Smoke alarm device and battery system

Abstract

The embodiment of the utility model provides a smoke alarm device and a battery system. The smoke alarm device comprises a transmitting module, a receiving module, a reflecting module and an alarm module, the reflecting module comprises a concave mirror and is located on one side of a first light path of a first light beam transmitted by the transmitting module, and the receiving module is located on a second light path of a second light beam formed by scattering of the first light beam reflected by the reflecting module. The alarm module is connected with the receiving module. Therefore, after the smoke enters the smoke alarm device, after the first light beam emitted by the emission module is scattered by the smoke, part of the light can be emitted to the concave mirror of the reflection module and converged on the receiving module through the concave mirror, the smoke concentration can be measured in a high-gain mode, and an alarm signal is sent through the alarm device.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke alarm, and in particular to a smoke alarm device and a battery system. Background Art

[0002] GB 38031-2020 "Safety Requirements for Lithium-Ion Power Batteries for Electric Vehicles" stipulates that a pre-warning signal should be provided 5 minutes before a lithium-ion battery pack or system causes thermal diffusion due to thermal runaway of a single battery and then endangers the occupants, so as to remind the occupants to evacuate. Through early fire smoke detection and warning, the occurrence of an early fire can be advanced by 5-10 minutes, giving the driver and passengers enough time to evacuate and the vehicle controller enough time to reserve. Usually, the thermal runaway state of the battery is warned by detecting pressure, temperature or smoke concentration. However, the detection accuracy of these methods is not high. Summary of the Utility Model

[0003] In view of this, the purpose of the embodiments of the present utility model is to provide a smoke alarm device and a battery system to at least partially improve the above problems.

[0004] To achieve the above purpose, the technical solutions adopted in the embodiments of the present utility model are as follows:

[0005] In a first aspect, the embodiments of the present utility model provide a smoke alarm device, including a transmitting module, a receiving module, a reflecting module and an alarming module;

[0006] The reflecting module includes a concave mirror;

[0007] The reflecting module is located on one side of the first optical path of the first light beam emitted by the transmitting module;

[0008] The receiving module is located on the second optical path of the second light beam scattered by the reflecting module reflecting the first light beam;

[0009] The alarming module is connected to the receiving module.

[0010] Optionally, the reflecting module further includes a mirror frame for mounting the concave mirror. The mirror frame includes two brackets, and both ends of the concave mirror are respectively connected to the two brackets, and the concave mirror and the two brackets form a hollow structure.

[0011] Optionally, the transmitting module includes a transmitting diode and a divergence prevention unit;

[0012] The divergence prevention unit includes at least one isolation plate located on the first optical path and close to the emitting end of the transmitting diode;

[0013] A first conical hole is formed in the partition board, and the large-mouth end of the first conical hole faces the light-emitting diode.

[0014] Optionally, the receiving module includes a phototransistor and a light-shielding unit;

[0015] The light-shielding unit includes a light-shielding plate, and the light-shielding plate is located on the second light path and close to the receiving end of the phototransistor;

[0016] A second conical hole is formed in the light-shielding plate, and the small-mouth end of the second conical hole faces the phototransistor.

[0017] Optionally, the smoke alarm device further includes a smoke bin module, the smoke bin module includes two smoke hanging walls and at least one partition wall, the two smoke hanging walls are arranged oppositely to form a smoke bin space, and the partition wall is sandwiched between the two smoke hanging walls; the first light path passes through the smoke bin space;

[0018] The smoke hanging wall is provided with a through hole, and the through hole is a circular fence hole;

[0019] The partition wall is provided with a third conical hole, and the small-mouth end of the third conical hole faces the concave mirror.

[0020] Optionally, the central axis of the third conical hole passes through the center of the mirror surface of the concave mirror.

[0021] Optionally, the smoke alarm device further includes an enclosure member, and the enclosure member is located between the transmitting module and the reflecting module;

[0022] The enclosure member includes a first branch, a second branch and a third branch;

[0023] The second branch is located on the first branch and forms a certain angle with the first branch;

[0024] The third branch is located on the second branch and is parallel to the first branch.

[0025] Optionally, the smoke alarm device further includes a device housing, and the transmitting module, the receiving module and the reflecting module are all located in the device housing.

[0026] Optionally, the included angle between the first light beam and the second light beam is greater than or equal to 15° and less than or equal to 45°.

[0027] In a second aspect, the present invention provides a battery system, and the battery system includes a battery module and the smoke alarm device according to any one of the first aspect;

[0028] The battery module and the smoke alarm device are arranged in the same space.

