Solid state battery device

Abstract

To provide a solid power storage device which has been subjected to a countermeasure against internally generated gas.SOLUTION: A solid power storage device has a solid battery laminate 1 in which positive electrode systems 10 and negative electrode systems 30 are alternately laminated, and the projected shape of the solid power storage device in the lamination direction is approximately square. The positive electrode systems and the negative electrode systems are provided with a sealing frame 17 which is surrounded by four sealing members 13, 14, 15, and 16 extending along the sides of the outer circumference of the square to seal the inside. The sealing frame has a three-way sealing member 18 in which the sealing members 13, 14 and 15 on the three sides of the outer circumference are connected to one another, and a closing sealing member 19 for closing the open side. At least one of the three-way sealing member and the closing sealing member of at least one of the positive electrode system and the negative electrode system is provided with a communication portion 2 (a groove portion 3, a slit 4 and a groove-shaped portion 5) communicating with the outside.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a solid-state power storage device. [Background technology]

[0002] A solid-state electricity storage device has been proposed in which a solid electrolyte is disposed at the interface connecting the positive electrode system and the negative electrode system, and ions between the positive electrode system and the negative electrode system during charging and discharging are exchanged via this solid electrolyte (see, for example, Patent Document 1).

[0003] Meanwhile, in a solid-state power storage device in which the side surfaces of the all-solid-state battery laminate are covered with a resin layer, a technique for improving the adhesion between the all-solid-state battery laminate and the resin layer has been proposed (see, for example, Patent Document 2). In the proposal in Patent Document 2, a laminated portion as a portion overlapping with the adjacent other layer and an extending portion extending beyond the other layer are provided on at least one surface of at least one of the positive electrode current collector layer and the negative electrode current collector layer. The surface roughness of the extending portion is increased to ensure the adhesion between the all-solid-state battery laminate and the resin layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6363244 [Patent Document 2] JP 2019-192610 A Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, it has become clear that in this type of solid-state electricity storage device, gas generated by reactions inside the positive electrode system and the negative electrode system may remain inside the solid-state electricity storage device and cause destruction of the electrode structure. In the solid-state battery devices disclosed in Patent Documents 1 and 2, no technology is proposed regarding measures against the gas generated inside as described above.

[0006] The present invention has been made in consideration of the above circumstances, and has an object to provide a solid-state electricity storage device in which measures are taken against gas generated inside. [Means for solving the problem]

[0007] (1) A positive electrode system (for example, a positive electrode 10 described later) in which a positive electrode active material layer (for example, a positive electrode active material layer 11 described later) is disposed between two facing solid electrolyte layers (for example, solid electrolyte layers 20, 20 described later) and a positive electrode current collector layer (for example, a positive electrode current collector layer 12 described later) is disposed in contact with the positive electrode active material layer, and a negative electrode system (for example, a negative electrode 30 described later) in which a negative electrode active material layer (for example, a negative electrode active material layer 31 described later) is disposed and a negative electrode current collector layer (for example, a negative electrode current collector layer 32 described later) is disposed in contact with the negative electrode active material layer are alternately laminated, and a solid battery stack (for example, a solid battery stack 1 described later) has a substantially rectangular projected shape in the stacking direction, Each of the positive electrode system and the negative electrode system is provided with a sealing frame (e.g., a sealing frame 17 described later) that is surrounded by four sealing members (e.g., four sealing members 13, 14, 15, and 16 described later) extending along each side of the outer periphery of a rectangle to seal the inside, The sealing frame has a three-way sealing member (e.g., a three-way sealing member 18 described later) in which sealing members on three sides along the outer periphery are connected, and a closing sealing member (e.g., a closing sealing member 19 described later) arranged to close the open side of the three-way sealing member, At least one of the three-way sealing member and the closing sealing member in at least one of the positive electrode system and the negative electrode system is provided with a ventilation part (for example, the ventilation part 2 described later) communicating with the outside. Solid state power storage device.

[0008] (2) The solid state power storage device according to (1), wherein the ventilation portion is formed by a slit (for example, slit 4 described below) provided in the closure sealing member.

