CN217767582U

CN217767582U - Split type labyrinth for smoke detector of battery pack

Info

Publication number: CN217767582U
Application number: CN202221745816.3U
Authority: CN
Inventors: 王�锋; 林照临; 梁继专; 王志鹄; 钟松琊
Original assignee: Fujian Haomagic Electronic Technology Co ltd
Current assignee: Fujian Shouzhong'an Intelligent Technology Co.,Ltd.
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2022-11-08
Anticipated expiration: 2032-07-08

Abstract

The invention provides a split type labyrinth for a battery pack smoke detector, which is characterized in that the labyrinth is designed into an upper part and a lower part which are separated, so that the smoke detector can meet the use requirements under a wide temperature range and strong vibration scene, and the split type labyrinth is characterized in that: the labyrinth comprises an upper half labyrinth and a lower half labyrinth, the upper half labyrinth and the lower half labyrinth are intersected and matched, a gap exists between the side walls of the upper half labyrinth and the lower half labyrinth, and the opening of the upper half labyrinth is positioned in the opening of the lower half labyrinth; the upper half part labyrinth is fixedly connected with the circuit board or the upper shell of the smoke detector, and the lower half part labyrinth is fixedly connected with the lower shell of the smoke detector.

Description

Split type labyrinth for smoke detector of battery pack

Technical Field

The utility model relates to a smoke detector technical field that is relevant, concretely relates to split type maze for battery package smoke detector.

Background

The popularization of the application of power lithium batteries and the frequent thermal runaway fire of the lithium batteries generate the monitoring requirement on the thermal runaway condition of the batteries. One of the main ways to monitor thermal runaway is to detect the volatilization of electrolyte, released gas and smoke particles generated during the initial stage of thermal runaway, and a photoelectric smoke detector can detect the conditions of the electrolyte volatilization particles and the smoke particles generated by combustion in the initial stage.

The lithium battery pack is particularly used for a new energy automobile, and the use scene of the lithium battery pack is special and mainly shows the following four aspects: firstly, the reliability and anti-vibration problems of the mechanism must be considered when the device is used in a vehicle-mounted scene; secondly, the volume space is limited; thirdly, in the using process of the battery pack, the temperature change amplitude caused by charging and discharging and natural environment change is large, and the temperature range of a typical vehicle-mounted device is minus 40 ℃ to plus 125 ℃; and fourthly, dust and condensation are attached to the surface of the maze to influence photoelectric smoke detection. Besides the application scenario of the battery pack, other special fields such as high-speed rails, airplanes, charging piles, energy storage devices and power equipment, particularly products used outdoors, have similar use requirements.

The traditional smoke detector used in the fire fighting scene is large in size, is statically and fixedly installed in an indoor place, and has a temperature range of-10 ℃ to +55 ℃, so that the smoke detector cannot meet the use requirements in a wide temperature range and a strong vibration scene. Therefore, there is a need for an optimized design of smoke detectors.

Disclosure of Invention

In order to solve the problems mentioned in the above, the invention provides a split type maze for a battery pack smoke detector, which designs the maze into an upper part and a lower part which are separated, so that the smoke detector can meet the use requirements in a wide temperature range and strong vibration scene.

The technical scheme is as follows:

a split type maze for battery pack smoke detector which is characterized in that: the labyrinth comprises an upper half labyrinth and a lower half labyrinth, the upper half labyrinth and the lower half labyrinth are crossed and matched, a gap exists between the side walls of the upper half labyrinth and the lower half labyrinth, and the opening of the upper half labyrinth is positioned in the opening of the lower half labyrinth; the upper half part labyrinth is fixedly connected with the circuit board or the upper shell of the smoke detector, and the lower half part labyrinth is fixedly connected with the lower shell of the smoke detector.

