Method for manufacturing all-solid-state battery, and battery manufacturing device

Abstract

According to the present invention, an electrode body is held in an appropriate position with respect to a current collector even after positioning has been released. This method for manufacturing an all-solid-state battery includes: a lamination step in which an electrode body (3) and a current collector (4) having a plurality of through-holes (4a) disposed so as to surround an opening (42a) are alternately laminated onto a mounting surface (63a) of a mounting table (63), the lamination step including a first disposition step in which the current collector 4 is disposed such that each of a plurality of positioning members (64) that are in contact with the opening (42a) and that extend in a direction perpendicular to the mounting surface (63a) in positions matching each of the plurality of through-holes (4a) pass respectively through the corresponding plurality of through holes (4a), and a second disposition step in which the electrode body (3) is disposed in the opening (42a) of the current collector (4) so as to run alongside the plurality of positioning members (64), the first disposition step and the second disposition step being repeated a plurality of times; a fixing step in which the laminated state of the laminated electrode bodies (3) and current collectors (4) is fixed; and a removal step in which the positioning members (64) are removed from the through-holes (4a).

Description

All-solid-state battery manufacturing method and battery manufacturing device

[0001] The present invention relates to a method for producing an all-solid-state battery.

[0002] To increase the capacity of an all-solid-state battery including a solid electrolyte layer, multiple electrode assemblies (single battery units) each having a stack of a positive electrode layer, a solid electrolyte layer, and a negative electrode layer may be stacked in parallel. In such a stacked structure, a current collector is disposed between two adjacent electrode assemblies so as to contact the electrode layers of these electrode assemblies. Therefore, in the manufacture of an all-solid-state battery, electrode assemblies and current collectors are alternately stacked.

[0003] In addition, an insulating member may be provided on the outer periphery of the current collector to protect the ends of the electrode body and prevent short circuits between the electrode body and other electrode bodies. To stack the electrode body on such a current collector, the electrode body is placed inside an opening in the insulating member.

[0004] Because the insulating member has a thickness approximately equal to that of the electrode body, if the electrode body is formed flat, it will fit properly within the opening of the insulating member. However, if the electrode body is deformed, such as warped, it will partially float above the current collector and will not fit properly within the opening of the insulating member. Therefore, if a deformed electrode body is placed within the opening of the insulating member and a current collector is placed on top of it, the electrode body will likely become misaligned relative to the current collector. From this perspective, it is necessary to position the electrode body on the current collector.

[0005] Regarding positioning, for example, Patent Document 1 describes that the positive electrode plate or the negative electrode plate is positioned in the vertical and horizontal directions relative to the separator by stacking the positive electrode plate or the negative electrode plate on the separator so that its periphery contacts the pin, and then the pin is removed.

[0006] Japanese Patent Application Publication No. 2001-102050

[0007] However, Patent Document 1 does not describe the positioning of the electrode body relative to the current collector. Furthermore, even if such a positioning method is applied to the positioning of the electrode body relative to the current collector, the pin is removed after positioning, so there is a possibility that the position of the electrode body relative to the current collector may be shifted.

[0008] An object of one aspect of the present invention is to maintain an electrode assembly in an appropriate position relative to a current collector even after the positioning has been released.

[0009] In order to solve the above-described problems, a method for manufacturing an all-solid-state battery according to one aspect of the present invention includes: a lamination step of alternately laminating, on a mounting surface of a mounting stand, electrode assemblies each including two electrode layers having opposite polarities and a solid electrolyte layer interposed between the two electrode layers; and current collectors each having an insulating member with openings formed therein and having a plurality of through holes formed therein and arranged to surround the openings, the lamination step including a first arranging step of arranging the current collectors such that a plurality of positioning members are provided on the mounting surface at positions corresponding to each of the plurality of through holes so as to pass through each of the corresponding through holes; and a second arranging step of arranging the electrode assemblies in the openings of the current collectors so as to be aligned with the plurality of positioning members; a fixing step of fixing the stacked state of the electrode assemblies and the current collectors after the lamination step; and a removal step of removing the plurality of positioning members from the plurality of through holes after the fixing step.

[0010] In order to solve the above-mentioned problems, a battery manufacturing apparatus according to one aspect of the present invention is a battery manufacturing apparatus for manufacturing all-solid-state batteries in which electrode bodies each including two electrode layers having different polarities and a solid electrolyte layer interposed between the two electrode layers are alternately stacked, and current collectors each having an insulating member with an opening and having a plurality of through holes formed therein and arranged to surround the openings, the battery manufacturing apparatus comprising: a mounting table having a mounting surface on which the electrode body and the current collector are placed; and a plurality of positioning members provided on the mounting table so as to contact the openings at positions corresponding to each of the plurality of through holes and extend in a direction perpendicular to the mounting surface.

[0011] According to one aspect of the present invention, the electrode assembly can be held in an appropriate position relative to the current collector even after the positioning is released.

