Energy storage device and energy storage system comprising the same

Abstract

The application discloses an energy storage device, which comprises a cavity for containing energy storage medium, and further comprises a temperature partition plate and a driving device, wherein the temperature partition plate is arranged in the cavity and is used for separating the space in the cavity to form a high-temperature area and a low-temperature area; the driving device is connected with the temperature partition plate and is used for driving the temperature partition plate to move in the cavity, so that the energy storage medium in the high-temperature area flows out, releases heat through a user end and then flows into the low-temperature area, or the energy storage medium in the low-temperature area flows out, releases cold through the user end and then flows into the high-temperature area. The application further discloses an energy storage system comprising the energy storage device. According to the application, both cold storage and heat storage can be realized, the temperature partition plate can move in two directions to supply cold or heat to the user end, the temperature stratification can be eliminated, the water storage temperature can be greater than 100 DEG C, the effective energy storage volume of the energy storage device can be improved, and the energy utilization rate can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an energy storage device and an energy storage system comprising the same. BACKGROUND

[0002] Water energy storage technology stores cold / heat in the form of sensible heat, stores cold / heat in the water energy storage device during the energy storage stage, and releases the stored cold / heat for use at the user end when cold / heat is needed at the user end. Water energy storage technology is often used for industrial waste heat recovery, wind and electricity curtailment, and has important significance for energy saving, reducing power generation capacity, and environmental protection.

[0003] Conventional water cold / heat storage devices use the natural stratification phenomenon of water at different temperatures to store and release energy, and form a temperature gradient layer during the energy storage and release process. The existence of the temperature gradient layer reduces the effective volume of the water energy storage device. The larger the temperature gradient layer, the smaller the effective volume. The size of the temperature gradient layer is greatly affected by the setting of the cold and hot water distributor and the flow rate of cold and hot water. The upper part of the temperature gradient layer is high-temperature water, and the lower part is low-temperature water.

[0004] In order to increase the cold / heat storage capacity and improve the effective volume of the water energy storage device, measures such as increasing the diameter and height of the water energy storage device and optimizing the structure of the water distributor are usually taken. However, due to the influence of water static pressure, the increase in the height of the water energy storage device is limited.

[0005] In conventional water cold / heat storage devices, the temperature stability is greatly affected by the water distributor. The smaller the flow rate of the water distributor interface, the more stable the temperature in the water energy storage device, the smaller the thickness of the temperature gradient layer, and the larger the effective volume of the water energy storage device. However, due to the influence of processing, the flow rate of the water distributor interface cannot be infinitely reduced, and the influence of the water distributor on the temperature in the water energy storage device always exists. SUMMARY

[0006] The technical problem to be solved by the present application is to overcome the defects of the influence of the water distributor of the existing energy storage device on the temperature stability and the limitation of the height of the energy storage device, and to provide an energy storage device and an energy storage system comprising the same.

[0007] The present application solves the above technical problems by the following technical solutions:

[0008] An energy storage device, comprising a cavity for containing an energy storage medium, characterized in that the energy storage device further comprises a temperature partition and a driving device, the temperature partition is arranged in the cavity and is used to divide the space in the cavity to form a high-temperature zone and a low-temperature zone; the driving device is connected with the temperature partition and is used to drive the temperature partition to move in the cavity, so that the energy storage medium in the high-temperature zone flows out and flows into the low-temperature zone, or the energy storage medium in the low-temperature zone flows out and flows into the high-temperature zone.

[0009] In the present scheme, the cavity is divided into high-temperature and low-temperature zones by setting a temperature partition plate in the cavity, and both cold storage and heat storage can be achieved. The temperature partition plate is driven to move in the cavity by a driving device, so as to control the movement of the temperature partition plate according to the cooling or heating demand of the user end, change the volume of the high-temperature and low-temperature zones, and make the corresponding energy storage medium flow out to the user end. Through the piston-type energy storage device in the present scheme, both cold storage and heat storage can be achieved, the temperature partition plate can move in two directions to supply cooling or heating to the user end, and the temperature stratification can be eliminated. The water storage temperature can be greater than 100℃, the effective energy storage volume is increased, and the energy utilization rate is improved.

[0010] In addition, it should be noted that the high temperature and the low temperature are relative temperature concepts. Specifically, the temperature of the energy storage medium in the high-temperature zone is higher than that in the low-temperature zone.

