Battery box hydrogen monitoring device and method

Abstract

The invention discloses a hydrogen monitoring device and method for a battery box, and relates to the technical field of gas detection and battery detection. A top fixing ring fixedly mounted at the upper end of a first sleeve is arranged above a box cover, and a vertical through hole is formed in the top fixing ring. The gas detection cylinder comprises a second sleeve and a top cover disc located on the upper side of the second sleeve, the second sleeve downwards penetrates through the vertical through hole and is in threaded connection with the first inner screw hole, the gas detection cylinder is further provided with a heating gas cavity, a detection gas cavity and a vent hole communicating the heating gas cavity with the detection gas cavity, and the heating gas cavity penetrates through the top cover disc and extends to the second sleeve; the detection air cavity vertically penetrates through the top cover disc and the second sleeve. A hydrogen sensor is fixedly mounted above the gas detection cylinder, is provided with a temperature sensing probe and a heating rod which are inserted into the heating gas cavity, and is also provided with a hydrogen detection electrode which is inserted into the detection gas cavity. The hydrogen concentration in the battery box is dynamically and accurately monitored, and the detection accuracy and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection and battery detection, and in particular to a battery box hydrogen monitoring device and method. Background Art

[0002] As a key component of urban transportation, the operation safety of subway trains is of vital importance. In the energy system of subway trains, rechargeable batteries are often used for emergency power supplies or auxiliary systems. However, during the charging and discharging process of the battery, especially when the charging and discharging is abnormal, the problem of hydrogen produced by electrolyte decomposition cannot be ignored. Hydrogen is flammable and can form an explosive mixture when mixed with air in the range of 4%-74% by volume. In the closed and crowded environment of the subway, if hydrogen accumulation is not monitored and handled in time, it is very easy to cause fire or explosion, causing immeasurable casualties and property losses.

[0003] In the prior art, a hydrogen sensor is generally used to detect the hydrogen concentration in a battery box. When installing the hydrogen sensor in the battery box, a hole is opened in the battery box cover, and then a mounting bracket is welded. The sensor is then inserted into the mounting bracket and fixed by a top screw. During detection, the hydrogen sensor is restricted by the mounting structure. The hydrogen component detected by the hydrogen sensor is only a small amount of static gas that enters its mounting structure or the area around its sensor probe. Moreover, the gas flow in the battery box itself is not obvious. A single long-term detection of local gas components may result in differences in the detected data information and the actual hydrogen concentration information generated in the battery box.

[0004] In order to improve the fluidity of the gas in the battery box, additional equipment such as air pumps are needed. This not only leads to too many equipment, but also requires additional consideration of dynamic airflow sealing issues when air pumps and other equipment are guiding the airflow. If they are run for a long time, safety issues such as hydrogen leakage may occur.

[0005] In summary, how to enable the hydrogen sensor assembled on the battery box cover to dynamically detect the status of hydrogen composition in the battery box without using equipment such as air pumps that pose safety hazards has become a problem that needs to be solved. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a battery box hydrogen monitoring device and method, which realizes dynamic and accurate monitoring of the hydrogen concentration in the battery box without using equipment such as air pumps that have safety hazards, thereby improving detection accuracy and reliability.

[0007] The present invention is achieved through the following technical solutions:

[0008] A battery box hydrogen monitoring device, wherein a box cover of the battery box is pre-opened with a plurality of cover holes, a bottom fixing piece is inserted at the position of the cover holes of the box cover, the bottom fixing piece comprises a limiting chassis, a first sleeve located on the upper side of the limiting chassis, and a first inner screw hole vertically penetrating the limiting chassis and the first sleeve, the limiting chassis is located on the lower side of the box cover, and the first sleeve movably passes through the cover holes.

[0009] A top fixing ring is arranged on the top of the box cover and is fixedly mounted on the upper end of the first sleeve. A vertical through hole is provided on the top fixing ring. A gas detection tube is also installed in the vertical through hole and the first inner screw hole. The gas detection tube includes a second sleeve and a top cover plate located on the upper side of the second sleeve. The second sleeve passes through the vertical through hole and is screwed to the first inner screw hole. The gas detection tube is also provided with a heating air cavity, a detection air cavity, and a vent hole connecting the heating air cavity and the detection air cavity. The heating air cavity passes through the top cover plate and extends to the second sleeve. The detection air cavity vertically passes through the top cover plate and the second sleeve.

