Energy storage device and control method thereof

Abstract

The application relates to an energy storage device and a control method thereof. The energy storage device is provided with an energy storage module in an energy storage bin; a cooling module is connected with the energy storage bin and used for cooling; a first temperature rising module is connected with the energy storage bin and used for temperature rising; a first power generation module is connected with the cooling module and the first temperature rising module; a second power generation module is connected with the energy storage module and connected with the cooling module and the first temperature rising module; the energy storage module is connected with the cooling module and the first temperature rising module; a temperature detection module is used for detecting temperature information in the energy storage bin; and a control module selectively controls the first power generation module, the second power generation module or the energy storage module to supply power to the cooling module and the first temperature rising module according to the temperature information detected by the temperature detection module. The energy storage device can supply power to the cooling module, the first temperature rising module and the like under any temperature environment, and the cooling module, the first temperature rising module and the like can cool or raise the temperature in the energy storage bin to a normal working temperature range.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and more particularly to an energy storage device and its control method. Background Technology

[0002] Energy storage devices typically consist of multiple battery clusters connected together. They can receive and store electrical energy generated by photovoltaic power generation devices, etc., and this stored electrical energy can supply power to external devices when needed.

[0003] Batteries' charge and discharge performance is affected by temperature. Within the normal operating temperature range, batteries exhibit good charge and discharge performance. However, at lower or higher temperatures, deviating from the normal operating temperature range, the battery's charge and discharge performance will significantly decrease. Therefore, for energy storage devices, the normal operation of energy storage devices will also be affected in low-temperature or high-temperature environments, with their charge and discharge efficiency correspondingly decreasing, or even failing to charge and discharge. This limits the effectiveness and application scenarios of energy storage devices. Summary of the Invention

[0004] This invention provides an energy storage device and its control method to solve the technical problem in the prior art that energy storage devices cannot work properly or have low working efficiency in extreme temperature environments.

[0005] The energy storage device provided by this invention includes an energy storage chamber, a first power generation module, a second power generation module, a cooling module, a first heating module, a temperature detection module, and a control module. The energy storage chamber contains the energy storage module. The cooling module is connected to the energy storage chamber and is used to cool the energy storage chamber. The first heating module is connected to the energy storage chamber and is used to heat the energy storage chamber. The first power generation module is used for emergency power generation and is connected to the cooling module and the first heating module. The second power generation module is connected to the energy storage module and also to the cooling module and the first heating module. The energy storage module is connected to the cooling module and the first heating module. The temperature detection module is used to detect the temperature information inside the energy storage chamber. The control module, based on the temperature information detected by the temperature detection module, selectively controls the first power generation module, the second power generation module, or the energy storage module to supply power to the cooling module and the first heating module.

[0006] The first heating module has a heating medium, which is molten salt.

[0007] The first heating module includes a first pipe, a heat exchanger, and a second pipe. A first molten salt tank, a second molten salt tank, and a drive pump are respectively installed on the first pipe. The first pipe is connected to the heat exchanger, and the connection between the two is located between the first molten salt tank and the second molten salt tank. The drive pump drives the molten salt in the first pipe to flow along the direction of the first molten salt tank, the heat exchanger, and the second molten salt tank. The second pipe is connected to the heat exchanger and the energy storage chamber.

[0008] The second molten salt tank is connected to the first molten salt tank so that the molten salt flowing out of the second molten salt tank can flow back into the first molten salt tank; a first heater is provided between the second molten salt tank and the first molten salt tank, and the first heater is used to heat the molten salt flowing back into the first molten salt tank.

[0009] The first pipe is provided with an air inlet, and a second heater is provided at the air inlet. The second heater is used to heat the gas entering the first pipe from the air inlet.

[0010] The first heating module further includes a vacuum pump, which is used to generate negative pressure in the first pipe to accelerate the flow of molten salt in the first pipe.

[0011] The first power generation module includes a generator, and the second power generation module includes a photovoltaic power generation device and / or a wind power generation device.

[0012] The generator includes a steam turbine generator set.

[0013] The steam turbine generator set includes a steam generator, which includes a water container, a molten salt tank, and a steam pipe. The water container contains water. The molten salt tank contains molten salt and is connected to the water container. The molten salt is used to heat the water in the water container to generate steam. The steam pipe is connected to the water container to output steam.

