JP2020102353A - Laminated electrode manufacturing device, and laminate manufacturing device - Google Patents

Abstract

To provide a laminated electrode manufacturing device capable of suppressing positional displacement of electrodes and mutual short-circuiting between the electrodes, and a laminate manufacturing device.SOLUTION: A laminated electrode manufacturing device 20 comprises: a heater roller 26 covering a cathode 8 by forming a cathode accommodation separator member 118 by welding separator members 18a and 18b; and a supply reel 46 for supplying an anode member 41 which is a base material of an anode 9, to the cathode accommodation separator member 118. A cutting part 31 cuts the cathode accommodation separator member 118 and the anode member 41 which is bonded to the cathode accommodation separator member 118. The cutting part 31 cuts the cathode accommodation separator member 118 and the anode member 41 at positions of welding regions W6 and W7 where the cathode accommodation separator member 118 is welded. The cathode 8 is being encapsulated in welding regions W1, W2 and W3 while being covered by a separator 10, thereby suppressing contact of burrs with the cathode 8.SELECTED DRAWING: Figure 5

Description

The present invention relates to a laminated electrode manufacturing apparatus and a laminated body manufacturing apparatus.

Patent Document 1 discloses a laminated electrode manufacturing apparatus in which a separator base material and individual pieces of a positive electrode and a negative electrode are stacked, and then each sheet is joined and the separator base material is cut. .. In Reference 2, as a laminated electrode manufacturing apparatus, a long positive electrode base material and a separator layer (base material) are stacked and then cut into individual pieces. After that, the negative electrode base material is overlaid on the positive electrode with the separator and then cut into individual pieces.

JP, 2017-216219, A JP, 2017-054587, A

In the laminated electrode manufacturing apparatus described in Patent Document 1 described above, the individual positive electrodes and negative electrodes are conveyed without being fixed between the stacking of the sheets and the joining. Therefore, the positive electrode or the negative electrode may be displaced. Such a problem becomes remarkable when the speed of the line is increased. Further, in the laminated electrode manufacturing apparatus described in Patent Document 2, since the positive electrode and the separator are cut at the same time, burrs generated from the metal foil of the positive electrode may extend to the opposite side of the separator, causing a short circuit (short circuit). There is a risk.

It is an object of the present invention to provide a laminated electrode manufacturing apparatus and a laminated body manufacturing apparatus capable of suppressing displacement of electrodes and short circuit between electrodes.

A laminated electrode manufacturing apparatus according to one aspect of the present invention laminates a second electrode with a separator-attached electrode in which a first electrode is covered with a separator while being packaged while conveying the first electrode along a conveyance path. A laminated electrode manufacturing apparatus for manufacturing a laminated electrode, comprising: a welding portion that covers the first electrode by welding a separator member that is a base material of the separator to form an electrode housing separator member; and an electrode housing separator member. On the other hand, a supply unit that supplies the electrode member that is the base material of the second electrode, an electrode housing separator member that is provided on the downstream side of the welding unit and the supplying unit, and an electrode member that is joined to the electrode housing separator member. A cutting part for cutting, and the cutting part cuts the electrode containing separator member and the electrode member at the position of the welding region of the electrode containing separator member.

The laminated electrode manufacturing apparatus includes a welding portion that covers the first electrode by welding a separator member that is a base material of the separator to form an electrode housing separator member, and a second electrode of the electrode housing separator member. And a supply unit that supplies an electrode member that is a base material. In addition, the cutting unit cuts the electrode housing separator member and the electrode member joined to the electrode housing separator member. As described above, when the electrode member is supplied to the electrode housing separator member, the first electrode is housed in the electrode housing separator member, so that the position is fixed. In addition, the electrode member is joined to the electrode-accommodating separator member at a stage before being cut into individual pieces of the second electrode. Therefore, as compared with the case where the first electrode and the second electrode are superposed in a state of individual pieces and then joined together, a positional deviation may occur between the first electrode and the second electrode. Can be suppressed. Further, the cutting portion cuts the electrode containing separator member and the electrode member at the position of the welding region of the electrode containing separator member. In this case, even if burrs are generated on the individual pieces of the second electrode, the burrs are first formed because the first electrodes are covered with the separator and sealed in the welding region. The contact with the electrode is suppressed. As described above, it is possible to suppress the displacement of the electrodes and the short circuit between the electrodes.

The electrode member may be joined to the electrode-accommodating separator member via an adhesive layer. In this case, the electrode member can be easily joined to the electrode housing separator member.

The welded region of the separator and the joining portion of the second electrode with respect to the separator may be arranged so as to be offset from each other when viewed in the stacking direction. In this way, by setting the welding region of the separator and the joint portion of the second electrode at different positions, it is possible to suppress deformation such as bending.

When being cut by the cutting portion, the electrode member is arranged on the side of the electrode accommodating separator member opposite to the blade portion of the cutting portion. In this case, even when burrs are generated when the blade is inserted when the second electrode is cut, the burrs extend in the direction opposite to the electrode accommodating separator member in the entrance direction of the blade. Burr due to cutting of the electrode can occur both when the blade is inserted and when the blade is pulled out, but care must be taken when inserting the blade in the direction in which the burr extends. is there. The burr extends along with the movement of the blade portion, but at the same time, when the blade portion enters, it is obstructed by the blade portion and the thickness of the blade portion gradually increases. Therefore, in the horizontal direction, the side opposite to the blade portion, That is, it easily extends to the first electrode side. With the above configuration, since there is no separator member that covers the first electrode in the entrance direction of the blade when the blade is inserted, the risk of short circuit can be suppressed regardless of the horizontal position of the burr.

A laminated body manufacturing apparatus according to the present invention includes the laminated electrode manufacturing apparatus described above, and a laminating unit that laminates a plurality of laminated electrodes to form a laminated body.

According to the laminated body manufacturing apparatus, by using the laminated electrode manufacturing apparatus described above, it is possible to manufacture the laminated body in which the positional displacement of the electrodes and the short circuit between the electrodes are suppressed.