[0011] Preferably, the driving device comprises a rotating screw and a driver, the driver is connected to one end of the rotating screw, the rotating screw is connected to the temperature partition plate, and the driver drives the rotating screw to rotate to drive the temperature partition plate to move.

[0012] In the present scheme, the temperature partition plate is driven to move by the rotating screw and the driver, the high-temperature energy storage medium and the low-temperature energy storage medium are physically isolated, and a piston-type energy storage device is formed, so as to increase the effective volume of energy storage. In addition, the movement of the temperature partition plate is controlled by the rotating screw, and the output of the energy can also be conveniently controlled. In specific implementation, the rotating screw can adopt the driving form of a ball screw, and the temperature partition plate can be connected with the ball, so that the temperature partition plate can move in a straight line direction under the rotation of the rotating screw, without moving with the rotating screw, thereby reducing the wear between the temperature partition plate and the inside of the cavity, and improving the service life and use effect.

[0013] Preferably, the temperature partition plate is longitudinally arranged in the cavity, and the edge of the temperature partition plate is in contact with the side wall of the cavity; the rotating screw is arranged in the cavity and transversely passes through the temperature partition plate and is threadedly connected with the temperature partition plate; and the driver is arranged outside the cavity and connected to one end of the rotating screw.

[0014] Preferably, the energy storage device further comprises a sealing band, which is arranged at the end of the temperature partition plate and in contact with the cavity, for sealing the part between the temperature partition plate and the cavity.

[0015] In the present scheme, the cavity is divided into two independent sealed spaces by arranging a sealing band at the end of the temperature partition plate, so as to avoid convection between the high-temperature zone and the low-temperature zone, and waste of energy.

[0016] Preferably, the energy storage device further comprises a supporting roller arranged at the end of the temperature partition and in contact with the cavity for supporting the temperature partition.

[0017] In the present solution, the supporting roller arranged at the end of the temperature partition supports the temperature partition and avoids direct contact between the temperature partition and the inner wall of the cavity, thereby reducing friction and preventing the sealing belt from being deformed under stress.

[0018] Preferably, the cavity is provided with a hot water interface and a cold water interface, the hot water interface is in communication with the high-temperature zone, and the cold water interface is in communication with the low-temperature zone.

[0019] Preferably, the energy storage device further comprises a high-temperature zone limiting device and a low-temperature zone limiting device, the high-temperature zone limiting device is arranged in the high-temperature zone for limiting the extreme displacement of the temperature partition in the high-temperature zone, and the low-temperature zone limiting device is arranged in the low-temperature zone for limiting the extreme displacement of the temperature partition in the low-temperature zone.

[0020] In the present solution, the limiting devices arranged in the high-temperature zone and the low-temperature zone can limit the extreme position of the temperature partition and prevent the temperature partition from exceeding the extreme stroke.

[0021] Preferably, the energy storage device further comprises a high-temperature water distributor and a low-temperature water distributor, the high-temperature water distributor is arranged in the high-temperature zone of the cavity, and the low-temperature water distributor is arranged in the low-temperature zone of the cavity.

[0022] Preferably, the hot water interface is provided with a first temperature sensor and a first bidirectional flow sensor, and the cold water interface is provided with a second temperature sensor and a second bidirectional flow sensor.

[0023] And / or, the temperature partition is provided with a third temperature sensor on each side for detecting the temperature on both sides of the temperature partition.

[0024] In the present solution, the bidirectional flow sensor can detect the flow rate of liquid flowing out or flowing in at the hot water interface or the cold water interface.

[0025] Preferably, the energy storage device further comprises a controller connected with the first temperature sensor, the second temperature sensor, and the driving device, and the controller is further connected with at least one of the first bidirectional flow sensor and the second bidirectional flow sensor.

[0026] In the scheme, according to the requirement of the user end, the controller acquires corresponding sensor data, calculates and controls the driving device to rotate, so that the temperature partition moves a corresponding distance to change the space size of the high-temperature area and the low-temperature area, and the energy storage medium in the corresponding area flows out to heat or cool the user end.

[0027] Preferably, the controller is further connected with the third temperature sensor, for judging whether the temperature partition is in sealing failure according to the temperature of the hot water interface, the temperature of the cold water interface and the temperature on both sides of the temperature partition.

