CN117841769A - Thermal management method and device for power battery, vehicle and storage medium - Google Patents
Thermal management method and device for power battery, vehicle and storage medium Download PDFInfo
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Abstract
The present disclosure relates to the field of power battery technologies, and in particular, to a method and an apparatus for thermal management of a power battery, a vehicle, and a storage medium, where the method includes: detecting the current state of charge and the current temperature of the power battery during charging; predicting the total charging duration and the temperature rise curve of the power battery according to the current state of charge and the current temperature, and calculating the total thermal management duration of the power battery according to the temperature rise curve; and calculating the thermal management starting time according to the total charging time, the total thermal management time and the current time, and starting the thermal management system of the power battery when the current time reaches the starting time. Therefore, the problems that heat dissipation of the power battery is guaranteed through a heat management system with larger refrigeration power in the related art, the cost of the whole vehicle is increased and the like are solved.
Description
Technical Field
The present disclosure relates to the field of power battery technologies, and in particular, to a method and an apparatus for thermal management of a power battery, a vehicle, and a storage medium.
Background
The market share occupied by the pure electric vehicle has been obviously improved in recent years, but the endurance mileage of the pure electric vehicle is a constant problem, and at present, many manufacturers release the problem by increasing the battery capacity continuously, but the problem that the charging time of a high-capacity battery is long or the battery heating value is large due to the adoption of a quick charging technology and cannot be cooled quickly is caused.
In the related art, in order to solve the anxiety of the user on the energy supplement of the new energy automobile, the requirement of high charging multiplying power is provided for the battery, so that the charging time of the battery is reduced by adopting the quick charging technology, but the battery heating value is large and can not be cooled quickly by adopting the quick charging technology, and in order to ensure the thermal safety and the service life of the battery, a thermal management system with larger matched refrigerating power is needed, so that the cost of the whole automobile is further improved.
Disclosure of Invention
The application provides a thermal management method and device of a power battery, a vehicle and a storage medium, and aims to solve the problems that in the related art, heat dissipation of the power battery is guaranteed through a thermal management system with larger refrigeration power, and the cost of the whole vehicle is increased.
An embodiment of a first aspect of the present application provides a thermal management method for a power battery, including the steps of: detecting the current state of charge and the current temperature of the power battery during charging; predicting a total charging duration and a temperature rise curve of the power battery according to the current state of charge and the current temperature, and calculating total thermal management duration of the power battery according to the temperature rise curve; and calculating a thermal management starting time according to the total charging time, the total thermal management time and the current time, and starting the thermal management system of the power battery when the current time reaches the starting time.
Optionally, the calculating the total thermal management duration of the power battery according to the temperature rise curve includes: identifying the highest temperature of the temperature rise curve; calculating the required refrigerating capacity according to the highest temperature and the upper limit temperature of the power battery; and calculating the total thermal management duration according to the required refrigerating capacity and the maximum thermal management refrigerating power.
Optionally, before calculating the total heat management duration according to the required cooling capacity and the maximum heat management cooling power, the method further comprises: acquiring a first corresponding relation table of temperature and maximum refrigeration power; and determining the maximum refrigeration power based on the current temperature and the first corresponding relation table.
Optionally, before calculating the total heat management duration according to the required cooling capacity and the maximum heat management cooling power, the method further comprises: detecting the current refrigeration power of an air conditioner; and correcting the maximum refrigeration power of the thermal management according to the current refrigeration power.
Optionally, before calculating the total thermal management duration of the power battery according to the temperature rise curve, the method further comprises: detecting whether the highest temperature is greater than an upper limit temperature of the power battery; and if the highest temperature is greater than the upper limit temperature, calculating the total thermal management duration of the power battery according to the temperature rise curve, otherwise, starting the thermal management system according to a thermal management starting threshold of the power battery.
