An integrated power supply for rail transit

Abstract

The present invention discloses an integrated power supply for rail transit, which includes a power detection device and a safety detection system. The power detection device includes a battery box, inside which a tray is slidably connected. One side of the tray is welded with a side plate, and a handle is welded to the outer end of the side plate. Two lithium batteries are placed inside the tray. A partition is arranged between the two lithium batteries and is welded to the bottom of the tray. The two lithium batteries are connected in series and are provided with a charging head, which is fixed to one side of the tray. A cross bar is fixed to one side of the tray, and the cross bar is of a telescopic structure. An installation seat is fixed to the upper end of the cross bar, and a charging seat is fixed in the middle of the installation seat. The charging seat cooperates with the charging head and is used for the charging work of the lithium battery. In the present invention, the functions of real-time measurement of the battery state according to the usage situation of the power supply and intelligent evaluation are conveniently and efficiently realized.

Description

Technical Field

[0001] The present invention is applied to the background of the backup power supply for rail transit, and its name is an integrated power supply for rail transit. Background Art

[0002] With the rapid development of the rail transit industry, the supporting power supply technology is also developing rapidly. At present, the underfloor supporting power supply on the train is used for the temporary power supply of each carriage. In order to meet the requirement of long endurance, the power supply begins to transform from traditional batteries to lithium batteries to adapt to the needs of industry development.

[0003] However, battery safety has become one of the key factors in the rapid development of lithium batteries. Therefore, the research on battery safety is increasing day by day, and the research on the mechanism of battery thermal runaway has always been a hot topic. Under abusive conditions, side reactions will occur inside the battery and a large amount of gas will be generated, resulting in the expansion and deformation of the battery case. Further, it may lead to battery combustion and explosion. At present, there is no power supply that can measure and evaluate the surface expansion degree of lithium batteries in real time, and then determine the critical state of battery explosion, so as to reduce the risk of battery explosion and improve battery safety. At the same time, the operating environment of the power supply for trains is poor and it is in a vibrating state for a long time, which will also have a negative effect on the expanded battery and reduce the service life of the battery.

[0004] Therefore, it is necessary to provide an integrated power supply for rail transit, which can achieve the function of measuring and evaluating the battery state in real time according to the usage of the power supply. Summary of the Invention

[0005] The purpose of the present invention is to provide an integrated power supply for rail transit to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: An integrated power supply for rail transit, comprising a power supply detection device and a safety detection system. The power supply detection device includes a battery box, inside which a tray is slidably connected. One side of the tray is welded with a side plate, and the outer end of the side plate is welded with a handle. Two groups of lithium batteries are placed inside the tray, and a weight sensor is arranged between the tray and the lithium batteries. A partition is arranged between the two groups of lithium batteries, and the partition is welded to the bottom of the tray. The two groups of lithium batteries are connected in series and are provided with a charging head, which is fixed to one side of the tray. A cross bar is fixed to one side of the tray, and the cross bar is of a telescopic structure. An installation seat is fixed to the upper end of the cross bar, and a charging seat is fixed in the middle of the installation seat. The charging seat cooperates with the charging head and is used for the charging work of the lithium batteries.

[0007] In one embodiment, a fan and a thermometer are fixedly installed inside the inner side of the side plate, a camera is fixedly installed on the inner side of the side plate, the camera is directly facing the gap between the tray and the lithium battery, a vertical rod is fixedly installed at the bottom of the tray, the vertical rod is a telescopic structure, the vertical rod is located on one side of the lithium battery, a detection seat is fixedly installed above the vertical rod, multiple detection rods are fixedly installed on one side of the detection seat, the multiple detection rods are telescopic structures, and pressure sensors are arranged at the ends of the multiple detection rods and are close to the surface of the lithium battery.

[0008] In one embodiment, the safety detection system includes an intelligent control module, an intelligent detection module, and an intelligent operation module, and the intelligent control module, the intelligent detection module, and the intelligent operation module are respectively connected by radio.

[0009] The intelligent control module includes a data recording module, a data operation module, a logic judgment module, and a time control module, the intelligent detection module includes a vibration detection module, a bulging detection module, and a temperature detection module, and the intelligent operation module includes a charging control module, an exhaust heat dissipation module, and a detection control module.

