Liquid leakage detection sensor and system

Abstract

The utility model discloses a liquid leakage detection sensor and system, the liquid leakage detection sensor comprises at least one detection module and a connector, the detection module comprises a first probe and a second probe, and the first probe and the second probe are respectively connected to different terminals of the connector through different connecting lines. The connector is configured to connect a battery management system. As the liquid leakage detection sensor is connected with the battery management system through the connector, the liquid leakage detection sensor can be quickly connected with the battery management system, the assembly mode is simple, and the disassembly is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a liquid leakage detection technology especially relates to a liquid leakage detection sensor and system. BACKGROUND

[0002] When the cooling liquid of the battery of the new energy vehicle leaks, if the power battery management system cannot detect the leakage of the cooling liquid in time and play the alarm function, the battery temperature may be too high, and further cause a safety accident. Therefore, the liquid leakage detection system plays an important role in the field of new energy vehicles. However, the battery leakage detection system on the market still needs to be improved:

[0003] The detection module of the existing sensor is connected with the battery management system through a connecting line, and the connecting line is welded with the circuit board of the battery management system. However, since the connecting line is directly welded with the circuit board of the battery management system, the sensor has the problem of difficult assembly and is difficult to separate from the battery management system as a whole. At the same time, the detection module of the sensor is also difficult to disassemble after being installed at the detection position. Moreover, when the detection module of the sensor is installed at the detection position for liquid leakage detection, the whole is vertically arranged, and the probe extends downward. In actual application, the liquid leakage detection height is high, that is, a large amount of liquid leakage is required to make the liquid level reach a large height to detect the liquid leakage, which cannot quickly detect and respond to the liquid leakage behavior. In addition, the above arrangement of the detection module also leads to a large overall height and volume of the detection module, which has certain requirements for the vertical space of the use environment, and has large space limitations. Furthermore, the existing sensor generally only includes one detection module, which can only be installed at one position of the detection area, and it is difficult to ensure quick detection and response to the liquid leakage behavior. SUMMARY

[0004] The utility model aims at providing a kind of liquid leakage detection sensor and system, so that liquid leakage detection sensor can be quickly connected to battery management system, and assembly mode is simple and easy to disassemble.

[0005] In order to achieve the above purpose, the utility model embodiment provides a kind of liquid leakage detection sensor, the liquid leakage detection sensor includes at least one detection module and connector, the detection module includes first probe and second probe, the first probe and the second probe are connected to different terminals of the connector by different connecting lines, and the connector is configured to connect battery management system.

[0006] Optionally, the detection module is formed with a horizontal mounting surface, and the detection module is mounted at the liquid leakage detection position through the horizontal mounting surface. The probe module includes a housing, and the first probe and the second probe are arranged in the housing. The detection end of the first probe and the detection end of the second probe extend laterally from the housing.

[0007] Optionally, the detection module is flat in vertical direction.

[0008] Optionally, the extension directions of the detection ends of the first probe and the second probe are parallel to the horizontal installation surface.

[0009] Optionally, the detection module is configured to be installed to a liquid leakage detection position in a horizontal sliding manner; two elastic arms are integrally arranged on the two sides of the shell, the elastic arms have a connecting end at the rear side and a free end at the front side, a clamping protrusion is arranged on the outer side of the elastic arm between the connecting end and the free end, the two elastic arms are configured to be installed on the inner sides of two opposite side plates of the liquid leakage detection position, and the clamping protrusions are configured to be clamped into or out of clamping grooves on the side plates through elastic deformation of the elastic arms.

[0010] Optionally, the detection module comprises a circuit board and a resistor arranged on the circuit board, the first probe and the second probe are connected to the circuit board, the resistor is connected between the first probe and the second probe through a circuit on the circuit board, the connecting line is welded to the circuit board and connected to the corresponding first probe and second probe through the circuit on the circuit board, and the circuit board, the resistor, the first probe, the second probe and the position where the connecting line is welded to the circuit board are arranged in the shell through injection molding.

[0011] Optionally, the liquid leakage detection sensor comprises a plurality of detection modules, and the plurality of detection modules are configured to be distributed at different positions of a liquid leakage detection area.

[0012] Optionally, the detection module comprises a first detection module and a second detection module; the first probe of the first detection module and the first probe of the second detection module are respectively connected to a first terminal of the same connector through the corresponding connecting lines.

