Energy storage high-voltage box and control method thereof

Abstract

The present invention discloses a high-pressure energy storage box and a control method thereof, comprising: when it is determined that the high-pressure energy storage box is in a pressure-deficient state based on the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module, controlling the air supply module to open; or, when it is determined that the high-pressure energy storage box is in an abnormal temperature state, controlling the air supply module to open and controlling the pressure relief valve to open to discharge the gas in the high-pressure energy storage box. In this embodiment, the state of the high-pressure energy storage box is determined based on the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module provided in the high-pressure energy storage box, and different control strategies are executed according to the state of the high-pressure energy storage box to solve the problems of deformation, leakage and insulation failure caused by gas escape in the high-pressure energy storage box in high-altitude areas, and at the same time construct a control method for rapid response, fire extinguishing and explosion suppression, thereby improving the service life of the high-pressure energy storage box in extreme environments.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to an energy storage high-voltage box and a control method thereof. Background Art

[0002] With the widespread deployment of new energy storage systems in high-altitude areas (e.g., altitudes ≥3,000 meters), the design of traditional containerized energy storage high-voltage boxes faces significant challenges. Lower atmospheric pressure, decreased air density, and increased day-night temperature swings at high altitudes degrade the equipment's insulation and heat dissipation performance. Furthermore, the insulation strength of air decreases significantly, requiring the safe gap between electrodes to increase by 20% to 30% to meet the same withstand voltage rating. Furthermore, pressure imbalances within the sealed structure can easily cause partial discharge, further threatening system reliability. Summary of the Invention

[0003] The present invention provides an energy storage high-voltage box and a control method thereof, so as to solve the potential safety hazards of the energy storage high-voltage box in high-altitude areas.

[0004] According to one aspect of the present invention, a control method for a high-pressure energy storage box is provided, wherein the high-pressure energy storage box is provided with a pressure acquisition module, a temperature acquisition module, a gas supply module and a pressure relief valve, and the gas supply module is used to provide a preset gas to the high-pressure energy storage box;

[0005] The control method of the energy storage high-voltage box includes:

[0006] When it is determined that the energy storage high-pressure box is in a pressure-deficient state according to the air pressure value obtained by the air pressure obtaining module and the temperature value obtained by the temperature obtaining module, controlling the air supply module to open;

[0007] Alternatively, when it is determined that the energy storage high-pressure box is in an abnormal temperature state according to the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module, the air supply module is controlled to open, and the pressure relief valve is controlled to open to discharge the gas in the energy storage high-pressure box.

[0008] Optionally, the air pressure acquisition module includes a first air pressure sensor and a second air pressure sensor, and the first air pressure sensor and the second air pressure sensor are arranged at different positions in the energy storage high-pressure box;

[0009] Determining that the energy storage high-pressure box is in a pressure-deficient state according to the air pressure value obtained by the air pressure obtaining module and the temperature value obtained by the temperature obtaining module includes:

[0010] When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, the average value of the first air pressure value and the second air pressure value is less than or equal to the first air pressure threshold, and the temperature value is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the energy storage high-pressure box is in a pressure-deficient state.

[0011] Optionally, the air pressure acquisition module includes a first air pressure sensor and a second air pressure sensor, and the first air pressure sensor and the second air pressure sensor are arranged at different positions in the energy storage high-pressure box;

[0012] When it is determined that the energy storage high-pressure box is in a pressure-deficient state according to the air pressure value obtained by the air pressure obtaining module and the temperature value obtained by the temperature obtaining module, after controlling the air supply module to be turned on, the method further includes:

[0013] Correcting the first air pressure value acquired in real time by the first air pressure sensor to a first corrected air pressure value corresponding to a reference temperature, and correcting the second air pressure value acquired in real time by the second air pressure sensor to a second corrected air pressure value corresponding to the reference temperature;

[0014] The opening size of the air supply module is adjusted according to the first corrected air pressure value, the second corrected air pressure value and the target pressure value until the absolute value of the difference between the first corrected air pressure value and the second corrected air pressure value is determined to be less than or equal to the preset difference, and the average value of the first corrected air pressure value and the second corrected air pressure value reaches the air pressure setting value, and the air supply module is controlled to be closed.

