CN114520385A

CN114520385A - Distributed energy storage system and control method thereof

Info

Publication number: CN114520385A
Application number: CN202210242608.XA
Authority: CN
Inventors: 柳家庆
Original assignee: Sungrow Energy Storage Technology Co Ltd
Current assignee: Sungrow Energy Storage Technology Co Ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-05-20

Abstract

The invention discloses a distributed energy storage system and a control method thereof, wherein the distributed energy storage system comprises a plurality of energy storage cabinets and independently arranged heat exchange devices, energy storage devices and heat exchange channels are arranged in each energy storage cabinet, the heat exchange devices are provided with interface components, the heat exchange channels of the energy storage cabinets are connected in parallel to the interface components, and the heat exchange devices provide heat exchange media for the heat exchange channels through the interface components. The heat exchange devices in the distributed energy storage system are independently arranged, so that mutual interference does not exist in structural design, transportation and the like of the heat exchange devices and the energy storage cabinet, and the performance of the heat exchange devices and the energy storage cabinet is guaranteed.

Description

Distributed energy storage system and control method thereof

Technical Field

The invention relates to the technical field of heat exchange, in particular to a distributed energy storage system and a control method thereof.

Background

At present, the cooling device that energy storage battery cabinet supporting used is integrated inside every battery cabinet generally, and its shortcoming lies in: 1) in a large-scale energy storage battery centralized installation scene, the number of battery cabinets is large, and each battery cabinet is integrated with one or more cooling devices, so that the number of matched cooling devices is increased in equal proportion, and the cost is overhigh; 2) the battery cabinet and the cooling device must be transported integrally, and the transportation scheme is not flexible; 3) the cooling device is positioned in the battery cabinet body, so that the space utilization rate of the battery cabinet is reduced; 4) the cooling device increases the whole weight of the battery cabinet, so that the mass energy density of the energy storage battery is greatly reduced; 5) the cooling device is limited by size and installation in the battery cabinet, and the heat dissipation environment is poor, so that the energy efficiency ratio of the cooling device is low, the power consumption is increased, and the energy efficiency of the energy storage system is reduced; 6) the cooling device is limited by an installation space, and a scroll compressor and a heat exchanger with a smaller size are generally adopted, so that the refrigerating capacity is smaller, the peak heat load of an energy storage battery cannot be inhibited, the temperature of the battery is in a higher interval, and the service life and the safety of the battery are influenced; 7) the cooling device is positioned in the battery cabinet body, the manual operation space is small, and the maintenance difficulty is high.

Therefore, how to provide a solution to overcome at least some of the above-mentioned drawbacks still remains a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide a distributed energy storage system and a control method thereof, wherein a heat exchange device of the distributed energy storage system is independently arranged, so that the mutual interference between the heat exchange device and an energy storage cabinet in structural design, transportation and the like does not exist, and the performance of the heat exchange device and the energy storage cabinet is favorably ensured.

In order to solve the technical problem, the invention provides a distributed energy storage system which comprises a plurality of energy storage cabinets and independently arranged heat exchange devices, wherein each energy storage cabinet is internally provided with an energy storage device and a heat exchange channel, each heat exchange device is provided with an interface component, the heat exchange channels of the energy storage cabinets are connected in parallel to the interface components, and the heat exchange devices provide heat exchange media for the heat exchange channels through the interface components.

Different from the conventional design, the heat exchange device of the distributed energy storage system provided by the invention is independently arranged, so that the distributed energy storage system at least has the following technical advantages: 1) in the scene of centralized installation of the energy storage cabinets, one set of heat exchange device can meet the heat exchange requirement of the energy storage cabinet in one area, the number of the heat exchange devices can be greatly reduced, communication control is facilitated to be simplified, and cost can be reduced; 2) the heat exchange device and the energy storage cabinet can be transported separately, so that the transportation scheme is more flexible; 3) the energy storage cabinet and the heat exchange device are mutually independent and cannot be influenced, and the structural design of the energy storage cabinet and the heat exchange device can be simplified; 4) the heat exchange device is separated from the energy storage cabinet, so that more energy storage devices can be assembled in the energy storage cabinet with the same volume, and the volume energy density and the mass energy density of the energy storage cabinet can be improved; 5) the model selection design of the heat exchange device is not influenced by the internal space of the energy storage cabinet, and in specific practice, a high-power heat exchange device can be selected according to needs to improve the heat exchange performance and further meet the heat exchange requirement of the energy storage cabinet; 6) the peripheral space of heat transfer device can enlarge, and this can make things convenient for manual operation to do benefit to the maintenance in later stage.

Optionally, each heat exchange channel is provided with a switch valve; the energy storage cabinet is characterized by further comprising a controller, a plurality of device temperature detection components are arranged in each energy storage cabinet and used for detecting the device temperature of the energy storage devices, and the controller is in signal connection with each switch valve and each device temperature detection component.

Optionally, the heat exchange device comprises a medium circuit provided with a medium tank and a medium pump.

Optionally, the maximum temperature difference of the device temperatures measured by the device temperature detection components of the energy storage cabinet is greater than a set temperature difference, and the maximum value of the device temperatures measured by the device temperature detection components is smaller than a first device temperature or the minimum value of the device temperatures measured by the device temperature detection components is smaller than a second device temperature, the controller can control the medium pump to start and control the corresponding switch valve to open; the first device temperature is greater than the second device temperature.

Optionally, the medium circuit is provided with a first heat exchanger, and the heat exchange device further includes a first air supply component, and the first air supply component is used for providing heat exchange air for the first heat exchanger.

Optionally, the medium loop includes a main loop and a first heat exchange loop, the first heat exchange loop is connected to the main loop in parallel through a first three-way valve, and the first heat exchanger is located in the first heat exchange loop.

Optionally, the medium loop is further provided with a first medium temperature detection component for detecting an outflow temperature of the heat exchange medium; the distributed energy storage system also comprises an ambient temperature detection component used for detecting the ambient temperature; when the maximum value of the device temperature measured by the device temperature detection component of the energy storage cabinet is greater than or equal to a first device temperature, and the environment temperature is less than the outflow temperature, the controller controls the medium pump, the first air supply component and the corresponding switch valve to be started; when the minimum value of the device temperature measured by the device temperature detection component of the energy storage cabinet is less than or equal to a second device temperature, and the environment temperature is greater than the outflow temperature, the controller controls the medium pump, the first air supply component and the corresponding switch valve to be started; the first device temperature is greater than the second device temperature.

Optionally, the heat exchange device further comprises a forced heat exchange mechanism, and the forced heat exchange mechanism is used for exchanging heat with the heat exchange medium.

