CN112599885A - Control method of liquid cooling system and liquid cooling system - Google Patents
Control method of liquid cooling system and liquid cooling system Download PDFInfo
- Publication number
- CN112599885A CN112599885A CN202011439326.6A CN202011439326A CN112599885A CN 112599885 A CN112599885 A CN 112599885A CN 202011439326 A CN202011439326 A CN 202011439326A CN 112599885 A CN112599885 A CN 112599885A
- Authority
- CN
- China
- Prior art keywords
- temperature
- battery module
- battery
- rise rate
- battery modules
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a control method of a liquid cooling system and the liquid cooling system, which belong to the technical field of energy storage system heat dissipation, wherein the control method of the liquid cooling system comprises the steps of judging whether a battery module generates temperature jump when the energy storage system enters an operation stage, if so, determining a first battery module generating the temperature jump and a first electric valve corresponding to the first battery module, and then regulating the temperature rise rate of the first battery module to be equal to the average temperature rise rate of a plurality of battery modules by controlling the opening degree of the first electric valve; if not, controlling the opening degree of the electric valve according to a preset control strategy so that the temperature difference between two adjacent battery modules is smaller than a first preset value. The control method of the liquid cooling system and the liquid cooling system provided by the invention realize the control of the battery module with temperature jump, prolong the service life of the battery module and the energy storage system and reduce the probability of potential safety hazard.
Description
Technical Field
The invention relates to the technical field of energy storage system heat dissipation, in particular to a control method of a liquid cooling system and the liquid cooling system.
Background
The energy storage system is used for storing electric energy, the energy storage system usually comprises a plurality of energy storage battery cabinets, each energy storage battery cabinet comprises a plurality of battery modules, the battery modules can generate a large amount of heat in the operation stage, the battery modules are in a charging state or a discharging state in the operation stage, and the battery modules are cooled by the liquid cooling system in order to prevent the battery modules from being too high in temperature.
The temperature of the battery module is lower before entering the operation stage, after entering the operation stage, the temperature of the battery module gradually rises, and due to reasons such as aging of the battery module or poor heat dissipation performance, the battery module can generate the temperature jump, that is, the increase rate of the temperature of the battery module is suddenly increased, so that the temperature of the battery module is greatly different from the temperature of the adjacent battery module, and great potential safety hazard exists. However, how to control the liquid cooling system to cope when the battery module has a temperature jump is not described in the prior art.
Disclosure of Invention
The invention aims to provide a control method of a liquid cooling system and the liquid cooling system, which realize the control of a battery module with temperature jump, prolong the service life of the battery module and an energy storage system and reduce the probability of potential safety hazard.
As the conception, the technical scheme adopted by the invention is as follows:
a control method of a liquid cooling system, wherein the liquid cooling system comprises a plurality of battery modules and a plurality of electric valves which are connected with the battery modules in a one-to-one correspondence mode, and the method comprises the following steps:
s1, when the energy storage system enters the operation stage, judging whether the temperature jump of the battery module occurs, if so, executing a step S2; if not, go to step S4;
s2, determining a first battery module with temperature jump and a first electric valve corresponding to the first battery module;
s3, adjusting the temperature rise rate of the first battery module to be equal to the average temperature rise rate of the plurality of battery modules by controlling the opening of the first electric valve;
and S4, controlling the opening degrees of the electric valves according to a preset control strategy, so that the temperature difference between two adjacent battery modules is smaller than a first preset value.
Optionally, in step S1, if the temperature of a battery module is less than the average temperature of a plurality of battery modules, it is determined that no temperature jump occurs in the battery module; and if the temperature of the battery module is greater than or equal to the average temperature of the plurality of battery modules, determining that the battery module has temperature jump.
Optionally, in step S4, the preset control strategy includes obtaining a temperature rise rate of each battery module, and controlling an opening degree of the electrically operated valve, so that a difference between the temperature rise rate of each battery module and a standard temperature rise rate is smaller than a second preset value.
Optionally, before step S4, the method further comprises:
acquiring historical temperature data of a plurality of battery modules;
calculating historical average temperatures of the plurality of battery modules according to the historical temperature data;
calculating historical average temperature rise rates of the plurality of battery modules according to the historical average temperature;
determining the historical average temperature rise rate as the standard temperature rise rate.
Optionally, when the energy storage system does not enter the operation stage, the method further includes:
s100, acquiring a first temperature of each battery module;
s101, according to a first standard temperature and the first temperature of each battery module, controlling the opening degree of the electric valve corresponding to each battery module so that the temperature difference between every two adjacent battery modules is smaller than a third preset value.
Optionally, the first standard temperature is a minimum of a plurality of the first temperatures.
Optionally, in step S3, when the temperature rise rate of the first battery module is smaller than the standard temperature rise rate, the opening degree of the first electrically operated valve corresponding to the first battery module is decreased; and when the temperature rise rate of the first battery module is greater than the standard temperature rise rate, the opening degree of the first electric valve corresponding to the first battery module is increased.