[0015] Optionally, the air pressure acquisition module includes a first air pressure sensor and a second air pressure sensor, and the first air pressure sensor and the second air pressure sensor are arranged at different positions in the energy storage high-pressure box;

[0016] The determining that the energy storage high-pressure box is in an abnormal temperature state according to the air pressure value obtained by the air pressure obtaining module and the temperature value obtained by the temperature obtaining module includes:

[0017] When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, the average value of the first air pressure value and the second air pressure value is greater than or equal to the second air pressure threshold, and the temperature value is greater than the second temperature setting value, it is determined that the energy storage high-pressure box is in an abnormal temperature state.

[0018] Optionally, when it is determined that the energy storage high-pressure box is in an abnormal temperature state according to the air pressure value obtained by the air pressure obtaining module and the temperature value obtained by the temperature obtaining module, controlling the air supply module to open includes:

[0019] The air supply module is controlled to be closed once every first set time after being opened, and the duration of each closing is equal to the second set time.

[0020] Optionally, the air pressure acquisition module includes a first air pressure sensor and a second air pressure sensor, and the first air pressure sensor and the second air pressure sensor are arranged at different positions in the energy storage high-pressure box.

[0021] The control method of the energy storage high-voltage box also includes:

[0022] When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, the average value of the first air pressure value and the second air pressure value is greater than or equal to the first air pressure threshold and less than or equal to the second air pressure threshold, and the temperature value is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the energy storage high-pressure box is in a normal working state.

[0023] Optionally, the air pressure acquisition module includes a first air pressure sensor and a second air pressure sensor, and the first air pressure sensor and the second air pressure sensor are arranged at different positions in the energy storage high-pressure box;

[0024] The control method of the energy storage high-voltage box also includes:

[0025] When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is greater than a preset difference, and the temperature value obtained by the temperature acquisition module is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the air pressure acquisition module is faulty and an air pressure acquisition module fault signal is output.

[0026] According to another aspect of the present invention, there is provided a high-pressure energy storage box, comprising: a sealed box, an air pressure acquisition module, a temperature acquisition module, an air supply module, a pressure relief valve, and a battery management system, wherein the air pressure acquisition module, the temperature acquisition module, the air supply module, and the battery management system are all disposed in the sealed box, and the pressure relief valve is disposed on an operation panel of the sealed box;

[0027] The air pressure acquisition module is used to obtain the air pressure value in the energy storage high-pressure box;

[0028] The temperature acquisition module is used to obtain the temperature value inside the energy storage high-voltage box;

[0029] The gas supply module is used to provide preset gas to the energy storage high-pressure box;

[0030] The pressure relief valve is used to discharge the gas in the energy storage high-pressure box;

[0031] The battery management system is connected to the air pressure acquisition module, the temperature acquisition module, the air supply module and the pressure relief valve respectively, and the battery management system is used to execute the control method of the energy storage high-voltage box described in the above aspect.

[0032] Optionally, the energy storage high-voltage box further includes a cover plate and a sealing rubber pad, and the sealing rubber pad is located between the cover plate and the upper surface of the sealed box body.

[0033] Optionally, a plurality of first openings are provided at each frame position of the cover plate, a screw is provided at each first opening, a second opening corresponding to the first opening is provided at each frame position of the sealing rubber pad, a protrusion for a rivet nut corresponding to the first opening is provided at each frame position of the upper surface of the sealed box body, and the cover plate is fixed to the sealed box body by each of the screws;

[0034] For any one of the first openings, the vertical projection of the first opening covers the vertical projection of the second opening, and the vertical projection of the first opening covers the vertical projection of the rivet nut.

[0035] The technical solution of the embodiment of the present invention is to control the opening of the gas replenishment module to replenish the preset gas into the energy storage high-pressure box when it is determined based on the air pressure and temperature values ​​inside the energy storage high-pressure box that the box is in a state of underpressure, that is, when the air pressure inside the box decreases due to a small amount of gas escaping after being located at a high altitude and operating for a long time. This increases the air pressure inside the energy storage high-pressure box, offsets the negative pressure caused by the low air pressure at high altitude or gas escape, and ensures the reliability of the seal. When it is determined that the temperature inside the energy storage high-pressure box is abnormal, it is judged that a fire may occur inside the box, and the pressure relief valve is controlled to open to achieve rapid pressure relief to avoid explosion. The preset gas is simultaneously released to dilute the oxygen concentration, thereby resolving the secondary risk of oxygen-assisted combustion after pressure relief. In this embodiment, the state of the energy storage high-voltage box is determined based on the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module provided in the energy storage high-voltage box, and different control strategies are executed according to the state of the energy storage high-voltage box to solve the problems of deformation, leakage and insulation failure caused by gas escape of the energy storage high-voltage box in high-altitude areas. At the same time, a control method with rapid response, fire extinguishing and explosion suppression is constructed to extend the service life of the energy storage high-voltage box in extreme environments.

