JP2014103082A - Power storage element and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage element such as a secondary battery and a manufacturing method thereof, in which chips of an electrodes do not easily enter with a simple configuration.SOLUTION: In a power storage element 100, an integral long body 41 in which a long separator 30 sandwiches a long electrode plate 1 having a negative electrode active material layer 12 on both sides of a copper foil 10 is bent zigzag, and a plurality of strip-shaped electrode plates 2 having positive electrode active material layers 22 on both side thereof are held alternately between the integral long body 41 that is bent zigzag. The long electrode plate 1 has a small cut portion so as to cause hardly produce chips resulting in enabling self-discharge of the power storage element to be suppressed and a number of strip-shaped electrode plates 2 to be easily produced. Therefore, deterioration in self-discharge property caused by mixture with chips can be prevented with simple configuration and easy production.

Description

  The present invention relates to a storage element including a primary battery, a secondary battery, various capacitors, and the like, and a method for manufacturing the same.

  Patent Document 1 has an integrated body of a large number of strip-shaped positive electrodes and two long separators, and the integrated body is alternately folded at a portion between the strip-shaped positive electrodes, and a large number of strip-shaped negative electrodes in between. Has been disclosed, and a laminated secondary battery in which both separators are in a fold-like shape is disclosed. In this integrated body, a large number of strip-shaped positive electrodes are sandwiched between two long separators, and both separators are welded to each other on three sides excluding the positive terminal portion protruding from one of the two positive electrodes. Is formed. Each of these strip-shaped negative electrodes has a negative electrode terminal portion that protrudes from the integrated body in a direction opposite to the positive electrode terminal portion.

  In Patent Document 2, one strip-like positive and negative long electrode plate, two long separators sandwiching the long electrode plate from both sides thereof, and both long separators from both outer sides are also disclosed. A battery stack (stacked battery) having two positive and negative comb-shaped electrode plates sandwiched therebetween is disclosed. The two comb-shaped electrode plates have a relatively complicated comb-shaped shape, and one long electrode plate, two separators and a comb-shaped electrode plate are stacked at appropriate positions, After that, the integrated body is folded to form a battery stack.

JP 2009-117291 A JP 2011-258434 A

  However, in the battery of Patent Document 1 among the above-described background art, both positive and negative electrodes of the battery electrode are a large number of strip electrodes, and are formed on a conductive plate (aluminum or copper metal foil) serving as a base material and both surfaces thereof. There are many places where the positive and negative electrode active material layers are cut.

  Therefore, not only is the number of cutouts cut out of the positive and negative strip electrode plates included in one battery, but the total length of the cutout is also considerably long, and the metal foil generated along with the cutting process of cutting out both electrodes and Many chips of the active material layer are likely to be generated. If such electrode chips are mixed into the battery, it may cause heat generation due to a local short circuit and a decrease in battery performance, and it is disadvantageous because self-discharge increases and the defective rate of the battery increases.

  In the battery of Patent Document 2, the cutting part is extremely limited for the long electrode plate of the positive and negative (negative electrode in the embodiment) and the two long separators, and there is almost no generation of chips. There is no problem. Therefore, in the configuration of Patent Document 2, it can be expected that the generation of chips is almost halved compared to the configuration of Patent Document 1 described above.

  Therefore, an object of the present invention is to provide a power storage element that has a simple configuration and in which electrode chips are not easily mixed, and a method for manufacturing the same.

  In this section, the configuration of the present invention for solving the above-described problems and the effects brought about by the configuration will be briefly described.

[Invention of goods]
The storage element (100, 200) of the present invention is either a battery (100) which is a primary battery or a secondary battery, or a capacitor (100, 200). An electrolytic capacitor corresponds to one (100) of the two types of capacitors (100, 200). The storage element (100, 200) includes one electrode plate (1, 1A, 201), the other electrode plate (2, 202), and a separator (3:30 to 36) inserted between these two electrode plates. , 203) are alternately stacked.

  The one electrode plate (1, 1A, 201) is in intimate contact with the separator (3, 203) on both sides, and is a long strip that is alternately folded at predetermined intervals in the longitudinal direction and stacked in a twisted manner. It is an electrode plate (referred to as a long electrode plate) (1, 1A, 201) made of a flexible material. The other electrode plate (2, 202) is in close contact with the separator (3, 203) on both sides, and a plurality of independent strip-shaped electrode plates (referred to as strip-shaped electrode plates) (2, 202). It is. Here, the long electrode plate (1, 1A, 201) has a terminal portion (referred to as one terminal portion) (11) protruding in one of both directions along the fold direction of the fold. On the other hand, each of the strip-shaped electrode plates (2, 202) has a terminal portion (referred to as the other terminal portion) (21) protruding to the other of the two directions.

  The power storage device (100, 200) of the present invention is a solution different from the invention disclosed in Patent Document 2, but has an effect that electrode chips are less likely to be mixed as compared to the battery of Patent Document 1. . This is because one electrode plate (1, 1A, 201) is alternately folded at a predetermined interval in the longitudinal direction, and is made of a long flexible material (1, 1A, 201), the amount of cutting is small and the generation of chips is almost halved. In addition, even when compared with the battery stack of Patent Document 2, it is not necessary to cut the other electrode plate into a complicated shape, so that the process of making the other electrode plate is easy and the processing equipment can be simplified. I can expect.