[0012] 10 is a plan view showing the configuration of an all-solid-state battery according to one embodiment of the present invention. FIG. 11 is a side view showing, in partial cross section, the structure of a battery unit included in the all-solid-state battery. FIG. 12 is a plan view showing the configuration of a current collector included in the battery unit. FIG. 13 is a plan view showing another configuration of the current collector. FIG. 14 is a perspective view showing the configuration of a positioning device used in the manufacture of the all-solid-state battery. FIG. 15 is a perspective view showing a stacking step in the manufacture of the all-solid-state battery. FIG. 16 is a perspective view showing a state in which a positioning member of the positioning device is stretched in a direction perpendicular to the mounting surface of the positioning device in the stacking step. FIG. 17 is a perspective view showing a fixing step in the manufacture of the all-solid-state battery. FIG. 18 is a perspective view showing a removal step in the manufacture of the all-solid-state battery. FIG. 19 is a plan view showing the configuration of a current collector according to a modified embodiment. FIG. 19 is a perspective view showing a positioning member corresponding to the current collector of FIG.

[0013] [Embodiment] Hereinafter, one embodiment of the present invention will be described in detail.

[0014] <Configuration of All-Solid-State Battery> In this embodiment, as an example of an all-solid-state battery, an all-solid-state secondary battery using a lithium ion conductive solid electrolyte, i.e., an all-solid-state lithium ion secondary battery, will be described. However, it goes without saying that the all-solid-state battery according to the present invention is not limited to an all-solid-state lithium ion secondary battery.

[0015] Fig. 1 is a plan view showing the configuration of an all-solid-state battery 101 according to this embodiment. Fig. 2 is a side view showing, in partial cross section, the structure of a battery unit 1 included in the all-solid-state battery 101. Fig. 3 is a plan view showing the configuration of a current collector 4 included in the battery unit 1. Fig. 4 is a plan view showing another configuration of the current collector 4. Fig. 2 shows a side view of the battery unit 1 as viewed from direction A in Fig. 1 .

[0016] As shown in Fig. 1, the all-solid-state battery 101 includes a battery unit 1 and a laminated exterior body 2. The battery unit 1 is enclosed in the laminated exterior body 2. As also shown in Fig. 2, the battery unit 1 includes a plurality of electrode bodies 3 and a plurality of current collectors 4. The battery unit 1 is configured by connecting a plurality of electrode bodies 3 in parallel, each of which can function as a battery on its own.

[0017] As shown in FIG. 2 , the electrode body 3 has a positive electrode layer 31 (electrode layer), a negative electrode layer 32 (electrode layer), and a solid electrolyte layer 33. The positive electrode layer 31 is an electrode layer having a positive polarity. The negative electrode layer 32 is an electrode layer having a polarity opposite to that of the positive electrode layer 31, i.e., a negative polarity. Thus, the positive electrode layer 31 and the negative electrode layer 32 have opposite polarities. The solid electrolyte layer 33 is a layer formed of a solid electrolyte and is interposed between the positive electrode layer 31 and the negative electrode layer 32. The electrode bodies 3 are stacked such that the positive electrode layers 31 and the negative electrode layers 32 of each electrode body 3 face each other. The planar shape of the electrode body 3 is square (e.g., rectangular).

[0018] 2 has six stacked electrode bodies 3. In this stacked structure, the electrode bodies 3 arranged in the first (lowest), third, and fifth stages, i.e., odd-numbered stages, have the positive electrode layer 31 arranged on the lower side and the negative electrode layer 32 arranged on the upper side. On the other hand, the electrode bodies 3 arranged in the second, fourth, and sixth stages (topmost stages), i.e., even-numbered stages, have the positive electrode layer 31 arranged on the upper side and the negative electrode layer 32 arranged on the lower side.

[0019] The arrangement of the positive electrode layer 31 and the negative electrode layer 32 in each electrode body 3 is not limited to the above example, and may be the opposite of the above example. Also, the number of electrode bodies 3 in the battery unit 1 is one example, and any other number of electrode bodies 3 may be stacked as long as it is plural.

[0020] The positive electrode layer 31 is formed of a composite (mixture) of a positive electrode active material and a solid electrolyte, or of the positive electrode active material alone. The positive electrode active material may be a material commonly used for positive electrode active materials in the field of all-solid-state batteries. Examples of the positive electrode active material include lithium-containing oxides (e.g., lithium cobalt oxide (LiCoO), lithium nickel oxide (LiNiO), and lithium manganese oxide (LiMnO, etc.)).

[0021] The negative electrode layer 32 is formed of a composite (mixture) of a negative electrode active material and a solid electrolyte, or of only the negative electrode active material. The negative electrode active material may be any material commonly used in the field of all-solid-state batteries. Examples of the negative electrode active material include graphite (natural graphite, artificial graphite, etc.), carbon materials (graphite carbon fiber, resin-baked carbon, etc.), tin, lithium, oxides, sulfides, nitrides, alloys, etc., regardless of the form of powder, foil, etc.

