Water leakage detection method

Abstract

The present invention relates to a water leakage detection method, comprising: a mode determination step of determining, by a mode determination unit, an operation mode of a cooling system on the basis of information received from the cooling system; a reference water level determination step in which a reference water level determination unit determines a reference water level of the cooling water storage tank in the operating mode determined in the mode determination step; a water leakage determination step in which a water leakage determination unit compares the reference water level determined in the reference water level determination step with the cooling water level of the cooling water storage tank measured in real time to determine whether water leakage occurs; and a notification step of providing water leakage information to the set terminal by a water leakage notification unit when it is determined that the water leakage has occurred in the water leakage determination step.

Description

Technical Field

[0001] The present invention relates to a water leakage detection method (method for leak detection) which can detect water leakage of a cooling system used in an energy storage system (ESS, Energy Storage System). Background Art

[0002] Energy storage system (ESS) is a technology that can store electrical energy and use it when needed later. It has the advantage of improving the stability of power supply.

[0003] The electric energy storage system described above uses a plurality of battery modules that can store electricity. Since the energy storage capacity and safety of the battery modules described above vary depending on the ambient temperature, the temperature of the battery modules is controlled by a cooling system in order to improve the performance of the energy storage system.

[0004] The cooling system circulates fluids such as cooling water to regulate temperature. When cooling water leaks, it may cause insulation damage and further lead to fire, so it is important to quickly detect cooling water leaks and take measures.

[0005] Existing water leakage detection adopts the form of detecting the pressure change of cooling water moving through the pipe. However, because the cooling system operates at a low pressure, it is actually very difficult to detect a tiny water leak through the pressure change.

[0006] Therefore, there is an urgent need to develop a new water leakage detection method that can more accurately detect water leakage occurring in the cooling system and quickly take countermeasures against the water leakage.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent document 1): Korean Patent Publication No. 10-2021-0128597 (Title: Battery protection device machine method, publication date: 2021.10.27)

[0010] Patent Document 2): Korean Registered Patent Gazette No. 10-2324254 (Title: Water Leakage Detection Device, Battery Pack and Automobile Including the Water Leakage Detection Device, Registration Date: 2021.11.03) Summary of the invention

[0011] The present invention aims to solve the above-mentioned existing problems, and the purpose of the present invention is to provide a water leakage detection method that can quickly grasp the water leakage phenomenon occurring in the cooling system and prevent accidents that may be caused by the water leakage.

[0012] In order to achieve the above-mentioned purpose, the water leakage detection method of the present invention is characterized in that it includes: a mode determination step S100, in which the mode determination unit determines the working mode of the cooling system 10 based on the information received from the cooling system 10; a reference water level determination step S200, in which the reference water level determination unit determines the reference water level of the cooling water storage tank 11 under the working mode determined in the mode determination step S100; a water leakage determination step S300, in which the water leakage determination unit compares the reference water level determined in the reference water level determination step S200 with the cooling water level of the cooling water storage tank 11 measured in real time, so as to determine whether there is a water leakage; and a notification step S400, in which, when it is determined that a water leakage has occurred in the water leakage determination step S300, the water leakage notification unit provides the water leakage information to the set terminal.

[0013] Furthermore, the present invention is characterized in that, in the mode determination step S100 , the operation mode is determined using control information received from a control device of the cooling system 10 or a change in the flow rate of cooling water circulating in the cooling system 10 .

[0014] In addition, the present invention is characterized in that: the reference water level determination step S200 includes: a mode change determination step S210 for determining whether the working mode of the cooling system 10 has changed; a first reference water level determination step S220, when it is determined in the mode change determination step S210 that the working mode remains stable, the reference water level is maintained at the currently set reference water level; and a second reference water level determination step S230, when it is determined in the mode change determination step S210 that the working mode has changed, the water level stabilization mode is maintained within the set time, and when the water level stabilization mode is completed, the cooling water level information of the cooling water storage tank 11 is collected within the set time, and the average value of the cooling water levels collected within the set time is determined as the reference water level.