Further, the upper half labyrinth and the lower half labyrinth are intersected and matched in a staggered manner, and specifically the method comprises the following steps: suppose the height of the upper part of the maze is h _u The height of the lower half part of the labyrinth is h _d The total height of the labyrinth is h, h _u +h _d >h, and h _u +h _d The value of Δ h is less than or equal to h and 1 to 5mm.

Furthermore, there is the clearance between the lateral wall of the maze of the first half and the maze of the second half, specifically is: there is no connection between the side walls of the upper and lower labyrinths.

Further, the opening of the upper half labyrinth is positioned in the opening of the lower half labyrinth, and specifically comprises: the opening distance L of the upper part of the labyrinth _cd Is less than the opening distance L of the lower half part of the labyrinth _CD I.e. L _cd +∆L≤L _CD The value of Δ L is 1 to 3mm.

Further, the inclination angle of the side wall of the upper half labyrinth ranges from 70 ° to 100 °; the inclination angle of the side wall of the lower half labyrinth ranges from 70 degrees to 100 degrees.

Furthermore, the side walls of the upper half part labyrinth and the lower half part labyrinth are both air-permeable and light-tight structures.

Furthermore, the bottom center of the lower half labyrinth is of a structure with a high middle part and low periphery, and a draining hole is formed in the lower part of the bottom of the lower half labyrinth; the opening direction of the draining holes faces the side wall of the lower half labyrinth or the gap between the side walls of the upper half labyrinth and the lower half labyrinth.

Furthermore, the labyrinth of the upper half part also comprises a light barrier, and the light barrier is arranged between the emission pipe and the receiving pipe.

Furthermore, if the smoke detector adopts an integrated optical module with a baffle between a transmitting tube and a receiving tube and a light blocking shell, the labyrinth of the upper half part is not adopted, only the labyrinth of the lower half part is reserved, and the gap distance between the top end of the side wall of the labyrinth of the lower half part and the circuit board is 0.1 to 0.5mm.

Furthermore, the lower half labyrinth and the lower shell of the smoke detector are designed in an integrated mode.

Further, the lower casing is attached to the bottom of the lower labyrinth or the lower casing is attached to the side wall of the lower labyrinth.

The invention has the beneficial effects that:

according to the invention, the labyrinth is designed into the upper half labyrinth and the lower half labyrinth which are intersected and matched, a gap exists between the side walls of the upper half labyrinth and the lower half labyrinth, and the opening of the upper half labyrinth is positioned in the opening of the lower half labyrinth, so that friction and relative displacement cannot be generated between main mechanism parts of the labyrinth under the condition of strong vibration, the influence caused by expansion caused by heat and contraction caused by cold of main mechanism parts under the environment with wide temperature change is reduced, and the smoke detector can meet the use requirements under the conditions of wide temperature range and strong vibration. The integrated design is favorable for reducing the number of mechanism parts of the smoke detector, particularly a labyrinth, and reducing mechanism errors caused by installation looseness or displacement, and the mechanism errors, particularly the installation errors of the labyrinth mechanism, can directly cause optical signal errors of the labyrinth, so that all design optimization is the use requirement under the conditions of ensuring a wide temperature range and strong vibration.

Drawings

FIG. 1 is a schematic side cross-sectional view of the structure of the present invention;

FIG. 2 is a schematic structural view of two examples of the upper half labyrinth of the present invention;

FIG. 3 is a schematic diagram of the structure of two examples of the lower half of the maze of the present invention;

figure 4 is a schematic diagram of an example of a smoke detector.

Detailed Description

The present invention will be further described with reference to the following examples.

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple modifications of the method of the present invention based on the concept of the present invention are within the scope of the claimed invention.

As shown in fig. 1, an embodiment of a split labyrinth for a battery pack smoke detector is shown, the labyrinth comprising an upper half labyrinth 85 and a lower half labyrinth 84. The inner surface of the side wall of the upper labyrinth half 85, the inner surface of the side wall of the lower labyrinth half 84, the optical device side of the circuit board 4, and the inside of the BE section of the lower labyrinth half 84 constitute a smoke detection area 5, and smoke entering the smoke detection area 5 is detected.

