Dust detection system

Abstract

To provide a system that can take out dust present in an internal space of a housing and detect the dust with high accuracy.SOLUTION: Application of ultrasonic vibration to a housing H isolates dust with high accuracy, which is attached to an inside surface of the housing H and / or a surface of a structure C. Since ions eliminate static electricity in an internal space S of the housing H, dust attached to the inside surface of the housing H and / or the surface of the structure C can be isolated with higher accuracy even if the dust is attached by charging. Consequently, the dust present in the internal space S of the housing H is surely sucked in by a suction device 14 from the internal space S of the housing H, and then surely detected by a dust detection device 24.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a system for detecting dust. [Background technology]

[0002] 2, a conventional secondary battery B includes a positive electrode plate C1 and a negative electrode plate C2 electrically insulated by a separator C4, a positive electrode current collector C12 electrically connected to the positive electrode plate C1, a negative electrode current collector C22 electrically connected to the negative electrode plate C2, and a generally hollow cylindrical housing H that accommodates and seals these components. The negative electrode terminal of the secondary battery B is formed by the bottom of the housing H, and the positive electrode terminal of the secondary battery B is formed by a lid member (not shown) that covers the top of the housing H. The open end of the housing H is joined to the lid member by crimping or the like around the entire periphery, thereby sealing the internal space S of the housing H (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-167557 Summary of the Invention [Problem to be solved by the invention]

[0004] If dust gets into the internal space S of the unsealed housing H during the manufacturing process of the secondary battery B, the dust may affect the performance of the finished secondary battery B. For this reason, it is necessary to inspect the internal space S of the housing H for the presence and amount of dust.

[0005] Therefore, an object of the present invention is to provide a system that can extract dust present in the internal space of a housing and detect the dust with high accuracy. [Means for solving the problem]

[0006] The dust detection system of the present invention comprises: a ventilation path having a ventilation pipe inserted into an interior space of the housing through an opening of the housing; an intake device that draws air from the interior space of the housing through the ventilation path; an ultrasonic vibration device that applies ultrasonic vibration to the housing; a dust detection device that optically detects dust contained in the air flowing through the ventilation path; It is equipped with:

[0007] According to the dust detection system of the present invention, by applying ultrasonic vibrations to the housing, dust adhering to the inner surface of the housing is released with high accuracy. As a result, dust present in the interior space of the housing is reliably sucked out of the interior space of the housing by the intake device. Therefore, dust present in the interior space of the housing can be more reliably detected. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a diagram illustrating the configuration of a dust detection system according to an embodiment of the present invention; [Figure 2] FIG. 2 is an explanatory diagram of an embodiment of a housing. DETAILED DESCRIPTION OF THE INVENTION

[0009] (composition) The dust detection system 1 according to one embodiment of the present invention shown in FIG. 1 is a system for extracting and detecting dust particles present in an internal space S of a housing H having an opening H0, particularly in a space defined by a structure C having a through-hole C0.

[0010] The outer shape of the housing H and / or the shape of the internal space S of the housing H may be various shapes such as a substantially cylindrical shape, a substantially prismatic shape, a substantially truncated cone shape, or a substantially truncated pyramid shape. The shape of the opening H0 of the housing H may be various shapes such as a circular shape, an elliptical shape, or a rectangular shape. Similarly, the outer shape of the structure C may be various shapes such as a substantially cylindrical shape, a substantially prismatic shape, a substantially truncated cone shape, or a substantially truncated pyramid shape. The shape (cross-sectional shape) of the through-hole C0 of the structure C may be various shapes such as a circular shape, an elliptical shape, or a rectangular shape. The housing H may be made of metal or synthetic resin.

[0011] 2, in one embodiment, the housing H is the housing H of the secondary battery B, and the structure C accommodated in the internal space of the housing H is composed of a positive electrode plate material C1, a negative electrode plate material C2, a separator C4 that electrically insulates the positive electrode plate material C1 and the negative electrode plate material C2, a positive electrode current collector C12 electrically connected to the positive electrode plate material C1, and a negative electrode current collector C22 electrically connected to the negative electrode plate material C2. The positive electrode plate material C1, the negative electrode plate material C2, and the separator C4 of the secondary battery B are spirally wound to form a substantially cylindrical structure C having a through-hole C0 in the approximate center.