[0014] The steam turbine generator set has a steam output terminal; the energy storage device includes a second heating module, which is connected to the steam output terminal and heats the energy storage chamber according to the steam output from the steam output terminal; the second heating module is opened and closed according to the control of the control module.

[0015] The control method for an energy storage device provided by the present invention includes:

[0016] Monitor the temperature information inside the energy storage compartment;

[0017] When the temperature inside the energy storage chamber is higher than the normal operating temperature range, the second power generation module is controlled to supply power to the cooling module, or the first power generation module is activated to supply power to the cooling module, and the cooling module cools the energy storage chamber.

[0018] When the temperature inside the energy storage chamber is lower than the normal operating temperature range, the first power generation module is activated and supplies power to the first heating module, which then heats the energy storage chamber.

[0019] The control method for the energy storage device further includes:

[0020] During the cooling process of the energy storage chamber by the cooling module, the temperature information inside the energy storage chamber is monitored;

[0021] When the temperature inside the energy storage chamber is within the normal operating temperature range, determine whether the cooling system built into the energy storage chamber can maintain the temperature inside the energy storage chamber within the normal operating temperature range.

[0022] If yes, the cooling module is shut down; otherwise, the cooling module is powered by the second power generation module.

[0023] When the temperature inside the energy storage chamber is lower than the normal operating temperature range, the second heating module is activated, and the second heating module and the first heating module work together to heat up the energy storage chamber.

[0024] The control method for the energy storage device further includes:

[0025] During the process of heating the energy storage chamber by the first heating module, the temperature information inside the energy storage chamber is detected;

[0026] When the temperature inside the energy storage chamber is within the normal operating temperature range, the system detects whether the heat generated by the energy storage module itself maintains the temperature inside the energy storage chamber within the normal operating temperature range.

[0027] If yes, then the heating of the energy storage compartment will stop; if not, then the second power generation module will supply power to the first heating module.

[0028] When the temperature inside the energy storage chamber is lower than the normal operating temperature range and less than a first set value, the vacuum pump is activated to improve the heating efficiency of the first heating module.

[0029] The control method for the energy storage device further includes:

[0030] During the process of heating the energy storage chamber by the first heating module, the temperature information inside the energy storage chamber is detected;

[0031] When the temperature inside the energy storage chamber is within the normal operating temperature range, the second power generation module supplies power to the first heating module.

[0032] The energy storage device and its control method provided by the present invention have the following advantages compared with the prior art:

[0033] The energy storage device and its control method provided by this invention detect the temperature information inside the energy storage chamber through a temperature detection module. Based on the detected temperature information, the environment of the energy storage chamber and the working status of the energy storage module can be clearly determined. On this basis, according to the needs of the energy storage module, the control module can control the cooling module, the first heating module, etc., to cool or heat the energy storage chamber. Furthermore, the energy storage device includes a first power generation device, a second power generation device, and energy storage modules, ensuring that the power demand of the cooling module, the first heating module, etc., is met under any temperature environment. That is, under any temperature environment, the temperature inside the energy storage chamber can be cooled or heated to the normal operating temperature range, allowing the energy storage module inside the chamber to resume normal charging and discharging. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the energy storage device in an embodiment of the present invention;

[0037] Figure 2 This is a flowchart of the control method for the energy storage device in an embodiment of the present invention.

[0038] In the picture:

[0039] 10 - Energy storage compartment; 20 - First power generation module; 30 - Second power generation module; 40 - Cooling module; 50 - First heating module; 60 - Temperature detection module; 70 - Control module; 80 - Second heating module;

[0040] 11-Energy storage module; 21-Generator; 211-Water container; 212-Molten salt tank; 213-Steam pipe; 214-Steam turbine;

[0041] 51-First pipe; 52-Heat exchanger; 53-Second pipe; 54-First molten salt tank; 55-Second molten salt tank; 56-Drive pump; 57-First heater; 58-Second heater; 59-Vacuum pump. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The embodiments of the energy storage device and its control method provided by the present invention will be described below with reference to the accompanying drawings.

[0044] In one embodiment of the energy storage device of the present invention, see Figure 1 The energy storage device includes an energy storage chamber 10, a first power generation module 20, a second power generation module 30, a cooling module 40, a first heating module 50, a temperature detection module 60, and a control module 70.

[0045] An energy storage module 11 is installed inside the energy storage compartment 10. Specifically, the energy storage module 11 can be a battery, which stores electrical energy and releases it when needed. When the energy storage module 11 is a battery, it can include multiple battery cells, which can be connected and combined into multiple unit cells. Each unit cell can include one or more battery cells, and each battery unit cell can specifically take the form of a battery module or a battery pack.

