409A CN202310762416.6A CN202310762416A CN116632409A CN 116632409 A CN116632409 A CN 116632409A CN 202310762416 A CN202310762416 A CN 202310762416A CN 116632409 A CN116632409 A CN 116632409A
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China
Prior art keywords
cooling
condition
heat dissipation
battery pack
vehicle
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CN202310762416.6A
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Chinese (zh)
Inventor
蔡小刚
胡康
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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Priority to CN202310762416.6A priority Critical patent/CN116632409A/en
Publication of CN116632409A publication Critical patent/CN116632409A/en
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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
    • 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
    • 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
    • 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
    • H01M10/635—Control systems based on ambient temperature
    • 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
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • 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
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • 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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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a battery pack cooling method, a battery pack cooling system and a vehicle. The invention relates to the technical field of vehicles, which comprises the following steps: determining the current working condition of a vehicle, and acquiring working condition information corresponding to the current working condition; wherein, the operating mode information at least includes: status information of components located in the cooling circuit; the cooling circuit includes a first cooling circuit having a chiller and a second cooling circuit having a radiator; based on the working condition information, determining a heat dissipation condition currently corresponding to the vehicle, wherein the heat dissipation condition represents the heat dissipation capability currently possessed by the vehicle; and executing a corresponding cooling strategy on the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop under the current working condition. The method of the invention ensures that the cooling of the battery pack can be ensured under any condition of the vehicle, the overtemperature of the battery pack is delayed, and the spontaneous combustion risk of the battery pack is reduced.

Description

Battery pack cooling method and system and vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a battery pack cooling method and system and a vehicle.
Background
The automobile can be accompanied with complex road conditions in the running process, and the charging can also face different surrounding environments; the power battery is used as an energy source of the new energy vehicle, so that the safety problem is that the personal safety of a user is endangered, the property loss is caused, and the brand image is influenced;
the power battery is sensitive to temperature change, and the working condition has high requirement on the temperature of the power battery. At present, the cooling modes of the power battery for the vehicle mainly comprise the following steps: air cooling, liquid cooling and refrigerant cooling. Different cooling modes are generally selected according to different discharge/charge rates, ambient temperature and the like.
However, with the continuous updating of energy saving technology and new functions, the number of parts of the new energy automobile is gradually increased, the increase of the number of parts can bring about the increase of failure rate, and the whole automobile system can influence the power output due to the failure of a certain part, so that the battery pack is overtemperature or abnormal.
Disclosure of Invention
In view of the foregoing, embodiments of the present invention provide a battery pack cooling method, system, and vehicle to overcome or at least partially solve the foregoing problems.
According to a first aspect of an embodiment of the present invention, there is provided a battery pack cooling method, including:
Determining the current working condition of a vehicle, and acquiring working condition information corresponding to the current working condition; wherein, the operating mode information at least includes: status information of components located in the cooling circuit; the cooling circuit includes a first cooling circuit having a chiller and a second cooling circuit having a radiator;
based on the working condition information, determining a heat dissipation condition currently corresponding to the vehicle, wherein the heat dissipation condition represents the heat dissipation capability currently possessed by the vehicle;
executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and the preset priorities corresponding to the cooling loops under the current working condition;
wherein the cooling strategy includes passive cooling, active cooling, and remedial cooling, the active cooling providing an amount of cooling that is greater than the amount of cooling provided by the passive cooling, the passive cooling providing the amount of cooling that is greater than the amount of cooling of the remedial cooling.
Optionally, the executing, based on the heat dissipation condition and the preset priority corresponding to the cooling circuit under the current working condition, a corresponding cooling policy for the battery pack includes:
based on the heat dissipation conditions, adjusting the preset priority corresponding to the cooling loops to obtain the adjusted priority of each cooling loop;
And executing a corresponding cooling strategy on the battery pack based on the adjusted priority of each cooling circuit.
Optionally, the current working condition includes a driving working condition and a quick-charging working condition; the same cooling loop corresponds to different preset priorities in different current working conditions.
Optionally, in the case that the current operating condition is the fast charging operating condition, the method further includes:
acquiring the environment temperature of the vehicle;
determining a target temperature interval in which the ambient temperature is located in a plurality of preset temperature intervals;
based on the heat dissipation condition and the preset priority corresponding to the cooling loop under the current working condition, executing a corresponding cooling strategy on the battery pack, wherein the cooling strategy comprises the following steps:
executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and preset priorities corresponding to the cooling loops in the target temperature interval; the same cooling circuit corresponds to different preset priorities in different preset temperature intervals.
Optionally, in the case that the current working condition is the driving working condition, the working condition information further includes: a high-voltage power-on state of the vehicle; the determining, based on the working condition information, a heat dissipation condition currently corresponding to the vehicle includes:
Determining whether the vehicle is electrified at high voltage, whether a first part in the first cooling loop is normal and whether a second part in the second cooling loop is normal based on the working condition information;
when the vehicle is powered on at the high voltage and the first part is normal, determining that the heat dissipation condition is a first heat dissipation condition;
under the condition that the first heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a second heat dissipation condition;
under the condition that the first heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a third heat dissipation condition; the heat dissipation capacity corresponding to the first heat dissipation condition is larger than the heat dissipation capacity corresponding to the second heat dissipation condition, and the heat dissipation capacity corresponding to the second heat dissipation condition is larger than the heat dissipation capacity corresponding to the third heat dissipation condition;
and executing a corresponding cooling strategy for the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop under the current working condition, wherein the cooling strategy comprises the following steps:
when the first heat dissipation condition is met, keeping the preset priority corresponding to the cooling loop unchanged, and executing the active cooling on the battery pack;
When the second heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, executing the passive cooling on the battery pack;
and when the third heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, performing remedial cooling on the battery pack.
Optionally, the determining, based on the working condition information, a current corresponding heat dissipation condition of the vehicle includes:
determining whether a first part in the first cooling circuit and a second part in the second cooling circuit in the vehicle are normal based on the working condition information;
under the condition that the first part is normal, determining the heat dissipation condition as a fourth heat dissipation condition;
under the condition that the fourth heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a fifth heat dissipation condition;
under the condition that the fourth heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a sixth heat dissipation condition;
the executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and the preset priorities corresponding to the cooling loops in the target temperature interval includes:
Executing the active cooling on the battery pack under the fourth heat radiation condition and the target temperature interval is greater than a preset temperature value;
executing the passive cooling on the battery pack under the fifth heat radiation condition and the target temperature interval is smaller than or equal to a preset temperature value;
and performing the remedial cooling on the battery pack under the sixth heat dissipation condition.
