JP2019040766A - Stacked battery electrode structure, stacked battery, and method of manufacturing stacked battery - Google Patents

Abstract

The present invention provides a method for manufacturing a stacked battery that can prevent power generation failure of the stacked battery and increase the productivity of the stacked battery.
A method of manufacturing a stacked battery according to the present invention includes a step of forming a first fitting hole 132 in a positive electrode extension portion 122 and a step of forming a second fitting hole 133 in a negative electrode extension portion 123. The step of installing the guide portion 150 at a predetermined position, the step of fitting the first fitting hole 132 into the first fitting protrusion 162, and the electrolyte layer 104 on the surface of the positive electrode 102 installed in the guide portion 150. And a step of fitting the second fitting hole 133 into the second fitting protrusion 163.
[Selection] Figure 5

Description

  The present invention relates to an electrode structure of a stacked battery, a stacked battery, and a method for manufacturing the stacked battery.

  Lithium ion secondary batteries are characterized by higher energy density and electromotive force than lead acid batteries and nickel metal hydride batteries. For this reason, lithium ion secondary batteries are widely used as power sources for various portable devices and notebook computers that are required to be small and light. In general, in the process of manufacturing a lithium ion secondary battery, a positive electrode in which a positive electrode active material is applied to a positive electrode current collector and a negative electrode in which a negative electrode active material is applied to a negative electrode current collector are interposed via an electrolyte layer. And stack. Then, the laminated body of a positive electrode, an electrolyte layer, and a negative electrode is sealed in a case (exterior body).

  For example, Patent Document 1 includes a step of producing a positive electrode or a negative electrode by applying an active material slurry onto a current collector, drying, and then pressing, and a step of laminating the positive electrode and the negative electrode through an electrolyte layer. It is disclosed.

JP 2013-191381 A

  However, when the relative position between the positive electrode and the negative electrode is shifted in the manufacturing process of the stacked battery in which the positive electrode and the negative electrode are stacked via the electrolyte layer, there is a problem that the power generation failure of the stacked battery occurs. In addition, when a process requiring a high degree of skill is performed in order to align the positions of the positive electrode and the negative electrode, there is a problem in that the productivity of the stacked battery decreases.

  The present invention has been made in view of the above-described circumstances, and prevents the power generation failure of the stacked battery and can increase the productivity of the stacked battery, the stacked battery electrode structure, and A method for manufacturing a stacked battery is provided.

  An electrode structure of a stacked battery according to the present invention is an electrode structure of a stacked battery that can be stacked along a predetermined stacking direction by being installed in a guide portion, and the stack is formed from an electrode and a periphery of the electrode. An extending portion that extends along a surface orthogonal to the direction, and a fitting hole that can be fitted to a fitting protrusion provided in the guide portion is provided in the extending portion, and the fitting protrusion When the fitting hole is fitted, the electrode is disposed at a predetermined position when viewed from the opposite direction of the stacking direction, and cannot move.

  In the above-described configuration, if the fitting hole is fitted into the fitting projection, the electrode is arranged at a predetermined position and cannot be moved. In other words, the electrodes of the single or plural electrode structures are overlapped at a predetermined position only by fitting the fitting holes of the single or plural electrode structures into the mating protrusions, thereby preventing the displacement of the electrodes.

  A stacked battery according to the present invention is a stacked battery in which the above-described electrodes are stacked in a plurality in the stacking direction, and one of the electrodes adjacent in the stacking direction is a positive electrode, and the other of the electrodes Is a negative electrode.

  In the above-described configuration, the positive electrode and the negative electrode are satisfactorily stacked without shifting from a predetermined position.