[0046] The cooling module 40 is connected to the energy storage chamber 10 and is used to cool the energy storage chamber 10. The cooling module 40 can be an air conditioner, etc. The first heating module 50 is connected to the energy storage chamber 10 and is used to heat the energy storage chamber 10. The first heating module 50 can have a heating medium, and the energy storage chamber 10 is heated through heat exchange with the heating medium. The heating medium can be molten salt.

[0047] The first power generation module 20 is used for emergency power generation. It is connected to the cooling module 40 and the first heating module 50. The first power generation module 20 is used for emergency power generation, meaning that when the energy storage chamber 10 is operating normally, the first power generation module 20 does not start and does not generate electricity. When the energy storage chamber 10 cannot operate normally and requires electrical energy, but the second power generation module 30 cannot generate electricity or the generated electricity cannot be effectively supplied to the energy storage module 11 for output, the first power generation module 20 is started and generates electricity. The generated electricity can be supplied to the cooling module 40, the first heating module 50, or other electrical loads. Specifically, the first power generation module 20 may include a generator 21, which may be, for example, a steam turbine generator set or a gas turbine generator set.

[0048] The second power generation module 30 is connected to the energy storage module 11, and also to the cooling module 40 and the first heating module 50. The second power generation module 30 is the main power generation component in the energy storage device. Under normal operating conditions of the energy storage chamber 10, the second power generation module 30 generates electrical energy, which can be stored in the energy storage module 11, or output to the cooling module 40, the first heating module 50, and other components, as well as to electrical loads. Specifically, the second power generation module 30 may include a photovoltaic power generation device 31 and / or a wind power generation device. In actual implementation, the second power generation module 30 can be implemented in three ways: first, the second power generation module 30 includes a photovoltaic power generation device 31; second, the second power generation module 30 includes a wind power generation device; and third, the second power generation module 30 includes both a photovoltaic power generation device 31 and a wind power generation device.

[0049] In this embodiment, the energy storage module 11 can also be connected to the cooling module 40 and the first heating module 50 to provide the electrical energy stored in the energy storage module 11 to the cooling module 40 and the first heating module 50.

[0050] The temperature detection module 60 is used to detect the temperature information inside the energy storage compartment 10. The temperature detection module 60 can be a temperature sensor of various forms and principles. The temperature detection module 60 is installed inside the energy storage compartment 10, and its specific location can be set as needed, for example, it can be installed inside the energy storage compartment 10 adjacent to the energy storage module 11. The temperature detection module 60 detects the temperature information inside the energy storage compartment 10. Based on the detected temperature information, it can determine the ambient temperature of the energy storage device, the operating status and performance of the energy storage module 11 at that ambient temperature, and whether the energy storage compartment 10 needs to be cooled or heated. For example, generally, battery-type energy storage modules 11 can operate normally within the range of 0 to 40°C, while their charging and discharging performance decreases or they may not be able to charge or discharge at temperatures above or below this range. If the detected temperature is 45°C, which is higher than the aforementioned temperature range, then the energy storage compartment 10 needs to be cooled; if the detected temperature is -30°C, which is lower than the aforementioned temperature range, then the energy storage compartment 10 needs to be heated.

[0051] Based on the temperature information detected by the temperature detection module 60, the control module 70 selectively controls the first power generation module 20, the second power generation module 30, or the energy storage module 11 to supply power to the cooling module 40 and the first heating module 50. Specifically, based on the temperature information detected by the temperature detection module 60, after determining that the energy storage chamber 10 needs to be cooled or heated, the control module 70 can select any one of the first power generation module 20, the second power generation module 30, and the energy storage module 11 to supply power to the cooling module 40 and the first heating module 50 as needed. This better meets and ensures the power demand of the cooling module 40 and the first heating module 50, allowing the interior of the energy storage chamber 10 to maintain a normal temperature range in low or high temperature environments, thus enabling the energy storage module 11 to operate better in low or high temperature environments.