Optionally, the forced heat exchange mechanism includes a second heat exchange loop and a second heat exchanger, the second heat exchange loop is provided with a compressor, a condenser and an evaporator, and a heat exchange medium in the medium loop exchanges heat with the condenser or the evaporator through the second heat exchanger.

Optionally, the forced heat exchange mechanism further comprises a second air supply component for providing heat exchange air for the condenser or the evaporator.

Optionally, the forced heat exchange mechanism further comprises a heater, and the heater is arranged in the medium loop.

Optionally, the medium loop is further provided with a first medium temperature detection component for detecting an outflow temperature of the heat exchange medium; the distributed energy storage system also comprises an ambient temperature detection component used for detecting the ambient temperature; when the maximum value of the device temperature measured by the device temperature detection component of the energy storage cabinet is greater than or equal to a first device temperature and the ambient temperature is greater than or equal to the outflow temperature, the controller controls the medium pump, the forced heat exchange mechanism and the corresponding switch valve to be started; the minimum value of the device temperature detected by the device temperature detection component of the energy storage cabinet is less than or equal to a second device temperature, the environment temperature is less than or equal to the outflow temperature, and the controller controls the medium pump, the forced heat exchange mechanism and the corresponding switch valve to be started.

Optionally, the medium circuit includes a main circuit and an energy storage circuit, the medium tank is located in the energy storage circuit, and two ends of the energy storage circuit are respectively connected to the main circuit in parallel through a one-way valve and a second three-way valve.

Optionally, the medium loop is further provided with a second medium temperature detection component for detecting the reflux temperature of the heat exchange medium; when the forced heat exchange mechanism is in a refrigeration mode and the return temperature is lower than the first return temperature, the controller can control the opening degree of the second three-way valve to enable the heat exchange medium to partially flow into the medium box for energy storage; when the reflux temperature is lower than a second reflux temperature, the controller can control the forced heat exchange mechanism to stop and control the heat exchange medium in the medium box to participate in heat exchange; the first reflux temperature is greater than the second reflux temperature; when the forced heat exchange mechanism is in a heating mode and the return temperature is higher than a third return temperature, the controller can control the opening of the second three-way valve so that the heat exchange medium partially flows into the medium tank to store energy; when the reflux temperature is higher than the fourth reflux temperature, the controller can control the forced heat exchange mechanism to stop and control the heat exchange medium in the medium box to participate in heat exchange; the third reflow temperature is less than the fourth reflow temperature.

The invention also provides a control method of the distributed energy storage system, which is suitable for the distributed energy storage system, and the control method comprises the following steps: step S1, acquiring the device temperature of the energy storage cabinet; and step S2, adjusting the on-off of the heat exchange device and each heat exchange channel at least according to the device temperature.

By adopting the scheme, whether the heat exchange requirement exists inside each energy storage cabinet can be judged by obtaining the temperature of each device, and if the heat exchange requirement exists, the heat exchange device can be controlled to provide a heat exchange medium in the heat exchange channel of the energy storage cabinet so as to control the internal temperature of the energy storage cabinet.

Optionally, the heat exchange device includes a medium loop, the medium loop is provided with a medium tank and a medium pump, and step S2 specifically includes: step S210, calculating the maximum temperature difference of the temperatures of the devices in the energy storage cabinet; step S211, judging whether the maximum temperature difference is larger than a set temperature difference, if so, executing the following step S212; step S212, judging whether the maximum value in the device temperatures is smaller than a first device temperature or whether the minimum value in the device temperatures is smaller than a second device temperature, if so, executing the following step S213; and step S213, controlling the medium pump to start, and controlling the corresponding heat exchange channel to be communicated with the heat exchange device.

Optionally, the heat exchange device comprises a medium loop, the medium loop is provided with a medium tank, a medium pump and a first heat exchanger, and the heat exchange device further comprises a first air supply component, and the first air supply component is used for providing heat exchange air for the first heat exchanger; the step S2 specifically includes: step S220, obtaining the outflow temperature and the ambient temperature of the heat exchange medium; step S221, determining whether a maximum value of the device temperatures is greater than or equal to a first device temperature and the ambient temperature is less than the outflow temperature, if so, executing step S223; step S222, judging whether the minimum value in the device temperatures is smaller than a second device temperature and the environment temperature is larger than the outflow temperature, if so, executing the following step S223; and step S223, controlling the medium pump and the first air supply part to be started, and controlling the corresponding heat exchange channel to be communicated with the heat exchange device.

Optionally, the heat exchange device comprises a medium loop, the medium loop is provided with a medium tank and a medium pump, and the heat exchange device further comprises a forced heat exchange mechanism, and the forced heat exchange mechanism is used for exchanging heat with a heat exchange medium in the medium loop; the step S2 specifically includes: step S230, obtaining the outflow temperature and the ambient temperature of the heat exchange medium; step S231, determining whether a maximum value of the device temperatures is greater than or equal to a first device temperature and the ambient temperature is greater than or equal to the outflow temperature, if so, executing step S233 below; step S232, determining whether the minimum value of the device temperatures is less than or equal to a second device temperature and the ambient temperature is less than or equal to the outflow temperature, if so, performing step S233 below; and step S233, controlling the medium pump and the forced heat exchange mechanism to be started, and controlling the corresponding heat exchange channel to be communicated with the heat exchange device.

Optionally, the medium circuit includes a main circuit and an energy storage circuit, the medium tank is located in the energy storage circuit, and the step S2 specifically includes: step S240, obtaining the reflux temperature of the heat exchange medium; step S241, determining whether the reflux temperature is lower than a first reflux temperature or whether the reflux temperature is higher than a third reflux temperature, if so, executing step S242; step S242, controlling the heat exchange medium to partially flow into the medium tank; step S243, determining whether the reflux temperature is lower than the second reflux temperature or whether the reflux temperature is higher than the fourth reflux temperature, if yes, executing step S244; step S244, controlling the forced heat exchange mechanism to stop, controlling the heat exchange medium in the medium box to participate in heat exchange, and controlling the corresponding heat exchange channel to be communicated with the heat exchange device; the second reflux temperature is less than the first reflux temperature, and the fourth reflux temperature is greater than the third reflux temperature.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a distributed energy storage system according to the present invention;

FIG. 2 is a schematic structural view of one embodiment of the heat exchange device of FIG. 1;

FIG. 3 is a schematic structural view of another embodiment of the heat exchange device in FIG. 1;

fig. 4 is a schematic flow chart of a control method of the distributed energy storage system provided by the present invention;

FIG. 5 is a flowchart illustrating the first embodiment of step S2;

FIG. 6 is a flowchart illustrating a second embodiment of step S2;

FIG. 7 is a flowchart illustrating a third embodiment of step S2;

fig. 8 is a flowchart illustrating a fourth embodiment of step S2.