Optionally, when the energy storage system enters a preset stage, the method further includes:
s5, acquiring a second temperature of each battery module;
and S6, controlling the opening degree of the electric valve corresponding to each battery module according to a second standard temperature and the second temperature of each battery module, so that the difference value between the second temperature of each battery module and the second standard temperature is smaller than a fourth preset value, and the second standard temperature is the average temperature of the plurality of battery modules.
Optionally, when the temperature increment of a preset battery module at each moment is less than or equal to 0 within a preset time period, it is determined that the energy storage system enters a preset stage, and the preset battery module is the battery module with the highest temperature in the plurality of battery modules.
A liquid cooling system, comprising:
a heat-exchanging device is arranged on the heat-exchanging device,
one end of each first cooling branch pipe is connected to an outlet of the heat exchange device, the plurality of first cooling branch pipes correspond to the plurality of battery modules in the energy storage system one by one, and the other end of each first cooling branch pipe is connected with a cooling liquid inlet of the corresponding battery module;
one end of each second cooling branch pipe is connected to an inlet of the heat exchange device, the second cooling branch pipes correspond to the battery modules one by one, and the other end of each second cooling branch pipe is connected with a cooling liquid outlet of the corresponding battery module;
the electric valves correspond to the first cooling branch pipes one by one, and are installed on the corresponding first cooling branch pipes;
the control assembly is connected with the electric valve and used for judging whether the battery module has temperature jump when the energy storage system enters an operation stage; determining a first battery module with temperature jump and a first electric valve corresponding to the first battery module; adjusting the temperature rise rate of the first battery module to be equal to the average temperature rise rate of the plurality of battery modules by controlling the opening of the first electric valve; and controlling the opening degrees of the electric valves according to a preset control strategy so that the temperature difference between two adjacent battery modules is smaller than a first preset value.
The invention has at least the following beneficial effects:
in the control method of the liquid cooling system provided in this embodiment, after the energy storage system enters the operation stage, when the control component determines that the first battery module having the temperature jump exists, the first electrically operated valve corresponding to the first battery module is determined first, then the opening degree of the first electric valve is controlled to adjust the temperature rise rate of the first battery module to be equal to the average temperature rise rate of the plurality of battery modules, thereby controlling the temperature increase rate of the first battery module and preventing the temperature of the first battery module from increasing too fast, so that even if the temperature of the first battery module jumps, the temperature difference between the battery module and the adjacent battery module is still small, the control of the battery module with temperature jump is realized, the difference of cycle life, capacity and internal resistance among the battery modules is reduced or even eliminated, the service lives of the battery modules and an energy storage system are prolonged, and the probability of potential safety hazards is reduced.
In the liquid cooling system that this embodiment provided, a plurality of motorised valves and a plurality of first cooling branch pipe one-to-one, and a plurality of first cooling branch pipes and a plurality of battery module one-to-one to can realize controlling the volume of the coolant liquid that provides in the battery module that corresponds to this motorised valve through the aperture of control motorised valve, and then realize the independent control to every battery module temperature, it is unanimous through the temperature control with a plurality of battery modules, in order to improve the equilibrium degree of a plurality of battery module temperatures.
Drawings
Fig. 1 is a first schematic diagram of a liquid cooling system according to an embodiment of the present invention;
fig. 2 is a second schematic diagram of a liquid cooling system according to an embodiment of the invention;
fig. 3 is a flowchart of a method for controlling a liquid cooling system according to an embodiment of the present invention;
fig. 4 is a graph of temperature versus time for an energy storage system according to an embodiment of the present invention.
In the figure:
1. a heat exchange device; 2. a first cooling branch pipe; 3. a second cooling branch pipe; 4. an electrically operated valve; 5. a first cooling manifold; 6. a second cooling manifold; 7. a liquid feeding main pipe; 8. a liquid return main pipe; 10. a battery module; 100. energy storage battery rack.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The liquid cooling system comprises a heat exchanger and a cooling pipeline, the cooling pipeline comprises a cooling main pipe and a plurality of cooling branch pipes which are respectively connected to the cooling main pipe, the plurality of cooling branch pipes are in one-to-one correspondence with the plurality of energy storage battery cabinets, and each cooling branch pipe is used for cooling the corresponding energy storage battery cabinet to prevent the temperature of the battery module in the energy storage battery cabinet from being too high. After the cooling liquid in the cooling branch pipe flows through one energy storage battery cabinet, the temperature drop of a plurality of battery modules in the energy storage battery cabinet is the same, but due to the difference of the aging degree and the performance of the battery modules, the temperature rise rate of two adjacent battery modules possibly has a larger difference, and after the cooling branch pipe is cooled, the temperature difference between the two adjacent battery modules is still larger, namely, the plurality of battery modules in the energy storage battery cabinet have the condition of unbalanced temperature, so that the chemical reaction rate and the self-discharge reaction rate of the plurality of battery modules are different, the cycle life, the capacity and the internal resistance among the battery modules are larger, the service lives of the battery modules and the energy storage battery cabinet are influenced, and potential safety hazards also exist. Therefore, a liquid cooling system capable of reducing the temperature difference between the battery modules is needed.
In order to facilitate understanding of the control method of the liquid cooling system provided in this embodiment, the embodiment first describes specific structures of the energy storage system and the liquid cooling system.