[0009] (3) The solid-state energy storage device according to (1), wherein the ventilation portion is formed in an opposing portion of at least one of the three-way sealing member and the closure sealing member where the two are in contact with each other. (4) The solid-state storage device according to (3), wherein the ventilation portion is formed in an opposing portion of at least one of the three-way sealing member and the closure sealing member of the positive electrode system where the two are in contact with each other. (5) The solid storage device according to any one of (1) to (4), wherein the ventilation portion is formed in the closure sealing member so as to extend in a direction in which at least one of the positive electrode collector layer and the negative electrode collector layer extends to the outside. (6) The solid state electricity storage device according to any one of (1) to (5), wherein an electrolyte is sealed in at least one of the positive electrode system and the negative electrode system. Effect of the Invention

[0010] In the solid-state energy storage device of (1), at least one of the three-way sealing member and the closing sealing member in at least one of the positive electrode system and the negative electrode system is provided with a vent that communicates with the outside. Gas generated inside the solid-state energy storage device escapes to the outside through this vent, thereby preventing defects such as destruction of the electrode structure.

[0011] In the solid-state electricity storage device of (2), the gas generated inside the solid-state electricity storage device can be effectively released to the outside by a simple structure in which a ventilation portion is formed by a slit provided in the closure sealing member.

[0012] In the solid-state energy storage device of (3), a ventilation portion is formed in the opposing portion where the three-way sealing member and the closure sealing member are in contact with each other in at least one of the three-way sealing member and the closure sealing member, so that gas generated inside the solid-state energy storage device can be effectively released to the outside while maintaining the strength of the three-way sealing member and the closure sealing member. In the solid-state energy storage device of (4), the ventilation portion is formed in an opposing portion of at least one of the three-way sealing member and the closure sealing member of the positive electrode system where the two are in contact with each other. Therefore, on the positive electrode system side where a relatively large amount of gas is generated, gas generated inside the solid-state energy storage device can be effectively released to the outside. In the solid-state energy storage device (5), the ventilation portion is formed in the closure sealing member so as to extend in a direction in which at least one of the positive electrode current collector layer and the negative electrode current collector layer extends to the outside. This makes it possible to adopt a configuration in which the overall length of the ventilation portion is relatively short, and gas generated inside the solid-state energy storage device can be effectively released to the outside. (6) By sealing and integrating the electrolyte into either the positive or negative electrode, it is possible to produce a solid-state storage battery simply by stacking the electrodes, making production easier. [Brief description of the drawings]

[0013] [Figure 1A] FIG. 1 is a perspective view showing a conceptual configuration of a solid-state battery stack in a solid-state power storage device according to an embodiment of the present invention. [Figure 1B] 1B is a side view of the solid-state electricity storage device of FIG. 1A as viewed in the Y direction. [Diagram 2] FIG. 2 is a plan view showing an example of a positive electrode system constituting the solid-state electricity storage device according to the embodiment of the present invention. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. [Figure 4] FIG. 2 is a perspective view showing an example of a component of a positive electrode system constituting the solid-state electricity storage device according to the embodiment of the present invention. [Diagram 5] FIG. 5 is a plan view of the components of the positive electrode system of FIG. [Figure 6] FIG. 4 is a perspective view showing another example of components of the positive electrode system constituting the solid-state electricity storage device according to the embodiment of the present invention. [Figure 7] FIG. 7 is an enlarged, cutaway perspective view of a portion of the component of FIG. 6. [Figure 8] FIG. 2 is a conceptual diagram showing one stage of a manufacturing process of a positive electrode system constituting a solid-state energy storage device according to an embodiment of the present invention. [Figure 9] FIG. 2 is a conceptual diagram showing one stage of a manufacturing process of a solid-state battery stack constituting a solid-state power storage device according to an embodiment of the present invention. [Figure 10] FIG. 4 is a plan view showing an example of a positive electrode system constituting a solid-state energy storage device as a comparative example to an embodiment of the present invention. [Figure 11] FIG. 11 is a partially enlarged view of FIG. [Figure 12] 11 is a perspective view showing a modified example of a three-way sealing member constituting the sealing frame of the solid-state energy storage device according to the embodiment of the present invention. FIG. [Figure 13] 13 is a diagram showing a state in which a sheet-like member in the three-way sealing member in FIG. 12 is thermally welded to a side surface of a solid electrolyte layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1A is a perspective view showing a conceptual configuration of a solid-state battery stack in a solid-state power storage device according to one embodiment of the present invention, in which the main surface direction of a substantially flat positive electrode system and a negative electrode system, both of which will be described later, is assumed to be the XY plane direction, and the stacking direction is assumed to be the Z direction. FIG. 1B is a side view of the solid-state electricity storage device in FIG. 1A as viewed in the Y direction. The solid-state battery stack 1 of FIGS. 1A and 1B will be described with reference to FIGS. 8 and 9 as well. FIG. 8 is a conceptual diagram showing one stage of the process for manufacturing the positive electrode system 10, which is a component of the solid-state battery laminate 1. As shown in FIG. FIG. 9 is a conceptual diagram showing one stage of a process for manufacturing a solid battery stack 1 constituting a solid power storage device. The positive electrode system 10 is configured by inserting a positive electrode active material layer 11 and an electrolyte (electrolytic solution) between two facing solid electrolyte layers 20, 20. A positive electrode current collector layer 12 is disposed so as to be in contact with the positive electrode active material layer 11 along the positive electrode active material layer 11. Similarly, the negative electrode system 30 is configured by inserting a negative electrode active material layer 31 and an electrolyte (electrolytic solution) between two facing solid electrolyte layers 20, 20. A negative electrode current collector layer 32 is disposed so as to be in contact with the negative electrode active material layer 31 along the positive electrode active material layer 31. As shown in FIG. 9, the positive electrode system 10 and the negative electrode system 30 are alternately stacked multiple times to form the solid battery stack 1 of FIG. 1A. In the solid battery stack 1, the projected shape of the stack of the positive electrode system 10 and the negative electrode system 30 in the stacking direction (Z direction in FIG. 1A) is approximately rectangular.

