JP2017117685A - Wound body, winding device and method of manufacturing wound body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wound body or the like capable of strongly affixing a protection tape to an electrode sheet.SOLUTION: A battery element 1 includes two belt-like electrode sheets 4, 5 having an active material on the surface; and belt-like separator sheets 2, 3 which is made of an insulation raw material and make both electrode sheets 4, 5 brought into an insulation state. At the end of the electrode sheets 4,5, a hole-shaped or notch-shaped passing part 6 is formed penetrating through the front and the back of the electrode sheets 4, 5. Protection tapes 7 in a state adhered to each other through the passing part 6 is affixed to the front and back surfaces the end of the electrode sheets 4,5, respectively. Between the passing part 6 and the end edge of the electrode sheets 4,5, It is in a state where the electrode sheets 4,5 exist.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wound body incorporated in, for example, a secondary battery, a winding device for obtaining a wound body, and a method for manufacturing the wound body.

  For example, a wound body used as a secondary battery such as a lithium ion battery has two sheets of an insulating material, a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material. It is manufactured by being wound in a state of being overlapped via a separator sheet.

  In the winding device for manufacturing the wound body, each of the electrode sheets and the separator sheet supplied from the roll wound in a roll is transported to a winding unit along a separate transport path, It winds in the state in which the electrode sheet and the separator sheet were piled up in the said winding part. As a configuration of the winding unit, for example, a turret provided rotatably and a plurality of winding cores arranged at predetermined intervals along the rotation direction of the turret and also rotatably provided. What is provided is known (for example, refer patent document 1 etc.). Then, when winding of one wound body is almost completed by the winding unit, each electrode sheet and separator sheet are cut by a predetermined cutting means. Thereafter, the wound portion such as the electrode sheet is completely wound to obtain a wound body.

  By the way, there is a possibility that the separator sheet is damaged by burrs and edges generated at the cut portion of the electrode sheet, causing a short circuit. Moreover, in the cut part of an electrode sheet, there exists a possibility that an active material may peel off easily by the impact at the time of a cutting | disconnection, etc.

  Therefore, in recent years, a technique of attaching a pair of protective tapes from both the front and back surfaces of the cut portion after cutting the electrode sheet is known (for example, see Patent Document 2). In the technique, the cut electrode sheets are connected to each other with a protective tape, and the electrode sheet connected with the protective tape is supplied to the winding unit as a single strip. Then, the protective tape is cut when the winding by the winding unit is almost completed. As a result, in the obtained wound body, the end portion (cut portion) of the electrode sheet is covered with a protective tape.

JP-A-11-265726 JP 2012-56754 A

  However, since an active material exists on the surface of the electrode sheet, there is a possibility that the protective tape cannot be firmly attached to the electrode sheet. If the adhesive force of the protective tape on the electrode sheet is insufficient, when the force is applied to the protective tape during winding of the electrode sheet, the protective tape may be displaced from the electrode sheet or from the protective tape. As a result, the electrode sheet may come off, and as a result, the winding of the electrode sheet or the like may be hindered. Further, in the obtained wound body, the protective tape is liable to be displaced or peeled off, and the function of the protective tape for preventing damage to the separator sheet may not be sufficiently exhibited.

  The present invention has been made in view of the above circumstances, and its object is to provide a wound body, a winding device, and a method for manufacturing the wound body that can firmly adhere a protective tape to an electrode sheet. Is to provide.

  In the following, each means suitable for solving the above-described object will be described in terms of items. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. Two strip-shaped electrode sheets having an active material on the surface;
It is made of an insulating material, and includes a strip-shaped separator sheet for making both the electrode sheets in an insulating state,
A wound body in which the sheets are wound in a stacked state,
At the end of the electrode sheet, a hole-shaped or notched through-portion is formed which penetrates the front and back surfaces of the electrode sheet and between which the electrode sheet exists. Has been
A wound body in which protective tapes in a state of being bonded to each other through the through portions are respectively attached to both front and back surfaces of the end portion of the electrode sheet.

  According to the means 1, the through portion is formed at the end of the electrode sheet, and the electrode sheet exists between the through portion and the edge of the electrode sheet. Then, the protective tapes are bonded to each other through the through portion, and when a force is applied to the protective tape along the sheet longitudinal direction, the bonded portions of both protective tapes are caught on the electrode sheet. Thereby, it can suppress effectively that a protective tape peels from an electrode sheet, or a protective tape shifts | deviates with respect to an electrode sheet. As a result, the protective tape can be firmly attached to the electrode sheet, and the operational effects of providing the protective tape can be more reliably exhibited.

  The means 1 is particularly effective when it is difficult to firmly apply a protective tape to the electrode sheet, such as when the active material is easily peeled off from the surface of the electrode sheet.

  Mean 2. The wound body according to means 1, wherein the through portion has a hole shape surrounded by the electrode sheet.

  According to the said means 2, the adhesion part of both protection tapes will be in the state where the circumference | surroundings were enclosed with the electrode sheet. Therefore, peeling and shifting of the protective tape can be more effectively suppressed, and the protective tape can be more firmly attached to the electrode sheet.

Means 3. A winding device for winding and winding two strip-shaped electrode sheets having an active material on the surface and a strip-shaped separator sheet made of an insulating material while supplying each from a predetermined supply mechanism,
A core that rotates about its own central axis as a rotation axis, and that can wind each of the electrode sheets and the separator sheet supplied from the supply mechanisms;
An electrode sheet cutting means for cutting each electrode sheet at a position to be separated from a terminal portion to be wound by the winding core and a starting end portion to be wound next time by the winding core;
Of the electrode sheet, in the position where the electrode sheet exists between the cutting part or the scheduled cutting part of the electrode sheet by the electrode sheet cutting means, a hole shape or a notch shape penetrating the front and back of the electrode sheet Threading part forming means for forming a threading part;
Sheet cutting means for separating the upstream side portion and the downstream side portion of the cut portion of the electrode sheet after cutting the electrode sheet by the electrode sheet cutting means;
A state in which protective tape is applied to both the upstream side portion and the downstream side portion of the electrode sheet separated by the sheet separation means from the back and front surfaces of the electrode sheet, and the respective protective tapes are adhered to each other through the through portion. And a sheet connecting means for connecting the upstream portion and the downstream portion of the electrode tape by a tape portion at least a part of which the protective tape forms a winding device.

  According to the means 3, it is possible to easily manufacture a wound body that exhibits the same effects as the means 1.

  Further, according to the above means 3, since the protective tape can be firmly attached to the electrode sheet, when a force is applied to the protective tape or the electrode sheet during winding, the protective tape is displaced with respect to the electrode sheet. It is possible to more reliably prevent the electrode sheet from being removed from the protective tape. As a result, it is possible to effectively prevent the winding of the electrode sheet or the like from being hindered, and the productivity can be improved.

Means 4. The separator sheet and the electrode sheets are wound by a predetermined amount by the winding core, and the tape sheet and the separator sheet attached to the electrode sheets are stacked, At least one, and fixing means for fixing the separator sheet;
The winding device according to claim 3, further comprising: a sheet cutting unit that cuts each of the tape portions and the separator sheet that are stacked in a fixed state by the fixing unit at a time.

  According to the means 4, the separator sheet and both tape portions are cut at a time by the sheet cutting means. Therefore, the length of the surplus portion (the portion not covering the electrode sheet) at the end of the separator sheet is approximately the same as the length from the cut portion of the tape portion to the edge of the electrode sheet near the cut portion. Become. Therefore, the separator sheet can be wound to some extent after cutting the tape portion, and then the amount of separator sheet used can be reduced compared with the case of cutting the separator sheet, thereby reducing the manufacturing cost and the size of the wound body. Can be achieved.

  Furthermore, since each tape part and the separator sheet are cut at once in a state of being overlapped, the respective edge parts (cut parts) of each tape part and the separator sheet are aligned to some extent immediately after cutting. Therefore, if the wound body obtained by the manufacturing method of the means 4 is one in which the electrode sheet or the separator sheet is wound normally, the end portion of each tape part and the separator sheet is at the terminal part. It can be confirmed visually. For example, when winding the electrode sheet and the end of the separator sheet after cutting the tape part and the separator sheet, the tape part attached to each electrode sheet and the edge of the separator sheet are slightly shifted, It will appear on the outer periphery of the wound body. Therefore, the quality of the wound state of the electrode sheet or the separator sheet in the wound body can be easily determined by visually confirming the terminal portion of the wound body.

  Further, if the respective edge portions of each tape portion and the separator sheet are slightly shifted, when the winding is stopped with a predetermined fixing tape, at least the adhesive surface of the fixing tape is attached to each tape. It is possible to more reliably contact the part and the separator sheet (in some cases, the adhesive surface of the tape can also be more reliably contacted to the electrode sheet). As a result, the winding of the wound body can be performed more reliably and firmly.

  In addition, the above-mentioned effect that the protective tape is firmly attached to the electrode sheet, which is exhibited by providing the through portion, also works effectively in terms of firmly winding with the fixing tape.

Means 5. The electrode sheet is configured such that a positive electrode sheet having a positive electrode active material on the surface and a negative electrode sheet having a negative electrode active material on the surface are wound by the core.
When the protective tape is applied by the sheet connecting means, the gap between the upstream portion and the downstream portion of the positive electrode sheet is more than the gap between the upstream portion and the downstream portion of the negative electrode sheet. The winding device according to claim 3 or 4, wherein the winding device is configured to be larger.

  According to the said means 5, it can be set as the structure which covers a positive electrode sheet with a negative electrode sheet more reliably in the obtained winding body. Accordingly, it is possible to effectively suppress problems associated with the positive electrode sheet not being covered with the negative electrode sheet (for example, needle-like precipitates are formed on the positive electrode sheet and the separator sheet is damaged). Can do. As a result, the quality of the wound body can be further improved.

  In addition, the above effect is not limited if the negative electrode sheet is positioned on the outer peripheral side of the positive electrode sheet, but the upstream side of the negative electrode sheet even if the negative electrode sheet is positioned on the inner peripheral side of the positive electrode sheet. If there is a predetermined difference or more between the gap formed between the portion and the downstream portion and the gap formed between the upstream portion and the downstream portion of the positive electrode sheet, it is sufficiently produced. It becomes.

Means 6. A tape position detecting means provided downstream of the electrode sheet cutting means and the sheet connecting means along the conveying path of each electrode sheet, and detecting the position of the tape portion;
Based on the detection result by the tape position detecting means, a sheet length measuring means for measuring the length of the electrode sheet from the position of the tape portion to the position of the next tape portion,
The supply length adjusting means capable of adjusting the length of the electrode sheet supplied from the supply mechanism based on a measurement result by the sheet length measuring means. Winding device.

  The tape position detecting means may detect the position of the tape portion directly from the tape portion itself or indirectly. For example, the tape position detecting means may detect the position of the tape portion by detecting the upstream edge (starting edge) or the downstream edge (ending edge) of the electrode sheet for one element, or for one element. The position of the tape portion may be detected by detecting a gap formed between the electrode sheets.

  According to the means 6, the length of the electrode sheet for one element that is actually supplied can be measured by using the position of the tape portion. The supply length adjusting means can adjust the length of the electrode sheet supplied from the supply mechanism based on the measured length of the electrode sheet. For example, when the length of the electrode sheet for one element measured by the sheet length measuring unit is 5 mm longer than the normal length, the supply length adjusting unit sets the length of the electrode sheet supplied from the supply mechanism to the current length. It shall be 5 mm smaller than the set value. Thereby, the length of the electrode sheet in the obtained winding body can be made more appropriate, and the quality of the winding body can be further improved.

  Further, according to the means 6, it is possible to more reliably prevent a large shift in the position of each tape part along the transport direction when the tape part is cut by the sheet cutting means. Thereby, each tape part can be more reliably piled up at the time of a cutting | disconnection of a tape part etc., and each tape part and a separator sheet can be more reliably cut | disconnected at once by a sheet cutting means. As a result, the productivity can be further improved.