The reference numerals in fig. 1-8 are illustrated as follows:

1, an energy storage cabinet and 11 switching valves;

2 heat exchange device, 21 interface component, 22 medium loop, 221 medium pump, 222 first heat exchange loop, 222a first heat exchanger, 222b first air supply component, 222c first three-way valve, 223 heater, 224 energy storage loop, 224a medium box, 224b one-way valve, 224c second three-way valve, 23 second heat exchange loop, 231 compressor, 232 condenser, 233 second air supply component, 234 throttling component, 24 second heat exchanger, 25 shell.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

As used herein, the term "plurality" refers to an indefinite plurality, usually more than two; and when the term "plurality" is used to indicate a quantity of a particular element, it does not indicate a quantitative relationship between the elements.

The terms "first," "second," and the like, herein are used for convenience in describing two or more structures or components that are identical or similar in structure and/or function and do not denote any particular limitation in order and/or importance.

Example one

As described in the background art, a cooling device used in cooperation with a conventional energy storage battery cabinet is generally integrated inside the battery cabinet, and in a scene where the energy storage battery cabinet is intensively arranged, the number of the cooling device is large, and the cooling device occupies the internal space of the energy storage battery cabinet, so that the space utilization rate, the energy efficiency and the like of the energy storage battery cabinet are reduced; meanwhile, the weight and the volume of the energy storage battery cabinet can be increased, which can cause adverse effects on the installation and transportation of the energy storage battery cabinet; and, receive the restriction of energy storage battery cabinet inner space, cooling device's volume can be less, and cooling device's radiating environment is relatively poor for cooling device's heat transfer performance also can descend, and cooling efficiency is lower, simultaneously, still is unfavorable for the maintenance.

Therefore, the present invention provides a distributed energy storage system, and specifically refer to fig. 1 to fig. 3, fig. 1 is a schematic structural diagram of an embodiment of the distributed energy storage system provided in the present invention, fig. 2 is a schematic structural diagram of an embodiment of a heat exchange device in fig. 1, and fig. 3 is a schematic structural diagram of another embodiment of the heat exchange device in fig. 1.

As shown in fig. 1, the distributed energy storage system includes a plurality of energy storage cabinets 1, where the energy storage cabinets 1 may specifically be energy storage battery cabinets as indicated above. All be provided with energy storage device in each energy storage cabinet 1, the type of energy storage device is relevant with the type of energy storage cabinet 1, take the aforesaid energy storage battery cabinet as an example, this energy storage device specifically can be monomer electricity core. Each energy storage device needs to work at a proper temperature, and the proper temperature is not too high or too low, so that each energy storage device has heat exchange requirements. The number of energy storage devices provided in each energy storage cabinet 1 is not limited herein.

Still be provided with the heat transfer passageway in each energy storage cabinet 1, this heat transfer passageway specifically can be some pipeline designs for introduce heat transfer medium, can carry out the heat transfer to the energy storage device in the energy storage cabinet 1, guarantee as far as possible that each energy storage device all can work under the temperature that relatively suits, thereby can guarantee each energy storage device's work efficiency.

The distributed energy storage system further comprises a heat exchange device 2, and the heat exchange device 2 can be independent of the energy storage cabinets 1. The heat exchange device 2 is provided with an interface component 21, the heat exchange channels of the energy storage cabinets 1 are connected into the interface component 21 in parallel, and the heat exchange device 2 can directly provide heat exchange media for the heat exchange channels through the interface component 21.

Different from the conventional design, the heat exchange device 2 of the distributed energy storage system provided in this embodiment is independently arranged, so that at least the following technical advantages can be achieved: 1) in a scene that the energy storage cabinets 1 are installed in a centralized mode, one set of heat exchange devices 2 can meet the heat exchange requirements of the energy storage cabinets 1 in one area, the number of the heat exchange devices can be greatly reduced, communication control is facilitated to be simplified, and cost can be reduced; 2) the heat exchange device 2 and the energy storage cabinet 1 can be transported separately, so that the transportation scheme is more flexible; 3) the energy storage cabinet 1 and the heat exchange device 2 are independent from each other, so that no influence is generated between the energy storage cabinet and the heat exchange device, and the structural design of the energy storage cabinet and the heat exchange device can be simplified; 4) the heat exchange device 2 is separated from the energy storage cabinet 1, so that more energy storage devices can be assembled on the energy storage cabinet 1 with the same volume, and the volume energy density and the mass energy density of the energy storage cabinet 1 can be improved; 5) the model selection design of the heat exchange device 2 is not influenced by the internal space of the energy storage cabinet 1, and in specific practice, a high-power heat exchange device can be selected according to needs to improve the heat exchange performance and further meet the heat exchange requirement of the energy storage cabinet 1; 6) the peripheral space of heat transfer device 2 can enlarge, and this can make things convenient for manual operation to do benefit to the maintenance of later stage.

Here, the present embodiment does not limit the kind of the heat exchange medium provided by the heat exchange device 2, and the heat exchange medium may be a liquid medium or a gaseous medium. As an exemplary scheme, in this embodiment, a liquid medium may be used as a heat exchange medium, and compared with a gaseous medium, the liquid medium has a stronger heat exchange capability and a higher heat exchange efficiency; the liquid medium may be various, which is determined by the need of heat exchange, for example, the liquid medium may be water, glycol solution, sodium chloride solution, etc.

The heat exchange device 2 can provide heat exchange medium to each energy storage cabinet 1 in a uniform supply manner. At this time, a main valve may be provided, and when the main valve is opened, the heat exchange device 2 may uniformly provide a heat exchange medium to each energy storage cabinet 1; when the main valve is closed, the heat exchange medium 2 does not provide heat exchange medium for any energy storage cabinet 1; the control process of this solution is relatively simple.

Besides, the heat exchange device 2 can provide the heat exchange medium to each energy storage cabinet 1 independently. At this time, each heat exchange channel can be provided with a switch valve 11, and the opening and closing of different switch valves 11 can realize the connection and disconnection between the heat exchange device 2 and the heat exchange channels of different energy storage cabinets 1, so that the independent control of each energy storage cabinet 1 can be realized; like this, more be favorable to determining whether to let in heat transfer medium to corresponding energy storage cabinet 1 according to each energy storage cabinet 1's particular case, the precision of control can be higher, also can reduce the waste of energy.