[0010] The vibration detection module is electrically connected to the camera, the bulging detection module is electrically connected to the pressure sensor, the temperature detection module is electrically connected to the thermometer, the charging control module is electrically connected to the cross bar, the exhaust heat dissipation module is electrically connected to the fan, and the detection control module is electrically connected to the vertical rod and the detection rod.

[0011] In one embodiment, the operation of the safety detection system includes the following steps:

[0012] S1. Start the safety detection system during the whole process of charging the lithium battery. At this time, control the charging head and the charging seat (11) to be combined for charging.

[0013] S2. Use the vibration detection module to collect the vibration information of the lithium battery in real time, and use the bulging detection module to collect the bulging state information of the lithium battery during charging at regular intervals. Use the weight detection module to collect the mass information of the lithium battery, and store it together with the initial data of the safety detection system in the data recording module.

[0014] S3. Use the data operation module to calculate the detection results, and use the logic judgment module to determine the critical state of the bulging height and the area ratio of the lithium battery.

[0015] S4. Use the temperature detection module to collect the temperature information of the lithium battery during charging, and combine it with the area ratio of the bulge to determine the safety level of the lithium battery.

[0016] S5. According to the determined safety level, take corresponding measures to prevent safety accidents from occurring.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: By providing a power detection device and a safety detection system, the present invention can detect the bulging and charging temperature on the surface of the lithium battery in real time during the charging process, and can intelligently select a charging strategy according to the shaking situation of the vehicle during driving, ensuring the smooth and safe charging of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solutions and other beneficial effects of the present application will become obvious by describing the specific embodiments of the present application in detail with reference to the accompanying drawings.

[0019] In the drawings:

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is an exploded schematic diagram of the overall structure of the present invention;

[0022] Figure 3 is a schematic diagram of the overall structure of the battery box of the present invention;

[0023] Figure 4 is a schematic diagram of the structure at the tray of the present invention;

[0024] Figure 5 is a partial schematic diagram of part A of the present invention;

[0025] Figure 6 is a partial schematic diagram of part B of the present invention;

[0026] Figure 7 is a schematic diagram of the interrelationship of the various modules of the present invention;

[0027] In the figure: 1. Battery box; 2. Camera; 3. Side plate; 4. Handle; 5. Tray; 6. Lithium battery; 7. Partition; 8. Mounting seat; 9. Cross bar; 10. Charging head; 11. Charging seat; 12. Vertical rod; 13. Detection seat; 14. Detection rod; 15. Fan; 17. Box cover; 18. Water cooling component; 19. Heat dissipation hole; 20. Ventilation cap; 21. Induction spring; 22. Cover body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can realize the application of other processes and / or the use of other materials.

[0029] Please refer to Figures 1-5 , the present invention provides a technical solution: an integrated power supply for rail transit, including a power detection device and a safety detection system. The power detection device includes a battery box 1. A tray 5 is slidably connected inside the battery box 1. A side plate 3 is welded to one side of the tray 5. A handle 4 is welded to the outer end of the side plate 3. Two groups of lithium batteries 6 are placed inside the tray 5. A weight sensor is provided between the tray 5 and the lithium batteries 6. A partition 7 is provided between the two groups of lithium batteries 6. The partition 7 is welded to the bottom of the tray 5. The two groups of lithium batteries 6 are connected in series and provided with a charging head 10. The charging head 10 is fixed to one side of the tray 5. A cross bar 9 is fixed to one side of the tray 5. The cross bar 9 is a telescopic structure. A mounting seat 8 is fixed to the upper end of the cross bar 9. A charging seat 11 is fixed in the middle of the mounting seat 8. The charging seat 11 cooperates with the charging head 10 and is used for the charging work of the lithium batteries 6;

[0030] The battery box 1 is installed at the bottom of the vehicle and is used for the temporary power supply of the carriage. Generally, two groups are provided for each carriage for alternating power supply. Therefore, charging may occur during driving;

[0031] When the lithium batteries 6 are discharged, they need to be charged. At this time, the cross bar 9 starts to contract, driving the mounting seat 8 to move inward, thereby driving the charging seat 11 to combine with the charging head 10 to start charging. After charging is completed, the cross bar 9 moves outward to separate the charging seat 11 from the charging head 10. The partition 7 is used to separate the two groups of lithium batteries 6 to improve safety;

