CN118099617A - Energy storage battery cell temperature control method, system and equipment - Google Patents
Energy storage battery cell temperature control method, system and equipment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000004146 energy storage Methods 0.000 title claims abstract description 32
- 238000005057 refrigeration Methods 0.000 claims abstract description 234
- 238000011217 control strategy Methods 0.000 claims abstract description 52
- 210000004027 cell Anatomy 0.000 claims description 153
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 87
- 238000001816 cooling Methods 0.000 claims description 51
- 230000008859 change Effects 0.000 claims description 41
- 239000012530 fluid Substances 0.000 claims description 28
- 230000035772 mutation Effects 0.000 claims description 19
- 210000000352 storage cell Anatomy 0.000 claims description 13
- 238000005265 energy consumption Methods 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 12
- 239000007788 liquid Substances 0.000 description 11
- 230000000875 corresponding effect Effects 0.000 description 8
- 230000020169 heat generation Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000013527 convolutional neural network Methods 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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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
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
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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
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- Automation & Control Theory (AREA)
- Secondary Cells (AREA)
Abstract
The disclosure relates to a method, a system and equipment for controlling the temperature of an energy storage battery cell, wherein the method comprises the following steps: s01, presetting a first boundary value val 1 and a second boundary value val 2 about the battery cell SOC, and constructing a first interval I 1＝(0％,val1), a second interval I 2＝[val1,val2) and a third interval I 3＝[val2, 100%); s02, acquiring the real-time SOC of the battery core, namely, SOC rt, if the real-time SOC of the battery core belongs to a first interval I 1 or a third interval I 3, executing a first control strategy on the refrigeration equipment, and if the real-time SOC of the battery core belongs to a second interval I 2, executing a second control strategy on the refrigeration equipment, wherein the refrigeration power of the second control strategy is lower than that of the first control strategy. The system and apparatus are for performing the above method. The method and the device can realize effective thermal management of the battery cell, effectively reduce the energy consumption of the refrigeration equipment and improve the energy conversion efficiency of the energy storage system.
Description
Technical Field
The disclosure relates to the technical field of energy storage battery core temperature control, and in particular relates to an energy storage battery core temperature control method, system and equipment.
Background
In the energy storage power station, heat is released when the battery core is charged and discharged, so that the surface temperature of the battery core is increased, the battery core needs to be cooled, and the cooling target temperature is usually 20-35 ℃. In the prior art, the battery cell is cooled by liquid cooling equipment or air cooling equipment, and compared with the air cooling equipment, the liquid cooling equipment has the advantages of high heat dissipation efficiency and small temperature difference, and is beneficial to prolonging the cycle life of the battery cell, so that the utilization rate of the battery cell is gradually improved.
However, the liquid cooling device has the defect of high energy consumption, which increases the overall auxiliary power consumption of the energy storage power station system, affects the conversion efficiency of the system, increases the electricity storage and consumption cost of a user, generally adopts a control strategy of constant power or preset target temperature for the control strategy of the liquid cooling device in the prior art, the constant power instructs the liquid cooling device unit to operate under constant power, the preset target temperature refers to the preset target temperature in the liquid cooling device, and the refrigeration power of the liquid cooling device is controlled based on the temperature difference between the surface temperature and the preset target temperature by acquiring the surface temperature of the electric core, so that the surface temperature of the electric core is maintained at the preset target temperature.
And according to a constant power control strategy, the refrigeration power of the liquid cooling equipment is constantly operated and cannot be adjusted along with the surface temperature of the battery cell, so that the phenomenon that the energy consumption is too high due to the overlarge refrigeration power or the effective cooling cannot be performed due to the insufficient refrigeration power is easy to occur. The control strategy of the preset target temperature is an ideal method, the heat generation power of the battery cell is influenced by multiple factors such as the battery cell current and the SOC state in the practical application process, and the surface temperature change condition of the battery cell is complicated due to the fact that the battery cell is not in a simple linear relation, so that the liquid cooling equipment can not effectively adjust the refrigeration power along with the temperature change of the surface of the battery cell, and the power switching of the liquid cooling equipment is frequent, and the service life of the liquid cooling equipment is influenced.
In summary, in the prior art, when the cooling device is used to cool the battery cell, a more energy-saving and more effective control strategy is lacking, and improvement is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the disclosure aims to provide a method, a system and equipment for controlling the temperature of an energy storage battery cell. The system and the method reasonably control the refrigeration power of the refrigeration equipment by combining the SOC and the surface temperature of the battery cell, can realize effective heat management of the battery cell, can effectively reduce the energy consumption of the refrigeration equipment, and improve the energy conversion efficiency of the energy storage system.
The temperature control method of the energy storage battery cell comprises the following steps:
s01, presetting a first boundary value val 1 and a second boundary value val 2 about the battery cell SOC, wherein the first boundary value val 1 is close to 0%, the second boundary value val 2 is close to 100%, and constructing a first interval I 1＝(0％,val1), a second interval I 2＝[val1,val2) and a third interval I 3＝[val2, 100%);
S02, acquiring a real-time SOC of the battery cell, recording the real-time SOC as an SOC rt, judging a section to which the real-time SOC of the battery cell belongs, executing a first control strategy on the refrigeration equipment if the real-time SOC of the battery cell belongs to a first section I 1 or a third section I 3, and executing a second control strategy on the refrigeration equipment if the real-time SOC of the battery cell belongs to a second section I 2, wherein the refrigeration power of the second control strategy is lower than that of the first control strategy.
