CN112736320B - Method, device and equipment for determining cooling parameters of cooling system - Google Patents

Method, device and equipment for determining cooling parameters of cooling system Download PDF

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Publication number
CN112736320B
CN112736320B CN202011606136.9A CN202011606136A CN112736320B CN 112736320 B CN112736320 B CN 112736320B CN 202011606136 A CN202011606136 A CN 202011606136A CN 112736320 B CN112736320 B CN 112736320B
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battery pack
time period
cooling
output
calculating
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CN112736320A (en
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王宁
徐庆春
孙永刚
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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Neusoft Reach Automotive Technology Shenyang Co Ltd
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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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/443—Methods for charging or discharging in response to 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring 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
    • H01M10/63—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
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • 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 embodiment of the application discloses a method, a device and equipment for determining cooling parameters of a cooling system. And then controlling the battery pack to alternately charge and discharge, acquiring the current cell temperature of the battery pack, and acquiring the output power and the input power of the battery pack in a first time period when the current cell temperature meets a preset stable condition. And finally, calculating the cooling parameters of the cooling system by using the output power, the input power and the first time period. When the battery pack is cooled by the cooling liquid, the heat absorbed by the cooling system is obtained according to the heat emitted by the battery pack in a stable state, and then the cooling parameters of the cooling system are obtained by utilizing the output heat of the battery pack. The battery core temperature, the output power and the input power of the battery pack are easy to obtain, and the cooling parameters of the cooling system are more accurate through calculation.

Description

Method, device and equipment for determining cooling parameters of cooling system
Technical Field
The application relates to the technical field of batteries, in particular to a method, a device and equipment for determining cooling parameters of a cooling system.
Background
The battery is easy to generate heat in the using process, and the generated heat can affect the normal use of the battery and even the service life of the battery. In order to reduce the heat of the battery during use, a cooling system is usually required to assist in heat dissipation and temperature reduction.
The heat removal capacity of a cooling system is measured by cooling parameters. At present, a measuring method of cooling parameters of a cooling system is complex, and the obtained cooling parameters of the cooling system are not accurate enough.
Disclosure of Invention
In view of this, embodiments of the present application provide a method, an apparatus, and a device for determining a cooling parameter of a cooling system, which can obtain a more accurate cooling parameter of the cooling system.
In order to solve the above problem, the technical solution provided by the embodiment of the present application is as follows:
in a first aspect, the present application provides a method of determining a cooling parameter of a cooling system, the method comprising:
acquiring the initial cell temperature of the battery pack;
when the initial cell temperature is the target temperature, introducing cooling liquid into the battery pack; the temperature of the cooling liquid is consistent with the initial cell temperature;
controlling the battery pack to alternately perform charging and discharging;
acquiring the current cell temperature of the battery pack;
when the current battery core temperature meets a preset stable condition, acquiring the output power and the input power of the battery pack in a first time period;
and calculating the cooling parameters of the cooling system by using the output power, the input power and the first time period.
In one possible implementation manner, when the initial cell temperature is a target temperature, introducing a cooling liquid into the battery pack includes:
when the initial cell temperature is the target temperature, acquiring the operation condition of a cooling system;
selecting a target test working condition from the operation working conditions, and determining a target flow corresponding to the target test working condition;
and introducing cooling liquid into the battery pack according to the target flow.
In a possible implementation manner, the current cell temperature satisfying the preset stable condition is:
in a preset stable time period, the fluctuation range of the current electric core temperature of the battery pack is smaller than or equal to a preset temperature range; and the fluctuation range of the current cell temperature is obtained by calculation according to the current cell temperature and the historical cell temperature.
In one possible implementation, the calculating the cooling parameter of the cooling system using the output power, the input power and the first time period includes:
calculating output electric energy and input energy of the battery pack by using the output power, the input power and the first time period;
and calculating the cooling parameters of the cooling system by using the output electric energy, the input energy and the first time period.
