Energy storage system, leakage detection method and device and readable storage medium

Abstract

The invention provides an energy storage system, a leakage detection method and device and a readable storage medium, the energy storage system comprises a controller and at least one battery cabinet, and the battery cabinet is connected with a cooling system and a gas protection system. And a humidity sensor is arranged in the gas protection system and is connected with the controller. The controller is used for obtaining a first humidity value in the gas protection system through the humidity sensor and determining that cooling liquid in the cooling system leaks under the condition that the first humidity value is larger than or equal to a humidity threshold value. The humidity value in the gas protection system is detected through the humidity sensor, the leakage of the cooling liquid is determined under the condition that the humidity value in the gas protection system is greater than or equal to the humidity threshold value, the condition of slight leakage of the cooling liquid can be detected, and the detection precision is relatively high.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system, a leakage detection method, a device and a readable storage medium. Background Art

[0002] An energy storage system using batteries as carriers usually includes one or more battery cabinets, each of which includes a certain number of cells. The battery cabinet is usually equipped with a cooling system, which is used to cool the cells in the battery cabinet to protect the cells in the battery cabinet.

[0003] Among them, when the coolant in the cooling system leaks, the leaked coolant may cause corrosion, short circuit, etc. inside the battery cabinet. Therefore, it is necessary to detect whether the coolant is leaking in real time during the use of the battery cabinet, so as to take timely measures to solve the leakage problem when the coolant leaks. Summary of the invention

[0004] The embodiments of the present application provide an energy storage system, a leakage detection method, a device and a readable storage medium, which can detect slight leakage of coolant with relatively high detection accuracy, which is beneficial to improving the safety of the battery cabinet.

[0005] In a first aspect, an energy storage system is provided, comprising: a controller and at least one battery cabinet, wherein the battery cabinet is connected to a cooling system and a gas protection system;

[0006] A humidity sensor is provided in the gas protection system, and the humidity sensor is connected to the controller;

[0007] The controller is used to obtain a first humidity value in the gas protection system through the humidity sensor, and determine that the coolant in the cooling system is leaking when the first humidity value is greater than or equal to a humidity threshold.

[0008] In the embodiment of the present application, the humidity value in the cooling system of the battery cabinet is used to detect whether the coolant is leaking, and the situation of slight leakage of the coolant can be detected with relatively high detection accuracy. When the coolant leaks slightly, it can be accurately detected whether the coolant is leaking, so that measures can be taken to solve the leakage problem when the coolant leaks slightly, thereby reducing the probability of corrosion and short circuit problems in the battery cabinet due to coolant leakage, thereby reducing the risk of fire and explosion in the battery cabinet, and improving the safety and reliability of the battery cabinet.

[0009] In one embodiment, the gas protection system includes a gas circulation device, the air inlet of the battery cabinet is connected to the air outlet of the gas circulation device through a gas circulation pipeline, and the exhaust port of the battery cabinet is connected to the air inlet of the gas circulation device through a gas circulation pipeline.

[0010] In an embodiment of the present application, the gas protection system includes a gas circulation device, which can enable the gas in the gas protection system to circulate within the gas protection system, so that the gas composition at various positions in the gas protection system is close to or remains consistent, so that various sensors in the energy storage system can be set outside the battery cabinet, thereby reducing the electromagnetic interference of the battery cabinet to various sensors.

[0011] In one embodiment, the gas protection system also includes a three-way valve, which is arranged between the battery cabinet and the gas circulation device, and the three-way valve is arranged between the battery cabinet and the gas circulation device. The first end of the three-way valve is connected to the exhaust port of the battery cabinet through a gas circulation pipeline, the second end is connected to the air inlet of the gas circulation device through a gas circulation pipeline, and the third end is connected to the external environment.

[0012] In the embodiment of the present application, the gas protection system includes a three-way valve, through which the gas protection system and the external environment can be connected, thereby facilitating the replacement of the gas in the gas protection system.

[0013] In one embodiment, the gas protection system further includes a gas supply device, and the gas supply device is connected to the gas inlet of the gas circulation device through a gas supply valve.

[0014] In the embodiment of the present application, the gas protection system includes a gas replenishing device, through which the gas protection system can be replenished with gas, so as to facilitate the gas protection system to maintain stable pressure.

[0015] In one embodiment, a humidity regulating device is provided in the gas protection system, and the humidity regulating device is connected to the controller; the controller is also used to control the humidity regulating device to regulate the humidity of the gas protection system when a coolant leakage is determined, so that the humidity value in the gas protection system is less than the humidity threshold.

[0016] In the embodiment of the present application, after determining that the coolant has slightly leaked, the controller can control the humidity adjustment device to adjust the humidity of the gas protection system, reduce the moisture in the battery cabinet and protect the battery cabinet. The humidity adjustment can enable the battery cabinet to continue to operate when the coolant has slightly leaked, thereby reducing the probability of the battery cabinet being shut down for maintenance.

[0017] In one embodiment, there are multiple humidity sensors; the controller is used to determine a target humidity sensor that is not faulty from the multiple humidity sensors, and obtain the first humidity value from the humidity values ​​collected by the target humidity sensor.

[0018] In an embodiment of the present application, multiple humidity sensors are arranged in the gas protection system. In the process of determining the first humidity value in the gas protection system, the first humidity value is obtained from the humidity values ​​collected by the humidity sensors that have not failed. This can improve the reliability of the first humidity value, thereby reducing the probability of misjudgment of leakage detection and improving the reliability of the detection results.

[0019] In one embodiment, the cooling system includes a heat exchange device, a liquid circulation device and an expansion device. The heat exchange device, the liquid circulation device and the battery cabinet are connected in sequence through a liquid circulation pipeline, and the expansion device is connected in parallel with the liquid circulation device.

[0020] In one embodiment, a plurality of liquid level sensors are provided in the expansion device, and the liquid level sensors are connected to the controller. The controller is also used to determine the coolant leakage according to the detection values ​​of the liquid level sensors.

[0021] In an embodiment of the present application, a plurality of liquid level sensors are arranged in the expansion device, and the controller can detect whether the coolant is leaking according to the detection values ​​of the plurality of liquid level sensors, thereby improving the reliability of the detection values ​​and thus improving the accuracy of leakage detection.

[0022] In a second aspect, a leakage detection method is provided, the method comprising:

[0023] Obtaining a first humidity value in a gas protection system of a battery cabinet;

[0024] When the first humidity value is greater than or equal to a humidity threshold, it is determined that there is a coolant leak in the cooling system of the battery cabinet.

[0025] In the embodiment of the present application, the humidity value in the cooling system of the battery cabinet is used to detect whether the coolant is leaking, and the situation of slight leakage of the coolant can be detected with relatively high detection accuracy. When the coolant leaks slightly, it can be accurately detected whether the coolant is leaking, so that measures can be taken to solve the leakage problem when the coolant leaks slightly, thereby reducing the probability of corrosion and short circuit problems in the battery cabinet due to coolant leakage, thereby reducing the risk of fire and explosion in the battery cabinet, and improving the safety and reliability of the battery cabinet.

[0026] In one embodiment, the method further includes: in the case of determining that the coolant is leaking, controlling the gas protection system to adjust the humidity so that the humidity value in the gas protection system is less than the humidity threshold.

[0027] In the embodiment of the present application, after determining that the coolant has a slight leak, the gas protection system can be controlled to adjust the humidity to reduce the moisture in the battery cabinet to protect the battery cabinet. The humidity adjustment can enable the battery cabinet to continue to operate when the coolant has a slight leak, thereby reducing the probability of the battery cabinet being shut down for maintenance.

[0028] In one embodiment, a plurality of humidity sensors are provided in the gas protection system, and obtaining a first humidity value in the gas protection system of the battery cabinet includes:

[0029] determining a target humidity sensor that is not faulty from among the plurality of humidity sensors;

[0030] The first humidity value is obtained from the humidity values ​​collected by the target humidity sensor.

[0031] In an embodiment of the present application, multiple humidity sensors are arranged in the gas protection system. In the process of determining the first humidity value in the gas protection system, the first humidity value is obtained from the humidity values ​​collected by the humidity sensors that have not failed. This can improve the reliability of the first humidity value, thereby reducing the probability of misjudgment of leakage detection and improving the reliability of the detection results.

[0032] In one embodiment, a liquid level sensor is provided in the expansion device of the cooling system, and the method further includes: determining the amount of liquid level drop in the expansion device during a current calculation cycle based on a detection value of the liquid level sensor, each calculation cycle including at least one sampling cycle of the liquid level sensor; and determining whether a coolant leak occurs based on the amount of liquid level drop.

[0033] In the embodiment of the present application, the amount of liquid level drop in the expansion device during the current calculation cycle can be determined by the detection value of the liquid level sensor in the expansion device, and whether the coolant is leaking can be determined based on the amount of liquid level drop. Since the liquid level in the expansion device changes rapidly when a relatively serious leak of the coolant occurs, it is possible to quickly detect whether the coolant is leaking based on the amount of liquid level drop when a relatively serious leak of the coolant occurs, thereby enabling timely detection of a relatively serious leak of the coolant.