Preferably, the first control strategy includes:
presetting a first starting temperature T fir1 and a first critical temperature T cri1;
Acquiring the real-time surface temperature of the battery cell, recording as T rt, and if the T rt≤Tfir1 is met, enabling the refrigeration equipment to be in a stop state; if T fir1＜Trt＜Tcri1 is met, the refrigeration equipment is enabled to refrigerate at the first refrigeration power P 1, and if T cri1≤Trt is met, the refrigeration equipment is enabled to refrigerate at the second refrigeration power P 2;
the second control strategy includes:
Presetting a second starting temperature T fir2 and a second critical temperature T cri2;
Acquiring the real-time surface temperature of the battery cell, recording as T rt, and if the T rt≤Tfir2 is met, enabling the refrigeration equipment to be in a stop state; if T fir2＜Trt＜Tcri2 is met, the refrigeration equipment is enabled to refrigerate at third refrigeration power P 3, and if T cri2≤Trt is met, the refrigeration equipment is enabled to refrigerate at fourth refrigeration power P 4;
Wherein, P 1＜P2,P3＜P4,P1＞P3,P2＞P4.
Preferably, the refrigerating device outputs the maximum flow Q of the refrigerating fluid, and the minimum temperature is T min;
When the water chiller refrigerates with the first refrigeration power P 1, the flow of the output refrigeration fluid is The fluid temperature is T min+Ta;
When the water chiller refrigerates with the second refrigeration power P 2, the flow of the output refrigeration fluid is Q, and the fluid temperature is T min;
when the water chiller refrigerates with the third refrigeration power P 3, the flow of the output refrigeration fluid is The fluid temperature is T min+Tb;
When the water chiller refrigerates with the fourth refrigeration power P 4, the flow of the output refrigeration fluid is The fluid temperature is T min+Tc;
Wherein, T a、Tb、Tc is greater than 0, T a＝Tb,Tb＞Tc.
Preferably, the refrigerating equipment is a water chiller, and comprises a compressor, a water pump and a condensing fan, wherein the maximum frequency of the compressor is F, the full-speed voltage is V, the full rotation speed of the water pump is n, and the full rotation speed of the condensing fan is m;
When the water chiller refrigerates with the first refrigeration power P 1, the compressor is stopped, and the water pump rotates at the speed The operation is carried out, and the condensing fan is stopped;
When the water chiller is cooled by the second cooling power P 2, the compressor is operated at the maximum frequency F and the full-speed voltage V, the water pump is operated at the rotating speed n, and the condensing fan is operated at the rotating speed m;
when the water chiller is cooled by the third cooling power P 3, the compressor is stopped, and the water pump is rotated at the rotating speed The operation is carried out, and the condensing fan is stopped;
when the water chiller is cooled by the fourth cooling power P 4, the compressor uses the frequency And voltage/>Running, the water pump rotates at a speedRunning the condensing fan at the rotating speed/>And (5) running.
Preferably, step S02 further comprises:
According to the real-time surface temperature T rt, the real-time SOC and the section of the battery core, the refrigeration power adopted by the refrigeration equipment at present is recorded as P now, the surface temperature change of the battery core is predicted, the refrigeration power adopted by the battery core for next switching is recorded as P next, the switching time is recorded as T next, whether the refrigeration equipment needs to be pre-switched or not is judged according to the currently adopted refrigeration power P now and the predicted change degree of the refrigeration power P next adopted by the battery core for next switching, if yes, the refrigeration power of the refrigeration equipment is adjusted to the pre-switching power P adv before the predicted switching time T next, the pre-switching power P adv is close to the predicted refrigeration power P next adopted by the battery core for next switching, and if not, the current refrigeration power P now is maintained.
Preferably, the refrigeration power adopted by the next switching of the prediction battery cell is denoted as P next, and the switching time is denoted as t next specifically:
According to the real-time SOC of the battery core and the interval to which the battery core belongs, the time when the SOC of the battery core is predicted to change to another interval is marked as t soc, and the refrigeration power correspondingly adopted is marked as P soc; according to the predicted surface temperature change of the battery cell, the time when the temperature change reaches another temperature range is recorded as t T, and the refrigeration power correspondingly adopted is recorded as P T;
if t soc＜tT, let P next＝Psoc,tnext＝tsoc;
If t soc＞tT, let P next＝PT,tnext＝tT;
If t soc＝tT, selecting the refrigeration power corresponding to the predicted SOC interval and the battery cell surface temperature as P next, and letting t next＝tsoc＝tT.
Preferably, according to the currently adopted refrigeration power P now and the predicted variation degree of the refrigeration power P next adopted by the next switching of the battery cell, judging whether the refrigeration equipment needs to be pre-switched or not specifically comprises:
the abrupt change coefficient MC of the refrigeration equipment from the currently employed refrigeration power P now to the next employed refrigeration power P next is calculated as follows:
MC＝W1*(Fnext-Fnow)+w2*(nnext-nnow)+W3*(mnext-mnow);
Wherein, F next、nnext、mnext respectively represents the predicted compressor frequency, water pump rotation speed and condensing fan rotation speed corresponding to the refrigeration power Pn ext adopted by the battery cell for next switching, F now、nnow、mnow respectively represents the compressor frequency, water pump rotation speed and condensing fan rotation speed corresponding to the refrigeration power P now adopted by the refrigeration equipment currently, and w 1、w2、w3 respectively represents the weights corresponding to the compressor frequency difference, water pump rotation speed difference and condensing fan rotation speed difference;
And, if the compressor is switched from the stopped state to the started state or from the started state to the stopped state, the value of (F next-Fnow) is made equal to 1;
If the water pump is switched from the shutdown state to the startup state or from the startup state to the shutdown state, the value of (n next-nnow) is made equal to 1;
If the condensing fan is switched from the stop state to the start state or from the start state to the stop state, the value of (m next-mnow) is equal to 1;
The mutation threshold MC thr related to the mutation coefficient MC is preset, the obtained mutation coefficient MC is compared with the mutation threshold MC thr in numerical value, if MC is larger than or equal to MC thr, the refrigeration equipment is judged to be required to be pre-switched, and if MC is smaller than MC thr, the refrigeration equipment is judged not to be required to be pre-switched.
