Energy storage system and control method of energy storage system

Abstract

This invention relates to the field of energy storage system technology, specifically to an energy storage system and its control method, comprising an energy storage module, a control module, a conversion module, a thermal management module, a charging module, and a monitoring module. By incorporating the energy storage module and the charging module, this energy storage system utilizes the power generation device within the charging module to provide compensatory power supply and discharge to the energy storage module during operation. This effectively reduces the power supply pressure on the energy storage module and increases its power supply time and quantity, resulting in good performance. Furthermore, the charging module enables charging of the energy storage module, reducing reliance on mains power and improving the continuous operation of the energy storage system. This invention offers advantages such as diverse functional modes and high stability in energy storage system use.

Description

Technical Field

[0001] This invention relates to an energy storage system, specifically an energy storage system and a control method for the energy storage system. Background Technology

[0002] Battery energy storage, as an important method of electrical energy storage, has advantages such as flexible configuration of power and energy according to different application needs, fast response speed, no limitation by external conditions such as geographical resources, and suitability for large-scale applications and mass production. These advantages make battery energy storage irreplaceable in areas such as centralized / distributed renewable energy grid connection and grid operation support. In some factories or engineering projects, existing technologies utilize energy storage systems to store electrical energy to ensure normal power supply, thereby enabling prepared and convenient power supply operations.

[0003] Traditional energy storage systems mostly rely solely on mains power for charging, using peak shaving and valley filling to reduce electricity costs. This makes them highly dependent on mains power and limited in their storage method. A prolonged mains power outage can severely impact the system's operation. Furthermore, traditional systems use individual storage units, interconnected and interdependent. Damage to any one of these units during charging and discharging can significantly disrupt the entire system and reduce its operational safety.

[0004] Based on the above reasons, this invention proposes an energy storage system and a control method for the energy storage system. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an energy storage system and a control method for the energy storage system.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] An energy storage system includes an energy storage module, a control module, a conversion module, a thermal management module, a charging module, and a monitoring module;

[0008] The energy storage module is used for storing electrical energy. This energy storage system contains at least two sets of energy storage modules, and the energy storage modules are set up independently of each other.

[0009] The control module is used to control the charging time, discharging time and power of the energy storage system, control the charging and discharging process of the energy storage module and realize intelligent control operation of the energy storage system.

[0010] The conversion module is used to adjust and change the form of electrical energy, and can also adjust and change the charging and discharging form of the energy storage module, thereby achieving stable operation of the energy storage module.

[0011] The thermal management module is used to control the temperature in the energy storage system, ensuring that the energy storage system operates stably at a suitable temperature. It can also perform high temperature alarms and emergency fire extinguishing operations to ensure the safe use of the energy storage system.

[0012] The charging module is used to charge the energy storage module in the energy storage system to realize the energy storage function of the energy storage module. The charging module consists of an active power generation device and a mains charging device. The power generation device includes one or more of wind power generation devices, solar power generation devices and hydrogen storage power generation devices.

[0013] The monitoring module is used to monitor various data of the energy storage system during operation, enabling real-time monitoring of the system's status and ensuring its normal and safe operation.

[0014] As a preferred embodiment of the present invention, the energy storage module is composed of several lithium battery packs, each of which can store the same level of electrical energy, and each of which is equipped with a separate control system.

[0015] As a preferred embodiment of the present invention, the conversion module can realize the operation of converting DC power to AC power and AC power to DC power, and the conversion module is equipped with an inverter.

[0016] As a preferred embodiment of the present invention, the thermal management module is equipped with a water cooling device, an air cooling device, a temperature monitoring device, an alarm device, and a fire extinguishing device.

[0017] The water-cooling device is distributed and installed at various key equipment in the energy storage module and energy storage system, which can efficiently remove heat from the inside of the energy storage system through coolant.

[0018] The air-cooling device enables air circulation between the energy storage system and the external environment, further improving the heat dissipation efficiency of the energy storage system and enhancing its operational stability.

[0019] The temperature monitoring device is used to monitor the heat of various parts of the energy storage system in real time, so as to avoid the impact of high temperature on the stable operation of the energy storage system.

[0020] The alarm device is used to record and alarm on abnormal high-temperature conditions, so as to facilitate and promptly handle abnormal situations.

[0021] The fire extinguishing device is used to extinguish sudden fires in the energy storage system, and the fire extinguishing agent used in the fire extinguishing device is perfluorohexanone.