  The separator (3, 203) is made of an insulating film and is a long separator (referred to as a long separator) folded in contact with both surfaces of the long electrode plate (1, 1A, 201) (30 to 30). 32, 203). Here, the separator (3, 203) is folded back on the other side facing away from the protruding direction of the one terminal portion (11), and a part of the long electrode plate (1, 1A, 201) is removed from both sides. It is good also as one sheet of the above-mentioned long separators (referred to as a two-fold type separator) (30, 203). Alternatively, the two long separators (referred to as sandwich separators) (31, 32) that sandwich the both sides of the long electrode plate (1, 1A, 201) while leaving the one terminal portion (11) (31, 32) It is good.

  In any case, the long separator (30 to 32, 203) is advantageous in that it requires less cutting of the separator itself, and is easy to process and less likely to generate separator chips. .

  The insulating film constituting the separator (3, 203) may be one containing one or more kinds of ceramic particles inside or coated on the surface.

[Invention of its production method]
The manufacturing method of the electrical storage element (100, 200) of this invention has a preparatory process (P11), an integration process (P21, P22), and a lamination process (P31).

  In the preparation step (P11), one long electrode plate (1, 1A, 201), a plurality of strip electrode plates (2, 202), and a predetermined number of long separators (30 to 32, 203) are prepared. It is a process to do. Here, the long electrode plate (1, 1A, 201) has a predetermined width in one direction and is long in the longitudinal direction perpendicular to the width direction (referred to as the width direction), and is made of a flexible material. It is one electrode plate which becomes. On the other hand, the strip-shaped electrode plate (2, 202) is the other electrode plate composed of a plurality of strip-shaped electrode plates independent of each other. Further, the long separator (30 to 32, 203) has a predetermined width in the one direction and is long in the longitudinal direction with respect to this width and is adjusted to a predetermined size and shape made of an insulating film. It is.

  In the integration step (P21, P22), the long separator (30-32, 203) covering the both surfaces of the long electrode plate (1, 1A, 201) and the long electrode plate (1, 1A, 201). ) And an integrated long object (41-43, 204). At this time, the long separators (30 to 32, 203) are left in the long electrode plate (1, 1A, 201), leaving one terminal portion (11) protruding in one of the width directions. It is made to contact | adhere to both surfaces of an electrode plate (1, 1A, 201).

  In the stacking step (P31), the integrated long objects (41 to 43, 204) are alternately folded with a predetermined width in the longitudinal direction to form a storage element (100, 200) that is a twisted electrode stack. It is a process to do. At this time, each of the strip-shaped electrode plates (2, 202) is left with the other terminal portion (21) projecting to the other in the width direction, and each of the strip-shaped electrode plates (2, 202) is integrated with the long length. The sheets (41 to 43, 204) are alternately folded one by one.

  According to the manufacturing method of such an electrical storage element (100, 200), since there is little cutting process in the manufacturing process of a long electrode plate (1, 1A, 201), compared with the method of manufacturing the battery of patent document 1. It is considered that the generation of chip on the electrode plate is almost halved. As a result, although this manufacturing method is different from the method of manufacturing the battery laminate of Patent Document 2, according to this manufacturing method, a product with fewer defects can be produced in manufacturing the storage element (100, 200) including the battery. There is an effect that it can be manufactured. Moreover, compared with the method for manufacturing the battery laminate of Patent Document 2, it is not necessary to cut the other electrode plate (2, 2A, 202) into a complicated shape, and therefore the other electrode plate (2, 2A, 202). ) Can be easily processed and the processing equipment can be simplified.

  Note that the integration step (P21, P22) may be either a bi-fold integration step (P21) or a sandwich integration step (P22). Here, in the two-fold integration step (P21), the separator (30) is a single sheet, and the separator (30) is folded in two along the center line of the width along the longitudinal direction. This is a step of wrapping and covering both sides of the long electrode plate (1) while leaving one terminal portion (11) of the long electrode plate (1, 1A, 201). On the other hand, in the sandwich integration step (P22), the separators (31, 32) are two, and the long electrode plates (1, 1A, 201) are left with the one terminal portion (11). The long electrode plates (1, 1A, 201) are sandwiched and covered with both separators (31, 32).

  In any case, the long separator (30 to 32) is convenient because it requires less cutting of the separator itself, and is easy to process and less likely to generate separator chips.

Sectional drawing which shows typically the laminated structure of the battery as an electrical storage element of Example 1. FIG. FIG. 4 is a diagram illustrating a battery folding method according to the first embodiment. FIG. 4A is a perspective view illustrating a configuration of a long electrode plate. FIG. 5B is a process of folding a long separator in half and sandwiching the long electrode plate. Perspective view (c) Perspective view of an integral long object in which a long electrode plate is sandwiched between long separators The perspective view which shows notionally a lamination process among the battery manufacturing methods of Example 1. FIG. Process flow diagram schematically showing all steps of the battery manufacturing method of Example 1 (B) A perspective view of a process in which a long separator is folded in half and a long electrode plate is sandwiched between the long electrode plates. Fig. (C) Perspective view of an integral long object with a long electrode plate sandwiched between long separators FIG. 4 is a set of diagrams showing a step of folding a long electrode plate in the battery manufacturing method of Example 3. (a) A perspective view showing an initial configuration of a long electrode plate having a bi-fold structure. (B) Folding the long electrode plate in half from the initial configuration. (C) Perspective view showing the configuration of a long electrode plate having a double-fold structure (d) Perspective view of the process of folding the long separator in half and sandwiching the long electrode plate (e) Long electrode Perspective view of an integrated long object with a plate and long separator folded in half (B) A perspective view showing an initial configuration of each strip-shaped electrode plate having a double-fold structure. (B) Each strip-shaped electrode plate from the initial configuration. (C) Perspective view showing the configuration of each strip-shaped electrode plate having a double-fold structure Assembly drawing mainly showing strip integration step in battery manufacturing method of Example 4 (a) Perspective view showing configuration of long electrode plate prepared in preparation step (b) Pasting each member in strip integration step (C) The perspective view which shows the structure of the strip-shaped integrated object manufactured at the strip integration process The perspective view which shows notionally a lamination process among the battery manufacturing methods of Example 4. FIG. The perspective view which shows the strip integration process in the deformation | transformation aspect 1 of Example 4. FIG. The perspective view which shows the strip integration process in the deformation | transformation aspect 2 of Example 4. FIG. Sectional drawing which shows notionally the structure of the capacitor as Example 5