Optionally, the predicting the charging total duration and the temperature rise curve of the power battery according to the current state of charge and the current temperature includes: acquiring a second corresponding relation table of the state of charge, the temperature, the total charging duration and the temperature rise curve; and determining the total charging duration and the temperature rise curve of the power battery based on the current state of charge, the current temperature and the second corresponding relation table.
Optionally, before detecting the current state of charge and the current temperature when the power battery is charged, the method further comprises: acquiring charging power of a charging pile; and if the charging power is larger than the preset power, detecting the current state of charge and the current temperature of the power battery during charging, otherwise, starting the thermal management system according to the thermal management starting threshold of the power battery.
Embodiments of a second aspect of the present application provide a thermal management device for a power cell, comprising: the detection module is used for detecting the current state of charge and the current temperature when the power battery is charged; the prediction module is used for predicting the total charge duration and the temperature rise curve of the power battery according to the current charge state and the current temperature, and calculating the total thermal management duration of the power battery according to the temperature rise curve; and the calculation module is used for calculating the thermal management starting time according to the total charging time, the total thermal management time and the current time, and starting the thermal management system of the power battery when the current time reaches the starting time.
An embodiment of a third aspect of the present application provides a vehicle, including: the power battery management system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the power battery management method according to the embodiment.
An embodiment of a fourth aspect of the present application provides a computer-readable storage medium having stored thereon a computer program that is executed by a processor for implementing the method of thermal management of a power cell as described in the above embodiment.
Therefore, the application has at least the following beneficial effects:
according to the method and the device, based on the predicted total charging duration and temperature rise curve of the power battery, the threshold value for starting the thermal management of the power battery is dynamically determined, and the thermal management of the power battery is realized through the threshold value for starting the thermal management of the power battery by means of dynamic adjustment, so that the thermal management problem of the power battery can be solved without matching with a thermal management system with larger refrigeration power, the method and the device can be effectively applied to heat dissipation of the power battery when the high-rate battery is quickly charged, and further the heat dissipation requirement of the power battery is met, and meanwhile the cost of the whole vehicle is reduced.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a method of thermal management of a power cell according to an embodiment of the present application;
FIG. 2 is a flow chart of a method of thermal management of a power cell according to one embodiment of the present application;
FIG. 3 is a block diagram of a thermal management device for a power cell according to an embodiment of the present application;
fig. 4 is a schematic structural view of a vehicle according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
A thermal management method, apparatus, vehicle, and storage medium of a power battery according to embodiments of the present application are described below with reference to the accompanying drawings. Aiming at the problems that in the related art, heat dissipation of a power battery is generally guaranteed through a heat management system with larger refrigeration power and the cost of the whole vehicle is increased, the application provides a heat management method of the power battery. Therefore, the problems that heat dissipation of the power battery is guaranteed through a heat management system with larger refrigeration power in the related art, the cost of the whole vehicle is increased and the like are solved.
Specifically, fig. 1 is a schematic flow chart of a thermal management method of a power battery according to an embodiment of the present application.
As shown in fig. 1, the thermal management method of the power battery includes the steps of:
in step S101, the current state of charge and the current temperature at the time of charging the power battery are detected.
It can be understood that the embodiment of the application can detect the current state of charge of the power battery in a mode of ultrasonic detection and the like, and detect the current temperature of the power battery in a mode of temperature sensor and the like, so that the total charging duration and the temperature rise curve of the power battery can be predicted later.
It should be noted that, the State of Charge is also called SOC (State of Charge) of the battery, which represents a ratio of the remaining power of the power battery to the fully charged power, and is generally a percentage, where soc=0 represents a fully discharged State, and soc=1 represents that the battery is fully charged.
In this embodiment of the present application, before detecting the current state of charge and the current temperature when the power battery is charged, the method further includes: acquiring charging power of a charging pile; if the charging power is larger than the preset power, detecting the current state of charge and the current temperature of the power battery during charging, otherwise, starting the thermal management system according to the thermal management starting threshold of the power battery.
The preset power can be 350kW, and calibration can be performed according to actual conditions; the thermal management initiation threshold may be 35 ℃ or 30 ℃, and may be set according to the type and the requirement of the actual power battery, without specific limitation.