According to the present invention, there is provided a laminated electrode manufacturing apparatus capable of suppressing displacement of electrodes and short circuit between electrodes.

It is sectional drawing which shows the inside of the electrical storage apparatus manufactured by applying the electrode manufacturing apparatus to which the laminated electrode manufacturing apparatus which concerns on this embodiment is applied. It is the II-II sectional view taken on the line of FIG. It is a figure which shows typically the positive electrode with a separator. FIG. 4A is a schematic plan view of the laminated body manufacturing apparatus according to the present embodiment, and FIG. 4B is a schematic side view of the laminated portion. It is a schematic side view of the laminated electrode manufacturing apparatus which concerns on this embodiment. It is a figure which shows the mode of the welding area|region when a separator member is removed. It is a top view which shows a negative electrode member. It is a schematic sectional drawing of a laminated electrode. It is a figure for demonstrating the subject of the laminated electrode manufacturing apparatus which concerns on a modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements will be denoted by the same reference symbols, without redundant description.

FIG. 1 is a cross-sectional view showing the inside of a laminated electrode manufacturing apparatus according to an embodiment of the present invention and a power storage device using electrodes manufactured by applying the laminated body manufacturing apparatus. FIG. 2 is a sectional view taken along line II-II of FIG. 1 and 2, the power storage device 1 is a lithium-ion secondary battery having a laminated electrode assembly.

The power storage device 1 includes a case 2 having a substantially rectangular parallelepiped shape, for example, and an electrode assembly 3 housed in the case 2. The case 2 is made of metal such as aluminum. Although not shown, for example, a non-aqueous (organic solvent) electrolytic solution is injected into the case 2. On the case 2, the positive electrode terminal 4 and the negative electrode terminal 5 are arranged apart from each other. The positive electrode terminal 4 is fixed to the case 2 via an insulating ring 6, and the negative electrode terminal 5 is fixed to the case 2 via an insulating ring 7. Further, an insulating film is arranged between the electrode assembly 3 and the inner side surface and bottom surface of the case 2, and the case 2 and the electrode assembly 3 are insulated by the insulating film. In FIG. 1, for the sake of convenience, a slight gap is provided between the lower end of the electrode assembly 3 and the bottom surface of the case 2, but in reality, the lower end of the electrode assembly 3 is inside the case 2 via an insulating film. Touches the bottom of the.

The electrode assembly 3 has a structure in which a plurality of positive electrodes 8 (first electrodes) and a plurality of negative electrodes 9 (second electrodes) are alternately stacked with a bag-shaped separator 10 interposed therebetween. The positive electrode 8 is wrapped in a bag-shaped separator 10. The positive electrode 8 wrapped in the bag-shaped separator 10 is configured as a positive electrode 11 with a separator. Therefore, the electrode assembly 3 has a structure in which a plurality of positive electrodes 11 with separators and a plurality of negative electrodes 9 are alternately stacked. The electrodes located at both ends of the electrode assembly 3 are the negative electrodes 9.

FIG. 3 is a diagram schematically showing the positive electrode 11 with a separator. As shown in FIGS. 1 to 3, the positive electrode 8 has a metal foil 14 which is a positive electrode current collector made of, for example, an aluminum foil, and a positive electrode active material layer 15 formed on both surfaces of the metal foil 14. There is. The metal foil 14 has a foil main body 14a having a rectangular shape in a plan view and a tab 14b integrated with the foil main body 14a. The foil main body portion 14a includes a lower end portion 14x, an upper end portion 14y opposite to the lower end portion 14x, and a pair of side end portions 14r and 14p connecting the lower end portion 14x and the upper end portion 14y to each other. The side end portions 14r and 14p intersect the lower end portion 14x and the upper end portion 14y. The tab 14b projects from the upper end portion 14y of the foil main body portion 14a so as to correspond to the position of the positive electrode terminal 4, and penetrates through the separator 10. The tab 14b is connected to the positive electrode terminal 4 via the conductive member 12. Note that the tab 14b is omitted in FIG. 2 for convenience.

The positive electrode active material layer 15 is formed on both front and back surfaces of the foil body 14a. The positive electrode active material layer 15 is a porous layer including a positive electrode active material and a binder. More specifically, it is formed by adhering a binder between a large number of particles (or particle agglomerates, secondary particles) of the positive electrode active material. Gaps (holes) are formed between the particles to the extent that they are impregnated with the electrolytic solution, but the holes are so small that they cannot be visually confirmed. Examples of the positive electrode active material include complex oxides, metallic lithium, sulfur and the like. The composite oxide contains, for example, at least one of manganese, nickel, cobalt, and aluminum and lithium.

The negative electrode 9 has a metal foil 16 which is a negative electrode current collector made of, for example, a copper foil, and negative electrode active material layers 17 formed on both surfaces of the metal foil 16. The metal foil 16 has a foil main body 16a having a rectangular shape in plan view and a tab 16b integrated with the foil main body 16a. The tab 16b projects from an edge near one end of the foil body 16a in the longitudinal direction. The tab 16b is connected to the negative electrode terminal 5 via the conductive member 13. Note that the tab 16b is omitted in FIG. 2 for convenience.

The negative electrode active material layer 17 is formed on both front and back surfaces of the foil body 16a. The negative electrode active material layer 17 is a porous layer formed by including a negative electrode active material and a binder. More specifically, a large number of particles of the negative electrode active material (or particle agglomerates, secondary particles) are formed by bonding a binder between the particles. Gaps (holes) are formed between the particles to the extent that they are impregnated with the electrolytic solution, but the holes are so small that they cannot be visually confirmed. Examples of the negative electrode active material include graphite, highly oriented graphite, carbon such as mesocarbon microbeads, hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5≦x≦1.5). ) And other metal oxides or boron-added carbon.

