Aerosol sensor

Abstract

The utility model relates to an aerosol sensor which comprises a shell, the shell comprises a bottom box and an upper cover which are connected with each other, and an optical path of a labyrinth structure is formed in a cavity of the bottom box; the circuit board assembly is arranged in the shell, the circuit board assembly comprises a circuit board, one surface, facing the bottom box, of the circuit board is connected with a light emitter and a light receiver which are used for detecting aerosol concentration, and an emitting head of the light emitter and a receiving head of the light receiver are respectively arranged at two ends of the optical path; the circuit board is also connected with a VOC sensor, and the VOC sensor is used for gas detection; and the supporting piece is used for placing the circuit board assembly. According to the utility model, the versatility of the aerosol sensor is increased, the accuracy of detecting the thermal runaway state of the battery pack can be improved, and the aerosol sensor is suitable for wider application scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile sensor, especially to an aerosol sensor. BACKGROUND

[0002] The aerosol sensor is generally installed in the battery pack shell and applied to the BMS system (battery management system) of a new energy vehicle to monitor abnormal runaway states of the battery pack system such as pressure abnormality, gas expansion, temperature rise, etc. In the thermal runaway state, the battery pack will release aerosol, and the aerosol sensor will alarm and transmit the signal through CAN after detecting the abnormal signal, so as to perceive the state of the battery pack of the current vehicle and improve the safety of the vehicle.

[0003] The aerosol sensor mainly applies the principle of infrared optics, and is provided with a special optical labyrinth inside. If no smoke particles are encountered during the propagation of the infrared light emitted by the LED, the infrared light will propagate in a straight line. If smoke particles are encountered, the infrared light will change the propagation path after refraction, and a part of the refracted light will be received by the PD after focusing through the lens, to generate a photoelectric current and convert it into a voltage through a sampling circuit. The aerosol sensor will determine whether to send an alarm signal according to the software strategy by calibrating the voltage corresponding to the smoke particle concentration.

[0004] As the safety requirements of vehicles are becoming higher and higher, single aerosol particle detection is not enough to reflect the thermal runaway state of the battery pack. At the same time, the application scenarios of the aerosol sensor have become more extensive, such as the need to arrange the aerosol sensor in the passenger compartment, etc. Therefore, higher requirements are put forward for the multifunctionality of the product, which not only detects aerosol particles, but also detects the air environment in the passenger compartment. SUMMARY

[0005] The utility model solves the technical problem of providing an aerosol sensor that can improve the accuracy of battery pack thermal runaway state detection and adapt to more extensive application scenarios.

[0006] The utility model solves the technical problem by adopting the following technical scheme: an aerosol sensor is provided, which comprises:

[0007] A shell is provided, which comprises a bottom box and an upper cover connected to each other, and an optical path with a labyrinth structure is formed in the cavity of the bottom box;

[0008] A circuit board assembly is arranged in the shell, which comprises a circuit board, and a light emitter and a light receiver for detecting the concentration of aerosol are connected to one side of the circuit board facing the bottom box. The emitting head of the light emitter and the receiving head of the light receiver are arranged at two ends of the optical path, respectively. The circuit board is further connected to a VOC sensor for gas detection.

[0009] A support is arranged in the shell for placing the circuit board assembly.

[0010] Further, the circuit board, the support, the bottom box and the upper cover are all provided with air holes, the air holes of the circuit board, the support, the bottom box and the upper cover are in communication with each other and are arranged opposite to each other to form a ventilation air duct.

[0011] Further, a ring-shaped mounting rack is formed around the air hole of the support, the air hole of the circuit board is sleeved on the ring-shaped mounting rack, the ring-shaped mounting rack is slightly higher than the circuit board and leaves a channel for air circulation between the ring-shaped mounting rack and the upper cover.

[0012] Further, the support is further provided with a CAN bus interface, the CAN bus interface is electrically connected with the circuit board through a pin fixed on the support.

[0013] Further, the circuit board is further connected with a main control chip and a voltage stabilizing chip, the voltage stabilizing chip is connected with a power supply for generating a 5V voltage to provide for the main control chip, the light emitter, the light receiver and the VOC sensor.

[0014] Further, the circuit board is further connected with a CAN chip, the CAN chip is connected with the pin and the main control chip respectively.

