JP7177474B2 - inspection equipment - Google Patents

Description

The present invention relates to an inspection device.

As a method for inspecting the surface of a battery for foreign matter, coating agent, etc. in the manufacturing process of the battery, for example, the following Patent Document 1 discloses that the surface of the battery is irradiated with ultraviolet rays in a dark room in a housing to detect the foreign matter and the coating agent on the surface of the battery. A method of inspecting a coating agent or the like by emitting light is disclosed.

JP 2018-77184 A

By the way, in order to cope with the mass production of batteries, it is preferable to inspect the surfaces of the batteries while the batteries are mounted on a pallet that conveys the batteries along a production line such as a belt conveyor. However, when a pallet (stand) is arranged in a housing and irradiated with ultraviolet rays as in Patent Document 1, there is a possibility that the pallet will be exposed to ultraviolet rays and deteriorate.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an inspection apparatus capable of accurately inspecting the surface of a battery while suppressing deterioration of the pallet.

An inspection apparatus according to the present invention for achieving the above object comprises a pallet on which a battery is placed, a housing having an opening at the bottom and forming a darkroom around the battery, and a surface of the battery in the darkroom. and an imaging unit that captures an image of the surface of the battery irradiated with ultraviolet rays and forms image data. The bottom portion of the housing has an overlapping portion overlapping the outer peripheral portion of the battery at the edge portion of the opening when viewed from the irradiation direction of the ultraviolet rays of the irradiation portion.

According to the inspection apparatus of the present invention, it is possible to accurately inspect the surface of the battery while suppressing deterioration of the pallet due to irradiation of ultraviolet rays.

It is a perspective view which shows a battery module. FIG. 2 is a partially exploded perspective view of the battery module shown in FIG. 1; Fig. 3 is a perspective view showing one battery of the battery stack shown in Fig. 2; FIG. 3 is a cross-sectional view showing part of the battery stack shown in FIG. 2; It is a side view which shows a part of inspection apparatus which concerns on this embodiment in a cross section. 5B is an enlarged view of a portion A surrounded by a two-dot dashed line in FIG. 5A. FIG. 5B is a top view showing a cross section of a portion of the inspection apparatus shown in FIG. 5A; FIG. It is a figure for demonstrating the procedure which test|inspects the application|coating state of a frame material by the test|inspection apparatus which concerns on this embodiment. It is a figure for demonstrating the procedure which test|inspects the application|coating state of a frame material by the test|inspection apparatus which concerns on this embodiment. It is a figure for demonstrating the procedure which test|inspects the application|coating state of a frame material by the test|inspection apparatus which concerns on this embodiment. It is a figure for demonstrating the procedure which test|inspects the application|coating state of a frame material by the test|inspection apparatus which concerns on this embodiment. It is a figure for demonstrating the procedure which test|inspects the application|coating state of a frame material by the test|inspection apparatus which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the drawings, the same members are denoted by the same reference numerals, and overlapping descriptions are omitted. In the drawings, the size and ratio of each member are exaggerated for easy understanding of the embodiments, and may differ from the actual size and ratio.

An inspection apparatus 10 according to one embodiment of the present invention is an apparatus for inspecting the surface of a battery 110 . A battery 110 to be inspected by the inspection apparatus according to this embodiment constitutes a part of the battery module 100 . Hereinafter, after describing the battery module 100 to be inspected in this embodiment, the inspection apparatus according to this embodiment will be described.

[Battery module 100]
FIG. 1 is a perspective view showing a battery module 100. FIG. FIG. 2 is a partially exploded perspective view of the battery module 100 shown in FIG. 1 and 2, battery module 100 includes a module case 120 in which a battery stack 110s formed by stacking a plurality of flat batteries 110 is housed. The module case 120 is composed of four plate members and also functions as a pressurizing unit that pressurizes the battery stack 110s. A plurality of batteries 110 are electrically connected by busbar unit 130 while being pressurized by module case 120 .

Note that the XYZ axes in the drawing indicate the orientation of the battery module 100. FIG. The X-axis crosses the stacking direction of the batteries 110 and indicates the direction along the longitudinal direction of the batteries 110 . The Y-axis indicates a direction that intersects the stacking direction of the batteries 110 and is along the lateral direction of the batteries 110 . The Z-axis indicates the stacking direction of the batteries 110 .

