JP2001338693A - Winding device and winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to remarkably improve the forming efficiency of a wound electrode body. SOLUTION: A coating start position of a negative pole activator, to be fed to a winding means, is detected, and based on the detected coating start position of the negative pole activator, the feeding volume of a negative pole is detected, and a coating start position of a positive pole activator to be fed to the winding means, is detected, and based on the detected coating start position of the positive pole activator, the feeding volume of the positive pole is detected. Afterwards, based on the detected feeding volumes of the negative pole and the positive pole, by checking the laminating state of a coated area of the negative pole activator and the positive pole activator, the laminating state of the coated area of the negative pole activator and the positive pole activator at the starting side of winding are easily checked by winding the negative pole and the positive pole without unwinding the wound electrode body formed by winding the negative pole and the positive pole, thus, the forming efficiency of the wound electrode body can be remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device and a winding method, and is suitably applied, for example, to a winding device for forming a wound electrode body for a non-aqueous electrolyte secondary battery.

[0002]

2. Description of the Related Art Conventionally, in a non-aqueous electrolyte secondary battery,
As a negative electrode active material, lithium, lithium ion alloy,
A material capable of doping and undoping lithium ions such as a carbon material is used, and a lithium composite oxide such as a lithium cobalt composite oxide is used as a positive electrode active material.

In a non-aqueous electrolyte secondary battery,
It functions as a battery by reacting these negative electrode active materials and positive electrode active materials, and has a relatively high battery voltage, a relatively high energy density, and excellent charge / discharge cycle characteristics. It has been used widely in recent years because of its many advantages.

Actually, as shown in FIG. 12, in a non-aqueous electrolyte secondary battery 1, a negative electrode active material is applied in a film form on both surfaces of a negative electrode current collector made of a strip of copper foil or the like. The formed negative electrode 2 and the positive electrode 3 formed by applying a positive electrode active material in a film form on both surfaces of a positive electrode current collector made of a band-shaped aluminum foil or the like are formed of a band-shaped microporous polypropylene film. A wound electrode body 6 formed by being wound while being insulated from each other via two first and second separators 4 and 5
The positive electrode lead 7 is welded to the winding start portion of the positive electrode 3, and the negative electrode lead 8
Are welded.

In this non-aqueous electrolyte secondary battery 1, a wound electrode body 6 is inserted into a cylindrical negative electrode can 9, and a negative electrode lead 8 is electrically and electrically connected to the bottom of the negative electrode can 9. While being mechanically connected, the negative electrode can 9 is filled with a non-aqueous electrolyte (not shown) and impregnated in the first and second separators 4 and 5.

In the non-aqueous electrolyte secondary battery 1, a safety valve 10 and a positive electrode cover 11 are integrally fitted into an opening of the negative electrode can 9 and hermetically sealed. Are electrically and mechanically connected.

As a result, in the non-aqueous electrolyte secondary battery 1, the battery voltage generated by the discharge reaction of the internal negative electrode 2 and positive electrode 3 can be output to the outside via the negative electrode can 9 and the positive electrode cover 11. ing.

Here, the wound electrode body 6 of the nonaqueous electrolyte secondary battery 1 can be formed using a winding device.

That is, in the winding device, a negative electrode reel and a positive electrode reel are mounted, and the negative electrode reel is previously provided on both surfaces of the negative electrode current collector with active material application areas of the negative electrode active material. And the active material-uncoated region are alternately formed to form a negative electrode 2 for a large number of non-aqueous electrolyte secondary batteries.
While the negative electrode material having the above is wound, on the positive electrode reel, active material application areas and active material non-application areas of the positive electrode active material are alternately formed in advance on both surfaces of the positive electrode current collector in advance. A positive electrode material having the positive electrode 3 for a number of nonaqueous electrolyte secondary batteries is wound.

In the winding device, a first separator reel on which a first separator 4 having a length corresponding to a number of non-aqueous electrolyte secondary batteries is wound is attached. A second separator reel around which a second separator 5 having a length corresponding to a number of non-aqueous electrolyte secondary batteries is wound is attached.

In the winding device, the negative electrode material drawn from the negative electrode reel, the positive electrode material drawn from the positive electrode reel, the first separator 4 drawn from the first separator reel, and the second Laminating the second separator 5 pulled out from the separator reel in the order of the positive electrode material, the first separator 4, the negative electrode material, and the second separator 5, and winding the core material around the core with the positive electrode material inside. Thereby, the wound electrode body 6 in which the positive electrode 3, the first separator 4, the negative electrode 2, and the second separator 5 are wound can be sequentially formed.

[0012]

By the way, in the non-aqueous electrolyte secondary battery 1, the length of the active material application region along the longitudinal direction of the positive electrode 3 is longer than that of the non-aqueous electrolyte secondary battery 1. The length of the active material application area along the longitudinal direction of the negative electrode 2 is selected according to a preset battery voltage.
Is longer than the length of the active material application region.

In the non-aqueous electrolyte secondary battery 1, the wound electrode body is laminated so that the active material application region of the positive electrode 3 is located inside the active material application region along the longitudinal direction of the negative electrode 2. The formation of 6 allows the entire positive electrode active material to react with the negative electrode active material and output a specified battery voltage.

On the other hand, in the non-aqueous electrolyte secondary battery 1,
For example, when the wound electrode body 6 is formed by being wound with the active material application region of the positive electrode 3 protruding outside the active material application region of the negative electrode 2, the positive electrode active material protrudes. The portion cannot be reacted with the negative electrode active material, and a voltage lower than the specified battery voltage is output.

Therefore, in the step of forming the spirally wound electrode body 6, the spirally wound electrode body 6 formed by using the spirally winding device is periodically removed and unwound, so that the inside of the active material application region of the negative electrode 2 is removed. Next, it is examined whether or not the wound electrode body 6 is formed with the active material application region of the positive electrode 3 positioned as specified.

However, in such a sampling inspection, the number of wound electrode bodies 6 formed for manufacturing the non-aqueous electrolyte secondary battery 1 is reduced irrespective of good or defective products. There is a problem that the formation efficiency of the electrode body 6 is reduced.

The present invention has been made in view of the above points, and an object of the present invention is to propose a winding device and a winding method capable of significantly improving the efficiency of forming a wound electrode body.

[0018]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention detects the starting position of application of the negative electrode active material of the negative electrode sent to the winding means and starts the application of the detected negative electrode active material. While detecting the feed amount of the negative electrode based on the position, detecting the application start position of the positive electrode active material of the positive electrode sent to the winding means, and using the detected positive electrode active material application start position as the reference, After detecting the feed amount of the negative electrode and the positive electrode, based on the detected feed amount of the negative electrode and the positive electrode, the application region of the negative electrode active material and the application region of the positive electrode active material on the winding start side of the negative electrode and the positive electrode. Was inspected.

Therefore, the active material for the negative electrode on the winding start side of the negative electrode and the positive electrode while winding the negative electrode and the positive electrode without unwinding the wound electrode body formed by winding the negative electrode and the positive electrode It is possible to easily inspect the lamination state between the application region of the positive electrode and the application region of the positive electrode active material.

Further, in the present invention, the application end position of the negative electrode active material applied to the negative electrode sent to the winding means is detected, and the feed amount of the negative electrode is determined based on the detected application end position of the negative electrode active material. In addition to detecting the application end position of the positive electrode active material of the positive electrode sent to the winding means, and detecting the feed amount of the positive electrode based on the detected application end position of the positive electrode active material, the detection is performed. Based on the feed amount of the negative electrode and the feed amount of the positive electrode, the state of lamination of the application region of the negative electrode active material and the application region of the positive electrode active material on the winding end side of the negative electrode and the positive electrode was inspected.

Accordingly, the active material for the negative electrode on the winding end side of the negative electrode and the positive electrode while winding the negative electrode and the positive electrode without unwinding the wound electrode body formed by winding the negative electrode and the positive electrode It is possible to easily inspect the lamination state between the application region of the positive electrode and the application region of the positive electrode active material.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 20 denotes a schematic configuration of the winding device according to the present invention as a whole,
1A, a negative electrode reel 22, a positive electrode reel 23, a first separator reel 24, and a second separator reel 2
5 is attached.

