JP2015106434A - Method of manufacturing electrode for power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a utilization ratio of material used when manufacturing an electrode for a power storage device.SOLUTION: The method of manufacturing an electrode for a power storage device comprises: a step of preparing an electrode band 40 including long conductive foil 42, an active material layer 44 provided in the length direction of the conductive foil 42 on at least one surface of the conductive foil 42 and an active material layer non-forming area 42a provided in the length direction along at least one edge 42e of the conductive foil 42 on at least one surface of the conductive foil 42; a step of obtaining an electrode band piece 40t by cutting the length-direction end of the electrode band 40 along a direction orthogonal to the length direction; and a step of forming a tab portion 42ct by cutting a part of the active material layer non-forming area 42a of the electrode band piece 40t.

Description

  The present invention relates to a method for manufacturing an electrode for a power storage device.

  An electrode having a main body portion and a tab portion is used for a power storage device such as a lithium ion secondary battery. Conventionally, for this electrode, a sheet in which an active material layer is formed only on a part of the surface of the conductive foil is prepared, and the sheet is a part where the active material layer is not mainly formed by a method such as die cutting or punching. Has been produced by cutting out so that the portion where the active material layer is formed becomes the main body portion.

JP 2011-204612 A

  However, in the conventional method, when the electrodes are cut out from the sheet, a predetermined cutting margin portion is always required between the electrodes, and the cutting margin portion cannot be used as an electrode, and the sheet utilization rate is poor.

  This invention is made | formed in view of the said subject, and it aims at improving the utilization factor of the material at the time of the electrode for electrical storage apparatuses.

In the method for manufacturing an electrode for a power storage device according to the present invention, an active material layer is provided on at least one surface of a long conductive foil and in the length direction of the conductive foil, and on the at least one surface of the conductive foil An electrode band preparing step of obtaining an electrode band by forming an active material layer non-formation region in the length direction along at least one edge of the conductive foil;
A first step of cutting an electrode strip to obtain an electrode strip by cutting an end portion in the length direction of the electrode strip along a direction orthogonal to the length direction;
A tab portion forming step of cutting a part of the active material layer non-formation region of the electrode strip to form a tab portion.

  According to the present invention, as compared with the conventional case of punching and punching the electrode shape from the electrode strip, the cutting margin between the electrodes in the length direction of the electrode strip is not required, which is wasted when manufacturing the electrode. Less material.

  Here, the active material layer non-formation region of the electrode strip is provided in the length direction along both edges of the conductive foil on the at least one surface of the conductive foil, and the method includes: Furthermore, it is preferable to include a step of cutting the electrode strip along the length direction. According to this, two electrodes can be obtained at a time.

In another method for manufacturing an electrode for a power storage device according to the present invention, a plurality of active material layers are formed on at least one surface of a long conductive foil, and the active material layer is formed on the at least one surface of the conductive foil. An electrode band preparing step for obtaining an electrode band by forming an active material layer non-formation region along the width direction of the conductive foil between the material layers,
An electrode having at least a part of the active material layer non-formation region and at least a part of the active material layer by cutting an end portion in the length direction of the electrode strip along a direction orthogonal to the length direction An electrode band cutting first step for obtaining a strip;
A tab portion forming step of cutting a part of the active material layer non-formation region of the electrode strip to form a tab portion.

  According to the present invention, as compared with the conventional case where the electrode shape is punched from the electrode strip, the cutting margin in the width direction of the electrode strip is not required, and therefore, the portion that is wasted when manufacturing the electrode is reduced. Can do.

  Here, it is possible to prepare two or more electrode strips by cutting a wide electrode strip having a width twice or more the width of the electrode strip along the length direction. Thereby, a lot of electrodes can be manufactured efficiently.

  Here, in each of the above-described inventions, in the step of forming the tab portion, the electrode strip can be pressed in a thickness direction with a pair of plates. Thereby, it is possible to reduce the curvature of an electrode strip, and the shape and / or dimensional accuracy of the cut | disconnected electrode improve.

  Further, at least one of the pair of plates has a suction tube opened on a surface in contact with the electrode strip, and in the step of forming the tab portion, the suction tube is evacuated to reduce the electrode. A strip may be pressed against the at least one plate. This can also reduce the warpage of the electrode strip and improve the shape and / or dimensional accuracy of the cut electrode.