FIG. 3 is a perspective view showing one battery of the battery stack 110s shown in FIG. The battery 110 has a substantially rectangular shape with four sides when viewed from the stacking direction (the Z direction in FIG. 3) of the battery 110 in the battery stack 110s. An electrode tab 113 is connected to one of the four sides. Battery 110 is, for example, a flat lithium-ion secondary battery.

FIG. 4 is a cross-sectional view showing part of the battery stack 110s shown in FIG. Referring to FIG. 4, in battery 110, a power generation element 111 formed by stacking electrode plates is housed inside an exterior body 112 together with an electrolytic solution. Of the surfaces of battery 110, the upper surface and the lower surface correspond to main surface 140, which is the surface of battery 110 in the battery thickness direction. The battery stack 110s is formed by stacking the batteries 110 such that the main surfaces 140 of the batteries 110 face each other.

Referring to FIGS. 3 and 4, electrode tab 113 is electrically connected to power generation element 111 and led out from exterior body 112 . The electrode tab 113 has an anode side electrode tab 113A and a cathode side electrode tab 113K. Aluminum, for example, can be used as a material for forming the anode-side electrode tab 113A. Copper, for example, can be used as a material for forming the cathode-side electrode tab 113K.

Referring to FIGS. 3 and 4, on main surface 140 of battery 110, a resin is applied in a frame shape that protrudes from main surface 140 of battery 110 in the battery thickness direction (Z direction) and is open in the battery thickness direction. A frame member 150 (coating agent) formed by coating is formed. Referring to FIG. 4, frame member inner space 150R formed by frame member 150, main surface 140 of one battery 110, and main surface 140 of another battery 110 facing one battery 110 in the stacking direction includes: , are filled with filler 160 .

The frame member 150 has a substantially rectangular shape with four sides when viewed from the direction of the main surface 140 . Note that the shape of the frame member 150 is not limited to a substantially rectangular shape, and can be changed as appropriate. The frame member 150 has elasticity to such an extent that it is compressed and deformed in the battery thickness direction when the battery stack 110s is pressed from both sides in the stacking direction. The frame member 150 functions like a dam or weir that limits the extent to which the filler 160 spreads. Therefore, the material forming the frame member 150 can be made of a material that is elastic and can block the filler 160 without allowing it to pass through.

The frame member 150 is made of a material including a light-emitting substance that emits light when irradiated with ultraviolet rays, and for example, an ultraviolet-curable acrylic resin is used. The frame member 150 can be formed by applying a liquid resin to the main surface 140 of the battery 110 in a frame shape, and then curing the liquid resin into a gel by irradiating ultraviolet rays. Since the frame material 150 is gel-like even after curing, it has elasticity and can block passage of the filler 160 . The frame member 150 is transparent or translucent. The frame member 150 may or may not have an adhesive function.

Referring to FIG. 4, frame member inner space 150R is formed by frame member 150, main surface 140 of one battery 110, and main surface 140 of another battery 110 facing one battery 110 in the stacking direction. . The frame member inner space 150R is a closed space.

The filler 160 that fills the frame member inner space 150R is a plastic fluid (Bingham fluid). A Bingham fluid is a fluid that does not begin to flow until a certain shear stress is reached. Therefore, it is possible to easily generate surface pressure against main surface 140 of battery 110 by pressurization. For the filler 160, for example, a two-liquid reactive acrylic anaerobic resin can be used. The filler 160 may or may not have an adhesive function. Also, the filler 160 may be a Newtonian fluid, or may be either a two-liquid mixed type or a one-liquid type.

Referring to FIG. 3, battery 110 is supported by a pair of first spacers 114 on the side with electrode tabs 113 and by a pair of second spacers 115 on the side without electrode tabs 113 . Batteries 110 are stacked while being supported by spacers 114 and 115 . Each spacer 114, 115 is formed, for example, from reinforced plastics with insulating properties.

Referring to FIGS. 1 and 2, module case 120 presses upper and lower pressurizing plates 121 and 122 that apply pressure to power generation elements 111 of each battery 110 of battery stack 110s, and pressurizes battery stack 110s. It includes a pair of side plates 123 that secure an upper pressure plate 121 and a lower pressure plate 122 in place. Upper pressure plate 121 is formed with locate holes 121b into which fastening bolts for fixing battery module 100 to a pack case (not shown) are inserted. The lower pressure plate 122 is similarly formed with a locate hole 122b into which a fastening bolt is inserted. A pair of side plates 123 are welded to the upper pressure plate 121 and the lower pressure plate 122 . Although the material for forming the module case 120 is not particularly limited, it can be made of, for example, stainless steel.

