All-solid-state batteries

Abstract

To provide an all-solid-state battery that can suppress filling defects in the insulating resin. [Solution] The all-solid-state battery comprises an electrode layer in which a positive electrode and a negative electrode are laminated via a solid electrolyte layer; a positive electrode protruding foil portion that constitutes the positive electrode and protrudes from the outer peripheral surface of the electrode layer; a negative electrode protruding foil portion that constitutes the negative electrode and protrudes from the outer peripheral surface; and an insulating resin portion that covers the entire outer peripheral surface of the electrode layer and covers at least a portion of the positive electrode protruding foil portion and the negative electrode protruding foil portion, wherein a positive electrode through hole is formed in the portion of the positive electrode protruding foil portion covered by the insulating resin portion, and a negative electrode through hole is formed in the portion of the negative electrode protruding foil portion covered by the insulating resin portion.

Description

Technical Field

[0004]

[0001] The present invention relates to all-solid-state batteries.

Background Art

[0002] There is known a laminated all-solid-state battery obtained by housing an all-solid-state battery laminate in an exterior body such that a positive electrode current collector tab and a negative electrode current collector tab protrude, and injecting a filler into the exterior body and curing it (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration as described in Patent Document 1, for example, since the filler flowing on one side of the positive electrode current collector tab hardly flows to the other side, there is a risk of poor filling of the filler.

[0005] An object of the present invention is to provide an all-solid-state battery capable of suppressing poor filling of an insulating resin.

Means for Solving the Problems

[0007] [Figure 1] This is a plan view of an all-solid-state battery according to the first embodiment. [Figure 2] This is a cross-sectional view of the all-solid-state battery according to the first embodiment, along the line II-II in Figure 1. [Figure 3] This is a plan view of the manufacturing apparatus according to the first embodiment. [Figure 4] This is a cross-sectional view of the manufacturing apparatus according to the first embodiment, along the line IV-IV in Figure 3. [Figure 5] (A) is a cross-sectional view showing the manufacturing space of the manufacturing apparatus according to the first embodiment, along the VA-VA line in Figure 4, as viewed from the +X direction, and (B) is a cross-sectional view showing the manufacturing space of the manufacturing apparatus according to the first embodiment, along the VB-VB line in Figure 3, as viewed from the -Y direction. [Figure 6] This is a plan view of an all-solid-state battery according to the second embodiment. [Figure 7] This is a cross-sectional view showing the manufacturing space portion of the manufacturing apparatus according to the second embodiment, as viewed from the +X direction. [Figure 8] This is a plan view of an all-solid-state battery according to the third embodiment. [Figure 9] This is a cross-sectional view of the all-solid-state battery according to the third embodiment, along the line IX-IX in Figure 8. [Figure 10] This is a cross-sectional view showing the manufacturing space portion of the manufacturing apparatus according to the third embodiment, as viewed from the +X direction. [Figure 11] This is a plan view of an all-solid-state battery according to the fourth embodiment. [Figure 12] This is a cross-sectional view showing the manufacturing space portion of the manufacturing apparatus according to the fourth embodiment, as viewed from the +X direction. [Modes for carrying out the invention]

[0008] [First Embodiment] <Configuration of a solid-state battery> A first embodiment of the present invention will now be described. The figures described below may be exaggerated to facilitate understanding of the configuration. The all-solid-state battery 1 shown in Figures 1 and 2 comprises an electrode layer 5 in which a positive electrode 2 and a negative electrode 3 are stacked via a solid electrolyte layer 4, an electrode tab 6 electrically connected to the electrode layer 5, a positioning part 7 for positioning the positive electrode 2 and the negative electrode 3, and an insulating resin part 8 that covers the entire outer surface of the electrode layer 5 and is provided so as to allow a portion of the electrode tab 6 to protrude. The number of positive electrodes 2 and negative electrodes 3 constituting the electrode layer 5 may be one, multiple, the same as each other, or different from each other. In the first embodiment, an example is given in which the electrode layer 5 is composed of four positive electrodes 2 and four negative electrodes 3.

[0009] The all-solid-state battery 1 is formed in a roughly rectangular shape when viewed from above. Hereafter, the longitudinal direction of the all-solid-state battery 1 in a plan view may be referred to as the X direction, and the transverse direction as the Y direction. The direction perpendicular to the X and Y directions, i.e., the thickness direction of the electrode layer 5, may be referred to as the Z direction. The side in the +Z direction may be referred to as the upper side, and the side in the -Z direction may be referred to as the lower side. The direction along the XY plane may be referred to as the horizontal direction.

[0010] Each positive electrode 2 comprises a positive electrode current collector foil 21 and a positive electrode active material layer 22 provided on at least one side of the positive electrode current collector foil 21. The negative electrode 3 comprises a negative electrode current collector foil 31 and a negative electrode layer 32 provided on at least one side of the negative electrode current collector foil 31. The thickness of the positive electrode current collector foil 21 and the negative electrode current collector foil 31 is preferably 5 μm to 50 μm, and more preferably 8 μm to 20 μm. The thickness of the positive electrode active material layer 22 and the negative electrode layer 32 is preferably 10 μm to 500 μm. The thickness of the solid electrolyte layer 4 is preferably 10 μm to 500 μm. The materials for the positive electrode current collector foil 21, positive electrode active material layer 22, negative electrode current collector foil 31, negative electrode layer 32, and solid electrolyte layer 4 can be materials commonly used in all-solid-state batteries. Examples of materials for the positive electrode current collector foil 21 include aluminum, and examples of materials for the positive electrode active material layer 22 include NMC (Lithium nickel manganese cobalt oxide)-based positive electrode active material. Examples of materials for the negative electrode current collector foil 31 include copper, and examples of materials for the negative electrode layer 32 include silicon and graphite. Examples of materials for the solid electrolyte layer 4 include sulfide solid electrolytes. Examples of sulfide solid electrolytes include Li2S-P2S5 systems and Li2S and lithium halides (e.g., Li2S-P2S5 systems LiCl, LiBr, LiI).

[0011] Each positive electrode current collector foil 21 comprises a positive electrode current collector portion 23 and a positive electrode protruding foil portion 24. Each negative electrode current collector foil 31 comprises a negative electrode current collector portion 33 and a negative electrode protruding foil portion 34. Each positive electrode active material layer 22, each positive electrode current collector portion 23, each negative electrode layer 32, each negative electrode current collector portion 33, and each solid electrolyte layer 4 are configured such that their outer edges overlap in a plan view. Each positive electrode protruding foil portion 24 is provided to protrude in the +X direction from the +X direction end of each positive electrode current collector portion 23. Each negative electrode protruding foil portion 34 is provided to protrude in the -X direction from the -X direction end of each negative electrode current collector portion 33. In other words, each positive electrode protruding foil portion 24 is provided to protrude from the +X direction outer circumferential surface of the electrode layer 5, and each negative electrode protruding foil portion 34 is provided to protrude from the -X direction outer circumferential surface of the electrode layer 5.

