Energy storage high-voltage box and control method thereof

Abstract

The control method comprises the steps that when it is determined that the energy storage high-pressure box is in a pressure shortage state according to an air pressure value obtained by an air pressure obtaining module and a temperature value obtained by a temperature obtaining module, an air supplementing module is controlled to be opened; or when it is determined that the temperature of the energy storage high-pressure box is in the abnormal state, the air supply module is controlled to be opened, and the pressure release valve is controlled to be opened so as to exhaust the air in the energy storage high-pressure box. According to the embodiment, the state of the energy storage high-voltage box is determined according to the air pressure value obtained by the air pressure obtaining module arranged in the energy storage high-voltage box and the temperature value obtained by the temperature obtaining module, and different control strategies are executed according to the state of the energy storage high-voltage box. The problems of deformation leakage and insulation failure caused by gas escape of the energy storage high-voltage box in a high-altitude area are solved, meanwhile, a control method for quick response, fire extinguishing and explosion suppression is constructed, and the service life of the energy storage high-voltage box in an extreme environment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and particularly to an energy storage high-voltage box and a control method therefor. Background Art

[0002] With the large-scale application of new energy storage systems in high-altitude areas (such as altitudes ≥ 3000 meters), the design of traditional container-type energy storage high-voltage boxes faces significant challenges. In a high-altitude environment, the atmospheric pressure decreases, the air density drops, and the diurnal temperature difference intensifies, resulting in the deterioration of the insulation and heat dissipation performance of the equipment. At the same time, the air insulation strength drops significantly, and the safety gap between electrodes needs to be increased by 20% - 30% to meet the requirements of the same withstand voltage level. Moreover, local discharges are likely to be triggered due to air pressure imbalance inside the sealing structure, further threatening the reliability of the system. Summary of the Invention

[0003] The present invention provides an energy storage high-voltage box and a control method therefor to solve the safety hazards existing in the energy storage high-voltage box in high-altitude areas.

[0004] According to one aspect of the present invention, a control method for an energy storage high-voltage box is provided. An air pressure acquisition module, a temperature acquisition module, a gas replenishment module, and a pressure relief valve are arranged in the energy storage high-voltage box, and the gas replenishment module is used to supply a preset gas to the energy storage high-voltage box;

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

[0006] When it is determined that the energy storage high-voltage box is in a pressure-deficient state according to the air pressure value acquired by the air pressure acquisition module and the temperature value acquired by the temperature acquisition module, control the gas replenishment module to open;

[0007] Alternatively, when it is determined that the energy storage high-voltage box is in a temperature abnormal state according to the air pressure value acquired by the air pressure acquisition module and the temperature value acquired by the temperature acquisition module, control the gas replenishment module to open and control the pressure relief valve to open to discharge the gas inside the energy storage high-voltage 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 inside the energy storage high-voltage box;

[0009] Determining that the energy storage high-voltage box is in a pressure-deficient state according to the air pressure value acquired by the air pressure acquisition module and the temperature value acquired by the temperature acquisition 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 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 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-voltage 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 inside the energy storage high-voltage box;

[0012] When it is determined that the energy storage high-voltage box is in a pressure-deficient state according to the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module, after controlling the air supplement module to open, it further includes:

[0013] Correct the first air pressure value obtained by the first air pressure sensor in real time to the first corrected air pressure value corresponding to the reference temperature, and correct the second air pressure value obtained by the second air pressure sensor in real time to the second corrected air pressure value corresponding to the reference temperature;

[0014] Adjust the opening degree of the air supplement 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 supplement module to close.

[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 inside the energy storage high-voltage box;

[0016] Determining that the energy storage high-voltage box is in a temperature abnormal state according to the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition 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 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 is greater than the second temperature setting value, it is determined that the energy storage high-voltage box is in a temperature abnormal state.

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

[0019] After the air supplement module is controlled to open, it is closed once every first set time period, and the duration of each closing is equal to the second set time period.

