JP2011165336A - Battery manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery manufacturing device which improves productivity of a battery. <P>SOLUTION: The battery manufacturing device includes a tab welding device 6 for welding a tab Tb on an electrode sheet 1, and tape adhering devices 7, 8 for adhering a protection tape Tp on the electrode sheet 1. The tap adhering devices 7, 8 include driven rollers 7a, 8a which are driven in synchronization with conveyance of the electrode sheet 1 after the tab Tb is welded, and hold the protection tape Tp. Then, when the driven rollers 7a, 8a rotate in accordance with the conveyance of the electrode sheet 1 after the tab Tb is welded, the protection tape Tp is adhered on the electrode sheet 1 during conveyance without sensing the electrode sheet 1 again after the tab Tb is welded and stopping for positioning. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a battery manufacturing apparatus used in manufacturing a secondary battery such as a lithium ion battery.

  For example, a secondary battery such as a lithium ion battery is wound in a state where a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material are overlapped via a separator sheet made of an insulating material. Rotated and manufactured.

  In both the positive and negative electrode sheets, a tab is welded to the active material uncoated portion and a protective tape for protecting the tab is attached to the positive and negative electrode sheets before the winding (see, for example, Patent Document 1).

JP 2002-110148 A

  However, since there are some variations in the application interval of the active material on the electrode sheet, conventionally, the boundary part between the active material application part and the non-application part on the electrode sheet is detected by a sensor, and the boundary part is used as a reference. The position for welding the tab was positioned at the position of the welding apparatus. As a result, the distance between the welded tabs varies, so when applying the protective tape to the position of the tab, the position of the tab or the boundary part is detected again and the protection is performed based on the position. It was necessary to position the tape application position at the position of the application device.

  In other words, conventionally, in addition to the positioning process at the time of tab welding, a re-positioning process at the time of attaching the protective tape is required, which has been an impediment to increasing the speed of the manufacturing apparatus and thus improving the productivity of the battery.

  As a method of applying the protective tape without sensing and stopping positioning of the electrode sheet again after the tab welding, for example, the electrode sheet is not conveyed after the tab welding and the protective tape is continuously applied until the protective tape is applied. A method or a method of applying a protective tape at another position where tab welding has already been performed during tab welding at a predetermined position can be considered.

  However, the former method requires a mechanism that alternately moves the tab welding device and the tape applicator in accordance with the tab welding position on the stopped electrode sheet, compared with the configuration in which the electrode sheet side is moved and positioned. There is concern about the complexity and size of the device.

  Further, the application interval of the active material application portion on the electrode sheet is generally about 500 mm to 900 mm, which varies greatly depending on the type of battery. For this reason, when the latter method is adopted, a mechanism for moving the tape applicator greatly along the sheet conveying direction (for example, 400 mm) is required more than the former in order to ensure versatility that can correspond to various products. It becomes.

  The present invention has been made in view of the above circumstances, and has as one of its main purposes to provide a battery manufacturing apparatus capable of improving battery productivity.

  Hereinafter, each means suitable for solving the above-described problem will be described separately. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. In manufacturing a battery by winding an electrode sheet coated with an electrode material at a predetermined interval, a battery manufacturing apparatus for welding a tab to the electrode sheet and attaching a protective tape for protecting the tab,
Conveying means for conveying the electrode sheet;
Detection means capable of detecting a boundary portion between the electrode material application part and the electrode material non-application part in the electrode sheet conveyed by the conveyance means;
A sheet positioning means for positioning and stopping the predetermined position of the electrode sheet at the first position in the sheet conveying direction based on the detection result of the detection means;
Tab welding means for welding the tab to the electrode sheet at the first position in the sheet conveying direction;
Driven in synchronism with the conveyance of the electrode sheet after the tab welding at the second position in the sheet conveyance direction, which is a predetermined length downstream from the first position in the sheet conveyance direction, and protects the electrode sheet being conveyed A battery manufacturing apparatus comprising a tape applying means capable of applying a tape.

  According to the above means 1, by providing the tape applying means that is driven in synchronism with the conveyance of the electrode sheet, the protective tape is applied to the electrode sheet being conveyed without sensing and stopping the electrode sheet again after the tab welding. Can be affixed. As a result, it is possible to increase the speed of the manufacturing apparatus and thus improve the productivity of the battery.

