CN111969280A - Temperature control method and device and electronic equipment - Google Patents
Temperature control method and device and electronic equipment Download PDFInfo
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- CN111969280A CN111969280A CN202010872968.9A CN202010872968A CN111969280A CN 111969280 A CN111969280 A CN 111969280A CN 202010872968 A CN202010872968 A CN 202010872968A CN 111969280 A CN111969280 A CN 111969280A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- 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
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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
- H01M10/65—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
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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
- H01M10/65—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
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The embodiment of the invention provides a temperature control method, a temperature control device and electronic equipment, and relates to the technical field of power batteries. According to the temperature control method, the temperature control device and the electronic equipment, after the battery temperature of the battery pack in the battery liquid cooling system and the temperature of the cooling medium in the battery liquid cooling system are obtained, the preset temperature adjusting strategy corresponding to the battery temperature is obtained according to the battery temperature, and the temperature of the battery pack is adjusted according to the temperature adjusting strategy and the temperature of the cooling medium, so that the defect that only the battery temperature is used as a threshold value is avoided, and the energy consumption is effectively reduced.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a temperature control method and device and electronic equipment.
Background
The power battery can generate certain heat in the charging and discharging process to increase the temperature of the storage battery, and the activity of the storage battery can be increased by increasing the temperature of the storage battery, so that the energy of the storage battery can be fully applied. However, if the storage battery works at a high temperature for a long time, heat is not emitted in time, so that the charging and discharging efficiency of the storage battery is influenced, the service life of the storage battery is shortened, and even potential safety hazards are caused. Therefore, the temperature of the battery should be avoided from being excessively high and needs to be controlled within a certain range.
At present, most of battery cooling methods are to control the battery temperature based on a control threshold set by the self-heating characteristics of the battery. However, the cooling mode only considers the temperature of the battery, is single, is difficult to meet the cooling requirements under various working conditions, causes excessive cooling or insufficient cooling, and cannot well save energy.
Disclosure of Invention
Based on the above research, the present invention provides a temperature control method, apparatus and electronic device to improve the above problems.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present invention provides a temperature control method, which is applied to a thermal management system, and the method includes:
acquiring the battery temperature of a battery pack in a battery liquid cooling system and the temperature of a cooling medium in the battery liquid cooling system;
and acquiring a preset temperature adjusting strategy corresponding to the battery temperature according to the battery temperature, and adjusting the temperature of the battery pack according to the temperature adjusting strategy and the temperature of the cooling medium.
In an optional embodiment, the obtaining a preset temperature adjustment strategy corresponding to the battery temperature according to the battery temperature, and the adjusting the temperature of the battery pack according to the temperature adjustment strategy and the temperature of the cooling medium includes:
judging whether the battery temperature is within a set first temperature interval, a set second temperature interval or a set third temperature interval; wherein the lower limit temperature of the first temperature interval is higher than the upper limit temperature of the second temperature interval, and the lower limit temperature of the second temperature interval is higher than the upper limit temperature of the third temperature interval;
if the temperature of the battery pack is within the first temperature interval, acquiring a first temperature adjusting strategy corresponding to the first temperature interval, and adjusting the temperature of the battery pack according to the first temperature adjusting strategy and the temperature of the cooling medium;
if the temperature of the battery pack is within the second temperature interval, acquiring a second temperature adjusting strategy corresponding to the second temperature interval, and adjusting the temperature of the battery pack according to the second temperature adjusting strategy and the temperature of the cooling medium;
and if the temperature of the battery pack is within the third temperature interval, acquiring a third temperature regulation strategy corresponding to the third temperature interval, and regulating the temperature of the battery pack according to the third temperature regulation strategy and the temperature of the cooling medium.
In an alternative embodiment, the step of adjusting the temperature of the battery pack according to the first temperature adjustment strategy and the temperature of the cooling medium includes:
judging whether the temperature of the cooling medium is lower than a first preset temperature or not, if not, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the battery pack is higher than the first preset temperature, the condensing equipment of the battery liquid cooling system is controlled to run at the maximum power, the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed, and therefore the temperature of the battery pack is adjusted.
In an optional embodiment, the step of controlling the condensing device of the battery liquid cooling system to operate at a maximum power and controlling the water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a maximum rotation speed includes:
judging whether the temperature of the battery is higher than a set temperature or not, if so, reducing the working power of the battery pack according to a set proportion, controlling a condensing device of the battery liquid cooling system to operate at the maximum cooling power, and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at the maximum rotating speed; wherein the set temperature is within the first temperature interval;
and if the temperature is not higher than the set temperature, controlling the condensing equipment of the battery liquid cooling system to operate at the maximum cooling power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at the maximum rotating speed.
