Method for measuring volume of flow path for stack

Abstract

A method for measuring the volume of a stack flow path according to some embodiments of the present invention comprises: connecting any one of the cooling water flow path, hydrogen flow path, and air flow path of a fuel cell stack, which includes a cooling water flow path configured to allow cooling water to flow, a hydrogen flow path configured to allow hydrogen to flow, and an air flow path configured to allow air to flow, to a reference tank; closing the outlet of the arbitrary flow path and pressurizing the reference tank and the arbitrary flow path to have an initial pressure; opening the outlet of the arbitrary flow path and discharging a specific flow rate from the arbitrary flow path for a preset time; measuring the end pressure of the reference tank and the arbitrary flow path after the preset time has elapsed; and calculating the volume of the arbitrary flow path based on the specific flow rate, the initial pressure, and the end pressure.

Description

Technology Field

[0001] The present invention relates to a fuel cell stack, and more specifically, to a stack flow path volume measuring system and measuring method capable of measuring the flow paths of cooling water, air, and hydrogen formed in the stack. Background Technology

[0002] Hydrogen electric vehicles that use hydrogen as fuel generate propulsion by driving a motor using the electric charge produced by reacting hydrogen with oxygen.

[0003] Hydrogen electric vehicles are equipped with a component called a stack to generate electricity from hydrogen. The stack is formed by stacking hundreds or more Electricity-Generating Assemblies (EGAs) and separators, and the EGA includes a Membrane Electrode Assembly (MEA) and a Gas Diffusion Layer (GDL).

[0004] The stack contains three flow paths for hydrogen, air, and coolant, each configured according to the shape of the separator plate. Since the volume of each flow path is difficult to measure in real-world measurements, it is calculated based solely on design dimensions, and the actual supply flow rate is determined based on these calculated figures. However, variations exist within individual components, and the presence of the gas diffusion layer makes it difficult to measure the actual volume of the flow paths. Prior art literature

[0005] Registered Patent Publication No. 10-1241947 (Registration Date: 2013.03.05) The problem to be solved

[0006] The present invention has been devised to solve the aforementioned problems, and

[0007] The purpose is to provide a measurement system and a measurement method capable of measuring the volumes of the coolant passage, air passage, and hydrogen passage of a completed stack.

[0008] The objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives will be clearly understood by those skilled in the art to which the present invention pertains (hereinafter referred to as "person skilled in the art") from the description below. means of solving the problem

[0009] The features of the present invention for achieving the objectives of the present invention as described above and for performing the characteristic functions of the present invention described below are as follows.

[0010] A method for measuring the volume of a stack flow path according to some embodiments of the present invention comprises: connecting any one of the cooling water flow path, hydrogen flow path, and air flow path of a fuel cell stack, which includes a cooling water flow path configured to allow cooling water to flow, a hydrogen flow path configured to allow hydrogen to flow, and an air flow path configured to allow air to flow, to a reference tank; closing the outlet of the arbitrary flow path and pressurizing the reference tank and the arbitrary flow path to have an initial pressure; opening the outlet of the arbitrary flow path and discharging a specific flow rate from the arbitrary flow path for a preset time; measuring the end pressure of the reference tank and the arbitrary flow path after the preset time has elapsed; and calculating the volume of the arbitrary flow path based on the specific flow rate, the initial pressure, and the end pressure.

[0011] According to some embodiments of the present invention, a stack flow path volume measuring system comprises: a reference tank having a fixed volume configured to selectively communicate with a cooling water flow path, an air flow path, or a hydrogen flow path of a stack; a pressure gauge configured to measure a specific flow path communicating with the reference tank among the flow paths and the pressure of the reference tank; and a flow meter provided on the outlet side of the specific flow path and configured to measure and control the flow rate discharged from the specific flow path. Effects of the invention

[0012] According to the present invention, a measuring system and a measuring method capable of measuring the volumes of the cooling water passage, air passage, and hydrogen passage of a completed stack are provided.