  In addition, at least one of the pair of plates may have a recessed portion that is recessed in a portion in contact with the active material layer than in a portion in contact with the active material layer non-formation region. This also improves the shape and / or dimensional accuracy of the cut electrode.

  ADVANTAGE OF THE INVENTION According to this invention, the utilization factor of the material at the time of manufacture of the electrode for electrical storage apparatuses can be improved.

1A is a plan view of an electrode strip according to the first embodiment, FIG. 1B is a cross-sectional view of FIG. 1A, and FIG. 1C is a plan view illustrating a process of cutting the electrode strip. It is. 2A is a plan view of the electrode strip 40t of the first embodiment, and FIG. 2B is a plan view of the electrode 20 obtained by cutting the electrode strip 40t. FIGS. 3A, 3B, and 3C are schematic cross-sectional views sequentially showing the electrode strip cutting process of the first embodiment. 4A is a plan view of the wide electrode strip of the second embodiment, FIG. 4B is a sectional view of FIG. 4A, and FIG. 4C is a cross-sectional view of the wide electrode strip 50 of FIG. FIG. 4D is a plan view of the electrode strip 51t, and FIG. 4E is a plan view of the electrode 20 obtained by cutting the electrode strip 51t. FIG. 5 is a schematic sectional view showing an electrode strip cutting step in the second embodiment.

  An example of a method for manufacturing an electrode for a power storage device according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
First, an electrode strip 40 as shown in FIGS. 1A and 1B is prepared. The electrode strip 40 includes a conductive foil 42 and an active material layer 44. The conductive foil 42 is a long foil having conductivity. Although there is no restriction | limiting in the material of conductive foil if it has electroconductivity, The example of the conductive material in the case of a positive electrode is metal materials, such as stainless steel, titanium, nickel, aluminum, or conductive resin. An example of the conductive material in the case of the negative electrode is copper.

  Although the thickness of the conductive foil 42 is not specifically limited, For example, it can be set as 5-30 micrometers.

  The width B of the conductive foil 42 may be equal to or larger than (distance L1 + distance L2 + distance L3) × 2 + distance L0 in FIG. Moreover, the full length of the length direction of the electrically conductive foil 42 is not specifically limited, For example, it can be 300 m or more.

  The active material layers 44 are provided on both surfaces of the conductive foil 42 and extend in the length direction of the conductive foil 42. In the present embodiment, the width A of the active material layer 44 is smaller than the width B of the conductive foil 42, and both edges 42 e (edges extending in the length direction) of the conductive foil 42 on both sides of the conductive foil 42. The active material layer non-formation area | region 42a in which the active material layer 44 is not formed is formed along. The width A of the active material layer 44 may be a distance L1 + a distance L1 + a distance L0 in FIG. In addition, the width A ′ of the active material layer non-formation region 42 a may be the same as or larger than L2 + L3 in FIG.

  The thickness of the active material layer 44 is not particularly limited, but may be, for example, 5 to 200 μm.

In the case of the positive electrode, the active material layer 44 includes a positive electrode active material and a binder. An example of the positive electrode active material is a lithium-containing transition metal oxide. An example of the lithium-containing transition metal oxide is a composite oxide containing Li and at least one element selected from the group consisting of Ni, Mn, and Co. Examples of the composite oxide include lithium cobalt composite oxide LiCoO ₂ , lithium nickel composite oxide LiNiO ₂ , lithium manganese composite oxide LiMnO ₂ , LiMn ₂ O ₄ , lithium nickel cobalt composite oxide LiNi _a Co _b O ₂ ( a + b = 1,0 <a < 1,0 <b <1), lithium-manganese-cobalt composite oxide _{LiMn a Co b O 2 (a} + b = 1,0 <a <1,0 <b <1), lithium cobalt nickel manganese composite oxide _{LiCo p Ni q Mn r O 2} (p + q + r = 1,0 <p <1,0 <q <1,0 <r <1). Examples of the composite oxide include LiCo _1/3 Ni _1/3 Mn _1/3 O ₂ , LiNi _0.6 Co _0.2 Mn _0.2 O ₂ , LiNi _0.5 CO _0.2 Mn _0.3 O ₂ , LiCoO ₂ , LiNi _0.8 Co _0.2 O ₂ , LiCoMnO ₂ .