In an alternative embodiment, the step of adjusting the temperature of the battery pack according to the second temperature adjustment strategy and the temperature of the cooling medium includes:
judging whether the temperature of the cooling medium is lower than a second preset temperature or not, if not, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the cooling medium is higher than the second preset temperature, judging whether the temperature of the cooling medium is higher than a fourth preset temperature;
if the temperature of the battery pack is not higher than the fourth preset temperature, controlling a condensing device of the battery liquid cooling system to operate at a second set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a second set rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the battery pack is higher than the fourth preset temperature, the condensing equipment of the battery liquid cooling system is controlled to operate at the maximum cooling power, the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed, and therefore the temperature of the battery pack is adjusted.
In an alternative embodiment, before determining whether the temperature of the cooling medium is less than a second preset temperature, the method further comprises:
judging whether the battery temperature at the previous moment is within a set first temperature interval, and if so, adjusting the temperature of the battery pack according to the first temperature adjusting strategy and the temperature of the cooling medium;
and if not, judging whether the temperature of the cooling medium is less than the second preset temperature or not.
In an alternative embodiment, the step of adjusting the temperature of the battery pack according to the third temperature adjustment strategy and the temperature of the cooling medium includes:
judging whether the temperature of the cooling medium is lower than a third preset temperature or not, if not, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the cooling medium is higher than the third preset temperature, judging whether the temperature of the cooling medium is lower than the fourth preset temperature;
if the temperature difference between the batteries in the battery pack is lower than the fourth preset temperature, judging whether the temperature difference between the batteries in the battery pack exceeds a set temperature difference, and if the temperature difference does not exceed the set temperature difference, judging whether the battery pack is charged;
if the battery pack is charged, controlling the condensing equipment of the battery liquid cooling system to operate at a second set power and controlling the water pump of the battery liquid cooling system to operate at a maximum rotating speed, and if the battery pack is not charged, controlling the condensing equipment of the battery liquid cooling system to operate at a first set power and controlling the water pump of the battery liquid cooling system to operate at a first set rotating speed;
if the temperature difference exceeds the set temperature difference, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow speed of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the battery pack is higher than the fourth preset temperature, the condensing equipment of the battery liquid cooling system is controlled to operate at a second set power, the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed, and therefore the temperature of the battery pack is adjusted.
In an optional embodiment, the first preset temperature is lower than the second preset temperature, the second preset temperature is lower than the third preset temperature, and the third preset temperature is lower than the fourth preset temperature;
the first set power is smaller than the second set power, and the second set power is smaller than the maximum power;
the first set rotation speed is less than the second set rotation speed, and the second set rotation speed is less than the maximum rotation speed.
In a second aspect, an embodiment of the present invention provides a temperature control device, which is applied to a thermal management system, where the temperature control device includes a temperature obtaining module and a temperature adjusting module;
the temperature acquisition module is used for acquiring the battery temperature of a battery pack in the battery liquid cooling system and the temperature of a cooling medium in the battery liquid cooling system;
the temperature adjusting module is used for acquiring a preset temperature adjusting strategy corresponding to the battery temperature according to the battery temperature, and adjusting the temperature of the battery pack according to the temperature adjusting strategy and the temperature of the cooling medium.
In a third aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the temperature control method of any of the preceding embodiments when executing the computer program.
In a fourth aspect, an embodiment of the present invention provides a readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to execute the steps of the temperature control method according to any one of the foregoing embodiments.
According to the temperature control method, the temperature control device and the electronic equipment, after the battery temperature of the battery pack in the battery liquid cooling system and the temperature of the cooling medium in the battery liquid cooling system are obtained, the preset temperature adjusting strategy corresponding to the battery temperature is obtained according to the battery temperature, and the temperature of the battery pack is adjusted according to the temperature adjusting strategy and the temperature of the cooling medium, so that the defect that only the battery temperature is used as a threshold value is avoided, and the energy consumption is effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view of a cooling structure of a battery system in the prior art.
Fig. 2 is a flow chart of a cooling strategy in the prior art.
Fig. 3 is a schematic structural diagram of a thermal management system according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart of a temperature control method according to an embodiment of the present invention.
Fig. 5 is another schematic flow chart of a temperature control method according to an embodiment of the present invention.
Fig. 6 is a schematic flow chart of a temperature control method according to an embodiment of the present invention.
Fig. 7 is a block diagram of a temperature control device according to an embodiment of the present invention.
Icon: 100-a thermal management system; 10-temperature control means; 11-a temperature acquisition module; 12-temperature regulating module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
As described in the background art, the power battery generates a certain amount of heat during the charging and discharging process to raise the temperature of the storage battery, and the raising of the temperature of the storage battery can increase the activity of the storage battery, so that the energy of the storage battery can be fully used. However, if the storage battery works at a high temperature for a long time, heat is not emitted in time, so that the charging and discharging efficiency of the storage battery is influenced, the service life of the storage battery is shortened, and even potential safety hazards are caused. Therefore, the temperature of the battery should be avoided from being excessively high and needs to be controlled within a certain range.
