Vehicle-mounted smoke sensor integrating humidity detection and humidity alarm

Abstract

The utility model discloses a vehicle-mounted smoke sensor integrating humidity detection and humidity alarm, and relates to the technical field of smoke sensors. Comprising an upper shell and a lower shell clamped with the upper shell, a fixed connecting plate and an optical mounting frame are detachably mounted in the upper shell through screws, a photoelectric receiving tube is detachably mounted on the optical mounting frame, a through hole is formed in the side wall of the upper shell, and an optical lens and a control circuit are arranged on the optical mounting frame; the control circuit comprises a smoke detection circuit, a temperature detection circuit and a humidity detection circuit. The vehicle-mounted smoke sensor integrating humidity detection and humidity alarm is good in integration level and rich in detection data variety, and has the functions of smoke concentration detection, temperature detection and humidity detection in one product. The sensor can better adapt to the environment in the battery pack, and the integration strategy of the sensor does not exist temporarily; both the detection mode and the alarm logic strategy accord with the objective environment in the battery pack, so that the detection result is effective and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke sensors, in particular to a vehicle-mounted smoke sensor integrating humidity detection and humidity alarm. Background Art

[0002] At present, with the popularization of new energy vehicles and the gradual improvement of battery pack safety performance requirements, the prevention and management requirements of battery packs for thermal runaway are also increasing, so the installation rate of smoke sensors is gradually increasing, but usually only the smoke concentration is detected.

[0003] On the other hand, due to the large current of the battery pack, when the power of the whole vehicle is high, the heating of the battery pack will be more serious, which has a greater impact on the performance. Therefore, some battery packs are equipped with liquid cooling radiators to ensure that the temperature of the battery pack is reduced within a certain range. However, if the coolant leaks in the battery pack, it will cause a series of faults such as short circuits, which is also a threat to the safety of the whole vehicle. Therefore, the detection of cooling leakage events is also very important. However, there is currently no sensor device in the battery pack that can detect both humidity and smoke concentration at the same time. In view of this, we propose an on-board smoke sensor that integrates humidity detection and humidity alarm. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm, comprising an upper shell and a lower shell clamped with the upper shell, the interior of the upper shell is detachably mounted with a fixed connecting plate and an optical mounting frame by screws, a photoelectric receiving tube is detachably mounted on the optical mounting frame, a through hole is opened on the side wall of the upper shell, and a connecting tube is clamped in the through hole, a light-emitting tube is detachably mounted on the opposite side of the photoelectric receiving tube, an optical lens and a control circuit are arranged on the optical mounting frame, and the control circuit includes a smoke detection circuit, a temperature detection circuit and a humidity detection circuit.

[0006] Optionally, the smoke detection circuit includes a photoelectric receiving tube PD1 and an infrared emitting tube LED2, the C end of the photoelectric receiving tube PD1 is electrically connected to the +3.3V end, the E end of the photoelectric receiving tube PD1 is electrically connected to one end of a resistor R8, and the other end of the resistor R8 is grounded.

[0007] Optionally, the positive electrode of the infrared emitting tube LED2 is electrically connected to the +3.3V terminal, the negative electrode of the infrared emitting tube LED2 is electrically connected to the C terminal of the diode Q1, the E terminal of the diode Q1 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is grounded, the B terminal of the diode Q1 is electrically connected to the 1 terminal of the smoke sensor D1, the 2 terminal of the smoke sensor D1 is grounded, the E terminal of the photoelectric receiving tube PD1 is electrically connected to one end of the resistor R10, the other end of the resistor R10 is grounded, and the E terminal of the photoelectric receiving tube PD1 is also electrically connected to the SMOKE_OPI_INP_PC9_P45 terminal.

[0008] Optionally, the temperature detection circuit includes a thermistor RT1, two ends of the thermistor RT1 are grounded, one end of the thermistor RT1 is electrically connected to one end of a resistor R26, the other end of the resistor R26 is electrically connected to a +3.3V end, and one end of the thermistor RT1 is electrically connected to a TEMP_ADC_IN_PG4_P38 end.