[0012] Each positive electrode protruding foil portion 24 includes a positive electrode protruding base end portion 241 extending in the +X direction from each positive electrode current collector portion 23, a positive electrode protruding intermediate portion 242 extending in an oblique direction from the positive electrode protruding base end portion 241 toward the center in the thickness direction of the electrode layer 5, and a positive electrode protruding tip portion 243 extending in the +X direction from the positive electrode protruding intermediate portion 242. One circular positive electrode through hole 25 is formed at the center of each positive electrode protruding base end portion 241 of each positive electrode protruding foil portion 24. Each negative electrode protruding foil portion 34 includes a negative electrode protruding base end portion 341 extending in the -X direction from each negative electrode current collector portion 33, a negative electrode protruding intermediate portion 342 extending in an oblique direction from the negative electrode protruding base end portion 341 toward the center in the thickness direction of the electrode layer 5, and a negative electrode protruding tip portion 343 extending in the -X direction from the negative electrode protruding intermediate portion 342. One circular negative electrode through hole 35 is formed at the center of each negative electrode protruding base end portion 341 of each negative electrode protruding foil portion 34.

[0013] Each positive electrode through hole 25 and each negative electrode through hole 35 are provided such that their centers overlap in a plan view, and are configured such that the positive electrode through holes 25 communicate with each other or the negative electrode through holes 35 communicate with each other in the Z direction. The diameter D1 of each positive electrode through hole 25 and each negative electrode through hole 35 is preferably not less than 0.3×W1 and not more than 0.8×W1, where W1 is the length in the X direction of the positive electrode protruding base end portion 241 or the negative electrode protruding base end portion 341. In addition, each positive electrode through hole 25 may be provided at a position deviated from the center of each positive electrode protruding base end portion 241, and each negative electrode through hole 35 may be provided at a position deviated from the center of each negative electrode protruding base end portion 341.

[0014] The electrode tab 6 includes a positive electrode tab 61 made of, for example, aluminum, and a negative electrode tab 62 made of, for example, nickel. The positive electrode protruding tip portions 243 of each positive electrode protruding foil portion 24 are welded to the portion on the -X direction side of the positive electrode tab 61. The negative electrode protruding tip portions 343 of each negative electrode protruding foil portion 34 are welded to the portion on the +X direction side of the negative electrode tab 62.

[0015] The positioning portion 7 includes one positive electrode positioning pin 71 inserted into each positive electrode through hole 25 and one negative electrode positioning pin 72 inserted into each negative electrode through hole 35. The positive electrode positioning pin 71 and the negative electrode positioning pin 72 have a length substantially the same as the thickness of the electrode layer 5. The cross-sectional shape orthogonal to the length direction of the positive electrode positioning pin 71 and the negative electrode positioning pin 72 is not particularly limited, and may be a perfect circle, an ellipse, or a polygon, but is smaller than the opening shape of the positive electrode through hole 25 or the negative electrode through hole 35 so that the thermoplastic resin R (see FIG. 5) before curing that constitutes the insulating resin portion 8 can flow into the gap with the positive electrode through hole 25 or the negative electrode through hole 35. The materials of the positive electrode positioning pin 71 and the negative electrode positioning pin 72 are not particularly limited and may have conductivity or may not have conductivity.

[0016] As described above, the insulating resin portion 8 is provided so as to cover the entire outer peripheral surface of the electrode layer 5, that is, so as to cover the entire outer peripheral surface on the ±X direction side and the ±Y direction side. The insulating resin portion 8 is provided so as to close the gap between each positive electrode through hole 25 and the positive electrode positioning pin 71 and the gap between each negative electrode through hole 35 and the negative electrode positioning pin 72. The insulating resin portion 8 is provided so as not to cover the positive electrode current collector portion 23 and the positive electrode protruding base end portion 241 on the +Z direction side and the negative electrode current collector portion 33 and the negative electrode protruding base end portion 341 on the -Z direction side. The insulating resin portion 8 is provided so that the positive electrode tab 61 protrudes from the end surface on the +X direction side and the negative electrode tab 62 protrudes from the end surface on the -X direction side. The insulating resin portion 8 is formed by curing the thermoplastic resin R as a curable resin. Instead of the thermoplastic resin R, a thermosetting resin, an ultraviolet curable resin, etc. may be applied as the curable resin. The insulating resin portion 8 may contain an insulating material for ensuring the strength or controlling the viscosity of the insulating resin portion 8. The insulating material contained in the insulating resin portion 8 is preferably smaller than the diameters of the positive electrode through hole 25 and the negative electrode through hole 35.

[0017] <Configuration of the manufacturing apparatus for the all-solid-state battery> The manufacturing apparatus 100 for the all-solid-state battery 1 shown in Figures 3 and 4 includes a mold 110 formed in the shape of a rectangular box. The mold 110 has a manufacturing space 111 that can accommodate the all-solid-state battery 1 inside, with parts of the positive electrode tab 61 and the negative electrode tab 62 each protruding to the outside. The mold 110 includes a lower mold 120, a side mold 130, and an upper mold 140. Note that the configuration and shape of the mold 110 are not limited to those shown in Figures 3 and 4, as long as the all-solid-state battery 1 can be manufactured using the manufacturing method described below.

[0018] The lower mold 120 is formed in a rectangular plate shape and, together with the side mold 130 and the upper mold 140, forms the manufacturing space 111.

[0019] The side mold 130 is formed in a rectangular tubular shape, with its outer edge overlapping the outer edge of the lower mold 120 in a plan view. The height of the first lower side wall portion 131 located on the +X direction side of the side mold 130 is higher than the height of the second lower side wall portion 132 located on the -X direction side. The height of the pair of lower side wall portions located on the ±Y direction sides of the side mold 130 is, for example, the same as the height of the second lower side wall portion 132. A first tab groove 133 is provided at the upper end of the first lower wall portion 131, with a length in the Y direction equal to the Y direction length of the positive electrode tab 61. A second tab groove 134 is provided at the upper end of the second lower wall portion 132, with a length in the Y direction equal to the Y direction length of the negative electrode tab 62. Air vent grooves 135 are provided at the lower ends of the first lower wall portion 131 and the second lower wall portion 132.

[0020] The upper mold 140 comprises a pressurized mold section 150 and an injection mold section 160 fixed to the pressurized mold section 150. The pressurized section 150 comprises an upper surface section 151 and an upper side section 152 provided on the lower surface of the upper surface section 151. The upper surface portion 151 is formed in the shape of a rectangular plate, with its outer edge overlapping the outer edge of the side mold 130 in a plan view. The upper portion 152 is formed in a rectangular tubular shape, with its outer and inner edges overlapping the outer and inner edges of the side mold 130 in a plan view. The height of the first upper wall portion 153 located on the +X direction side of the upper surface portion 151 is lower than the height of the second upper wall portion 154 located on the -X direction side. The height of the pair of upper wall portions located on the ±Y direction sides of the upper surface portion 151 is, for example, the same as the height of the second upper wall portion 154.