[0022] The solid electrolytes used in the positive electrode layer 31, the negative electrode layer 32, and the solid electrolyte layer 33 are materials that are commonly used in the field of lithium ion batteries. Examples of such solid electrolytes include organic compounds, inorganic compounds, and materials made of both organic and inorganic compounds. Among inorganic compounds, Li ２ S-P ２ S ５ Sulfides such as these have superior ionic conductivity compared to other inorganic compounds.

[0023] As shown in FIG. 3 , the current collector 4 includes a current collector foil 41 and an insulating member 42. The current collector foil 41 is a conductive member that contacts the positive electrode layer 31 or the negative electrode layer 32 of the electrode body 3. The current collector foil 41 is formed of a metal such as aluminum, copper, or nickel. The current collector foil 41 has a square (e.g., rectangular) main body portion that is in contact with the electrode body 3. A tab 41 a for connecting to an external connection target is provided on an edge of one short side of the main body portion so as to protrude from the main body portion. The tab 41 a may be provided on an edge of one long side of the main body portion. The main body portion of the current collector foil 41 may also be formed in a square shape. In such a current collector foil 41, the tab 41 a is provided on an edge of one of the sides.

[0024] The insulating member 42 has a square (e.g., rectangular) outer shape with an area larger than that of the main body of the current collecting foil 41, and has a thickness approximately the same as that of the electrode body 3. The insulating member 42 is formed into a frame shape by providing an opening 42a. The opening 42a is an area in which the electrode body 3 is placed, and is formed in a size and shape that leaves a slight gap between the electrode body 3 and the opening 42a.

[0025] The insulating member 42 is disposed on the current collector foil 41 so as to cover the outer periphery of the main body of the current collector foil 41 and extend outward from the outer periphery. The insulating member 42 is adhered to the current collector foil 41 with double-sided tape, adhesive, or the like. The insulating member 42 is made of a resin such as PET (Poly Ethylene Terephthalate) to provide electrical insulation.

[0026] The current collector 4 configured as described above has a plurality of through holes 4a. The through holes 4a are arranged in positions adjacent to the opening 42a so as to surround the opening 42a. In the example shown in FIG. 3, two through holes 4a are arranged at intervals on the long side of the insulating member 42, and one is arranged in the center of the short side of the insulating member 42. However, the number and arrangement positions of the through holes 4a are not limited to this example. The through hole 4a is circular and is formed to penetrate the stacked current collecting foil 41 and insulating member 42.

[0027] 4, the current collector 4 may have through holes 4b instead of the through holes 4a. The through holes 4b are arranged at the same intervals as the through holes 4a so as to surround the opening 42a. The through holes 4b are formed in a partial circle so as to open to the opening 42a, and are formed so as to penetrate the overlapping current collecting foil 41 and insulating member 42.

[0028] As shown in Fig. 2, the electrode body 3 is disposed in an opening 42a in the current collecting foil 41 of the current collector 4. The current collector 4 on which the electrode body 3 is disposed constitutes a set of units. In the battery unit 1, a plurality of units are stacked.

[0029] The current collector foils 41 of the unit bodies in odd-numbered rows function as positive current collector foils 41A that contact the positive electrode layers 31 of the electrode body 3. The current collector foils 41 of the unit bodies in even-numbered rows function as negative current collector foils 41B that contact the negative electrode layers 32 of the electrode body 3. All of the positive current collector foils 41A are electrically connected to each other, and all of the negative current collector foils 41B are electrically connected to each other.

[0030] A current collector foil 41 is disposed alone on the unit disposed in the uppermost stage of the battery unit 1, in contact with the positive electrode layer 31 of the electrode body 3 of that unit. The current collector foil 41 functions as a positive electrode current collector foil 41A. As shown in FIG. 1 , the current collector foil 41 has a plurality of holes 41b formed on the outer periphery of the main body at positions that coincide with the through holes 4a of the current collector 4.

[0031] In the battery unit 1, between two units stacked one above the other, electrical insulation between these current collector foils 41 is ensured by insulating member 42 disposed between the current collector foil 41 of the lower unit and the current collector foil 41 of the upper unit. The insulating member 42 of each unit is adhered to the underside of the current collector foil 41 of the unit stacked above it with double-sided tape, adhesive, or the like. For convenience, only the cross-sectional structure of insulating member 42 is shown in Figure 2.

[0032] <Configuration of Positioning Device> FIG. 5 is a perspective view showing the configuration of the positioning device 6 used in manufacturing the all-solid-state battery 101.

