JP2007184160A - Method of winding battery element, winding device, and winding core for winding battery element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of winding a battery element capable of winding a cathode foil and an anode foil with appropriate positional relation, disusing unnecessary separator serving as a hooking margin. <P>SOLUTION: A terminal part 5a of the cathode foil 5 is transferred up to a prearranged first position I1, and a terminal part 6a of the cathode foil 6 is transferred up to a prearranged second position I2, and the terminal part 6a of the cathode foil 6 is arranged so as to extend from the terminal part 5a of the cathode foil 5 by a distance G. Next, the belt-shaped body 2id pinched by a pinching part 30 of a tube by supplying air to the tube 28 constituting a chuck structure 23. Next, winding of the belt-shaped body is started by starting rotation of a rotation axis of a servo-motor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for obtaining a battery element incorporated in, for example, a secondary battery.

  For example, a battery element used as a secondary battery such as a lithium ion battery is configured by winding a belt-like body composed of a plus electrode foil, a minus electrode foil, and two separators.

2. Description of the Related Art Conventionally, there is a winding device that winds a belt-like body so as to make it easier to remove the wound belt-like body from a winding core (see, for example, Patent Document 1).
JP-A-9-320612

  By the way, in the battery element, the active material is applied to both the front and back surfaces of the plus electrode foil and the minus electrode foil, and ion exchange is performed through the active material. Specifically, ions move from the positive electrode side to the negative electrode side during charging, and conversely, ions move from the negative electrode side to the positive electrode side during discharging.

  Here, when an exposed portion where the active material is not applied, such as an edge portion of the negative electrode foil, is at a position facing the positive electrode foil, a metal (the above lithium ion battery) is applied to the exposed portion of the negative electrode foil during charging. Then lithium) accumulates. Such accumulation of metal becomes a factor that damages the separator and causes a short circuit between the plus electrode foil and the minus electrode foil. Therefore, unlike the capacitor element, the battery element is wound with the edge of the positive electrode foil (winding start position) and the edge of the negative electrode foil (winding start position) shifted by several millimeters to several tens of millimeters. There is a need to.

  In addition, the core for obtaining the battery element has a larger slit width (interval between the core pieces for inserting the strips) than the core for obtaining the capacitor element. The reason for this is that, in a battery element, the separator or the like is relatively thin, and if the slit width is narrow, the separator or the like may be damaged.

  For these reasons, in the prior art, first, the separator is wound around the core, or the separator sandwiched with the negative electrode foil is wound around the core. As a result, after the separator or the like cannot be removed from the winding core (a state in which the separator is caught in the winding direction), the positive electrode foil is inserted at an appropriate position, and further winding is performed. .

  For this reason, an extra separator, which is not related to the capacity performance of the battery element, is wound around the beginning of the winding, resulting in a decrease in capacity performance, and an increase in cost due to the extra winding of the separator. Could occur. Furthermore, since the positive electrode foil is inserted after the separator or the like is wound up to some extent, there is a possibility that the positional accuracy of the positive electrode foil may vary.

  The present invention has been made to solve the above-described problems, and its purpose is to make it possible to wind the plus electrode foil and the minus electrode foil in an appropriate positional relationship, and also to make an extra charge for the hooking cost. It aims at making a separator unnecessary.

  In the following, each means suitable for solving the above-mentioned purpose will be described in terms of items. In addition, the effect etc. peculiar to the means to respond | correspond as needed are added.

Means 1. Using a core having at least two core pieces extending from the base end portion, a belt-like body composed of a plus electrode foil, a minus electrode foil, and first and second separators is disposed between the core pieces. A battery element winding method for inserting and winding the battery element,
A battery element winding method, which is performed through the following steps (1) to (3).

  (1) While inserting the strip | belt body which overlap | superposed in order of the said plus electrode foil, the said 1st separator, the said minus electrode foil, and the said 2nd separator between the said core pieces, the edge of the said plus electrode foil between the said core pieces The edge of the negative electrode foil is projected from the edge by a certain distance.

  (2) By having a holding part for holding the belt-like body and having the holding part protrude between the core pieces by a chuck mechanism capable of protruding and retracting the holding part between the core pieces, Hold the band.

  (3) The winding of the strip is started.

  According to the means 1, the edge portions of the plus electrode foil and the minus electrode foil are arranged at appropriate positions between the core pieces and sandwiched together with the first and second separators, Winding is started.

  Thereby, the plus electrode foil and the minus electrode foil can be wound in an appropriate positional relationship. Further, unlike the prior art, it is not a method of winding only the separator or the separator and the negative electrode foil at the beginning, so that an extra separator as an extra charge becomes unnecessary. As a result, variation in the positional accuracy of the plus electrode foil can be suppressed, and a reduction in capacity performance and an increase in cost of the obtained battery element can be suppressed.