[0015] In addition, the present invention is characterized in that: the water leakage determination step S300 includes: a difference value calculation step S310, calculating the difference value between the cooling water level of the cooling water storage tank 11 measured in real time and the reference water level determined in the reference water level determination step S200; a change rate calculation step S320, calculating the cooling water level change rate of the cooling water storage tank 11 measured in real time; and a determination step S330 based on the calculated value, when the difference value between the cooling water level calculated in the difference value calculation step S310 and the reference water level reaches a set value or above, or the cooling water level change rate calculated in the change rate calculation step S320 reaches a set value or above, it is determined that a water leakage has occurred, and the mode determination step S100 is executed when it is determined that no water leakage has occurred.

[0016] In addition, the present invention is characterized in that: the difference value calculation step S310 includes: a cooling water level measuring step S311, measuring the cooling water level of the cooling water storage tank 11 in real time; a cooling water temperature measuring step S312, measuring the cooling water temperature of the cooling system 10 in real time; a corrected water level calculation step S313, correcting the water level measured in the first cooling water level measuring step S311 based on the temperature measured in the first cooling water temperature measuring step S312, thereby calculating the corrected cooling water level; and a corrected difference value calculation step S314, calculating the difference value between the corrected cooling water level calculated in the first corrected water level calculation step S313 and the reference water level determined in the reference water level determination step S200.

[0017] Furthermore, the present invention is characterized in that the following mathematical formula 1 is used when calculating the corrected cooling water level in the corrected water level calculation step S313.

[0018] Mathematical formula 1

[0019] h1=h0-C*(t1–t0)

[0020] (h0: reference water level, h1: water level corrected according to cooling water temperature change, t0: reference temperature (temperature when the reference water level is measured), t1: current temperature, C: correction coefficient)

[0021] In addition, the present invention is characterized in that it also includes a water leakage detection device 1000 used in the water leakage detection method, and the water leakage detection device 1000 includes: a water level measuring component 100, which is combined with a cooling water storage tank 11 for storing cooling water, and measures the cooling water level on the cooling water storage tank 11; and a control unit 200, which receives cooling water level information from the water level measuring component 100, and is composed of the mode determination unit, the reference water level determination unit and the water leakage determination unit.

[0022] In addition, the present invention is characterized in that the water leakage detection device 1000 includes a cooling water flow restriction component 400 located at a position facing the cooling water inflow portion inside the cooling water storage tank 11 .

[0023] In addition, the present invention is characterized in that: the cooling water flow restriction component 400 includes: a restriction component shell 410, which is open in front of the cooling water inlet and has a cooling water outlet formed on the upper and lower sides; and a flow weakening protrusion 420 formed on the inner surface of the restriction component shell 410.

[0024] In addition, the present invention is characterized in that it further includes: an intermediate storage tank 600, which is combined with the upper side of the cooling water storage tank 11 and can allow cooling water circulating through the cooling system 10 to flow in; a first cooling water inflow hole 610 and a second cooling water inflow hole 11-1 are formed on the lower edge of the intermediate storage tank 600 and the upper edge of the cooling water storage tank 11 facing therefrom.

[0025] In addition, the present invention is characterized in that it includes: a cooling water drop path forming component, which is spirally coupled to the inner side surface of the cooling water storage tank 11.

[0026] The water leakage detection method of the present invention can detect water leakage by utilizing the change of the cooling water level in the cooling water storage tank, and therefore has a better water leakage detection capability than the existing method of detecting water leakage by utilizing pressure.

[0027] Furthermore, detected water leakage information can be provided to the administrator, so that the water leakage condition can be responded to quickly.

[0028] Furthermore, the reference water level can be determined using the average value of the water levels acquired within a certain period of time, so the determined reference water level has high reliability.