  Further, according to this means, it is possible to omit the detection means and positioning means for positioning the electrode sheet after tab welding, and it is also necessary to provide a large-scale mechanism for moving the tab welding means and the tape applying means. Absent. As a result, it is possible to simplify and reduce the size of the manufacturing apparatus and to reduce the cost.

  Furthermore, in this means, the distance from the tab welding position (first position in the sheet conveyance direction) to the tape application position (second position in the sheet conveyance direction) is independent of the type of product to be manufactured (application interval of the electrode material application part). Always constant. For this reason, without moving a tape sticking means along a sheet conveyance direction, it can respond to various products from which an application interval of an electrode material application part on an electrode sheet differs greatly, and versatility is high.

  Mean 2. 2. The battery manufacturing apparatus according to claim 1, wherein the tape sticking unit includes a rotating body configured to hold the protective tape and configured to be rotatable in synchronization with conveyance of the electrode sheet. .

  According to the said means 2, the structure which drives synchronously with conveyance of an electrode sheet, and affixes a protective tape with respect to the electrode sheet in conveyance can be implement | achieved by a comparatively simple structure. As a result, the manufacturing apparatus can be further simplified. Examples of the rotating body include a roller and a belt.

  Means 3. 3. The battery manufacturing apparatus according to claim 2, wherein the rotating body rotates following the electrode sheet.

  “Following” here refers to an operation that moves in synchronization with the conveyance of the electrode sheet by contact (friction) with the electrode sheet.

  According to the means 3, a complicated mechanism for rotating the rotating body in synchronization with the conveyance of the electrode sheet is not required, and the manufacturing apparatus can be further simplified.

Means 4. The rotation from the first position in the rotational direction where the rotating body holds the protective tape during welding of the tab (when the electrode sheet is stopped) to the second position in the rotational direction where the rotating body is in contact with the electrode sheet The distance on the outer surface of the body is
4. The battery manufacturing apparatus according to claim 2, wherein the battery manufacturing apparatus has the same distance (the predetermined length) from the first position in the sheet conveying direction to the second position in the sheet conveying direction.

  According to the means 4, the tab welded at the first position in the sheet conveying direction is conveyed to the second position in the sheet conveying direction (contact position with the rotating body) by the subsequent conveyance of the electrode sheet. By rotating the rotating body in synchronization with the conveyance of the electrode sheet after welding, the protective tape held at the first position in the rotation direction is carried to the second position in the rotation direction (contact point position with the electrode sheet), corresponding to the tab A protective tape is affixed to the position where

  Means 5. The battery manufacturing apparatus according to any one of means 2 to 4, wherein the protective tape is held by the rotating body that is stopped during welding of the tab.

  According to the means 5, it is not necessary to slow down or stop the rotation (conveyance of the electrode sheet) of the rotating body only for holding the protective tape on the rotating body. Etc. can be achieved. In addition, since the protective tape can be held in the rotating body in a more appropriate state as compared with the configuration in which the rotating tape is held by the rotating body during the rotating operation of the rotating body, it is possible to suppress deterioration in battery quality. it can.

  Means 6. The battery manufacturing apparatus according to any one of means 1 to 5, further comprising two tape applying means corresponding to both the front and back surfaces of the electrode sheet.

  According to the above means 6, since the protective tape can be stuck so as to sandwich the tab from both the front and back surfaces of the electrode sheet, a battery having better durability can be manufactured.

It is the schematic which shows the structure of a battery manufacturing apparatus. (A) is a plane schematic diagram which shows the structure of an electrode sheet, (b) is a side surface schematic diagram which shows the structure of the electrode sheet at the time of sticking a protective tape only on the surface, (c) is front and back It is a side surface schematic diagram which shows the structure of the electrode sheet at the time of sticking a protective tape on both surfaces. It is a schematic diagram which shows the principal part of the electrode sheet conveyance mechanism at the time of tab welding. It is a schematic diagram which shows the principal part of the electrode sheet conveyance mechanism in the sheet conveyance process after tab welding. It is a schematic diagram which shows the principal part of the electrode sheet conveyance mechanism in the sheet conveyance process after tab welding. It is a schematic diagram which shows the principal part of the electrode sheet conveyance mechanism in the sheet conveyance process after tab welding. It is a figure which shows the principal part of the electrode sheet conveyance mechanism which concerns on another embodiment.

  Hereinafter, an embodiment will be described with reference to the drawings. First, an outline of the battery manufacturing apparatus 30 will be described with reference to FIG.