[0015] 2 is a plan view showing an example of the positive electrode system 10 of the above-mentioned solid battery laminate 1. The positive electrode system 10 is provided with a sealing frame 17 that is surrounded by four sealing members 13, 14, 15, and 16 extending along each side of the outer periphery of a rectangle to seal the inside. The sealing frame 17 is configured to have a three-sided sealing member 18 in which the sealing members 13, 14, and 15 on three sides along the outer periphery are connected, and a closing sealing member 19 that is arranged to close the open side of the three-sided sealing member 18. The sealing members 13, 14, 15, and 16 are configured from a material that has excellent chemical resistance, adhesiveness, and sealing properties, such as PP (polypropylene), PE (polyethylene), epoxy resin, urethane resin, acrylic resin, and silicone resin.

[0016] The closing and sealing member 19 is one of the sealing members 16 in the sealing frame 17. In the plan view of Fig. 2, the positive electrode active material layer 11 is surrounded by the sealing frame 17. In addition, the positive electrode current collector layer 12 extends outward from the sealing member 16 (the closing and sealing member 19).

[0017] The negative electrode system 30 is similar to the positive electrode system 10 in that a sealing frame is provided that is surrounded by four sealing members extending along each side of the outer periphery of a rectangle to seal the inside. The sealing frame is also similar to the positive electrode system 10 in that it is configured with a three-sided sealing member in which the sealing members on three sides along the outer periphery are connected, and a closing sealing member arranged to close the open side of the three-sided sealing member. For this reason, as a diagram showing the configuration having a sealing frame in the negative electrode system 30, FIG. 2 and FIGS. 10 and 11, which are comparative examples of this embodiment, are appropriately used. Note that, as shown in FIG. 9, in the negative electrode system 30, the lead-out direction of the negative electrode current collector layer 32 is opposite to the lead-out direction of the positive electrode current collector layer 12 in the positive electrode system 10.

[0018] In the solid state electricity storage device of the present invention, it is sufficient that at least one of the positive electrode system 10 and the negative electrode system 30 is sealed, but it is more preferable that both are sealed.

[0019] 1A, that is, when viewed as a projection shape onto the XY plane assumed in Fig. 1A, i.e., a projection shape into the stacking direction, the three-way sealing member 18 is roughly U-shaped or C-shaped, and the open side of this shape is closed by the closing sealing member 19. Moreover, the projection shapes onto the XY plane of each of the sealing members 13, 14, 15 constituting the three-way sealing member 18 and the closing sealing member 19, that is, the projection shapes into the stacking direction, are all roughly rectangular. In addition, one of the sealing members (13 or 15) of the three-way sealing member 18 and the stop sealing member 19 have a joining structure in which they are joined by thermal welding. Therefore, the solid-state battery stack 1 has high resistance to vibrations and the like, and a solid-state power storage device having this joining structure is well suited for use as an electric energy source in a mobile object such as an electric vehicle.