[0036] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A flow chart of a control method for an energy storage high-voltage box provided in an embodiment of the present invention;

[0039] Figure 2 A flow chart of another method for controlling an energy storage high-voltage box provided by an embodiment of the present invention;

[0040] Figure 3 A schematic structural diagram of an energy storage high-voltage box provided in an embodiment of the present invention;

[0041] Figure 4 A top view of an energy storage high-voltage box provided in an embodiment of the present invention;

[0042] Figure 5 A schematic structural diagram of another energy storage high-voltage box provided in an embodiment of the present invention;

[0043] Figure 6 A partially enlarged view of an energy storage high-voltage box provided in an embodiment of the present invention;

[0044] Figure 7 This is a schematic structural diagram of an energy storage high-voltage box after assembly provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] The energy storage high-pressure box is equipped with an air pressure acquisition module, a temperature acquisition module, an air supply module and a pressure relief valve. The air supply module is used to provide preset gas to the energy storage high-pressure box. Figure 1 This is a flow chart of a control method for an energy storage high-voltage box provided by an embodiment of the present invention, with reference to Figure 1 , the method comprising:

[0048] S110: The air pressure value in the energy storage high-pressure box is obtained through the air pressure acquisition module, and the temperature value in the energy storage high-pressure box is obtained through the temperature acquisition module. S120 or S130 is executed after S110.

[0049] The air pressure acquisition module can be a pressure sensor for detecting the air pressure value within the energy storage high-pressure box in real time. The temperature acquisition module can be a temperature sensor for detecting the temperature value within the energy storage high-pressure box in real time. The air pressure value within the energy storage high-pressure box is obtained by acquiring the output value of the air pressure acquisition module, and the temperature value within the energy storage high-pressure box is obtained by acquiring the output value of the temperature acquisition module.

[0050] S120: When it is determined that the energy storage high-pressure box is in a pressure-deficient state according to the air pressure value obtained by the air pressure obtaining module and the temperature value obtained by the temperature obtaining module, the air supply module is controlled to open.

[0051] The gas replenishment module is used to output a preset gas to the energy storage high-pressure box to maintain the positive pressure in the box by injecting the preset gas. Optionally, the preset gas is a stable gas that is difficult to react with other substances at normal temperature and pressure, such as nitrogen. In the under-pressure state, the air pressure value in the energy storage high-pressure box is less than the first air pressure threshold, which is the minimum value of the normal range of atmospheric pressure at normal temperature. At normal temperature, for example, at a reference temperature of 298K, the normal atmospheric pressure range is 980hPa to 1080hPa, and the first air pressure threshold is set to 980hPa.

[0052] In one optional embodiment, when the pressure inside the high-voltage energy storage tank falls below a set value and the temperature is within the set normal temperature range, the tank is determined to be under-pressurized. The air supply module is activated, injecting nitrogen to maintain positive pressure inside the tank, offsetting negative pressure caused by low altitude or gas escape, and ensuring a reliable seal. Nitrogen has a dielectric strength approximately 1.5 times that of air, improving the insulation of the high-voltage energy storage tank, compensating for decreased air density, raising the arc breakdown threshold, and increasing safety clearances or reducing capacity.

[0053] S130: When it is determined that the energy storage high-pressure box is in an abnormal temperature state according to the air pressure value obtained by the air pressure obtaining module and the temperature value obtained by the temperature obtaining module, the air supply module is controlled to open, and the pressure relief valve is controlled to open to discharge the gas in the energy storage high-pressure box.

[0054] The abnormal temperature state is a state in which a fire occurs in the energy storage high-pressure box. In an optional embodiment, when the temperature value inside the energy storage high-pressure box is greater than a temperature setting value, the abnormally high temperature inside the energy storage high-pressure box causes the air pressure inside the energy storage high-pressure box to increase until the air pressure value is greater than a setting value, such as the maximum value of the normal range of atmospheric pressure at room temperature, then the energy storage high-pressure box is determined to be in an abnormal temperature state. At this time, there is a high probability of a fire occurring in the energy storage high-pressure box. The pressure relief valve is controlled to open to achieve rapid pressure relief to avoid explosion in the event of a fire. At the same time, the air supply module is controlled to open and nitrogen is released synchronously to dilute the oxygen concentration, thereby solving the secondary risk of oxygen-assisted combustion after pressure relief. When a fire occurs, it relies on electric control intelligent triggering, with a response time of less than 50ms, which is significantly better than a mechanical pressure relief device.