  The battery manufacturing apparatus 30 includes an electrode sheet conveyance mechanism 31 that conveys a negative electrode sheet, an electrode sheet conveyance mechanism 32 that conveys a positive electrode sheet, and separator sheet conveyance mechanisms 33 and 34 that convey separator sheets. The sheets conveyed by the sheet conveying mechanisms 31 to 34 are wound so that the sheets overlap each other in the sheet winding unit 35, whereby a battery such as a lithium ion secondary battery is manufactured.

  As shown in FIGS. 2A to 2C, the electrode sheet 1 (positive electrode sheet and negative electrode sheet) conveyed by the electrode sheet conveying mechanisms 31 and 32 has an active material as an electrode material at predetermined intervals in advance. A metal sheet 20 coated with 21 is used. Specifically, for example, an aluminum foil sheet is used as the positive electrode sheet, and the positive electrode active material is applied to both the front and back surfaces at regular intervals. For example, a copper foil sheet is used as the negative electrode sheet, and the negative electrode active material is applied to both the front and back surfaces at regular intervals. In addition, a tab Tb is welded to a predetermined position of the active material uncoated portion 22, and a protective tape Tp is attached so as to sandwich the tab from both the front and back surfaces.

  Next, the electrode sheet conveyance mechanisms 31 and 32 will be described in detail. In addition, since both the electrode sheet conveyance mechanisms 31 and 32 are the same structures, here, the electrode sheet conveyance mechanism 31 which concerns on a negative electrode sheet is mentioned as an example, and is demonstrated. Hereinafter, the negative electrode sheet is appropriately referred to as an electrode sheet 1.

  In the electrode sheet conveyance mechanism 31, the electrode sheet 1 is sent to the downstream side by a predetermined amount by the pair of pinch rollers 11 provided on the upstream side of the sheet winding unit 35. Following this, new electrode sheets 1 are supplied from the electrode sheet roll 2 by a predetermined amount.

  The pinch roller 11 constitutes a conveying unit and a sheet positioning unit in the present embodiment, and also has a function of appropriately adjusting the conveying amount of the electrode sheet 1 and positioning the electrode sheet 1 at a predetermined position.

  The electrode sheet 1 drawn out from the electrode sheet roll 2 is first sent to a position below a detection sensor 4 as detection means via a traveling roller 3a and a tension roller 3b. The detection sensor 4 detects a boundary portion D between the active material application part (electrode material application part) 21 and the active material non-application part (electrode material non-application part) 22 on the electrode sheet 1.

  On the downstream side of the detection sensor 4, a tab welding device 6 as a tab welding means is disposed. The tab welding device 6 welds the tab Tb to the active material uncoated portion 22 on the electrode sheet 1.

  Further, on the downstream side of the tab welding device 6, a first tape applying device 7 is disposed corresponding to the back surface of the electrode sheet 1, and further on the downstream side, a second corresponding to the surface of the electrode sheet 1. A tape applicator 8 is provided. The tape applicators 7 and 8 constitute a tape applicator in the present embodiment and have a function of applying a protective tape Tp for protecting the welded tab Tb.

  The tape applicators 7 and 8 include driven rollers 7a and 8a as rotating bodies that rotate following the electrode sheet 1, respectively, and press rollers 7b and 8b that press against the driven rollers 7a and 8a.

  As shown in FIG. 3, the driven rollers 7a and 8a and the presser rollers 7b and 8b are separated from the tab welding position F3 by a predetermined length L1 and L2 along the sheet conveying direction S1 (see FIG. 4). Further, they are arranged so as to be in contact with the electrode sheet 1 at the tape application positions F4 and F5. In the present embodiment, the tab welding position F3 corresponds to the first position in the sheet conveyance direction, and the tape application positions F4 and F5 correspond to the second position in the sheet conveyance direction.

  Usually, the driven rollers 7 a and 8 a and the pressing rollers 7 b and 8 b are not in contact with the electrode sheet 1.

  The presser rollers 7b and 8b are configured to be movable up and down. The presser rollers 7b and 8b are in pressure contact with the driven rollers 7a and 8a via the electrode sheet 1, so that the driven rollers 7a and 8a are electrode sheets. 1 can be rotated.