Optionally, in performing the passive cooling on the battery pack, the method further comprises:
acquiring the temperature of the battery core of the battery pack in real time;
and when the temperature of the battery cell exceeds a preset temperature threshold, if the vehicle meets the fourth heat dissipation condition, executing the active cooling on the battery pack.
Optionally, the active cooling is used to cool the battery pack with the first cooling circuit;
the passive cooling is used for cooling the battery pack by utilizing the second cooling loop;
the remedial cooling is used for increasing the opening degree of a water pump close to the battery pack and/or increasing the power of a cooling fan; wherein the water pump is shared by the first cooling circuit and the second cooling circuit.
In a second aspect of the embodiment of the present invention, there is provided a battery pack cooling system, the system including:
the acquisition module is used for determining the current working condition of the vehicle and acquiring working condition information corresponding to the current working condition; wherein, the operating mode information at least includes: status information of components located in the cooling circuit; the cooling circuit includes a first cooling circuit having a chiller and a second cooling circuit having a radiator;
the determining module is used for determining a heat dissipation condition currently corresponding to the vehicle based on the working condition information, wherein the heat dissipation condition represents the heat dissipation capability of the vehicle currently;
the execution module is used for executing a corresponding cooling strategy for the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop under the current working condition;
wherein the cooling strategy includes passive cooling, active cooling, and remedial cooling, the active cooling providing an amount of cooling that is greater than the amount of cooling provided by the passive cooling, the passive cooling providing the amount of cooling that is greater than the amount of cooling of the remedial cooling.
Optionally, the execution module includes:
The adjusting module is used for adjusting the preset priority corresponding to the cooling loops based on the heat dissipation conditions to obtain the adjusted priority of each cooling loop;
and executing a corresponding cooling strategy on the battery pack based on the adjusted priority of each cooling circuit.
Optionally, the determining module includes:
the preset module is used for the current working conditions including a driving working condition and a quick-charging working condition; the same cooling loop corresponds to different preset priorities in different current working conditions.
Optionally, in the case that the current operating condition is the fast charging operating condition, the obtaining module further includes:
the first acquisition module is used for acquiring the environment temperature of the vehicle;
determining a target temperature interval in which the ambient temperature is located in a plurality of preset temperature intervals;
the determining module includes:
the first determining module is used for executing a corresponding cooling strategy on the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop in the target temperature interval; the same cooling circuit corresponds to different preset priorities in different preset temperature intervals.
Optionally, in the case that the current working condition is the driving working condition, the working condition information further includes: a high-voltage power-on state of the vehicle; the determining module includes:
the second determining module is used for determining whether the vehicle is electrified at high voltage, whether the first part in the first cooling loop is normal or not and whether the second part in the second cooling loop is normal or not based on the working condition information;
when the vehicle is powered on at the high voltage and the first part is normal, determining that the heat dissipation condition is a first heat dissipation condition;
under the condition that the first heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a second heat dissipation condition;
under the condition that the first heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a third heat dissipation condition; the heat dissipation capacity corresponding to the first heat dissipation condition is larger than the heat dissipation capacity corresponding to the second heat dissipation condition, and the heat dissipation capacity corresponding to the second heat dissipation condition is larger than the heat dissipation capacity corresponding to the third heat dissipation condition;
the execution module comprises:
the first execution module is used for keeping the preset priority corresponding to the cooling loop unchanged when the first heat dissipation condition is met, and executing the active cooling on the battery pack;
When the second heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, executing the passive cooling on the battery pack;
and when the third heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, performing remedial cooling on the battery pack.
Optionally, the determining module includes:
the second determining module is used for determining whether the first part in the first cooling loop and the second part in the second cooling loop in the vehicle are normal or not based on the working condition information;
under the condition that the first part is normal, determining the heat dissipation condition as a fourth heat dissipation condition;
under the condition that the fourth heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a fifth heat dissipation condition;
under the condition that the fourth heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a sixth heat dissipation condition;
the execution module comprises:
the second execution module is used for executing the active cooling on the battery pack under the fourth heat dissipation condition and under the condition that the target temperature interval is larger than a preset temperature value;
Executing the passive cooling on the battery pack under the fifth heat radiation condition and the target temperature interval is smaller than or equal to a preset temperature value;
and performing the remedial cooling on the battery pack under the sixth heat dissipation condition.
Optionally, in performing the passive cooling on the battery pack, the system further comprises:
the temperature module is used for acquiring the temperature of the battery cell of the battery pack in real time;
and when the temperature of the battery cell exceeds a preset temperature threshold, if the vehicle meets the fourth heat dissipation condition, executing the active cooling on the battery pack.
Optionally, the active cooling is used to cool the battery pack with the first cooling circuit;
the passive cooling is used for cooling the battery pack by utilizing the second cooling loop;
the remedial cooling is used for increasing the opening degree of a water pump close to the battery pack and/or increasing the power of a cooling fan; wherein the water pump is shared by the first cooling circuit and the second cooling circuit.
According to a third aspect of the embodiment of the invention, a vehicle is provided, which comprises the battery pack cooling system according to the second aspect of the embodiment of the invention.
By the method provided by the invention, the working condition of the current vehicle is required to be determined, and information related to the working condition is acquired, wherein the information comprises the state information of parts in a cooling loop, and the cooling loop consists of a first cooling loop (comprising a cooler) and a second cooling loop (comprising a radiator); then, according to the acquired working condition information, the current heat dissipation condition of the vehicle can be determined. The heat dissipation conditions reflect the current heat dissipation capacity of the vehicle, and finally, based on the heat dissipation conditions and the preset priority of each cooling loop under the current working condition, a corresponding cooling strategy is selected to be executed on the battery pack, and based on the working condition information, the current corresponding heat dissipation conditions of the vehicle are determined, wherein the heat dissipation conditions represent the current heat dissipation capacity of the vehicle; executing a corresponding cooling strategy for the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop under the current working condition; the battery pack can be cooled by selecting the first cooling loop or the second cooling loop according to different heat dissipation conditions, and the first cooling loop and the second cooling loop can be selectively executed according to different heat dissipation conditions and current working conditions in the cooling process, so that the first cooling loop and the second cooling loop can be switched.