Means 7. A tape disposing means for disposing a predetermined connecting tape between the upstream portion and the downstream portion of the electrode sheet separated by the sheet separating means;
The sheet connecting means includes the protection on both the front and back surfaces of the upstream portion of the electrode sheet and one end portion of the connecting tape, and the back and front surfaces of the downstream portion of the electrode sheet and the other end portion of the connecting tape. Means 3 to 6 characterized in that a tape is affixed and the upstream portion and the downstream portion of the electrode sheet are connected by the tape portion having the protective tape and the connecting tape. The winding device according to any one of the above.

  For example, in the wound body, when a requirement such as a difference in length between the electrodes is a certain size or more is required, in order to satisfy this requirement, the upstream portion and the downstream portion of the electrode sheet It may be necessary to connect the upstream portion and the downstream portion of the electrode sheet by the tape portion with a relatively large gap therebetween. In such a case, if the upstream part and the downstream part of the electrode sheet are connected only by two protective tapes attached to the back and front of the electrode sheet, the comparatively thick part where the protective tape overlaps is compared. It will be formed long. Therefore, there exists a possibility that the outer diameter in the obtained winding body may become a comparatively big thing. In addition, there is a concern that air bubbles are likely to be generated between the protective tapes, leading to deterioration of the quality of the wound body.

  In this respect, according to the means 7, the upstream portion and the downstream portion of the electrode sheet are connected through one connecting tape, so that the portion where the protective tape overlaps can be made relatively short. . Therefore, the relatively thick part where the protective tape overlaps between the upstream part and the downstream part of the electrode sheet can be made shorter. Thereby, the outer diameter in the obtained winding body can be made comparatively small, and size reduction of a winding body can be achieved. Moreover, since the overlapping part of a protective tape becomes short, as a result, generation | occurrence | production of the bubble between both protective tapes can be suppressed. Thereby, the quality fall of a winding body can be suppressed effectively.

  Means 8. Any one of means 3 to 7, wherein the electrode sheet is cut by the electrode sheet cutting means and the through part is formed by the through part forming means at a time. A winding device according to claim 1.

  According to the means 8, since the cutting of the electrode sheet and the formation of the through portion are performed at a time, the productivity can be further improved.

Means 9. Using a winding device having a winding core that can rotate about its central axis as a rotation axis, two strip-shaped electrode sheets having an active material on the surface and a strip-shaped separator sheet made of an insulating material A method of manufacturing a wound body for manufacturing a wound body that is rotated,
An electrode sheet cutting step for cutting each of the electrode sheets;
Of the electrode sheet, in the position where the electrode sheet exists between the cutting part or the scheduled cutting part of the electrode sheet in the electrode sheet cutting step, a hole shape or a notch shape penetrating the front and back of the electrode sheet A threading part forming step of forming a threading part;
After the cutting of the electrode sheet in the electrode sheet cutting step, a sheet separating step of separating the upstream portion and the downstream portion of the cut portion in the electrode sheet;
A state in which a protective tape is applied to each of the upstream side portion and the downstream side portion of the electrode sheet separated in the sheet separation step from the front and back surfaces of the electrode sheet, and the protective tape is adhered to each other through the through portion. And a sheet connecting step of connecting the upstream portion and the downstream portion of the electrode tape by a tape portion at least a part of which the protective tape constitutes a wound body manufacturing method.

  According to the means 9, the same effect as that of the means 3 is achieved.

Means 10. Winding each electrode sheet and the separator sheet with respect to the core, and winding the tape part and the separator sheet attached to each electrode sheet; and
In a state where each of the tape portions and the separator sheet are overlapped, at least one of the electrode sheet and the tape portion, and a fixing step of fixing the separator sheet,
The method for producing a wound body according to means 9, characterized in that, in the fixing state in the fixing step, the sheet cutting step of cutting the tape portions and the separator sheet in a stacked state at a time.

  According to the means 10, the same operational effects as the means 4 are achieved.

Means 11. The winding device is
A plurality of the cores;
A turret that is rotatable about its own central axis as a rotation axis, and has a plurality of winding cores arranged at predetermined intervals in its rotation direction;
Each core has a slit through which the electrode sheet and the separator sheet can be inserted;
After winding each electrode sheet and the separator sheet for a predetermined length with respect to the first core in the first position among the plurality of cores, the turret is rotated, and the first core is moved to the second position. A core moving step for moving the second core different from the first core to the first position,
The electrode sheet and the separator sheet arranged from the first core positioned at the second position to the respective supply sources of the electrode sheet and the separator sheet are positioned at the second position. A slit insertion step for inserting the slit into the slit of the core;
After the separator sheet and each tape portion are cut in the sheet cutting step, a termination portion winding step of winding the termination portion of the separator sheet and the termination portion of each electrode sheet by the first core. Including
In the winding step, after the insertion of the electrode sheets and the separator sheet into the slits of the second core in the slit insertion step, the electrode sheets by the first core located at the second position And by winding the separator sheet, the tape portions connecting the electrode sheets are arranged between the first core and the second core in a state of overlapping each other,
In the fixing step, at least one of the electrode sheet and the tape portion, and the separator in the slit of the second core in a state where the tape portions and the separator sheet are overlapped with each other. Secure the seat,
In the sheet cutting step, in the slit of the second core, at least one of the electrode sheet and the tape portion, and the separator sheet is fixed, and the first core is moved from the first core. The method for manufacturing a wound body according to the means 9 or 10, wherein the separator sheet and each tape portion arranged over a two-core are cut at a time.

  The phrase “disposing each tape portion between the first core and the second core” includes a state in which each tape portion is disposed in the slit of the second core.

  According to the means 11, the winding device includes a plurality of cores, and in the core moving step, each electrode sheet and separator sheet are wound to some extent with respect to the first core at the first position. The first winding core moves to the second position, and the second winding core moves to the first position. And in a slit insertion process, each electrode sheet and separator sheet distribute | arranged from the 1st core to each supply source of an electrode sheet and a separator sheet are penetrated with respect to the slit of a 2nd core.

  Next, in the winding step, each electrode sheet and separator sheet are wound by the first winding core, so that the tape portions are arranged at predetermined positions between the first winding core and the second winding core in a state where they overlap each other. The In this state, in the fixing step, at least one of the electrode sheet and the tape portion attached to the electrode sheet and the separator sheet is fixed in the slit of the second core. Next, in the sheet cutting step, the separator sheet and each tape portion are cut at a time with the electrode sheet and the separator sheet fixed in the slit of the second core. After the cutting, the terminal portion of the electrode sheet or the separator sheet is wound by the first core in the terminal portion winding step.

  Thus, according to the means 11, the separator sheet and the like are fixed by the fixing means of the second core when the separator sheet and each tape part are cut. Therefore, winding of the separator sheet and the electrode sheet can be started by the second winding core immediately after cutting the separator sheet and each tape portion (immediately after the sheet cutting step). Thereby, the productivity can be further improved.

Means 12. The electrode sheet is configured such that a positive electrode sheet having a positive electrode active material on the surface and a negative electrode sheet having a negative electrode active material on the surface are wound by the core.
The gap between the upstream portion and the downstream portion of the positive electrode sheet is larger than the gap between the upstream portion and the downstream portion of the negative electrode sheet when the protective tape is applied in the sheet connecting step. The method for producing a wound body according to any one of means 9 to 11, wherein the winding body is also enlarged.

  According to the means 12, the same operational effects as those of the means 5 are achieved.

Means 13. The tape portion is located between an upstream portion and a downstream portion of the electrode sheet, and a single connecting tape connected to the upstream portion and the downstream portion of the electrode sheet by the protective tape. Prepared,
In the sheet connecting step, the upstream side portion of the electrode sheet and the back and front surfaces of one end portion of the connecting tape, and the downstream side portion of the electrode sheet and the back and front surfaces of the other end portion of the connecting tape, respectively. The protective tape is affixed, and the upstream portion and the downstream portion of the electrode sheet are connected by the tape portion including the protective tape and the connection tape. A method of manufacturing a wound body.

  According to the means 13, the same effect as that of the means 7 is achieved.

  Means 14. The winding body according to any one of means 9 to 13, wherein the cutting of the electrode sheet in the electrode sheet cutting step and the formation of the threading portion in the threading portion forming step are performed at once. Method.

  According to the means 14, the same effect as that of the means 8 is achieved.

It is a perspective schematic diagram which shows the structure of a battery element. It is a schematic diagram which shows the edge part etc. of the electrode sheet which comprises a battery element. It is a schematic block diagram of a winding apparatus. It is a schematic block diagram of a winding part. It is a schematic block diagram of a winding core. It is a schematic diagram which shows the structure of a cutting sticking apparatus. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus at the time of sheet | seat cutting. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus after sheet | seat cutting | disconnection. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus at the time of tape sticking. It is a schematic diagram for demonstrating a motion of the cutting sticking apparatus after the cutting | disconnection of a negative electrode sheet. It is a schematic diagram of the positive electrode sheet for showing a delimitation position etc. It is a cross-sectional schematic diagram which shows the state which separated the upstream part and downstream part of the positive electrode sheet. It is a perspective schematic diagram which shows the sticking process of a protective tape. It is a cross-sectional schematic diagram which shows the positive electrode sheet | seat etc. after masking tape sticking. It is a cross-sectional schematic diagram which shows the state which spaced apart the upstream part and the downstream part of the negative electrode sheet. It is a cross-sectional schematic diagram which shows the negative electrode sheet etc. after masking tape sticking. It is operation | movement explanatory drawing of the winding apparatus which shows the state in which various sheets are wound with respect to the winding core in a winding position. It is operation | movement explanatory drawing of the winding apparatus which shows the state which one winding core moves to a removal position, winding various sheets, and the other empty winding core moves to a winding position. It is operation | movement explanatory drawing of the winding apparatus which shows the state which penetrated various sheets with respect to the slit of the empty winding core which moved to the winding position. It is operation | movement explanatory drawing of the winding apparatus which shows the state which rotates the winding core located in a removal position, and winds various sheets. It is operation | movement explanatory drawing of the winding apparatus which shows the state which has arrange | positioned the protection tape in the predetermined position. It is operation | movement explanatory drawing of the winding apparatus which shows the state which cut | disconnects each protection tape and a separator sheet. It is operation | movement explanatory drawing of the winding apparatus which shows the state which wound up the separator sheet and the terminal part of an electrode sheet with the winding core of a removal position, and started winding of various new sheets with the winding core of the winding position. . It is an expanded sectional perspective view for showing the stop state of terminal parts, such as a separator sheet. It is a schematic block diagram of the winding apparatus in 2nd Embodiment. It is a schematic block diagram which shows structures, such as a winding core in 2nd Embodiment. It is a mimetic diagram for showing a winding process in a 2nd embodiment. It is a mimetic diagram for showing a sheet cutting process in a 2nd embodiment. It is a schematic diagram for showing the winding process of terminal parts, such as a separator sheet, in a 2nd embodiment. It is a cross-sectional schematic diagram for showing the insertion process of the separator sheet etc. with respect to the slit in 2nd Embodiment. In 3rd Embodiment, it is a cross-sectional schematic diagram which shows the state which spaced apart the upstream part and downstream part of the positive electrode sheet. It is a perspective schematic diagram which shows the sticking process of the protective tape in 3rd Embodiment. In 3rd Embodiment, it is a cross-sectional schematic diagram which shows the positive electrode sheet | seat etc. which were connected with the protective tape and the connection tape. In 3rd Embodiment, it is a cross-sectional schematic diagram which shows the state which spaced apart the upstream part and downstream part of the negative electrode sheet. In 3rd Embodiment, it is a cross-sectional schematic diagram which shows the negative electrode sheet etc. which were connected with the protective tape and the tape for connection. It is a schematic diagram which shows the structure of the cutting sticking apparatus in 3rd Embodiment. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus at the time of sheet cutting in 3rd Embodiment. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus after the sheet | seat cutting | disconnection in 3rd Embodiment. It is a schematic diagram which shows the cutting and sticking apparatus at the time of arrangement | positioning of the tape for connection in 3rd Embodiment. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus at the time of sticking of the protective tape in 3rd Embodiment. It is a schematic diagram for demonstrating the motion of the cutting sticking apparatus after the cutting | disconnection of the negative electrode sheet in 3rd Embodiment. It is operation | movement explanatory drawing of the winding apparatus which shows the state on which the protective tape etc. were piled up. It is an expanded sectional schematic diagram which shows the sheet cutter etc. at the time of cutting | disconnection of a connection tape. It is a plane schematic diagram of the electrode sheet which shows the structure of the through part in another embodiment. It is a plane schematic diagram of the electrode sheet which shows the structure of the through part in another embodiment. It is a plane schematic diagram of the electrode sheet which shows the structure of the through part in another embodiment. It is a plane schematic diagram of the electrode sheet for demonstrating the formation method of the penetration part in another embodiment. It is a plane schematic diagram of the electrode sheet which shows the structure of the through part in another embodiment. It is a plane schematic diagram of the electrode sheet which shows the structure of the through part in another embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
[First Embodiment]
First, the configuration of a lithium ion battery element as a wound body obtained by the winding device of the present embodiment will be described.