Mean 2. In the battery element winding method according to means 1,
In the procedure (1), the space between the core pieces is horizontal,
The positive electrode foil is placed on the first separator, and the positive electrode foil is also conveyed and supplied by conveying and supplying the first separator, and an edge portion of the positive electrode foil is interposed between the core pieces. The negative electrode foil is placed on the second separator, placed on the second separator, and transported and supplied by transporting and feeding the second separator. A battery element winding method, wherein an edge is disposed at a second position between the core pieces.

  According to the means 2, when the respective edge portions of the plus electrode foil and the minus electrode foil are arranged at appropriate positions between the core pieces, the gap between the core pieces is made horizontal, and the plus electrode foil and the minus electrode are placed on each separator. By placing the foil, the plus electrode foil and the minus electrode foil are conveyed and supplied as the separators are conveyed and supplied. And the edge part of plus electrode foil is arrange | positioned in the 1st position between core pieces, and the edge part of minus electrode foil is arrange | positioned in the 2nd position between core pieces. Thereby, it becomes possible to arrange | position each electrode foil in the appropriate position between core pieces, without being based on a very complicated structure.

Means 3. In the battery element winding method according to Means 1 or 2,
In the step (2), by further causing the clamping mechanism to protrude by the chuck mechanism, the core pieces are moved in a separating direction that is separated from each other, and the diameter of the core in the separating direction is made constant. A method for winding a battery element.

  According to the means 3, the winding of the belt-like body is started in a state where the core piece is moved in the separating direction by projecting the sandwiching portion between the core pieces and the diameter of the core in the separating direction is constant. . Thereby, the plus electrode foil and the minus electrode foil can be reliably wound in an appropriate positional relationship, and the capacity performance of the obtained battery element can be stabilized.

  In addition, “the diameter of the winding core in the separation direction” may mean “the width in the separation direction passing through the rotation center of the winding core” in the meaning including the case where the winding core has a polygonal shape. The same applies to the following means.

Means 4. In the battery element winding method according to means 3,
In the step (2), the battery element winding method is characterized in that the diameter of the core in the separation direction is kept constant by a regulating portion that regulates the movement of the core piece.

  According to the means 4, the winding of the belt-like body is started in a state in which the diameter of the core is kept constant by the regulating portion that regulates the movement of the core piece. As a result, even if the thickness of the belt-like body (according to the thickness of the material constituting the belt-like body) is changed, the diameter of the winding core is kept constant in the separating direction, so that the plus electrode foil and the minus electrode foil Can be wound more reliably in an appropriate positional relationship, and the capacity performance of the obtained battery element can be stabilized.

Means 5. In the battery element winding method according to means 3 or 4,
After the step (3), when the winding of the band-like body is completed, the clamping mechanism is made to be immersed by the chuck mechanism, and the winding core is removed from the band-like body.

  In the means 5, when the winding of the belt-like body is completed, the clamping part is immersed by the chuck mechanism, and the winding core is extracted from the belt-like body. If the clamping part is immersed by the chuck mechanism, the diameter of the core that has been constant can be reduced in the separating direction. Therefore, according to the means 5, the core can be pulled out relatively easily.

  Although the above has been described as the invention of the battery element winding method, it can also be realized as an invention of a battery element winding device.

  Means 6. A winding device used in the battery element winding method according to any one of means 1 to 5.

  According to the winding device of the means 6, the same effects as the effects shown in the means 1 to 5 can be obtained.

Mean 7 A core having at least two core pieces extending from the base end portion, the core being configured to be rotatably supported at least on the base end side, and a belt-like body between the core pieces. A battery element winding device that is inserted and wound,
At least one of the core pieces has a holding part for holding the belt-like body, and has a chuck mechanism capable of causing the holding part to protrude and retract between the core pieces. A battery element winding device.

  The winding device described in the means 7 includes a chuck mechanism in at least one of the core pieces constituting the core. This chuck mechanism has a clamping part for clamping the belt-like body, and the clamping part is caused to protrude and retract between the core pieces by this chuck mechanism.

  Thereby, for example, it becomes possible to place the respective edge portions of the plus electrode foil and the minus electrode foil at appropriate positions between the core pieces and sandwich them together with the first and second separators. The winding of the belt can be started. As a result, the plus electrode foil and the minus electrode foil can be wound in an appropriate positional relationship. In addition, an extra separator that is used as a cost is not required.

Means 8. In the battery element winding device according to means 7,
The battery element winding device according to claim 1, wherein when the clamping portion is protruded by the chuck mechanism, the winding core pieces are moved in a separating direction to be separated from each other.

  According to the means 8, when the clamping part is protruded by the chuck mechanism, the core pieces move in the separating direction in which they are separated from each other. For example, the core piece moves in the separating direction by elastic deformation around the base end portion where the core piece is extended. In this case, the positive electrode foil and the negative electrode foil are appropriately used by starting the winding of the belt-like body in a state where the diameter of the core in the separation direction becomes constant by the movement of the core piece in the separation direction. It is possible to surely wind in a proper positional relationship, and it is possible to stabilize the capacity performance of the obtained battery element. In addition, the insertion of the clamping part by the chuck mechanism enables movement of the core pieces in the proximity direction close to each other and the diameter of the core in the separation direction can be reduced, so that the belt-like body after winding can be removed from the core. Can be easily extracted.