As an example, the separator 10 houses the positive electrode 8 therein. That is, the positive electrode 8 is wrapped in the bag-shaped separator 10. The separator 10 has a rectangular shape in plan view. The separator 10 is formed in a bag shape by welding a pair of long sheet-shaped separator members to each other. Specifically, the separator 10 is in the shape of a bag having an outer edge defined by a welded region W1, a welded region W2, a welded region W3, and a welded region W4, which are formed by welding separator members to each other. In FIG. 3, the front separator member is omitted, and the welding regions W1 to W4 are hatched for the sake of explanation.

The welding region W1 is a region that faces the side end 14r of the foil body 14a and extends along the side end 14r. The welding region W3 is a region that faces the side end 14p of the foil main body 14a and extends along the side end 14p. The welding region W2 is a region that faces the lower end 14x of the foil body 14a and extends along the lower end 14x. The welding region W4 is a region that faces the upper end 14y of the foil body 14a and extends along the upper end 14y. The welding region W1 to the welding region W4 are connected to each other in a rectangular ring shape. A non-welding region W5 is interposed between a plurality (here, two) of welding regions W4 that are separated from each other.

The separator 10 is open in the non-welded region W5. In the separator 10, the tab 14b projects through the non-welded region W5. Examples of the material of the separator 10 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), or a woven or non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose and the like. It should be noted that the welding region W1 to the welding region W4 may be formed intermittently, for example, in a dot shape, as long as the positive electrode 8 is not displaced in the separator 10.

The thickness of the positive electrode 8 is 100 μm, for example, in the present embodiment when the metal foil 14 and the positive electrode active material layer 15 are combined. On the other hand, the thickness of the separator 10 is 30 μm. It should be noted that, for convenience of explanation, the deformed drawings and the thicknesses of FIGS. 1 to 3 described above and the drawings described later are emphasized more than the actual ones. Although the thickness is an example in the present embodiment, in order to secure a large battery capacity, the positive electrode active material layer 15 is formed as thick as possible in manufacturing, and conversely, the separator 10 is an insulating layer between electrodes. It is set to a thin thickness within the range that can secure Therefore, the thickness relationship is set to satisfy the relationship of "thickness of positive electrode 8>thickness of separator 10". Further, the thickness of the separator 10 may be set to a fraction of the thickness of the positive electrode 8.

Next, the laminated electrode manufacturing apparatus 20 and the laminated body manufacturing apparatus 100 according to the embodiment of the present invention will be described with reference to FIGS. 4 to 6. FIG. 4A is a schematic plan view of the laminated body manufacturing apparatus 100 according to the present embodiment, and FIG. 4B is a schematic side view of the laminated portion. FIG. 5 is a schematic side view of the laminated electrode manufacturing apparatus 20 according to this embodiment. FIG. 6 is a diagram showing a state of a welding region when the separator member 18b is removed, and FIG. 6A shows a state when welding is performed by a heater roller 25 (welding portion) on a front stage side described later, FIG. 6B shows a state after welding is performed by the heater roller 26 (welding portion) on the rear side.

The laminated electrode manufacturing apparatus 20 is an apparatus for manufacturing a laminated electrode 40 in which one positive electrode 11 with a separator, in which the positive electrode 8 is covered with the separator 10 and is packaged, and one negative electrode 9 are laminated. The laminated body manufacturing apparatus 100 is an apparatus for manufacturing a laminated body 50 configured by laminating a plurality of laminated electrodes 40. As shown in FIG. 4A, the laminated body manufacturing apparatus 100 includes a positive electrode member supply section 101, a cutting section 102, an adsorption conveyor 103, a pressing section 104, adsorption conveyors 106 and 107, and a laminated electrode production apparatus. 20 and the laminating unit 110.

The positive electrode member supply unit 101 supplies a strip-shaped positive electrode member 108 that is a base material of the positive electrode 8. The positive electrode member supply unit 101 unwinds the positive electrode member 108 wound in a roll shape and supplies it to the cutting unit 102. The cutting unit 102 is composed of a rotary die cutter, and cuts the positive electrode member 108 to form the positive electrode 8. The suction conveyer 103 conveys the positive electrode 8 on the lower surface side while sucking it. The press unit 104 is composed of a press roller and presses the positive electrode 8. The adsorption conveyer 106 conveys the positive electrode 8 while adsorbing the positive electrode 8 on the lower surface side. The suction conveyor 107 conveys the positive electrode 8 with the upper surface sucked. The suction conveyors 103, 106, 107 inspect and clean the positive electrode 8.

The laminated portion 110 is a so-called pick-and-place type laminated portion. That is, the stacking unit 110 carries the stacked electrode 40 while gripping it, and stacks the stacked electrode 40 at another position. The conveyor 111, the gripper 112, and the stacking table 113 are provided. The conveyor 111 conveys the laminated electrode 40 manufactured by the laminated electrode manufacturing apparatus 20 in the conveying direction. The grip 112 is configured by a mechanism such as a robot arm that can grip the laminated electrode 40 and release the grip. The gripper 112 grips the laminated electrode 40 conveyed by the conveyor 111, and conveys the laminated electrode 40 to the stacking table 113 in the gripped state. When the laminated electrode 40 reaches the lamination base 113, the gripper 112 arranges the laminated electrode 40 on the lamination base 113. When the other stacked electrode 40 is already stacked on the stacking base 113, the gripper 112 stacks the new stacked electrode 40 on the existing stacked electrode 40 (see FIG. 4B). As a result, the stacked body 50 is formed on the stacking table 113. The completed laminated body 50 is transported to the next step by a transport mechanism (not shown) or the like.