  Embodiments of the “electric storage element and the method for manufacturing the same” of the present invention will be described clearly and sufficiently in the following description so that those skilled in the art can understand the present invention to implement the present invention. At the time of filing of the present invention, the inventor considers that the best embodiment is disclosed in any of the following examples or modifications thereof.

(Configuration of battery as power storage element)
The power storage device as Example 1 of the present invention is a lithium ion secondary battery (LIB, hereinafter simply referred to as “battery”) 100 having a laminated structure as shown in cross section in FIG. The battery 100 is configured by alternately laminating a negative electrode plate 1 as one electrode plate, a positive electrode plate 2 as the other electrode plate, and a separator 30 inserted between both electrode plates 1 and 2. Electrode laminate.

  The negative electrode plate 1 is in close contact with the separator 3 on both sides, and is an electrode plate (long electrode plate) made of a long flexible material that is alternately folded at a predetermined interval in the longitudinal direction and stacked in a folded shape. 1). The long electrode plate 1 of the negative electrode has negative electrode active material layers 12 formed on both surfaces of the copper foil 10, and protrudes in one of the two directions along the extending direction of the crease fold (F portion in FIG. 1). The negative terminal portion 11 which is the one terminal portion. That is, the negative terminal portion 11 protrudes in one of the vertical directions with respect to the paper surface of FIG.

  In addition, as shown to Fig.2 (a), the negative electrode terminal part 11 is only the copper foil 10, and the negative electrode active material layer 12 is not formed in any surface.

  The separator 30 is a battery separator made of a long insulating film and capable of moving charges in the thickness direction. In this embodiment, the insulating film includes one or more kinds of ceramic particles. As other embodiments, an insulating film in which one or more kinds of ceramic particles are coated on the surface may be adopted, or an insulating layer composed of ceramic particles and an organic component may be adopted as the insulating film. As shown in FIG. 1 again, the separator 30 is folded in contact with both surfaces of the negative electrode plate 1.

  As shown in FIGS. 2B to 2C, the separator 30 is a single two-fold type separator that is folded back at the edge on the other side facing away from the protruding direction of the negative electrode terminal portion 11. And the separator 30 has wrapped the part in which the negative electrode active material layer 12 was formed among the copper foil 10 of the elongate electrode plate 1 of a negative electrode from both surfaces. That is, as shown in FIG. 2 (c), the long electrode plate 1 of the negative electrode and the bi-fold separator 30 that wraps both sides thereof are integrated to form an integral long object 41.

  As shown in FIG. 1 again, the positive electrode plate 2 is in close contact with the separator 3 on both sides, and is a large number of independent strip-shaped electrode plates (referred to as strip-shaped electrode plates 2). As shown in FIG. 3, each strip-shaped electrode plate 2 of the positive electrode has a positive electrode active material layer 22 formed on both surfaces of the aluminum foil 20, and the other of the two directions (the other in the direction perpendicular to the paper surface of FIG. 1). ) Has a positive terminal portion 21 which is the other terminal portion projecting to). The positive electrode terminal portion 21 is made of an aluminum foil 20, and the positive electrode active material layer 22 is not formed on any surface thereof.

  Then, as shown in FIG. 3, a strip-shaped electrode plate 2 which is a large number of negative electrodes is alternately laminated on both sides of an integrated long object 41 composed of a long electrode plate 1 which is a positive electrode and a bi-fold separator 30. Thus, the battery 100 as the electrode laminate having the configuration shown in FIG. 1 is formed again. When laminating the single long sheet 41 and a large number of strip-shaped electrode plates 2, the long one-piece 41 is folded in a fold, and the strip-shaped electrode plate 2 is inserted from both sides between the long sheets. The battery 100 has a structure sandwiched between the objects 41.

  As shown in the lower left part of FIG. 1, the end portion 40 of the bi-fold separator 30 protrudes from the end portion of the long electrode plate 1 on the end face 40 in the longitudinal direction of the integrated long object 41, and the length of the negative electrode is long. Contact between the electrode plate 1 and the strip-shaped electrode plate 2 serving as the positive electrode is prevented. The same applies to the end face (not shown) in the longitudinal direction of the integrated long object 41. Note that the end portions of the projecting fold-type separator 30 may be joined to prevent contact between the positive electrode 1 and the negative electrode 2 more completely.

  The battery 100 having the above configuration can be manufactured by the following method for manufacturing a power storage element.

(Manufacturing method)
The method for manufacturing a storage element of the present invention is a method for manufacturing a battery 100, and includes a preparation step P11, an integration step P21, and a stacking step P31, as shown in FIG.

