JP6844543B2 - Laminating device and electrode laminating method - Google Patents

Description

The present invention relates to a laminating apparatus and an electrode laminating method.

As a conventional laminating device, for example, the device described in Patent Document 1 is known. The laminating device described in Patent Document 1 is located at a supply mechanism for supplying electrodes which are sheet-like bodies, and an electrode supplied from the supply mechanism at a predetermined position by using gravity. It is provided with a drop moving means for dropping and moving the electrode, and a guide stacking means which is arranged below the fall moving means and guides the electrodes discharged from the discharging portion of the falling moving means to a predetermined position in order to stack the electrodes. .. The guide laminating means includes a bottom wall on which the laminated body is placed and a vertical wall that is projected perpendicular to the bottom wall and stops the movement of the electrodes discharged from the discharging portion of the falling moving means to be positioned. have.

Japanese Unexamined Patent Publication No. 2012-19372

In the above-mentioned prior art, there are the following problems in order to further increase the speed of lamination. That is, in order to increase the stacking speed, it is necessary to increase the stacking speed. Assuming the configuration described in Patent Document 1, there are two measures for increasing the stacking speed of the electrodes (sheet-like bodies): shortening the distance between the electrodes when supplying the electrodes and increasing the supply speed of the electrodes. A method is conceivable. However, in order for different electrodes that slide and move on the falling moving means not to interfere with each other, it is necessary to secure a certain distance between the electrodes. Therefore, it is difficult to shorten the distance between the electrodes. Further, in the apparatus described in Patent Document 1, since the electrodes are dropped from the supply mechanism and supplied, the supply speed of the electrodes cannot be adjusted. At this time, it is possible to increase the supply speed of the electrodes by supplying the electrodes by giving the initial speed to the electrodes, for example, instead of simply dropping the electrodes. However, the initial velocity applied to the electrode, together with the falling velocity of the electrode, acts as an impact on the electrode when it collides with the standing wall for positioning. Therefore, in terms of electrode quality control, it is not preferable to simply increase the supply speed.

An object of the present invention is to provide a laminating apparatus and a laminating method capable of improving the laminating speed of sheet-like bodies.

The laminating device according to one aspect of the present invention transports a laminating portion having a laminating table on which the first sheet and the second sheet constituting the sheet-like body are laminated and the first sheet in the horizontal direction toward the laminating portion. The first transport portion is arranged so as to face the first transport portion with the laminated portion interposed therebetween, and the second transport portion that transports the second sheet in the horizontal direction toward the laminated portion and the second transport portion are arranged above the stacking table. , The first collision wall portion that collides the first sheet transported by the first transport portion and drops it onto the laminated portion, and the second transport portion that is arranged above the stacking table so as to face the first collision wall portion. It is characterized by including a second collision wall portion that collides the second sheet conveyed by the above and drops it onto the laminated portion.

In such a laminating device, the first sheet horizontally transported by the first transporting portion collides with the first collision wall portion and falls to the laminating portion, and is horizontally conveyed by the second transporting portion. When the second sheet collides with the second collision wall portion and falls to the laminated portion, the first sheet and the second sheet are sequentially laminated on the laminated portion. At this time, since the first sheet and the second sheet merge on the same path above the laminating table and overlap in the laminating direction, the distance between the first sheet and the second sheet is shortened to form a sheet-like body. It is possible to improve the stacking speed of. Further, since the number of sheet-like bodies transported by one transport unit is reduced by having a plurality of transport units, it is possible to suppress an increase in the transport speed (corresponding to the supply speed) of the sheet-like bodies.

The laminating device according to another aspect of the present invention has a laminating portion having a laminating table on which the first sheet and the second sheet constituting the sheet-like body are laminated, and the first sheet is horizontally conveyed toward the laminating portion. The first transport section is arranged so as to face the first transport section with the laminated section sandwiched between the first transport section, and the second transport section that horizontally transports the second sheet toward the laminated section, and the first transport section are laminated. The first collision wall portion is located on the extension line of the first transport portion toward the portion and is arranged between the stacking table and the transport surface of the second transport portion so as to face the first collision wall portion. It is characterized by being located on an extension line of the second transport portion from the second transport portion toward the laminated portion and having a second collision wall portion arranged between the stacking table and the transport surface of the first transport portion. And.

In such a laminating device, the first sheet horizontally transported by the first transporting portion collides with the first collision wall portion and falls to the laminating portion, and is horizontally conveyed by the second transporting portion. When the second sheet collides with the second collision wall portion and falls to the laminated portion, the first sheet and the second sheet are sequentially laminated on the laminated portion. At this time, since the first sheet and the second sheet merge on the same path above the laminating table and overlap in the laminating direction, the distance between the first sheet and the second sheet is shortened to form a sheet-like body. It is possible to improve the stacking speed of. Further, since the number of sheet-like bodies transported by one transport unit is reduced by having a plurality of transport units, it is possible to suppress an increase in the transport speed (corresponding to the supply speed) of the sheet-like bodies.

The laminated portion is erected on a laminating table and has a positioning wall for positioning the sheet-like body, and the first collision wall portion and the second collision wall portion may be integrated with the positioning wall. In this case, the laminated portion, the first collision wall portion, and the second collision wall portion can be integrally formed, and the number of parts of the laminating device is reduced. As a result, the cost can be reduced.

The surfaces at which the sheet-like bodies collide with each other in the first collision wall portion and the second collision wall portion are the first collision wall portion and the second collision wall portion toward the upper end surfaces of the first collision wall portion and the second collision wall portion. It may have a tapered portion that widens the width between them. In this case, the first sheet that collided with the first collision wall portion and the second sheet that collided with the second collision wall portion are smoothly supplied to the laminated portion.

The positioning wall has a plurality of side wall portions that come into contact with both side edges of the sheet-like body to align the positions of both side edges of the sheet-like body, and contact the bottom edges of the sheet-like body to align the positions of the bottom edges of the sheet-like body. The stacking table has a bottom wall portion and is inclined with respect to the horizontal direction so that the bottom wall portion is located on the lower side, and the first collision wall portion and the second collision wall portion have a plurality of side wall portions. May be integrated with each other. In this case, when the sheet-like body is supplied to the laminated portion, the sheet-like body slides down along the laminating table, and the bottom edge of the sheet-like body comes into contact with the bottom wall portion for positioning. When the sheet-like body slides down along the laminating table and the bottom edge of the sheet-like body collides with the bottom wall portion, the sheet-like body bounces according to the speed at that time. If the speed at the time of collision of the sheet-like body is high, the bounce of the sheet-like body becomes large, so that it takes a long time for the operation of the sheet-like body to converge, and during that time, the next sheet-like body is supplied to the stacking table. I can't. However, by integrating the first collision wall portion and the second collision wall portion with the side wall portion, the falling distance of the sheet-like body with respect to the laminated portion can be shortened. Therefore, the speed at which the sheet-like body collides with the bottom wall portion can be reduced, and the bounce of the sheet-like body can be suppressed to be small.

The laminating device further includes an air blow that blows air onto the sheet-like body that has already been laminated on the laminating portion, and the sheet-like body is integrated with the main body and the main body, and is laminated on the laminating portion from the laminating table. The air blow may have a protruding portion that protrudes, and the protruding portion may be bent downward by blowing air onto the protruding portion of the sheet-like body that has already been laminated on the laminated portion.

When the height position of the laminated portion is brought closer to the height position of the first transport portion and the second transport portion, the falling distance of the sheet-like body with respect to the laminated portion becomes short. However, if the height position of the laminated portion is too close to the height position of the first transport portion and the second transport portion, the sheet-like body transported by the first transport portion and the second transport portion is moved to the first collision wall portion and the second transport portion. When colliding with the second collision wall portion, the sheet-like body may interfere with the protruding portion of the sheet-like body already laminated on the laminated portion. Therefore, when the sheet-like bodies transported by the first transport section and the second transport section collide with the first collision wall portion and the second collision wall portion, respectively, the protruding portion of the sheet-like body already laminated on the laminated portion By blowing air and bending the protruding portion downward, it is possible to prevent the sheet-like body transported by the first transport portion and the second transport portion from interfering with the protruding portion of the sheet-like body already laminated on the laminated portion. To. As a result, it is possible to shorten the fall distance of the sheet-like body with respect to the laminated portion while preventing damage to the protruding portion of the sheet-like body already laminated on the laminated portion.

The laminating device further includes a cover arranged above the laminating portion and a driving portion for moving the cover, and the sheet-like body has a main body portion and a protruding portion integrated with the main body portion to drive the laminating device. The cover may be moved between a position for covering the protruding portion of the sheet-like body in a state of being laminated on the laminated portion and a position for retracting the laminated portion.

When the height position of the laminated portion is brought closer to the height position of the first transport portion and the second transport portion, the falling distance of the sheet-like body with respect to the laminated portion becomes short. However, if the height position of the laminated portion is too close to the height position of the first transport portion and the second transport portion, the sheet-like body transported by the first transport portion and the second transport portion is moved to the first collision wall portion and the second transport portion. When colliding with the second collision wall portion, the sheet-like body may interfere with the protruding portion of the sheet-like body already laminated on the laminated portion. Therefore, when the sheet-like bodies transported by the first transport section and the second transport section collide with the first collision wall portion and the second collision wall portion, respectively, the protruding portion of the sheet-like body already laminated on the laminated portion is formed. By covering with the cover, it is possible to prevent the sheet-like body transported by the first transport portion and the second transport portion from interfering with the protruding portion of the sheet-like body already laminated on the laminated portion. As a result, it is possible to shorten the fall distance of the sheet-like body with respect to the laminated portion while preventing damage to the protruding portion of the sheet-like body already laminated on the laminated portion.

A cushioning material may be attached to the surfaces of the first collision wall portion and the second collision wall portion where the sheet-like bodies collide. In this case, since the impact when the sheet-like body collides with the first collision wall portion and the second collision wall portion is alleviated, the damage given to the sheet-like body can be reduced.

The second collision wall portion is formed with a first suction portion that sucks the first sheet that is conveyed by the first transport portion and collides with the first collision wall portion, and the first collision wall portion has a second transport portion. A second suction portion may be formed to suck the second sheet that is conveyed by the vehicle and collides with the second collision wall portion. In this case, when the first sheet is supplied from the first transport unit, the first suction unit sucks the first sheet from the second collision wall portion side, so that the second collision wall portion of the first sheet The side area can be lowered downwards. As a result, the movement path of the second sheet transported from the second transport unit can be secured at an early stage. Further, when the second sheet is supplied from the second transport unit, the second suction unit sucks the second sheet from the first collision wall portion side, so that the region of the second sheet on the first collision wall portion side. Can be lowered downwards. As a result, the movement path of the first sheet transported from the first transport unit can be secured at an early stage. As described above, it is possible to shorten the time interval when supplying each sheet from each transport unit.

The first suction part is inclined diagonally upward, and the area on the second collision wall side of the first sheet at the time of collision with the first collision wall part is sucked, and the second suction part is diagonally upward. Of the second sheet at the time of collision with the second collision wall portion, the region on the first collision wall portion side may be sucked. In this case, the first suction portion can lower the region of the first sheet on the side of the second collision wall portion earlier. In addition, the second suction portion can lower the region of the second sheet on the side of the first collision wall portion earlier.

Depending on the supply of the first sheet from the first transport unit and the supply of the second sheet from the second transport unit, the first suction unit and the second suction unit may alternately perform suction. In this case, when the first sheet is being supplied, the posture of the first sheet can be controlled more appropriately by sucking only with the first suction unit. Further, when the second sheet is supplied, the posture of the second sheet can be controlled more appropriately by sucking only with the second suction unit.