[0013] Optionally, the second probe of the first detection module and the second probe of the second detection module are respectively connected to a second terminal of the same connector through the corresponding connecting lines.

[0014] In order to achieve the above-mentioned purpose, the utility model embodiment further provides a liquid leakage detection system, comprising a battery management system and the liquid leakage detection sensor as any one of the preceding embodiments, the liquid leakage detection sensor is connected with the matching circuit of the battery management system through the connector.

[0015] In order to achieve the above-mentioned purpose, the utility model embodiment further provides a liquid leakage detection system, comprising a battery management system and the liquid leakage detection sensor as any one of the preceding embodiments, the liquid leakage detection sensor is connected with the matching circuit of the battery management system through the connector.

[0016] The first probe and the second probe of the first detection module are connected with a first resistor, and the first probe and the second probe of the second detection module are connected with a second resistor;

[0017] The matching circuit comprises a first matching resistor, a second matching resistor, a first power supply, a second power supply, a first diode, a second diode, a third matching resistor and a fourth matching resistor;

[0018] First ends of the first resistor and the second resistor are grounded through the first matching resistor, and second ends of the first resistor and the second resistor are connected with first ends of the second matching resistor;

[0019] A positive pole of the first power supply is connected with a cathode of the first diode, an anode of the first diode is connected with a cathode of the second diode and a second end of the second matching resistor, and an anode of the second diode is grounded;

[0020] A positive pole of the second power supply is connected with a first end of the third matching resistor, a second end of the third matching resistor is connected with a second end of the second matching resistor and a first end of the fourth matching resistor and serves as a voltage collection point, and a second end of the fourth matching resistor is grounded.

[0021] In the embodiment of the utility model, the leakage detection sensor comprises a plurality of detection modules and a connector, the first probe and the second probe of the detection module are connected to different terminals of the connector through connecting lines respectively, and the connector is configured to be connected with the battery management system. Since the leakage detection sensor is connected with the battery management system through the connector, quick connection with the battery management system can be realized, and the assembly mode is simple and convenient for disassembly. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a structural schematic diagram of a leakage detection sensor according to an embodiment of the utility model.

[0023] Figure 2 FIG. 2 is an exploded structural schematic diagram of the leakage detection sensor according to the embodiment of the utility model.

[0024] Figure 3 FIG. 3 is a circuit diagram of the leakage detection sensor according to the embodiment of the utility model.

[0025] Figure 4 FIG. 4 is a circuit diagram of a leakage detection sensor according to another embodiment of the utility model.

[0026] Figure 5 FIG. 5 is a structural schematic diagram of a detection module according to an embodiment of the utility model.

[0027] Figure 6 FIG. 6 is an exploded structural schematic diagram of the detection module according to the embodiment of the utility model.

[0028] Figure 7 is a front view of the detection module in the embodiment of the utility model.

[0029] Figure 8 is a back view of the detection module in the embodiment of the utility model.

[0030] Figure 9 is a side view of the detection module in the embodiment of the utility model.

[0031] Figure 10 is a circuit schematic diagram of the liquid leakage detection system and air contact in the embodiment of the utility model.

[0032] Figure 11 is a circuit schematic diagram of the liquid leakage detection system and resistance 20kΩ liquid medium contact in the embodiment of the utility model.

[0033] Figure 12 is a circuit schematic diagram of the liquid leakage detection system and resistance 200kΩ liquid medium contact in the embodiment of the utility model.

[0034] Figure 13 is a circuit schematic diagram of the liquid leakage detection system and resistance 500kΩ liquid medium contact in the embodiment of the utility model.

[0035] Figure 14 is a circuit schematic diagram of the liquid leakage detection system and resistance 1MΩ liquid medium contact in the embodiment of the utility model.

[0036] Figure 15 is a circuit schematic diagram of the liquid leakage detection system and resistance 4MΩ liquid medium contact in the embodiment of the utility model. DETAILED DESCRIPTION

[0037] To make the above objects, features and advantages of the utility model more apparent, clear and easy to understand, the specific implementation manners of the utility model will be described in detail below in conjunction with the drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the utility model. But the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, therefore the utility model is not limited by the following disclosed specific embodiments.

[0038] To make the above objects, features and advantages of the utility model more apparent, clear and easy to understand, the specific implementation manners of the utility model will be described in detail below in conjunction with the drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the utility model. But the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, therefore the utility model is not limited by the following disclosed specific embodiments.