  A manufacturing method of a stacked battery according to the present invention is a manufacturing method of a stacked battery in which a positive electrode and a negative electrode are stacked along a predetermined stacking direction using a guide portion, and the positive electrode is connected to the positive electrode from the periphery of the positive electrode. A positive electrode extending portion extending along a surface orthogonal to the stacking direction is provided, and a negative electrode extending portion extending from a peripheral edge of the negative electrode along a surface orthogonal to the stacking direction is provided on the negative electrode. A first fitted projection and a second fitted projection extending along the stacking direction, and the first fitted projection is fitted with a first fitting hole formed in the positive electrode extension portion; The positive electrode is disposed at a predetermined position when viewed from the opposite direction of the stacking direction and is made immovable, and the second fitting protrusion is a second fitting formed on the negative electrode extension. When the fitting hole is fitted, the negative electrode is arranged at the predetermined position when viewed from the opposite direction of the stacking direction. Forming the first fitting hole in the positive electrode extension, forming the second fitting hole in the negative electrode extension, and forming the first fitting hole. Fitting one of the first fitting hole and the second fitting hole to one of the mating protrusion and the second fitted protrusion; and the first fitting protrusion and the second fitted protrusion. And a step of fitting the other of the first fitting hole and the second fitting hole.

  In the above configuration, when the first fitting hole is fitted into the first fitting protrusion, the relative position of the positive electrode with respect to the guide portion is uniquely determined. Further, when the second fitting hole is fitted into the second fitting protrusion, the relative position of the negative electrode with respect to the guide portion is uniquely determined, and the positive electrode and the negative electrode overlap in a plan view. The positive electrode and the negative electrode are positioned and overlapped with reference to the guide portion, so that the positional deviation between the positive electrode and the negative electrode can be eliminated. Further, since the first fitting hole only needs to be fitted into the first fitting protrusion and the second fitting hole should be fitted into the second fitting protrusion, the skill level of the operator is unnecessary, and the operator Therefore, the positions of the positive electrode and the negative electrode can be determined easily. According to the above-described method for manufacturing a stacked battery, power generation failure of the stacked battery can be prevented, and the productivity of the stacked battery can be increased.

  Further, in the method for manufacturing a stacked battery according to the present invention, the shape of the first mating protrusion in a plan view may be circular, and the positive electrode extension portion is formed in the step of forming the first mating hole. Two or more first fitting holes may be formed. Further, the shape of the second mating projection in plan view may be circular, and in the step of forming the second mating hole, two or more second mating holes are formed in the negative electrode extension portion. May be.

  According to the above-described configuration, in the step of fitting the first fitting hole into the first fitting protrusion and the step of fitting the second fitting hole into the second fitting protrusion, the positioning accuracy of the positive electrode and the negative electrode is ensured. Can be high.

  In the method for manufacturing a stacked battery according to the present invention, the second fitting hole may be formed in a shape different from the first fitting hole in the step of forming the second fitting hole. Further, in the step of forming the second fitting hole, the second fitting hole may be formed in a number different from that of the first fitting hole.

  According to the above configuration, in the step of fitting the first fitting hole into the first fitting projection and the step of fitting the second fitting hole into the second fitting projection, the first fitting projection and the second fitting The mating protrusion can be instantly and reliably identified visually. Thus, the positive electrode and the negative electrode can be quickly installed without making a mistake in the predetermined relative positions.

  According to the electrode structure of the multilayer battery, the multilayer battery, and the method of manufacturing the multilayer battery according to the present invention, it is possible to prevent power generation failure of the multilayer battery and increase the productivity of the multilayer battery.

It is sectional drawing of the laminated battery which can be manufactured with the manufacturing method of the laminated battery which concerns on this invention. It is a perspective view of the positive electrode and positive electrode extension part of the laminated battery shown in FIG. It is a perspective view of the positive electrode and positive electrode extension part of the laminated battery shown in FIG. It is a figure for demonstrating the manufacturing method of the laminated type battery which concerns on this invention, and is a perspective view which shows the state which installed the positive electrode in the guide part and formed the electrolyte layer on the positive electrode. It is a figure for demonstrating the manufacturing method of the laminated type battery which concerns on this invention, and is a perspective view which shows the state which has arrange | positioned the negative electrode on the electrolyte layer while installing a negative electrode in a guide part. It is a figure for demonstrating the manufacturing method of the laminated battery which concerns on this invention, and is a top view of the state shown in FIG.