In addition, the cooling strategy comprises passive cooling, active cooling and remedial cooling, and can be used for switching among the passive cooling, the active cooling and the remedial cooling under different working conditions, so that the cooling of the battery pack can be ensured under any condition of the vehicle, the overtemperature of the battery pack is delayed, and the spontaneous combustion risk of the battery pack is reduced. In addition, the fault processing strategy can be refined by considering the state information of the parts in the cooling loop, so that the corresponding function can be normally started when the corresponding function is still started under the condition that the parts are in fault, and the power loss of the vehicle caused by the faults of the parts is delayed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart illustrating steps of a method for cooling a battery pack according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an integrated architecture for cooling and thermal management of a battery pack according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a battery pack cooling strategy under driving conditions according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a battery pack cooling strategy under a fast-charge condition according to an embodiment of the present invention;
fig. 5 is a diagram of a battery pack cooling system according to an embodiment of the present invention.
Reference numerals:
1-a low temperature radiator; a 2-condenser; 3-an electronic fan; 4-a water overflow tank; 5. 7, 11 and 16 tee joints; 6-an electronic water pump; 8-OBC charging three-in-one; 9-three-in-one of the precursor bridge; 10-a rear drive bridge three-in-one 12-a first three-way valve; 13-a second three-way valve; 14-battery pack; 15-a battery water pump; 17-a cooler; 18-a four-way valve; 19-a compressor; 20-air conditioning; 21-a thermal expansion valve and a stop valve; 22-electronic expansion valve.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
Referring to fig. 1, fig. 1 is a flowchart illustrating steps of a method for cooling a battery pack according to an embodiment of the present invention, where the method includes:
step S101: determining the current working condition of a vehicle, and acquiring working condition information corresponding to the current working condition; wherein, the operating mode information at least includes: status information of components located in the cooling circuit; the cooling circuit includes a first cooling circuit having a cooler and a second cooling circuit having a radiator.
In this embodiment, the situation of the battery pack in the vehicle may be generally divided into a situation that the vehicle is driving, i.e. a driving condition, and a situation that the vehicle is charging, i.e. a fast charging condition, the operation mode of the battery pack is different under different conditions, but under both conditions, the battery pack will generate heat, and then excessive heat of the battery pack will cause many problems, resulting in a decrease in the service life of the battery pack or a decrease in performance, and more serious possibility may increase the thermal runaway risk of the battery, resulting in safety accidents such as overheating, burning or explosion of the battery.
The embodiment of the invention is described under the condition that the temperature of the battery pack exceeds the safety temperature, and the safety temperature of the battery pack is 35 ℃, then the condition that the temperature of the battery pack exceeds 35 ℃ indicates that the battery pack needs to be cooled, at the moment, the current working condition of the vehicle is confirmed, the corresponding working condition information is selected according to the current working condition to determine which mode is adopted to cool the battery pack, the working condition information at least comprises the state information of parts in a cooling circuit, the state information of the parts in the cooling circuit is used for determining which cooling circuit can be conducted to cool the battery pack, and the cooling circuit comprises a first cooling circuit with a cooler and a second cooling circuit with a radiator.
Referring to fig. 2, fig. 2 is a schematic diagram of a battery pack cooling and thermal management integrated architecture according to an embodiment of the present invention, to explain in detail a cooling circuit according to the present invention:
first, the first cooling circuit with a cooler, also called active cooling, the components of the path of the active cooling are:
path one: power battery 14- & gt second three-way valve 13- & gt four-way valve 18- & gt cooler 17- & gt three-way valve 16- & gt battery water pump 15- & gt power battery 14
Path two: compressor 19→condenser 2→electronic expansion valve 22→cooler 17→compressor 19.
Then a second cooling circuit with a radiator, also called passive cooling. The components of the passive cooling path are:
battery pack 14- & gtsecond three-way valve 13- & gtfirst three-way valve 12- & gtlow temperature radiator 1- & gtoverflow tank 4- & gtthree-way 16- & gtbattery water pump 15- & gtbattery pack 14.
In addition, there is remedial cooling, and the first three-way valve and the second three-way valve are in a default fault opening and closing state at the moment, and the battery pack is cooled by controlling the battery water pump and the electric fan to be in the maximum duty ratio.
Step S102: and determining a heat dissipation condition currently corresponding to the vehicle based on the working condition information, wherein the heat dissipation condition represents the heat dissipation capability of the vehicle currently.
In this embodiment, according to the working condition information, a specific openable cooling loop in the plurality of cooling loops may be determined, different cooling loops may be opened to perform different cooling actions, and the heat dissipation capacities of different cooling loops may also be different, so according to the working condition information, the current corresponding heat dissipation conditions of the vehicle may be determined, and different heat dissipation conditions may correspond to opening different cooling loops to dissipate heat of the battery pack.
Step S103: executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and the preset priorities corresponding to the cooling loops under the current working condition; wherein the cooling strategy includes passive cooling, active cooling, and remedial cooling, the active cooling providing an amount of cooling that is greater than the amount of cooling provided by the passive cooling, the passive cooling providing the amount of cooling that is greater than the amount of cooling of the remedial cooling.
In this embodiment, the cooling circuit includes a first cooling circuit and a second cooling circuit, where the first cooling circuit has a higher preset priority, and the second cooling circuit has a lower preset priority, so that the passive cooling is preferentially performed, and the passive cooling is performed next time, specifically, which cooling is required to be determined according to the heat dissipation condition, that is, a strategy for cooling the battery pack is selected under the combined action of the heat dissipation condition and the preset priority. The cooling capacity is the cooling effect of cooling the battery pack, the active cooling is that the condenser and the cooler are used for radiating, the passive cooling is that the low-temperature radiator is used for radiating, the remedial cooling is only used for radiating by the electronic fan, the cooling effect of the low-temperature radiator and the condenser is not good, the cooling effect of the condenser and the cooler is better than that of the low-temperature radiator, the cooling effect of the low-temperature radiator is better than that of the electronic fan, the time is shorter than that of the passive cooling and remedial cooling, the cooling capacity is more than that of the passive cooling and the remedial cooling, and similarly, the cooling capacity provided by the active cooling is larger than that provided by the passive cooling and the cooling capacity provided by the remedial cooling is larger than that provided by the passive cooling.