The first suction portion is arranged on the center side of the first sheet when being supplied from the first transport portion in the width direction of the first transport portion, and the second suction portion is arranged in the width direction of the second transport portion. It may be arranged on the center side of the second sheet when it is supplied from the second transport unit. In this case, since the first suction unit can suck the vicinity of the center in the width direction of the first sheet supplied from the first transport unit, the posture of the first sheet can be controlled more appropriately. Since the second suction unit can suck the vicinity of the center of the second sheet supplied from the second transport unit in the width direction, the posture of the second sheet can be controlled more appropriately.

The first sheet and the second sheet are electrodes which are positive electrodes and negative electrodes having tabs protruding from one side of a rectangular main body portion, and one side thereof is parallel to the first transport direction on the first transport portion. An electrode is arranged so that the tab is located upstream in the transport direction, and a second electrode is placed on the second transport portion so that one side is parallel to the second transport direction and the tab is located upstream in the transport direction. May be placed. In this case, the tab is located on the transport portion side when the electrodes are laminated on the laminated portion. Therefore, when the positive electrode is supplied to the laminated portion, the positive electrode interferes only with the tab of the positive electrode already laminated on the laminated portion, and when the negative electrode is supplied to the laminated portion, the negative electrode is already laminated on the laminated portion. It will interfere only with the tab of the negative electrode of. This makes it possible to reduce the number of times the supplied electrodes interfere with the tabs of the laminated electrodes.

The stacking table may be inclined with respect to the horizontal direction so that the tabs of the electrodes laminated on the laminated portion face upward. In this case, since the tabs of the positive electrode and the negative electrode laminated on the laminated portion are located on the upper side, the supplied positive electrode and the negative electrode have already been laminated depending on the orientation of the tabs when the positive electrode and the negative electrode are supplied to the laminated portion. It is easy to interfere with both the positive electrode and negative electrode tabs. However, by placing the electrodes on the transport section so that one side is parallel to the transport direction and the tabs are located upstream in the transport direction, the number of times the supplied electrodes interfere with the tabs of the laminated electrodes is increased. It can definitely be reduced.

Here, as a conventional electrode laminating method, for example, a technique performed by using an apparatus described in Japanese Patent Application Laid-Open No. 2012-91372 is known. The apparatus described in Japanese Patent Application Laid-Open No. 2012-91372 is arranged so as to be orthogonal to each other two supply mechanisms for supplying the positive electrode and the negative electrode, which are electrodes, and below these supply mechanisms, respectively, from each supply mechanism. Two drop moving means for dropping and moving the supplied positive electrode and negative electrode to a predetermined position by using gravity, and arranged below these drop moving means, they are discharged from the discharging part of each falling moving means. It is provided with a guide laminating means for sequentially guiding the positive electrode and the negative electrode to a predetermined position and laminating them. There are two guide laminating means, one is the bottom wall on which the laminated body is placed, and the other is the electrode that is projected perpendicular to the bottom wall and is ejected from the discharging portion of the falling moving means to stop and position the electrode. It has a vertical wall. When laminating the positive electrode and the negative electrode, the positive electrode is supplied in the direction facing one of the standing walls, and the negative electrode is supplied in the direction facing the other standing wall. The positive electrode and the negative electrode supplied to the guide laminating means fall on the bottom wall or the laminated positive electrode and the negative electrode, and then collide with the vertical wall to stop.

By the way, in the laminated type electrode to which the electrode laminating method is applied, the structure of the electrode having a tab is known as in Japanese Patent Application Laid-Open No. 2012-220326. That is, the positive electrode has a rectangular positive electrode main body portion on which the positive electrode active material layer is formed, and a positive electrode tab that protrudes from one side of the positive electrode main body portion and is connected to the positive electrode terminal. The negative electrode has a rectangular negative electrode main body portion on which a negative electrode active material layer is formed, and a negative electrode tab that protrudes from one side of the negative electrode main body portion and is connected to a negative electrode terminal. When these positive electrodes and negative electrodes are laminated, the positive electrodes and negative electrodes are arranged so that the positive electrode tab and the negative electrode tab do not overlap each other. However, when such a positive electrode and a negative electrode with a tab are laminated as in Patent Document 1, if the positive electrode is supplied in the direction facing one standing wall and the negative electrode is supplied in the direction facing the other standing wall. , Either the positive electrode or the negative electrode may interfere with both the positive electrode tab of the laminated positive electrode and the negative electrode tab of the negative electrode. In this case, the supplied electrodes will interfere twice with the same tab of the laminated electrodes. Since the strength of the tabs of the electrodes is weak, if the supplied electrodes interfere with the same tabs of the laminated electrodes twice, the tabs are likely to be bent, broken, or damaged.

Therefore, one aspect of the present invention is an electrode laminating method in which electrodes which are positive electrodes and negative electrodes having tabs protruding from one side of a rectangular main body are transported and laminated using different transport paths, in which the upper surface is a transport path. A supply process in which electrodes are placed so that one side is parallel to the transport direction and the tab is located on the upstream side in the transport direction, and an electrode mounted on the transport section is placed downstream in the transport direction. Includes a transport step of transporting toward the side and a stacking step of dropping electrodes from one end of the transport path and laminating them on a laminated portion which is adjacent to the transport portion and is arranged at a position lower than the upper surface of the transport portion. It is characterized by.

In such an electrode stacking method, the electrodes are placed on the transport portion so that one side is parallel to the transport direction and the tab is located on the upstream side in the transport direction, and the electrodes are directed to the downstream side in the transport direction. By transporting, the tab is located on the transporting portion side in the state where the electrodes are laminated on the laminated portion. Therefore, when the positive electrode is supplied to the laminated portion, the positive electrode interferes only with the tab of the positive electrode already laminated on the laminated portion, and when the negative electrode is supplied to the laminated portion, the negative electrode is already laminated on the laminated portion. It will interfere only with the tab of the negative electrode of. This makes it possible to reduce the number of times the supplied electrodes interfere with the tabs of the laminated electrodes.

The laminating portion has a laminating table on which the electrodes are placed and a positioning wall that is erected on the laminating table and positions the electrodes. The laminating table has the tabs of the electrodes laminated on the laminated portion facing upward. May be tilted with respect to the horizontal direction. In this case, since the tabs of the positive electrode and the negative electrode laminated on the laminated portion are located on the upper side, the supplied positive electrode and the negative electrode have already been laminated depending on the orientation of the tabs when the positive electrode and the negative electrode are supplied to the laminated portion. It is easy to interfere with both the positive electrode and negative electrode tabs. However, by placing the electrodes on the transport section so that one side is parallel to the transport direction and the tabs are located upstream in the transport direction, the number of times the supplied electrodes interfere with the tabs of the laminated electrodes is increased. It can definitely be reduced.

According to the present invention, there is provided a laminating apparatus capable of improving the laminating speed of sheet-like bodies.

It is sectional drawing which shows the internal structure of the power storage device manufactured by applying the stacking device which concerns on embodiment of this invention. FIG. 2 is a sectional view taken along line II-II of FIG. It is a top view of the positive electrode with a separator and the negative electrode shown in FIG. It is a front view which shows the stacking apparatus which concerns on 1st Embodiment of this invention. It is a top view of the stacking apparatus shown in FIG. It is a side sectional view of the stacking apparatus shown in FIG. 4 (schematic sectional view taken along line VI-VI of FIG. 5). It is a side view (including a part cross section) which shows the laminating apparatus as a comparative example. It is a front view of the laminating apparatus shown in FIG. 7. It is a front view which shows the stacking apparatus which concerns on 2nd Embodiment of this invention, and is the figure which corresponds to FIG. It is a side sectional view of the laminating apparatus shown in FIG. 9, and is the figure corresponding to FIG. It is a schematic side view which shows the state which air was blown to the negative electrode tab of the negative electrode by the air blow shown in FIG. It is a front view which shows the modification of the stacking apparatus which concerns on 2nd Embodiment of this invention, and is the figure which corresponds to FIG. It is a side sectional view of the laminating apparatus shown in FIG. 12, and is the figure corresponding to FIG. It is a schematic side view which shows the state of moving the cover shown in FIG. It is a schematic front view which shows the state of moving the cover shown in FIG. As a modification, it is a front view which shows the laminating apparatus provided with the movable laminating part. It is a front view which shows the laminating apparatus which concerns on a modification. It is an enlarged view which shows the structure of the vicinity of the collision wall part of FIG. It is a side sectional view of the laminating apparatus shown in FIG. 17, and is the figure corresponding to FIG. It is a top view which shows the stacking apparatus which concerns on the modification. It is a front view which shows the laminating apparatus which concerns on a modification. It is a front view which shows the laminating apparatus used in the electrode laminating method which concerns on one Embodiment of this invention. It is a top view of the stacking apparatus shown in FIG. It is a side sectional view of the laminating apparatus shown in FIG. 22. It is a schematic plan view which shows the method of supplying an electrode to a laminated part in the electrode stacking method as a comparative example. It is a schematic plan view which shows the method of supplying an electrode to a laminated part in the electrode stacking method which concerns on one Embodiment of this invention. It is a conceptual diagram of the stacking apparatus which concerns on a modification. It is a side view which shows the state which the electrode unit is conveyed by the conveying part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a cross-sectional view showing an internal configuration of a power storage device manufactured by applying the stacking device according to the embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. In each figure, the power storage device 1 is a lithium ion secondary battery having a laminated electrode assembly.

The power storage device 1 includes, for example, a case 2 having a substantially rectangular parallelepiped shape, and an electrode assembly 3 housed in the case 2. The case 2 is made of a metal such as aluminum. Although not shown, a non-aqueous (organic solvent-based) electrolytic solution is injected into the case 2. The positive electrode terminal 4 and the negative electrode terminal 5 are arranged on the case 2 so as to be separated from each other. The positive electrode terminal 4 is fixed to the case 2 via the insulating ring 6, and the negative electrode terminal 5 is fixed to the case 2 via the insulating ring 7. Further, although not shown, an insulating film is attached to the side surface and the bottom surface inside the case 2, and the case 2 and the electrode assembly 3 are insulated by the insulating film. In FIG. 1, for 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. It is in contact with the bottom. By arranging the spacer between the electrode assembly 3 and the case 2, a gap may be formed between the electrode assembly 3 and the case 2.

The electrode assembly 3 has a structure in which a plurality of positive electrodes 8 and a plurality of negative electrodes 9 are alternately laminated via a bag-shaped separator 10. The positive electrode 8 is wrapped in a bag-shaped separator 10. The positive electrode 8 in a state of being 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 laminated. The positive electrode 11 with a separator and the negative electrode 9 form a sheet-like body. The positive electrode 11 with a separator is the first sheet, and the negative electrode 9 is the second sheet.

As shown in FIG. 3A, the separator 10 has a rectangular shape in a plan view. The horizontal dimension of the separator 10 (dimension in the X direction in the drawing) is larger than the vertical dimension of the separator 10 (dimension in the Y direction in the drawing). The positive electrode 8 has a rectangular positive electrode main body 8a in a plan view and a positive electrode tab 8b integrated with the positive electrode main body 8a. The horizontal dimension of the positive electrode body 8a is larger than the vertical dimension of the positive electrode body 8a. The positive electrode tab 8b constitutes a protruding portion protruding from the edge of the positive electrode main body 8a in the vicinity of one end in the lateral direction (longitudinal direction). The positive electrode tab 8b penetrates the separator 10. As shown in FIG. 1, the positive electrode tab 8b is connected to the positive electrode terminal 4 via the conductive member 12.

As shown in FIG. 3B, the negative electrode 9 has a rectangular negative electrode main body 9a in a plan view and a negative electrode tab 9b integrated with the negative electrode main body 9a. The horizontal dimension of the negative electrode body 9a is larger than the vertical dimension of the negative electrode body 9a. The negative electrode tab 9b constitutes a protruding portion protruding from the edge of the negative electrode main body 9a in the vicinity of one end in the lateral direction (longitudinal direction). As shown in FIG. 1, the negative electrode tab 9b is connected to the negative electrode terminal 5 via the conductive member 13.