[0028] In the scheme, the temperature difference on both sides of the temperature partition can be judged by detecting the third temperature sensor, and the temperature partition is judged to be in sealing failure in combination with the temperature at the hot water interface and the cold water interface. In the specific implementation, the third temperature sensor can be a wireless temperature sensor, thereby facilitating the movement of the temperature partition.

[0029] An energy storage system, characterized in that the energy storage system comprises the energy storage device as described above.

[0030] Preferably, the energy storage system further comprises a heat storage branch and a cold storage branch, and the heat storage branch and the cold storage branch are connected in parallel to both ends of the energy storage device.

[0031] In the scheme, the energy storage medium in the high-temperature area or the low-temperature area can be stored through the parallel connection of the heat storage branch and the cold storage branch.

[0032] The positive progress effect of the present application is that: by arranging the temperature partition in the cavity, the cavity is divided into a high-temperature area and a low-temperature area, which can store cold and heat, and the temperature partition is driven to move in the cavity by the driving device, so as to control the movement of the temperature partition according to the cooling or heating requirement of the user end, change the volume of the high-temperature area and the low-temperature area, and make the corresponding energy storage medium flow out to the user end. Through the piston type energy storage device in the scheme, cold and heat can be stored, the temperature partition can move bidirectionally to cool or heat the user end, and the temperature partition can also eliminate the temperature gradient layer, improve the effective energy storage volume of the energy storage device, and improve the energy utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 A structural composition schematic view of an energy storage device provided for an embodiment of the present application;

[0034] Figure 2 A schematic view of a temperature partition in an energy storage device provided for an embodiment of the present application;

[0035] Figure 3 A structural composition schematic view of an energy storage system provided for an embodiment of the present application.

[0036] REFERENCE SIGNS

[0037] 1-Storage tank, 2-Cold water interface, 3-Second bidirectional flow sensor, 4-Second temperature sensor, 5-Low temperature zone, 6-Support roller, 7-Sealing strip, 8-High temperature zone, 9-High temperature water distributor, 10-Hot water interface, 11-First temperature sensor, 12-High temperature vent valve, 13-High temperature safety valve, 14-Wireless hot water temperature sensor, 15-Temperature partition, 16-Wireless cold water temperature sensor, 17-Controller, 18-Rotating screw, 19-Low temperature safety valve, 20-Low temperature vent valve 21-Air valve, 22-Low temperature water distribution pipe, 23-Actuator, 24-High temperature zone limit device, 25-Low temperature zone limit device, 26-First valve, 27-Sixth valve, 28-Third valve, 29-Hot water storage pump, 30-Cooling device, 31-Cold water storage pump, 32-Fifth valve, 33-Fourth valve, 34-Second valve, 35-Ninth valve, 36-Seventh valve, 37-User-end water pump, 38-User-end, 39-Tenth valve, 40-Eighth valve. Detailed Implementation

[0038] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0039] This invention provides an energy storage device, which includes a cavity for containing an energy storage medium. In specific implementation, the energy storage medium can be selected according to requirements. Water is used as the energy storage medium in the following description.

[0040] like Figure 1 As shown, the energy storage device includes an energy storage tank 1, which has a cavity for containing the energy storage medium. The energy storage device also includes a temperature partition 15 and a driving device. The temperature partition 15 is disposed within the cavity to divide the space within the cavity into a high-temperature zone 8 and a low-temperature zone 5. The driving device is connected to the temperature partition 15 and drives the temperature partition 15 to move within the cavity, so that the energy storage medium in the high-temperature zone 8 flows out and releases heat at the user end before flowing into the low-temperature zone 5, or so that the energy storage medium in the low-temperature zone 5 flows out and releases cold at the user end before flowing into the high-temperature zone 8. By setting the temperature partition 15 within the cavity, the cavity is divided into a high-temperature zone 8 and a low-temperature zone 5, allowing for both cold and heat storage. The driving device moves the temperature partition 15 within the cavity to control the movement of the temperature partition 15 according to the cooling or heating demand of the user end 38, changing the volume of the high-temperature zone 8 and the low-temperature zone 5 so that the corresponding energy storage medium flows out to the user end 38. The piston-type energy storage device in this solution can store both cold and heat to provide cooling or heating to the user end 38. It can also increase the effective volume of the energy storage device and improve the energy utilization rate.