As shown in fig. 1 and 2, the energy storage system may include a plurality of battery modules 10, and the liquid cooling system includes a heat exchanging device 1, a control assembly, a plurality of first cooling branches 2, a plurality of second cooling branches 3, and a plurality of electric valves 4. One end of each of the first cooling branch pipes 2 is connected to an outlet of the heat exchange device 1, the first cooling branch pipes 2 correspond to the battery modules 10 one by one, and the other end of each of the first cooling branch pipes 2 is connected to a cooling liquid inlet of the corresponding battery module 10 so as to provide cooling liquid to a water cooling plate in the battery module 10 through the cooling liquid inlet.
One end of each of the second cooling branch pipes 3 is connected to the inlet of the heat exchanging device 1, the second cooling branch pipes 3 correspond to the battery modules 10 one by one, and the other end of each of the second cooling branch pipes 3 is connected to the coolant outlet of the corresponding battery module 10, so that the coolant in the water cooling plate flows to the second cooling branch pipes 3 from the coolant outlet.
As shown in fig. 1, the plurality of electric valves 4 correspond to the plurality of first cooling branch pipes 2 one-to-one, and each electric valve 4 is installed on the corresponding first cooling branch pipe 2, and when the electric valves 4 have different opening degrees, the flow rates of the cooling liquid in the corresponding first cooling branch pipes 2 are different, so that the amount of the cooling liquid entering the battery modules 10 can be adjusted, and the temperature drop of each battery module 10 can be the same or different.
The control assembly is connected to each electric valve 4, and the control assembly controls the liquid cooling system according to the control method of the liquid cooling system provided in this embodiment. Specifically, the control assembly includes a processor and a memory, and the processor runs a program corresponding to an executable program code by reading the executable program code stored in the memory, so as to implement the control method of the liquid cooling system provided in the embodiment.
Further, as shown in fig. 1 or fig. 2, the energy storage system further includes a plurality of energy storage battery cabinets 100, and each energy storage battery cabinet 100 includes a plurality of battery modules 10. The liquid cooling system further includes a plurality of first cooling manifolds 5, a plurality of second cooling manifolds 6, a plurality of first cooling tube groups, and a plurality of second cooling tube groups.
Wherein, a plurality of first cooling manifolds 5 are all connected to the outlet of the heat exchange device 1. The plurality of first cooling tube groups are in one-to-one correspondence with the plurality of first cooling manifolds 5, each first cooling tube group comprises a plurality of first cooling branch tubes 2, and the first cooling branch tubes 2 in the first cooling tube group are connected to the corresponding first cooling manifolds 5, that is, the first cooling tube groups can be communicated with the outlets of the heat exchange device 1 through the first cooling manifolds 5. The plurality of first cooling manifolds 5 correspond to the plurality of energy storage battery cabinets 100 one by one, and the plurality of first cooling branch pipes 2 in each first cooling pipe group are respectively connected to the plurality of battery modules 10 in the corresponding energy storage battery cabinet 100 one by one.
The plurality of second cooling manifolds 6 are all connected to the inlet of the heat exchange device 1, the plurality of second cooling tube groups are in one-to-one correspondence with the plurality of second cooling manifolds 6, each second cooling tube group comprises a plurality of second cooling branch tubes 3, and the second cooling branch tubes 3 in the second cooling tube groups are connected to the corresponding second cooling manifolds 6, that is, the second cooling branch tubes 3 are communicated with the inlet of the heat exchange device 1 through the second cooling manifolds 6. The plurality of second cooling manifolds 6 correspond to the plurality of energy storage battery cabinets 100 one by one, and the plurality of second cooling branch pipes 3 in each second cooling pipe group are respectively connected to the plurality of battery modules 10 in the corresponding energy storage battery cabinet 100 one by one.
Still further, as shown in fig. 2, the liquid cooling system further includes a liquid feeding main pipe 7 and a liquid returning main pipe 8. Wherein, send liquid trunk 7 to connect in heat transfer device 1's export, and a plurality of first cooling house steward 5 connect respectively in sending liquid trunk 7 for a plurality of first cooling house steward 5 are through sending liquid trunk 7 and heat transfer device 1's export intercommunication. The liquid return main pipe 8 is connected to the inlet of the heat exchange device 1, and the plurality of second cooling main pipes 6 are respectively connected to the liquid return main pipe 8, so that the plurality of second cooling main pipes 6 are communicated with the inlet of the heat exchange device 1 through the liquid return main pipe 8.
A method of controlling the liquid cooling system provided in the present embodiment will be described below.
As shown in fig. 3, the method for controlling the liquid cooling system includes the following steps:
s1, when the energy storage system enters the operation stage, judging whether the temperature jump of the battery module 10 occurs, if so, executing a step S2; if not, step S4 is executed.
The energy storage system entering the operation stage means that the energy storage system is started and starts a charging operation or a discharging operation. The control module can acquire the temperature of each battery module 10 through the temperature detector provided on the battery module 10 and determine whether a temperature jump occurs in the battery module 10 according to the acquired temperature. The temperature jump refers to a situation that the temperature of the battery module 10 rises rapidly due to the aging of the battery module 10 or poor heat dissipation, and the like, and the rising rate of the temperature of the battery module 10 is higher than a preset value. Alternatively, the frequency of acquiring the temperature of the battery module 10 by the control component may be 1, 3, 5 times per second, so as to improve the accuracy of the acquired temperature. If there is a temperature jump of the battery modules 10, step S2 is executed, and if there is no temperature jump of all the battery modules 10, step S4 is executed.