[0034] In one embodiment, determining that the coolant has leaked according to the amount of liquid level drop includes:

[0035] According to the liquid level drop, it is determined from a plurality of leakage levels that the coolant leaks at a target leakage level, wherein the plurality of leakage levels correspond to different leakage flow rates, and a higher leakage level means a greater leakage flow rate.

[0036] In the embodiment of the present application, leakage conditions other than minor leakage are classified into different leakage levels. During the leakage detection process, whether a leakage of a certain leakage level occurs in the coolant is determined by the amount of drop in the liquid level in the expansion device during the current calculation cycle. This enables precise detection of leakage conditions, making it easier for staff to take corresponding measures for leakages of different leakage levels, thereby improving the maintenance efficiency of the battery cabinet.

[0037] In one embodiment, determining, according to the liquid level drop, that the coolant has leaked a target leakage level from a plurality of leakage levels, comprises:

[0038] Determining a decreasing rate of the liquid level in the expansion device during the current calculation cycle according to the liquid level decreasing amount;

[0039] When the decreasing rate is greater than or equal to a rate threshold, it is determined that the coolant leaks at the target leakage level, and the rate threshold corresponds to the target leakage level.

[0040] In the embodiment of the present application, whether a coolant leaks at a certain leakage level is determined based on the rate of decrease of the liquid level in the expansion device. Since the leakage flow of the coolant directly affects the rate of decrease of the liquid level in the expansion device, whether the coolant leaks can be detected more accurately based on the rate of decrease of the liquid level in the expansion device.

[0041] In one embodiment, determining, according to the liquid level drop, that the coolant has leaked a target leakage level from a plurality of leakage levels, comprises:

[0042] When the liquid level drop is greater than or equal to a drop threshold, it is determined that the coolant leaks at the target leakage level, and the drop threshold corresponds to the target leakage level.

[0043] In an embodiment of the present application, whether a coolant leaks at a certain leakage level is determined based on the amount of drop in the liquid level in the expansion device during the current calculation cycle. Whether the coolant leaks can be directly determined based on the change in the liquid level in the expansion device, thereby quickly detecting whether the coolant leaks.

[0044] In one embodiment, determining the liquid level drop amount of the liquid level in the expansion device in the current calculation cycle according to the detection value of the liquid level sensor includes:

[0045] The drop amount of the liquid level in the expansion device corresponding to each leakage level within a calculation period is determined according to the detection value of the liquid level sensor. Different leakage levels correspond to different calculation periods, and the lower the leakage level, the longer the calculation period.

[0046] In the embodiment of the present application, a shorter calculation cycle can be set for leakage of high leakage level to improve the response speed and quickly detect leakage of high leakage level. A longer calculation cycle can be set for leakage of low leakage level to reduce the detection frequency and the amount of calculation, thereby reducing power consumption.

[0047] In one embodiment, the method further includes: when it is determined that the coolant leaks at the target leakage level, outputting an alarm signal corresponding to the target leakage level.

[0048] In an embodiment of the present application, different alarm signals are output for leaks of different leakage levels, and the staff can be informed of the coolant leakage through different alarm signals, so that the staff can take different measures according to different leakage situations.

[0049] In one embodiment, there are multiple liquid level sensors, and determining the liquid level drop amount of the liquid level in the expansion device in the current calculation cycle according to the detection value of the liquid level sensor includes:

[0050] determining a target liquid level sensor that has not failed from among the plurality of liquid level sensors;

[0051] The liquid level drop amount is determined according to the detection value of the target liquid level sensor.

[0052] In an embodiment of the present application, a plurality of liquid level sensors are arranged in the expansion device, and whether the coolant is leaking can be detected based on the detection value of a liquid level sensor that is not faulty among the plurality of liquid level sensors, thereby improving the reliability of the detection value and thus improving the accuracy of leakage detection.

[0053] In a third aspect, a leakage detection device is provided, the device comprising:

[0054] An acquisition module, used to acquire a first humidity value in a gas protection system of a battery cabinet;

[0055] A determination module is used to determine that there is a coolant leak in the cooling system of the battery cabinet when the first humidity value is greater than or equal to a humidity threshold.

[0056] In one embodiment, the device further includes a control module for controlling the gas protection system to adjust the humidity when a coolant leak is determined, so that the humidity value in the gas protection system is less than the humidity threshold.

[0057] In one embodiment, a plurality of humidity sensors are provided in the gas protection system, and the acquisition module is specifically used to determine a target humidity sensor that is not faulty from the plurality of humidity sensors; and to acquire the first humidity value from humidity values ​​collected by the target humidity sensor.

[0058] In one embodiment, a liquid level sensor is provided in the expansion device of the cooling system, and the determination module is also used to determine the amount of liquid level drop in the expansion device within the current calculation cycle based on the detection value of the liquid level sensor, and each calculation cycle includes at least one sampling cycle of the liquid level sensor; and determine whether the coolant is leaking based on the amount of liquid level drop.

[0059] In one embodiment, the determination module is specifically used to determine the coolant leakage of a target leakage level from a plurality of leakage levels according to the liquid level drop, the plurality of leakage levels correspond to different leakage flow rates, and the higher the leakage level, the greater the leakage flow rate.

[0060] In one embodiment, the determination module is specifically used to determine the rate of decrease of the liquid level in the expansion device during the current calculation cycle based on the amount of liquid level decrease; when the decrease rate is greater than or equal to a rate threshold, it is determined that the coolant has leaked at the target leakage level, and the rate threshold corresponds to the target leakage level.

[0061] In one embodiment, the determination module is specifically used to determine that the coolant has leaked at the target leakage level when the liquid level drop is greater than or equal to a drop threshold, and the drop threshold corresponds to the target leakage level.

[0062] In one embodiment, the determination module is specifically used to determine the amount of decrease in the liquid level in the expansion device corresponding to each leakage level within a calculation cycle according to the detection value of the liquid level sensor. Different leakage levels correspond to different calculation cycles, and the lower the leakage level, the longer the calculation cycle.

[0063] In one embodiment, the leakage detection device further includes an output module for outputting an alarm signal corresponding to the target leakage level when it is determined that the coolant leaks at the target leakage level.

[0064] In one embodiment, the determination module is specifically used to determine a target liquid level sensor that is not faulty from a plurality of the liquid level sensors; and determine the liquid level drop amount according to the detection value of the target liquid level sensor.

[0065] In a fourth aspect, a readable storage medium is provided, on which a computer program is stored. When the computer program is run on a leakage detection device, the leakage detection device executes the leakage detection method provided in the second aspect.

[0066] In a fifth aspect, a leakage detection device is provided, comprising: a processor; a memory; and a computer program, wherein the computer program is stored in the memory, and when the computer program is executed by the processor, the screening device executes the leakage detection method provided in the aforementioned second aspect.

[0067] In a sixth aspect, a computer program product is provided, comprising: a computer program code, and when the computer program code is run on a leakage detection device, the leakage detection device executes the leakage detection method provided in the aforementioned second aspect.

[0068] In a seventh aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, so that a leakage detection device equipped with the chip executes the leakage detection method provided in the aforementioned second aspect.

[0069] It can be understood that the leakage detection devices provided in the third and fifth aspects, the readable storage medium provided in the fourth aspect, the computer program product provided in the sixth aspect, and the chip provided in the seventh aspect are all used to execute the leakage detection method provided in the second aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 A schematic diagram showing the principle of a cooling system for a battery cabinet provided in an embodiment of the present application is shown.

[0071] Figure 2 A schematic diagram of the internal structure of a battery cabinet provided in an embodiment of the present application is shown.

[0072] Figure 3 A schematic diagram of the principles of a gas protection system for an energy storage system provided in an embodiment of the present application is shown.

[0073] Figure 4 A schematic diagram showing the principle of a gas protection system for another energy storage system provided in an embodiment of the present application is shown.

[0074] Figure 5 A circuit connection diagram of an energy storage system provided in an embodiment of the present application is shown.

[0075] Figure 6 A flow chart of the steps of a leakage detection method provided in an embodiment of the present application is shown.

[0076] Figure 7 A schematic diagram showing the principle of a gas protection system for another energy storage system provided in an embodiment of the present application is shown.

[0077] Figure 8A schematic diagram of dividing leakage levels provided in an embodiment of the present application is shown.

[0078] Fig. 9 A schematic flow chart of a leakage detection method provided in an embodiment of the present application is shown.

[0079] Fig.10 A schematic structural diagram of a leakage detection device provided in an embodiment of the present application is shown.

[0080] Fig.11 A structural block diagram of a leakage detection device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0081] The technical solution in the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0082] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0083] The term "comprising" herein indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. The terms "comprising", "including", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized. Below, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0084] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0085] In an energy storage system with batteries as carriers, the more cells there are, the greater the capacity of the energy storage system. Taking direct-mounted energy storage as an example, high-voltage direct-mounted energy storage technology integrates the voltage source converter (VSC) with the energy storage valve, which has the advantages of high modularity, good economic benefits, and high reliability.

[0086] The energy storage valve is an energy storage system that can achieve electrical energy storage and power output through valve control. It consists of multiple energy storage modules, which include power units and battery cabinets. Each battery cabinet includes a certain number of battery cells. During the operation of the energy storage valve, the power unit and battery cells will generate heat, so the battery cabinet is equipped with a cooling system to cool the battery cabinet.