The busbar unit 130 includes a busbar 132 that electrically connects the electrode tabs 113 of the batteries 110 arranged vertically, a busbar holder 131 that integrally holds a plurality of busbars 132 , and a protective cover 135 that protects the busbar 132 . have. The busbar unit 130 further includes an anode terminal 133 that exposes the anode-side ends of the electrically connected plurality of batteries 110 to external input/output terminals, and a cathode terminal 133 that exposes the cathode-side terminals to the external input/output terminals. and a side terminal 134 .

[Inspection device 10]
An inspection apparatus 10 according to the present embodiment will be described with reference to FIGS. 5A, 5B and 6. FIG. FIG. 5A is a side view showing a part of the inspection device 10 in cross section. FIG. 5B is an enlarged view of a portion A surrounded by a two-dot dashed line in FIG. 5A. FIG. 6 is a top view showing a cross section of a portion of the inspection apparatus 10 shown in FIG. 5A.

The inspection apparatus 10 according to this embodiment is an apparatus for inspecting the application state of the frame material 150 applied to the surface of the flat battery 110 . Note that this inspection is performed before the space 150</b>R inside the frame member 150 is filled with the filler 160 . Since the frame member 150 is transparent or translucent, it is difficult to accurately detect the frame member 150 from image data captured by a camera or the like. Therefore, the inspection apparatus 10 according to the present embodiment accurately inspects the shape of the frame member 150 by irradiating the frame member 150 with ultraviolet rays UV (ultraviolet rays are indicated by the symbol “UV” in the drawing) to cause the frame member 150 to emit light. be able to.

Referring to FIG. 5A, inspection apparatus 10 includes pallet 20 having frame member 150 on which battery 110 is placed, driving unit 30 for moving or positioning pallet 20, and housing forming dark room 40R around battery 110. Imaging for forming image data by imaging the body 40, the irradiation unit 50 for irradiating the surface of the battery 110 and the frame material 150 in the darkroom 40R with the ultraviolet UV, and the surface of the battery 110 and the frame material 150 irradiated with the ultraviolet UV. a portion 60; The inspection apparatus 10 further includes a control section 70 that controls operations of the drive section 30 , the irradiation section 50 and the imaging section 60 , and a display section 80 that displays the image captured by the imaging section 60 . The configuration of each unit will be described in detail below.

(Palette 20)
Referring to FIG. 5A, pallet 20 has a top surface 20S on which a plurality of batteries 110 can be placed. In this embodiment, two batteries 110 are placed on the upper surface 20S of the pallet 20. As shown in FIG. Thereby, the irradiation unit 50 can simultaneously irradiate a plurality of (two) batteries 110 with ultraviolet rays UV. Therefore, the cycle time required for manufacturing each battery 110 can be shortened, and productivity is improved. The constituent material of the pallet 20 is a material containing resin. Since the pallet 20 is made of resin, its weight can be reduced. On the other hand, the resin pallet 20 is easily deteriorated by irradiation with ultraviolet rays UV.

(Driving unit 30)
5A and 6, drive unit 30 has two conveyors 31, stopper 32 and pallet locate 33 (corresponding to moving unit).

Referring to FIG. 6, the conveyor 31 can be a known belt conveyor that moves the pallet 20 on a ring-shaped belt that rotates by a conveying device such as a roller conveyor. The two conveyors 31 are arranged in parallel and spaced apart from each other in a direction intersecting the conveying direction X. As shown in FIG. A stopper 32 and a pallet locate 33 are arranged between the two conveyors 31 . The conveyor 31 is not limited to a belt conveyor as long as the pallet 20 can be conveyed in the conveying direction X. For example, a linear conveyor that moves a slider, which is a carriage, along a rail in the conveying direction X may be used. good too.

The stopper 32 has a function of stopping and positioning the pallet 20 at a position above the pallet locate 33 in the middle of the conveying path of the conveyor 31 that conveys the pallet 20 . The stopper 32 is configured to be vertically movable, and is arranged downstream of the pallet locate 33 in the conveying direction X (arrow direction in FIG. 6) of the conveyor 31 . The stopper 32 is vertically driven by a drive source (not shown) such as a cylinder whose operation is controlled by the controller 70 . The stopper 32 moves above the conveyor 31 and is positioned in the middle of the conveying path of the pallet 20 , thereby coming into contact with the end of the pallet 20 conveyed by the conveyor 31 and stopping the pallet 20 . The stopper 32 moves below the conveying path on the upper surface of the conveyor 31 (see the dashed line in FIG. 5A) to allow the pallet 20 to be conveyed downstream in the conveying direction X from the stopper 32 .