S2, determining the first battery module with the temperature jump and the first electric valve corresponding to the first battery module.
Each temperature detector corresponds to one battery module 10, and after the control component determines that the battery module 10 has a temperature jump according to the temperature detected by the temperature controller, the battery module 10 having the temperature jump can be determined according to the corresponding relationship between the temperature detector and the battery module 10, which is stored in advance. After the first battery module is determined, the control component determines the electrically operated valve 4 connected to the first battery module according to the corresponding relationship between the battery module 10 and the electrically operated valve 4, and for convenience of distinguishing, the electrically operated valve 4 is defined as a first electrically operated valve in this embodiment. By determining the first electrically operated valve, the control component can determine a control objective. After the first battery module and the first electrically operated valve are determined, the process continues to step S3.
And S3, adjusting the temperature rise rate of the first battery module to be equal to the average temperature rise rate of the plurality of battery modules 10 by controlling the opening degree of the first electric valve.
In step S3, the control module may first calculate the temperature rise rate of the first battery module at the current time, then determine the average temperature rise rate of the plurality of battery modules 10 at the current time according to the temperature rise rate of the plurality of battery modules 10 at the current time, then determine the adjustment amount of the first electric valve according to a first difference between the temperature rise rate of the first battery module and the average temperature rise rate of the plurality of battery modules 10, and finally adjust the opening of the first electric valve by the adjustment amount, so that the temperature rise rate of the first battery module is equal to the average temperature rise rate of the plurality of battery modules 10. The temperature increase rate at the current time may be a difference between the temperature at the current time and the temperature at the previous time. The adjustment amount of the first electric valve may be obtained from the first difference according to a preset algorithm, or the adjustment amount of the first electric valve may be determined according to a corresponding relationship between the first difference and the adjustment amount of the first electric valve, which is not limited in this embodiment. Optionally, the adjustment amount of the first electric valve is positively correlated with the first difference. After step S3 is completed, execution of step S4 is prohibited.
In this embodiment, the average temperature rise rate of the plurality of battery modules 10 may be an average temperature rise rate of all the battery modules 10 in the energy storage system, or, when the energy storage system includes a plurality of energy storage battery cabinets 100, the average temperature rise rate of the plurality of battery modules 10 may be an average temperature rise rate of a plurality of battery modules 10 in the energy storage battery cabinet 100 where the first battery module is located.
Optionally, in step S3, when the temperature rise rate of the first battery module is smaller than the standard temperature rise rate, the opening of the first electrically operated valve corresponding to the first battery module is decreased to decrease the amount of the coolant flowing into the first battery module, so as to increase the temperature rise rate of the first battery module to the labeled temperature rise rate; when the temperature rise rate of first battery module is greater than standard temperature rise rate, the aperture of the first motorised valve that the first battery module corresponds is increased to the volume of the coolant liquid that the increase flowed into in the first battery module, and then reduces the temperature rise rate of first battery module fast.
It should be noted that, when a plurality of battery modules 10 with temperature jumps appear at the same time, the control component may determine and control the first electrically operated valves corresponding to the battery modules 10 with temperature jumps one by one until the temperature rise rates of all the first battery modules with temperature jumps are adjusted to be equal to the labeled temperature rise rate.
And S4, controlling the opening degrees of the electric valves 4 according to a preset control strategy, so that the temperature difference between two adjacent battery modules 10 is smaller than a first preset value.
When the energy storage system enters the operation stage, but there is no battery module 10 with temperature jump, the control assembly can control the opening degree of the electric valve 4 according to a preset control strategy, and only the temperature difference between two adjacent battery modules 10 is required to be smaller than a first preset value, so as to realize the purpose of temperature equalization of the energy storage system in the operation stage.
In the control method of the liquid cooling system provided in this embodiment, after the energy storage system enters the operation stage, when the control component determines that the first battery module having the temperature jump exists, the first electrically operated valve corresponding to the first battery module is determined first, then, the opening degree of the first electrically operated valve is controlled to adjust the temperature increase rate of the first battery module to be equal to the average temperature increase rate of the plurality of battery modules 10, thereby controlling the temperature increase rate of the first battery module and preventing the temperature of the first battery module from increasing too fast, so that even if the temperature of the first battery module jumps, the temperature difference between the battery module 10 and the adjacent battery module is still small, the control of the battery module 10 with temperature jump is realized, the difference of the cycle life, the capacity and the internal resistance among the battery modules 10 is reduced or even eliminated, the service lives of the battery modules 10 and an energy storage system are prolonged, and the probability of potential safety hazards is reduced.