Further, the distributed energy storage system provided by the present invention may further include a controller (not shown in the figure), each energy storage cabinet 1 may be provided with a plurality of device temperature detection components for detecting the device temperature of the energy storage device, and the controller may be in signal connection with each switching valve 11 and each device temperature detection component for controlling the on/off of each switching valve 11 according to the device temperature detected by each device temperature detection component. The type of the device temperature detecting means is not limited herein as long as the function of temperature detection can be achieved, and for example, it may be a thermocouple temperature sensor, a thermistor temperature sensor, an infrared temperature sensor, or the like; this is also applicable to other temperature detecting members mentioned later, and will not be emphasized one by one hereinafter.

The number of the energy storage devices arranged in each energy storage cabinet 1 can also be multiple, and the device temperature detection components and the energy storage devices can be in one-to-one correspondence, so that each device temperature detection component can detect the device temperature of one energy storage device. Or, there may be a many-to-one relationship between the device temperature detection component and the energy storage device, and at this time, the device temperature detected by each device temperature detection component may actually be temperature values at different positions of the same energy storage device. Both embodiments may be employed in particular practice.

In fact, it is also possible to arrange a device temperature detection component in each energy storage cabinet 1.

It should be noted that, in this embodiment, the specific structural form of the heat exchanging device 2 is not limited, and in practical application, a person skilled in the art may design the heat exchanging device according to specific needs as long as the requirements of use can be met.

In some alternative embodiments, as shown in fig. 2, the heat exchange device 2 may comprise a medium circuit 22, and the medium circuit 22 may be provided with a medium tank 224a and a medium pump 221. The medium tank 224a stores a heat exchange medium, and under the action of the medium pump 221, the heat exchange medium in the medium tank 224a can be provided into the heat exchange channel of the corresponding energy storage cabinet 1 to exchange heat for the energy storage device. In addition, when the heat exchange medium flows in the heat exchange channel, the temperature of each energy storage device (or the temperature of different parts of the same energy storage device) in the energy storage cabinet 1 can be balanced.

For one energy storage cabinet 1, the temperature difference of the device temperatures measured by the device temperature detection components in the energy storage cabinet 1 can be calculated, the maximum temperature difference is compared with the set temperature difference, and if the maximum temperature difference is larger than the set temperature difference, the temperature difference in the energy storage cabinet 1 is too large.

If the heat exchanger 2 is a refrigeration device, at this time, the maximum value of the device temperature (i.e., the maximum device temperature) measured by the device temperature detecting unit may be compared with the first device temperature. If the maximum device temperature is lower than the first device temperature, it indicates that the temperature inside the energy storage cabinet 1 is not too high, and the controller may control the medium pump 221 to start and may control the corresponding switch valve to open so as to introduce the heat exchange medium into the corresponding energy storage cabinet 1. The inside temperature of energy storage cabinet 1 can be balanced when heat transfer medium flows in energy storage cabinet 1 to make the inside difference in temperature of energy storage cabinet 1 maintain within setting for the difference in temperature scope, and then can guarantee the equilibrium of inside temperature. The operation mode of the heat exchange device 2 can be called as a self-circulation mode, no other external energy is added in the mode, the technical purpose of balancing the internal temperature of the energy storage cabinet 1 can be achieved only by means of flowing of a heat exchange medium in the energy storage cabinet 1, and energy consumption is low.

Similarly, if the heat exchanger 2 is a heating apparatus, the minimum value of the device temperatures (minimum device temperature) detected by the device temperature detecting means may be compared with the second device temperature. If the minimum device temperature is lower than the second device temperature, the controller can control the medium pump 221 to start, and can control the corresponding switch valve to open, so as to introduce the heat exchange medium into the corresponding energy storage cabinet 1, so as to maintain the balance of the internal temperature of the energy storage cabinet 1.

It should be noted that the set temperature difference, the first device temperature, and the second device temperature are preset values, specific values of which are not explicitly defined herein, and this is actually associated with the type of the energy storage device, and in specific practice, a person skilled in the art may set the temperature difference, the first device temperature, and the second device temperature by combining experience, models, and the like as long as the heat exchange requirement can be met. The second device temperature may be lower than the first device temperature in consideration of the difference between the heating and cooling conditions.

In other alternative embodiments, the medium circuit 22 may also be provided with a first heat exchanger 222a, and the structural form of the first heat exchanger 222a may not be limited; the heat exchanging device 2 may further include a first air supply part 222b, and the first air supply part 222b is used for providing heat exchanging air for the first heat exchanger 222a so as to exchange heat with the heat exchanging medium in the medium loop 22 by means of air in the environment. The first air supply part 222b may be a fan.

The first heat exchanger 222a may be arranged on the main loop of the medium loop 22, in which case all heat exchange medium in the medium loop 22 may pass through the first heat exchanger 222 a.

Alternatively, the medium circuit 22 may also be provided with a first heat exchange circuit 222 in parallel with the main circuit. Referring to fig. 2, one end of the first heat exchange loop 222 may be connected to the main loop, and the other end may be connected to the main loop through a first three-way valve 222 c; the aforementioned first heat exchanger 222a may be located in the first heat exchange loop 222. In this embodiment, the amount of the heat exchange medium entering the first heat exchanger 222a can be adjusted by adjusting the opening degree of the first three-way valve 222 c. In one limit, the heat exchange medium may be circulated only in the main loop and not into the first heat exchange loop 222, such as when heat exchange unit 2 is in the self-circulation mode described above; in another limit, the heat exchange medium may also be entirely fed into the first heat exchange loop 222.

With such an arrangement, by adjusting the opening of the first three-way valve 222c, the flow resistance of the heat exchange medium can be reduced, and the medium pump 221 can operate with relatively low power, which can reduce the energy consumption of the medium pump 221; in addition, the first air supply member 222b does not need to be turned on all the time, and energy consumption of the first air supply member 222b can be reduced.

In a specific implementation, the medium circuit 22 may further be provided with a first medium temperature detecting component for detecting an outflow temperature of the heat exchange medium; the distributed energy storage system may further include an ambient temperature detection component for detecting an ambient temperature. The control of the first three-way valve 222c may be based on the outflow temperature and the ambient temperature.