[0021] The lower mold 120, side mold 130, and upper mold 140 are fixed together such that the all-solid-state battery 1 without the insulating resin portion 8 is located in the XY center of the manufacturing space 111, the lower surfaces of the first and second upper side walls 153 and 154 of the upper mold 140 are in surface contact with the upper surfaces of the first and second lower side walls 131 and 132 of the side mold 130, and the lower surfaces of the pair of upper side walls on the ±Y side of the upper mold 140 are in surface contact with the pair of lower side walls on the ±Y side of the side mold 130. With this fixing, the electrode layer 5 is pressurized by the upper surface portion 151 and the lower mold 120, the positive electrode tab 61 is pressurized by the lower surface of the first upper side wall portion 153 and the lower surface of the first tab groove 133, and the negative electrode tab 62 is pressurized by the lower surface of the second upper side wall portion 154 and the lower surface of the second tab groove 134.

[0022] When the all-solid-state battery 1 is positioned in the center of the manufacturing space 111 in the XY direction, tab-side filling spaces 112 filled with thermoplastic resin R are formed between the side surface of the electrode layer 5 on the +X direction and the first lower side wall portion 131 of the side mold 130 and the first upper side wall portion 153 of the upper mold 140, and between the side surface of the electrode layer 5 on the -X direction and the second lower side wall portion 132 of the side mold 130 and the second upper side wall portion 154 of the upper mold 140. In addition, non-tab-side filling spaces 113 filled with thermoplastic resin R are formed between the side surface of the electrode layer 5 on the +Y direction and the upper and lower side walls of the side mold 130 and upper part 152 on the +Y direction, and between the side surface of the electrode layer 5 on the -Y direction and the upper and lower side walls of the side mold 130 and upper part 152 on the -Y direction. Hereinafter, the portions between the 1st, 2nd, and 3rd positive electrode protruding foil portions 24 from the top and the 2nd, 3rd, and 4th positive electrode protruding foil portions 24 from the top in the tab-side packing space 112 are sometimes referred to as the 1st, 2nd, and 3rd positive electrode-side spaces 112A, 112B, and 112C, and the portion between the 4th positive electrode protruding foil portion 24 from the top and the lower mold 120 is sometimes referred to as the 4th positive electrode-side space 112D. The portion between the upper surface portion 151 of the upper mold 140 and the 1st negative electrode protruding foil portion 34 from the top in the tab-side packing space 112 is sometimes referred to as the 1st negative electrode-side space 112E, and the portions between the 1st, 2nd, and 3rd negative electrode protruding foil portions 34 from the top and the 2nd, 3rd, and 4th negative electrode protruding foil portions 34 from the top are sometimes referred to as the 2nd, 3rd, and 4th negative electrode-side spaces 112F, 112G, and 112H.

[0023] The upper surface portion 151 has a positive electrode tab-side injection hole 155, a negative electrode tab-side injection hole 156, and a pair of non-tab-side injection holes 157. The positive electrode tab-side injection hole 155, the negative electrode tab-side injection hole 156, and each of the non-tab-side injection holes 157 are formed in a frustoconical shape, with the opening at the upper end being larger than the opening at the lower end. The opening diameters at the lower ends of the positive electrode tab-side injection hole 155 and the negative electrode tab-side injection hole 156 are not particularly limited, but are preferably less than or equal to the diameter of the positive electrode through-hole 25 or the negative electrode through-hole 35, respectively. The positive electrode tab-side injection hole 155 is provided such that its center coincides with the center of each positive electrode through-hole 25 in a plan view, and is configured to communicate with each positive electrode through-hole 25 in the Z direction. The negative electrode tab-side injection hole 156 is configured similarly to the positive electrode tab-side injection hole 155, and is configured to communicate with each negative electrode through-hole 35 in the Z direction. Each non-tab-side injection hole 157 is provided to communicate with the center in the X direction of each non-tab-side filling space 113.

[0024] The injection mold portion 160 is formed in the shape of a rectangular plate, with its outer edge overlapping the outer edge of the upper mold 140 in a plan view, and is fixed to the upper surface of the upper surface portion 151. In the center of the injection mold section 160, a circular main injection hole 161 is formed in plan view. The diameter of the main injection hole 161 is not particularly limited, but it is preferably larger than that of the positive electrode tab side injection hole 155. On the lower surface of the injection mold section 160, a positive electrode tab side flow groove 162 is formed, extending from the main injection hole 161 to the upper side of the positive electrode tab side injection hole 155, a negative electrode tab side flow groove 163 is formed, extending to the upper side of the negative electrode tab side injection hole 156, and a pair of non-tab side flow grooves 164 are formed, extending to the upper side of each non-tab side injection hole 157.

[0025] The manufacturing apparatus 100 further includes a filling apparatus 170 for filling the manufacturing space 111 with thermoplastic resin R.

[0026] <Manufacturing method for all-solid-state batteries> In manufacturing the all-solid-state battery 1, first, a positive electrode through-hole 25 and a negative electrode through-hole 35 are formed in the positive electrode protruding foil portion 24 of each positive electrode current collector foil 21 and in the negative electrode protruding foil portion 34 of each negative electrode current collector foil 31, respectively. Next, a positive electrode 2 is obtained by forming a positive electrode active material layer 22 on the positive electrode current collector portion 23 on at least one surface of each positive electrode current collector foil 21. After this, a solid electrolyte layer 4 is formed on the positive electrode active material layer 22 of each positive electrode 2. Furthermore, a negative electrode 3 is obtained by forming a negative electrode layer 32 on the negative electrode current collector portion 33 on at least one surface of each negative electrode current collector foil 31. The method for forming the positive electrode active material layer 22, solid electrolyte layer 4, and negative electrode layer 32 is not particularly limited, and generally used methods can be applied.

[0027] Next, positive electrode positioning pins 71 or negative electrode positioning pins 72 are inserted through each positive electrode through hole 25 and each negative electrode through hole 35 to position the positive electrode 2 and negative electrode 3 on which the solid electrolyte layer 4 is formed, and the positive electrode 2 and negative electrode 3 are stacked to form the electrode layer 5. Then, the positive electrode protruding tip 243 of each positive electrode 2 and the positive electrode tab 61 are welded, and the negative electrode protruding tip 343 of each negative electrode 3 and the negative electrode tab 62 are welded. Next, the laminate is placed in the mold 110, in which the manufacturing space 111 is not blocked by the upper mold 140, with the positive electrode tab 61 in contact with the first tab groove 133 and the negative electrode tab 62 in contact with the second tab groove 134. Next, the upper mold 140 is fixed to the lower mold 120 and the side mold 130 while applying pressure to the electrode layer 5, the positive electrode tab 61 and the negative electrode tab 62 with the upper mold 140. After this, the thermoplastic resin R is filled into the manufacturing space 111 from the filling device 170. Before filling with the thermoplastic resin R, it is preferable to create a vacuum in the manufacturing space 111 by using a suction device (not shown) to suck air from, for example, the air vent groove 135 into the manufacturing space 111.