An energy storage cell temperature control system of the present disclosure includes:
A preset module for presetting a first boundary value val 1 and a second boundary value val 2 for the battery cell SOC, the first boundary value val 1 being close to 0%, the second boundary value val 2 being close to 100%, constructing a first interval I 1＝(0％,val1), a second interval I 2＝[val1,val2) and a third interval I 3＝[val2, 100%);
the acquisition module is used for acquiring the real-time SOC of the battery cell and recording the real-time SOC as SOC rt;
The processing module is used for judging the section of the real-time SOC of the battery core, if the real-time SOC of the battery core is in the first section I 1 or the third section I 3, executing a first control strategy on the refrigeration equipment, and if the real-time SOC of the battery core is in the second section I 2, executing a second control strategy on the refrigeration equipment, wherein the refrigeration power of the second control strategy is lower than that of the first control strategy.
A computer device of the present disclosure includes a processor and a memory in signal connection, where the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program performs the energy storage cell temperature control method as described above when loaded by the processor.
A computer readable storage medium of the present disclosure has stored thereon at least one instruction or at least one program which, when loaded by a processor, performs the energy storage cell temperature control method as described above.
The energy storage battery cell temperature control method, system and equipment disclosed by the disclosure have the advantages that:
1. According to the method, through analysis of the relation between the SOC of the battery cell and the heat generating efficiency, the heat generating power of the battery cell is maximum in the initial section and the final section of charge and discharge of the battery cell, the heat generating power of the battery cell is relatively smaller in the middle section, and the surface temperature change rate of the battery cell is basically positively correlated with the heat generating power of the battery cell, so that the refrigerating power of the refrigerating equipment is directly controlled according to the SOC state and the surface temperature of the battery cell, the refrigerating power of the refrigerating equipment can meet the cooling requirement on the surface temperature of the battery cell, and can well follow the heat generating power of the battery cell, and further the temperature control method disclosed by the invention can realize effective thermal management on the battery cell, effectively reduce the energy consumption of the refrigerating equipment and improve the energy conversion efficiency of an energy storage system;
2. According to the method, the cold water machine is used as refrigeration equipment, the frequency of a compressor, the rotating speed of a water pump and the rotating speed of a condensing fan of the cold water machine are controlled according to the SOC state and the surface temperature of an electric core, and then the temperature and the flow of cold water output by the cold water machine are controlled, so that the cold water output by the cold water machine can meet the cooling requirement of the electric core, meanwhile, each component of the cold water machine can be controlled in a targeted manner, the power matching of each component is reasonable, the refrigeration energy consumption of the cold water machine is reduced as much as possible, and the energy conversion efficiency of an energy storage system is improved;
3. According to the method, the future SOC and the surface temperature of the battery cell are predicted according to the real-time SOC and the section of the battery cell, the refrigeration power adopted by the next switch of the battery cell is further predicted, whether the refrigeration equipment needs to be pre-switched or not is judged according to the current refrigeration power adopted and the predicted change degree of the refrigeration power adopted by the next switch, the refrigeration power adopted by the battery cell is predicted in advance according to the future SOC change and the surface temperature change of the battery cell, the refrigeration equipment is pre-switched and controlled when the predicted refrigeration power and the current refrigeration power are different, and the power of the refrigeration equipment is adjusted to be close to the refrigeration power adopted by the next time in advance, so that the refrigeration power of the refrigeration equipment is prevented from being greatly adjusted in a short time on the premise that the refrigeration equipment can effectively cool the battery cell, the refrigeration work of the refrigeration equipment is enabled to be more stable, and the service life of the refrigeration equipment is prolonged;
4. According to the method, the mutation coefficient MC is calculated according to the frequency or the rotating speed of each component of the water chiller, the change degree of switching control of the refrigeration equipment is reflected through quantifiable parameters, the change degree of the refrigeration equipment during power switching can be accurately estimated, so that contrast operation is conveniently carried out, accurate and reasonable pre-switching control can be carried out on the refrigeration equipment, the refrigeration power of the refrigeration equipment is prevented from being greatly adjusted in a short time, unnecessary pre-switching control can be avoided, the refrigeration equipment can be guaranteed to effectively cool an electric core, and the energy consumption of the refrigeration equipment can be reduced.
Drawings
Fig. 1 is a flowchart illustrating a method for controlling the temperature of an energy storage battery cell according to the present embodiment;
FIG. 2 is a flowchart illustrating the first control strategy according to the present embodiment;
FIG. 3 is a flowchart illustrating a second control strategy according to the present embodiment;
FIG. 4 is a graph showing the variation of the heat generation efficiency of the battery cell with the SOC of the battery cell according to the embodiment;
Fig. 5 is a schematic structural diagram of the computer device according to the present embodiment.
Reference numerals illustrate: 101-processor, 102-memory.
Detailed Description
As shown in fig. 4, in the charge and discharge process (SOC is charged from 0% to 100% when the battery cell is charged, and SOC is discharged from 100% to 0%) when the battery cell is discharged, the heat generating efficiency of the battery cell is approximately u-shaped along with the change curve of the SOC of the battery cell, that is, the heat generating power of the battery cell is larger in the initial section and the final end section of the charge and discharge, and the heat generating power of the middle section is smaller, correspondingly, the temperature rise of the battery cell is larger in the initial section and the final end section, the surface temperature is obviously raised, and the temperature rise of the middle section is smaller, and the rise of the surface temperature is more gentle.
As shown in fig. 1-3, the method for controlling the temperature of the energy storage battery cell according to the embodiment includes the following steps:
SO1, a first boundary value val 1 and a second boundary value val 2 about the cell SOC are preset, the first boundary value val 1 is close to 0%, the second boundary value val 2 is close to 100%, and a first interval I 1＝(0％,val1), a second interval I 2＝[val1,val2) and a third interval I 3＝[val2, 100% are constructed; in a specific embodiment, the first boundary value val 1 and the second boundary value val 2 may be designed according to parameters of the battery cell, working conditions, refrigeration requirements, and the like, and in an exemplary embodiment, val 1＝10％,val2 =90%, or val 1＝5％,val2 =95%.