[0033] 5 is an apparatus for manufacturing an all-solid-state battery 101 in which electrode bodies 3 and current collectors 4 are alternately stacked, as described below. Specifically, the positioning apparatus 6 is an apparatus for positioning the current collectors 4 so that they are disposed in fixed positions when the electrode bodies 3 and current collectors 4 are alternately stacked. The positioning apparatus 6 has a base 61, a support housing 62, a mounting table 63 (mounting table), a plurality of positioning members 64, a support plate 65, a lifting mechanism 66, and an operation knob 67.

[0034] The base 61 is a plate-like member that supports the portion above the base 61. The support housing 62 supports the mounting table 63 on the base 61 and houses an elevating mechanism 66 inside. The mounting table 63 is a plate-like member on which the electrode assembly 3 and the current collector 4 are placed, and its upper surface forms a mounting surface 63a. The electrode assembly 3 and the current collector 4 are placed on the mounting surface 63a.

[0035] The positioning member 64 is formed in a rod shape. The positioning member 64 is formed in a cylindrical shape, but may also be formed in a rectangular column shape. The through-hole 4a or 4b is formed in a shape corresponding to the shape of the positioning member 64. Furthermore, at least the surface of the positioning member 64 is electrically insulating. This electrical insulation may be sufficient as long as it is insulating enough to prevent current from flowing between the multiple electrode bodies 3 in contact with the positioning member 64. For this reason, the positioning member 64 may be formed entirely from resin, or the surface may be coated with an electrically insulating material.

[0036] 3, when the current collector 4 has through holes 4a, the positioning members 64 are arranged on the mounting table 63 at positions that correspond to the respective through holes 4a of the current collector 4 so as to contact the openings 42a. Specifically, the positioning members 64 are arranged at positions that contact the portions of the through holes 4a that are closest to the openings 42a. When arranged at these positions, the positioning members 64 are in contact with the openings 42a. Furthermore, the positioning members 64 are arranged on the mounting table 63 so as to extend in a direction perpendicular to the mounting surface 63a.

[0037] Alternatively, when the current collector 4 has through holes 4b, as shown in an enlarged view in Fig. 4, the positioning members 64 are arranged on the mounting table 63 at positions that correspond to the respective through holes 4b of the current collector 4 so as to contact the openings 42a. Specifically, the positioning members 64 are arranged at positions that contact the portions of the through holes 4b that are farthest from the openings 42a. Because the diameter of the positioning members 64 is approximately equal to the distance from the openings 42a to the portions of the through holes 4b that are farthest from the openings 42a, the positioning members 64 are in contact with the openings 42a when arranged at those positions.

[0038] On the mounting surface 63a, a plurality of positioning members 64 define an arrangement region R in which the electrode body 3 is arranged when the all-solid-state battery 101, which will be described later, is manufactured.

[0039] The support plate 65 is a plate-shaped member that supports the positioning member 64, and the positioning member 64 is fixed to it. The lifting mechanism 66 is a mechanism that raises and lowers the support plate 65. The lifting mechanism 66 raises and lowers the positioning member 64 by raising and lowering the support plate 65 so as to adjust the length of the positioning member 64 extending from the mounting surface 63a. The operation knob 67 is a knob that an operator operates to raise and lower the lifting mechanism 66. When the operation knob 67 is turned, the lifting mechanism 66 converts the rotational force generated by operating the operation knob 67 into linear motion in the up and down direction.

[0040] <Manufacturing of All-Solid-State Battery> The manufacturing (manufacturing method) of the all-solid-state battery 101 configured as above will be described. Fig. 6 is a perspective view showing a stacking step in the manufacturing of the all-solid-state battery 101. Fig. 7 is a perspective view showing a state in which the positioning member 64 of the positioning device 6 is stretched in the vertical direction of the mounting surface 63a in the stacking step. Fig. 8 is a perspective view showing a fixing step in the manufacturing of the all-solid-state battery 101. Fig. 9 is a perspective view showing a removal step in the manufacturing of the all-solid-state battery 101.

[0041] 6 , first, the current collector 4 is placed on the mounting surface 63a of the mounting table 63 (step S1, first placement step). In the first placement step, the current collector 4 is placed at positions that correspond to each of the plurality of through-holes 4a so that each of the plurality of positioning members 64 extends perpendicular to the mounting surface 63a and passes through each of the corresponding plurality of through-holes 4a. Next, the electrode body 3 is placed in the openings 42a of the current collector 4 so as to be aligned with the plurality of positioning members 64 (step S2, second placement step).

[0042] The through hole 4a may be connected to the opening 42a. As described above, the opening 42a is formed to have a size and shape that leaves a slight gap between the electrode body 3 and the through hole 4a. Therefore, the positioning member 64 may pass through the through hole 4a connected to the opening 42a and protrude toward the opening 42a as long as the gap is smaller than the above gap.