[0013] The effects of the present invention are not limited to those described above, and other unmentioned effects will be clearly recognized by a person skilled in the art from the description below. Brief explanation of the drawing

[0014] FIG. 1 schematically illustrates a fuel cell stack, and FIG. 2 illustrates a configuration diagram of a stack flow path volume measurement system according to the present invention, and FIG. 3 illustrates the measurement of a cooling water flow path according to some embodiments of the present invention, and FIG. 4 illustrates the measurement of an air passage according to some embodiments of the present invention, and FIG. 5 illustrates the measurement of a hydrogen flow path according to some embodiments of the present invention. Specific details for implementing the invention

[0015] The specific structural or functional descriptions presented in the embodiments of the invention are merely illustrative for the purpose of explaining embodiments according to the concept of the invention, and embodiments according to the concept of the invention may be implemented in various forms. Furthermore, it should not be interpreted as being limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0016] Meanwhile, in the present invention, terms such as "first" and / or "second" may be used to describe various components, but said components are not limited to said terms. For the sole purpose of distinguishing one component from other components, for example, without departing from the scope of rights according to the concept of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0017] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. Conversely, when it is stated that one component is "directly connected" or "directly in contact" with another component, it should be understood that there are no other components in between. Other expressions used to describe the relationship between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same way.

[0018] Throughout the specification, identical reference numbers denote identical components. Meanwhile, the terms used in this specification are for describing embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used in this specification, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0020] The present invention will be described in detail below with reference to the attached drawings.

[0021] As shown in FIG. 1, the fuel cell stack (S) includes an EGA (2) and bipolar plates (4a, 4b). The EGA includes an MEA (12) and a GDL (22), and the GDL (22) is provided on each side of the MEA (12) with the MEA (12) in between.

[0022] Separator plates (4a, 4b) are disposed on the outer side of each GDL (22), and the separator plates (4a, 4b) include a hydrogen electrode separator plate (4a) and an air electrode separator plate (4b). An air electrode separator plate (4b) is disposed on one side of the EGA (2), and a hydrogen electrode separator plate (4a) is provided on the other side of the EGA (2).

[0023] In the stack (S), a cooling water channel (40) configured to allow cooling water to flow, an air channel (50) configured to allow air to flow, and a hydrogen channel (60) configured to allow hydrogen to flow are provided. On the surface where the air electrode separator (4b) meets the EGA (2) and on the surface where the hydrogen electrode separator (4a) meets the EGA (2), an air channel (50) and a hydrogen channel (60) are formed, respectively. On the surface where the separator plates (4a, 4b) meet each other, that is, on the surface where the hydrogen electrode separator (4a) meets the air electrode separator (4b), a cooling water channel (40) through which cooling water flows is provided.

[0024] Such stacks (S) are fastened with a fastening load in tons, in accordance with the design cell pitch.

[0025] The flow paths of the stack (S) are complexly configured to ensure that the reaction proceeds smoothly in the case of the reaction gas and to obtain an effective cooling effect in the case of the cooling water. Additionally, a gas diffusion layer, GDL (22), is in contact with the reaction gas flow paths (50, 60). Due to the structural characteristics of the stack (S), it is not easy to accurately measure the volume of each flow path, such as the cooling water flow path (40), the air flow path (50), and the hydrogen flow path (60). While it is possible to calculate the volume before assembly using the design dimensions of each individual part, calculating the volume after assembly is analytically difficult. Accuracy is reduced because there are many factors to consider, such as the deformation of each individual part due to the assembly load and the porosity of the GDL. Furthermore, there is a membrane permeation phenomenon called crossover between the air flow path (50) and the hydrogen flow path (60), which makes actual measurement even more difficult.

[0026] For this reason, the current development process generally involves measuring the volume of the flow channel through modeling using design dimensions before the fastening load is applied, performing analysis based on this measured volume, and finalizing the appropriate flow rate value through selection and evaluation.

[0027] Accordingly, the present invention aims to provide a method for measuring the volumes of the cooling water flow path (40), air flow path (50), and hydrogen flow path (60) of a completed stack (S). According to the present invention, it is possible to calculate the actual appropriate flow rate during the development stage, manage deviations between completed stacks during the mass production stage, and furthermore, secure basic data that enables customized setting of the operating flow rate for each stack.

[0028] As illustrated in FIGS. 2 to 5, the stack flow volume measuring system according to the present invention may include a reference tank (10), a pressure gauge (20), and a flow meter (30).

[0029] The reference tank (10) has a fixed volume and is connected to the fuel cell stack (S). More specifically, the reference tank (10) is configured to be connectable or communicating with the cooling water path (40), air path (50), or hydrogen path (60) within the fuel cell stack (S).