In one possible implementation, the calculating the output electric energy and the input energy of the battery pack using the output power, the input power and the first time period includes:
acquiring input voltage and input current of the battery pack;
calculating the product of the input voltage and the input current to obtain input power;
calculating the integral of the input power and a second time period to obtain the input energy of the battery pack; the second time period is the charging time period of the battery pack in the first time period;
acquiring the output voltage and the output current of the battery pack;
calculating the product of the output voltage and the output current to obtain output power;
calculating the integral of the output power and a third time period to obtain the output electric energy of the battery pack; the third time period is a discharge time period of the battery pack in the first time period.
In one possible implementation manner, the calculating the cooling parameter of the cooling system by using the output electric energy, the input power and the first time period includes:
calculating the difference value between the input energy and the output electric energy to obtain the output heat of the battery pack; and dividing the output heat by the first time period to obtain a cooling parameter of the cooling system.
In one possible implementation, the controlling the battery pack to alternately charge and discharge includes:
and repeatedly executing control to pulse charge the battery pack in a fourth time period and pulse discharge in a fifth time period.
In a second aspect, the present application provides a cooling parameter determination apparatus for a cooling system, the apparatus comprising:
the first acquisition unit is used for acquiring the initial cell temperature of the battery pack;
the execution unit is used for introducing cooling liquid into the battery pack when the initial battery core temperature is the target temperature; the temperature of the cooling liquid is consistent with the initial cell temperature;
the control unit is used for controlling the battery pack to alternately charge and discharge;
the second acquisition unit is used for acquiring the current cell temperature of the battery pack;
the third obtaining unit is used for obtaining the output power and the input power of the battery pack in a first time period when the current battery core temperature meets a preset stable condition;
and the calculating unit is used for calculating the cooling parameters of the cooling system by using the output power, the input power and the first time period.
In a possible implementation manner, the execution unit is specifically configured to obtain an operation condition of the cooling system when the initial cell temperature is a target temperature;
selecting a target test working condition from the operation working conditions, and determining a target flow corresponding to the target test working condition;
and introducing cooling liquid into the battery pack according to the target flow.
In a possible implementation manner, the current cell temperature satisfying the preset stable condition is:
in a preset stable time period, the fluctuation range of the current electric core temperature of the battery pack is smaller than or equal to a preset temperature range; and the fluctuation range of the current cell temperature is obtained by calculation according to the current cell temperature and the historical cell temperature.
In one possible implementation manner, the computing unit includes:
a first calculating subunit, configured to calculate output electric energy and input energy of the battery pack using the output power, the input energy, and the first time period;
and the second calculating subunit is used for calculating the cooling parameters of the cooling system by using the output electric energy, the input energy and the first time period.
In a possible implementation manner, the first calculating subunit is specifically configured to obtain an input voltage and an input current of the battery pack;
calculating the product of the input voltage and the input current to obtain input power;
calculating the integral of the input power and a second time period to obtain the input energy of the battery pack; the second time period is the charging time period of the battery pack in the first time period;
acquiring the output voltage and the output current of the battery pack;
calculating the product of the output voltage and the output current to obtain output power;
calculating the integral of the output power and a third time period to obtain the output electric energy of the battery pack; the third time period is a discharge time period of the battery pack in the first time period.
In a possible implementation, the second computing subunit is specifically configured to
Calculating the difference value between the input energy and the output electric energy to obtain the output heat of the battery pack;
and dividing the output heat by the first time period to obtain a cooling parameter of the cooling system.
In a possible implementation manner, the control unit is specifically configured to control the battery pack to be pulse-charged in a fourth time period and pulse-discharged in a fifth time period;
and repeatedly executing control to pulse charge the battery pack in a fourth time period and pulse discharge in a fifth time period.
In a third aspect, the present application provides a cooling parameter determination apparatus of a cooling system, comprising: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is for storing one or more programs, the one or more programs including instructions, which when executed by the processor, cause the processor to perform any of the methods described above.