  Hereinafter, an embodiment of a manufacturing method of a laminated battery according to the present invention will be described with reference to the drawings. The drawings used in the following description are schematic, and the length, width, thickness ratio, and the like are not necessarily the same as the actual ones, and can be changed as appropriate.

  FIG. 1 is a cross-sectional view of the stacked battery 100 when the stacked battery 100 is cut along the thickness direction. The stacked battery 100 is an example of a stacked battery that can be manufactured by a method of manufacturing a stacked battery according to an embodiment to which the present invention is applied (hereinafter sometimes simply referred to as “manufacturing method”). Secondary battery.

  As shown in FIG. 1, a stacked battery 100 includes a plurality (n pieces in FIG. 1) of membrane electrode assembly units 105 and an electrolyte layer interposed between the membrane electrode assembly units 105 in the thickness direction. 104. The numbers in parentheses of the membrane electrode assembly unit 105 in FIG. 1 indicate the number of the membrane electrode assembly unit 105 along the D1 direction from the lower side of the stacked battery 100.

  The membrane electrode assembly unit 105 includes a positive electrode 102, a negative electrode 103, and an electrolyte layer 104 interposed between the positive electrode 102 and the negative electrode 103. A positive electrode terminal tab 107 is connected to the end of the positive electrode 102 on the outermost side of the multilayer battery 100 (the lower side in FIG. 1). A tab 108 for negative electrode terminal is connected to the end of the negative electrode 103 on the outermost side (upper side in FIG. 1) in the stacked battery 100. A plurality of membrane electrode assembly units 105 interposing the electrolyte layer 104 are packaged (exterior) by an external body 109. However, the positive terminal tab 107 and the negative terminal tab 108 protrude to the outside of the exterior body 109, and the outer periphery of the exterior body 109 is sealed in this state. The exterior body 109 is, for example, a laminated aluminum film.

  As shown in FIG. 2, the positive electrode 102 includes a plate-shaped positive electrode current collector 111 and positive electrode active material layers 112 and 112 formed on both surfaces 111 a and 111 b of the positive electrode current collector 111. The positive electrode current collector 111 is made of, for example, an aluminum foil. Examples of the positive electrode active material layer 112 include positive electrode slurry. The positive electrode slurry is prepared by dispersing a positive electrode active material, a conductive additive, and a binder serving as a binder in a solvent. In FIG. 1, the positive electrode active material layer 112 is omitted.

Examples of the positive electrode active material include a lithium metal acid compound represented by the general formula LiM _x O _y (where M is a metal, and x and y are composition ratios of the metal M and oxygen O). Specifically, examples of the lithium metalate compound include lithium cobaltate, lithium nickelate, lithium manganate, and lithium iron phosphate. As a conductive support agent, acetylene black etc. are mentioned, for example. Examples of the binder include polyvinylidene fluoride. Note that the positive electrode active material, the conductive additive, and the binder are appropriately changed and are not particularly limited to the materials exemplified above.

  On one side of the peripheral edge 102r of the positive electrode 102, a positive electrode extension 122 extending from the peripheral edge 102r is provided along a plane P1 orthogonal to the D1 direction (stacking direction) of the positive electrode 102. In the present embodiment, the positive electrode current collector 111 and the positive electrode extension 122 are made of a common aluminum foil. The positive electrode active material layer 112 is formed on both surfaces of the region of the positive electrode 102 in a plan view of the aluminum foil (that is, when viewed in the opposite direction along the direction D1). The positive electrode current collector 111 and the positive electrode extension part 122 may be formed as separate bodies, and the positive electrode extension part 122 may be connected to one side of the peripheral edge of the positive electrode current collector 111 as the positive electrode 102.