Specifically, the cooling amount provided by the active cooling is larger than the cooling amount provided by the passive cooling, the cooling amount provided by the passive cooling is larger than the cooling amount of the remedial cooling, the cooling condition has various situations, and a cooling strategy of the best matching current cooling requirement is selected to cool the battery pack by combining the current working condition to determine the passive cooling, the active cooling and the remedial cooling, however, in the specific selection, the limit of the cooling condition of the current vehicle may exist, the best matching cooling strategy cannot be realized to cool the battery pack, the cooling strategy capable of providing the cooling amount needs to be selected from other cooling strategies to cool the battery pack, namely, the preset priority corresponding to each cooling loop under the current working condition is executed on the battery pack, and thus the cooling of the battery pack is realized.
For example, assuming that the current working condition is a driving working condition, taking the safety of a driver into consideration, the battery pack needs to be cooled quickly, because the cooling capacity provided by active cooling is larger than the cooling capacity provided by passive cooling, the cooling capacity provided by passive cooling is larger than the cooling capacity provided by remedial cooling, at this time, active cooling is preferentially selected to cool the battery pack, so that the priority of the first cooling loop is highest, and then corresponding active cooling can be executed to cool the battery pack, however, the execution of active cooling needs to be executed only when the state of the part on the loop where the active cooling is located is normal, i.e. the part in the first cooling loop needs to work normally, therefore, the application obtains the state information of the part on the first cooling loop, and when the state of the part on the first cooling loop is normal, the part on the first cooling loop is cooled according to the preset priority, and the active cooling is adopted to cool the battery pack.
In addition, if the active cooling is not successfully performed, a cooling strategy is selected from the remaining passive cooling and remedial cooling according to the heat dissipation condition to cool the battery pack.
The method provided by the embodiment is applied to cooling the battery pack of the vehicle, and the corresponding cooling strategy can be selected to cool the battery pack of the vehicle according to the working condition information and the current corresponding cooling condition of the vehicle under different application scenes. The switching among passive cooling, active cooling and remedial cooling is realized, the heat dissipation of the battery pack can be guaranteed no matter under any condition of the vehicle, the overtemperature of the battery pack is delayed, and the spontaneous combustion risk of the battery pack is reduced. In addition, the fault processing strategy can be refined by considering the state information of the parts in the cooling loop, so that the corresponding function can be normally started when the corresponding function is still started under the condition that the parts are in fault, and the power loss of the vehicle caused by the faults of the parts is delayed. Starting from two main scenes of driving and fast charging, the cooling power consumption of the battery pack is saved, the effectiveness of the cooling function of the battery pack is fully considered, the cooling effect of the battery pack is guaranteed to the greatest extent, and the overtemperature or abnormality of the battery pack is delayed.
In one embodiment, the executing the corresponding cooling strategy for the battery pack based on the heat dissipation condition and the preset priority corresponding to the cooling circuit under the current working condition includes: based on the heat dissipation conditions, adjusting the preset priority corresponding to the cooling loops to obtain the adjusted priority of each cooling loop; and executing a corresponding cooling strategy on the battery pack based on the adjusted priority of each cooling circuit.
In this embodiment, the preset priority corresponding to the cooling loop is adjusted according to the heat dissipation condition, because under different working conditions, for example, the driving working condition, the preset priority corresponding to the cooling strategy is active cooling, but due to different heat dissipation conditions, for example, the battery power is very low, passive cooling is selected, the battery pack is cooled in a more energy-saving manner, at this time, the preset priority is required to be active cooling and is adjusted to passive cooling, at this time, the battery pack is cooled according to the adjusted priority, i.e., the passive cooling cools the battery pack.
In one embodiment, the current operating conditions include a driving condition and a fast-charge condition; the same cooling loop corresponds to different preset priorities in different current working conditions.
In this embodiment, the current working conditions include a driving working condition and a fast charging working condition, under the driving working condition, in order to ensure the safety of a driver, the preset priority of active cooling is set to be the highest, the preset priority of passive cooling is set to be lower, and the temperature of the battery pack can be cooled to a normal range as soon as possible. Generally, the preset priority order under the driving condition is active cooling-passive cooling-remedial cooling.
In the fast charging condition, in order to ensure the charging efficiency and reduce the consumption of electric energy, the preset pre-level of the passive cooling (corresponding to the second cooling loop) is set to be the highest, the preset priority of the active cooling is set to be lower, and the preset priority sequence in the fast charging condition is passive cooling-active cooling-remedial cooling.
In one embodiment, in the case where the current operating condition is the fast-charge operating condition, the method further includes: acquiring the environment temperature of the vehicle; determining a target temperature interval in which the ambient temperature is located in a plurality of preset temperature intervals; based on the heat dissipation condition and the preset priority corresponding to the cooling loop under the current working condition, executing a corresponding cooling strategy on the battery pack, wherein the cooling strategy comprises the following steps: executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and preset priorities corresponding to the cooling loops in the target temperature interval; the same cooling circuit corresponds to different preset priorities in different preset temperature intervals.
In this embodiment, when the current working condition of the vehicle is a fast charging working condition, the current ambient temperature of the vehicle is obtained, and the ambient temperature is the air temperature around the vehicle, and since the ambient temperature also affects the charging efficiency of the battery pack, a target temperature interval in which the ambient temperature is located is determined, where the target temperature interval is used to determine whether the current ambient temperature affects the cooling capacity provided by the cooling strategy when the battery pack is cooled.
Therefore, in addition to the heat dissipation condition, the target temperature interval where the ambient temperature is located needs to be known, so as to determine to execute the corresponding cooling strategy on the battery pack together under the fast charge condition. The same cooling circuit corresponds to different preset priorities in different preset temperature intervals, for example, the preset temperature interval is minus 5 ℃, at this time, because the environment temperature is lower, the required cooling capacity for cooling the battery pack is not needed to be large, the battery pack can also physically dissipate heat, and at this time, the priority of passive cooling with lower cooling capacity is adjusted to be high.
When the preset temperature interval is above 25 ℃, the effect of cooling the battery pack through the ambient temperature is not good, and active cooling with larger cooling capacity is selected as the preset priority in order to ensure that the battery pack can be at the safe temperature as soon as possible.