[0012] As shown in FIG. 1, the dust detection system 1 includes a control device 10, an output interface 102, an ultrasonic vibration device 11, a static elimination device 12, an intake device 14, an air passage 22, and a dust detection device 24.

[0013] The control device 10 is configured with a microcomputer, an arithmetic processing device (CPU, microprocessor, processor core, etc.), and a storage device (memory, such as ROM and RAM). The control device 10 is configured to control the operations of the ultrasonic vibration device 11, the static eliminator 12, the intake device 14, and the dust detector 24.

[0014] The output interface 102 is configured as an image output device, and is configured to output the detection result from the dust detection device 24 .

[0015] The ultrasonic vibration device 11 has a piezoelectric element and a high-frequency power supply that supplies high-frequency current to the piezoelectric element, and applies ultrasonic vibrations (for example, vibration frequencies of 20 kHz to 40 kHz) to the housing H (see the black arrow in FIG. 1). The ultrasonic vibrations are, for example, ultrasonic vibrations in a direction parallel to the central axis or longitudinal direction of the housing H and / or in a direction perpendicular to the central axis of the housing H.

[0016] The static eliminator 12 has an ion supply pipe 120, an ion supply path 121, and an ion generator 122, and is configured to supply ions generated by the ion generator 122 to the external space via the ion supply path 121 and the ion supply pipe 120. The static eliminator 12 may be omitted.

[0017] The ventilation path 22 includes a ventilation pipe 220, a first ventilation path portion 221, a second ventilation path portion 222, a third ventilation path portion 223, and a dust collector 224. The dust collector 224 is connected to each of the second ventilation path portion 222 and the third ventilation path portion 223. A filter 2242 is provided in the internal space of the dust collector 224. The second ventilation path portion 222 passes through the filter 2242 and communicates with the dust collection space. The third ventilation path portion 223 communicates with a space on the opposite side of the filter 2242 from the dust collection space. The dust collector 224 may be omitted.

[0018] The ventilation pipe 220 is configured to be inserted through the opening H0 of the housing H, and the tip opening portion thereof is inserted into the internal space S of the housing H. The ventilation pipe 220 is configured so that, when inserted through the through-hole C0 of the structure C present in the internal space S of the housing H, the tip opening portion of the ventilation pipe 220 is inserted into a space of the internal space S of the housing H that is partially defined by the structure C.

[0019] The ion supply pipe 120 and the vent pipe 220 form a double pipe that is inserted into the internal space S through the opening H0 of the housing H, and the ion supply pipe 120 (inner pipe) is provided concentrically or eccentrically inside the vent pipe 220 (outer pipe). The double pipe or its outer pipe is formed to be slightly thinner than the opening H0 of the housing H and / or the through-hole C0 of the structure C. Each of the ion supply pipe 120 and the vent pipe 220 may be a pipe having various cross-sectional shapes, such as a substantially cylindrical pipe, a substantially square pipe, or a substantially regular n-sided pipe (n = 6, 8, 12, etc.). Each of the ion supply pipe 120 and the vent pipe 220 may be made of, for example, metal or synthetic resin, and may be elastically deformable.

[0020] The intake device 14 is configured by a vacuum pump or the like, and sucks air from the internal space S of the housing H through the ventilation path 22 and discharges the air to the external space through the ventilation path 22 (see the white arrow in FIG. 1). The intake device 14 is provided midway along the third ventilation path portion 223, but may be provided at any position along the ventilation path 22.

[0021] The dust detection device 24 optically detects dust contained in the air flowing through the ventilation path 22. The dust detection device 24 includes a laser projector 241, a scattered light sensor 242, and a chamber 244.