  Two first fitting holes 132, 132 are formed in the positive electrode extension portion 122. The first fitting hole 132 is formed in a circular shape in plan view.

  As shown in FIG. 3, the negative electrode 103 includes a plate-shaped negative electrode current collector 113 and negative electrode active material layers 114 and 114 formed on both surfaces 113 a and 113 b of the negative electrode current collector 113. The negative electrode current collector 113 is made of, for example, copper (Cu). Examples of the negative electrode active material layer 114 include negative electrode slurry. The negative electrode slurry is prepared by dispersing at least a negative electrode active material and a binder serving as a binder in a solvent, and further dispersing a conductive additive in the solvent as necessary. In FIG. 1, the negative electrode active material layer 114 is omitted.

  Examples of the negative electrode active material include carbon materials made of carbon powder, graphite powder, and the like, and metal oxides such as silicon oxide. As a conductive support agent, acetylene black, a carbon nanotube, etc. are mentioned, for example. Examples of the binder include polyvinylidene fluoride. Note that the negative electrode active material, the conductive additive, and the binder are appropriately changed and are not particularly limited to the materials exemplified above. The negative electrode active material layer 114 may be doped with lithium. In that case, the negative electrode active material constituting the negative electrode active material layer 114 is a carbon material.

  On one side of the peripheral edge 103r of the negative electrode 103, a negative electrode extension portion 123 extending from the peripheral edge 103r is provided along a plane P2 orthogonal to the D1 direction of the negative electrode 103. In the present embodiment, the negative electrode current collector 113 and the negative electrode extension 123 are made of common Cu. The negative electrode active material layer 114 is formed on both surfaces of the region of the negative electrode 103 in Cu in plan view. Note that the negative electrode current collector 113 and the negative electrode extension portion 123 may be formed as separate bodies, and the negative electrode extension portion 123 may be connected to one side of the periphery of the negative electrode current collector 113 as the negative electrode 103.

  Two second fitting holes 133 and 133 are formed in the negative electrode extending portion 123. The second fitting hole 133 is formed in a circular shape in plan view.

  In the electrolyte layer 104 shown in FIG. 1, for example, a gelled electrolyte solution (details not shown) applied to the surface of the positive electrode 102 and the surface of the negative electrode 103 is included in the separator (details are not shown). Yes. Examples of the electrolytic solution include a gel electrolyte solution including a nonaqueous solvent, an electrolyte salt, and a polymer matrix. The gel electrolyte solution is preferably sticky. Further, as the electrolytic solution, an electrolytic solution that is made of a polymer matrix and a non-aqueous solvent and becomes a solid electrolyte by solidifying after coating may be used.

  Examples of the polymer matrix include polyvinylidene fluoride (PVDF), hexafluoropropylene copolymer (PVDF-HFP), polyacrylonitrile, alkylene ethers such as polyethylene oxide and polypropylene oxide, polyester, polyamine, polyphosphazene, Polysiloxane etc. are mentioned.

  Examples of the non-aqueous solvent include lactone compounds such as γ-butyrolactone, lactone compounds such as γ-butyrolactone; carbonate compounds such as ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and methyl ethyl carbonate; methyl formate, methyl acetate Carboxylic acid ester compounds such as methyl propionate; ether compounds such as tetrahydrofuran and dimethoxyethane; ether compounds such as tetrahydrofuran and dimethoxyethane; nitrile compounds such as acetonitrile; sulfone compounds such as sulfolane; amide compounds such as dimethylformamide; It is done. One of these non-aqueous solvents may be used alone, or two or more of these non-aqueous solvents may be mixed and used.

  The gel electrolyte may be solidified after coating to form a solid electrolyte layer. In this case, as the gel electrolyte, for example, a nitrile compound such as acetonitrile; an ether compound such as tetrahydrofuran; an amide compound such as dimethylformamide is used. One of these gel electrolytes may be used alone, or two or more of these gel electrolytes may be mixed and used.