[0052] For example, in a low-temperature environment, when the energy storage module 11 cannot charge or discharge, the electricity generated by the second power generation module 30 cannot be output to the cooling module 40, the first heating module 50, etc. through the energy storage module 11. At this time, the control module 70 can control the first charging module 20 to supply power to the first heating module 50, and then the first heating module 50 can generate heat to heat up the energy storage chamber 10, so that the energy storage chamber 10 is within the normal temperature range, thereby enabling the energy storage module 11 to work normally in a low-temperature environment. During the process of heating up the energy storage chamber 10, if the energy storage module 11 is already working normally, the first power generation module 20 can be turned off, and the second power generation module 30 can be switched to supply power to the first heating module 50. If the second power generation module 30 includes a photovoltaic power generation device or a wind power generation device, maintaining the power supply to the first heating module 50 will not consume fossil fuels, which can reduce costs and pollution.

[0053] In one specific embodiment of the energy storage device, the first heating module 50 includes a first pipe 51, a heat exchanger 52, and a second pipe 53. A first molten salt tank 54, a second molten salt tank 55, and a drive pump 56 are respectively installed on the first pipe 51. The first pipe 51 is connected to the heat exchanger 52, and the connection point between the two is located between the first molten salt tank 54 and the second molten salt tank 55. The drive pump 56 can be one or more, and the drive pump 56 drives the molten salt in the first pipe 51 to flow along the direction of the first molten salt tank 54, the heat exchanger 52, and the second molten salt tank 55. The second pipe 53 is connected to both the heat exchanger 52 and the energy storage chamber 10.

[0054] In this embodiment, the molten salt in the first molten salt tank 54 is high-temperature molten salt, and the molten salt in the second molten salt tank 55 is low-temperature molten salt. The terms "high-temperature molten salt" and "low-temperature molten salt" are relative and do not refer to molten salt with a specific higher temperature or a specific lower temperature.

[0055] Under the action of the drive pump 56, the high-temperature molten salt in the first molten salt tank 54 flows towards the heat exchanger 52, where it exchanges heat with the medium (such as ethylene glycol) in the second pipe 53. After heat exchange, on the one hand, the temperature of the medium in the second pipe 53 increases, and its heat content increases; on the other hand, the heat of the molten salt in the first pipe 51 decreases, transforming into low-temperature molten salt, which continues to flow to the second molten salt tank 55 under the action of the drive pump 56. The increased heat of the medium in the second pipe 53 can be released when the medium in the second pipe 53 flows to the energy storage chamber 10, thereby increasing the temperature of the energy storage chamber 10; after releasing heat, the temperature of the medium in the second pipe 53 decreases, and it can then continue to flow to the heat exchanger 52 to absorb heat, thus continuously increasing the temperature of the energy storage chamber 10.

[0056] Specifically, in this embodiment, a flow meter and a flow valve may be installed on the first pipe 51. The flow meter can obtain the flow rate information of the molten salt in the first pipe 51, thereby obtaining accurate or approximate information about the heat value exchanged at the heat exchanger 52; the flow valve can adjust the flow rate of the molten salt in the first pipe 51 to increase or decrease the heat value exchanged at the heat exchanger 52.

[0057] In this embodiment, the second molten salt vessel 55 can be connected to the first molten salt vessel 54 so that the molten salt flowing out of the second molten salt vessel 55 can flow back into the first molten salt vessel 54. Furthermore, a first heater 57 is provided between the second molten salt vessel 55 and the first molten salt vessel 54, and the first heater 57 is used to heat the molten salt flowing back into the first molten salt vessel 54.

[0058] In this embodiment, by connecting the second molten salt tank 55 and the first molten salt tank 54, the low-temperature molten salt in the second molten salt tank 55 can flow back into the first molten salt tank 54, thus enabling the recycling of molten salt and reducing its consumption. Simultaneously, a first heater 57 is installed between the two tanks to heat the molten salt, converting the low-temperature molten salt flowing out of the second molten salt tank 54 into high-temperature molten salt.

[0059] In this embodiment, an air inlet can be provided on the first pipe 51, and a second heater 58 is provided at the air inlet. The second heater 58 is used to heat the gas entering the first pipe 51 from the air inlet. The drive pump 56 drives the molten salt to move in the first pipe 51. One way to achieve this is to fill or extract gas into the first pipe 51, and the gas acts on the molten salt to drive the molten salt to move. In this implementation, air needs to be introduced into the first pipe 51 from the outside, and the aforementioned air inlet is used to realize the introduction of air into the first pipe 51. In this embodiment, the air heater provided at the air inlet can make the air entering the first pipe 51 hot air. When the air entering the first pipe 51 is hot air, the temperature of the molten salt in the first pipe 51 can be avoided, and even heat can be added to the molten salt in the first pipe 51, thereby improving the heat exchange efficiency at the heat exchanger 52, and thus obtaining a higher heating efficiency for the energy storage chamber 10.