[0041] Specifically, the average thermal resistance of the temperature partition 15 is R, which satisfies R > 1[(m2 ·K) / W].

[0042] It should be further noted that the high temperature and the low temperature are relative temperature concepts, and specifically, the temperature of the energy storage medium in the high temperature zone 8 is higher than the temperature of the energy storage medium in the low temperature zone 5, and the specific temperature values are not limited.

[0043] In a specific implementation, the cross section of the energy storage tank 1 can be circular or square. Correspondingly, the temperature partition plate 15 can be circular or square according to the energy storage tank 1.

[0044] As a preferred implementation, as shown in Figure 1 and Figure 2 The energy storage device further comprises a sealing strip 7 arranged at the end of the temperature partition plate 15 and in contact with the cavity, for sealing the part between the temperature partition plate 15 and the cavity.

[0045] In a specific implementation, the sealing strip 7 is arranged circumferentially on the temperature partition plate 15, and the temperature partition plate 15 and the sealing strip 7 together divide the energy storage tank 1 into two independent spaces for containing cold water and hot water, so as to avoid convection between the high temperature zone 8 and the low temperature zone 5.

[0046] As a preferred implementation, as shown in Figure 1 The energy storage device further comprises a support roller 6 arranged at the end of the temperature partition plate 15 and in contact with the cavity, for supporting the temperature partition plate 15.

[0047] In a specific implementation, the support roller 6 is arranged at the periphery of the temperature partition plate 15, and a plurality of support rollers 6 are arranged at intervals. By arranging the support roller 6 at the end of the temperature partition plate 15, on the one hand, the temperature partition plate 15 is supported, and on the other hand, direct contact between the temperature partition plate 15 and the inner wall of the cavity is avoided, friction is reduced, and deformation of the sealing strip 7 under stress is avoided. In addition, the sealing strip 7 can be arranged on both sides of the support roller 6.

[0048] As a preferred implementation, as shown in Figure 1 The driving device comprises a rotating screw 18 and a driver 22, the driver 22 is connected to one end of the rotating screw 18, the rotating screw 18 is connected to the temperature partition plate 15, and the driver 22 drives the rotating screw 18 to rotate to drive the temperature partition plate 15, the sealing strip 7, and the support roller 6 to move, forming a piston type energy storage device, thereby increasing the effective volume of the energy storage device. In addition, by controlling the movement of the temperature partition plate 15 through the rotating screw 18, the output of the energy source can also be easily controlled.

[0049] As a specific embodiment, the rotating screw 18 can adopt the driving form of a ball screw, and the temperature partition plate 15 can be connected with the ball, so that under the rotation of the rotating screw 18, the temperature partition plate 15 can move in a straight line without moving with the rotating screw 18, reducing the wear between the temperature partition plate 15 and the inside of the cavity, and improving the service life and use effect.

[0050] As a specific embodiment, as shown in Figure 1 , the temperature partition plate 15 is longitudinally arranged in the cavity, and the temperature partition plate 15 is in contact with the inner wall of the cavity through the sealing band 7; the rotating screw 18 is arranged in the cavity and transversely passes through the temperature partition plate 15 and is threadedly connected with the temperature partition plate 15; the driver 22 is arranged outside the cavity and connected with one end of the rotating screw 18.

[0051] In specific implementation, as shown in Figure 1 , the driver 22 can be arranged on one side of the low-temperature area 5.

[0052] Through the above-mentioned embodiment, the volume utilization rate of the energy storage device can be calculated by the number of rotations of the driving device. The specific calculation formula is:

[0053]

[0054] Among them, V η is the volume utilization rate, K is the conversion coefficient of the driver 22 rotating one circle to the moving distance of the temperature partition plate 15, m; A is the cross-sectional area of the energy storage device, m 2 ; n is the number of rotations of the driving device in one period; V is the volume of the energy storage device, m 3 .

[0055] As a specific embodiment, as shown in Figure 1 , the cavity is provided with a hot water interface 10 and a cold water interface 2, the hot water interface 10 is communicated with the high-temperature area 8, and the cold water interface 2 is communicated with the low-temperature area 5.

[0056] In specific implementation, the hot water interface 10 can be located at the upper part of one side of the energy storage device, and the cold water interface 2 can be located at the lower part of the other side of the energy storage device.