[0022] The laser projector 241 has a light source such as an LED and an optical system such as a lens, and is configured to irradiate the interior space of the chamber 244 with laser light. The wavelength of the laser light is, for example, 0.635 μm (red laser light) or 0.532 μm (green laser light). The scattered light sensor 242 is configured to detect the intensity of the laser light scattered by dust particles in the interior space of the chamber 244 through an optical system (for example, composed of a condenser lens, an ND filter, and a bandpass filter), thereby detecting the number or density of the dust particles. The chamber 244 is made of a material that is translucent to the laser light, at least at the location where the laser light is irradiated by the laser projector 241 and the location where the laser light is detected by the scattered light sensor 242.

[0023] The chamber 244 is provided between the first air passage portion 221 and the second air passage portion 222. The cross-sectional area of ​​the chamber 244 (the area of ​​a cross section perpendicular to the central axis) is larger than the cross-sectional area of ​​the air passage 22 (the first air passage portion 221 and the second air passage portion 222) on the upstream and downstream sides thereof. The chamber 244 has a shape in which a substantially conical cylinder (or a substantially truncated conical cylinder) having a lower bottom surface of substantially the same diameter as the cylinder is connected to both ends of the substantially cylindrical body. That is, the cross-sectional area of ​​the chamber 244 is configured to increase continuously or intermittently from the upstream end to the downstream end, and then decrease continuously or intermittently. A guide structure for changing the airflow introduced into the chamber 244 into a spiral airflow may be provided inside the chamber 244.

[0024] The outer shape of the chamber 244 or the shape of its internal space may be various shapes, such as an approximately spherical shape, an approximately ellipsoidal shape, an approximately cylindrical shape, an approximately prism shape, an approximately truncated cone shape, or an approximately truncated pyramid shape, or a combination thereof (for example, a pair of truncated cones or truncated pyramid shapes that are continuous at the lower or upper base surface).

[0025] (Dust detection method) The procedure for the dust detection method using the dust detection system 1 configured as described above will be described. First, as shown in FIGS. 1 and 2 , a double pipe formed by the ion supply pipe 120 and the ventilation pipe 220 is inserted into the opening H0 of the housing H and the through-hole C0 of the structure C, and the tip of the double pipe is guided into a space within the internal space S of the housing H that is partially defined by the structure C. In this state, ultrasonic vibration is applied to the housing H by the ultrasonic vibration device 11. Furthermore, ions generated by the ion generator 122 of the static eliminator 12 are introduced from the tip of the ion supply pipe 120 into the internal space S of the housing H, thereby eliminating static electricity from the internal space S of the housing H. Then, the air suction device 14 is operated, and air within the internal space S of the housing H is sucked into the ventilation path 22 from the tip of the ventilation pipe 220. Prior to the start of operation of the air suction device 14, the operation of the ultrasonic vibration device 11 and / or the static eliminator 12 may be stopped.

[0026] When air flows through the internal space of chamber 244, laser projector 241 irradiates the internal space of chamber 244 with laser light, and the intensity of the laser light scattered by dust particles contained in the air is detected by scattered light sensor 242. The scattered light sensor 242 transmits the detection result (the cumulative number or density of detected dust particles, or the number or density of detected dust particles per unit time) to control device 10. Furthermore, the detection result is transmitted from control device 10 to output interface 102 and then output or displayed.

[0027] Dust is taken into a dust collection space defined by the filter 2242 in the internal space of the dust collector 224. The dust taken into the dust collection space is prevented by the filter 2242 from flowing into the third ventilation path portion 223.

[0028] (effect) According to the dust detection system configured as described above, ultrasonic vibrations are applied to the housing H, so that dust adhering to the inner surface of the housing H and / or the surface of the structure C is released with high accuracy. Furthermore, because the internal space S of the housing H is neutralized by ions, even dust that has been charged and adhered to the inner surface of the housing H and / or the surface of the structure C can be released with even higher accuracy. Therefore, dust present in the internal space S of the housing H can be reliably sucked from the internal space S of the housing H by the intake device 14, and then reliably detected by the dust detection device 24.

[0029] (Another embodiment of the present invention) In the above embodiment, the internal space S of the housing H is neutralized by the neutralization device 12, but in other embodiments, ions generated by the ion generator 122 of the neutralization device 12 may be supplied to the external space of the housing H, thereby neutralizing the outside of the housing H.

