CN116937017A - Thermal management control method and constant temperature device - Google Patents
Thermal management control method and constant temperature device Download PDFInfo
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- 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
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Abstract
The embodiment of the application provides a thermal management control method and a constant temperature device. The control method comprises the following steps: acquiring the required temperature Ts of the energy storage system; acquiring the temperature T1 of heat exchange liquid of the constant temperature device; calculating a temperature deviation E at intervals of preset time DT at least according to the required temperature Ts and the heat exchange liquid temperature T1; based at least on the temperature deviation E, the historical heat exchange demand P of the energy storage system T‑1 Calculating the current heat exchange demand P T The method comprises the steps of carrying out a first treatment on the surface of the And controlling the output capacity of the constant temperature device according to the current heat exchange requirement. The control method can timely acquire the current heat exchange requirement of the energy storage system, so that the temperature of the energy storage system is controlled.
Description
[ field of technology ]
The present application relates to the field of thermal management technologies, and in particular, to a thermal management control method and a thermostat device for an energy storage system.
[ background Art ]
The energy storage is to store energy, and the energy storage in the aspect of clean energy is to store the electric energy in various modes, so that the relation between electric energy supply is balanced, the electric energy is released when needed, and the electric energy is stored when not needed, so that the aim of making the best use of things is finally achieved. The electrochemical energy storage in China is particularly outstanding as the lithium battery energy storage, and has the advantages of high controllability, high modularization degree, high energy density, high conversion efficiency and gradually increased duty ratio. In recent years, the market demand for lithium battery capacity is increasing, but the application space is limited, which promotes the development of lithium battery capacity to high units and the development of arrangement to compactness. And a large amount of heat can be generated in the use process of the high-capacity lithium battery, and the heat is accumulated for a long time, so that the internal temperature of the lithium battery is increased, the attenuation of the battery capacity is accelerated, and the service life of the battery is reduced. If the temperature continues to rise to a certain level, even decomposition reaction occurs inside the battery, and explosion and fire may occur.
[ application ]
In view of the above, the embodiment of the application provides a thermal management control method and a constant temperature device, which can control the temperature of an energy storage system.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
a thermal management control method for controlling the temperature of an energy storage system by a thermostat, comprising the steps of:
acquiring the required temperature Ts of the energy storage system;
acquiring the temperature T1 of heat exchange liquid of the constant temperature device;
calculating a temperature deviation E at intervals of preset time DT at least according to the required temperature Ts and the heat exchange liquid temperature T1;
based at least on the temperature deviation E, the historical heat exchange demand P of the energy storage system T-1 Calculating the current heat exchange demand P T ；
And controlling the output capacity of the constant temperature device according to the current heat exchange requirement.
According to the control method, the required temperature of the energy storage system and the temperature of the heat exchange liquid are obtained, the temperature deviation is calculated, the current heat exchange requirement is adjusted according to the temperature deviation and the historical heat exchange requirement, and the output capacity of the constant temperature device is controlled according to the current heat exchange requirement, so that the constant temperature device can adjust output according to the current heat exchange requirement of the energy storage system, and the temperature control of the energy storage system is realized.
The embodiment of the application also provides a constant temperature device for controlling the temperature of the energy storage system, which comprises a compressor and a control module, wherein the control module is used for controlling the compressor; the control module further comprises a temperature acquisition unit, a temperature acquisition unit and a processor; the temperature acquisition unit and the temperature acquisition unit are respectively and electrically connected with the processor; wherein:
the temperature acquisition unit is used for acquiring the required temperature Ts of the energy storage system;
the temperature acquisition unit is used for acquiring the temperature T1 of the heat exchange liquid of the constant temperature device;
the processor: the temperature deviation E is calculated at intervals of preset time DT at least according to the required temperature Ts and the heat exchange liquid temperature T1; based at least on the temperature deviation E, the historical heat exchange demand P of the energy storage system T-1 Calculating the current heat exchange demand P T The method comprises the steps of carrying out a first treatment on the surface of the And controlling the output capacity of the constant temperature device according to the current heat exchange requirement.
The constant temperature device can calculate the current heat exchange demand according to the historical heat exchange demand of the energy storage system, the demand temperature of the energy storage system, the temperature of heat exchange liquid and other information, and control the output capacity according to the current heat exchange demand, so that the temperature control of the energy storage system is realized.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a thermal management control method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a circuit connection between a thermostat and an energy storage system;
FIG. 3 is a schematic diagram of a thermostat and energy storage system;
fig. 4 is a flowchart of another thermal management control method according to an embodiment of the present application.