At present, the hybrid power battery system adopts air cooling, water cooling and oil cooling modes to cool the battery pack. The air cooling mode does not need complex pipeline layout, but has limited heat dissipation capacity and uneven heat dissipation, and has higher requirements on the overall structure design of the battery pack. The oil cooling mode has good heat dissipation capacity and can uniformly dissipate heat, but the design of the oil cooling device is more complex and the cost is higher. The water cooling mode has good heat dissipation capability and is easy to realize, and is a common part cooling mode in the field of automobiles.
Referring to fig. 1, fig. 1 is a water cooling system in the prior art. As shown in fig. 1, a water cooling plate in the cooling system is installed at the bottom of the battery module, and excess heat of the module is taken away by cooling liquid circulating in a pipeline to cool the module.
The cooling strategy of the prior art is to control the battery temperature based on the heating characteristics of the battery itself by setting a control threshold. When the temperature of the battery is too high and needs to be cooled, a cooling request is sent, and when a thermal management system (such as an automobile thermal management system) receives the cooling request, a water pump is controlled to be started in response to the cooling request, so that cooling liquid in a pipeline of the battery cooling system starts to circularly flow, and heat emitted by surrounding modules is absorbed. When the temperature of the module is reduced to the target value, the electronic water pump is turned off, the cooling is finished, and the control strategy can be shown in fig. 2.
However, the cooling strategy in the prior art has the following defects that (1) the actual operation working conditions are complicated and changeable, so that the temperature of the working environment of the battery is changed frequently, and therefore the cooling control of the battery pack is greatly influenced. (2) If the power battery system works in a high-temperature environment, the cooling speed of the cooling liquid is low, and the cooling efficiency and the working efficiency of the power battery are affected. (3) Neglecting the influence of the cooling liquid temperature, only considering the battery temperature, resulting in excessive cooling or insufficient cooling.
Based on the above research, the present embodiment provides a temperature control method to improve the above problem.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a thermal management system according to the present embodiment, and the temperature control method according to the present embodiment is applied to the thermal management system 100 shown in fig. 3 and executed by the controller in fig. 3, where the thermal management system may be an automobile thermal management system.
As shown in fig. 3, the thermal management system 100 includes a battery liquid cooling system, a second water pump, and a controller. The battery liquid cooling system comprises a battery pack, a first water pump, a cooling medium loop, a compressor, a condenser, a heat exchanger and a plurality of temperature sensors, wherein the compressor, the condenser and the heat exchanger form condensing equipment. In this embodiment, a plurality of temperature sensors are respectively disposed at the water inlet and the water outlet of the battery pack and the cooling medium loop, and are respectively configured to obtain the temperature of the battery, the temperature of the water inlet of the cooling medium, and the temperature of the water outlet of the cooling medium, and feed back the obtained temperature of the battery, the obtained temperature of the water inlet of the cooling medium, and the obtained temperature of the water outlet of the cooling medium to the controller. The controller acquires a preset temperature regulation strategy corresponding to the battery temperature according to the battery temperature, and then adjusts the temperature of the battery pack according to the temperature regulation strategy and the temperature of the cooling medium, namely, the operation of the compressor, the condenser, the first water pump, the second water pump and the heat exchanger is controlled. For example, when the controller receives the temperature fed back by the temperature sensor and needs to reduce the temperature, the controller firstly controls the compressor, the condenser and the second water pump to start to operate to reduce the temperature of the whole vehicle environment, then controls the first water pump and the heat exchanger to operate to enable the cooling medium in the cooling medium loop to exchange heat with external cold fluid, and the cooled low-temperature cooling medium enters the battery pack to reduce the temperature of the battery pack.
It will be appreciated that the configuration shown in FIG. 3 is merely illustrative and that the thermal management system 100 may include more or fewer components than shown in FIG. 3 or may have a different configuration than shown in FIG. 3. The components shown in fig. 3 may be implemented in hardware, software, or a combination thereof.
Based on the implementation architecture illustrated in fig. 3, please refer to fig. 4, fig. 4 is a flowchart illustrating a temperature control method provided in this embodiment, which is executed by a controller in a thermal management system, and the flowchart illustrated in fig. 4 is described in detail below.
Step S10: and acquiring the battery temperature of a battery pack in the battery liquid cooling system and the temperature of a cooling medium in the battery liquid cooling system.
Step S20: and acquiring a preset temperature adjusting strategy corresponding to the battery temperature according to the battery temperature, and adjusting the temperature of the battery pack according to the temperature adjusting strategy and the temperature of the cooling medium.
According to the temperature control method provided by the embodiment, after the battery temperature of the battery pack in the battery liquid cooling system and the temperature of the cooling medium in the battery liquid cooling system are obtained, the preset temperature regulation strategy corresponding to the battery temperature is obtained according to the battery temperature, and the temperature of the battery pack is adjusted according to the temperature regulation strategy and the temperature of the cooling medium, so that the influence of the battery temperature and the temperature of the cooling medium on the battery liquid cooling system is comprehensively considered, the defect that only the battery temperature is used as a threshold value is avoided, and the energy consumption is effectively reduced.