It can be appreciated that, in the embodiment of the present application, whether the current charging pile charges with a high multiplying power according to the actual charging power of the charging pile leads to the temperature rise of the power battery, so that when the charging power is smaller than the preset power, a fixed battery thermal management strategy is adopted, and when the charging power is larger than the preset power, the total charging duration and the temperature rise curve need to be predicted according to the current state of charge and the current temperature when the power battery charges, so that the working condition point of the battery thermal management start can be adjusted later, and the battery charge can be guaranteed to be filled rapidly for a limited time.
It should be noted that the power of the charging piles of different types is different, and the charging piles are generally divided into two categories, namely an alternating current charging pile and a direct current charging pile, wherein the alternating current charging pile is generally 7KW standard, and a 220V power supply is used; the direct current pile, namely the quick charging pile and the super charging pile are generally 15-600KW different, and mainly three-phase voltage of 380V is connected into the direct current pile to realize direct current charging.
The battery thermal management mainly adopts a cooling or heating mode to control the temperature of the power battery according to the temperature change condition of the power battery, solves the problems of thermal runaway and incapability of deep discharge of the battery under the condition of overhigh or overlow temperature, improves the overall performance of the battery, and mainly effectively dissipates heat when the temperature of the battery is higher to prevent the occurrence of thermal runaway events; preheating is carried out when the battery temperature is low, so that the battery temperature is improved, and the charging and discharging performance and safety at low temperature are ensured; the temperature difference in the battery pack is reduced, the local overheating phenomenon is restrained, and the battery at the high temperature position is prevented from being attenuated too fast to reduce the whole service life of the battery pack.
In step S102, a total charge duration and a temperature rise curve of the power battery are predicted according to the current state of charge and the current temperature, and a total thermal management duration of the power battery is calculated according to the temperature rise curve.
It can be understood that, in the embodiment of the present application, the total charging duration and the temperature rise curve of the power battery are predicted according to the current state of charge and the current temperature, so that the temperature change of the power battery during quick charging is predicted, and because the temperatures generated by the power battery are different, the battery thermal management system needs to be started only when the temperature rise curve exceeds the safety range, the total thermal management duration of the power battery needs to be calculated based on the temperature rise curve, so that the thermal management starting time is convenient to be calculated according to the total charging duration, the total thermal management duration and the current time.
It should be noted that, the prediction mode of the charging time and the temperature rise curve can be obtained according to the test data of the battery quick charge, and then the correction is performed according to the history data of the current vehicle quick charge, without specific limitation; the temperature rise curve refers to the temperature change of the power battery during quick charge.
In this embodiment of the present application, before calculating the total thermal management time length of the power battery according to the temperature rise curve, the method further includes: detecting whether the highest temperature is greater than the upper limit temperature of the power battery; if the highest temperature is greater than the upper limit temperature, calculating the total thermal management duration of the power battery according to the temperature rise curve, otherwise, starting the thermal management system according to the thermal management starting threshold of the power battery.
It can be understood that, in the embodiment of the present application, when the highest temperature of the predicted temperature rise curve is greater than the upper limit temperature of the power battery, in order to avoid the influence of the battery life after the battery temperature rises to the limit temperature, the total thermal management duration of the power battery needs to be calculated, so that the power battery is controlled to quickly cool according to the total thermal management duration in the following process.
It should be noted that, charging the battery at too high a temperature may cause evaporation and dehydration of the electrolyte, thereby affecting the life and performance of the battery; meanwhile, the chemical reaction inside the battery is accelerated due to the fact that the temperature is too high, and the problems of overheating, short circuit and the like of the battery are easily caused, so that the total time for starting the thermal management system is required to be judged according to the change of the temperature.
In the embodiment of the application, calculating the total thermal management duration of the power battery according to the temperature rise curve includes: identifying the highest temperature of the temperature rise curve; calculating the required refrigerating capacity according to the highest temperature and the upper limit temperature of the power battery; and calculating the total heat management duration according to the required refrigerating capacity and the maximum refrigerating power of the heat management.