In a fourth aspect, the present application provides a computer-readable storage medium having stored therein instructions that, when executed on a terminal device, cause the terminal device to perform any of the methods described herein.
Therefore, the embodiment of the application has the following beneficial effects:
according to the method, the device and the equipment for determining the cooling parameters of the cooling system, the initial electric core temperature of the battery pack is obtained, and when the initial electric core temperature is the target temperature, cooling liquid with the temperature consistent with the initial electric core temperature is introduced into the battery pack. And then controlling the battery pack to alternately charge and discharge, acquiring the current cell temperature of the battery pack, and acquiring the output power and the input power of the battery pack in a first time period when the current cell temperature meets a preset stable condition. And finally, calculating the cooling parameters of the cooling system by using the output power, the input power and the first time period. Therefore, when the battery pack is cooled by the cooling liquid, the heat absorbed by the cooling system is obtained according to the heat emitted by the battery pack in a stable state, and the cooling parameters of the cooling system are obtained by utilizing the output electric energy of the battery pack. The battery core temperature, the input power and the output power of the battery pack are easy to obtain, and the accurate cooling parameters of the cooling system can be conveniently calculated.
Drawings
Fig. 1 is a schematic flowchart of a cooling parameter determination method for a cooling system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a cooling parameter determination apparatus of a cooling system according to an embodiment of the present application.
Detailed Description
In order to facilitate understanding and explaining the technical solutions provided by the embodiments of the present application, the following description will first describe the background art of the present application.
The inventor researches a method for determining cooling parameters of a traditional cooling system and finds that the cooling parameters of the traditional cooling system are calculated according to the difference of the temperatures of an object to be cooled before and after the object is cooled by the cooling system. The temperature of the object to be cooled may be affected in many ways, and the cooling parameters of the cooling system calculated by using the temperature difference of the object to be cooled are not accurate enough. In addition, the measurement of the temperature of the object to be cooled is complex, the temperature value is not convenient to obtain, and the process of calculating the cooling parameter of the cooling system is complex.
Based on this, an embodiment of the present application provides a method for determining a cooling parameter of a cooling system, where an initial cell temperature of a battery pack is obtained, and when the initial cell temperature is a target temperature, a cooling liquid with a temperature consistent with the initial cell temperature is introduced into the battery pack. And then controlling the battery pack to alternately charge and discharge, acquiring the current cell temperature of the battery pack, and acquiring the output power and the input power of the battery pack in a first time period when the current cell temperature meets a preset stable condition. And finally, calculating the cooling parameters of the cooling system by using the output power, the input power and the first time period. Therefore, when the battery pack is cooled by the cooling liquid, the heat absorbed by the cooling system can be obtained according to the heat emitted by the battery pack in a stable state, and the cooling parameters of the cooling system can be obtained by utilizing the output power of the battery pack. The battery core temperature, the input power and the output power of the battery pack are easy to obtain, and the accurate cooling parameters of the cooling system can be conveniently calculated.
In order to facilitate understanding of the technical solutions provided by the embodiments of the present application, a cooling parameter determining method of a cooling system provided by the embodiments of the present application is described below with reference to the accompanying drawings.
Referring to fig. 1, the figure is a flowchart of a cooling parameter determination method of a cooling system according to an embodiment of the present application, and the method includes steps S101 to S106.
S101: and acquiring the initial cell temperature of the battery pack.
The battery pack is a large-capacity battery pack composed of a plurality of batteries. The battery pack is provided with battery cores of all batteries, and the temperature of the battery cores can be influenced by the surrounding environment of the battery pack and the work of the batteries.
The initial cell temperature is the temperature of the cells in the battery before the battery is operated. When determining the cooling parameters of the cooling system, it may be ensured that the initial cell temperature of the battery pack is in a relatively stable state. And acquiring the initial cell temperature of the battery pack, and judging the initial cell temperature of the battery pack.