[0029] A smoke alarm device and a battery system provided by an embodiment of the present utility model. The smoke alarm device includes a transmitting module, a receiving module, a reflecting module, and an alarming module. The reflecting module includes a concave mirror. The reflecting module is located on one side of the first optical path of the first light beam emitted by the transmitting module. The receiving module is located on the second optical path of the second light beam formed by the scattering of the first light beam reflected by the reflecting module. The alarming module is connected to the receiving module. The smoke alarm device further includes an enclosing member. The transmitting module includes a light divergence prevention unit. The receiving module includes a light shielding unit. The enclosing member and the light divergence prevention unit can block and absorb the light of the transmitting module, reduce the light entering the concave mirror, and lower the zero point. When smoke enters the smoke alarm device, after the first light beam emitted by the transmitting module is scattered by the smoke, some light can be directed to the concave mirror of the reflecting module, and after being converged by the concave mirror on the receiving module, the smoke concentration can be measured with high gain, and an alarm signal can be sent through the alarm device to timely remind the driver and passengers.

[0030] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0032] Figure 1 A schematic structural diagram of a smoke alarm device provided by an embodiment of the present utility model;

[0033] Figure 2 A schematic structural diagram of a reflecting module provided by an embodiment of the present utility model;

[0034] Figure 3 A schematic structural diagram of a transmitting module provided by an embodiment of the present utility model;

[0035] Figure 4 A schematic structural diagram of a receiving module provided by an embodiment of the present utility model;

[0036] Figure 5 Another schematic structural diagram of a smoke alarm device provided by an embodiment of the present utility model;

[0037] Figure 6 Another schematic structural diagram of a smoke alarm device provided by an embodiment of the present utility model;

[0038] Figure 7 Another structural schematic diagram of the smoke alarm device provided by the embodiment of the present utility model.

[0039] Icons: 100 - Smoke alarm device; 110 - Transmitting module; 120 - Reflecting module; 130 - Receiving module; 140 - Smoke bin module; 150 - Enclosing member; 111 - Transmitting diode; 112 - Anti-divergence unit; 113 - Partition board; 114 - First conical hole; 121 - Concave mirror; 122 - Mirror frame; 123 - Bracket; 124 - Hollow structure; 131 - Photoelectric triode; 132 - Second conical hole; 141 - Smoke hanging wall; 142 - Partition wall; 143 - Circular fence hole; 144 - Third conical hole; 151 - First branch; 152 - Second branch; 153 - Third branch. Specific implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model.

[0042] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present utility model, the terms "first", "second", etc. are only used for differential description and cannot be understood as indicating or implying relative importance.

[0043] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0044] As the new energy vehicle with the most rapid growth at present, its popularization faces many challenges. The key factors hindering potential customers from choosing new energy vehicles include short endurance, and a wait-and-see attitude towards reliability and safety. For the core components of the battery system, the battery management system is responsible for monitoring, controlling and protecting the battery system and individual batteries. The national standard GB 38031-2020 "Safety Requirements for Lithium-Ion Power Batteries for Electric Vehicles" stipulates that 5 minutes before a lithium-ion battery pack or system causes thermal diffusion due to thermal runaway of a single battery and then endangers the occupants, a pre-warning signal should be provided to remind the occupants to evacuate. Through early fire smoke detection and warning, the occurrence of an early fire can be advanced by 5-10 minutes, giving the driver and passengers enough time to evacuate and the vehicle controller enough time. Usually, the thermal runaway state of the battery is warned by detecting pressure, temperature or smoke concentration.

[0045] According to the publicly disclosed lithium battery thermal runaway smoke concentration detection scheme, it includes using a discrete smoke concentration detection device. When the battery management system is in a sleep state, the smoke concentration in the closed environment of the battery pack is detected by the smoke detection device at regular or irregular intervals. When the smoke concentration value is greater than the preset smoke safety threshold, the smoke detection device promptly sends a wake-up or warning signal to the battery management system or other vehicle controllers to wake up the battery management system or other vehicle controllers for battery thermal runaway warning operations, and as much as possible prevent the occurrence of vehicle fires caused by battery thermal runaway.

[0046] However, the current detection methods have insufficient accuracy and sensitivity, and are prone to detect smoke with a lag.

[0047] Based on the above situation, the embodiment of the present invention provides a smoke alarm device 100 and a battery system. The smoke alarm device 100 includes a transmitting module 110, a receiving module 130, a reflecting module 120 and an alarm module. The reflecting module 120 includes a concave mirror 121. The reflecting module 120 is located on one side of the first optical path of the first light beam emitted by the transmitting module 110. The receiving module 130 is located on the second optical path of the second light beam formed by the scattering of the first light beam reflected by the reflecting module 120. The alarm module is connected to the receiving module 130. When smoke enters the smoke alarm device 100, after the first light beam emitted by the transmitting module 110 is scattered by the smoke, some of the light rays can be directed to the concave mirror 121 of the reflecting module 120, and are converged on the receiving module 130 through the concave mirror 121, so that the smoke concentration can be measured with high gain and precision.