[0039] Please refer to Figures 1 to 9The utility model embodiment discloses a kind of liquid leakage detection sensors 1.The liquid leakage detection sensor 1 can be used for new energy automobile battery cooling liquid leakage detection etc., when being used for new energy automobile battery cooling liquid leakage detection, liquid leakage detection sensor 1 can be connected to battery management system (BMS) to judge the leakage condition of battery cooling liquid.

[0040] Please refer to Figure 5 Liquid leakage detection sensor 1 includes at least one detection module T, and detection module T is used to install in liquid leakage detection position and carry out liquid leakage detection.Detection module T can include first probe TA and second probe TB, and first probe TA and second probe TB can be arranged in shell 30.Specifically, the material of shell 30 is plastic, but not limited to this.

[0041] Please refer to Figures 1 to 3 In some embodiments, liquid leakage detection sensor 1 further includes connector 10, and first probe TA and second probe TB are respectively connected to different terminals of connector 10 through different connecting lines 20, and connector 10 is configured to be connected to battery management system.Because liquid leakage detection sensor 1 is connected to battery management system through connector 10, it can be quickly connected to battery management system, and the assembly mode is simple and convenient to disassemble.

[0042] Specifically, battery management system can be provided with corresponding plug-in docking connector on its circuit board.

[0043] In some embodiments, detection module T is formed with horizontal installation surface 31 (as shown in Figure 9 Detection module T is installed in liquid leakage detection position through horizontal installation surface 31.The detection end of first probe TA and the detection end of second probe TB are laterally extended by shell 30.It needs to be explained that horizontal installation surface 31 means that when detection module T is installed in horizontal detection surface, corresponding installation surface is in horizontal state.Horizontal installation surface 31 is not limited to continuous plane, for example, it can be the plane defined by several separately arranged support parts.

[0044] Since the detection end of the first probe TA and the detection end of the second probe TB extend laterally from the shell 30 rather than vertically downward from above, the overall height of the detection module T is reduced, and the vertical space requirement of the detection module T for the detection environment is reduced. In addition, considering the diffusion problem caused by the leakage liquid and the inertia of the vehicle during driving in the vehicle application scenario, compared with the longitudinal probe which relies on the continuous and stable vertical liquid column to form immersion on the probe needle to realize the leakage detection, the lateral probe used in this embodiment can better utilize the probe body extending from the shell 30, which is beneficial to reduce the actual leakage detection height, in other words, the leakage can be detected when the leakage amount is relatively small, and the rapid detection of the leakage condition is realized, so that a rapid response can be made.

[0045] Specifically, the horizontal installation surface 31 is formed in the shell 30.

[0046] Specifically, the detection module T is flat in the vertical direction. Here, the "vertical direction" refers to the direction perpendicular to the horizontal installation surface 31.

[0047] Since the detection module T is flat in the vertical direction when it is installed at the leakage detection position through the horizontal installation surface 31, compared with the vertical detection design of the detection module T, the overall height of the detection module T can be significantly reduced, which is more suitable for the situation where the detection environment height is limited, and is also more beneficial to reduce the leakage detection height of the detection module T to detect the leakage behavior more quickly.

[0048] Specifically, the detection end of the first probe TA and the detection end of the second probe TB are lower than the shell 30 in the vertical direction, so as to reduce the overall height and the leakage detection height of the detection module T.

[0049] On the premise that the detection module T is flat in the vertical direction, the design that the detection end of the stacked probe is lower than the shell 30 in the vertical direction can ensure that the overall height and the leakage detection height of the detection module T are significantly reduced.

[0050] More specifically, the extension direction of the detection end of the first probe TA and the detection end of the second probe TB is parallel to the horizontal installation surface 31.

[0051] Please refer to Figure 9 In a specific example, the vertical distance between the lower edge of the detection end of the first probe TA and the detection end of the second probe TB and the horizontal installation surface 31 is 3.2 mm, that is, the leakage detection height can reach 3.2 mm, which realizes the significant reduction of the leakage detection height and realizes the rapid detection and response of the leakage.