Means 9. In the battery element winding device according to means 8,
A battery element winding device, comprising: a restricting portion that restricts movement of the winding core piece in the separation direction by a predetermined amount or more.

  According to the means 9, since the movement of a predetermined amount or more in the separation direction of the core piece is restricted by the restricting portion, the diameter of the core in the separation direction can be kept constant. Therefore, by starting the winding of the strip in this state, the positive electrode foil and the negative electrode foil can be more reliably wound in an appropriate positional relationship, and the capacity of the obtained battery element The performance can be stabilized.

Means 10. In the battery element winding device according to means 8 or 9,
A battery element winding device comprising biasing means for biasing the winding core pieces in a proximity direction close to each other.

  According to the means 10, since the core pieces are urged in the proximity direction close to each other by the urging means, the movement of the core piece in the proximity direction is derived by the immersion of the clamping portion by the chuck mechanism, and the winding in the separation direction is derived. Since the diameter of the core is reduced, the strip-shaped body after winding can be further easily extracted.

Means 11. In the battery element winding device according to any one of means 6 to 10,
The battery element winding device according to claim 1, wherein an outer edge shape of a cross section of the core formed by each cross section of the core piece is substantially circular.

  According to the means 11, since the outer edge shape of the cross section of the core is substantially circular, the supply speed of the belt-like body at the time of winding can be made substantially constant. For example, the cross section of the core is polygonal Compared to the case, the time required for winding the belt-like body can be shortened. As a result, the productivity of battery elements can be improved.

Means 12. In the battery element winding device according to means 11,
The winding core is composed of two winding core pieces, a first winding core piece and a second winding core piece, and arc lengths in cross sections of the first and second winding core pieces constituting the substantially circular outer edge are substantially equal. A battery element winding device characterized by comprising:

  According to the means 12, the lengths of the arcs in the cross sections of the first and second core pieces constituting the substantially circular outer edge are substantially equal, and therefore, the insertion work of the belt-like body at the beginning of winding becomes easy. As a result, it contributes to the improvement of the productivity of battery elements.

Means 13. In the battery element winding device according to means 11,
The winding core is composed of two winding core pieces, a first winding core piece and a second winding core piece, and the lengths of arcs in the cross sections of the first and second winding core pieces constituting the substantially circular outer edge are different. A battery element winding device.

  According to the means 13, the lengths of the arcs in the cross sections of the first and second core pieces constituting the substantially circular outer edge are different, that is, one of the core pieces is relatively large (thick). Therefore, if a chuck mechanism is provided on the core piece, there is a high possibility that a sufficient accommodation space can be secured, and the chuck mechanism can be provided relatively easily.

  The above has been described as an invention of a winding method and a winding device, but can also be realized as an invention of a winding core structure for winding a battery element.

Means 14. A core structure for winding a battery element, having at least two core pieces extending from a base end portion, for winding a band-shaped body by passing between the core pieces,
At least one of the core pieces has a holding part for holding the belt-like body, and has a chuck mechanism capable of causing the holding part to protrude and retract between the core pieces. A core structure for winding the battery element.

  According to the means 14, the same effects as the winding device described in the means 7 can be obtained.

Means 15. In the core structure according to means 14,
A core structure for winding a battery element, wherein the core piece is configured to move in a separating direction in which the core pieces are separated from each other when the clamping portion is projected by the chuck mechanism.

  According to the means 15, the same effect as the winding device described in the means 8 is obtained.

Means 16. In the core structure according to means 14 or 15,
A core structure for winding a battery element, wherein an outer edge shape of a cross section constituted by each cross section of the core piece is substantially circular.

  According to the means 16, the same effect as the winding device described in the means 11 can be obtained.

Means 17. In the core structure according to means 16,
It has two core pieces, the first core piece and the second core piece, and the arc lengths in the cross sections of the first and second core pieces constituting the substantially circular outer edge are substantially equal. A winding core structure for winding a battery element.

  According to the means 17, the same operational effects as the winding device described in the means 12 can be obtained.

Means 18. In the core structure according to means 16,
It has two core pieces, a first core piece and a second core piece, and the arc lengths in the cross sections of the first and second core pieces constituting the substantially circular outer edge are different. A winding core structure for winding a battery element.

  According to the means 18, the same effect as the winding device described in the means 13 can be obtained.

Means 19. In the core structure according to any one of means 14 to 18,
The clamping part is constituted by a tube,
The core structure for winding a battery element, wherein the chuck mechanism includes an air supply / discharge mechanism capable of supplying air into the tube and discharging air in the tube.

  According to the means 19, the clamping part of the chuck mechanism is constituted by a tube. The chuck mechanism includes an air supply / discharge mechanism that can supply air into the tube and discharge air in the tube. Accordingly, the chuck mechanism can be provided in a relatively small space, and the chuck mechanism can be configured relatively easily.