The positive electrode active material has a general formula: LiCo _p Ni _q Mn _r D _S O ₂ (p + q + r + s = 1, 0 <p ≦ 1, 0 ≦ q <1, 0 ≦ r <1, 0 <s <1) It can also be a lithium-containing transition metal oxide represented. D is at least one element selected from the group consisting of Al, Mg, Ti, Sn, Zn, W, Zr, Mo, Fe, and Na.

The positive electrode active material is Li ₂ MnO ₃ , LiFePO ₄ , LiMnPO ₄ , Li ₂ FeP ₂ O ₇ , Li ₂ FeSiO ₄ , Li ₂ MnSiO ₄ , LiNi _0.5 Mn _1.5 O ₄ , and the above-described oxidation It can be an oxide solid solution containing any of the above.

  The binder is a resin blended to fix the active material to the conductive foil. Examples of the binder are fluorine-containing resins such as polyvinylidene fluoride, polytetrafluoroethylene, and fluororubber, thermoplastic resins such as polypropylene and polyethylene, imide resins such as polyimide and polyamideimide, and alkoxysilyl group-containing resins. The quantity of a binder can be 1-30 mass parts with respect to 100 mass parts of active materials.

  The active material layer 44 can further contain a conductive additive as necessary. Examples of the conductive aid are carbon-based particles such as carbon black, graphite, acetylene black (AB), ketjen black (registered trademark) (KB), vapor grown carbon fiber (VGCF). These can be added alone or in combination of two or more. Although it does not specifically limit about the usage-amount of a conductive support agent, For example, it can be set as 1-30 mass parts with respect to 100 mass parts active material.

  The active material layer 44 in the case of the negative electrode has a negative electrode active material instead of the positive electrode active material. Also in the case of the negative electrode, the active material layer 44 may include a conductive additive as necessary. Examples of the binder and the conductive auxiliary agent can be the same as in the case of the positive electrode. The quantity of a binder can be 1-30 mass parts with respect to 100 mass parts negative electrode active material, for example. The quantity of a conductive support agent can be 1-30 mass parts with respect to 100 mass parts negative electrode active material.

Examples of the negative electrode active material include graphite, non-graphitizable carbon (hard carbon), graphitizable carbon (soft carbon), Sn, Sn alloy, Si, Si alloy, SiO _x (0 <x <2), Ge Ge alloys, carbon nanotubes, and carbon nanofibers. Any combination of these negative electrode active materials can also be used.

  Subsequently, the distal end portion in the length direction of the electrode strip 40 is cut along a C1-C1 imaginary line extending in a direction (width direction) orthogonal to the length direction, as shown in FIG. A rectangular electrode strip 40t having a lengthwise distance W is obtained. Although a cutting device is not specifically limited, For example, a shear can be utilized.

  Subsequently, the electrode strip 40t is cut along imaginary lines C2-C2, C3-C3, C4-C4, and C5-C5 shown in FIG. 2A, and 2 shown in FIG. Two electrodes 20 are obtained. The virtual line C2-C2 and the virtual line C5-C5 are on the active material layer non-formation region 42a on one side and the other side, respectively, and define the shape of the tab part 42ct and the shape of the side 42cce on the side having the tab part 42ct. To do. The virtual lines C3-C3 and C4-C4 are respectively on the active material layer 44, and define the shape of the side of the electrode 20 opposite to the side having the tab portion 42ct.

  The obtained electrode 20 includes a conductive foil 42c and an active material layer 44c provided on both surfaces of the conductive foil 42c. The conductive foil 42c has a rectangular main body portion 42cc having a size of W × (L1 + L2), and a tab portion 42ct that protrudes from one side of the main body portion 42cc with a distance L3 and a width TW.

  The active material layer 44c is formed over the respective edges of the three sides where the tab portion 42ct of the main body portion 42cc is not formed. Further, the active material layer 44c is formed only up to the side 42cce provided with the tab portion 42ct in the main body portion 42cc and the extended line thereof to the distance L2.

  Returning to (a) of FIG. 2, the positions and shapes of the imaginary line C2-C2, the imaginary line C3-C3, the imaginary line C4-C4, and the imaginary line C5-C5 when cutting the electrode strip 40t are as follows. It can set suitably according to the electrode 20 to manufacture.