[0010] A hydrogen sensor is fixedly installed above the gas detection tube. The hydrogen sensor is equipped with a temperature sensing probe and a heating rod inserted into the heating gas cavity. The hydrogen sensor is also equipped with a hydrogen detection electrode inserted into the detection gas cavity.

[0011] As a preferred technical solution of the device of the present invention: a first sealing gasket sleeved on the periphery of the first sleeve is arranged on the upper side of the box cover, and the first sealing gasket is clamped between the bottom side of the top fixing ring and the top side of the box cover.

[0012] As a preferred technical solution of the device of the present invention: the side surface of the outer ring of the first sleeve is a first external thread surface, the top fixing ring is provided with a threaded slot with a threaded inner wall of the ring side, the vertical through hole penetrates downward to connect with the threaded slot, and the threaded slot of the top fixing ring is threadedly matched with the first external thread surface of the first sleeve. Wherein, assuming that the thickness of the box cover is H1, the vertical height of the threaded slot is H2, and the vertical height of the first sleeve is H3, then H2>H3-H1.

[0013] As a preferred technical solution of the device of the present invention: a second sealing gasket is sleeved on the outer periphery of the second sleeve, and the second sealing gasket is clamped between the bottom side of the top cover plate and the top side of the top fixing ring.

[0014] As a preferred technical solution of the device of the present invention: the outer annular surface of the second sleeve is a second external threaded surface, and the second external threaded surface of the second sleeve is threadedly matched with the first internal threaded hole of the first sleeve.

[0015] As a preferred technical solution of the device of the present invention: the spatial volume of the heating air cavity is greater than the spatial volume of the detection air cavity.

[0016] As a preferred technical solution of the device of the present invention: the horizontal position of the lowest point of the heating rod is lower than the horizontal position of the vent hole, and the heating rod is made of heat-conducting ceramic material.

[0017] A battery box hydrogen monitoring method, comprising the following contents:

[0018] S1. During battery operation, start the hydrogen sensor to detect the hydrogen concentration in the battery box.

[0019] S2. Any hydrogen sensor detects the hydrogen concentration parameter C in real time x , the system delay module starts. If the hydrogen concentration parameter detected by the current hydrogen sensor does not change within the delay t, the temperature sensor probe detects the current gas temperature, recorded as T0, and then the heating rod starts to heat the gas in the heating gas cavity.

[0020] S3. When the temperature sensor probe detects the gas temperature is T m The heating rod stops heating.

[0021] According to the ideal gas state equation, PV1 = n0RT0, P(V1 + V2) = n m RT m , where P is the pressure, n0 is the approximate value of the amount of gas substance under T0 conditions, and n m T m The approximate value of the amount of gas substance under the condition, R is the universal gas constant, V1 is the volume of the heating cavity, V2 is the volume of the detection cavity, then the temperature

[0022] During the heating process of the heating rod, the gas in the heating cavity is discharged into the detection cavity, and the gas in the detection cavity is discharged.

[0023] S4. After the heating rod stops heating, the temperature of the gas in the heating gas cavity and the detection gas cavity decreases, the gas pressure in the heating gas cavity and the detection gas cavity decreases, the gas in the battery box flows into the detection gas cavity, and the hydrogen detection electrode of the hydrogen sensor performs real-time detection of the gas newly entering the detection gas cavity.

[0024] S5. Repeat the contents of S2 to S4 and detect the hydrogen concentration in the battery box through the hydrogen sensor.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the present invention, the heating gas cavity, the detection gas cavity and the hydrogen sensor of the gas detection tube work together. When there may be an abnormal detection state, the hydrogen sensor can continuously obtain new gas samples for detection through a cycle of heating exhaust and cooling intake, thereby realizing dynamic and accurate monitoring of the hydrogen concentration in the battery box, improving the detection accuracy and reliability, ensuring timely grasp of the trend of hydrogen concentration changes, and effectively preventing safety hazards caused by hydrogen accumulation.

[0027] 2. The present invention utilizes its own structure to achieve natural flow and exchange of gas without using equipment such as air pumps, thereby simplifying the equipment system, reducing equipment costs and maintenance difficulties, and avoiding the safety risks brought by air pumps. Under the premise of ensuring the monitoring function, the overall safety and stability of the system are optimized, providing a more reliable, economical and safe solution for hydrogen monitoring in subway battery boxes, effectively ensuring the safety of subway operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of multiple hydrogen monitoring devices installed on the battery box cover in the present invention.

[0029] Figure 2 This is a structural diagram of the disassembled components of the hydrogen monitoring device in the present invention.