[0057] As a specific embodiment, as shown in Figure 1 , the energy storage device further comprises a high-temperature area limiting device 23 and a low-temperature area limiting device 24, the high-temperature area limiting device 23 is arranged in the high-temperature area 8 and is used for limiting the limit displacement of the temperature partition plate 15 in the high-temperature area 8; the low-temperature area limiting device 24 is arranged in the low-temperature area 5 and is used for limiting the limit displacement of the temperature partition plate 15 in the low-temperature area 5.

[0058] In practical implementation, the rotating screw 18 can drive the temperature baffle 15, the support roller 6 and the sealing strip 7 to move freely in both directions. By setting limit devices in the high temperature zone 8 and the low temperature zone 5, the extreme positions of the temperature baffle 15, the support roller 6 and the sealing strip 7 can be limited, and the temperature baffle 15 can be prevented from exceeding its limit stroke.

[0059] As one specific implementation method, such as Figure 1 As shown, the energy storage device also includes a high-temperature water distributor 9 and a low-temperature water distributor 21. The high-temperature water distributor 9 is located in the high-temperature zone 8 of the cavity, and the low-temperature water distributor 21 is located in the low-temperature zone 5 of the cavity.

[0060] In specific implementation, such as Figure 1 As shown, the water distribution pipe of the high-temperature water distributor 9 can be longitudinally installed in the high-temperature zone 8, and the water distribution pipe of the low-temperature water distributor 21 can be longitudinally installed in the low-temperature zone 5.

[0061] As a preferred implementation method, such as Figure 1 As shown, the energy storage device also includes a venting valve. The venting valve is located on both sides of the upper part of the energy storage tank 1, outside the travel of the temperature partition 15. The high temperature zone 8 is provided with a high temperature venting valve 12, and the low temperature zone 5 is provided with a low temperature venting valve 20.

[0062] As a preferred implementation method, such as Figure 1 As shown, the energy storage device also includes safety valves, which are located on both sides of the upper part of the housing, outside the travel of the temperature partition 15. The high temperature zone 8 is equipped with a high temperature safety valve 13, and the low temperature zone 5 is equipped with a low temperature safety valve 19.

[0063] As a preferred implementation method, such as Figure 1 As shown, the hot water inlet 10 is equipped with a first temperature sensor 11 and a first bidirectional flow sensor (not shown in the figure), and the cold water inlet 2 is equipped with a second temperature sensor 4 and a second bidirectional flow sensor 3. The first temperature sensor 11 can detect the water temperature at the hot water inlet 10, and the second temperature sensor 4 can detect the water temperature at the cold water inlet 2. Furthermore, the first bidirectional flow sensor can detect the water flow rate through the hot water inlet 10, and the second bidirectional flow sensor 3 can detect the water flow rate through the cold water inlet 2.

[0064] Based on the above test data, the instantaneous output of cooling or heating energy from the energy storage device can be calculated using the temperature values ​​of cold water interface 2, hot water interface 10, and flow rate. The specific calculation formula is as follows:

[0065] P = 1.16·(t) r -t l )·G

[0066] Where P represents the instantaneous output of cooling and heating energy from the energy storage device, in kW; tr The temperature of the hot water interface is 10°C; t l G represents the temperature of cold water interface 2, in °C; G represents the flow rate of cold water interface 2, in kg / h.

[0067] The effective energy storage capacity of the energy storage device can also be calculated. The specific calculation formula is as follows:

[0068] Q=ρ·K·A·n·(t r -t l )·C

[0069] Where Q is the effective energy storage capacity, kJ; and ρ is the density of the energy storage medium, kg / m³. 3 K is the conversion coefficient (m) for one revolution of the actuator 22 to the moving distance of the temperature baffle 15; A is the cross-sectional area of ​​the energy storage device (m²). 2 n is the number of revolutions of the drive unit in one cycle; t r The temperature of the hot water interface is 10°C; t l t is the temperature of the cold water interface 2, in °C; C is the specific heat capacity of the energy storage medium, in kJ / (kg·°C).

[0070] As a preferred implementation method, such as Figure 1 As shown, a third temperature sensor is provided on each side of the temperature partition 15. The third temperature sensor is used to detect the temperature on both sides of the temperature partition 15.