[0029] Furthermore, the reference water level can be reset each time the operating mode of the cooling water system is changed, thereby effectively coping with water level errors caused by mode changes.

[0030] In addition, the water level change due to temperature change can be compensated and reflected in the judgment of water leakage, so the judgment of water leakage can be made more accurately.

[0031] Furthermore, the cooling water flow restriction member can minimize the flow of cooling water contained in the tank due to the inflow of cooling water, so that the water level can be measured more accurately.

[0032] Furthermore, since the cooling water can be recovered in a form in which the cooling water flows toward the edge of the cooling water storage tank, the flow of the cooling water contained in the tank due to the inflow of the cooling water can be minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a sequence diagram illustrating the water leakage detection method of the present invention.

[0034] Figure 2 It is a sequence diagram that concretizes the reference water level determination step and the water leakage determination step of the water leakage detection method of the present invention.

[0035] Figure 3 It is a sequence diagram that concretizes the difference value calculation steps of the water leakage detection method of the present invention.

[0036] Figure 4 This is a conceptual diagram illustrating a water leakage detection device used in the water leakage detection method of the present invention.

[0037] Figure 5 This is a perspective view illustrating a cooling water flow restriction component of a water leakage detection device.

[0038] Figure 6 This is a conceptual diagram showing a state where an intermediate storage tank is coupled to a water leakage detection device.

[0039]

Explanation of symbols

[0040] S100: Mode determination step

[0041] S200: Reference water level determination step

[0042] S210: Mode change determination step

[0043] S220: First reference water level determination step

[0044] S230: Second reference water level determination step

[0045] S300: Water leakage determination steps

[0046] S310: Difference value calculation step

[0047] S311: Cooling water level measurement steps

[0048] S312: Cooling water temperature measurement step

[0049] S313: Correction of water level measurement steps

[0050] S314: Corrected difference value calculation step

[0051] S320: Change rate calculation step

[0052] S330: Decision step based on calculated value

[0053] S400: Notification step

[0054] 10: Cooling system

[0055] 11: Cooling water storage tank

[0056] 100: Water level measurement component

[0057] 200: Control Department

[0058] 300: Temperature measurement component

[0059] 400: Cooling water flow restriction assembly

[0060] 500: Water Leakage Notification Department DETAILED DESCRIPTION

[0061] The advantages and features of the embodiments of the present invention and the methods for achieving them will be further clarified by the subsequent embodiments which will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed in the following content, but can be implemented in a variety of different forms. These embodiments are only used to more completely disclose the present invention and to more completely introduce the scope of the present invention to those with general knowledge of the technical field to which the present invention belongs. The present invention should only be defined by the scope of the claims. Throughout the specification, the same reference numerals represent the same components.

[0062] In the process of describing the embodiments of the present invention, when it is determined that the specific description of a known function or structure may make the gist of the present invention unclear, the detailed description related to it will be omitted. In addition, the terms used subsequently are defined in consideration of the functions in the embodiments of the present invention, and may change due to the intention or convention of the user and the user. Therefore, it should be defined based on the overall content of the present invention.

[0063] Next, the water leakage detection method S1000 according to the present invention will be described with reference to the accompanying drawings.

[0064] Figure 1 is a sequence diagram illustrating the water leakage detection method of the present invention, Figure 2 This is a sequence diagram that embodies the reference water level determination step and the leakage determination step of the water leakage detection method of the present invention. Figure 3 is a sequence diagram that concretizes the difference value calculation steps of the water leakage detection method of the present invention. Figure 4 is a conceptual diagram illustrating a water leakage detection device used in the water leakage detection method of the present invention. Figure 5 is an oblique view illustrating a cooling water flow restriction component of a water leakage detection device, and Figure 6 This is a conceptual diagram showing a state where an intermediate storage tank is coupled to a water leakage detection device.