  For example, the distance L2 from the side 42cce to the active material layer 44c can be 5 to 100 mm. The distance L3 from which the tab portion 42ct protrudes can be set to 5 to 100 mm, for example. Moreover, the width TW of the tab part 42ct can be 5-100 mm, for example. Moreover, the distance W which is the width | variety of the electrode 20 can be 100-200 mm. Furthermore, the distance L1 (in the direction orthogonal to the distance W) of the active material layer 44 can be set to 5 to 200 mm. The distance L0 between the virtual line C3-C3 and the virtual line C4-C4 can be set to, for example, 0 to 100 mm. L0 may be zero.

  When manufacturing the electrode 20 by cutting the electrode strip 40t, the electrode strip 40t can be cut using the cutting device 200 shown in FIG.

  The cutting device 200 mainly includes a pedestal 100, a pressing plate 120, and a blade unit 130.

  As shown in FIG. 3A, the base 100 has an upper surface 100u on which the electrode strip 40t is placed. A recess 100ud is formed at the center of the upper surface 100u. The size and depth of the recess 100ud are the same as those of the active material layer 44c of the electrode strip 40t shown in FIG.

  The pedestal 100 has a plurality of suction pipes 100p that open to portions of the upper surface 100u that are in contact with the electrode strips 40t, for example, the active material layer non-forming region 42a and the active material layer 44c. The end is connected to an external pump (not shown) via the collecting pipe 100q.

  The holding plate 120 is disposed above the upper surface 100u of the base 100 and has a lower surface 120u facing the upper surface 100u. The holding plate 120 can be moved back and forth with respect to the upper surface 100u of the pedestal 100 by a moving mechanism (not shown), and further, pressure is applied to the electrode strip 40t placed on the upper surface 100u to apply to the upper surface 100u. It can be pressed against.

  A recess 120ud is formed at the center of the lower surface 120u of the pressing plate 120. The size and depth of the recess 100ud are the same as the active material layer 44c of the electrode strip 40t shown in FIG. 2, and the position of the recess 120ud is set at a position facing the recess 100ud on the upper surface 100u of the base 100. Has been.

  The blade unit 130 includes virtual lines C2-C2, virtual lines C3-C3, virtual lines C4-C4, and blades 132, 133, 134 respectively corresponding to the virtual lines C5-C5 shown in FIG. 135 are fixed to the blade base 138. The presser plate 120 is formed with a through hole 120th through which the blades 132 to 135 can pass in the vertical direction. The blade pedestal 136 can be moved back and forth with respect to the upper surface 100u of the pedestal 100 independently of the presser plate 120 by a moving mechanism (not shown), and can be moved relative to the electrode strip 40t placed on the upper surface 100u. The electrode strip 40t can be cut by pressing the blade.

  Next, a method for cutting the electrode strip 40t will be described. First, as illustrated in FIG. 3B, the electrode strip 40 t is placed on the upper surface 100 u of the pedestal 100. At this time, the active material layer 44c of the electrode strip 40t is placed so as to enter the recess 100ud.

  Subsequently, the pressing plate 120 is lowered, and the electrode strip 40 t is pressed against the upper surface 100 u of the base 100 by the lower surface 120 d of the pressing plate 120. At this time, the active material layer 44 c enters the recess 120 ud of the pressing plate 120. Further, the gas in the suction tube 100p is exhausted, and the electrode strip 40t is pressed against the pedestal 100 even by atmospheric pressure.

  Subsequently, while continuing the pressing by the holding plate 120 and the decompression by the suction pipe 100p, the blade unit 130 is lowered downward, and the virtual line C2-C2, the virtual line C3-C3, the virtual line C4-C4, and Then, along the imaginary line C5-C5, both ends of the electrode strip 40t different from the previous cutting are cut, and the above-described electrode 20 is obtained.

  According to the present embodiment, the long electrode strip 40 having the active material layer non-formation region 42a in the length direction is cut in the width direction to form the rectangular electrode strip pieces 40t, and then the active material layer non-layer is formed. The formation region 42a is cut to form a tab portion 42ct. Therefore, the distance W in the electrode 20 is defined by the distance W in the first cutting process. Therefore, as compared with the conventional case where the tabbed electrode is formed from the electrode strip 40 by die cutting or punching, the cutting margin in the length direction is not required, and the utilization efficiency of the electrode strip 40 is increased.