[0060] In this embodiment, the first heating module 50 may further include a vacuum pump 59, which generates a negative pressure within the first pipe 51 to accelerate the flow of molten salt within the first pipe 51. By accelerating the flow of molten salt within the first pipe 51 through the vacuum pump 59, the amount of heat exchanged at the heat exchanger 52 per unit time can be higher, thereby allowing the energy storage chamber 10 to obtain more heat and achieve a higher heating efficiency for the energy storage chamber 10.

[0061] In this embodiment, as described above, the generator 21 may specifically include a steam turbine generator set, a gas turbine generator set, or a diesel generator, or various other power generation devices.

[0062] In a preferred embodiment, the generator 21 includes a steam turbine generator set. The steam turbine generator set includes a steam generator, a steam turbine 214, and a generator, etc. When generating electricity, steam is generated by the steam generator, and this steam acts on the steam turbine, causing the steam turbine to drive the generator to generate electricity.

[0063] In this embodiment, the steam generator may include a water container 211, a molten salt tank 212, and a steam pipe 213. The water container 211 contains water; the molten salt tank 212 contains molten salt and is connected to the water container 211. The molten salt in the molten salt tank 212 is high-temperature molten salt, which is continuously heated by a heating device to maintain a high temperature. Thus, the molten salt tank 212 can heat the water in the water container 211 through the molten salt, thereby generating steam. The steam pipe 213 is connected to the water container 211 and can collect the steam generated by heating the water in the water container 211 and output it externally, specifically to the steam turbine 214 of the steam turbine generator set.

[0064] In this embodiment, a steam output terminal is provided in the steam turbine generator set. The energy storage device also includes a second heating module 80, which is connected to the steam output terminal and heats the energy storage chamber 10 based on the steam output from the steam output terminal. Specifically, the second heating module 80 can be opened and closed under the control of the control module 70. In this embodiment, when the control module 70 controls the second heating module 80 to open, by connecting the second heating module 80 to both the steam output terminal and the energy storage chamber 10, the high-temperature steam generated by the steam turbine generator set during operation can be used to heat the energy storage chamber 10. The second heating module 80 and the first heating module 50 can work simultaneously to heat the energy storage chamber 10 together, thereby achieving higher heating efficiency for the energy storage chamber 10.

[0065] In this embodiment, the steam output end can be located at the steam pipe 213 or at a location after the steam passes through the steam turbine. In actual implementation, the specific location of the steam output end can be set as needed.

[0066] Based on the energy storage device described in the above embodiments, the control method for the energy storage device provided by the present invention specifically includes the following steps, as detailed below. Figure 2 .

[0067] First, the temperature information inside the energy storage compartment 10 is detected.

[0068] In this step, the temperature inside the energy storage compartment 10 can be detected and obtained through the temperature detection module 60.

[0069] Secondly, based on the temperature information of the energy storage chamber 10 obtained from the detection, the current environment of the energy storage device is determined, and corresponding operations are performed according to the specific environment.

[0070] Specifically, when the temperature inside the energy storage chamber 10 is higher than the normal operating temperature range, the second power generation module 30 is controlled to supply power to the cooling module 40, or the first power generation module 20 is activated to supply power to the cooling module 40, and the cooling module 40 cools the energy storage chamber 10 in order to reduce the temperature inside the energy storage chamber 10 to the normal operating temperature range.

[0071] In this step, the power supply can be determined by either the first power generation module 20 or the second power generation module 30, based on the specific operating status of the energy storage module 11. Specifically, when the energy storage module 11 can charge and discharge, the second power generation module 30 can generate electricity, which is then supplied to the cooling module 40 via the energy storage module 11, thus eliminating the need to activate the first power generation module 20. As mentioned above, the first power generation module 20 typically relies on fossil fuels for power generation, while the second power generation module 30 can utilize photovoltaic power generation devices, wind power generation devices, etc. Not activating the first power generation module 20 reduces costs and pollution. However, when the energy storage module 11 cannot charge or discharge, the electricity generated by the second power generation module 30 cannot be effectively supplied to the cooling module 40. In this case, the first power generation module 20 is activated, generating electricity to supply power to the cooling module 40.