Alternatively, when it is determined in step S1 whether or not the temperature jump of the battery module 10 has occurred, the determination may be made as follows: if the acquired temperature of the battery module 10 at the current moment is less than the average temperature of the plurality of battery modules 10 at the current moment, determining that the temperature jump of the battery module 10 does not occur; if the acquired temperature of the battery module 10 at the current time is greater than or equal to the average temperature of the plurality of battery modules 10 at the current time, it is determined that the temperature jump of the battery module 10 occurs. When the temperature of the battery module 10 is equal to the average temperature of the plurality of battery modules 10, the average temperature is referred to as a temperature jump critical point.
For example, as shown in fig. 4, the temperature jump critical point is an intersection point of a solid line and a dashed line, wherein the solid line in fig. 4 represents an average temperature of the plurality of battery modules 10, the dashed line represents a real-time temperature of the example battery module, and fig. 4 is a graph of a temperature of the energy storage system after the liquid cooling system is controlled by using a control method in the prior art and a time relationship, it can be seen that the temperature of the example battery module sharply rises after reaching the temperature jump critical point, which results in a large temperature difference between the example battery module and the adjacent battery module. When the battery module in this example is the battery module with the highest temperature among the plurality of battery modules 10, the temperature jump critical point indicates that the temperature of the battery module 10 with the highest temperature is equal to the average temperature of the plurality of battery modules 10, which is an ideal state that the temperature of the energy storage system reaches, and is a state that the energy storage system can reach or approach after being controlled by the control method of the liquid cooling system provided in this embodiment. Therefore, in the present embodiment, the control unit adjusts the opening degree of the electrically operated valve 4 corresponding to the battery module 10 with the highest temperature under the condition of the temperature jump critical point to increase the amount of the cooling liquid supplied to the battery module, thereby rapidly reducing the temperature of the battery module 10 with the highest temperature. As can be seen in fig. 4, from time t2, the energy storage system enters the operational phase until time t3 ends. The abscissa in fig. 4 is time and the ordinate is temperature in degrees celsius.
In this embodiment, when the temperature jump does not occur in the battery module 10, in step S4, the preset control strategy includes that the control component first obtains the temperature rise rate of each battery module 10, and then controls the opening of the electric valve 4 corresponding to each battery module, so that the difference between the temperature rise rate of each battery module 10 and the standard temperature rise rate is smaller than a second preset value. The standard temperature rise rate and the second preset value are stored in the control assembly in advance, the control assembly compares the temperature rise rate with the standard temperature rise rate after acquiring the temperature rise rate of the battery module 10, when the difference value between the two is greater than or equal to the second preset value, the opening degree of the electric valve 4 corresponding to the battery module 10 needs to be adjusted according to the difference value between the two until the difference value between the temperature rise rate of the battery module 10 and the standard temperature rise rate is smaller than the second preset value, and then the temperature equalization in the operation stage is realized; and when the difference value between the temperature rise rate of the battery module 10 and the standard temperature rise rate is smaller than a second preset value, controlling the opening degree of the electric valve 4 corresponding to the battery module 10 to be kept unchanged.
The energy storage system is internally provided with a plurality of battery modules, in the operation stage, the time point of temperature jump of each battery module 10 is different from the critical point of temperature jump, at the moment, the control assembly needs to monitor the temperature change state of each battery module 10 in real time, and as long as the battery module 10 has temperature jump and reaches the critical point of temperature jump, the liquid cooling system is controlled by the control method of the liquid cooling system.
Further, the standard temperature rise rate in this embodiment is obtained by the following method, that is, before step S4, the method for controlling the liquid cooling system further includes the following steps:
s01, historical temperature data of the plurality of battery modules 10 is acquired.
The historical temperature data of the plurality of battery modules 10 is obtained through the control component, and the historical temperature data can be the temperature of the battery modules 10 detected by the temperature detector in the last operation stage of the energy storage system. Preferably, the historical temperature data may be data acquired on the premise that temperature jump does not occur in all battery modules in the energy storage system, so as to have a higher reference value.
For example, the last operation stage is one hour long, the historical temperature data may include the temperature of each battery module 10 at each time within the one hour, and each battery module 10 corresponds to 3600 temperatures when the temperature detector detects the temperature once per second.
S02, the historical average temperature of the plurality of battery modules 10 is calculated based on the historical temperature data.
Specifically, after obtaining the temperature of each battery module 10 at each moment, the control module may calculate the historical average temperature of the plurality of battery modules 10 at any moment, and further obtain the historical average temperature of the plurality of battery modules 10 at each moment.
And S03, calculating the historical average temperature rise rate of the plurality of battery modules 10 according to the historical average temperature.
After the historical average temperature of the plurality of battery modules 10 at each moment is obtained, the control component can calculate the historical average temperature rise rate of the plurality of battery modules 10 at each moment according to the historical average temperature. For example, the historical average temperature rise rate at the current time may be a difference between the temperature at the current time and the temperature at the previous time.
And S04, determining the historical average temperature rising rate as a standard temperature rising rate.
The historical average temperature rise rate obtained according to the historical temperature data is determined as the standard temperature rise rate in the embodiment, so that the difference value between the standard temperature rise rate and the highest temperature rise rate and the lowest temperature rise rate in the plurality of battery modules 10 can be smaller, the rapid adjustment of the temperature rise rates of the battery modules 10 with the highest temperature rise rate and the battery modules 10 with the lowest temperature rise rate can be facilitated, and the temperature rise rate of the battery modules 10 can rapidly reach the standard temperature rise rate.