  Examples of the electrolyte salt include lithium salts such as lithium hexafluorophosphate, lithium perchlorate, and lithium tetrafluoroborate.

  The separator can move the electrolytic solution in the thickness direction and has electrical insulation. Examples of such a separator include a sheet-like material having a plurality of holes and a nonwoven fabric. Examples of the material for the separator include olefin-based polyethylene, polypropylene, and cellulose-based materials. For example, a nonwoven fabric made of these materials can be used for the separator.

  The positive electrode terminal tab 107 shown in FIG. 1 is joined to the end of the positive electrode 102 (or the positive electrode extension 122), and is provided so as to protrude outward from the positive electrode extension 122 in the direction along the surface P1. Yes. The positive terminal tab 107 is made of, for example, an aluminum plate.

  The negative electrode terminal tab 108 shown in FIG. 1 is joined to the end of the negative electrode extension portion 123 (or the negative electrode 103), and is provided so as to protrude outward of the negative electrode extension portion 123 in the direction along the surface P2. Yes. The negative terminal tab 108 is formed of, for example, an aluminum plate plated with nickel.

  Next, the manufacturing method of this embodiment will be described. The stacked battery 100 shown in FIG. 1 can be manufactured by the manufacturing method of the present embodiment.

  In the manufacturing method of the present embodiment, the positive electrode 102 and the negative electrode 103 are stacked using the guide portion 150 while the electrolyte layer 104 is interposed.

  As shown in FIG. 4, the guide unit 150 includes a base 152, two first fitted protrusions 162 and two second fitted protrusions 163 formed in a bar shape. The first fitted protrusion 162 and the second fitted protrusion 163 extend from the surface of the base 152 along the direction D1.

  The first mating protrusion 162 is formed when the positive electrode 102 is viewed from the direction opposite to the direction D1 when the first fitting hole 132 formed in the positive electrode extending portion 122 is fitted (in FIG. (View) It is arranged at a predetermined position so as not to move. Specifically, the planar view shape of the first fitting protrusion 162 is the same circle as the planar view shape of the first fitting hole 132. When the two first fitting holes 132 are fitted into the two first fitting protrusions 162, the positive electrode 102 is fixed at the position P, and the positive electrode 102 and the positive electrode extension portion 122 cannot move in the direction along the surface P1. It becomes impossible to rotate.

  As shown in FIG. 5, when the second fitting protrusion 163 fits the second fitting hole 133 formed in the negative electrode extending portion 123, the negative electrode 103 is viewed from the direction opposite to the D1 direction. In addition, it is arranged at a predetermined position (in plan view in FIG. 5 and the like) so that it cannot move, and the position of the negative electrode 103 is aligned with the position of the positive electrode 102 in plan view. When the two second fitting holes 133 are fitted into the two second fitted protrusions 163, the negative electrode 103 and the negative electrode extending portion 123 cannot move in the direction along the surface P2, and cannot rotate. If the two first fitting holes 132 are fitted in the first fitting protrusion 162 before the two second fitting holes 133 are fitted in the second fitting protrusion 163, the negative electrode at a predetermined position P 103 and the positive electrode 102 overlap.

The manufacturing method of this embodiment is as follows:
* Process for forming first fitting hole 132 in positive electrode extension 122 (first process)
* Step of forming second fitting hole 133 in negative electrode extension portion 123 (second step)
* Step of installing guide unit 150 at a predetermined position (third step)
* Step of fitting the first fitting hole 132 to the first fitting protrusion 162 (fourth step)
* Step of disposing the electrolyte layer 104 on the surface of the positive electrode 102 installed in the guide portion 150 (fifth step)
* Step of fitting second fitting hole 133 into second fitting protrusion 163 (sixth step)
Have Hereinafter, each process, the pre-process, and the post-process will be described.