As shown in FIG. 2, the positive electrode 8 has, for example, a metal foil 14 made of aluminum foil and a positive electrode active material layer 15 formed on both sides of the metal foil 14. The positive electrode active material layer 15 is formed in the metal foil 14 in a region excluding the edge portion of the positive electrode main body 8a on the positive electrode tab 8b side and the positive electrode tab 8b. In FIG. 2, the positive electrode tab 8b is omitted for convenience. The positive electrode active material layer 15 is a porous layer formed by containing the positive electrode active material and the binder. Examples of the positive electrode active material include composite oxides, metallic lithium, sulfur and the like. Composite oxides include, for example, at least one of manganese, nickel, cobalt and aluminum and lithium.

As shown in FIG. 2, the negative electrode 9 has, for example, a metal foil 16 made of copper foil and negative electrode active material layers 17 formed on both sides of the metal foil 16. The negative electrode active material layer 17 is formed in the metal foil 16 in a region excluding the edge portion of the negative electrode main body 9a on the negative electrode tab 9b side and the negative electrode tab 9b. In FIG. 2, the negative electrode tab 9b is omitted for convenience. The negative electrode active material layer 17 is a porous layer formed by containing the negative electrode active material and the binder. Examples of the negative electrode active material include graphite, highly oriented graphite, mesocarbon microbeads, carbon such as hard carbon and soft carbon, alkali metals such as lithium and sodium, metal compounds, and SiOx (0.5 ≦ x ≦ 1.5). ) And other metal oxides or boron-added carbon and the like.

Examples of the material for forming the separator 10 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), or a woven fabric or non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose and the like. ..

When manufacturing the power storage device 1 configured as described above, first, the positive electrode 11 with a separator and the negative electrode 9 are manufactured, and then the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated to obtain a laminated body. After that, the electrode assembly 3 is obtained by fixing the positive electrode 11 with a separator and the negative electrode 9 constituting the laminated body. Then, the positive electrode tab 8b of the positive electrode 8 is connected to the positive electrode terminal 4 via the conductive member 12, the negative electrode tab 9b of the negative electrode 9 is connected to the negative electrode terminal 5 via the conductive member 13, and then the electrode assembly 3 is cased. It is housed in 2.

The laminating device of this embodiment is an device related to the formation of the above-mentioned laminated body. FIG. 4 is a front view showing a laminating apparatus according to the first embodiment of the present invention. 5 is a plan view of the stacking device shown in FIG. 4, and FIG. 6 is a side sectional view of the stacking device shown in FIG. 4 (schematic sectional view taken along line VI-VI of FIG. 5).

In each figure, the laminating device 20 of the present embodiment is a device for alternately laminating a positive electrode 11 with a separator and a negative electrode 9 at high speed. The laminating device 20 includes a laminating portion 21 for laminating a positive electrode 11 with a separator and a negative electrode 9, and a transporting portion 22 (first transporting portion) and a conveying portion 23 (first transporting unit) arranged so as to face each other with the laminated portion 21 interposed therebetween. (2), and a collision wall portion 24 (first collision wall portion) and a collision wall portion 25 (second collision wall portion) arranged above the laminated portion 21 so as to face each other are provided.

The laminating portion 21 has a laminating table 26 on which the positive electrode 11 with a separator and the negative electrode 9 are laminated, and a positioning wall 27 standing on the laminating table 26 for positioning the positive electrode 11 with a separator and the negative electrode 9.

The positioning wall 27 includes a pair (plurality) of side wall portions 28 that come into contact with both side edges of the positive electrode 11 with a separator and the negative electrode 9 to align the positions of both side edges of the positive electrode 11 with a separator and the negative electrode 9, and the positive electrode 11 and the negative electrode with a separator. It has a positive electrode 11 with a separator and a bottom wall portion 29 that aligns the positions of the bottom edges of the negative electrode 9 in contact with the bottom edge of 9. The bottom edge of the positive electrode 11 with a separator is the edge of the positive electrode 11 with a separator opposite to the positive electrode tab 8b. The bottom edge of the negative electrode 9 is the edge of the negative electrode 9 opposite to the negative electrode tab 9b. The side wall portion 28 and the bottom wall portion 29 may be formed continuously or intermittently as shown in the drawing.

The stacking table 26 is inclined at a predetermined angle with respect to the horizontal direction so that the bottom wall portion 29 is located on the lower side. In a state where the positive electrode 11 with a separator and the negative electrode 9 are laminated on the laminated portion 21, the entire positive electrode 11 and the negative electrode 9 with a separator are placed on the laminated surface of the laminating table 26.

The transport section 22 transports the positive electrode 11 with a separator in the horizontal direction toward the laminated section 21. The transport unit 22 has a transport surface 22a on which the positive electrode 11 with a separator is placed. The transport portion 23 is arranged so as to face the transport portion 22 with the laminated portion 21 interposed therebetween, and transports the negative electrode 9 in the horizontal direction toward the laminated portion 21. The transport unit 23 has a transport surface 23a on which the negative electrode 9 is placed. The transport surfaces 22a and 23a are flush with each other. The horizontal direction referred to here includes not only a completely horizontal direction but also a direction slightly inclined with respect to the horizontal direction. The transport units 22 and 23 are belt conveyors. The transport units 22 and 23 have a belt 32 that is hung on the drive pulley 30 and the driven pulley 31. The drive pulley 30 is rotationally driven by a motor (not shown). The transport units 22 and 23 are not particularly limited to the belt conveyor, and may be a roller conveyor or the like.

The collision wall portions 24 and 25 are integrated with each side wall portion 28 of the positioning wall 27, respectively. The collision wall portions 24 and 25 are arranged on each side wall portion 28. That is, the collision wall portions 24 and 25 are arranged above the stacking table 26. The upper end surfaces of the collision wall portions 24 and 25 are chamfered so as to be substantially horizontal and are flush with each other. The height position of the upper end surfaces of the collision wall portions 24 and 25 is slightly lower than the height position of the transport surface 22a of the transport portion 22 and the carry-out side end portion of the transport surface 23a of the transport portion 23.

The collision wall portion 24 is located on an extension line of the transport portion 22 from the transport portion 22 toward the stacking portion 21, and is arranged between the stacking base 26 and the transport surface 23a of the transport portion 23. The extension line of the transport unit 22 means a line on which the transport path formed by the transport surface 22a of the transport unit 22 is extended in a horizontal view. The collision wall portion 24 collides the side edges of the positive electrode 11 with a separator conveyed by the conveying portion 22, and drops the positive electrode 11 with a separator onto the laminated portion 21. The collision wall portion 25 is located on an extension line of the transport portion 23 from the transport portion 23 toward the stacking portion 21 so as to face the collision wall portion 24, and is between the stacking table 26 and the transport surface 22a of the transport portion 22. Is located in. The extension line of the transport unit 23 means a line on which the transport path formed by the transport surface 23a of the transport unit 23 is extended in a horizontal view. The collision wall portion 25 collides the side edges of the negative electrode 9 conveyed by the conveying portion 23, and causes the negative electrode 9 to fall onto the laminated portion 21.

The collision surface of the collision wall portion 24 (inner surface where the side edges of the positive electrode 11 with a separator collide) 24a and the collision surface of the collision wall portion 25 (inner surface where the side edges of the negative electrode 9 collide) 25a are the collision wall portion 24, The tapered portions 33 and 34 are provided so as to widen the width between the collision wall portions 24 and 25 toward the upper end surface of the 25, respectively.

The laminated portion 21 and the collision wall portions 24 and 25 are made of, for example, a resin material. The tapered portion 33 of the collision surface 24a of the collision wall portion 24 and the tapered portion 34 of the collision surface 25a of the collision wall portion 25 are cushioned for cushioning the impact when the side edges of the positive electrode 11 with a separator and the negative electrode 9 collide with each other. Each of the materials 35 is attached. In FIGS. 3 and 4, the cushioning material 35 is omitted for convenience. As the cushioning material 35, for example, rubber or sponge is used. Although not shown in particular, a cushioning material for cushioning the impact when the bottom edges of the positive electrode 11 with a separator and the negative electrode 9 collide is also provided on the inner bottom surface of the bottom wall portion 29 of the positioning wall 27 in the laminated portion 21. It may be attached.

When the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated by using the laminating device 20 as described above, the positive electrode 11 with a separator is conveyed to the conveying unit 22 while the conveying units 22 and 23 are driven. The negative electrode 9 is sequentially placed on the surface 22a at a predetermined interval, and the negative electrode 9 is sequentially placed on the transport surface 23a of the transport unit 23 at a predetermined interval.

At this time, the separator 10 is provided with a separator so that the longitudinal direction of the separator 10 coincides with the transport direction of the positive electrode 11 with a separator, and the positive electrode tab 8b protrudes to the back side with respect to the laminated portion 21 and is located on the upstream side of the transport portion 22. The positive electrode 11 is placed on the transport unit 22 (see FIG. 5). Further, the negative electrode 9 is set so that the longitudinal direction of the negative electrode main body 9a coincides with the transport direction of the negative electrode 9 and the negative electrode tab 9b protrudes to the back side with respect to the laminated portion 21 and is located on the upstream side of the transport portion 23. It is placed on the transport unit 23 (see FIG. 5).

Then, the transfer unit 22 sequentially conveys the positive electrode 11 with a separator toward the laminated portion 21 at a predetermined interval, and the transport unit 23 sequentially conveys the negative electrode 9 toward the laminated portion 21 at a predetermined interval.

Then, the positive electrode 11 with a separator carried out from the transport portion 22 passes directly above the laminated portion 21 and collides with the tapered portion 33 of the collision wall portion 24 in a state of being slightly dropped by gravity toward the laminated portion 21. It falls and is laminated on the laminated portion 21. At this time, both side edges of the positive electrode 11 with a separator are positioned in contact with each side wall 28 of the positioning wall 27, and the bottom edge of the positive electrode 11 with a separator abuts against the bottom wall 29 of the positioning wall 27 and is positioned. .. Further, the negative electrode 9 carried out from the transport portion 23 passes directly above the laminated portion 21, collides with the tapered portion 34 of the collision wall portion 25 in a state of being slightly dropped by gravity, and falls toward the laminated portion 21. , Laminated on the laminated portion 21. At this time, both side edges of the negative electrode 9 are in contact with each side wall portion 28 of the positioning wall 27 for positioning, and the bottom edge of the negative electrode 9 abuts on the bottom wall portion 29 of the positioning wall 27 for positioning. As a result, a laminated body in which the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated can be obtained.

When the positive electrode 11 with a separator collides with the collision wall portion 24 and falls, and when the negative electrode 9 collides with the collision wall portion 25 and falls, the positive electrode 11 with a separator and the negative electrode 9 overlap (wrap) in the stacking direction. It is possible to move like this. Then, the transport speed and the transport interval of the positive electrode 11 and the negative electrode 9 with the separator are determined by the transport units 22 and 23 according to the lap state between the positive electrode 11 with the separator and the negative electrode 9. Therefore, the supply interval of the positive electrode 11 and the negative electrode 9 with the separator is shortened as compared with the case where the positive electrode 11 with the separator and the negative electrode 9 slide in the same plane in order and move.

The positive electrode 11 and the negative electrode 9 with a separator are laminated on the laminated portion 21 with the positive electrode tab 8b and the negative electrode tab 9b facing upward, respectively. At this time, the positive electrode tab 8b is located on the transport portion 22 side, and the negative electrode tab 9b is located on the transport portion 23 side.

Here, as a comparative example, FIGS. 7 and 8 show a laminating device to which a transport portion for transporting electrodes is added so as to give an initial velocity in the prior art. FIG. 7 is a side view (including a partial cross section) showing a laminating device as a comparative example. FIG. 8 is a front view of the laminating apparatus shown in FIG. 7.

In each figure, the stacking device 100 includes a transport unit 101, a stacking unit 102 arranged below the transport unit 101, and a sliding unit 103 arranged between the transport unit 101 and the stacking unit 102. There is. The transport unit 101 transports the positive electrode 11 with a separator and the negative electrode 9 along the horizontal direction.