[0043] Thereafter, as in the first arrangement step, the current collector 4 is arranged on top of the electrode body 3 so that each of the positioning members 64 passes through each of the corresponding through holes 4a. Then, in the second step, the electrode body 3 is arranged in the openings 42a of the current collector 4 so that it is aligned with the positioning members 64. In this way, by repeating the first arrangement step and the second arrangement step multiple times, the current collector 4 and the electrode body 3 are alternately stacked on the mounting surface 63a (product term step).

[0044] Incidentally, the positions of the tips of the plurality of positioning members 64 tend to vary as they move away from the mounting table 63. For this reason, when the stacking process is performed manually, if the positioning members 64 are extended to a length corresponding to the specified number of stacked current collectors 4 and electrode bodies 3 from the initial stage of the stacking process, the variation in the positions of the tips of the plurality of positioning members 64 increases. This makes it difficult to pass the tips of the positioning members 64 through the through holes 4 a.

[0045] In contrast, in the portion where the current collector 4 and the electrode body 3 have already been stacked, the positioning member 64 is held by the current collector 4 by being passed through the through-hole 4a, and therefore there is almost no variation in the position of the positioning member 64. Therefore, in the stacking process, as shown in the upper side of Fig. 7, when the length of the positioning member 64 above the current collector 4 becomes short, the worker operates the operation knob 67 to adjust the length of the positioning member 64 above the mounting surface 63a so as to be long.

[0046] 7, the lengths of the positioning members 64 extending from the mounting surface 63a are adjusted so that they are longer than the height of the stack of current collectors 4 and electrode bodies 3, preferably so that they are long enough to accommodate at least one current collector 4. By repeatedly making this adjustment, it is possible to make it easier to pass the tips of the positioning members 64 through the through holes 4a with little variation in the positions of the tips of the positioning members 64.

[0047] After the current collectors 4 and electrode bodies 3 are stacked as described above and the top current collector 4 is placed, the current collector foil 41 is placed on top of the current collector 4, as shown in the upper part of Fig. 8. At this time, the current collector foil 41 is placed so that each of the positioning members 64 passes through each of the corresponding holes 41b, just as the current collector 4 was placed in the first placement step. In this way, the stacking step is completed.

[0048] Between the stacking step and the subsequent fixing step, the stacked electrode assemblies 3 and current collectors 4 may be lightly compressed. Specifically, an operator manually presses down on the stacked electrode assemblies 3 and current collectors 4 to compress them so that they do not become bulky in the layer direction.

[0049] 8 , the stacked sets of electrode assemblies 3 and current collectors 4 are fastened together with tape 7 to fix the stacked state of the electrode assemblies 3 and current collectors 4 (step S3, fixing step). In the fixing step, the adhesive surface of tape 7, which has been previously placed on mounting surface 63a so that one end thereof is in contact with the bottom surface of the first-tier current collector 4, is adhered to the side of the stacked current collectors 4, and the adhesive surface of the other end of tape 7 is adhered to the surface of the uppermost current collector foil 41.

[0050] 6 , tape 7 is placed on the mounting surface 63a in advance, and when the first current collector 4 is placed on the mounting surface 63a, one end of the tape 7 is adhered to the bottom surface of the current collector 4. Furthermore, the method of fixing the stacked electrode assemblies 3 and current collectors 4 is not limited to fastening with tape 7. As such a method, for example, the stacked electrode assemblies 3 and current collectors 4 may be fastened with a cable tie, or the outer peripheries of the stacked electrode assemblies 3 and current collectors 4 may be clamped with a fastener such as a clip.

[0051] When the fixing process is completed as described above, as shown in FIG. 9, the multiple positioning members 64 are removed from the holes 41b of the top current collector foil 41 and the multiple through holes 4a of each of the stacked current collectors 4 (step S4, removal process).

[0052] Finally, with the completed battery unit 1 housed within the laminated exterior body 2, the portion of the tab 41a exposed from the laminated exterior body 2 is welded to a lead (not shown) to seal the laminated exterior body 2. In sealing, the four sides of two laminate films placed above and below the battery unit 1 are heat-sealed. This seals the battery unit 1 within the laminated exterior body 2 with part of the tab 41a exposed.

[0053] Although the through hole 4a becomes unnecessary after the removal step, it is left as it is without being blocked, because even if the through hole 4a remains, it does not affect the insulating properties of the insulating member 42 in practice.

[0054] Effects of the Embodiment As described above, the manufacturing method of the all-solid-state battery 101 according to the present embodiment includes a stacking step, a fixing step, and a removal step. The stacking step is a step of alternately stacking the electrode bodies 3 and the current collectors 4 on the mounting surface 63a of the mounting table 63, and is a step of repeating the first and second arrangement steps multiple times. The first arrangement step is a step of arranging the current collectors 4 so that each of the positioning members 64 passes through each of the corresponding through holes 4a or 4b. The positioning members 64 are provided on the mounting table 63 at positions corresponding to each of the through holes 4a or 4b, so as to contact the openings 42a and extend in a direction perpendicular to the mounting surface 63a. The second arrangement step is a step of arranging the electrode bodies 3 in the openings 42a of the current collector 4 so that they are aligned with the positioning members 64. The fixing step is a step of fixing the stacked electrode bodies 3 and current collectors 4 in a stacked state. The removal step is a step of removing the positioning members 64 from the through holes 4a or 4b after the fixing step.