[ detailed description ] of the application
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be understood that the term "and/or" as used herein is merely one way of describing an association of associated objects, meaning that there may be three relationships, e.g., a and/or b, which may represent: the first and second cases exist separately, and the first and second cases exist separately. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
With the development of energy storage systems, the demand for constant temperature devices is increasing; the constant temperature device controls and outputs refrigerating capacity or heating capacity according to the outlet temperature of the battery pack heat exchange liquid of the energy storage system, so that the battery pack is refrigerated or heated. The current heat exchange liquid temperature is too high and is used for refrigerating, and the current heat exchange liquid temperature is too low and is used for heating, so that the battery pack is in a relatively proper temperature environment, and the safety, reliability and service life of the battery pack can be improved.
The constant temperature device controls and outputs the refrigerating capacity and the heating capacity according to the outlet temperature of the heat exchange liquid, so as to refrigerate or heat the battery pack. This control scheme may be as follows:
1. when the energy storage modules with different capacities are combined together to form the energy storage system, the battery pack of each energy storage module works, and the heat productivity is different due to the different capacities of the energy storage modules, so that the required refrigerating capacity is different. Taking the constant temperature device for refrigerating the energy storage system as an example, at this time, if the constant temperature device only performs output control according to the outlet temperature of the heat exchange liquid, the temperature of the heat exchange liquid of the energy storage module with small capacity is lower, the optimal temperature point of the battery pack is deviated, the refrigerating capacity is wasted, and the running cost is increased. The temperature of the unit cooling liquid with large capacity is higher, and the unit cooling liquid can deviate from the optimal temperature point of the battery pack, so that the heat exchange effect is poor, and the battery pack cannot be cooled more effectively.
2. Because the operating period of the energy storage system is not fixed, the operation is generally carried out according to the need, and the constant temperature device works according to the maximum heat release amount of the whole energy storage system when being matched, the constant temperature device controls according to the outlet temperature of the heat exchange liquid when the output capacity, so that when only part of the energy storage system works, the output capacity of the constant temperature device is overhigh, the temperature of the heat exchange liquid can be quickly reduced to the shutdown temperature, the constant temperature device is stopped, the temperature fluctuation of a battery pack is caused, and the operation life of the energy storage system is influenced.
Based on this, an embodiment of the present application provides a thermal management control method, which is suitable for controlling the temperature of an energy storage system by a thermostat, as shown in fig. 1, and includes the following steps:
s11: and acquiring the demand temperature Ts of the energy storage system. A general energy storage system includes a battery pack and a BMS (battery management system) for battery management; the battery management system is mainly used for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery, monitoring the state of the battery, and is provided with a communication unit which can communicate with a constant temperature device, and sends the required temperature Ts of the energy storage system to the constant temperature device, wherein the required temperature Ts of the specific energy storage system is related to parameters such as the discharging speed/charging speed/battery capacity of the battery, and the required temperature Ts is acquired by the BMS according to the state of the battery.
S12: the heat exchange liquid temperature T1 of the constant temperature device is obtained. Specifically, the constant temperature device controls the temperature of the heat exchange liquid, and the controlled heat exchange liquid with proper temperature flows to the energy storage system to cool or heat the energy storage system, so that the energy storage system is also ensured to be at a proper temperature. The heat exchange liquid temperature T1 can be detected by providing a temperature sensor at the heat exchange liquid outlet of the thermostat, that is, the heat exchange liquid temperature T1 is the heat exchange liquid temperature at the outlet.
S13: and calculating the temperature deviation. And calculating the temperature deviation E at intervals of preset time DT at least according to the required temperature Ts and the heat exchange liquid temperature T1.
Specifically, when the thermostat is in the refrigeration mode, the temperature deviation e=the heat exchange liquid temperature T1—the energy storage module demand temperature Ts;
when the thermostat is in a heating mode, the temperature deviation e=the energy storage module demand temperature ts—the heat exchange fluid temperature T1. The working mode of the constant temperature device is controlled by the BMS, namely, the BMS sends corresponding control signals to the constant temperature device according to the refrigeration/heating requirement of the energy storage system, so that the constant temperature device works in the refrigeration mode/heating mode.