If the heat exchange device 2 is a refrigeration device, the maximum device temperature measured by the device temperature detection component of the energy storage cabinet 1 is still compared with the first device temperature, and if the maximum device temperature is greater than or equal to the first device temperature, it indicates that the temperature inside the energy storage cabinet 1 is too high, and the internal temperature of the energy storage cabinet 1 is difficult to control only by the self-circulation mode. At this time, if the ambient temperature is lower than the outflow temperature, the controller may control the medium pump 221 and the corresponding switch valve 11 to start, so as to introduce the heat exchange medium into the corresponding energy storage cabinet; in addition, the controller may further adjust an opening degree of the first three-way valve 222c to introduce at least part of the heat exchange medium into the first heat exchange loop 222; further, the controller may control the first air supply part 222b to be opened to cool the heat exchange medium flowing through the first heat exchanger 222 a. The operation mode of the heat exchange device 2 can be called as an air heat exchange mode, heat exchange can be carried out on a heat exchange medium by means of cold/heat in the natural environment, the heat exchange capacity of the heat exchange device 2 is higher than that of the self-circulation mode, and the energy consumption is lower.

Similarly, if the heat exchange device 2 is a heating device, the minimum device temperature detected by the device temperature detecting component of the energy storage cabinet 1 may be compared with the second device temperature. If the minimum device temperature is lower than the second device temperature and the environment temperature is higher than the outflow temperature, the controller may control the medium pump 221 and the corresponding switch valve 11 to start up, so as to introduce the heat exchange medium into the corresponding energy storage cabinet 1; in addition, the controller may further adjust an opening degree of the first three-way valve 222c, so that at least a portion of the heat exchange medium may be introduced into the first heat exchange loop 222; further, the controller may also control the first air supply part 222b to be activated to heat the air of the heat exchange medium flowing through the first heat exchanger 222 a.

In still other alternative embodiments, the heat exchange device 2 provided by the present invention may further include a forced heat exchange mechanism, where the forced heat exchange mechanism is used for exchanging heat with a heat exchange medium, and may further improve the heat exchange performance of the heat exchange device 2.

Here, the embodiment does not limit the specific structural form of the forced heat exchange mechanism, and in practical application, a person skilled in the art may determine the forced heat exchange mechanism according to actual needs as long as the requirement of use can be met. For example, the forced heat exchange mechanism may be a conventional mechanical heat exchange mechanism, a compressor heat exchange mechanism, or the like.

Taking a compressor heat exchange mechanism as an example, the forced heat exchange mechanism may include a second heat exchange circuit 23 and a second heat exchanger 24, and the second heat exchange circuit 23 may be provided with a compressor 231, a condenser 232, an evaporator, a throttling part 234, and the like. The second heat exchanger 24 may be a plate heat exchanger, and the like, and two isolated flow paths capable of performing heat exchange may be arranged inside the second heat exchanger, and the medium loop 22 and the second heat exchange loop 23 may be respectively connected to the two flow paths; in this way, the heat exchange medium in the medium circuit 22 can exchange heat with the condenser 232 or the evaporator in the second heat exchanger 24. If the heat exchange is carried out with the condenser 232, the forced heat exchange mechanism is used for heating; if the heat exchange is carried out with the evaporator, the forced heat exchange mechanism is used for refrigerating.

Further, the forced heat exchange mechanism may further include a second air supply component 233, and the second air supply component 233 may specifically be a fan, and is configured to provide heat exchange air for the condenser 232 or the evaporator, so as to assist the condenser 232 or the evaporator to work.

If the heat exchange device 2 is a refrigerating device, the maximum device temperature measured by the device temperature detection component of the energy storage cabinet 1 is still taken to be compared with the first device temperature. If the temperature of the first device is greater than or equal to the temperature of the first device and the ambient temperature is greater than or equal to the outflow temperature, it indicates that the temperature inside the energy storage cabinet 1 is too high and the ambient temperature is too high, and it is difficult to control the temperature inside the energy storage cabinet 1 only in the self-circulation mode or the air heat exchange mode. At this time, the controller may control the medium pump 221 and the corresponding switch valve 11 to start, so as to introduce the heat exchange medium into the corresponding energy storage cabinet 1; and, the controller can also control the forced heat exchange mechanism to be started to perform forced cooling on the heat exchange medium in the medium loop 22 through the evaporator. The operation mode of the heat exchange device 2 can be called as a forced heat exchange mode, heat exchange can be carried out on a heat exchange medium by means of a forced heat exchange mechanism, and the heat exchange capacity of the heat exchange device 2 is higher than that of the self-circulation mode and the air heat exchange mode.

Similarly, if the heat exchange device 2 is a heating device, the minimum device temperature detected by the device temperature detection component of the energy storage cabinet 1 may be compared with the second device temperature. If the minimum device temperature is less than or equal to the second device temperature and the ambient temperature is less than or equal to the outflow temperature; the controller may control the medium pump 221, the forced heat exchange mechanism, and the corresponding switch valve 11 to be activated to deliver the heat exchange medium forcibly heated by the condenser 232 to the corresponding energy storage cabinet 1.

If the above-mentioned forced heat exchanging means is not a compressor heat exchanging means, for example, it is a heater 223 in the form of an electric heater part, a waste heat exchanging part, or the like, the heater 223 may be directly provided in the medium circuit 22. This embodiment can be seen in fig. 3, in which case the second heat exchange circuit 23 can be omitted and the form of the heat exchange device 2 in this embodiment can be simplified.

The forced heat exchange mechanism can generate a large amount of heat exchange quantity in a short time, and if the heat exchange quantity exceeds the current heat exchange requirement, energy waste can be possibly caused. To this end, in the present embodiment, the medium circuit 22 may further include an energy storage circuit 224, the aforementioned medium tank 224a may be located in the energy storage circuit 224, and both ends of the energy storage circuit 224 may be connected in parallel to the main circuit through a one-way valve 224b and a second three-way valve 224c, respectively; when the amount of heat exchange exceeds the current demand, the controller may adjust the opening of the second three-way valve 224c to store the excess amount of heat exchange in the medium tank 224a for later use. At this time, the medium box 224a is required to have a certain heat insulation capability to reduce heat exchange between the medium box 224a and the external environment; specifically, the inner wall or the outer wall of the medium box 224a may be provided with a heat insulating material, a heat insulating layer, or the like.

In specific implementation, the medium loop 22 may further be provided with a second medium temperature detecting component for detecting a reflux temperature of the heat exchange medium, and through a magnitude of the reflux temperature, it may be determined whether there is a problem of an excessive heat exchange amount.

If the heat exchange device 2 is a refrigeration device (the forced heat exchange mechanism is in a refrigeration mode), if the reflux temperature is lower than the first reflux temperature, the controller can control the opening degree of the second three-way valve 224c to enable the heat exchange medium to partially flow into the medium tank 224a for energy storage; if the reflux temperature is lower than the second reflux temperature, the controller can control the forced heat exchange mechanism to stop and control the heat exchange medium in the medium box 224a to participate in heat exchange so as to utilize the heat exchange amount stored in the medium box 224 a. The first reflux temperature is greater than the second reflux temperature. This mode of operation of the heat exchange device 2 is referred to as the charging mode.