Next, the laminated electrode manufacturing apparatus 20 will be described with reference to FIG. The laminated electrode manufacturing apparatus 20 welds the long sheet-shaped separator members 18a and 18b for the separator 10 to each other. Here, the laminated electrode manufacturing apparatus 20 forms the bag-shaped positive electrode housing separator member 118 (electrode housing separator member) that houses the positive electrode 8 by welding the separator members 18a and 18b. Further, the laminated electrode manufacturing apparatus 20 forms the laminated electrode member 42 by joining the negative electrode member 41 to the positive electrode containing separator member 118. Further, the laminated electrode manufacturing apparatus 20 cuts the laminated electrode member 42 to form the laminated electrode 40 in which the positive electrode 11 with the separator and the negative electrode 9 are laminated.

As shown in FIG. 5, the laminated electrode manufacturing apparatus 20 transports the positive electrode 8 supplied from the equipment of the previous process along a transport path (here, a path along the X axis) while the positive electrode 8 is stored in the positive electrode housing separator. Cover with member 118. The equipment of the previous step is, for example, the suction conveyor 107 of the laminated body manufacturing apparatus 100. The positive electrode 8 is conveyed by the adsorption conveyor 107 and supplied to the laminated electrode manufacturing apparatus 20. In the present embodiment, the adsorption conveyor 107 supplies the positive electrodes 8 arranged in two rows to the laminated electrode manufacturing apparatus 20. However, the positive electrodes 8 may be supplied in one row or three or more rows.

The laminated electrode manufacturing apparatus 20 includes a supply reel 21, a supply reel 22, a guide roller 23, a pressing roller 28, a guide roller 24, a heater roller 25, a heater roller 26, a supply reel 46, a conveying roller 27, and The cutting unit 31 and the receiving unit 32 are provided. The separator member 18a is wound into a roll to form a raw roll. The original roll is supported by the supply reel 21, and the supply reel 21 is rotated, whereby the separator member 18a is paid out from the original roll. The supply reel 21 supplies the separator member 18a from the one surface 8a side of the positive electrode 8 toward the transport path. The separator member 18b is paid out from the original roll by the rotation of the supply reel 22. The supply reel 22 supplies the separator member 18b from the other surface 8b opposite to the one surface 8a of the positive electrode 8 toward the transport path.

The guide roller 23 guides the separator member 18a supplied by the supply reel 21 along the transport path. The guide roller 23 is arranged on the one surface 8a side of the positive electrode 8. The guide roller 23 has a cylindrical shape, and rotates about a direction intersecting the transport path (here, the Y-axis direction) as a rotation axis. The separator member 18a guided by the guide roller 23 is transported along the transport path on the one surface 8a side of the positive electrode 8. Here, the positive electrode 8 is placed on the separator member 18a and conveyed integrally. Therefore, the upper surface of the separator member 18a forms the transport surface of the positive electrode 8.

The pressing roller 28 presses the positive electrode 8 toward the guide roller 23. The pressing roller 28 is provided so as to be vertically movable, and presses the positive electrode 8 toward the guide roller 23 side by, for example, an elastic member (not shown). The positive electrode 8 conveyed from the suction conveyor 107 enters between the pressure roller 28 and the guide roller 23 while pushing up the pressure roller 28, and is conveyed to the downstream side by the conveyance of the separator member 18a.

The guide roller 24 is arranged on the downstream side of the guide roller 23 in the transport path. The guide roller 24 guides the separator member 18b supplied by the supply reel 22 along the transport path. The guide roller 24 is arranged on the other surface 8b side of the positive electrode 8. The guide roller 24 has a columnar shape, and rotates about a direction intersecting the conveyance path (here, the Y-axis direction) as a rotation axis. The separator member 18b guided by the guide roller 24 is transported along the transport path on the other surface 8b side of the positive electrode 8.

The separator member 18b is conveyed downstream of the guide roller 24 in a state of being vertically opposed and substantially parallel to the separator member 18a that provides the conveyance surface of the positive electrode 8 as described above. In other words, the positive electrode 8 is sandwiched between the separator member 18a and the separator member 18b on the downstream side of the guide roller 24.

The heater rollers 25 and 26 form the positive electrode housing separator member 118 that covers the positive electrode 8 by welding the separator member 18 a and the separator member 18 b. In this embodiment, the heater roller 25 forms the welding area W6, and the heater roller 26 forms the welding areas W4 and W7. The positive electrode accommodating separator member 118 refers to a member that accommodates the positive electrode 8 in the welding regions W6, W4, W7 and before being cut by the cutting portion 31. The positive electrode containing separator member 118 covers the positive electrode 8 from below with the welded separator member 18a and covers the positive electrode 8 from above with the welded separator member 18b. In the area between the heater roller 25 and the heater roller 26, the positive electrode accommodating separator member 118 in which the movement of the positive electrode 8 in all directions is restricted is not completed. Therefore, in this state, the intermediate storage separator member 119 may be referred to in order to distinguish it from the positive electrode storage separator member 118. The intermediate accommodating separator member 119 covers the positive electrode 8 from the lower side with the separator member 18a after being partially welded, and covers the positive electrode 8 from the upper side with the separator member 18b after being partially welded.

The heater roller 25 is arranged so as to face the guide roller 24 with the separator members 18a and 18b interposed therebetween in a direction (here, the Z-axis direction) that intersects the transport path (transport surface). The heater roller 25 is arranged on the one surface 8a side (lower side) of the positive electrode 8 and below the separator member 18a. The heater roller 25 has a cylindrical shape and rotates about a direction intersecting the transport path (here, the Y-axis direction) as a rotation axis.

The heater roller 25 welds the separator members 18a and 18b, which are conveyed along the conveying path, to each other along the lateral direction thereof. Therefore, the heater roller 25 has, for example, a pair of convex portions 25s extending in the direction along the rotation axis thereof. The convex portion 25s may be a convex stripe, or may be an aggregate of a large number of protrusions. Here, the pair of convex portions 25s are formed on the sides opposite to each other by 180° in the radial direction of the heater roller 25. Further, the heater roller 25 has a heater inside thereof and is wholly heated. The heater roller 25 heats the separator members 18a and 18b to weld the separator members 18a and 18b to each other by bringing the top surface of the convex portion 25s heated by the heater into contact with the separator member 18a. As a result, the heater roller 25 forms the intermediate containing separator member 119 by welding the separator members 18a and 18b. Specifically, the heater roller 25 forms the welding area W6 (see FIG. 6). As a result, the positive electrode 8 is housed in the intermediate housing separator member 119 between the pair of welding regions W6 adjacent to each other while being separated from each other. The welded region W6 becomes the above-mentioned welded region W1 and welded region W3 by being cut.