In one embodiment, the temperature deviation E is calculated by taking into account the errors caused by the different types of battery characteristics, the optimal operating temperature and the sensor mounting position; therefore, when calculating the temperature deviation, correction can be performed based on experimental data. In this embodiment, the method further includes the steps of: acquiring a preset correction parameter Tdif;
when the constant temperature device is in a refrigeration mode, the temperature deviation e=the temperature T1 of the heat exchange liquid- (the energy storage module required temperature ts+the correction parameter Tdif);
when the thermostat is in a heating mode, the temperature deviation e= (energy storage module demand temperature ts+correction parameter Tdif) -heat exchange fluid temperature T1.
The correction parameter Tdif is related to the same type of battery characteristics, the optimal operating temperature or the sensor mounting position, and can be specifically set according to test data.
S14: and calculating the current heat exchange requirement. Based at least on the temperature deviation E and the historical heat exchange demand P of the energy storage system T-1 Calculating the current heat exchange demand P T ；
In one embodiment, the current heat exchange demand P is calculated T The calculation is performed according to the following formula:
P T ＝P T-1 +(K p *E T -K i *E T-1 )；
wherein K is p 、K i And T is a positive integer, which is a preset proportional integral parameter. Wherein K is p 、K i Can be dimensionless number, and carries out unit conversion on temperature deviation and current heat exchange requirement through proportional integral parameter setting, specifically, K p 、K i Can be obtained from test data. In one embodiment, P T-1 P is the last heat exchange requirement T The heat exchange requirement is the current heat exchange requirement.
S15: the output capability is controlled. According to the current heat exchange demand P T The output capacity of the thermostat is controlled.
According to the application, the current heat exchange requirement is calculated according to the previous heat exchange requirement by using the PI algorithm, so that the refrigerating capacity or the heating capacity can be output as required, the capacity waste is prevented, the refrigerating or heating control is more accurate, and the energy storage system has more proper temperature conditions.
In one embodiment, P T-1 、P T Can be expressed by refrigerating/heating power, K p 、K i Proportional integral is carried out on the temperature deviation E, so that the temperature deviation after proportional integral is equal to P T-1 、P T The dimension corresponds to the figure.
In one embodiment, P T-1 、P T The heat exchange requirement can be a percentage of the maximum output capacity of the constant temperature device; the constant temperature device controls the self output capacity according to the percentage; k (K) p 、K i And proportional integration is carried out on the temperature deviation E, so that the temperature deviation after proportional integration is a percentage value. In this embodiment, one thermostat B corresponds to one energy storage system a, so that the maximum output capacity of the thermostat is at least the required capacity of the energy storage system a, and optionally, the maximum output capacity and the required capacity are equal, i.e., P T The expressed heat exchange demand is also a percentage of its rated demand capacity.
It should be noted that when the energy storage system does not emit a cooling or heating demand, the current heat exchange demand may be set to 0.
Further, in one embodiment, the thermal management control method further comprises the steps of:
obtaining the minimum output capacity Nmin of the constant temperature device;
judging the current heat exchange requirement P within a preset time T Whether less than or equal to the minimum output capability Nmin; if yes, the current heat exchange requirement P is met T The minimum output capacity Nmin is set.
In this embodiment, the current heat exchange requirement P is determined within a preset time T Whether the output capacity is smaller than or equal to the minimum output capacity Nmin, if so, the current heat exchange requirement P is met T The minimum output capacity Nmin is set so as to prevent the constant temperature device from being frequently started and stopped. At a preset time of 5 minutes, P T For the percentage example, assume nmin=30%, i.e. the minimum output capacity of the thermostat is 30% of its maximum output capacity, and below 30% the thermostat is shut down. In this embodiment, if the temperature of the heat exchange liquid of the current thermostat changes within 5 minutes, the current heat exchange requirement P is caused T Less than or equal to the minimum output capacity Nmin (30%), the thermostat is controlled to output (30% maximum output capacity), i.e. the current heat exchange demand P will be T Set to 30%. And if the current heat exchange requirement P T For less than 30% and more than 5 minutes, the energy storage system is controlled to stop in order to ensure the refrigeration/heating requirement of the energy storage system.