[0022] As a preferred embodiment of the present invention, the charging module, when in use, includes the following steps:

[0023] S51: When the energy storage module is storing energy, the charging amount of the energy storage module is controlled by the control module, and a portion of the charging amount is reserved for charging through the power generation equipment in the charging module.

[0024] S52: After the energy storage module has finished storing energy, the control module controls the power transmission line of the charging module, so that the power generated by the charging module is directly transmitted to the electrical equipment, and the direct power supply operation is realized through the charging module.

[0025] S53: When the energy storage module is discharging, the power generation device inside the charging module directly provides auxiliary power compensation to the external electrical equipment under the control of the control module, reducing the power supply pressure of the energy storage module and increasing the service life of the energy storage system.

[0026] S54: When the energy storage system discharges to the warning level and the external system still needs a larger power supply, the control module shuts down the energy storage module and simultaneously generates electricity from the charging module to compensate the grid and connect to the external energy storage system to ensure the safety of the energy storage system.

[0027] As a preferred embodiment of the present invention, the monitoring operation of the monitoring module during the charging and discharging operation of the energy storage module includes the following steps:

[0028] S61: First, a monitoring module is set on each lithium battery pack in the energy storage module and the lithium battery pack is numbered. The monitoring module includes a temperature sensor and a current and voltage sensor to realize real-time monitoring of the temperature, current and voltage of each lithium battery pack during charging and discharging.

[0029] S62: When the energy storage module is charging and discharging, it performs charging and discharging operations according to the numbering of the lithium battery pack in the system.

[0030] S63: When an abnormal situation occurs in the monitoring data of a certain lithium battery pack during charging and discharging operations, such as high temperature or large deviation of voltage and current, the monitoring module disconnects the lithium battery pack with this number from the energy storage system and records it in the control module. This operation is repeated to complete the charging and discharging operations of all lithium battery packs in the energy storage module.

[0031] S64: Then, based on the number in the control module, perform a charge and discharge test on the lithium battery pack. If the monitoring module monitors the data of the lithium battery pack normally, then reconnect the lithium battery pack to the energy storage module. If the monitoring module still shows abnormal monitoring data, then determine that the lithium battery pack with this number is damaged and continue to monitor and alarm in the disconnected state.

[0032] S65: Perform repair and replacement of a lithium battery pack with a specified number on an energy storage module that has a damaged lithium battery pack, provided that another energy storage module ensures normal power supply.

[0033] A control method for an energy storage system includes the following steps:

[0034] S1: Perform charging operation on this energy storage system. During off-peak electricity consumption periods, charge the energy storage module to achieve mains power energy storage operation, and combine with the power generation device in the charging module to achieve compensatory charging operation on the energy storage module.

[0035] S2: During peak electricity consumption periods, disconnect the mains charging mode and use the power generation device inside the charging module to charge and store energy in the energy storage module.

[0036] S3: During the discharge process of the energy storage system, the stored electrical energy is discharged through the energy storage module, and the charging module is used to compensate the power supply to the electrical device, thereby reducing the power supply pressure of the energy storage system and increasing the operating time of the energy storage system.

[0037] S4: When the energy storage module in the energy storage system discharges to the warning level, the connection between the energy storage module and the external electrical equipment is disconnected, and the charging module is connected to the external electrical equipment. The power supply operation to the external equipment is realized by fully charging the module.

[0038] S5: When the energy storage module is disconnected, another external energy storage system automatically connects to the power supply equipment and discharges through the energy storage system that combines the other energy storage system and the charging module.

[0039] S6: After the energy storage system has finished discharging, perform the energy storage operation on the energy storage system as described in steps 1 and 2 above, and realize the use of the energy storage system.

[0040] This invention provides an energy storage system and a control method for the energy storage system, which have the following beneficial effects:

[0041] 1. This invention, by setting up an energy storage module and a charging module, enables the energy storage system to perform compensatory power supply and discharge operations on the energy storage module through the power generation device inside the charging module during use. On the one hand, it can effectively reduce the power supply pressure on the energy storage module, and on the other hand, it can increase the power supply time and power supply of the energy storage module, resulting in good performance. Furthermore, because the charging module can be set up to charge the energy storage module, it reduces the dependence on mains power energy storage and improves the continuous use effect of the energy storage system.