As shown in FIG. 2, a negative electrode active material 27 is provided on both sides of a strip-shaped negative electrode current collector 26, as shown in FIG.
Negative electrode having negative electrodes for a large number of non-aqueous electrolyte secondary batteries by sequentially and alternately forming active material-coated regions 26A coated with a film and active material-uncoated regions 26B of the negative electrode active material 27. The material 28 is wound.

As shown in FIG. 3, the positive electrode reel 23 has an active material application region 29A in which a positive electrode active material 30 is applied on both sides of a belt-shaped positive electrode current collector 29, The positive electrode material 31 having the positive electrodes for a number of non-aqueous electrolyte secondary batteries is wound by alternately forming the active material non-application regions 29B of the active material 30 alternately.

Further, as shown in FIG. 1, a first separator 32 having a length corresponding to a number of non-aqueous electrolyte secondary batteries is wound around the first separator reel 24. The second separator reel 25 has a second separator 33 having a length corresponding to a number of non-aqueous electrolyte secondary batteries.
Is wound.

In the winding device 20, the negative electrode material 28 drawn from the negative electrode reel 22 is fed to the winding portion 37 along the first and second negative electrode guide rollers 35 and 36 in order. ing.

Here, a negative electrode sensor 38 is disposed near the second negative electrode guide roller 36 so as to face one surface of the negative electrode material 28, and a winding portion is formed by using the negative electrode sensor 38. The boundary position (that is, the application start position and the application end position of the active material application region 26A) between the active material application region 26A of the negative electrode material 28 and the active material non-application region 26B sent to the negative electrode material 37 is sequentially detected. It has been done.

In the vicinity of the second negative electrode guide roller 36, a direction in which a negative electrode cutter 39 attached to a predetermined slide mechanism (not shown) abuts its cutting edge against one surface of the negative electrode material 28, and It is slidably arranged in a direction away from the opposite direction.

In the winding device 20, the negative electrode cutter 39 is moved based on the boundary position between the active material application area 26 A and the active material non-application area 26 B of the negative electrode material 28 detected by using the negative electrode sensor 38. The anode material 28 is slid, and the blade tip is brought into contact with a predetermined position of the active material non-applied area 26B of the negative electrode material 28, thereby bringing the negative electrode material 28 into the active material unapplied area 26B.
It can be cut at a predetermined position.

Thus, in the winding device 20, the negative electrode material 28 pulled out from the negative electrode reel 22 is sent to the winding portion 37, and the negative electrode material 28 is cut using the negative electrode sensor 38 and the negative electrode cutter 39. The winding part 3
7, a negative electrode obtained by separating from the negative electrode material 28 can be sequentially supplied.

On the other hand, in the winding device 20, the positive electrode material 31 drawn from the positive electrode reel 23 is sequentially wound along the first and second positive electrode guide rollers 40 and 41 to form the winding section 3.
Send up to 7.

Here, a positive electrode sensor 42 is disposed near the second positive electrode guide roller 41 so as to face one surface of the positive electrode material 31, and the winding section is formed by using the positive electrode sensor 42. The boundary position between the active material application region 29A of the positive electrode material 31 and the active material non-application region 29B sent to the positive electrode material 37 (that is, the application start position and the application end position of the active material application region 29A) can be sequentially detected. It has been done.

In the vicinity of the second positive electrode guide roller 41, a positive electrode cutter 43 attached to a predetermined slide mechanism (not shown) is used to determine the direction in which its cutting edge abuts against one surface of the positive electrode material 31, and It is slidably arranged in a direction away from the opposite direction.

In the winding device 20, the positive cutter 43 is slid based on the boundary position between the active material application region 29A and the active material non-application region 29B of the positive electrode material 31 detected by using the positive electrode sensor 42. And the cutting edge is positive electrode material 3
The positive electrode material 31 can be cut at a predetermined position of the active material non-applied region 29B by abutting the active material non-applied region 29B at a predetermined position.

Thus, in the winding device 20, the positive electrode material 31 drawn from the positive electrode reel 23 is sent to the winding portion 37, and the positive electrode material 31 is cut using the positive electrode sensor 42 and the positive electrode cutter 43. The winding part 3
A positive electrode obtained by separating the positive electrode material 7 from the positive electrode material 31 can be sequentially supplied.

In addition, in the winding device 20,
The first separator 32 drawn from the first separator reel 24 is sent to the winding portion 37 along the first separator guide roller 44, and the second separator drawn from the second separator reel 25 33 along the second separator guide roller 45 and the winding portion 3
Send up to 7.

Here, the winding portion 37 has a disc-shaped core holding member 48, and the core holding member 48 has its center axis (hereinafter referred to as the member center axis) 48A as a center. And is rotatably supported by the side wall 21A of the device housing 21.

In the vicinity of the outermost periphery of one surface of the core holding member 48, three cylindrical cores 49 to 51 are arranged at intervals of about 120 degrees around the member central axis 48A. Hereinafter, this is referred to as a winding center axis.)

In the winding portion 37, the winding cores 49 to 51 are turned obliquely to the right of the member central axis 48A by rotating the winding core holding member 48 by about 120 degrees about the member central axis 48A. An upper electrode material winding position, a tape attaching position below the member central axis 48A, and an electrode body take-out position diagonally above and to the left of the member central axis 48A are arranged in a circulating manner.

Actually, in the winding portion 37, the winding core 49
Slits 49A along the center axis of the winding core at 51
51A is formed, the first and second separators 32 and 33 are laminated and sandwiched between slits 49A of a core 49 arranged at the electrode material winding position, and a predetermined motor (not shown) is provided in this state. ), The core 49 is rotated about the center axis of the core in conjunction with the rotation of the output shaft of the motor.

In the winding section 37, the winding core 49
While the first and second separators 32 and 33 are wound around the first and second separators 3 at a predetermined timing.
A negative electrode material 28 is interposed between the active material non-applied area 26B and the active material applied area 26A between the active material applied area 26A and the positive electrode material 31 on the first separator 32. Adjust to 29A.

As a result, in the winding portion 37, the positive electrode material 31 and the first material are attached to the winding core 49 disposed at the electrode material winding position.
, The negative electrode material 28, and the second separator 33, with the positive electrode material 31 inside, and the positive electrode material 3
The first and negative electrode materials 28 are wound in a state where they are insulated from each other via first and second separators 32 and 33.

In the winding part 37, the negative electrode material 28 and the positive electrode material 31 wound around the winding core 49 together with the first and second separators 32 and 33 are used as a negative electrode and a positive electrode, respectively. When the negative electrode and the positive electrode are wound around the core 49 to the end using the cutter 43, the rotation of the core 49 is stopped.

Here, the pressing members 52 to 54 are moved on one surface of the core holding member 48 in a direction in which the pressing members 52 to 54 are pressed against the cores 49 to 51 by a predetermined pressing mechanism (not shown) and in a direction away from the cores 49 to 51. It is arranged freely.

Further, in the vicinity of the electrode material winding position, a separator cutter 55 attached to a predetermined slide mechanism (not shown) has its cutting edge stacked on the first separator 32, the second separator. The separator 33 is slidably disposed in a direction in which the separator 33 comes into contact with one surface and in a direction away from the separator 33.

Thus, in the core portion 37, when the rotation of the core 49 around which the positive electrode, the first separator 32, the negative electrode, and the second separator 33 are wound at the electrode material winding position is stopped, Positive electrode wound around core 49, first
Of the separator 32, the negative electrode, and the second separator 33 located at the outermost periphery of the second separator 33. In this state, the cutting edge of the separator cutter 55 is placed on one surface of the second separator 33. The first separator 32 together with the second separator 33
Disconnect.