[0072] In this embodiment, during the cooling process of the cooling module 40, the temperature information inside the energy storage chamber 10 is detected. When the temperature inside the energy storage chamber 10 is within the normal operating temperature range, it is determined whether the cooling system built into the energy storage chamber 10 can maintain the temperature inside the energy storage chamber 10 within the normal operating temperature range. If yes, the cooling module 40 is turned off; if not, the second power generation module 30 supplies power to the cooling module 40.

[0073] For the energy storage module 11, when the temperature inside the energy storage chamber 10 is within its normal operating temperature range, the energy storage module 11 generally has the ability to charge and discharge normally. Under these conditions, the second power generation module 30 has the ability to transfer the electrical energy it generates to the energy storage module 11 for storage, and further supply it to the cooling module 40, etc. Therefore, if the first power generation module 20 was supplying power to the cooling module 40 during the previous cooling process of the energy storage chamber 10, then at this time, the first power generation module 20 can be turned off, and the second power generation module 30 can supply power to the cooling module 40 instead. Moreover, the electrical loads connected to the energy storage device can also be powered by the second power generation module 30 at this time.

[0074] Based on this, if the cooling system of the energy storage chamber 10 can maintain the temperature inside the energy storage chamber 10 within the normal operating temperature range, then there is no need to turn on the cooling module 40. Therefore, the cooling module 40 can be turned off at this time. Correspondingly, before this, whether the first power generation module 20 supplies power to the cooling module 40 or the second power generation module 30 supplies power to the cooling module 40, the power supply can be stopped, the first power generation module 20 can be turned off, or the connection between the second power generation module 30 and the cooling module 40 can be disconnected.

[0075] When the temperature inside the energy storage chamber 10 is lower than the normal operating temperature range, the first power generation module 20 is activated and supplies power to the first heating module 50, which then heats the energy storage chamber 10 to bring the temperature inside the energy storage chamber 10 to the normal operating temperature range.

[0076] When the temperature inside the energy storage chamber 10 is below the normal operating temperature range, the energy storage module 11 typically lacks the ability to charge and discharge, or its charging and discharging efficiency is low, and it cannot meet the power supply needs of the first heating module 50. Therefore, in this step, the first power generation module 20 is directly activated to generate electricity and supply it to the first heating module 50.

[0077] In a further embodiment, when the temperature inside the energy storage chamber 10 is below the normal operating temperature range, the second heating module 80 can be activated. In this case, the second heating module 80 and the first heating module 50 work together to heat the energy storage chamber 10. This achieves higher heating efficiency, allowing the temperature inside the energy storage chamber 10 to rise to the normal operating temperature range more quickly. Of course, in this embodiment, a steam turbine generator set is used as the generator 21 to generate electricity.

[0078] In the above embodiment, during the process of heating the energy storage chamber 10 by the first heating module 50, the temperature information inside the energy storage chamber 10 is detected. When the temperature inside the energy storage chamber 10 is within the normal operating temperature range, it is detected whether the heat generated by the energy storage module 11 itself maintains the temperature inside the energy storage chamber 10 within the normal operating temperature range. If yes, heating the energy storage chamber 10 is stopped; if not, the second power generation module 30 supplies power to the first heating module 50.

[0079] For the energy storage module 11, when the temperature inside the energy storage chamber 10 is within its normal operating temperature range, the energy storage module 11 generally has the ability to charge and discharge normally. Under these conditions, the second power generation module 30 has the ability to transfer the electrical energy it generates to the energy storage module 11 for storage, and further supply it to the first heating module 50, etc. Therefore, during the heating process of the energy storage chamber 10, the first power generation module 20 supplies power to the cooling module 40. At this time, the first power generation module 20 can be turned off, and the second power generation module 30 can supply power to the cooling module 40. Moreover, the electrical energy generated by the second power generation module 30 can also supply power to the electrical loads connected to the energy storage device via the energy storage module 11.

[0080] Based on this, if the heat generated by the energy storage module 11 within the energy storage chamber 10 during operation is sufficient to maintain the temperature within the energy storage chamber 10 within the normal operating temperature range, then there is no need to turn on the first heating module 50. Therefore, the first heating module 50 can be turned off at this time. Correspondingly, prior to this, regardless of whether the first power generation module 20 or the second power generation module 30 supplies power to the first heating module 50, the power supply can be stopped, the first power generation module 20 can be turned off, or the connection between the second power generation module 30 and the cooling module 40 can be disconnected.