[0030] Figure 3 It is a structural diagram of the bottom fixing member, the top fixing ring and related components in the present invention.

[0031] Figure 4 This is a bottom side upward structural diagram of the top fixing ring in the present invention.

[0032] Figure 5 It is a structural diagram of the gas detection tube and hydrogen sensor in the present invention.

[0033] Figure 6 This is a bottom-side upward structural diagram of the hydrogen sensor in the present invention.

[0034] Figure 7 It is a cross-sectional view of multiple hydrogen monitoring devices installed on the battery box cover in the present invention.

[0035] Figure 8 for Figure 7 Schematic diagram of the structure with a partial enlargement at point A in the middle.

[0036] Among them: 1-box cover, 101-cover hole; 2-bottom fixing piece, 201-first sleeve, 2011-first external threaded surface, 202-limiting chassis, 203-first internal screw hole; 3-top fixing ring, 301-threaded slot hole, 302-vertical through hole; 4-first sealing gasket; 5-gas detection tube, 501-second sleeve, 5011-second external threaded surface, 502-top cover plate, 503-heating air cavity, 504-detection air cavity, 505-vent; 6-second sealing gasket; 7-hydrogen sensor, 701-temperature sensor probe, 702-heating rod, 703-hydrogen detection electrode. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] Embodiment 1: The present invention designs a battery box hydrogen monitoring device, such as Figure 1 , Figure 2 , Figure 7 , mainly including bottom fixing part 2, top fixing ring 3, gas detection tube 5, hydrogen sensor 7 and other components. The specific structure is as follows:

[0039] (a) Bottom fixing member 2: Figure 2 , Figure 3 , Figure 7 , Figure 8 , which is composed of a limiting chassis 202, a first sleeve 201 and a first inner screw hole 203. The limiting chassis 202 is located at the lower side of the box cover 1, and plays a supporting and positioning role to prevent the bottom fixing part from shaking under the box cover. The first sleeve 201 movably passes through the cover hole 101 of the box cover 1, and the first outer threaded surface 2011 on the side of the outer ring is used to connect with the top fixing ring 3, and the first inner screw hole 203 is used to install the gas detection tube 5, which is a key component for connecting the box cover 1 and the gas detection tube 5.

[0040] (ii) Top fixing ring 3: Figure 2 , Figure 3 , Figure 4 , Figure 8 The threaded slot 301 is threadedly engaged with the first external threaded surface 2011 of the first sleeve 201 to ensure that the bottom fixing member 2 is tightly connected with the top fixing ring 3, so that the entire device is firmly fixed on the box cover 1. The vertical through hole 302 provides a channel for the installation of the gas detection tube 5, and its structural design ensures the stability and sealing of the gas detection tube 5 after installation.

[0041] (III) Gas detection tube 5: Figure 2 , Figure 3 , Figure 5 , Figure 8, including a second sleeve 501, a top cover plate 502, a heating air cavity 503, a detection air cavity 504 and a vent 505. The second sleeve 501 passes through the vertical through hole 302 and is screwed with the first inner screw hole 203. The second outer threaded surface 5011 of its outer annular surface enhances the connection stability with the bottom fixing member 2. The heating air cavity 503 passes through the top cover plate 502 and extends to the second sleeve 501. Its larger space volume provides sufficient space for gas heating, and plays a key role in driving gas flow during the monitoring process. The detection air cavity 504 vertically passes through the top cover plate 502 and the second sleeve 501, and is the main place for hydrogen concentration detection. The vent 505 connects the heating air cavity 503 and the detection air cavity 504, so that the gas can flow smoothly between the two chambers, ensuring the realization of the gas circulation detection process.

[0042] ㈣ Hydrogen sensor 7: Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 , fixedly installed above the gas detection tube 5, its temperature sensing probe 701 is inserted into the heating gas cavity 503, which can detect the temperature of the gas in the heating gas cavity in real time, providing a basis for heating control. The heating rod 702 is also located in the heating gas cavity 503, and is made of a heat-conducting ceramic material rod. The horizontal position of its lowest point is lower than the horizontal position of the vent 505, ensuring that the gas can be effectively discharged from the heating gas cavity 503 into the detection gas cavity 504 during the heating process. The hydrogen detection electrode 703 is inserted into the detection gas cavity 504 to detect the hydrogen concentration in the gas, realizing the monitoring function of the hydrogen in the battery box.