[0048] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the embodiments and features in the following embodiments can be combined with each other.

[0049] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the smoke alarm device 100 provided by the embodiment of the present invention. In the embodiment of the present invention, the smoke alarm device 100 includes a transmitting module 110, a receiving module 130, a reflecting module 120 and an alarm module. The reflecting module 120 includes a concave mirror 121. The reflecting module 120 is located on one side of the first optical path of the first light beam emitted by the transmitting module 110. The receiving module 130 is located on the second optical path of the second light beam formed by the scattering of the first light beam reflected by the reflecting module 120. The alarm module is connected to the receiving module 130. The smoke alarm device 100 uses the first light beam emitted by the transmitting module 110 to deviate from the concave mirror 121. When smoke enters the smoke alarm device 100, after the first light beam is scattered by the smoke, some of the light rays form a second light beam and are directed to the concave mirror 121, and are converged in the receiving module 130 through the concave mirror 121, achieving the effect of measuring the smoke concentration.

[0050] When the second light beam irradiates on the concave mirror 121, it is reflected by the concave mirror 121 and converges on the focal point in front of the mirror surface. The reflecting surface is concave and the focal point is in front of the mirror. When the light source is at the focal point, the light emitted is reflected to form a parallel light beam, mainly for the reflection of light rays, and is converged on the receiving module 130 through the concave mirror 121 to achieve the purpose of high gain.

[0051] When the battery undergoes thermal runaway and emits smoke, it will cause an abnormal current value in the receiving module 130. The alarm device combines voltage and temperature, for example, when the temperatures of two battery cells are greater than the set threshold and the dynamic voltage difference is too large, exceeding the set threshold, it conducts a thermal runaway alarm diagnosis, wakes up the battery system or other control components of the vehicle when detecting abnormal smoke, and reports the fault within the shortest time after the thermal runaway occurs.

[0052] In this embodiment, when the battery undergoes thermal runaway and emits a large amount of smoke, instead of further magnifying the smoke through a magnifying glass, the precise detection of the thermal runaway smoke is achieved through the optical reflection principle of the concave mirror 121.

[0053] In this embodiment, referring to Figure 2 , Figure 2 is a schematic structural diagram of the reflection module 120 provided by an embodiment of the present invention. The reflection module 120 further includes a mirror frame 122. The mirror frame 122 is used to install the concave mirror 121. The mirror frame 122 includes two brackets 123. Both ends of the concave mirror 121 are respectively connected to the two brackets 123, and the concave mirror 121 and the two brackets 123 form a hollow structure 124. Installing the concave mirror 121 through the mirror frame 122 can reduce the use of materials and save material costs.

[0054] Preferably, the included angle between the two brackets 123 is 90°, which can make the installation of the reflection module 120 more convenient and make the reflection module 120 more stable.

[0055] In order to reduce the scattering of the first light beam emitted by the transmitting module 110, a light-emitting diode with a small divergence angle and concentrated light can be selected. Referring to Figure 3 , Figure 3 is a schematic structural diagram of the transmitting module 110 provided by an embodiment of the present invention. The transmitting module 110 may include a transmitting diode 111 and an anti-divergence unit 112. The anti-divergence unit 112 includes at least one isolation plate 113. The isolation plate 113 is located on the first optical path and close to the emitting end of the transmitting diode 111. A first tapered hole 114 is opened on the isolation plate 113, and the large-mouth end of the first tapered hole 114 faces the transmitting diode 111.

[0056] In this embodiment, the transmitting diode 111 uses a light-emitting diode with a small divergence angle and concentrated light, which can reduce the scattering of the first light beam and reduce the light entering the reflection module 120 under normal circumstances. On the first optical path of the first light beam emitted by the transmitting diode 111, an isolation plate 113 is provided, which can further reduce the scattering of the first light beam. A first tapered hole 114 is opened on the isolation plate 113, and setting the large-mouth end of the first tapered hole 114 to face the transmitting diode 111 can reduce the scattering of the first light beam without reducing the intensity of the first light beam.