Optionally, in this embodiment, the acquired temperature of the cooling medium may be a water inlet temperature of the cooling medium.
Optionally, different temperature adjustment strategies are correspondingly set for different battery temperatures, so in this embodiment, according to the battery temperature, a preset temperature adjustment strategy corresponding to the battery temperature is obtained, and according to the temperature adjustment strategy and the temperature of the cooling medium, the step of adjusting the temperature of the battery pack includes:
judging whether the battery temperature is within a set first temperature interval, a set second temperature interval or a set third temperature interval; wherein the lower limit temperature of the first temperature interval is higher than the upper limit temperature of the second temperature interval, and the lower limit temperature of the second temperature interval is higher than the upper limit temperature of the third temperature interval.
And if the temperature of the battery pack is within the first temperature interval, acquiring a first temperature adjusting strategy corresponding to the first temperature interval, and adjusting the temperature of the battery pack according to the first temperature adjusting strategy and the temperature of the cooling medium.
And if the temperature of the battery pack is within the second temperature interval, acquiring a second temperature regulation strategy corresponding to the second temperature interval, and regulating the temperature of the battery pack according to the second temperature regulation strategy and the temperature of the cooling medium.
And if the temperature of the battery pack is within the third temperature interval, acquiring a third temperature regulation strategy corresponding to the third temperature interval, and regulating the temperature of the battery pack according to the third temperature regulation strategy and the temperature of the cooling medium.
The lower limit temperature of the first temperature interval is higher than the upper limit temperature of the second temperature interval, and the lower limit temperature of the second temperature interval is higher than the upper limit temperature of the third temperature interval, so that the first temperature interval > the second temperature interval > the third temperature interval.
Optionally, in this embodiment, the first temperature interval is 45 ℃ to 55 ℃, the second temperature interval is 35 ℃ to 45 ℃, and the third temperature interval is 25 ℃ to 35 ℃. When the temperature of the battery is in a first temperature interval, the temperature of the battery is high, the service life of the battery is damaged by continuous use, the performance of the battery is reduced, when the temperature of the battery is higher than 55 ℃, the normal service temperature of the battery is exceeded, the service life and the performance of the battery are seriously damaged, the battery can be safely used continuously, when the temperature of the battery is in a second temperature interval, the service life of the battery is lost after long-time use, and when the temperature of the battery is in a third temperature interval, the normal service temperature of the battery is achieved. Therefore, in the present embodiment, temperature intervals are set with the temperature nodes of 55 ℃, 45 ℃, 35 ℃ and 25 ℃, and a corresponding temperature adjustment strategy is set for each temperature interval. When the battery temperature is in different temperature intervals, different temperature regulation strategies are operated, and energy can be saved while the battery temperature is controlled.
Referring to fig. 5 and fig. 6, the process of adjusting the temperature of the battery pack according to the temperature adjustment strategy corresponding to the battery temperature and the temperature of the cooling medium may include:
when the temperature of the battery is within the first temperature interval, whether the temperature of the cooling medium is lower than a first preset temperature or not is judged, if the temperature of the cooling medium is not higher than the first preset temperature, the condensing equipment of the battery liquid cooling system is controlled to operate at a first set power, and the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack.
If the temperature of the battery pack is higher than the first preset temperature, the condensing equipment of the battery liquid cooling system is controlled to run at the maximum power, and the water pump of the battery liquid cooling system is controlled to regulate the flow speed of the cooling medium at the maximum rotating speed so as to regulate the temperature of the battery pack.
Wherein, when the temperature of the battery is in the first temperature interval, the temperature of the battery is higher at the moment, and the temperature of the battery needs to be reduced, if the temperature of the cooling medium is not more than the first preset temperature at the moment, the condensing equipment (i.e. the compressor, the condenser and the heat exchanger) of the battery liquid cooling system may be controlled to operate at a first set power, instead of operating at the maximum power, to save energy, and if the temperature of the cooling medium is higher than the first preset temperature, it means that the temperature of the cooling medium is slightly higher, the temperature reduction is slower, and a rapid temperature reduction is required, so that, when the temperature of the cooling medium is higher than the first preset temperature, and entering a rapid refrigeration control logic, controlling a condensing device of the battery liquid cooling system to regulate the flow speed of a cooling medium at the maximum power and controlling a water pump of the battery liquid cooling system to regulate the maximum rotation speed so as to rapidly cool the battery pack.
In this embodiment, when the condensing device of the battery liquid cooling system is controlled to operate at the maximum power and the water pump of the battery liquid cooling system is controlled to regulate the flow rate of the cooling medium at the maximum rotation speed, it is further required to determine whether the battery temperature is greater than a set temperature, if so, the working power of the battery pack is reduced at a set proportion, and the condensing device of the battery liquid cooling system is controlled to operate at the maximum cooling power and the water pump of the battery liquid cooling system is controlled to regulate the flow rate of the cooling medium at the maximum rotation speed.