The environmental temperature also has some effect on the constant temperature control of the energy storage system. For example, when the energy storage system is refrigerated, if the ambient temperature is low, the refrigeration capacity can be relatively small; and if the ambient temperature is high, the refrigerating capacity needs to be large. Based on this, further, in one embodiment, the above thermal management control method further includes the steps of:
current heat exchange demand P according to ambient temperature TA T Temperature compensation is performed in which
P T ＝(P T-1 +Kp*E N -Ki*E N-1 )*B；
Wherein B is a temperature compensation coefficient. When in refrigeration, the higher the ambient temperature is, the larger the B value is; the lower the ambient temperature, the smaller the B value. When heating is performed, the higher the ambient temperature is, the smaller the B value is; the lower the ambient temperature, the greater the B value. Specifically, the magnitude of the B value can be determined by experimentation.
Based on the above-mentioned thermal management control method, the embodiment of the application also provides a thermostat, which is used for controlling the temperature of the energy storage system, as shown in fig. 2, the thermostat B comprises a compressor B2 and a control module B1, and the output end of the control module B1 is electrically connected with the compressor B2 and is used for controlling the compressor B2; the control module B1 includes a temperature acquisition unit B12, a temperature acquisition unit B11, and a processor B13, and of course, a compressor driving unit, a rectifying unit, a filtering unit, etc., and the circuit principle of the thermostat may refer to a compressor control circuit, and only the key circuit unit for realizing the thermal management of the energy storage system is described herein, and other circuit parts will not be described in detail. The temperature acquisition unit B12 and the temperature acquisition unit B11 are respectively and electrically connected with the processor B13; wherein:
the temperature acquisition unit B12 is used for acquiring the required temperature Ts of the energy storage system;
the temperature acquisition unit B11 is used for acquiring the temperature T1 of the heat exchange liquid of the constant temperature device;
a processor: the temperature deviation E is calculated at intervals of preset time DT at least according to the required temperature Ts and the heat exchange liquid temperature T1; based at least on the temperature deviation E, the historical heat exchange demand P of the energy storage system T-1 Calculating the current heat exchange demand P T The method comprises the steps of carrying out a first treatment on the surface of the And controlling the output capacity of the constant temperature device according to the current heat exchange requirement. That is, the processor B13 performs some or all of the method steps in the thermal management control method described above.
Further, in one embodiment, the thermostat B is a screw machine or a centrifuge; current heat exchange demand P T Or historical heat exchange demand P T-1 Is a percentage value; according to the current heat exchange requirement P T Controlling the output capability of the thermostat device includes: according to the current heat exchange requirement P T Calculating the operating frequency F of the screw machine or centrifuge, wherein:
F＝((Fmax-Fmin)/(100-Nmin))*P T +(100*Fmin-Nmin*Fmax)/(100-Nmin)；
the compressor rotating speed when the screw machine or the centrifugal machine outputs the maximum output capacity is Fmax, and the compressor frequency when the screw machine or the centrifugal machine outputs the minimum output capacity Nmin is Fmin.
In another embodiment, the thermostat is a modular machine comprising m modular machines; current heat exchange demand P T Is a percentage value; the controlling the output capacity of the thermostat according to the current heat exchange demand includes:
according to the current heat exchange requirement P T Calculating the number X of the work stations of the module machine, wherein X is m and P T Taking an integer of the product; when X is less than 1, X is set to 1, i.eAnd controlling the 1-station module machine to work.
As shown in fig. 3, the embodiment of the application discloses a constant temperature device B, a waterway device C and an energy storage system a. The energy storage system comprises N energy storage modules (A1, A2 and A3 … … AN), and the specific energy storage modules can be energy storage containers; the constant temperature device B provides a heating or cooling function for the energy storage module; waterway module: the assembly of the liquid cooling circulation pipeline connecting the constant temperature device and the energy storage container comprises a water pump and a cooling liquid distribution pipeline of each energy storage module. Based on an energy storage system comprising a plurality of energy storage modules, an embodiment of the present application provides a thermal management control method for controlling a temperature of the energy storage system by a thermostat, where the energy storage system comprises N energy storage modules, as shown in fig. 4, and the thermal management control method includes the following steps:
step S21: the required temperature Ts (n) of the energy storage module is obtained. The energy storage system comprises a BMS, the BMS can acquire battery states in all the energy storage modules, and accordingly required temperature Ts (n) of each energy storage module is calculated, n is a positive integer, ts (1) represents required temperature of a first energy storage module, and Ts (n) represents required temperature of an nth energy storage module.