In one embodiment, in a case where the current operating condition is the driving operating condition, the operating condition information further includes: a high-voltage power-on state of the vehicle; the determining, based on the working condition information, a heat dissipation condition currently corresponding to the vehicle includes: determining whether the vehicle is electrified at high voltage, whether a first part in the first cooling loop is normal and whether a second part in the second cooling loop is normal based on the working condition information; when the vehicle is powered on at the high voltage and the first part is normal, determining that the heat dissipation condition is a first heat dissipation condition; under the condition that the first heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a second heat dissipation condition; under the condition that the first heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a third heat dissipation condition; the heat dissipation capacity corresponding to the first heat dissipation condition is larger than the heat dissipation capacity corresponding to the second heat dissipation condition, and the heat dissipation capacity corresponding to the second heat dissipation condition is larger than the heat dissipation capacity corresponding to the third heat dissipation condition.
When the corresponding cooling strategy is executed on the battery pack based on the heat dissipation conditions and the preset priorities corresponding to the cooling loops under the current working condition, the preset priorities corresponding to the cooling loops can be kept unchanged when the battery pack is subjected to the first heat dissipation conditions, and the active cooling is executed on the battery pack; when the second heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, executing the passive cooling on the battery pack; and when the third heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, performing remedial cooling on the battery pack.
In this embodiment, in the case where the current working condition is a running working condition, the working condition information further includes: in the high-voltage power-on state of the vehicle, generally, when the vehicle fails, in order to ensure the safety of personnel in the vehicle, the high-voltage power-on state is automatically powered down, however, the active cooling compressor can be normally used under the condition of high-voltage power-on, so that the condition of the vehicle under the condition of high-voltage power-on needs to be confirmed.
Referring to fig. 2, it can be known that the components in the first cooling circuit include a compressor, a four-way valve, a cooler, etc., and in active cooling, the following is described with the vehicle in a high-voltage power-on condition, the components in the second cooling circuit include a first three-way valve, a second three-way valve, a cooler, etc., the first component is the compressor and the four-way valve, and the second component is the first three-way valve and the second three-way valve:
Firstly, state information of the compressor and the four-way valve is acquired, when the compressor and the four-way valve are in a normal state, a first heat dissipation condition is determined, and at the moment, the first cooling loop can be judged to be in a conducting state, so that active cooling can be normally executed.
In the state information of the compressor and the four-way valve, when the compressor or the four-way valve is in a fault state, the first heat dissipation condition is determined to be unsatisfied, whether the second part is in a fault state or not is determined at the moment, and when the second part is in a normal state, the second heat dissipation condition is determined. In the case of the second component, whether the component is usable or not is generally determined by a signal transmitted from the component, but in the three-way valve, the opening/closing degree of the valve is further obtained, and if the opening/closing degree is within a set range, the valve is considered to be in a normal state. Passive cooling may be performed to cool the battery pack.
When the compressor or the four-way valve is in a fault state and the second part is in a fault state, the heat dissipation condition corresponds to the third heat dissipation condition, which means that the active cooling and the passive cooling are failed at the moment, and only remedial cooling can be executed.
The foregoing has described in detail the first heat dissipation condition, the second heat dissipation condition, and the third heat dissipation condition of the vehicle under the driving condition, and the following description will be made according to the heat dissipation conditions and the adjustment of the preset priorities corresponding to the cooling circuits under the current working condition:
And when the first cooling condition is met, the preset priority of the first cooling circuit is kept unchanged, and active cooling is still selected to cool the battery pack. And when the second cooling condition is met, the first cooling loop is switched to the second cooling loop, and at the moment, the preset priority corresponding to the second cooling loop is adjusted to be higher, so that the battery pack is passively cooled. And under the third heat dissipation condition, the preset priority levels corresponding to the first cooling loop and the second cooling loop respectively fail, and at the moment, remedial cooling is executed.
In one embodiment, the determining, based on the working condition information, a current corresponding heat dissipation condition of the vehicle includes: determining whether a first part in the first cooling circuit and a second part in the second cooling circuit in the vehicle are normal based on the working condition information; under the condition that the first part is normal, determining the heat dissipation condition as a fourth heat dissipation condition; under the condition that the fourth heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a fifth heat dissipation condition; and under the condition that the fourth heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a sixth heat dissipation condition.
Correspondingly, when executing a corresponding cooling strategy for the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop in the target temperature interval: the active cooling may be performed on the battery pack under the fourth heat radiation condition and the target temperature interval is greater than a preset temperature value; executing the passive cooling on the battery pack under the fifth heat radiation condition and the target temperature interval is smaller than or equal to a preset temperature value; and performing the remedial cooling on the battery pack under the sixth heat dissipation condition.
In this embodiment, when the vehicle is in a fast-charging condition, it is determined whether the first component in the first cooling circuit and the second component in the second cooling circuit are normal according to the working condition information. The first part is taken as a compressor and a four-way valve, the second part is taken as a first three-way valve and a second three-way valve for explanation, and the specific selection of the first part and the second part is not limited in this embodiment:
and under the condition that the compressor and the four-way valve are normal, determining the heat dissipation condition as a fourth heat dissipation condition, and executing active cooling.
Under the condition that the compressor or the four-way valve is in fault and the first three-way valve and the second three-way valve are normal, the heat dissipation condition is determined to be a fifth heat dissipation condition, and then the passive cooling can be executed.
In the case of a failure of the compressor or the four-way valve, and in the case of a failure of the first three-way valve or the second three-way valve, it is determined that the heat radiation condition is a sixth heat radiation condition, that is, remedial cooling is performed.
The fourth heat dissipation condition, the fifth heat dissipation condition and the sixth heat dissipation condition have been described in detail above, and when the vehicle is in a fast charge condition, the corresponding cooling strategy is selected to cool the battery pack in combination with the target temperature interval in which the vehicle is currently located.
Assuming that the preset temperature is 10 ℃, when the target temperature interval is greater than 10 ℃ under the fourth heat dissipation condition, actively cooling the battery pack. And when the target temperature interval is less than or equal to 10 ℃ under the fifth heat dissipation condition, passively cooling the battery pack. In the sixth heat radiation condition, the target temperature zone need not be considered, and remedial cooling is performed at this time.