The heater roller 26 is arranged on the downstream side of the guide rollers 23, 24 and the heater roller 25 in the transport path. The heater roller 26 has a pair of rollers 26a and 26b. The rollers 26a and 26b are arranged to face each other with the separator members 18a and 18b of the intermediate accommodating separator member 119 interposed therebetween along a direction (here, the Z-axis direction) that intersects the conveyance path (conveyance surface). .. The roller 26a is arranged on the one surface 8a side (lower side) of the positive electrode 8. The roller 26a is arranged below the separator member 18a. The roller 26b is arranged on the other surface 8b side (upper side) of the positive electrode 8. The roller 26b is arranged above the separator member 18b. Each of the rollers 26a and 26b has a cylindrical shape, and rotates about a direction intersecting the transport path (here, the Y-axis direction) as a rotation axis.

The heater roller 26 welds the separator members 18a and 18b of the intermediate accommodating separator member 119, which are conveyed along the conveying path, to each other along the longitudinal direction thereof. As an example, the heater roller 26 welds the separator members 18a and 18b of the intermediate accommodating separator member 119, which are conveyed along the conveying path, to each other along the edges extending in the longitudinal direction. One of the rollers 26a and 26b (here, the roller 26a) has three convex portions 26s extending along the circumferential direction thereof. The roller 26a has a heater inside. The convex portions 26s are formed at both ends in the Y-axis direction, and one convex portion 26s is formed at a central position.

The one of the three protrusions 26s at the center position extends in the entire circumferential direction of the roller 26a and has an annular shape. That is, the starting end and the ending end of the convex portion 26s coincide with each other. The ones at both ends of the three convex portions 26s do not extend over the entire circumferential direction of the roller 26a. That is, the start end and the end of these convex portions 26s do not coincide with each other, and a missing portion is provided between them. By contacting the respective top surfaces of the convex portions 26s heated by the heater with the separator member 18a of the intermediate storage separator member 119, the separator members 18a and 18b of the intermediate storage separator member 119 are heated to heat the intermediate storage separator member 119. The separator members 18a and 18b are welded to each other. Thus, the heater roller 26 forms the positive electrode containing separator member 118 by welding the separator members 18a and 18b of the intermediate containing separator member 119. Specifically, the roller 26a forms a welding region W4 and a welding region W7 (see FIG. 6). In the missing portion of the convex portion 25s, the separator members 18a and 18b are not welded to each other, and the non-welded region W5 is formed. The tab 14b of the positive electrode 8 projects from the non-welded region W5. Thereby, the positive electrode 8 is accommodated in the positive electrode accommodating separator member 118 between the pair of welding regions W6 and the welding regions W4 and W7 that are adjacent to each other while being separated from each other. The welding region W7 at the central position becomes the welding region W2 by being cut.

The negative electrode member 41 is wound into a roll to form a raw roll. The original fabric roll is supported by the supply reel 46, and the negative electrode member 41 is paid out from the original fabric roll by rotating the supply reel 46. The supply reel 46 supplies the negative electrode member 41 to the positive electrode housing separator member 118. In the present embodiment, the supply reel 46 is arranged below the positive electrode housing separator member 118 and supplies the negative electrode member 41 to the lower surface side of the positive electrode housing separator member 118. An adhesive layer 47 made of an adhesive is formed on the bonding surface of the negative electrode member 41. As a result, the negative electrode member 41 is bonded to the lower surface of the separator member 18a of the positive electrode housing separator member 118 via the adhesive layer 47. The negative electrode member 41 has a strip shape in which the negative electrodes 9 before cutting are arranged in two rows. The tab 16b is previously formed on the side edge portion of the negative electrode member 41. As shown in FIG. 7, the negative electrode member 41 is cut at the positions of the cut lines CL1 and CL2 by the cutting section 31 described later.

The transport roller 27 is arranged on the downstream side of the heater roller 26 in the transport path. The transport roller 27 transports the positive electrode housing separator member 118 and the negative electrode member 41, which are guided along the transport path, along the transport path. The transport roller 27 has a pair of rollers 27a and 27b. The rollers 27a and 27b are arranged to face each other with the positive electrode housing separator member 118 and the negative electrode member 41 interposed therebetween along a direction (here, the Z-axis direction) intersecting the transport path (transport surface). The rollers 27a and 27b each have a columnar shape, and rotate about a direction intersecting the transport path (here, the Y-axis direction) as a rotation axis. The rollers 27a and 27b rotate by a driving source (not shown) while sandwiching the positive electrode containing separator member 118 and the negative electrode member 41, thereby generating tension in the positive electrode containing separator member 118 and the negative electrode member 41, and driving in the transport direction. Do (carry). Further, the transport roller 27 can press the negative electrode member 41 against the separator member 18 a of the positive electrode containing separator member 118 by sandwiching the positive electrode containing separator member 118 and the negative electrode member 41 with the rollers 27 a and 27 b. As a result, the negative electrode member 41 is bonded to the lower surface of the separator member 18a of the positive electrode housing separator member 118 via the adhesive layer 47. Further, this forms the laminated electrode member 42 in which the negative electrode member 41 is joined to the positive electrode housing separator member 118.

The cutting unit 31 is arranged on the downstream side of the heater rollers 25 and 26, the supply reel 46, and the transport roller 27 in the transport path. The cutting section 31 forms the laminated electrode 40 by cutting the laminated electrode member 42. The cutting unit 31 cuts between the positive electrodes 8 that are adjacent to each other in the transport direction, at a position where the separator members 18a and 18b of the positive electrode housing separator member 118 face each other. That is, the cutting unit 31 cuts the positive electrode containing separator member 118 and the negative electrode member 41 at the positions of the welding regions W6 and W7 where the separator members 18a and 18b of the positive electrode containing separator member 118 are welded to each other.