[0081] In one embodiment of the control method for the energy storage device, when the temperature inside the energy storage chamber 10 is lower than the normal operating temperature range and less than a first set value, the vacuum pump 59 is also activated, based on the above embodiment, to improve the heating efficiency of the first heating module 50.

[0082] In this embodiment, the first set value is set to a temperature value lower than the lower limit of the normal operating temperature range, and there is a significant temperature difference between it and the normal operating temperature range. For example, if the normal operating temperature range is 0 to 40°C, the first set value can be set to -40°C. Therefore, if the temperature inside the energy storage chamber 10 is lower than the first set value, it means that the energy storage chamber 10 is in an extremely cold environment. At this time, the energy storage module 11 inside the energy storage chamber 10 generally cannot be charged or discharged, and heating up the energy storage chamber 10 requires releasing more heat into the energy storage chamber 10.

[0083] In this embodiment, by activating the vacuum pump 59, the flow rate of the molten salt in the first pipe 51 can be accelerated, thereby increasing the amount of heat exchanged at the heat exchanger 52 per unit time. Correspondingly, the second pipe 53 can provide more heat to the energy storage chamber 10 per unit time, thereby accelerating the heating of the energy storage chamber 10 and quickly raising the temperature inside the energy storage chamber 10 to the normal operating temperature range so that the energy storage module 11 can resume normal charging and discharging.

[0084] In this embodiment, during the process of heating the energy storage chamber 10 by the first heating module 50, the temperature information inside the energy storage chamber 10 is detected. When the temperature inside the energy storage chamber 10 is within the normal operating temperature range, the second power generation module 30 supplies power to the first heating module 50.

[0085] In this embodiment, unlike the above embodiments, after the temperature inside the energy storage chamber 10 is raised to the normal operating temperature range, considering that the external environment where the energy storage device is located is an extremely low temperature and cold environment, the operation of the first heating module 50 is still maintained to raise the temperature of the energy storage chamber 10, instead of relying solely on the energy generated by the energy storage module 11 during operation to maintain the temperature inside the energy storage chamber 10, regardless of whether the heat generated by the energy storage module 11 during operation is sufficient to maintain the temperature inside the energy storage chamber 10 (generally, the heat generated by the energy storage module 11 during operation is insufficient to maintain the temperature inside the energy storage chamber 10, that is, if the temperature inside the energy storage chamber 10 is maintained solely by the heat generated by the energy storage module 11 during operation, the temperature inside the energy storage chamber 10 will drop below the normal operating temperature range after a period of time).

[0086] In summary, the energy storage device and its control method provided in the above embodiments of the present invention detect the temperature information inside the energy storage chamber 10 through the temperature detection module 60. Based on the detected temperature information, the environment of the energy storage chamber 10 and the working status of the energy storage module 11 can be clearly determined. On this basis, according to the needs of the energy storage module 11, the control module 70 can control the cooling module 40, the first heating module 50, etc., to cool or heat the energy storage chamber 10. Furthermore, the energy storage device includes a first power generation device 20, a second power generation device 30, and an energy storage module 11, which can ensure that the power demand of the cooling module 40, the first heating module 50, etc., is met under any temperature environment. That is, under any temperature environment, the temperature inside the energy storage chamber 10 can be cooled or heated to the normal operating temperature range, so that the energy storage module 11 inside the energy storage chamber 10 can resume normal charging and discharging.

[0087] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0088] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An energy storage device, characterized by, The energy storage device includes an energy storage chamber, a first power generation module, a second power generation module, a cooling module, a first heating module, a temperature detection module, and a control module; The energy storage compartment is equipped with an energy storage module; The cooling module is connected to the energy storage chamber and is used to cool the energy storage chamber; The first heating module is connected to the energy storage chamber and is used to heat the energy storage chamber; The first power generation module is used for emergency power generation and is connected to the cooling module and the first heating module; the second power generation module is connected to the energy storage module and is also connected to the cooling module and the first heating module; the energy storage module is connected to the cooling module and the first heating module. The temperature detection module is used to detect the temperature information inside the energy storage compartment; The control module selectively controls the first power generation module, the second power generation module, or the energy storage module to supply power to the cooling module and the first heating module based on the temperature information detected by the temperature detection module.