S02, acquiring the real-time SOC of the battery cell is recorded as SOC rt, and in a specific embodiment, the SOC state of the battery cell is generally acquired by detecting the average voltage of the battery cell, and the method is exemplified as follows:
And when the average voltage of the battery cell is more than or equal to 3.42V and less than 3.6V in the discharging process of the battery cell with certain specification, judging that the SOC of the battery cell is in [90%, 100%). When the average voltage of the battery cell is smaller than 3.42V and larger than or equal to 2.73V, the SOC of the battery cell is judged to be [10%, 90%). When the average voltage of the battery cell is more than 2.6 and less than 2.73V, the SOC of the battery cell is judged to be (0 percent, 10 percent). And when the average voltage of the battery cell is less than 2.6V, judging that the battery cell stops discharging.
In the process, the SOC state of the battery cell can be obtained through the average voltage of the battery cell. The charging process is opposite to the discharging process described above, and can be understood with reference to the above description, and will not be repeated here.
Judging the section of the real-time SOC of the battery core, if the real-time SOC of the battery core belongs to the first section I 1 or the third section I 3, executing a first control strategy on the refrigeration equipment, and if the real-time SOC of the battery core belongs to the second section I 2, executing a second control strategy on the refrigeration equipment, wherein the refrigeration power of the second control strategy is lower than that of the first control strategy.
Specifically, as shown in fig. 2, when the real-time SOC of the battery cell belongs to the first interval I 1 = (0%, 10%) or the third interval I 3 = [90%, 100%), a first control strategy is adopted, where the first control strategy includes:
presetting a first starting temperature T fir1 and a first critical temperature Tc ri1;
For example, the optimum operating temperature of the battery cell is 20 ℃ to 35 ℃, and the first start-up temperature T fir1 =20 ℃ and the first critical temperature T cri1 =32 ℃.
Acquiring the real-time surface temperature of the battery cell to be recorded as T rt by arranging a temperature sensor on the surface of the battery cell;
If T rt＜Tfir1 is met, the surface temperature of the battery cell is lower than the optimal operation temperature interval, refrigeration and cooling of the battery cell are not needed, and the refrigeration equipment is in a shutdown state;
If T fir1≤Trt＜Tcri1 is met, the fact that the surface temperature of the battery cell is higher at the moment is indicated, cooling is needed, the refrigeration equipment is enabled to refrigerate with smaller first refrigeration power P 1, the cooling requirement can be met, and meanwhile energy consumption is smaller;
If T cri1≤Trt is satisfied, it indicates that the surface temperature of the battery cell has exceeded the preset critical temperature and is too high, the refrigeration device is made to cool with the second refrigeration power P 2 (usually full power), so that the battery cell is cooled down rapidly by the refrigeration device.
As shown in fig. 3, when the real-time SOC of the battery cell belongs to the second interval I 2 = [10%, 90%), a second control strategy is adopted, where the second control strategy includes:
Presetting a second starting temperature T fir2 and a second critical temperature T cri2; the second start-up temperature T fir2 =20 ℃ and the second critical temperature T cri2 =32 ℃.
The real-time surface temperature of the obtained battery cell is recorded as T rt,
If T rt＜Tfir2 is met, the surface temperature of the battery cell is lower than the optimal operation temperature interval, refrigeration and cooling of the battery cell are not needed, and the refrigeration equipment is in a shutdown state;
If T fir2≤Trt＜Tcri2 is met, the refrigeration equipment is refrigerated by the third refrigeration power P 3;
If T cri2≤Trt is met, the refrigeration equipment is refrigerated by the fourth refrigeration power P 4;
Wherein, P 1＜P2,P3＜P4,P1＞P3,P2＞P4.
More specifically, according to the characteristic that the heat generation power of the battery core is approximately distributed in a U shape along with the SOC of the battery core, the overall refrigeration power under the first control strategy is larger than that of the second control strategy, so that the refrigeration equipment can provide larger refrigeration capacity for the battery core when the SOC of the battery core is positioned at the initial section and the final section, the characteristics of large heat generation efficiency and obvious temperature rise of the battery core in the initial section and the final section are attached to each other, the cooling requirement of the battery core is met, and when the SOC of the battery core is positioned at the middle section, the refrigeration equipment is enabled to adopt the refrigeration power smaller than that of the first control strategy due to the fact that the heat generation power of the battery core is smaller and relatively stable, and the refrigeration equipment is particularly enabled to be enabled to perform refrigeration in P 1＞P3,P2＞P4, so that the overall energy consumption in the cooling process of the battery core is reduced.
In a specific embodiment, the refrigeration device is a chiller, which exchanges heat with the battery cell by outputting a refrigeration fluid, i.e. cold water, so as to reduce the temperature of the battery cell.
The refrigerating equipment outputs the maximum flow Q of the refrigerating fluid, and the minimum temperature is T min;
When the water chiller refrigerates with the first refrigeration power P 1, the flow of the output refrigeration fluid is The fluid temperature is T min+Ta;
When the water chiller refrigerates with the second refrigeration power P 2, the flow of the output refrigeration fluid is Q, and the fluid temperature is T min;
when the water chiller refrigerates with the third refrigeration power P 3, the flow of the output refrigeration fluid is The fluid temperature is T min+Tb;
When the water chiller refrigerates with the fourth refrigeration power P 4, the flow of the output refrigeration fluid is The fluid temperature is T min+Tc;
Wherein T a、Tb、Tc is greater than 0, T a＝Tb,Tb＞Tc, and exemplary, T a＝Tb＝6℃,Tc =3℃.
The water chiller comprises a compressor, a water pump and a condensing fan, wherein the maximum frequency of the compressor is F, the full-speed voltage is V, the full rotation speed of the water pump is n, and the full rotation speed of the condensing fan is m;
When the water chiller refrigerates with the first refrigeration power P 1, the compressor is stopped, and the water pump rotates at the speed The operation is carried out, and the condensing fan is stopped;
When the water chiller is cooled by the second cooling power P 2, the compressor is operated at the maximum frequency F and the full-speed voltage V, the water pump is operated at the rotating speed n, and the condensing fan is operated at the rotating speed m (the water chiller is operated at full power);
when the water chiller is cooled by the third cooling power P 3, the compressor is stopped, and the water pump is rotated at the rotating speed The operation is carried out, and the condensing fan is stopped;
when the water chiller is cooled by the fourth cooling power P 4, the compressor uses the frequency And voltage/>Running, the water pump rotates at a speedRunning the condensing fan at the rotating speed/>Operation (chiller half power operation).