The embodiment of the application does not limit the obtaining mode of the initial cell temperature of the battery pack, and in a possible implementation mode, the initial cell temperature can be obtained through a sensor installed in the battery pack.
S102: when the initial cell temperature is the target temperature, introducing cooling liquid into the battery pack; the temperature of the cooling fluid is consistent with the initial cell temperature.
The target temperature may be a relatively stable initial cell temperature. The target temperature may coincide with the temperature of the environment in which the battery pack is located. For example, when the battery pack is in an indoor environment, the corresponding target temperature may be room temperature.
If the initial electric core temperature of the battery pack is the target temperature, the temperature of the electric core of the battery pack can be determined to be stable, and the subsequent measurement of the cooling parameters of the cooling system can be carried out.
The cooling liquid with the target temperature is introduced into the battery pack, at the moment, the temperature of the cooling liquid is the same as the initial electric core temperature of the battery pack, and the cooling liquid does not play a cooling role, so that the heat generated after the subsequent control of the battery pack is completely absorbed by the cooling liquid, and the cooling parameters of the obtained cooling system are accurate.
S103: and controlling the battery pack to alternately charge and discharge.
And controlling the battery pack to work, so that the battery pack alternately charges and discharges to generate corresponding heat.
In one possible implementation, in order to make the electric quantity of the battery pack more stable, the electric quantity increased after charging is the same as the electric quantity decreased after discharging.
Specifically, the controlling the battery pack to alternately perform charging and discharging includes:
and controlling the battery pack to be charged in a pulse mode in a fourth time period and discharged in a pulse mode in a fifth time period.
In the embodiment of the application, the battery pack charging can adopt pulse charging, and the battery pack discharging can adopt pulse discharging. Specifically, the battery pack may be controlled to perform pulse charging in a fourth time period, and perform pulse discharging in a fifth time period, where the fourth time period may be less than or equal to the fifth time period.
S104: and acquiring the current cell temperature of the battery pack.
After the alternate charging and discharging of the battery pack, the temperature of the cells of the battery pack may rise. And acquiring the temperature of the battery cell in the battery pack, namely the current battery cell temperature.
It can be understood that when the heat dissipation amount of the cooling system is equal to the heat generation amount of the battery pack, the cell temperature of the battery pack is maintained in a stable range. And judging whether the current cell temperature meets a preset stability condition, and determining the cooling parameters of the cooling system by using the heat productivity of the battery pack when the cell temperature of the battery pack is stable.
S105: and when the current cell temperature meets a preset stable condition, acquiring the output power and the input power of the battery pack in a first time period.
And if the current cell temperature can meet the preset stability condition, acquiring the heat productivity of the battery pack. The heat generation amount of the battery pack can be obtained by using the output power and the input power of the battery pack and time. The output power and the input power of the battery pack in the first time period are obtained. The first time period is any time period after the current cell temperature meets the preset stable condition.
The specific case that the current battery core temperature meets the preset stable condition is that: in a preset stable time period, the fluctuation range of the current electric core temperature of the battery pack is smaller than or equal to a preset temperature range; and the fluctuation range of the current cell temperature is obtained by calculation according to the current cell temperature and the historical cell temperature.
The historical cell temperature of the battery pack may be a current cell temperature corresponding to a previous time of the current time. And calculating a cell temperature difference value between the current cell temperature and the historical cell temperature, and taking the cell temperature difference value as the fluctuation range of the current cell temperature.
The preset temperature range may be set according to a fluctuation condition of the core temperature of the battery pack, for example, the preset temperature range may be set to 5 degrees celsius.
And if the fluctuation range of the current cell temperature of the battery pack is smaller than or equal to the preset temperature range, determining that the current cell temperature of the battery pack fluctuates stably.