The pallet locate 33 moves the pallet 20 toward or away from the housing 40 . Specifically, the pallet locate 33 moves vertically while placing the pallet 20 on its upper surface and keeping the pallet 20 horizontal. The pallet locate 33 is vertically driven by a drive source (not shown) such as a cylinder whose operation is controlled by the controller 70 .

(Case 40)
Referring to FIG. 5A, housing 40 is formed in the shape of a hollow box and includes bottom 41 having opening 40H. In a state in which the pallet 20 is moved upward by the pallet locate 33 and the batteries 110 placed on the pallet 20 are arranged so as to face the opening 40H, the housing 40 forms a dark room 40R around the batteries 110. to form

The housing 40 has a plurality of openings 40H corresponding to each of the plurality (two in this embodiment) of the batteries 110 placed on the pallet 20 . The housing 40 also forms a separately partitioned darkroom 40R around each battery 110 . By forming a plurality of darkrooms 40R corresponding to the plurality of batteries 110 in this way, when the irradiation unit 50 irradiates ultraviolet rays UV in the darkroom 40R, the ultraviolet rays UV emitted to one battery 110 can be can be prevented from leaking and irradiating other batteries 110 and frame member 150 . Thereby, deterioration of the battery 110 due to excessive irradiation of the battery 110 and the frame member 150 with ultraviolet rays UV can be prevented.

5A and 5B, bottom portion 41 of housing 40 has overlapping portion 42 overlapping the outer peripheral portion of battery 110 at the edge of opening 40H when viewed from irradiation direction Z of ultraviolet UV of irradiation portion 50. have. Here, the irradiation direction of the ultraviolet rays UV of the irradiation unit 50 means the direction along the optical axis L1 of the ultraviolet rays UV (the Z direction in this embodiment). The overlapping portion 42 has a function of shielding the outer peripheral portion of the battery 110 and the pallet 20 from ultraviolet rays UV. A length W1 of overlapping portion 42 and the outer peripheral portion of battery 110 is shorter than a length W2 between the outer peripheral edge of frame member 150 and the outer peripheral edge of battery 110 . As a result, the frame member 150 is arranged inside the overlapping portion 42 of the housing 40 , so that the entire frame member 150 can be irradiated with the ultraviolet rays UV.

The bottom portion 41 of the housing 40 further has a vertical wall portion 43 extending from the overlapping portion 42 in the irradiation direction Z of the ultraviolet rays UV of the irradiation portion 50 . The vertical wall portion 43 is arranged so as to surround the outer periphery of the battery 110 when viewed from the irradiation direction Z of the ultraviolet rays UV of the irradiation portion 50 .

The height H1 of the vertical wall portion 43 of the housing 40 is formed to be greater than the height H2 of the battery 110 . Thus, when the vertical wall portion 43 is in contact with the upper surface 20S of the pallet 20, the overlapping portion 42 does not come into contact with the battery 110, and the overlapping portion 42 can reliably shield the pallet 20 from ultraviolet rays UV. Since the overlapping portion 42 of the housing 40 does not contact the battery 110, deformation of the battery 110 due to the contact of the housing 40 can be prevented.

(Irradiation unit 50)
Referring to FIG. 5A, irradiation unit 50 is provided in the upper part of the internal space of housing 40 and irradiates frame member 150 with ultraviolet rays UV from a light source. As a result, the light-emitting substance of the frame member 150 reacts and emits blue light, for example. The irradiation unit 50 irradiates the ultraviolet rays UV such that the optical axis L<b>1 of the ultraviolet rays UV is located outside the battery 110 . By preventing the optical axis L1 of the ultraviolet UV from striking the battery 110 and the frame member 150, the amount of ultraviolet light irradiated to the battery 110 and the frame member 150 is suppressed, thereby preventing deterioration due to the irradiation of the ultraviolet UV. can be done. Battery 110 and frame member 150 are irradiated with ultraviolet rays UV diffused from optical axis L1. The optical axis L1 is the central axis of the ultraviolet rays UV emitted from the irradiation unit 50 and diffused. The light source of the irradiation unit 50 is not particularly limited, and for example, a fluorescent type, an LED type, or the like can be used.

(Imaging unit 60)
The imaging unit 60 is provided substantially at the center of the main surface 140 of the battery 110 in the internal space of the housing 40 and above the irradiation unit 50 . The imaging unit 60 is arranged so as to be shifted from the irradiating unit 50 so that the entire frame member 150 can be imaged. The imaging unit 60 can use, for example, a combination of a solid-state imaging device such as a CCD or C-MOS and a lens group optical system.