[0009] Optionally, the model of the thermistor RT1 is NTC0603.

[0010] Optionally, the humidity detection circuit includes a humidity-sensitive resistor RH1, wherein two ends of the humidity-sensitive resistor RH1 are electrically connected to the RH_CT- end, one end of the humidity-sensitive resistor RH1 is electrically connected to one end of a resistor R13, the other end of the resistor R13 is electrically connected to the RH_ADC_DET end, the resistor R13 is electrically connected to one end of a resistor R12, and the other end of the resistor R12 is electrically connected to the RT_CT+ end.

[0011] The utility model provides a vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm. It has the following beneficial effects:

[0012] The vehicle smoke sensor with integrated humidity detection and humidity alarm has good integration and rich detection data types, and can detect smoke concentration, temperature, and humidity in one product. It is well adapted to the environment inside the battery pack, and there is no integration strategy for this sensor yet; both the detection method and the alarm logic strategy are very consistent with the objective environment inside the battery pack, making the detection results effective and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the smoke detection circuit of the utility model;

[0014] Figure 2 It is a schematic diagram of the temperature detection circuit of the utility model;

[0015] Figure 3 It is a schematic diagram of the humidity monitoring circuit of the utility model;

[0016] Figure 4 It is a schematic diagram of the structure of the overall device of the utility model.

[0017] In the figure: 1. lower shell; 2. screws; 3. fixed connecting plate; 4. optical mounting frame; 5. upper shell; 6. socket; 7. connecting pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-Figure 4 The utility model provides a technical solution: a vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm, comprising an upper shell 5 and a lower shell 1 connected to the upper shell 5, wherein a fixed connecting plate 3 and an optical mounting frame 4 are detachably mounted inside the upper shell 5 by means of screws 2, and a photoelectric receiving tube is detachably mounted on the optical mounting frame 4, a through hole is provided on the side wall of the upper shell 5, and a connecting tube 7 is connected in the through hole, and a light-emitting tube is detachably mounted on the opposite side of the photoelectric receiving tube, and an optical lens and a control circuit are arranged on the optical mounting frame 4, and the control circuit includes a smoke detection circuit, a temperature detection circuit and a humidity detection circuit. A rectangular vent is provided on the side wall of the upper shell 5 to ensure the air circulation in the smoke sensor.

[0020] In this embodiment, the smoke detection circuit includes a photoelectric receiving tube PD1 and an infrared emitting tube LED2, the C terminal of the photoelectric receiving tube PD1 is electrically connected to the +3.3V terminal, the E terminal of the photoelectric receiving tube PD1 is electrically connected to one end of the resistor R8, and the other end of the resistor R8 is grounded. The positive electrode of the infrared emitting tube LED2 is electrically connected to the +3.3V terminal, the negative electrode of the infrared emitting tube LED2 is electrically connected to the C terminal of the diode Q1, the E terminal of the diode Q1 is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is grounded, the B terminal of the diode Q1 is electrically connected to the 1 terminal of the smoke sensor D1, and the 2 terminal of the smoke sensor D1 is grounded, the E terminal of the photoelectric receiving tube PD1 is electrically connected to one end of the resistor R10, and the other end of the resistor R10 is grounded, and the E terminal of the photoelectric receiving tube PD1 is also electrically connected to the SMOKE_OPI_INP_PC9_P45 terminal.

[0021] In addition, the temperature detection circuit includes a thermistor RT1, two ends of the thermistor RT1 are grounded, one end of the thermistor RT1 is electrically connected to one end of the resistor R26, the other end of the resistor R26 is electrically connected to the +3.3V end, and one end of the thermistor RT1 is electrically connected to the TEMP_ADC_IN_PG4_P38 end. The model of the thermistor RT1 is NTC0603. The thermistor RT1 collects temperature data in real time for smoke detection compensation and humidity data mapping.