And if the temperature is not higher than the set temperature, controlling the condensing equipment of the battery liquid cooling system to operate at the maximum cooling power and controlling the water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at the maximum rotating speed.
The set temperature is within the first temperature range, the set temperature can be 50 ℃, when the temperature of the battery is higher than 50 ℃, the service life of the battery can be damaged if the battery is continuously used, and the performance is reduced, therefore, when the temperature of the battery is higher than 50 ℃, the working power of the battery pack is reduced according to the set proportion, the condensing equipment of the battery liquid cooling system is controlled to operate at the maximum cooling power, the water pump of the battery liquid cooling system is controlled to adjust the flow rate of the cooling medium at the maximum rotating speed, the service power of the battery can be reduced fundamentally, heat generation is reduced, the temperature of the battery pack is reduced at the fastest speed, and the safety of the battery is protected.
Alternatively, in this embodiment, the set ratio may be 20%, and the operating power of the battery pack is reduced by 20%, that is, the power allowed to be discharged from the battery is limited to 80% of the normal power.
As an optional implementation manner, when the temperature of the battery exceeds the first temperature interval, that is, when the temperature of the battery is greater than 55 ℃, the operating temperature of the battery is alarmed, the power emitted by the battery to the outside is reduced, and the power emitted by the battery to the outside is limited to 50% of the normal power, so as to protect the safety of the battery.
And further, when the temperature of the battery is in a second temperature interval, judging whether the temperature of the cooling medium is lower than a second preset temperature, if not, controlling the condensing equipment of the battery liquid cooling system to operate at a first set power and controlling the water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack.
And if the temperature of the cooling medium is higher than the second preset temperature, judging whether the temperature of the cooling medium is higher than a fourth preset temperature.
And if the temperature of the battery pack is not higher than the fourth preset temperature, controlling the condensing equipment of the battery liquid cooling system to operate at a second set power and controlling the water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a second set rotating speed so as to adjust the temperature of the battery pack.
And if the temperature is higher than the fourth preset temperature, controlling the condensing equipment of the battery liquid cooling system to operate at the maximum cooling power and controlling the water pump of the battery liquid cooling system to adjust the flow speed of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack.
Wherein the first preset temperature < the second preset temperature < the third preset temperature < the fourth preset temperature of the cooling medium.
When the battery temperature is in the second temperature range, the long-time use will affect the service life of the battery, so the temperature of the battery also needs to be adjusted. At this time, if the temperature of the cooling medium is lower than the second preset temperature, the temperature and the flow speed of the cooling medium are adjusted by the first set power and the maximum rotating speed, so that the energy consumption is reduced while the temperature of the battery is reduced.
If the temperature of the cooling medium is higher than the second preset temperature, the temperature of the cooling medium is higher, the temperature adjustment is slower, the refrigeration hysteresis control logic is started to judge whether the temperature of the cooling medium is higher than the fourth preset temperature, if the temperature of the cooling medium is not higher than the fourth preset temperature, the condensing equipment of the battery liquid cooling system is controlled to operate at a second set power, the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at a second set rotating speed, and if the temperature of the cooling medium is higher than the fourth preset temperature, the condensing equipment of the battery liquid cooling system is controlled to operate at a maximum cooling power, and the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at a maximum rotating speed, so that the energy consumption.
To further reduce the battery temperature, optionally, before determining whether the temperature of the cooling medium is less than a second preset temperature, the method further includes:
and judging whether the battery temperature at the previous moment is in a set first temperature interval, and if so, adjusting the temperature of the battery pack according to a first temperature adjusting strategy and the temperature of the cooling medium.
And if not, judging whether the temperature of the cooling medium is less than a second preset temperature.
When the battery temperature at the previous moment is in the first temperature interval, the battery pack at the previous moment is still in high-power discharge, although the battery temperature is reduced at the moment, the battery pack still generates large heat and needs rapid refrigeration, and therefore the first temperature regulation strategy is continuously adopted, and the temperature of the battery pack is regulated according to the first temperature regulation strategy and the temperature of the cooling medium.
In order to improve the processing efficiency, in this embodiment, different flag bits may be used for identification of different temperature intervals, for example, a first temperature interval may use a first flag bit, i.e., TMS value 1, a first temperature interval may use a second flag bit, i.e., TMS value 2, and a third temperature interval may use a first flag bit, i.e., TMS value 3. Based on this, whether the battery temperature at the last moment is in the first temperature interval can be judged by judging whether the TMS value is equal to 1, so that the processing efficiency is improved.
And further, when the temperature of the battery is in a third temperature interval, judging whether the temperature of the cooling medium is lower than a third preset temperature, if not, controlling the condensing equipment of the battery liquid cooling system to operate at a first set power and controlling the water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack.
