Device and method for inspecting rechargeable battery connection structure
An inspection apparatus for inspecting a rechargeable battery electrode plate-connected structure to check whether electrode plates are properly connected to a current collector plate by filters. The apparatus includes an imaging device arranged on one side of the rechargeable battery electrode plate-connected structure, a first lighting device which illuminates the rechargeable battery electrode plate-connected structure at the same side of the rechargeable battery electrode plate-connected structure as the first lighting device, a second lighting device which illuminates the rechargeable battery electrode plate-connected structure from the opposite side of the rechargeable battery electrode plate-connected structure, and an inspection circuit connected to the imaging device which inspects the connection state of the fillets by analyzing a front lighting image captured by the imaging device when only the first lighting device emits light and a back lighting image captured when only the second lighting device emits light.
1. An inspection apparatus for a rechargeable battery electrode plate-connected structure including a plurality of electrode plates, each having a connecting end portion to be connected to a current collector plate by a fillet, wherein the inspection apparatus is for inspecting a connection state of a fillet formed at a connection portion between each connecting end portion and the current collector plate, the inspection apparatus comprising:
an imaging device arranged on one side of the rechargeable battery electrode plate-connected structure;
a first lighting device which emits inspection light to the rechargeable battery electrode plate-connected structure, with the first lighting device being arranged on the one side of the rechargeable battery electrode plate-connected structure;
a second lighting device which emits inspection light to the rechargeable battery electrode plate-connected structure, with the second lighting device facing the imaging device so that the rechargeable battery electrode plate-connected structure is located between the second lighting device and the imaging device; and
an inspection circuit connected to the imaging device, wherein the inspection circuit inspects the connection state of the fillet by analyzing a front lighting image of the rechargeable battery electrode plate-connected structure, which is captured by the imaging device when only the first lighting device emits the inspection light, and a back lighting image of the rechargeable battery electrode plate-connected structure, which is captured by the imaging device receiving the inspection light of the second lighting device passing through gaps between the electrode plates and the current collector plate when only the second lighting device emits the inspection light, and wherein the inspection circuit detects the positions of the plurality of electrode plates by analyzing the front lighting image that is captured by the imaging device receiving the inspection light emitted from the first lighting device and reflected at illuminated side surfaces of the electrode plates and the current collector plate when only the first lighting device emits the inspection light.
2. The inspection apparatus according to claim 1 , wherein the inspection circuit plurality obtains the shape of each fillet by analyzing a back lighting image.
3. The inspection apparatus according to claim 1 , wherein:
the inspection apparatus obtains the quantity of rectangular fillet cutout frames, each of which includes first and second sides respectively corresponding to two opposing major surfaces of two adjacent electrode plates and a lower side corresponding to an upper surface of a fillet, and determines the quantity of the fillets from the quantity of fillet cutout frames; and
the inspection circuit obtains the positions of the first and the second sides of the fillet cutout frame using the front lighting image and the position of the lower side of the fillet cutout frame using the back lighting image.
4. The inspection apparatus according to claim 1 , wherein the inspection circuit obtains at least one of the thickness of each electrode plate, the quantity of the electrode plates, and the height of each electrode plate from the positions of the plurality of electrode plates using the front lighting image.
5. The inspection apparatus according to claim 1 , wherein the inspection circuit obtains the thickness of the fillet from the current collector plate using the front lighting image and determines appropriateness of the obtained thickness of the fillet.
6. The inspection apparatus according to claim 1 , wherein the inspection circuit obtains the position of a reference line in a thicknesswise direction of the fillet using the back lighting image.
7. A method for inspecting a rechargeable battery electrode plate-connected structure including a plurality of electrode plates, each having a connecting end portion to be connected to a current collector plate by a fillet, in which a connection state of a fillet formed at a connection portion between each connecting end portion and the current collector plate is inspected, the method comprising:
illuminating, with the inspection light emitted from a first lighting device, one side of the rechargeable battery electrode plate-connected structure and capturing an image of the connection portion between each electrode plate and the current collector plate at a position facing toward the illuminated side of the rechargeable battery electrode plate-connected structure to acquire a front lighting image of the rechargeable battery electrode plate-connected structure;
illuminating, with the inspection light emitted from a second lighting device, the rechargeable battery electrode plate-connected structure from the other side of the rechargeable battery electrode plate-connected structure and capturing an image of the connection portion between each electrode plate and the current collector plate at a position facing toward a side of the rechargeable battery electrode plate-connected structure opposite the illuminated side by receiving the inspection light of the second lighting device passing through gaps between the electrode plates and the current collector plate to acquire a back lighting image of the rechargeable battery electrode plate-connected structure; and
inspecting the connection state of the fillet by analyzing both the front lighting image and the back lighting image of the rechargeable battery electrode plate-connected structure, wherein the inspecting includes detecting the positions of the plurality of electrode plates by analyzing the front lighting image that is captured by receiving the inspection light emitted from the first lighting device and reflected at illuminated side surfaces of the electrode plates and the current collector plate when only the first lighting device emits the inspection light.
8. The inspection method according to claim 7 , wherein said inspecting includes detecting each fillet from the back lighting image.
9. The inspection method according to claim 7 , wherein said inspecting step includes:
obtaining the quantity of rectangular fillet cutout frames, each of which includes first and second sides respectively corresponding to two opposing major surfaces of two adjacent electrode plates and a lower side corresponding to an upper surface of a fillet, and determining the quantity of the fillets from the quantity of fillet cutout frames; and
obtaining the positions of the first and the second sides of the fillet cutout frame using the front lighting image, and obtaining the position of the lower side of the fillet cutout frame using the back lighting image.
10. The inspection method according to claim 7 , wherein said inspecting includes obtaining at least one of the thickness of each electrode plate, the quantity of the electrode plates, and the height of each electrode plate from the positions of the plurality of electrode plates using the front lighting image.
11. The inspection method according to claim 7 , wherein said inspecting includes obtaining thickness of the fillet from the current collector plate using the front lighting image and determining appropriateness of the obtained thickness of the fillet.
12. The inspection method according to claim 7 , wherein said inspecting step includes obtaining the position of a reference line in a thicknesswise direction of the fillet using the back lighting image.