[0043] ㈤Sealing gasket: such as Figure 2 , Figure 3 , Figure 8 The first sealing gasket 4 is sleeved on the periphery of the first sleeve 201, and is clamped between the bottom side of the top fixing ring 3 and the top side of the box cover 1, effectively preventing gas leakage from between the top fixing ring 3 and the box cover 1. The second sealing gasket 6 is sleeved on the periphery of the second sleeve 501, and is located between the bottom side of the top cover plate 502 and the top side of the top fixing ring 3, preventing gas leakage from between the gas detection tube 5 and the top fixing ring 3, ensuring the sealing of the device and improving the accuracy of hydrogen detection.

[0044] Embodiment 2: The present invention designs a battery box hydrogen monitoring method, the specific contents are as follows:

[0045] First, during the operation of the battery, the hydrogen sensor 7 is started to detect the hydrogen concentration in the battery box.

[0046] Second, any hydrogen sensor 7 detects a hydrogen concentration parameter C in real time. x, the system delay module starts. If the hydrogen concentration parameter detected by the current hydrogen sensor 7 does not change within the delay t, the temperature sensor probe 701 detects the current gas temperature, recorded as T0, and then the heating rod 702 starts to heat the gas in the heating gas cavity 503.

[0047] Third, when the temperature sensor probe 701 detects the gas temperature to be T m When , the heating rod 702 stops heating.

[0048] According to the ideal gas state equation, PV1 = n0RT0, P(V1 + V2) = n m RT m , where P is the pressure, n0 is the approximate value of the amount of gas substance under T0 conditions, and n m T m The approximate value of the amount of gas substance under the condition, R is the universal gas constant, V1 is the volume of the heating cavity, V2 is the volume of the detection cavity, then the temperature

[0049] In the above content, according to the ideal gas state equation PV = nRT, when the pressure P, the universal gas constant R, the volume of the heated gas cavity V1, and the temperatures T0 and T m In the case of , n0 and n can be obtained by the following method m :

[0050] For n0, at temperature T0, the ideal gas state equation can be transformed to obtain Here, P is the pressure of the gas in the battery box (in actual applications, it may need to be measured by a pressure sensor or other equipment, or in some approximate cases, it may be estimated based on the standard atmospheric pressure of the environment in which the battery box is located), V1 is the volume of the heating air cavity 503 (determined during device design and can be calculated through the geometric dimensions of the device), R is a known universal gas constant, and T0 is the initial gas temperature detected by the temperature sensor probe 701.

[0051] Using the above method, we can also get T m Under the condition n m Through multiple experiments, we can obtain the discrete data of n with the change of temperature T. After fitting linear analysis, we can estimate the value of any temperature T. x Under the condition n x Approximate estimate of .

[0052] During the heating process of the heating rod 702 , the gas in the heating gas cavity 503 is discharged into the detection gas cavity 504 , and the gas in the detection gas cavity 504 is discharged to the outside.

[0053] Fourth, after the heating rod 702 stops heating, the temperature of the gas in the heating gas cavity 503 and the detection gas cavity 504 decreases, the gas pressure in the heating gas cavity 503 and the detection gas cavity 504 decreases, the gas in the battery box flows into the detection gas cavity 504, and the hydrogen detection electrode 703 of the hydrogen sensor 7 performs real-time detection of the gas newly entering the detection gas cavity 504. The hydrogen sensor 7 is generally designed with a temperature compensation mechanism, and the parameters are compensated and optimized according to the different temperatures of the detected gas. This belongs to the temperature compensation technology in the sensor, which is relatively common in the prior art and will not be repeated in the present invention.

[0054] Finally, repeat the steps from the second step to the fourth step, and detect the hydrogen concentration in the battery box through the hydrogen sensor 7.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery box hydrogen monitoring device, wherein a battery box cover (1) is pre-opened with a plurality of cover holes (101), characterized in that: A bottom fixing member (2) is inserted at the cover hole (101) of the box cover (1), and the bottom fixing member (2) comprises a limiting chassis (202), a first sleeve (201) located on the upper side of the limiting chassis (202), and a first internal screw hole (203) vertically penetrating the limiting chassis (202) and the first sleeve (201); the limiting chassis (202) is located on the lower side of the box cover (1), and the first sleeve (201) movably passes through the cover hole (101); A top fixing ring (3) is arranged above the box cover (1) and is fixedly mounted on the upper end of the first sleeve (201), and a vertical through hole (302) is formed in the top fixing ring (3); The vertical through hole (302) and the first inner screw hole (203) are also provided with a gas detection tube (5), the gas detection tube (5) comprising a second sleeve (501) and a top cover plate (502) located on the upper side of the second sleeve (501), the second sleeve (501) passes through the vertical through hole (302) and is screwed to the first inner screw hole (203), the gas detection tube (5) is also provided with a heating air cavity (503), a detection air cavity (504), and a vent hole (505) connecting the heating air cavity (503) and the detection air cavity (504), the heating air cavity (503) passes through the top cover plate (502) and extends to the second sleeve (501), the detection air cavity (504) vertically passes through the top cover plate (502) and the second sleeve (501); A hydrogen sensor (7) is fixedly mounted above the gas detection tube (5); the hydrogen sensor (7) is provided with a temperature sensing probe (701) and a heating rod (702) inserted into a heating gas cavity (503); the hydrogen sensor (7) is also provided with a hydrogen detection electrode (703) inserted into a detection gas cavity (504).