It can be understood that, according to the embodiment of the application, the required refrigeration capacity can be calculated according to the highest temperature of the temperature rise curve and the upper limit temperature of the power battery, so that the temperature of the power battery is quickly reduced according to the required refrigeration capacity, and then the total thermal management duration is calculated according to the required refrigeration capacity and the maximum thermal management refrigeration power, so that the cooling requirement is met in the shortest time, the requirement of the battery on the thermal management instantaneous cooling power is reduced, the invalid heat dissipation requirement is avoided, and the charging efficiency is improved.
Specifically, the calculation formula for calculating the required cooling capacity from the highest temperature and the upper limit temperature of the power battery is:
Q＝c avg m(T pre -T limit )
wherein Q is the battery cooling requirement, c avg Is a flat batteryEqual specific heat capacity, T pre Predicting terminal temperature for battery fast charge, T limit And m is the mass of the power battery, and is the battery limit temperature.
The calculation formula for calculating the total heat management duration according to the required refrigerating capacity and the maximum heat management refrigerating power is as follows:
wherein Q is the battery refrigeration requirement, and P is the battery thermal management refrigeration power.
In the embodiment of the application, before calculating the total heat management duration according to the required refrigeration capacity and the maximum heat management refrigeration power, the method further comprises the following steps: acquiring a first corresponding relation table of temperature and maximum refrigeration power; and determining the maximum refrigeration power based on the current temperature and the first corresponding relation table.
It can be understood that, according to the embodiment of the application, the first corresponding relation table is queried based on the current temperature of the power battery, and the maximum refrigeration power is determined, so that the heat management system is controlled to rapidly cool the power battery according to the current temperature, and the influence on the charging time of the power battery is avoided.
Specifically, the first correspondence table of the temperature and the maximum cooling power may be as shown in the following table 1,
table 1 table of temperature versus maximum refrigeration power
| Temperature (DEG C) | -10 | 0 | 10 | 20 | 30 | 40 |
| Maximum refrigerating power | P1 | P2 | P3 | P3 | P4 | P5 |
Specifically, when the sensor detects that the current temperature of the power battery is 10 ℃, the maximum refrigeration power is P3 through searching the first pair of relation tables.
In the embodiment of the application, before calculating the total heat management duration according to the required refrigeration capacity and the maximum heat management refrigeration power, the method further comprises the following steps: detecting the current refrigeration power of an air conditioner; the maximum cooling power of the thermal management is corrected according to the current cooling power.
It can be appreciated that, in the embodiment of the present application, the current cooling power of the air conditioner is detected, and when the air conditioner is turned on, a part of cooling power is consumed, so that the maximum cooling power of the thermal management is reduced, and therefore, the maximum cooling power of the thermal management needs to be corrected according to the current cooling power.
In the embodiment of the application, predicting the total charging duration and the temperature rise curve of the power battery according to the current state of charge and the current temperature includes: acquiring a second corresponding relation table of the state of charge, the temperature, the total charging duration and the temperature rise curve; and determining the total charging duration and the temperature rise curve of the power battery based on the current state of charge, the current temperature and the second corresponding relation table.
It can be understood that, in the embodiment of the present application, since the current state of charge represents the remaining power of the power battery, the charging duration of the power battery may be affected according to different temperatures, so that the total charging duration and the temperature rise curve of the power battery may be determined by looking up a table in a pre-calibrated manner.
For example, detecting soc=0.6 indicates that the power battery is about to be charged by 40%, but the charging time of the power battery may be affected by the fact that the temperature of the power battery is too high to reach 30 ℃ due to the fast charging, and the charging time of the power battery is 20 minutes by searching the corresponding relation table, which is not particularly limited.
In step S103, a thermal management start time is calculated according to the total charging time, the total thermal management time and the current time, and the thermal management system of the power battery is started when the current time reaches the start time.