(control unit 70)
The control unit 70 mainly includes a CPU and a memory, and controls operations of the driving unit 30, the irradiation unit 50, the imaging unit 60, and the like.

Further, the control section 70 has an image processing function for image processing the image data received from the imaging section 60 . The control unit 70 stores an image processing program necessary for image processing and processing of image data. The control unit 70 compares the result of the image processing with the pre-stored normal shape of the frame member 150, and if there is a shape difference greater than or equal to the prescribed shape between the shape of the captured image and the normal shape, the frame member 150 is determined. It is determined that the coating state is bad, and if it is within the specified range, it is determined that the coating state of the frame material 150 is good.

(Display unit 80)
The display unit 80 is composed of a liquid crystal display, an organic EL display, or the like, and displays the image data captured by the imaging unit 60 and the result of the coating state of the frame material 150 determined by the control unit 70 .

[Inspection method by inspection device 10]
7A to 7E are diagrams for explaining the procedure for inspecting the application state of the frame material 150 by the inspection device 10. FIG. A method of inspecting the coating state of the frame material 150 using the inspection apparatus 10 will be described with reference to FIGS. 7A to 7E. 7A to 7E, illustration of the control unit 70 and the display unit 80 is omitted.

The pallet 20 with the batteries 110 placed thereon is conveyed in the conveying direction X by the conveyor 31 of the drive unit 30 (see FIG. 6).

As shown in FIG. 7A , the control unit 70 controls the operation of the stopper 32 to raise the stopper 32 to stop and position the pallet 20 above the pallet locate 33 .

Next, as shown in FIG. 7B , the control unit 70 controls the operation of the pallet locate 33 , places the pallet 20 on it, raises it while keeping it horizontal, and presses the pallet 20 against the housing 40 . Thereby, the battery 110 and the frame member 150 on the pallet 20 are arranged to face the opening 40H. The housing 40 forms a dark room 40R around the battery 110 and the frame member 150 while the pallet 20 and the housing 40 are in contact with each other without a gap. Also, the overlapping portion 42 is arranged at the edge of the opening 40H so as to overlap the outer peripheral portion of the battery 110 (see FIG. 5B). Also, the battery 110 is arranged inside the vertical wall portion 43 of the opening 40H.

Next, as shown in FIG. 7C, the control unit 70 controls the operation of the irradiation unit 50 to irradiate the frame member 150 with ultraviolet rays UV. The irradiated ultraviolet rays UV irradiate the entire frame member 150 . At this time, as shown in FIG. 5B, the overlapping portion 42 and the vertical wall portion 43 of the housing 40 shield the outer peripheral portion of the battery 110 and the pallet 20 from the ultraviolet rays UV. Thereby, it is possible to prevent deterioration of the pallet 20 due to the irradiation of the ultraviolet rays UV.

The control unit 70 controls the operation of the imaging unit 60 at the same time that the irradiation unit 50 starts irradiation, and images the entire frame member 150 . The captured image data is transmitted to the control section 70 and image-processed by the control section 70 .

The control unit 70 performs pixel processing only on the image data of the frame material 150 and determines whether the coating state of the frame material 150 is good or bad. The control unit 70 compares the result of the image processing with the pre-stored normal shape of the frame material 150, and if the shape difference between the shape of the captured image and the normal shape is greater than or equal to a specified value, the frame material 150 is determined. It is determined that the coating state is bad, and if the difference in shape is within the specified range, the coating state of the frame member 150 is determined to be good. In this way, by automating the determination of the coating state of the frame material 150, continuous operation is possible without stopping production in the production line for mass production. When the imaging unit 60 finishes imaging, the control unit 70 controls the operation of the irradiation unit 50 to stop the irradiation by the irradiation unit 50 .

The control unit 70 controls the operation of the display unit 80 to display the determination result of the coating state of the frame material 150 and the image data captured by the imaging unit 60 . At this time, if the coating state of the frame material 150 is determined to be defective, the inspector visually inspects the image displayed on the display unit 80 or the battery 110 itself when performing the external appearance inspection of the battery 110. Appearance inspection of the coating state of the frame member 150 is performed, and a final judgment is made.