It can be understood that the cell temperature stabilization corresponding to only one moment does not indicate that the cell temperature of the battery pack is already in a stable state. And when the fluctuation range of the current battery core temperature is stabilized for the first time, taking the moment corresponding to the acquired current battery core temperature as the starting moment. And judging whether the battery core temperature of the battery is stable within a certain time range based on the initial moment.
The preset stable time period is a preset time period for judging whether the cell temperature is stable. The preset stabilization period may be set according to the performance of the battery pack. For example, the preset stabilization period may be set to 30 minutes. The current cell temperature of the battery pack is used as the initial time when the current cell temperature of the battery pack starts to be stable, and if the current cell temperature corresponding to each time can meet the condition that the fluctuation range is smaller than or equal to the preset temperature range within the preset stable time period from the initial time, the current cell temperature of the battery pack can be determined to meet the preset stable condition. If the corresponding current cell temperature at a certain moment cannot meet the condition that the fluctuation range is smaller than or equal to the preset temperature range within the preset stable time period, the current cell temperature of the battery pack cannot meet the preset stable condition, and the starting moment needs to be determined again.
In a specific scenario, for example, the current cell temperature of the battery pack corresponding to each minute is obtained, and if the difference between the current cell temperature of the battery pack corresponding to the 60 th minute and the current cell temperature of the battery pack corresponding to the 59 th minute is 3 degrees celsius, the difference is less than 5 degrees celsius. The 60 th minute may be used as a starting time, and it may be determined whether the fluctuation range of the current cell temperature of the battery pack in the next 30 minutes is less than or equal to 5 degrees celsius. If the fluctuation ranges of the current cell temperatures of the battery packs corresponding to each minute in the 60 th minute to the 90 th minute are all less than or equal to 5 ℃, the current cell temperatures of the battery packs meet preset stable conditions, and the cooling parameters of the cooling system can be calculated from the 90 th minute. And if the fluctuation range of the current cell temperature of the battery pack at the 75 th minute is more than 5 ℃, stopping judging the current cell temperature within the preset stable time period. And re-determining the starting moment, and starting to judge the current cell temperature within the preset stable time period according to the newly determined starting moment.
S106: and calculating the cooling parameters of the cooling system by using the output power, the input power and the first time period.
The energy input into the battery pack can be calculated by utilizing the input power and the first time period, and the electric energy output by the battery pack can be calculated by utilizing the output power and the first time period. The energy difference between the energy input into the battery pack and the electric energy output from the battery pack is the energy consumed by the heat generation of the battery pack. When the temperature of the battery pack is stable, the heat generation amount of the battery pack is the same as the heat dissipation amount of the cooling system, and the cooling parameters of the cooling system can be calculated by using the heat generation amount of the battery pack.
In a possible implementation manner, the present application provides a specific implementation manner of calculating the cooling parameter of the cooling system by using the output power, the input power and the first time period, please refer to the following.
As can be seen from the above, in the method for determining cooling parameters of a cooling system according to the embodiment of the present application, the balance between the heat generation amount of the battery pack and the heat dissipation amount of the cooling system is ensured, and then the cooling parameters of the cooling system are calculated by using the output power, the input power, and the first time period of the battery pack. The battery pack cooling parameter acquiring method has the advantages that the battery pack relevant parameters can be acquired conveniently, the cooling parameters of the cooling system obtained through calculation are accurate, and the requirement for determining the cooling parameters of the cooling system can be met.
It can be understood that the flow rate of the cooling liquid influences the heat dissipation performance of the cooling system during the process of introducing the cooling liquid into the battery pack. In general, a cooling system is provided with corresponding coolant flows for various different heat dissipation requirements. And the cooling parameters of the cooling system are different under different working conditions.
In one possible implementation, the operating condition of the cooling system can be adjusted by selectively introducing cooling liquid into the battery pack according to different flow rates.
When the initial cell temperature is the target temperature, introducing a cooling liquid into the battery pack, including:
when the initial cell temperature is the target temperature, acquiring the operation condition of a cooling system;
selecting a target test working condition from the operation working conditions, and determining a target flow corresponding to the target test working condition;
and introducing cooling liquid into the battery pack according to the target flow.