[0030] The pressure gauge (20) can measure the pressure of the reference tank (10). That is, the pressure gauge (20) can measure the pressure of the cooling water path (40), air path (50), or hydrogen path (60) configured to communicate with the reference tank (10).

[0031] A flow meter (30) is provided at the outlet side of each of the cooling water path (40), air path (50), or hydrogen path (60). Each flow meter (30a, 30b, 30c) is provided in each of the cooling water path (40), air path (50), and hydrogen path (60) and is configured to measure and control the flow rate of the fluid in each path. As a non-limiting example, the flow meter (30) may be a mass flow controller (MFC) capable of measuring and controlling the flow of the fluid.

[0032] The stack (S) is provided with a cooling water passage (40), an air passage (50), and a hydrogen passage (60).

[0033] The cooling water channel (40) is configured to allow cooling water to flow for temperature control of the stack (S), and the cooling water channel (40) includes a cooling water inlet (140) into which cooling water for cooling the unit cells of the stack (S) flows, and a cooling water outlet (240) into which cooling water is discharged from the cooling water channel (40) after passing through the unit cells. That is, there is no restriction on the location of the cooling water inlet (140) and the cooling water outlet (240) within the stack (S), the cooling water inlet (140) is the point where cooling water flows into the cooling water channel (40), and the cooling water outlet (240) is the point where cooling water comes out of the cooling water channel (40). Accordingly, the volume of the cooling water channel (40) formed through the cooling water inlet (140) to the cooling water outlet (240) in this specification may refer to the total volume of the cooling water channel within the stack (S).

[0034] The air passage (50) is configured to allow the reaction gas, air (oxygen), to flow through it and includes an air inlet (150) into which air is introduced and an air outlet (250) into which air passing through the air passage (50) is discharged. Similar to the cooling water inlet (140) and cooling water outlet (240), there is no restriction on the location of the air inlet (150) and the air outlet (250) within the stack (S), and the air inlet (150) is the point where air is introduced into the air passage (50), and the air outlet (250) is the point where air is discharged from the air passage (50). Accordingly, the volume of the air passage (50) formed through the air inlet (150) to the air outlet (250) in this specification may refer to the total volume of the air passage within the stack (S).

[0035] The hydrogen flow path (60) is configured to allow hydrogen, which is a reaction gas, to flow, and includes a hydrogen inlet (160) into which hydrogen is introduced and a hydrogen outlet (250) into which hydrogen that has passed through the hydrogen flow path (60) is discharged. As with the case of the cooling water flow path (40) and the air flow path (50), there is no restriction on the location of the hydrogen inlet (160) and the hydrogen outlet (260) within the stack (S), and the hydrogen inlet (160) is the point where hydrogen is introduced into the hydrogen flow path (60), and the hydrogen outlet (260) is the point where hydrogen is discharged from the hydrogen flow path (60). Accordingly, the volume of the hydrogen flow path (60) formed through the hydrogen inlet (160) to the hydrogen outlet (260) in this specification may refer to the total volume of the hydrogen flow path within the stack (S).

[0036] The stack flow path volume measurement method according to the present invention may include measuring the volume of the cooling water flow path, measuring the volume of the air flow path, and measuring the volume of the hydrogen flow path.

[0037] Referring to FIG. 3, the measurement of the volume of the cooling water flow path according to some embodiments of the present invention can be performed as follows.

[0038] First, the cooling water passage (40) is connected to the reference tank (10). More specifically, the cooling water inlet (140) and the reference tank (10) can be connected. Thus, the cooling water passage (40) and the reference tank (10) are configured to be in fluid communication. At this time, the air inlet (150), hydrogen inlet (160), air outlet (250), and hydrogen outlet (260) are closed or the flow is blocked.

[0039] In this state, the cooling water outlet (240) is closed, and the initial pressure (P) in the reference tank (10) connected to the cooling water path (40) is applied. w0 ) applies. That is, the pressure of the reference tank (10) and the cooling water path (40) communicating with the reference tank (10) is the initial pressure (P w0 ...is made to be ). Meanwhile, pressurization can be performed by a known method, and the applied initial pressure (P w0 ) can be measured through a pressure gauge (20).

[0040] Initial pressure (P w0 The initial time point (t) which is the point in time when ) is reached w0 The cooling water outlet (240) is opened, and a specific flow rate (F) is maintained through the cooling water outlet (240) for a preset time. w It emits ). That is, the initial time point (t w0 The end point (t) which is the point in time after a preset time has elapsed from ) w1 Up to a specific flow rate (F w Discharges ).