If the heat exchange device 2 is a heating device (the forced heat exchange mechanism is in a heating mode), if the return temperature is higher than the third return temperature, the controller can control the opening of the second three-way valve 224c to enable the heat exchange medium to partially flow into the medium tank 224a for energy storage; if the reflux temperature is higher than the fourth reflux temperature, the controller can control the forced heat exchange mechanism to stop and control the heat exchange medium in the medium box 224a to participate in heat exchange so as to utilize the heat exchange amount stored in the medium box 224 a. The third reflow temperature here is less than the fourth reflow temperature.

Similar to the set temperature difference, the first device temperature and the second device temperature, the first reflux temperature, the second reflux temperature, the third reflux temperature and the fourth reflux temperature mentioned herein are also preset values, and specific values thereof are not specifically limited herein. The third return temperature may be greater than the first return temperature to account for differences in cooling and heating conditions.

In combination with the above description, the heat exchange device 2 of the distributed energy storage system provided by the present invention has four working modes, which are a self-circulation mode, an air heat exchange mode, a forced heat exchange mode and an energy storage mode, and in actual use, the working modes of the heat exchange device 2 can be switched according to specific situations to meet heat exchange requirements under different situations.

As shown in fig. 2 and 3, the heat exchange device 2 may further include a housing 25, and the medium circuit 22, the second heat exchange circuit 23, the second heat exchanger 24, and the like may be integrated inside the housing 25.

Example two

Referring to fig. 4 to 8, fig. 4 is a schematic flowchart of a control method of a distributed energy storage system according to the present invention, fig. 5 is a schematic flowchart of a first embodiment of step S2, fig. 6 is a schematic flowchart of a second embodiment of step S2, fig. 7 is a schematic flowchart of a third embodiment of step S2, and fig. 8 is a schematic flowchart of a fourth embodiment of step S2.

The invention further provides a control method of the distributed energy storage system, and the control method is suitable for the distributed energy storage system related to each implementation mode of the first embodiment. Thus, the descriptions of the structure, the technical effect, and the related parameters (such as the first device temperature and the second device temperature) of the distributed energy storage system in the first embodiment are also applicable to the present embodiment, and the descriptions may be specifically referred to in the description of a part of the embodiment, and the present embodiment is not explained one by one.

As shown in fig. 4, the control method of this embodiment may specifically include the following steps: step S1, acquiring the device temperature of the energy storage cabinet 1; and step S2, adjusting the on-off of the heat exchange device 2 and each heat exchange channel at least according to the temperature of the device.

The acquisition of device temperature can be through the device temperature detection part mentioned in embodiment one, through the acquisition of each device temperature, can judge whether each energy storage cabinet 1 is inside to have the heat transfer demand, if there is the heat transfer demand, can control heat transfer device 2 and provide heat transfer medium in to the heat transfer passageway of energy storage cabinet 1 to control the inside temperature of energy storage cabinet 1.

As described in the embodiments section, such control may be uniform or may be separate. If the control is unified, only the temperature of a device in one energy storage cabinet 1 needs to be acquired, and then whether a heat exchange medium needs to be supplied to each energy storage cabinet 1 is determined based on the temperature of the device; of course, the device temperatures of all the energy storage cabinets 1 may be obtained, but as long as one of the device temperatures represents that there is a heat exchange requirement, the heat exchange medium may be supplied to each energy storage cabinet 1. If for independent control, then can judge specifically which energy storage cabinet 1 has the heat transfer demand according to the device temperature of each energy storage cabinet 1, then can pertinence ground control have the heat transfer passageway of the energy storage cabinet 1 of heat transfer demand to be linked together with heat transfer device 2, and then provide heat transfer medium to the energy storage cabinet 1 that has the heat transfer demand selectively, the waste of energy can be reduced to this kind of mode, is the preferred scheme of this embodiment.

As described in a part of the embodiment, the distributed energy storage system has four working modes, namely, a self-circulation mode, an air heat exchange mode, a forced heat exchange mode, and an energy storage mode.

In the self-circulation mode, as shown in fig. 5, the step S2 may specifically include: step S210, calculating the maximum temperature difference of the temperatures of all devices in the energy storage cabinet 1, wherein the calculation is performed on the temperatures of all devices in the same energy storage cabinet 1 and is not performed among different energy storage cabinets 1; step S211, determining whether the maximum temperature difference is greater than a set temperature difference, if so, indicating that the internal temperature difference of the energy storage cabinet 1 is too large, and performing the following step S212; step S212, determining whether the maximum value of the device temperatures is less than a first device temperature (corresponding to the heat exchanger 2 being a cooling device), or whether the minimum value of the device temperatures is less than a second device temperature (corresponding to the heat exchanger 2 being a heating device), if yes, performing step S213; step S213, controlling the medium pump 221 to start, and controlling the corresponding heat exchange channel to communicate with the heat exchange device 2.

Under this kind of mode, other external energy is not introduced, and when heat transfer medium flowed in corresponding energy storage cabinet 1 is inside, can absorb the heat of high-temperature region, in order to heat the low temperature district, perhaps can absorb the cold volume of low temperature region, in order to cool down the high temperature district to can realize the technical purpose of balanced energy storage cabinet 1 inside temperature, make the inside difference in temperature of energy storage cabinet 1 can maintain within setting for the difference in temperature scope, and then can ensure the good operation of each energy storage device.

In the air heat exchange mode, as shown in fig. 6, the step S2 may specifically include: step S220, obtaining the outflow temperature of the heat exchange medium and the ambient temperature; step S221, determining whether the maximum value of the device temperatures is greater than or equal to the first device temperature and the ambient temperature is less than the outflow temperature (corresponding to the heat exchanger 2 being a refrigeration device), if so, executing step S223, where the maximum value of the device temperatures is also selected for a plurality of device temperatures measured in one energy storage cabinet 1; step S222, determining whether the minimum value of the device temperatures is less than or equal to the second device temperature and the ambient temperature is greater than the outflow temperature (corresponding to the heat exchange device 2 being a heating device), if so, executing step S223, where the minimum value of the device temperatures is also selected for a plurality of device temperatures measured in one energy storage cabinet 1; in step S223, the medium pump 221 and the first air supply part 222b are controlled to be started, and the corresponding heat exchange channels are controlled to be communicated with the heat exchange device 2.