  A tape holder (not shown) for holding the protective tape Tp is provided at a predetermined position on the outer peripheral surface of the driven rollers 7a and 8a. The tape holding portion is formed with a suction hole communicating with a predetermined suction device. By adsorbing the protective tape Tp through the suction hole, it is possible to hold the protective tape Tp on the outer peripheral surface of the driven rollers 7a and 8a that are rotating.

  Further, the driven rollers 7a and 8a are urged in a direction opposite to the rotation directions S2 and S3 (see FIG. 4 and the like) by a spring mechanism or the like (not shown), and have a reference posture in a normal state without contact with the electrode sheet 1. It is configured to take. When the driven rollers 7a, 8a are in the reference posture, the tape holding portion is at a reference position A2, which is 180 ° opposite to the sheet contact positions A1, B1 facing the electrode sheet 1 with respect to the rotation directions S2, S3. Located at B2. In the present embodiment, the reference positions A2 and B2 of the tape holding unit correspond to the first position in the rotation direction, and the sheet contact positions A1 and B1 correspond to the second position in the rotation direction.

  Here, the half circumferences of the driven rollers 7a, 8a (distances on the outer peripheral surface of the driven rollers 7a, 8a from the reference positions A2, B2 of the tape holding portion to the sheet contact positions A1, B1) are respectively tabs. It is set to be equal to the distances L1 and L2 from the welding position F3 to the tape application positions F4 and F5.

  Next, the welding process of the tab Tb to the electrode sheet 1 and the sticking process of the protective tape Tp performed by the battery manufacturing apparatus 30 will be described in detail.

  First, the position of the boundary part D between the active material application part 21 and the active material non-application part 22 on the electrode sheet 1 is detected by the detection sensor 4.

  Then, the pinch roller 11 conveys and stops the electrode sheet 1 by a predetermined amount according to the detection result of the detection sensor 4. Thereby, the predetermined position on the active material non-application part 22 will be in the state aligned with the tab welding position F3.

  At the tab welding position F3, the tab welding device 6 welds the tab Tb at a predetermined position on the active material uncoated portion 22 (see FIG. 3).

  During welding of the tab Tb, preparation of the protective tape Tp used in the subsequent process is also performed at the same time. More specifically, the protective tape Tp is supplied from a tape supply mechanism (not shown) to the tape holding portions of the driven rollers 7a and 8a stopped in the reference posture. Here, the protective tape Tp is adsorbed and held on the outer peripheral surfaces of the driven rollers 7a and 8a with the adhesive surface facing outward.

  Further, during the welding of the tab Tb, the presser rollers 7b and 8b are driven to press-contact with the driven rollers 7a and 8a through the electrode sheet 1, respectively.

  When the welding of the tab Tb is completed, the feeding operation is executed by the pinch roller 11 and the electrode sheet 1 is conveyed. Following this, the driven rollers 7a and 8a also rotate (see FIG. 4). Then, when the tab Tb welded at the tab welding position F3 is conveyed to the tape application position F4, the driven roller 7a is also rotated by the half circumference K1 (180 °), and the tape holding portion at the reference position A2. The protective tape Tp held in (1) is conveyed to the sheet contact position A1 (see FIG. 5). As a result, the protective tape Tp is affixed to the back surface of the electrode sheet 1 corresponding to the position where the tab Tb is welded without stopping the conveyance of the electrode sheet 1.

  Here, since the adhesive force of the protective tape Tp is superior to the attractive force of the suction device, complicated control that temporarily stops the suction by the suction device is performed when the protective tape Tp is applied. The protective tape Tp is smoothly applied to the electrode sheet 1.

  After the tab Tb passes the tape application position F4, the press roller 7b is separated from the electrode sheet 1. As a result, the driven roller 7a is returned to the reference posture by an urging force of a spring mechanism or the like.

  When the electrode sheet 1 is further conveyed and the welded tab Tb is conveyed to the tape application position F5, the driven roller 8a is also rotated by a half circumference K2 (180 °), and the protective tape Tp contacts the sheet. It is carried to position B1 (see FIG. 6). As a result, the protective tape Tp is applied to the tab Tb on the surface side of the electrode sheet 1 without stopping the conveyance of the electrode sheet 1 as in the case of application at the tape application position F4.

  After the tab Tb passes the tape application position F5, the press roller 8b is separated from the electrode sheet 1. As a result, the driven roller 8a is returned to the reference posture by an urging force of a spring mechanism or the like.

