A battery pack smoke sensor

Abstract

The utility model discloses a battery pack smoke sensor, which is arranged in the battery pack, including a control circuit board and a light source, a light receiving element and a receiving shielding cover respectively arranged on the control circuit board, the light source is used to emit light in a direction parallel to the control circuit board, the light receiving element is used to receive light and is arranged in the receiving shielding cover, a smoke inlet hole is provided on the receiving shielding cover, a light source injection hole is provided on the side of the receiving shielding cover facing the light source, the light source injection hole is arranged coaxially with the light source, the axial centerline of the light receiving element is perpendicular to the control circuit board, and the light receiving element is located below the lowest end of the light source injection hole. Beneficial effects: The present application has a simple structure, does not need to set up an optical maze, the light source and the light receiving element are arranged side by side, the volume is small, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke detection, in particular to a battery pack smoke sensor. Background Art

[0002] With the development of new energy and energy storage industries, lithium-ion batteries have become the main carrier for providing power batteries and storing energy. Due to their own particularity, lithium-ion batteries have the risk of thermal runaway. In the early stage of thermal runaway, lithium-ion batteries will produce trace amounts of smoke particles, and in the middle stage of thermal runaway, a large amount of smoke will appear. Therefore, smoke concentration can be used as an effective means to judge battery thermal runaway. Current smoke sensors are usually equipped with light-emitting elements, photosensitive elements, and smoke mazes. They judge smoke concentration based on the light scattered by smoke particles received by the photosensitive elements. They are large in size and high in cost. However, multiple battery modules are often integrated in a battery pack, and the space inside is limited. Such a large-volume smoke sensor is not suitable for installation in a battery pack. Therefore, there is an urgent need for a smoke sensor that is only used in a battery pack. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a battery pack smoke sensor, which is arranged in the battery pack, has a simple structure, does not need to set up an optical maze, and the light source and the light receiving element are arranged side by side, has a small size and low cost.

[0004] The purpose of the utility model is achieved through the following technical measures: a battery pack smoke sensor, the smoke sensor is arranged in the battery pack, including a control circuit board and a light source, a light receiving element and a receiving shielding cover respectively arranged on the control circuit board, the light source is used to emit light in a direction parallel to the control circuit board, the light receiving element is used to receive light and is arranged in the receiving shielding cover, the receiving shielding cover is provided with a smoke inlet hole, a light source injection hole is opened on the side of the receiving shielding cover facing the light source, the light source injection hole is arranged coaxially with the light source, the axial centerline of the light receiving element is perpendicular to the control circuit board, and the light receiving element is located below the lowest end of the light source injection hole.

[0005] Furthermore, it also includes a light source shielding cover, which covers the outside of the light source, and has a light source emission hole on the side of the light source shielding cover facing the receiving shielding cover, and the light source emission hole is coaxially arranged with the light source injection hole.

[0006] Furthermore, the aperture of the light source exit hole is smaller than the aperture of the light source entrance hole.

[0007] Furthermore, the receiving shielding cover includes a top plate and side plates and an end plate connected to the top plate, side plates are respectively provided on both sides of the top plate, an end plate is provided on one side of the two side plates, the light source entrance hole is provided on the end plate, and smoke inlet holes are provided on both side plates.

[0008] Furthermore, a gap is provided between the side plate and the end plate.

[0009] Furthermore, the light source is a blue light source.

[0010] Furthermore, the wavelength of the light source is 460 nm.

[0011] Furthermore, the light receiving element is a photodiode.

[0012] Furthermore, it also includes a light source adapter board, wherein the light source adapter board is arranged on the control circuit board, and the light source is arranged on the light source adapter board.

[0013] Furthermore, the receiving shielding cover is made of metal.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the application is applicable to battery packs, has a simple structure, does not require an optical maze, uses a simple optical path design, utilizes the internal space of the shielding cover to form a smoke inlet chamber, and forms a light trap by receiving the light source incident hole of the shielding cover to achieve the measurement of smoke concentration, thereby reducing the volume of the smoke detector and the cost of the smoke detector. In addition, the application sets the light source and the light receiving element side by side, and does not require the light source and the light receiving element to be set at a certain angle. The light source and the light receiving element are set compactly, further reducing the volume of the smoke detector. By optimizing the structure of the receiving shielding cover, the application can reduce the reflection of light by the receiving shielding cover, thereby reducing the interference of reflected light on the light receiving element.

[0015] The utility model is described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0018] Among them, 1. control circuit board, 2. receiving shielding cover, 3. smoke inlet hole, 4. light source shielding cover, 5. light source adapter board, 6. light source, 7. light source exit hole, 8. light source entrance hole, 9. light receiving element. DETAILED DESCRIPTION