[0087] Figure 1 FIG. 1 is a schematic diagram showing a cooling system for a battery cabinet provided in an embodiment of the present application. Figure 1 As shown, the cooling system includes a heat exchange device 11, an expansion device 12 and a liquid circulation device 13. The heat exchange device 11, the liquid circulation device 13 and the battery cabinet 14 are connected in sequence through a liquid circulation pipeline 15, and the expansion device 12 is connected in parallel with the liquid circulation device 13.

[0088] Among them, the liquid circulation device 13 is, for example, a circulation pump, the input end of the liquid circulation device 13 is connected to the output end of the heat exchange device 11 through the liquid circulation pipeline 15, the output end of the liquid circulation device 13 is connected to the input end of the battery cabinet 14 through the liquid circulation pipeline 15, and the output end of the battery cabinet 14 is connected to the input end of the heat exchange device 11 through the liquid circulation pipeline 15.

[0089] After the liquid circulation device 13 is started, the coolant can be circulated between the battery cabinet 14 and the heat exchange device 11. After the coolant enters the battery cabinet 14, it absorbs the heat generated by the battery cells to reduce the temperature of the battery cabinet. After the coolant enters the heat exchange device 11, it is cooled by the heat exchange device 11, thereby reducing the temperature of the battery cabinet 14 and ensuring the safe operation of the battery cabinet 14.

[0090] The expansion device 12 is, for example, an expansion tank, which is used to store the coolant (for example, water) in the cooling system and to buffer the volume change of the coolant caused by temperature change. The expansion device 12 is connected in parallel with the liquid circulation device 13. Affected by thermal expansion and contraction, when the coolant expands due to heat, the volume of the coolant increases, and part of the expanded coolant enters the expansion device 12, which can reduce the pressure in the liquid circulation pipeline 15. When the volume of the coolant decreases after cooling, the expansion device 12 can add a part of the coolant to the liquid circulation pipeline 15 to maintain the pressure in the liquid circulation pipeline 15 stable.

[0091] Figure 2FIG. 1 is a schematic diagram showing the internal structure of a battery cabinet provided in an embodiment of the present application. Figure 2 As shown, the battery cabinet 14 includes a plurality of battery boxes (also called battery clusters) 141, each battery box 141 includes a plurality of battery cells connected in series and / or in parallel, and the plurality of battery boxes 141 are connected in series and / or in parallel.

[0092] The battery cabinet 14 is provided with a main joint 142, and the liquid circulation pipeline 15 inputs cooling liquid into the battery cabinet 14 through the main joint 142. Each battery box 141 is provided with a tap 143, and the cooling liquid input into the main joint 142 enters each battery box 141 through the tap 143. When the main joint 142 and / or the tap 143 falls off, the main joint 142 and / or the tap 143 are poorly installed, or the sealing rings provided at the main joint 142 and / or the tap 143 are aged, the cooling liquid will leak into the battery cabinet 14.

[0093] The leaked coolant may corrode metal objects in the battery cabinet 14 and / or cause a short circuit inside the battery cabinet 14. The short circuit may cause a fire or even an explosion in the battery cabinet 14, threatening the safety of the battery cabinet 14. Therefore, it is necessary to detect whether the coolant is leaking in real time during the use of the battery cabinet, so as to take timely measures to solve the leakage problem when the coolant leaks.

[0094] The embodiment of the present application provides an energy storage system, which includes a controller and at least one battery cabinet, and the battery cabinet is connected to a cooling system and a gas protection system. A humidity sensor is provided in the gas protection system, and the humidity sensor is connected to the controller. The controller can obtain a first humidity value in the gas protection system through the humidity sensor, and when the first humidity value is greater than or equal to the humidity threshold, determine that the coolant in the cooling system is leaking, and can detect a slight leak of the coolant, with relatively high detection accuracy.

[0095] When a slight leak of coolant occurs, it can accurately detect whether the coolant is leaking, so that measures can be taken to solve the leakage problem when a slight leak of coolant occurs, thereby reducing the probability of corrosion and short circuit problems in the battery cabinet due to coolant leakage, thereby reducing the risk of fire and explosion in the battery cabinet, and improving the safety and reliability of the battery cabinet.

[0096] Moreover, the leakage detection method provided in the embodiment of the present application only needs to set a humidity sensor in the gas protection system of the battery cabinet, and the hardware modification is relatively small. The humidity sensor can be set outside the battery cabinet. When the humidity sensor is set outside the battery cabinet, it can not only make the power supply of the humidity sensor simpler, but also reduce the electromagnetic interference of the battery cabinet to the humidity sensor, which can not only make the leakage detection have higher accuracy, but also can select humidity sensors with lower electromagnetic compatibility, thereby reducing the cost of leakage detection.

[0097] In some embodiments, the gas protection system includes a gas circulation device, the air inlet of the battery cabinet is connected to the air outlet of the gas circulation device through a gas circulation pipeline, and the exhaust port of the battery cabinet is connected to the air inlet of the gas circulation device through a gas circulation pipeline.

[0098] Figure 3 FIG. 1 is a schematic diagram showing the principle of a gas protection system for an energy storage system provided in an embodiment of the present application. Figure 3 As shown, the gas protection system includes a storage valve 31 and a gas circulation device 32 composed of a plurality of battery cabinets 14. The gas circulation device 32 is, for example, a circulation fan, but is not limited thereto. The battery cabinet 14 forms a space for installing a battery box, and the air inlet of the battery cabinet 14 is connected to the air outlet of the gas circulation device 32 through a gas circulation pipeline 33, and the exhaust port of the battery cabinet 14 is connected to the air inlet of the gas circulation device 32 through a gas circulation pipeline 33.

[0099] Before the energy storage valve 31 operates, inert gas (such as nitrogen) is added to the battery cabinet 14. During the operation of the energy storage valve 31, the gas circulation device 32 operates, so that the inert gas can circulate between the battery cabinet 14, the gas circulation device 32 and the gas circulation pipeline 33.

[0100] like Figure 3 As shown, a humidity sensor 34 is provided in the gas protection system. The humidity sensor 34 can be provided in the gas circulation pipeline 33 to collect the humidity value in the gas circulation pipeline 33 .

[0101] In an embodiment of the present application, the gas protection system includes a gas circulation device, which can enable the gas in the gas protection system to circulate within the gas protection system, so that the gas composition at various positions in the gas protection system is close to or remains consistent, so that various sensors in the energy storage system can be set outside the battery cabinet, thereby reducing the electromagnetic interference of the battery cabinet to various sensors.

[0102] In some embodiments, the gas protection system further includes a three-way valve, which is disposed between the battery cabinet and the gas circulation device, wherein a first end of the three-way valve is connected to the gas outlet of the battery cabinet 14 through a gas circulation pipeline 33, a second end of the three-way valve is connected to the gas inlet of the gas circulation device 32 through a gas circulation pipeline 33, and a third end of the three-way valve is connected to the external environment. The three-way valve can connect the interior of the battery cabinet 14 with the external environment to discharge the gas with high humidity in the battery cabinet 14 into the external environment.

[0103] In some embodiments, the gas protection system further includes a gas supply device, which is connected to the gas inlet of the gas circulation device 32 via a gas supply valve. The gas supply device can supply inert gas to the gas protection system.

[0104] In the embodiment of the present application, the gas protection system includes a three-way valve, through which the gas protection system and the external environment can be connected, so that the gas in the gas protection system can be easily replaced. The gas protection system includes a gas replenishing device, through which the gas protection system can be replenished with gas, so that the gas protection system can maintain a stable pressure.

[0105] Figure 4 FIG. 2 shows a schematic diagram of the principle of another gas protection system of an energy storage system provided in an embodiment of the present application. Figure 4 As shown, the gas protection system includes an energy storage valve 31 composed of multiple battery cabinets 14, a three-way valve 35, an air supply device (such as an air supply tank) 36 and a gas circulation device 32, and a humidity sensor 34 arranged in a gas circulation pipeline 33.

[0106] The gas outlet of the gas circulation device 32 is connected to the gas inlet of the battery cabinet 14 through the gas circulation pipeline 33; the exhaust port of the battery cabinet 14 is connected to the first end of the three-way valve 35 through the gas circulation pipeline 33; the second end of the three-way valve 35 is connected to the gas inlet of the gas circulation device 32 through the gas circulation pipeline 33; the third end of the three-way valve 35 is connected to the external environment. At the same time, the gas supply device 36 is connected to the gas inlet of the gas circulation device 32 through the gas supply valve (not shown in the figure).

[0107] Before the energy storage valve 31 is started, the battery cabinet 14 is sealed, the first end and the third end of the three-way valve 35 are connected, the first end and the second end of the three-way valve 35 are closed, and the air supply valve is opened. The gas circulation device 32 is started to discharge the air in the battery cabinet 14, and the air supply device 36 supplies inert gas to the battery cabinet 14. After the air supply is completed, the first end and the third end of the three-way valve 35 are closed, the first end and the second end of the three-way valve 35 are connected, and the air supply valve is closed.