[0032] A fan 15 and a thermometer are fixed inside the inner side of the side plate 3. A camera 2 is fixed to the inner side of the side plate 3. The camera 2 is directly opposite to the gap between the tray 5 and the lithium batteries 6. A vertical rod 12 is fixed to the bottom of the tray 5. The vertical rod 12 is a telescopic structure. The vertical rod 12 is located on one side of the lithium batteries 6. A detection seat 13 is fixed above the vertical rod 12. A plurality of detection rods 14 are fixed to one side of the detection seat 13. The plurality of detection rods 14 are telescopic structures. Pressure sensors are provided at the ends of the plurality of detection rods 14 and are close to the surface of the lithium batteries 6;

[0033] After long-term use, the lithium battery 6 will gradually age, with the charging time becoming longer, the temperature rising, and bulges appearing on the surface. Therefore, it is necessary to detect in real time to determine the state of the lithium battery 6. A thermometer is used to collect the temperature state during charging in real time. At the same time, the vertical rod 12 moves up and down every once in a while, and a pressure sensor is used to collect the bulging condition of the surface of the lithium battery 6. Since charging also occurs when the vehicle is moving, and when the vehicle is moving, it will cause the lithium battery 6 to shake. If there is a bulge on the surface, it may keep colliding with the side wall of the tray 5, thus generating danger. Therefore, a camera 2 is used to collect the real-time distance between the lithium battery 6 and the side wall of the tray 5 to ensure safety during charging. At the same time, the camera 2 can also be used to observe the indicator light of the charging state of the lithium battery 6 to determine whether the charging is completed;

[0034] The safety detection system includes an intelligent control module, an intelligent detection module, and an intelligent operation module. The intelligent control module, the intelligent detection module, and the intelligent operation module are respectively connected by radio;

[0035] The intelligent control module includes a data recording module, a data calculation module, a logic judgment module, and a time control module. The intelligent detection module includes a vibration detection module, a bulge detection module, and a temperature detection module. The intelligent operation module includes a charging control module, an exhaust heat dissipation module, and a detection control module;

[0036] The vibration detection module is electrically connected to the camera 2, the bulge detection module is electrically connected to the pressure sensor, the weight detection device is electrically connected to the weight sensor, the temperature detection module is electrically connected to the thermometer, the charging control module is electrically connected to the cross bar 9, the exhaust heat dissipation module is electrically connected to the fan 15, and the detection control module is electrically connected to the vertical rod 12 and the detection rod 14;

[0037] The data recording module is used to record various data collected in real time, including the preset values of the safety detection system. The data calculation module is used to calculate the recorded data. The logic judgment module is used to analyze and judge the calculation results to determine the charging strategy of the lithium battery. The time control module is used for time control during the detection process. The vibration detection module is used to collect the vibration information of the lithium battery when the vehicle is running. The bulge detection module is used to collect the bulge state information of the lithium battery during charging. The weight detection module is used to collect the mass information of the lithium battery in real time. The temperature detection module is used to collect the temperature information of the lithium battery during charging. The charging control module is used to control the connection and disconnection of the charging head 10 and the charging seat 11. The exhaust heat dissipation module is used to adjust the heat dissipation strategy according to the charging temperature state. The detection control module is used to control the lifting of the vertical rod 12 and the telescoping of the detection rod 14;

[0038] The operation of the safety detection system includes the following steps:

[0039] S1. During the whole process of charging the lithium battery 6, the safety detection system is started. At this time, the charging head 10 and the charging seat 11 are controlled to be combined for charging;

[0040] S2. Use the vibration detection module to collect the vibration information of the lithium battery 6 in real time, and use the bulging detection module to collect the bulging state information of the lithium battery 6 during charging at regular intervals. Use the weight detection module to collect the mass information of the lithium battery 6, and store it together with the initial data of the safety detection system in the data recording module;

[0041] S3. Use the data operation module to calculate the detection results, and use the logic judgment module to determine the critical state of the bulging height and the area ratio of the lithium battery 6;

[0042] S4. Use the temperature detection module to collect the temperature information of the lithium battery 6 during charging, and combine it with the area ratio of the bulge to determine the safety level of the lithium battery 6;

[0043] S5. According to the determined safety level, take corresponding measures to prevent safety accidents;

[0044] The method of data collection in S2 is as follows:

[0045] S21. There is a certain gap between the side wall of the lithium battery 6 and the tray 5. During vehicle driving, the bottom of the lithium battery 6 is fixed, and the upper end will swing with the vibration. When the swing amplitude is large, the distance from the side wall of the tray 5 will be shortened. Use the camera 2 to collect the minimum distance between the side walls of the lithium battery 6 and the tray 5 in real time;

[0046] During the i-th charging process, the minimum distance between the side wall of the lithium battery 6 and the tray 5 is set as

[0047] S21. During the charging process of the lithium battery 6, bulges will appear on its surface. Use the bulging detection module to collect the data of the end face of the lithium battery 6. Since the overall material of the lithium battery 6 is uniform, the data of the end face can indirectly reflect the bulging situation on the side. At the initial stage of detection, the detection seat 13 is at the bottom. At this time, multiple detection rods 14 extend together until the pressure sensors at the ends of all detection rods 14 collect pressure values, then stop extending. At this time, use the vertical rod 12 to drive the detection rods 14 to move up and down for one cycle through the detection seat 13, and record the pressure values collected by all pressure sensors, so as to indirectly determine the size of the bulge on the surface of the lithium battery 6;

[0048] Set the initial period of bulge detection as T0, and at the same time set the maximum force received by the pressure sensor during the i-th charging process as The maximum bearing capacity of the pressure sensor is F, and when it is under the maximum force, the retraction distance is L;

[0049] By setting the data collection parameters, it is convenient for subsequent quantitative calculation and analysis;

[0050] The method for determining the height critical state in S3 is as follows:

[0051] With the long-term use of the lithium battery 6, not only will bulges appear on the surface, but its mass will also continuously decrease. Due to the decrease in its mass, when the locomotive makes an emergency stop or starts, the stable state of the lithium battery 6 is more likely to be changed, and the amplitude of its shaking will increase;

[0052] When , there is a risk of continuous collision of the bulges on the lithium battery 6, which is a dangerous state;

[0053] When , it is a safe state;

[0054] Where M0 is the original mass of the lithium battery 6, and M i is the mass of the lithium battery 6 during the i-th charging process;

[0055] The method for determining the area critical state in S3 is as follows:

[0056] When the lithium battery 6 is in a safe state, although there is no risk of collision, if there are too many bulges, it will also cause a decline in the performance of the lithium battery 6, resulting in too long charging time and generating high temperature, which will also cause danger. At this time, the bulge detection module is used to collect the area distribution of the bulges on the lithium battery 6;

[0057] Because the lifting speed of the vertical rod 12 is constant, when the pressure sensor touches the bulge, the pressure value will experience a process from small to large and then from large to small. The time of this process is collected. At the same time, combined with the number and area of the pressure sensors, the area of the bulge can be estimated, and then compared with the total side area to determine the area ratio of the bulge of the lithium battery 6;

[0058] Set the ratio of the bulge area to the total side area during the i-th charging process as γ i , and its value is determined by the following formula:

[0059]

[0060] Where A is the width of the side of the lithium battery 6, B is the height of the lithium battery 6, T0 is the total time of each detection, and T j is the total time when the pressure sensor goes from small to large and then from large to small when passing through the j-th bulge, m is the total number of detected bulges, S is the total area of the contact surface of the pressure sensor, and this surface is square;

[0061] The method for determining the safety level of the lithium battery 6 in S4 is as follows:

[0062] The safe temperature of the lithium battery 6 during charging is 50 °C. If the temperature exceeds this value during charging, there will be certain safety risks. Determine the safety factor of the lithium battery 6 based on the bulging state and temperature of the lithium battery 6 during the charging process;

[0063] S41. When γ i ≤ 5%, it indicates that there is little bulging, the state of the lithium battery 6 is good, and the safety level is Class I;

[0064] S42. When 5% < γ i ≤ 20%, it indicates that the bulging is normal, and it is necessary to judge in combination with the charging temperature:

[0065] A. When t i ≤ 50 °C, it indicates that the charging state of the lithium battery 6 is normal, and the safety level is Class II;

[0066] B. When t i > 50 °C, it indicates that the charging state of the lithium battery 6 is abnormal, and the safety level is Class III;

[0067] where t i is the temperature data collected by the thermometer in real time;

[0068] S43. When γ i > 20%, it indicates that the bulging is serious, the state of the lithium battery 6 is poor, and the safety level is Class IV;

[0069] The processing strategies in S5 are as follows:

[0070] S51. When the safety level is Class I and Class II, charge normally without any treatment;