  First, the preparation step P11 is a step of preparing a long electrode plate 1 as a negative electrode, a strip-shaped electrode plate 2 as a predetermined number of positive electrodes, and a single long folding separator 30. is there. In the upper half of FIG. 4, two systems for preparing the long electrode plate 1 and each strip-shaped electrode plate 2 are depicted, and the drawing of the process for preparing the separator 30 is omitted.

  As shown in FIG. 2A, the long electrode plate 1 has a predetermined width in one direction and is long and flexible in a longitudinal direction perpendicular to the width direction (referred to as a width direction). A negative electrode plate made of a material, the configuration of which is as described in the previous section. As shown in FIG. 3 again, the strip-shaped electrode plate 2 is a positive electrode plate composed of a predetermined number of strip-shaped electrode plates independent from each other, and the configuration thereof is as described in the previous section. The long separator 30 has a predetermined width in the one direction, and an insulating film or one or more types of insulating films arranged in a predetermined dimension and shape made of a flexible material that is long in the longitudinal direction with respect to this width. An insulating film battery separator containing or coated with ceramic particles.

  The dimensions of the long electrode plate 1, each strip-shaped electrode plate 2 and the long separator 30 are the negative electrode active material layers of the long electrode plate 1 as shown in FIGS. 12 and the positive electrode active material layer 22 of each strip-shaped electrode plate 2 face each other only through the long separator 30. The long electrode plate 1 and each strip-shaped electrode plate 2 are not in direct contact with each other.

  Next, as shown in FIGS. 2 (b) to 2 (c), the integration step P <b> 21 leaves the negative electrode terminal portion 11 in the long electrode plate 1 and the long separator 30 on both surfaces of the long electrode plate 1. This is a process for producing an integrated long object 41 in which the long separator 30 and the long electrode plate 1 that are in close contact and cover both surfaces of the long electrode plate 1 are integrated. In this step, the long separator 30 is folded in half along the longitudinal direction along the center line of the width, and the negative electrode portion 11 of the long electrode plate 1 is left and the both sides of the long electrode plate 1 are wrapped. Cover with. Therefore, in the manufacturing method of the present embodiment, the integration step P21 is referred to as a two-fold integration step P21.

  Finally, in the stacking step P31, the strip electrode plates 2 are alternately disposed on both sides of the integrated long object 41, leaving the positive electrode terminal portion 21 protruding to the other of the strip electrode plates 2 in the width direction. In this process, the integrated long object 41 is alternately folded at a predetermined width in the longitudinal direction. When the stacking step P31 is completed, as described in the previous section, the battery 100 which is a folded electrode stack having the cross section shown in FIG. 1 is formed.

(Function and effect)
Since the battery 100 and the manufacturing method thereof according to the present embodiment are configured as described above, the electrode 100 is different from the battery disclosed in Patent Document 2 as compared with the battery disclosed in Patent Document 2. There is an effect that chips are difficult to mix. This is because the long electrode plate 1 as a negative electrode is a single member made of a long flexible material that is alternately folded at a predetermined interval in the longitudinal direction and laminated in a fold-like manner. This is because the cutting process is particularly small in the manufacturing process compared to the battery, and the generation of chips is almost halved.

  Compared to the battery laminate of Patent Document 2, the processing of making the electrode plate is easy because it is not necessary to cut the electrode plate into a complicated shape such as a comb shape. I can expect.

  Furthermore, since the half-folded long separator 30 requires less cutting of the separator itself, it is easy to process and hardly generates chips during separator processing. In addition, since the long electrode plate 1 and the long separator 30 constitute the integrated long object 41 and then the laminating step P31 for folding the strip-shaped electrode plate 2 in a fold is performed, the number of steps in the laminating step P31 is small. Convenient and convenient.

(Modification 1)
As a modified example 1 of the present embodiment, an embodiment in which the positive and negative electrodes of the long electrode plate 1 and each strip-shaped electrode plate 2 are reversed can be implemented.

  In the current technology, in the lithium ion secondary battery, the positive electrode and the negative electrode as in Example 1 are more rational, but in the future, the materials constituting both the electrode plates 1 and 2 and the separator 30 will advance, The physical characteristics will also change. In such a case, there is a possibility that the configuration in which the positive electrode and the negative electrode are reversed from those of Example 1 as in this modified embodiment may be rational.

  In addition, the embodiment in which the positive electrode and the negative electrode are reversed as in this modified embodiment is similarly applied to the batteries as the following examples and the modified embodiments thereof.

(Modification 2)
As a modified embodiment 2 of the present embodiment, a capacitor having a configuration that is substantially the same as that of the first embodiment (see FIG. 1) can be implemented, for example, a LIC (lithium ion capacitor). In the LIC, the positive electrode is a number of strip-shaped electrode plates 2 having activated carbon layers 22 on both surfaces of the aluminum foil 20, and the negative electrode is the long electrode plate 1 having activated carbon layers 12 on both surfaces of the copper foil 10. . Even with the capacitor of this configuration, the same effects as those of the first embodiment can be obtained, and inconveniences such as an increase in the defect rate due to mixing of chips are reduced.

  In addition, in the following Examples 2 to 4 and various modifications thereof, it is possible to implement modifications in which a capacitor such as a LIC is made by changing in substantially the same manner as this modification.

(Battery configuration)
A battery (not shown in the whole figure) as Example 2 of the electricity storage device of the present invention has a separator configuration different from Example 1, and as shown in FIG. Is used. That is, as shown in FIG. 5 (c), the separators 31 and 32 are two film-like separators sandwiching the long electrode plate 1 from both sides, leaving the negative terminal portion 11, and are long electrodes. The plate 1 and the separators 31 and 32 constitute an integral long object 42.