[0015] Further, the VOC sensor is arranged on a side of the circuit board facing the upper cover.

[0016] Further, the pin of the light emitter and the pin of the light receiver are electrically connected with the circuit board through the through hole on the support.

[0017] Further, a lens is arranged in the optical channel, the light emitted by the light emitter is refracted by smoke particles in the optical channel, the refracted light is focused by the lens and is received by the light receiver.

[0018] Further, the bottom box and the upper cover are connected through a buckle.

[0019] Advantages

[0020] Compared with the prior art, the utility model has the following advantages and positive effects: the utility model discloses a gas detection is carried out through the VOC sensor, can avoid the problem that single aerosol particle detection is not enough to reflect the battery pack thermal runaway state, and the VOC sensor and infrared light light path are placed in different accommodating cavities respectively, prevent the temperature change caused by infrared light from influencing the accuracy of the VOC sensor detection, can further improve the accuracy of battery pack thermal runaway state detection while ensuring that the sensor adapts to more extensive application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the appearance schematic drawing of the utility model embodiment;

[0022] Figure 2 It is the explosion drawing of the utility model embodiment;

[0023] Figure 3 It is the system block diagram of the utility model embodiment. DETAILED DESCRIPTION

[0024] The utility model will be further explained in connection with specific implementation examples. It should be understood that these examples are only used for illustrating the utility model and are not used for limiting the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0025] The embodiment of the utility model relates to an aerosol sensor, such as Figure 1 And Figure 2 As shown in the drawings, comprising:

[0026] The shell comprises an upper cover 1 and a bottom box 5 connected by buckling, wherein the cavity of the bottom box is formed with a labyrinth structure optical path 501;

[0027] The circuit board assembly 3 is placed in the shell and comprises a circuit board 307, one side of the circuit board 307 is connected with a light emitter 305 and a light receiver 306 for detecting aerosol concentration, wherein the emitting head of the light emitter 305 and the receiving head of the light receiver 306 are placed at two ends of the optical path 501 respectively, the pins thereof pass through the through hole 401 and the through hole 402 on the support 4 and are electrically connected with the circuit board 307, and one side of the circuit board 307 towards the upper cover 1 is also connected with a master control chip 301, a voltage stabilizing chip 302 and a VOC sensor 303;

[0028] The support 4 is placed in the shell and is used for placing the circuit board assembly 3.

[0029] The upper cover 1, the circuit board 307, the support 4 and the bottom box 5 are all provided with air holes 701, 702, 703 and 705, which are communicated with each other and arranged opposite to each other to form a ventilation channel. The air hole 703 around the support is provided with a ring-shaped mounting frame 704, the air hole 702 of the circuit board is sleeved on the ring-shaped mounting frame 704, and the ring-shaped mounting frame 704 is slightly higher than the circuit board 307 and leaves a channel for air circulation between the ring-shaped mounting frame 704 and the upper cover 1.

[0030] In some preferred embodiments, the circuit board assembly 3 further comprises a CAN chip 304 electrically connected with the main control chip 301, and the support 4 is further provided with a CAN bus interface 403, which is electrically connected with the circuit board 307 through a pin 404 fixed on the support, and then electrically connected with the CAN chip 304.

[0031] In another preferred embodiment, a lens 6 is arranged in the optical channel 501, and the light emitted by the light emitter 305 is refracted by the smoke particles in the optical channel 501, and the refracted light is focused by the lens 6 and received by the light receiver 306.

[0032] The functions of each component in the embodiment will be further described below. Figure 2 The functions of each component in the embodiment will be further described below.

[0033] Upper cover 1: structural shell, buckling connection with bottom box 5, protection of internal circuit board assembly 3;

[0034] Screw 2: screw fastening of circuit board assembly 3, support 4 and bottom box 5;

[0035] Circuit board assembly 3: hardware circuit carrier, realizing signal detection and electrical communication;

[0036] Main control chip 301: computing signal, computing the detected signal and performing strategy control;

[0037] VOC sensor 303: odor detection sensor, transmitting the detected gas signal to the main control chip 301 through IIC signal;

[0038] Voltage stabilizing chip 302: converting external 12V voltage to 5V to supply power to internal devices;

[0039] CAN chip 304: CAN communication with the outside world;

[0040] Light emitter 305: LED, used to emit infrared light;

[0041] Light receiver 306: photodiode, used to collect infrared light and convert physical value to electrical signal;

[0042] Support 4: carrier of the circuit board 307, fixed carrier of the light emitter 305, the light receiver 306 and the lens 6, by setting the positions of the light emitter 305, the light receiver 306 and the lens 6, a specific optical path can be achieved;

[0043] Lens 6: focusing infrared light;

[0044] Bottom box 5: snap connection with the upper cover 1, protecting the internal circuit board assembly 3.