[0071] S52. When the safety level is Class III, it is necessary to increase the power of the fan 15 to enhance heat dissipation and shorten the detection period. Among them, the heat dissipation power of the fan 15 is doubled, and the detection period is shortened by half;

[0072] S53. When the safety level is Class IV, directly disconnect the charging plug and give an alarm;

[0073] The timing of interrupting charging in S52 is as follows:

[0074] When t i > 60 °C, charging is interrupted;

[0075] A box cover 17 is fastened to the side of the battery box 1. A heat dissipation hole 19 is provided at the upper end of the box cover 17. A ventilation cap 20 is fastened to the upper end of the heat dissipation hole 19. An induction spring 21 is fastened to the upper end of the ventilation cap 20. A cover body 22 is fastened to the upper end of the induction spring 21. A water cooling component is provided inside the box cover 17;

[0076] The heat dissipated by the fan 15 passes through the heat dissipation hole 19 and is discharged through the ventilation cap 20;

[0077] When encountering rainy weather, rainwater falls on the cover body 22 and exerts a certain pressure on the sensing spring 21, causing the sensing spring to compress. As a result, the cover body 22 moves downward, reducing the distance between the cover body 22 and the ventilation cap 20, preventing rainwater from entering the box cover and damaging the electrical components inside. Moreover, the greater the rain, the greater the downward movement amplitude of the cover body 22, so that rainwater can be prevented from entering the box cover according to the amount of rainfall.

[0078] At the same time, during rainy weather, since the distance between the cover body 22 and the ventilation cap 20 becomes smaller, the heat dissipation effect will be affected:

[0079] When the safety level is Grade I and Grade II, during normal charging, since the heat generation is not large, it can be left untreated.

[0080] When the safety level is Grade III, due to the increased heat generation, normal air cooling can no longer achieve the cooling effect. At this time, the safety detection system controls the water cooling component to start, and water cooling is used to assist in heat dissipation inside the battery box 1.

[0081] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, a connection through the interior of two components, or an interaction relationship between two components. For those of ordinary skill in the art, the above terms in the present application can be understood according to specific circumstances.

[0082] The above has introduced in detail a cleaning device provided by an embodiment of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrated power supply for rail transit, comprising a power detection device and a safety detection system, characterized in that: The power supply detection device includes a battery box (1). A tray (5) is slidably connected inside the battery box (1). A side plate (3) is welded to one side of the tray (5). A handle (4) is welded to the outer end of the side plate (3). Two groups of lithium batteries (6) are placed inside the tray (5). A weight sensor is arranged between the tray (5) and the lithium batteries (6). A partition (7) is arranged between the two groups of lithium batteries (6). The partition (7) is welded to the bottom of the tray (5). The two groups of lithium batteries (6) are connected in series and are provided with a charging head (10). The charging head (10) is fixed to one side of the tray (5). A cross bar (9) is fixed to one side of the tray (5). The cross bar (9) is of a telescopic structure. A mounting seat (8) is fixed to the upper end of the cross bar (9). A charging seat (11) is fixed in the middle of the mounting seat (8). The charging seat (11) cooperates with the charging head (10) and is used for the charging work of the lithium batteries (6). A fan (15) and a thermometer are fixed inside the inner side of the side plate (3). A camera (2) is fixed to the inner side of the side plate (3). The camera (2) is directed at the gap between the tray (5) and the lithium batteries (6). A vertical rod (12) is fixed to the bottom of the tray (5). The vertical rod (12) is of a telescopic structure. The vertical rod (12) is located on one side of the lithium batteries (6). A detection seat (13) is fixed above the vertical rod (12). A plurality of detection rods (14) are fixed to one side of the detection seat (13). The plurality of detection rods (14) are all of a telescopic structure. Pressure sensors are arranged at the ends of the plurality of detection rods (14) and are close to the surface of the lithium batteries (6). The safety detection system includes an intelligent control module, an intelligent detection module and an intelligent operation module. The intelligent control module, the intelligent detection module and the intelligent operation module are respectively connected by radio. The intelligent control module includes a data recording module, a data operation module, a logic judgment module and a time control module. The intelligent detection module includes a vibration detection module, a bulging detection module and a temperature detection module. The intelligent operation module includes a charging control module, an exhaust heat dissipation module and a detection control module. The vibration detection module is electrically connected to the camera (2). The bulging detection module is electrically connected to the pressure sensor. The weight detection device is electrically connected to the weight sensor. The temperature detection module is electrically connected to the thermometer. The charging control module is electrically connected to the cross bar (9). The exhaust heat dissipation module is electrically connected to the fan (15). The detection control module is electrically connected to the vertical rod (12) and the detection rods (14).

