Liquid leakage monitoring sensor

Abstract

The utility model relates to a liquid leakage monitoring sensor, which comprises a shell, a test electrode, a circuit board, a chip resistor and a lead are regularly arranged in the shell, the shell comprises a shell body, the shell body is a hollow cylinder, and an inner cavity of the shell body is divided into two parts through a partition plate to respectively form an independent test cavity and an independent wiring cavity; the test electrode penetrates through the partition plate and is fixed together with the partition plate, the front end of the test electrode is a test end and extends into the test cavity, and the rear end of the test electrode is a wiring end and extends into the wiring cavity; and the chip resistors are regularly welded on the circuit board and are used as fixed resistors between the test electrodes. According to the liquid leakage monitoring sensor, the design that the circuit board is connected with the test electrode pole piece is adopted, the chip resistor and the wire are installed before assembly, and then the chip resistor and the wire are integrally welded with the test electrode pole piece, so that the assembly difficulty is greatly reduced, and the manufacturing cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid leakage detection sensors, in particular to a liquid leakage monitoring sensor. Background Art

[0002] With the popularity of electric vehicles, there are more and more cases of battery pack leakage or water ingress in electric vehicles, which may cause the battery pack to catch fire in serious cases. The battery pack leakage sensor can quickly identify leakage or water ingress in the battery pack. When the battery pack leaks or water ingress exceeds 1mm, the sensor will send an alarm signal to the battery pack management module.

[0003] At present, the common leakage sensor adopts the design of directly welding the plug-in resistor on the two pole pieces. This design is not beautiful, and the assembly process is relatively cumbersome, which will increase the manufacturing cost. In addition, as the car shakes during driving, it is easy to affect the change of the resistor value. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a liquid leakage monitoring sensor which has a simple and reasonable structure, low manufacturing difficulty and low cost.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A liquid leakage monitoring sensor comprises a housing, wherein a test electrode, a circuit board, a chip resistor and a wire are regularly arranged inside the housing;

[0007] The housing comprises a housing shell, which is a hollow cylinder, and its internal cavity is divided into two parts by a partition plate, forming an independent test cavity and a wiring cavity respectively;

[0008] The test electrode passes through the partition and is fixed thereto, the front end of the test electrode is a test end, which is inserted into the test cavity, and the rear end of the test electrode is a wiring end, which is inserted into the wiring cavity;

[0009] The chip resistor is regularly welded and arranged on the circuit board, and is electrically connected to the test electrodes through leads printed and arranged on the circuit board, so as to serve as a fixed resistor between the test electrodes;

[0010] The circuit board is regularly provided with through-hole pads matching with the test electrodes, and are electrically connected with the test electrodes by welding in the wiring cavity;

[0011] The wire is electrically connected to the circuit board and leads out of the wiring cavity. The wire is electrically connected to the test electrode through a lead on the circuit board.

[0012] Furthermore, the test electrode includes a first test electrode and a second test electrode, the wire includes a first wire and a second wire, and the first wire and the second wire are electrically connected to the first test electrode and the second test electrode through independent leads on the circuit board.

[0013] Furthermore, protruding guide columns are regularly arranged on the inner walls on the left and right sides of the wiring cavity, and inwardly recessed guide grooves are regularly arranged on the left and right sides at the corresponding positions of the circuit board. The circuit board is quickly positioned and assembled into the wiring cavity through the guide grooves and the guide columns, and is electrically connected to the test end at the rear end of the test electrode.

[0014] Furthermore, the housing also includes a base, and the base is regularly provided with through holes for fasteners such as bolts to pass through and fix it.

[0015] Furthermore, the base is also provided with a positioning column for convenient and quick insertion to achieve positioning.

[0016] The beneficial effects of the utility model are:

[0017] 1. The liquid leakage monitoring sensor of the utility model adopts a circuit board connected test electrode plate design. Before assembly, the chip resistor and the wire are installed first, and then the whole is welded to the test electrode plate, which greatly reduces the difficulty of assembly and greatly reduces the manufacturing cost.