  When the tab Tb welding process and the protective tape Tp attaching process are completed through the above-described processes, the electrode sheet 1 to which the tab Tb and the protective tape Tp are attached finally has the traveling roller 10 and the pinch roller 11. Then, the sheet is conveyed to the sheet winding unit 35. A cutter 12 is provided between the pinch roller 11 and the sheet take-up portion 35 to cut the electrode sheet 1 with a predetermined length necessary for manufacturing one battery. The electrode sheet 1 is wound around the sheet winding portion 35.

  As described above in detail, according to the present embodiment, by providing the driven rollers 7a and 8a that are driven in synchronization with the conveyance of the electrode sheet 1, the electrode sheet 1 is sensed again after the tab Tb is welded and the positioning is stopped. The protective tape Tp can be affixed to the electrode sheet 1 that is being transported without causing it to occur. As a result, it is possible to increase the speed of the battery manufacturing apparatus 30 and improve the battery productivity.

  Further, it is possible to omit a detection sensor and a positioning mechanism for positioning the electrode sheet 1 after welding of the tab Tb, and it is necessary to provide a large-scale mechanism for moving the tab welding device 6 and the tape applying devices 7 and 8. Nor. As a result, the battery manufacturing apparatus 30 can be simplified, downsized, and cost can be reduced.

  Furthermore, in this embodiment, the distances L1 and L2 from the tab welding position F3 to the tape application positions F4 and F5 are always constant regardless of the type of battery to be manufactured (application interval of the active material application part 21). For this reason, without moving the tape applicators 7 and 8 along the sheet conveyance direction S1, it is possible to deal with various products in which the application interval of the active material application part 21 on the electrode sheet 1 is greatly different. Is expensive.

  In addition, in the present embodiment, the protection tape Tp is held by the stopped driven rollers 7a and 8a during welding of the tab Tb. For this reason, it is not necessary to slow down or stop the rotation speed (conveyance of the electrode sheet 1) of the driven rollers 7a, 8a just to hold the protective tape Tp on the driven rollers 7a, 8a. Productivity can be improved. In addition, the protective tape Tp can be held on the driven rollers 7a and 8a in a more appropriate state as compared with the configuration in which the driven rollers 7a and 8a hold the protective tape Tp during the rotation of the driven rollers 7a and 8a. Therefore, it is possible to suppress the deterioration of the battery quality.

  In addition, you may implement as follows, for example, without being limited to the description content of embodiment mentioned above.

  (A) In the said embodiment, although the driven rollers 7a and 8a are employ | adopted as a tape sticking means, not only this but another structure may be employ | adopted.

  For example, as shown in FIG. 7, belt mechanisms 17 and 18 may be employed instead of the driven rollers 7a and 8a. Each of the belt mechanisms 17 and 18 includes a pair of rollers 17a and 18a, and belts 17b and 18b as rotating bodies that are hung between the pair of rollers 17a and 18a. Then, the belts 17b and 18b follow the conveyed electrode sheet 1 and apply the protective tape Tp.

  When the belt mechanisms 17 and 18 are employed, even when the distances L1 and L2 from the tab welding position F3 to the tape application positions F4 and F5 are increased, it is not necessary to increase the width with respect to the sheet conveying direction S1. An increase in the size of the manufacturing apparatus can be suppressed.

  Of course, the tape sticking means is not limited to the driven type, and any other configuration may be adopted as long as it is driven in synchronization with the conveyance of the electrode sheet 1.

  For example, in the above embodiment, the press rollers 7b and 8b are omitted, and the driven rollers 7a and 8a are not in contact with the electrode sheet 1 but are moved in conjunction with the conveyance mechanism of the electrode sheet 1, such as the pinch roller 11. May be.

  (B) In the said embodiment, although it has the structure provided with the two tape sticking apparatuses 7 and 8 corresponding to the front and back both surfaces [refer FIG.2 (c)] of the electrode sheet 1, it is not restricted to this, For example, It is good also as a structure provided with only one tape sticking apparatus 7 corresponding to only the surface side of the electrode sheet 1 (refer FIG.2 (b)).

  (C) In the above embodiment, the two tape applicators 7 and 8 are provided at different positions F4 and F5 in the sheet conveying direction S1, respectively. It is good also as a structure which provides a sticking apparatus and sticks the protective tape Tp to the electrode sheet 1 simultaneously front and back.