[0052] In some embodiments, the detection module T is configured to be installed to the liquid leakage detection position in a horizontal sliding manner. The two elastic arms 32 (part of the shell 30) are integrally arranged on the two sides of the shell 30, and have a connecting end 321 (i.e. the end connected to the main body structure of the shell 30) at the rear side and a free end 322 at the front side (the sliding direction during installation is defined as front), and a clamping protrusion 323 is arranged on the outer side of the elastic arm 32 between the connecting end 321 and the free end 322. In order to assemble and fix the detection module T, a corresponding assembly structure (not shown in the figure) can be fixed at the liquid leakage detection position, which can include two opposite side plates, and the clamping grooves are arranged on the two side plates respectively. When the detection module T is slidably assembled to the liquid leakage detection position, the two elastic arms 32 slide along the inner sides of the two side plates respectively, and the elastic arm 32 elastically deforms inwardly when the clamping protrusion 323 moves to the inner side of the side plate, and the elastic arm 32 elastically returns outwardly when the clamping protrusion 323 moves to the corresponding clamping groove, so that the clamping protrusion 323 is clamped in the clamping groove, and the assembly of the detection module T is completed. When it is necessary to disassemble the detection module T, the two elastic arms 32 can be pressed outwardly, so that the clamping protrusion 323 is withdrawn from the clamping groove, and then the detection module T can be pulled out. In addition, when the connector 10 is arranged at the end of the liquid leakage detection sensor 1 away from the detection module T, and in combination with the above disassembly design of the detection module T, the overall disassembly of the liquid leakage detection sensor 1 is easy, and it is convenient to carry for installation at any time.

[0053] Specifically, the first probe TA and the second probe TB are both extended forward from the front side of the shell 30.

[0054] Specifically, in order to easily disassemble the detection module T, after the assembly of the detection module T is completed, the free end 322 of the elastic arm 32 protrudes forward beyond the side plate.

[0055] Specifically, the front end of the elastic arm 32 protrudes forward beyond the main body structure of the shell 30, which is beneficial to reduce the overall volume of the detection module T.

[0056] Specifically, the assembly structure arranged at the liquid leakage detection position includes a top plate and two side plates connected to the two sides of the top plate, and the bottom ends of the two side plates can be formed into two mounting plates by extending outwardly and bending. The assembly structure is mounted on the mounting surface by the mounting plate, which can be fixed by screws, welding, etc.

[0057] In some embodiments, the detection module T includes a circuit board 60 and a resistor R arranged on the circuit board 60, the first probe TA and the second probe TB are connected to the circuit board 60, the resistor R is connected between the first probe TA and the second probe TB through a circuit on the circuit board 60, the connecting line 20 is welded to the circuit board 60 and connected to the corresponding first probe TA and second probe TB through the circuit on the circuit board 60, and the circuit board 60, the resistor R, the first probe TA, the second probe TB and the position where the connecting line 20 is welded to the circuit board 60 are arranged in the shell 30 by injection molding. Since the resistor R, the first probe TA, the second probe TB and the position where the connecting line 20 is welded to the circuit board 60 are arranged in the shell 30 by injection molding, the detection module T can have good waterproof and dustproof effects.

[0058] Specifically, the shell 30 can be made of Thermelt HV material and subjected to low-pressure injection molding, and the protection level can reach IP67, having good airtightness. In addition, the Thermelt HV material also has good flame retardant effect, and the flame retardant level can reach UL94-V0.

[0059] Specifically, the resistor R is a car-grade chip resistor.

[0060] Specifically, the first probe TA and the second probe TB are L-shaped, and the rear end thereof forms a pin C, and the circuit board 60 is formed with a jack 61, and the pin C is inserted and welded at the jack 61.

[0061] Specifically, the shell 30 includes a first shell 40 and a second shell 50, and the resistor R, the first probe TA, the second probe TB and the position where the connecting line 20 is welded to the circuit board 60 are arranged in the first shell 40 by injection molding. The second shell 50 is provided with a sliding installation space 51 which is open to the rear, and the first shell 40 is slidingly installed to the sliding installation space 51 from the rear to the front.

[0062] More specifically, the two sides of the first shell 40 respectively protrude outwardly to form sliding blocks 41 extending in the front-rear direction, and the two sides of the second shell 50 form sliding grooves 52, so that the first shell 40 can be slidingly installed to the sliding installation space 51 by cooperation of the sliding blocks 41 and the sliding grooves 52.