The laminating portion 102 has a laminating table 104 on which the positive electrode 11 with a separator and the negative electrode 9 are laminated, and a positioning wall 105 standing on the upper surface of the laminating table 104 to position the positive electrode 11 with a separator and the negative electrode 9. There is. The positioning wall 105 has a pair of side wall portions 106 that come into contact with both side edges of the positive electrode 11 with a separator and the negative electrode 9 to align the positions of both side edges of the positive electrode 11 with a separator and the negative electrode 9, and the bottom of the positive electrode 11 and the negative electrode 9 with a separator. It has a positive electrode 11 with a separator and a bottom wall portion 107 that aligns the positions of the bottom edges of the negative electrode 9 in contact with the edges. The stacking table 104 is inclined at a predetermined angle with respect to the horizontal direction so that the bottom wall portion 107 is located on the lower side.

The sliding portion 103 is erected on both sides of the base portion 103a having a sliding surface and the base portion 103a, and comes into contact with both side edges of the positive electrode 11 with a separator and the negative electrode 9 to guide the positive electrode 11 with a separator and the negative electrode 9 in the width direction. It has a guide wall portion 103b for performing the above. The sliding portion 103 slides the positive electrode 11 with a separator and the negative electrode 9 conveyed by the conveying portion 101 toward the laminated portion 102, so that the positive electrode 11 with a separator and the negative electrode 9 are dropped onto the laminated portion 102.

When the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated on the laminated portion 102 by using such a laminating device 100, the positive electrode 11 with a separator and the negative electrode 9 are alternately conveyed by the conveying portion 101 at predetermined intervals. .. Then, the positive electrode 11 with a separator and the negative electrode 9 conveyed by the conveying portion 101 slide on the sliding portion 103, fall onto the laminating portion 102, and are laminated on the laminating base 104 of the laminating portion 102.

However, in the method of laminating the positive electrode 11 and the negative electrode 9 with a separator using the laminating device 100, in order to improve the production efficiency, the laminating speed of the positive electrode 11 and the negative electrode 9 with a separator is increased to obtain a desired laminated body. Attempt, the following problems exist.

That is, since the transport portion 101, the sliding portion 103, and the laminated portion 102 are arranged along the vertical direction (height direction), the height distance from the transport portion 101 to the bottom wall portion 107 of the laminated portion 102 becomes long. .. Therefore, the transport speed of the positive electrode 11 with the separator and the negative electrode 9 in the transport portion 101 is also added, and the falling speed of the positive electrode 11 with the separator and the negative electrode 9 in the laminated portion 102 has to be increased. In order to reduce the falling speed of the positive electrode 11 and the negative electrode 9 with a separator, it is conceivable to reduce the transport speed of the positive electrode 11 and the negative electrode 9 with a separator by the transport unit 101. However, simply reducing the transport speed of the positive electrode 11 with a separator and the negative electrode 9 makes it impossible to secure a desired laminating speed (for example, 2 sheets / sec or more) in the laminating portion 102. In order to reduce the transport speed of the positive electrode 11 with a separator and the negative electrode 9 while ensuring a desired stacking speed, it is conceivable to shorten the transport interval between the positive electrode 11 with a separator and the negative electrode 9. However, it is not possible to overlap a part of the positive electrode 11 with a separator and the negative electrode 9 in the transport portion 101 and the sliding portion 103. Further, when different sheet-like bodies such as the positive electrode 11 with a separator and the negative electrode 9 are slid on the sliding portion 103, the sliding speeds of the two may be different due to the different frictional states of the two. Therefore, even when compared with the case where a single sheet-like body is slid, it is necessary to further increase the distance between the two sheet-like bodies in order not to interfere with each other. Therefore, there is a limit to shortening the transport interval between the positive electrode 11 with a separator and the negative electrode 9. Therefore, in the comparative example, it is difficult to improve the laminating speed without changing the falling speeds of the positive electrode 11 with the separator and the negative electrode 9 in the laminating portion 102.

Further, in the laminated portion 102, the positive electrode 11 with a separator and the negative electrode 9 that have fallen bounce due to collision with the bottom wall portion 107 of the laminated portion 102. When the falling speed of the positive electrode 11 with a separator and the negative electrode 9 increases, the bounce of the positive electrode 11 and the negative electrode 9 with a separator increases, and the time until the positive electrode 11 and the negative electrode 9 with a separator completely stop and converge becomes long. Therefore, when the transport speed of the positive electrode 11 with a separator and the negative electrode 9 is increased in order to obtain a desired laminating speed, the time until the electrodes completely stop and converge in the laminating portion 102 (operation convergence time) is increased. The time until the next electrode is supplied to the laminated portion 102 and hits the bottom wall portion 107 (next electrode supply time) may be exceeded. In this case, for example, the next negative electrode 9 is supplied to the laminated portion 102 before the positive electrode 11 with a separator previously supplied to the laminated portion 102 converges, and the positive electrode 11 with a separator sandwiched between the negative electrodes 9 is the bottom wall. There is a risk of stopping without contacting the portion 107. As a result, the positive electrode 11 with a separator and the negative electrode 9 are misaligned. Therefore, in order to prevent such stacking deviation, the next negative electrode 9 cannot be supplied until the bounce of the positive electrode 11 with a separator converges, and the stacking speed of the positive electrode 11 with a separator and the negative electrode 9 is limited. Will be done.

Further, when the falling speed of the positive electrode 11 with the separator and the negative electrode 9 is increased in the laminated portion 102, the collision energy when the positive electrode 11 with the separator and the negative electrode 9 hit the bottom wall portion 107 of the laminated portion 102 becomes high. Generally, the positive electrode 8 and the negative electrode 9 are manufactured by cutting out individual electrodes from a strip-shaped electrode material. Therefore, on the edges of the positive electrode 8 and the negative electrode 9, there are places where the active material particles are easily peeled off at the time of cutting. Therefore, when the collision energy becomes high, the number of active material particles exfoliated from the electrode increases and the number of foreign substances increases, which adversely affects the quality.

On the other hand, in the present embodiment, the positive electrode 11 with a separator which is horizontally conveyed by the conveying portion 22 collides with the collision wall portion 24 and falls to the laminated portion 21, and the negative electrode which is horizontally conveyed by the conveying portion 23. When the 9 collides with the collision wall portion 25 and falls on the laminated portion 21, the positive electrode 11 with a separator and the negative electrode 9 are sequentially laminated on the laminated portion 21. At this time, since the positive electrode 11 with a separator and the negative electrode 9 merge on the same path above the stacking table 26 of the stacking portion 21 and overlap in the stacking direction, the distance between the positive electrode 11 with a separator and the negative electrode 9 is shortened. However, the stacking speed of the positive electrode 11 with a separator and the negative electrode 9 can be improved.

Further, in the present embodiment, the positioning wall 27 has a bottom wall portion 29 that contacts the bottom edges of the positive electrode 11 with a separator and the negative electrode 9 and aligns the positions of the bottom edges of the positive electrode 11 with a separator and the negative electrode 9. 26 is inclined with respect to the horizontal direction so that the bottom wall portion 29 is located on the lower side. Therefore, when the positive electrode 11 with a separator and the negative electrode 9 are supplied to the laminated portion 21, the positive electrode 11 with a separator and the negative electrode 9 slide down along the stacking table 26, and the bottom edge of the positive electrode 11 with a separator and the negative electrode 9 is the bottom wall portion. It is positioned in contact with 29.

At this time, since the collision wall portions 24 and 25 and the side wall portions 28 of the positioning wall 27 are integrated, the height dimension from the mounting surface of the stacking table 26 to the collision wall portions 24 and 25 is suppressed, and the laminated portion is suppressed. The drop distance between the positive electrode 11 with a separator and the negative electrode 9 with respect to 21 can be shortened. In particular, since the transport units 22 and 23 are arranged so as to face each other, the drop height of either the positive electrode 11 with a separator or the negative electrode 9 is higher than in the case where a plurality of transport portions are arranged vertically. Nor. By shortening the falling distance between the positive electrode 11 with a separator and the negative electrode 9, the falling speed of the positive electrode 11 with a separator and the negative electrode 9 can be suppressed in the laminated portion 21. Further, since the positive electrode 11 with a separator collides with the collision wall portion 24 and then falls on the laminated portion 21, and the negative electrode 9 collides with the collision wall portion 25 and then falls on the laminated portion 21, the positive electrode 11 with a separator and the negative electrode 9 fall. Immediately after the collision, the initial falling speeds of the positive electrode 11 with the separator and the negative electrode 9 become almost zero. Therefore, the falling speed of the positive electrode 11 with a separator and the negative electrode 9 in the laminated portion 21 is further suppressed.

Since the falling speed of the positive electrode 11 with a separator and the negative electrode 9 is suppressed in the laminated portion 21 in this way, the bounce of the positive electrode 11 with a separator and the negative electrode 9 that have fallen on the laminated portion 21 is reduced. Therefore, since the operation convergence time of the positive electrode 11 with the separator and the negative electrode 9 is shortened, the electrode is stopped in a state where it sticks to the electrode supplied to the laminated portion 21 next and does not abut on the bottom wall portion 29 before the electrodes converge. The phenomenon is less likely to occur. This prevents the stacking speed of the positive electrode 11 with a separator and the negative electrode 9 from being limited. Further, since the falling speed of the positive electrode 11 with a separator and the negative electrode 9 is suppressed in the laminated portion 21, the collision energy when the positive electrode 11 with a separator and the negative electrode 9 hit the laminated portion 21 is reduced. As a result, damage given to the positive electrode 11 with a separator and the negative electrode 9 can be reduced.

Further, the conveying unit 22 conveys the positive electrode 11 with a separator in the horizontal direction toward the laminating portion 21, and the conveying unit 23 conveys the negative electrode 9 in the horizontal direction toward the laminating portion 21, whereby the laminating apparatus 100 described above. Unlike the case where the positive electrode 11 with a separator and the negative electrode 9 are sequentially conveyed toward the laminated portion 102 by the conveying portion 101 as described above, even if the conveying speed of the positive electrode 11 with a separator and the negative electrode 9 is reduced, the separator to the laminated portion 21 By shortening the supply interval between the positive electrode 11 and the negative electrode, a desired laminating speed can be secured in the laminating portion 21. When the transport speed of the separator-equipped positive electrode 11 is reduced, the bounce of the separator-equipped positive electrode 11 due to collision with the collision wall portion 24 is suppressed, so that the residence time of the separator-equipped positive electrode 11 at the collision wall portion 24 is reduced. When the transport speed of the negative electrode 9 is lowered, the bounce due to the collision of the negative electrode 9 with the collision wall portion 25 is suppressed, so that the residence time of the negative electrode 9 at the collision wall portion 25 is reduced.

Further, in the present embodiment, the collision wall portions 24 and 25 are arranged so as to face each other together with the transport portions 22 and 23. Therefore, the transport speed of the positive electrode 11 and the negative electrode 9 with a separator is increased, and even when a large bounce of the positive electrode 11 and the negative electrode 9 with a separator occurs due to the collision between the positive electrode 11 and the negative electrode 9 with a separator and the collision wall portions 24 and 25. The collision wall portions 24 and 25 facing each other prevent the positive electrode 11 with a separator and the negative electrode 9 from popping out.

Further, in the present embodiment, the collision wall portions 24 and 25 are integrated with the positioning wall 27. Therefore, the laminated portion 21 and the collision wall portions 24 and 25 can be integrally formed, and the number of parts of the laminating device 20 is reduced. As a result, the cost can be reduced.

Further, in the present embodiment, the collision surface 24a of the collision wall portion 24 and the collision surface 25a of the collision wall portion 25 widen the width between the collision wall portions 24 and 25 toward the upper end surfaces of the collision wall portions 24 and 25. It has such tapered portions 33 and 34, respectively. As a result, the positive electrode 11 with a separator that collided with the collision wall portion 24 and the negative electrode 9 that collided with the collision wall portion 25 are smoothly supplied to the laminated portion 21.