[Preprocessing]
A positive electrode current collector 111 is prepared, and the positive electrode slurry is applied to the surface of the positive electrode current collector 111 in a region to be the positive electrode 102 to form the positive electrode active material layer 112. The positive electrode current collector 111 in a region where the positive electrode slurry is not applied is defined as a positive electrode extension portion 122. Similarly, the negative electrode current collector 113 is prepared, and the negative electrode slurry is applied to the surface of the negative electrode current collector 113 in the region to be the negative electrode 103 to form the negative electrode active material layer 114. The negative electrode current collector 113 in a region where the negative electrode slurry is not applied is defined as a negative electrode extension portion 123.

[First step]
Two first fitting holes 132 having a circular shape in plan view are formed in the positive electrode extension portion 122 in accordance with the planar view shape and relative arrangement of the two first fitting protrusions 162 in the guide portion 150. Examples of the method for forming the first fitting hole 132 include punching.

[Second step]
Two second fitting holes 133 having a circular shape in plan view are formed in the negative electrode extension portion 123 in accordance with the shape and relative arrangement of the two second fitting protrusions 163 in the guide portion 150. Examples of the method of forming the second fitting hole 133 include punching.

[Third step]
The guide unit 150 is installed at a predetermined position such as on a work table.

[Fourth process]
As shown in FIG. 4, each of the two first fitting holes 132 is fitted into each of the two first fitted protrusions 162 while the positive electrode 102 is disposed above the base 152. The positive electrode 102 is lowered so as to approach the base 152, and is installed on the base 152.

[Fifth step]
A separator is provided on the surface of the positive electrode 102 installed in the guide portion 150, and an electrolytic solution (not shown) is applied to the separator, impregnated, and the electrolyte layer 104 is disposed.

[Sixth step]
As shown in FIG. 5, each of the two second fitting holes 133 is fitted into each of the two second fitted protrusions 163 while the negative electrode 103 is disposed above the base 152. The negative electrode 103 is lowered so as to be close to the electrolyte layer 104 and installed on the base 152. By this step, as shown in FIG. 6, the negative electrode 103 and the positive electrode 102 overlap in a plan view. Through this step, the membrane electrode assembly unit 105 shown in FIG. 1 is produced.

[Post-processing]
As shown in FIG. 1, the multilayer battery 100 includes a plurality of membrane electrode assembly units 105. Therefore, after the sixth step, as the seventh step, a separator is provided on the surface of the negative electrode 103, and the separator is electrolyzed. A liquid (not shown) is applied and impregnated, and the electrolyte layer 104 is disposed. Thereafter, the fourth to seventh steps are sequentially repeated (n-1) times. The electrolyte layer 104 is not disposed on the surface of the negative electrode 103 of the nth membrane electrode assembly unit 105 (that is, the outermost membrane electrode assembly unit 105) in the D1 direction.

  After stacking the n membrane electrode assembly units 105, the n membrane electrode assembly units 105 are extracted from the guide portion 150. Subsequently, the positive electrode terminal tab 107 is connected to the outermost positive electrode 102 of the stacked battery 100, and the negative electrode terminal tab 108 is connected to the outermost negative electrode 103 of the stacked battery 100. The exterior of the plurality of membrane electrode assembly units 105 interposing the electrolyte layer 104 is temporarily sealed with an exterior body 109.

  The initial charge is performed by applying a voltage between the positive electrode 102 and the negative electrode 103, and lithium (Li) on the surface of the negative electrode active material layer 114 formed on the surface 113a side of the negative electrode current collector 113 of the negative electrode 103, The negative electrode active material constituting the negative electrode active material layer 114 formed on the surface 113b side is doped. After such a doping process, the exterior body 109 is fully sealed. The stacked battery 100 is completed through the above-described steps.