[0108] After the energy storage valve 31 starts to operate, the gas circulation device 32 keeps operating, so that the inert gas in the battery cabinet 14 circulates in the gas circulation pipeline 33 and the battery cabinet 14. The circulating inert protective gas isolates the battery cells in the battery cabinet 14 from the external environment, which can play a certain fire extinguishing role and effectively reduce the risk of fire and explosion in the battery cabinet.

[0109] When a slight leak occurs in the coolant, the leaked coolant will evaporate due to heat and enter the circulating inert gas, increasing the humidity of the inert gas, thereby increasing the humidity in the gas protection system, that is, increasing the humidity in the battery cabinet 14.

[0110] Figure 5 FIG. 1 shows a circuit connection diagram of an energy storage system provided in an embodiment of the present application. Figure 5As shown, the controller is electrically connected to the humidity sensor, the gas circulation device, the gas supply valve and the three-way valve in the gas protection system respectively.

[0111] The humidity sensor 34 can be arranged in the gas circulation pipeline 33 or in the battery cabinet 14 to collect the humidity value in the gas protection system, which is the humidity value in the battery cabinet 14. The controller can obtain the first humidity value in the gas protection system through the humidity sensor, compare the first humidity value with the humidity threshold, and determine that the coolant has a slight leakage when the first humidity value is greater than or equal to the preset humidity threshold. At the same time, the controller can control the start and stop of the gas circulation device 32, control the opening and closing of the gas supply valve, and control the action of the three-way valve 35.

[0112] Figure 6 A flow chart of the steps of a leakage detection method provided by an embodiment of the present application is shown. The method can be Figure 5 The controller shown executes, including step 61 and step 62.

[0113] Step 61: Obtain a first humidity value in a gas protection system of a battery cabinet.

[0114] like Figure 1 As shown, after the energy storage valve 31 is started, the battery cabinet 14 is in a sealed state, and the cooling system and the gas protection system are both started. At this time, the liquid circulation device 13 is in operation, so that the coolant circulates between the heat exchange device 11 and the battery cabinet 14. At the same time, the gas circulation device 32 is in operation, so that the inert gas circulates in the battery cabinet 14 and the gas circulation pipeline 33.

[0115] In this embodiment, after the energy storage valve 31 starts to operate, the controller can sample the humidity in the gas protection system in real time through the humidity sensor 34 to obtain a humidity value, which is called a first humidity value.

[0116] Step 62: When the first humidity value is greater than or equal to the humidity threshold, determine that there is a coolant leak in the cooling system of the battery cabinet.

[0117] In this embodiment, after obtaining the first humidity value, the controller can compare the first humidity value with a pre-stored humidity threshold. When the comparison determines that the first humidity value is greater than or equal to the humidity threshold, it is determined that a small amount of coolant has leaked into the battery cabinet 14, and a slight leakage of coolant has occurred.

[0118] It should be understood that when one or more of the following situations occurs, such as the main joint 142 is poorly installed, the tap joint 143 is poorly installed, the sealing ring is aged, the liquid circulation pipeline 15 is slightly ruptured, etc., the coolant may leak slightly and a small amount of coolant may leak into the interior of the battery cabinet 14.

[0119] A small amount of coolant leaked into the battery cabinet 14 evaporates due to heat and enters the circulating inert gas. After a certain period of circulation, the humidity value in the gas protection system reaches the humidity threshold. Therefore, after the controller detects and determines that the first humidity value is greater than or equal to the humidity threshold, it can determine that the coolant has a slight leak.

[0120] Optionally, the method may further include:

[0121] When coolant leakage is confirmed, the gas protection system is controlled to adjust the humidity so that the humidity value in the gas protection system is less than the humidity threshold.

[0122] In some embodiments, after determining that a slight leak of the coolant occurs, the controller may control the gas protection system to ventilate so that the humidity value in the gas protection system is less than the humidity threshold. For example, the controller may control the three-way valve 35 to connect to the external environment, and control the air supply valve to open, so that the air supply device 36 replenishes the inert gas into the gas protection system to discharge the inert gas with high humidity out of the gas protection system, thereby adjusting the humidity in the gas protection system, and adjusting the humidity value in the gas protection system to below the humidity threshold, that is, adjusting the humidity value in the battery cabinet 14 to below the humidity threshold.

[0123] For example, after determining that the first humidity value is greater than or equal to the humidity threshold, the controller can control the connection between the first end and the third end of the three-way valve 35, control the connection between the first end and the second end of the three-way valve 35 to be closed, and control the air supply valve to be opened. At this time, the gas circulation device 32 can discharge the inert gas with high humidity in the battery cabinet 14 into the external environment through the third end of the three-way valve 35. At the same time, the dry inert gas in the air supply device 36 can enter the battery cabinet 14, and the dry inert gas replaces the inert gas with high humidity in the gas protection system, so that the gas protection system can be controlled to adjust the humidity.

[0124] During the humidity adjustment process, the controller can obtain the humidity value in the gas protection system in real time through the humidity sensor 34. When the humidity value is lower than the humidity threshold and the difference between the humidity threshold reaches a preset difference, the controller can close the air supply valve, control the first end and the third end of the three-way valve 35 to be closed, and control the first end and the second end of the three-way valve 35 to be connected to stop humidity adjustment.

[0125] Figure 7 FIG. 2 shows a schematic diagram of the principle of another gas protection system of an energy storage system provided in an embodiment of the present application. Figure 7As shown, a humidity regulating device 37 may be further provided in the gas protection system, and the humidity regulating device 37 is connected to the controller. When the controller determines that the coolant is leaking, the controller may control the humidity regulating device 37 to regulate the humidity of the gas protection system so that the humidity value in the gas protection system is less than the humidity threshold.

[0126] Exemplarily, the humidity adjustment device is, for example, a dehumidifier, which is disposed in the gas circulation pipeline 33. After determining that a slight leak of the coolant occurs, the controller can control the dehumidifier to start running, and the dehumidifier absorbs moisture in the inert gas to control the gas protection system to adjust the humidity. Similarly, during the humidity adjustment process, the controller can obtain the humidity value in the gas protection system through the humidity sensor 34. When the humidity value is lower than the humidity threshold and the difference between the humidity value and the humidity threshold reaches a preset difference, the controller can control the dehumidifier to stop running to stop the humidity adjustment.

[0127] The above are merely illustrative examples, and specific methods for controlling the gas protection system to adjust humidity may include but are not limited to the above examples.

[0128] In some embodiments, during the humidity adjustment process, before the humidity adjustment, or after the humidity adjustment, the controller may output an alarm signal corresponding to a minor leakage, and notify the staff of a minor leakage of the coolant through the alarm signal. Alternatively, after determining that a minor leakage of the coolant has occurred, the controller may only output an alarm signal corresponding to a minor leakage, and notify the staff at work to handle the minor leakage through the alarm signal.

[0129] It should be understood that when a slight leak of coolant occurs, less coolant enters the battery cabinet, and the moisture in the battery cabinet can be reduced by humidity adjustment, thereby reducing the probability of corrosion and short circuit inside the battery cabinet due to coolant leakage.

[0130] In the embodiment of the present application, after determining that the coolant has a slight leak, the gas protection system can be controlled to adjust the humidity to reduce the moisture in the battery cabinet to protect the battery cabinet. The humidity adjustment can enable the battery cabinet to continue to operate when the coolant has a slight leak, thereby reducing the probability of the battery cabinet being shut down for maintenance.

[0131] Optionally, a plurality of humidity sensors are provided in the gas protection system, and the step of obtaining the first humidity value may include:

[0132] determining a target humidity sensor that is not faulty from among the plurality of humidity sensors;

[0133] A first humidity value is obtained from humidity values ​​collected by the target humidity sensor.

[0134] Exemplarily, three humidity sensors may be provided in the gas protection system. In the process of determining the first humidity value in the gas protection system, the controller may simultaneously sample the humidity in the gas protection system through the three humidity sensors. After the humidity value sent by a humidity sensor is not received, it is determined that the humidity sensor is faulty. Alternatively, after detecting that a humidity sensor is offline, it is determined that the humidity sensor is faulty. Alternatively, when the humidity value sampled by a humidity sensor exceeds the range of the humidity sensor, it is determined that the humidity sensor is faulty. Methods for detecting whether a humidity sensor is faulty may include but are not limited to the above examples.

[0135] For example, if it is determined that one of the three humidity sensors is faulty and the other two humidity sensors are not faulty, the other two humidity sensors are target humidity sensors. The controller may calculate the average of the humidity values ​​sampled by the other two humidity sensors that are not faulty, and determine the average as the first humidity value in the gas protection system. Alternatively, the controller may randomly select one humidity value from the humidity values ​​sampled by the two humidity sensors that are not faulty as the first humidity value in the gas protection system.

[0136] For another example, if it is determined that two of the three humidity sensors are faulty and the other humidity sensor is not faulty, the other humidity sensor is the target humidity sensor. The controller can directly determine the humidity value sampled by the humidity sensor that is not faulty as the first humidity value.

[0137] In an embodiment of the present application, multiple humidity sensors are arranged in the gas protection system. In the process of determining the first humidity value in the gas protection system, the first humidity value is obtained from the humidity values ​​collected by the humidity sensors that have not failed. This can improve the reliability of the first humidity value, thereby reducing the probability of misjudgment of leakage detection and improving the reliability of the detection results.