Further, in the present embodiment, the cushioning material 35 is attached to the collision surface 24a of the collision wall portion 24 and the collision surface 25a of the collision wall portion 25, respectively. Therefore, the impact when the positive electrode 11 with a separator collides with the collision wall portion 24 is alleviated, and the impact when the negative electrode 9 collides with the collision wall portion 25 is alleviated. The damage done can be further reduced.

FIG. 9 is a front view showing the laminating device according to the second embodiment of the present invention, and is a view corresponding to FIG. 10 is a side sectional view of the laminating apparatus shown in FIG. 9, and is a view corresponding to FIG.

In each figure, the stacking device 20 of the present embodiment includes a stacking portion 21, transport portions 22, 23, and collision wall portions 24, 25, as in the first embodiment. The height position of the laminated portion 21 is higher than the height position of the laminated portion 21 in the first embodiment. That is, the height position of the laminated portion 21 is closer to the conveying portions 22 and 23 than the height position of the laminated portion 21 in the first embodiment. Therefore, the height dimension of the laminated portion 21 is smaller than the height dimension of the laminated portion 21 in the first embodiment. In the present embodiment, when the positive electrode 11 with a separator and the negative electrode 9 are laminated on the laminated portion 21, a part of the positive electrode tab 8b and the negative electrode tab 9b is configured to protrude from the mounting surface of the stacking table 26. A chamfer 26a is formed at the tip end portion (upper end portion) of the mounting surface of the stacking table 26 in the stacking portion 21.

Further, the laminating device 20 includes two air blowers 40 that blow air onto the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 that have already been laminated on the laminating portion 21. These air blows 40 are arranged above the laminated portion 21. The air blow 40 blows air from above onto the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9. The air blow 40 is controlled by a controller (not shown).

When the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated by using such a laminating device 20, the positive electrode 11 with a separator is directed toward the laminating portion 21 by the transport unit 22 as in the first embodiment. The negative electrode 9 is conveyed toward the laminated portion 21 by the conveying portion 23. Then, the positive electrode 11 with a separator carried out from the transport portion 22 collides with the collision wall portion 24, falls toward the laminated portion 21, and is laminated on the laminated portion 21. The negative electrode 9 carried out from the transport portion 23 collides with the collision wall portion 25, falls toward the laminated portion 21, and is laminated on the laminated portion 21.

Here, when the number of layers of the positive electrode 11 with a separator and the negative electrode 9 laminated on the laminated portion 21 increases, when the positive electrode 11 with a separator carried out from the transport portion 22 collides with the collision wall portion 24, the positive electrode with a separator is said. When the 11 interferes with the positive electrode tab 8b of the positive electrode 11 with a separator already laminated on the laminated portion 21 and the negative electrode tab 9b of the negative electrode 9, or when the negative electrode 9 carried out from the transport portion 23 collides with the collision wall portion 25, the said. The negative electrode 9 may interfere with the positive electrode tab 8b of the positive electrode 11 with a separator already laminated on the laminated portion 21 and the negative electrode tab 9b of the negative electrode 9.

Therefore, when the number of laminated positive electrodes 11 with separators and negative electrodes 9 laminated on the laminated section 21 exceeds a predetermined number, the positive electrodes 11 with separators carried out from the transport section 22 and the negative electrodes 9 carried out from the transport section 23. Immediately before passing directly above the laminated portion 21, air is blown onto the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21 by the air blow 40. Then, the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21 protrude from the laminating base 26 (described above), and therefore, as shown in FIG. 11, they are laminated on the laminating portion 21. The positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 are bent downward. Note that FIG. 11 does not show the laminated portion 21 for simplification, and shows only one negative electrode 9 as a laminated body.

In the present embodiment, since the height position of the laminated portion 21 is brought closer to the height position of the conveying portions 22 and 23, the drop distance of the positive electrode 11 with the separator and the negative electrode 9 with respect to the laminated portion 21 is shortened. Further, when the positive electrode 11 with a separator and the negative electrode 9 conveyed by the conveying portions 22 and 23 collide with the collision wall portions 24 and 25, respectively, the positive electrode tab 8b and the negative electrode 9 of the positive electrode 11 with a separator already laminated on the laminated portion 21 By blowing air onto the negative electrode tab 9b of the above and bending the positive electrode tab 8b and the negative electrode tab 9b downward, the positive electrode 11 and the negative electrode 9 with a separator transported by the transport portions 22 and 23 have a separator already laminated on the laminated portion 21. Interference with the positive electrode tab 8b of the positive electrode 11 and the negative electrode tab 9b of the negative electrode 9 is prevented. As a result, even if the drop distance of the positive electrode 11 with a separator and the negative electrode 9 with respect to the laminated portion 21 is shortened, damage to the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21 is prevented. can do. Since the falling distance of the positive electrode 11 with the separator and the negative electrode 9 with respect to the laminated portion 21 is shortened in this way, the falling speed of the positive electrode 11 with the separator and the negative electrode 9 can be further suppressed in the laminated portion 21.

FIG. 12 is a front view showing a modified example of the laminating apparatus according to the second embodiment of the present invention, and is a view corresponding to FIG. FIG. 13 is a side sectional view of the laminating apparatus shown in FIG. 12, and is a view corresponding to FIG.

In each figure, the laminating device 20 of this modified example includes a cover 45 and a driving unit 46 instead of the air blow 40 in the second embodiment. The cover 45 is a member that is arranged above the laminated portion 21 and covers the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9.

The drive unit 46 moves the cover 45 between a protective position that covers the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 that have already been laminated on the laminated portion 21 and a retracted position that retracts the laminated portion 21. .. The drive unit 46 may move the cover 45 only in the horizontal direction, or may move the cover 45 in the horizontal direction and the vertical direction. The drive unit 46 is controlled by a controller (not shown).

In such a laminating apparatus 20, when the number of laminated positive electrodes 11 and 9 with a separator laminated on the laminating portion 21 exceeds a predetermined number, the positive electrode 11 with a separator and the conveying portion 23 carried out from the conveying unit 22 are carried out. Immediately before the negative electrode 9 carried out from the above passes directly above the laminated portion 21, the drive unit 46 moves the cover 45 from the retracted position to the protected position. As a result, as shown in FIGS. 14A and 15A, the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21 are covered with the cover 45. Note that in FIGS. 14 and 15, the laminated portion 21 is not shown for simplification. Further, in FIG. 14, only one negative electrode 9 is shown as a laminated body.

After the positive electrode 11 with the separator and the negative electrode 9 pass directly above the laminated portion 21, the cover 45 is moved from the protective position to the retracted position by the drive unit 46 as shown in FIGS. 14 (b) and 15 (b). Let me. Then, the positive electrode 11 with a separator carried out from the transport portion 22 collides with the collision wall portion 24, falls toward the laminated portion 21, and is laminated on the laminated portion 21. The negative electrode 9 carried out from the transport portion 23 collides with the collision wall portion 25, falls toward the laminated portion 21, and is laminated on the laminated portion 21.

In this modification, when the positive electrode 11 with a separator and the negative electrode 9 conveyed by the conveying portions 22 and 23 collide with the collision wall portions 24 and 25, respectively, the positive electrode tab of the positive electrode 11 with a separator already laminated on the laminated portion 21. By covering the negative electrode tabs 9b of 8b and the negative electrode 9 with the cover 45, the positive electrode 11 with a separator and the negative electrode 9 conveyed by the transport portions 22 and 23 are already laminated on the laminated portion 21, and the positive electrode tab 8b and the negative electrode of the positive electrode 11 with a separator are laminated. Interference with the negative electrode tab 9b of 9 is prevented. As a result, similarly to the second embodiment, the positive electrode 11 with a separator attached to the laminated portion 21 is prevented from being damaged, such as damage to the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21. And the falling distance of the negative electrode 9 can be shortened, and the falling speed of the positive electrode 11 with a separator and the negative electrode 9 can be further suppressed in the laminated portion 21.

FIG. 17 is a front view showing a laminating device according to a modified example. FIG. 18 is an enlarged view showing a configuration in the vicinity of the collision wall portion of FIG. FIG. 19 is a side sectional view of the laminating apparatus shown in FIG. 12, and is a view corresponding to FIG.

In each figure, in the laminating device 20 of this modified example, a suction portion is formed on the collision wall portion in the first embodiment. Specifically, the collision wall portion 25 is formed with a suction portion 61 that sucks the positive electrode 11 with a separator that is conveyed by the transport portion 22 and collides with the collision wall portion 24. The collision wall portion 24 is formed with a suction portion 62 that attracts the negative electrode 9 that is conveyed by the transport portion 23 and collides with the collision wall portion 25. The suction portion 61 is configured by forming a hole that penetrates the collision wall portion 25 in a predetermined direction. The suction portion 62 is configured by forming a hole that penetrates the collision wall portion 24 in a predetermined direction. The outer ends of the suction portions 61 and 62 are connected to suction means such as a vacuum pump (not shown).

As shown in FIG. 18, the suction portion 61 is inclined obliquely upward with respect to the inside of the laminated portion 21. Therefore, the suction unit 61 can form an air flow that goes diagonally downward. Of the positive electrode 11 with a separator at the time of collision with the collision wall portion 24, the region on the collision wall portion 25 side (that is, the region on the rear end side in the traveling direction) is sucked. For example, the center line CL1 between the collision wall portions 24 and 25 is set, the center line CL2 between the center line CL1 and the collision surface 25a is set, and the center line CL4 of the suction portion 61 is set. Further, the position of the upper end of the opening between the collision wall portion 25 and the collision wall portion 24 is defined as the opening position ST. In this case, the center line CL4 of the suction portion 61 intersects the opening position ST at a position closer to the collision wall portion 25 than the center line CL1. As a result, at least when the positive electrode 11 with a separator reaches the opening position ST, the suction unit 61 can suck the region of the positive electrode 11 with a separator on the collision wall portion 25 side. Further, the center line CL4 of the suction portion 61 may intersect the opening position ST at a position closer to the collision wall portion 25 than the center line CL2. As a result, the suction portion 61 can further suck the vicinity of the end portion of the positive electrode 11 with a separator on the collision wall portion 25 side.

The suction portion 61 is formed at a position on the upper end side of the collision wall portion 25. The suction portion 61 may be arranged above the laminated body and below the taper portion 34. Further, the suction portion 61 may be arranged below the position where the positive electrode 11 with a separator collides with the collision wall portion 24. Therefore, after the positive electrode 11 with a separator is sucked and slightly lowered downward immediately after the collision with the collision wall portion 24, the suction force can be prevented from acting on the positive electrode 11 with a separator. As a result, it is possible to suppress the influence of negative pressure on the tabs and the like of the electrodes after stacking.

The suction portion 62 is inclined obliquely upward with respect to the inside of the laminated portion 21. Therefore, the suction unit 62 can form an air flow that goes diagonally downward. The suction unit 62 sucks the region on the collision wall portion 24 side (that is, the region on the rear end side in the traveling direction) of the negative electrode 9 at the time of collision with the collision wall portion 25. For example, the center line CL3 between the center line CL1 and the collision surface 24a is set, and the center line CL5 of the suction unit 62 is set. In this case, the center line CL5 of the suction portion 62 intersects the opening position ST at a position closer to the collision wall portion 24 than the center line CL1. As a result, at least when the negative electrode 9 reaches the opening position ST, the suction unit 62 can suck the region of the negative electrode 9 on the collision wall portion 24 side. Further, the center line CL5 of the suction portion 62 may intersect the opening position ST at a position closer to the collision wall portion 24 than the center line CL3. As a result, the suction portion 62 can further attract the vicinity of the end portion of the negative electrode 9 on the collision wall portion 24 side.