  Hereinafter, an embodiment will be described with reference to the drawings.

  First, the structure of the lithium ion battery element obtained by the winding device of this embodiment will be described. As shown in FIG. 7, the battery element 1 is configured by a wound body around which the belt-like body 2 is wound. In FIG. 7, the battery element 1 has a substantially circular shape, but when the battery element 1 is commercialized as a lithium ion battery, the battery element 1 is flattened. The strip 2 is composed of two separators 3, 4, plus electrode foil 5 and minus electrode foil 6. The separators 3 and 4 are made of an insulator so as to prevent different types of electrode foils 5 and 6 from coming into contact with each other and causing a short circuit. Here, the separator 4 in the present embodiment corresponds to a “first separator”, and the separator 3 corresponds to a “second separator”. An active material is applied to both the front and back surfaces of the plus electrode foil 5 and the minus electrode foil 6 (not shown), and ion exchange is possible between the electrode foils 5 and 6 through this active material. That is, ions move from the positive electrode foil 5 side to the negative electrode foil 6 side during charging, and on the contrary, ions move from the negative electrode foil 6 side to the positive electrode foil 5 side during discharging.

  Here, in the battery element 1, when an exposed portion to which the active material is not applied, such as the edge 6 a of the negative electrode foil 6, is located at a position facing the positive electrode foil 5, for example, a positive electrode at a position indicated by a symbol S or the like When the foil 5 is disposed, metal (lithium in the present embodiment) is accumulated on the edge portion 6 a of the negative electrode foil 6. Such accumulation of metal leads to damage to the separators 3 and 4 and causes a short circuit between the plus electrode foil 5 and the minus electrode foil 6.

  Therefore, in the battery element 1, the edge 6 a of the negative electrode foil 6 protrudes by a distance G (for example, 10 mm) with respect to the edge 5 a of the positive electrode foil 5 at the winding start position. .

  Next, the winding device 10 for manufacturing the battery element 1 according to FIGS. 1 to 4 will be described. The winding device 10 includes a rotation drive unit 12 and a support unit 13, and a winding core 14 is rotatably supported by both the units 12 and 13.

  FIG. 1 is a plan view schematically showing the entire winding device 10, and FIG. 2 is a partial side view schematically showing the rotary drive unit 12 shown in FIG. As shown in these drawings, the rotary drive unit 12 of the winding device 10 includes a servo motor that constitutes a drive source (not shown), and can rotate as the drive shaft of the servo motor rotates. A shaft 15 is provided. A substantially disc-shaped mounting flange 16 is integrally provided at the tip of the rotating shaft 15. A pair of mounting arms 17 are integrally formed on the mounting flange 16 so as to protrude toward the tip side (left side in the figure). The base end portions 17a of the pair of mounting arms 17 are relatively thin by cutting out the central portion, and the mounting arms 17 are moved toward and away from each other by elastic deformation of the base end portions 17a. It is movable. Each mounting arm 17 is connected to an end portion of a spring 18 as “biasing means”, and the spring 18 pulls each mounting arm 17 in the proximity direction. Moreover, as shown in FIG. 2, both the front surface 17b and the back surface 17c of each attachment arm 17 are flat surfaces.

  In this embodiment, the core 14 is attached to each of the attachment arms 17. More specifically, the core 14 is composed of two core pieces 14A and 14B, and the base 21 of each core piece 14A and 14B is attached to the mounting arm 17 (see FIG. 2). That is, a flat surface 21a corresponding to the back surface 17c of the mounting arm 17 is formed on the base portion 21 of the winding core pieces 14A, 14B, and the core pieces 14A, 14A, 14B are formed by bolts 19 penetrating both surfaces 17b, 17c of the mounting arm 17. The base 21 of 14 </ b> B is screwed and fixed to the mounting arm 17. Under such a configuration, the rotary shaft 15 is rotated in accordance with the rotational drive of the drive shaft of the servo motor, whereby the core 14 is rotated. Each of the core pieces 14A and 14B includes a main body portion 22 continuous with the base portion 21, and a chuck mechanism 23 (tube 28) is provided on the main body portion 22 of the one core piece 14A. Furthermore, as described above, since the pair of mounting arms 17 can move in the direction of contact with each other, the two core pieces 14A and 14B attached to each mounting arm 17 are also connected to the base of the mounting arm 17. Due to the elastic deformation of the end portions 17a, they can move toward and away from each other.

  In FIG. 2, the side surface on the one core piece 14A side is shown, but the basic structure and the like are the same for the other core piece 14B.

  Next, a cross-sectional structure of the core 14 (a cross-sectional structure of the main body portion 22 of the core pieces 14A and 14B) will be described. FIG. 3 shows an end surface taken along line AA of FIG.

  As shown in the figure, the core pieces 14A and 14B include circumferential surfaces 24 and 25 and opposing surfaces 26 and 27, respectively. Here, the lengths of the arcs indicating the outer edges of the circumferential surfaces 24 and 25 are equal in the respective core pieces 14A and 14B. An accommodation recess 26a for accommodating the chuck mechanism 23 is formed on the facing surface 26 of the one core piece 14A. The housing recess 26a extends in the longitudinal direction of the core piece 14A (direction perpendicular to the paper surface).