In this embodiment, the standard temperature rise rates of the energy storage system at each time in the operation stage are the same or different, and the control component may establish a corresponding relationship between the current operation stage and the previous operation stage, for example, the first time of the current operation stage corresponds to the previous first time of the previous operation stage, and the difference between the first time and the start time of the current operation stage is the same as the difference between the previous first time and the start time of the previous operation stage. After the control assembly acquires the temperature rise rate of the first battery module at the first moment and the average temperature rise rate corresponding to the first moment, the opening degree of the first electric valve is adjusted, so that the temperature rise rate of the first battery module at the first moment is equal to the average temperature rise rate corresponding to the first moment. The first time is any time in the operation phase.
Optionally, the energy storage system may further comprise a pre-operational phase, i.e. a phase in which the energy storage system does not enter a pre-operational phase. As shown in fig. 4, the energy storage system enters the pre-operation phase at time t1 and ends the pre-operation phase at time t 2. For example, the pre-operational phase may be 15 minutes before entering the operational phase.
In order to further improve the temperature equalization effect of the battery module 10, in the embodiment, the temperature of the battery module 10 is controlled by the following method when the energy storage system is in the pre-operation stage:
s100, a first temperature of each battery module 10 is acquired.
The first temperature of each battery module 10 is obtained by the control assembly, and the temperature of each battery module 10 is different before the energy storage system enters the operation stage.
S101, controlling an opening degree of the electric valve 4 corresponding to each battery module 10 according to the first standard temperature and the first temperature of each battery module 10, so that a temperature difference between two adjacent battery modules 10 is smaller than a third preset value.
The first standard temperature and the third preset value may be preset and stored in the control assembly, after the control assembly obtains the first temperature of each battery module 10, the plurality of first temperatures are respectively compared with the first standard temperature, when a difference between the first temperature and the first standard temperature is greater than or equal to the third preset value, it indicates that the temperature of the battery module 10 corresponding to the first temperature is too high or too low, and therefore, the opening degree of the electric valve 4 corresponding to the battery module 10 needs to be adjusted, so that the temperature of the battery module 10 approaches the first standard temperature, when the temperatures of the plurality of battery modules 10 are all equal to or approach the first standard temperature, the temperature equalization before the energy storage system enters the operation stage is realized, and a basis is provided for controlling the energy storage system to enter the operation stage. In this embodiment, since the energy storage system directly enters the operation stage from the pre-operation stage, the control component may directly perform step S1 after performing step S101.
Optionally, in this embodiment, the first standard temperature is the minimum value of the plurality of first temperatures, that is, when the energy storage system is located at the pre-operation stage, the temperature of the battery module 10 with the lowest temperature in the battery modules 10 is the first standard temperature. At this time, the control module only needs to determine the continuous opening range of the electric valve 4 according to the difference between the first temperature and the first standard temperature, and does not need to judge whether the first temperature is higher than the first standard temperature or lower than the first standard temperature, so that the calculation amount of the control module can be reduced, and the control speed of the control module can be increased. It is understood that the first standard temperature may also be an average of the temperatures of the plurality of battery modules 10.
The embodiment further provides a control method when the energy storage system enters the preset stage, when it is determined that the energy storage system meets any one of two preset conditions, the energy storage system is determined to enter the preset stage, the two preset conditions are respectively an end operation stage of the energy storage system, and when the temperature increment of the preset battery module at each moment is less than or equal to 0 within a preset time period, the preset battery module is the battery module 10 with the highest temperature in the plurality of battery modules 10. For example, as shown in fig. 4, the starting time of the preset phase is time t3, and the ending time is time t 4.
Further, when the energy storage system enters the preset stage, the method for controlling the liquid cooling system in this embodiment further includes the following steps:
s5, the second temperature of each battery module 10 is acquired.
In this embodiment, since the energy storage system directly enters the preset stage after the operation stage is finished, the control module may directly perform step S5 after performing step S4 or step S3.
S6, controlling the opening degree of the electrically operated valve 4 corresponding to each battery module 10 according to the second standard temperature and the second temperature of each battery module 10, so that the difference between the second temperature of each battery module 10 and the second standard temperature is smaller than a fourth preset value, and the second standard temperature is the average temperature of the plurality of battery modules 10.