  In this embodiment, since the active material layer non-formation region 42a is formed along both edges 42e of the electrode strip 40, the width A of the active material layer 44 of the electrode strip 40 is set to the active material layer of the electrode 20. By making the distance L1 twice or more, the two electrodes can be formed by one operation, and the efficiency is improved.

  Further, in the present embodiment, the electrode strip 40t is pressed in the thickness direction by the pressing plate 120 and the pedestal 100, and the electrode strip 40t is strongly pressed against the pedestal 100 by sucking the gas by the suction tube 100p. The accuracy of the shape and / or size of the formed electrode 20 is improved. In particular, the electrode strip 40t is warped due to the fact that the electrode strip 40 is often stored in a roll state and / or stress is applied when the electrode strip 40 is cut along the virtual line C1-C1. It often ends up. If the cutting is performed while warping, the position of the imaginary line of the electrode strip 40t is shifted, and the accuracy of the shape and / or dimensions of the obtained electrode, in particular, the distance L2 is likely to fluctuate. And / or dimensioned electrodes are obtained.

  Furthermore, in this embodiment, since the base 100 and the pressing plate 120 have the recesses 100ud and 120ud, respectively, the electrode strip 40t can be easily positioned, and the electrode strip 40t is matched to the shape thereof. Since the pressing can be performed, the warp can be reduced more effectively, and the accuracy of the shape and / or dimensions of the electrode can be further improved.

(Second Embodiment)
Subsequently, a method according to the second embodiment will be described. First, a wide electrode strip 50 as shown in FIG. The wide electrode strip 50 includes a conductive foil 42 and a plurality of active material layers 44. The materials of the conductive foil 42 and the active material layer 44 and the shape of the conductive foil 42 are the same as those in the first embodiment, but in this embodiment, the form of the active material layer 44 is different from that in the first embodiment.

  Each of the active material layers 44 of the present embodiment is formed from one end to the other end in the width direction of the long conductive foil 42. In addition, a large number of active material layers 44 are arranged in the length direction, and a rectangular active material layer non-formation region 42 a in which no active material layer 44 is formed is formed between the active material layers 44. The width 2W of the wide electrode strip 50 is twice the distance W, which is the width of the electrode 20 shown in FIG. The distance L4 in the length direction of the conductive foil 42 of the active material layer 44 can be made longer than the distance L1 (the distance in the length direction of the wide electrode strip) of the active material layer 44c of the electrode 20 described later. Furthermore, the distance E in the length direction of the active material layer non-formation region 42a can be appropriately set according to the distance L3, the distance L2, and the distance L5 in FIG. 4E, that is, according to L2 + L3-L5. In addition, the active material layer 44 is provided on both sides of the conductive foil 42 at positions facing each other.

  Subsequently, the wide electrode band 50 is cut along the length direction along the virtual line D1-D1 in FIG. 4A to obtain two electrode bands 51 having a width W. Also in the electrode strip 51, the active material layer 44 is formed from one end to the other end in the width direction. Further, an active material layer non-formation region 42 a extending in the width direction is formed between the active material layers 44.

  Subsequently, as shown in FIG. 4C, the end in the length direction of the electrode strip 51 having a width W extends in a direction orthogonal to the length direction of the electrode strip 51 (width direction of the electrode strip 51). By sequentially cutting along the virtual line D2-D2, a plurality of rectangular electrode strips 51t as shown in FIG. 4D are obtained. At this time, as illustrated in FIG. 4C, the virtual line D <b> 2-D <b> 2 is disposed not on the active material layer non-formation region 42 a but on the end portion of the active material layer 44. The distance L5 between the tip of the active material layer 44 and the virtual line D2-D2 can be set to 2 to 200 μm. Therefore, the electrode strip 51t includes a part of one active material layer 44, the active material layer 44 'having a distance L6 in the length direction, one active material layer non-formation region 42a, and one active material. It includes an active material layer 44 ″ with a distance L5 in the length direction, which is a part of the layer 44. The distance L6 (in the length direction) of the active material layer 44c of the obtained electrode strip 51t is smaller than the distance L4 in the length direction of the active material layer 44 of the electrode strip 51 by a distance L5. In the electrode strip 51t, the active material layer non-formation region 42a is disposed so as to be biased toward one side in the rectangular length direction.