[0055] In the above method, the first arrangement step arranges the current collector 4 with the multiple positioning members 64 passing through the multiple through holes 4a or 4b arranged to surround the opening 42a. Therefore, even if the electrode body 3 is deformed, the second arrangement step regulates the position of the electrode body 3 on the current collector 4 in a direction perpendicular to the mounting surface 63a by each of the multiple positioning members 64 in contact with the opening 42a. Then, the fixing step fixes the stacked state in which the electrode body 3 is positioned relative to the current collector 4, and the removal step removes the multiple positioning members 64 from the multiple through holes 4a while the stacked state of the electrode body 3 and the current collector 4 remains fixed. This makes it less likely that the electrode body 3 will become misaligned with respect to the current collector 4.

[0056] Therefore, the electrode body 3 can be held in the correct position relative to the current collector 4 even after the positioning is released.

[0057] As a result, even if the electrode body 3 is deformed, the deformation of the electrode body can be reduced by applying pressure. Therefore, the electrode body 3 can be easily fitted into the opening 42a of the insulating member 42 properly.

[0058] In the stacking step, the length of the plurality of positioning members 64 extending from the mounting surface 63a is adjusted to be longer than the height of the current collectors 4 and electrode bodies 3 stacked together.

[0059] This makes it possible to adjust the length of the plurality of positioning members 64 above the mounting table 63 to a length that ensures at least the thickness of the current collectors 4 and electrode bodies 3 to be stacked. Therefore, compared to when the plurality of positioning members 64 are fixed to a length that corresponds to the specified number of stacked current collectors 4 and electrode bodies 3, it becomes easier to pass the positioning members 64 through the through holes 4 a or 4 b with less variation in the position of the tip of the positioning members 64.

[0060] Furthermore, at least the surfaces of the positioning members 64 may be electrically insulating, which can prevent the electrode body 3 from shorting out with the electrode body 3 above or below it via the positioning member 64.

[0061] The positioning members 64 may also be formed in a rod shape. This makes it possible to ensure a wide gap between adjacent through holes 4 a or 4 b in the current collector 4. This makes it easier to ensure an area for fixing the stacked state of the current collector 4 and the electrode body 3 in the fixing step, such as an adhesive area for the tape 7 described above.

[0062] <Modification> Fig. 10 is a plan view showing the configuration of a current collector 4A according to a modification of this embodiment. Fig. 11 is a perspective view showing a positioning member 68 corresponding to the current collector 4.

[0063] 10 , a current collector 4A according to this modification has a current collecting foil 41, similar to the current collector 4 described above. In addition, the current collector 4A has an insulating member 42A instead of the insulating member 42 of the current collector 4.

[0064] The insulating member 42A basically has the same frame-like outer shape as the insulating member 42, but has multiple through holes 4c instead of the multiple through holes 4a. The through holes 4c are arranged in positions adjacent to the opening 42a so as to surround the opening 42a. The through holes 4c are shaped like long, narrow rectangles and are formed like recesses that open into the openings 42a, and are formed so as to penetrate the overlapping current collecting foil 41 and insulating member 42A.

[0065] 10, one through hole 4c is disposed in the center of each of the long and short sides of the insulating member 42A. However, the number and positions of the through holes 4c are not limited to this example. The through holes 4c disposed on the long sides of the insulating member 42A are formed to be longer than the through holes 4c disposed on the short sides of the insulating member 42A.

[0066] On the other hand, the positioning device 6 has a plurality of positioning members 68 shown in FIG. 11 instead of the plurality of positioning members 64 to correspond to the insulating member 42A configured as described above. The positioning members 68 are formed in a plate shape. The positioning members 68 are formed so as to pass through the corresponding plurality of through-holes 4c, and their sizes and positions are determined. Furthermore, like the positioning members 64, at least the surfaces of the positioning members 68 are electrically insulating.

[0067] In this modification, the positioning member 68 is formed in a plate shape, which makes it possible to secure a wide range for positioning the electrode body 3. Therefore, the number of through holes 4c can be reduced compared to the number of through holes 4a.

[0068] In the case of a current collector 4 having many through holes 4a, if the length of the rod-shaped positioning member 64 that appears above the mounting surface 63a is long, the positioning member 64 may bend slightly. As a result, the position of the tip of the positioning member 64 differs from its position on the mounting surface 63a. Therefore, the worker needs to hold the tip of the positioning member 64 and pass it through the through holes 4a of the current collector 4 for each positioning member 64.