Thus, in the winding portion 37, the core 4
9 and the first and second separators 32 and 3
By cutting 3 while leaving the positive electrode and the negative electrode on the winding core 49 side to the extent that the positive electrode and the negative electrode can be insulated from each other, a winding wound in a state in which the positive electrode, the first separator 32, the negative electrode, and the second separator 33 are laminated. In addition to forming the electrode body 56, the pressing member 52 can prevent the positive electrode, the first separator 32, the negative electrode, and the second separator 33 wound around the core 49 from being unwound.

In the wound portion 37, when the wound electrode body 56 is formed by the winding core 49 disposed at the electrode material winding position, the wound electrode body 56 is prevented from being unwound by the pressing member 52. By rotating the core holding member 48 clockwise by about 120 degrees, the wound electrode body 56 together with the core 49 is moved to the tape attaching position.

A tape reel 58 around which an adhesive tape 57 having a predetermined adhesive applied to one side is wound is attached to the lower side of the tape attaching position, and is pulled out from the tape reel 58. The adhesive tape 57 is fed along a tape guide roller 59 to a predetermined tape sticking mechanism 60 arranged near the tape sticking position.

Thus, the tape adhering mechanism 60 adheres the adhesive tape 57 to the terminal end of the second separator 33 that is the outermost periphery of the wound electrode body 56 disposed at the tape adhering position. Even after the pressing member 52 is removed, the wound electrode body 56 is prevented from being unwound.

Next, in the winding part 37, the winding core holding member 48 is again rotated clockwise by about 120 degrees so that the winding electrode body 56 is wound together with the winding core 49 arranged at the tape attaching position. Move to the body removal position.

An electrode body take-out mechanism 61 and an electrode body transport mechanism 62 are disposed near the electrode body take-out position. The electrode body take-out mechanism 61 includes an electrode body take-out part 63 and an electrode body delivery part. 64.

In the electrode body take-out part 63, the first guide rail 65 has its longitudinal direction substantially parallel to the left-right direction, and is rotated clockwise by about 180 degrees around the center in the longitudinal direction. Device housing 2 so that it can rotate
And electrode body holding arms 66 and 67 above and below the first guide rail 65.
Are slidably mounted in the left-right direction.

In the electrode body transfer section 64, the second
The guide rail 68 is attached to the side wall 21 </ b> A of the device housing 21 with its longitudinal direction substantially parallel to the vertical direction, and the transfer arm 69 is attached to the second guide rail 68.
Are slidably mounted in the vertical direction.

On the other hand, in the electrode body transport mechanism 62, the belt holding rail 70 has one end side facing the delivery arm 69 of the electrode body delivery section 64 and the other end side outward from the side wall 21 A of the device housing 21. The electrode body transport belt 71 is protruded and is held on the belt holding rail 70 so as to run freely.

In the electrode body take-out part 63, the electrode body holding arm 66 on the upper side of the first guide rail 65 is slid toward the winding part 37, so that the winding member disposed at the electrode body take-out position is wound. At this time, the electrode body 56 is sandwiched, and at this time, the core 49 inserted into the center of the wound electrode body 56 is moved inside the device housing 21 by a predetermined drawing mechanism (not shown) provided inside the device. , The wound electrode body 56 formed as shown in FIG. 4 can be removed from the winding core 49.

Incidentally, in the wound electrode body 56, the negative electrode lead 72 is provided by a predetermined negative electrode lead welded portion (not shown) disposed between the negative electrode reel 22 and the first negative electrode guide roller 35. While being welded to the negative electrode material 28,
The positive electrode lead 73 is welded to the positive electrode material 31 by a predetermined positive electrode lead welding portion (not shown) arranged between the positive electrode reel 23 and the first positive electrode guide roller 40.

When the wound electrode body 56 is detached from the winding core 49 by using the electrode body holding arm 66 in the electrode body take-out portion 63, the first guide rail 65 is rotated clockwise by 180 degrees. After rotating the electrode body holding arm 66 to the electrode body delivery portion 64 side after rotating the electrode body holding arm 66 by about the angle, the wound electrode body 56 sandwiched by the electrode body holding arm 66 is delivered to the delivery arm 69. And hold it.

As a result, in the electrode body delivery section 64, the delivery arm 69 holding the wound electrode body 56 is slid downward, so that the wound electrode body 5
6 is placed on the electrode body transport belt 71 of the electrode body transport mechanism 62, and thus the wound electrode body 56 is transported by the electrode body transport belt 71 to a predetermined process at the subsequent stage.

Incidentally, in this winding device 20, by providing three winding cores 49 to 51 in the winding portion 37,
Using these three winding cores 49 to 51, the above-described positive electrode, first separator 32, negative electrode, and second separator 33 are placed at the electrode material winding position, the tape attaching position, and the electrode body take-out position. The winding process, the attaching process of the adhesive tape 57, and the removing process of the wound electrode body 56 can be simultaneously performed in parallel.

Further, in the winding device 20, by providing two electrode body holding arms 66 and 67 in the electrode body take-out part 63, the wound electrode body 56 with respect to the winding part 37 is provided.
And the delivery process of delivering the removed wound electrode body 56 to the electrode body transport mechanism 62 can be performed simultaneously and in parallel.

Accordingly, in the winding device 20, the negative electrode material 28, the positive electrode material 31, and the first and second separators 32 and 33 are stacked in this order from the positive electrode, the first separator 32, the negative electrode, and the second separator 33. The wound electrode body 56 wound in this state can be efficiently formed and transported to a subsequent step.

FIG. 1 shows a schematic configuration of the winding device 20 according to the present embodiment, but the detailed configuration is described in Japanese Patent Application No. 9-2910 filed earlier by the present applicant.
This is the same as that described in JP-A-53909 (JP-A-11-97056).

In addition to this configuration, in the case of this winding device 20, as shown in FIG.
Control unit 7 having PU (Central Processing Unit) and the like
5 is stored, and the control unit 75 controls various mechanisms and the like of the entire winding device 20 so that a series of forming processes for the wound electrode body 56 described above with reference to FIG. 1 can be executed. I have.

In the inside of the apparatus housing 21, the first
A negative electrode rotary encoder 76 is attached to the base of the negative electrode guide roller 35 and the first
The positive electrode rotary encoder 77 is attached to the base of the positive electrode guide roller 40.

The negative rotary encoder 76 is a first rotary encoder.
When the negative electrode material 28 along the negative electrode guide roller 35 is sent to the winding portion 37 (FIG. 1), the rotation angle of the first negative electrode guide roller 35 that rotates according to the feed amount of the negative electrode material 28 Is detected, and the obtained detection result is sent to the control unit 75 as a pulse signal.

On the other hand, the positive rotary encoder 77
Is configured in the same way as the rotary encoder 76 for the negative electrode, and the positive electrode material 31 along the first positive electrode guide roller 40 is sent to the winding portion 37 so that the positive electrode material 31
The first positive electrode guide roller 4 that rotates according to the feed amount of the positive electrode
A rotation angle of 0 is detected, and the obtained detection result is sent to the control unit 75 as a pulse signal.

The negative electrode sensor 38 described above with reference to FIG. 1 has a light receiving portion and, for example, a plurality of light emitting elements arranged in parallel, and emits light on one surface of the negative electrode material 28 sent to the winding portion 37. By irradiating a light beam obtained by causing the element to emit light, reflected light obtained by reflecting the light beam on the one surface is received by a light receiving unit, and the obtained light receiving result is sent to the control unit 75 as a photoelectric signal.

The positive electrode sensor 42 described above with reference to FIG. 1 is also configured in the same manner as the negative electrode sensor 38, and is obtained by causing a light emitting element to emit light on one surface of the positive electrode material 31 sent to the winding portion 37. The reflected light obtained by irradiating the light beam on one surface thereof is received by the light receiving unit, and the obtained light receiving result is sent to the control unit 75 as a photoelectric signal.