It can be understood that, in the embodiment of the application, the thermal management starting time is calculated according to the total charging time, the total thermal management time and the current time, and the thermal management system of the power battery is started when the current time reaches the starting time, so that the threshold value of the thermal management starting of the battery is dynamically adjusted according to actual conditions, the thermal management system with larger refrigeration power does not need to be matched, the problem that the battery heat production capacity is huge when the high-rate battery is quickly charged can be solved by dynamically adjusting the threshold value of the thermal management starting of the battery, and the cost of the whole vehicle is reduced.
According to the thermal management method for the power battery, which is provided by the embodiment of the application, the threshold value for the thermal management start of the dynamic adjustment battery is dynamically determined based on the predicted total charging duration and temperature rise curve of the power battery, and the thermal management of the power battery is realized by dynamically adjusting the threshold value for the thermal management start of the battery, so that the thermal management problem of the power battery can be solved without matching a thermal management system with larger refrigeration power, the thermal management method can be effectively applied to heat dissipation of the power battery when the high-power battery is quickly charged, and further the cost of the whole vehicle is reduced while the heat dissipation requirement of the power battery is met.
The thermal management method of the power battery will be described in detail with reference to fig. 2, and the specific steps are as follows:
the first step: and judging whether the pile is an overcharging pile (the overcharging pile is a charging pile with the charging power larger than 350kW and can be specifically calibrated), if the pile is not the overcharging pile, controlling according to a battery heat pipe strategy with a fixed threshold value, namely, after the temperature of the battery exceeds a certain temperature threshold value, sending a refrigeration requirement by the battery, and starting the battery heat management. If the pile is judged to be overcharged, the battery is quickly started to enter a second step;
and a second step of: and (3) estimating the charging time and the temperature rise curve of the battery according to the current SOC and the temperature of the battery, acquiring the charging time and the temperature rise curve according to the test data of the quick charge of the battery, and correcting according to the historical data of the quick charge of the current vehicle.
And a third step of: and judging whether the temperature rise curve of the predicted battery exceeds the upper temperature limit of the battery, if not, controlling according to a battery heat pipe strategy with a fixed threshold value, and if so, entering a fourth step.
Fourth step: the refrigerating capacity requirement of the battery is calculated according to the predicted temperature value of the battery exceeding the upper temperature limit,
Q＝c avg m(T pre -T limit )
q is the battery cooling demand, c avg For the average specific heat capacity of the battery, T pre Predicting terminal temperature for battery fast charge, T limit And m is the mass of the power battery, and is the battery limit temperature.
Fifth step: calculating the total time length of the battery thermal management starting according to the battery demand refrigeration quantity and the battery thermal management refrigeration power,
wherein Q is the battery refrigeration requirement, and P is the battery thermal management refrigeration power.
And looking up the obtained total refrigeration power according to the ambient temperature, obtaining table data through test, wherein if the passenger cabin air conditioner is not started, the total battery refrigeration power is the thermal management total refrigeration power, and if the passenger cabin air conditioner is started, the table data is corrected according to the experience coefficient.
| Temperature (DEG C) | -10 | 0 | 10 | 20 | 30 | 40 |
| Refrigerating power | P1 | P2 | P3 | P3 | P4 | P5 |
Sixth step: and judging the time point of starting the battery thermal management according to the total time length and the quick charge time of the starting of the battery thermal management, and controlling the starting of the battery thermal management according to the time point.
Therefore, the method and the device dynamically adjust the threshold value of battery thermal management starting by estimating the temperature change of the battery during quick charging, and solve the problem that the battery charging time is influenced after the battery temperature rises to the limit temperature due to huge battery heat generation amount during quick charging of the high-rate battery.
Next, a thermal management device of a power battery according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 3 is a block schematic diagram of a thermal management device of a power cell according to an embodiment of the present application.
As shown in fig. 3, the thermal management device 10 of the power cell includes: the detection module 100, the prediction module 200 and the calculation module 300.