[0069] In contrast, according to this modification, even if the positioning member 68 is slightly bent, the number of through holes 4c is less than the number of through holes 4a, so the number of times the above-described work is performed can be reduced accordingly. Therefore, the first placement step can be easily performed manually.

[0070] [Summary] As described above, the method for manufacturing an all-solid-state battery according to the first aspect of the present invention includes: a lamination step of alternately laminating, on a mounting surface of a mounting stand, electrode bodies each including two electrode layers having opposite polarities and a solid electrolyte layer interposed between the two electrode layers; a current collector having an insulating member with openings formed therein and having a plurality of through holes formed therein and arranged to surround the openings; and a first arranging step of arranging the current collector so that a plurality of positioning members are provided on the mounting surface at positions that coincide with each of the plurality of through holes, the positioning members being in contact with the openings and extending in a direction perpendicular to the mounting surface, and a second arranging step of arranging the electrode bodies in the openings of the current collector so as to be aligned with the plurality of positioning members; a fixing step of fixing the stacked state of the electrode bodies and the current collectors after the lamination step; and a removal step of removing the plurality of positioning members from the plurality of through holes after the fixing step.

[0071] In the above method, even if the electrode body is deformed, the position of the electrode body on the current collector in a direction perpendicular to the mounting surface is regulated by each of the positioning members passing through each of the through holes arranged in contact with the opening. Then, the stacked state in which the electrode body is positioned relative to the current collector is fixed in the fixing step, and the multiple positioning members are removed from the multiple through holes in the removal step while the stacked state of the electrode body and the current collector remains fixed. This makes it difficult for the electrode body to become misaligned with respect to the current collector.

[0072] In the method for manufacturing an all-solid-state battery according to Aspect 2 of the present invention, in the above-described Aspect 1, in the stacking step, a length of the plurality of positioning members extending from the placement surface may be adjusted to be longer than a height at which the current collector and the electrode body are stacked.

[0073] The positions of the tips of the positioning members tend to vary as they move away from the mounting table. Therefore, when the stacking process is performed manually, if the length of the positioning members is set to a length corresponding to the specified number of stacked current collectors and electrode assemblies from the initial stage of the stacking process, the variation in the positions of the tips of the positioning members increases, making it difficult to pass the tips of the positioning members through the through holes.

[0074] In contrast, with the above method, in the portion where the current collectors and electrode assemblies have already been stacked, the positioning members are held by the current collectors by passing them through the through holes, so there is almost no variation in the position of the positioning members. Therefore, by adjusting the length of the multiple positioning members above the mounting base so that it is at least long enough to ensure the thickness of the current collectors and electrode assemblies to be stacked, it is easy to pass the positioning members through the through holes with little variation in the position of the tips of the positioning members.

[0075] In the method for producing an all-solid-state battery according to Aspect 3 of the present invention, in the above-described Aspect 1 or 2, at least surfaces of the plurality of positioning members may be electrically insulating.

[0076] According to the above method, it is possible to prevent an electrode body from shorting out with an electrode body in an upper or lower layer via the positioning member.

[0077] In the method for producing an all-solid-state battery according to Aspect 4 of the present invention, in Aspect 1 or 2, the plurality of positioning members may be formed in a rod shape.

[0078] According to the above method, it is possible to ensure a wide gap between the positioning members, which makes it easier to ensure an area for fixing the stacked state of the current collector and the electrode assembly in the fixing step.

[0079] In the method for producing an all-solid-state battery according to Aspect 5 of the present invention, in Aspect 1 or 2, the plurality of positioning members may be formed in a plate shape.

[0080] According to the above method, a wide range can be secured for positioning the electrode body, thereby reducing the number of through holes and facilitating the first manual placement step.

[0081] A battery manufacturing apparatus according to a sixth aspect of the present invention is a battery manufacturing apparatus for manufacturing all-solid-state batteries in which electrode bodies each including two electrode layers having different polarities and a solid electrolyte layer interposed between the two electrode layers are alternately stacked, and current collectors each having an insulating member with an opening and formed with a plurality of through holes arranged so as to surround the openings, the battery manufacturing apparatus comprising: a mounting table having a mounting surface on which the electrode bodies and the current collectors are placed; and a plurality of positioning members provided on the mounting table so as to contact the openings at positions corresponding to each of the plurality of through holes and extend in a direction perpendicular to the mounting surface.

[0082] In the above configuration, as in the manufacturing method of Aspect 1, the current collector and electrode body are placed on the mounting surface of the mounting table of the battery manufacturing apparatus. As a result, even if the electrode body is deformed, the position of the electrode body on the current collector in the direction perpendicular to the mounting surface is regulated by each of the multiple positioning members passing through each of the multiple through holes arranged in positions adjacent to the openings. Therefore, it is possible to make it less likely that the electrode body will be misaligned with respect to the current collector.