The labyrinth 85 includes a buckle 851 and a side wall 853. The upper half labyrinth 85 is fixedly connected with the circuit board 4, namely is fixed on the circuit board 4 through a buckle 851 or a similar fixing mode, and the part has a simple structure and a light structure, and is beneficial to preventing the loosening and deformation in a vibration environment; alternatively, the labyrinth 85 of the upper part is fixedly connected to the upper housing 81 of the smoke detector, i.e. is fixed to the upper housing 81 of the smoke detector through the circuit board 4. The labyrinth 85 of the upper half part further comprises light barriers 852, and the two light barriers 852 are respectively arranged between the transmitting tube 1 and the

receiving tubes

21 and 22 and are used for preventing light rays emitted by the transmitting tube 1 from directly irradiating the

receiving tubes

21 and 22.

The transmitting tube 1, the receiving tube 21 and the receiving tube 22 default to use patch type optical devices, and the main optical axis of the optical devices is perpendicular to the circuitThe plate 4 is not suitable for being set too small in the half-power angle phi (typically, within the range of +/-35 to +/-65 degrees) in order to obtain enough optical detection space, and the luminous angle is limited by the fact that the height of the side wall 853 of the labyrinth in the upper half part is too high, so that the height h is not suitable for being too high _u The thickness is controlled within the range of 1 to 8mm, and is typically 5mm. The design is also beneficial to controlling the part weight of the upper half labyrinth, in particular to the scene that the upper half labyrinth 85 is fixed on the circuit board 4 in a locking way, and is beneficial to vibration occasions.

An example of the specific structure of the upper labyrinth 85 may be a rectangular structure as shown in fig. 2 (a) or a ring structure as shown in fig. 2 (b), wherein the reference numeral 856 is a position opening corresponding to the transmitting tube 1, the receiving tube 21 and the receiving tube 22, and the reference numeral h is _c The thickness of the base of the upper labyrinth 85. The rectangular configuration shown in FIG. 2 (a) is not closed for convenience of description, and the thickness h of the base of the labyrinth 85 in the upper half is _c It may itself provide some separation and if desired the rectangular configuration may be closed.

The lower half labyrinth 84 is fixedly connected with a lower shell 86 of the smoke detector, the lower half labyrinth 84 and the lower shell 86 of the smoke detector can be designed in an integrated mode, and the lower shell 86 is connected to the bottom of the lower half labyrinth 84 or the lower shell 86 is connected to the side wall of the lower half labyrinth 84. The AB section and the EF section of the lower shell 86 default to the BE section of the lower half labyrinth 84 on the same plane to achieve the simplest design, but also can enable the AB section and the EF section to move upwards on the premise of ensuring the airflow circulation, so that the lower shell 86 is positioned on the side wall of the lower half labyrinth 84, the cap of the lower half labyrinth 84 is exposed, smoke can freely enter the labyrinth from all directions, the azimuth consistency is better, and the movable distance does not exceed the height of the lower half labyrinth 84.

The bottom center 842 of the lower half labyrinth 84 is a structure with a high middle part and a low periphery, and a draining hole 841 is formed at the lower part of the bottom of the lower half labyrinth 84; thereby make things convenient for steam condensation or dust can be outside landing or discharge maze under the effect of gravity, if smoke detector is used for on-vehicle application, then can throw away the maze with the help of the effect of gravity and vibration with dust or condensation. The structure with high middle part and low periphery can be a rectangular pyramid, a watershed, an arc top or the like.

The opening direction of the drainage holes 841 is toward the side wall of the lower half labyrinth 84 or the gap between the upper half labyrinth 85 and the side wall of the lower half labyrinth 84, and in short, not toward the opening of the upper half labyrinth 85, thereby preventing external ambient light from being irradiated onto the receiving pipe through the drainage holes 841.