[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 inside the energy storage high-voltage box.

[0021] The control method of the energy storage high-voltage box further 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 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 first air pressure threshold and less than or equal to a second air pressure threshold, and the temperature value is greater than or equal to a first temperature set value and less than or equal to a second temperature set value, it is determined that the energy storage high-voltage 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 inside the energy storage high-voltage box;

[0024] The control method of the energy storage high-voltage box further 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 the preset difference, and the temperature value obtained by the temperature acquisition module is greater than or equal to the first temperature set value and less than or equal to the second temperature set value, it is determined that the air pressure acquisition module fails, and an air pressure acquisition module failure signal is output.

[0026] According to another aspect of the present invention, there is provided an energy storage high-voltage box, including: a sealed box body, an air pressure acquisition module, a temperature acquisition module, an air supplement module, a pressure relief valve, and a battery management system. The air pressure acquisition module, the temperature acquisition module, the air supplement module, and the battery management system are all arranged inside the sealed box body, and the pressure relief valve is arranged on the operation panel of the sealed box body;

[0027] The air pressure acquisition module is used to acquire the air pressure value inside the energy storage high-voltage box;

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

[0029] The air supplement module is used to supply a preset gas to the energy storage high-voltage box;

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

[0031] The battery management system is respectively connected to the air pressure acquisition module, the temperature acquisition module, the air supplement 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 described in the previous 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 border position of the cover plate, screws are provided at each first opening, second openings corresponding to the first openings are provided at each border position of the sealing rubber pad, and raised riveting nuts corresponding to the first openings are provided at each border of the upper surface of the sealed box body. The cover plate is fixed to the sealed box body through the respective 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 riveting nut.

[0035] In the technical solution of the embodiment of the present invention, when it is determined that the energy storage high-voltage box is in a pressure-deficient state according to the air pressure value and the temperature value in the energy storage high-voltage box, that is, when the energy storage high-voltage box is in a high-altitude area and the air pressure in the box decreases due to a small amount of gas escaping after long-term operation, the air supplement module is controlled to open to supplement the preset gas into the energy storage high-voltage box, so as to increase the air pressure value in the energy storage high-voltage box, offset the negative pressure caused by high altitude and low air pressure or gas escape, and ensure the sealing reliability. When it is determined that the temperature in the energy storage high-voltage box is abnormal, it is judged that a fire may occur in the box, and the pressure relief valve is controlled to open to achieve rapid pressure relief and avoid explosion, and at the same time, the preset gas is released to dilute the oxygen concentration to solve the secondary risk of oxygen-assisted combustion after pressure relief. In this embodiment, according to the air pressure value obtained by the air pressure acquisition module arranged in the energy storage high-voltage box and the temperature value obtained by the temperature acquisition module, the state of the energy storage high-voltage box is determined, and different control strategies are executed according to the state of the energy storage high-voltage box, so as 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, and at the same time construct a control method with rapid response, fire extinguishing and explosion suppression, and improve the service life of the energy storage high-voltage box in extreme environments.

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

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

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

[0039] Figure 2 A flowchart of another control method for 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 by an embodiment of the present invention;

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

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

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

[0044] Figure 7 A schematic structural diagram of an energy storage high-voltage box after assembly provided by an embodiment of the present invention. Detailed implementation manners

[0045] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

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

[0047] A pressure acquisition module, a temperature acquisition module, a gas replenishment module and a pressure relief valve are arranged in the energy storage high-voltage box. The gas replenishment module is used to supply a preset gas to the energy storage high-voltage box. Figure 1 The flowchart of a control method for an energy storage high-voltage box provided by an embodiment of the present invention is referred to Figure 1 , and the method includes:

[0048] S110: Obtain the air pressure value inside the energy storage high-voltage box through the air pressure acquisition module, and obtain the temperature value inside the energy storage high-voltage box through the temperature acquisition module. And S120 or S130 is executed after S110.