[0028] Here, the state of filling the manufacturing space 111 with thermoplastic resin R will be explained based on Figures 5(A) and (B). Figure 5(A) shows the manufacturing space 111 as viewed from the +X direction, and Figure 5(B) shows the manufacturing space 111 as viewed from the -Y direction. As shown in Figures 5(A) and (B), the thermoplastic resin R injected from the positive electrode tab side injection hole 155 flows through the gaps between the 1st, 2nd, 3rd, and 4th positive electrode through holes 25 from the top and the positive electrode positioning pin 71 into the 1st, 2nd, 3rd, and 4th positive electrode side spaces 112A, 112B, 112C, and 112D. A portion of the thermoplastic resin R that flows into the 1st, 2nd, and 3rd positive electrode side spaces 112A, 112B, and 112C flows into the 2nd, 3rd, and 4th positive electrode side spaces 112B, 112C, and 112D as described above, and the remainder flows horizontally, including in the X and Y directions. The thermoplastic resin R that flows into the 4th positive electrode side space 112D flows horizontally.

[0029] Although not shown in the diagram, the thermoplastic resin R injected from the negative electrode tab side injection hole 156 flows into the first negative electrode side space 112E. A portion of the thermoplastic resin R that flows into the first negative electrode side space 112E flows into the second, third, and fourth negative electrode side spaces 112F, 112G, and 112H through the gaps between the first, second, and third negative electrode through holes 35 from the top and the negative electrode positioning pin 72, while the remainder flows horizontally. A portion of the thermoplastic resin R that flows into the second and third negative electrode side spaces 112F and 112G flows into the third and fourth negative electrode side spaces 112G and 112H as described above, while the remainder flows horizontally. A portion of the thermoplastic resin R that flows into the fourth negative electrode side space 112H flows into the fourth negative electrode through hole 35 from the top, while the remainder flows horizontally. Although not shown in the diagram, the thermoplastic resin R injected from each non-tab side injection hole 157 is injected into each non-tab side filling space 113.

[0030] The thermoplastic resin R injected as described above from the positive electrode tab side injection hole 155, the negative electrode tab side injection hole 156, and the non-tab side injection hole 157 fills the entire manufacturing space 111, including the gaps between each positive electrode through hole 25 and the positive electrode positioning pin 71, and the gaps between each negative electrode through hole 35 and the negative electrode positioning pin 72, while discharging the air in the manufacturing space 111 through the air vent groove 135. As the temperature of the thermoplastic resin R decreases and it hardens, the insulating resin part 8 is formed, and then the all-solid-state battery 1 is removed from the mold 110. With the above steps, the all-solid-state battery 1 is completed.

[0031] <Effects of the First Embodiment> (1) A positive electrode through hole 25 is formed in each positive electrode protruding foil portion 24 of the all-solid-state battery 1, and a negative electrode through hole 35 is formed in each negative electrode protruding foil portion 34. Here, for example, if a positive electrode through-hole 25 is not formed in the positive electrode protruding foil portion 24, the thermoplastic resin R that flows into the first positive electrode side space 112A will not flow into the second positive electrode side space 112B unless it is allowed to wrap around from the outer edge of the second positive electrode protruding foil portion 24 from the top. As a result, it becomes difficult to fill the entire second positive electrode side space 112B with thermoplastic resin R, and there is a risk of filling defects. On the other hand, in the all-solid-state battery 1 of the first embodiment, for example, the thermoplastic resin R that flows into the first positive electrode side space 112A flows into the second positive electrode side space 112B through the positive electrode through hole 25 of the second positive electrode protruding foil portion 24 from the top. As a result, it becomes easier to fill the entire positive electrode side spaces 112A to 112D and the negative electrode side spaces 112E to 112H with the thermoplastic resin R, and the occurrence of filling defects can be suppressed.

[0032] (2) The group of positive electrode protruding foil portions, each composed of a positive electrode protruding foil portion 24, and the group of negative electrode protruding foil portions, each composed of a negative electrode protruding foil portion 34, protrude in such a way that they do not overlap in the thickness direction of the electrode layer 5. The positive electrode through holes 25 and the negative electrode through holes 35 are formed to communicate with each other in the thickness direction of the electrode layer 5. Therefore, compared to a case where, for example, each positive electrode through-hole 25 is formed so that they do not communicate with each other in the thickness direction, a larger amount of thermoplastic resin R can be smoothly flowed into each positive electrode side space 112A to 112D. Consequently, it becomes easier to fill each positive electrode side space 112A to 112D and each negative electrode side space 112E to 112H with thermoplastic resin R, and the occurrence of filling defects can be further suppressed.

[0033] (3) A positive electrode positioning pin 71 or a negative electrode positioning pin 72 is inserted through each positive electrode through hole 25 and each negative electrode through hole 35. Therefore, when manufacturing the all-solid-state battery 1, the correct positioning of the positive electrode 2 and the negative electrode 3 can be easily performed, improving work efficiency.

[0034] (4) Each positive electrode through hole 25 and each negative electrode through hole 35 are formed in a circular shape. In this case, for example, if the positive electrode through-hole 25 is formed in a polygonal shape, there is a risk that the corners of the polygon may be cut off or that the thermoplastic resin R will not be filled into those corners. As in the first embodiment, by forming each positive electrode through-hole 25 and each negative electrode through-hole 35 in a circular shape, it is possible to prevent each positive electrode through-hole 25 and each negative electrode through-hole 35 from being avoided or from being filled with thermoplastic resin R.

[0035] [Second Embodiment] A second embodiment of the present invention will now be described. In the description of the second embodiment, the same names and reference numerals will be used for the same components of the all-solid-state battery and the manufacturing apparatus for the all-solid-state battery as in the first embodiment, and the description will be simplified or omitted. The same processes in the manufacturing method of the all-solid-state battery as in the first embodiment will also be simplified or omitted.

[0036] <Configuration of a solid-state battery> The all-solid-state battery 1A shown in Figure 6 differs from the positive electrode 2, negative electrode 3, and positioning unit 7 of the first embodiment in the configuration of the positive electrode 2A, negative electrode 3A, and positioning unit 7A.

[0037] Each positive electrode 2A has two positive electrode protruding foil portions 24, and each negative electrode 3A has two negative electrode protruding foil portions 34, each having two positive electrode through holes 25 or negative electrode through holes 35. The two positive electrode through holes 25 in each positive electrode protruding foil portion 24 and the two negative electrode through holes 35 in each negative electrode protruding foil portion 34 are provided at positions symmetrical with respect to the Y-direction center of the positive electrode protruding base end portion 241 or the negative electrode protruding base end portion 341. Similar to the positive electrode through holes 25 or negative electrode through holes 35 of the first embodiment, the positive electrode through holes 25 on the +Y direction side communicate with each other, the positive electrode through holes 25 on the -Y direction side communicate with each other, the negative electrode through holes 35 on the +Y direction side communicate with each other, or the negative electrode through holes 35 on the -Y direction communicate with each other, respectively, in the Z direction. Furthermore, the two positive electrode through holes 25 in each positive electrode protruding foil portion 24 may be provided at positions offset from the symmetrical position with respect to the Y-direction center of each positive electrode protruding base end portion 241, and the two negative electrode through holes 35 in each negative electrode protruding foil portion 34 may be provided in the same manner.