[0063] More specifically, the second shell 50 forms a front retaining wall 53 at the front side of the sliding installation space 51, the front retaining wall 53 extends rearward to form a buckling structure 54, and the bottom of the first shell 40 is formed with a corresponding clamping groove structure (not shown in the figure), when the first shell 40 is slidingly installed in place, the buckling structure 54 is buckled at the clamping groove structure, achieving reliable combination of the first shell 40 and the second shell 50.

[0064] More specifically, the second shell 50 forms a front baffle 53 on the front side of the sliding installation space 51, the front baffle 53 forms a through hole 531 corresponding to the first probe TA and the second probe TB respectively, and the detection ends of the first probe TA and the second probe TB pass through the corresponding through hole 531 when the first shell 40 slides forward.

[0065] In a specific example, two elastic arms 32 are formed on the two sides of the second shell 50.

[0066] Please refer to Figures 7 to 9 In a specific example, the vertical distance between the lower edge of the detection end of the first probe TA and the detection end of the second probe TB and the horizontal installation surface 31 is 3.2 mm, that is, the liquid leakage detection height can reach 3.2 mm, and the significant reduction of the liquid leakage detection height is realized. The height of the main part of the detection module T is 5.6 mm, and the maximum height of the detection module T is 7.2 mm. The width of the detection module T between the two elastic arms 32 is 27 mm, and the maximum width of the detection module T is 28.4 mm. In addition, the length of the part of the first probe TA and the second probe TB protruding forward beyond the shell 30 is 6.7 mm, and the lateral distance between the first probe TA and the second probe TB is 11.4 mm. As can be seen, the overall volume of the detection module T in the specific example of the utility model is small, the height is low, and the detection height is low, which is beneficial to use in a space-limited position. At the same time, it also makes the liquid leakage detection sensor 1 easy to carry.

[0067] In some embodiments, the liquid leakage detection sensor 1 includes a plurality of detection modules T, and the plurality of detection modules T are configured to be distributed at different positions of the liquid leakage detection area. Since the liquid leakage detection sensor 1 can detect a plurality of positions of the liquid leakage detection area by using a plurality of detection modules T, it is beneficial to quickly detect and respond to liquid leakage.

[0068] Specifically, the plurality of detection modules T are connected to the same connector 10, thereby facilitating disassembly and assembly.

[0069] In a specific example, the detection module T is installed on a water-cooled plate. The water-cooled plate forms a sink area, and four detection modules T are respectively installed at four corners of the sink area. Of course, this is only a use example.

[0070] In some embodiments, the detection module T includes a first detection module T1 and a second detection module T2. The first probe T1A of the first detection module T1 and the first probe T2A of the second detection module T2 are respectively connected to the first terminal PIN1 of the same connector 10 through the corresponding connection line 20; the second probe T1B of the first detection module T1 and the second probe T2B of the second detection module T2 can be respectively connected to the second terminal PIN2 of the same connector 10 through the corresponding connection line 20. Based on the above setting, the first detection module T1 and the second detection module T2 are connected to the same terminal of the connector 10, realizing the terminal sharing and parallel connection of the first detection module T1 and the second detection module T2, so that the connector 10 with the same number of terminals can connect more detection modules T, in the case of more detection modules T, the number of connectors 10 can be reduced, which is beneficial to reduce the cost, and the number of analog signal outputs can be reduced, the signal interface of the battery management system can be simplified, and the signal processing speed and response speed can be improved. Specifically, the first probe T1A and the second probe T1B of the first detection module T1 are connected by a first resistor R1, and the first probe T2A and the second probe T2B of the second detection module T2 are connected by a second resistor R2.

[0071] Specifically, the liquid leakage detection sensor 1 further includes a third detection module T3 and a fourth detection module T4. The first probe T3A of the third detection module T3 and the first probe T4A of the fourth detection module T4 are respectively connected to the third terminal PIN3 of the same connector 10 through the corresponding connection line 20, and the second probe T3B of the third detection module T3 and the second probe T4B of the fourth detection module T4 can be respectively connected to the fourth terminal PIN4 of the same connector 10 through the corresponding connection line 20.

[0072] In a specific example of four detection modules T, that is, the first detection module T1, the second detection module T2, the third detection module T3 and the fourth detection module T4 are provided at the same time.

[0073] In other embodiments, the second probe T1B of the first detection module T1 and the second probe T2B of the second detection module T2 can also be exclusively connected to different terminals of the same connector 10, and the second probe T3B of the third detection module T3 and the second probe T4B of the fourth detection module T4 can also be exclusively connected to different terminals of the same connector 10.