  The chuck mechanism 23 housed in the housing recess 26a includes a tube 28 having a substantially hexagonal cross section and a space inside, and an air supply / discharge mechanism (not shown). The upper part of the tube 28 is an adhesive part 29 in the figure, and this adhesive part 29 is adhered to the recess 26a of the core piece 14A. Further, the tube 28 has a sandwiching portion 30 at the lower portion in the figure, and the sandwiching portion 30 is disposed so as to face the facing surface 27 of the other core piece 14B. An air supply mechanism (not shown) is connected to the tube 28 so that air can be supplied to the internal space of the tube 28 and discharged from the internal space. As a result, the tube 28 expands when air is supplied to the internal space thereof, and causes the holding portion 30 to protrude from the concave portion 26a of the one core piece 14A (hereinafter referred to as a chuck protruding state). Further, the tube 28 is contracted by discharging the air in the internal space, and the sandwiching portion 30 is immersed in the concave portion 26a of the one core piece 14A (hereinafter referred to as a chuck immersion state). With this configuration, as shown in FIG. 3, the belt-like body 2 inserted between the core pieces 14 </ b> A and 14 </ b> B can be sandwiched. In the present embodiment, as shown in FIG. 3, the belt-like body 2 is configured by superposing the plus electrode foil 6, the separator 4, the minus electrode foil 5, and the separator 3 in this order from the tube 28 (chuck mechanism 23) side. .

  Further, as shown in FIG. 4A, in the chuck protruding state, the core piece 14B receives a downward force (indicated by the symbol F1) in the figure from the sandwiching portion 30 via the belt-like body 2, and the core piece 14A receives an upward force (F2 = F1 indicated by a symbol F2) in the figure from the bonding portion 29. Thereby, in the said chuck | zipper protrusion state, each core piece 14A, 14B moves to the direction which mutually spaces apart. As a result, the diameter of the core 14 in the arrangement direction of the core pieces 14A and 14B is larger than D1.

  On the other hand, as shown in FIG. 4B, in the chuck immersion state, the core pieces 14 </ b> A and 14 </ b> B are moved toward each other by the springs 18 provided on the pair of mounting arms 17. As a result, the diameter of the core 14 in the arrangement direction of the core pieces 14A and 14B is D2 (D2 <D1). In this state, a sufficient gap is formed between the core pieces 14A and 14B to allow the strip 2 to be inserted.

  The rotary drive unit 12 is slidable in the longitudinal direction of the core 14 by an actuator such as a cylinder (not shown) so as to allow removal of the battery element 1 after winding.

  Next, the structure of the part corresponding to the support unit 13 in the winding device 10, that is, the tip end side of the core 14 will be described.

  As shown in FIG. 1, the support unit 13 supports the tip end of the core 14 in the accommodated state. Specifically, the support unit 13 includes a rotating shaft 31, and a substantially disc-shaped mounting flange 32 is integrally provided at the tip of the rotating shaft 31. The mounting flange 32 is integrally formed with a mounting portion 33 as a “regulating portion” that is mounted on the tip of the core 14. In the mounting portion 33, a housing portion 33a having a constant diameter D1 is formed in the direction of the rotation shaft 31.

  In the present embodiment, the mounting portion 33 is mounted in a manner that regulates the movement of the core pieces 14A and 14B in the separating direction in the chuck protruding state. Specifically, the tip of the core 14 (the tip of each of the core pieces 14A and 14B) is inserted into the housing portion 33a of the mounting portion 33 by sliding the core 14 in the chuck immersion state in the longitudinal direction. In this state, the belt-like body 2 is inserted between the core pieces 14A and 14B, so that the chuck protrudes. In the chuck protruding state, as described above, the diameter of the core 14 in the arrangement direction of the core pieces 14A and 14B tends to be equal to or greater than D1, but the core pieces 14A and 14B come into contact with the inner surface of the housing portion 33a of the mounting portion 33. Thus, the movement of the core pieces 14A and 14B in the separating direction is restricted, and the tip of the core 14 is held by the mounting portion 33. As described above, since the inner diameter of the accommodating portion 33a is a constant diameter D1, in this state, the diameter of the core 14 in the arrangement direction of the core pieces 14A and 14B is D1, as shown in FIG. The outer edge shape of the cross section of the core 14 is substantially circular.

  The rotation shaft 31 provided in the support unit 13 is supported so as to be driven to rotate. Therefore, in a state where the mounting portion 33 holds the core 14, when the rotary shaft 15 rotates and the core 14 rotates as the drive shaft of the servo motor rotates, the mounting portion 33 rotates accordingly. It is like that.

  Next, a winding method using the winding device 10 will be described.

