Winding device, winding method, inspection device and structure manufacturing method

Patent metadata

Field	Value
Publication number	US-9404733-B2
Application number	US-201314388993-A
Country	US
Kind code	B2
Filing date	Jan 24, 2013
Priority date	May 11, 2012
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

Provided is a winding apparatus that is provided with a splitter that splits radiant light from a light source unit into measurement light applied to a side face part of a first sheet and a second sheet and reference light applied to a reference surface, an interference detector that detects interference light formed by interference between the reference light reflected by the reference surface and the measurement light reflected by the side face part, a position detector that detects the position of the first sheet and the position of the second sheet on the basis of the detected interference light, and a decision processor that decides the quality of the wound body on the basis of the detected positions of the first sheet and the second sheet.

First claim

The invention claimed is:

1. A winding apparatus that winds a first sheet and a second sheet that are stuck together on a winding core to form a wound body, the winding apparatus comprising:
a drive that rotates the winding core to wind the first and second sheets around the winding core to form the wound body;
a light source unit that emits radiant light;
a splitter that splits the radiant light into measurement light and reference light;
a measurement head that directs the measurement light to an end face of the wound together first and second sheets on an optical path, and directs the measurement light reflected from the end face of the wound together first and second sheets on said optical path, wherein a traveling direction of the measurement light coincides with an axial direction of the wound body;
optics that direct the reference light to a reference surface;
an OCT processor programmed to detect interference light formed by interference between the reference light reflected by the reference surface and the measurement light reflected by the end face, and programmed to detect a position of the first sheet and a position of the second sheet based on the detected interference light; and
a decision processor programmed to decide quality of the wound body based on the detected positions of the first sheet and the second sheet.

2. The winding apparatus according to claim 1 , wherein the OCT processor is programmed to detect the position of the first sheet and the position of the second sheet by performing frequency analysis on a signal based on the detected interference light.

3. The winding apparatus according to claim 2 , wherein the position detector detects the position of the first sheet and the position of the second sheet based on peak shapes included in intensity distribution of the interference light obtained as a result of the frequency analysis.

4. The winding apparatus according to claim 2 , further comprising a feedback controller that outputs a feedback signal for adjusting a position of the first sheet or a position of the second sheet based on the detected positions of the first sheet and the second sheet.

5. The winding apparatus according to claim 4 , wherein the light source unit includes a light source that emits radiant light having a wavelength that varies at a constant period.

6. The winding apparatus according to claim 5 , wherein the radiant light is infrared light.

7. The winding apparatus according to claim 6 , wherein the first sheet is an electrode and the second sheet is a separator.

8. The winding apparatus according to claim 7 , further comprising a sticking roll that sticks the first sheet and the second sheet together.

9. The winding apparatus according to claim 8 , further comprising a first optical member, wherein
the first optical member irradiates, with the measurement light, a position that is located on the end face as well as between a contact point at which the first sheet and the second sheet start being wound on the wound body and the sticking roll.

10. The winding apparatus according to claim 9 , wherein the first optical member forms the measurement light so that a spot diameter of the measurement light in the end face is 90% or more and 110% or less of a total thickness of the first sheet and the second sheet.

11. The winding apparatus according to claim 9 , wherein the first optical member forms a spot shape of the measurement light applied to the end face into an elliptical shape with a long axis of the elliptical shaped spot perpendicular to movement direction of the stuck together first and second sheets.

12. The winding apparatus according to claim 9 , wherein the first optical member forms a spot shape of the measurement light applied to the end face into an elliptical shape with a long axis of the elliptical shaped spot perpendicular to a movement direction of the first sheet and the second sheet stuck together, and such that a length of the long axis of the elliptical shaped spot in the end face is 90% or more and 110% or less of a total thickness of the first sheet and the second sheet.

13. The winding apparatus according to claim 1 , further comprising a second optical member, wherein
the second optical member irradiates, with the measurement light, a position that is located on the end face as well as on a contact point at which the first sheet and the second sheet start being wound on the wound body, and the second optical member forms the measurement light so that a spot diameter of the measurement light in the end face is 90% or more and 110% or less of a total thickness of the first sheet and the second sheet.

14. An inspection device that inspects a wound body formed by winding a first sheet and a second sheet together, the inspection device comprising:
a light source unit that emits radiant light;
a splitter that splits the radiant light into measurement light and reference light;
a measurement head that directs the measurement light to an end face of the wound together first and second sheets on an optical path, and directs the measurement light reflected from the end face of the wound together first and second sheets on said optical path, wherein a traveling direction of the measurement light coincides with an axial direction of the wound body;
optics that direct the reference light to a reference surface;
an OCT processor programmed to detect interference light formed by interference between the reference light reflected by the reference surface and the measurement light reflected by the end face, and programmed to detect a position of the first sheet and a position of the second sheet based on the detected interference light; and
a decision processor programmed to decide quality of the wound body based on the detected positions of the first sheet and the second sheet.

15. The inspection device according to claim 14 , further comprising a first optical member that forms the measurement light so that a spot diameter of the measurement light in the end face is 90% or more and 110% or less of a total thickness of the first sheet and the second sheet.

16. A battery manufacturing method comprising:
inspecting the wound body using the inspection device according to claim 14 ; and
manufacturing a battery including the inspected wound body.

17. A capacitor manufacturing method comprising:
inspecting the wound body using the inspection device according to claim 14 ; and
manufacturing a capacitor including the inspected wound body.

18. A winding method comprising:
winding a first sheet and a second sheet that are stuck together on a winding core to form a wound body;
directing, with a measurement head, measurement light to an end face of the wound together first and second sheets on an optical path, and directing the measurement light reflected from the end face of the wound together first and second sheets on said optical path, wherein a traveling direction of the measurement light coincides with an axial direction of the wound body;
directing with optics the reference light to a reference surface;
detecting, with an OCT processor, interference light formed by interference between the reference light reflected by the reference surface and the measurement light reflected by the end face;
detecting, with the OCT processor, a position of the first sheet and a position of the second sheet based on the detected interference light; and
deciding, with a decision processor, quality of the wound body based on the detected positions of the first sheet and the second sheet.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Kabetani Yasuhiro
• Furuta Tomotaka
• Hara Nobuo
• Aoki Shohei
• Hamano Seiji

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• G01N21/4795

  spatially resolved investigating of object in scattering medium (in vivo A61B) · CPC title

• G01N21/8901

  Optical details; Scanning details (per se G02B) · CPC title

• G01B11/14 Primary

  for measuring distance or clearance between spaced objects or spaced apertures (G01B11/26 takes precedence; rangefinders G01C3/00) · CPC title

• H01M10/0409 Primary

  for cells with wound electrodes · CPC title