The cutting part 31 forms the welding regions W1 and W3 by cutting the welding region W6. The cutting unit 31 cuts the positive electrode housing separator member 118 and the negative electrode member 41 between the positive electrodes 8 adjacent to each other in the Y-axis direction. As shown in FIG. 6B, the cutting unit 31 cuts the welding regions W6 and W7 and the negative electrode member 41 (see also FIG. 7) along the cut lines CL1 and CL2. The cut line CL1 is set at the center position of the welding region W6 in the width direction (X-axis direction). In addition, the cut line CL1 is set in the negative electrode member 41 at a position that becomes the short side of the negative electrode 9 after cutting. The cut line CL2 is set at the center position in the width direction (Y-axis direction) of the welding region W7. Further, the cut line CL2 is set at a position in the negative electrode member 41, which becomes the long side of the negative electrode 9 after cutting. The cutting part 31 forms the welding regions W1 and W3 by cutting the welding region W6, and also forms the short side of the negative electrode 9. The cutting part 31 forms the welding regions W2 and W4 by cutting the welding region W7, and also forms the long side of the negative electrode 9.

The cutting unit 31 is composed of a rotary cutter. Specifically, the cutting unit 31 has a pair of rollers 31a and 31b. The rollers 31a and 31b are arranged to face each other with the positive electrode housing separator member 118 interposed therebetween along a direction (here, the Z-axis direction) intersecting the transport path (transport surface). Each of the rollers 31a and 31b has a cylindrical shape, and rotates about a direction intersecting the transport path (here, the Y-axis direction) as a rotation axis. The roller 31b has a blade portion 31c for cutting the positive electrode housing separator member 118. The blade portion 31c for cutting the welding region W6 extends along the Y-axis direction and is provided at a predetermined pitch (here, 180° pitch) in the circumferential direction of the roller 31b. The blade portion 31d for cutting the welding region W7 extends along the circumferential direction of the roller 31b. The roller 31a does not have a blade portion, and the peripheral surface supports the positive electrode housing separator member 118 from the side opposite to the blade portion 31c. The rollers 31a and 31b are rotated by a drive source (not shown) while cutting the positive electrode housing separator member 118.

When being cut by the cutting unit 31, the negative electrode member 41 is arranged on the side of the separator member 18a of the positive electrode containing separator member 118 opposite to the blade portions 31c and 31d of the cutting unit 31. Therefore, at the time of cutting, the blade portions 31c and 31d cut the upper separator member 18b, the lower separator member 18b, and the negative electrode member 41 in this order.

The receiving unit 32 is arranged on the downstream side of the cutting unit 31 in the transport path. The receiving section 32 receives the laminated electrode member 42 before being cut by the cutting section 31, and enables the cutting by the cutting section 31 in a state where tension is applied. Further, the receiver 32 sends the cut laminated electrode 40 to the downstream side. The receiver 32 has nip rolls 32a and 32b. The nip rolls 32a and 32b are arranged to face each other across the separator 10 along a direction (here, the Z-axis direction) intersecting the transport path (transport surface). The nip rolls 32a and 32b each have a columnar shape, and rotate about a direction intersecting the transport path (here, the Y-axis direction) as a rotation axis. The nip rolls 32a and 32b are rotated by a driving source (not shown) while sandwiching the laminated electrode member 42, thereby driving (conveying) the laminated electrode member 42 (and the laminated electrode 40) in the conveying direction.

Here, the guide rollers 23 and 24, the pressing roller 28, the heater roller 25, and the heater roller 26 (rollers 26a and 26b) described above are driven rollers that rotate as the separator members 18a and 18b are conveyed. .. However, the guide rollers 23 and 24, the heater roller 25, and the heater roller 26 (rollers 26a and 26b) may be drive rollers having independent drive sources.

Next, the structure of the laminated electrode 40 manufactured by the laminated electrode manufacturing apparatus 20 as described above will be described with reference to FIG. In FIG. 8, the thickness of each member is emphasized for the sake of understanding. In the positive electrode 11 with a separator, the positive electrode 8 is housed so that the pair of separators 10 sandwich the positive electrode 8. The pair of separators 10 are welded to each other at the four edges. In FIG. 8A, the separators 10 are joined to each other at the joining portion BP1. The joint portion BP1 is arranged at a position corresponding to the welding area (see the welding areas W1, W3, W2 and W4 in FIGS. 3 and 6). With such a configuration, the positive electrode 8 is in a state in which its movement is regulated inside the pair of separators 10, and thus is substantially fixed to the pair of separators 10. The negative electrode 9 is joined to the outer surface of one separator 10 of the positive electrodes 11 with a separator. The negative electrode 9 is joined to the separator 10 via the joining portion BP2. At the joint portion BP2, the negative electrode 9 is joined by the adhesive layer 47. In addition, the negative electrode 9 is joined to a portion of the separator 10 where the positive electrode 8 is arranged, and is separated from the separator 10 at a portion corresponding to the welding region and is not joined. In FIG. 8A, the adhesive layer 47 is shown only at the bonding portion BP2, but the adhesive layer 47 is formed on the entire surface of the negative electrode 9, and the adhesive layer 47 is also provided at a position separated from the separator 10. It may be formed.

With the configuration as described above, the welded regions of the separator 10 (the welded regions W1, W3, W2 and W4 of FIGS. 3 and 6) and the joint portion BP2 of the negative electrode 9 with respect to the separator 10 are as viewed from the stacking direction. , Are arranged so that they are offset from each other. The positive electrode 8 is arranged so as to be surrounded by the welded region of the separator 10. Therefore, the welded region of the separator 10 is displaced from both the bonding portion BP2 and the positive electrode 8 when viewed from the stacking direction. The positive electrode 8 and the bonding portion BP2 are arranged so that at least a part thereof overlaps each other when viewed from the stacking direction.