  First, for example, the core 14 is slid in the longitudinal direction so that the two separators 3 and 4 that can be conveyed and supplied over a roller or the like are inserted between the core pieces 14A and 14B. At this time, the gap between the core pieces 14 </ b> A and 14 </ b> B is set in the horizontal direction, and the tip end portion of the core 14 is inserted into the accommodating portion 33 a of the mounting portion 33.

  Subsequently, the two separators 3 and 4 are conveyed in a certain direction (from the right side to the left side in the figure). Here, the plus electrode foil 5 is placed on one separator 4, and the plus electrode foil 5 is also conveyed and supplied as the separator 4 is conveyed and supplied. The negative electrode foil 6 is placed on the other separator 5, and the negative electrode foil 6 is also transported and supplied as the separator 5 is transported and supplied. With this configuration, as shown in FIG. 5, by transporting one separator 4, the plus electrode foil 5 on the separator 4 is transported and supplied together with the separator 4. Further, by transporting the other separator 3, the negative electrode foil 6 on the separator 3 is transported together with the separator 3 and supplied.

  And as shown in FIG. 5, the edge part 5a of the plus electrode foil 5 is conveyed to the predetermined 1st position I1. Further, as shown in the figure, the edge 6a of the negative electrode foil 6 is conveyed to a predetermined second position I2. As a result, the edge 6 a of the negative electrode foil 6 protrudes from the edge 5 a of the positive electrode foil 5 by the distance G.

  Next, the chuck protruding state is derived by supplying air to the tube 28 constituting the chuck mechanism 23. Thereby, as shown in FIG. 3, the strip | belt-shaped body 2 is clamped. Further, the core pieces 14A and 14B come into contact with the inner side surface of the housing portion 33a of the mounting portion 33, and the movement of the core pieces 14A and 14B in a separating direction is restricted by a predetermined amount, and the tip end of the core 14 is attached. Held in the portion 33.

  Subsequently, the drive shaft of the servo motor is driven to rotate, and winding of the belt-like body 2 is started. Specifically, the winding core 14 is rotated in the rotation direction indicated by the arrow Y in FIG. 3, and winding is started. In this state, since the outer edge shape of the cross section of the core 14 (core pieces 14A and 14B) is substantially circular as described above, the supply speed of the belt-like body 2 is substantially constant.

  When the winding is completed, air is discharged from the tube 28 of the chuck mechanism 23 to derive the chuck immersion state. Thereby, since the diameter of the core 14 in the arrangement direction of the core pieces 14A and 14B is D2 (D2 <D1) as described above, the belt-shaped body wound by sliding the core 14 in the longitudinal direction. 2 can be easily removed from the core 14.

  As described in detail above, according to the present embodiment, the positive electrode foil 5 and the one of the positive electrode foil 5 and the negative electrode foil 6 are protruded by the distance G from the end edge portion 5a of the positive electrode foil 5. The belt-like body 2 that is superposed in the order of the separator 4 (first separator), the negative electrode foil 6, and the other separator 3 (second separator) is sandwiched between the core pieces 14A and 14B and then wound.

  As a result, the plus electrode foil 5 and the minus electrode foil 6 are wound in an appropriate positional relationship, for example, since the plus electrode foil 5 is sandwiched between the core pieces 14A and 14B from the beginning, the variation in positional accuracy of the plus electrode foil 5 is eliminated. Can turn. Further, unlike the prior art, it is not a method of winding up only the separators 3 and 4 or the separators 3 and 4 and the negative electrode foil 6 at first, so that an extra separator as a charge is not required. As a result, a decrease in capacity performance and an increase in cost due to an extra separator can be suppressed.

  Moreover, in the present embodiment, the lengths of the arcs indicating the outer edges of the circumferential surfaces 24 and 25 are equal in the cross section of the core pieces 14A and 14B (that is, the gap H1 shown in FIG. Since it is formed so as to be divided into two equal parts), the insertion work of the belt-like body 2, that is, the transport and supply of the separators 3 and 4 is facilitated, and as a result, the productivity of the battery element 1 is improved.

  Further, according to the present embodiment, by supplying air to the tube 28 constituting the chuck mechanism 23, not only the belt-like body 2 is sandwiched, but also each core piece 14 </ b> A, 14 </ b> B moves in the separating direction and the mounting portion 33. The movement of the core pieces 14 </ b> A and 14 </ b> B in the separating direction is restricted, and the tip end of the core 14 is held by the mounting portion 33. Thereby, the strip | belt-shaped body 2 is wound in the state which maintained the diameter D1 of the core 14 in the sequence direction of core piece 14A, 14B. As a result, even if the thickness of the strip-shaped body 2 (according to the thickness of the material constituting the strip-shaped body 2) changes, the positive electrode foil 5 and the negative electrode foil 6 can be more reliably secured in an appropriate positional relationship. Can be wound. Further, in the state where the diameter D1 of the core 14 in the arrangement direction of the core pieces 14A and 14B is kept constant, the outer edge portion of the cross section of the core 14 is arranged on substantially the same circumference. The supply speed of the body 2 can be made substantially constant, and, for example, the time required for winding the belt-like body 2 can be shortened as compared with a case where the cross section of the core 14 is polygonal. As a result, the productivity of the battery element 1 can be improved.