More specifically, since the SOC and the surface temperature of the battery cell change at all times during the charging and discharging process, that is, the refrigeration power of the chiller, the frequency of the compressor, the rotational speed of the water pump, and the rotational speed of the condensing fan need to be adjusted according to the SOC and the surface temperature of the battery cell, so as to conform to the control strategy described above, the working states of the refrigeration components may be adjusted instantaneously, for example, when the SOC of the battery cell is 89% and the surface temperature of the battery cell is detected as 31 ℃ during the charging process, the second control strategy is adopted for the refrigeration device at this time, so that the chiller is cooled with the third refrigeration power P3, the compressor is stopped, and the water pump is rotated at the rotational speedAnd (5) running, and stopping the condensing fan. At the next moment, the SOC of the battery cell is increased to 90%, and the surface temperature of the battery cell is increased to 32.5 ℃, so that the SOC of the battery cell is at the last tail section, a first control strategy is adopted, the surface temperature is higher than a first critical temperature, so that the water chiller is in a full-power running state, namely, the compressor is required to be instantaneously switched from a shutdown state to a maximum frequency running state, and the rotating speed of the water pump is increased from/>The temperature of the cooling fan is increased to the full rotation speed n, the condensing fan is switched to the full rotation speed m from the shutdown state, and in the same way, the phenomenon of sudden stop of the cooling fan is likely to exist, and the sudden start and the sudden stop mode easily lose the compressor, the water pump and the condensing fan, so that the service life of the refrigerating assembly is influenced.
Based on this, step S02 of the present embodiment further includes:
According to the real-time surface temperature T rt, the real-time SOC and the section of the battery core, the current refrigeration power adopted by the refrigeration equipment is recorded as P now, specifically, according to the surface temperature and the SOC judgment method, the current control strategy adopted by the refrigeration equipment is obtained, and the current refrigeration power of the water chiller is recorded as P now. On the other hand, the battery management system can acquire charge and discharge data of the battery core, and the SOC of the battery core at a certain moment in the future can be predicted according to the current SOC of the battery core, and in an exemplary process of charging a certain battery core, the SOC increased every 1min is 1%, if the current SOC is 1%, the SOC after 5min of prediction is 6%, and the like, the SOC of the battery core can be predicted.
Specifically, as shown in fig. 4, the relation graph of the battery cell heat-generating power and the battery cell SOC is shown, that is, for a certain battery cell, the battery cell heat-generating power at the future time can be predicted according to the predicted battery cell SOC, assuming that the current time is T0, the battery cell surface temperature is T0, the SOC predicted at a future time T1 is recorded as SOC1, and the battery cell heat-generating power at each time in the time period from T0 to T1 can be obtained from the relation of the battery cell heat-generating power and the battery cell SOC, so that the battery cell surface temperature at the future time T1 can be predicted based on the battery cell surface temperature T0 at the current time. In other alternative embodiments, the surface temperature of the battery cell can be predicted by using the convolutional neural network model, which is characterized in that the surface temperature data of the battery cell is used as output, the SOC of the battery cell is used as input to train, iterate and optimize the blank convolutional neural network model so as to obtain the convolutional neural network capable of predicting the surface temperature of the battery cell based on the SOC of the battery cell, and the surface temperature of the battery cell at the future time can be predicted by inputting the SOC at the current time and the surface temperature of the battery cell.
And then, predicting the refrigeration power adopted by the next switching of the battery core as P next and the moment of switching as t next, judging whether the refrigeration equipment needs to be pre-switched according to the currently adopted refrigeration power P now and the predicted variation degree of the refrigeration power P next adopted by the next switching of the battery core, if so, adjusting the refrigeration power of the refrigeration equipment to the pre-switching power P adv before the moment t next of predicting the switching, wherein the pre-switching power P adv is close to the predicted refrigeration power P next adopted by the next switching of the battery core, and if not, maintaining the current refrigeration power P now.
Specifically, in the control strategy of the present embodiment, only when at least one of the SOC and the surface temperature of the battery cell changes across regions, the cooling power of the cooling device needs to be switched, so that it is required to predict whether the next time the cooling power needs to be switched is caused by the temperature change or the SOC change, or by both the temperature change and the SOC change. The specific method comprises the following steps:
According to the real-time SOC of the battery core and the interval to which the battery core belongs, the time when the SOC of the battery core is predicted to change to another interval is recorded as t soc, if the battery core is currently positioned in a second interval I 2 = [10%, 90%) in the charging process, the time when the SOC of the battery core reaches 90% is predicted according to the method, and under the condition that the temperature does not cross the interval, the refrigeration power correspondingly adopted in the SOC state is recorded as P soc;
Similarly, according to the predicted surface temperature change of the battery cell, the time when the temperature is changed to another temperature range is recorded as t T, and under the condition that the SOC does not change across intervals, the refrigeration power correspondingly adopted is recorded as P T;
if t soc＜tT indicates that the SOC changes the cooling power of the cooling device before the temperature, P next＝Psoc,tnext＝tsoc is set;
If t soc＞tT indicates that the temperature is changed before the SOC changes the cooling power of the cooling device, P next＝PT,tnext＝tT is set;
If t soc＝tT indicates that the temperature and the SOC change the cooling power of the cooling device at the same time, the predicted SOC interval and the cooling power corresponding to the cell surface temperature are selected as P next, and t next＝tsoc＝tT.
By this step, the target cooling power P next to be switched can be predicted the next time the cooling apparatus is subjected to power switching.