  Subsequently, the electrode strip 51t is cut along the virtual lines D3-D3 and D4-D4 to obtain the electrode 20 shown in FIG. The imaginary lines D4-D4 are arranged on the end of the active material layer 44 ′ opposite to the active material layer non-formation region 42a, and a part of the electrode strip 51t is cut off, thereby The distance L1 in the length direction of the material layer 44c is set to a predetermined value. A distance L7 between the virtual line D4-D4 and the end of the electrode strip 51t can be set to 1 to 200 mm, for example. The imaginary line D3-D3 is arranged so as to extend from the active material layer non-formation region 42a to the active material layer 44 '', defines the width TW of the tab portion 42ct, and the main body portion 42cc of the conductive foil 42c. The side 42cce on the tab portion 42ct side and the distance L2 between the side 42cce and the active material layer 44c are defined.

  Each distance L1, distance L2, distance L3, width TW, and width W of the electrodes can be the same as in the first embodiment.

  As a method of cutting the electrode strip 51t with the virtual lines D4-D4 and D3-D3, the same cutting device 200 as that of the first embodiment can be used. Specifically, as shown in FIG. 5, the pedestal 100 and the holding plate 120 have a recess 100 ud and a recess 120 ud corresponding to the active material layer 44 c and the active material layer 44 ″. It has a suction tube 100p and can press and suck the electrode strip 51t. The blade unit 130 includes a blade 137 corresponding to the virtual line D3-D3, a blade 137 corresponding to the virtual line D4-D4, and a blade base 138 for fixing them.

  According to the present embodiment, the long electrode strip 51 having the plurality of active material layers 44 formed in the width direction and the plurality of active material layer non-formation regions 42a disposed therebetween is widened. A rectangular electrode strip 51t having a part of the active material layer 44 and the entire active material layer non-formation region 42a is formed by cutting in the direction, and then the active material layer non-formation region 42a is cut to form a tab. A portion 42ct is formed. Accordingly, the width W of the electrode 20 is defined by the width W of the electrode band 51. For this reason, as compared with the conventional case where the tabbed electrode is punched or punched from the electrode strip, the cutting margin in the width direction is not required, and the utilization efficiency of the electrode strip 40 is increased.

  Furthermore, in the present embodiment, the electrode strip 51t is pressed by the pressing plate 120 and gas is sucked by the suction tube 100p to strongly press the electrode strip 51t against the pedestal 100, so that the shape of the cut electrode and / or Dimensional accuracy is improved. In particular, the electrode band 51 and / or the wide electrode band 50 are often stored in a roll state, and / or when the wide electrode band 50 is cut along the imaginary line D1-D1, or the electrode band 51 is imaginary line. The electrode strip 51t often warps due to stress applied when cutting at D2-D2. When cutting while warping, the position of the imaginary line of the electrode strip 51t is shifted, and the accuracy of the shape and / or dimensions of the obtained electrode, in particular, the distance L2 and the distance L1 are likely to fluctuate. An electrode with a precise shape and / or dimensions is obtained.

  Furthermore, in this embodiment, since the base 100 and the pressing plate 120 have the recesses 100ud and 120ud, respectively, the electrode strip 51t can be easily positioned, and the electrode strip 51t is matched to the shape thereof. Since it can be pressed, the warp of the electrode strip 51t is further effectively reduced, and the accuracy of the shape and / or dimensions of the electrode is further improved.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, the electrode strip in which the active material layer is formed on both surfaces of the conductive foil is adopted, but the electrode strip in which the active material layer is formed only on one surface of the conductive foil is adopted. In that case, an electrode having an active material layer only on one side is obtained.

  Moreover, although the pressing plate 120 and the base 100 are employ | adopted as a pair of plate which presses an electrode strip in the thickness direction, the form of the pressing plate 120 and the base 100 is not specifically limited. Moreover, when there is little curvature of an electrode strip, it can implement even if it does not employ | adopt press operation.

  In the above embodiment, the suction tube 100p is formed only on the pedestal 100. However, the suction tube 100p may be provided only on the pressing plate 120, or the suction tube 100p may be both the pedestal 100 and the pressing plate 120. May be provided. Further, the present invention can be implemented even when the suction pipe 100p is not provided on either the pedestal 100 or the pressing plate 120.