  Furthermore, according to the present embodiment, when the winding is completed, air is discharged from the tube 28 of the chuck mechanism 23. Thereby, since the diameter of the core 14 in the arrangement direction of the core pieces 14A and 14B is D2 (D2 <D1), the wound belt-like body 2 is wound around the core by sliding the core 14 in the longitudinal direction. 14 can be easily removed.

  In addition, according to the present embodiment, when the edge 6 a of the minus electrode foil 6 is sandwiched in a state where the edge G 5 protrudes from the edge 5 a of the plus electrode foil 5 by the distance G, one separator 4 is conveyed. Then, the plus electrode foil 5 on the separator 4 is conveyed and supplied together with the separator 4, and the edge portion 5a of the plus electrode foil 5 is conveyed to a predetermined first position I1. Further, by transporting the other separator 3, the negative electrode foil 6 on the separator 3 is transported together with the separator 3, and the edge 6a of the negative electrode foil 6 is transported to a predetermined second position I2 (FIG. (See 5). Thereby, it becomes possible to arrange | position each electrode foil 5 and 6 in the appropriate position of 14A and 14B between core pieces, without being based on a very complicated structure.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows.

  (A) In the above embodiment, the lengths of the arcs indicating the outer edges of the circumferential surfaces 24 and 25 are equal in the cross section of the core pieces 14A and 14B (the gap H1 formed by the facing surfaces 26 and 27 is the core H 14, but the length of the arc indicating the outer edges of the circumferential surfaces 45 and 46 in the cross section of the core pieces 44A and 44B is the same as the core 44 shown in FIG. It may be different (the gap H2 is formed at a position shifted from the center). In this case, since one of the core pieces 44A is relatively large (thick), if a chuck mechanism is provided on the core piece 44A, a sufficient storage space 47 can be secured, and the chuck mechanism 48 can be relatively easy. Can be provided.

  (B) In the above embodiment, the chuck mechanism 23 is constituted by the tube 28, but a chuck mechanism having a mechanism different from that of the tube 28 may be adopted. For example, the chuck mechanism may be configured using an air cylinder and a chuck body that is moved relative to the core piece by the air cylinder.

  (C) In the above embodiment, the plus electrode foil 5 is placed on one separator 4, and the plus electrode foil 5 is also conveyed and supplied along with the conveyance and supply of the separator 4. Further, the negative electrode foil 6 is placed on the other separator 5, and the negative electrode foil 6 is also transported and supplied as the separator 5 is transported and supplied.

  However, as long as the plus electrode foil 5 and the minus electrode foil 6 can be arranged at appropriate positions between the core pieces 14A and 14B, the guide method of the electrode foils 5 and 6 is not particularly limited.

  For example, between the core pieces 14A and 14B may be set in the vertical direction (vertical direction), and the electrode foils 5 and 6 together with the two separators 3 and 4 may be suspended between the core pieces 14A and 14B. . In addition to the two separators 3 and 4, the electrode foils 5 and 6 may be conveyed and supplied to be inserted between the core pieces 14 </ b> A and 14 </ b> B.

  (D) In the above embodiment, the lithium ion battery is manufactured, but it can be embodied in a winding device used when manufacturing other nonaqueous electrolyte secondary batteries and the like. .

  (E) The cross-sectional shape of the core 14 does not necessarily have to be a substantially circular shape. For example, it may be a parallelogram shape or a substantially diamond shape.

  (F) In the above embodiment, the core 14 is constituted by the two core pieces 14A and 14B, but the core may be constituted by three or more core pieces.

It is a top view which shows the winding apparatus in embodiment. It is the partial side view which looked at the rotational drive means of the winding device from the side. It is an AA line end view of FIG. It is explanatory drawing which shows the movement of the core piece by a chuck mechanism. It is explanatory drawing which shows conveyance supply of the strip | belt-shaped object between core pieces. It is an end view of the core which shows the core structure of another embodiment. It is sectional drawing which shows typically the wound strip | belt shaped object.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery element, 2 ... Strip | belt body, 3, 4 ... Separator, 5 ... Positive electrode foil, 6 ... Negative electrode foil, 10 ... Winding device, 12 ... Rotation drive unit, 13 ... Support unit, 14, 44 ... Winding Core, 14A, 14B, 44A, 44B ... winding core piece, 15 ... rotating shaft, 16 ... mounting flange, 17 ... mounting arm, 18 ... spring, 19 ... bolt, 21 ... base end, 22 ... main body, 23, 48 ... Chuck mechanism, 24, 25, 45, 46 ... Circumferential surface, 26, 27 ... Opposing surface, 26a, 47 ... Housing recess, 28 ... Tube, 29 ... Adhesive portion, 29a ... Adhesive surface, 30 ... Clamping portion, 30a DESCRIPTION OF SYMBOLS ... clamping surface, 31 ... rotating shaft, 32 ... mounting flange, 33 ... mounting part, 33a ... accommodating part, 44 ... core, H1, H2 ... gap (slit), I1 ... 1st position, I2 ... 2nd position.