[0071] In practical implementation, the third temperature sensor can be a wireless temperature sensor, thereby facilitating the movement of the temperature partition 15. Specifically, multiple wireless hot water temperature sensors 14 are provided on the side wall of the temperature partition 15 located in the high-temperature zone 8, and multiple wireless cold water temperature sensors 16 are provided on the side wall of the temperature partition 15 located in the low-temperature zone 5; and there can be multiple third temperature sensors, which are evenly arranged longitudinally on both sides of the temperature partition 15, so that the temperature can be obtained based on the detection results of multiple third temperature sensors, which is more consistent with the actual situation on both sides of the temperature partition 15.

[0072] Based on the above test data, the failure of the sealing strip 7 can be determined by the temperature values ​​of the cold water interface 2, the hot water interface 10, the temperature of the high-temperature side of the temperature baffle 15, and the temperature of the low-temperature zone 5 of the temperature baffle 15. Details are as follows:

[0073] (t r -t l )-(t gr -t gl )>Δt

[0074] Among them, t r The temperature of the hot water interface is 10°C; t l Temperature of cold water inlet 2, in °C; t grt is the temperature of the hot water area of the temperature partition 15, ℃; Δt is the temperature difference of the temperature partition 15, ℃; Δt is the failure temperature difference. If the failure temperature difference Δt is met, it is determined that the sealing band 7 fails. gl t is the temperature of the hot water area of the temperature partition 15, ℃; Δt is the temperature difference of the temperature partition 15, ℃; Δt is the failure temperature difference. If the failure temperature difference Δt is met, it is determined that the sealing band 7 fails.

[0075] As a preferred embodiment, as shown in the drawings, the energy storage device further comprises a controller 17, the controller 17 is connected with the first temperature sensor 11, the second temperature sensor 4 and the driving device, and the controller 17 is further connected with at least one of the first bidirectional flow sensor and the second bidirectional flow sensor 3. Figure 1

[0076] In specific implementation, according to the needs of the user end 38, the controller 17 obtains corresponding sensor data, calculates and controls the driving device to rotate, so as to make the temperature partition 15 move a corresponding distance to change the space size of the high-temperature area 8 and the low-temperature area 5, so that the energy storage medium in the corresponding area flows out to supply heat or cold to the user end 38. Thus, the use effect of the user end 38 is improved. For example, the controller 17 can control the rotating speed of the rotating screw 18 according to the flow data of the cold water interface 2 and the flow data of the hot water interface 10, so as to control the moving speed of the temperature partition 15, the sealing band 7 and the supporting roller 6. In addition, when the driving device rotates, the rotating speed and the rotating amount of the rotating screw 18 can be controlled.

[0077] As a preferred embodiment, as shown in the drawings, the energy storage device further comprises a controller 17, the controller 17 is connected with the first temperature sensor 11, the second temperature sensor 4 and the driving device, and the controller 17 is further connected with at least one of the first bidirectional flow sensor and the second bidirectional flow sensor 3. Figure 3

[0078] The embodiment of the present application further provides an energy storage system, as shown in the drawings, the energy storage system comprises the energy storage device as described above. Figure 3

[0079] As a preferred embodiment, as shown in the drawings, the energy storage device further comprises a controller 17, the controller 17 is connected with the first temperature sensor 11, the second temperature sensor 4 and the driving device, and the controller 17 is further connected with at least one of the first bidirectional flow sensor and the second bidirectional flow sensor 3. Figure 3

[0080] As a preferred embodiment, as shown in the drawings, the energy storage device further comprises a controller 17, the controller 17 is connected with the first temperature sensor 11, the second temperature sensor 4 and the driving device, and the controller 17 is further connected with at least one of the first bidirectional flow sensor and the second bidirectional flow sensor 3. Figure 3

[0081] ​​​​​As a specific embodiment, as shown in Figure 3 The heat storage branch includes a heat storage water pump 28 and a heating device 30. The heat storage water pump 28 is connected to the low-temperature area 5 and can pump the outflowing energy storage medium in the low-temperature area 5 into the heating device 30 to store heat. The heat storage branch further includes a third valve 27 and a fourth valve 33. The third valve 27 is arranged at the water inlet of the heat storage water pump 28, and the fourth valve 33 is arranged at the water outlet of the heating device 30.