And if the temperature of the cooling medium is higher than the third preset temperature, judging whether the temperature of the cooling medium is lower than a fourth preset temperature.
If the temperature difference between the batteries in the battery pack is lower than the fourth preset temperature, whether the temperature difference between the batteries in the battery pack exceeds the set temperature difference or not is judged, and if the temperature difference does not exceed the set temperature difference, whether the battery pack is charged or not is judged. And if the battery pack is charged, controlling the condensing equipment of the battery liquid cooling system to operate at a second set power and controlling the water pump of the battery liquid cooling system to operate at the maximum rotating speed, and if the battery pack is not charged, controlling the condensing equipment of the battery liquid cooling system to operate at a first set power and controlling the water pump of the battery liquid cooling system to operate at a first set rotating speed.
If the temperature difference exceeds the set temperature difference, the condensing equipment of the battery liquid cooling system is controlled to operate at the first set power, and the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack.
And if the temperature is higher than the fourth preset temperature, controlling the condensing equipment of the battery liquid cooling system to operate at a second set power and controlling the water pump of the battery liquid cooling system to adjust the flow speed of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack.
When the temperature of the battery is within the third temperature range, the battery pack is in a normal working state, at the moment, whether the temperature of the cooling medium is lower than a third preset temperature or not and not higher than the third preset temperature is judged, and then the condensing equipment of the battery liquid cooling system is controlled to operate at a first set power and the water pump of the battery liquid cooling system is controlled to adjust the flow rate of the cooling medium at the maximum rotating speed so as to reduce energy consumption.
If the temperature of the cooling medium is higher than the third preset temperature, the temperature of the cooling medium needs to be adjusted, therefore, when the temperature of the cooling medium is higher than the third preset temperature, temperature balance control logic is adopted to judge whether the temperature of the cooling medium is lower than the fourth preset temperature, if the temperature of the cooling medium is higher than the fourth preset temperature, the temperature of the cooling medium needs to be controlled to control the temperature of the battery pack, and therefore, the condensing equipment of the battery liquid cooling system is controlled to operate at the second set power and the water pump of the battery liquid cooling system is controlled to adjust the flow rate of the cooling medium at the maximum rotating speed to adjust the temperature of the battery pack.
If the temperature difference is lower than the fourth preset temperature, whether the temperature difference between the batteries in the battery pack exceeds the set temperature difference is judged. Wherein, when the difference in temperature between the battery is great, have great performance gap between the different batteries, can arouse the nonconformity of battery, consequently, when the difference in temperature between the battery exceeds when setting for the difference in temperature in the battery package, then the condensing equipment of control battery liquid cooling system adjusts the velocity of flow of cooling medium with the maximum rotational speed with first settlement power operation and the water pump of control battery liquid cooling system to the temperature of adjustment battery package, thereby the difference in temperature between the battery in the regulation battery package.
And when the temperature difference between the batteries in the battery pack does not exceed the set temperature difference, judging whether the battery pack is charged or not.
When the battery pack is charged, the temperature of the battery pack is increased, so that when the battery pack is charged, the condensing equipment of the battery liquid cooling system is controlled to operate at the second set power and the water pump of the battery liquid cooling system is controlled to operate at the maximum rotating speed, and when the battery pack is not charged, the condensing equipment of the battery liquid cooling system is controlled to operate at the first set power and the water pump of the battery liquid cooling system is controlled to operate at the first set rotating speed, so that the energy consumption is reduced.
It should be noted that, in this embodiment, by adjusting the condensing device of the battery liquid cooling system to operate at different powers, not only energy consumption can be reduced, but also the temperature of the cooling medium can be reduced while the temperature of the external environment of the battery pack is reduced, thereby effectively reducing the temperature of the battery pack.
It should be noted that, in this embodiment, the first preset temperature is less than the second preset temperature, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the fourth preset temperature.
The first set power is less than the second set power, and the second set power is less than the maximum power.
The first set rotation speed is less than the second set rotation speed, and the second set rotation speed is less than the maximum rotation speed.
Optionally, in this embodiment, the first preset temperature may be 10 ℃, the second preset temperature may be 15 ℃, the third preset temperature may be 20 ℃, and the fourth preset temperature may be 25 ℃. The first set power may be 0W, the second set power may be 1000W, and the maximum power may be 1800W. The first set rotational speed may be 30% max rotational speed and the second set rotational speed may be 80% max rotational speed.
The temperature control method provided by the embodiment runs different temperature regulation strategies in different stages through the detection of the temperature of the battery and the cooling medium, simultaneously considers the temperature of the cooling liquid and the temperature of the battery, sends different cooling power requests, realizes the intelligent control of the temperature of the battery, can prolong the service life of the battery while ensuring the maximum performance of the battery, runs different temperature regulation strategies in different stages simultaneously, adopts different cooling powers, and effectively reduces the energy consumption.