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

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

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

[0052] In an alternative embodiment, when the air pressure value in the energy storage high-voltage box is less than a certain set value and the temperature is within the set normal temperature range, it is determined that the energy storage high-voltage box is in a pressure-deficient state, and the air replenishment module is controlled to open to maintain a positive pressure inside the box by injecting nitrogen, offsetting the negative pressure caused by low air pressure at high altitudes or gas leakage, and ensuring sealing reliability. The insulation strength of nitrogen is approximately 1.5 times that of air, which can improve the insulation of the energy storage high-voltage box, compensate for the decrease in air density, increase the arc breakdown threshold, increase the safety gap or derate the capacity.

[0053] S130: When it is determined that the energy storage high-voltage box is in a temperature abnormal state according to the air pressure value obtained by the air pressure acquisition module and the temperature value obtained by the temperature acquisition module, control the air replenishment module to open and control the pressure relief valve to open to discharge the gas inside the energy storage high-voltage box.

[0054] The temperature abnormal state is the state where a fire occurs in the energy storage high-voltage box. In an alternative embodiment, when the temperature value inside the energy storage high-voltage box is greater than a temperature set value, due to the abnormal high temperature inside the energy storage high-voltage box, the air pressure inside the box increases until the air pressure value is greater than a set value, such as the maximum value of the normal range of atmospheric pressure at normal temperature, it is determined that the energy storage high-voltage box is in a temperature abnormal state. At this time, a fire is likely to occur inside the energy storage high-voltage box. Control the pressure relief valve to open to quickly relieve pressure and avoid explosion when a fire occurs. At the same time, control the air replenishment module to open and synchronously release nitrogen to dilute the oxygen concentration, solving the secondary risk of oxygen-assisted combustion after pressure relief. When a fire occurs, it is triggered intelligently by electric control, and the response time is less than 50 ms, which is significantly better than mechanical pressure relief devices.

[0055] Optionally, when it is determined that the energy storage high-voltage box is in a temperature abnormal state, an audible and visual alarm is given through the busbar cabinet to remind the operators.

[0056] In the technical solution of the embodiment of the present invention, when it is determined that the energy storage high-voltage box is in a pressure-deficient state according to the air pressure value and temperature value inside the energy storage high-voltage box, that is, when the air pressure inside the energy storage high-voltage box decreases due to the box being in a high-altitude area and a small amount of gas escaping after long-term operation, the air supplement module is controlled to open to supplement the preset gas into the energy storage high-voltage box, so as to increase the air pressure value inside the energy storage high-voltage box, offset the negative pressure caused by high altitude and low air pressure or gas escape, and ensure the sealing reliability. When it is determined that the temperature inside the energy storage high-voltage 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 and avoid explosion, and at the same time, the preset gas is released to dilute the oxygen concentration to solve the secondary risk of oxygen-assisted combustion after pressure relief. In this embodiment, according to the air pressure value obtained by the air pressure acquisition module arranged inside the energy storage high-voltage box and the temperature value obtained by the temperature acquisition module, the state of the energy storage high-voltage box is determined, and different control strategies are executed according to the state of the energy storage high-voltage box, so as 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, and at the same time construct a control method with rapid response, fire extinguishing and explosion suppression, and improve 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 inside the energy storage high-voltage box. Figure 2 It is a flowchart of another control method for an energy storage high-voltage box provided by an embodiment of the present invention. Refer to Figure 2 , this method includes:

[0058] S111: Obtain the first air pressure value inside the energy storage high-voltage box through the first air pressure sensor, obtain the second air pressure value inside the energy storage high-voltage box through the second air pressure sensor, and obtain the temperature value inside the energy storage high-voltage box through the temperature acquisition module.