On the premise of realizing the prediction of the refrigeration power P next of the next switching of the refrigeration equipment, the change degree of the switching can be estimated, specifically:
the abrupt change coefficient MC of the refrigeration equipment from the currently employed refrigeration power P now to the next employed refrigeration power P next is calculated as follows:
MC＝w1*(Fnext-Fnow)+w2*(nnext-nnow)+w3*(mnext-mnow);
Wherein, F next、nnext、mnext respectively represents the predicted compressor frequency, water pump rotation speed and condensing fan rotation speed corresponding to the refrigeration power P next adopted by the battery cell for next switching, F now、nnow、mnow respectively represents the compressor frequency, water pump rotation speed and condensing fan rotation speed corresponding to the refrigeration power P now adopted by the refrigeration equipment currently, and w 1、w2、w3 respectively represents the weights corresponding to the compressor frequency difference, water pump rotation speed difference and condensing fan rotation speed difference;
And, if the compressor is switched from the stopped state to the started state or from the started state to the stopped state, the value of (F next-Fnow) is made equal to 1;
If the water pump is switched from the shutdown state to the startup state or from the startup state to the shutdown state, the value of (n next-nnow) is made equal to 1;
If the condensing fan is switched from the stop state to the start state or from the start state to the stop state, the value of (m next-mnow) is equal to 1;
The mutation threshold MC thr related to the mutation coefficient is preset, the obtained mutation coefficient MC is compared with the mutation threshold MC thr in numerical value, if MC is larger than or equal to MC thr, the refrigeration equipment is judged to be required to be pre-switched, and if MC is smaller than MC thr, the refrigeration equipment is judged not to be required to be pre-switched.
Through the step, whether the refrigeration equipment needs to be pre-switched or not can be judged, when the mutation coefficient MC is larger than the preset mutation threshold MC thr, if the mutation coefficient MC can be set to be 0.5, the change degree of the refrigeration equipment in the next power switching is judged to be larger, the refrigeration equipment can be possibly damaged, the refrigeration equipment can be pre-switched and controlled in advance for a plurality of moments, such as 1min, the refrigeration power of the refrigeration equipment is adjusted to the pre-switched power,
For example, in the charging process, the SOC of the battery cell is 80% at the current time, the surface temperature of the battery cell is detected to be 25 ℃, and at this time, a second control strategy is adopted for the refrigerating device to cool the water chiller at the third cooling power P 3, the compressor is stopped, and the water pump is rotated at the rotation speedAnd (5) running, and stopping the condensing fan.
Predicting that at a certain time tx in the future, the SOC of the battery cell reaches 90%, meanwhile, the surface temperature of the battery cell reaches 32 ℃, calculating that the mutation coefficient of the current change is larger than a mutation threshold value according to the above formula, and switching the starting of the compressor from a stop state to the frequency 1min before the time tx by adopting pre-switching controlAnd voltage/>Running, the rotating speed of the water pump is controlled by/>To/>The condensing fan is started from a stop state and takes the rotating speed/>The operation is carried out, and the refrigerating equipment is switched to a full-power state after 1min, so that the pre-switching control can be carried out on the refrigerating equipment, and the damage to the refrigerating equipment caused by instantaneous large-amplitude power switching of the refrigerating equipment is reduced or avoided.
The embodiment also provides an energy storage cell temperature control system, which comprises:
A preset module for presetting a first boundary value val 1 and a second boundary value val 2 for the battery cell SOC, the first boundary value val 1 being close to 0%, the second boundary value val 2 being close to 100%, constructing a first interval I 1＝(0％,val1), a second interval I 2＝[val1,val2) and a third interval I 3＝[val2, 100%);
the acquisition module is used for acquiring the real-time SOC of the battery cell and recording the real-time SOC as SOC rt;
The processing module is used for judging the section of the real-time SOC of the battery core, if the real-time SOC of the battery core is in the first section I 1 or the third section I 3, executing a first control strategy on the refrigeration equipment, and if the real-time SOC of the battery core is in the second section I 2, executing a second control strategy on the refrigeration equipment, wherein the refrigeration power of the second control strategy is lower than that of the first control strategy.
The energy storage cell temperature control system of the present embodiment and the foregoing energy storage cell temperature control method belong to the same inventive concept, and can be understood with reference to the above description, and are not described herein again.
As shown in fig. 5, this embodiment further provides a computer device, which includes a processor 101 and a memory 102 connected by a bus signal, where at least one instruction or at least one program is stored in the memory 102, and the at least one instruction or the at least one program performs the energy storage cell temperature control method as described above when loaded by the processor 101. The memory 102 may be used to store software programs and modules, and the processor 101 executes various functional applications by running the software programs and modules stored in the memory 102. The memory 102 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, application programs required for functions, and the like; the storage data area may store data created according to the use of the device, etc. In addition, memory 102 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 102 may also include a memory controller to provide access to the memory 102 by the processor 101.
The method embodiments provided by the embodiments of the present disclosure may be performed in a computer terminal, a server, or a similar computing device, i.e., the above-described computer apparatus may include a computer terminal, a server, or a similar computing device. The internal structure of the computer device may include, but is not limited to: processor, network interface and memory. Wherein the processor, network interface, and memory within the computer device may be connected by a bus or other means.
The processor 101 (or CPU) is a computing core and a control core of a computer device. The network interface may optionally include a standard wired interface, a wireless interface (e.g., WI-FI, mobile communication interface, etc.). Memory 102 (Memory) is a Memory device in a computer device for storing programs and data. It is understood that the memory 102 herein may be a high-speed RAM memory device or a non-volatile memory device (non-volatile memory), such as at least one magnetic disk memory device; optionally, at least one memory device located remotely from the aforementioned processor 101. The memory 102 provides storage space that stores an operating system of the electronic device, which may include, but is not limited to: windows (an operating system), linux (an operating system), android (an Android, a mobile operating system) system, IOS (a mobile operating system) system, etc., which are not limiting of the present disclosure; also stored in this memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor 101. In the embodiment of the present disclosure, the processor 101 loads and executes one or more instructions stored in the memory 102 to implement the method for controlling the temperature of the energy storage cell according to the above embodiment of the method.