Based on the same inventive concept, please refer to fig. 7, the present embodiment further provides a temperature control device 10, which is applied to a thermal management system, and particularly to a controller in the thermal management system, wherein the temperature control device 10 includes a temperature obtaining module 11 and a temperature adjusting module 12.
The temperature obtaining module 11 is used for obtaining the battery temperature of the battery pack in the battery liquid cooling system and the temperature of the cooling medium in the battery liquid cooling system.
The temperature adjusting module 12 is configured to obtain a preset temperature adjusting strategy corresponding to the battery temperature according to the battery temperature, and adjust the temperature of the battery pack according to the temperature adjusting strategy and the temperature of the cooling medium.
The temperature obtaining module 11 and the temperature adjusting module 12 are specifically configured to perform the specific processes of the temperature control method described above.
On the basis, the embodiment further provides an electronic device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the temperature control method of any of the preceding embodiments when executing the computer program.
The electronic device may be, but is not limited to, the controller in the thermal management system described above.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatus and electronic device may refer to the corresponding processes in the foregoing method, and will not be described in too much detail herein.
In the temperature control method, the temperature control device and the electronic equipment provided by the embodiment, considering that the temperature of the whole battery liquid cooling system cannot be represented by the imperfect battery temperature serving as the threshold value, the cooling medium serves as an important component of the cooling loop, the temperature of the cooling medium has a great influence on the cooling effect, and the actual state of the battery is comprehensively judged by comprehensively considering the battery temperature and the temperature of the cooling medium, so that a more effective and energy-saving cooling scheme is implemented.
According to the temperature control method, the temperature control device and the electronic equipment, after the battery temperature of the battery pack in the battery liquid cooling system and the temperature of the cooling medium in the battery liquid cooling system are obtained, the preset temperature adjusting strategy corresponding to the battery temperature is obtained according to the battery temperature, and the temperature of the battery pack is adjusted according to the temperature adjusting strategy and the temperature of the cooling medium, so that the defect that only the battery temperature is used as a threshold value is avoided, and the energy consumption is effectively reduced.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A temperature control method is applied to a thermal management system, and comprises the following steps:
acquiring the battery temperature of a battery pack in a battery liquid cooling system and the temperature of a cooling medium in the battery liquid cooling system;
and acquiring a preset temperature adjusting strategy corresponding to the battery temperature according to the battery temperature, and adjusting the temperature of the battery pack according to the temperature adjusting strategy and the temperature of the cooling medium.
2. The temperature control method according to claim 1, wherein the step of obtaining a preset temperature adjustment strategy corresponding to the battery temperature according to the battery temperature, and adjusting the temperature of the battery pack according to the temperature adjustment strategy and the temperature of the cooling medium comprises:
judging whether the battery temperature is within a set first temperature interval, a set second temperature interval or a set third temperature interval; wherein the lower limit temperature of the first temperature interval is higher than the upper limit temperature of the second temperature interval, and the lower limit temperature of the second temperature interval is higher than the upper limit temperature of the third temperature interval;
if the temperature of the battery pack is within the first temperature interval, acquiring a first temperature adjusting strategy corresponding to the first temperature interval, and adjusting the temperature of the battery pack according to the first temperature adjusting strategy and the temperature of the cooling medium;
if the temperature of the battery pack is within the second temperature interval, acquiring a second temperature adjusting strategy corresponding to the second temperature interval, and adjusting the temperature of the battery pack according to the second temperature adjusting strategy and the temperature of the cooling medium;
and if the temperature of the battery pack is within the third temperature interval, acquiring a third temperature regulation strategy corresponding to the third temperature interval, and regulating the temperature of the battery pack according to the third temperature regulation strategy and the temperature of the cooling medium.
3. The temperature control method of claim 2, wherein the step of adjusting the temperature of the battery pack according to the first temperature regulation strategy and the temperature of the cooling medium comprises:
judging whether the temperature of the cooling medium is lower than a first preset temperature or not, if not, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the battery pack is higher than the first preset temperature, the condensing equipment of the battery liquid cooling system is controlled to run at the maximum power, the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed, and therefore the temperature of the battery pack is adjusted.
4. The method of claim 3, wherein the step of controlling a condensing device of the battery liquid cooling system to operate at maximum power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at maximum speed comprises:
judging whether the temperature of the battery is higher than a set temperature, if so, reducing the working power of the battery pack according to a set proportion, controlling a condensing device of the battery liquid cooling system to operate at the maximum power, and controlling a water pump of the battery liquid cooling system to regulate the flow rate of the cooling medium at the maximum rotating speed; wherein the set temperature is within the first temperature interval;
and if the temperature is not higher than the set temperature, controlling the condensing equipment of the battery liquid cooling system to operate at the maximum power and controlling a water pump of the battery liquid cooling system to regulate the flow rate of the cooling medium at the maximum rotating speed.