[0138] Optionally, the method may further include:

[0139] Determine the liquid level drop amount of the liquid level in the expansion device in a current calculation cycle according to the detection value of the liquid level sensor, each calculation cycle including at least one sampling cycle of the liquid level sensor;

[0140] Determine if a coolant leak is present based on the amount of fluid level drop.

[0141] like Figure 1As shown, a liquid level sensor 121 is provided in the expansion device 12, and the controller is in communication connection with the liquid level sensor 121. The controller can continuously detect the liquid level in the expansion device 12 through the liquid level sensor 121 to obtain the detection value of the liquid level sensor 121, and the detection value is the liquid level value in the expansion device 12. The controller can determine the amount of liquid level drop in the expansion device during the current calculation cycle according to the detection value of the liquid level sensor 121, and then determine whether the coolant is leaking according to the amount of liquid level drop.

[0142] In the embodiment of the present application, the amount of liquid level drop in the expansion device during the current calculation cycle can be determined by the detection value of the liquid level sensor in the expansion device, and whether the coolant is leaking can be determined based on the amount of liquid level drop. Since the liquid level in the expansion device changes rapidly when a relatively serious leak of the coolant occurs, it is possible to quickly detect whether the coolant is leaking based on the amount of liquid level drop when a relatively serious leak of the coolant occurs, thereby enabling timely detection of a relatively serious leak of the coolant.

[0143] In some embodiments, other leaks except slight leaks can be divided into multiple leak levels according to the leakage flow rate when the coolant leaks. In the process of detecting whether the coolant is leaking, the coolant can be determined to have a target leak level from multiple leak levels according to the amount of liquid level drop. The multiple leak levels correspond to different leak flow rates, and the higher the leak level, the greater the leak flow rate.

[0144] Figure 8 FIG. 1 shows a schematic diagram of a leakage level classification provided by an embodiment of the present application. Figure 8 As shown, for minor leaks, the controller can detect the humidity value in the gas protection system through a humidity sensor, and determine that the coolant is leaking when the humidity value is greater than or equal to a humidity threshold.

[0145] For leaks other than minor leaks, the leaks can be divided into the first leak level, the second leak level and the third leak level in sequence according to the leakage flow of the coolant when the leak occurs. When the first leak level leaks, the leakage flow of the coolant is the largest, and the first leak level is the highest. When the third leak level leaks, the leakage flow of the coolant is the smallest, and the third leak level is the lowest.

[0146] like Figure 2 As shown, when the main joint 142 falls off or all the sub-joints 143 fall off and cause coolant leakage, the leakage flow of the coolant is the flow of the coolant in the main joint 142 during the normal circulation of the coolant. The flow can be set to a first leakage flow, and a leakage with a leakage flow greater than or equal to the first leakage flow is classified as a first leakage level.

[0147] For example, in the normal circulation process of the coolant, if the flow rate of the coolant in the main joint 142 is Y1 liter per minute (min), then when the main joint 142 falls off or all the sub-joints 143 fall off, the amount of coolant leaking into the battery cabinet 14 per minute is Y1 liter. If the unit time is selected as seconds (s), the amount of coolant leakage per second is m 3 , that is, the leakage flow rate of the coolant is The leakage flow is a first leakage flow corresponding to a first leakage level.

[0148] When one of the taps 143 falls off, the leakage flow of the coolant is the flow of the coolant in the tap 143 during the normal circulation of the coolant. The flow of the coolant in the tap 143 can be set to the second leakage flow, and the leakage whose leakage flow is greater than or equal to the second leakage flow and less than the first leakage flow is classified as the second leakage level. For example, if the flow in the tap 143 during the normal circulation of the coolant is Y2 liters per minute, then in the case where a single tap 143 falls off, the leakage amount of the coolant leaking into the battery cabinet 14 per minute is Y2 liters, and the second leakage flow is

[0149] At the same time, for leakage caused by aging of the sealing ring, poor installation of the main joint 142 and / or the tap joint 143, etc., a third leakage flow rate can be set. The third leakage flow rate is less than the second leakage flow rate and greater than the leakage flow rate of the coolant in the case of a slight leakage. Leakages with a leakage flow rate greater than or equal to the third leakage flow rate and less than the second leakage flow rate can be classified as a third leakage level. For example, if the flow rate of the coolant leaking into the battery cabinet 14 per minute when a leakage of the third leakage level occurs is Y3, then the third leakage flow rate is The flow rate Y3 can be specifically set according to the leakage of the coolant.

[0150] In some embodiments, for the first leakage level, the second leakage level, and the third leakage level, after obtaining the amount of liquid level drop in the current calculation cycle, it is first possible to determine whether the coolant has a leakage of the first leakage level according to the amount of liquid level drop. After determining that the coolant has not leaked at the first leakage level, it is possible to determine whether the coolant has a leakage of the second leakage level according to the amount of liquid level drop. After determining that the coolant has not leaked at the second leakage level, it is possible to determine whether the coolant has a leakage of the third leakage level according to the amount of liquid level drop. Alternatively, it is possible to determine whether the coolant has a leakage of the first leakage level, the second leakage level, and the third leakage level, respectively, according to the amount of liquid level drop.

[0151] In the embodiment of the present application, leakage conditions other than minor leakage are classified into different leakage levels. During the leakage detection process, whether a leakage of a certain leakage level occurs in the coolant is determined by the amount of drop in the liquid level in the expansion device during the current calculation cycle. This allows for precise detection of leakage conditions, making it easier for staff to take corresponding measures for leakages of different leakage levels, thereby improving the maintenance efficiency of the battery cabinet.

[0152] In some embodiments, the detection value of the liquid level sensor may be obtained in each calculation cycle, and the liquid level drop amount of the liquid level in the expansion device 12 in the current calculation cycle may be determined according to the detection value in the current calculation cycle. In the process of determining whether the coolant is leaking according to the liquid level drop amount, after the detection starts, it is determined whether the coolant is leaking every preset time period, and the preset time period is equal to the length of the calculation cycle.

[0153] Optionally, the step of determining, from among a plurality of leakage levels, whether the coolant has leaked a target leakage level according to the amount of liquid level drop may include:

[0154] Determine the rate of decrease of the liquid level in the expansion device in the current calculation cycle according to the amount of decrease of the liquid level;

[0155] When the decreasing rate is greater than or equal to the rate threshold, it is determined that the coolant leaks at a target leakage level, and the rate threshold corresponds to the target leakage level.

[0156] In some embodiments, different rate thresholds may be set for each leakage level, and the higher the leakage level, the larger the corresponding rate threshold. In the process of determining whether the coolant is leaking according to the amount of liquid level drop, the ratio between the amount of liquid level drop and the duration of the calculation cycle may be calculated to obtain the rate of drop of the liquid level in the expansion device 12 during the current calculation cycle. When the rate of drop is greater than or equal to the rate threshold corresponding to a certain leakage level, the leakage level is determined to be the target leakage level, and the coolant is leaking at the target leakage level.

[0157] like Figure 1 As shown, when leakage of the first leakage level, the second leakage level, and the third leakage level occurs, the expansion device 12 replenishes coolant into the cooling system, and the liquid level in the expansion device 12 continuously decreases. When leakage of different leakage levels occurs, the rate of decrease of the liquid level in the expansion device 12 is different, so different rate thresholds can be set for different leakage levels.

[0158] Exemplarily, the first leakage flow corresponding to the first leakage level is If the expansion device 12 is an expansion tank, and the diameter of the expansion tank is D, then the cross-sectional area of ​​the expansion tank is When a leakage of the first leakage level occurs, the amount of drop in the liquid level in the expansion device 12 per unit time is H1, H1 = (Y1 / 60000) / (3.14×D 2 / 4). The first rate threshold corresponding to the first leakage level may be set to H1. In the leakage detection process, when it is determined that the decreasing rate in the current calculation cycle is greater than or equal to H1, it is determined that the coolant has a leakage of the first leakage level.

[0159] Similarly, the second leakage flow rate corresponding to the second leakage level is When the coolant leaks at the second level, the drop in the liquid level in the expansion device 12 per unit time is H2, H2 = (Y2 / 60000) / (3.14×D 2 / 4). The second rate threshold corresponding to the second leakage level may be set to H2. In the leakage detection process, when it is determined that the decreasing rate in the current calculation cycle is greater than or equal to H2, it is determined that the coolant has a leakage of the second leakage level.

[0160] Similarly, the third leakage flow rate corresponding to the third leakage level is When the coolant leaks at the third level, the drop in the liquid level in the expansion device 12 per unit time is H3, H3 = (Y3 / 60000) / (3.14×D 2 / 4). The third rate threshold corresponding to the third leakage level may be set to H3. In the leakage detection process, when it is determined that the decreasing rate in the current calculation cycle is greater than or equal to H3, it is determined that the coolant has a leakage of the third leakage level.

[0161] In some embodiments, a detection value of the liquid level sensor 121 at the beginning of the current calculation cycle can be obtained, and the detection value is the liquid level value in the expansion device 12 at the beginning of the current calculation cycle. And a detection value of the liquid level sensor 121 at the end of the current calculation cycle is obtained, and the detection value is the liquid level value in the expansion device 12 at the end of the current calculation cycle.