2. A battery box hydrogen monitoring device according to claim 1, characterized in that: The upper side of the box cover (1) is provided with a first sealing gasket (4) sleeved on the outer periphery of the first sleeve (201), and the first sealing gasket (4) is clamped between the bottom side of the top fixing ring (3) and the top side of the box cover (1).

3. A battery box hydrogen monitoring device according to claim 1, characterized in that: The outer ring side surface of the first sleeve (201) is a first external threaded surface (2011), the top fixing ring (3) is provided with a threaded slot hole (301) with threads on the inner wall of the ring side, the vertical through hole (302) penetrates downward to connect with the threaded slot hole (301), and the threaded slot hole (301) of the top fixing ring (3) is threadedly matched with the first external threaded surface (2011) of the first sleeve (201); Wherein, assuming that the thickness of the box cover (1) is H1, the vertical height of the threaded slot hole (301) is H2, and the vertical height of the first sleeve (201) is H3, then H2>H3-H1.

4. A battery box hydrogen monitoring device according to claim 1, characterized in that: The second sleeve (501) is sleeved with a second sealing gasket (6) on its outer periphery, and the second sealing gasket (6) is clamped between the bottom side of the top cover plate (502) and the top side of the top fixing ring (3).

5. A battery box hydrogen monitoring device according to claim 1, characterized in that: The outer annular surface of the second sleeve (501) is a second external threaded surface (5011), and the second external threaded surface (5011) of the second sleeve (501) is threadedly engaged with the first internal threaded hole (203) of the first sleeve (201).

6. A battery box hydrogen monitoring device according to claim 1, characterized in that: The spatial volume of the heating air cavity (503) is greater than the spatial volume of the detection air cavity (504).

7. A battery box hydrogen monitoring device according to claim 1, characterized in that: The horizontal position of the lowest point of the heating rod (702) is lower than the horizontal position of the vent hole (505), and the heating rod (702) is made of a heat-conducting ceramic material.

8. A method for monitoring hydrogen in a battery box, characterized in that: A battery box hydrogen monitoring device according to any one of claims 1 to 7, comprising the following contents: S1. During battery operation, the hydrogen sensor (7) is started to detect the hydrogen concentration in the battery box; S2. Any hydrogen sensor (7) detects the hydrogen concentration parameter C in real time x , the system delay module is started. If the hydrogen concentration parameter detected by the current hydrogen sensor (7) does not change within the delay t, the temperature sensor probe (701) detects the current gas temperature, which is recorded as T0, and then the heating rod (702) is started to start heating the gas in the heating gas cavity (503); S3. When the temperature sensing probe (701) detects that the gas temperature is T m When , the heating rod (702) stops heating; According to the ideal gas state equation, PV1 = n0RT0, P(V1 + V2) = n m RT m , where P is the pressure, n0 is the approximate value of the amount of gas substance under T0 conditions, and n m T m The approximate value of the amount of gas substance under the condition, R is the universal gas constant, V1 is the volume of the heating cavity, V2 is the volume of the detection cavity, then the temperature During the heating process of the heating rod (702), the gas in the heating gas cavity (503) is discharged into the detection gas cavity (504), and the gas in the detection gas cavity (504) is discharged outward; S4. After the heating rod (702) stops heating, the temperature of the gas in the heating gas cavity (503) and the detection gas cavity (504) decreases, the gas pressure in the heating gas cavity (503) and the detection gas cavity (504) decreases, the gas in the battery box () flows into the detection gas cavity (504), and the hydrogen detection electrode (703) of the hydrogen sensor (7) performs real-time detection of the gas newly entering the detection gas cavity (504); S5. Repeat the contents of steps S2 to S4, and detect the hydrogen concentration in the battery box through the hydrogen sensor (7).

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