And when the initial cell temperature is the target temperature, acquiring the operation condition of the cooling system. The operation condition is a condition which can be selected when the cooling system is in operation. And selecting a target test working condition needing to measure the cooling parameter from the operation working conditions. The target test condition may be any one of the operating conditions, for example, the target test condition may be a common operating condition.
And taking the target flow corresponding to the target test working condition as the flow for introducing the cooling liquid into the battery pack. This allows determination of the cooling parameter for the target test condition.
Based on the above, in the embodiment of the application, the target test working condition can be selected from the operation working conditions of the cooling system, and then the corresponding target flow of the input cooling liquid is determined according to the target test working condition, so that the determination of the cooling parameter corresponding to the target test working condition is realized.
The embodiment of the present application further provides a specific implementation manner for obtaining the cooling parameter of the cooling system by using the output power, the input power, and the first time period, which specifically includes the following two steps:
a1: calculating output electric energy and input energy of the battery pack by using the output power, the input power and the first time period.
The output power of the battery pack discharged in the first time period can be calculated by using the output power of the battery pack and the discharge time length of the battery pack in the first time period. The output power of the battery pack can be calculated by the output voltage and the output current of the battery pack.
In a possible implementation manner, calculating the output electric energy and the input energy of the battery pack by using the output power, the input power and the first time period specifically includes:
acquiring input voltage and input current of the battery pack;
calculating the product of the input voltage and the input current to obtain input power;
calculating the integral of the input power and a second time period to obtain the input energy of the battery pack; the second time period is the charging time period of the battery pack in the first time period;
acquiring the output voltage and the output current of the battery pack;
calculating the product of the output voltage and the output current to obtain output power;
calculating the integral of the output power and a third time period to obtain the output electric energy of the battery pack; the third time period is a discharge time period of the battery pack in the first time period.
The input voltage and the input current of the battery pack may be obtained by a charging device of the battery pack. And calculating the product of the input voltage and the input current of the battery pack to obtain the input power of the battery pack. And integrating the input power and the second time period to obtain the input energy of the input battery pack.
The output voltage and the output current of the battery pack may be obtained by a detection device of the battery pack. And calculating the product of the output voltage of the battery pack and the output current of the corresponding battery pack to obtain the output power of the corresponding battery pack. And integrating the output power with the third time period to obtain the output electric energy of the battery pack.
Note that the sum of the second time period and the third time period is the first time period.
A2: and calculating the cooling parameters of the cooling system by using the output electric energy, the input energy and the first time period.
The output heat of the battery pack in the first time period is the heat dissipation heat of the cooling liquid of the cooling system in the first time period. The output electric energy, the input energy and the first time period are used for calculating and obtaining the cooling parameters of the cooling system. In a possible implementation manner, the calculating a cooling parameter of the cooling system by using the output electric energy, the input energy, and the first time period specifically includes:
calculating the difference value between the input energy and the output electric energy to obtain the output heat of the battery pack;
and dividing the output heat by the first time period to obtain a cooling parameter of the cooling system.
Part of the energy input into the battery pack is converted into electric energy, and part of the energy is converted into heat energy. And calculating the difference value of the input energy and the output electric energy to obtain the output heat of the battery pack. The obtained output heat is divided by the first time period, so that the heat dissipation heat of the cooling system in the unit time period, namely the cooling parameter of the cooling system, can be obtained.
Based on the above, in the embodiment of the present application, the output heat of the battery pack in the first time period is obtained by first calculating by using the input power, the output power and the first time period of the battery pack, and then the cooling parameter of the cooling system is obtained by calculating by using the output heat. In this way, a convenient and accurate determination of the cooling parameters of the cooling system can be achieved.