[0074] It should be noted that this utility model does not limit which probe TA and the second probe TB of any detection module T are used. Furthermore, for ease of distinction, the first probe TA and the second probe TB of the first detection module T1, the second detection module T2, the third detection module T3, and the fourth detection module T4 are further identified as T1A, T1B, T2A, T2B, T3A, T3B, T4A, and T4B, respectively. Specifically, a third resistor R3 is connected between the first probe T3A and the second probe T3B of the third detection module T3, and a fourth resistor R4 is connected between the first probe T4A and the second probe T4B of the fourth detection module T4.

[0075] Optionally, the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are all configured to have a resistance of 390kΩ.

[0076] Specifically, in one embodiment, if... Figure 3 Taking the design of two detection modules as a group and probes of the same group of detection modules sharing terminals as an example: the first detection module T1 and the second detection module T2 are a group, T1A and T2A share a terminal PIN2, T1B and T2B share a terminal PIN1, and so on. Four detection modules only need one four-terminal connector 10 to connect to each detection module T. This embodiment can effectively save the number of connectors and upper-level terminals.

[0077] Besides detecting leaks more quickly, this method also helps to pinpoint the leak location. Generally, since the detection modules are deployed on interconnected surfaces, as the leakage time increases, the probes of each module may come into contact with the leaking liquid. However, the host computer can determine which detection module is closer to the leak location by observing the order of changes in the feedback signals. In this embodiment, the four detection modules can be divided into two groups, deployed in two separate halves of the area, and each group can provide feedback on the leakage status of its respective half.

[0078] Under the condition of no leakage of liquid medium, the detection signal output by PIN1-PIN2 and PIN3-PIN4 is 195kΩ (the calculation process is: R1*R2 / R1+R2=R3*R4 / R3+R4=390*390 / 390+390);

[0079] Assuming the resistance of the leaking liquid is 2MΩ, if the first detection module T1 first contacts the leaking liquid, the detection signal output by PIN1-PIN2 at this time is 177.68kΩ (the calculation process is: 2000*195 / 2000+195); if the first detection module T1 and the second detection module T2 both contact the leaking liquid, the detection signal output by PIN1-PIN2 at this time is 163kΩ (the calculation process is: 2000*390 / 2000+390=326kΩ, 326*326 / 326+326=163kΩ); the case of other detection modules is similar.

[0080] Of course, in the case that the detection modules T share the terminals of the connector 10, the utility model does not limit the number of detection modules T connected by one connector 10, and does not limit that only two detection modules T share the terminals, and the connector 10 can also connect detection modules T that do not share the terminals at the same time, and in addition, more than one connector 10 can be provided.

[0081] Specifically, in another embodiment, if the four detection modules T1A, T1B, T2A and T2B share the terminals of the connector 10, the detection signal output by PIN1-PIN2, PIN2-PIN3, PIN4-PIN5 and PIN5-PIN6 can respectively reflect the leakage of the liquid medium in the four detection modules T1A, T1B, T2A and T2B. Figure 4 For example, in the case that two detection modules share the terminals of the connector 10, T1A and T2A share one terminal PIN5, T1B occupies one terminal PIN4, and T2B occupies one terminal PIN6, and so on, four detection modules need a six-terminal connector 10 to realize the connection with each detection module T; in this embodiment, the leakage of the liquid medium in the four detection modules can be respectively fed back.

[0082] The MCU can identify the input port by itself, and in the case that the liquid medium does not leak, the detection signals output by PIN1-PIN2, PIN2-PIN3, PIN4-PIN5 and PIN5-PIN6 at this time are all 390kΩ.

[0083] Assuming the resistance of the leaking liquid is 2MΩ, if the first detection module T1 first contacts the leaking liquid, the detection signal output by PIN4-PIN5 at this time is 326.36kΩ (the calculation process is: 2000*390 / 2000+390); the case of other detection modules is similar. In some embodiments, each probe is made of brass and plated with nickel on the surface, which can prevent oxidation and corrosion. Of course, the utility model does not limit this.

[0084] In some embodiments, the connecting wire 20 is made of PVC wire material (resistant to high voltage 6000VAC / 60S; working temperature in the range of -40~105℃). Of course, the utility model does not limit this.

[0085] In some embodiments, the ends of the connection lines 20 connected to the first detection module T1 and the second detection module T2 are spliced into a bundle and sleeved with a double-wall heat shrink tube.