[0045] The connection relationship of the circuit board assembly is shown in Figure 3 The modules and functions are as follows:

[0046] 5V stabilizer (i.e. stabilizing chip 302): linear stabilizer, connected with the power supply of the whole vehicle, converting the 12V voltage of the vehicle into 5V voltage to supply power to the internal devices;

[0047] CAN chip: CAN transceiver, CAN communication with the whole vehicle, transmitting signals to the upstream controller module;

[0048] MCU (i.e. main control chip 301): product internal main control chip, collecting front-end data and controlling strategy, outputting signals to the CAN transceiver, and directly awakening the upstream controller module;

[0049] LED (i.e. light emitter 305): infrared emission sensor, the MCU controls the light intensity of the LED, emitting infrared light;

[0050] PD (i.e. light receiver 306): infrared receiving diode, responsible for receiving and sensing infrared light, and outputting corresponding voltage signals according to different light intensities;

[0051] VOC module (i.e. VOC sensor 303): responsible for detecting CO, CO2 and other gases, and transmitting signals to the MCU through IIC;

[0052] After the product is powered on and works normally, the LED will emit infrared light, which will propagate along a straight line, at this time the infrared receiving sensor will not receive infrared light. When the battery pack occurs thermal runaway, various chemical reactions will occur inside, causing abnormal pressure, temperature rise, CO compounds, NO compounds, aerosol release, etc. At this time, the infrared receiving sensor PD will receive infrared light, the detected voltage signal will change, and the VOC odor detection module will also detect the corresponding gas. The MCU calculates the concentration according to the front-end collected data, and alarms according to the related threshold strategy.

Claims

1. An aerosol sensor, characterized in that, The application relates to a shell, a circuit board assembly and a support. The shell comprises a bottom box and an upper cover connected with each other, and a labyrinth optical channel is formed in the cavity of the bottom box. The circuit board assembly is arranged in the shell and comprises a circuit board, a light emitter and a light receiver connected to one side of the circuit board and used for detecting aerosol concentration, a VOC sensor connected to the circuit board and used for gas detection, and a support arranged in the shell and used for placing the circuit board assembly. The circuit board, the support, the bottom box and the upper cover are all provided with air holes, the air holes of the circuit board, the support, the bottom box and the upper cover are connected with each other and arranged in a facing mode to form a ventilation air duct.

2. The aerosol sensor of claim 1, wherein, A ring-shaped mounting rack is formed around the air hole of the support, the air hole of the circuit board is sleeved on the ring-shaped mounting rack, the ring-shaped mounting rack is slightly higher than the circuit board and leaves a channel for air circulation between the ring-shaped mounting rack and the upper cover.

3. The aerosol sensor of claim 2, wherein, A CAN bus interface is further arranged on the support and electrically connected with the circuit board through a pin fixed on the support.

4. The aerosol sensor of claim 1, wherein, The circuit board is further connected with a main control chip and a voltage stabilizing chip, the voltage stabilizing chip is connected with a power supply and used for generating 5V voltage to supply the main control chip, the light emitter, the light receiver and the VOC sensor.

5. The aerosol sensor of claim 4, wherein, The circuit board is further connected with a CAN chip, and the CAN chip is connected with the pin and the main control chip.

6. The aerosol sensor of claim 5, wherein, The VOC sensor is arranged on the side of the circuit board facing the upper cover.

7. The aerosol sensor of claim 1, wherein, The pin of the light emitter and the pin of the light receiver are electrically connected with the circuit board through the through hole on the support.

8. The aerosol sensor of claim 1, wherein, A lens is arranged in the optical channel, the light emitted by the light emitter is refracted by smoke particles in the optical channel, the refracted light is focused by the lens and received by the light receiver.

9. The aerosol sensor of claim 1, wherein, The bottom box and the upper cover are connected through buckling.

10. The aerosol sensor of claim 1, wherein, ​

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