Based on the method for determining the cooling parameter of the cooling system provided by the above method embodiment, the embodiment of the present application further provides a device for determining the cooling parameter of the cooling system, and the device for determining the cooling parameter of the cooling system will be described below with reference to the accompanying drawings.
Referring to fig. 2, the drawing is a schematic structural diagram of a cooling parameter determination device of a cooling system according to an embodiment of the present application. As shown in fig. 2, the cooling parameter determination device 200 of the cooling system includes:
a first obtaining unit 201, configured to obtain an initial cell temperature of a battery pack;
the execution unit 202 is configured to, when the initial cell temperature is a target temperature, introduce a cooling liquid into the battery pack; the temperature of the cooling liquid is consistent with the initial cell temperature;
a control unit 203 for controlling the battery pack to alternately perform charging and discharging;
a second obtaining unit 204, configured to obtain a current cell temperature of the battery pack;
a third obtaining unit 205, configured to obtain output power and input power of the battery pack in a first time period when the current cell temperature meets a preset stable condition;
a calculating unit 206, configured to calculate a cooling parameter of the cooling system using the output power, the input power, and the first time period.
In a possible implementation manner, the execution unit 202 is specifically configured to obtain an operation condition of the cooling system when the initial cell temperature is a target temperature;
selecting a target test working condition from the operation working conditions, and determining a target flow corresponding to the target test working condition;
and introducing cooling liquid into the battery pack according to the target flow.
In a possible implementation manner, the current cell temperature satisfying the preset stable condition is:
in a preset stable time period, the fluctuation range of the current electric core temperature of the battery pack is smaller than or equal to a preset temperature range; and the fluctuation range of the current cell temperature is obtained by calculation according to the current cell temperature and the historical cell temperature.
In one possible implementation manner, the computing unit includes:
a first calculating subunit, configured to calculate output electric energy and input energy of the battery pack using the output power, the input energy, and the first time period;
and the second calculating subunit is used for calculating the cooling parameters of the cooling system by using the output electric energy, the input energy and the first time period.
In a possible implementation manner, the first calculating subunit is specifically configured to obtain an input voltage and an input current of the battery pack;
calculating the product of the input voltage and the input current to obtain input power;
calculating the integral of the input power and a second time period to obtain the input energy of the battery pack; the second time period is the charging time period of the battery pack in the first time period;
acquiring the output voltage and the output current of the battery pack;
calculating the product of the output voltage and the output current to obtain output power;
calculating the integral of the output power and a third time period to obtain the output electric energy of the battery pack; the third time period is a discharge time period of the battery pack in the first time period.
In a possible implementation manner, the second calculating subunit is specifically configured to calculate a difference between the input energy and the output electric energy to obtain an output heat of the battery pack;
and dividing the output heat by the first time period to obtain a cooling parameter of the cooling system.
In a possible implementation manner, the control unit 203 is specifically configured to control the battery pack to be pulse-charged in a fourth time period and pulse-discharged in a fifth time period;
and repeatedly executing control to pulse charge the battery pack in a fourth time period and pulse discharge in a fifth time period.
Based on the cooling parameter determination method for the cooling system provided by the above method embodiment, the embodiment of the present application further provides a cooling parameter determination device for the cooling system, including: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is configured to store one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform the method of any of the embodiments described above.
Based on the method for determining the cooling parameter of the cooling system provided by the foregoing method embodiment, an embodiment of the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a terminal device, the terminal device is caused to execute the method according to any embodiment.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system or the device disclosed by the embodiment, the description is simple because the system or the device corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
It is further noted that, herein, relational terms such as first and second, and the like may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A method of determining cooling parameters of a cooling system, the method comprising:
acquiring the initial cell temperature of the battery pack;
when the initial cell temperature is the target temperature, introducing cooling liquid into the battery pack; the temperature of the cooling liquid is consistent with the initial cell temperature;
controlling the battery pack to alternately perform charging and discharging;
acquiring the current cell temperature of the battery pack;
when the current battery core temperature meets a preset stable condition, acquiring the output power and the input power of the battery pack in a first time period;
calculating a cooling parameter of the cooling system by using the output power, the input power and the first time period;
wherein the calculating the cooling parameter of the cooling system using the output power, the input power and the first time period comprises:
calculating an output electrical energy and an input energy of the battery pack using the output power, the input power, and the first time period, the input energy being determined based on an integration of the input power with a second time period, the second time period being a charging time period of the battery pack during the first time period;
and calculating the cooling parameters of the cooling system by using the output electric energy, the input energy and the first time period.