When the negative electrode material 28 and the positive electrode material 31 are sent to the winding part 37, the control unit 75 determines the active material application start position of the negative electrode material 28 based on the photoelectric signal given from the negative electrode sensor 38. At the same time as detecting the active material application start position, resets a negative electrode counter (not shown) provided therein, and based on a pulse signal given from the negative electrode rotary encoder 76. The negative electrode counter starts counting up, and thus, based on the count value of the negative electrode counter, the negative electrode material 28 is detected from the time when the active material application start position is detected.
Detects the feed amount sent to the winding unit 37.

The control unit 75 detects the start position of the active material application of the positive electrode material 31 sent to the winding unit 37 based on the photoelectric signal given from the positive electrode sensor 42, and detects the active material application position. When the start position is detected,
A positive counter (not shown) provided inside is reset, and the positive counter starts counting up based on a pulse signal given from the positive rotary encoder 77.

The control unit 75 detects that the negative electrode material 28 has been fed by a predetermined feed amount (hereinafter referred to as a set feed amount) based on the count value of the negative electrode counter. Then, based on the count value of the positive electrode counter at the detected timing, the positive electrode material 31
From the time when the active material application start position of the positive electrode material 3 is detected.
1 detects the feed amount sent to the winding unit 37 (hereinafter, this is referred to as a winding start side feed amount).

As a result, the control section 75 subtracts the winding start side feed amount of the positive electrode material 31 from the set feed amount of the negative electrode material 28, as shown in FIG. From the active material application start position 27A to the positive electrode material 31
To the active material application start position 30A, that is, the length of the portion where the active material application region 29A of the positive electrode material 31 is not stacked on the active material application region 26A of the negative electrode material 28 on the winding start side (hereinafter, referred to as the length). This is referred to as a winding start side unlaminated length) α is calculated.

The control section 75 (FIG. 5) controls the winding section 37 based on the photoelectric signal supplied from the positive sensor 42.
When the active material application end position of the positive electrode material 31 sent to the positive electrode material 31 is detected, the positive electrode counter is reset again at the timing when the active material application end position is detected, and a pulse signal given from the positive electrode rotary encoder 77 is output. The positive-electrode counter starts counting up based on the count value of the positive-electrode counter, and the amount of the positive-electrode material 31 sent to the winding portion 37 from the time when the active-material application end position of the positive-electrode material 31 is detected based on the count value Detect the feed amount.

In addition, the control unit 75 controls the winding unit 37 based on the photoelectric signal given from the negative electrode sensor 38.
When the active material application end position of the negative electrode material 28 being sent to the negative electrode material 28 is detected, the negative electrode counter is reset again at the timing when the active material application end position is detected, and a pulse signal given from the negative electrode rotary encoder 76 is output. Then, the negative counter starts counting up.

In this state, based on the count value of the positive electrode counter, the control unit 75 sends the predetermined position of the active material non-applied area 29B of the positive electrode material 31 to the cutting position using the positive electrode cutter 43. Is detected, the predetermined position of the active material non-applied region 29B of the positive electrode material 31 is changed to the cutting position from the time when the active material application end position of the negative electrode material 28 is detected based on the count value of the negative electrode counter at the detected timing. Is detected, the feed amount of the negative electrode material 28 sent to the winding portion 37 up to the time when the negative electrode material 28 is reached (hereinafter referred to as the winding end side feed amount) is detected.

Thus, the control unit 75 controls the feed amount of the positive electrode material 31 (hereinafter referred to as the feed amount) from when the active material application end position of the positive electrode material 31 is detected to when the predetermined position of the active material non-applied region 29B reaches the cutting position. , Which is called the reference feed amount)
By subtracting the winding end side feed amount of the negative electrode material 28,
As shown in FIG. 7, the length from the active material application end position 30B of the positive electrode material 31 on the winding end side to the active material application end position 27B of the negative electrode material 28, that is, the active material of the negative electrode material 28 on the winding end side. The length β of the portion where the active material application region 29A of the positive electrode material 31 is not laminated on the material application region 26A (hereinafter, this is referred to as a winding end side non-lamination length) β is calculated.

The control unit 75 determines that the winding start side unlaminated length α is a length within a predetermined first specified range and that the winding end side unlaminated length β is It is determined whether the length is within the set second predetermined range,
When both the winding-start-side unstacked length α and the winding-end-side unstacked length β are within the corresponding first and second specified ranges, as shown in FIG. The wound electrode body 56 is formed inside the active material application region 26A of the negative electrode 80 separated from the cathode material 31 with the active material application region 29A of the positive electrode 81 separated from the positive electrode material 31 positioned as specified. As a result, the wound electrode body 56 is determined to be non-defective.

On the other hand, the control unit 75 determines the first and second rules corresponding to at least one of the winding start side unstacked length α and the winding end side unstacked length β. If the length is out of the range, the wound electrode body 56 is determined to be defective.

As a result, the controller 75 forms the first and second separators 32 and 33 without unwinding the wound electrode body 56 and inspecting the laminated state of the negative electrode 80 and the positive electrode 81. At the same time, while the negative electrode material 28 and the positive electrode material 31 are wound in a stacked state, the stacked state of the negative electrode 80 and the positive electrode 81 can be easily inspected for all the wound electrode bodies 56 formed as a result. ing.

When the control unit 75 determines whether the formed wound electrode body 56 is a non-defective product or a defective product, based on the result of the determination, the control unit 75 of the electrode body transport mechanism 62 described above with reference to FIG. By controlling a predetermined discharge mechanism (not shown) provided in the vicinity, the wound electrode which is determined to be defective while being conveyed to a predetermined device used in a subsequent process by the electrode body conveyance mechanism 62. The body 56 is automatically discharged from the running electrode body transport belt 71 by using the discharging mechanism, and only the wound electrode body 56 determined to be non-defective is transported to the subsequent device.

At this time, the control unit 75 sets the unlaminated length α on the winding start side with respect to the wound electrode body 56 determined to be non-defective.
And a determination result including information on the unstacked length β on the winding end side,
An inspection result signal including identification information unique to the spirally wound electrode body 56 is transmitted to a subsequent device.

As a result, the control unit 75 can efficiently discharge the wound electrode body 56 determined to be defective while transporting the wound electrode body 56 to the subsequent device. The wound electrode body 56 determined to be non-defective in the subsequent device
In order to carry out the predetermined process by transporting only the wound electrode body 56 of the non-defective product and the non-defective product in the subsequent device, it is possible to improve the operation rate of the subsequent device. Has been made.

Before starting to wind the negative electrode material 28 and the positive electrode material 31 around the core 49, the negative electrode material 28 and the positive electrode material 3
When the winding start side unlaminated length α is calculated from both feed amounts of No. 1, the negative electrode material 28 and the positive electrode material 31 slip when the first and second separators 32 and 33 are moved along. It is considered that the unlaminated length α on the winding start side changes, and as a result, the control unit 75 may erroneously determine that the wound electrode body 56 which is actually a defective product is a good product.

For this reason, the set feed amount of the negative electrode material 28 used for calculating the unlaminated length α on the winding start side is, as shown in FIG. The application start portion of the application region 26A (FIG. 2) is wound, and at least the active material non-application region 29 at the top of the positive electrode material 31
B (FIG. 3) is set assuming a state of being wound, and the control unit 75 calculates the winding start side unstacked length α based on the set feed amount. .

With this, the control unit 75 makes the winding start side unlaminated length α almost accurately with the negative electrode material 28 and the positive electrode material 31 already wound around the winding core 49 based on the set feed amount. Thus, the lamination state of the active material application region 26A of the negative electrode material 28 and the active material application region 29A of the positive electrode material 31 on the winding start side can be accurately inspected.