[0038] Each positioning section 7A is equipped with two positive electrode positioning pins 71 and two negative electrode positioning pins 72. One positive electrode positioning pin 71 and one negative electrode positioning pin 72 are inserted through the respective positive electrode through holes 25 or negative electrode through holes 35 on the +Y direction side, while the other positive electrode positioning pin 71 and one negative electrode positioning pin 72 are inserted through the respective positive electrode through holes 25 or negative electrode through holes 35 on the -Y direction side.

[0039] <Configuration of manufacturing equipment for all-solid-state batteries> Figure 7 shows the manufacturing space 111 of the manufacturing apparatus 100A for the all-solid-state battery 1A as viewed from the +X direction. The manufacturing apparatus 100A differs from the manufacturing apparatus 100 of the first embodiment in that, as shown in Figure 7, it has two positive electrode tab side injection holes 155 and two positive electrode tab side flow grooves 162 into which the thermoplastic resin R from the main injection hole 161 flows. Although not shown, the manufacturing apparatus 100A also differs from the manufacturing apparatus 100 of the first embodiment in that it has two negative electrode tab side injection holes 156 and two negative electrode tab side flow grooves 163 into which the thermoplastic resin R from the main injection hole 161 flows. Each positive electrode tab-side injection hole 155 and each negative electrode tab-side injection hole 156 are provided such that their respective centers coincide with the centers of each positive electrode through-hole 25 or each negative electrode through-hole 35 in a plan view, similar to the positive electrode tab-side injection hole 155 and each negative electrode tab-side injection hole 156 in the first embodiment, and are configured to communicate with each positive electrode through-hole 25 or each negative electrode through-hole 35 in the Z direction.

[0040] <Manufacturing method for all-solid-state batteries> In manufacturing the all-solid-state battery 1A, the thermoplastic resin R is filled into the manufacturing space 111 from the filling device 170 by performing the same process as in the first embodiment, except that two positive electrode through holes 25 or negative electrode through holes 35 are formed in each positive electrode protruding foil portion 24 and each negative electrode protruding foil portion 34, and a positive electrode positioning pin 71 or negative electrode positioning pin 72 is inserted through each positive electrode through hole 25 and each negative electrode through hole 35. Here, the state of filling the manufacturing space 111 with thermoplastic resin R will be explained based on Figure 7. As shown in Figure 7, the thermoplastic resin R injected from each positive electrode tab-side injection hole 155 flows horizontally in the first, second, third, and fourth positive electrode-side spaces 112A, 112B, 112C, and 112D, similar to the first embodiment, and fills the gaps between each positive electrode through hole 25 and the positive electrode positioning pin 71. Although not shown in the diagram, the thermoplastic resin R injected from each negative electrode tab-side injection hole 156 flows horizontally in the first, second, third, and fourth negative electrode-side spaces 112E, 112F, 112G, and 112H, as in the first embodiment, and fills the gaps between each negative electrode through hole 35 and the negative electrode positioning pin 72.

[0041] <Effects of the second embodiment> According to the second embodiment, in addition to the same effects as (2) to (4) of the first embodiment, the following effects can be achieved. (5) Each positive electrode protruding foil portion 24 of the all-solid-state battery 1A has two positive electrode through holes 25 arranged in the Y direction, and each negative electrode protruding foil portion 34 has two negative electrode through holes 35 arranged in the Y direction. Therefore, compared to the all-solid-state battery 1 of the first embodiment, it becomes easier to fill the entire positive electrode space 112A to 112D and the negative electrode space 112E to 112H with thermoplastic resin R, and the occurrence of filling defects can be further suppressed.

[0042] [Third Embodiment] A third embodiment of the present invention will now be described. In the description of the third embodiment, the same names and reference numerals will be used for the same components of the all-solid-state battery and the manufacturing apparatus for the all-solid-state battery as in the second embodiment, and the description will be simplified or omitted. The same processes in the manufacturing method of the all-solid-state battery as in the second embodiment will also be simplified or omitted.

[0043] <Configuration of a solid-state battery> The all-solid-state battery 1B shown in Figures 8 and 9 differs from the positive electrode 2A and negative electrode 3A of the second embodiment in the configuration of the positive electrode 2B and negative electrode 3B. Each positive electrode 2B has a positive electrode protruding foil portion 24 with a first positive electrode through hole 251B and a second positive electrode through hole 252B. Each negative electrode 3B has a negative electrode protruding foil portion 34 with a first negative electrode through hole 351B and a second negative electrode through hole 352B. The first and second positive electrode through holes 251B, 252B and the first and second negative electrode through holes 351B, 352B are each formed in a circular shape. The diameters of the first positive electrode through hole 251B and the first negative electrode through hole 351B are larger than the diameter of the second positive electrode through hole 252B or the second negative electrode through hole 352B. The diameters of the second positive electrode through hole 252B and the second negative electrode through hole 352B are the same as the positive electrode through hole 25 or the negative electrode through hole 35 of the second embodiment, respectively.

[0044] The first and second positive electrode through holes 251B and 252B in each positive electrode protruding foil portion 24, and the first and second negative electrode through holes 351B and 352B in each negative electrode protruding foil portion 34, are provided at positions symmetrical with respect to the Y-direction center of the positive electrode protruding base end portion 241 or the negative electrode protruding base end portion 341. The first and third positive electrode protruding foil portions 24 and each negative electrode through hole 35 from the top are provided with a first positive electrode through hole 251B or a first negative electrode through hole 351B on the +Y direction side, and a second positive electrode through hole 252B or a second negative electrode through hole 352B on the -Y direction side. A second positive electrode through-hole 252B or a second negative electrode through-hole 352B is provided on the +Y direction side of each of the second and fourth positive electrode protruding foil portions 24 and each negative electrode through-hole 35 from the top, and a first positive electrode through-hole 251B or a first negative electrode through-hole 351B is provided on the -Y direction side. Each of the first and second positive electrode through holes 251B, 252B and each of the first and second negative electrode through holes 351B, 352B are configured to communicate in the Z direction with each other, similar to the positive electrode through hole 25 or negative electrode through hole 35 of the second embodiment, with each of the first and second positive electrode through holes 251B, 252B on the +Y direction side communicating with each other, with each of the first and second positive electrode through holes 251B, 252B on the -Y direction side communicating with each other, with each of the first and second negative electrode through holes 351B, 352B on the +Y direction communicating with each other, or with each of the first and second negative electrode through holes 351B, 352B on the -Y direction communicating with each other.