In one embodiment, during the performing of the passive cooling of the battery pack, the method further comprises: acquiring the temperature of the battery core of the battery pack in real time; and when the temperature of the battery cell exceeds a preset temperature threshold, if the vehicle meets the fourth heat dissipation condition, executing the active cooling on the battery pack.
In this embodiment, during the process of cooling the battery pack, since the battery pack is still being charged, there is still a temperature rise condition, so the battery cell temperature of the battery pack is detected in real time, when the battery cell temperature exceeds the preset temperature threshold, the preset temperature threshold is assumed to be 45 ℃, at this time, the battery pack needs to be provided with more cooling capacity, at this time, it is determined whether the vehicle meets the fourth heat dissipation condition, and if so, active cooling is performed on the battery pack, so that the supply of cooling capacity is improved, and the battery pack is cooled rapidly.
In one embodiment, the active cooling is used to cool the battery pack with the first cooling circuit; the passive cooling is used for cooling the battery pack by utilizing the second cooling loop; the remedial cooling is used for increasing the opening degree of a water pump close to the battery pack and/or increasing the power of a cooling fan; wherein the water pump is shared by the first cooling circuit and the second cooling circuit.
In this embodiment, in conjunction with fig. 2, the passive cooling is to cool the battery pack using a first cooling circuit, which includes:
path one: the power battery 14, the second three-way valve 13, the four-way valve 18, the cooler 17, the three-way valve 16, the battery water pump 15 and the power battery 14;
Path two: compressor 19→condenser 2→electronic expansion valve 22→cooler 17→compressor 19.
In this case, the first cooling circuit has the best cooling effect on the battery pack.
In addition, there is remedial cooling, and the first three-way valve and the second three-way valve are in a default fault opening and closing state at the moment, and heat is diffused by controlling the maximum opening degree of the battery water pump and the maximum power of the electric fan so as to delay the time of limiting the charging power by the overtemperature of the battery pack and realize cooling of the battery pack.
The passive cooling is to cool the battery pack by using a second cooling circuit, and the second cooling circuit is as follows: battery pack 14- & gtsecond three-way valve 13- & gtfirst three-way valve 12- & gtlow temperature radiator 1- & gtoverflow tank 4- & gtthree-way 16- & gtbattery water pump 15- & gtbattery pack 14.
The remedial cooling is to increase the opening of the water pump close to the battery pack and/or increase the power of the cooling fan, the specific conditions of the first part and the second part are not known at this time, and the battery pack is subjected to remedial cooling by the cooling liquid in the cooling pipeline circulated by the cooling fan and the water pump. For example, the first three-way valve defaults to an opening degree when it fails, and in actual operation, the circulation of the coolant in the cooling circuit is not prevented, so that a part of the cooling battery pack can function.
By way of example, a complete description of the method provided by the present embodiment will be provided below with reference to fig. 3 and 4:
fig. 3 is a schematic diagram of a battery pack cooling strategy under a driving condition according to an embodiment of the present invention, and the steps in fig. 3 are as follows:
step S301: it is determined whether the vehicle is in a normal running state, if so, step S302 is skipped, and if not, step S306 is skipped.
Step S302: and detecting whether the temperature of the battery pack exceeds the safety temperature, namely, the temperature of the battery cells of the battery pack, if the safety temperature is 35 ℃, jumping to the step S303, and if not, stopping cooling.
Step S303: and detecting whether the compressor has no fault in self-detection and is normally started, if so, jumping to the step S304, and if not, jumping to the step S307.
Step S304: and detecting whether the four-way valve has no fault in a self-check manner, if so, jumping to the step S305, and if not, jumping to the step S307.
Step S305: and performing active cooling to cool the battery pack.
Step S306: if the vehicle is under abnormally high voltage, the process goes to step S307, and if not, the process goes to step S302.
Step S307: and detecting whether the first three-way valve has no fault, if so, jumping to the step S308, and if not, jumping to the step S310.
Step S308: and detecting whether the second three-way valve has no fault, if so, jumping to the step S309, and if not, jumping to the step S311.
Step S309: and performing passive cooling to cool the battery pack. At the moment, the fault of the cooling system can be prompted on the instrument panel, and the vehicle can slowly travel to a safe position and wait for rescue.
Step S310: detecting whether the opening and closing degree of the first three-way valve is within a preset range, if yes, jumping to step S308, and if no, jumping to step S311, wherein the preset range is more than 20% and less than or equal to 80%.
Step S309: and performing remedial cooling to cool the battery pack. The battery water pump and the electronic fan are started to be the maximum duty ratio, heat is diffused, the heat is prevented from being concentrated to cause fire or explosion accidents, at the moment, a cooling system can be prompted to fail on an instrument panel, and the vehicle can slowly travel to a safe position and be far away from the vehicle.
Fig. 4 is a schematic diagram of a battery pack cooling strategy under a fast charge condition according to an embodiment of the present invention, and the steps in fig. 4 are as follows:
step S401: and (3) detecting whether the temperature of the battery pack exceeds the safety temperature, namely, the temperature of the battery cells of the battery pack, if so, jumping to the step S302, and if not, stopping cooling.
Step S402: detecting whether the ambient temperature is in the first target temperature interval, if so, jumping to step S403, and if not, jumping to step S404, assuming that the first target temperature interval is less than or equal to minus 5 ℃.
Step S403: and detecting whether the first three-way valve has no fault, if so, jumping to the step S409, and if not, jumping to the step S410.
Step S404: and (3) detecting whether the ambient temperature is in a second target temperature interval, and if so, jumping to step S412 if the second target temperature interval is greater than minus 5 ℃ and less than or equal to 10 ℃, otherwise, jumping to step S405.
Step S405: detecting whether the ambient temperature is in the third target temperature interval, if yes, jumping to step S406, assuming that the second target temperature interval is greater than 10 ℃.
Step S406: and detecting whether active cooling can be performed, if yes, starting a compressor, an electronic fan and a battery water pump, and if not, jumping to step S408.
Step S406: and performing active cooling to cool the battery pack.
Step S407: detecting whether the passive cooling can be executed, if so, jumping to step S408, if not, judging again at the moment, and if not, jumping to step S405; if step S405 has already been passed, step S409 is skipped.
Step S408: the passive cooling is performed to cool the battery pack, and step S410 is skipped during the cooling process.