The suction portion 62 is formed at a position on the upper end side of the collision wall portion 24. The suction portion 62 may be arranged above the laminated body and below the taper portion 33. Further, the suction portion 62 may be arranged below the position where the negative electrode 9 collides with the collision wall portion 25. Therefore, after the negative electrode 9 is sucked immediately after the collision with the collision wall portion 25 and slightly lowered downward, the suction force can be prevented from acting on the negative electrode 9. As a result, it is possible to suppress the influence of negative pressure on the tabs and the like of the electrodes after stacking.

As shown in FIG. 19, the suction portion 61 has a shape extending in the width direction of the transport portion 22. As a result, the suction force of the suction portion 61 acting on the positive electrode 11 with a separator can be dispersed. The suction unit 61 may be arranged on the center side of the positive electrode 11 with a separator when being supplied from the transport unit 22 in the width direction of the transport unit 22. For example, when the center line CL7 in the width direction of the positive electrode 11 with a separator immediately before falling from the transport unit 22 is set, the suction unit 61 is arranged at a position closer to the center line CL7 in the collision wall portion 25. For example, the center line in the width direction of the suction portion 61 may be arranged at a position closer to the center line CL7 than the end portion of the positive electrode 11 with a separator. The opening of the suction portion 61 has a rectangular shape extending in the width direction. However, the shape of the opening of the suction portion 61 is not particularly limited, and may be circular, or may be configured such that a plurality of openings are lined up in the width direction. The suction unit 62 also has the same configuration as the suction unit 61. That is, the suction unit 62 may be arranged on the center side of the negative electrode 9 when it is supplied from the transport unit 23 in the width direction of the transport unit 23.

As described above, the collision wall portion 25 is formed with a suction portion 61 that sucks the positive electrode 11 with a separator that is conveyed by the transport portion 22 and collides with the collision wall portion 24. The collision wall portion 24 is formed with a suction portion 62 that attracts the negative electrode 9 that is conveyed by the transport portion 23 and collides with the collision wall portion 25. In this case, when the positive electrode 11 with a separator is supplied from the transport unit 22, the suction unit 61 sucks the positive electrode 11 with a separator from the collision wall portion 25 side, so that the positive electrode 11 with a separator is on the collision wall portion 25 side. Area can be lowered downwards. As a result, the movement path of the negative electrode 9 transported from the transport unit 23 can be secured at an early stage. Further, when the negative electrode 9 is supplied from the transport unit 23, the suction unit 62 sucks the negative electrode 9 from the collision wall portion 24 side, so that the region of the negative electrode 9 on the collision wall portion 24 side can be lowered downward. .. As a result, the movement path of the positive electrode 11 with a separator transported from the transport unit 22 can be secured at an early stage. As described above, it is possible to shorten the time interval when supplying each electrode from each transport unit.

The suction portion 61 is inclined obliquely upward, and attracts the region on the collision wall portion 25 side of the positive electrode 11 with a separator at the time of collision with the collision wall portion 24. The suction portion 62 is inclined obliquely upward, and the region on the collision wall portion 24 side of the negative electrode 9 at the time of collision with the collision wall portion 25 may be sucked. In this case, the suction portion 61 can lower the region of the positive electrode 11 with a separator on the collision wall portion 25 side earlier. Further, the suction portion 62 can lower the region of the negative electrode 9 on the collision wall portion 24 side earlier.

The suction unit 61 and the suction unit 62 may alternately perform suction according to the supply of the positive electrode 11 with a separator from the transport unit 22 and the supply of the negative electrode 9 from the transport unit 23. In this case, when the positive electrode 11 with a separator is supplied, the posture of the positive electrode 11 with a separator can be controlled more appropriately by sucking only with the suction unit 61. That is, the posture of the positive electrode 11 with a separator can be brought closer to horizontal by sucking only with the suction unit 61. Further, when the negative electrode 9 is supplied, the posture of the negative electrode 9 can be controlled more appropriately by sucking only the suction unit 62. That is, the posture of the negative electrode 9 can be brought closer to horizontal by suctioning only with the suction unit 62. The suction units 61 and 62 may continuously continue suction regardless of the supply status of each electrode. In this case, the suction units 61 and 62 can be easily controlled.

The suction unit 61 is arranged on the center side of the positive electrode 11 with a separator when being supplied from the transport unit 22 in the width direction of the transport unit 22. The suction unit 62 is arranged on the center side of the negative electrode 9 when it is supplied from the transport unit 23 in the width direction of the transport unit 23. In this case, since the suction unit 61 can suck the vicinity of the center of the positive electrode 11 with a separator supplied from the transport unit 22 in the width direction, the posture of the positive electrode 11 with a separator can be controlled more appropriately. Since the suction unit 62 can suck the vicinity of the center of the negative electrode 9 supplied from the transport unit 23 in the width direction, the posture of the negative electrode 9 can be controlled more appropriately.

In the description of the modified examples of FIGS. 17 to 19 described above, an example in which a suction unit is added to the laminating device of the embodiment shown in FIG. 4 has been described, but a suction unit is added to the laminating device according to other modified examples. May be added.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the position of the laminated portion 21 is fixed, but the present invention is not particularly limited to that form, and the laminated portion 21 may be movable.

FIG. 16 is a front view showing a laminating device 20 provided with a movable laminating portion 21. In FIG. 16, the stacking device 20 includes a guide rail 50 extending in the front-rear direction (front and back directions in the drawing), a support portion 51 that supports the stacking portion 21 so as to be movable in the front-rear direction along the guide rail 50, and the support portion 51. Is further provided with a drive unit 52 that moves the vehicle along the guide rail 50.

In such a laminating device 20, when the laminated body in which the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated has a predetermined height dimension, it is necessary to take out the laminated body from the laminating portion 21. Therefore, when the laminated body is taken out from the laminated portion 21, the laminated portion 21 is moved to a predetermined position on the front side (front side) along the guide rail 50 by the driving unit 52. Further, as the lamination of the positive electrode 11 with a separator and the negative electrode 9 progresses in the laminated portion 21, the height dimension of the laminated body increases. Therefore, even if the height dimension of the laminated body is increased, the laminated portion 21 is moved to the back side along the guide rail 50 by the drive unit 52 so that the laminated height positions of the positive electrode 11 with the separator and the negative electrode 9 are constant. Move it to the rear side) by a predetermined distance.

For example, as shown in FIG. 20, in a plan view, the transport portions 22 and 23 may be inclined by a predetermined angle with respect to the laminated portion 21. In the example shown in FIG. 20, the transport portions 22 and 23 are inclined so as to move downward from the stacking table 26 as the distance from the stacking table 26 increases. In a plan view, the collision surfaces 24a and 25a of the collision wall portions 24 and 25 may be substantially parallel to the end faces of the transport portions 22 and 23 on the supply side.

For example, as shown in FIG. 21, the transport portions 22 and 23 may extend obliquely upward from the laminated portion 21 in a front view. The end portions of the transport portions 22 and 23 on the supply side are arranged above the upper end portions of the collision wall portions 24 and 25. As a result, the transport units 22 and 23 are supplied to the laminated portion 21 from diagonally above, so that the air transport time is shortened. Thereby, the laminating time can be shortened. Even if the transport portions 22 and 23 are tilted with respect to the horizontal direction as in the form of FIG. 21, the electrode has a larger speed component in the horizontal direction than the speed component in the vertical direction because the tilt angle is shallow. Therefore, even in such a situation, the electrodes are "conveyed in the horizontal direction".

Next, the arrangement of the tabs of the electrodes on the transport portion will be described with reference to FIGS. 22 to 26. FIG. 22 is a front view showing a laminating apparatus used in the electrode laminating method according to the embodiment of the present invention. FIG. 23 is a plan view of the stacking device shown in FIG. 22, and FIG. 24 is a side sectional view of the stacking device shown in FIG.

In each figure, the laminating device 20 of the present embodiment is a device for alternately laminating a positive electrode 11 with a separator and a negative electrode 9 at high speed. The laminating device 20 includes a laminating portion 21 for laminating a positive electrode 11 with a separator and a negative electrode 9, and a positive electrode conveying portion 22 and a negative electrode conveying portion 23 arranged so as to face each other with the laminated portion 21 interposed therebetween.

The laminated section 21 is arranged adjacent to the positive electrode transport section 22 and the negative electrode transport section 23 and at a position lower than the upper surfaces of the positive electrode transport section 22 and the negative electrode transport section 23. The laminating portion 21 has a laminating table 26 on which the positive electrode 11 with a separator and the negative electrode 9 are placed, and a positioning wall 27 standing on the laminating table 26 for positioning the positive electrode 11 with a separator and the negative electrode 9. .. The stacking table 26 is inclined at a predetermined angle with respect to the horizontal direction so that the bottom wall portion 29 is located on the lower side.

The positioning wall 27 has a pair of side wall portions 28 that come into contact with both side edges of the positive electrode 11 with a separator and the negative electrode 9 to align the positions of both edges of the positive electrode 11 with a separator and the negative electrode 9, and the bottom of the positive electrode 11 and the negative electrode 9 with a separator. It has a positive electrode 11 with a separator and a bottom wall portion 29 that aligns the positions of the bottom edges of the negative electrode 9 in contact with the edges. The bottom edge of the positive electrode 11 with a separator is the edge of the positive electrode 11 with a separator opposite to the positive electrode tab 8b. The bottom edge of the negative electrode 9 is the edge of the negative electrode 9 opposite to the negative electrode tab 9b.

The positive electrode transport section 22 transports the positive electrode 11 with a separator in the horizontal direction toward the laminated section 21. The upper surface of the positive electrode transport portion 22 forms a transport surface 22a on which the positive electrode 11 with a separator is placed. The negative electrode transport portion 23 is arranged so as to face the positive electrode transport portion 22 with the laminated portion 21 interposed therebetween, and transports the negative electrode 9 in the horizontal direction toward the laminated portion 21. The upper surface of the negative electrode transport portion 23 forms a transport surface 23a on which the negative electrode 9 is placed. The horizontal direction referred to here includes not only a completely horizontal direction but also a direction slightly inclined with respect to the horizontal direction. The positive electrode transport unit 22 and the negative electrode transport unit 23 are belt conveyors. The positive electrode transport unit 22 and the negative electrode transport unit 23 have a belt 32 that is hung on the drive pulley 30 and the driven pulley 31. The drive pulley 30 is rotationally driven by a motor (not shown). The positive electrode transport unit 22 and the negative electrode transport unit 23 are not particularly limited to the belt conveyor, and may be a roller conveyor or the like.

When the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated on the laminated section 21, the negative electrode 9 is first placed on the negative electrode transport section 23 at predetermined intervals, and the positive electrode 11 with a separator is placed on the positive electrode transport section 22. The electrodes are sequentially placed on the electrodes at predetermined intervals (supply process).

At this time, one side of the negative electrode body 9a of the negative electrode 9 which is the base end of the negative electrode tab 9b is parallel to the transport direction of the negative electrode transport portion 23, and the negative electrode tab 9b is on the back side (rear side) with respect to the laminated portion 21. The negative electrode 9 is placed on the negative electrode transport portion 23 so as to project to the negative electrode and the negative electrode tab 9b is located on the upstream side of the negative electrode transport portion 23 in the transport direction (see FIG. 23). One side of the positive electrode main body 8a of the positive electrode 11 with a separator, which is the base end of the positive electrode tab 8b, is parallel to the transport direction of the positive electrode transport portion 22, and the positive electrode tab 8b is on the back side (negative electrode tab 9b) with respect to the laminated portion 21. The positive electrode 11 with a separator is placed on the positive electrode transport unit 22 so that the positive electrode tab 8b projects in the same direction as the projecting direction and is located on the upstream side of the positive electrode transport unit 22 in the transport direction (see FIG. 23). The back side of the laminated portion 21 is a direction perpendicular to the transport direction of the negative electrode 9 and the positive electrode 11 with a separator.