On the other hand, in the winding device 20, the negative electrode sensor 38 and the negative electrode cutter 39 are compared with the positive electrode sensor 42 and the positive electrode cutter 43 from the winding core 49 disposed at the electrode material winding position. When the positive active material 30 of the positive electrode material 31 and the negative active material 27 of the negative electrode material 28 have uneven thickness, the positive electrode material 31 is located relatively far from the core 49. After detecting the winding end side unlaminated length β by using the unwound portion of the negative electrode material 28 and winding the unwound portion of the positive electrode material 31 and the negative electrode material 28 around the winding core 49. Then, the winding end side unstacked length β changes due to uneven thickness of the positive electrode active material 30 and the negative electrode active material 27, and as a result, the control unit 75 actually turns the defective electrode 56 into a defective electrode. It is considered that there is a case where the product is erroneously determined to be good.

Therefore, in the winding device 20, the negative electrode sensor 38 and the negative electrode cutter 39, and the positive electrode sensor 42
The positive electrode cutter 43 and the positive electrode cutter 43 are arranged in the vicinity of the core 49 arranged at the electrode material winding position.

Thus, the control unit 75 detects the winding end side unlaminated length β by using the unwound portions of the positive electrode material 31 and the negative electrode material 28 at a position as close as possible to the winding core 49. Even when the positive electrode active material 30 of the positive electrode material 31 and the negative electrode active material 27 of the negative electrode material 28 have uneven thickness, the unstacked length on the winding end side at the time when the wound electrode body 56 is formed. The change in the value β can be greatly reduced.

Further, in the winding device 20, the positive electrode material 3
From the point in time when the active material application end position 30B of No. 1 is detected until the active material non-applied region 29B reaches the cutting position,
The distance between the positive electrode sensor 42 and the positive electrode cutter 43 is selected so that the negative electrode sensor 38 can detect the active material application end position 27B of the negative electrode material 28.

Thus, the control section 75 detects the reference feed amount of the positive electrode material 31 and the feed amount of the winding end side of the negative electrode material 28 almost certainly, and calculates the unstacked length β of the winding end side. Have been made to gain.

Further, in the winding device 20, from the time when the active material application start position 27A (and the active material application end position 27B) of the negative electrode material 28 is detected, the winding core 49 is disposed at the electrode material winding position. From the point at which the feed amount of the negative electrode material 28 is sent and the active material application start position 30A (and the active material application end position 30B) of the positive electrode material 31 are detected, the positive electrode material extends from the core 49 disposed at the electrode material winding position. The sensor 42 for the positive electrode is set so that the feed amount of the positive electrode 31 is substantially equal to the feed amount.
By disposing the negative electrode sensor 38, in addition to the part that is laminated and wound on the core 49 of the positive electrode material 31 and the negative electrode material 28, the part that is not wound on the core 49 is also included. It can be assumed that they are stacked.

Accordingly, the control unit 75 calculates the winding end side unstacked length β almost exactly by subtracting the winding end side feeding amount of the negative electrode material 28 from the reference feeding amount of the positive electrode material 31. Thus, the negative electrode material 28 on the winding end side
The laminated state of the active material application region 26A of the positive electrode material 31 and the active material application region 26A of the positive electrode material 31 can be accurately inspected.

Here, the controller 75 checks the wound electrode body 56 described above with reference to FIGS.
1 is executed based on a wound electrode body inspection program stored in advance in a memory (not shown) provided in the inside of the unit 1.

That is, when the control section 75 starts sending the negative electrode material 28 and the positive electrode material 31 to the winding section 37 together with the first and second separators 32 and 33, the control section 75 executes the wound electrode body inspection program read from the memory. Based on the above, step S1 is performed in the spirally wound electrode body inspection processing procedure RT1 shown in FIG. 10 and FIG.
Enter from P1, and proceed to the following step SP2.

At step SP2, the control unit 75
Based on the photoelectric signal given from the negative electrode sensor 38,
The active material application start position 27A of the negative electrode material 28 sent to the winding portion 37 is detected, and the negative electrode rotary encoder 76 is detected at the timing when the active material application start position 27A is detected.
The detection of the feed amount of the negative electrode material 28 is started based on the pulse signal given from step (a), and the process proceeds to step SP3.

At step SP3, the control unit 75
Based on the photoelectric signal given from the positive electrode sensor 42,
The active material application start position 30A of the positive electrode material 31 sent to the winding portion 37 is detected, and the positive electrode counter is reset at the timing when the active material application start position 30A is detected, and the positive electrode rotary encoder 77 gives the counter. Based on the received pulse signal, the counter for the positive electrode starts counting up, and proceeds to step SP4.

Then, in step SP4, the control section 75 waits for the feed amount to reach the set feed amount while monitoring the feed amount of the negative electrode material 28 which has begun to be detected in step SP2. When it is detected that the feed amount has been sent to the winding unit 37 by the set feed amount, the detection of the feed amount of the negative electrode material 28 is stopped and the process proceeds to step SP5.

In step SP5, the control unit 75
Based on the count value of the positive electrode counter at the timing when the negative electrode material 28 is sent to the winding portion 37 by the set feed amount, the positive electrode material 31 is wound from the time when the active material application start position 30A of the positive electrode material 31 is detected. The winding start side feed amount sent to 37 is detected, and the routine proceeds to subsequent step SP6.

In step SP6, the control unit 75
By subtracting the winding start side feed amount of the positive electrode material 31 from the set feed amount of the negative electrode material 28, the winding start side unlaminated length α in the active material application region 26A of the negative electrode material 28 is calculated, and the process proceeds to step SP7. move on.

At step SP7, the control unit 75
Based on the photoelectric signal given from the positive electrode sensor 42,
The active material application end position 30B of the positive electrode material 31 sent to the winding part 37 is detected, and the positive electrode rotary encoder 77 is detected at the timing when the active material application end position 30B is detected.
The detection of the feed amount of the positive electrode material 31 is started based on the pulse signal given from step (1), and the process proceeds to step SP8.

At step SP8, the control unit 75
Based on the photoelectric signal given from the negative electrode sensor 38,
The active material application end position 27B of the negative electrode material 28 sent to the winding portion 37 is detected, and the negative electrode counter is reset again at the timing when the active material application end position 27B is detected. Based on the applied pulse signal, the counter for the negative electrode starts counting up, and proceeds to step SP9.

At step SP9, the control unit 75
While monitoring the feed amount of the positive electrode material 31 that has begun to be detected in step SP7, it waits for the active material non-applied region 29B of the positive electrode material 31 to reach the cutting position using the positive electrode cutter 43, and Active material uncoated area 2
When it is detected that 9B has reached the cutting position, the feed amount of the positive electrode material 31 at that time is stored as a reference feed amount, the detection of the feed amount of the positive electrode material 31 is stopped, and the process proceeds to step SP10.

In step SP10, the control unit 75
Is based on the count value of the negative electrode counter at the timing when the reference feed amount of the positive electrode material 31 is detected.
From the time when the active material application end position 27B of No. 8 is detected, the winding end side feed amount in which the negative electrode material 28 is sent to the winding portion 37 is detected, and the process proceeds to step SP11.

At step SP11, the control unit 75
Is calculated by subtracting the winding end side feed amount of the negative electrode material 28 from the reference feed amount of the positive electrode material 31 to calculate the winding end side unstacked length β in the active material application region 26A of the negative electrode material 28. Proceed to SP12.

At step SP12, the controller 75
Is that the winding start side unlaminated length α calculated in step SP6 is a length within the first specified range, and the winding end side unlaminated length β calculated in step SP11 is the second specified range. It is determined whether or not the length is within.

Here, in step SP12, obtaining a positive result means that the active material application region 29A of the positive electrode 81 is compared with the application start portion of the active material application region 26A of the negative electrode 80.
Of the active material application region 26A of the negative electrode 80 and the positive electrode 81
Means that the application end portion of the active material application region 29A is laminated as specified to form the spirally wound electrode body 56.

Therefore, the control unit 75 sets the step SP
If a positive result is obtained in step 12, step SP1
3 and determine that the wound electrode body 56 is non-defective, send an inspection result signal indicating the determination result to the subsequent device,
Proceeding to step SP14, the wound electrode body inspection processing procedure RT1 ends.