  Moreover, in the said embodiment, although the recessed parts 100ud and 120ud are formed in both the holding | suppressing board 120 and the base 100, even if a recessed part is formed only in any one, it can implement, and an active material layer Depending on the thickness of the plate, it is possible to implement even if no depression is formed in either the pressing plate 120 or the pedestal 100.

  In the second embodiment, the width of the wide electrode band 50 is 2 W, but it may be an integer multiple other than 2 such as 3 W or 4 W. In this case, a large number of electrode bands can be manufactured. Further, the present invention can be implemented even if the width of the wide electrode strip 50 is not an integral multiple of W. In the second embodiment, the wide electrode strip 50 is cut to form the electrode strip 51. However, the present invention is not limited thereto, and a conductive foil 42 having a width W is prepared, and a plurality of active material layers 44 are formed thereon. The electrode band 51 may be formed by forming.

  In the second embodiment, the virtual line D2-D2 is on the active material layer 44, but may be on the boundary between the active material layer 44 and the active material layer non-formation region 42a. It may be on the non-formation region 42a. However, if the virtual line D2-D2 is on the active material layer 44, there is an effect that it is possible to prevent the blade and the conductive foil from being welded during pressing. When the imaginary line D2-D2 is on the boundary between the active material layer 44 and the active material layer non-formation region 42a, the electrode strip 51t has the entire active material layer 44 and the entire active material layer non-formation region 42a. Have Further, when the virtual line D2-D2 is on the active material layer non-formation region 42a, the electrode strip 51t includes a part of the active material layer non-formation region 42a, the entire active material layer 44, and no active material layer formation. Part of the region 42a is included.

  The electrode 20 obtained as in the present embodiment can be suitably used as an electrode for a power storage device such as a lithium ion secondary battery or an electric double layer capacitor.

  DESCRIPTION OF SYMBOLS 20 ... Electrode, 40, 51 ... Electrode belt, 40t, 51t ... Electrode strip, 42 ... Conductive foil, 42a ... Active material layer non-formation area, 42ct ... Tab part, 42e ... Edge, 44 ... Active material layer, 50 ... Wide electrode strip, 100: pedestal (plate), 100 ud, 120 ud: recessed portion, 120: pressing plate (plate).

Claims (7)

While forming an active material layer on at least one surface of the long conductive foil and in the length direction of the conductive foil,
An electrode band preparation step for obtaining an electrode band by forming an active material layer non-formation region in the length direction along at least one edge of the conductive foil on the at least one surface of the conductive foil;
A first step of cutting an electrode strip to obtain an electrode strip by cutting an end portion in the length direction of the electrode strip along a direction orthogonal to the length direction;
A tab part forming step of cutting a part of the active material layer non-formation region of the electrode strip to form a tab part. The active material layer non-formation region of the electrode strip is formed in the length direction along both edges of the conductive foil on the at least one surface of the conductive foil,
The method according to claim 1, further comprising an electrode strip cutting second step of cutting the electrode strip along the length direction. A plurality of active material layers are formed on at least one surface of the long conductive foil, and the active material layer is not disposed along the width direction of the conductive foil between the active material layers on the at least one surface of the conductive foil. An electrode band preparation step of forming a formation region to obtain an electrode band; and
An electrode having at least a part of the active material layer non-formation region and at least a part of the active material layer by cutting an end portion in the length direction of the electrode strip along a direction orthogonal to the length direction An electrode band cutting first step for obtaining a strip;
A tab part forming step of cutting a part of the active material layer non-formation region of the electrode strip to form a tab part.   The method according to claim 3, wherein a wide electrode band having a width equal to or greater than twice the width of the electrode band is cut along a length direction thereof to obtain two or more electrode bands.   The method according to any one of claims 1 to 4, wherein in the step of forming the tab portion, the electrode strip is pressed with a pair of plates in a thickness direction.   At least one of the pair of plates has a suction tube opened on a surface in contact with the electrode strip, and in the step of forming the tab portion, the suction strip is evacuated to reduce the electrode strip. The method according to claim 5, wherein the pressure is pressed against the at least one plate.   The at least one board of said pair of board has a hollow part which is depressed rather than the part which contacts the said active material layer non-formation area | region in the part which contacts the said active material layer. the method of.

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