[0018] 2. The liquid leakage monitoring sensor of the utility model has a lower cost of chip resistors under the same accuracy conditions, which is conducive to reducing manufacturing costs. At the same time, the chip resistor is smaller in size, and after the encapsulation epoxy glue is cured, it is less likely to deform under hot and cold shocks, so the resistance value is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 for Figure 1 Bottom view of

[0021] Figure 3 A three-dimensional view of the utility model;

[0022] Figure 4 This is a working principle diagram of the utility model;

[0023] The markings in the figure are:

[0024] 1. housing, 11. housing shell, 12. base, 13. partition, 14. guide column, 1101. test cavity, 1102. wiring cavity, 1201. through hole, 1202. positioning column;

[0025] 2. test electrode, 21. first test electrode, 22. second test electrode;

[0026] 3. Circuit board, 301, guide groove, 4. Chip resistor, 5. Wire. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] like Figure 1-4 As shown, the utility model provides a liquid leakage monitoring sensor, including a housing 1, and test electrodes 2, a circuit board 3, a chip resistor 4 and a wire 5 regularly arranged inside the housing 1.

[0030] The housing 1 includes a housing shell 11, which is a hollow shell, and its internal cavity is divided into two parts through a partition 13, forming a test cavity 1101 and a wiring cavity 1102. The test electrode 2 includes a first test electrode 21 and a second test electrode 22. The test electrode 2 passes through the partition 13 and is fixed thereto, and is parallel to and fixed in the partition 13. The front end of the test electrode 2 is a test end and extends into the test cavity 1101; the rear end is a wiring end and extends into the wiring cavity 1102.

[0031] Further, the chip resistor 4 is regularly welded and arranged on the circuit board 3, and is electrically connected to the first test electrode and the second test electrode through the lead printed on the circuit board 3, serving as a fixed resistor R0 between the first test electrode and the second test electrode. The circuit board 3 is regularly provided with through-hole pads matching the test electrode 2, and is welded and electrically connected to the through-hole pads in the wiring cavity 1102. The wire 5 includes a first wire 51 and a second wire 55, and the wire 5 is electrically connected to the circuit board 3 and leads out of the wiring cavity 1102.

[0032] Furthermore, the first conductive wire and the second conductive wire are electrically connected to the first test electrode and the second test electrode respectively through leads printed on the circuit board 3 .

[0033] like Figure 1 As shown, the partition 13 is horizontally arranged in the inner cavity of the housing 1. For the horizontally arranged partition 13, the inner cavity of the housing 1 is divided into two parts, forming a test cavity 1101 at the upper end and a wiring cavity 1102 at the lower end. The first test electrode 21 and the second test electrode 22 are arranged in parallel and regularly in the inner cavity of the housing 1, and penetrate the partition 13 and are fixed thereto. The front ends of the first test electrode and the second test electrode are test ends, which are arranged in the test cavity 1101; and the rear ends are wiring ends, which are arranged in the wiring cavity 1102.

[0034] Furthermore, through-hole pads are provided on the left and right sides of the circuit board 3 at the rear end terminals of the first test electrode 21 and the second test electrode 22. The circuit board 3 is quickly inserted into the terminals of the first test electrode and the second test electrode through the through-hole pads on the left and right sides, and is electrically connected thereto by welding.

[0035] Furthermore, the first wire 51 and the second wire 52 are regularly and electrically connected to the circuit board 3 .

[0036] The test electrode 2 and the housing 1 can be assembled by integral injection molding, so that when the housing 1 is injection molded, the test electrode 2 is directly assembled into the inner cavity of the housing 1. This also ensures that the test cavity 1101 and the wiring cavity 1102 at the upper and lower ends of the housing 1 are sealed and isolated.