  As shown in FIGS. 1 and 2, a lithium ion battery element 1 (hereinafter simply referred to as “battery element 1”) includes a positive electrode sheet 4 and a negative electrode sheet 5 via two separator sheets 2 and 3. Manufactured by winding in a superposed state. In FIG. 2, for convenience of explanation, the separator sheets 2 and 3 and the electrode sheets 4 and 5 (hereinafter collectively referred to as “various sheets 2 to 5”) are shown with a space therebetween. .

  Separator sheets 2 and 3 are in the form of strips having the same width. In order to prevent different electrode sheets 4 and 5 from contacting each other and causing a short circuit, an insulator such as polypropylene (PP) is used. It is comprised by.

  Each of the electrode sheets 4 and 5 includes a thin metal sheet and has substantially the same width as the separator sheets 2 and 3. Moreover, the active material is apply | coated to the front and back both surfaces of the said metal sheet in each electrode sheet 4 and 5. FIG. For example, an aluminum foil sheet is used as the positive electrode sheet 4, and a positive electrode active material (for example, lithium manganate particles) is applied to both the front and back surfaces. For example, a copper foil sheet is used for the negative electrode sheet 5, and a negative electrode active material (for example, activated carbon or the like) is applied to both the front and back surfaces. And ion exchange between the positive electrode sheet 4 and the negative electrode sheet 5 can be performed through the active material. More specifically, ions move from the positive electrode sheet 4 side to the negative electrode sheet 5 side during charging, and ions move from the negative electrode sheet 5 side to the positive electrode sheet 4 side during discharging.

  In addition, through portions 6 are formed at both ends of both electrode sheets 4 and 5 (FIG. 2 also shows an enlarged view of only the end portions of electrode sheets 4 and 5). In the present embodiment, a plurality of the through portions 6 are provided side by side in the sheet width direction (see FIG. 13), and each of the through portions 6 has a circular hole shape penetrating the electrode sheets 4 and 5. And the protective tape 7 as a tape part is affixed with respect to the front and back both surfaces of the electrode sheets 4 and 5 corresponding to the formation position of the through part 6 among the electrode sheets 4 and 5. The protective tape 7 is made of polypropylene or the like and has substantially the same width as the electrode sheets 4 and 5. The protective tape 7 affixed to the front surfaces of the electrode sheets 4 and 5 and the protective tape 7 affixed to the back surfaces of the electrode sheets 4 and 5 are in a state of being bonded to each other through the through portion 6.

  A plurality of positive leads (not shown) extend from one edge of the positive electrode sheet 4 in the width direction, and a plurality of negative leads (not shown) extend from the other edge of the negative electrode sheet 5 in the width direction.

  In obtaining a lithium ion battery, the wound battery element 1 is disposed in a metallic battery container (not shown), and the positive electrode lead and the negative electrode lead are combined. Then, the combined positive lead is connected to a positive terminal component (not shown), and the same negative lead is connected to a negative terminal component (not shown), and both terminal components are open at both ends of the battery container. The lithium ion battery can be obtained by being provided so as to be closed.

  Next, the winding device 10 for manufacturing the battery element 1 will be described. As shown in FIG. 3, the winding device 10 includes a winding unit 11 for winding various sheets 2 to 5, and a positive electrode sheet supply mechanism 31 for supplying the positive electrode sheet 4 to the winding unit 11. A negative electrode sheet supply mechanism 41 for supplying the negative electrode sheet 5 to the winding unit 11, and separator supply mechanisms 51 and 61 for supplying the separator sheets 2 and 3 to the winding unit 11, respectively. Yes. The various mechanisms in the winding device 10 such as the winding unit 11 and the supply mechanisms 31, 41, 51, 61 are basically configured to be controlled by a control device (not shown).

  On the most upstream side of the positive electrode sheet supply mechanism 31, a positive electrode sheet raw material 32 formed by winding the positive electrode sheet 4 in a roll shape is rotatably supported. It will be pulled out.

  Further, in the middle of the transport path of the positive electrode sheet 4 from the positive electrode sheet fabric 32 to the winding part 11, a detection sensor 83, a first feeding roller 84, and a buffer mechanism are sequentially arranged from the downstream side. 85, a second feeding roller 86, and a cutting and sticking device 87 are provided.

  The detection sensor 83 is composed of, for example, a photoelectric sensor, and detects the protective tape 7 attached to the positive electrode sheet 4. The detection sensor 83 irradiates light toward the positive electrode sheet 4 and directly detects the protective tape 7 based on the difference in reflected light. When the protective tape 7 is detected, a signal indicating that the protective tape 7 has been detected is output from the detection sensor 83 to a predetermined calculation control device 89.

  The calculation control device 89 is constituted by, for example, a computer system including a CPU, a RAM, and the like. Every time a signal is input from the detection sensor 83, the calculation control device 89 acquires the amount of rotation of an encoder provided on a length measuring roller 85a, which will be described later, from when the signal was input immediately before. Then, based on the obtained rotation amount, the distance from the position where the protective tape 7 is applied to the position where the next protective tape 7 is applied, that is, a positive value corresponding to one battery element which is actually wound by the winding unit 11. The length of the electrode sheet 4 is calculated. In the present embodiment, a sheet length measuring unit is configured by the calculation control device 89 and the length measuring roller 85a.

  The calculation control device 89 records in advance a set value related to the length of the positive electrode sheet 4 for one battery element, and controls the operation of the second feeding roller 86 based on the set value. More specifically, the calculation control device 89 sequentially receives data related to the length of the positive electrode sheet 4 fed from the second feeding roller 86 based on an encoder (not shown) provided on the second feeding roller 86. Thus, when the feed amount of the positive electrode sheet 4 grasped based on the received data becomes equal to the set value, the operation of the second feed roller 86 is stopped.

  In addition, the calculation control device 89 is capable of sequentially updating the set value, and sets a new set value based on the difference between the length of the positive electrode sheet 4 actually supplied (calculated) and the set value. Derived and updated. For example, when the length of the positive electrode sheet 4 actually supplied (calculated) is 5 mm longer than the set value, the calculation control device 89 sets the new set value to be greater than the current set value. Update to a value shorter by 5 mm. As a result, the length of the positive electrode sheet 4 supplied next time is 5 mm shorter than the previous supply length. In the present embodiment, the supply control unit 89 and the second feeding roller 86 constitute supply length adjusting means.

  The first feeding roller 84 has a pair of upper and lower rollers 84a and 84b connected to a motor (not shown). The positive electrode sheet 4 is sandwiched between the rollers 84a and 84b, and the winding operation of the winding unit 11 is performed. The positive electrode sheet 4 is fed out.

  On the other hand, the second feeding roller 86 is used for positioning the planned application position of the protective tape 7 on the positive electrode sheet 4 with respect to the cutting and pasting device 87 while feeding the positive electrode sheet 4, and is connected to a motor (not shown). And a pair of upper and lower rollers 86a, 86b and an encoder (not shown). The second feeding roller 86 is configured to intermittently feed out the positive electrode sheet 4 based on control from the calculation control device 89 while holding the positive electrode sheet 4 between the rollers 86a and 86b.

  The buffer mechanism 85 includes a length measuring roller 85a having an encoder (not shown), a driven roller 85b, and a lifting roller 85c provided so as to be vertically displaceable between both rollers 85a and 85b. It plays a role of absorbing the difference between the feeding amount of the positive electrode sheet 4 and the feeding amount of the positive electrode sheet 4 by the second feeding roller 86. The buffer mechanism 85 also functions as tension applying means for applying a predetermined tension to the wound positive electrode sheet 4 and preventing the positive electrode sheet 4 from slackening.

  The cutting and sticking device 87 is for cutting the positive electrode sheet 4 and sticking the protective tape 7, and as shown in FIG. 6 and the like, a cutter mechanism as an electrode sheet cutting means for cutting the positive electrode sheet 4 90, a gripping mechanism 91 as a sheet separating means for gripping the positive electrode sheet 4, a tape applying mechanism 92 as a tape connecting means for attaching the protective tape 7 to a cut portion of the positive electrode sheet 4, and a through portion 6 Is provided with a punching mechanism 93 as a through portion forming means.

  The cutter mechanism 90 includes an upper blade 90a positioned on the upper side of the positive electrode sheet 4 and a lower blade 90b positioned on the lower side of the positive electrode sheet 4, and each of the blades 90a and 90b is the positive electrode sheet 4. It is comprised so that it can evacuate out of the conveyance path | route.

  The gripping mechanism 91 grips the positive electrode sheet 4 when the cutter mechanism 90 cuts the positive electrode sheet 4 and the punching mechanism 93 forms the through portion 6. The gripping mechanism 91 includes an upstream gripping portion 91a that can grip the positive electrode sheet 4 on the upstream side of the cutter mechanism 90, and a downstream gripping portion 91b that can grip the positive electrode sheet 4 on the downstream side of the cutter mechanism 90. have. Further, the upstream gripping portion 91a is configured to be able to advance and retract along the conveyance path of the positive electrode sheet 4 with respect to the downstream gripping portion 91b.

  More specifically, the upstream gripping portion 91a can be moved between a retracted position spaced a considerable distance from the downstream gripping portion 91b and a closest approach position closest to the downstream gripping portion 91b by a driving means (not shown). It is configured. That is, each grip part 91a, 91b is comprised so that relative movement is possible in the direction which mutually spaces apart and approaches along a sheet conveyance direction. In addition, although a code | symbol is abbreviate | omitted for convenience, each holding | grip part 91a, 91b is equipped with a pair of upper and lower chucks, and the said chuck | zipper is comprised so that the said opening / closing operation | movement may be performed by the drive means which is not shown in figure.

  The tape applying mechanism 92 includes an upper holding portion 92a that can hold the protective tape 7 at a position above the positive electrode sheet 4, and a lower holding portion 92b that can hold the protective tape 7 at a position below the positive electrode sheet 4. The holding portions 92a and 92b are configured to move up and down along the vertical direction by driving means (not shown).

  One punching mechanism 93 is provided on each of the upstream and downstream sides of the cutter mechanism 90. The punching mechanism 93 is positioned on the upper side of the positive electrode sheet 4 and has a punching blade 93a having a shape corresponding to the through portion 6; And a receiving portion 93b located on the lower side of the electrode sheet 4. The punching blade 93a and the receiving portion 93b can be moved up and down by driving means (not shown), and the positive electrode sheet 4 is punched by the punching blade 93a so that the through portion 6 is formed. Yes. Further, the punching blade 93 a and the receiving portion 93 b are configured to be retractable outside the conveyance path of the positive electrode sheet 4.