[0083] The battery manufacturing apparatus of aspect 7 of the present invention, in the above-mentioned aspect 6, may further include a lifting mechanism that raises and lowers the multiple positioning members so as to adjust the length of the multiple positioning members extending from the placement surface.

[0084] In the above configuration, by adjusting the lengths of the positioning members above the mounting base as in the second aspect, the positioning members can be easily passed through the through holes with little variation in the tip positions of the positioning members.

[0085] In the battery manufacturing apparatus according to Aspect 8 of the present invention, in the above-described Aspects 6 or 7, at least the surfaces of the plurality of positioning members may be electrically insulating.

[0086] This makes it possible to prevent the electrode body from shorting out with the electrode body above or below it via the positioning member, as in the case of the third aspect above.

[0087] A battery manufacturing apparatus according to a ninth aspect of the present invention is the battery manufacturing apparatus according to the sixth or seventh aspect, wherein the plurality of positioning members are formed in a rod shape.

[0088] This makes it possible to ensure a wide gap between the plurality of positioning members, as in the above-described embodiment 4. This makes it easier to ensure an area for fixing the stacked state of the stacked current collectors and electrode assemblies.

[0089] A battery manufacturing apparatus according to a tenth aspect of the present invention is the battery manufacturing apparatus according to the sixth or seventh aspect, wherein the plurality of positioning members are formed in a plate shape.

[0090] In the above configuration, a wide range for positioning the electrode body can be secured, as in the above-described aspect 5. This reduces the number of through holes, and makes it easier to perform the first manual placement step.

[0091] [Notes] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Furthermore, configurations obtained by appropriately combining the technical means disclosed in the respective embodiments are also included in the technical scope of the present invention.

[0092] 3 Electrode body 4, 4A Current collector 4a to 4c Through hole 6 Positioning device (battery manufacturing device) 31 Positive electrode layer (electrode layer) 32 Negative electrode layer (electrode layer) 33 Solid electrolyte layer 42, 42A Insulating member 42a Opening 63 Placement table (placement stand) 64, 68 Positioning member 63a Placement surface 66 Lifting mechanism 101 All-solid-state battery S1 Step (first placement step) S2 Step (second placement step) S3 Step (fixing step) S4 Step (removal step)

Claims

1. A method for manufacturing an all-solid-state battery, comprising: a lamination process for alternately laminating, on a mounting surface of a mounting stand, electrode bodies each including two electrode layers having opposite polarities and a solid electrolyte layer interposed between the two electrode layers; and current collectors each having an insulating member with openings formed therein, the current collectors having a plurality of through holes formed therein and arranged to surround the openings; a first arranging process for arranging the current collectors so that a plurality of positioning members are provided on the mounting stand at positions corresponding to each of the plurality of through holes so that the positioning members contact the openings and extend in a direction perpendicular to the mounting surface, and each of the positioning members is passed through a corresponding one of the plurality of through holes; and a second arranging process for arranging the electrode bodies in the openings of the current collectors so that they are aligned with the plurality of positioning members; a fixing process for fixing the stacked state of the electrode bodies and the current collectors after the lamination process; and a removal process for removing the plurality of positioning members from the plurality of through holes after the fixing process.

2. The method for manufacturing an all-solid-state battery according to claim 1, wherein in the stacking step, the length of the plurality of positioning members extending from the placement surface is adjusted to be longer than the height of the stack of the current collectors and the electrode bodies.

3. The method for manufacturing an all-solid-state battery according to claim 1 or 2, wherein at least the surfaces of the plurality of positioning members are electrically insulating.

4. The method for manufacturing an all-solid-state battery according to claim 1 or 2, wherein the plurality of positioning members are formed in a rod shape.

5. The method for manufacturing an all-solid-state battery according to claim 1 or 2, wherein the plurality of positioning members are formed in a plate shape.

6. A battery manufacturing apparatus for manufacturing an all-solid-state battery in which an electrode body, which is a laminate of two electrode layers having mutually different polarities and a solid electrolyte layer interposed between the two electrode layers, and a current collector having an insulating member with an opening and having a plurality of through holes formed so as to surround the opening, are alternately stacked, the battery manufacturing apparatus comprising: a mounting table having a mounting surface on which the electrode body and the current collector are placed; and a plurality of positioning members provided on the mounting table so as to contact the openings at positions corresponding to each of the plurality of through holes and extend in a direction perpendicular to the mounting surface.

7. The battery manufacturing apparatus according to claim 6, further comprising an elevation mechanism for raising and lowering the positioning members so as to adjust the lengths of the positioning members extending from the mounting surface.

8. The battery manufacturing apparatus according to claim 6 or 7, wherein at least the surfaces of the plurality of positioning members are electrically insulating.

9. The battery manufacturing apparatus according to claim 6 or 7, wherein the plurality of positioning members are formed in a rod shape.

10. The battery manufacturing apparatus according to claim 6 or 7, wherein the plurality of positioning members are formed in a plate shape.

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