[0162] Then, the difference between the two detection values ​​can be calculated to obtain the liquid level drop amount in the expansion device 12 in the current calculation cycle, and the ratio between the liquid level drop amount and the duration of the calculation cycle can be calculated to obtain the drop rate. The drop rate is the drop rate of the liquid level in the expansion device 12 in the current calculation cycle, and the drop rate is compared with the rate threshold corresponding to each leakage level. When the drop rate is greater than or equal to the rate threshold corresponding to a certain leakage level, the leakage level is determined to be the target leakage level, and the coolant leaks at the target leakage level.

[0163] In some embodiments, the liquid level sensor 121 samples the liquid level in the expansion device 12 at a fixed sampling period to obtain a detection value of each sampling period, and the controller can store each detection value. In the process of determining the drop amount in the current calculation period, the controller can determine the current moment as the end moment of the current calculation period, and determine the detection value of the liquid level sensor 121 at the current moment as the detection value at the end of the current calculation period.

[0164] At the same time, the controller can obtain the detection value of the pre-stored target time and determine the detection value as the detection value at the beginning of the current calculation cycle. The interval between the target time and the current time is equal to the length of the calculation cycle. Then, the controller can calculate the difference between the two detection values ​​to obtain the drop in the liquid level in the expansion device 12 during the current calculation cycle.

[0165] In the embodiment of the present application, whether a coolant leaks at a certain leakage level is determined based on the rate of decrease of the liquid level in the expansion device. Since the leakage flow of the coolant directly affects the rate of decrease of the liquid level in the expansion device, whether the coolant leaks can be detected more accurately based on the rate of decrease of the liquid level in the expansion device.

[0166] Optionally, the step of determining, from among a plurality of leakage levels, whether the coolant has leaked a target leakage level according to the amount of liquid level drop may include:

[0167] When the liquid level drop is greater than or equal to the drop threshold, it is determined that the coolant leaks at a target leakage level, and the drop threshold corresponds to the target leakage level.

[0168] In some embodiments, different drop thresholds may be set for each leakage level. When determining whether the coolant has a leakage of a certain leakage level according to the amount of liquid level drop, the amount of liquid level drop and the drop threshold corresponding to each leakage level may be compared. When the amount of liquid level drop is greater than or equal to the drop threshold corresponding to a certain leakage level, the leakage level is determined to be the target leakage level, and the coolant has a leakage of the target leakage level.

[0169] For example, after determining the first leakage flow corresponding to the first leakage level, the product of the first leakage flow and the duration of the calculation cycle can be calculated to obtain the drop in the liquid level in the expansion device 12 in each calculation cycle when the leakage of the first leakage level occurs, and the drop can be set as the first drop threshold corresponding to the first leakage level. Similarly, the second drop threshold corresponding to the second leakage level can be set, and the third drop threshold corresponding to the third leakage level can be set.

[0170] In the process of detecting whether the coolant has a leakage of a certain leakage level, the liquid level drop in the expansion device 12 in the current calculation cycle is first calculated. If the liquid level drop is greater than or equal to the first drop threshold corresponding to the first leakage level, it is determined that the coolant has a leakage of the first leakage level. If it is determined that the coolant has not leaked the first leakage level, if the liquid level drop is greater than or equal to the second drop threshold corresponding to the second leakage level, it is determined that the coolant has a leakage of the second leakage level. If it is determined that the coolant has not leaked the second leakage level, if the liquid level drop is greater than or equal to the third drop threshold corresponding to the third leakage level, it is determined that the coolant has a leakage of the third leakage level.

[0171] In an embodiment of the present application, whether a coolant leaks at a certain leakage level is determined based on the amount of drop in the liquid level in the expansion device during a calculation cycle. Whether the coolant leaks can be directly determined based on the change in the liquid level in the expansion device, thereby quickly detecting whether the coolant leaks.

[0172] In some embodiments, different calculation cycles can be set for leaks of different leakage levels, and the lower the leakage level, the longer the calculation cycle. The calculation cycle corresponding to the leakage level can be determined based on at least one of the leakage flow corresponding to the leakage level, the cross-sectional area of ​​the expansion device, and the resolution of the liquid level sensor and the volume of the liquid storage device.

[0173] For example, when the resolution of the liquid level sensor is H0, in the case of a first leakage level of the coolant, the liquid level sensor 121 detects that the liquid level in the expansion device 12 changes for a time period of at least t1. For the first leakage level, the duration of the calculation cycle may be set to t1, or the duration of the calculation cycle may be set to a value greater than t1.

[0174] Similarly, in the case of a second leakage level of the coolant, the liquid level sensor 121 detects that the liquid level in the expansion device 12 changes for a time period of at least t2. For the second leakage level, the duration of the calculation cycle can be set to t2, or the duration of the calculation cycle can be set to a value greater than t2. In the case of a third leakage level of the coolant, the liquid level sensor 121 detects that the liquid level in the expansion device 12 changes for at least t3. For the third leakage level, the duration of the calculation cycle may be set to t3, or the duration of the calculation cycle may be set to a value greater than t3.

[0175] Among the first leakage level, the second leakage level and the third leakage level, the first leakage level corresponds to the largest leakage flow rate of the coolant and the highest level, and the third leakage level corresponds to the smallest leakage flow rate of the coolant and the lowest level, so t1 can be set to be less than t2, and t2 can be set to be less than t3.

[0176] In some embodiments, the controller can detect leakages of the first leakage level, the second leakage level and the third leakage level respectively, determine the amount of decrease in the liquid level in the expansion device corresponding to each leakage level within the calculation cycle according to the detection value of the liquid level sensor, and determine whether the coolant has a leakage of the corresponding leakage level according to the corresponding decrease.

[0177] For example, for the first leakage level, after determining the detection value at the current moment, the controller can determine the target moment that is t1 times longer than the current moment according to the calculation period t1 corresponding to the first leakage level, and determine the detection value of the pre-stored target moment. Then, the difference between the two detection values ​​is calculated (the difference is the amount of liquid level drop corresponding to the first leakage level), and the ratio of the difference to t1 is calculated to obtain the first drop rate. Finally, the controller can compare the first drop rate with the first rate threshold. If the first drop rate is greater than or equal to the first rate threshold, it is determined that the coolant has leaked at the first leakage level.

[0178] At the same time, for the second leakage level, after determining the detection value at the current moment, the controller can determine the target moment t2 away from the current moment according to the calculation period t2 corresponding to the second leakage level, and determine the detection value of the pre-stored target moment. Then, the difference between the two detection values ​​is calculated (the difference is the liquid level drop corresponding to the second leakage level), and the ratio of the difference to t2 is calculated to obtain the second drop rate. Finally, the controller can compare the second drop rate with the second rate threshold. If the second drop rate is greater than or equal to the second rate threshold, it is determined that the coolant has a second leakage level of leakage.

[0179] Likewise, for the third leakage level, the same method may be used to determine whether the coolant leaks at the third leakage level.

[0180] It should be understood that the first leakage level, the second leakage level, and the third leakage level can be detected at different times, for example, at the first second, whether the coolant leaks at the first leakage level, at the second second, whether the coolant leaks at the second leakage level, and at the third second, whether the coolant leaks at the third leakage level. While detecting the first leakage level, the second leakage level, and the third leakage level, the controller can execute steps 61 and 62 to determine whether the coolant leaks slightly.

[0181] The durations of the calculation cycle of the first leakage level, the calculation cycle of the second leakage level, and the calculation cycle of the third leakage level can be the same or different, as long as it is possible to detect whether the coolant leaks at the corresponding leakage level within the calculation cycle. For example, the durations of the calculation cycles of the first leakage level, the second leakage level, and the third leakage level can all be set to t3, or to a value greater than t3.

[0182] In the embodiment of the present application, a shorter calculation cycle can be set for leakage of high leakage level to improve the response speed and quickly detect leakage of high leakage level. A longer calculation cycle can be set for leakage of low leakage level to reduce the detection frequency, thereby reducing the calculation amount of the controller and thus reducing power consumption.

[0183] The calculation period is less than the total leakage duration of the coolant, and the total leakage duration is the duration required for the liquid storage device to be filled when a leakage of a corresponding leakage level occurs.

[0184] like Figure 2 and Figure 3 As shown, the battery cabinet 14 is provided with a liquid storage device 144 for storing leaked coolant. The liquid storage device 144 is arranged at the bottom of the battery box 141 and can receive the leaked coolant. The volume of the liquid storage device 144 is, for example, X liters.

[0185] For the first leakage level, when the coolant leaks at the first leakage level, the total leakage time required for the leaked coolant to fill the liquid storage device 144 is t4. Then, the calculation period corresponding to the first leakage level can be set to be less than t4, so that when a leakage of the first leakage level occurs, the leakage of the first leakage level can be detected at least once before the liquid storage device 144 is filled. Similarly, the calculation periods of the second leakage level and the third leakage level can be set to be less than t4.

[0186] The above are only illustrative examples, and the method for setting the calculation cycle may include but is not limited to the above examples. The length of the calculation cycle can be specifically set according to needs, as long as a leakage of a corresponding leakage level can be detected within the calculation cycle.