2. The integrated power supply for rail transit according to claim 1, wherein: The operation of the safety detection system includes the following steps: S1. Start the safety detection system during the whole process of charging the lithium batteries (6). At this time, control the charging head (10) and the charging seat (11) to be combined for charging. S2. Use the vibration detection module to collect the vibration information of the lithium battery (6) in real time, and use the bulging detection module to collect the bulging state information of the lithium battery (6) during charging at regular intervals. Use the weight detection module to collect the mass information of the lithium battery (6), and store it together with the initial data of the safety detection system in the data recording module; S3. Use the data operation module to calculate the detection results, and use the logical judgment module to determine the critical state of the bulging height and the area ratio of the lithium battery (6); S4. Use the temperature detection module to collect the temperature information of the lithium battery (6) during charging, and determine the safety level of the lithium battery (6) in combination with the area ratio of the bulge; S5. According to the determined safety level, take corresponding measures to prevent safety accidents from occurring.

3. An integrated power supply for rail transit according to claim 2, characterized in that: The method of data collection in S2 is as follows: S21. Set the minimum distance between the bulge on the lithium battery (6) and the side wall of the tray (5) during the i-th charging process as S22. Set the initial period of bulge detection as T0. At the same time, during the i-th charging process, set the maximum force collected by the pressure sensor as The maximum bearing force of the pressure sensor is F. When the maximum force is applied, the retraction distance is L; By setting the data collection parameters, it is convenient for subsequent quantitative calculation and analysis.

4. The integrated power supply for rail transit according to claim 3, characterized in that: The method for determining the critical state of height in S3 is as follows: When occurs, there is a risk that the bulge on the lithium battery (6) will be continuously collided, which is a dangerous state; When it is in a safe state; Where M0 is the original mass of the lithium battery (6), and M i is the mass of the lithium battery (6) during the i-th charging process.

5. An integrated power supply for rail transit according to claim 4, characterized in that: The method for determining the critical state of area in S3 is as follows: During the i-th charging process, the ratio of the bulging area to the total side area is set as γ i , and its value is determined by the following formula: Where A is the width of the side of the lithium battery (6), B is the height of the lithium battery (6), T0 is the total time of each detection, and T j is the total time when the pressure sensor passes through the j-th bulge, from small to large and then from large to small. m is the total number of detected bulges, and S is the total contact area of the pressure sensor, and this surface is square.

6. The integrated power supply for rail transit according to claim 5, wherein: The method for determining the safety level of the lithium battery (6) in S4 is as follows: S41. When γ i ≤ 5%, it indicates that there are few bulges, the lithium battery (6) is in good condition, and the safety level is Class I; S42. When 5% < γ i ≤ 20%, it indicates that the bulge is normal, and it is necessary to make a judgment in combination with the charging temperature: A. When t i ≤ 50 °C, it indicates that the lithium battery (6) is in a normal charging state and the safety level is Class II; B. When t i > 50 °C, it indicates that the charging state of the lithium battery (6) is abnormal, and the safety level is III; where t i is the temperature data collected in real time by the thermometer; S43. When γ i > 20%, it indicates that the bulge is severe, the state of the lithium battery (6) is poor, and the safety level is Grade IV.

7. The integrated power supply for rail transit according to claim 6, wherein: The processing strategy in S5 is as follows: S51. When the safety level is level I and level II, charge normally without treatment; S52. When the safety level is level III, it is necessary to increase the power of the fan (15), strengthen heat dissipation, and shorten the detection cycle; S53. When the safety level is level IV, directly disconnect the charging plug and alarm.

8. An integrated power supply for rail transit according to claim 7, characterized in that: The side of the battery box (1) is fastened with a box cover (17). The upper end of the box cover (17) is provided with a heat dissipation hole (19). The upper end of the heat dissipation hole (19) is fastened with a ventilation cap (20). The upper end of the ventilation cap (20) is fastened with an induction spring (21). The upper end of the induction spring (21) is fastened with a cover body (22). The inside of the box cover (17) is provided with a water cooling component.

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