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

[0060] S121: Determine the state of the energy storage high-voltage box based on the first air pressure value, the second air pressure value, and the temperature value. If the energy storage high-voltage box is in the under-pressure state a, then sequentially execute S131, S141, and S151. If the energy storage high-voltage box is in the temperature anomaly state b, then execute S161. If the energy storage high-voltage box is in the normal working state c, execute S171. If the energy storage high-voltage box is in the air pressure acquisition module failure state d, then 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-voltage box is in the under-pressure 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-voltage box is in the temperature anomaly 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 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-voltage box is in the 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 fails, and it is determined that the energy storage high-voltage box is in the air pressure acquisition module failure state d. Among them, 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 replenishment 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 a 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, avoiding the situation where when a single air pressure sensor is set, a malfunction of the air pressure sensor leads to inaccurate air pressure values collected in the energy storage high-voltage box, resulting in misoperation of controlling the energy storage high-voltage box. Optionally, the preset difference can be equal to 10 hPa, which can be specifically determined according to the detection accuracy of the first air pressure sensor and the second air pressure sensor, and no specific limitation is made. The first air pressure threshold is the minimum value of the normal range of the atmospheric pressure at the reference temperature, such as 980 hPa. When the average value of the air pressure values obtained by the two air pressure sensors is less than or equal to 980 hPa, it indicates that the air pressure in the energy storage high-voltage box is on the low side, deviating from the normal range of the 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 in the energy storage high-voltage box is within the normal range of temperature. Among them, the first temperature setting value is the minimum value of the normal range of temperature, and the second temperature setting value is the maximum value of the normal range of temperature. 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 that the temperature in the energy storage high-voltage box is normal and the air pressure is low through the first air pressure value, the second air pressure value and the temperature value, the air supplement module is controlled to open to increase the air pressure in the energy storage high-voltage box.

[0064] S141: Correct the first air pressure value obtained by the first air pressure sensor in real time to the first corrected air pressure value corresponding to the reference temperature, and correct the second air pressure value obtained by the second air pressure sensor in real time to the second corrected air pressure value corresponding to the reference temperature.

[0065] When the air supplement module opens 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 air pressure sensor and the second air pressure sensor. Temperature compensation is required to correct the measured value to the equivalent pressure value at the reference temperature.

[0066] Based on the ideal gas law PV = nRT, derive the temperature compensation formula, where V is volume, P is pressure, n is the total amount (amount of substance) of the preset gas, T is temperature, and R is the molar gas constant. Set the reference temperature T ref , the total amount of gas is n, and the reference pressure P ref = nRT ref / V, the 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 ). Among them, the reference temperature is taken as the normal temperature of 298K.

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

[0069] S151: Adjust the opening degree of the air supplement 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 when the average value of the first corrected air pressure value and the second corrected air pressure value reaches the air pressure set value, control the air supplement 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 set 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 set value. The opening degree of the air supplement module can be adjusted according to the first corrected air pressure value and the target pressure value to achieve closed-loop control. During the opening of the air supplement module, 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 set value, it is determined that the air pressure value in the energy storage high-pressure box meets the requirements, control the air supplement module to close, and stop outputting the preset gas again.

[0071] The nitrogen release amount is dynamically matched with the air pressure in the box (closed-loop feedback) to ensure the stability of the insulation medium density and adapt to the altitude change and the long-term operation gas escape scenario.

[0072] S161: Control the air supplement 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 air pressure value and the second air pressure value is less than or equal to a preset difference, it is determined that both air pressure sensors are working properly and the collected air pressure values are relatively accurate. When the average value of the first air pressure value and the second air pressure value exceeds the maximum value of the normal range of the atmospheric pressure at the reference temperature, that is, the second air pressure threshold, and the temperature value is greater than the maximum value of the normal range of the temperature, that is, the second temperature setting value, it is determined that a fire has occurred in the energy storage high-voltage box, resulting in abnormal temperature, and due to the fire, the air pressure in the energy storage high-voltage box is relatively high. At this time, an alarm signal is transmitted to the master control (busbar cabinet) and an audible and visual alarm is carried out. Synchronously, the pressure relief valve is controlled to open for pressure relief, and the air replenishment module is controlled to open to output nitrogen to squeeze the oxygen inside the energy storage high-voltage box, and wait for manual intervention to close. Exemplarily, the second air pressure threshold is equal to 1080 hPa.