  Returning to the description of FIG. 3, on the most upstream side of the negative electrode sheet supply mechanism 41, a negative electrode sheet original fabric 42 in which the negative electrode sheet 5 is wound in a roll shape is rotatably supported. The negative electrode sheet 5 will be pulled out as appropriate.

  Further, in the middle of the transport path of the negative electrode sheet 5 from the negative electrode sheet original fabric 42 to the winding portion 11, similarly to the transport path of the positive electrode sheet 4, the detection sensor 83, the first feeding roller 84, and the buffer mechanism. 85, a second feeding roller 86, a cutting and sticking device 87, a calculation control device 89, and the like. Various configurations such as the detection sensor 83, the first feeding roller 84, the buffer mechanism 85, the second feeding roller 86, the cutting and sticking device 87, and the calculation control device 89 are the same as those provided in the conveyance path of the positive electrode sheet 4. Therefore, detailed description thereof is omitted. In the present embodiment, one calculation control device 89 is provided for each of the conveyance paths of the electrode sheets 4 and 5, but only one calculation control device 89 is provided, and the calculation control device 89 is provided. The supply amount of each electrode sheet 4, 5 may be adjusted by 89.

  On the other hand, the separator supply mechanisms 51 and 61 are provided with separator webs 52 and 62, respectively, in which separator sheets 2 and 3 are wound in a roll shape.

  The separator webs 52 and 62 are supported so as to be freely rotatable, and the separator sheets 2 and 3 are appropriately pulled out from here.

  Further, various guide rollers (reference numerals omitted) for guiding the various sheets 2 to 5 such as a pair of guide rollers 88 a and 88 b that collectively collect the various sheets 2 to 5 are provided in the supply path of the various sheets 2 to 5. Is provided.

  In this embodiment, when the separator sheets 2 and 3 and the two electrode sheets 4 and 5 pass through the guide rollers 88a and 88b, the protective tape is applied to the positive electrode sheet 4. 7 and the length of the conveyance path of the electrode sheets 4 and 5 are set so that the protective tape 7 attached to the negative electrode sheet 5 overlaps.

  Next, the configuration of the winding unit 11 will be described in detail. As shown in FIG. 4, the winding unit 11 includes a disc-shaped turret 12 that is rotatably provided by a driving mechanism (not shown), and two winding cores 13 that are provided at 180 ° intervals in the rotation direction of the turret 12. , 14, the two support rollers 15a, 15b, the separator sheets 2, 3 and the protective tape 7 provided at positions shifted from the winding cores 13, 14 by approximately 90 ° in the rotation direction of the turret 12, respectively. A sheet cutter 16 serving as a sheet cutting means, and a pressing roller 17 for suppressing the various sheets 2 to 5 after winding from being scattered.

  The winding cores 13 and 14 are for winding the various sheets 2 to 5 on the outer peripheral side of the winding cores 13 and 14, respectively, and are configured to be rotatable about their own central axis as a rotation axis by a driving mechanism (not shown). Further, the winding cores 13 and 14 are provided so as to be able to appear and retract with respect to the turret 12 along the axial direction of the turret 12 (the depth direction in FIG. 4 and the like).

  As shown in FIG. 5, the winding core 13 (14) includes a pair of core pieces 13 a and 13 b (14 a and 14 b) extending along its own axial direction (the depth direction in FIG. 5). Between the core pieces 13a and 13b (14a and 14b), slits 13s (14s) through which various sheets 2 to 5 can be inserted are formed.

  The winding core 13 (14) includes a chuck mechanism 13t (14t) as a fixing means for fixing the various sheets 2 to 5 in the slit 13s (14s).

  The chuck mechanism 13t (14t) includes a tube 131 (141) having a substantially hexagonal cross section and a space inside, and an air supply / discharge mechanism (not shown) connected to the tube 131 (141). The upper part of the tube 131 (141) is an adhesive part 132 (142) in the figure, and this adhesive part 132 (142) is adhered to the core piece 13a (14a). Further, the tube 131 (141) has a sandwiching portion 133 (143) at the lower portion in the figure, and the sandwiching portion 133 (143) is disposed so as to face the other core piece 13b (14b). Furthermore, the air supply / discharge mechanism is capable of supplying air to the internal space of the tube 131 (141) and discharging air from the internal space. And the tube 131 (141) expand | swells when air is supplied to the internal space, and makes the said clamping part 133 (143) protrude from one core piece 13a (14a). In addition, the tube 131 (141) shrinks when the air in the inner space is discharged, and the sandwiching portion 133 (143) is immersed in the recess 134 (144) of the one core piece 13a (14a). With this configuration, as shown in FIG. 5, the chuck mechanism 13t (14t) allows the separator sheets 2 and 3, the positive electrode sheet 4 inserted between the core pieces 13a and 13b (14a and 14b), and the protection attached thereto. At least one of the tape 7 and at least one of the negative electrode sheet 5 and the protective tape 7 attached thereto can be sandwiched. In addition, in FIG. 5 etc., the various sheets 2-5 and the protective tape 7 are shown thicker than actual.

  Returning to FIG. 4, the winding cores 13 and 14 are configured to be capable of turning between the winding position P <b> 1 as the first position and the removal position P <b> 2 as the second position when the turret 12 rotates. Yes.

  The winding position P1 is a position where the various sheets 2 to 5 are wound around the winding cores 13 and 14, and the various sheets 2 to 2 are respectively supplied from the supply mechanisms 31, 41, 51 and 61 to the winding position P1. 5 will be supplied.

  The removal position P <b> 2 is a position for removing the various sheets 2 to 5 after winding, that is, the battery element 1. A removal device (not shown) or the like for removing the battery element 1 from the winding cores 13 and 14 is provided in the periphery of the removal position P2.

  The support rollers 15a and 15b are for hooking and supporting the various sheets 2 to 5 between the winding cores 13 and 14 moved to the removal position P2 and the supply mechanisms 31, 41, 51 and 61.

  The sheet cutter 16 is disposed in the vicinity of the winding position P1, and is moved away from the turret 12 and the winding cores 13 and 14 at a cutting position where the sheet cutter 16 approaches the turret 12 and cuts the separator sheets 2 and 3 and the protective tape 7. It is possible to move to a retreat position that does not hinder.

  The presser roller 17 is disposed in the vicinity of the detaching position P2, and is close to the turret 12 and presses the various sheets 2 to 5 after winding, and is separated from the turret 12 and prevents the winding cores 13 and 14 from moving. It is configured to be movable to and without a retracted position.

  Next, the manufacturing method of the battery element 1 using the winding apparatus 10 mentioned above is demonstrated.

  First, the procedure for applying the protective tape 7 to the electrode sheets 4 and 5 will be described in detail by taking the case of the positive electrode sheet 4 as an example. The procedure for applying the protective tape 7 to the negative electrode sheet 5 is substantially the same as the procedure for applying the protective tape 7 to the positive electrode sheet 4, but there are some differences (this will be described later).

  As will be described later, when the positive electrode sheet 4 is fixed by the chuck mechanism 13t (14t), the first feeding roller 84 stops, while the second feeding roller 86 continues to rotate, and the upstream side thereof The positive electrode sheet 4 is fed out. In the meantime, in the buffer mechanism 85, the raising / lowering roller 85c descends, and the positive electrode sheet 4 that has been fed is stored. Here, at least during the sticking operation of the protective tape 7 described later (while the second feeding roller 86 is stopped), the amount fed by the first feeding roller 84 is stored.

  When the winding operation for the next one element is started by the winding unit 11, the first feeding roller 84 and the second feeding roller 86 rotate in synchronization with each other, and the winding unit starts from the positive electrode sheet raw fabric 32. 11, the positive electrode sheets 4 are sequentially conveyed.

  Subsequently, based on the measurement value of the encoder provided on the second feeding roller 86, the separation position X1 (see FIG. 11) of the positive electrode sheet 4 for one element wound by the winding unit 11 is the cutting and pasting device 87 (see FIG. 11). When it is determined that the predetermined position of the cutter mechanism 90) has been reached, the second feeding roller 86 stops. On the other hand, the first feeding roller 84 continues to rotate, and the winding operation by the winding unit 11 is continued. Therefore, while the second feeding roller 86 is stopped and the first feeding roller 84 is rotating, in the buffer mechanism 85, the elevating roller 85c is raised and the stored positive electrode sheet 4 is fed. . The separation position X1 is defined between the terminal portion of the positive electrode sheet 4 wound by the one core 13 (14) and the starting end portion of the positive electrode sheet 4 wound next time by the other core 14 (13). It can also be called a break position.

  When the second feeding roller 86 is stopped and the conveyance of the positive electrode sheet 4 on the upstream side is stopped, the upstream gripping portion 91a and the downstream gripping portion 91b of the gripping mechanism 91 are driven as shown in FIG. Then, the positive electrode sheet 4 is gripped on the upstream side and the downstream side of the cutter mechanism 90. The punching mechanism 93 is driven with the positive electrode sheet 4 gripped in this manner, and the positive electrode sheet 4 is positioned at a position where the cutting portion or the planned cutting portion (that is, the separation position X1) of the positive electrode sheet 4 is sandwiched. Is punched out to form the threading portion 6. This step corresponds to a through portion forming step. At the same time, the cutter mechanism 90 is driven to cut the positive electrode sheet 4 at the separation position X1. This step corresponds to an electrode sheet cutting step.

  After the cutting of the sheet, the cutter mechanism 90 and the punching mechanism 93 retreat out of the transport path of the positive electrode sheet 4, and the gripping portions 91a and 91b of the gripping mechanism 91 hold the positive electrode sheet 4 as shown in FIG. Only the upstream gripping portion 91a moves to the upstream side in the sheet conveying direction (right side in FIG. 8) while gripping. Thereby, the clearance gap 4c is formed between the upstream part 4a and the downstream part 4b of the cut | disconnected positive electrode sheet 4 (refer FIG. 12). This process corresponds to a sheet separation process. Further, during this process, the protective tape 7 is supplied in advance from a predetermined supply device to both the holding portions 92a and 92b of the tape applying mechanism 92.

  After the gap 4c is formed between the upstream portion 4a and the downstream portion 4b of the positive electrode sheet 4, as shown in FIGS. 9 and 13 (in FIG. 13, various mechanisms and the like are not shown), the protective tape 7 Both holding portions 92a and 92b of the tape applying mechanism 92 that holds the pressure act on the positive electrode sheet 4 side. Thereby, the protective tape 7 is affixed from both the front and back surfaces of the positive electrode sheet 4 so as to connect the upstream portion 4a and the downstream portion 4b of the positive electrode sheet 4. As a result, the two protective tapes 7 are bonded to each other through the through portion 6, and are also bonded to each other at the gap 4c (see FIG. 14). This process corresponds to a sheet connecting process.

  Then, when the cutter mechanism 90, the gripping mechanism 91, the tape applying mechanism 92, and the punching mechanism 93 return to their original states (see FIG. 6) and the protective tape 7 is applied, the first feeding roller 84 and the The two feeding rollers 86 rotate in synchronization. Then, the positive electrode sheet 4 is again conveyed as a single positive electrode sheet 4 to the downstream side continuously by the upstream portion 4a and the downstream portion 4b connected by the protective tape 7 as before the sheet cutting. It will be done.