[0041] The end point (t) when the above preset time has elapsed w1 When ) is reached, the end point (t w1 Termination pressure (P) of ) w1 ) is measured. The pressure of the reference tank (10) and the cooling water path (40) is at an initial time (t w0 From ) to the end time (t w1 A specific flow rate (F) discharged up to ) w Termination pressure (P) by ) w1 Reaching ), termination pressure (P w1 ) is the initial pressure (Pw0 It becomes smaller than ).

[0042] Here, based on Boyle's law that the pressure and volume of a gas are inversely proportional when the temperature of the gas is constant, the volume (V) of the cooling water channel (40) w ) can be estimated as in mathematical formula 1.

[0043] [Mathematical Formula 1]

[0044]

[0045] Here, V r is the volume of the standard tank (10), and P atm is atmospheric pressure, and t is time. That is, the volume discharged to the outside from the reference tank (10) and the cooling water path (40) is at the initial time (t w0 From ) to the end time (t w1 This means that it is equal to the sum of the flow rates discharged up to ). Mathematical Equation 1 is the volume (V) of the cooling water path (40). w By rearranging for ), we can obtain mathematical equation 2.

[0046] [Mathematical Formula 2]

[0047]

[0048] I will explain with a specific example. r Assuming the capacity is 10 liters (L), the reference tank (10) is connected to the cooling water inlet (140). After closing the cooling water outlet (240), P atm A pressure four times the value of (assumed to be 1 atm) is applied. Then, using a flow meter (30a) provided at the cooling water outlet (240), a flow rate of 1 liter per minute (LPM) is discharged for 20 minutes. After 20 minutes, the end pressure (P w1 ) is P atm If it is measured as three times the amount, then the 20L of gas discharged is 10L discharged from the cooling water channel (40) excluding the 10L discharged from the reference tank (10), so it can be seen that the volume of the cooling water channel (40) is 10L.

[0049] A method for measuring the volume of an air passage (50) according to some embodiments of the present invention will be explained with reference to FIG. 4.

[0050] The air passage (50) is connected to the reference tank (10). Specifically, the air inlet (150), through which air is supplied to the air passage (50), is connected to or communicates with the reference tank (10). At this time, the cooling water inlet (140), cooling water outlet (240), hydrogen inlet (160), and hydrogen outlet (260) are closed or the flow is blocked.

[0051] In this state, the air outlet (250) is closed and the initial pressure (P) in the reference tank (10) and the air passage (50) is applied. c0 ) is applied. In other words, the pressure of the reference tank (10) and the air passage (50) communicating with the reference tank (10) is the initial pressure (P c0 ...to reach ). Applied initial pressure (P c0 ) can be measured through a pressure gauge (20).

[0052] Initial pressure (P c0 The initial time point (t) which is the point in time when ) is reached c0 An air outlet (250) is opened to ), and a specific flow rate (F) is supplied through the air outlet (250) for a set time. c The flow meter (30b) is controlled to discharge ). That is, at the initial time (t c0 The end point (t) which is the point in time after a preset time has elapsed from ) c1 Up to a specific flow rate (F c ) discharges. However, in the case of the air passage (50) or hydrogen passage (60), unlike the cooling water passage (40) which is configured independently, a crossover phenomenon occurs, so additional factors are considered. Crossover flow rate (C c To consider ), the initial time point (t c0 When ) is reached, the hydrogen outlet (260) is also opened and the initial time point (t) c0 From ) to the end time (t c1The flow rate discharged through the hydrogen outlet (260) up to ) is measured. The crossover flow rate (C) discharged through the hydrogen outlet (260) c ) can be measured through a flow meter (30c) provided on the side of the hydrogen outlet (260). In particular, the hydrogen outlet (260) is closed at the beginning of the measurement, and then the crossover flow rate (C c If the hydrogen outlet (260) is configured to discharge when measuring, the accuracy of the measurement can be improved.

[0053] End point (t c1 Termination pressure (P) of ) c1 ) is measured. Initial time point (t c0 From ) to the end time (t c1 After the time up to ) has passed, the pressure of the reference tank (10) and the air passage (50) is at the initial time (t c0 From ) to the end time (t c1 A specific flow rate (F) discharged up to ) c Termination pressure (P) by ) c1 Reaching ), termination pressure (P c1 ) is the initial pressure (P c0 It becomes smaller than ).