[0022] It is worth noting that the humidity detection circuit includes a humidity-sensitive resistor RH1, the two ends of the humidity-sensitive resistor RH1 are electrically connected to the RH_CT- end, the one end of the humidity-sensitive resistor RH1 is electrically connected to one end of the resistor R13, the other end of the resistor R13 is electrically connected to the RH_ADC_DET end, the resistor R13 is electrically connected to one end of the resistor R12, and the other end of the resistor R12 is electrically connected to the RT_CT+ end.

[0023] The detection principle of the humistor and the relative humidity are affected by temperature. Therefore, under the same humidity, the resistance of the humistor is different at different temperatures. When this product is integrated into the battery pack of new energy vehicles, the alarm strategy for abnormal humidity must be rigorous and match the working environment. Since the environment inside the battery pack is relatively closed and stable, the humidity should be relatively stable and change slowly under normal working conditions. If a coolant leak occurs, the humidity in the battery pack will rise at a faster rate. In the judgment, the humidity rise rate of 5% / s and the relative humidity reaching 70% must be met at the same time to trigger the humidity alarm, and the alarm mark must be cleared when the humidity returns to below 70%.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm, characterized in that: The invention comprises an upper shell (5) and a lower shell (1) clamped with the upper shell (5); a fixed connecting plate (3) and an optical mounting frame (4) are detachably mounted inside the upper shell (5) by means of screws (2); a photoelectric receiving tube is detachably mounted on the optical mounting frame (4); a through hole is provided on the side wall of the upper shell (5), and a connecting tube (7) is clamped in the through hole; a light-emitting tube is detachably mounted on the opposite side of the photoelectric receiving tube; an optical lens and a control circuit are arranged on the optical mounting frame (4); the control circuit comprises a smoke detection circuit, a temperature detection circuit and a humidity detection circuit.

2. The vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm according to claim 1, characterized in that: The smoke detection circuit includes a photoelectric receiving tube PD1 and an infrared emitting tube LED2. The C end of the photoelectric receiving tube PD1 is electrically connected to the +3.3V end. The E end of the photoelectric receiving tube PD1 is electrically connected to one end of a resistor R8. The other end of the resistor R8 is grounded.

3. The vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm according to claim 2, characterized in that: The positive electrode of the infrared emitting tube LED2 is electrically connected to the +3.3V terminal, the negative electrode of the infrared emitting tube LED2 is electrically connected to the C terminal of the diode Q1, the E terminal of the diode Q1 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is grounded, the B terminal of the diode Q1 is electrically connected to the 1 terminal of the smoke sensor D1, the 2 terminal of the smoke sensor D1 is grounded, the E terminal of the photoelectric receiving tube PD1 is electrically connected to one end of the resistor R10, the other end of the resistor R10 is grounded, and the E terminal of the photoelectric receiving tube PD1 is also electrically connected to the SMOKE_OPI_INP_PC9_P45 terminal.

4. The vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm according to claim 1, characterized in that: The temperature detection circuit includes a thermistor RT1, two ends of the thermistor RT1 are grounded, one end of the thermistor RT1 is electrically connected to one end of a resistor R26, the other end of the resistor R26 is electrically connected to a +3.3V end, and one end of the thermistor RT1 is electrically connected to a TEMP_ADC_IN_PG4_P38 end.

5. The vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm according to claim 4, characterized in that: The model of the thermistor RT1 is NTC0603.

6. The vehicle-mounted smoke sensor with integrated humidity detection and humidity alarm according to claim 1, characterized in that: The humidity detection circuit includes a humidity-sensitive resistor RH1, two ends of which are electrically connected to the RH_CT- end, one end of which is electrically connected to one end of a resistor R13, the other end of which is electrically connected to the RH_ADC_DET end, the resistor R13 is electrically connected to one end of a resistor R12, and the other end of which is electrically connected to the RT_CT+ end.

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