  (D) The configuration for maintaining the driven rollers 7a and 8a in the reference posture is not limited to the spring mechanism of the above embodiment. For example, a configuration in which the protective tape Tb is applied and then returned to the reference posture by a driving unit such as a motor, or a configuration in which the driven rollers 7a and 8a that move by inertia are stopped by a magnet or the like may be employed.

  (E) In the above embodiment, the protection tape Tp is held by the stopped driven rollers 7a and 8a during the welding of the tab Tb. Not only this but the structure which makes the follower rollers 7a and 8 in rotation operation hold | maintain the protective tape Tp is good. For example, after welding of the tab Tb, the protective tape is aligned with the timing at which the tab Tb reaches the tape application positions F4 and F5 with respect to the driven rollers 7a and 8a that are rotated following the conveyed electrode sheet 1. It is good also as a structure which delivers Tp.

  (F) In the above embodiment, the half circumference of the driven rollers 7a, 8a (distance on the outer peripheral surface of the driven rollers 7a, 8a from the reference position A2, B2 of the tape holding portion to the sheet contact position A1, B1) K1, K2 is set to be equal to the distances L1 and L2 from the tab welding position F3 to the tape application positions F4 and F5, respectively, and simultaneously with the start of conveyance of the electrode sheet 1 after welding of the tab Tb, the driven rollers 7a and 8a The configuration is such that follow-up is started. Not limited to this, for example, by pressing the pressing rollers 7b and 8b after a predetermined time from the start of conveyance of the electrode sheet 1 after welding of the tab Tb, the timing at which the tab Tb reaches the tape application positions F4 and F5 is reached. In addition, the driven rollers 7a and 8a may be driven. According to such a configuration, the diameters of the driven rollers 7a and 8a can be set to be relatively small.

  DESCRIPTION OF SYMBOLS 1 ... Electrode sheet, 4 ... Detection sensor, 6 ... Tab welding apparatus, 7, 8 ... Tape sticking apparatus, 7a, 8a ... Follower roller, 7b, 8b ... Pressing roller, 11 ... Pinch roller, 21 ... Active material application part, 22 ... Active material uncoated part, 30 ... Battery manufacturing device, 31, 32 ... Electrode sheet conveying mechanism, A1, B1 ... Sheet contact position of tape holding part, A2, B2 ... Reference position of tape holding part, D ... Boundary part F3: Tab welding position, F4, F5: Tape application position, L1, L2: Distance from tab welding position to tape application position, K1, K2: Half circumference of driven roller, Tb: Tab, Tp: Protection tape.

Claims (6)

In manufacturing a battery by winding an electrode sheet coated with an electrode material at a predetermined interval, a battery manufacturing apparatus for welding a tab to the electrode sheet and attaching a protective tape for protecting the tab,
Conveying means for conveying the electrode sheet;
Detection means capable of detecting a boundary portion between the electrode material application part and the electrode material non-application part in the electrode sheet conveyed by the conveyance means;
A sheet positioning means for positioning and stopping the predetermined position of the electrode sheet at the first position in the sheet conveying direction based on the detection result of the detection means;
Tab welding means for welding the tab to the electrode sheet at the first position in the sheet conveying direction;
Driven in synchronism with the conveyance of the electrode sheet after the tab welding at the second position in the sheet conveyance direction, which is a predetermined length downstream from the first position in the sheet conveyance direction, and protects the electrode sheet being conveyed A battery manufacturing apparatus comprising a tape applying means capable of applying a tape.   The battery manufacturing method according to claim 1, wherein the tape applying unit includes a rotating body configured to hold the protective tape and configured to be rotatable in synchronization with conveyance of the electrode sheet. apparatus.   The battery manufacturing apparatus according to claim 2, wherein the rotating body is rotated by following the electrode sheet. The distance on the outer peripheral surface of the rotating body from the first position in the rotating direction where the rotating body holds the protective tape during welding of the tab to the second position in the rotating direction where the rotating body contacts the electrode sheet But,
4. The battery manufacturing apparatus according to claim 2, wherein the battery manufacturing apparatus has the same distance from the first position in the sheet conveying direction to the second position in the sheet conveying direction. 5.   5. The battery manufacturing apparatus according to claim 2, wherein the protective tape is held by the stopped rotating body during welding of the tab. 6.   The battery manufacturing apparatus according to any one of claims 1 to 5, further comprising two tape applying means corresponding to both front and back surfaces of the electrode sheet.

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