  According to the manufacturing method of the present embodiment described above, when the first fitting hole 132 is fitted to the first fitting protrusion 162 in the fourth step, the relative position of the positive electrode 102 with respect to the guide portion 150 as shown in FIG. Is uniquely determined. Further, when the second fitting hole 133 is fitted into the second fitted protrusion 163 in the sixth step, the relative position of the negative electrode 103 with respect to the guide portion 150 is uniquely determined as shown in FIG. And the negative electrode 103 overlap. Since the positive electrode 102 and the negative electrode 103 are accurately positioned and overlapped with the guide portion 150 as a reference, the positional deviation between the positive electrode 102 and the negative electrode 103 can be eliminated. Further, in order to determine the positions of the positive electrode 102 and the negative electrode 103, the first fitting hole 132 may be fitted into the first fitted protrusion 162, and the second fitting hole 133 may be fitted into the second fitted protrusion 163. The skill level of the operator is unnecessary, and the positions of the positive electrode 102 and the negative electrode 103 can be determined easily and accurately regardless of the operator. Therefore, according to the manufacturing method of the present embodiment, the power generation failure of the stacked battery 100 can be prevented, and the productivity of the stacked battery 100 can be increased.

  Moreover, in the manufacturing method of this embodiment, the planar view shape of the 1st to-be-fitted protrusion 162 is circular, In the process of forming the 1st fitting hole 132, the 1st fitting of planar view circular shape is carried out to the positive electrode extension part 122. Two joint holes 132 were formed. The shape of the second fitting protrusion 163 in plan view is also circular, and two second fitting holes 133 having a circular shape in plan view were formed in the negative electrode extension portion 123 in the step of forming the second fitting hole 133. According to the above-described configuration, the operator can easily fit the first fitting hole 132 into the first fitted protrusion 162, the second fitting hole 133 can be easily fitted into the second fitted protrusion 163, and the positive electrode 102. In addition, the positioning accuracy of the negative electrode 103 can be reliably increased.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

  For example, the planar view shape of the first fitting protrusion 162 and the first fitting hole 132 is not limited to a circle, and may be selected from a square, a star, a cross, or any other shape. When the shape of the first fitting hole 132 in a plan view is a rotationally symmetric shape around the D1 direction like a circle, two or more first fitting holes 132 are formed in the positive electrode extension portion 122. By forming two or more first mating protrusions 162 and first mating holes 132 in this way, the positive electrode 102 becomes D1 when the first mating hole 132 is fitted to the first mating protrusion 162. It becomes impossible to rotate around the direction. On the other hand, if the first mating protrusion 162 and the first mating hole 132 have a plan view shape of a star or a cross, even if only one first mating protrusion 162 and the first mating hole 132 are formed. When the first fitting hole 132 is fitted into the first fitting protrusion 162, the positive electrode 102 becomes non-rotatable around the D1 direction. Therefore, when the positive electrode 102 cannot be rotated around the D1 direction when the first fitting hole 132 is fitted to the first fitting protrusion 162, the first fitting protrusion 162 and the first fitting hole 132 are used. One may be formed in the positive electrode extension part 122.

  In the above-described embodiment, in the step of forming the second fitting hole 133 in the positive electrode extension portion 122, the second fitting hole 133 has the same planar view shape as the first fitting hole 132 (that is, a circle). Although formed, the second fitting hole 133 may be formed in a plan view shape different from that of the first fitting hole 132. For example, the plan view shape of the first fitted protrusion 162 and the first fit hole 132 may be a circle, and the plan view shape of the second fit protrusion 163 and the second fit hole 133 may be a triangle. In the above-described embodiment, in the step of forming the second fitting holes 133 in the positive electrode extension portion 122, the second fitting holes 133 are formed in the same number as the first fitting holes 132 (that is, two). However, the number of the second fitting holes 133 may be different from the number of the first fitting holes 132 (however, three or more). For example, the number of the first fitting protrusion 162 and the first fitting hole 132 may be two, and the number of the second fitting protrusion 163 and the second fitting hole 133 may be three. In this way, the first fitting hole 132 and the second fitting hole 133 are formed by changing the shape and number of the planar views of each other, so that the operator can change the first fitting protrusion 162 and the second fitting protrusion. 163 can be identified instantaneously and reliably by visual inspection. Further, without making a mistake, the first fitting hole 132 is fitted into the first fitted protrusion 162, the second fitting hole 133 is fitted into the second fitted protrusion 163, and the positive electrode 102 and the negative electrode 103 are respectively set to predetermined relative positions. Can be installed quickly at the location.