An example of the specific structure of the lower half labyrinth 84 may be a quadrangular pyramid reflecting surface structure shown in fig. 3 (a), or a conical reflecting surface structure shown in fig. 3 (b), and reference numeral 843 denotes a side wall of the lower half labyrinth 84.

Further, the inclination angles ° abc and °fed of the side wall of the upper half labyrinth 85 range from 70 ° to 100 °, and the typical value is 90 °, and since the launching tube 1 is located in the middle of the upper half labyrinth 85, the launching tube 1 is located in the conical body, so that the opening of the upper half labyrinth 85 is in a biased "eversion" design relative to the launching tube. The range of the inclination angles ≤ ABC and ≤ FED of the sidewall of the lower half labyrinth 84 is 70 ° to 100 °, the typical value is 90 °, and since the opening of the lower half labyrinth 84 is greater than the opening of the upper half labyrinth 85, the volume thereof is also greater than the upper half labyrinth 85, so as to provide more optical detection space. The side walls of the upper half maze 85 and the lower half maze 84 are both air-permeable and light-impermeable structures, such as a louver-shaped or zigzag-shaped convolution structure.

The upper half labyrinth 85 and the lower half labyrinth 84 are in crossed fit, and the height of the upper half labyrinth 85 is assumed to be h _u The height of the lower half labyrinth 84 is h _d The total height of the labyrinth is h, then h _u +h _d >h, and h _u +h _d The soil is less than or equal to h, and the value of h is 1 to 5mm; to ensure that laterally incident light does not enter the labyrinth directly.

There is a gap between the side walls of the upper half labyrinth 85 and the lower half labyrinth 84, i.e. there is no connection between the two side walls.

The opening CD of the upper labyrinth half 85 is located within the opening CD of the lower labyrinth half 84; what is needed isThe opening distance L of the upper half labyrinth 85 _cd Is less than the opening distance L of the lower half labyrinth 84 _CD I.e. L _cd +∆L≤L _CD L is 1 to 3mm; to ensure that the gap between the upper half labyrinth 85 and the lower half labyrinth 84 does not cause mechanical friction nor introduce ambient light interference due to excessive gaps.

The labyrinth split type design is as follows: the labyrinth is divided into two parts of an upper half part labyrinth 85 and a lower half part labyrinth 84, the two parts are in crossed and staggered fit, a gap exists between the side walls of the two parts, the opening of the upper half part labyrinth 85 is positioned in the opening of the lower half part labyrinth 84, and the following beneficial effects can be achieved: because the upper half labyrinth 85 and the lower half labyrinth 84 have intersecting parts, light cannot enter the inner part of the labyrinth from the side surface; because the upper half part labyrinth 85 is not connected with the lower half part labyrinth 84, the mechanism connection is avoided, the displacement and the friction caused by vibration and temperature change can be effectively reduced, and the reliability of the mechanism is improved; the split labyrinth design like "wrap the sky" facilitates installation and also helps to scatter light rays emitted in the upper part of the labyrinth as far as possible out of the labyrinth rather than reflecting back to the receiving tube.

The upper part labyrinth is necessary for the separate optics. However, if the smoke detector is an integrated optical module having a baffle between the transmitting tube and the receiving tube and a light blocking housing, such as an ADPD88BI module of ADI, only the labyrinth of the lower half is kept without using the labyrinth of the upper half, and the gap distance between the top end of the sidewall of the labyrinth of the lower half and the circuit board is 0.1 to 0.5mm, and the typical value is 0.25mm, because the height of the chip is generally greater than 1mm and the thickness of the chip is not more than 0.5mm, the smoke detector can not only prevent the side ambient light from irradiating the receiving tube, but also provide a certain mechanism margin and easily cope with the mechanism change under strong vibration and wide temperature range change, and prevent the mechanism components from mutually rubbing to cause deformation under the vibration condition to influence optical signals.