[0074] Optionally, controlling the air replenishment module to open may further include: after controlling the air replenishment module to open, it is closed once every first set duration, and each closing duration is equal to the second set duration.

[0075] Due to the limited volume of the preset gas in the air replenishment module, if it is always in the open state, it may cause the preset gas to be completely output, but the fire in the energy storage high-voltage box is still not extinguished, resulting in the continuous spread of the fire in the energy storage high-voltage box without subsequent manual intervention. Therefore, the air replenishment module is set to open when the energy storage high-voltage box is in an abnormal temperature state, and it is closed once every first set duration, and each closing lasts for the second set duration, so as to ensure that the air replenishment module intermittently sprays the preset gas, increase the spraying time of the preset gas, and win time for fire rescue.

[0076] S171: Control the normal operation of the energy storage high-voltage box.

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

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

[0079] When the air pressure values obtained by the two air pressure sensors differ greatly and the temperature inside the energy storage high-voltage box is within the normal range, it indicates that the values output by the two air pressure sensors are different due to non-temperature factors. It can be determined that one of the two air pressure sensors is faulty and the collected air pressure value is inaccurate, and it needs to be replaced or repaired.

[0080] The embodiment of the present invention also provides an energy storage high-voltage box. Figure 3 It is a schematic structural diagram of an energy storage high-voltage box provided by the embodiment of the present invention. Figure 4The top view of an energy storage high-voltage box provided by an embodiment of the present invention is referred to Figure 3 and Figure 4 Optionally, the energy storage high-voltage box includes: a sealed box body 10, a gas pressure acquisition module, a temperature acquisition module, a gas replenishment module, a pressure relief valve 11, and a battery management system. The gas pressure acquisition module, the temperature acquisition module, the gas replenishment module, and the battery management system are all arranged inside 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 gas pressure acquisition module is used to acquire the gas pressure value inside the energy storage high-voltage box;

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

[0083] The gas replenishment module is used to supply a preset gas to the energy storage high-voltage box;

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

[0085] The battery management system is respectively connected to the gas pressure acquisition module, the temperature acquisition module, the gas replenishment module, and the pressure relief valve. 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, the gas replenishment module is arranged at the rear side plate 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 arranged 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 inside the tank body 121 to be output through the air outlet 123, and does not allow external gas to enter the tank body 121. The one-way valve controls the flow direction of the preset gas, avoids the backflow of external pollutants, and ensures the purity of the insulating medium. The tank body 121 is fixed on the rear side plate 19 of the energy storage high-voltage box.

[0087] Optionally, a fan 13 is also arranged inside 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 carried out through the fan to increase internal heat dissipation and compensate for the problem of large heat generation in high-altitude areas.

[0088] Reasonably arrange each device in the energy storage high-voltage box, save the space of the energy storage high-voltage box, and solve the problem that it is difficult for the energy storage high-voltage box to balance the compactness of the devices.

[0089] In this embodiment, the battery management system determines the state of the energy storage high-voltage box according to the air pressure value obtained by the air pressure acquisition module disposed in the energy storage high-voltage box and the temperature value obtained by the temperature acquisition module, 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 control method with rapid response, fire extinguishing and explosion suppression is constructed to improve the service life of the energy storage high-voltage box in extreme environments.

[0090] Continue to refer to 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 disposed at both ends of the diagonal line of the energy storage high-voltage box, and the diagonal where the two air pressure sensors are located does not overlap with the diagonal where the air replenishment module is located, so that both air pressure sensors are disposed at positions far from the air replenishment module. The normal operation of the two air pressure sensors is determined according to the difference condition of the air pressure values obtained by the two air pressure sensors, and the accuracy of the air pressure value collected by the air pressure sensor is ensured.