  At the time of attaching the protective tape 7 to the negative electrode sheet 5, as shown in FIG. 10, the amount of movement to the upstream gripping portion 91a relative to the upstream side in the sheet conveying direction (right side in FIG. 10) is the positive electrode sheet 4 The amount of movement is smaller than the amount of movement at the time of attaching the protective tape 7 to the cover. Therefore, a gap 5c smaller than the gap 4c formed between the upstream part 4a and the downstream part 4b of the positive electrode sheet 4 is provided between the upstream part 5a and the downstream part 5b of the negative electrode sheet 5. Is formed (see FIG. 15). Then, the protective tape 7 shorter than the protective tape 7 applied to the positive electrode sheet 4 is applied to both the front and back surfaces of the negative electrode sheet 5 so as to connect the upstream portion 5a and the downstream portion 5b of the negative electrode sheet 5 respectively. (See FIG. 16). As in the case of the positive electrode sheet 4, the two protective tapes 7 are bonded to each other through the through portion 6.

  Subsequently, a winding procedure of the battery element 1 by the winding unit 11 will be described in detail. Here, from the stage where the winding of the various sheets 2 to 5 for one battery element is almost completed with respect to one core 13 as the first core, with respect to the other core 14 as the second core. It demonstrates in detail along the process until it starts winding various sheets 2-5. In the present embodiment, the winding with the cores 13 and 14 is performed so that the negative electrode sheet 5 is positioned on the outer peripheral side of the positive electrode sheet 4.

  When various sheets 2 to 5 are wound on the one winding core 13 at the winding position P1 by a predetermined length (see FIG. 17), the turret 12 rotates without stopping the winding operation by the winding core 13. To do. As a result, one winding core 13 moves to the removal position P2 side while winding the various sheets 2 to 5, and the other winding core 14 is immersed in the turret 12 while being wound to the winding position P1 side. (See FIG. 18). This process corresponds to a core moving process.

  When the core 13 reaches the removal position P2 and the core 14 reaches the winding position P1, the rotation operation of the turret 12 and the rotation operation of the core 13 are stopped. In such a state, the various sheets 2 to 5 arranged from the guide rollers 88a and 88b to the core 13 are caught by the support roller 15a, and the various sheets 2 to 5 are interposed between the support roller 15a and the guide rollers 88a and 88b. It will be in a state of being stretched straight.

  Further, in the initial state where the core 14 immersed in the turret 12 has reached the winding position P1, the longitudinal direction of the various sheets 2 to 5 disposed between the support roller 15a and the guide rollers 88a and 88b Thus, the through-direction of the slit 14s of the core 14 is substantially parallel.

  In this state, the core 14 protrudes from the turret 12. Thereby, it will be in the state where various sheets 2-5 were penetrated in slit 14s of core 14 (refer to Drawing 19). This process corresponds to a slit insertion process. In this state, the holding portion 143 is immersed in the concave portion 144 of one core piece 14a.

  Thereafter, the core 13 positioned at the removal position P2 is rotated again, and the winding of the various sheets 2 to 5 is resumed (see FIG. 20). This process corresponds to a winding process. As the winding is performed, the protective tapes 7 attached to the electrode sheets 4 and 5 gradually approach the core 14. And when each protective tape 7 passes the guide rollers 88a and 88b, each protective tape 7 will be in the state piled up mutually.

  Further, the winding of the winding core 13 is advanced, and each protective tape 7 affixed to each electrode sheet 4, 5 is wound on the winding core based on the measurement value of an encoder (not shown) provided on the winding portion 11 (winding core 13). When the predetermined position between 13 and 14 is reached, the winding operation by the winding core 13 is stopped (see FIG. 21). The predetermined position includes the inside of the slit 14s of the winding core 14 disposed at the winding position P1 (a part of both the protective tapes 7 is located at a cuttable position downstream of the winding core 14). Just do).

  Thereafter, the chuck mechanism 14t of the winding core 14 is driven, and the electrode sheets 4 and 5 (and / or the protective tape 7 attached thereto) and the separator sheets 2 and 3 are fixed. This process corresponds to a fixing process. At the same time, the various sheets 2 to 5 wound around the core 13 are pressed by the pressing roller 17 (see FIG. 22).

  When the separator sheets 2, 3, etc. are fixed to the core 14, the sheet cutter 16 is actuated, and the separator sheets 2, 3 and the respective protective tapes 7 that are stacked in the vicinity of the core 14 are attached at once. Disconnect. This process corresponds to a sheet cutting process. As a result, the separator sheets 2 and 3 are cut to a length that slightly protrudes from the winding core 14, and when the separator sheets 2 and 3 are wound, the start ends of the electrode sheets 4 and 5 are formed at the start ends of the separator sheets 2 and 3. Thus, the terminal portions of the electrode sheets 4 and 5 are covered with the terminal portions of the separator sheets 2 and 3.

  After the separator sheets 2 and 3 and the protective tapes 7 are cut, the core 13 is rotated while the sheets 2 to 5 are being pressed by the pressing roller 17 (see FIG. 23). Thus, the end portions of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are completely wound up without being scattered. This process corresponds to a terminal end winding process.

  Then, as shown in FIG. 24 (FIG. 24 schematically shows the protective tape 7 and the like), the end portions of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are wound with a predetermined fixing tape 8. By stopping, the winding operation of the various sheets 2 to 5 is completed, and the battery element 1 is completed. The completed battery element 1 is a battery in which the end portions of the separator sheets 2 and 3 and the end portions of the protective tapes 7 are slightly shifted if the various sheets 2 to 5 are wound normally. It appears on the outer periphery of the element 1. Therefore, in the battery element 1 in which the winding operation is normally performed, the adhesive surface of the fixing tape 8 is in contact with each of the protective tape 7, the electrode sheets 4 and 5, and the separator sheets 2 and 3 over a wide range. It has become.

  The completed battery element 1 is removed from the core 13 by the above-described removal device. After the battery element 1 is removed, the core 13 is immersed in the turret 12.

  In addition, after the separator sheets 2 and 3 and the protective tape 7 are cut, the winding operation of the terminal portions of the various sheets 2 to 5 at the removal position P2 is performed, and at the same time, the various sheets 2 to 2 at the winding position P1 are wound. Start 5 winding work.

  Thereafter, the above-described steps are repeated, and the various sheets 2 to 5 are alternately wound around the cores 13 and 14, whereby the battery elements 1 are sequentially manufactured.

  As described above in detail, according to the present embodiment, the through portions 6 are formed at the end portions of the electrode sheets 4 and 5, and the electrode 6 is provided between the end portions of the through portions 6 and the electrode sheets 3 and 4. The sheets 4 and 5 are present. Then, the protective tapes 7 are bonded to each other through the threading portion 6, and when a force is applied to the protective tape 7 along the longitudinal direction of the sheet, the bonded portions of both protective tapes 7 are caught on the electrode sheets 4, 5. It is in a state. Thereby, it can suppress effectively that the protective tape 7 peels from the electrode sheets 4 and 5, or the protective tape 7 shifts | deviates with respect to the electrode sheets 4 and 5. As a result, the protective tape 7 can be firmly adhered to the electrode sheets 4 and 5, and the operational effects of providing the protective tape 7 can be more reliably exhibited.

  Further, in the present embodiment, since the through portion 6 has a hole shape surrounded by the electrode sheets 4 and 5, the adhesive portion of both the protective tapes 7 is surrounded by the electrode sheets 4 and 5. Become. Therefore, the peeling and shifting of the protective tape 7 can be more effectively suppressed, and the protective tape 7 can be more firmly applied to the electrode sheets 4 and 5. In addition, the protective tape 7 is firmly attached to the electrode sheets 4 and 5, so that it is possible to effectively prevent the winding of the electrode sheets 4 and 5 from being hindered, thereby improving productivity. be able to.

  In addition, the length of the surplus portion (the portion that does not cover the electrode sheets 4 and 5) at the end of the separator sheets 2 and 3 is close to the cut portion of the electrode sheets 4 and 5 from the cut portion of the protective tape 7. It is about the same as the length to the side edge. Accordingly, the separator sheets 2 and 3 are wound to some extent after the protective tape 7 is cut, and then the amount of the separator sheets 2 and 3 used can be reduced as compared with the case where the separator sheets 2 and 3 are cut. Cost reduction and size reduction of the battery element 1 can be achieved.

  In addition, since the cut surfaces of the electrode sheets 4 and 5 are covered and protected by the protective tape 7, even if burrs and edges associated with the cutting occur on the cut surfaces of the electrode sheets 4 and 5, It can be prevented from being exposed. Thereby, the situation where the separator sheets 2 and 3 are damaged by a burr | flash etc. can be prevented, and the quality improvement of the battery element 1 can be aimed at.

  Furthermore, according to this embodiment, in the obtained battery element 1, the positive electrode sheet 4 can be more reliably covered with the negative electrode sheet 5. Therefore, there are problems associated with the positive electrode sheet 4 not being covered with the negative electrode sheet 5 (for example, needle-like precipitates are formed on the positive electrode sheet 4 and the separator sheets 2 and 3 are damaged). It can be effectively suppressed. As a result, the quality of the battery element 1 can be further improved.

  In addition, if the obtained battery element 1 is one in which the electrode sheets 4 and 5 and the separator sheets 2 and 3 are wound normally, the protective tape 7 and the separator sheets 2 and 3 are provided at the terminal portions thereof. It becomes possible to confirm the end edge part of this by visual observation. Therefore, it is possible to easily determine whether the electrode sheets 4 and 5 and the separator sheets 2 and 3 in the battery element 1 are in a wound state by visually confirming the terminal portion of the battery element 1.

  At the same time, the respective edge portions of the protective tape 7 and the separator sheets 2 and 3 are slightly shifted so that at least the protective tape 7 and the separator sheets 2 and 3 (this In the embodiment, the electrode sheets 4 and 5, the protective tape 7, and the separator sheets 2 and 3) can be more reliably brought into contact with each other. As a result, the winding in the battery element 1 can be more reliably and firmly performed.

  Further, the step of cutting the protective tape 7 and the step of cutting the separator sheets 2 and 3 can be integrated into one step. Therefore, production efficiency can be improved extremely effectively.

  Furthermore, in this embodiment, since the cutting of the electrode sheets 4 and 5 and the formation of the through portion 6 are performed at a time, the productivity can be further improved.

  In addition, in this embodiment, the length of the electrode sheets 4 and 5 for one element that is actually supplied can be measured by using the attachment position of the protective tape 7. Further, the calculation control device 89 and the like can adjust the lengths of the electrode sheets 4 and 5 supplied from the supply mechanisms 31 and 41 based on the measured lengths of the electrode sheets. Therefore, the length of the electrode sheets 4 and 5 in the battery element 1 can be made more appropriate, and the quality of the battery element 1 can be further improved.

  In addition, by adjusting the lengths of the electrode sheets 4 and 5, it is possible to more reliably prevent a large shift in the position of each protective tape 7 when the protective tape 7 is cut by the sheet cutter 16. it can. Thereby, each protection tape 7 can be more reliably piled up at the time of cutting of protection tape 7, etc., and each protection tape 7 and separator sheets 2 and 3 can be more reliably cut at once by sheet cutter 16. As a result, more stable productivity can be ensured.

In addition, in the present embodiment, at one of the plurality of cores 13 and 14, the downstream portion (terminal portion) of the separator sheets 2 and 3 and the electrode sheets 4 and 5 is wound, and at the same time, A new turn can be started at. As a result, productivity can be improved as compared with a winding device having only one winding core.
[Second Embodiment]
Next, the second embodiment will be described focusing on differences from the first embodiment.

  In the first embodiment, the winding part 11 has a turret 12 and a plurality of cores 13 and 14. On the other hand, the winding part 21 in this 2nd Embodiment is not provided with the turret, but is provided only with the one core 22 as shown in FIG. The winding core 22 has substantially the same configuration as the winding cores 13 and 14 in the first embodiment except that the rotation axis does not move (in a direction intersecting the axis). That is, the winding core 22 is for winding the various sheets 2 to 5 on the outer periphery thereof, and is configured to be rotatable about its own central axis as a rotation axis by a driving mechanism (not shown). As shown in FIG. 26, the winding core 22 includes a pair of core pieces 22a and 22b extending along its own axial direction (the depth direction in FIG. 26), and between the pair of core pieces 22a and 22b. Are formed with slits 22s through which various sheets 2 to 5 can be inserted. Further, the core 22 includes a chuck mechanism 22t for fixing the various sheets 2 to 5 in the slit 22s.