The other housing surfaces of the smoke detector besides the upper and lower housings, such as the left housing 82 and the right housing 83, can be optionally connected with the lower housing 86 or the upper housing 81 to form a single piece, and finally the housing parts of the whole smoke detector are not more than three: the lower casing integrated piece, the upper casing integrated piece and the upper half part labyrinth reduce the number of machine components and the assembly complexity. The entire smoke detector therefore consists of one circuit board 4 and two to three housing parts. The default mounting for the smoke detector is that the upper housing piece is positioned away from the center of the earth relative to the lower housing piece, so that no openings are required in the upper housing piece, particularly in the upper cover directly above, to prevent condensation or water droplets from entering.

The circuit board 4 is double-sided mounted, only sensor devices are mounted facing the labyrinth side, the sensor devices comprise optical devices for smoke detectors, temperature sensors for detecting ambient temperature, connectors 41 and a small number of small-size devices, and other parts are placed on the other side of the circuit board and fixed with the upper shell integrated piece. If the battery pack is used in an in-vehicle application, the in-vehicle connector is generally relatively large in size, and can be placed on the sensor side or the non-sensor side of the circuit board, and if the in-vehicle connector is placed on the sensor side, the connector cannot occupy more than 2/3 of the side area, so that the lateral gas circulation is ensured. The circuit board is provided with a through hole mounting hole which corresponds to the mounting holes of the upper shell integrated piece and the lower shell integrated piece, and the three are aligned and then fixed together by using screws.

The optical device of the smoke detector comprises an emitting tube LED and a receiving tube PD, the emitting tube 1 can be composed of one or more LEDs, and the receiving tube can also be composed of one or more PDs. In fig. 1, separate optics are used, and two receiver tubes are used, receiver tube 21 and receiver tube 22 being located on either side of emitter tube 1. If there is only one LED, the LED's light emitting center is aligned with the center of the maze, and if there are multiple LEDs, the LEDs are closely spaced with their geometric centers aligned with the center of the maze. Typically, if two LEDs are used, the line connecting the light emitting centers of the two LEDs is perpendicular to the line connecting the two PDs; if three LEDs are used, the finished product is distributed in a font shape; a checkered arrangement is used if 4 LEDs are used. Long wavelengths, such as the infrared band, are preferred if only one LED is used; if two LEDs are used, the second LED preferentially uses a short wavelength, such as the blue band; if multiple wavelength bands are used, a third LED preferentially uses a different wavelength in the spectrum, such as the red wavelength band. The optical angle of the transmitting tube 1 is α, which is generally set to be slightly larger than the half-power angle ± Φ of the transmitting tube 1, i.e., α >2 Φ. The optical angle of the receiving tube 21 is β, the optical angle of the receiving tube 22 is γ, and generally the optical angle of the receiving tube needs to be larger than that of the emitting tube to ensure enough photosensitive space, i.e. β > α and γ > α.

Fig. 4 shows an embodiment of a smoke detector to which the split labyrinth of the present invention is applied. The smoke detector is confined within a rectangular parallelepiped, assuming the appearance of the smoke detector as a rectangular parallelepiped having a length L, a width W, and a height H. One face of the cuboid is used for mounting, an ear-shaped mounting face extends along the mounting face in one or more directions, and at least two mounting holes 10 are formed in the mounting face and used for fixing the smoke detector. The other five surfaces of the cuboid of the smoke detector except the mounting surface are as follows: a left case 82, a right case 83, an upper case 81, a lower case 86, and a front case 87. The circuit board 4 is fixed in the inboard of epitheca 81, and its optical device is inside towards the maze, and its non-optical device is located the opposite side of circuit board 4, and is towards epitheca 81 promptly, and this kind of design is favorable to electronic components's water repellent, and optical device's orientation geocentric direction is favorable to throwing away condensation and dust under the condition of gravity and vibrations simultaneously. The connector 41 is attached to the circuit board 4, optionally above the circuit board 4 or below the circuit board 4, with the only requirement that the connector 41 does not occupy more than 2/3 of the area of the right housing to leave at least 1/3 of the space for conducting smoke and gases. The lower half labyrinth 84 may be formed integrally with the lower casing 86, and the left casing 82, the right casing 83, the front casing 87 and a part of the mounting surface may be formed integrally with the lower casing 84 or the upper casing 81, which greatly reduces the number of components and improves the anti-vibration performance of the labyrinth.