  The configuration of the battery of this example is different from that of Example 1 in the above points, and the cross-sectional view is the same as that of FIG. Therefore, not only the structure but also the appearance and performance are almost the same as the battery 100 of the first embodiment.

(Manufacturing method)
The battery manufacturing method of this example is different from Example 1 only in the preparation process and the integration process, and the overall view of the processing process can be combined with FIG. 4 described above.

  First, in the preparation process P11, as shown in FIG. 5B, only the separators 31 and 32 separated into two sheets are prepared, which is different from the first embodiment.

  Next, in the integration process, a process different from the two-fold integration process P21 in the first embodiment is adopted. That is, in this embodiment, as shown in FIGS. 5B to 5C, the long electrode plate 1 is formed by the two long separators 31 and 32 except for the negative electrode terminal portion 11 in the long electrode plate 1. The sandwich integration process P22 is adopted, which is sandwiched and covered from both sides. As a result, as shown in FIG. 5C again, an integrally long object 42 composed of the long electrode plate 1 and the separators 31 and 32 is formed.

  The last stacking step is the same as in the first embodiment except that the integrated long object 42 having the sandwich-type long separators 31 and 32 is folded instead of the integrated long object 41 having the two-fold separator 30 of the first embodiment. This is the same as the first stacking step P31.

(Function and effect)
In the battery of this embodiment and the manufacturing method thereof, as described above, the integrated long object 42 having the sandwich-type long separators 31 and 32 is used as a component, and accordingly, the sandwich integration is performed instead of the two-fold integration step P21. Step P22 is employed in the manufacturing process. Except for this point, as described above, there is almost no difference from the first embodiment, so that the present embodiment can obtain substantially the same operational effects as the first embodiment.

(Modification 1)
Similar to the modified embodiment 1 of the first embodiment, the present embodiment can be implemented with a modified embodiment in which the positive and negative electrodes are reversed, and the future possibility is the same as the modified embodiment 1 of the first embodiment.

(Battery configuration)
In the battery of this example (the whole figure is omitted), the configuration of the negative long electrode plate 1A and the positive electrode strips 2A is different from that of the first example.

  That is, as shown in FIGS. 6A to 6C, as the conductive foil-like material of the long electrode plate 1A, copper having a width approximately twice that of the copper foil 10 of Example 1 and a thickness of approximately half is used. A foil 10A is used. Then, the active material layer 12 is formed on a predetermined portion including the central portion of the width of one side of the copper foil 10A, and the copper foil 10A is folded in half at the center line corresponding to the center of the width, and the active material layer 12 is formed on both sides. A two-fold long electrode plate 1A having a material layer 12 is employed.

  Then, as shown in FIGS. 6D to 6E, a bi-folded separator 30 is covered as in Example 1 so as to cover the negative electrode active material layer 12 of the long electrode plate 1A folded in half. A long object 43 is formed.

  On the other hand, as shown in FIGS. 7A to 7C, the conductive foil-like material 23A of each strip-shaped electrode plate 2A is about twice as thick as the aluminum foil 20 of Example 1 and about half the thickness. The aluminum foil 20A is used. Then, after the positive electrode active material layer 22 is formed on a predetermined part of one side of the aluminum foil 20A, the aluminum foil 20 is folded in half together with the positive electrode active material layer 22, and is folded in half with the positive electrode active material layer 22 on both sides. An electrode plate 2A having a structure is formed.

  Therefore, if the cross section of the battery of this embodiment is shown, only a few revisions may be made to FIG. That is, instead of the long electrode plate 1 of the negative electrode and the respective strip-shaped electrode plates 2 of the positive electrode, the long electrode of the negative electrode having an outline line indicating that it is joined in half at the middle of the thickness. It suffices that the plate 1A and each of the strip-like electrode plates 2A of the positive electrode are drawn in FIG. If it does so, it will become sectional drawing which shows notionally the principal part of the battery structure of a present Example.

(Manufacturing method)
As can be seen from the battery configuration described above, the battery manufacturing method of this example is different from Example 1 in part of the preparation step P11.

  That is, the preparation process P11 includes a long electrode plate folding process P111 and a strip-shaped electrode plate folding process P112 as indicated by reference numerals P111 and P112 in parentheses in FIG. 4 again.

  In the long electrode plate folding step P111, the negative electrode active material layer 12 is formed with a predetermined width on a part of the one surface of the copper foil 10A of the long electrode plate 1A including the central portion in the width direction. Then, the copper foil 10A is folded in half so that one side on which the negative electrode active material layer 12 is formed is on the outside, and a long electrode plate 1A having the negative electrode active material layer 12 on both sides is formed.

  On the other hand, in the strip-shaped electrode plate folding step P112, the positive electrode active material layer 22 is formed with a predetermined width on one surface including the central portion of one surface of the aluminum foil 20A of each strip-shaped electrode plate 2A. Then, the aluminum foil 20A is folded in half so that one surface on which the positive electrode active material layer 22 is formed is on the outside, and each strip-shaped electrode plate 2A having the positive electrode active material layer 22 on both surfaces is formed.

  Other processes are the same as those in the first embodiment.

(Function and effect)
In this embodiment, since the active materials 12 and 22 are formed only on one side of the long electrode plate 1A of the negative electrode and each of the strip-like electrode plates 2A of the positive electrode before being folded in half, the active material is formed. Is easy. Further, since the thickness of the copper foil 10A of the long electrode plate 1A is halved compared to the first embodiment, the integrated long object 43 composed of the long electrode plate 1 and the long separator 30 is formed in a fold-like shape. May be easier when folding. This tendency can be an advantage when manufacturing a battery having a large copper foil 10A.