[0020] In this embodiment, the open side of the three-way sealing member 18 is closed by the closing sealing member 19, but a ventilation part 2 is provided to allow gas generated within the sealing frame 17 to escape. The ventilation part 2 is formed as a groove part 3 formed in at least one of the vicinity of the left end parts 131 and 151 of the sealing members 13 and 15 arranged in parallel among the three sealing members 13, 14, and 15 constituting the three-way sealing member 18, and the other end part 192 and one end part 191 of the closing sealing member 19. One specific example of this ventilation part 2 (groove part 3) is shown in FIG. 2 and FIG. 3, which is a partially enlarged view thereof.

[0021] 2 and 3, a groove portion 3 is formed on the surface facing the end face of the closing sealing member 19 at each end (the left end in the figure) of the parallel sealing members 13 and 15 of the three-way sealing member 18. As shown in the figures, the positive electrode current collector layer 12 extends outward from the closing sealing member 19.

[0022] In other words, the ventilation portion 2 (groove portion 3) is formed in an opposing portion of the three-way sealing member 18 (sealing members 13, 15) which is one of the three-way sealing member 18 and the closing sealing member 19, where the two come into contact with each other.

[0023] 3 shows a partially enlarged view of the vicinity of the left end 151 of the sealing member 15. A groove 3 is formed at a certain depth in the thickness direction of the sealing member 15 on the surface of the sealing member 15 facing the end (the lower end in the figure) of the closure sealing member 19 near the left end 151. That is, the sealing member 15 has a vent portion 2 that communicates with the outside of the sealing frame 17 via the groove portion 3. This vent portion 2 extends in the direction in which the positive electrode current collector layer 12 extends from the closure sealing member 19 to the outside.

[0024] As with the sealing member 15, the sealing member 13 of the three-way sealing member 18 has a groove 3 formed at a certain depth in the thickness direction of the sealing member 13 on the surface of the end of the sealing member 13 (the left end 131 in the drawing) facing the end face of the closing sealing member 19. That is, the sealing member 13 has a ventilation part 2 that communicates with the outside of the sealing frame 17 through the groove 3.

[0025] 4 and 5 show other examples of the ventilation part 2 that communicates with the outside of the sealing frame 17. In FIG. FIG. 4 is a perspective view showing an example of the components of the positive electrode system. FIG. 5 is a plan view of the components of FIG. 4. In FIG. 4 and FIG. 5, the closing sealing member 19 is shown among the three-way sealing member 18 and the closing sealing member 19 constituting the sealing frame 17 (FIG. 2). The positive electrode current collector layer 12 is led out from the closing sealing member 19 to the outside. In the example of FIG. 4 and FIG. 5, a slit 4 is formed at the approximate center position in the longitudinal direction of the closing sealing member 19 so as to cross the closing sealing member 19 in the width direction. That is, the slit 4 forms a vent portion 2 that communicates with the outside of the sealing frame 17. The vent portion 2 extends along the direction in which the positive electrode current collector layer 12 extends out from the closing sealing member 19 to the outside.

[0026] 6 and 7 show still another example of the ventilation part 2 that communicates with the outside of the sealing frame 17 (FIG. 2). FIG. 6 is a perspective view showing another example of the components of the positive electrode system. FIG. 7 is a partially enlarged perspective view of the components of FIG. 6. In FIGS. 6 and 7, the closing sealing member 19 is shown among the three-way sealing member 18 and the closing sealing member 19 constituting the sealing frame 17 (FIG. 2). The positive electrode current collector layer 12 is led out from the closing sealing member 19 to the outside. In the example of FIGS. 6 and 7, a groove-shaped portion 5 is formed at one end 191 and the other end 192 in the longitudinal direction of the closing sealing member 19 so as to cross the closing sealing member 19 in the width direction. That is, the groove-shaped portion 5 forms a vent portion 2 that communicates with the outside of the sealing frame 17 (FIG. 2). The vent portion 2 extends along the direction in which the positive electrode current collector layer 12 extends out from the closing sealing member 19 to the outside.