2. The energy storage device of claim 1, wherein, The first heating module has a heating medium, which is molten salt.

3. The energy storage device of claim 2, wherein, The first heating module includes a first pipe, a heat exchanger, and a second pipe; The first pipeline is equipped with a first molten salt tank, a second molten salt tank, and a drive pump. The first pipe is connected to the heat exchanger, and the connection between the two is located between the first molten salt tank and the second molten salt tank; The drive pump drives the molten salt in the first pipeline to flow along the direction of the first molten salt tank, the heat exchanger, and the second molten salt tank; The second pipeline is connected to both the heat exchanger and the energy storage chamber.

4. The energy storage device according to claim 3, characterized in that, The second molten salt vessel is connected to the first molten salt vessel so that the molten salt flowing out of the second molten salt vessel can flow back into the first molten salt vessel; A first heater is provided between the second molten salt tank and the first molten salt tank, and the first heater is used to heat the molten salt flowing back to the first molten salt tank.

5. The energy storage device of claim 3 or 4, wherein, The first pipe is provided with an air inlet, and a second heater is provided at the air inlet. The second heater is used to heat the gas entering the first pipe from the air inlet.

6. The energy storage device of claim 3, wherein, The first heating module also includes a vacuum pump, which is used to generate negative pressure in the first pipe to accelerate the flow of molten salt in the first pipe.

7. The energy storage device of claim 1, wherein, The first power generation module includes a generator, and the second power generation module includes a photovoltaic power generation device and / or a wind power generation device.

8. The energy storage device of claim 7, wherein, The generator includes a steam turbine generator set.

9. The energy storage device of claim 8, wherein, The steam turbine generator set includes a steam generator, which includes a water container, a molten salt tank, and steam pipes; The water container contains water; The molten salt tank contains molten salt and is connected to the water container. The molten salt is used to heat the water in the water container to generate steam. The steam pipe is connected to the water container to output steam.

10. The energy storage device of claim 8, wherein, The steam turbine generator set has a steam output end; The energy storage device includes a second heating module, which is connected to the steam output terminal and heats the energy storage chamber according to the steam output from the steam output terminal. The second heating module is turned on and off according to the control of the control module.

11. A control method of an energy storage device, employing the energy storage device according to any one of claims 1 to 10, characterized by, The control method for the energy storage device includes: Monitor the temperature information inside the energy storage compartment; When the temperature inside the energy storage chamber is higher than the normal operating temperature range, the second power generation module is controlled to supply power to the cooling module, or the first power generation module is activated to supply power to the cooling module, and the cooling module cools the energy storage chamber. When the temperature inside the energy storage chamber is lower than the normal operating temperature range, the first power generation module is activated and supplies power to the first heating module, which then heats the energy storage chamber.

12. The control method of the energy storage device according to claim 11, wherein The control method for the energy storage device further includes: During the cooling process of the energy storage chamber by the cooling module, the temperature information inside the energy storage chamber is monitored; When the temperature inside the energy storage chamber is within the normal operating temperature range, determine whether the cooling system built into the energy storage chamber can maintain the temperature inside the energy storage chamber within the normal operating temperature range. If yes, the cooling module is shut down; otherwise, the cooling module is powered by the second power generation module.

13. The control method of the energy storage device according to claim 11, wherein When the temperature inside the energy storage chamber is lower than the normal operating temperature range, the second heating module is activated, and the second heating module and the first heating module work together to heat up the energy storage chamber.

14. The control method of the energy storage device according to claim 11 or 13, wherein The control method for the energy storage device further includes: During the process of heating the energy storage chamber by the first heating module, the temperature information inside the energy storage chamber is detected; When the temperature inside the energy storage chamber is within the normal operating temperature range, the system detects whether the heat generated by the energy storage module itself maintains the temperature inside the energy storage chamber within the normal operating temperature range. If yes, then the heating of the energy storage compartment will stop; if not, then the second power generation module will supply power to the first heating module.

15. The control method of the energy storage device according to claim 11 or 13, wherein When the temperature inside the energy storage chamber is lower than the normal operating temperature range and less than the first set value, the vacuum pump is activated to improve the heating efficiency of the first heating module.

16. The control method of the energy storage device according to claim 15, wherein The control method for the energy storage device further includes: During the process of heating the energy storage chamber by the first heating module, the temperature information inside the energy storage chamber is detected; When the temperature inside the energy storage chamber is within the normal operating temperature range, the second power generation module supplies power to the first heating module.

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