[0065] See also Figures 1 to 4 The water leakage detection method S1000 of the present invention may include: a mode determination step S100, in which the mode determination unit determines the working mode of the battery cooling system 10 based on the information received from the battery cooling system 10; a reference water level determination step S200, in which the reference water level determination unit determines the reference water level of the cooling water storage tank 11 of the working mode determined in the mode determination step S100; a water leakage determination step S300, in which the water leakage determination unit compares the reference water level determined in the reference water level determination step S200 with the cooling water level of the cooling water storage tank 11 measured in real time, thereby determining whether there is a water leakage; and a notification step S400, in which when it is determined that a water leakage has occurred in the water leakage determination step S300, the water leakage notification unit 500 provides water leakage information to the set terminal.

[0066] Specifically, energy storage systems (ESS) such as Figure 4 As shown, a plurality of battery modules 1 are used. As described above, the performance of the battery module 1 is affected by the ambient temperature. Therefore, the temperature of the space where the battery module 1 is arranged is maintained at a set value by the cooling system 10 .

[0067] At this time, if water leakage occurs in the pipe 2 through which the cooling water flows, the leaked cooling water may cause insulation breakdown and further lead to fire or the like, so it is necessary to quickly detect the occurrence of the water leakage and take countermeasures.

[0068] In order to solve the above-mentioned problem, a method of determining water leakage based on the pressure change of the cooling water flowing through the pipe 2 is currently adopted. However, since the battery cooling system operates at a low pressure, it is difficult to detect a weak water leakage.

[0069] Therefore, in the water leakage determination step S300 of the present invention, by comparing the reference water level determined in the reference water level determination step S200 with the cooling water level on the cooling water storage tank 11 measured in real time, water leakage can be determined more accurately and quickly.

[0070] Furthermore, since the cooling water level in the cooling water storage tank 11 may change according to the mode of the cooling system 10 , the reference water level needs to be measured again every time the mode of the cooling system 10 is changed.

[0071] At this time, the mode determination in the mode determination step S100 can be determined by the control information received from the control device of the cooling system 10 or the pressure change of the pipe 2 of the cooling system 10. More specifically, when the mode change information is received from the control device or the pressure measured in the pipe 2 changes by more than the set value, the mode determination unit can determine that the operating mode of the cooling system 10 has changed.

[0072] See also Figure 2 The reference water level determination step S200 includes: a mode change determination step S210 for determining whether the working mode of the cooling system 10 has changed; a first reference water level determination step S220, when it is determined in the mode change determination step S210 that the working mode remains stable, the reference water level is maintained at the currently set reference water level; and a second reference water level determination step S230, when it is determined in the mode change determination step S210 that the working mode has changed, the water level stabilization mode is maintained within the set time, and after completing the water level stabilization mode, the cooling water level information of the cooling water storage tank 11 is collected within the set time, and the average value of the cooling water levels collected within the set time is determined as the reference water level.

[0073] Specifically, when the mode of the cooling system 10 changes, the water level of the cooling water storage tank 11 will also change within a certain period of time. Therefore, in the case of a stable maintenance mode, the reference water level is determined by the first reference water level determination step S220, and when it is determined that the mode has changed, the reference water level is determined by the second reference water level determination step S230 including a water level stabilization mode.

[0074] In other words, because the amount of cooling water supplied from the pump P to the pipe 2 will also change when the operating mode of the cooling system 10 changes, the cooling water level in the cooling water storage tank 11 will tend to stabilize after completing the cycle of recovering the supplied cooling water when the operating mode changes, and before completing the cycle as described above, the cooling water level in the cooling water storage tank 11 will gradually change.

[0075] Therefore, when it is determined in the mode change determination step S210 that the working mode of the cooling system 10 remains stable, the previously determined reference water level will continue to be maintained in the first reference water level determination step S220, and when it is determined in the mode change determination step S200 that the working mode of the cooling system 10 has changed, the water level stabilization mode will be executed according to the changed working mode in the second reference water level determination step S230 until the supplied fluid is recovered, and the average value of the cooling water level measured within the set time thereafter will be determined as the reference water level.