[0082] As a specific embodiment, as shown in Figure 3 The cold storage branch includes a cold storage water pump 31 and a cold supply device 29. The cold storage water pump 31 is connected to the high-temperature area 8 and can pump the outflowing energy storage medium in the high-temperature area 8 into the cold supply device 29 to store cold. The heat storage branch further includes a fifth valve 32 and a sixth valve 26. The fifth valve 32 is arranged at the water inlet of the cold storage water pump 31, and the sixth valve 26 is arranged at the water outlet of the cold supply device 29.

[0083] As a specific embodiment, as shown in Figure 3 The energy storage system further includes a user end 38 branch. The user end 38 branch includes a user end water pump 37 and the user end 38. The user end 38 branch further includes valves for controlling the high-temperature water or the low-temperature water to enter the user end water pump 37 and then enter the user end 38. Specifically, as shown in ​ The user end 38 branch includes a seventh valve 36 and an eighth valve 40 for controlling the high-temperature water to enter the user end 38, and a tenth valve 39 and a ninth valve 35 for controlling the low-temperature water to enter the user end 38.

[0084] The following describes some working processes of the energy storage system in the embodiment of the present application, including a heat storage phase, a heat release phase, a cold storage phase and a cold release phase, taking the above-described energy storage system as an example.

[0085] In the heat storage phase, the first valve 25, the third valve 27, the fourth valve 33 and the second valve 34 are opened, and the remaining valves are closed. The energy storage device contains cold water. The temperature partition plate 15 is located at the limit position of the hot water area. The cold water enters the heating device 30 through the heat storage water pump 28 via the cold water interface 2. The cold water is heated to become hot water and enters the energy storage tank 1 via the hot water interface 10. At the same time, the controller 17 receives the signal of the second bidirectional flow sensor 3 (cold water flow meter) and controls the driving device 22 (driving motor) to drive the rotating screw 18 to rotate. The rotating screw 18 drives the temperature partition plate 15, the sealing belt 7 and the supporting roller 6 to move to the cold water interface 2 side until the temperature partition plate 15 contacts the low-temperature area limiting device 24. The heat storage phase ends.

[0086] In the heat release phase, the seventh valve 36 and the eighth valve 40 are opened, the rest of the valves are closed, the energy storage device is hot water, the temperature partition 15 is located at the low temperature zone 5 limit position, the hot water enters the user end 38 through the hot water interface 10 and the user end water pump 37, the hot water becomes cold water after heat release at the user end 38, and then enters the energy storage tank 1 through the cold water interface 2. At the same time, the controller 17 receives the signal of the second bidirectional flow sensor 3 (cold water flow meter), controls the drive motor 22 (drive motor) to drive the rotating screw rod 18 to rotate, and the rotating screw rod 18 drives the temperature partition 15, the sealing belt 7 and the supporting roller 6 to move to the hot water interface 10 side until the temperature partition 15 contacts the high temperature zone limiting device 23, and the heat release phase ends.

[0087] In the cold storage phase, the second valve 34, the fifth valve 32, the sixth valve 26 and the first valve 25 are opened, the rest of the valves are closed, the energy storage device is hot water, the temperature partition 15 is located at the low temperature zone 5 limit position, the hot water enters the cold supply device 29 through the hot water interface 10 and the cold storage water pump 31, and then becomes cold water after being cooled, and then enters the energy storage tank 1 through the cold water interface 2. At the same time, the controller 17 receives the signal of the second bidirectional flow sensor 3 (cold water flow meter), controls the drive motor 22 (drive motor) to drive the rotating screw rod 18 to rotate, and the rotating screw rod 18 drives the temperature partition 15, the sealing belt 7 and the supporting roller 6 to move to the hot water interface 10 side until the temperature partition 15 contacts the high temperature zone limiting device 23, and the cold storage phase ends.

[0088] In the cold release phase, the tenth valve 39 and the ninth valve 35 are opened, the rest of the valves are closed, the energy storage device is cold water, the temperature partition 15 is located at the hot water zone limit position, the cold water enters the user end 38 through the cold water interface 2 and the user end water pump 37, the cold water becomes hot water after heat release at the user end 38, and then enters the energy storage tank 1 through the hot water interface 10. At the same time, the controller 17 receives the signal of the second bidirectional flow sensor 3 (cold water flow meter), controls the drive motor 22 (drive motor) to drive the rotating screw rod 18 to rotate, and the rotating screw rod 18 drives the temperature partition 15, the sealing belt 7 and the supporting roller 6 to move to the cold water interface 2 side until the temperature partition 15 contacts the low temperature zone limiting device 24, and the cold release phase ends.