  In addition, the guide unit 150 may include only the first fitted protrusion 162 and the second fitted protrusion 163 without including the base 152. For example, the first mating protrusion 162 and the second mating protrusion 163 may be installed in an apparatus for manufacturing the positive electrode 102 and the negative electrode 103.

  The manufacturing method according to the present invention is not limited to the lithium ion secondary battery exemplified in the above-described embodiment, and can be applied to a stacked battery that can be manufactured by stacking a positive electrode and a negative electrode.

DESCRIPTION OF SYMBOLS 100 ... Stack type battery 102 ... Positive electrode 103 ... Negative electrode 122 ... Positive electrode extension part 123 ... Negative electrode extension part 132 ... First fitting hole 133 ... Second fitting hole 150 ... Guide part 162 ... First fitting protrusion 163 ... Second mating protrusion

Claims (7)

It is an electrode structure of a stacked battery that can be stacked along a predetermined stacking direction by being installed in a guide part,
Electrodes,
Extending from the periphery of the electrode along a plane orthogonal to the stacking direction,
A fitting hole that can be fitted to a fitting protrusion provided in the guide portion is provided in the extension portion,
When the fitting hole is fitted into the fitting protrusion, the electrode is arranged at a predetermined position and cannot be moved when viewed from the opposite direction of the lamination direction, and the electrode structure of the laminated battery is characterized in that . A stacked battery in which a plurality of the electrodes according to claim 1 are stacked along the stacking direction,
One of the electrodes adjacent to each other in the stacking direction is a positive electrode, and the other of the electrodes is a negative electrode. A method for manufacturing a stacked battery in which a positive electrode and a negative electrode are stacked along a predetermined stacking direction using a guide part,
The positive electrode is provided with a positive electrode extension extending from the periphery of the positive electrode along a plane orthogonal to the stacking direction,
The negative electrode is provided with a negative electrode extension that extends from the periphery of the negative electrode along a plane perpendicular to the stacking direction,
The guide portion includes a first fitted protrusion and a second fitted protrusion extending along the stacking direction,
When the first fitting protrusion is fitted in the first fitting hole formed in the positive electrode extension portion, the positive electrode is arranged at a predetermined position when viewed from the opposite direction of the stacking direction, and is immovable. Formed to
When the second fitting hole formed in the negative electrode extension portion is fitted into the second fitting protrusion, the negative electrode is arranged at the predetermined position when viewed from the opposite direction of the stacking direction and cannot move. Formed to
Forming the first fitting hole in the positive electrode extension portion;
Forming the second fitting hole in the negative electrode extension portion;
Fitting one of the first fitting hole and the second fitting hole to one of the first fitted protrusion and the second fitted protrusion; and
Fitting the other of the first fitting hole and the second fitting hole to the other of the first fitting protrusion and the second fitting protrusion;
A method for producing a laminated battery, comprising: The plan view shape of the first mating protrusion is circular,
The method for manufacturing a stacked battery according to claim 3, wherein in the step of forming the first fitting hole, two or more of the first fitting holes are formed in the positive electrode extension portion. The plan view shape of the second mating protrusion is circular,
The method for manufacturing a stacked battery according to claim 3, wherein in the step of forming the second fitting hole, two or more of the second fitting holes are formed in the negative electrode extension portion.   The said 2nd fitting hole is formed in the shape different from a said 1st fitting hole in the process of forming a said 2nd fitting hole, The Claim 1 characterized by the above-mentioned. A method for producing a laminated battery.   The said 2nd fitting hole is formed in the number different from said 1st fitting hole in the process of forming said 2nd fitting hole, The any one of Claims 3-6 characterized by the above-mentioned. A method for producing a laminated battery.

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