  The other points are the same as those in the first embodiment except that the preparation step P11 includes the long electrode plate folding step P111 and the strip-shaped electrode plate folding step P112. The following effects can be obtained.

(Modification 1)
In the present embodiment, only one of the long electrode plate 1A and each strip-shaped electrode plate 2A is employed, and the other is the same long electrode plate 1 and each strip-shaped electrode plate 2 as in the first embodiment. The modified embodiment can also be implemented. Also in this modified embodiment, the same effect as in the first embodiment can be obtained in substantially the same manner as in the present embodiment.

(Modification 2)
As a modification 2 of the present embodiment, the separator 3 is two long separators 31 and 32 as in the second embodiment, and the long electrode plate 1A formed by folding in half as described above is sandwiched. It is also possible to implement a battery that is sandwiched between the two. Also in this modified embodiment, the same effect as in the first embodiment can be obtained in substantially the same manner as in the present embodiment.

(Battery configuration)
The structural feature of the battery of this embodiment is that, unlike the above embodiments, the separator 3 is not used with the long separator 30, and both sides of each strip-shaped electrode plate 2 are wrapped with strip-shaped separators. is there. The long electrode plate 1 is the same as that of the first embodiment as shown in FIG.

  That is, as shown in FIGS. 8B to 8C, the separator 3 is a strip made of two strip-shaped films that sandwich a portion of the strip-shaped electrode plate 2 that overlaps the long electrode plate 1 from both sides. Shaped separators 33 and 34. The strip-shaped separators 33 and 34 cover the portion of the strip-shaped electrode plate 2 where the positive electrode active material layer 22 is formed, and are thermally welded on three sides. The positive terminal portion 21 protrudes from the remaining one of the four sides of the strip separators 33 and 34.

(Manufacturing method)
The battery manufacturing method of the present example includes a preparation process P13, a strip integration process P23, and a stacking process P33, which are different from those of the first embodiment.

  First, in the preparation step P13, as shown in FIGS. 8A to 8B, the long electrode plate 1 and the predetermined number of strip-shaped electrode plates 2 similar to those in the first embodiment, and as shown in FIG. 8B. This is a step of preparing a plurality of strip separators 33 and 34 different from the first embodiment.

  Next, in the strip integration step P23, as shown in FIGS. 8B to 8C, the two strip-shaped separators 33 and 34 are formed in each strip-shaped electrode plate 2 while leaving the positive terminal portion 21. Three sides are welded to both surfaces of the electrode plate 2. As a result, as shown in FIG. 8 (c), a strip-shaped integrated body 51 is produced in which the strip-shaped separators 33 and 34 covering both surfaces of each strip-shaped electrode plate 2 are integrated with the strip-shaped electrode plate 2. Is done.

  Finally, in the laminating process P33, as shown in FIG. 9, the strip-shaped integrated objects 51 are alternately folded one by one with respect to both surfaces of the long electrode plate 1 while leaving the positive electrode terminal portion 21. That is, the long electrode plates 1 are alternately folded with a predetermined width in the longitudinal direction while leaving the negative electrode terminal portions 11 that do not overlap the respective strip-shaped electrode plates 2 of the long electrode plates 1, and the strip-shaped integrated objects 51. It is folded in a fold shape while folding. As a result, a substantially rectangular parallelepiped block-shaped electrode laminate is formed in which the negative electrode terminal portion 11 and each positive electrode terminal portion 21 protrude from each other along the width direction, and the battery of this example is obtained.

(Function and effect)
Even in this embodiment, a single long electrode plate 1 is employed as the negative electrode, and since the cutting of the negative electrode is suppressed to a minimum, the generation of chips is almost halved as in the first embodiment, There is an effect that the probability of occurrence of a defect due to mixing of chips is reduced.

  In the present embodiment, since the number of separators 33 and 34 is large, the man-hour is increased as compared with Embodiment 1 or the like, but when it is difficult to form an integral long object with the separator 3 attached to both surfaces of the long electrode plate 1 for some reason. Will be effective.

(Modification 1)
As shown in FIG. 10, it is possible to implement a modification of the battery in which each of the strip-shaped electrode plates 2 employs a bi-folded film separator 35 that is folded back along the edge facing away from the positive electrode terminal portion 21. In the manufacturing method of this modification, the number of parts of the separator 3 is halved compared to the above embodiment, and only the opposite sides of the bi-fold separator 35 need to be welded in the strip integration step P24. There is also an advantage that man-hours at P24 are reduced.

(Modification 2)
As shown in FIG. 11, it is possible to implement a modification of the battery in which each of the strip-shaped electrode plates 2 employs a bi-fold film-like separator 36 that is folded back along the edge perpendicular to the positive electrode terminal portion 21. In the laminating process substantially similar to that shown in FIG. 9, if the folds of the separator 36 are brought into contact with the long electrode plate 1 and folded, the long electrode plate 1 and Since contact with each strip-shaped electrode plate 2 can be avoided, the reliability becomes higher. Further, in the manufacturing method of this modification, the number of parts of the separator 3 is halved compared to the above embodiment, and only the opposite sides of the bi-fold separator 36 need to be welded in the strip integration step P25. There is also an advantage that the number of steps in the conversion step P25 is reduced.

(Modification 3)
In the present embodiment and the above-described modified embodiment, at least one of the long electrode plate 1 and each strip-shaped electrode plate 2 may be a two-fold structure 1A, 2A as in the third embodiment and the modified embodiment 1 Good. In that case, in addition to the operational effects of the present embodiment, the operational effects corresponding to the third embodiment and its modification 1 are obtained.