[0076] At this time, the water level stabilization mode may be a mode of waiting without measuring the cooling water level, and the water level stabilization mode may be set to the time required to recover the supplied fluid according to the operation mode of the cooling system 10 after the change as described above.

[0077] In addition, when the previously determined reference water level is maintained in the first reference water level determination step S220, the reference water level is not remeasured separately, but the previously determined reference water level is directly used, and the initial reference water level can be input by the administrator, or determined by the initial reference water level determination step, or determined by the second reference water level determination step S230.

[0078] See also Figure 2 The water leakage determination step S300 may include: a difference value calculation step S310, calculating the difference value between the cooling water level of the cooling water storage tank 11 measured in real time and the reference water level determined in the reference water level determination step S200; a change rate calculation step S320, calculating the change rate of the cooling water level of the cooling water storage tank 11 measured in real time; and a determination step S330 based on the calculated value, determining that a water leakage has occurred when the difference value between the cooling water level calculated in the difference value calculation step S310 and the reference water level reaches a set value or above, or the cooling water level change rate calculated in the change rate calculation step S320 reaches a set value or above, and executing the mode determination step S100 when it is determined that no water leakage has occurred.

[0079] Specifically, because the cooling water level will also change when a water leakage occurs, after calculating the difference value based on the cooling water level change through the difference value calculation step S310 and calculating the cooling water level change rate through the change rate calculation step S320, when it is confirmed that the cooling water level has changed because the calculated difference value and the change rate exceed the set values, it can be determined that a water leakage has occurred in the decision step S330 based on the calculated value and the notification step S400 is executed.

[0080] Furthermore, when it is determined that no water leakage has occurred, the mode determination step S100 is re-executed to continuously perform subsequent determinations.

[0081] See also Figure 3 as well as Figure 4 The difference value calculation step S310 may include: a cooling water level measuring step S311, measuring the cooling water level of the cooling water storage tank 11 in real time; a cooling water temperature measuring step S312, measuring the cooling water temperature of the cooling system 10 in real time; a corrected water level calculation step S313, correcting the water level measured in the first cooling water level measuring step S311 based on the temperature measured in the first cooling water temperature measuring step S312, thereby calculating the corrected cooling water level; and a corrected difference value calculation step S314, calculating the difference value between the corrected cooling water level calculated in the first corrected water level calculation step S313 and the reference water level determined in the reference water level determination step S200.

[0082] Specifically, when the cooling water on the pipe 2 that is heated during the heat exchange process flows into the interior of the storage tank 11, the cooling water level (the water level that changes due to temperature) will cause an increase and thus form a large difference with the reference water level. Therefore, the cooling water level (the water level that changes due to temperature) will be corrected based on the temperature and the corrected water level will be calculated. The corrected water level (corrected water level) will be used to determine water leakage.

[0083] At this time, the cooling water level measurement in the water level measurement step S311 is as follows: Figure 4 As shown, it can be performed by a water level measuring component 100 installed in the cooling water storage tank 11, and the temperature measurement in the temperature measuring step S312 can be performed by a temperature measuring component 300 installed in the cooling water storage tank 11 or installed on the pipeline 2.

[0084] In addition, the calculation of the corrected cooling water level in the corrected water level calculation step S313 may be performed by the following mathematical formula 1, and the corrected cooling water level as described above may be used for the calculation of the difference value in the corrected difference value calculation step S314.

[0085] Mathematical formula 1:

[0086] h1=h0-C*(t1–t0)

[0087] (h0: reference water level, h1: water level corrected according to cooling water temperature change, t0: reference temperature (temperature when the reference water level is measured), t1: current temperature, C: correction coefficient)

[0088] In addition, the reference temperature may be an average value of the temperatures measured at the time points when the cooling water level used to determine the reference water level is measured. The temperature measurement may be performed at a certain position specified by the user. Figure 4 As shown, when the temperature is measured by a plurality of temperature measuring components 300 , an average value of the temperature measured by the plurality of temperature measuring components 300 may be used as the measured temperature value.