Next, as shown in FIG. 7D, the controller 70 controls the operation of the stopper 32 and the pallet locate 33 to lower the stopper 32 and the pallet locate 33. As shown in FIG. As a result, as shown in FIG. 7E, the pallet 20 is placed on the upper surface of the conveyor 31, and the conveying of the pallet 20 in the conveying direction by the conveyor 31 is resumed.

As described above, the inspection apparatus 10 of the present embodiment includes the pallet 20 on which the battery 110 is placed, the housing 40 in which the opening 40H is formed in the bottom 41 and the darkroom 40R is formed around the battery 110, It has an irradiation unit 50 that irradiates the surface of the battery 110 in the darkroom 40R with ultraviolet UV, and an imaging unit 60 that forms image data by imaging the surface (main surface 140) of the battery 110 irradiated with the ultraviolet UV. The bottom portion 41 of the housing 40 has an overlapping portion 42 that overlaps with the outer peripheral portion of the battery 110 at the edge of the opening 40H when viewed from the irradiation direction Z of the ultraviolet rays UV of the irradiation portion 50 .

According to the configuration as described above, the overlapping portion 42 can shield the outer peripheral portion of the battery 110 and the pallet 20 from ultraviolet rays UV. As a result, it is possible to accurately inspect the state of the surface of the battery 110 , such as the coating state of the frame member 150 , while suppressing deterioration of the pallet 20 due to the irradiation of the ultraviolet rays UV.

Further, the bottom portion 41 of the housing 40 has a vertical wall portion 43 extending from the overlapping portion 42 in the irradiation direction Z of the ultraviolet rays UV of the irradiation portion 50 . Thus, when the vertical wall portion 43 is in contact with the upper surface 20S of the pallet 20, the overlapping portion 42 does not come into contact with the battery 110, and the overlapping portion 42 can reliably shield the pallet 20 from ultraviolet rays UV. Since the overlapping portion 42 of the housing 40 does not contact the battery 110, deformation of the battery 110 due to the contact of the housing 40 can be prevented.

Also, the pallet 20 can hold a plurality of batteries 110 . Thereby, the irradiation unit 50 can irradiate the plurality of batteries 110 with the ultraviolet rays UV at the same time. Therefore, the cycle time required for manufacturing each battery 110 can be shortened, and productivity is improved.

Moreover, it further has a pallet locate 33 (corresponding to a moving part) for moving the pallet 20 in the direction toward or away from the housing 40 .

Although the inspection apparatus 10 has been described through the embodiments, the present invention is not limited to the configurations described in the embodiments, and can be appropriately modified based on the description of the claims.

For example, the object to be inspected by the inspection device is not limited to the frame material (coating agent) applied to the surface of the battery, but may be another component added to the battery or foreign matter adhering to the surface of the battery.

In addition, although the control unit automatically performs image processing to determine the quality of the coating state, the present invention is not limited to this, and the inspector may determine the quality of the coating state from the image data captured by the imaging unit. .

Moreover, the inspection apparatus may include configurations other than those described in the above-described embodiments, or may not include some of the configurations described in the above-described embodiments.

10 inspection equipment,
20 pallets,
30 drive unit,
31 conveyor,
32 stopper,
33 pallet locate (moving part),
40 housing,
40H opening,
40R Darkroom,
41 bottom,
42 overlapping portion,
43 vertical wall,
50 irradiation unit,
60 imaging unit,
70 control unit,
80 display unit,
100 battery module,
110 batteries,
110s battery stack,
111 power generation element,
112 outer body,
113 electrode tabs,
120 module case,
130 busbar unit,
140 the main surface (surface) of the battery,
150 frame material,
150R frame material inner space,
160 filler.

Claims (4)

a pallet on which the battery is placed;
a housing having an opening at the bottom and forming a dark room around the battery;
an irradiation unit that irradiates the surface of the battery in the dark room with ultraviolet rays;
an imaging unit that captures an image of the surface of the battery irradiated with ultraviolet rays to form image data;
has
The inspection apparatus according to claim 1, wherein the bottom portion of the housing has an overlapping portion that overlaps an outer peripheral portion of the battery at an edge portion of the opening when viewed from the ultraviolet irradiation direction of the irradiation portion. 2. The inspection apparatus according to claim 1, wherein said bottom portion of said housing has a vertical wall portion extending from said overlapping portion in an irradiation direction of ultraviolet rays of said irradiation portion. 3. The inspection apparatus according to claim 1, wherein said pallet can hold a plurality of said batteries. 4. The inspection apparatus according to any one of claims 1 to 3, further comprising a moving part for moving said pallet in a direction toward or away from said housing.

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