On the other hand, obtaining a negative result in step SP12 means that at least one of the winding start-side unstacked length α and the winding end-side unstacked length β corresponds to the first and the second. The length becomes outside the second specified range, and the negative electrode 8
The active material application region 29A of the positive electrode 81 is protruded and laminated outside the active material application region 26A of the positive electrode 81, or greatly enters the active material application region 26A of the negative electrode 80 beyond a specified range. This means that the wound electrode body 56 is formed by, for example, laminating the application regions 29A.

Therefore, the control unit 75 sets the step SP
If a negative result is obtained in step 12, step SP1
5 to determine that the wound electrode body 56 is defective, and automatically discharge the wound electrode body 56 being transported to a subsequent device by using a discharge mechanism, thereby determining that the wound electrode body 56 is non-defective. After transporting only the electrode body 56 to the subsequent device,
Proceeding to step SP14, the wound electrode body inspection processing procedure RT1 ends.

By the way, the control unit 75 always detects both the winding start side unstacked length α and the winding end side unstacked length β for the sequentially formed wound electrode body 56, Since the detection result is stored in the memory, the wound electrode body 56
Is determined to be defective, the winding start side unlaminated length α and the winding end side unlaminated length β are notified to the operator,
The running speed of the negative electrode material 28 and the positive electrode material 31 in the winding device 20 is appropriately adjusted so that the winding start portion and the winding end portion of the negative electrode material 28 and the positive electrode material 31 can be laminated as specified. Can be done.

In the above configuration, when the winding device 20 starts feeding the negative electrode material 28 and the positive electrode material 31 to the winding portion 37 together with the first and second separators 32 and 33,
The negative electrode material 2 is controlled by the control unit 75 using the negative electrode sensor 38.
8 starts to detect the feed amount of the negative electrode material 28 using the negative electrode rotary encoder 76 from the point of time when the active material application start position 27A is detected, and uses the positive electrode sensor 42 to detect the active material application start position 30A of the positive electrode material 31. From the time when the negative electrode material 2 is detected using the positive rotary encoder 77.
By the time when 8 is sent to the winding section 37 by the set feed amount, the winding start side feed amount in which the positive electrode material 31 is sent to the winding section 37 is detected, and the positive electrode material 31 is determined from the set feed amount of the negative electrode material 28 Is subtracted from the winding start side feed amount of the active material application region 26 of the negative electrode material 28.
A winding start side unlaminated length α in A is calculated.

In the winding device 20, the control unit 75 detects the active material application end position 30 B of the positive electrode material 31 using the positive electrode sensor 42 and uses the positive electrode rotary encoder 77 to detect the positive electrode material 31. While detecting the feed amount, the positive electrode material 31 was fed by the reference feed amount using the negative electrode rotary encoder 76 from the time when the active material application end position 27B of the negative electrode material 28 was detected using the negative electrode sensor 38. The winding end side feed amount in which the negative electrode material 28 has been sent to the winding portion 37 by the time is detected, and the winding end side feed amount of the negative electrode material 28 is subtracted from the reference feed amount of the positive electrode material 31 to obtain the negative electrode material 28. Of the winding end side unstacked length β in the active material application region 26A of the above is calculated.

In the winding device 20, the control section 75 compares the unlaminated length α on the winding start side with the first specified range and sets the unstacked length β on the winding end side in the second specified range. The laminated state of the negative electrode 80 and the positive electrode 81 of the spirally wound electrode body 56 formed at this time was inspected based on the comparison result obtained by comparison with the range.

Therefore, in the winding device 20, the first and second separators 32 and 33 can be used without unwinding the formed wound electrode body 56 and inspecting the laminated state of the negative electrode 80 and the positive electrode 81. At the same time, it is possible to inspect the laminated state of the negative electrode 80 and the positive electrode 81 while winding the negative electrode material 28 and the positive electrode material 31.

The winding device 20 inspects the state of lamination of the negative electrode 80 and the positive electrode 81 while winding the negative electrode material 28 and the positive electrode material 31 together with the first and second separators 32 and 33. Inspection is much simpler than when unwinding the wound electrode body 56 formed once and inspecting the laminated state of the negative electrode 80 and the positive electrode 81 as in a sampling inspection in the step of forming the wound electrode body 56. The stacked state of the negative electrode 80 and the positive electrode 81 can be easily inspected for all the spirally wound electrode bodies 56 formed sequentially.

Incidentally, according to the sampling inspection in the process of forming the conventional spirally wound electrode body 56, the negative electrode 80 is
Even if the wound electrode body 56 is formed without being laminated as specified, if the wound electrode body 56 is not a target of the sampling inspection, the wound electrode body 56 is sent to the subsequent step to be used for the non-aqueous electrolyte secondary battery. As a result, it is conceivable that a nonaqueous electrolyte secondary battery that is difficult to output a specified battery voltage is produced needlessly.

On the other hand, according to the winding device 20 of the present embodiment, of the wound electrode bodies 56 formed sequentially,
Based on the inspection result, the negative electrode 80 and the positive electrode 81 are laminated and formed as specified, and only the wound electrode body 56 determined to be non-defective is sent to the subsequent step. A non-aqueous electrolyte secondary battery can be manufactured by reliably using only the electrode body 56, and thus,
The inspection performed by the winding device 20 can significantly improve the yield in the subsequent process.

According to the above configuration, while the negative electrode material 28 and the positive electrode material 31 are being sent to the winding portion 37, the set feed amount detected with respect to the negative electrode material 28 and the set feed amount are detected based on the set feed amount. The winding start side unlaminated length α in the winding start portion of the negative electrode material 28 is calculated based on the winding start side feed amount of the positive electrode material 31, and the reference feed amount detected for the positive electrode material 31, The winding end side unstacked length β in the winding end portion of the negative electrode material 28 is calculated based on the winding end side feeding amount of the negative electrode material 28 detected based on the reference feed amount, and the winding start is started. Side unstacked length α and winding end side unstacked length β
Is compared with the corresponding first and second prescribed ranges.
By inspecting the state of lamination of the positive electrode 81 and the positive electrode 81, the laminated state of the negative electrode 80 and the positive electrode 81 of the resulting wound electrode body 56 can be easily formed while the negative electrode material 28 and the positive electrode material 31 are wound. Inspection can be performed, and thus, a winding device that can significantly improve the efficiency of forming a wound electrode body can be realized.

In the above-described embodiment, the control unit 75 executes the wound electrode body processing procedure RT1 described above with reference to FIGS. 10 and 11 to obtain the stacked state of the negative electrode 80 and the positive electrode 81 in the wound electrode body 56. However, the present invention is not limited to this, and the present invention is not limited to this. When the winding start side unlaminated length α is calculated, the active material application region 26A of the negative electrode material 28 and the positive electrode The state of lamination of the material 31 with the active material application area 29A is inspected. As a result, only when the unlaminated length α on the winding start side is within the first specified range, the unlaminated length on the winding end side is continuously measured Alternatively, the stacking state of the active material application region 26A of the negative electrode material 28 and the active material application region 29A of the positive electrode material 31 on the winding end side may be determined by calculating the value β. This makes it possible to simplify the inspection process for the wound electrode body 56 by the control unit 75 and reduce the processing load.

In the above embodiment, the laminated state of the active material application region 26A of the negative electrode material 28 on the winding start side and the active material application region 29A of the positive electrode material 31 and the negative electrode material Although the case where the stacked state of the active material application region 26A of the positive electrode material 31 and the active material application region 29A of the positive electrode material 31 are inspected has been described, the present invention is not limited to this. When 27 is applied with a prescribed thickness and a prescribed length, and the positive electrode active material 30 is applied with a prescribed thickness and a prescribed length in the positive electrode material 31, Active material application area 2 of negative electrode material 28 on winding start side
6A and the active material application area 29A of the positive electrode material 31 and the active material application area 2 of the negative electrode material 28 on the winding end side.
Either 6A or the laminated state of the active material application region 29A of the positive electrode material 31 may be inspected. The same effect as in the above-described embodiment can be obtained by such an inspection method.