Step S22: and obtaining the heat exchange liquid temperature T1 of the constant temperature device. The heat exchange liquid temperature T1 can be detected by providing a temperature sensor at the heat exchange liquid outlet of the thermostat, that is, the heat exchange liquid temperature T1 is the heat exchange liquid temperature at the outlet.
Step S23: calculating temperature deviation; calculating the temperature deviation E (n) of the energy storage module at intervals of preset time DT at least according to the required temperature Ts (n) and the heat exchange liquid temperature T1; e (1) represents the temperature deviation of the first energy storage module, and E (n) represents the temperature deviation of the nth energy storage module.
Specifically, when the thermostat is in the refrigeration mode, the temperature deviation E (n) =the heat exchange liquid temperature T1 of the energy storage module and the energy storage module demand temperature Ts (n);
when the thermostat is in a heating mode, the temperature deviation E (n) =the energy storage module demand temperature Ts (n) -the heat exchange liquid temperature T1. The working mode of the constant temperature device is controlled by the BMS, namely, the BMS sends corresponding control signals to the constant temperature device according to the refrigeration/heating requirement of the energy storage system, so that the constant temperature device works in the refrigeration mode/heating mode.
In one embodiment, the temperature deviation E is calculated by taking into account the errors caused by the different types of battery characteristics, the optimal operating temperature and the sensor mounting position; therefore, when calculating the temperature deviation, correction can be performed based on experimental data. In this embodiment, the method further includes the steps of: acquiring a preset correction parameter Tdif;
specifically, when the thermostat is in the refrigeration mode, the temperature deviation E (n) =the heat exchange liquid temperature T1- (the energy storage module required temperature Ts (n) +the correction parameter Tdif);
when the thermostat is in a heating mode, the temperature deviation E (n) = (energy storage module demand temperature Ts (n) +correction parameter Tdif) -heat exchange fluid temperature T1.
Step S24, calculating the current heat exchange requirement; and respectively calculating the current heat exchange requirement of each energy storage module. Specifically, at least according to the temperature deviation E (n) and the historical heat exchange requirement P of the energy storage module at intervals of preset time DTT T-1 (n) calculating the current heat exchange demand P of the energy storage module T (n); the preset time DTT may be equal to or greater than the preset time DT.
Step S25: calculating the total heat exchange requirement; current heat exchange demand P for each of the energy storage modules T (n) adding to obtain the total heat exchange requirement P of the energy storage system;
specifically, in one embodiment, the current heat exchange demand P is calculated T The calculation is performed according to the following formula:
current heat exchange requirement P of each energy storage module T (n) is calculated according to the following formula:
total heat exchange requirements of energy storage systems
Wherein, M= (DTT/DT) is an integer, i, N and N are positive integers. P (P) T And (n) represents the current heat exchange requirement of the nth energy storage module, and the current heat exchange requirement can be an absolute value such as power or a relative value such as percentage. It should be noted that when each energy storage module of the energy storage system does not send out a cooling or heating requirement, its current heat exchange requirement may be set to 0.
Step S26, controlling output capacity; and controlling the output capacity of the constant temperature device according to the total heat exchange requirement in the energy storage system.
According to the application, the current heat exchange requirements of the energy storage modules are calculated according to the previous heat exchange requirements by utilizing a PI algorithm aiming at different energy storage modules, and then the heat exchange requirements of the whole energy storage system are calculated according to the current heat exchange requirements of a plurality of energy storage modules; not only can output refrigerating capacity or heating capacity as required and prevent the waste of capacity, but also can make refrigeration or heating control more accurate and make the energy storage system possess more suitable temperature conditions.
To prevent frequent start-up and shut-down of the thermostat, in one embodiment, the thermal management control method further comprises:
obtaining the minimum output capacity Nmin of the constant temperature device; judging whether the total heat exchange requirement P is smaller than or equal to the minimum output capacity Nmin within a preset time; if yes, the total heat exchange requirement P is set as the minimum output capacity Nmin.