[0055] Optionally, when it is determined that the energy storage high-voltage box is in an abnormal temperature state, an audible and visual alarm is issued through the junction cabinet to remind the operating personnel.

[0056] The technical solution of the embodiment of the present invention is to control the opening of the gas replenishment module to replenish the preset gas into the energy storage high-pressure box when it is determined based on the air pressure and temperature values ​​within the energy storage high-pressure box that the box is in a pressure-deficient state, that is, when the air pressure in the box decreases due to a small amount of gas escaping after being located at a high altitude and operating for a long time. This increases the air pressure within the energy storage high-pressure box, offsets the negative pressure caused by the low air pressure at high altitude or gas escape, and ensures sealing reliability. When it is determined that the temperature within the energy storage high-pressure box is abnormal, it is judged that a fire may have occurred within the box, and the pressure relief valve is controlled to open to achieve rapid pressure relief to avoid explosion. The preset gas is simultaneously released to dilute the oxygen concentration, thereby resolving the secondary risk of oxygen-assisted combustion after pressure relief. In this embodiment, the state of the energy storage high-voltage box is determined based on the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module provided in the energy storage high-voltage box, and different control strategies are executed according to the state of the energy storage high-voltage box to solve the problems of deformation, leakage and insulation failure caused by gas escape of the energy storage high-voltage box in high-altitude areas. At the same time, a control method with rapid response, fire extinguishing and explosion suppression is constructed to extend the service life of the energy storage high-voltage box in extreme environments.

[0057] Optionally, the air pressure acquisition module includes a first air pressure sensor and a second air pressure sensor, and the first air pressure sensor and the second air pressure sensor are arranged at different positions in the energy storage high-pressure box. Figure 2 This is a flowchart of another method for controlling an energy storage high-voltage box according to an embodiment of the present invention. Figure 2 , the method comprising:

[0058] S111: Acquire a first air pressure value in the energy storage high-pressure box through a first air pressure sensor, acquire a second air pressure value in the energy storage high-pressure box through a second air pressure sensor, and acquire a temperature value in the energy storage high-pressure box through a temperature acquisition module.

[0059] After obtaining the first air pressure value, the second air pressure value and the temperature value, a state judgment is performed, that is, S121 is executed. After executing S121, one of the following S131, S161, S171 and S181 is executed respectively according to the different states of the energy storage high-voltage box.

[0060] S121: Determine the state of the energy storage high-pressure box based on the first air pressure value, the second air pressure value, and the temperature value. If the energy storage high-pressure box is in the pressure-deficient state a, execute S131, S141, and S151 in sequence. If the energy storage high-pressure box is in the temperature abnormal state b, execute S161. If the energy storage high-pressure box is in the normal working state c, execute S171. If the energy storage high-pressure box is in the air pressure acquisition module failure state d, execute S181. Among them, when the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, the average value of the first air pressure value and the second air pressure value is less than or equal to the first air pressure threshold, and the temperature value is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the energy storage high-pressure box is in the pressure-deficient state a; when the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, the average value of the first air pressure value and the second air pressure value is greater than or equal to the second air pressure threshold, and the temperature value is greater than the second temperature setting value, it is determined that the energy storage high-pressure box is in the temperature abnormality state b ... When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, the average of the first air pressure value and the second air pressure value is greater than or equal to the first air pressure threshold and less than or equal to the second air pressure threshold, and the temperature value is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the energy storage high-pressure box is in normal working state c; when the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is greater than the preset difference, and the temperature value obtained by the temperature acquisition module is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the air pressure acquisition module is faulty, and the energy storage high-pressure box is determined to be in air pressure acquisition module fault state d. The first air pressure threshold is less than the second air pressure threshold, and the first temperature setting value is less than the second temperature setting value.

[0061] S131: Control the air supply module to open.