(Configuration of capacitor as power storage element and manufacturing method thereof)
The electricity storage device of the present embodiment is a capacitor 200, unlike the above embodiments and variations thereof.

  In the capacitor 200 of this embodiment, as shown in FIG. 12, the long electrode plate 201 and each strip-shaped electrode plate 202 are conductive electrode plates, and the separator 203 is an insulating film. And the manufacturing method substantially the same as the battery of Example 1 is taken except not attaching an electrode active material to the elongate electrode plate 201 and each strip-shaped electrode plate 202 at a preparatory process. That is, in the next integration process, the long electrode plate 201 and the separator 203 are combined to form the integrated long object 204, and in the final lamination process, the strip electrode plates 202 are folded on both surfaces of the integrated long object 204. Meanwhile, the integrated long object 204 is folded. As a result, a capacitor 200 having a substantially rectangular parallelepiped block shape which is an electrode laminate is manufactured.

  In the present embodiment, the long electrode plate 201 is also employed, and since there are few cutting points, there is an effect that occurrence of defects due to chips is suppressed.

(Modification 1)
Although overlapping with the above-described modification 2 of the first embodiment, as the capacitor modification 1 of the present embodiment, an electrolytic capacitor 100 having a structure constituted by the cross section shown in FIG. 1 can be implemented.

  In this modified embodiment, the advantages inherent to electrolytic capacitors are exhibited compared to ordinary capacitors having no polarity, and since one electrode plate is long and has few cutting points as in the present embodiment, the electrodes There exists an effect that generation | occurrence | production of the malfunction by the chip of a board is suppressed. Further, since the long electrode plate and the long separator are employed, there is an effect that the man-hour for cutting is reduced not only for the electrode plate but also for the separator.

(Various deformation modes)
For the capacitor 200 of the present embodiment, it is possible to carry out various modifications similar to the second and fourth embodiments and the respective modifications of the battery and the manufacturing method of the first embodiment, respectively. The corresponding effects can be obtained.

100: Lithium ion secondary battery as a storage element (simply called battery)
Or electrolytic capacitor (LIC: lithium ion capacitor)
DESCRIPTION OF SYMBOLS 1,1A: Long electrode plate (negative electrode in the example of illustration) 10, 10A: Copper foil 11: Negative electrode terminal part (as one terminal part) 12: Negative electrode active material layer / activated carbon layer 2,2A: Strip-shaped electrode plate (Positive electrode in the illustrated embodiment) 20, 20A: Aluminum foil 21: Positive electrode terminal portion (as the other terminal portion) 22: Positive electrode active material layer / activated carbon layer 3: Separator (insulating film: containing ceramic particles inside or on the surface) There is also)
30 to 32: long separator 33 to 36: strip-shaped separator 41, 42, 43: integrated long object 51, 52, 53: strip-shaped integrated object 200: capacitor as a storage element 201: long electrode plate 202: strip Electrode plate 203: long separator 204: integral long object P11, P11A: preparation process P21-P25: integration process P31, P33: lamination process

Claims (10)