[0089] See also Figure 4 as well as Figure 5 The present invention may further include: a water leakage detection device 1000, used in the water leakage detection method S1000; the water leakage detection device 1000 may include: a water level measuring component 100, coupled to a cooling water storage tank 11 for storing cooling water, for measuring the cooling water level on the cooling water storage tank 11; and a control unit 200, which receives cooling water level information from the water level measuring component 100 and is composed of a mode determination unit 210, a reference water level determination unit 220 and a water leakage determination unit 230.

[0090] In addition, the present invention may further include: a cooling water flow restriction component 400 located inside the cooling water storage tank 11 at a position facing the cooling water inflow portion.

[0091] Specifically, when the flow of cooling water inside the storage tank 11 intensifies due to the fluid flowing in through the pump P, the water level may not be accurately measured by the water level measuring component 100. Therefore, the flow restriction component 400 is used to reduce the fluidity (flow rate) of the cooling water flowing into the storage tank 11.

[0092] At this time, the cooling water flow restriction component 400 may be a structure having a porous structure, but Figure 5 As shown, it can also be a device with a box structure including a limiting component shell 410 that is open on the front side facing the cooling water inlet and has cooling water outlets formed on the upper and lower sides, and a flow weakening protrusion 420 formed on the inner side surface of the limiting component shell 410.

[0093] In addition, when the cooling water flow restriction assembly 400 adopts a box structure, it is recommended to adopt a triangular cross-sectional shape in the flow weakening protrusion 420, so as to reduce the flow velocity of the contacted cooling water during the process of diffusing to the left and right, and move through the cooling water outlet 411 after reducing the flow velocity.

[0094] In addition, the cooling water flow restriction component 400 adopting a box structure can be tightly coupled to the inner side surface of the cooling water storage tank 11 formed with a cooling water inflow pipe coupling hole, and a cooling water discharge port 411 is formed on the lower side of the restriction component shell 410, so that the cooling water can be discharged after the fluidity of the cooling water is further reduced.

[0095] See also Figure 6 The water leakage detection device S1000 of the present invention may further include: an intermediate storage tank 600, which is coupled to the upper side of the cooling water storage tank 11 and can allow cooling water circulating through the cooling system 10 to flow in; a first cooling water inflow hole 610 and a second cooling water inflow hole 11-1 may be formed at the lower edge of the intermediate storage tank 600 and the upper edge of the cooling water storage tank 11 facing thereto.

[0096] Specifically, the cooling water circulating in the cooling system 10 flows into the cooling water storage tank 11 during the inflow process, so an intermediate storage tank 600 is formed on the upper side of the cooling water storage tank 11 for the recovered cooling water to flow through, and then a first cooling water inflow hole 610 and a second cooling water inflow hole 11-1 are formed on the lower edge of the intermediate storage tank 600 and the upper side of the cooling water storage tank 11 for the cooling water to flow in, so that the cooling water flowing into the intermediate storage tank 600 can flow into the cooling water storage tank 11 in the form of descending along the inside of the cooling water storage tank 11 after passing through the first cooling water inflow hole 610 and the second cooling water inflow hole 11-1.

[0097] In addition, there may be cooling water that does not flow down along the inner wall of the cooling water storage tank 11, so a spiral cooling water drop path forming component can be combined with the inner side surface of the cooling water storage tank 11, so that the cooling water moves downward along the cooling water drop path forming component.

[0098] The present invention is not limited to the embodiments described above, but can be applied to various fields. Personnel with general knowledge in the technical field to which the present invention belongs can make various modifications without departing from the scope of the present invention as claimed in the claims.