[0054] Just as with the case of the coolant passage (40), the volume (V) of the air passage (50) according to Boyle's Law c ) can be estimated. That is, it is given as in Equation 3.

[0055] [Mathematical Formula 3]

[0056]

[0057] That is, the initial time point (t c0 From ) to the end time (t c1 The volume discharged to the outside from the reference tank (10) and the air passage (50) up to ) is equal to the sum of the flow rate discharged from the air passage (50) and the crossover flow rate, respectively, during that time. Equation 3 represents the volume (V) of the air passage (50). c When rearranging for ), it is as shown in mathematical equation 4 below.

[0058] [Mathematical Formula 4]

[0059]

[0060] For example, a 10L standard tank (10) is connected to the air inlet (150) of the air passage (50), and the air outlet (250) is closed. P in the air passage (50), including the standard tank (10) atm Four times the pressure is applied. Next, a flow rate of 1 LPM is discharged through the air outlet (250) via a flow meter (30b) positioned on the side of the air outlet (250). At this time, the hydrogen outlet (260) is also opened, and the crossover flow rate discharged through the hydrogen outlet (260) is measured. In this example, the discharged crossover flow rate (C c Assume that ) is 2 LPM. After 10 minutes have elapsed, the pressure is P atm If it has become three times the level, the volume (V) of the air passage (50) due to the 30L of gas that escaped during 10 minutes c ) can be estimated as 20L.

[0061] As illustrated in FIG. 5, the method for measuring the volume of a hydrogen flow path (60) according to some embodiments of the present invention is substantially the same as that of an air flow path (50).

[0062] To briefly explain, the reference tank (10) is connected to the hydrogen flow path (60). The hydrogen outlet (260) is closed and the initial pressure (P a0 Apply ). Initial pressure (P a0 The initial time point (t) reached a0 Open the hydrogen outlet (260) at the end time (t) a1 Up to a specific flow rate (F a ) is discharged. At this time, in order to consider the crossover flow rate to the air passage (50), the air outlet (250) is opened and the crossover flow rate (C) discharged through the air outlet (250) a Measures ). Termination time (t a1 When ) is reached, the termination pressure (P a1Measures ).

[0063] As with the volume measurement of the air passage (50), the flow of the coolant inlet (140), coolant outlet (240), air inlet (150), and air outlet (250) is blocked during the initial volume measurement of the hydrogen passage (60). Here, too, the air outlet (250) is kept closed during the initial period, and then the crossover flow rate (C a It can be opened during the measurement of ). When configured in this way, the accuracy of the measurement can be improved.

[0064] In the same way as the air channel (60), as in Equation 5, the volume (V) of the hydrogen channel (60) a ) can be calculated.

[0065] [Mathematical Formula 5]

[0066]

[0067] In the above embodiment, the volume (V) of the air passage (50) c ) and the volume (V) of the hydrogen flow path (60) a In the case of ) measurement, the crossover flow rate was summed. According to some embodiments of the present invention, a method of not summing the crossover flow rate is used. For example, when measuring the volume of the hydrogen flow path (60), the same pressure as the hydrogen flow path (60) is formed in the air flow path (50) so that no crossover occurs from the hydrogen flow path (60) to the air flow path (50). The pressure of the hydrogen flow path (60) at an initial time (t a0 From ) to the end time (t a1 P up to ) a0 In P a1 When changing to, the air passage (50) also at the initial point (t a0 From ) to the end time (t a1 P up to ) a0 In P a1 The pressure of the air passage (50) is adjusted separately to follow the air passage (50). This can also be applied when measuring the volume of the air passage (50).

[0068] According to the present invention, by enabling the measurement of the flow path volume of a stack that has been completed, the actual value of the flow path volume can be known, and thus, it is possible to secure flow path design factors.

[0069] In addition, according to the present invention, since it is possible to check for deviations in the volume of the Euro, deviations in components such as separators and GDLs can be immediately recognized, thereby contributing to quality improvement.