[0037] In order to facilitate the rapid assembly of the circuit board 3 and the test electrode 2, as Figure 2 As shown, guide posts 14 are regularly arranged on the left and right inner walls of the wiring cavity 1102. Correspondingly, guide notches 301 are arranged at corresponding positions on the left and right sides of the circuit board 3. Through the guide posts 14 on the inner wall of the wiring cavity 1102 and the guide notches 301 on the circuit board, the circuit board 3 can be quickly positioned and assembled into the wiring cavity 1102, and quickly assembled with the test electrode 2 to wait for welding.

[0038] like Figure 2 and Figure 3 As shown, in order to facilitate the assembly of the liquid leakage monitoring sensor of the utility model into the corresponding module of the automobile, a base 12 is also provided at the bottom of the housing 1. The base 12 is regularly provided with through holes 1201 for fasteners such as bolts to pass through and fix it, and positioning columns 1202 for quick insertion into the corresponding module to achieve positioning.

[0039] like Figure 1As shown, the chip resistor 4 and the wire 5 are first welded together with the circuit board 3, and then the welded circuit board is quickly assembled with the test electrode 2 through the guide column 14 in the wiring cavity 102, and then welded to complete the preliminary assembly. Finally, the wiring cavity is sealed and packaged by applying glue and curing it inside.

[0040] like Figure 4 As shown in the figure, it is the working principle diagram of the liquid leakage monitoring sensor of the utility model, and the specific working principle is as follows:

[0041] The liquid leakage monitoring sensor of the utility model measures the leakage of liquid based on the change in resistance caused by the principle of liquid conductivity. There is a fixed resistor R0 (i.e., chip resistor 4) inside the sensor, which forms a loop together with the external resistor R1. When there is no liquid, the resistance in the loop of the first test electrode PIN1 and the second test electrode PIN2 is fixed; but when there is liquid, the resistance in the loop changes, thereby monitoring whether there is leakage of liquid.

[0042] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid leakage monitoring sensor, comprising a housing, characterized in that: The shell is regularly provided with test electrodes, circuit boards, chip resistors and wires; The housing comprises a housing shell, which is a hollow cylinder, and its internal cavity is divided into two parts by a partition plate, forming an independent test cavity and a wiring cavity respectively; The test electrode passes through the partition and is fixed thereto, the front end of the test electrode is a test end, which is inserted into the test cavity, and the rear end of the test electrode is a wiring end, which is inserted into the wiring cavity; The chip resistor is regularly welded and arranged on the circuit board, and is electrically connected to the test electrodes through leads printed and arranged on the circuit board, so as to serve as a fixed resistor between the test electrodes; The circuit board is regularly provided with through-hole pads matching with the test electrodes, and are electrically connected with the test electrodes by welding in the wiring cavity; The wire is electrically connected to the circuit board and leads out of the wiring cavity. The wire is electrically connected to the test electrode through a lead on the circuit board.

2. A liquid leakage monitoring sensor as claimed in claim 1, characterized in that: The test electrodes include a first test electrode and a second test electrode, and the wires include a first wire and a second wire, and the first wire and the second wire are electrically connected to the first test electrode and the second test electrode through independent leads on the circuit board, respectively.

3. A liquid leakage monitoring sensor as claimed in claim 1, characterized in that: Protruding guide columns are regularly arranged on the inner walls on the left and right sides of the wiring cavity, and inwardly recessed guide grooves are regularly arranged on the left and right sides at the corresponding positions of the circuit board. The circuit board is quickly positioned and assembled into the wiring cavity through the guide grooves and the guide columns, and is electrically connected to the test end at the rear end of the test electrode.

4. A liquid leakage monitoring sensor according to any one of claims 1 to 3, characterized in that: The housing also includes a base, and the base is regularly provided with through holes for bolts to pass through and fix the base.

5. A liquid leakage monitoring sensor as claimed in claim 4, characterized in that: The base is also provided with a positioning column for convenient and quick insertion to achieve positioning.

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