Wherein, the second standard temperature and the fourth preset value can be preset and stored in the control component, after the control component obtains the second temperature of each battery module 10, the second temperature is compared with the second standard temperature, when the difference between the second temperature and the second standard temperature is greater than or equal to the fourth preset value, it indicates that the temperature of the battery module 10 corresponding to the second temperature is higher or lower, therefore, the opening degree of the electric valve 4 corresponding to the battery module 10 needs to be adjusted, so as to make the temperature of the battery module 10 approach to the second standard temperature, when the temperatures of a plurality of battery modules 10 are all equal to or approach to the second standard temperature, the temperature equalization of the energy storage system at the preset stage is realized, the difference of cycle life, capacity and internal resistance between the battery modules 10 is further reduced, and the service lives of the battery modules 10 and the energy storage system are further prolonged, the probability of potential safety hazards is further reduced. In step S6, the opening degree of the motor-operated valve 4 corresponding to each battery module 10 is controlled so that the difference between the second temperature of each battery module 10 at the current time and the average temperature of the plurality of battery modules 10 at the current time is smaller than the fourth preset value, based on the average temperature of the plurality of battery modules 10 at the current time and the second temperature of each battery module 10 at the current time.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The control method of the liquid cooling system comprises a plurality of battery modules and a plurality of electric valves which are connected with the battery modules in a one-to-one correspondence mode, and is characterized by comprising the following steps:
s1, when the energy storage system enters the operation stage, judging whether the temperature jump of the battery module occurs, if so, executing a step S2; if not, go to step S4;
s2, determining a first battery module with temperature jump and a first electric valve corresponding to the first battery module;
s3, adjusting the temperature rise rate of the first battery module to be equal to the average temperature rise rate of the plurality of battery modules by controlling the opening of the first electric valve;
and S4, controlling the opening degrees of the electric valves according to a preset control strategy, so that the temperature difference between two adjacent battery modules is smaller than a first preset value.
2. The method of controlling a liquid cooling system according to claim 1, wherein in step S1, if the temperature of a battery module is less than the average temperature of a plurality of battery modules, it is determined that the battery module has not experienced a temperature jump; and if the temperature of the battery module is greater than or equal to the average temperature of the plurality of battery modules, determining that the battery module has temperature jump.
3. The method as claimed in claim 1, wherein in step S4, the preset control strategy includes obtaining a temperature rise rate of each battery module, and controlling an opening degree of the electrically operated valve corresponding to each battery module, so that a difference between the temperature rise rate of each battery module and a standard temperature rise rate is smaller than a second preset value.
4. The method of controlling a liquid cooling system according to claim 3, wherein before step S4, the method further comprises:
acquiring historical temperature data of a plurality of battery modules;
calculating historical average temperatures of the plurality of battery modules according to the historical temperature data;
calculating historical average temperature rise rates of the plurality of battery modules according to the historical average temperature;
determining the historical average temperature rise rate as the standard temperature rise rate.
5. The method of controlling a liquid cooling system of claim 3, wherein when the energy storage system is not entering an operational phase, the method further comprises:
s100, acquiring a first temperature of each battery module;
s101, according to a first standard temperature and the first temperature of each battery module, controlling the opening degree of the electric valve corresponding to each battery module so that the temperature difference between every two adjacent battery modules is smaller than a third preset value.
6. The method of claim 5, wherein the first standard temperature is a minimum of a plurality of the first temperatures.
7. The method of claim 3, wherein in step S3, when the temperature rise rate of the first battery module is less than the standard temperature rise rate, the opening of the first electrically operated valve corresponding to the first battery module is decreased; and when the temperature rise rate of the first battery module is greater than the standard temperature rise rate, the opening degree of the first electric valve corresponding to the first battery module is increased.
8. The method of claim 1, wherein when the energy storage system enters a predetermined phase, the method further comprises:
s5, acquiring a second temperature of each battery module;
and S6, controlling the opening degree of the electric valve corresponding to each battery module according to a second standard temperature and the second temperature of each battery module, so that the difference value between the second temperature of each battery module and the second standard temperature is smaller than a fourth preset value, and the second standard temperature is the average temperature of a plurality of battery modules.
9. The method of claim 8, wherein when the temperature increment of a predetermined battery module at each time is less than or equal to 0 within a predetermined time period, it is determined that the energy storage system enters a predetermined stage, and the predetermined battery module is a battery module with the highest temperature among the plurality of battery modules.