At this time, at least a part of the medium circuit 22 can exchange heat with air through the first heat exchanger 222a and the first air supply member 222b, and can cool (heat) the heat exchange medium by using natural cold (heat); the heat exchange capacity of the heat exchange device 2 in the mode is higher than that of the self-circulation mode, and the heat exchange requirement of the energy storage cabinet 1 can be better met.

In the forced heat exchange mode, as shown in fig. 7, the step S2 may specifically include: step S230, obtaining the outflow temperature of the heat exchange medium and the ambient temperature; step S231, determining whether the maximum value of the device temperatures is greater than or equal to the first device temperature and the ambient temperature is greater than or equal to the outflow temperature (corresponding to the heat exchanging device 2 being a refrigeration device), if so, executing step S233, where the maximum value of the device temperatures is also selected for a plurality of device temperatures measured in one energy storage cabinet 1; step S232, determining whether the minimum value of the device temperatures is less than or equal to the second device temperature and the ambient temperature is less than or equal to the outflow temperature (corresponding to the heat exchanging device 2 being a heating device), if so, executing step S233, where the minimum value of the device temperatures is also selected for a plurality of device temperatures measured in one energy storage cabinet 1; step S233, the medium pump 221 and the forced heat exchange mechanism are controlled to start, and the corresponding heat exchange channels are controlled to communicate with the heat exchange device 2.

At this time, the cold quantity and the heat quantity in the natural environment are not enough to exchange heat with the heat exchange medium, and the forced heat exchange mechanism can be started to provide larger heat exchange quantity. The heat exchange capacity of the heat exchange device 2 in this mode is higher than that in the air heat exchange mode. The specific structural form of the heat exchange device 2 can be referred to in the first embodiment, and will not be described repeatedly here.

Based on the forced heat exchange mode, as shown in fig. 8, the step S2 may further include: step S240, obtaining the reflux temperature of the heat exchange medium; step S241, determining whether the reflux temperature is lower than the first reflux temperature (corresponding to the heat exchanger 2 being a refrigeration device) or whether the reflux temperature is higher than the third reflux temperature (corresponding to the heat exchanger 2 being a heating device), if so, executing step S242; step S242, controlling the heat exchange medium to partially flow into the medium tank 224a to enter an energy storage mode; step S243, determining whether the return temperature is lower than the second return temperature (corresponding to the heat exchanger 2 being a refrigeration device) or whether the return temperature is higher than the fourth return temperature (corresponding to the heat exchanger 2 being a heating device), if so, executing step S244; step S244, controlling the forced heat exchange mechanism to stop, controlling the heat exchange medium in the medium box 224a to participate in heat exchange, and controlling the corresponding heat exchange channel to communicate with the heat exchange device 2; the second reflux temperature is less than the first reflux temperature, and the fourth reflux temperature is greater than the third reflux temperature.

In the forced heat exchange mode, the heat exchange amount provided by the forced heat exchange mechanism is huge, and if the heat exchange amount exceeds the current demand, a part of the heat exchange amount (cold/heat) can be stored in the medium tank 224a to enter the energy storage mode; when the forced heat exchange mechanism is stopped, the heat exchange medium in the medium box 224a can be used for heat exchange, so that the stored heat exchange amount can be utilized. Thus, the energy waste of the forced heat exchange mechanism can be reduced.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. The distributed energy storage system is characterized by comprising a plurality of energy storage cabinets (1) and independently arranged heat exchange devices (2), wherein each energy storage cabinet (1) is internally provided with an energy storage device and a heat exchange channel, each heat exchange device (2) is provided with an interface component (21), the heat exchange channels of the energy storage cabinets (1) are connected into the interface components (21) in parallel, and the heat exchange devices (2) provide heat exchange media for the heat exchange channels through the interface components (21).

2. The distributed energy storage system of claim 1, wherein each heat exchange channel is provided with a switching valve (11);

the energy storage cabinet is characterized by further comprising controllers, wherein a plurality of device temperature detection components are arranged in each energy storage cabinet (1) and used for detecting the device temperature of the energy storage devices, and the controllers are in signal connection with the switch valves (11) and the device temperature detection components.

3. Distributed energy storage system according to claim 2, wherein the heat exchanging means (2) comprises a medium circuit (22), the medium circuit (22) being provided with a medium tank (224a) and a medium pump (221).

4. The distributed energy storage system according to claim 3, wherein the maximum temperature difference of the device temperatures measured by the device temperature detection components of the energy storage cabinet (1) is greater than a set temperature difference, and the maximum value of the device temperatures measured by the device temperature detection components is smaller than a first device temperature or the minimum value of the device temperatures measured by the device temperature detection components is smaller than a second device temperature, the controller is capable of controlling the medium pump (221) to start and controlling the corresponding switch valve (11) to open; the first device temperature is greater than the second device temperature.

5. The distributed energy storage system according to claim 3, wherein the medium circuit (22) is provided with a first heat exchanger (222a), and the heat exchanging device (2) further comprises a first air supply component (222b), and the first air supply component (222b) is used for supplying heat exchanging air for the first heat exchanger (222 a).

6. The distributed energy storage system of claim 5, wherein the medium circuit (22) comprises a main circuit and a first heat exchange circuit (222), the first heat exchange circuit (222) being connected in parallel to the main circuit by a first three-way valve (222c), the first heat exchanger (222a) being located in the first heat exchange circuit (222).

7. The distributed energy storage system of claim 5, wherein the medium loop (22) is further provided with a first medium temperature detection component for detecting an outflow temperature of the heat exchange medium; the distributed energy storage system also comprises an ambient temperature detection component used for detecting the ambient temperature;

the maximum value of the device temperature measured by the device temperature detection component of the energy storage cabinet (1) is greater than or equal to a first device temperature, the ambient temperature is less than the outflow temperature, and the controller controls the medium pump (221), the first air supply component (222b) and the corresponding switch valve (11) to be started;

the minimum value of the device temperature measured by the device temperature detection component of the energy storage cabinet (1) is less than a second device temperature, and the environment temperature is greater than the outflow temperature, and the controller controls the medium pump (221), the first air supply component (222b) and the corresponding switch valve (11) to be started; the first device temperature is greater than the second device temperature.

8. The distributed energy storage system according to any one of claims 3-7, wherein the heat exchange device (2) further comprises a forced heat exchange mechanism for exchanging heat with the heat exchange medium.

9. The distributed energy storage system according to claim 8, wherein the forced heat exchange mechanism includes a second heat exchange circuit (23) and a second heat exchanger (24), the second heat exchange circuit (23) is provided with a compressor (231), a condenser (232), and an evaporator, and the heat exchange medium in the medium circuit (22) exchanges heat with the condenser (232) or the evaporator through the second heat exchanger (24).