The detection module 100 is used for detecting the current state of charge and the current temperature when the power battery is charged; the prediction module 200 is configured to predict a total charging duration and a temperature rise curve of the power battery according to the current state of charge and the current temperature, and calculate a total thermal management duration of the power battery according to the temperature rise curve; the calculation module 300 is configured to calculate a thermal management start time according to the total charging time, the total thermal management time, and the current time, and start the thermal management system of the power battery when the current time reaches the start time.
In the embodiment of the present application, the prediction module 200 is further configured to: identifying the highest temperature of the temperature rise curve; calculating the required refrigerating capacity according to the highest temperature and the upper limit temperature of the power battery; and calculating the total heat management duration according to the required refrigerating capacity and the maximum refrigerating power of the heat management.
In the embodiment of the present application, the prediction module 200 is further configured to: acquiring a first corresponding relation table of temperature and maximum refrigeration power; and determining the maximum refrigeration power based on the current temperature and the first corresponding relation table.
In the embodiment of the present application, the prediction module 200 is further configured to: before calculating the total heat management duration according to the required refrigeration capacity and the maximum refrigeration power of the heat management, the method further comprises: detecting the current refrigeration power of an air conditioner; the maximum cooling power of the thermal management is corrected according to the current cooling power.
In the embodiment of the present application, the prediction module 200 is further configured to: detecting whether the highest temperature is greater than the upper limit temperature of the power battery; if the highest temperature is greater than the upper limit temperature, calculating the total thermal management duration of the power battery according to the temperature rise curve, otherwise, starting the thermal management system according to the thermal management starting threshold of the power battery.
In the embodiment of the present application, the prediction module 200 is further configured to: acquiring a second corresponding relation table of the state of charge, the temperature, the total charging duration and the temperature rise curve; and determining the total charging duration and the temperature rise curve of the power battery based on the current state of charge, the current temperature and the second corresponding relation table.
In the embodiment of the present application, the detection module 100 is further configured to: acquiring charging power of a charging pile; if the charging power is larger than the preset power, detecting the current state of charge and the current temperature of the power battery during charging, otherwise, starting the thermal management system according to the thermal management starting threshold of the power battery.
It should be noted that the foregoing explanation of the embodiment of the thermal management method of the power battery is also applicable to the thermal management device of the power battery of this embodiment, and will not be repeated here.
According to the thermal management device for the power battery, provided by the embodiment of the application, the threshold value for the thermal management start of the dynamic adjustment battery is dynamically determined based on the predicted total charging duration and temperature rise curve of the power battery, and the thermal management of the power battery is realized by dynamically adjusting the threshold value for the thermal management start of the battery, so that the thermal management problem of the power battery can be solved without matching with a thermal management system with larger refrigeration power, the thermal management device can be effectively applied to heat dissipation of the power battery when the high-rate battery is quickly charged, and further, the cost of the whole vehicle is reduced while the heat dissipation requirement of the power battery is met.
Fig. 4 is a schematic structural diagram of a vehicle according to an embodiment of the present application. The vehicle may include:
memory 401, processor 402, and a computer program stored on memory 401 and executable on processor 402.
The processor 402 implements the thermal management method of the power cell provided in the above embodiment when executing the program.
Further, the vehicle further includes:
a communication interface 403 for communication between the memory 401 and the processor 402.
A memory 401 for storing a computer program executable on the processor 402.
The memory 401 may include high speed RAM (Random Access Memory ) memory, and may also include non-volatile memory, such as at least one disk memory.
If the memory 401, the processor 402, and the communication interface 403 are implemented independently, the communication interface 403, the memory 401, and the processor 402 may be connected to each other by a bus and perform communication with each other. The bus may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component, external device interconnect) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 4, but not only one bus or one type of bus.
Alternatively, in a specific implementation, if the memory 401, the processor 402, and the communication interface 403 are integrated on a chip, the memory 401, the processor 402, and the communication interface 403 may perform communication with each other through internal interfaces.