Claims (19)

Using a core having at least two core pieces extending from the base end portion, a belt-like body composed of a plus electrode foil, a minus electrode foil, and first and second separators is disposed between the core pieces. A battery element winding method for inserting and winding the battery element,
A battery element winding method, which is performed through the following steps (1) to (3).
(1) While inserting the strip | belt body which overlap | superposed in order of the said plus electrode foil, the said 1st separator, the said minus electrode foil, and the said 2nd separator between the said core pieces, the edge of the said plus electrode foil between the said core pieces The edge of the negative electrode foil is projected from the edge by a certain distance.
(2) By having a holding part for holding the belt-like body and having the holding part protrude between the core pieces by a chuck mechanism capable of protruding and retracting the holding part between the core pieces, Hold the band.
(3) The winding of the strip is started. In the winding method of the battery element according to claim 1,
In the procedure (1), the space between the core pieces is horizontal,
The positive electrode foil is placed on the first separator, and the positive electrode foil is also conveyed and supplied by conveying and supplying the first separator, and an edge portion of the positive electrode foil is interposed between the core pieces. The negative electrode foil is placed on the second separator, placed on the second separator, and transported and supplied by transporting and feeding the second separator. A battery element winding method, wherein an edge is disposed at a second position between the core pieces. In the winding method of the battery element according to claim 1 or 2,
In the step (2), by further causing the clamping mechanism to protrude by the chuck mechanism, the core pieces are moved in a separating direction that is separated from each other, and the diameter of the core in the separating direction is made constant. A method for winding a battery element. In the winding method of the battery element according to claim 3,
In the step (2), the battery element winding method is characterized in that the diameter of the core in the separation direction is kept constant by a regulating portion that regulates the movement of the core piece. In the winding method of the battery element according to claim 3 or 4,
After the step (3), when the winding of the band-like body is completed, the clamping mechanism is made to be immersed by the chuck mechanism, and the winding core is removed from the band-like body.   The winding device used for the winding method of the battery element in any one of Claims 1 thru | or 5. A core having at least two core pieces extending from the base end portion, the core being configured to be rotatably supported at least on the base end side, and a belt-like body between the core pieces. A battery element winding device that is inserted and wound,
At least one of the core pieces has a holding part for holding the belt-like body, and has a chuck mechanism capable of causing the holding part to protrude and retract between the core pieces. A battery element winding device. In the winding device of the battery element according to claim 7,
The battery element winding device is configured to move in a separating direction in which the core pieces are separated from each other when the clamping unit is protruded by the chuck mechanism. The winding device for a battery element according to claim 8,
A battery element winding device, comprising: a restricting portion that restricts movement of the winding core piece in the separation direction by a predetermined amount or more. In the winding device of the battery element according to claim 8 or 9,
A battery element winding device comprising biasing means for biasing the winding core pieces in a proximity direction close to each other. The battery element winding device according to any one of claims 6 to 10,
The battery element winding device according to claim 1, wherein an outer edge shape of a cross section of the core formed by each cross section of the core piece is substantially circular. The battery element winding device according to claim 11,
The winding core is composed of two winding core pieces, a first winding core piece and a second winding core piece, and arc lengths in cross sections of the first and second winding core pieces constituting the substantially circular outer edge are substantially equal. A battery element winding device characterized by comprising: The battery element winding device according to claim 11,
The winding core is composed of two winding core pieces, a first winding core piece and a second winding core piece, and the lengths of arcs in the cross sections of the first and second winding core pieces constituting the substantially circular outer edge are different. A battery element winding device. A core structure for winding a battery element, having at least two core pieces extending from a base end portion, for winding a band-shaped body by passing between the core pieces,
At least one of the core pieces has a holding part for holding the belt-like body, and has a chuck mechanism capable of causing the holding part to protrude and retract between the core pieces. A core structure for winding the battery element. In the core structure according to claim 14,
A core structure for winding a battery element, wherein the core piece is configured to move in a separating direction in which the core pieces are separated from each other when the clamping portion is projected by the chuck mechanism. In the core structure according to claim 14 or 15,
A core structure for winding a battery element, wherein an outer edge shape of a cross section constituted by each cross section of the core piece is substantially circular. The core structure according to claim 16,
The first and second core pieces have two core pieces, and the lengths of the arcs in the cross sections of the first and second core pieces constituting the substantially circular outer edge are substantially equal. A winding core structure for winding a battery element. The core structure according to claim 16,
It has two core pieces, the first core piece and the second core piece, and the arc lengths in the cross sections of the first and second core pieces constituting the substantially circular outer edge are different. A winding core structure for winding a battery element. The core structure according to any one of claims 14 to 18,
The clamping part is constituted by a tube,
The core structure for winding a battery element, wherein the chuck mechanism includes an air supply / discharge mechanism capable of supplying air into the tube and discharging air in the tube.

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