  As shown in FIG. 27, a sheet cutter 23 as a sheet cutting means for cutting the separator sheets 2 and 3 and the protective tape 7 and a pressing roller 24 are provided in the vicinity of the core 22. .

  The sheet cutter 23 can be moved to a cutting position where the separator sheets 2 and 3 and the protective tape 7 are cut close to the conveying path of the sheets 2 to 5 and a retreat position which is separated from the conveying path of the various sheets 2 to 5. It is configured.

  The presser roller 24 is disposed in the vicinity of the core 22, and can move to a proximity position where the sheet 22 approaches the core 22 and presses the various sheets 2 to 5 after winding, and a retracted position that is separated from the core 22. It is configured.

  A removal device (not shown) for removing the battery element 1 from the winding core 22 is provided corresponding to the winding core 22.

  Further, a support roller 25 (see FIG. 27 and the like) for supporting the various sheets 2 to 5 is provided between the guide rollers 88 a and 88 b and the winding core 22 in the middle of the supply path of the various sheets 2 to 5. ing. A chuck mechanism 26 as a fixing unit is provided in the middle of the supply path of the various sheets 2 to 5 and upstream of the support roller 25. The chuck mechanism 26 has a function of sandwiching at least one of the electrode sheets 4 and 5 and the protective tape 7 attached to the electrode sheets 4 and 5 and the separator sheets 2 and 3. The chuck mechanism 26 is configured to be movable along a supply path of the various sheets 2 to 5 to an approach position that approaches the core 22 and a separation position that is separated from the core 22.

  Subsequently, a winding procedure of the battery element 1 by the winding unit 21 will be described in detail. Here, a detailed description will be given along the process from the stage where the winding of the various sheets 2 to 5 to the core 22 is completed to the point where the various sheets 2 to 5 start to be wound around the core 22 again. 26 to 29 schematically show the various sheets 2 to 5 wound around the winding core 22. Further, the upstream portion 4a, 5a and the downstream portion 4b, 5b of each electrode sheet 4, 5 are formed with a through portion 6 in advance, and the upstream portion 4a, 5a and the downstream portion 4b, 5b are previously formed. It is assumed that they are connected by a protective tape 7.

  As the winding of the various sheets 2 to 5 with respect to the core 22 proceeds, the protective tapes 7 attached to the electrode sheets 4 and 5 gradually approach the core 22. When the protective tapes 7 pass through the guide rollers 88a and 88b, the protective tapes 7 are put on top of each other. The process of winding the various sheets 2 to 5 and putting the protective tapes 7 on top of each other corresponds to the winding process. During the winding of the various sheets 2 to 5 on the winding core 22, the various sheets 2 to 5 arranged from the guide rollers 88 a and 88 b to the winding core 22 are caught by the support roller 25. The various sheets 2 to 5 are straightly stretched between the support roller 25 and the guide rollers 88a and 88b.

  The winding of the winding core 22 is advanced, and each protective tape 7 affixed to each of the electrode sheets 4 and 5 is attached to the support roller 25 and the winding roller 21 (winding core 22) based on the measurement value of an encoder (not shown) provided on the winding portion 21. When a predetermined position between the guide rollers 88a and 88b is reached, the winding operation by the winding core 22 is stopped (see FIG. 27).

  Next, the chuck mechanism 26 clamps the upstream side of the protective tape 7 among the various sheets 2 to 5. This process corresponds to a fixing process. At the same time, the various sheets 2 to 5 wound around the winding core 22 are pressed by the pressing roller 24 (see FIG. 28).

  When the separator sheets 2, 3, etc. are fixed by the chuck mechanism 26, the sheet cutter 23 is activated, and the separator sheets 2, 3 and the respective protective tapes 7 are cut at once in the vicinity of the core 22. (See FIG. 29). This process corresponds to a sheet cutting process.

  After the separator sheets 2 and 3 and the respective protective tapes 7 are cut, the core 22 is rotated while the sheets 2 to 5 are being pressed by the pressing roller 24. Thus, the end portions of the separator sheets 2 and 3 and the electrode sheets 4 and 5 are completely wound up without being scattered.

  And the winding | wrapping operation | work of the various sheets 2-5 is completed by winding the termination | terminus part of the various sheets 2-5 with the fixing tape 8 (refer FIG. 24), and the battery element 1 is completed. The completed battery element 1 is removed from the core 22 by the above-described removing device after the supply of air is stopped and the chuck mechanism 22t is squeezed.

  Next, the various sheets 2 to 5 sandwiched by the chuck mechanism 26 are inserted into the slits 22s of the core 22 (see FIG. 30). Next, the chuck mechanism 22t is driven, and the electrode sheets 4 and 5 and the separator sheets 2 and 3 and the separator sheets 2 and 3 are fixed in the slit 22s by the chuck mechanism 22t. Then, after the clamping of the various sheets 2 to 5 by the chuck mechanism 26 is released, the winding operation of the various sheets 2 to 5 is started by rotating the winding core 22.

  Thereafter, the above-described steps are repeatedly performed, and the battery elements 1 are sequentially manufactured by sequentially winding the various sheets 2 to 5 around the core 22.

As described above, according to the second embodiment, the same operational effects as those of the first embodiment are basically obtained. That is, in the obtained battery element 1, the protective tape 7 can be firmly attached to the electrode sheets 4, 5, and the effects obtained by providing the protective tape 7 can be more reliably exhibited. In addition, the production efficiency can be improved extremely effectively, and stable productivity can be obtained.
[Third Embodiment]
Next, the third embodiment will be described focusing on the differences from the first embodiment.

  In the said 1st Embodiment, it is comprised so that the upstream parts 4a and 5a and the downstream parts 4b and 5b of each electrode sheet 4 and 5 may be connected by the protective tape 7. FIG. On the other hand, in this 3rd Embodiment, it is comprised so that the upstream parts 4a and 5a and the downstream parts 4b and 5b of each electrode sheet 4 and 5 may be connected by the protective tape 7 and the connecting tape 9 ( (See FIGS. 33 and 35). The connection tape 9 is formed of the same heat-resistant material (for example, polypropylene) as the constituent material of the protective tape 7, but does not include an adhesive layer unlike the protective tape 7. In the third embodiment, the protective tape 7 and the connecting tape 9 correspond to a tape portion.

  In the third embodiment, the detection sensor 83 is configured to detect the protective tape 7 and the connecting tape 9. The detection sensor 83 simply detects the presence of the tape without distinguishing between the protective tape 7 and the connection tape 9.

  Furthermore, in the third embodiment, the cutting and sticking device 120 provided in the middle of the conveyance path of the positive electrode sheet 4 is protected along with functions such as cutting the positive electrode sheet 4, forming the through portion 6, and sticking the protective tape 7. When the tape 7 is attached, the connecting tape 9 is disposed between the upstream portion 4a and the downstream portion 4b of the positive electrode sheet 4. Next, the configuration of the cutting and sticking device 120 will be described.

  The cutting and sticking device 120 holds the positive electrode sheet 4 when cutting the positive electrode sheet 4 and forming the through portion 6, as shown in FIG. A gripping mechanism 122 as a sheet separating means, a tape placement mechanism 123 as a tape placement means for placing the connection tape 9 between the upstream portion 4a and the downstream portion 4b of the positive electrode sheet 4, the connection tape 9 and A tape applying mechanism 124 as a tape connecting means for attaching the protective tape 7 to the cut portion of the positive electrode sheet 4 and a punching mechanism 125 as a through part forming means for forming the through part 6 in the positive electrode sheet 4. I have. In each drawing, each mechanism and the like are schematically displayed.

  The cutter mechanism 121 includes an upper blade 121 a located on the upper side of the positive electrode sheet 4 and a lower blade 121 b located on the lower side of the positive electrode sheet 4. The blades 121a and 121b are configured to be retractable outside the conveyance path of the positive electrode sheet 4.

  The gripping mechanism 122 includes an upstream gripping portion 122a that can grip the positive electrode sheet 4 on the upstream side of the cutter mechanism 121, and a downstream gripping portion 122b that can grip the positive electrode sheet 4 on the downstream side of the cutter mechanism 121. And the upstream gripping portion 122a is configured to be able to advance and retreat along the conveyance path of the positive electrode sheet 4 with respect to the downstream gripping portion 122b. The upstream gripping part 122a can be moved by a driving means (not shown) between a retracted position spaced a considerable distance from the downstream gripping part 122b and a closest approach position closest to the downstream gripping part 122b. However, the retracted position is a position further away from the downstream gripping portion 122b than the retracted position in the first embodiment.

  The tape placement mechanism 123 includes an upper holding piece 123a that can hold the connecting tape 9 above the positive electrode sheet 4, and a lower holding piece 123b that faces the upper holding piece 123a with the positive electrode sheet 4 interposed therebetween. And. Each of the sandwiching pieces 123a and 123b can be moved up and down by a driving means (not shown) so that the connection tape 9 can be sandwiched.

  One tape application mechanism 124 is provided on each of the upstream side and the downstream side of the tape placement mechanism 123, and each tape application mechanism 124 is capable of holding the protective tape 7 above the positive electrode sheet 4. It has a holding part 124 a and a lower holding part 124 b that can hold the protective tape 7 at a position below the positive electrode sheet 4. Each holding part 124a, 124b is configured to be movable up and down in the vertical direction by driving means (not shown).

  One punching mechanism 125 is provided on each of the upstream side and the downstream side of the cutter mechanism 121, and the punching blade 125 a is positioned above the positive electrode sheet 4 and has a shape corresponding to the through portion 6. And a receiving portion 125b located on the lower side of the electrode sheet 4. The punching blade 125a and the receiving portion 125b approach the positive electrode sheet 4 by driving means (not shown), and the positive electrode sheet 4 is punched by the punching blade 125a so that the through portion 6 is formed. It has become. Further, the punching blade 125 a and the receiving portion 125 b are configured to be retractable outside the conveyance path of the positive electrode sheet 4.

  A cutting and sticking device 120 is also provided in the middle of the conveyance path of the negative electrode sheet 5. Since the configuration of the cutting and sticking device 120 is substantially the same as that provided in the conveyance path of the positive electrode sheet 4, detailed description thereof is omitted.

  Subsequently, the connection procedure of the upstream portions 4a and 5a and the downstream portions 4b and 5b of the electrode sheets 4 and 5 by the cutting and sticking device 120 will be described in detail by taking the case of the positive electrode sheet 4 as an example. In addition, the connection procedure of the upstream part 5a and the downstream part 5b in the negative electrode sheet 5 is substantially the same as the connection procedure of the upstream part 4a and the downstream part 4b in the positive electrode sheet 4, but there are some differences. Yes (this point will be explained later).

  Along with the winding operation by the winding unit 11, the measured value of the encoder provided on the second feeding roller 86 in the state in which the positive electrode sheet 4 is sequentially conveyed from the positive electrode sheet raw fabric 32 to the winding unit 11. Based on this, when it is determined that the separation position X1 (see FIG. 11) of the positive electrode sheet 4 for one element wound by the winding unit 11 has reached a predetermined position of the cutting and pasting device 120 (cutter mechanism 121), The two-feed roller 86 stops. On the other hand, the first feeding roller 84 continues to rotate, and the winding operation by the winding unit 11 is continued.