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 alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A split type maze for battery pack smoke detector which is characterized in that: the labyrinth comprises an upper half labyrinth and a lower half labyrinth, the upper half labyrinth and the lower half labyrinth are crossed and matched, a gap exists between the side walls of the upper half labyrinth and the lower half labyrinth, and the opening of the upper half labyrinth is positioned in the opening of the lower half labyrinth; the upper half part labyrinth is fixedly connected with the circuit board or the upper shell of the smoke detector, and the lower half part labyrinth is fixedly connected with the lower shell of the smoke detector.

2. The split labyrinth for a battery pack smoke detector of claim 1, wherein: the upper half labyrinth and the lower half labyrinth are intersected and matched in a staggered mode, and specifically the method comprises the following steps: suppose the height of the upper part of the maze is h _u The height of the lower half part of the labyrinth is h _d The total height of the labyrinth is h, h _u +h _d >h, and h _u +h _d The value of Δ h is less than or equal to h and 1 to 5mm.

3. The split labyrinth for a battery pack smoke detector as claimed in claim 1, wherein: there is the clearance between the lateral wall of first half maze and the latter half maze, specifically be: there is no connection between the side walls of the upper and lower labyrinths.

4. The split labyrinth for a battery pack smoke detector of claim 1, wherein: the opening of the upper half part labyrinth is positioned in the opening of the lower half part labyrinth, and specifically comprises the following steps: the opening distance L of the upper part of the labyrinth _cd Is less than the opening distance L of the lower half part of the labyrinth _CD I.e. L _cd +∆L≤L _CD The value of Δ L is 1 to 3mm.

5. The split labyrinth for a battery pack smoke detector of claim 1, wherein: the inclination angle of the side wall of the upper half labyrinth ranges from 70 degrees to 100 degrees; the inclination angle of the side wall of the lower half labyrinth ranges from 70 degrees to 100 degrees; the side walls of the upper half part labyrinth and the lower half part labyrinth are of air-permeable and light-tight structures.

6. The split labyrinth for a battery pack smoke detector as claimed in claim 1, wherein: the bottom center of the lower half labyrinth is of a structure with a high middle part and a low periphery, and a draining hole is formed in the lower part of the bottom of the lower half labyrinth; the opening direction of the draining holes faces the side wall of the lower half labyrinth or the gap between the side walls of the upper half labyrinth and the lower half labyrinth.

7. The split labyrinth for a battery pack smoke detector as claimed in claim 1, wherein: the labyrinth of the upper half part also comprises a light barrier, and the light barrier is arranged between the transmitting pipe and the receiving pipe.

8. The split labyrinth for a battery pack smoke detector of claim 1, wherein: if the smoke detector adopts an integrated optical module with a baffle between a transmitting tube and a receiving tube and a light blocking shell, the labyrinth of the upper half part is not adopted, only the labyrinth of the lower half part is reserved, and the gap distance between the top end of the side wall of the labyrinth of the lower half part and the circuit board is 0.1 to 0.5mm.

9. The split labyrinth for a battery pack smoke detector as claimed in claim 1, wherein: the lower half labyrinth and the lower shell of the smoke detector are designed in an integrated mode.

10. The split labyrinth for a battery pack smoke detector of claim 9, wherein: the inferior shell is connected to the bottom of the lower half labyrinth or the inferior shell is connected to the side wall of the lower half labyrinth.