[0042] 2. This invention incorporates a thermal management module, which enables a combination of air cooling and water cooling to reduce the temperature inside the energy storage module. This effectively ensures the stable operation of the energy storage system, prevents the impact of high temperatures on energy storage, and also effectively extinguishes sudden fires, thereby improving the safety of the energy storage system.

[0043] 3. This invention incorporates a monitoring module that charges the lithium battery packs within the energy storage module one by one. This allows for individual monitoring and control of each lithium battery pack, preventing the impact of a single damaged battery pack on the overall energy storage performance. Furthermore, it effectively improves the stability of the energy storage system. By combining multiple energy storage modules, it enables power conversion between modules, facilitating maintenance of the lithium battery packs and resulting in excellent performance. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 This is a flowchart of an energy storage system control method according to the present invention;

[0046] Figure 2 This is a structural diagram of an energy storage system and its components according to the present invention.

[0047] Figure 3 This is a flowchart illustrating the use of an energy storage system charging module according to the present invention;

[0048] Figure 4 This is a flowchart of the monitoring operation of an energy storage system monitoring module during the charging and discharging operation of the energy storage module according to the present invention;

[0049] Figure 5 This is a structural diagram of the thermal management module in an energy storage system according to the present invention. Detailed Implementation

[0050] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0051] Example: Figure 1-5 As shown, an energy storage system includes an energy storage module, a control module, a conversion module, a thermal management module, a charging module, and a monitoring module;

[0052] The energy storage module is used for storing electrical energy. This energy storage system contains at least two sets of energy storage modules, and the energy storage modules are set up independently. The energy storage module consists of several lithium battery packs. Each set of lithium battery packs can store the same level of electrical energy, and each set of lithium battery packs is equipped with a separate control system.

[0053] The control module is used to control the charging time, discharging time and power of the energy storage system, control the charging and discharging process of the energy storage module and realize intelligent control operation of the energy storage system.

[0054] The conversion module is used to adjust and change the form of electrical energy, and can also adjust and change the charging and discharging form of the energy storage module, thereby achieving stable operation of the energy storage module. The conversion module can convert DC to AC and AC to DC, and an inverter is installed inside the conversion module.

[0055] The thermal management module is used to control the temperature in the energy storage system, ensuring that the energy storage system operates stably at a suitable temperature. It can also realize high temperature alarm and emergency fire extinguishing operation for the energy storage system, ensuring the safe use of the energy storage system. The thermal management module is equipped with a water cooling device, an air cooling device, a temperature monitoring device, an alarm device, and a fire extinguishing device.

[0056] Water-cooling devices are distributed and installed at various key equipment points of the energy storage module and energy storage system, enabling efficient removal of heat from the energy storage system via coolant.

[0057] The air-cooling device enables air circulation between the energy storage system and the external environment, further improving the heat dissipation efficiency of the energy storage system and enhancing its operational stability.

[0058] Temperature monitoring devices are used to monitor the heat of various parts of the energy storage system in real time, so as to avoid the impact of high temperature on the stable operation of the energy storage system.

[0059] The alarm device is used to record and alarm on abnormal high-temperature conditions, so as to facilitate and promptly handle the abnormal situation.

[0060] The fire extinguishing device is used to extinguish sudden fires in energy storage systems. The extinguishing agent used in the fire extinguishing device is perfluorohexanone.

[0061] The charging module is used to charge the energy storage modules in the energy storage system to realize the energy storage function of the energy storage modules. The charging module consists of an active power generation device and a mains charging device. The power generation device includes one or more of wind power generation devices, solar power generation devices and hydrogen storage power generation devices.

[0062] The charging module is used in accordance with the following steps:

[0063] S51: When the energy storage module is storing energy, the charging amount of the energy storage module is controlled by the control module, and a portion of the charging amount is reserved for charging through the power generation equipment in the charging module.

[0064] S52: After the energy storage module has finished storing energy, the control module controls the power transmission line of the charging module, so that the power generated by the charging module is directly transmitted to the electrical equipment, and the direct power supply operation is realized through the charging module.

[0065] S53: When the energy storage module is discharging, the power generation device inside the charging module directly provides auxiliary power compensation to the external electrical equipment under the control of the control module, reducing the power supply pressure of the energy storage module and increasing the service life of the energy storage system.