[0070] The present invention described above is not limited by the aforementioned embodiments and attached drawings, and it will be obvious to those skilled in the art that various substitutions, modifications, and changes are possible within the scope of the technical concept of the present invention. Explanation of the symbols

[0071] 2: EGA 4a, 4b: Separator 10: Standard Tank 12: MEA 20: Pressure gauge 22: GDL 30: Flow meter 40: Cooling water path 50: Air Euro 60: Hydrogen Euro 140: Coolant inlet 150: Air inlet 160: Hydrogen inlet 240: Coolant outlet 250: Air outlet 260: Hydrogen outlet

Claims

Claim 1 A method for measuring stack flow path volume comprising: connecting any one of the cooling water path, hydrogen path, and air path of a fuel cell stack, which includes a cooling water path configured to allow cooling water to flow, a hydrogen path configured to allow hydrogen to flow, and an air path configured to allow air to flow, to a reference tank; closing the outlet of the arbitrary path and pressurizing the reference tank and the arbitrary path to have an initial pressure; opening the outlet of the arbitrary path and discharging a specific flow rate from the arbitrary path for a preset time; measuring the end pressure of the reference tank and the arbitrary path after the preset time has elapsed; and calculating the volume of the arbitrary path based on the specific flow rate, the initial pressure, and the end pressure. Claim 2 A stack flow path volume measurement method according to claim 1, wherein any flow path is a cooling water flow path, and each inlet and outlet of the air flow path and hydrogen flow path is kept closed. Claim 3 In claim 2, the volume (V) of the cooling water flow path w ) is a stack Euro volume measurement method calculated by the following formula. Here, the above F w is a specific flow rate, and t w0 is the starting point of the above preset time, t w1 is the endpoint of the above preset time, P atm is atmospheric pressure, P w0 is the initial pressure, P w1 The termination pressure and V r is the volume of the standard tank. Claim 4 A stack flow path volume measurement method according to claim 1, wherein any flow path is an air flow path, the inlet and outlet of the cooling water flow path and the inlet of the hydrogen flow path are kept closed, and the outlet of the hydrogen flow path is opened when the specific flow rate is discharged. Claim 5 A stack flow path volume measurement method according to claim 4, configured to measure a crossover flow rate discharged from the outlet of the hydrogen flow path during the step of discharging the specific flow rate. Claim 6 A stack flow path volume measurement method according to claim 5, wherein the volume of the air flow path is calculated based on the specific flow rate, crossover flow rate, initial pressure, and end pressure. Claim 7 A stack flow path volume measurement method according to claim 6, wherein the volume (Vc) of the air flow path is calculated by the following formula. Here, the above F c is a specific flow rate, and t c0 is the starting point of the above preset time, t c1 is the endpoint of the above preset time, C c is the crossover flow rate discharged from the outlet of the above hydrogen flow path, P atm is atmospheric pressure, P c0 is the initial pressure, P c1 The termination pressure and V r is the volume of the standard tank. Claim 8 A stack flow path volume measurement method according to claim 1, wherein any flow path is a hydrogen flow path, the inlet and outlet of the cooling water flow path and the inlet of the air flow path are kept closed, and the outlet of the air flow path is opened when the specific flow rate is discharged. Claim 9 A stack flow path volume measuring method according to claim 8, wherein, during the step of discharging the specific flow rate, the crossover flow rate discharged from the outlet of the air flow path is configured to be measured. Claim 10 A stack flow path volume measurement method according to claim 9, wherein the volume of the hydrogen flow path is calculated based on the specific flow rate, crossover flow rate, initial pressure, and end pressure. Claim 11 A stack flow path volume measurement method according to claim 10, wherein the volume (Va) of the hydrogen flow path is calculated by the following formula. Here, the above F a is a specific flow rate, and t a0 is the starting point of the above preset time, t a1 is the endpoint of the above preset time, C a is the crossover flow rate discharged from the outlet of the above air passage, P atm is atmospheric pressure, P a0 is the initial pressure, P a1 The termination pressure and V r is the volume of the standard tank. Claim 12 A stack flow path volume measuring system comprising: a reference tank having a fixed volume configured to selectively communicate with a cooling water flow path, an air flow path, or a hydrogen flow path of a stack; a pressure gauge configured to measure a specific flow path communicating with the reference tank among the said flow paths and the pressure of said reference tank; and a flow meter provided on the outlet side of said specific flow path and configured to measure and control the flow rate discharged from said specific flow path. Claim 13 A stack flow path volume measuring system according to claim 12, wherein the flow meter is provided in each of the cooling water flow path, air flow path, and hydrogen flow path.

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