Claims

1. A water leakage detection method, wherein: include: A mode determination step (S100), in which a mode determination unit determines an operating mode of the cooling system (10) based on information received from the cooling system (10); a reference water level determination step (S200), in which a reference water level determination unit determines a reference water level of the cooling water storage tank (11) in the operation mode determined in the mode determination step (S100); a water leakage determination step (S300), in which a water leakage determination unit compares the reference water level determined in the reference water level determination step (S200) with the cooling water level of the cooling water storage tank (11) measured in real time, thereby determining whether there is a water leakage; as well as The notification step (S400) is to provide water leakage information to a set terminal by a water leakage notification unit when it is determined that water leakage has occurred in the water leakage determination step (S300).

2. The water leakage detection method according to claim 1, wherein: In the mode determination step (S100), the operation mode is determined using control information received from a control device of the cooling system (10) or a change in the flow rate of cooling water circulating in the cooling system (10).

3. The water leakage detection method according to claim 1, wherein: The reference water level determination step (S200) includes: a mode change determination step (S210), determining whether the operating mode of the cooling system (10) has been changed; a first reference water level determination step (S220), in which, when it is determined in the mode change determination step (S210) that the working mode remains stable, the reference water level is maintained at the currently set reference water level; and The second reference water level determination step (S230) is to maintain the water level stabilization mode within the set time when it is determined in the mode change determination step (S210) that the working mode has changed, and to collect the cooling water level information of the cooling water storage tank (11) within the set time when the water level stabilization mode is completed, and to determine the average value of the cooling water levels collected within the set time as the reference water level.

4. The water leakage detection method according to claim 1, wherein: The water leakage determination step (S300) comprises: a difference value calculation step (S310), calculating a difference value between the cooling water level of the cooling water storage tank (11) measured in real time and the reference water level determined in the reference water level determination step (S200); A change rate calculation step (S320) is to calculate the change rate of the cooling water level of the cooling water storage tank (11) measured in real time; and In the decision step (S330) based on the calculated value, when the difference between the cooling water level calculated in the difference value calculation step (S310) and the reference water level reaches a set value or above, or the cooling water level change rate calculated in the change rate calculation step (S320) reaches a set value or above, it is determined that a water leakage has occurred, and when it is determined that no water leakage has occurred, the mode determination step (S100) is executed.

5. The water leakage detection method according to claim 4, wherein: The difference value calculation step (S310) includes: A cooling water level measuring step (S311) measures the cooling water level of the cooling water storage tank (11) in real time; A cooling water temperature measuring step (S312), measuring the cooling water temperature of the cooling system (10) in real time; a corrected water level calculation step (S313), in which the water level measured in the first cooling water level measurement step (S311) is corrected based on the temperature measured in the first cooling water temperature measurement step (S312), thereby calculating a corrected cooling water level; and The corrected difference value calculation step (S314) calculates the difference value between the corrected cooling water level calculated in the first corrected water level calculation step (S313) and the reference water level determined in the reference water level determination step (S200).

6. The water leakage detection method according to claim 5, wherein: In the corrected water level calculation step (S313), the following mathematical formula 1 is used to calculate the corrected cooling water level: Mathematical formula 1 h1=h0-C*(t1–t0) h0: base water level, h 1: Water level corrected according to the change in cooling water temperature, t0: reference temperature, i.e. the temperature when measuring the reference water level, t 1: current temperature, C: Correction coefficient.

7. The water leakage detection method according to claim 1, wherein: Also included is a water leakage detection device (1000) used in the water leakage detection method, The water leakage detection device (1000) comprises: A water level measuring component (100) is coupled to a cooling water storage tank (11) for storing cooling water, and measures the cooling water level on the cooling water storage tank (11); and The control unit (200) receives the cooling water level information from the water level measuring component (100), and is composed of the mode determination unit, the reference water level determination unit, and the water leakage determination unit.

8. The water leakage detection method according to claim 7, wherein: The water leakage detection device (1000) comprises: The cooling water flow restriction component (400) is located inside the cooling water storage tank (11) at a position facing the cooling water inflow portion.

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