Further, in the above-described embodiment, only the wound electrode body 56 determined to be good among the wound electrode bodies 56 formed sequentially from the winding device 20 is transported to the subsequent device. Although the case has been described, the present invention is not limited to this, and all the wound electrode bodies 56 formed from the winding device may be used.
And the corresponding inspection result signal may be sent to a subsequent device, and the subsequent device may selectively process the wound electrode body 56 determined to be a non-defective product. The turning device can be simply configured without the discharge mechanism.

Further, in the above-described embodiment, the case where the present invention is applied to the winding device 20 described above with reference to FIGS. 1 and 5 has been described. However, the present invention is not limited to this, and the present invention is not limited thereto. A negative electrode formed by applying a negative electrode active material to at least one surface of a predetermined portion of the current collector, and a positive electrode formed by applying a positive electrode active material to at least one surface of a predetermined portion of the positive electrode current collector As long as it is wound while being sequentially laminated, it can be widely applied to a winding device for winding a negative electrode and a positive electrode for a wound electrode body of various primary batteries and secondary batteries.

Further, in the above-described embodiment, the case where the winding portion 37 is applied as the winding means for winding the negative electrode and the positive electrode while sequentially laminating them is described. Not limited to this, as long as the negative electrode and the positive electrode can be wound while being sequentially laminated, a winding means having various other configurations, such as a winding part provided with one winding core, is widely applied. can do.

Further, in the above-described embodiment, the negative electrode sensor 38 and the control unit 75 are applied as the negative electrode application position detecting means for detecting the application start position of the negative electrode active material of the negative electrode sent to the winding means. However, the present invention is not limited to this. If the application start position of the negative electrode active material of the negative electrode sent to the winding means can be detected, the negative electrode having various other configurations can be used. The application position detecting means can be widely applied.

Further, in the above-described embodiment, the first negative electrode guide roller 35 serves as negative electrode feed amount detecting means for detecting the negative electrode feed amount based on the detected application start position of the negative electrode active material. Although the case where the negative rotary encoder 76 and the control unit 75 are applied has been described, the present invention is not limited to this, and the negative electrode feed amount may be set based on the detected application start position of the negative electrode active material. If it can be detected, the negative electrode feed amount detecting means having various other configurations can be widely applied.

Further, in the above-described embodiment, the positive electrode sensor 42 and the control unit 75 are applied as the positive electrode application position detecting means for detecting the application start position of the positive electrode active material of the positive electrode sent to the winding means. However, the present invention is not limited to this, and if it is possible to detect the application start position of the positive electrode active material of the positive electrode sent to the winding unit, the positive electrode having various other configurations can be detected. The application position detecting means can be widely applied.

Further, in the above-described embodiment, the first positive guide roller 40 is used as the positive feed amount detecting means for detecting the positive feed amount based on the detected application start position of the positive active material. Although the description has been given of the case where the rotary encoder 77 for positive electrode and the control unit 75 are applied, the present invention is not limited to this, and the feed amount of the positive electrode is set based on the detected application start position of the positive electrode active material. If it can be detected, the positive electrode feed amount detecting means having various other configurations can be widely applied.

Further, in the above-described embodiment, the application area of the negative electrode active material and the application area of the positive electrode active material on the winding start side are determined based on the detected feed amount of the negative electrode and the feed amount of the positive electrode. As inspection means for inspecting the lamination state of
Although the case where the control unit 75 is applied has been described, the present invention is not limited to this, and based on the detected feed amount of the negative electrode and the feed amount of the positive electrode, the negative electrode on the winding start side between the negative electrode and the positive electrode If it is possible to inspect the state of lamination between the application region of the active material for application and the application region of the positive electrode active material, inspection means having various other configurations can be widely applied.

[0131]

As described above, according to the present invention, the application start position of the negative electrode active material of the negative electrode sent to the winding means is detected, and the detected application start position of the negative electrode active material is used as a reference. The feed amount of the negative electrode is detected, the application start position of the positive electrode active material of the positive electrode sent to the winding means is detected, and the feed amount of the positive electrode is detected based on the detected application start position of the positive electrode active material. After that, based on the detected feed amount of the negative electrode and the feed amount of the positive electrode, the lamination state of the application region of the negative electrode active material and the application region of the positive electrode active material on the winding start side of the negative electrode and the positive electrode is inspected. By doing so, the winding of the wound electrode body formed by winding the negative electrode and the positive electrode, without winding the negative electrode and the positive electrode, for the negative electrode on the winding start side of the negative electrode and the positive electrode while winding the negative electrode and the positive electrode Active material application area and positive electrode active material application The lamination state of the frequency can be easily inspected, thus, the formation efficiency of the wound electrode body can be remarkably improved.

Further, the application end position of the negative electrode active material applied to the negative electrode sent to the winding means is detected, and the feed amount of the negative electrode is detected based on the detected application end position of the negative electrode active material. After detecting the application end position of the positive electrode active material of the positive electrode sent to the turning means, and detecting the feed amount of the positive electrode based on the detected application end position of the positive electrode active material, the detected negative electrode feed amount is detected. And based on the feed amount of the positive electrode, by checking the laminated state of the application region of the negative electrode active material and the application region of the positive electrode active material on the winding end side of the negative electrode and the positive electrode, the negative electrode and the positive electrode Without unwinding the wound electrode body formed by winding the negative electrode and the positive electrode, while applying the negative electrode active material application region and the positive electrode active material on the winding end side of the negative electrode and the positive electrode while winding the negative electrode and the positive electrode Easy lamination with the application area Can 査, thus, the formation efficiency of the wound electrode body can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing an embodiment of the configuration of a winding device according to the present invention.

FIG. 2 is a schematic sectional view showing a configuration of a negative electrode material.

FIG. 3 is a schematic sectional view showing a configuration of a positive electrode material.

FIG. 4 is a schematic perspective view showing a configuration of a wound electrode body.

FIG. 5 is a schematic perspective view showing the internal configuration of the winding device.

FIG. 6 is a schematic cross-sectional view for explaining the detection of the unlaminated length on the winding start side.

FIG. 7 is a schematic cross-sectional view for explaining the detection of the unstacked length on the winding end side.

FIG. 8 is a schematic cross-sectional view for describing a laminated state of a non-defective negative electrode and a positive electrode.

FIG. 9 is a schematic front view for explaining a set feed amount set for detecting the unstacked length on the winding start side.

FIG. 10 is a flowchart showing a procedure of a wound electrode body inspection process.

FIG. 11 is a flowchart illustrating a procedure of a wound electrode body inspection process.

FIG. 12 is a schematic sectional view showing a configuration of a non-aqueous electrolyte secondary battery.

[Explanation of symbols]

20 winding device, 26 current collector for negative electrode, 26A, 2
9A: Active material coated area, 26B, 29B: Active material non-coated area, 27: Negative electrode active material, 27A, 30A:
Active material application start position, 27B, 30B ... Active material application end position, 28 ... Negative electrode material, 29 ... Positive electrode current collector, 30
Active material for positive electrode, 31 Positive electrode material, 35 Guide roller for first negative electrode, 37 Rolled portion, 38 Sensor for negative electrode, 49, 50, 51 ... Core, 40 ... .., A first positive electrode guide roller, 42, a positive electrode sensor, 56, a wound electrode body, 75, a control unit, 76, a negative electrode rotary encoder, 77, a positive electrode rotary encoder, α
... unstacked length on winding start side, β ... unstacked length on winding end side, RT1 ... winding electrode body inspection processing procedure.