2. The method of claim 1, wherein when the initial cell temperature is a target temperature, introducing a cooling fluid into the battery pack comprises:
when the initial cell temperature is the target temperature, acquiring the operation working condition of the cooling system, wherein the operation working condition is a working condition which can be selected when the cooling system operates;
selecting a target test working condition from the operation working conditions, and determining a target flow corresponding to the target test working condition;
and introducing cooling liquid into the battery pack according to the target flow.
3. The method of claim 1, wherein the current cell temperature satisfying a preset stability condition is:
in a preset stable time period, the fluctuation range of the current electric core temperature of the battery pack is smaller than or equal to a preset temperature range; and the fluctuation range of the current cell temperature is obtained by calculation according to the current cell temperature and the historical cell temperature.
4. The method of claim 1, wherein calculating the output electrical energy and the input energy of the battery pack using the output power, the input power, and the first time period comprises:
acquiring input voltage and input current of the battery pack;
calculating the product of the input voltage and the input current to obtain input power;
calculating the integral of the input power and a second time period to obtain the input energy of the battery pack; the second time period is the charging time period of the battery pack in the first time period;
acquiring the output voltage and the output current of the battery pack;
calculating the product of the output voltage and the output current to obtain output power;
calculating the integral of the output power and a third time period to obtain the output electric energy of the battery pack; the third time period is a discharge time period of the battery pack in the first time period.
5. The method of claim 1, wherein said calculating a cooling parameter of a cooling system using said output electrical energy, said input energy, and said first time period comprises:
calculating the difference value between the input energy and the output electric energy to obtain the output heat of the battery pack;
and dividing the output heat by the first time period to obtain the cooling parameter of the cooling system.
6. The method of claim 1, wherein the controlling the battery pack to alternately charge and discharge comprises:
and repeatedly executing control to pulse charge the battery pack in a fourth time period and pulse discharge in a fifth time period.
7. A cooling parameter determination apparatus of a cooling system, characterized in that the apparatus comprises:
the first acquisition unit is used for acquiring the initial cell temperature of the battery pack;
the execution unit is used for introducing cooling liquid into the battery pack when the initial battery core temperature is the target temperature; the temperature of the cooling liquid is consistent with the initial cell temperature;
the control unit is used for controlling the battery pack to alternately charge and discharge;
the second acquisition unit is used for acquiring the current cell temperature of the battery pack;
the third obtaining unit is used for obtaining the output power and the input power of the battery pack in a first time period when the current battery core temperature meets a preset stable condition;
the calculating unit is used for calculating and obtaining a cooling parameter of the cooling system by utilizing the output power, the input power and the first time period;
wherein the calculating unit is configured to calculate a cooling parameter of the cooling system using the output power, the input power, and the first time period, and includes:
the calculating unit is used for calculating the output electric energy and the input energy of the battery pack by using the output power, the input power and the first time period, wherein the input energy is determined based on the integral of the input power and a second time period, and the second time period is the charging time period of the battery pack in the first time period;
and calculating the cooling parameters of the cooling system by using the output electric energy, the input energy and the first time period.
8. A cooling parameter determination apparatus of a cooling system, characterized by comprising: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is to store one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform the method of any of claims 1-6.
9. A computer-readable storage medium having stored therein instructions that, when executed on a terminal device, cause the terminal device to perform the method of any one of claims 1-6.
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