[0027] In other words, the ventilation portion 2 (groove-like portion 5) is formed in an opposing portion of the three-way sealing member 18 and the closing sealing member 19, which is one of the closing sealing member 19 (its ends 191, 192), where the two come into contact with each other.

[0028] The three-way sealing member 18 and the closing sealing member 19 constituting the above-mentioned sealing frame 17 (FIG. 2) are bonded to the solid electrolyte layer 20 at their upper and lower surfaces by thermal welding. Here, the upper surface refers to the upper surface in the stacking direction of the solid battery stack 1, and the lower surface refers to the lower surface in the stacking direction of the solid battery stack 1.

[0029] 8 and 9, the solid-state battery laminate 1 has been described with reference to FIG. 1A. In the above description, for convenience, the negative electrode system 30 is laminated under the positive electrode system 10, and thus the positive electrode system 10 and the negative electrode system 30 are laminated in multiple alternate layers. However, the above description does not intend to specify the order of lamination of the positive and negative electrodes. The positive electrode system 10 may be laminated under the negative electrode system 30, and multiple alternate laminates in this form may be laminated. In addition, the positive electrode may be sandwiched between solid electrolytes and sealed, and then laminated with the negative electrode. In addition, the negative electrode and the solid electrolyte, and the solid electrolyte and the negative electrode may be laminated in the above-mentioned order and sealed. Note that the structure of the bottom surface and the top surface of the laminate is applied with a process different from that of the periodic structure laminated in the middle.

[0030] Next, the effects of the solid power storage device according to the embodiment of the present invention will be described in comparison with a solid power storage device of a comparative example. Fig. 10 is a plan view showing an example of a positive electrode system constituting a solid-state electricity storage device as a comparative example to the embodiment of the present invention. Fig. 11 is a partially enlarged view of Fig. 10. In Fig. 10 and Fig. 11, parts corresponding to those in Fig. 2 and Fig. 3 are given the same reference numerals.

[0031] In Fig. 10 and Fig. 11, one end 191 and the other end 192 of the closing sealing member 19 each have a flat surface. The flat surface of the lower end 191 of the closing sealing member 19 abuts against the flat surface of the side surface near the left end 151 of the sealing member 15. Similarly, the flat surface of the other end 192 of the closing sealing member 19 abuts against the flat surface of the side surface near the left end 131 of the sealing member 13. At these abutting points, the closing sealing member 19 and the sealing member 15 are joined, and the closing sealing member 19 and the sealing member 13 are joined. Since the joining surfaces are flat, there is no ventilation part that allows gas generated inside the sealing frame 17 to escape to the outside. In other words, in the embodiment of the present invention, since the ventilation part 2 is provided at an appropriate position, gas generated inside the sealing frame 17 can be escaped to the outside through this ventilation part 2. Therefore, defects such as destruction of the electrode structure are prevented in advance.

[0032] FIG. 12 is a perspective view showing a modified example of a three-way sealing member constituting the sealing frame of the solid-state power storage device according to the embodiment of the present invention. FIG. 13 is a diagram showing how the sheet-like members in the three-way sealing member in FIG. 12 are thermally welded to the sides of the solid electrolyte layer.

[0033] The sealing member 15 in the three-way sealing member 18 in Fig. 12 and Fig. 13 has a sheet-like member 150a extending upward from the upper outer edge side of the sealing member main body 150, which is a component constituting the sealing frame 17, and a sheet-like member 150b extending downward from the lower outer edge side of the sealing member main body 150. Here, "upper" means "upward" in the stacking direction of the solid-state battery stack 1, and "lower" means "downward" in the stacking direction of the solid-state battery stack 1. The sealing member main body 150 and the sheet-like members 150a and 150b in the sealing member 15 are made of PP (polypropylene) or PE (polyethylene) and are connected together. The sheet-like members 150a and 150b are thin enough to bend inward of the sealing frame 17 under their own weight.

[0034] The sheet-like member 150a may be provided on the outer edge of the upper end of the closure sealing member 19 (FIG. 2), and the sheet-like member 150b may be provided on the outer edge of the lower end of the closure sealing member 19.

[0035] The upward and downward lengths of the sheet-like members 150a and 150b are preferably shorter than the sum of the thickness of the solid electrolyte layer 20 and the width of the sealing member 15 in the short side direction, and are more preferably shorter than the thickness of the solid electrolyte layer 20.