[0089] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.

Claims

1. An energy storage device comprising a cavity for containing an energy storage medium, characterized in that, The energy storage device further comprises a temperature partition plate arranged in the cavity for partitioning the space in the cavity to form a high-temperature zone and a low-temperature zone; and a driving device connected with the temperature partition plate for driving the temperature partition plate to move in the cavity so that the energy storage medium in the high-temperature zone flows out and flows into the low-temperature zone, or the energy storage medium in the low-temperature zone flows out and flows into the high-temperature zone. The cavity is provided with a hot water interface and a cold water interface, the hot water interface is in communication with the high-temperature zone, and the cold water interface is in communication with the low-temperature zone; the hot water interface is provided with a first temperature sensor for detecting the temperature of water at the hot water interface, the cold water interface is provided with a second temperature sensor for detecting the temperature of water at the cold water interface; the two sides of the temperature partition plate are respectively provided with a third temperature sensor for detecting the temperature of the two sides of the temperature partition plate, and the third temperature sensor is a wireless temperature sensor; The energy storage device further comprises a controller connected with the first temperature sensor and the second temperature sensor; the controller is further connected with the third temperature sensor for judging whether the temperature partition plate is sealed invalid according to the temperature of the hot water interface, the temperature of the cold water interface and the temperature of the two sides of the temperature partition plate; when the following conditions are met, it is determined that the sealing is invalid: (t r -t l )-(t gr -t gl )>Δt where t r is the hot water interface temperature, t l is the cold water interface temperature, t gr is the temperature barrier hot water zone temperature, t gl is the temperature barrier cold water zone temperature, and Δt is the failure temperature differential. The energy storage device further comprises a sealing strip arranged at the end of the temperature partition plate and in contact with the cavity for sealing the part between the temperature partition plate and the cavity; The energy storage device further comprises a supporting roller arranged at the end of the temperature partition plate and in contact with the cavity for supporting the temperature partition plate; The sealing strip is arranged in the circumferential direction of the temperature partition plate, the supporting roller is arranged at the periphery of the temperature partition plate, and a plurality of supporting rollers are arranged at intervals, and the sealing strip is arranged on both sides of the supporting roller.

2. The energy storage device of claim 1, wherein, The driving device comprises a rotating screw and a driver, the driver is connected with one end of the rotating screw, the rotating screw is connected with the temperature partition plate, and the driver drives the rotating screw to rotate to drive the temperature partition plate to move.

3. The energy storage device of claim 2, wherein, The temperature partition plate is longitudinally arranged in the cavity, and the edge of the temperature partition plate is in contact with the side wall of the cavity; the rotating screw is arranged in the cavity and transversely passes through the temperature partition plate and is threadedly connected with the temperature partition plate; and the driver is arranged outside the cavity and connected with one end of the rotating screw.

4. The energy storage device of claim 1, wherein, The energy storage device further comprises a high-temperature zone limiting device arranged in the high-temperature zone for limiting the limit displacement of the temperature partition plate in the high-temperature zone; and a low-temperature zone limiting device arranged in the low-temperature zone for limiting the limit displacement of the temperature partition plate in the low-temperature zone. The energy storage device further comprises a high-temperature water distributor arranged in the high-temperature zone of the cavity and a low-temperature water distributor arranged in the low-temperature zone of the cavity.

5. The energy storage device of claim 4, wherein, The hot water interface is provided with a first bidirectional flow sensor, and the cold water interface is provided with a second bidirectional flow sensor.

6. The energy storage device of claim 5, wherein, The controller is connected with the driving device, and the controller is further connected with at least one of the first bidirectional flow sensor and the second bidirectional flow sensor.

7. An energy storage system characterized by, The energy storage system comprises the energy storage device according to any one of claims 1-6.

8. The energy storage system of claim 7, wherein, The energy storage system further comprises a heat storage branch and a cold storage branch, and the heat storage branch and the cold storage branch are connected in parallel to two ends of the energy storage device.

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