[0066] S54: When the energy storage system discharges to the warning level and the external system still needs a larger power supply, the control module shuts down the energy storage module and simultaneously generates electricity from the charging module to compensate the grid and connect to the external energy storage system to ensure the safety of the energy storage system.

[0067] The monitoring module is used to monitor various data during the operation of the energy storage system, enabling real-time monitoring of the system's status and ensuring its normal and safe operation.

[0068] The monitoring module performs the following steps during the charging and discharging operation of the energy storage module:

[0069] S61: First, a monitoring module is set on each lithium battery pack in the energy storage module and the lithium battery pack is numbered. The monitoring module includes a temperature sensor and a current and voltage sensor to realize real-time monitoring of the temperature, current and voltage of each lithium battery pack during charging and discharging.

[0070] S62: When the energy storage module is charging and discharging, it performs charging and discharging operations according to the numbering of the lithium battery pack in the system.

[0071] S63: When an abnormal situation occurs in the monitoring data of a certain lithium battery pack during charging and discharging operations, such as high temperature or large deviation of voltage and current, the monitoring module disconnects the lithium battery pack with this number from the energy storage system and records it in the control module. This operation is repeated to complete the charging and discharging operations of all lithium battery packs in the energy storage module.

[0072] S64: Then, based on the number in the control module, perform a charge and discharge test on the lithium battery pack. If the monitoring module monitors the data of the lithium battery pack normally, then reconnect the lithium battery pack to the energy storage module. If the monitoring module still shows abnormal monitoring data, then determine that the lithium battery pack with this number is damaged and continue to monitor and alarm in the disconnected state.

[0073] S65: Perform repair and replacement of a lithium battery pack with a specified number on an energy storage module that has a damaged lithium battery pack, provided that another energy storage module ensures normal power supply.

[0074] A control method for an energy storage system includes the following steps:

[0075] S1: Perform charging operation on this energy storage system. During off-peak electricity consumption periods, charge the energy storage module to achieve mains power energy storage operation, and combine with the power generation device in the charging module to achieve compensatory charging operation on the energy storage module.

[0076] S2: During peak electricity consumption periods, disconnect the mains charging mode and use the power generation device inside the charging module to charge and store energy in the energy storage module.

[0077] S3: During the discharge process of the energy storage system, the stored electrical energy is discharged through the energy storage module, and the charging module is used to compensate the power supply to the electrical device, thereby reducing the power supply pressure of the energy storage system and increasing the operating time of the energy storage system.

[0078] S4: When the energy storage module in the energy storage system discharges to the warning level, the connection between the energy storage module and the external electrical equipment is disconnected, and the charging module is connected to the external electrical equipment. The power supply operation to the external equipment is realized by fully charging the module.

[0079] S5: When the energy storage module is disconnected, another external energy storage system automatically connects to the power supply equipment and discharges through the energy storage system that combines the other energy storage system and the charging module.