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

[0092] Figure 5 FIG. is a schematic structural diagram of another energy storage high-voltage box provided by an embodiment of the present invention. Refer to Figure 5 Optionally, the energy storage high-voltage 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 sealing box body 10. The sealing rubber gasket 17 is provided to seal the energy storage high-voltage box, improve the sealing performance of the energy storage high-voltage box, and prevent the gas in the energy storage high-voltage box from escaping through the gap between the sealing box body 10 and the cover plate 16.

[0093] Figure 6 FIG. 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 the enlarged view of area A in Figure 7 FIG. is a schematic structural diagram of an energy storage high-voltage box after assembly provided by an embodiment of the present invention. Refer to Figure 5 、 Figure 6 and Figure 7, Optionally, a plurality of first openings 161 are provided at each border position of the cover plate 16, screws 162 are provided at each of the first openings 161, a second opening 171 corresponding to the first opening 161 is provided at each border position of the sealing rubber gasket 17, a protrusion of a rivet nut 18 corresponding to the first opening 161 is provided at each border of the upper surface of the sealed box body 10, and the cover plate 16 is fixed to the sealed box body 10 by the respective screws 162;

[0094] For any one of the first openings 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 whole machine 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. For the welding edge 101, double sealing protection is adopted by caulking after welding. The cover plate 16 and the sealed box body 10 are sealed by extrusion of the sealing rubber gasket 17. Among them, 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 adopt combined screws, and the distance between adjacent screws 162 is less than 100 mm to ensure that the pressing force of the cover plate 16 is uniform and stable. All the devices on the front panel of the energy storage high-voltage box, that is, the operation panel, meet the IP67 requirements. After the whole machine is assembled, a gas pressure test is carried out 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 or condensation inside.

[0096] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the present invention can be executed 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, and no limitation is made herein.

[0097] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for an energy storage high-voltage box, characterized in that, A gas pressure acquisition module, a temperature acquisition module, a gas replenishment module and a pressure relief valve are arranged in the energy storage high-voltage box, and the gas replenishment module is used to supply a preset gas to the energy storage high-voltage box; The control method of the energy storage high-voltage box includes: When it is determined that the energy storage high-voltage box is in a pressure-deficient state according to the gas pressure value acquired by the gas pressure acquisition module and the temperature value acquired by the temperature acquisition module, control the gas replenishment module to open; Alternatively, when it is determined that the energy storage high-voltage box is in a temperature abnormal state according to the gas pressure value acquired by the gas pressure acquisition module and the temperature value acquired by the temperature acquisition module, control the gas replenishment module to open and control the pressure relief valve to open to discharge the gas in the energy storage high-voltage box.

2. The control method of the energy storage high-voltage box according to claim 1, characterized in that The gas pressure acquisition module includes a first gas pressure sensor and a second gas pressure sensor, and the first gas pressure sensor and the second gas pressure sensor are arranged at different positions in the energy storage high-voltage box; Determining that the energy storage high-voltage box is in a pressure-deficient state according to the gas pressure value acquired by the gas pressure acquisition module and the temperature value acquired by the temperature acquisition module includes: When the absolute value of the difference between the first gas pressure value acquired by the first gas pressure sensor and the second gas pressure value acquired by the second gas pressure sensor is less than or equal to a preset difference, the average value of the first gas pressure value and the second gas pressure value is less than or equal to a first gas pressure threshold, and the temperature value 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-voltage box is in a pressure-deficient state.