Embodiments of the present disclosure also provide a computer readable storage medium having stored thereon at least one instruction or at least one program which, when loaded by the processor 101, performs the stored energy cell temperature control method as described above. The computer-readable storage medium carries one or more programs which, when executed, implement methods in accordance with embodiments of the present disclosure.
According to embodiments of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium. Examples may include, but are not limited to: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this disclosure, a computer-readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
According to the method, through analysis of the relation between the SOC of the battery cell and the heat generating efficiency, the heat generating power of the battery cell is maximum in the initial section and the final section of charge and discharge of the battery cell, the heat generating power of the battery cell is relatively smaller in the middle section, and the surface temperature change rate of the battery cell is basically positively correlated with the heat generating power of the battery cell, so that the refrigerating power of the refrigerating equipment is directly controlled according to the SOC state and the surface temperature of the battery cell, the refrigerating power of the refrigerating equipment can meet the cooling requirement on the surface temperature of the battery cell, and can well follow the heat generating power of the battery cell, and further the temperature control method disclosed by the invention can realize effective thermal management on the battery cell, effectively reduce the energy consumption of the refrigerating equipment and improve the energy conversion efficiency of an energy storage system;
According to the method, the cold water machine is used as refrigeration equipment, the frequency of a compressor, the rotating speed of a water pump and the rotating speed of a condensing fan of the cold water machine are controlled according to the SOC state and the surface temperature of an electric core, and then the temperature and the flow of cold water output by the cold water machine are controlled, so that the cold water output by the cold water machine can meet the cooling requirement of the electric core, meanwhile, each component of the cold water machine can be controlled in a targeted manner, the power matching of each component is reasonable, the refrigeration energy consumption of the cold water machine is reduced as much as possible, and the energy conversion efficiency of an energy storage system is improved;
According to the method, the future SOC and the surface temperature of the battery cell are predicted according to the real-time SOC and the section of the battery cell, the refrigeration power adopted by the next switch of the battery cell is further predicted, whether the refrigeration equipment needs to be pre-switched or not is judged according to the current refrigeration power adopted and the predicted change degree of the refrigeration power adopted by the next switch, the refrigeration power adopted by the battery cell is predicted in advance according to the future SOC change and the surface temperature change of the battery cell, the refrigeration equipment is pre-switched and controlled when the predicted refrigeration power and the current refrigeration power are different, and the power of the refrigeration equipment is adjusted to be close to the refrigeration power adopted by the next time in advance, so that the refrigeration power of the refrigeration equipment is prevented from being greatly adjusted in a short time on the premise that the refrigeration equipment can effectively cool the battery cell, the refrigeration work of the refrigeration equipment is enabled to be more stable, and the service life of the refrigeration equipment is prolonged;
according to the method, the mutation coefficient MC is calculated according to the frequency or the rotating speed of each component of the water chiller, the change degree of switching control of the refrigeration equipment is reflected through quantifiable parameters, the change degree of the refrigeration equipment during power switching can be accurately estimated, so that contrast operation is conveniently carried out, accurate and reasonable pre-switching control can be carried out on the refrigeration equipment, the refrigeration power of the refrigeration equipment is prevented from being greatly adjusted in a short time, unnecessary pre-switching control can be avoided, the refrigeration equipment can be guaranteed to effectively cool an electric core, and the energy consumption of the refrigeration equipment can be reduced.
In the description of the present disclosure, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present disclosure and simplify the description, and without being otherwise described, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be configured and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present disclosure.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the claims.
Claims (10)
1. The energy storage cell temperature control method is characterized by comprising the following steps of:
s01, presetting a first boundary value val 1 and a second boundary value val 2 about the battery cell SOC, wherein the first boundary value val 1 is close to 0%, the second boundary value val 2 is close to 100%, and constructing a first interval I 1＝(0％,val1), a second interval I 2＝[val1,val2) and a third interval I 3＝[val2, 100%);
S02, acquiring a real-time SOC of the battery cell, recording the real-time SOC as an SOC rt, judging a section to which the real-time SOC of the battery cell belongs, executing a first control strategy on the refrigeration equipment if the real-time SOC of the battery cell belongs to a first section I 1 or a third section I 3, and executing a second control strategy on the refrigeration equipment if the real-time SOC of the battery cell belongs to a second section I 2, wherein the refrigeration power of the second control strategy is lower than that of the first control strategy.
2. The energy storage cell temperature control method of claim 1, wherein the first control strategy comprises:
presetting a first starting temperature T fir1 and a first critical temperature T cri1;
Acquiring the real-time surface temperature of the battery cell, recording as T rt, and if the T rt≤Tfir1 is met, enabling the refrigeration equipment to be in a stop state; if T fir1＜Trt＜Tcri1 is met, the refrigeration equipment is enabled to refrigerate at the first refrigeration power P 1, and if T cri1≤Trt is met, the refrigeration equipment is enabled to refrigerate at the second refrigeration power P 2;
the second control strategy includes:
Presetting a second starting temperature T fir2 and a second critical temperature T cri2;
Acquiring the real-time surface temperature of the battery cell, recording as T rt, and if the T rt≤Tfir2 is met, enabling the refrigeration equipment to be in a stop state; if T fir2＜Trt＜Tcri2 is met, the refrigeration equipment is enabled to refrigerate at third refrigeration power P 3, and if T cri2≤Trt is met, the refrigeration equipment is enabled to refrigerate at fourth refrigeration power P 4;
Wherein, P 1＜P2,P3＜P4,P1>P3,P2>P4.
3. The method of claim 2, wherein the maximum flow rate of the refrigerating fluid output by the refrigerating device is Q, and the minimum temperature is T min;
When the water chiller refrigerates with the first refrigeration power P 1, the flow of the output refrigeration fluid is The fluid temperature is T min+Ta;
When the water chiller refrigerates with the second refrigeration power P 2, the flow of the output refrigeration fluid is Q, and the fluid temperature is T min;
when the water chiller refrigerates with the third refrigeration power P 3, the flow of the output refrigeration fluid is The fluid temperature is T min+Tb;
When the water chiller refrigerates with the fourth refrigeration power P 4, the flow of the output refrigeration fluid is The fluid temperature is T min+Tc;
Wherein, T a、Tb、Tc is greater than 0, T a＝Tb,Tb>Tc.