Further, in one embodiment, the method further comprises the steps of:
presetting a priority parameter K (n) for each energy storage module;
at this time, the current heat exchange requirement P of the energy storage module T (n) is calculated according to the following formula:
the priority parameter corresponding to the nth energy storage module is K (n), and the higher the priority is, the larger the K (n) is;
further, the method comprises the steps of: determining a temperature compensation coefficient B (n) according to the ambient temperature of each energy storage module; wherein B (n) is an ambient temperature compensation coefficient. When in refrigeration, the higher the ambient temperature is, the larger the value of B (n) is; the lower the ambient temperature, the smaller the B (n) value. When heating, the higher the ambient temperature is, the smaller the value of B (n) is; the lower the ambient temperature, the greater the B (n) value. Specifically, the magnitude of the value of B (n) can be determined experimentally.
Current heat exchange requirement P for the energy storage module T (n) performing temperature compensation;
at this time, the liquid crystal display device,
based on the constant temperature device, the constant temperature device is used for controlling the temperature of the energy storage system, and the energy storage system comprises N energy storage modules, and is characterized in that the constant temperature device comprises a compressor and a control module, and the control module is used for controlling the compressor; the control module further comprises a temperature acquisition unit, a temperature acquisition unit and a processor; the temperature acquisition unit and the temperature acquisition unit are respectively and electrically connected with the processor; wherein:
the temperature acquisition unit is used for acquiring the required temperature Ts (n) of each energy storage module;
the temperature acquisition unit is used for acquiring the temperature T1 of the heat exchange liquid of the constant temperature device;
the processor: calculating the temperature deviation E (n) of the energy storage module at intervals of preset time DT at least according to the required temperature Ts (n) and the heat exchange liquid temperature T1; at intervals of preset time DTT, at least according to the temperature deviation E (n) and the historical heat exchange requirement P of the energy storage module T-1 (n) calculating the current heat exchange demand P of the energy storage module T (n); current heat exchange demand P for each of the energy storage modules T (n) adding to obtain the total heat exchange requirement P of the energy storage system; and controlling the output capacity of the constant temperature device according to the total heat exchange requirement in the energy storage system.
Further, in one embodiment, the thermostatic device is a screw machine or a centrifuge; the controlling the output capacity of the thermostat device according to the total heat exchange demand includes:
calculating the percentage H of the total heat exchange requirement P and the maximum output capacity of the constant temperature device; specifically, h= { CRP (1) a1+crp (N) an+ … … +an (CRP (N) An) }/ACout;
wherein CRP (n) =p T (n) K (n) B (n), in which case P T (N) is a percentage value, that is, the current heat exchange requirement is characterized in terms of a percentage of the rated demand capacity of the module, A1 represents the rated demand capacity of the first energy storage module, an represents the rated demand capacity of the nth energy storage module, and AN represents the rated demand capacity of the nth energy storage module. The rated demand capacity is in turn determined by factors such as the type of battery, capacity, charge-discharge rate, etc. In this embodiment, since the energy storage system includes a plurality of energy storage modules, the maximum output capacity of the thermostat is at least the sum of the rated demand capacities of the respective energy storage modules. ACout represents the maximum output capacity of the thermostat.
In this embodiment, the working frequency F of the screw machine or centrifuge is calculated according to the percentage H, wherein:
F＝((Fmax-Fmin)/(100-Nmin))*H)+(100*Fmin-Nmin*Fmax)/(100-Nmin))
the compressor rotating speed when the screw machine or the centrifugal machine outputs the maximum output capacity is Fmax, and the compressor frequency when the screw machine or the centrifugal machine outputs the minimum output capacity Nmin is Fmin.
In another embodiment, the thermostat is a modular machine comprising m modular machines; the controlling the output capacity of the thermostat according to the current heat exchange demand includes:
calculating the current heat exchange demand P T A percentage H of the maximum output capacity of the thermostatic device;
and calculating the number X of the workbench of the module machine according to the percentage H, wherein X is an integer which is the product of m and H. When X is smaller than 1, X is set to be 1, namely, 1 module machine is controlled to work.
In the several embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
In addition, each functional unit in each embodiment of the present specification may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The foregoing description of the preferred embodiments is provided for the purpose of illustration only, and is not intended to limit the scope of the disclosure, since any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the disclosure are intended to be included within the scope of the disclosure.