Claims (16)

[Claims] 1. A negative electrode formed by applying a negative electrode active material to a predetermined portion of at least one surface of a strip-shaped negative electrode current collector;
In a winding device for winding while sequentially laminating a positive electrode formed by applying a positive electrode active material on at least a predetermined portion of a belt-shaped positive electrode current collector, the negative electrode and the positive electrode are sequentially laminated. Winding means for winding while winding; negative electrode application position detecting means for detecting the application start position of the negative electrode active material of the negative electrode sent to the winding means; and Negative electrode feed amount detecting means for detecting the feed amount of the negative electrode based on the application start position; and positive electrode application position detecting means for detecting the application start position of the positive electrode active material of the positive electrode sent to the winding means And positive electrode feed amount detecting means for detecting the positive electrode feed amount based on the detected positive electrode active material application start position; and the detected negative electrode feed amount and positive electrode feed amount detected. On the basis of the, Winding apparatus characterized by comprising an inspection means for inspecting the laminated state of the application region and the positive electrode coating region of the active material of the negative electrode active material in round initiator. 2. The negative electrode application position detecting means detects an application end position of the negative electrode active material, and the negative electrode feed amount detecting means detects the detected application end position of the negative electrode active material. The feed amount of the negative electrode is detected on the basis of the reference, the application position detecting means for the positive electrode detects the application end position of the active material for the positive electrode, and the positive feed amount detecting means detects the active material for the positive electrode. The feed amount of the positive electrode is detected with reference to the end position of application of the substance, and the inspection unit is configured to detect the feed amount of the negative electrode and the feed amount of the positive electrode based on the detected feed amount of the negative electrode. The winding device according to claim 1, wherein a state of lamination between the application region of the active material for application and the application region of the positive electrode active material is inspected. 3. The negative electrode feed amount detecting means, based on the application start position of the negative electrode active material, sets a predetermined predetermined feed amount assumed to have started to be wound together with the positive electrode of the negative electrode. The positive electrode feed amount detecting means detects the positive electrode feed amount from the time when the application start position of the positive electrode active material is detected to the time when the negative electrode feed amount is detected. The winding device according to claim 1, wherein: 4. The negative electrode application position detecting means and the positive electrode application position detecting means determine a feed amount at which the negative electrode is sent to the winding means from the time when the application end position of the negative electrode active material is detected. 3. The method according to claim 2, wherein the positive electrode is arranged so that a feed amount of the positive electrode sent to the winding means is substantially equal from a time point at which the application end position of the positive electrode active material is detected. Winding device. 5. The winding device according to claim 4, wherein the application position detecting means for the negative electrode and the application position detecting means for the positive electrode are arranged near the winding means. 6. A negative electrode formed by applying a negative electrode active material to at least a predetermined portion of at least one surface of a strip-shaped negative electrode current collector;
In a winding device for winding while sequentially laminating a positive electrode formed by applying a positive electrode active material on at least a predetermined portion of a belt-shaped positive electrode current collector, the negative electrode and the positive electrode are sequentially laminated. A winding means for winding while winding; a negative electrode application position detecting means for detecting an application end position of the negative electrode active material of the negative electrode sent to the winding means; and Negative electrode feed amount detecting means for detecting the feed amount of the negative electrode based on the coating end position; and positive electrode coating position detecting means for detecting the coating end position of the positive electrode active material of the positive electrode sent to the winding means Positive electrode feed amount detecting means for detecting the positive electrode feed amount based on the detected positive electrode active material application end position; and the detected negative electrode feed amount and positive electrode feed amount detected. On the basis of the, Winding apparatus characterized by comprising an inspection means for inspecting the laminated state of the application region and the positive electrode coating region of the active material of the negative electrode active material in round ended side. 7. The feeding position detecting means for the negative electrode and the coating position detecting means for the positive electrode, wherein the negative electrode is sent to the winding means based on the detected end position of application of the negative electrode active material. The amount and the amount of the positive electrode sent to the winding means based on the detected end position of the application of the active material for the positive electrode are arranged so as to be substantially equal to each other. 7. The winding device according to 6. 8. The winding device according to claim 7, wherein the application position detecting means for the negative electrode and the application position detecting means for the positive electrode are arranged near the winding means. 9. A negative electrode formed by applying a negative electrode active material to a predetermined portion of at least one surface of a strip-shaped negative electrode current collector;
A winding method in which a positive electrode formed by applying a positive electrode active material to at least a predetermined portion of at least one surface of a belt-shaped positive electrode current collector is sequentially laminated and wound by a predetermined winding means. Detecting the application start position of the negative electrode active material of the negative electrode sent to the negative electrode, and detecting the feed amount on the winding start side of the negative electrode based on the detected application start position of the negative electrode active material. Detecting the application start position of the positive electrode active material of the positive electrode sent to the winding unit, and detecting the application start position of the positive electrode active material on the basis of the detected application start position on the winding start side of the positive electrode. A winding start side feed amount detecting step of detecting a feed amount, based on the detected feed amount of the negative electrode and feed amount of the positive electrode, based on the application area of the negative electrode active material on the winding start side and For positive electrode Winding method characterized by comprising a winding start-side inspection step of inspecting a laminated state of the coating region of the material. 10. A negative electrode active material application position of said negative electrode sent to said winding means is detected, and said negative electrode winding is performed based on said detected negative electrode active material application end position. While detecting the feed amount on the end side, detecting the application end position of the positive electrode active material of the positive electrode sent to the winding means, based on the detected application end position of the positive electrode active material. A winding end side feed amount detecting step of detecting a feed amount of the positive electrode on the winding end side; and, based on the detected negative electrode feed amount and the positive electrode feed amount, the winding end side on the winding end side. The winding method according to claim 9, further comprising a winding end side inspection step of inspecting a laminated state of the application region of the negative electrode active material and the application region of the positive electrode active material. 11. The winding start side feed amount detection step includes a step of detecting a predetermined amount of a predetermined amount of time that is assumed to have started to be wound together with the positive electrode of the negative electrode based on the application start position of the negative electrode active material. Detecting the feed amount and detecting the feed amount of the positive electrode from the time when the application start position of the positive electrode active material is detected to the time when the feed amount of the negative electrode is detected. Item 10. The winding method according to Item 9. 12. The winding end side feed amount detecting step includes: a feed amount at which the negative electrode is sent to the winding means from a time point when the application end position of the negative electrode active material is detected;
From the time when the application end position of the positive electrode active material is detected, the application end position of the negative electrode active material is detected at a predetermined position where the feed amount at which the positive electrode is sent to the winding means is substantially equal. 11. The winding method according to claim 10, wherein the application end position of the positive electrode active material is detected. 13. The winding end side feed amount detecting step includes detecting the coating end position of the negative electrode active material near the winding means and detecting the coating end position of the positive electrode active material. The winding method according to claim 12, wherein the winding is performed. 14. A negative electrode formed by applying a negative electrode active material to at least one predetermined portion of a strip-shaped negative electrode current collector, and a positive electrode active material formed by coating at least one surface of a strip-shaped positive electrode current collector. In a winding method in which a positive electrode formed by applying a substance is wound while being sequentially laminated by a predetermined winding means, a coating end position of the negative electrode active material applied to the negative electrode sent to the winding means is detected. And, while detecting the feed amount on the winding end side of the negative electrode based on the detected coating end position of the negative electrode active material, the positive electrode active material of the positive electrode sent to the winding means A winding end side feed amount detecting step of detecting a coating end position and detecting a feed amount of the positive electrode on the winding end side with reference to the detected coating end position of the positive electrode active material; Was negative above A winding end side inspection for inspecting a laminated state of the application region of the negative electrode active material and the application region of the positive electrode active material on the winding end side based on the feed amount of the positive electrode and the feed amount of the positive electrode. A winding method characterized by comprising steps. 15. The winding end side feed amount detecting step includes: a feed amount at which the negative electrode is sent to the winding means from a time point at which the application end position of the negative electrode active material is detected;
From the time when the application end position of the positive electrode active material is detected, the application end position of the negative electrode active material is detected at a predetermined position where the feed amount at which the positive electrode is sent to the winding means is substantially equal. 15. The winding method according to claim 14, wherein the application end position of the positive electrode active material is detected. 16. The winding end side feed amount detecting step detects the coating end position of the negative electrode active material near the winding means and detects the coating end position of the positive electrode active material. The winding method according to claim 15, wherein the winding is performed.