Micro-particle detection device

Abstract

The utility model discloses a microparticle detection device which comprises a shell, an optical detection cavity and two independent air channels penetrating through the optical detection cavity are arranged in the shell, a fan is further arranged in the shell and used for achieving gas exchange between the independent air channels and the outer side of the shell, and the two independent air channels are arranged side by side at intervals. The two independent air channels located in the optical detection cavity are each provided with a fracture, a light source is arranged in the interval between the two independent air channels, a photosensitive device and a lens are arranged on the two sides of each fracture respectively, the lenses are arranged close to the light sources, and the fractures, the lenses and the light sources are coaxially arranged. The battery thermal runaway early warning device has the advantages of being simple in structure, high in response speed, high in detection reliability, high in detection precision and capable of conducting timely early warning on the early stage of battery thermal runaway.

Description

Technical Field

[0001] The utility model relates to the technical field of microparticle detection, and particularly relates to a microparticle detection device. Background Art

[0002] Lithium-ion batteries are important components in energy storage power stations, playing the roles of electrical energy storage and release. Under extreme conditions such as overcharging, over-discharging, short-circuiting, and impact, intense chemical reactions are likely to occur inside lithium batteries, which may lead to thermal runaway and then fires or even explosions. Therefore, it is extremely important to achieve early monitoring and control in the initial stage of battery thermal runaway.

[0003] Currently, the early monitoring and warning of lithium-ion battery thermal runaway mostly use sensors such as temperature, smoke, and gas sensors. However, the responses of temperature and smoke are relatively lagging, and gas monitoring is prone to mutual interference. Moreover, most traditional temperature sensors, smoke sensors, etc. adopt passive monitoring methods, while battery thermal runaway has the characteristic of rapid development. Therefore, the traditional sensors are relatively lagging in monitoring thermal runaway and cannot give early warnings in the early stage of thermal runaway, and the thermal runaway protection is not timely enough. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a microparticle detection device with a simple structure, fast response speed, strong detection reliability, high detection accuracy, and capable of giving timely early warnings for the early stage of battery thermal runaway.

[0005] The purpose of the utility model is achieved by the following technical measures: A microparticle detection device includes a housing. An optical detection cavity is provided inside the housing, and two independent air ducts passing through the optical detection cavity are provided. A fan is also provided inside the housing, and the fan is used to realize gas exchange between the independent air ducts and the outside of the housing. The two independent air ducts are arranged side by side at intervals, and both of the two independent air ducts located inside the optical detection cavity are provided with breaks. A light source is provided in the interval between the two independent air ducts. A photosensitive device and a lens are respectively provided on both sides of the break. The lens is arranged close to the light source, and the break, the lens, and the light source are coaxially arranged.

[0006] Further, the fan is an inhalation fan.

[0007] Further, the lens and the photosensitive device have the same diameter.

[0008] Further, an air vent is provided on the housing, a fan chamber is provided inside the housing, the fan is arranged in the fan chamber, one ends of the two independent air ducts are respectively communicated with the fan chamber, and the other ends of the two independent air ducts are respectively connected with the air vent.

[0009] Further, a circuit board is also provided inside the housing, and the light source, the photosensitive device, and the lens are all arranged on the circuit board.

[0010] Further, an MCU module is also provided inside the housing, and the MCU module is connected to the circuit board.

[0011] Further, the photosensitive device is a photosensitive sensor.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: The structure of this application is simple. By adopting two independent air ducts, dual-duct independent monitoring is realized, which can improve the reliability of detection. At the same time, the micro-particle concentrations monitored independently by the two air ducts can be compared to improve the detection accuracy. Moreover, even if one air duct of the detection device is blocked, the detection device can still have the detection function during dual-duct independent monitoring. This application uses one light source to detect two independent air ducts, which can reduce the cost of the detection device and its volume. This application uses the same fan to achieve air flow in two independent air ducts, which can keep the air flow rates in the two independent air ducts consistent, avoid detection result differences in the two independent air ducts caused by different air flow rates, and improve the detection accuracy.

[0013] The following describes the present utility model in detail with reference to the drawings and specific embodiments. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model.