Claims (9)
1. A thermal management control method for controlling the temperature of an energy storage system by a thermostat, comprising the steps of:
acquiring the required temperature Ts of the energy storage system;
acquiring the temperature T1 of heat exchange liquid of the constant temperature device;
calculating a temperature deviation E at intervals of preset time DT at least according to the required temperature Ts and the heat exchange liquid temperature T1;
based at least on the temperature deviation E, the historical heat exchange demand P of the energy storage system T-1 Calculating the current heat exchange demand P T ；
And controlling the output capacity of the constant temperature device according to the current heat exchange requirement.
2. The method according to claim 1, wherein when the thermostat is in a cooling mode, the temperature deviation E = heat exchange fluid temperature T1-energy storage module demand temperature Ts;
when the thermostat is in a heating mode, the temperature deviation e=the energy storage module demand temperature ts—the heat exchange fluid temperature T1.
3. The thermal management control method according to claim 2, further comprising obtaining a preset correction parameter Tdif;
when the constant temperature device is in a refrigeration mode, the temperature deviation e=the temperature T1 of the heat exchange liquid- (the energy storage module required temperature ts+the correction parameter Tdif);
when the thermostat is in a heating mode, the temperature deviation e= (energy storage module demand temperature ts+correction parameter Tdif) -heat exchange fluid temperature T1.
4. A thermal management control method according to claim 2 or 3, wherein the historical heat exchange demand P of the energy storage system is based at least on the temperature deviation E T-1 Calculating the current heat exchange demand P T The calculation is performed according to the following formula:
P T ＝P T-1 +(K p *E T -K i *E T-1 )；
wherein K is p 、K i Is a preset proportional integral parameter.
5. The thermal management control method according to claim 4, further comprising:
obtaining the minimum output capacity Nmin of the constant temperature device;
judging the current heat exchange requirement P within a preset time T Whether less than or equal to the minimum output capability Nmin; if yes, the current heat exchange requirement P is met T The minimum output capacity Nmin is set.
6. The thermal management control method according to claim 4, further comprising the step of:
according to the ambient temperature T A For the current heat exchange requirementP T Temperature compensation is performed in which
P T ＝(P T-1 +K p *E T -K i *E T-1 )*B；
Wherein B is an ambient temperature compensation coefficient.
7. The constant temperature device is used for controlling the temperature of the energy storage system and is characterized by comprising a compressor and a control module, wherein the control module is used for controlling the compressor; the control module further comprises a temperature acquisition unit, a temperature acquisition unit and a processor; the temperature acquisition unit and the temperature acquisition unit are respectively and electrically connected with the processor; wherein:
the temperature acquisition unit is used for acquiring the required temperature Ts of the energy storage system;
the temperature acquisition unit is used for acquiring the temperature T1 of the heat exchange liquid of the constant temperature device;
the processor: the temperature deviation E is calculated at intervals of preset time DT at least according to the required temperature Ts and the heat exchange liquid temperature T1; based at least on the temperature deviation E, the historical heat exchange demand P of the energy storage system T-1 Calculating the current heat exchange demand P T The method comprises the steps of carrying out a first treatment on the surface of the And controlling the output capacity of the constant temperature device according to the current heat exchange requirement.
8. A thermostatic device according to claim 7 comprising a screw machine or a centrifuge; the current heat exchange requirement P T Is a percentage value; according to the current heat exchange requirement P T Controlling the output capability of the thermostat device includes: according to the current heat exchange requirement P T Calculating the operating frequency F of the screw machine or centrifuge, wherein:
F＝((Fmax-Fmin)/(100-Nmin))*P T )+(100*Fmin-Nmin*Fmax)/(100-Nmin)
the compressor rotating speed when the screw machine or the centrifugal machine outputs the maximum output capacity is Fmax, and the compressor frequency when the screw machine or the centrifugal machine outputs the minimum output capacity Nmin is Fmin.
9. The thermostat of claim 7, wherein the thermostat is a modular unit comprising m modular units; the current heat exchange requirement P T Is a percentage value; the controlling the output capacity of the thermostat according to the current heat exchange demand includes:
according to the current heat exchange requirement P T Calculating the number X of the work stations of the module machine, wherein X is m and P T The product is an integer.
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| CN202210332366.3A CN116937017A (en) | 2022-03-31 | 2022-03-31 | Thermal management control method and constant temperature device |
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| CN202210332366.3A CN116937017A (en) | 2022-03-31 | 2022-03-31 | Thermal management control method and constant temperature device |
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