[0045] <Configuration of manufacturing equipment for all-solid-state batteries> Figure 10 shows the manufacturing space 111 of the manufacturing apparatus 100B for the all-solid-state battery 1B as viewed from the +X direction. As shown in Figure 10, the manufacturing apparatus 100B differs from the manufacturing apparatus 100A of the second embodiment in that the diameter of the large-diameter injection hole 155B on the positive electrode tab side, located on the +Y direction side, is larger than that of the injection hole 155 on the positive electrode tab side of the second embodiment, and the width of the wide flow groove 162B on the positive electrode tab side, located above the large-diameter injection hole 155B on the positive electrode tab side, is wider than that of the flow groove 162 on the positive electrode tab side of the second embodiment. Although not shown in the figures, the manufacturing apparatus 100B differs from the manufacturing apparatus 100A of the second embodiment in that the diameter of the large-diameter injection hole on the negative electrode tab side, located on the +Y direction side, is larger than that of the injection hole 156 on the negative electrode tab side of the second embodiment, and the width of the wide flow groove on the negative electrode tab side, located above the large-diameter injection hole on the negative electrode tab side, is wider than that of the flow groove 163 on the negative electrode tab side of the second embodiment. The large-diameter injection hole 155B on the positive electrode tab side and the large-diameter injection hole on the negative electrode tab side are formed in a frustoconical shape, with the opening at the upper end being larger than the opening at the lower end. The diameter of the opening at the lower end of each is not particularly limited, but is preferably less than or equal to the diameter of the first positive electrode through hole 251B or the first negative electrode through hole 351B, respectively.

[0046] <Manufacturing method for all-solid-state batteries> In manufacturing the all-solid-state battery 1B, thermoplastic resin R is filled into the manufacturing space 111 from the filling device 170 by performing the same process as in the first embodiment. Here, the state of filling the manufacturing space 111 with thermoplastic resin R will be explained based on Figure 10. In Figure 10, the thickness of the arrows indicating thermoplastic resin R indicates the flow rate of thermoplastic resin R. The thicker the arrow, the greater the flow rate of thermoplastic resin R.

[0047] As shown in Figure 10, the thermoplastic resin R injected from the large-diameter injection hole 155B on the positive electrode tab side on the +Y direction side and the injection hole 155 on the positive electrode tab side on the -Y direction side flows through the first, second, third, and fourth positive electrode side spaces 112A, 112B, 112C, and 112D, similar to the second embodiment. Since the opening area of ​​the first positive electrode through hole 251B is larger than that of the second positive electrode through hole 252B, the gap between the first positive electrode through hole 251B and the positive electrode positioning pin 71 is larger than the gap between the second positive electrode through hole 252B and the positive electrode positioning pin 71. Therefore, more of the thermoplastic resin R that flows into the first, second, and third positive electrode side spaces 112A, 112B, and 112C flows into the first positive electrode through hole 251B than into the second positive electrode through hole 252B of the positive electrode protruding foil portion 24 located below each of these spaces. As a result, most of the thermoplastic resin R that flows from the first positive electrode through-hole 251B on the +Y direction side into the first and third positive electrode side spaces 112A and 112C flows in the -Y direction toward the first positive electrode through-hole 251B of the positive electrode protruding foil portion 24 located below it, and flows from the first positive electrode through-hole 251B into the second and fourth positive electrode side spaces 112B and 112D. Most of the thermoplastic resin R that flows from the first positive electrode through-hole 251B on the -Y direction side into the second positive electrode side space 112B flows in the +Y direction toward the first positive electrode through-hole 251B of the positive electrode protruding foil portion 24 located below it, and flows from the first positive electrode through-hole 251B into the third positive electrode side space 112C.

[0048] Although not shown in the diagram, the thermoplastic resin R injected from the large-diameter injection hole on the negative electrode tab side and the injection hole 156 on the negative electrode tab side flows into the first, second, third, and fourth negative electrode side spaces 112E, 112F, 112G, and 112H, similar to the second embodiment. Because the opening area of ​​the first negative electrode through-hole 351B is larger than that of the second negative electrode through-hole 352B, more of the thermoplastic resin R that flows into the second and third negative electrode side spaces 112F and 112G flows into the first negative electrode through-hole 351B than into the second negative electrode through-hole 352B of the negative electrode protruding foil portion 34 located below them. As a result, much of the thermoplastic resin R that flows from the first negative electrode through-hole 351B on the +Y side to the second negative electrode side space 112F flows in the -Y direction toward the first negative electrode through-hole 351B of the negative electrode protruding foil portion 34 located below it, and flows from the first negative electrode through-hole 351B to the third negative electrode side space 112G. Much of the thermoplastic resin R that flows from the first negative electrode through-hole 351B on the -Y side to the third negative electrode side space 112G flows in the +Y direction toward the first negative electrode through-hole 351B of the negative electrode protruding foil portion 34 located below it, and flows from the first negative electrode through-hole 351B to the fourth negative electrode side space 112H.

[0049] <Effects of the third embodiment> According to the third embodiment, in addition to the same effects as (2) to (4) of the first embodiment, the following effects can be achieved. (6) First positive electrode through holes 251B are formed on the +Y direction side of the 1st and 3rd positive electrode protruding foil portions 24 from the top of the all-solid-state battery 1B, and on the -Y direction side of the 2nd and 4th positive electrode protruding foil portions 24, respectively. Second positive electrode through holes 252B are formed on the -Y direction side of the 1st and 3rd positive electrode protruding foil portions 24, and on the +Y direction side of the 2nd and 4th positive electrode protruding foil portions 24, respectively. First negative electrode through holes 351B are formed on the +Y direction side of the 1st and 3rd negative electrode protruding foil portions 34 from the top, and on the -Y direction side of the 2nd and 4th negative electrode protruding foil portions 34, respectively. Second negative electrode through holes 352B are formed on the -Y direction side of the 1st and 3rd negative electrode protruding foil portions 34, and on the +Y direction side of the 2nd and 4th negative electrode protruding foil portions 34, respectively. Therefore, for example, a large portion of the thermoplastic resin R injected from the first positive electrode through-hole 251B on the +Y direction side into the first and third positive electrode side spaces 112A and 112C can flow into the first positive electrode through-hole 251B located on the -Y direction side of the first positive electrode through-hole 251B, rather than into the second positive electrode through-hole 252B located directly below the first positive electrode through-hole 251B. Similarly, a large portion of the thermoplastic resin R injected from the first positive electrode through-hole 251B on the -Y direction side into the second positive electrode side space 112B can flow into the first positive electrode through-hole 251B located on the +Y direction side of the first positive electrode through-hole 251B, rather than into the second positive electrode through-hole 252B located directly below the first positive electrode through-hole 251B. Therefore, compared to the all-solid-state battery 1A of the second embodiment, it becomes easier to further fill the entire positive electrode side spaces 112A to 112D and the negative electrode side spaces 112E to 112H with thermoplastic resin R, and the occurrence of filling defects can be further suppressed.

[0050] [Fourth Embodiment] A fourth embodiment of the present invention will now be described. In the description of the fourth embodiment, the same names and reference numerals will be used for the same components of the all-solid-state battery and the manufacturing apparatus for the all-solid-state battery as in the second embodiment, and the description will be simplified or omitted. The same processes in the manufacturing method of the all-solid-state battery as in the second embodiment will also be simplified or omitted.