10. The distributed energy storage system of claim 9, wherein the forced heat exchange mechanism further comprises a second air supply member (233) for supplying heat exchange air to the condenser (232) or the evaporator.

11. The distributed energy storage system of claim 8, wherein the forced heat exchange mechanism further comprises a heater (223), the heater (223) being disposed in the media loop (22).

12. The distributed energy storage system of claim 8, wherein the medium loop (22) is further provided with a first medium temperature detection component for detecting an outflow temperature of the heat exchange medium; the distributed energy storage system also comprises an ambient temperature detection component used for detecting the ambient temperature;

the maximum value of the device temperature measured by the device temperature detection component of the energy storage cabinet (1) is greater than or equal to a first device temperature, the ambient temperature is greater than or equal to the outflow temperature, and the controller controls the medium pump (221), the forced heat exchange mechanism and the corresponding switch valve (11) to be started;

The minimum value of the device temperature detected by the device temperature detection component of the energy storage cabinet (1) is less than or equal to a second device temperature, the ambient temperature is less than or equal to the outflow temperature, and the controller controls the medium pump (221), the forced heat exchange mechanism and the corresponding switch valve (11) to be started.

13. The distributed energy storage system of claim 8, wherein the medium circuit (22) comprises a main circuit and an energy storage circuit (224), the medium tank (224a) is located in the energy storage circuit (224), and two ends of the energy storage circuit (224) are respectively connected to the main circuit in parallel through a one-way valve (224b) and a second three-way valve (224 c).

14. The distributed energy storage system of claim 13, wherein the medium loop (22) is further provided with a second medium temperature detection means for detecting a return temperature of the heat exchange medium;

when the forced heat exchange mechanism is in a refrigeration mode and the return temperature is lower than a first return temperature, the controller can control the opening degree of the second three-way valve (224c) to enable the heat exchange medium to partially flow into the medium tank (224a) for energy storage; when the reflux temperature is lower than a second reflux temperature, the controller can control the forced heat exchange mechanism to stop and control the heat exchange medium in the medium box (224a) to participate in heat exchange; the first reflux temperature is greater than the second reflux temperature;

When the forced heat exchange mechanism is in a heating mode, and the return temperature is higher than a third return temperature, the controller can control the opening degree of the second three-way valve (224c) to enable the heat exchange medium to partially flow into the medium tank (224a) for energy storage; when the reflux temperature is higher than the fourth reflux temperature, the controller can control the forced heat exchange mechanism to stop and control the heat exchange medium in the medium box (224a) to participate in heat exchange; the third reflow temperature is less than the fourth reflow temperature, and the third reflow temperature is greater than the first reflow temperature.

15. A control method for a distributed energy storage system, the control method being applied to the distributed energy storage system according to any one of claims 1 to 14, the control method comprising:

step S1, acquiring the device temperature of the energy storage cabinet (1);

and step S2, the on-off of the heat exchange device (2) and each heat exchange channel is adjusted at least according to the device temperature.

16. The method for controlling a distributed energy storage system according to claim 15, wherein the heat exchanging device (2) comprises a medium circuit (22), the medium circuit (22) is provided with a medium tank (224a) and a medium pump (221), and the step S2 specifically comprises:

Step S210, calculating the maximum temperature difference of the temperature of each device in the energy storage cabinet (1);

step S211, judging whether the maximum temperature difference is larger than a set temperature difference, if so, executing the following step S212;

step S212, judging whether the maximum value in the device temperatures is less than a first device temperature or whether the minimum value in the device temperatures is less than a second device temperature, if so, executing the following step S213;

and step S213, controlling the medium pump (221) to start, and controlling the corresponding heat exchange channel to be communicated with the heat exchange device (2).

17. The control method of the distributed energy storage system according to claim 15, wherein the heat exchange device (2) comprises a medium circuit (22), the medium circuit (22) is provided with a medium tank (224a), a medium pump (221) and a first heat exchanger (222a), and the heat exchange device (2) further comprises a first air supply component (222b), and the first air supply component (222b) is used for supplying heat exchange air to the first heat exchanger (222 a); the step S2 specifically includes:

step S220, obtaining the outflow temperature and the ambient temperature of the heat exchange medium;

step S221, determining whether a maximum value of the device temperatures is greater than or equal to a first device temperature and the ambient temperature is less than the outflow temperature, if so, executing step S223;

Step S222, determining whether the minimum value of the device temperatures is less than or equal to a second device temperature and the ambient temperature is greater than the outflow temperature, if yes, performing the following step S223;

and step S223, controlling the medium pump (221) and the first air supply part (222b) to be started, and controlling the corresponding heat exchange channels to be communicated with the heat exchange device (2).

18. The control method of the distributed energy storage system according to claim 15, wherein the heat exchanging device (2) comprises a medium circuit (22), the medium circuit (22) is provided with a medium tank (224a) and a medium pump (221), and the heat exchanging device (2) further comprises a forced heat exchanging mechanism for exchanging heat with the heat exchanging medium in the medium circuit (22); the step S2 specifically includes:

step S230, obtaining the outflow temperature and the ambient temperature of the heat exchange medium;

step S231, determining whether a maximum value of the device temperatures is greater than or equal to a first device temperature and the ambient temperature is greater than or equal to the outflow temperature, if so, executing step S233 below;

step S232, determining whether the minimum value of the device temperatures is less than or equal to a second device temperature and the ambient temperature is less than or equal to the outflow temperature, if so, performing step S233 below;

And step S233, controlling the medium pump (221) and the forced heat exchange mechanism to be started, and controlling the corresponding heat exchange channels to be communicated with the heat exchange device (2).

19. The method for controlling a distributed energy storage system according to claim 18, wherein said medium circuit (22) comprises a main circuit and an energy storage circuit (224), said medium tank (224a) is located in said energy storage circuit (224), said step S2 specifically comprises:

step S240, obtaining the reflux temperature of the heat exchange medium;

step S241, determining whether the reflux temperature is less than a first reflux temperature or whether the reflux temperature is greater than a third reflux temperature, if so, executing step S242;

step S242, controlling the heat exchange medium to partially flow into the medium tank (224 a);

step S243, determining whether the reflux temperature is lower than the second reflux temperature or whether the reflux temperature is higher than the fourth reflux temperature, if yes, executing step S244;

step S244, controlling the forced heat exchange mechanism to stop, controlling the heat exchange medium in the medium box (224a) to participate in heat exchange, and controlling the corresponding heat exchange channel to be communicated with the heat exchange device (2);

the second reflux temperature is less than the first reflux temperature, and the fourth reflux temperature is greater than the third reflux temperature.