[0019] like Figures 1 to 2As shown, a battery pack smoke sensor is arranged in the battery pack, and the smoke sensor is used to detect the smoke concentration in the battery pack. The smoke sensor includes a control circuit board 1 and a light source 6, a light receiving element 9 and a receiving shielding cover 2 respectively arranged on the control circuit board 1. Specifically, the control circuit board 1 is used to process the signal received by the light receiving element 9, and the control circuit board 1 can be a PCB board. The light source 6 is used to emit light in a direction parallel to the control circuit board 1, and the light receiving element 9 is used to receive light and is arranged in the receiving shielding cover 2. The receiving shielding cover 2 is provided with a smoke inlet 3. The receiving shielding cover 2 is provided with a light source injection hole 8 on the side facing the light source 6. The light source injection hole 8 is arranged coaxially with the light source 6. The axial center line of the light receiving element 9 is perpendicular to the control circuit board 1. The light receiving element 9 is located below the lowest end of the light source injection hole 8, and the lowest end is the point where the vertical distance between the light source injection hole 8 and the control circuit board 1 is the smallest. The present application is used to detect smoke in a battery pack. When there is no smoke in the battery pack, the light emitted by the light source 6 shines parallel to the receiving shield 2 through the light source incident hole 8. Since the light receiving element 9 is located below the lowest end of the light source incident hole 8, the light entering the receiving shield 2 cannot illuminate the light receiving element 9, that is, the light receiving element 9 cannot receive the light. When smoke is generated in the battery pack, smoke particles enter the receiving shield 2 from the smoke inlet 3, and the light shines on the smoke particles and scatters. The scattered light shines on the light receiving element 9, and the light receiving element 9 receives the scattered light, generates a signal change and transmits it to the control circuit board 1. The control circuit board 1 performs signal processing to detect the smoke concentration. The present application has a simple structure and does not require an optical maze. A simple optical path design is used, and the internal space of the receiving shielding cover 2 is used to form a smoke inlet chamber. A light trap is formed through the light source incident hole 8 of the receiving shielding cover 2 to achieve the measurement of smoke concentration, thereby reducing the volume of the smoke detector and reducing the cost of the smoke detector. In addition, the present application arranges the light source 6 and the light receiving element 9 side by side, and there is no need to arrange the light source 6 and the light receiving element 9 at a certain angle. The light source 6 and the light receiving element 9 are arranged compactly, further reducing the volume of the smoke detector.

[0020] It also includes a light source shielding cover 4, which covers the outside of the light source 6, and has a light source emission hole 7 on the side facing the receiving shielding cover 2, and the light source emission hole 7 is coaxially arranged with the light source injection hole 8. The light source shielding cover 4 shields part of the light and filters the light, and the light source shielding cover 4 cooperates with the receiving shielding cover 2 to make the light injected into the receiving shielding cover 2 parallel light or close to parallel light.

[0021] The aperture of the light source exit hole 7 is smaller than the aperture of the light source entrance hole 8 , so that the light emitted from the light source exit hole 7 can enter the light source entrance hole 8 , ensuring that the light can enter the receiving shielding cover 2 .

[0022] The receiving shielding cover 2 includes a top plate and a side plate and an end plate connected to the top plate. A side plate is provided on each side of the top plate, and an end plate is provided on one side of the two side plates. The light source injection hole 8 is provided on the end plate, and both side plates are provided with a smoke inlet hole 3. Both side plates are provided with a smoke inlet hole 3, which allows smoke to enter the receiving shielding cover 2. At the same time, only one end plate is provided, so that an open end is formed on the side opposite to the end plate. When there is no smoke in the receiving shielding cover 2, light is irradiated into the receiving shielding cover 2 from the light source injection hole 8 and can be emitted from the receiving shielding cover 2 from the open end, thereby reducing the reflection of light by the receiving shielding cover 2, and further reducing the interference of the reflected light on the light receiving element 9.

[0023] A gap is provided between the side plate and the end plate, through which smoke particles can enter the receiving shielding cover 2 , and the receiving shielding cover 2 forms a plurality of smoke entry channels, which can facilitate smoke particles to quickly enter the receiving shielding cover 2 .

[0024] The light source 6 is a blue light source. Further preferably, the wavelength of the light source 6 is 460 nm.

[0025] The light receiving element 9 is a photodiode.

[0026] It also includes a light source adapter board 5 , which is arranged on the control circuit board 1 , and the light source 6 is arranged on the light source adapter board 5 .

[0027] The receiving shielding cover 2 is made of metal.

[0028] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.

[0029] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A battery pack smoke sensor, characterized in that: The smoke sensor is arranged in a battery pack, and includes a control circuit board and a light source, a light receiving element and a receiving shielding cover respectively arranged on the control circuit board. The light source is used to emit light in a direction parallel to the control circuit board. The light receiving element is used to receive light and is arranged in the receiving shielding cover. A smoke inlet hole is provided on the receiving shielding cover. A light source injection hole is provided on the side of the receiving shielding cover facing the light source. The light source injection hole is arranged coaxially with the light source. The axial centerline of the light receiving element is perpendicular to the control circuit board. The light receiving element is located below the lowest end of the light source injection hole.

2. The battery pack smoke sensor according to claim 1, characterized in that: It also includes a light source shielding cover, which covers the outside of the light source. The light source shielding cover is provided with a light source emission hole on a side facing the receiving shielding cover, and the light source emission hole is coaxially arranged with the light source injection hole.

3. The battery pack smoke sensor according to claim 2, characterized in that: The aperture of the light source exit hole is smaller than the aperture of the light source entrance hole.

4. The battery pack smoke sensor according to claim 1, characterized in that: The receiving shielding cover includes a top plate and side plates and an end plate connected to the top plate. Side plates are respectively provided on both sides of the top plate, and an end plate is provided on one side of the two side plates. The light source entrance hole is provided on the end plate, and both side plates are provided with smoke inlet holes.

5. The battery pack smoke sensor according to claim 4, characterized in that: A gap is provided between the side plate and the end plate.

6. The battery pack smoke sensor according to claim 1, characterized in that: The light source is a blue light source.

7. The battery pack smoke sensor according to claim 6, characterized in that: The wavelength of the light source is 460 nm.

8. The battery pack smoke sensor according to claim 1, characterized in that: The light receiving element is a photodiode.

9. The battery pack smoke sensor according to claim 1, characterized in that: It also includes a light source adapter board, which is arranged on the control circuit board, and the light source is arranged on the light source adapter board.

10. The battery pack smoke sensor according to claim 1, characterized in that: The receiving shielding cover is made of metal.

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