The processor 402 may be a CPU (Central Processing Unit ) or ASIC (Application Specific Integrated Circuit, application specific integrated circuit) or one or more integrated circuits configured to implement embodiments of the present application.
Embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of thermal management of a power cell as above.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable gate arrays, field programmable gate arrays, and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. A method of thermal management of a power cell, comprising the steps of:
detecting the current state of charge and the current temperature of the power battery during charging;
predicting a total charging duration and a temperature rise curve of the power battery according to the current state of charge and the current temperature, and calculating total thermal management duration of the power battery according to the temperature rise curve;
and calculating a thermal management starting time according to the total charging time, the total thermal management time and the current time, and starting the thermal management system of the power battery when the current time reaches the starting time.
2. The method of thermal management of a power cell of claim 1, wherein said calculating a total thermal management length of the power cell from the temperature rise profile comprises:
identifying the highest temperature of the temperature rise curve;
calculating the required refrigerating capacity according to the highest temperature and the upper limit temperature of the power battery;
and calculating the total thermal management duration according to the required refrigerating capacity and the maximum thermal management refrigerating power.
3. The method of thermal management of a power cell according to claim 2, further comprising, before calculating the total thermal management time period from the required cooling capacity and a thermally managed maximum cooling power:
acquiring a first corresponding relation table of temperature and maximum refrigeration power;
and determining the maximum refrigeration power based on the current temperature and the first corresponding relation table.
4. A method of thermal management of a power cell according to claim 2 or 3, further comprising, prior to calculating the total thermal management time period from the required cooling capacity and a thermally managed maximum cooling power:
detecting the current refrigeration power of an air conditioner;
and correcting the maximum refrigeration power of the thermal management according to the current refrigeration power.
5. The method of thermal management of a power cell of claim 2, further comprising, prior to calculating a total thermal management length of the power cell from the temperature rise profile:
detecting whether the highest temperature is greater than an upper limit temperature of the power battery;
and if the highest temperature is greater than the upper limit temperature, calculating the total thermal management duration of the power battery according to the temperature rise curve, otherwise, starting the thermal management system according to a thermal management starting threshold of the power battery.
6. The method of thermal management of a power cell of claim 1, wherein predicting a total length of charge and a temperature rise profile of the power cell based on the current state of charge and the current temperature comprises:
acquiring a second corresponding relation table of the state of charge, the temperature, the total charging duration and the temperature rise curve;
and determining the total charging duration and the temperature rise curve of the power battery based on the current state of charge, the current temperature and the second corresponding relation table.
7. The method of thermal management of a power cell of claim 1, further comprising, prior to detecting a current state of charge and a current temperature of the power cell as it is charged:
acquiring charging power of a charging pile;
and if the charging power is larger than the preset power, detecting the current state of charge and the current temperature of the power battery during charging, otherwise, starting the thermal management system according to the thermal management starting threshold of the power battery.
8. A thermal management device for a power cell, comprising:
the detection module is used for detecting the current state of charge and the current temperature when the power battery is charged;
the prediction module is used for predicting the total charge duration and the temperature rise curve of the power battery according to the current charge state and the current temperature, and calculating the total thermal management duration of the power battery according to the temperature rise curve;
and the calculation module is used for calculating the thermal management starting time according to the total charging time, the total thermal management time and the current time, and starting the thermal management system of the power battery when the current time reaches the starting time.
9. A vehicle, characterized by comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the method of thermal management of a power cell as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor for implementing a method of thermal management of a power cell according to any one of claims 1-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410116852.0A CN117841769A (en) | 2024-01-26 | 2024-01-26 | Thermal management method and device for power battery, vehicle and storage medium |
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| CN202410116852.0A CN117841769A (en) | 2024-01-26 | 2024-01-26 | Thermal management method and device for power battery, vehicle and storage medium |
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| CN202410116852.0A Pending CN117841769A (en) | 2024-01-26 | 2024-01-26 | Thermal management method and device for power battery, vehicle and storage medium |
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