[0030] In the above embodiment, the ion supply pipe 120 and the vent pipe 220 form a double pipe inserted into the internal space S through the opening H0 of the housing H, and the ion supply pipe 120 (inner pipe) is provided concentrically or eccentrically inside the vent pipe 220 (outer pipe). In another embodiment, the ion supply pipe 120 and the vent pipe 220 may form a double pipe inserted into the internal space S through the opening H0 of the housing H, and the vent pipe 220 (inner pipe) may be provided concentrically or eccentrically inside the ion supply pipe 120 (outer pipe). In still another embodiment, the ion supply pipe 120 and the vent pipe 220 may form two separate pipes inserted into the internal space S through a common or separate opening H0 of the housing H.

[0031] The chamber 244 in the above embodiment may be omitted, and the dust detecting device 24 may detect dust flowing through the ventilation path 22. In this case, the ventilation path 22 may be made of a material that is translucent to the laser light at least at the location where the laser light is irradiated by the laser projector 241 and the location where the laser light is detected by the scattered light sensor 242.

[0032] In the above embodiment, the structural body C is accommodated in the internal space S of the housing H. However, in other embodiments, the structural body C may not be present in the internal space S of the housing H. [Explanation of symbols]

[0033] 1. Dust detection system 10. Control device 11. Ultrasonic vibration device 12‥Static eliminator 120 Ion supply tube 121...Ion supply path 122 Ion generator 14. Intake system (pump) 22. Ventilation path 220...Ventilation pipe 221...First ventilation path part 222...Second ventilation path part 223...Third ventilation path part 224 Dust collector 2242...Filter 24. Dust detection device 241...Laser projector 242... Scattered light sensor 244...Chamber B‥Secondary battery C‥Structure C0...Through hole (of structure) H...Housing H0...Opening (of the housing).

Claims

1. a ventilation path having a ventilation pipe inserted into an interior space of the housing through an opening of the housing; an intake device that draws air from the interior space of the housing through the ventilation path; an ultrasonic vibration device that applies ultrasonic vibration to the housing; a dust detection device that optically detects dust contained in the air flowing through the ventilation path; Equipped with Dust detection system.

2. 2. The dust detection system according to claim 1, The static eliminator includes an ion generator and an ion supply pipe, and supplies ions generated by the ion generator to the interior space of the housing through the ion supply pipe to eliminate static electricity from the interior space of the housing. Dust detection system.

3. 3. The dust detection system according to claim 2, The ventilation pipe and the ion supply pipe form a double pipe. Dust detection system.

4. 2. The dust detection system according to claim 1, The device has an ion generator and is equipped with a static eliminator that supplies ions generated by the ion generator to the outside of the housing to eliminate static electricity from the outside of the housing. Dust detection system.

5. The dust detection system according to any one of claims 1 to 4, the ventilation path includes a chamber disposed between the ventilation pipe and the intake device, the chamber having a cross-sectional area larger than a cross-sectional area of ​​the ventilation path on each of the upstream and downstream sides of the chamber; The dust detection device is configured to optically detect dust contained in air flowing through the internal space of the chamber. Dust detection system.

6. 6. The dust detection system according to claim 5, The cross-sectional area of ​​the chamber is configured to increase continuously or intermittently from the upstream end to the downstream end, and then decrease continuously or intermittently. Dust detection system.

7. 2. The dust detection system according to claim 1, The ventilation pipe is configured so that, when inserted into a through-hole of a structure present inside the housing, a tip of the ventilation pipe is present in a portion of the internal space of the housing that is partially defined by the structure. Dust detection system.

8. 4. The dust detection system according to claim 2 or 3, The ion supply tube is configured so that, when inserted into a through-hole of a structure present inside the housing, a tip of the ion supply tube reaches a portion of the internal space of the housing that is partially defined by the structure. Dust detection system.

9. 2. The dust detection system according to claim 1, An output interface is provided to output the detection results of the dust detection device. Dust detection system.

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