[0062] When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, it indicates that the air pressure values ​​obtained by the two air pressure sensors are similar, and both air pressure sensors can work normally, so as to avoid the situation where a single air pressure sensor fails, resulting in an inaccurate air pressure value collected in the energy storage high-pressure box, causing the control of the energy storage high-pressure box to malfunction. Optionally, the preset difference can be equal to 10hPa, which can be determined according to the detection accuracy of the first air pressure sensor and the second air pressure sensor, and is not specifically limited. The first air pressure threshold is the minimum value of the normal range of atmospheric pressure at the reference temperature, such as 980hPa. When the average value of the air pressure values ​​obtained by the two air pressure sensors is less than or equal to 980hPa, it indicates that the air pressure in the energy storage high-pressure box is low and deviates from the normal range of atmospheric pressure. Optionally, when the temperature value is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, the temperature inside the energy storage high-voltage box is within the normal temperature range, wherein the first temperature setting value is the minimum value of the normal temperature range, and the second temperature setting value is the maximum value of the normal temperature range. Exemplarily, the first temperature setting value is equal to -25°C, and the second temperature setting value is equal to 80°C.

[0063] When it is determined that the first air pressure sensor and the second air pressure sensor are working normally, and when it is determined through the first air pressure value, the second air pressure value and the temperature value that the temperature in the energy storage high-pressure box is normal and the air pressure is low, the air supply module is controlled to open to increase the air pressure in the energy storage high-pressure box.

[0064] S141: Correcting a first air pressure value acquired in real time by the first air pressure sensor to a first corrected air pressure value corresponding to a reference temperature, and correcting a second air pressure value acquired in real time by the second air pressure sensor to a second corrected air pressure value corresponding to the reference temperature.

[0065] When the air supply module is turned on to output the preset gas, the preset gas is converted from liquid to gas and absorbs a large amount of heat, which will affect the air pressure values ​​collected by the first and second air pressure sensors. Temperature compensation is required to correct the measured values ​​to the equivalent pressure values ​​at the reference temperature.

[0066] Based on the ideal gas law PV=nRT, the temperature compensation formula is derived, where V is volume, P is pressure, n is the total amount of preset gas (amount of substance), T is temperature, and R is the molar gas constant. Set the reference temperature T ref , the total amount of gas is n, the reference pressure P ref =nRT ref / V, measured pressure P measured =nRT current / V, where T current is the current temperature.

[0067] Correct the measured pressure value to the equivalent value P at the reference temperaturecorrected =P measured ·(T ref / T current ). The reference temperature is room temperature 298K.

[0068] Among them, after obtaining the real-time temperature value, a sliding average filter is performed to suppress instantaneous fluctuations and ensure that the reference temperature T ref And the current temperature T obtained in real time current is the Kelvin temperature.

[0069] S151: Adjust the opening size of the air supply module according to the first corrected air pressure value, the second corrected air pressure value and the target pressure value until it is determined that the absolute value of the difference between the first corrected air pressure value and the second corrected air pressure value is less than or equal to the preset difference, and the average value of the first corrected air pressure value and the second corrected air pressure value reaches the air pressure setting value, then control the air supply module to close.

[0070] Among them, the target pressure value is greater than or equal to the first air pressure threshold and less than or equal to the second air pressure threshold, and the air pressure setting value is greater than or equal to the first air pressure threshold and less than or equal to the second air pressure threshold. The target pressure value can be equal to the air pressure setting value. The opening size of the air supply module can be adjusted according to the first corrected air pressure value and the target pressure value to achieve closed-loop control. During the period when the air supply module is open, the first air pressure value and the second air pressure value are obtained in real time, and the first air pressure value is corrected to the first corrected air pressure value in real time, and the second air pressure value is corrected to the second corrected air pressure value in real time. When it is determined that the absolute value of the difference between the first corrected air pressure value and the second corrected air pressure value is less than or equal to the preset difference, and the average value of the first corrected air pressure value and the second corrected air pressure value reaches the air pressure setting value, it is determined that the air pressure value in the energy storage high-pressure box meets the requirement, the air supply module is controlled to be closed, and the preset gas is stopped from being output.

[0071] The amount of nitrogen released is dynamically matched to the air pressure inside the box (closed-loop feedback), ensuring the stability of the insulation medium density and adapting to altitude changes and long-term operation gas escape scenarios.

[0072] S161: Control the air supply module to open, and control the pressure relief valve to open to discharge the gas in the energy storage high-pressure box.