[0057] According to the design of this embodiment, the preferred solution for the first light beam emitted by the transmitting module 110 is to reduce the scattering of the first light beam. The receiving module 130 needs to receive more second light beams to make the detection of smoke more accurate. Therefore, referring to Figure 4 , Figure 4 FIG. is a schematic structural diagram of a receiving module 130 provided by an embodiment of the present invention. The receiving module 130 includes a phototransistor 131 and a light-shielding unit. The light-shielding unit includes a light-shielding plate. The light-shielding plate is located on the second light path and close to the receiving end of the phototransistor 131. A second tapered hole 132 is formed on the light-shielding plate, and the small end of the second tapered hole 132 faces the phototransistor 131. It can reduce the increase in the zero value of the phototransistor 131 caused by the diffuse reflection of the first light beam emitted by the emitting diode 111 in the maze.

[0058] Preferably, the width of the small end of the second tapered hole 132 is the same as the width of the phototransistor 131.

[0059] In order to make the smoke enter the smoke alarm device 100 more concentrated, the smoke alarm device 100 further includes a smoke bin module 140. Refer to Figure 5 , Figure 5 FIG. is another schematic structural diagram of the smoke alarm device 100 provided by an embodiment of the present invention. The smoke bin module 140 includes two smoke hanging walls 141 and at least one partition wall 142. The two smoke hanging walls 141 are arranged opposite to each other to form a smoke bin space. The partition wall 142 is sandwiched between the two smoke hanging walls 141, and the first light path passes through the smoke bin space. The smoke hanging wall 141 is provided with a through hole, and the through hole is a circular fence hole 143. The partition wall 142 is provided with a third tapered hole 144, and the small end of the third tapered hole 144 faces the concave mirror 121.

[0060] The smoke enters the smoke bin space through the through hole on the smoke hanging wall 141. The through hole is designed as a circular fence hole 143, which is convenient for the smoke to enter and is also conducive to collecting the smoke. Preferably, each small hole of the circular fence hole 143 is a tapered hole, and the small end of the tapered hole faces the other smoke hanging wall 141. It can make the smoke easier to enter the smoke bin space and not easy to flow out from the circular fence hole 143. Furthermore, the smoke concentration can be detected more effectively and accurately.

[0061] The partition wall 142 is used to partition the space in the vertical direction to ensure that the smoke can accumulate in the smoke bin space and be effectively detected. A third tapered hole 144 is provided on the partition wall 142, which can make the light scattered by the smoke more easily transmitted to the concave mirror 121, facilitating the collection of light.

[0062] The mirror surface direction of the concave mirror 121 can be set arbitrarily. To increase the detection accuracy, preferably, the central axis of the third conical hole 114 passes through the center of the mirror surface of the concave mirror 121. This setting method can enable the concave mirror 121 to reflect as many light rays scattered by the first light beam through the smoke as possible.

[0063] In order to reduce false alarms under normal circumstances when there is no smoke in the smoke alarm device 100, the smoke alarm device 100 further includes an enclosure member 150. Refer to Figure 6 , Figure 6 which is another structural schematic diagram of the smoke alarm device 100 provided by the embodiment of the present invention. The enclosure member 150 is located between the transmitting module 110 and the reflecting module 120. The enclosure member 150 includes a first branch 151, a second branch 152, and a third branch 153. The first branch 151 is connected to one side of the smoke bin module 140. The second branch 152 is located on the first branch 151 and forms a certain angle with the first branch 151. The third branch 153 is located on the second branch 152 and is parallel to the first branch 151.

[0064] The enclosure member 150 blocks and absorbs the first light beam emitted by the transmitting module 110, reducing the light entering the concave mirror 121 to lower the zero point.

[0065] A material with good absorption or reflection performance for the wavelength of the first light beam can be selected. In this way, when the first light beam irradiates on the enclosure member 150, most of the light rays will be absorbed or reflected, thereby reducing the amount of light entering the concave mirror 121. The material of the enclosure member 150 can be selected according to the situation of the transmitting module 110.

[0066] The enclosure member 150 is arranged between the transmitting module 110 and the reflecting module 120. The first branch 151 blocks the concave mirror 121 to prevent the first light beam from directly irradiating on the concave mirror 121.

[0067] In order to make the smoke alarm device 100 easy to install and use, the smoke alarm device 100 may further include a device housing, and the transmitting module 110, the receiving module 130, and the reflecting module 120 are all arranged in the device housing.

[0068] In order to further reduce the zero point of the first light beam, the angle between the first light beam and the second light beam can be set to be greater than or equal to 15° and less than or equal to 45°. In this embodiment, it can effectively avoid the first light beam from irradiating on the concave mirror 121.