[0015] Wherein, 1. Housing, 2. Optical detection cavity, 3. Independent air duct, 4. Light source, 5. Lens, 6. Photosensitive device, 7. Circuit board, 8. Fan, 9. Ventilation port, 10. MCU module. Specific Embodiments

[0016] Such as Figure 1As shown in the figure, a microparticle detection device includes a housing 1. An optical detection chamber 2 is provided inside the housing 1, and two independent air ducts 3 penetrate through the optical detection chamber 2. A fan 8 is also provided inside the housing 1. The fan 8 is used to realize the gas exchange between the independent air ducts 3 and the outside of the housing 1. The two independent air ducts 3 are arranged side by side at intervals, and both of the two independent air ducts 3 located inside the optical detection chamber 2 are provided with breaks. A light source 4 is provided in the interval between the two independent air ducts 3. Photosensitive devices 6 and lenses 5 are respectively provided on both sides of the break. The lens 5 is arranged close to the light source 4, and the break, the lens 5 and the light source 4 are coaxially arranged. The light of the light source 4 is converted into parallel light through the lens 5, and the parallel light is scattered by the air flowing in the break and irradiates on the photosensitive device 6. As the concentration of microparticles in the air changes, the detection signal of the photosensitive device 6 will also change. The change amount of this detection signal can be used as the monitoring data of the detection device. Whether the battery has a thermal runaway can be judged through the monitoring data. In this application, the air flow in the independent air duct 3 is realized by the fan 8, and the active monitoring method is adopted, which can improve the timeliness of detection. This application adopts two independent air ducts 3 to realize dual-duct independent monitoring, which can improve the reliability of detection. At the same time, the concentration of microparticles monitored independently by the dual ducts can be compared to improve the detection accuracy. Moreover, the dual-duct independent monitoring can also enable the detection device to still have the detection function after one of the air ducts of the detection device is blocked. This application realizes the detection of the dual air ducts through one light source 4, which can reduce the cost of the detection device and reduce the volume.

[0017] The fan 8 is an inhalation fan. By using the inhalation fan to inhale the air outside the housing 1 into the independent air duct 3, the concentration of microparticles in the independent air duct 3 can be quickly made consistent with the outside of the housing 1.

[0018] The lens 5 and the photosensitive device 6 have the same diameter. In this application, the positions of the photosensitive device 6 and the lens 5 are not restricted, that is, the photosensitive device 6 can be coaxially arranged with the lens 5, or the axis of the photosensitive device 6 can form an angle with the axis of the lens 5. When the photosensitive device 6 and the lens 5 are coaxially arranged, the same diameter of the photosensitive device 6 and the lens 5 enables the photosensitive device 6 to fully receive the parallel light converted by the lens 5.

[0019] An air vent 9 is provided on the housing 1. A fan chamber is provided inside the housing 1. The fan 8 is arranged in the fan chamber. One ends of the two independent air ducts 3 are respectively communicated with the fan chamber, and the other ends of the two independent air ducts 3 are respectively connected with the air vent 9. By using the same fan 8 to realize the air flow in the two independent air ducts 3, the air flow rates in the two independent air ducts 3 can be maintained consistent, avoiding the difference in the detection results of the two independent air ducts 3 caused by different air flow rates.

[0020] A circuit board 7 is also provided inside the housing 1. The light source 4, the photosensitive device 6 and the lens 5 are all arranged on the circuit board 7.

[0021] An MCU module 10 is further provided in the housing 1, and the MCU module 10 is connected to the circuit board 7. The data collected by the photosensitive device 6 and the status of the detection device can be transmitted to other master devices or the host computer system through the MCU module 10.

[0022] The photosensitive device 6 is a photosensitive sensor.

[0023] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0024] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A microparticle detection device, characterized in that: It includes a housing, an optical detection cavity is provided inside the housing, and two independent air ducts passing through the optical detection cavity. A fan is also provided inside the housing, and the fan is used to realize gas exchange between the independent air ducts and the outside of the housing. The two independent air ducts are arranged side by side at intervals, and both of the two independent air ducts located inside the optical detection cavity are provided with breaks. A light source is provided in the interval between the two independent air ducts. A photosensitive device and a lens are respectively provided on both sides of the break. The lens is arranged close to the light source, and the break, the lens and the light source are coaxially arranged.

2. The microparticle detection device according to claim 1, characterized in that: The fan is a suction fan.

3. The microparticle detection device according to claim 1, characterized in that: The lens and the photosensitive device have the same diameter.

4. The fine particle detection device according to claim 1, characterized in that: An air vent is provided on the housing. A fan chamber is provided inside the housing. The fan is arranged in the fan chamber. One ends of the two independent air ducts are respectively communicated with the fan chamber, and the other ends of the two independent air ducts are respectively connected with the air vent.

5. The microparticle detection device according to claim 1, characterized in that: A circuit board is also provided inside the housing. The light source, the photosensitive device and the lens are all arranged on the circuit board.

6. The microparticle detection device according to claim 5, characterized in that: An MCU module is also provided inside the housing. The MCU module is connected to the circuit board.

7. The microparticle detection device according to claim 1, wherein: The photosensitive device is a photosensitive sensor.

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