[0073] When the absolute value of the difference between the first and second pressure values ​​is less than or equal to a preset difference, both pressure sensors are determined to be operating normally and the collected pressure values ​​are relatively accurate. When the average of the first and second pressure values ​​exceeds the maximum value of the normal atmospheric pressure range at the reference temperature, i.e., the second pressure threshold, and the temperature value exceeds the maximum value of the normal temperature range, i.e., the second temperature setting value, a fire is determined to have occurred within the high-pressure energy storage tank, resulting in an abnormal temperature. Furthermore, the fire has caused a high pressure within the high-pressure energy storage tank. At this point, an alarm signal is transmitted to the master control (combiner cabinet), and an audible and visual alarm is activated. The pressure relief valve is then controlled to open for pressure relief, and the air supply module is controlled to open, outputting nitrogen to displace the oxygen within the high-pressure energy storage tank, pending manual intervention to close the tank. Exemplarily, the second pressure threshold is 1080 hPa.

[0074] Optionally, controlling the air supply module to open may further include: controlling the air supply module to close once every first set time period after opening, and each closing time period is equal to the second set time period.

[0075] Because the volume of preset gas in the air supply module is limited, if it remains open, the fire in the energy storage high-pressure box may not be extinguished even after all the preset gas has been discharged, causing the fire to continue to spread without subsequent human intervention. Therefore, the air supply module is set to open when the energy storage high-pressure box is in an abnormal temperature state, and close once every first set time, and each time it is closed, it remains closed for a second set time. This ensures that the air supply module intermittently sprays the preset gas, increasing the preset gas spray time and buying time for fire rescue.

[0076] S171: Control the energy storage high-voltage box to operate normally.

[0077] When the air pressure values ​​obtained by the two air pressure sensors are similar, and the pressure values ​​are within the normal range of atmospheric pressure at the reference temperature, 980hPa to 1080hPa, and the temperature values ​​are within the normal temperature range, such as -25℃ to 80℃, the energy storage high-voltage box is in normal working condition, and the operation light of the energy storage high-voltage box is always on.

[0078] S181: Output air pressure acquisition module fault signal.

[0079] When the pressure values ​​obtained by the two pressure sensors differ greatly and the temperature inside the energy storage high-pressure box is within the normal range, it indicates that the difference in the values ​​output by the two pressure sensors is not caused by temperature factors. It can be determined that one of the two pressure sensors is faulty and the collected pressure value is inaccurate and needs to be replaced or repaired.

[0080] The embodiment of the present invention also provides an energy storage high-voltage box, Figure 3 This is a structural diagram of an energy storage high-voltage box provided by an embodiment of the present invention. Figure 4A top view of an energy storage high-voltage box provided by an embodiment of the present invention, with reference to Figure 3 and Figure 4 Optionally, the energy storage high-pressure box includes: a sealed box body 10, an air pressure acquisition module, a temperature acquisition module, an air supply module, a pressure relief valve 11 and a battery management system. The air pressure acquisition module, the temperature acquisition module, the air supply module and the battery management system are all arranged in the sealed box body 10, and the pressure relief valve 11 is arranged on the operation panel of the sealed box body 10;

[0081] The air pressure acquisition module is used to obtain the air pressure value in the energy storage high-pressure box;

[0082] The temperature acquisition module is used to obtain the temperature value inside the energy storage high-voltage box;

[0083] The gas supply module is used to provide preset gas to the energy storage high-pressure box;

[0084] The pressure relief valve 11 is used to discharge the gas in the energy storage high-pressure box;

[0085] The battery management system is connected to the air pressure acquisition module, the temperature acquisition module, the air supply module and the pressure relief valve respectively, and the battery management system is used to execute the control method of the energy storage high-voltage box in any of the above embodiments.

[0086] Optionally, a gas replenishment module is provided on the rear side panel 19 of the energy storage high-voltage box. The gas replenishment module includes a tank body 121, a one-way valve 122, and an air outlet 123. The one-way valve 122 is provided between the tank body 121 and the air outlet 123. The one-way valve 122 only allows gas to flow in one direction. That is, the one-way valve 122 only allows the gas in the tank body 121 to be discharged through the air outlet 123, and does not allow external gas to enter the tank body 121. The one-way valve controls the preset gas flow direction, prevents the backflow of external contaminants, and ensures the purity of the insulating medium. The tank body 121 is fixed to the rear side panel 19 of the energy storage high-voltage box.

[0087] Optionally, a fan 13 is further provided in the energy storage high-voltage box. The fan 13 is fixed on the rear side plate 19 of the energy storage high-voltage box. Forced air cooling is performed by the fan to increase internal heat dissipation and compensate for the problem of high heat generation in high altitude areas.

[0088] Reasonable layout of various devices in the energy storage high-voltage box saves space in the energy storage high-voltage box and solves the problem that the energy storage high-voltage box is difficult to take into account the compactness of devices.