[0051] <Configuration of a solid-state battery> The all-solid-state battery 1C shown in Figure 11 differs from the positive electrode 2A and negative electrode 3A of the second embodiment in the configuration of the positive electrode 2C and negative electrode 3C. The positive electrode 2A of the second embodiment differs from the positive electrode 2A of the second embodiment in that the positive electrode protruding foil portion 24 of each positive electrode 2C has a first positive electrode through-hole 251B of the third embodiment, which has a larger diameter than the positive electrode through-hole 25, formed in the center of the positive electrode protruding base end portion 241 in the Y direction. The negative electrode 3A of the second embodiment differs from the negative electrode 3A of the second embodiment in that the negative electrode protruding foil portion 34 of each negative electrode 3C has a first negative electrode through-hole 351B of the third embodiment, which has a larger diameter than the negative electrode through-hole 35, formed in the center of the negative electrode protruding base end portion 341 in the Y direction. Each first positive electrode through-hole 251B and each first negative electrode through-hole 351B are configured to communicate with each other in the Z direction, similar to the positive electrode through-hole 25 or the negative electrode through-hole 35. In the fourth embodiment, the first positive electrode through-hole 251B is an example of a large positive electrode through-hole, the positive electrode through-hole 25 is an example of a small positive electrode through-hole, the first negative electrode through-hole 351B is an example of a large negative electrode through-hole, and the negative electrode through-hole 35 is an example of a small negative electrode through-hole. Furthermore, each first positive electrode through-hole 251B and each first negative electrode through-hole 351B may be provided at a position offset from the center of each positive electrode protruding base end 241 or each negative electrode protruding base end 341.

[0052] <Configuration of manufacturing equipment for all-solid-state batteries> Figure 12 shows the manufacturing space 111 of the manufacturing apparatus 100C for the all-solid-state battery 1C as viewed from the +X direction. The manufacturing apparatus 100C differs from the manufacturing apparatus 100A of the second embodiment in that, as shown in Figure 12, a large-diameter injection hole 155B on the positive electrode tab side of the third embodiment and a wide flow groove 162B on the positive electrode tab side extending to the main injection hole 161 are formed above the first positive electrode through hole 251B. Although not shown, the manufacturing apparatus 100C also differs from the manufacturing apparatus 100A of the second embodiment in that a large-diameter injection hole on the negative electrode tab side of the third embodiment and a wide flow groove on the negative electrode tab side extending to the main injection hole 161 are formed above the first negative electrode through hole 351B.

[0053] <Manufacturing method for all-solid-state batteries> In manufacturing the all-solid-state battery 1C, thermoplastic resin R is filled into the manufacturing space 111 from the filling device 170 by performing the same process as in the second embodiment. Here, the state of filling the manufacturing space 111 with thermoplastic resin R will be explained based on Figure 12. In Figure 12, as in Figure 10, the thicker the arrow, the greater the flow rate of thermoplastic resin R.

[0054] As shown in Figure 12, the thermoplastic resin R injected from each positive electrode tab-side injection hole 155 flows into the first, second, third, and fourth positive electrode-side spaces 112A, 112B, 112C, and 112D, similar to the second embodiment. The thermoplastic resin R injected from the large-diameter injection hole 155B on the positive electrode tab also flows into the first, second, third, and fourth positive electrode-side spaces 112A, 112B, 112C, and 112D. Because the opening area of ​​the first positive electrode through-hole 251B is larger than that of the positive electrode through-hole 25, the thermoplastic resin R injected into the first, second, and third positive electrode-side spaces 112A, 112B, and 112C flows more towards the first positive electrode through-hole 251B than towards the positive electrode through-hole 25 of the positive electrode protruding foil portion 24 located below each of them. As a result, most of the thermoplastic resin R that flows from the first positive electrode through-hole 251B into the first, second, and third positive electrode side spaces 112A, 112B, and 112C flows in the -Z direction towards the first positive electrode through-hole 251B directly below each of them, and then flows from the first positive electrode through-hole 251B into the second, third, and fourth positive electrode side spaces 112B, 112C, and 112D.

[0055] Although not shown in the diagram, the thermoplastic resin R injected from the injection hole 156 on the negative electrode tab side flows into the first, second, third, and fourth negative electrode side spaces 112E, 112F, 112G, and 112H, similar to the second embodiment. The thermoplastic resin R injected from the large-diameter injection hole on the negative electrode tab side also flows into the first, second, third, and fourth negative electrode side spaces 112E, 112F, 112G, and 112H. Because the opening area of ​​the first negative electrode through-hole 351B is larger than that of the negative electrode through-hole 35, more of the thermoplastic resin R that flows into the second and third negative electrode side spaces 112F and 112G flows into the first negative electrode through-hole 351B than into the negative electrode through-hole 35 of the negative electrode protruding foil portion 34 located below them. As a result, most of the thermoplastic resin R that flows from the first negative electrode through-hole 351B into the second and third negative electrode side spaces 112F, 112G, and 112H flows in the -Z direction towards the first negative electrode through-hole 351B located directly below it, and then flows from the first negative electrode through-hole 351B into the third and fourth negative electrode side spaces 112G and 112H.

[0056] <Effects of the fourth embodiment> According to the fourth embodiment, in addition to the same effects as (2) to (4) of the first embodiment, the following effects can be achieved. (7) Each positive electrode protruding foil portion 24 of the all-solid-state battery 1C has two positive electrode through holes 25 and a first positive electrode through hole 251B located between the two positive electrode through holes 25. Each negative electrode through hole 35 has two negative electrode through holes 35 and a first negative electrode through hole 351B located between the two negative electrode through holes 35. A positive electrode positioning pin 71 or a negative electrode positioning pin 72 is inserted through the positive electrode through holes 25 and negative electrode through holes 35 located on the +Y side, and through the positive electrode through holes 25 and negative electrode through holes 35 located on the -Y side, respectively, while nothing is inserted through the first positive electrode through hole 251B and the first negative electrode through hole 351B. Therefore, for example, a large portion of the thermoplastic resin R injected from the first positive electrode through-hole 251B, which is not inserted through anything, into the first, second, and third positive electrode side spaces 112A, 112B, and 112C can flow into the first positive electrode through-hole 251B directly below the first positive electrode through-hole 251B. Consequently, compared to the all-solid-state battery 1A of the second embodiment, it becomes easier to further fill the entire positive electrode side spaces 112A to 112D and the negative electrode side spaces 112E to 112H with thermoplastic resin R, and the occurrence of filling defects can be further suppressed.

[0057] [Differentiation] In the first, second, and fourth embodiments, positioning sections 7, 7A, 7A are not required, and in this case, the positive electrode through-holes 25 or the negative electrode through-holes 35 do not need to be arranged to communicate with each other in the Z direction. In the third embodiment, positioning section 7A is not required for the all-solid-state battery 1B, and in this case, the first positive electrode through-hole 251B and the second positive electrode through-hole 252B on the +Y direction side, the first positive electrode through-hole 251B and the second positive electrode through-hole 252B on the -Y direction side, the first negative electrode through-hole 351B and the second negative electrode through-hole 352B on the +Y direction side, or the first negative electrode through-hole 351B and the second negative electrode through-hole 352B on the -Y direction side do not need to be arranged to communicate with each other in the Z direction. In the third embodiment, it is not necessary for each of the first positive electrode through holes 251B or each of the first negative electrode through holes 351B to be in communication in the Z direction.