[0086] Similarly, the ends of the connection lines 20 connected to the first detection module T1 and the fourth detection module T4 are spliced into a bundle and sleeved with a double-wall heat shrink tube.

[0087] Based on the leakage detection sensor 1 in the above example, the detection accuracy in normal state air can reach ±1% under different temperature and humidity conditions, and the detection accuracy of liquid medium under high and low temperature conditions can also reach ±1%, thereby facilitating more accurate detection of liquid leakage behavior.

[0088] Please refer to Figures 10 to 15 The utility model discloses a kind of leakage detection systems, including battery management system and the leakage detection sensor 1 as described above, and the leakage detection sensor 1 is connected with the matching circuit of battery management system by connector 10.

[0089] In some embodiments, the matching circuit includes a first matching resistor R11, a second matching resistor, a first power supply V1, a second power supply V2, a first diode D1, a second diode D2, a third matching resistor R14 and a fourth matching resistor R15. The first end of the first resistor R1 and the second resistor R2 is grounded through the first matching resistor R11, and the second end is connected to the first end of the second matching resistor. The positive electrode of the first power supply V1 and the cathode of the first diode D1 are connected, the anode of the first diode D1 is connected with the cathode of the second diode D2 and the second end of the second matching resistor, and the anode of the second diode D2 is grounded. The positive electrode of the second power supply V2 and the first end of the third matching resistor R14 are connected, the second end of the third matching resistor R14 is connected with the second end of the second matching resistor and the first end of the fourth matching resistor R15 and serves as a voltage collection point, and the second end of the fourth matching resistor R15 is grounded.

[0090] Among them, the second matching resistor includes a resistor R12 and a resistor R13 connected in series, both of which are of the same specification and have a size of 10kΩ. Of course, the utility model is not limited thereto.

[0091] Specifically, the matching circuit further includes a first capacitor C1, the first end of the first capacitor C1 is connected to the first end of the second matching resistor, and the second end of the first capacitor C1 is grounded.

[0092] In some embodiments, the matching circuit of the battery management system and the leakage detection sensor 1 generate a detection voltage signal based on the resistance value formed by the medium contacting the respective detection module and the surface of the battery. The detection voltage signal can be output to the MCU for processing, and then the detection result can be obtained.

[0093] In a specific example, the MCU analyzes and judges based on the detection voltage signal, and realizes the alarm function to alert the operator when the battery leaks.

[0094] More specifically, referring to Figures 10 to 15 the circuit in the Fluid dashed box in the figure is the analog circuit of the part of the medium contacting the surface of the battery of the leakage detection sensor 1, 100 is the matching circuit connected with the battery management system of the leakage sensor, and the remaining part is the matching circuit of the battery management system.

[0095] When the medium contacted by the probe of the leakage detection sensor 1 is air, the feedback resistance signal is 0, that is, there is no resistance in the Fluid dashed box, only the two parallel resistances (the first resistance R1 and the second resistance R2) of the product itself. In a specific example, the resistance of the first resistance R1 and the second resistance R2 is 390kΩ, and the parallel resistance value is 195kΩ (the calculation process is: R1*R2 / R1+R2). The parallel circuit of the first matching resistance R11 and the second matching resistance and the first resistance R1 and the second resistance R2 is in series, and the resistance value is 225kΩ (the calculation process is: 10+10+10+195=225). The above series circuit with a resistance value of 225K is in parallel with the fourth matching resistance R15, and the resistance value is 64.79kΩ (the calculation process is: 225*91 / 225+91=64.79). 64.79kΩ is in series with the third matching resistance R14 to divide the voltage, and the V2 input voltage is 5V. The value of the detection voltage signal at the V measurement point is 2.82V (the calculation process is: 64.79 / 64.79+50*5=2.82).

[0096] Similarly, when the leakage detection sensor 1 detects the resistance value of the leakage generated by 20kΩ, the 20kΩ resistor is connected in the dashed box, the switch S1 is closed, and the detection voltage signal is 1.93V; when the leakage detection sensor 1 detects the resistance value of the leakage generated by 200kΩ, the 200kΩ resistor is connected in the dashed box, the switch S2 is closed, and the detection voltage signal is 2.58V; when the leakage detection sensor 1 detects the resistance value of the leakage generated by 500kΩ, the 500kΩ resistor is connected in the dashed box, the switch S3 is closed, and the detection voltage signal is 2.71V; when the leakage detection sensor 1 detects the resistance value of the leakage generated by 1MΩ, the 1MΩ resistor is connected in the dashed box, the switch S4 is closed, and the detection voltage signal is 2.77V; when the leakage detection sensor 1 detects the resistance value of the leakage generated by 4MΩ, the 4MΩ resistor is connected in the dashed box, the switch S5 is closed, and the detection voltage signal is 2.81V.