4. The method for controlling the temperature of an energy storage battery cell according to claim 3, wherein the refrigeration equipment is a chiller, and comprises a compressor, a water pump and a condensing fan, wherein the maximum frequency of the compressor is F, the full-speed voltage is V, the full rotation speed of the water pump is n, and the full rotation speed of the condensing fan is m;
When the water chiller refrigerates with the first refrigeration power P 1, the compressor is stopped, and the water pump rotates at the speed The operation is carried out, and the condensing fan is stopped;
When the water chiller is cooled by the second cooling power P 2, the compressor is operated at the maximum frequency F and the full-speed voltage V, the water pump is operated at the rotating speed n, and the condensing fan is operated at the rotating speed m;
when the water chiller is cooled by the third cooling power P 3, the compressor is stopped, and the water pump is rotated at the rotating speed The operation is carried out, and the condensing fan is stopped;
when the water chiller is cooled by the fourth cooling power P 4, the compressor uses the frequency And voltage/>Running, water pump at rotation speed/>Running the condensing fan at the rotating speed/>And (5) running.
5. The method of claim 4, wherein step S02 further comprises:
According to the real-time surface temperature T rt, the real-time SOC and the section of the battery core, the refrigeration power adopted by the refrigeration equipment at present is recorded as P now, the surface temperature change of the battery core is predicted, the refrigeration power adopted by the battery core for next switching is recorded as P next, the switching time is recorded as T next, whether the refrigeration equipment needs to be pre-switched or not is judged according to the currently adopted refrigeration power P now and the predicted change degree of the refrigeration power P next adopted by the battery core for next switching, if yes, the refrigeration power of the refrigeration equipment is adjusted to the pre-switching power P adv before the predicted switching time T next, the pre-switching power P adv is close to the predicted refrigeration power P next adopted by the battery core for next switching, and if not, the current refrigeration power P now is maintained.
6. The method of claim 5, wherein the predicted cooling power for the next switching of the battery is denoted as P next and the switching time is denoted as t next specifically:
According to the real-time SOC of the battery core and the interval to which the battery core belongs, the time when the SOC of the battery core is predicted to change to another interval is marked as t soc, and the refrigeration power correspondingly adopted is marked as P soc; according to the predicted surface temperature change of the battery cell, the time when the temperature change reaches another temperature range is recorded as t T, and the refrigeration power correspondingly adopted is recorded as P T;
if t soc＜tT, let P next＝Psoc,tnext＝tsoc;
if t soc>tT, let P next＝PT,tnext＝tT;
If t soc＝tT, selecting the refrigeration power corresponding to the predicted SOC interval and the battery cell surface temperature as P next, and letting t nexf＝tsoc＝tT.
7. The method of claim 6, wherein determining whether pre-switching control of the refrigeration device is required according to the currently adopted refrigeration power P now and the predicted change degree of the refrigeration power P next adopted for next switching of the battery cell is specifically:
the abrupt change coefficient MC of the refrigeration equipment from the currently employed refrigeration power P now to the next employed refrigeration power P next is calculated as follows:
MC＝w1*(Fnext-Fnow)+w2*(nnext-nnow)+w3*(mnext-mnow);
Wherein, F next、nnext、mnext respectively represents the predicted compressor frequency, water pump rotation speed and condensing fan rotation speed corresponding to the refrigeration power P next adopted by the battery cell for next switching, F now、nnow、mnow respectively represents the compressor frequency, water pump rotation speed and condensing fan rotation speed corresponding to the refrigeration power P now adopted by the refrigeration equipment currently, and w 1、w2、w3 respectively represents the weights corresponding to the compressor frequency difference, water pump rotation speed difference and condensing fan rotation speed difference;
And, if the compressor is switched from the stopped state to the started state or from the started state to the stopped state, the value of (F next-Fnow) is made equal to 1;
If the water pump is switched from the shutdown state to the startup state or from the startup state to the shutdown state, the value of (n next-nnow) is made equal to 1;
If the condensing fan is switched from the stop state to the start state or from the start state to the stop state, the value of (m next-mnow) is equal to 1;
The mutation threshold MC thr related to the mutation coefficient MC is preset, the obtained mutation coefficient MC is compared with the mutation threshold MC thr in numerical value, if MC is larger than or equal to MC thr, the refrigeration equipment is judged to be required to be pre-switched, and if MC is smaller than MC thr, the refrigeration equipment is judged not to be required to be pre-switched.
8. An energy storage cell temperature control system, comprising:
A preset module for presetting a first boundary value val 1 and a second boundary value val 2 regarding the battery cell SOC, the first boundary value val 1 being close to 0%, the second boundary value vatl 2 being close to 100%, constructing a first interval I 1＝(0％,vatl1), a second interval I 2＝[val1,val2) and a third interval I 3＝[val2, 100%);
the acquisition module is used for acquiring the real-time SOC of the battery cell and recording the real-time SOC as SOC rt;
The processing module is used for judging the section of the real-time SOC of the battery core, if the real-time SOC of the battery core belongs to the first section I 1 or the third section I 3, executing a first control strategy on the refrigeration equipment, and if the real-time S0C of the battery core belongs to the second section I 2, executing a second control strategy on the refrigeration equipment, wherein the refrigeration power of the second control strategy is lower than that of the first control strategy.
9. A computer device comprising a processor and a memory in signal connection, characterized in that the memory has stored therein at least one instruction or at least one program, which when loaded by the processor performs the energy storage cell temperature control method according to any of claims 1-7.
10. A computer readable storage medium having stored thereon at least one instruction or at least one program, wherein the at least one instruction or the at least one program when loaded by a processor performs the method of controlling the temperature of an energy storage cell according to any of claims 1-7.
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