[0058] In the first to fourth embodiments, the all-solid-state batteries 1, 1A, 1B, and 1C may each consist of only one positive electrode 2, 2A, 2B, and 2C, and one negative electrode 3, 3A, 3B, and 3C, respectively. In the first to fourth embodiments, the negative electrodes 3, 3A, 3B, and 3C may be configured such that the negative electrode protruding foil portion 34 protrudes in the +Y direction from, for example, the outer peripheral surface of the electrode layer 5 on the +Y direction side. In the first to fourth embodiments, the positive electrodes 2, 2A, 2B, and 2C may be configured such that the positive electrode protruding foil portion 24 protrudes in the +X direction from the +Y direction side of the outer peripheral surface of the electrode layer 5, for example, on the +X direction side, and the negative electrodes 3, 3A, 3B, and 3C may be configured such that the negative electrode protruding foil portion 34 protrudes in the +X direction from the -Y direction side of the outer peripheral surface on the +X direction side.

[0059] The shapes of the positive electrode through-hole 25, the negative electrode through-hole 35, the first and second positive electrode through-holes 251B, 252B, and the first and second negative electrode through-holes 351B, 352B may be other than a perfect circle, such as an elliptical, oblong, or polygonal shape. However, in the case of a polygonal shape, there is a risk that the positive electrode protruding base end 241 or the negative electrode protruding base end 341 may split from the corners of the polygon, so it is preferable that the shape does not have corners. For example, in the first embodiment, when an elliptical or oblong shape is applied as the shape of the positive electrode through-hole 25, it is preferable that the longitudinal direction of the positive electrode through-hole 25 is parallel to the direction in which the current flows, i.e., the +X direction, from the viewpoint of suppressing obstruction of current flow by the positive electrode through-hole 25.

[0060] In the first to fourth embodiments, the all-solid-state batteries 1, 1A, 1B, and 1C may be configured such that the electrode tabs 6 are not provided, and the tips of the positive electrode protruding foil portion 24 and the negative electrode protruding foil portion 34 protrude from the insulating resin portion 8. In the first to fourth embodiments, when manufacturing the all-solid-state batteries 1, 1A, 1B, and 1C, the thermoplastic resin R may be injected along the Y direction from the lower side wall portion located on the +Y direction side or the -Y direction side of the side mold 130, or from the upper side wall portion located on the +Y direction side or the -Y direction side of the pressurized mold portion 150. [Explanation of symbols]

[0061] 1,1A,1B,1C...All-solid-state battery, 2,2A,2B,2C...Positive electrode, 3,3A,3B,3C...Negative electrode, 4...Solid electrolyte layer, 5...Electrode layer, 7,7A...Positioning part, 8...Insulating resin part, 24...Positive electrode protruding foil part, 25...Positive electrode through hole, 34...Negative electrode protruding foil part, 35...Negative electrode through hole, 71...Positive electrode positioning pin, 72...Negative electrode positioning pin, 251B...First positive electrode through hole, 252B...Second positive electrode through hole, 351B...First negative electrode through hole, 352B...Second negative electrode through hole.

Claims

1. An electrode layer in which the positive electrode and negative electrode are stacked via a solid electrolyte layer, The positive electrode comprises a positive electrode protruding foil portion that protrudes from the outer peripheral surface of the electrode layer, The negative electrode comprises a negative electrode protruding foil portion that protrudes from the outer peripheral surface, The device comprises an insulating resin portion that covers the entire outer surface of the electrode layer and covers at least a portion of the positive electrode protruding foil portion and the negative electrode protruding foil portion, A positive electrode through-hole is formed in the portion of the positive electrode protruding foil portion that is covered with the insulating resin portion. A solid-state battery in which a negative electrode through-hole is formed in the portion of the negative electrode protruding foil portion that is covered with the insulating resin portion.

2. In the all-solid-state battery described in claim 1, The electrode layer comprises a plurality of positive electrodes and negative electrodes alternately stacked via the solid electrolyte layer, The group of positive electrode protruding foil portions, each of which is composed of the positive electrode protruding foil portion, and the group of negative electrode protruding foil portions, each of which is composed of the negative electrode protruding foil portion, protrude so as not to overlap in the thickness direction of the electrode layer. A solid-state battery in which each of the positive electrode through holes and each of the negative electrode through holes are formed to communicate with each other in the thickness direction.

3. In the all-solid-state battery according to claim 2, Each of the positive electrode protruding foil portions has a pair of positive electrode through holes formed therein. Each of the negative electrode protruding foil portions has a pair of negative electrode through holes formed therein. All-solid-state battery, wherein the positive electrode through holes on one side, the positive electrode through holes on the other side, the negative electrode through holes on one side, and the negative electrode through holes on the other side are each formed to communicate in the thickness direction.

4. In the all-solid-state battery described in claim 3, The one positive electrode through-hole located at an odd number of positions from one side in the thickness direction, and the other positive electrode through-hole located at an even number of positions, are the first positive electrode through-holes. The other positive electrode through-hole located in the odd-numbered position, and the one positive electrode through-hole located in the even-numbered position, are second positive electrode through-holes having an opening area different from that of the first positive electrode through-hole. The odd-numbered negative electrode through-hole and the even-numbered negative electrode through-hole are the first negative electrode through-holes. A solid-state battery in which the odd-numbered negative electrode through-hole and the even-numbered negative electrode through-hole are second negative electrode through-holes having an opening area different from that of the first negative electrode through-hole.

5. In the all-solid-state battery according to any one of claims 2 to 4, A positive electrode positioning pin is inserted through each of the positive electrode through holes that communicate in the thickness direction, The system further comprises negative electrode positioning pins inserted through each of the negative electrode through holes that communicate in the thickness direction, A solid-state battery in which the positive electrode positioning pin and the negative electrode positioning pin are formed in such a shape that there is a gap between them and each of the positive electrode through holes or each of the negative electrode through holes.

6. In the all-solid-state battery described in claim 3, One of the positive electrode through holes is a large positive electrode through hole. The other positive electrode through-hole is a small positive electrode through-hole with an opening area smaller than that of the large positive electrode through-hole. The aforementioned one negative electrode through-hole is a large negative electrode through-hole, The other negative electrode through-hole is a small negative electrode through-hole with an opening area smaller than that of the large negative electrode through-hole. A positive electrode positioning pin is inserted through each of the small positive electrode through holes that communicate in the thickness direction, The system further comprises negative electrode positioning pins inserted through each of the small negative electrode through-holes that communicate in the thickness direction, A solid-state battery in which the positive electrode positioning pin and the negative electrode positioning pin are formed in such a way that a gap is created between them and each of the small positive electrode through holes or each of the small negative electrode through holes.

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