[0097] The above disclosed is only the preferred embodiment of the utility model, and its role is to facilitate the understanding and implementation of the skilled in the art, of course, cannot be limited by the scope of the utility model patent, therefore, the equivalent changes made according to the utility model patent range still belong to the scope covered by the utility model.

Claims

1. A leak detection sensor, characterized by, The leakage detection sensor includes at least one detection module and a connector. The detection module includes a first probe and a second probe, which are respectively connected to different terminals of the connector via different connecting lines. The connector is configured to connect to a battery management system.

2. The leakage detection sensor as described in claim 1, characterized in that, The detection module has a horizontal mounting surface, and the detection module is installed at the leakage detection position through the horizontal mounting surface. The probe module includes a housing, with the first probe and the second probe disposed in the housing, and the detection ends of the first probe and the second probe extending laterally from the housing.

3. The leakage detection sensor as described in claim 2, characterized in that, The detection module is flat in shape overall in the vertical direction.

4. The leakage detection sensor as described in claim 2 or 3, characterized in that, The extension directions of the probe ends of the first probe and the second probe are parallel to the horizontal mounting surface.

5. The leakage detection sensor as described in claim 2 or 3, characterized in that, The detection module is configured to be installed at the leakage detection location in a horizontal sliding manner; Two elastic arms are integrally provided on both sides of the housing. Each elastic arm has a connecting end located on the rear side and a free end located on the front side. A locking protrusion is provided on the outer side of the elastic arm between the connecting end and the free end. The two elastic arms are configured to be installed on the inner side of two opposite side plates at the leakage detection position. The locking protrusion is configured to engage or disengage from the locking groove on the side plate by means of the elastic deformation of the elastic arm.

6. The leakage detection sensor as described in claim 1, characterized in that, The detection module includes a circuit board and a resistor disposed on the circuit board. The first probe and the second probe are connected to the circuit board. The resistor is connected between the first probe and the second probe through a line on the circuit board. The connecting line is soldered to the circuit board and connected to the corresponding first probe and the second probe through a line on the circuit board. The positions where the circuit board, the resistor, the first probe, the second probe, and the connecting line are soldered to the circuit board are disposed in the housing by injection molding.

7. The leakage detection sensor as described in claim 1, characterized in that, The detection module includes a first detection module and a second detection module; The first probe of the first detection module and the first probe of the second detection module are respectively connected to the first terminal of the same connector via corresponding connecting lines.

8. The leakage detection sensor as described in claim 7, characterized in that, The second probe of the first detection module and the second probe of the second detection module are respectively connected to the second terminal of the same connector via corresponding connecting lines.

9. A leakage detection system, characterized in that, It includes a battery management system and a leak detection sensor as described in any one of claims 1 to 8, wherein the leak detection sensor is connected to the matching circuit of the battery management system via the connector.

10. A leakage detection system, characterized in that, Includes a battery management system and a leak detection sensor as described in claim 7 or 8, wherein the leak detection sensor is connected to the matching circuit of the battery management system via the connector; A first resistor is connected between the first probe and the second probe of the first detection module, and a second resistor is connected between the first probe and the second probe of the second detection module. The matching circuit includes a first matching resistor, a second matching resistor, a first power supply, a second power supply, a first diode, a second diode, a third matching resistor, and a fourth matching resistor; The first terminals of the first resistor and the second resistor are grounded through the first matching resistor, and the second terminals are connected to the first terminals of the second matching resistor. The positive terminal of the first power supply is connected to the cathode of the first diode, the anode of the first diode is connected to the cathode of the second diode and the second end of the second matching resistor, and the anode of the second diode is grounded. The positive terminal of the second power supply is connected to the first end of the third matching resistor. The second end of the third matching resistor is connected to the second end of the second matching resistor and the first end of the fourth matching resistor and serves as a voltage acquisition point. The second end of the fourth matching resistor is grounded.

Images