3. The control method of the energy storage high-voltage box according to claim 1 or 2, characterized in that, The gas pressure acquisition module includes a first gas pressure sensor and a second gas pressure sensor, and the first gas pressure sensor and the second gas pressure sensor are arranged at different positions in the energy storage high-voltage box; After controlling the gas replenishment module to open when it is determined that the energy storage high-voltage box is in a pressure-deficient state according to the gas pressure value acquired by the gas pressure acquisition module and the temperature value acquired by the temperature acquisition module, the following steps are further included: Correct the first gas pressure value acquired by the first gas pressure sensor in real time to the first corrected gas pressure value corresponding to the reference temperature, and correct the second gas pressure value acquired by the second gas pressure sensor in real time to the second corrected gas pressure value corresponding to the reference temperature; Adjust the opening degree of the gas replenishment module according to the first corrected gas pressure value, the second corrected gas pressure value and the target pressure value until it is determined that the absolute value of the difference between the first corrected gas pressure value and the second corrected gas pressure value is less than or equal to the preset difference, and the average value of the first corrected gas pressure value and the second corrected gas pressure value reaches the gas pressure setting value, and then control the gas replenishment module to close.

4. The control method of the energy storage high-voltage box according to claim 1, characterized in that The gas pressure acquisition module includes a first gas pressure sensor and a second gas pressure sensor, and the first gas pressure sensor and the second gas pressure sensor are arranged at different positions in the energy storage high-voltage box; Determining that the energy storage high-voltage box is in a temperature abnormal state according to the gas pressure value acquired by the gas pressure acquisition module and the temperature value acquired by the temperature acquisition module 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 greater than or equal to a second air pressure threshold, and the temperature value is greater than a second temperature set value, it is determined that the energy storage high-voltage box is in an abnormal temperature state.

5. The control method of the energy storage high-voltage box according to claim 1 or 4, characterized in that, When it is determined that the energy storage high-voltage 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, controlling the opening of the air supplement module includes: After controlling the air supplement module to open, it is closed once every first set time interval, and the closing time of each time is equal to the second set time.

6. The control method of the energy storage high-voltage box according to claim 1, wherein, 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 inside the energy storage high-voltage box. The control method of the energy storage high-voltage box further 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 greater than or equal to a first air pressure threshold and less than or equal to a second air pressure threshold, and the temperature value is greater than or equal to a first temperature set value and less than or equal to a second temperature set value, it is determined that the energy storage high-voltage box is in a normal working state.

7. The control method of the energy storage high-voltage box according to claim 1, characterized in that, 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 inside the energy storage high-voltage box; The control method of the energy storage high-voltage box further 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 a first temperature set value and less than or equal to a second temperature set value, it is determined that the air pressure acquisition module fails, and an air pressure acquisition module failure signal is output.

8. A high-voltage energy storage box, characterized in that, Includes: A sealed box body, an air pressure acquisition module, a temperature acquisition module, an air supplement module, a pressure relief valve, and a battery management system. The air pressure acquisition module, the temperature acquisition module, the air supplement module, and the battery management system are all arranged inside the sealed box body, and the pressure relief valve is arranged on the operation panel of the sealed box body; The air pressure acquisition module is used to acquire the air pressure value inside the energy storage high-voltage box; The temperature acquisition module is used to acquire the temperature value inside the energy storage high-voltage box; The air supplement module is used to provide a preset gas to the energy storage high-voltage box; The pressure relief valve is used to discharge the gas inside the energy storage high-voltage box; The battery management system is respectively connected to the air pressure acquisition module, the temperature acquisition module, the air supplement 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 1-7.

9. The energy storage high-voltage box according to claim 8, wherein, It 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.

10. The energy storage high-voltage box according to claim 9, characterized in that, A plurality of first openings are provided at the positions of the respective borders of the cover plate, screws are provided at each of the first openings, a plurality of second openings corresponding to the first openings are provided at the positions of the respective borders of the sealing rubber pad, and raised rivet nuts corresponding to the first openings are provided at the positions of the respective borders of the upper surface of the sealed box body. The cover plate is fixed to the sealed box body by the respective 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.

Images