The end surface of the separator 10 and the end surface of the negative electrode 9 are cut surfaces CF1 and CF2 formed by being cut by the cutting portion 31. Since the separator members 18a and 18b and the negative electrode member 41 are cut at the same time, the cut surface CF1 of the separator 10 and the cut surface CF2 of the negative electrode 9 are arranged at the same position when viewed in the stacking direction. The cut surface CF1 of the separator 10 formed by being cut by the cutting portion 31, the joining portion BP2 of the negative electrode 9 with respect to the separator 10, and the positive electrode 8 are arranged so as to be displaced from each other when viewed in the stacking direction. There is. Therefore, when viewed in the stacking direction, the cut surface CF1 overlaps only a portion of the negative electrode 9 that is not joined to the separator 10, and the cut portion CF1 is attached to the joining portion BP2 between the negative electrode 9 and the separator 10 and the separator 10. It does not overlap with the fixed positive electrode 8.

Next, operations and effects of the laminated electrode manufacturing apparatus 20 and the laminated body manufacturing apparatus 100 according to the present embodiment will be described.

A laminated electrode manufacturing apparatus according to a comparative example will be described with reference to FIG. 9. For example, in the laminated electrode manufacturing apparatus shown in FIG. 9A, after the base material of the separator 10 and the individual pieces of the positive electrode 8 and the negative electrode 9 are stacked, the respective sheets are joined and the base material of the separator 10 is cut. To do. In this laminated electrode manufacturing apparatus, the individual pieces of the positive electrode 8 and the negative electrode 9 are conveyed without being fixed from the stacking of the sheets to the joining. Therefore, the positive electrode 8 or the negative electrode 9 may be displaced. Such a problem becomes remarkable when the speed of the line is increased. In the laminated electrode manufacturing apparatus shown in FIG. 9B, the long base material of the positive electrode 8 and the base material of the separator 10 are stacked and then cut into individual pieces. Then, the base material of the negative electrode 9 is stacked on the positive electrode with the separator, and then cut into pieces. In this laminated electrode manufacturing apparatus, since the positive electrode 8 and the separator 10 are cut at the same time, burrs generated from the positive electrode 8 may extend to the opposite side of the separator 10, which may cause a short circuit.

The laminated electrode manufacturing apparatus 20 includes heater rollers 25 and 26 that cover the positive electrode 8 by welding the separator members 18a and 18b that are the base materials of the separator 10 to form the positive electrode housing separator member 118, and the positive electrode housing separator member 118. And a supply reel 46 that supplies the negative electrode member 41 that is the base material of the negative electrode 9. The cutting unit 31 also cuts the positive electrode housing separator member 118 and the negative electrode member 41 joined to the positive electrode housing separator member 118. As described above, when the negative electrode member 41 is supplied to the positive electrode housing separator member 118, the positive electrode 8 is housed in the positive electrode housing separator member 118, so that the position is fixed. In addition, the negative electrode member 41 is joined to the positive electrode containing separator member 118 at a stage before being cut into individual pieces of the negative electrode 9. Therefore, as compared with the case where the positive electrode 8 and the negative electrode 9 are superposed in the state of individual pieces and then joined, it is possible to suppress the occurrence of the positional deviation between the positive electrode 8 and the negative electrode 9. In particular, in the present embodiment, the negative electrode member 41 is supplied to the positive electrode housing separator member 118 and is simultaneously joined. Therefore, the positional deviation between the negative electrode 9 and the positive electrode 8 is further suppressed. Further, the cutting part 31 cuts the positive electrode containing separator member 118 and the negative electrode member 41 at the positions of the welding regions W6 and W7 where the separator members 18a and 18b are welded in the positive electrode containing separator member 118. In this case, since the positive electrode 8 is covered with the separator 10 and sealed by the welding regions W1, W2, W3, W4 even if burrs are generated on the individual pieces of the negative electrode 9, The burr is prevented from coming into contact with the positive electrode 8. As described above, it is possible to suppress the displacement of the electrodes 8 and 9 and the short circuit between the electrodes 8 and 9.

The negative electrode member 41 is joined to the positive electrode housing separator member 118 via the adhesive layer 47. In this case, the negative electrode member 41 can be easily joined to the positive electrode housing separator member 118.

The welded regions W1, W3, W2, W4 of the separator 10 and the joint portion BP2 of the negative electrode 9 with respect to the separator 10 are arranged so as to be displaced from each other when viewed in the stacking direction. In this way, by setting the welding regions W1, W3, W2, W4 of the separator 10 and the joint portion BP2 of the negative electrode 9 at different positions, it is possible to suppress deformation such as bending. That is, the positive electrode 8 does not exist in the welded regions W1, W3, W2, W4 of the separator 10, and the welded regions W1, W3, W2, W4 are locations that are crushed during welding. Therefore, in the separator 10, the welded regions W1, W3, W2, W4 are thinner than the portion containing the positive electrode 8. Therefore, if the negative electrode 9 is also joined to the welding regions W1, W3, W2, W4, only the outer peripheral edge of the negative electrode 9 is deformed in one of the stacking directions, which causes bending. Therefore, as described above, by offsetting the welded regions W1, W3, W2, W4 and the joint portion BP, such bending of the negative electrode 9 can be avoided.