[0187] In an embodiment of the present application, when setting the calculation cycle corresponding to the leakage level according to parameters such as the leakage flow corresponding to the leakage level, the cross-sectional area of ​​the expansion device, the resolution of the liquid level sensor, and the volume of the liquid storage device included in the cooling system, the calculation cycle can be closely related to the leakage flow and leakage duration corresponding to the leakage level, so that not only a more accurate calculation cycle can be set, but also accurate detection of the corresponding leakage level can be achieved within the calculation cycle.

[0188] Optionally, the method may further include:

[0189] When it is determined that the coolant is leaking at a target leakage level, an alarm signal corresponding to the target leakage level is output.

[0190] For example, when the controller determines that the coolant has a first leakage level, it can output a first alarm signal; when the controller determines that the coolant has a second leakage level, it can output a second alarm signal; when the controller determines that the coolant has a third leakage level, it can output a third alarm signal. The first alarm signal, the second alarm signal, and the third alarm signal are different alarm signals to identify different leakage levels, so that the staff can determine the corresponding leakage level according to different alarm signals.

[0191] The alarm signal may be an audible and visual alarm signal, and the controller may be connected to the audible and visual alarm to control the audible and visual alarm to output different first alarm signals, second alarm signals, and third alarm signals. Alternatively, the alarm signal may be an image signal, and the controller may be connected to the display to control the display to output different first alarm signals, second alarm signals, and third alarm signals. The specific forms of the alarm signal may include but are not limited to the above examples.

[0192] In an embodiment of the present application, different alarm signals are output for leaks of different leakage levels, and the staff can be informed of the coolant leakage through different alarm signals, so that the staff can take different measures according to different leakage situations.

[0193] Optionally, a plurality of liquid level sensors are provided in the expansion device, and the step of determining the liquid level drop amount of the liquid level in the expansion device in the current calculation cycle according to the detection values ​​of the liquid level sensors may include:

[0194] determining a target liquid level sensor that is not faulty from among the plurality of liquid level sensors;

[0195] The amount of liquid level drop is determined based on the detection value of the target liquid level sensor.

[0196] like Figure 1 As shown, three liquid level sensors 121 can be provided in the expansion device, and the controller can detect the liquid level in the expansion device 12 at the same time through the three liquid level sensors. During the detection process, if the detection value sent by a certain liquid level sensor is not received, it is determined that the liquid level sensor is faulty. Alternatively, after detecting that a certain liquid level sensor is offline, it is determined that the liquid level sensor is faulty. Alternatively, when the liquid level value read by a certain liquid level sensor exceeds the range of the liquid level sensor, it is determined that the liquid level sensor is faulty. The method for determining whether the liquid level sensor is faulty may include but is not limited to the above examples.

[0197] For example, if it is determined that one of the three liquid level sensors is faulty and the other two liquid level sensors are not faulty, the other two liquid level sensors 121 are target liquid level sensors. The controller may calculate the average of the detection values ​​obtained by the other two liquid level sensors that are not faulty, and use the average to determine the detection value in the expansion device 12. Alternatively, the controller may randomly select one liquid level value from the detection values ​​sampled by the two liquid level sensors that are not faulty as the detection value in the expansion device 12, and then determine the liquid level drop amount in the expansion device in the current calculation cycle based on the detection value.

[0198] For another example, if it is determined that two of the three liquid level sensors are faulty and the other one is not faulty, the other one is the target liquid level sensor. The controller can directly determine the detection value of the liquid level sensor that is not faulty as the detection value in the expansion device, and then determine the liquid level drop amount in the expansion device in the current calculation cycle according to the detection value.

[0199] In an embodiment of the present application, a plurality of liquid level sensors are arranged in the expansion device, and the amount of liquid level drop in the expansion device during the current calculation cycle can be determined based on the detection value of a liquid level sensor that is not faulty among the plurality of liquid level sensors, thereby improving the reliability of the liquid level drop and thus improving the accuracy of leakage detection.

[0200] In some embodiments, the controller may count the number of occurrences of a target calculation cycle. When the number of occurrences of the target calculation cycle reaches N times, it is determined that the coolant is leaking at a target leakage level. The target calculation cycle is a calculation cycle in which the rate of decrease of the liquid level in the expansion device is greater than or equal to a rate threshold corresponding to the target leakage level, or a calculation cycle in which the amount of decrease in the liquid level is greater than or equal to a decrease threshold.

[0201] In some embodiments, when the controller is judging whether a coolant leak occurs by the rate of decrease of the liquid level in the expansion device, it can determine that a coolant leak occurs at a target leakage level after determining in N consecutive calculation cycles that the rate of decrease is greater than or equal to a rate threshold corresponding to the target leakage level.

[0202] For example, N is 3. When the controller determines for the first time in a certain calculation cycle that the rate of decrease of the liquid level in the expansion device 12 is greater than or equal to the first rate threshold, the calculation cycle can be determined to be 1 target calculation cycle, and the target calculation cycle occurs once. When the controller determines for the second time in the next adjacent calculation cycle that the rate of decrease of the liquid level in the expansion device 12 is greater than or equal to the first rate threshold, it can be determined that the number of consecutive occurrences of the target calculation cycle reaches 2. By analogy, if the number of consecutive occurrences of the target calculation cycle reaches 3, it is determined that the coolant has a first leakage level of leakage.

[0203] It can be understood that, when the number of consecutive occurrences of the target calculation cycle does not reach N times, if it is determined in the subsequent calculation cycle that the rate of decrease of the liquid level in the expansion device 12 is less than the first rate threshold, the number of occurrences of the target calculation cycle is cleared to determine that the number of consecutive occurrences of the target calculation cycle is 0 times.

[0204] Similarly, in the process of judging whether the coolant has leaked at a target leakage level by the amount of liquid level drop in the expansion device, the controller can determine that the coolant has leaked at the target leakage level after determining in N consecutive calculation cycles that the amount of liquid level drop is greater than or equal to the drop threshold corresponding to the target leakage level.

[0205] Wherein, N can be set according to the calculation cycle and the total leakage duration. For example, the total leakage duration corresponding to the first leakage level is t4. When the calculation cycle corresponding to the first leakage level is set to t1, a total of M leakage detections can be performed before the coolant fills up the liquid storage device 144. N may be set to an integer smaller than M. Similarly, the number of times N corresponding to the second leakage level and the third leakage level may be set.

[0206] In the embodiment of the present application, determining that the coolant is leaking when a coolant leak is detected in multiple consecutive calculation cycles can reduce the probability of misjudgment in the leak detection process, thereby improving the accuracy of the leak detection.

[0207] Fig. 9 FIG. 1 is a flow chart of a leakage detection method provided in an embodiment of the present application. Fig. 9 As shown, the leakage detection process includes steps 91 to 97.

[0208] Step 91: Obtain a first humidity value.

[0209] Step 92: Determine whether the first humidity value is not lower than the humidity threshold.

[0210] Step 93: Output an alarm signal corresponding to a slight leakage.

[0211] Step 94: Control the gas protection system to adjust the humidity.

[0212] In this embodiment, the controller can obtain a first humidity value in the gas protection system during the leakage detection process, and determine that a slight leakage of the coolant occurs when the obtained first humidity value is greater than or equal to the humidity threshold. After a slight leakage of the coolant occurs, step 93 can be executed to output an alarm signal corresponding to the slight leakage, and step 94 can be executed to control the gas protection system to adjust the humidity so that the humidity value in the gas protection system drops below the humidity threshold.

[0213] After determining that there is no slight leakage of the coolant, the process may return to step 91 to continue to determine whether there is a slight leakage of the coolant based on the humidity value in the gas protection system.

[0214] Step 95: Obtain the liquid level drop rate in the current calculation cycle.

[0215] Step 96: Determine whether the liquid level drop rate is not lower than the rate threshold corresponding to the target leakage level.

[0216] Step 97: output an alarm signal corresponding to the target leakage level.

[0217] In this embodiment, the controller can determine the liquid level drop rate of the expansion device within the current calculation cycle during the leakage detection process. When the liquid level drop rate is greater than or equal to a rate threshold corresponding to a certain leakage level, it is determined that the coolant has sent a leakage of the leakage level, and step 97 is executed to output an alarm signal corresponding to the leakage level.

[0218] It is understandable that, in the process of executing step 95 and step 96, different rate thresholds and calculation cycles may be set for each leakage level, and multiple leakage levels may be detected simultaneously or separately.

[0219] After determining that the coolant has not leaked at any leakage level, the process returns to step 85 to continue acquiring the liquid level drop rate in the current detection cycle, and determines whether the coolant has leaked based on the liquid level drop rate.

[0220] It should be noted that steps 91 to 92, and steps 95 to 96 can be performed simultaneously. When a certain leakage level of the coolant is detected, the execution of steps 91 and 92 can be stopped, and after restarting, the execution of steps 91 and 92 can be continued.

[0221] Fig.10 FIG. 1 is a schematic diagram showing the structure of a leakage detection device provided in an embodiment of the present application. Fig.10 As shown, the leakage detection device 10 includes an acquisition module 101 , a determination module 102 , a control module 103 and an output module 104 .

[0222] An acquisition module 101 is used to acquire a first humidity value in a gas protection system of a battery cabinet;

[0223] The determination module 102 is configured to determine that a coolant in a cooling system of the battery cabinet is leaking when the first humidity value is greater than or equal to a humidity threshold.