  When the second feeding roller 86 is stopped and the transport of the positive electrode sheet 4 on the upstream side is stopped, the upstream gripping portion 122a and the downstream gripping portion 122b of the gripping mechanism 122 are driven as shown in FIG. Then, the positive electrode sheet 4 is gripped on the upstream side and the downstream side of the cutter mechanism 121. Then, with the positive electrode sheet 4 held in this manner, the punching mechanism 125 is driven, and the positive electrode sheet 4 is sandwiched between the cut portion or the planned cutting portion (that is, the separation position X1) of the positive electrode sheet 4. Is punched out to form the threading portion 6. At the same time, the cutter mechanism 121 is driven to cut the positive electrode sheet 4 at the separation position X1.

  After cutting the sheet, the blades 121a and 121b of the cutter mechanism 121 and the punching blade 125a and the receiving portion 125b of the punching mechanism 125 are retracted out of the transport path of the positive electrode sheet 4. Further, as shown in FIG. 38, while the gripping portions 122a and 122b of the gripping mechanism 122 grip the positive electrode sheet 4, only the upstream gripping portion 122a moves to the upstream side in the sheet conveying direction (right side in FIG. 38). . Thereby, a gap 4c is formed between the upstream portion 4a and the downstream portion 4b of the cut positive electrode sheet 4 (see FIG. 31). Note that the amount of movement of the upstream gripping portion 122a in the sheet conveying direction upstream in the third embodiment is larger than the amount of movement in the first embodiment. Therefore, the gap 4c in the third embodiment is wider than the gap 4c in the first embodiment.

  Further, when the upstream gripping portion 122a is moved, the connecting tape 9 is supplied in advance from a predetermined supply device to the upper holding piece portion 123a of the tape placement mechanism 123.

  Next, as shown in FIG. 39, both sandwiching pieces 123a and 123b of the tape arrangement mechanism 123 are operated to the positive electrode sheet 4 side, and the connection tape 9 is arranged in the gap 4c. During this time, the protective tape 7 is supplied in advance from a predetermined supply device to the two holding portions 124a and 124b of each tape applying mechanism 124. The protective tape 7 may be supplied to the tape applying mechanism 124 when the connecting tape 9 is supplied to the tape arrangement mechanism 123.

  Next, as shown in FIG. 32 (various mechanisms are not shown in FIG. 32) and FIG. 40, both holding portions 124a and 124b of the tape applying mechanism 124 holding the protective tape 7 are operated to the positive electrode sheet 4 side. To do. Thereby, with respect to the upstream part 4a of the positive electrode sheet 4 and the upstream end of the connecting tape 9, and the downstream part 4b of the positive electrode sheet 4 and the downstream end of the connecting tape 9, the positive electrode sheet The protective tape 7 is affixed from both the front and back surfaces of 4 respectively. As a result, the upstream portion 4a and the downstream portion 4b of the positive electrode sheet 4 are connected by the protective tape 7 and the connecting tape 9 (see FIG. 33). Further, the protective tapes 7 are bonded to each other through the through portion 6.

  When the cutter mechanism 121, the gripping mechanism 122, the tape placement mechanism 123, the tape sticking mechanism 124, and the punching mechanism 125 are returned to their original states and the sticking operation of the protective tape 7 is completed, the first feeding roller 84 and the The two feeding rollers 86 rotate in synchronization. The positive electrode sheet 4 is again a single positive electrode sheet 4 as before the sheet cutting, and the upstream portion 4a and the downstream portion 4b connected by the protective tape 7 and the connecting tape 9 are continuous. It will be conveyed downstream.

  Incidentally, at the time of connecting the upstream portion 5a and the downstream portion 5b of the negative electrode sheet 5, as shown in FIG. 41, the amount of movement to the upstream gripping portion 122a relative to the upstream side in the sheet conveying direction (right side in FIG. 41) is The amount of movement of the positive electrode sheet 4 during the connecting operation of the upstream portion 4a and the downstream portion 4b is smaller. Therefore, the gap 4c formed between the upstream part 4a and the downstream part 4b of the positive electrode sheet 4 is between the upstream part 5a and the downstream part 5b of the cut negative electrode sheet 5. A small gap 5c is formed (see FIG. 34). And the upstream part 5a and the downstream part 5b of the negative electrode sheet 5 will be connected by the connection tape 9 shorter than the connection tape 9 which connects the positive electrode sheet 4 (refer FIG. 35).

  Next, a difference between the winding procedure of the battery element 1 by the winding unit 21 and the first embodiment will be described.

  In the first embodiment, when the protective tape 7 attached to the electrode sheets 4 and 5 gradually approaches the core 14 as the winding is performed, the protective tape 7 passes through the guide rollers 88a and 88b. Thus, the respective protective tapes 7 are configured to overlap each other. On the other hand, in the third embodiment, as shown in FIG. 42, the protective tape 7 and the connecting tape 9 that connect the electrode sheets 4 and 5 gradually approach the core 14 as the winding is performed. Go. When the protective tapes 7 and the connection tapes 9 pass through the guide rollers 88 a and 88 b, the protective tape 7 that connects the positive electrode sheet 4 and the protective tape 7 that connects the connection tape 9 and the negative electrode sheet 5. In addition, the connecting tape 9 and the connecting tape 9 are configured to overlap each other.

  Moreover, in the said 1st Embodiment, it is comprised by the sheet cutter 16 so that the separator sheets 2 and 3 and each protective tape 7 of the piled-up state may be cut | disconnected at once. On the other hand, in the third embodiment, as shown in FIG. 43, the protective sheet 7 and the connecting tape 9 for connecting the separator sheets 2 and 3 and the positive electrode sheet 4 that are overlaid by the sheet cutter 16. At least one of the protective tape 7 and the connecting tape 9 that connect the negative electrode sheet 5 is cut at a time.

  As described above, according to the third embodiment, the same functions and effects as those of the first embodiment are basically obtained.

  In addition, according to the third embodiment, a relatively thick portion where the protective tape 7 overlaps between the upstream portions 4a and 5a and the downstream portions 4b and 5b of the electrode sheets 4 and 5 is further increased. Can be short. Thereby, the outer diameter in the obtained battery element 1 can be made comparatively small, and size reduction of the battery element 1 can be achieved further. Moreover, generation | occurrence | production of the bubble between the laminated | stacked protective tapes 7 can be prevented more reliably, and the quality fall of the battery element 1 can be suppressed effectively.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) The through portion has a hole shape or a notch shape penetrating the front and back surfaces of the electrode sheets 4 and 5, and the electrode sheet 4 between the electrode sheets 4 and 5 and the edge of the electrode sheets 4 and 5. , 5 may be used as long as they are formed at the positions where there are 5 and 5 and the shape and number thereof can be changed as appropriate.

  Therefore, for example, as shown in FIG. 44, the through-hole 151 has a long hole shape extending in the sheet width direction, and is configured to be provided in each of the upstream side portions 4a and 5a and the downstream side portions 4b and 5b. May be.

  Further, for example, as shown in FIGS. 45 and 46, the through portions 152 and 153 may be configured to have notches formed at the sheet width direction end edges of the electrode sheets 4 and 5. The notch-shaped through portion may be formed by excision (for example, punching) of the electrode sheets 4 and 5, and is shown in FIG. 47 (FIG. 47 schematically shows a method for forming the through portion 153). In this way, the electrode sheets 4 and 5 may be formed by cutting a part of the part corresponding to the outer edge of the through part and then folding back the part 160 corresponding to the through part.

  Further, as shown in FIGS. 48 and 49, notched female portions 161 and 163 are provided in one of the upstream portions 4a and 5a and the downstream portions 4b and 5b of the electrode sheets 4 and 5, and the electrode sheet 4 , 5 may be provided with male portions 162, 164 corresponding to the shape of the female portions 161, 163 on the other of the upstream portions 4a, 5a and the downstream portions 4b, 5b. And the part in which the electrode sheets 4 and 5 exist between the edge parts of the electrode sheets 4 and 5 among the female parts 161 and 163 is defined as the through parts 154 and 156, and between the edge parts of the electrode sheets 4 and 5. A space sandwiching the male parts 162 and 164 may be used as the through parts 155 and 157. In this case, it is possible to reduce the end material discharged to form the through portion, and it is possible to simultaneously cut the electrode sheets 4 and 5 and form the through portions 154 to 157. As a result, costs can be reduced and productivity can be improved.

  (B) In the above embodiment, the protective tape 7 is applied to the cut portions of the electrode sheets 4 and 5, but after the through portion 6 is formed and before the electrode sheets 4 and 5 are cut. The protective tape 7 may be attached to the scheduled cutting portions of the electrode sheets 4 and 5.

  (C) In the above embodiment, the electrode sheets 4 and 5 are cut and the through portion 6 is formed at the same time, but may be configured to perform both at different timings. .

  (D) The technical idea in the third embodiment may be applied to the technical idea in the second embodiment. That is, each of the electrode sheets 4 and 5 in which the upstream portions 4a and 5a and the downstream portions 4b and 5b are connected by the protective tape 7 and the connecting tape 9 using the wound portion 21 having only one winding core 22. It is good also as winding up. In this case, when the protective tapes 7 and the like pass through the guide rollers 88a and 88b, the protective tape 7 that connects the positive electrode sheet 4 and the protective tape 7 that connects the connecting tape 9 and the negative electrode sheet 5 and the connection. The tape 9 is in a state of being overlapped with each other. When the separator sheets 2, 3, etc. are fixed by the chuck mechanism 26, the sheet cutter 23 is activated, and the separator sheets 2, 3 and the connecting tapes 9, etc., stacked in the vicinity of the core 22, etc. Will be cut at once.

  (E) In the above-described embodiment, the separator sheets 2 and 3 and the protective tapes 7 and the like are cut at a time by the sheet cutters 16 and 23, but cut into the conveyance paths for the various sheets 2 to 5, respectively. A means may be provided, and the various sheets 2 to 5 may be cut at different timings by the cutting means. Further, a chuck mechanism having the same configuration as the chuck mechanism 26 in the second embodiment is provided in each of the conveyance paths of the various sheets 2 to 5, and when the various sheets 2 to 5 are cut, a sheet to be cut by the chuck mechanism is provided. While clamping, after cutting the various sheets 2 to 5, the chuck mechanism may approach the winding part side to supply the various sheets 2 to 5 to the winding part.

  (F) In the above embodiment, the battery device 1 of the lithium ion battery is manufactured by the winding device 10, but the wound body manufactured by the winding device 10 is not limited to this. For example, Alternatively, a wound body of an electrolytic capacitor or the like may be manufactured.

  (G) In the above embodiment, as the cores 13, 14, and 22, the cores in which the outer peripheral shapes of the various sheets 2 to 5 are formed in a circular shape are adopted. , 22 is not limited to this, and, for example, a winding core whose outer peripheral shape is rectangular (flat), elliptical, oval, or the like may be employed.

  (H) The material of the separator sheets 2 and 3 and the electrode sheets 4 and 5 is not limited to the above embodiment. For example, in the above embodiment, the separator sheets 2 and 3 are made of PP, but the separator sheets 2 and 3 may be made of other insulating materials. Further, for example, the active material applied to the electrode sheets 4 and 5 may be appropriately changed. Of course, the material of the protective tape 7 and the connecting tape 9 can be changed as appropriate.

  (I) In the said 1st, 3rd embodiment, although the winding part 11 becomes a structure provided with the two cores 13 and 14, the number of cores is not limited to this, It is good also as a structure provided with three or more winding cores.

  (J) The configuration of the chuck mechanism 13t (14t) is not limited to the above embodiment. For example, it is good also as a structure which a pair of core piece 13a, 13b can displace relatively and can clamp various sheets 2-5.