[0069] In a possible embodiment, the smoke alarm device 100 includes all of the above contents. Refer to Figure 7 , Figure 7Another structural schematic diagram of the smoke alarm device 100 provided by the embodiment of the present invention. The smoke alarm device 100 can prevent the first light beam emitted by the emission module 110 from directly irradiating the concave mirror 121, reduce the zero point, make it easier for smoke to enter the smoke chamber module 140, and the light scattered by the smoke can accurately irradiate the concave mirror 121. The second light beam reflected by the concave mirror 121 can completely irradiate the receiving module 130.

[0070] In another embodiment, the battery system includes a battery module and the smoke alarm device 100. The battery module and the smoke alarm device 100 are arranged in the same space. Applied to new energy vehicles, when the battery has a thermal runaway, the smoke alarm device 100 sends the detected smoke alarm signal to the vehicle console to remind the driver and passengers to take corresponding measures.

[0071] In summary, the present invention provides an embodiment of a smoke alarm device and a battery system. The smoke alarm device includes an emission module, a receiving module, a reflection module, and an alarm module. The reflection module includes a concave mirror. The reflection module is located on one side of the first optical path of the first light beam emitted by the emission module. The receiving module is located on the second optical path of the second light beam formed by the scattered first light beam reflected by the reflection module. The alarm module is connected to the receiving module. The smoke alarm device further includes an enclosure member. The emission module includes an anti-divergence unit, and the receiving module includes a light-shielding unit. It can prevent the first light beam emitted by the emission module from directly irradiating the concave mirror, reduce the zero point, make it easier for smoke to enter the smoke chamber module, the light scattered by the smoke can accurately irradiate the concave mirror, and the second light beam reflected by the concave mirror can completely irradiate the receiving module. This smoke alarm device has the advantages of low zero point, high gain, high sensitivity, stable structure, and not easy to give false alarms.

[0072] In the embodiments provided by the present utility model, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of the present utility model. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0073] In addition, in each embodiment of the present utility model, the various functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0074] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0075] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A smoke alarm device, characterized in that: It includes a transmitting module, a receiving module, a reflecting module, a cigarette bin module, a device housing and an alarm module; the transmitting module, the receiving module and the reflecting module are all located in the device housing; The reflection module comprises a concave mirror; the concave surface of the concave mirror is a reflection surface, and the focus is in front of the mirror; The reflection module is located at one side of the first light path of the first light beam emitted by the emission module; The receiving module is located on the second optical path of the second light beam formed by the reflection module reflecting the first light beam and scattering it; the receiving module includes a phototransistor and a shading unit, the shading unit includes a shading plate, the shading plate is located on the second optical path and close to the receiving end of the phototransistor, a second conical hole is formed on the shading plate, and the small end of the second conical hole faces the phototransistor; The cigarette bin module comprises two cigarette hanging walls and at least one partition wall, the two cigarette hanging walls are arranged opposite to each other to form a cigarette bin space, and the partition wall is sandwiched between the two cigarette hanging walls; the first light path passes through the cigarette bin space; The smoke hanging wall is provided with a through hole, which is a circular fence hole; each small hole of the circular fence hole is a tapered hole, and the small end of the tapered hole faces the other smoke hanging wall; The partition wall is provided with a third tapered hole, and the small end of the third tapered hole faces the concave mirror; The central axis of the third conical hole passes through the center of the mirror surface of the concave mirror; the alarm module is connected to the receiving module.

2. The smoke alarm device according to claim 1, characterized in that: The reflection module also includes a mirror frame, which is used to install the concave mirror. The mirror frame includes two brackets, and the two ends of the concave mirror are respectively connected to the two brackets. The concave mirror and the two brackets form a hollow structure.

3. The smoke alarm device according to claim 1, characterized in that: The transmitting module includes a transmitting diode and an anti-divergence unit; The anti-divergence unit includes at least one isolation plate, and the isolation plate is located on the first optical path and close to the emission end of the emission diode; A first conical hole is formed on the isolation plate, and a large opening of the first conical hole faces the emitting diode.

4. The smoke alarm device according to claim 1, characterized in that: The smoke alarm device further comprises a protective component, wherein the protective component is located between the transmitting module and the reflecting module; The enclosure component includes a first branch, a second branch and a third branch; The second branch is located on the first branch and forms a certain angle with the first branch; The third branch is located on the second branch and is parallel to the first branch.

5. The smoke alarm device according to claim 1, characterized in that: An included angle between the first light beam and the second light beam is greater than or equal to 15° and less than or equal to 45°.

6. A battery system, characterized in that: The battery system comprises a battery module and a smoke alarm device according to any one of claims 1 to 5; The battery module and the smoke alarm device are arranged in the same space.

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