[0080] S6: After the energy storage system has finished discharging, perform the energy storage operation on the energy storage system as described in steps 1 and 2 above, and realize the use of the energy storage system.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy storage system, characterized in that, It includes an energy storage module, a control module, a conversion module, a thermal management module, a charging module, and a monitoring module; The energy storage module is used for storing electrical energy. This energy storage system contains at least two sets of energy storage modules, and the energy storage modules are set up independently of each other. The control module is used to control the charging time, discharging time and power of the energy storage system, control the charging and discharging process of the energy storage module and realize intelligent control operation of the energy storage system. The conversion module is used to adjust and change the form of electrical energy, and can also adjust and change the charging and discharging form of the energy storage module, thereby achieving stable operation of the energy storage module. The thermal management module is used to control the temperature in the energy storage system, ensuring that the energy storage system operates stably at a suitable temperature. It can also perform high temperature alarms and emergency fire extinguishing operations to ensure the safe use of the energy storage system. The charging module is used to charge the energy storage module in the energy storage system to realize the energy storage function of the energy storage module. The charging module consists of an active power generation device and a mains charging device. The power generation device includes one or more of wind power generation devices, solar power generation devices and hydrogen storage power generation devices. The monitoring module is used to monitor various data of the energy storage system during operation, enabling real-time monitoring of the energy storage system's status and ensuring its normal and safe operation. When the charging module is in use, the following steps are included: S51: When the energy storage module is storing energy, the charging amount of the energy storage module is controlled by the control module, and a portion of the charging amount is reserved for charging through the power generation equipment in the charging module. S52: After the energy storage module has finished storing energy, the control module controls the power transmission line of the charging module, so that the power generated by the charging module is directly transmitted to the electrical equipment, and the direct power supply operation is realized through the charging module. S53: When the energy storage module is discharging, the power generation device inside the charging module directly provides auxiliary power compensation to the external electrical equipment under the control of the control module, reducing the power supply pressure of the energy storage module and increasing the service life of the energy storage system. S54: When the energy storage system discharges to the warning level and the external system still needs a larger power supply, the control module shuts down the energy storage module and simultaneously generates electricity from the charging module to compensate the grid and connect to the external energy storage system to ensure the safety of the energy storage system. The monitoring module's monitoring operations during the charging and discharging of the energy storage module include the following steps: S61: First, a monitoring module is set on each lithium battery pack in the energy storage module and the lithium battery pack is numbered. The monitoring module includes a temperature sensor and a current and voltage sensor to realize real-time monitoring of the temperature, current and voltage of each lithium battery pack during charging and discharging. S62: When the energy storage module is charging and discharging, it performs charging and discharging operations according to the numbering of the lithium battery pack in the system. S63: When an abnormal situation occurs in the monitoring data of a certain lithium battery pack during charging and discharging operations, such as high temperature or large deviation of voltage and current, the monitoring module disconnects the lithium battery pack with this number from the energy storage system and records it in the control module. This operation is repeated to complete the charging and discharging operations of all lithium battery packs in the energy storage module. S64: Then, based on the number in the control module, perform a charge and discharge test on the lithium battery pack. If the monitoring module monitors the data of the lithium battery pack normally, then reconnect the lithium battery pack to the energy storage module. If the monitoring module still shows abnormal monitoring data, then determine that the lithium battery pack with this number is damaged and continue to monitor and alarm in the disconnected state. S65: Perform repair and replacement of a lithium battery pack with a specified number on an energy storage module that has a damaged lithium battery pack, provided that another energy storage module ensures normal power supply.

2. The energy storage system according to claim 1, characterized in that, The energy storage module consists of several lithium battery packs, each of which can store the same level of electrical energy, and each of which is equipped with a separate control system.

3. The energy storage system according to claim 1, characterized in that, The conversion module can convert DC power to AC power and AC power to DC power, and an inverter is installed inside the conversion module.

4. The energy storage system according to claim 1, characterized in that, The thermal management module is equipped with a water cooling device, an air cooling device, a temperature monitoring device, an alarm device, and a fire extinguishing device. The water-cooling device is distributed and installed at various key equipment in the energy storage module and energy storage system, which can efficiently remove heat from the inside of the energy storage system through coolant. The air-cooling device enables air circulation between the energy storage system and the external environment, further improving the heat dissipation efficiency of the energy storage system and enhancing its operational stability. The temperature monitoring device is used to monitor the heat of various parts of the energy storage system in real time, so as to avoid the impact of high temperature on the stable operation of the energy storage system. The alarm device is used to record and alarm on abnormal high-temperature conditions, so as to facilitate and promptly handle abnormal situations. The fire extinguishing device is used to extinguish sudden fires in the energy storage system, and the fire extinguishing agent used in the fire extinguishing device is perfluorohexanone.

5. A control method for an energy storage system according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Perform charging operation on this energy storage system. During off-peak electricity consumption periods, charge the energy storage module to achieve mains power energy storage operation, and combine with the power generation device in the charging module to achieve compensatory charging operation on the energy storage module. S2: During peak electricity consumption periods, disconnect the mains charging mode and use the power generation device inside the charging module to charge and store energy in the energy storage module. S3: During the discharge process of the energy storage system, the stored electrical energy is discharged through the energy storage module, and the charging module is used to compensate the power supply to the electrical device, thereby reducing the power supply pressure of the energy storage system and increasing the operating time of the energy storage system. S4: When the energy storage module in the energy storage system discharges to the warning level, the connection between the energy storage module and the external electrical equipment is disconnected, and the charging module is connected to the external electrical equipment to supply power to the external equipment. S5: When the energy storage module is disconnected, another external energy storage system automatically connects to the power supply equipment and discharges through the energy storage system that combines the other energy storage system and the charging module. S6: After the energy storage system has finished discharging, perform the energy storage operation on the energy storage system as described in steps 1 and 2 above, and realize the use of the energy storage system.

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