10. A liquid cooling system, comprising:
a heat-exchanging device is arranged on the heat-exchanging device,
one end of each first cooling branch pipe is connected to an outlet of the heat exchange device, the plurality of first cooling branch pipes correspond to the plurality of battery modules in the energy storage system one by one, and the other end of each first cooling branch pipe is connected with a cooling liquid inlet of the corresponding battery module;
one end of each second cooling branch pipe is connected to an inlet of the heat exchange device, the second cooling branch pipes correspond to the battery modules one by one, and the other end of each second cooling branch pipe is connected with a cooling liquid outlet of the corresponding battery module;
the electric valves correspond to the first cooling branch pipes one by one, and are installed on the corresponding first cooling branch pipes;
the control assembly is connected with the electric valve and used for judging whether the battery module has temperature jump when the energy storage system enters an operation stage; determining a first battery module with temperature jump and a first electric valve corresponding to the first battery module; adjusting the temperature rise rate of the first battery module to be equal to the average temperature rise rate of the plurality of battery modules by controlling the opening of the first electric valve; and controlling the opening degrees of the electric valves according to a preset control strategy so that the temperature difference between two adjacent battery modules is smaller than a first preset value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011439326.6A CN112599885A (en) | 2020-12-07 | 2020-12-07 | Control method of liquid cooling system and liquid cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011439326.6A CN112599885A (en) | 2020-12-07 | 2020-12-07 | Control method of liquid cooling system and liquid cooling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112599885A true CN112599885A (en) | 2021-04-02 |
Family
ID=75191761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011439326.6A Pending CN112599885A (en) | 2020-12-07 | 2020-12-07 | Control method of liquid cooling system and liquid cooling system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112599885A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335807A (en) * | 2021-12-30 | 2022-04-12 | 中联重科股份有限公司 | Battery cooling system of electric mining dump truck and control method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785192A (en) * | 2016-11-30 | 2017-05-31 | 浙江吉利控股集团有限公司 | A kind of heat management system |
| CN107403975A (en) * | 2017-07-21 | 2017-11-28 | 精进电动科技股份有限公司 | A kind of battery energy storage liquid cooling system current equalizer and method |
| CN109713382A (en) * | 2018-12-11 | 2019-05-03 | 威马汽车科技集团有限公司 | Batteries of electric automobile plate cooling system and control method |
| CN111231770A (en) * | 2018-11-29 | 2020-06-05 | 比亚迪股份有限公司 | Vehicle thermal management system and vehicle |
| CN111786057A (en) * | 2020-06-16 | 2020-10-16 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Battery temperature balance control method and device for vehicle and storage medium |
| CN111864299A (en) * | 2020-06-23 | 2020-10-30 | 江苏大学 | Balanced heat dissipation liquid cooling system for power battery based on heat-shrinkable material and control method of balanced heat dissipation liquid cooling system |
-
2020
- 2020-12-07 CN CN202011439326.6A patent/CN112599885A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785192A (en) * | 2016-11-30 | 2017-05-31 | 浙江吉利控股集团有限公司 | A kind of heat management system |
| CN107403975A (en) * | 2017-07-21 | 2017-11-28 | 精进电动科技股份有限公司 | A kind of battery energy storage liquid cooling system current equalizer and method |
| CN111231770A (en) * | 2018-11-29 | 2020-06-05 | 比亚迪股份有限公司 | Vehicle thermal management system and vehicle |
| CN109713382A (en) * | 2018-12-11 | 2019-05-03 | 威马汽车科技集团有限公司 | Batteries of electric automobile plate cooling system and control method |
| CN111786057A (en) * | 2020-06-16 | 2020-10-16 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Battery temperature balance control method and device for vehicle and storage medium |
| CN111864299A (en) * | 2020-06-23 | 2020-10-30 | 江苏大学 | Balanced heat dissipation liquid cooling system for power battery based on heat-shrinkable material and control method of balanced heat dissipation liquid cooling system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335807A (en) * | 2021-12-30 | 2022-04-12 | 中联重科股份有限公司 | Battery cooling system of electric mining dump truck and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108376810B (en) | Power battery thermal management method and system | |
| CN108172930B (en) | Battery pack cooling control method and device and battery pack | |
| EP2512846B1 (en) | Vehicle control apparatus and vehicle control method | |
| JP4066361B2 (en) | Fuel cell cooling system | |
| CN107403975B (en) | A kind of energy-storage battery liquid cooling system current equalizer and method | |
| CN106463753B (en) | Electrolyte circulation type battery | |
| CN113285090B (en) | Fuel cell thermal management system and control method thereof | |
| CN109599622B (en) | Temperature adjusting method and temperature adjusting system for vehicle-mounted battery | |
| JP2016018607A (en) | Fuel battery system and control method for the same | |
| CN109599634B (en) | Temperature adjusting method and temperature adjusting system for vehicle-mounted battery | |
| CN108336445A (en) | Battery pack heat management system and battery pack | |
| CN111244572A (en) | Battery pack temperature difference control system, control method and electronic equipment | |
| WO2014075303A1 (en) | Thermal equilibrium set and control method and control apparatus thereof | |
| CN112599885A (en) | Control method of liquid cooling system and liquid cooling system | |
| CN116799367A (en) | Energy storage system and temperature adjustment method | |
| CN116470187A (en) | Battery cell temperature equalizing system and method suitable for immersed liquid cooling energy storage system | |
| CN114188566A (en) | Control method and system of thermal management system, thermal management system and fuel cell | |
| CN114530649A (en) | Temperature adjustment method, temperature adjustment system and computer readable storage medium | |
| CN111129538B (en) | Fuel cell stack cooling system, control method thereof, automobile and storage medium | |
| CN218385294U (en) | Thermal management device for fuel cell | |
| CN113363528A (en) | Fuel cell thermal management system and control method thereof | |
| CN109599612B (en) | Temperature adjusting method and temperature adjusting system for vehicle-mounted battery | |
| CN111146529A (en) | Constant-temperature storage battery system | |
| CN115425260A (en) | Temperature control method for electric pile of vehicle proton exchange membrane fuel cell | |
| CN106015915B (en) | Air-conditioning system, caisson and its pressure stabilizing adjusting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant after: Sunshine New Energy Development Co.,Ltd. Address before: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant before: Sunshine New Energy Development Co.,Ltd. Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant after: Sunshine New Energy Development Co.,Ltd. Address before: 230088 2nd floor, scientific research building, sunshine power plant, No.2 Tianhu Road, high tech Zone, Hefei City, Anhui Province Applicant before: HEFEI SUNGROW RENEWABLE ENERGY SCI. & TECH. Co.,Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210402 |