[0089] In this embodiment, the battery management system determines the state of the energy storage high-voltage box based on the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module provided in the energy storage high-voltage box, and executes different control strategies according to the state of the energy storage high-voltage box to solve the problems of deformation, leakage and insulation failure caused by gas escape of the energy storage high-voltage box in high-altitude areas. At the same time, a rapid response, fire extinguishing and explosion suppression control method is constructed to improve the service life of the energy storage high-voltage box in extreme environments.

[0090] Continue to refer Figure 3 and Figure 4 Optionally, the air pressure acquisition module includes a first air pressure sensor 141 and a second air pressure sensor 142. The two air pressure sensors are respectively located at opposite diagonals of the energy storage high-pressure box. The diagonals where the two air pressure sensors are located do not overlap with the diagonals where the air supply module is located, so that both air pressure sensors are located away from the air supply module. The difference in the air pressure values ​​obtained by the two air pressure sensors is used to determine whether the two air pressure sensors are functioning properly, thereby ensuring the accuracy of the air pressure values ​​collected by the air pressure sensors.

[0091] In an optional embodiment, the temperature acquisition module includes at least two temperature sensors 15 , and the temperature value of the temperature acquisition module may be the average value of the temperature values ​​acquired by all temperature sensors 15 to ensure the accuracy of the collected temperature inside the energy storage high-voltage box.

[0092] Figure 5 This is a structural diagram of another energy storage high-voltage box provided by an embodiment of the present invention, referring to Figure 5 Optionally, the high-voltage energy storage box further includes a cover plate 16 and a sealing rubber gasket 17. The sealing rubber gasket 17 is located between the cover plate 16 and the upper surface of the sealed box body 10. The sealing rubber gasket 17 is provided to seal the high-voltage energy storage box, thereby improving the sealing performance of the high-voltage energy storage box and preventing gas in the high-voltage energy storage box from escaping through the gap between the sealed box body 10 and the cover plate 16.

[0093] Figure 6 This is a partial enlarged view of an energy storage high-voltage box provided by an embodiment of the present invention. Figure 6 For Figure 5 A magnified view of area A in the middle. Figure 7 This is a structural diagram of an energy storage high-voltage box provided by an embodiment of the present invention after assembly, with reference to Figure 5 、 Figure 6 and Figure 7Optionally, a plurality of first openings 161 are provided at each frame position of the cover plate 16, and a screw 162 is provided at each first opening 161. A second opening 171 corresponding to the first opening 161 is provided at each frame position of the sealing rubber pad 17. A protrusion of the rivet nut 18 corresponding to the first opening 161 is provided at each frame on the upper surface of the sealed box body 10. The cover plate 16 is fixed to the sealed box body 10 by each screw 162.

[0094] For any first opening 161 , the vertical projection of the first opening 161 covers the vertical projection of the second opening 171 , and the vertical projection of the first opening 161 covers the vertical projection of the rivet nut 18 .

[0095] The sealed box body 10 of the entire energy storage high-voltage box is assembled with the sealing rubber gasket 17 and the cover plate 16. The sealed box body 10 adopts a full welding process, and the welding edge 101 is double-sealed with glue after welding. The sealing rubber gasket 17 is squeezed and sealed between the cover plate 16 and the sealed box body 10. The protrusion of the rivet nut 18 provides a stop feature for the sealing rubber gasket 17 (the sealing rubber gasket 17 stops after being compressed to the protrusion of the rivet nut 18) to avoid over-compression. The diameter of the second opening 171 is larger than the diameter of the rivet nut 18. The screws 162 on the cover plate 16 are combined screws, and the spacing between adjacent screws 162 is less than 100mm to ensure that the pressure of the cover plate 16 is uniform and stable. The front panel of the energy storage high-voltage box, that is, all components on the operation panel, meet IP67 requirements. After the whole machine is assembled, an air pressure test is performed through the opening of the pressure relief valve (sheet metal opening, not the pressure relief valve) to ensure that the whole machine meets the sealing requirements and there is no water vapor intrusion and condensation inside.