With the negative electrode 9 mounted on the negative electrode transport section 23 and the positive electrode 11 with a separator mounted on the positive electrode transport section 22, the negative electrode 9 and the positive electrode 11 with a separator are placed downstream in the transport direction (laminated section 21). Transport toward the side) (transport process). The transfer of the negative electrode 9 and the transfer of the positive electrode 11 with a separator are carried out alternately.

Then, the negative electrode 9 is dropped from one end of the transport surface 23a and laminated on the laminated portion 21, and the positive electrode 11 with a separator is dropped from one end of the transport surface 22a and laminated on the laminated portion 21 (lamination step).

At this time, both side edges of the negative electrode 9 are in contact with each side wall portion 28 of the positioning wall 27 for positioning, and the bottom edge of the negative electrode 9 abuts on the bottom wall portion 29 of the positioning wall 27 for positioning. Both side edges of the separator-equipped positive electrode 11 are positioned in contact with each side wall 28 of the positioning wall 27, and the bottom edge of the separator-equipped positive electrode 11 abuts against the bottom wall 29 of the positioning wall 27 for positioning. As a result, a laminated body in which the negative electrode 9 and the positive electrode 11 with a separator are alternately laminated can be obtained.

The negative electrode 9 and the positive electrode 11 with a separator are laminated on the laminated portion 21 with the negative electrode tab 9b and the positive electrode tab 8b facing upward, respectively. At this time, the negative electrode tab 9b is located on the negative electrode transport portion 23 side, and the positive electrode tab 8b is located on the positive electrode transport portion 22 side.

FIG. 25 is a schematic plan view showing a method of supplying electrodes to the laminated portion in the electrode laminating method as a comparative example. In this method, the negative electrode 9 is placed on the negative electrode transport portion 23 so that the negative electrode tab 9b projects to the back side (rear side) with respect to the laminated portion 21 and is located on the downstream side in the transport direction of the negative electrode transport portion 23. At the same time, the positive electrode 11 with a separator is placed on the positive electrode transport portion 22 so that the positive electrode tab 8b protrudes to the back side with respect to the laminated portion 21 and is located on the downstream side in the transport direction of the positive electrode transport portion 22. Although the laminated section 21, the positive electrode transport section 22, and the negative electrode transport section 23 are omitted in FIG. 25, the transport direction of the positive electrode 11 with a separator by the positive electrode transport section 22 and the transport direction of the negative electrode 9 by the negative electrode transport section 23 are , The direction is opposite to that of the above embodiment.

However, in such a method, the following problems occur. That is, the negative electrode 9 and the positive electrode 11 with a separator may be affected by, for example, the transport speed, fall on the laminated body in the process of being formed in the laminated portion 21, and then slide and come into contact with each side wall portion 28. Further, even if the number of laminated negative electrodes 9 and the positive electrode 11 with a separator is increased on the laminated portion 21 and the drop of the negative electrode 9 and the positive electrode 11 with a separator when dropped is small, the same behavior is performed. In such a case, particularly when the positive electrode 11 with a separator and the negative electrode 9 are supplied to the laminated portion 21, the positive electrode tab 8b and the negative electrode of the positive electrode 11 with a separator in which the positive electrode 11 and the negative electrode 9 with a separator are already laminated on the laminated portion 21 It becomes easy to interfere with the negative electrode tab 9b of 9. Specifically, when the positive electrode 11 with a separator is carried out from the positive electrode transport portion 22, the positive electrode tab 8b of the positive electrode 11 with a separator is the negative electrode tab 9b of the negative electrode 9 and the positive electrode 11 with a separator already laminated on the laminated portion 21. It may sequentially interfere with the positive electrode tab 8b (see FIG. 25). Further, when the negative electrode 9 is carried out from the negative electrode transport portion 23, the negative electrode tab 9b of the negative electrode 9 sequentially interferes with the positive electrode tab 8b of the positive electrode 11 with a separator already laminated on the laminated portion 21 and the negative electrode tab 9b of the negative electrode 9. Sometimes.

In this case, the positive electrode 11 with a separator and the negative electrode 9 supplied to the laminated portion 21 interfere with both the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21. become. That is, the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21 interfere with the positive electrode 11 with a separator and the negative electrode 9 supplied to the laminated portion 21 twice. Since the strength of the positive electrode tab 8b and the negative electrode tab 9b is weak, when the positive electrode tab 8b of the laminated positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 interfere with each other twice, the positive electrode tab 8b and the negative electrode 9 Bending, breaking, damage, etc. of the negative electrode tab 9b are likely to occur.

On the other hand, in the present embodiment, the positive electrode tab 8b protrudes in a direction perpendicular to the transport direction of the positive electrode 11 with a separator by the positive electrode transport section 22, and the positive electrode tab 8b is located on the upstream side of the positive electrode transport section 22 in the transport direction. With the positive electrode 11 with a separator placed on the positive electrode transport section 22 as described above, the positive electrode 11 with a separator is transported toward the laminated section 21 by the positive electrode transport section 22. Further, the negative electrode 9 is placed on the negative electrode transport portion 23 so that the negative electrode tab 9b protrudes in the same direction as the protrusion direction of the positive electrode tab 8b and the negative electrode tab 9b is located on the upstream side of the negative electrode transport portion 23 in the transport direction. Then, the negative electrode 9 is conveyed toward the laminated portion 21 by the negative electrode conveying portion 23. Therefore, the number of layers of the positive electrode 11 and the negative electrode 9 with a separator is increased on the laminated portion 21, so that when the positive electrode 11 and the negative electrode 9 with a separator are supplied to the laminated portion 21, the positive electrode 11 and the negative electrode 9 with a separator are supplied. Even when the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 that have already been laminated on the laminated portion 21 are likely to interfere with each other, the number of interferences can be minimized.

Specifically, when the positive electrode 11 with a separator is carried out from the positive electrode transport portion 22, as shown in FIG. 26, the positive electrode tab 8b of the positive electrode with a separator 11 is already laminated on the laminated portion 21. Interferes only with tab 8b. Further, when the negative electrode 9 is carried out from the negative electrode transport portion 23, although not shown, the negative electrode tab 9b of the negative electrode 9 interferes only with the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21. That is, the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21 interfere with the positive electrode 11 with a separator and the negative electrode 9 supplied to the laminated portion 21 only once. .. As a result, the number of times that the supplied positive electrode 11 with separator and negative electrode 9 interfere with the positive electrode tab 8b of the laminated positive electrode 11 with separator and the negative electrode tab 9b of the negative electrode 9 can be reduced. As a result, it is possible to reduce bending, bending, damage, and the like of the positive electrode tab 8b and the negative electrode tab 9b.

Further, since the positive electrode 11 with a separator and the negative electrode 9 are alternately laminated on the laminated portion 21, in the method of supplying the positive electrode 11 with a separator and the negative electrode 9 as shown in FIG. 25, the positive electrode 11 with a separator and the negative electrode 9 are provided with a separator supplied to the laminated portion 21. The positive electrode 11 and the negative electrode 9 are likely to interfere with both the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21. However, the positive electrode 11 with a separator and the negative electrode 9 are supplied by placing the positive electrode 11 with a separator on the positive electrode transport section 22 as described above and arranging the negative electrode 9 on the negative electrode transport section 23 as described above. Can surely reduce the number of times that interferes with the positive electrode tab 8b of the laminated positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9.

Further, the laminating table 26 is inclined in the horizontal direction so that the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 laminated on the laminating portion 21 face upward. Therefore, since the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 laminated on the laminated portion 21 are located on the upper side, in the method of supplying the positive electrode 11 with a separator and the negative electrode 9 as shown in FIG. The positive electrode 11 with a separator and the negative electrode 9 supplied to the laminated portion 21 are likely to interfere with both the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 already laminated on the laminated portion 21. However, the positive electrode 11 with a separator and the negative electrode are supplied by placing the positive electrode 11 with a separator on the positive electrode transport section 22 as described above and the negative electrode 9 on the negative electrode transport section 23 as described above. The number of times that 9 interferes with the positive electrode tab 8b of the positive electrode 11 with a separator and the negative electrode tab 9b of the negative electrode 9 can be reliably reduced.

Further, in the above embodiment, the collision wall portions 24 and 25 are integrally formed with the positioning wall 27 of the laminated portion 21, but the present invention is not particularly limited, and the collision wall portions 24 and 25 are separate from the laminated portion 21. It may be composed of the parts of.

Further, in the above embodiment, the stacking table 26 of the stacking portion 21 is inclined with respect to the horizontal direction, but if the positioning wall 27 for positioning the positive electrode 11 with a separator and the negative electrode 9 is erected on the stacking table 26. , The stacking table 26 does not have to be inclined with respect to the horizontal direction.

Further, in the above embodiment, in the laminated portion 21, the positive electrode 11 with a separator and the negative electrode 9 in which the positive electrode 8 is wrapped in the bag-shaped separator 10 are alternately laminated, but the present invention is not particularly limited. In the laminated portion 21, the positive electrode and the negative electrode with a separator in a state where the negative electrode is wrapped in a bag-shaped separator may be alternately laminated. At this time, the positive electrode is conveyed by the conveying unit 22, and the negative electrode with a separator is conveyed by the conveying unit 23.

Further, in the laminated portion 21, a sheet-shaped electrode unit in which the positive electrode 11 with a separator and the negative electrode 9 are laminated in advance may be sequentially laminated. At this time, the same electrode unit is conveyed by the conveying units 22 and 23, respectively. In this case, the same electrode unit may be transported by the three transport units.

A specific example of sequentially laminating the electrode units in which the positive electrode 8, the separator 110, and the negative electrode 9 are pre-laminated will be described with reference to FIGS. 27 and 28. As shown in FIG. 27, a strip-shaped separator 110 extending so as to straddle each laminated body is laminated on the laminated body of the positive electrode 8 and the negative electrode 9 arranged in the horizontal direction. Then, after laminating the separator 110, the positive electrode 8, the separator 110 and the negative electrode 9 in this order from the bottom, the electrode unit 150 is formed by cutting the separator 110 between the laminated bodies of the adjacent positive electrode 8 and the negative electrode 9. Form.

Specifically, first, the band-shaped separator 110 is arranged, and then a plurality of positive electrodes 8 that are separated from each other are arranged on the upper surface of the band-shaped separator 10. At this time, the positive electrode tab 8b of the positive electrode 8 is arranged so as to extend from one edge in the width direction of the separator 110. Next, the strip-shaped separator 110 is arranged on the upper surface of the plurality of positive electrodes 8. Next, a plurality of negative electrodes 9 that are separated from each other are arranged on the upper surface of the strip-shaped separator 110. The negative electrode 9 is arranged so as to face the already laminated positive electrode 8. Further, the negative electrode tab 9b of the negative electrode 9 is arranged so as to extend from one edge portion in the width direction of the separator 110. At this time, as shown on the leftmost side of FIG. 27, the separators 110 are joined to each other by a welding line WL along the edge in the width direction of the strip-shaped separator 110. The welding line WL is formed at a position that sandwiches the positive electrode 8 and the negative electrode 9 in the width direction. Therefore, the positive electrode 8 is held so as to be sandwiched between both separators 110 in the thickness direction. On the other hand, the negative electrode 9 is welded to the edge of the separator 110 at the position of the negative electrode tab 9b by the welding line WL. As a result, the negative electrode 9 and the separator are joined. Finally, the strip-shaped separator 110 is cut along the cutting line VL at a position where the positive electrode 8 and the negative electrode 9 are not provided. As a result, the electrode unit 150 composed of the separator 110, the positive electrode 8, the separator 110, and the negative electrode 9 is formed.

As shown in FIG. 28, the electrode unit 150 configured as described above is arranged on the transport units 22 and 23. By transporting such an electrode unit 150, at the time of laminating at the laminating portion 21, the laminating related to the order of the separator 110, the positive electrode 8, the separator 110 and the negative electrode 9 is completed. Therefore, the lamination can be performed in a short time as compared with the case where the positive electrode 8 and the negative electrode 9 are individually conveyed and laminated.