5. The temperature control method of claim 3, wherein the step of adjusting the temperature of the battery pack according to the second temperature regulation strategy and the temperature of the cooling medium comprises:
judging whether the temperature of the cooling medium is lower than a second preset temperature or not, if not, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the cooling medium is higher than the second preset temperature, judging whether the temperature of the cooling medium is higher than a fourth preset temperature;
if the temperature of the battery pack is not higher than the fourth preset temperature, controlling a condensing device of the battery liquid cooling system to operate at a second set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a second set rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the battery pack is higher than the fourth preset temperature, the condensing equipment of the battery liquid cooling system is controlled to operate at the maximum cooling power, the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed, and therefore the temperature of the battery pack is adjusted.
6. The temperature control method according to claim 5, before determining whether the temperature of the cooling medium is less than a second preset temperature, the method further comprising:
judging whether the battery temperature at the previous moment is within a set first temperature interval, and if so, adjusting the temperature of the battery pack according to the first temperature adjusting strategy and the temperature of the cooling medium;
and if not, judging whether the temperature of the cooling medium is less than the second preset temperature or not.
7. The temperature control method of claim 5, wherein the step of adjusting the temperature of the battery pack according to the third temperature regulation strategy and the temperature of the cooling medium comprises:
judging whether the temperature of the cooling medium is lower than a third preset temperature or not, if not, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow rate of the cooling medium at a maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the cooling medium is higher than the third preset temperature, judging whether the temperature of the cooling medium is lower than the fourth preset temperature;
if the temperature difference between the batteries in the battery pack is lower than the fourth preset temperature, judging whether the temperature difference between the batteries in the battery pack exceeds a set temperature difference, and if the temperature difference does not exceed the set temperature difference, judging whether the battery pack is charged;
if the battery pack is charged, controlling the condensing equipment of the battery liquid cooling system to operate at a second set power and controlling the water pump of the battery liquid cooling system to operate at a maximum rotating speed, and if the battery pack is not charged, controlling the condensing equipment of the battery liquid cooling system to operate at a first set power and controlling the water pump of the battery liquid cooling system to operate at a first set rotating speed;
if the temperature difference exceeds the set temperature difference, controlling a condensing device of the battery liquid cooling system to operate at a first set power and controlling a water pump of the battery liquid cooling system to adjust the flow speed of the cooling medium at the maximum rotating speed so as to adjust the temperature of the battery pack;
if the temperature of the battery pack is higher than the fourth preset temperature, the condensing equipment of the battery liquid cooling system is controlled to operate at a second set power, the water pump of the battery liquid cooling system is controlled to adjust the flow speed of the cooling medium at the maximum rotating speed, and therefore the temperature of the battery pack is adjusted.
8. The temperature control method according to claim 7, wherein the first preset temperature is less than the second preset temperature, the second preset temperature is less than the third preset temperature, and the third preset temperature is less than the fourth preset temperature;
the first set power is smaller than the second set power, and the second set power is smaller than the maximum power;
the first set rotation speed is less than the second set rotation speed, and the second set rotation speed is less than the maximum rotation speed.
9. The temperature control device is applied to a thermal management system and comprises a temperature acquisition module and a temperature regulation module;
the temperature acquisition module is used for acquiring the battery temperature of a battery pack in the battery liquid cooling system and the temperature of a cooling medium in the battery liquid cooling system;
the temperature adjusting module is used for acquiring a preset temperature adjusting strategy corresponding to the battery temperature according to the battery temperature, and adjusting the temperature of the battery pack according to the temperature adjusting strategy and the temperature of the cooling medium.
10. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the temperature control method of any one of claims 1 to 8 when executing the computer program.
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| CN113858955A (en) * | 2021-09-15 | 2021-12-31 | 东风时代(武汉)电池系统有限公司 | BMS control strategy optimization method, device, equipment and readable storage medium |
| CN113871759A (en) * | 2021-09-26 | 2021-12-31 | 恒大新能源汽车投资控股集团有限公司 | Temperature adjusting method and device of battery thermal management system and electronic equipment |
| CN114527158A (en) * | 2022-04-21 | 2022-05-24 | 深圳三思检测技术有限公司 | Efficient Vicat instrument cooling method and device and Vicat softening point testing system |
| CN114552050A (en) * | 2020-11-27 | 2022-05-27 | 中车时代电动汽车股份有限公司 | Battery system thermal management method and thermal management device |
| CN114738264A (en) * | 2022-04-26 | 2022-07-12 | 醴陵千汇实业有限公司 | Quick oil cooling system of plunger pump |
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| CN114527158A (en) * | 2022-04-21 | 2022-05-24 | 深圳三思检测技术有限公司 | Efficient Vicat instrument cooling method and device and Vicat softening point testing system |
| CN114738264A (en) * | 2022-04-26 | 2022-07-12 | 醴陵千汇实业有限公司 | Quick oil cooling system of plunger pump |
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Application publication date: 20201120 |