  (K) The direction of rotation of the cores 13, 14, and 22 is not necessarily limited to the above embodiment, and can be changed as appropriate. Even when the rotation direction of the cores 13, 14, and 22 is changed, the negative electrode sheet can be obtained by adjusting the size of the gaps 4c and 5c (the lengths of the protective tape 7 and the connecting tape 9). 5, the positive electrode sheet 4 can be covered. For example, even when the positive electrode sheet 4 is positioned on the outer peripheral side of the negative electrode sheet 5 in accordance with the change in the rotation direction of the cores 13, 14, and 22, the gap 5 c between the negative electrode sheet 5 and the positive electrode sheet 4 and the gap 4c of FIG. 4 is more than a predetermined difference, and the negative electrode sheet 5 is sufficiently longer than the positive electrode sheet 4 so that the outermost peripheral part of the positive electrode sheet 4 can be covered by one turn. Then, the positive electrode sheet 4 can be covered with the negative electrode sheet 5.

  (L) In the first and third embodiments, the cutter mechanism 90 (121) as the electrode sheet cutting means, the gripping mechanism 91 (122) as the sheet separating means, and the tape applying mechanism 92 (as the tape connecting means) 124) and a punching and sticking device 87 (120) integrally provided with a punching mechanism 93 (125) as a threading portion forming means are adopted, but not limited to this, the cutter mechanism 90 (121), gripping It is good also as a structure provided with at least 1 among the mechanism 91 (122), the tape sticking mechanism 92 (124), and the punching mechanism 93 (125) independently. Moreover, it is good also as a structure provided with the tape arrangement | positioning mechanism 123 as a tape arrangement | positioning means independently.

  (M) In the above embodiment, the separator sheets 2, 3, etc. are cut outside the cores 13, 14, 22 by the sheet cutters 16, 23, but the separator sheets 2, 3, etc. are cut. The configuration is not limited to the above embodiment. For example, it is good also as a structure which equips a core with a cutter and cut | disconnects the separator sheets 2 and 3 etc. inside a slit.

  (N) In the first and third embodiments, the protective tape 7 or the like attached to the electrode sheets 4 and 5 is placed between the cores 13 and 14 based on the measurement values of the encoders provided on the cores 13 and 14. However, the present invention is not limited to this. For example, a sensor may be provided on the cores 13 and 14 and the protective tape 7 may be positioned based on the detection result.

  (O) In the above embodiment, the detection sensor 83 directly detects the protective tape 7 or the like based on the reflected light. For example, when the protective tape 7 or the like is made of a transmissive material, the transmitted light is detected. By detecting the start or end of the electrode sheets 4 and 5 for one element based on the reflected light or by detecting the gaps 4c and 5c formed between the electrode sheets 4 and 5 for one element, The protection tape 7 or the like may be detected indirectly.

  (P) In the first and third embodiments, the turret 12 is provided with the support rollers 15a and 15b for hooking the various sheets 2 to 5, but the support rollers 15a and 15b may be omitted. .

  DESCRIPTION OF SYMBOLS 1 ... Battery element (winding body), 2, 3 ... Separator sheet, 4 ... Positive electrode sheet, 5 ... Negative electrode sheet, 6 ... Through part, 7 ... Protection tape, 9 ... Connection tape, 10 ... Winding device 11, 21 ... winding part, 12 ... turret, 13, 14, 22 ... core, 13 s, 14 s, 22 s ... slit, 13 t, 14 t, 26 ... chuck mechanism (fixing means), 16, 23 ... sheet cutter ( Sheet cutting means), 31 ... Positive electrode sheet supply mechanism, 41 ... Negative electrode sheet supply mechanism, 51, 61 ... Separator supply mechanism, 85a ... Length measuring roller (sheet length measuring means), 86 ... Second feeding roller (supply length) , 89... Calculation control device (sheet length measuring means, supply length adjusting means), 90, 121, cutter mechanism (electrode sheet cutting means), 91, 122, gripping mechanism (sheet separating means), 92, 124 ... , Sticking mechanism (sheet connecting means), 93, 125 ... punching mechanism (passing portion forming means) 123 ... tape placement mechanism (tape placement means), P1 ... winding position (first position), P2 ... removal position (first) 2 position).

Claims (14)

Two strip-shaped electrode sheets having an active material on the surface;
It is made of an insulating material, and includes a strip-shaped separator sheet for making both the electrode sheets in an insulating state,
A wound body in which the sheets are wound in a stacked state,
At the end of the electrode sheet, a hole-shaped or notched through-portion is formed which penetrates the front and back surfaces of the electrode sheet and between which the electrode sheet exists. Has been
A wound body in which protective tapes in a state of being bonded to each other through the through portions are respectively attached to both front and back surfaces of the end portion of the electrode sheet.   The wound body according to claim 1, wherein the through portion has a hole shape surrounded by the electrode sheet. A winding device for winding and winding two strip-shaped electrode sheets having an active material on the surface and a strip-shaped separator sheet made of an insulating material while supplying each from a predetermined supply mechanism,
A core that rotates about its own central axis as a rotation axis, and that can wind each of the electrode sheets and the separator sheet supplied from the supply mechanisms;
An electrode sheet cutting means for cutting each electrode sheet at a position to be separated from a terminal portion to be wound by the winding core and a starting end portion to be wound next time by the winding core;
Of the electrode sheet, in the position where the electrode sheet exists between the cutting part or the scheduled cutting part of the electrode sheet by the electrode sheet cutting means, a hole shape or a notch shape penetrating the front and back of the electrode sheet Threading part forming means for forming a threading part;
Sheet cutting means for separating the upstream side portion and the downstream side portion of the cut portion of the electrode sheet after cutting the electrode sheet by the electrode sheet cutting means;
A state in which protective tape is applied to both the upstream side portion and the downstream side portion of the electrode sheet separated by the sheet separation means from the back and front surfaces of the electrode sheet, and the respective protective tapes are adhered to each other through the through portion. And a sheet connecting means for connecting the upstream portion and the downstream portion of the electrode tape by a tape portion at least a part of which the protective tape forms a winding device. The separator sheet and the electrode sheets are wound by a predetermined amount by the winding core, and the tape sheet and the separator sheet attached to the electrode sheets are stacked, At least one, and fixing means for fixing the separator sheet;
The winding device according to claim 3, further comprising: a sheet cutting unit that cuts the tape portions and the separator sheet that are stacked in a fixed state by the fixing unit at a time. The electrode sheet is configured such that a positive electrode sheet having a positive electrode active material on the surface and a negative electrode sheet having a negative electrode active material on the surface are wound by the core.
When the protective tape is applied by the sheet connecting means, the gap between the upstream portion and the downstream portion of the positive electrode sheet is more than the gap between the upstream portion and the downstream portion of the negative electrode sheet. The winding device according to claim 3, wherein the winding device is configured to be larger. A tape position detecting means provided downstream of the electrode sheet cutting means and the sheet connecting means along the conveying path of each electrode sheet, and detecting the position of the tape portion;
Based on the detection result by the tape position detecting means, a sheet length measuring means for measuring the length of the electrode sheet from the position of the tape portion to the position of the next tape portion,
6. A supply length adjusting unit capable of adjusting a length of the electrode sheet supplied from the supply mechanism based on a measurement result by the sheet length measuring unit. The winding device according to item. A tape disposing means for disposing a predetermined connecting tape between the upstream portion and the downstream portion of the electrode sheet separated by the sheet separating means;
The sheet connecting means includes the protection on both the front and back surfaces of the upstream portion of the electrode sheet and one end portion of the connecting tape, and the back and front surfaces of the downstream portion of the electrode sheet and the other end portion of the connecting tape. A tape is affixed, and the upstream portion and the downstream portion of the electrode sheet are connected by the tape portion including the protective tape and the connecting tape. The winding device according to any one of 6.   The cutting of the electrode sheet by the electrode sheet cutting unit and the formation of the through part by the through part forming unit are performed at one time. The winding device according to item. Using a winding device having a winding core that can rotate about its central axis as a rotation axis, two strip-shaped electrode sheets having an active material on the surface and a strip-shaped separator sheet made of an insulating material A method of manufacturing a wound body for manufacturing a wound body that is rotated,
An electrode sheet cutting step for cutting each of the electrode sheets;
Of the electrode sheet, in the position where the electrode sheet exists between the cutting part or the scheduled cutting part of the electrode sheet in the electrode sheet cutting step, a hole shape or a notch shape penetrating the front and back of the electrode sheet A threading part forming step of forming a threading part;
After the cutting of the electrode sheet in the electrode sheet cutting step, a sheet separating step of separating the upstream portion and the downstream portion of the cut portion in the electrode sheet;
A state in which a protective tape is applied to each of the upstream side portion and the downstream side portion of the electrode sheet separated in the sheet separation step from the front and back surfaces of the electrode sheet, and the protective tape is adhered to each other through the through portion. And a sheet connecting step of connecting the upstream portion and the downstream portion of the electrode tape by a tape portion at least a part of which the protective tape constitutes a wound body manufacturing method. Winding each electrode sheet and the separator sheet with respect to the core, and winding the tape part and the separator sheet attached to each electrode sheet; and
In a state where each of the tape portions and the separator sheet are overlapped, at least one of the electrode sheet and the tape portion, and a fixing step of fixing the separator sheet,
The method for manufacturing a wound body according to claim 9, further comprising: a sheet cutting step of cutting the tape portions and the separator sheets in a stacked state at a time in the fixing state in the fixing step. The winding device is
A plurality of the cores;
A turret that is rotatable about its own central axis as a rotation axis, and has a plurality of winding cores arranged at predetermined intervals in its rotation direction;
Each core has a slit through which the electrode sheet and the separator sheet can be inserted;
After winding each electrode sheet and the separator sheet for a predetermined length with respect to the first core in the first position among the plurality of cores, the turret is rotated, and the first core is moved to the second position. A core moving step for moving the second core different from the first core to the first position,
The electrode sheet and the separator sheet arranged from the first core positioned at the second position to the respective supply sources of the electrode sheet and the separator sheet are positioned at the second position. A slit insertion step for inserting the slit into the slit of the core;
After the separator sheet and each tape portion are cut in the sheet cutting step, a termination portion winding step of winding the termination portion of the separator sheet and the termination portion of each electrode sheet by the first core. Including
In the winding step, after the insertion of the electrode sheets and the separator sheet into the slits of the second core in the slit insertion step, the electrode sheets by the first core located at the second position And by winding the separator sheet, the tape portions connecting the electrode sheets are arranged between the first core and the second core in a state of overlapping each other,
In the fixing step, at least one of the electrode sheet and the tape portion, and the separator in the slit of the second core in a state where the tape portions and the separator sheet are overlapped with each other. Secure the seat,
In the sheet cutting step, in the slit of the second core, at least one of the electrode sheet and the tape portion, and the separator sheet is fixed, and the first core is moved from the first core. The method for manufacturing a wound body according to claim 9 or 10, wherein the separator sheet and the tape portions arranged over a two-core are cut at a time. The electrode sheet is configured such that a positive electrode sheet having a positive electrode active material on the surface and a negative electrode sheet having a negative electrode active material on the surface are wound by the core.
The gap between the upstream portion and the downstream portion of the positive electrode sheet is larger than the gap between the upstream portion and the downstream portion of the negative electrode sheet when the protective tape is applied in the sheet connecting step. The method for manufacturing a wound body according to any one of claims 9 to 11, wherein the length is also increased. The tape portion is located between an upstream portion and a downstream portion of the electrode sheet, and a single connecting tape connected to the upstream portion and the downstream portion of the electrode sheet by the protective tape. Prepared,
In the sheet connecting step, the upstream side portion of the electrode sheet and the back and front surfaces of one end portion of the connecting tape, and the downstream side portion of the electrode sheet and the back and front surfaces of the other end portion of the connecting tape, respectively. The protective tape is affixed, and the upstream portion and the downstream portion of the electrode sheet are connected by the tape portion including the protective tape and the connecting tape. The manufacturing method of the winding body as described in claim | item.   The winding according to any one of claims 9 to 13, wherein the cutting of the electrode sheet in the electrode sheet cutting step and the formation of the threading portion in the threading portion forming step are performed at a time. Body manufacturing method.

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