Step S409: and detecting whether the second three-way valve has no fault, if so, executing passive cooling, and starting the battery water pump and the fan to operate at the maximum duty ratio, and if not, jumping to the step S411.
Step S410: detecting whether the opening and closing degree of the first three-way valve is within a preset range, if yes, jumping to step S409, wherein the preset range is greater than 20% and less than or equal to 80%.
Step S411: active cooling is activated.
Step S412: and the battery water pump and the fan are started to operate at the maximum duty ratio.
Step S413: whether the passive cooling is normally executed is detected, if yes, the passive cooling is activated, and if not, step S414 is skipped.
Step S414: and detecting whether the temperature of the battery pack is higher than 45 ℃, if so, jumping to the step S406.
Example two
Referring to fig. 5, fig. 5 is a battery pack cooling system according to an embodiment of the present invention, the system including: an acquisition module 501, a determination module 502 and an execution module 503.
The acquiring module 501 is configured to determine a current working condition of a vehicle, and acquire working condition information corresponding to the current working condition; wherein, the operating mode information at least includes: status information of components located in the cooling circuit; the cooling circuit includes a first cooling circuit having a cooler and a second cooling circuit having a radiator.
The determining module 502 is configured to determine, based on the working condition information, a heat dissipation condition currently corresponding to the vehicle, where the heat dissipation condition characterizes a heat dissipation capability currently possessed by the vehicle.
And an execution module 503, configured to execute a corresponding cooling policy for the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling circuit under the current working condition.
Wherein the cooling strategy includes passive cooling, active cooling, and remedial cooling, the active cooling providing an amount of cooling that is greater than the amount of cooling provided by the passive cooling, the passive cooling providing the amount of cooling that is greater than the amount of cooling of the remedial cooling.
According to the system provided by the invention, the first cooling loop or the second cooling loop is selected to cool the battery pack according to different heat dissipation conditions through the acquisition module 501, the determination module 502 and the execution module 503, so that the first cooling loop and the second cooling loop are selected to be executed according to different heat dissipation conditions and current working conditions in the cooling process, and the switching of the first cooling loop and the second cooling loop is realized. And then can realize, to the switching between passive cooling, initiative cooling and the remedy cooling, guarantee at the vehicle no matter under any circumstances, can both guarantee the heat dissipation to the battery package, delay the battery package overtemperature, reduce the battery package risk of spontaneous combustion. In addition, the fault processing strategy can be refined by considering the state information of the parts in the cooling loop, so that the corresponding function can be normally started when the corresponding function is still started under the condition that the parts are in fault, and the power loss of the vehicle caused by the faults of the parts is delayed.
In this embodiment, the executing module 503 includes: the adjusting module is used for adjusting the preset priority corresponding to the cooling loops based on the heat dissipation conditions to obtain the adjusted priority of each cooling loop; and executing a corresponding cooling strategy on the battery pack based on the adjusted priority of each cooling circuit.
In this embodiment, the determining module 502 includes: the preset module is used for the current working conditions including a driving working condition and a quick-charging working condition; the same cooling loop corresponds to different preset priorities in different current working conditions.
In this embodiment, in the case where the current operating condition is the fast charging operating condition, the obtaining module 501 further includes: the first acquisition module is used for acquiring the environment temperature of the vehicle; determining a target temperature interval in which the ambient temperature is located in a plurality of preset temperature intervals; the determining module 502 includes: the first determining module is used for executing a corresponding cooling strategy on the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop in the target temperature interval; the same cooling circuit corresponds to different preset priorities in different preset temperature intervals.
In this embodiment, in a case where the current working condition is the running working condition, the working condition information further includes: a high-voltage power-on state of the vehicle; the determining module 502 includes: the second determining module is used for determining whether the vehicle is electrified at high voltage, whether the first part in the first cooling loop is normal or not and whether the second part in the second cooling loop is normal or not based on the working condition information; when the vehicle is powered on at the high voltage and the first part is normal, determining that the heat dissipation condition is a first heat dissipation condition; under the condition that the first heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a second heat dissipation condition; under the condition that the first heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a third heat dissipation condition; the heat dissipation capacity corresponding to the first heat dissipation condition is larger than the heat dissipation capacity corresponding to the second heat dissipation condition, and the heat dissipation capacity corresponding to the second heat dissipation condition is larger than the heat dissipation capacity corresponding to the third heat dissipation condition.
The executing module 503 includes: the first execution module is used for keeping the preset priority corresponding to the cooling loop unchanged when the first heat dissipation condition is met, and executing the active cooling on the battery pack; when the second heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, executing the passive cooling on the battery pack; and when the third heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, performing remedial cooling on the battery pack.
In this embodiment, the determining module 502 includes: the second determining module is used for determining whether the first part in the first cooling loop and the second part in the second cooling loop in the vehicle are normal or not based on the working condition information; under the condition that the first part is normal, determining the heat dissipation condition as a fourth heat dissipation condition; under the condition that the fourth heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a fifth heat dissipation condition; under the condition that the fourth heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a sixth heat dissipation condition; the heat dissipation capacity corresponding to the fourth heat dissipation condition is larger than the heat dissipation capacity corresponding to the fifth heat dissipation condition, and the heat dissipation capacity corresponding to the fifth heat dissipation condition is larger than the heat dissipation capacity corresponding to the sixth heat dissipation condition.
The executing module 503 includes: the second execution module is used for executing the active cooling on the battery pack under the fourth heat dissipation condition and under the condition that the target temperature interval is larger than a preset temperature value; executing the passive cooling on the battery pack under the fifth heat radiation condition and the target temperature interval is smaller than or equal to a preset temperature value; and performing the remedial cooling on the battery pack under the sixth heat dissipation condition.
In this embodiment, in performing the passive cooling on the battery pack, the system further includes: the temperature module is used for acquiring the temperature of the battery cell of the battery pack in real time; and when the temperature of the battery cell exceeds a preset temperature threshold, if the vehicle meets the fourth heat dissipation condition, executing the active cooling on the battery pack.
In this embodiment, the active cooling is used to cool the battery pack using the first cooling circuit; the passive cooling is used for cooling the battery pack by utilizing the second cooling loop; the remedial cooling is used for increasing the opening degree of a water pump close to the battery pack and/or increasing the power of a cooling fan; wherein the water pump is shared by the first cooling circuit and the second cooling circuit.