Further, in the above embodiment, the power storage device 1 is a lithium ion secondary battery, but the present invention is not particularly limited to the lithium ion secondary battery, and other secondary batteries such as a nickel hydrogen battery and an electric double layer. It can also be applied to stacking electrodes in a power storage device such as a capacitor or a lithium ion capacitor. Further, the present invention is not particularly limited to electrodes, and can be applied to any laminating device for sequentially laminating sheet-like bodies.

8a ... Positive electrode main body (main body), 8b ... Positive electrode tab (protruding part), 9 ... Negative electrode (second sheet, sheet-like body), 9a ... Negative electrode main body (main body), 9b ... Negative electrode tab (protruding part) , 11 ... Positive electrode with separator (first sheet, sheet-like body), 20 ... Laminating device, 21 ... Laminating part, 22 ... Conveying part (first transporting part), 22a ... Conveying surface, 23 ... Conveying part (second transporting part) Part), 23a ... Transport surface, 24 ... Collision wall part (first collision wall part), 24a ... Collision surface, 25 ... Collision wall part (second collision wall part), 25a ... Collision surface, 26 ... Laminating base, 27 ... Positioning wall, 28 ... Side wall, 29 ... Bottom wall, 33, 34 ... Tapered, 35 ... Cushioning material, 40 ... Air blow, 45 ... Cover, 46 ... Drive, 61 ... Suction (first suction) ), 62 ... Suction part (second suction part).

Claims (15)

A laminated portion having a laminating base on which the first sheet and the second sheet constituting the sheet-like body are laminated, and a laminating portion.
A first transport unit that horizontally transports the first sheet toward the laminated portion, and a first transport unit.
A second transport section that is arranged so as to face the first transport section with the laminated section in between and transports the second sheet in the horizontal direction toward the laminated section.
A first collision wall portion, which is arranged above the stacking table and causes the first sheet transported by the first transport portion to collide and drop onto the stacking portion.
A second collision wall portion that is arranged above the stacking table so as to face the first collision wall portion and collides with the second sheet conveyed by the second transport portion and drops onto the laminated portion. Prepare ,
The laminated portion is erected on the laminated table and has a positioning wall for positioning the sheet-like body.
The positioning wall has a plurality of side wall portions that come into contact with both side edges of the sheet-like body to align the positions of both side edges of the sheet-like body, and the bottom edge of the sheet-like body that comes into contact with the bottom edge of the sheet-like body. It has a bottom wall that aligns the edges,
The stacking table is inclined with respect to the horizontal direction so that the bottom wall portion is located on the lower side.
An air blow that blows air onto the sheet-like body that has already been laminated on the laminated portion is further provided.
The sheet-like body has a main body portion and a protruding portion that is integrated with the main body portion and protrudes from the laminating table in a state of being laminated on the laminating portion.
The air blow is a laminating apparatus characterized in that the air is blown onto the protruding portion of a sheet-like body already laminated on the laminating portion to bend the protruding portion downward. A laminated portion having a laminating base on which the first sheet and the second sheet constituting the sheet-like body are laminated, and a laminating portion.
A first transport unit that horizontally transports the first sheet toward the laminated portion, and a first transport unit.
A second transport section that is arranged so as to face the first transport section with the laminated section in between and transports the second sheet in the horizontal direction toward the laminated section.
A first collision wall portion located on an extension line of the first transport portion from the first transport portion toward the laminated portion and arranged between the stacking table and the transport surface of the second transport portion. ,
It is located on an extension line of the second transport portion from the second transport portion toward the laminated portion so as to face the first collision wall portion, and the stacking table and the transport surface of the first transport portion. and a second collision wall portion disposed between,
The laminated portion is erected on the laminated table and has a positioning wall for positioning the sheet-like body.
The positioning wall has a plurality of side wall portions that come into contact with both side edges of the sheet-like body to align the positions of both side edges of the sheet-like body, and the bottom edge of the sheet-like body that comes into contact with the bottom edge of the sheet-like body. It has a bottom wall that aligns the edges,
The stacking table is inclined with respect to the horizontal direction so that the bottom wall portion is located on the lower side.
An air blow that blows air onto the sheet-like body that has already been laminated on the laminated portion is further provided.
The sheet-like body has a main body portion and a protruding portion that is integrated with the main body portion and protrudes from the laminating table in a state of being laminated on the laminating portion.
The air blown, laminated device according to claim Rukoto bending the projecting portion downward the air is blown to the projecting portion of the laminate already sheet product in the stacking unit. A laminated portion having a laminating base on which the first sheet and the second sheet constituting the sheet-like body are laminated, and a laminating portion.
A first transport unit that horizontally transports the first sheet toward the laminated portion, and a first transport unit.
A second transport section that is arranged so as to face the first transport section with the laminated section in between and transports the second sheet in the horizontal direction toward the laminated section.
A first collision wall portion, which is arranged above the stacking table and causes the first sheet transported by the first transport portion to collide and drop onto the stacking portion.
A second collision wall portion that is arranged above the stacking table so as to face the first collision wall portion and collides with the second sheet conveyed by the second transport portion and drops onto the laminated portion. Prepare ,
The laminated portion is erected on the laminated table and has a positioning wall for positioning the sheet-like body.
The positioning wall has a plurality of side wall portions that come into contact with both side edges of the sheet-like body to align the positions of both side edges of the sheet-like body, and the bottom edge of the sheet-like body that comes into contact with the bottom edge of the sheet-like body. It has a bottom wall that aligns the edges,
The stacking table is inclined with respect to the horizontal direction so that the bottom wall portion is located on the lower side.
A cover arranged above the laminated portion and
Further provided with a drive unit for moving the cover,
The sheet-like body has a main body portion and a protruding portion integrated with the main body portion.
The driving unit is a laminating device characterized in that the cover is moved between a position of covering the protruding portion of a sheet-like body already laminated on the laminating portion and a position of retracting the laminated portion. A laminated portion having a laminating base on which the first sheet and the second sheet constituting the sheet-like body are laminated, and a laminating portion.
A first transport unit that horizontally transports the first sheet toward the laminated portion, and a first transport unit.
A second transport section that is arranged so as to face the first transport section with the laminated section in between and transports the second sheet in the horizontal direction toward the laminated section.
A first collision wall portion located on an extension line of the first transport portion from the first transport portion toward the laminated portion and arranged between the stacking table and the transport surface of the second transport portion. ,
It is located on an extension line of the second transport portion from the second transport portion toward the laminated portion so as to face the first collision wall portion, and the stacking table and the transport surface of the first transport portion. and a second collision wall portion disposed between,
The laminated portion is erected on the laminated table and has a positioning wall for positioning the sheet-like body.
The positioning wall has a plurality of side wall portions that come into contact with both side edges of the sheet-like body to align the positions of both side edges of the sheet-like body, and the bottom edge of the sheet-like body that comes into contact with the bottom edge of the sheet-like body. It has a bottom wall that aligns the edges,
The stacking table is inclined with respect to the horizontal direction so that the bottom wall portion is located on the lower side.
A cover arranged above the laminated portion and
Further provided with a drive unit for moving the cover,
The sheet-like body has a main body portion and a protruding portion integrated with the main body portion.
The driving unit is a laminating device characterized in that the cover is moved between a position of covering the protruding portion of a sheet-like body already laminated on the laminating portion and a position of retracting the laminated portion. A laminated portion having a laminating base on which the first sheet and the second sheet constituting the sheet-like body are laminated, and a laminating portion.
A first transport unit that horizontally transports the first sheet toward the laminated portion, and a first transport unit.
A second transport section that is arranged so as to face the first transport section with the laminated section in between and transports the second sheet in the horizontal direction toward the laminated section.
A first collision wall portion, which is arranged above the stacking table and causes the first sheet transported by the first transport portion to collide and drop onto the stacking portion.
A second collision wall portion that is arranged above the stacking table so as to face the first collision wall portion and collides with the second sheet conveyed by the second transport portion and drops onto the laminated portion. Prepare ,
The second collision wall portion is formed with a first suction portion that sucks the first sheet that is conveyed by the first transport portion and collides with the first collision wall portion.
A laminating device characterized in that a second suction portion that is conveyed by the second transport portion and sucks the second sheet that collides with the second collision wall portion is formed on the first collision wall portion. A laminated portion having a laminating base on which the first sheet and the second sheet constituting the sheet-like body are laminated, and a laminating portion.
A first transport unit that horizontally transports the first sheet toward the laminated portion, and a first transport unit.
A second transport section that is arranged so as to face the first transport section with the laminated section in between and transports the second sheet in the horizontal direction toward the laminated section.
A first collision wall portion located on an extension line of the first transport portion from the first transport portion toward the laminated portion and arranged between the stacking table and the transport surface of the second transport portion. ,
It is located on an extension line of the second transport portion from the second transport portion toward the laminated portion so as to face the first collision wall portion, and the stacking table and the transport surface of the first transport portion. and a second collision wall portion disposed between,
The second collision wall portion is formed with a first suction portion that sucks the first sheet that is conveyed by the first transport portion and collides with the first collision wall portion.
A laminating device characterized in that a second suction portion that is conveyed by the second transport portion and sucks the second sheet that collides with the second collision wall portion is formed on the first collision wall portion. The laminated portion is erected on the laminated table and has a positioning wall for positioning the sheet-like body.
The laminating device according to any one of claims 1 to 6, wherein the first collision wall portion and the second collision wall portion are integrated with the positioning wall. The surfaces of the first collision wall portion and the second collision wall portion where the sheet-like bodies collide with the first collision wall portion toward the upper end surfaces of the first collision wall portion and the second collision wall portion. The laminating apparatus according to claim 7, further comprising a tapered portion that widens the width between the second collision wall portion and the second collision wall portion. The positioning wall has a plurality of side wall portions that come into contact with both side edges of the sheet-like body to align the positions of both side edges of the sheet-like body, and the bottom edge of the sheet-like body that comes into contact with the bottom edge of the sheet-like body. It has a bottom wall that aligns the edges,
The stacking table is inclined with respect to the horizontal direction so that the bottom wall portion is located on the lower side.
The laminating device according to claim 7 or 8, wherein the first collision wall portion and the second collision wall portion are integrated with the plurality of side wall portions, respectively. The lamination according to any one of claims 1 to 9 , wherein a cushioning material is attached to the surface of the first collision wall portion and the second collision wall portion where the sheet-like body collides. apparatus. The first suction portion is inclined diagonally upward, and the region on the second collision wall side side of the first sheet at the time of collision with the first collision wall portion is sucked.
The second suction portion is inclined toward the obliquely upward, of the second sheet at the time of collision with the second collision wall section, to suck the region of the first collision wall portion side, according to claim 5 Or the laminating apparatus according to 6. In response to the supply of the first sheet from the first transport section and the supply of the second sheet from the second transport section, the first suction section and the second suction section alternately perform suction. The laminating apparatus according to claim 5, 6 or 11. The first suction unit is arranged on the center side of the first sheet when it is supplied from the first transport unit in the width direction of the first transport unit.
According to claim 5, 6, 11 or 12 , the second suction unit is arranged on the center side of the second sheet when it is supplied from the second transport unit in the width direction of the second transport unit. The laminating apparatus according to the description. The first sheet and the second sheet are electrodes which are positive electrodes and negative electrodes having tabs protruding from one side of a rectangular main body portion.
The electrodes are arranged on the first transport unit so that one side is parallel to the first transport direction and the tab is located on the upstream side in the transport direction.
Any one of claims 1 to 13 on which the electrode is placed on the second transport portion so that one side is parallel to the second transport direction and the tab is located on the upstream side in the transport direction. The laminating apparatus according to the section. The laminated board is the product layer device according to claim 14, characterized in that said tabs of said electrode stacked in the stacking section is inclined with respect to the horizontal direction to face upward.

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