[0096] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0097] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A control method for an energy storage high-voltage box, characterized in that: The energy storage high-pressure box is provided with an air pressure acquisition module, a temperature acquisition module, an air supply module and a pressure relief valve, and the air supply module is used to provide a preset gas to the energy storage high-pressure box; the air pressure acquisition module includes a first air pressure sensor and a second air pressure sensor, and the first air pressure sensor and the second air pressure sensor are arranged at different positions in the energy storage high-pressure box; The control method of the energy storage high-voltage box includes: When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to a preset difference, the average value of the first air pressure value and the second air pressure value is less than or equal to a first air pressure threshold, and the temperature value obtained by the temperature acquisition module is greater than or equal to a first temperature setting value and less than or equal to a second temperature setting value, it is determined that the energy storage high-pressure box is in a pressure-deficient state, and the air supply module is controlled to open; Alternatively, when the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to a preset difference, the average value of the first air pressure value and the second air pressure value is greater than or equal to a second air pressure threshold, and the temperature value obtained by the temperature acquisition module is greater than a second temperature setting value, it is determined that the energy storage high-pressure box is in an abnormal temperature state, the air supply module is controlled to open, and the pressure relief valve is controlled to open to discharge the gas in the energy storage high-pressure box.

2. The control method of the energy storage high-voltage box according to claim 1, characterized in that: After determining that the energy storage high-pressure box is in a pressure-deficient state and controlling the air supply module to open, the method further includes: Correcting the first air pressure value acquired in real time by the first air pressure sensor to a first corrected air pressure value corresponding to a reference temperature, and correcting the second air pressure value acquired in real time by the second air pressure sensor to a second corrected air pressure value corresponding to the reference temperature; The opening size of the air supply module is adjusted according to the first corrected air pressure value, the second corrected air pressure value and the target pressure value until the absolute value of the difference between the first corrected air pressure value and the second corrected air pressure value is determined to be less than or equal to the preset difference, and the average value of the first corrected air pressure value and the second corrected air pressure value reaches the air pressure setting value, and the air supply module is controlled to be closed.

3. The control method of the energy storage high-voltage box according to claim 1, characterized in that: Determining that the energy storage high-pressure box is in an abnormal temperature state and controlling the air supply module to open includes: The air supply module is controlled to be closed once every first set time after being opened, and the closing time of each time is equal to the second set time.

4. The control method of the energy storage high-voltage box according to claim 1, characterized in that: The control method of the energy storage high-voltage box also includes: When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is less than or equal to the preset difference, the average value of the first air pressure value and the second air pressure value is greater than or equal to the first air pressure threshold and less than or equal to the second air pressure threshold, and the temperature value is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the energy storage high-pressure box is in a normal working state.

5. The control method of the energy storage high-voltage box according to claim 1, characterized in that: The control method of the energy storage high-voltage box also includes: When the absolute value of the difference between the first air pressure value obtained by the first air pressure sensor and the second air pressure value obtained by the second air pressure sensor is greater than a preset difference, and the temperature value obtained by the temperature acquisition module is greater than or equal to the first temperature setting value and less than or equal to the second temperature setting value, it is determined that the air pressure acquisition module is faulty and an air pressure acquisition module fault signal is output.

6. An energy storage high-voltage box, characterized in that: include: A sealed box, an air pressure acquisition module, a temperature acquisition module, an air supply module, a pressure relief valve, and a battery management system, wherein the air pressure acquisition module, the temperature acquisition module, the air supply module, and the battery management system are all arranged in the sealed box, and the pressure relief valve is arranged on the operation panel of the sealed box; The air pressure acquisition module is used to obtain the air pressure value in the energy storage high-pressure box; The temperature acquisition module is used to obtain the temperature value inside the energy storage high-voltage box; The gas supply module is used to provide preset gas to the energy storage high-pressure box; The pressure relief valve is used to discharge the gas in the energy storage high-pressure box; The battery management system is respectively connected to the air pressure acquisition module, the temperature acquisition module, the air supply module and the pressure relief valve, and the battery management system is used to execute the control method of the energy storage high-voltage box according to any one of claims 1 to 5.

7. The energy storage high-voltage box according to claim 6, characterized in that: It also includes a cover plate and a sealing rubber pad, wherein the sealing rubber pad is located between the cover plate and the upper surface of the sealing box body.

8. The energy storage high-voltage box according to claim 7, characterized in that: A plurality of first openings are provided at each frame position of the cover plate, a screw is provided at each first opening, a second opening corresponding to the first opening is provided at each frame position of the sealing rubber pad, a protrusion for a rivet nut corresponding to the first opening is provided at each frame position of the upper surface of the sealed box body, and the cover plate is fixed to the sealed box body by each of the screws; For any one of the first openings, the vertical projection of the first opening covers the vertical projection of the second opening, and the vertical projection of the first opening covers the vertical projection of the rivet nut.

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