[0224] In one embodiment, the control module 103 is used to control the gas protection system to perform humidity adjustment so that the humidity value in the gas protection system is less than a humidity threshold value when a coolant leak is determined.

[0225] In one embodiment, a plurality of humidity sensors are provided in the gas protection system, and the acquisition module 101 is specifically used to determine a target humidity sensor that is not faulty from the plurality of humidity sensors; and to acquire a first humidity value from humidity values ​​collected by the target humidity sensor.

[0226] In one embodiment, a liquid level sensor is provided in the expansion device of the cooling system, and the determination module 102 is further used to determine the amount of liquid level drop in the expansion device during a current calculation cycle based on the detection value of the liquid level sensor, and each calculation cycle includes at least one sampling cycle of the liquid level sensor; and determine whether the coolant is leaking based on the amount of liquid level drop.

[0227] In one embodiment, the determination module 102 is specifically used to determine the coolant leakage of a target leakage level from multiple leakage levels according to the liquid level drop, the multiple leakage levels correspond to different leakage flow rates, and the higher the leakage level, the greater the leakage flow rate.

[0228] In one embodiment, the determination module 102 is specifically used to determine the rate of decrease of the liquid level in the expansion device during the current calculation cycle based on the amount of liquid level decrease; when the decrease rate is greater than or equal to a rate threshold, it is determined that the coolant has leaked at a target leakage level, and the rate threshold corresponds to the target leakage level.

[0229] In one embodiment, the determination module 102 is specifically configured to determine that the coolant has leaked at a target leakage level when the liquid level drop is greater than or equal to a drop threshold, and the drop threshold corresponds to the target leakage level.

[0230] In one embodiment, the determination module 102 is specifically used to determine the drop in the liquid level in the expansion device corresponding to each leakage level within a calculation cycle according to the detection value of the liquid level sensor. Different leakage levels correspond to different calculation cycles, and the lower the leakage level, the longer the calculation cycle.

[0231] In one embodiment, the output module 104 is configured to output an alarm signal corresponding to the target leakage level when it is determined that the coolant leaks at the target leakage level.

[0232] In one embodiment, the determination module 102 is specifically configured to determine a target liquid level sensor that is not faulty from a plurality of liquid level sensors; and determine the amount of liquid level drop according to the detection value of the target liquid level sensor.

[0233] Fig.11FIG. 1 shows a structural block diagram of a leakage detection device provided in an embodiment of the present application. Fig.11 As shown, the leakage detection device 11 includes a processor 111 and a memory 113 , and the above-mentioned components can be connected via one or more buses 114 .

[0234] The leakage detection device 11 further includes a computer program 112, which is stored in the memory 113. When the computer program 112 is executed by the processor 111, the leakage detection device 11 performs the above Figure 6 and Fig. 9 The leakage detection method shown in the figure. Among them, all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding physical device, and will not be repeated here.

[0235] An embodiment of the present application also provides a readable storage medium, which includes a computer program. When the computer program is executed on a computer, the computer executes the method provided by the above method embodiment.

[0236] An embodiment of the present application also provides a computer program product comprising instructions, and when the computer program product is run on a computer, the computer is enabled to execute the method provided by the above method embodiment.

[0237] An embodiment of the present application also provides a chip system, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a leakage detection device equipped with the chip system executes the method provided in the above method embodiment.

[0238] Among them, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0239] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0240] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0241] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0242] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0243] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0244] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0245] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0246] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0247] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An energy storage system, characterized in that: include: A controller and at least one battery cabinet, wherein the battery cabinet is connected to a cooling system and a gas protection system; A humidity sensor is provided in the gas protection system, and the humidity sensor is connected to the controller; The controller is used to obtain a first humidity value in the gas protection system through the humidity sensor, and determine that the coolant in the cooling system is leaking when the first humidity value is greater than or equal to a humidity threshold.

2. The energy storage system according to claim 1, characterized in that: The gas protection system includes a gas circulation device, the air inlet of the battery cabinet is connected to the air outlet of the gas circulation device through a gas circulation pipeline, and the exhaust port of the battery cabinet is connected to the air inlet of the gas circulation device through a gas circulation pipeline.

3. The energy storage system according to claim 2, characterized in that: The gas protection system also includes a three-way valve, which is arranged between the battery cabinet and the gas circulation device. The first end of the three-way valve is connected to the exhaust port of the battery cabinet through a gas circulation pipeline, the second end is connected to the air inlet of the gas circulation device through a gas circulation pipeline, and the third end is connected to the external environment.

4. The energy storage system according to claim 2, characterized in that: The gas protection system further comprises a gas supply device, and the gas supply device is connected to the gas inlet of the gas circulation device through a gas supply valve.

5. The energy storage system according to claim 1, characterized in that: A humidity regulating device is provided in the gas protection system, and the humidity regulating device is connected to the controller; The controller is also used to control the humidity adjustment device to adjust the humidity of the gas protection system when it is determined that the coolant is leaking, so that the humidity value in the gas protection system is less than the humidity threshold.

6. The energy storage system according to claim 1, characterized in that: There are multiple humidity sensors, and the controller is used to determine a target humidity sensor that is not faulty from the multiple humidity sensors, and obtain the first humidity value from the humidity values ​​collected by the target humidity sensor.

7. The energy storage system according to claim 1, characterized in that: The cooling system comprises a heat exchange device, a liquid circulation device and an expansion device. The heat exchange device, the liquid circulation device and the battery cabinet are connected in sequence through a liquid circulation pipeline, and the expansion device is connected in parallel with the liquid circulation device.

8. The energy storage system according to claim 7, characterized in that: A plurality of liquid level sensors are arranged in the expansion device, and the liquid level sensors are connected to the controller. The controller is also used to determine the coolant leakage according to the detection values ​​of the liquid level sensors.

9. A leak detection method, characterized in that: The method comprises: Obtaining a first humidity value in a gas protection system of a battery cabinet; When the first humidity value is greater than or equal to a humidity threshold, it is determined that there is a coolant leak in the cooling system of the battery cabinet.

10. The method according to claim 9, characterized in that The method further comprises: In the case where a coolant leak is determined, the gas protection system is controlled to perform humidity adjustment so that the humidity value in the gas protection system is less than the humidity threshold.

11. The method according to claim 9, characterized in that The gas protection system is provided with a plurality of humidity sensors, and the obtaining of a first humidity value in the gas protection system of the battery cabinet includes: determining a target humidity sensor that is not faulty from among the plurality of humidity sensors; The first humidity value is obtained from the humidity values ​​collected by the target humidity sensor.

12. The method according to any one of claims 9 to 11, characterized in that A liquid level sensor is provided in the expansion device of the cooling system, and the method further comprises: Determining a liquid level drop in the expansion device in a current calculation cycle according to a detection value of the liquid level sensor, each calculation cycle including at least one sampling cycle of the liquid level sensor; The occurrence of coolant leakage is determined based on the amount of drop in the liquid level.

13. The method according to claim 12, characterized in that The step of determining the coolant leakage according to the liquid level drop comprises: According to the liquid level drop, it is determined from a plurality of leakage levels that the coolant leaks at a target leakage level, wherein the plurality of leakage levels correspond to different leakage flow rates, and a higher leakage level means a greater leakage flow rate.

14. The method according to claim 13, characterized in that The step of determining the coolant leakage according to the liquid level drop comprises: Determining a decreasing rate of the liquid level in the expansion device during the current calculation cycle according to the liquid level decreasing amount; When the decreasing rate is greater than or equal to a rate threshold, it is determined that the coolant leaks at the target leakage level, and the rate threshold corresponds to the target leakage level.

15. The method according to claim 13, characterized in that The step of determining the coolant leakage according to the liquid level drop comprises: When the liquid level drop is greater than or equal to a drop threshold, it is determined that the coolant leaks at the target leakage level, and the drop threshold corresponds to the target leakage level.

16. The method according to claim 13, characterized in that Determining the liquid level drop amount of the liquid level in the expansion device in the current calculation cycle according to the detection value of the liquid level sensor includes: The drop amount of the liquid level in the expansion device corresponding to each leakage level within a calculation period is determined according to the detection value of the liquid level sensor. Different leakage levels correspond to different calculation periods, and the lower the leakage level, the longer the calculation period.

17. The method according to claim 13, characterized in that The method further comprises: When it is determined that the coolant is leaking at the target leakage level, an alarm signal corresponding to the target leakage level is output.

18. The method according to claim 12, characterized in that There are multiple liquid level sensors, and determining the liquid level drop amount of the liquid level in the expansion device in the current calculation cycle according to the detection values ​​of the liquid level sensors includes: determining a target liquid level sensor that has not failed from among the plurality of liquid level sensors; The liquid level drop amount is determined according to the detection value of the target liquid level sensor.

19. A leakage detection device, characterized in that: The device comprises: An acquisition module, used to acquire a first humidity value in a gas protection system of a battery cabinet; A determination module is used to determine that there is a coolant leak in the cooling system of the battery cabinet when the first humidity value is greater than or equal to a humidity threshold.

20. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed on the leakage detection device, the leakage detection device executes the method according to any one of claims 9 to 18.

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