When cut by the cutting unit 31, the negative electrode member 41 is arranged on the side of the positive electrode containing separator member 118 opposite to the blade portions 31c and 31d of the cutting unit 31. In this case, even if burrs are generated when the blade portion is inserted when the negative electrode 9 is cut, the burrs extend to the side opposite to the positive electrode housing separator member 118 in the entrance direction of the blade portion. Burr due to cutting of the negative electrode 9 may occur both when the blade is inserted and when the blade is pulled out, but care must be taken when inserting the blade in the direction in which the burr extends. Is. The burr extends along with the movement of the blade portion, but at the same time, when the blade portion enters, it is obstructed by the blade portion and the thickness of the blade portion gradually increases. Therefore, in the horizontal direction, the side opposite to the blade portion, That is, it is easy to extend to the positive electrode 8 side. In the above configuration, when the blade portion is inserted, the separator members 18a and 18b covering the positive electrode 8 are not provided in the entrance direction of the blade portion, so that the risk of short circuit can be suppressed regardless of the horizontal position of the burr.

The laminated body manufacturing apparatus 100 includes the laminated electrode manufacturing apparatus 20 described above, and a laminating unit 110 that laminates a plurality of laminated electrodes 40 into a laminated body 50.

According to the laminated body manufacturing apparatus 100, by using the laminated electrode manufacturing apparatus 20 described above, it is possible to manufacture the laminated body 50 in which the displacement of the electrodes 8 and 9 and the short circuit between the electrodes 8 and 9 are suppressed. .. Further, since the laminated electrode 40 in which the separator and the electrodes 8 and 9 are laminated can be laminated, the lamination can be performed at a high speed as compared with the case where the electrodes 8 and 9 are laminated alternately. Moreover, since both electrodes 8 and 9 can be positioned at the same time as being superimposed on the separator 10, the work can be further speeded up.

The present invention is not limited to the above embodiments.

For example, in the above-described embodiment, the negative electrode member 41 is supplied to the lower separator member 18a, but may be supplied to the upper surface of the upper separator member 18b (see, for example, FIG. 8B). ). In this case, the separator members 18a and 18b and the negative electrode member 41 can be simultaneously cut even if the cutting property of the cutting portion 31 is reduced.

As shown in FIG. 8B, the joint portion BP2 may not be formed over the entire surfaces of the negative electrode 9 and the separator 10, and may be formed partially. For example, the adhesive layer 47 may be arranged in a dot shape or a line shape. The adhesive layer 47 may be formed not only on the negative electrode member 41 side, but also on the lower surface of the separator member 18b, or on both surfaces. Further, the joining of the joining portion BP2 is not particularly limited as long as it is a method capable of joining not only the adhesive layer. Further, in the above-described embodiment, the negative electrode member 41 is joined to the separator member 18a at the same time as the supply, but the supply and the joining may not necessarily be the same, and pressure may be applied after the supply to perform the joining.

In addition, the welding region W4 of the welding regions according to the above-described embodiment can be omitted. In the case of the above-described configuration, for example, in the laminated electrode manufacturing apparatus 20, the convex portion 26s of the heater roller 26 is only one in the central portion. Also in this configuration, the first electrode (positive electrode) is positioned by the welding region in the direction along the transport path, and therefore is not displaced in the transport direction due to acceleration/deceleration during transport. During manufacture, a large load does not act on the first electrode in the direction intersecting the transport path, particularly on the outer side, and thus the positional deviation is suppressed by the friction with the separator acting on both surfaces of the first electrode. It Further, at the side that is cut at the same time as the second electrode, the separators are welded to each other as in the above-described embodiment, so that a short circuit due to burrs is suppressed.

Further, in the above-described embodiment, the transport roller 27 (27a, 27b) sandwiches the separator member that covers the first electrode (positive electrode) and the electrode member (base material of the negative electrode), but not only the sandwiching. For example, the roller 27a may be a heater roller. In this configuration, a so-called hot melt adhesive can be used as the adhesive.

The electrode housed in the separator 10 may be not only the positive electrode 8 but also the negative electrode 9.

The current collector is not limited to the metal foil as long as the active material mixture can be applied. For example, a woven or mesh sheet may be used.

The power storage device can also be applied to power storage devices other than secondary batteries, such as capacitors. The secondary battery may be a lithium ion secondary battery or another secondary battery. The point is that it is sufficient if ions are transferred between the positive electrode active material and the negative electrode active material, and charges are transferred.

8... Positive electrode (first electrode), 9... Negative electrode (second electrode), 10... Separator, 18a, 18b... Separator member, 20... Laminated electrode manufacturing apparatus, 25, 26... Heater roller (welding part), 31... Cutting section, 31c... Blade section, 40... Laminated electrode, 46... Supply reel, 47... Adhesive layer, 100... Laminated body manufacturing apparatus, 110... Laminated section, 118... Positive electrode containing separator member (electrode containing separator member).

Claims (5)

A laminated electrode manufacturing apparatus for manufacturing a laminated electrode in which an electrode with a separator, in which the first electrode is covered with a separator and packaged while the first electrode is being conveyed along a conveying path, and a second electrode are laminated. hand,
A welded portion that covers the first electrode by forming an electrode-accommodating separator member by welding a separator member that is a base material of the separator,
A supply unit that supplies an electrode member, which is a base material of the second electrode, to the electrode-accommodating separator member,
Provided on the downstream side of the welding unit and the supply unit, the electrode accommodating separator member, and a cutting unit for cutting the electrode member joined to the electrode accommodating separator member,
The laminated electrode manufacturing apparatus, wherein the cutting part cuts the electrode containing separator member and the electrode member at a position of a welding region of the electrode containing separator member. The laminated electrode manufacturing apparatus according to claim 1, wherein the electrode member is bonded to the electrode housing separator member via an adhesive layer. The laminated electrode manufacturing apparatus according to claim 1, wherein the welded region of the separator and the joint portion of the second electrode with respect to the separator are arranged so as to be displaced from each other when viewed from the stacking direction. When being cut by the cutting part, the electrode member is arranged on the side opposite to the blade part of the cutting part with respect to the electrode housing separator member, any one of claims 1 to 3. The laminated electrode manufacturing apparatus described. A laminated electrode manufacturing apparatus according to any one of claims 1 to 4,
A laminated body manufacturing apparatus, comprising: a laminated portion that laminates a plurality of the laminated electrodes into a laminated body.

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