[0036] The solid power storage device of this embodiment provides the following advantages. In the solid-state energy storage device of (1), at least one of the three-way sealing member 18 and the closing sealing member 19 in at least one of the positive electrode system 10 and the negative electrode system 30 is provided with a vent 2 communicating with the outside. Gas generated inside the sealed frame 17 escapes to the outside of the solid-state energy storage device through this vent 2, thereby preventing defects such as destruction of the electrode structure.

[0037] In the solid power storage device of (2), the vent portion 2 is formed by the slit 4 provided in the closure sealing member 19, and this simple structure allows gas generated inside the solid power storage device to be effectively released to the outside.

[0038] In the solid-state energy storage device (3), a ventilation section 2 is formed in the opposing portion where at least one of the three-way sealing member 18 and the closing sealing member 19 contact each other, so that gas generated inside the solid-state energy storage device can be effectively released to the outside while maintaining the strength of the three-way sealing member 18 and the closing sealing member 19.

[0039] In the solid-state energy storage device (4), the ventilation section 2 is formed in an opposing portion of at least one of the three-way sealing member 18 and the closing sealing member 19 of the positive electrode system 10 where the two are in contact with each other. Therefore, on the positive electrode system 10 side where a relatively large amount of gas is generated, gas generated inside the solid-state energy storage device can be effectively released to the outside.

[0040] In the solid-state energy storage device (5), the ventilation section 2 is formed in the closure sealing member 19 so as to extend in a direction in which at least one of the positive electrode current collector layer 12 and the negative electrode current collector layer 32 extends to the outside. This makes it possible to adopt a configuration in which the overall length of the ventilation section 2 is relatively short, and gas generated inside the solid-state energy storage device can be effectively released to the outside.

[0041] Although one embodiment of the present invention has been described above, the present invention is not limited to this. The detailed configuration may be changed as appropriate within the scope of the present invention. For example, in the above example, the groove, slit, and groove-like portion that constitute the ventilation portion are provided in one line at one location, but multiple relatively thin (shallow) ones may be provided in parallel at each corresponding location. [Explanation of symbols]

[0042] 1...Solid-state battery stack 2…Ventilation section 3...Groove 4. Slit 5…Groove portion 10...Positive electrode (positive electrode system) 11...Cathode active material layer 12...Positive electrode current collector layer 13, 14, 15, 16... Sealing member 17...Sealed frame 18...Three-sided sealing member 19... Closing and sealing member 20…Solid electrolyte layer 30…Negative electrode (negative electrode system) 31…Negative electrode active material layer 32…Negative electrode current collector layer

Claims

1. a positive electrode system in which a positive electrode active material layer is disposed between two facing solid electrolyte layers and a positive electrode current collector layer is disposed in contact with the positive electrode active material layer, and a negative electrode system in which a negative electrode active material layer is disposed and a negative electrode current collector layer is disposed in contact with the negative electrode active material layer are alternately laminated, and the projected shape in the stacking direction is substantially rectangular; Each of the positive electrode system and the negative electrode system is provided with a sealing frame that is surrounded by four sealing members extending along each side of a rectangular periphery to seal the inside, The sealing frame has a three-way sealing member formed by connecting sealing members on three sides along the outer periphery, and a closing sealing member arranged to close an open side of the three-way sealing member, a vent portion communicating with the outside is provided in at least one of the three-way sealing member and the stopper sealing member in at least one of the positive electrode system and the negative electrode system; The ventilation portion is formed in an opposing portion of at least one of the three-way sealing member and the closing sealing member where the two members come into contact with each other. Solid state power storage device.

2. The solid power storage device according to claim 1 , wherein the ventilation portion is formed by a slit provided in the closure sealing member.

3. The solid-state electricity storage device according to claim 1 , wherein the ventilation portion is formed in an opposing portion of at least one of the three-way sealing member and the stopper sealing member where the two are in contact with each other, of the positive electrode system.

4. The solid state power storage device according to claim 1 , wherein the ventilation portion is formed in the closure sealing member so as to extend in a direction in which at least one of the positive electrode current collector layer and the negative electrode current collector layer extends to the outside.

5. The solid state electricity storage device according to claim 1 , wherein an electrolyte is sealed in at least one of the positive electrode system and the negative electrode system.

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