Example III
An embodiment of the invention provides a vehicle, which comprises the battery pack cooling system according to the second aspect of the embodiment of the invention.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, systems, vehicles according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create a system for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.
The above description of the battery pack cooling method, system and vehicle provided by the invention applies specific examples to illustrate the principles and embodiments of the invention, and the above examples are only used to help understand the method and core ideas of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims (10)

1. A method of cooling a battery pack, the method comprising:
determining the current working condition of a vehicle, and acquiring working condition information corresponding to the current working condition; wherein, the operating mode information at least includes: status information of components located in the cooling circuit; the cooling circuit includes a first cooling circuit having a chiller and a second cooling circuit having a radiator;
based on the working condition information, determining a heat dissipation condition currently corresponding to the vehicle, wherein the heat dissipation condition represents the heat dissipation capability currently possessed by the vehicle;
executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and the preset priorities corresponding to the cooling loops under the current working condition;
wherein the cooling strategy includes passive cooling, active cooling, and remedial cooling, the active cooling providing an amount of cooling that is greater than the amount of cooling provided by the passive cooling, the passive cooling providing the amount of cooling that is greater than the amount of cooling of the remedial cooling.
2. The method of claim 1, wherein the performing a corresponding cooling strategy on the battery pack based on the heat dissipation condition and a preset priority corresponding to the cooling circuit under the current operating condition comprises:
Based on the heat dissipation conditions, adjusting the preset priority corresponding to the cooling loops to obtain the adjusted priority of each cooling loop;
and executing a corresponding cooling strategy on the battery pack based on the adjusted priority of each cooling circuit.
3. The method of claim 1, wherein the current operating conditions include a driving condition and a fast-charge condition; the same cooling loop corresponds to different preset priorities in different current working conditions.
4. The method of claim 3, wherein, in the event that the current operating condition is the fast-charge operating condition, the method further comprises:
acquiring the environment temperature of the vehicle;
determining a target temperature interval in which the ambient temperature is located in a plurality of preset temperature intervals;
based on the heat dissipation condition and the preset priority corresponding to the cooling loop under the current working condition, executing a corresponding cooling strategy on the battery pack, wherein the cooling strategy comprises the following steps:
executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and preset priorities corresponding to the cooling loops in the target temperature interval; the same cooling circuit corresponds to different preset priorities in different preset temperature intervals.
5. The method of claim 2, wherein, in the case where the current operating condition is a driving operating condition, the operating condition information further includes: a high-voltage power-on state of the vehicle; the determining, based on the working condition information, a heat dissipation condition currently corresponding to the vehicle includes:
determining whether the vehicle is electrified at high voltage, whether a first part in the first cooling loop is normal and whether a second part in the second cooling loop is normal based on the working condition information;
when the vehicle is powered on at the high voltage and the first part is normal, determining that the heat dissipation condition is a first heat dissipation condition;
under the condition that the first heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a second heat dissipation condition;
under the condition that the first heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a third heat dissipation condition;
and executing a corresponding cooling strategy for the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop under the current working condition, wherein the cooling strategy comprises the following steps:
When the first heat dissipation condition is met, keeping the preset priority corresponding to the cooling loop unchanged, and executing the active cooling on the battery pack;
when the second heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, executing the passive cooling on the battery pack;
and when the third heat dissipation condition is met, after the preset priority corresponding to the cooling loop is adjusted, performing remedial cooling on the battery pack.
6. The method of claim 4, wherein determining the current corresponding heat dissipation condition of the vehicle based on the operating condition information comprises:
determining whether a first part in the first cooling circuit and a second part in the second cooling circuit in the vehicle are normal based on the working condition information;
under the condition that the first part is normal, determining the heat dissipation condition as a fourth heat dissipation condition;
under the condition that the fourth heat dissipation condition is not met and the second part is normal, determining that the heat dissipation condition is a fifth heat dissipation condition;
under the condition that the fourth heat dissipation condition is not met and the second part fails, determining that the heat dissipation condition is a sixth heat dissipation condition;
The executing a corresponding cooling strategy for the battery pack based on the heat dissipation conditions and the preset priorities corresponding to the cooling loops in the target temperature interval includes:
executing the active cooling on the battery pack under the fourth heat radiation condition and the target temperature interval is greater than a preset temperature value;
executing the passive cooling on the battery pack under the fifth heat radiation condition and the target temperature interval is smaller than or equal to a preset temperature value;
and performing the remedial cooling on the battery pack under the sixth heat dissipation condition.
7. The method of claim 6, wherein during the performing of the passive cooling of the battery pack, the method further comprises:
acquiring the temperature of the battery core of the battery pack in real time;
and when the temperature of the battery cell exceeds a preset temperature threshold, if the vehicle meets the fourth heat dissipation condition, executing the active cooling on the battery pack.
8. The method of any of claims 1-7, wherein the active cooling is used to cool the battery pack with the first cooling circuit;
The passive cooling is used for cooling the battery pack by utilizing the second cooling loop;
the remedial cooling is used for increasing the opening degree of a water pump close to the battery pack and/or increasing the power of a cooling fan; wherein the water pump is shared by the first cooling circuit and the second cooling circuit.
9. A battery pack cooling system, the system comprising:
the acquisition module is used for determining the current working condition of the vehicle and acquiring working condition information corresponding to the current working condition; wherein, the operating mode information at least includes: status information of components located in the cooling circuit; the cooling circuit includes a first cooling circuit having a chiller and a second cooling circuit having a radiator;
the determining module is used for determining a heat dissipation condition currently corresponding to the vehicle based on the working condition information, wherein the heat dissipation condition represents the heat dissipation capability of the vehicle currently;
the execution module is used for executing a corresponding cooling strategy for the battery pack based on the heat dissipation condition and the preset priority corresponding to each cooling loop under the current working condition;
wherein the cooling strategy includes passive cooling, active cooling, and remedial cooling, the active cooling providing an amount of cooling that is greater than the amount of cooling provided by the passive cooling, the passive cooling providing the amount of cooling that is greater than the amount of cooling of the remedial cooling.
10. A vehicle comprising the battery pack cooling system of claim 9.
CN202310762416.6A 2023-06-26 2023-06-26 Battery pack cooling method and system and vehicle Pending CN116632409A (en)

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Family Applications (1)

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