One electrode plate (1, 1A, 201), the other electrode plate (2, 202), and separators (3:30 to 36, 203) inserted between these two electrode plates are alternately stacked. In the storage element (100, 200)
The one electrode plate (1, 1A, 201) is in intimate contact with the separator (3, 203) on both sides, and is a long strip that is alternately folded at predetermined intervals in the longitudinal direction and stacked in a twisted manner. An electrode plate made of a flexible material (referred to as a long electrode plate) (1, 1A, 201),
The other electrode plate (2, 202) is in close contact with the separator (3, 203) on both sides, and a plurality of independent strip-shaped electrode plates (referred to as strip-shaped electrode plates) (2, 2A, 202),
The long electrode plate (1, 1A, 201) has a terminal portion (referred to as one terminal portion) (11) protruding in one of both directions along the fold direction of the fold.
Each of the strip-shaped electrode plates (2, 2A, 202) has a terminal portion (referred to as the other terminal portion) (21) protruding to the other of the two directions.
Storage element (100, 200). The separator (3, 203)
A long separator (called a long separator) (30-32, 203) made of an insulating film and folded in contact with both surfaces of the long electrode plate (1, 1A, 201),
One piece of the long separator (2) which is folded back on the other side opposite to the protruding direction of the one terminal portion (11) and wraps part of the long electrode plate (1, 1A, 201) from both sides. (Referred to as a fold-type separator) (30, 203), and the two long separators (30, 203) sandwiching these both sides of the long electrode plate (1, 1A, 201) leaving the one terminal portion (11) ( (Referred to as sandwich type separator) (31, 32),
The electrical storage element (100) according to claim 1. The separator (3)
A strip-shaped separator (33-36) made of a strip-shaped film that wraps from both sides the portion of the strip-shaped electrode plate (2, 2A) that overlaps the long electrode plate (1, 1A, 201),
A pair of separators (33, 34) sandwiching each strip-shaped electrode plate (2, 2A) from both sides, and a double-folded shape folded back along the edge of each strip-shaped electrode plate (2, 2A) Separators (35, 36),
The electrical storage element (100) according to claim 1. The storage element (100) is either a primary battery or a secondary battery (100),
The long electrode plate (1, 1A) is one of positive and negative electrode plates having an active material layer (12) formed on both surfaces of the long electrode plate,
Each of the strip-shaped electrode plates (2, 2A) is the other of the positive and negative electrode plates having an active material layer (22) formed on both surfaces of the strip-shaped electrode plate (2, 2A).
The separator (3) is a battery separator (30-36) capable of moving charges in the thickness direction.
The electrical storage element (100) as described in any one of Claims 1-3. At least one of the long electrode plate (1A) and each of the strip-shaped electrode plates (2A) has the active material layer (12, 22) on a predetermined portion of one side of the conductive foil-like material (10A, 20A). The electrode plate (1A, 2A) has a two-fold structure in which the flexible material formed of is folded in half and has the active material layers (12, 22) on both sides.
The electrical storage element (100) according to claim 4. The storage element (100, 200) is a capacitor (100, 200),
The long electrode plates (10, 201) and the strip electrode plates (20, 202) are respectively conductive electrode plates,
The separator (30, 203) is an insulating film.
The electrical storage element as described in any one of Claims 1-3. A long electrode plate (1, 1A, 1A, which is one electrode plate having a predetermined width in one direction and long in the longitudinal direction perpendicular to the width direction (referred to as the width direction) and made of a flexible material. 201) and the strip electrode plate (2, 2A, 202) which is the other electrode plate composed of a plurality of strip electrode plates independent from each other, and has a predetermined width in the one direction and is long with respect to this width. A preparation step (P11) for preparing a long separator (30 to 32, 203) that is long in the direction and is arranged in a predetermined dimension and shape made of a flexible material;
Of the long electrode plates (1, 1A, 201), the long separators (30 to 32, 203) are connected to the long electrode plates (1) while leaving one terminal portion (11) protruding in one of the width directions. , 1A, 201) and the long separator (30-32, 203) covering the both surfaces of the long electrode plate (1, 1A, 201) and the long electrode plate (1, 1A, 201). 201) and an integrated process (P21, P22) for producing an integrated long object (41-43, 204),
The strip-shaped electrode plates (2, 2A, 202) are made to be the one-piece long, leaving the other terminal portion (21) projecting to the other in the width direction among the strip-shaped electrode plates (2, 2A, 202). The integrated long objects (41-43, 204) are alternately folded with a predetermined width in the longitudinal direction while folding one by one on both surfaces of the objects (41-43, 204). A stacking step (P31) for forming a storage element (100, 200);
It is characterized by having
Manufacturing method of electrical storage element (100, 200). The integration step (P21, P22)
The separator (30) is a single sheet, and the separator (30) is folded in two along the center line of the width along the longitudinal direction, out of the long electrode plates (1, 1A, 201) On the other hand, a two-fold integration step (P21) that encloses and covers both sides of the long electrode plate (1) leaving the terminal portion (11),
The separators (31, 32) are two, and the long electrode plates (1, 1A, 201) are left with the one terminal portion (11), and the separators (31, 32) Sandwich integration step (P22) covering and covering the electrode plates (1, 1A, 201) from both sides;
One of the
The manufacturing method of the electrical storage element (100,200) described in Claim 7. The storage element (100) is either a primary battery or a secondary battery (100),
The preparation step (P11)
An active material layer (12) is formed with a predetermined width on a part of one side of the flexible electrode material (10A) of the long electrode plate (1A) including the central part in the width direction, and this one side becomes the outside. A long electrode plate folding step (P111) for folding the conductive material (10A) in half and forming the long electrode plate (1A) having the active material layer (12) on both sides;
An active material layer (22) is formed with a predetermined width on one surface including the central portion of one surface of the flexible conductive material (20A) of each strip-shaped electrode plate (2A), and this one surface is on the outer side. Among the strip electrode plate folding step (P112) of folding the conductive material (20A) in two and forming the strip electrode plate (2A) having the active material layer (22) on both sides,
Including at least one,
The manufacturing method of the electrical storage element (100) described in one of Claims 7-8. A long electrode plate (1, 1A, 1A, which is one electrode plate having a predetermined width in one direction and long in the longitudinal direction perpendicular to the width direction (referred to as the width direction) and made of a flexible material. 201), a strip electrode plate (2, 2A, 202) which is the other electrode plate composed of a plurality of independent strip electrode plates, and each of these strip electrode plates (2, 2A, 202) A preparation step (P112) of preparing a plurality of strip separators (33 to 36) having a predetermined size and shape so as to cover both sides of
Of the strip electrode plates (2, 2A, 202), the strip separators (33 to 36) are replaced with the strip electrode plates (2, 2A, 202) leaving the terminal portion (referred to as the other terminal portion) (21). 202) and the strip-shaped separators (33 to 36) and the strip-shaped electrode plates (2, 2A, 202) covering the both surfaces of the strip-shaped electrode plates (2, 2A, 202). A strip integration step (P23, P24, P25) for producing a strip-shaped integrated product (51-53) integrated with
The strip-shaped integrated objects (51 to 53) are alternately folded one by one with respect to both surfaces of the long electrode plate (1, 1A, 201), leaving the other terminal portion (21), and the long electrodes While leaving a terminal portion (referred to as one terminal portion) (11) that does not overlap each strip-shaped electrode plate (2, 2A, 202) of the plate (1, 1A, 201), the long electrode plate (1, 1A, 201) 1A, 201) are alternately folded with a predetermined width in the longitudinal direction, and the one terminal portion (11) and each of the other terminal portions (21) project in the width direction so as to project backward from each other. A stacking step (P33) for forming a storage element (100, 200) which is a cylindrical electrode stack;
It is characterized by having
Manufacturing method of electrical storage element (100, 200).

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