JP5754337B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device.

  In the prior art, a power storage device in which a single cell is accommodated in a container is known. In the case where the power storage device has a plurality of single cells, it is known that the plurality of single cells are arranged and accommodated inside the container. In a power storage device including a plurality of plate-shaped single cells, it is known that a restraint plate is disposed on both sides of a stacked body in which a plurality of unit cells are stacked, and is fixed with a connecting rod that couples the restraint plates on both sides. . The unit cell stack thus formed is placed inside the container. In addition, it is known that pressure is applied to the unit cells included in the stack by fixing the restraining plates on both sides of the stack of unit cells with a connecting rod.

  Japanese Patent Application Laid-Open No. 2010-40345 discloses a battery system in which an assembled battery is configured by a plurality of single cells, and the assembled battery is pressurized by two plate-like side bases. The battery system includes a pressure plate that pressurizes each unit cell, and a pressure cooling unit that is disposed between the pressure plates and includes a cooling conduit that can be deformed by pressure while the refrigerant passes through the inside. Has been.

  Japanese Patent Application Laid-Open No. 2005-302698 includes eight battery stacks each formed by stacking 10 stages of secondary batteries, and a heat sink is disposed between the secondary batteries of the battery stack. An assembled battery is disclosed. Eight sets of battery stacks are arranged in the same plane and housed in a casing. In this assembled battery, a fan is disposed in the outlet duct of the casing, and the cooling air introduced into the casing from the inlet duct of the casing enters each passage formed in the heat sink and enters the passage. It is disclosed that the secondary battery is indirectly cooled and the secondary battery is directly cooled by entering a flow path formed between the battery stacks.

JP 2010-40345 A JP-A-2005-302698

  Some rechargeable batteries that can be charged and discharged gradually deteriorate in electrical characteristics as the charging and discharging electric operations are performed. For example, in the case of a lithium ion battery including a positive electrode active material and a negative electrode active material, the active material expands or contracts with insertion or extraction of lithium ions. For example, many active materials have a characteristic of expanding when lithium ions are occluded and contracting when lithium ions are released.

  When charging and discharging are repeated and the active material repeats expansion and contraction, there arises a problem that the positive electrode or the negative electrode containing the active material is cracked or the positive electrode or the negative electrode is peeled off from the adjacent current collector. Further, in an all-solid battery in which the electrolyte layer disposed between the positive electrode and the negative electrode is solid, there arises a problem that the contact resistance at the interface between the positive electrode or the negative electrode and the electrolyte layer increases. As a result, cycle characteristics and other electrical characteristics are deteriorated. For example, there arises a problem that the battery capacity decreases when charging and discharging are repeated.

  Therefore, even when charging and discharging are repeatedly performed by pressurizing the cell from the outside, the cell can be restrained and the deterioration of electrical characteristics such as cycle characteristics can be suppressed. can do.

  In the battery system disclosed in Japanese Unexamined Patent Application Publication No. 2010-40345, a plurality of unit cells are pressed from both sides of the unit cell stack by side bases. In the case of such a configuration, since a plurality of single cells can be pressurized at a time, the number of members for pressing can be reduced. That is, since the area for pressurizing the plurality of single cells is small, the power storage device can be downsized and the volume efficiency is improved. However, there is a problem in that the heat dissipation of the unit cells is deteriorated because the large unit areas of the unit cells contact each other between the adjacent unit cells. That is, since most of the surfaces of the plurality of unit cells are in contact with adjacent unit cells, there is a problem that the heat dissipation area is reduced.

  In the battery system disclosed in the above Japanese Patent Application Laid-Open No. 2010-40345, pressure cooling means including a cooling pipe line is disposed between the single cells, but pressure is applied between the single cells. When the cooling means is arranged, there is a problem that the power storage device becomes large. That is, there is a problem that a space for disposing the cooling member between the single cells is required, and the volume efficiency is deteriorated. Similarly, in the assembled battery disclosed in Japanese Patent Application Laid-Open No. 2005-302698, a heat sink for cooling the secondary battery is arranged between the secondary batteries of the battery stack, and the volume efficiency There is a problem that is bad.

  Japanese Patent Application Laid-Open No. 2005-302698 discloses that eight battery stacks are arranged on the same plane. When a plurality of unit cells are arranged on the same plane, the area for pressing the unit cells increases. That is, pressure must be applied to a larger area. For this reason, there exists a problem that the whole force for pressurizing a cell becomes large. Alternatively, there is a problem that a device for pressurizing the unit cell becomes large and the volume efficiency of the power storage device is deteriorated.

  It is an object of the present invention to provide a power storage device that includes a plurality of single cells and achieves both heat dissipation and volume efficiency of the single cells.

  The power storage device of the present invention includes a plurality of unit cells, and a sealed container that houses the plurality of unit cells and can be sealed. The unit cell includes a case having an area maximum surface that maximizes the area. The sealed container is filled with a pressurized fluid with the inside sealed. The plurality of single cells are arranged in the same plane with the maximum surface area of the case inside the sealed container.

  In the said invention, it is preferable that the clearance gap is formed between the surface area maximum surface of a case and the wall surface of an airtight container.

  In the above-described invention, the unit cells in which the maximum surface area of the case is arranged in the same plane form the first single cell, and the maximum surface area of the case is the area of the first single cell inside the sealed container. A plurality of second unit cells arranged so as to be substantially perpendicular to the maximum surface, and the number of the first unit cells arranged continuously rather than the number of the second unit cells arranged continuously. It is preferable that they are arranged in such a way that the number is larger.

  In the above invention, the single battery can include an all-solid battery having a solid positive electrode layer, a solid electrolyte layer, and a solid negative electrode layer.

  According to the present invention, it is possible to provide a power storage device that includes a plurality of single cells and achieves both heat dissipation and volume efficiency of the single cells.

It is a schematic exploded perspective view of the 1st electrical storage apparatus in an embodiment. It is a schematic perspective view of the cell in embodiment. It is an expansion schematic sectional drawing inside the single cell in embodiment. It is a schematic sectional drawing when the 1st electrical storage apparatus in embodiment is cut | disconnected in the direction where a cell is located in a line. It is a schematic exploded perspective view of the 2nd electrical storage apparatus in an embodiment. It is a schematic exploded perspective view of the 3rd electrical storage apparatus in an embodiment.

  A power storage device according to an embodiment will be described with reference to FIGS. The power storage device in the present embodiment is arranged in a drive device such as a hybrid vehicle or an electric vehicle.

  FIG. 1 is a schematic exploded perspective view of a first power storage device in the present embodiment. The power storage device in the present embodiment includes a single battery 22 as a battery cell. In the present embodiment, a plurality of unit cells 22 are arranged side by side. The power storage device in the present embodiment includes an airtight container 24 as a container that accommodates unit cell 22 therein. A plurality of unit cells 22 are accommodated in the sealed container 24. The sealed container 24 is formed so that the internal space can be sealed.

  The sealed container 24 in the present embodiment includes a box member 24a and a lid member 24b. The box member 24a has a U-shaped cross-section and is formed so as to accommodate the unit cell 22 therein. The lid member 24b is formed so as to cover the top of the box member 24a. A seal member for suppressing gas leakage is disposed at a contact portion between the box member 24a and the lid member 24b. As shown by the arrow 51, the inside of the sealed container 24 is sealed by fixing the lid member 24b to the box member 24a. The sealed container 24 can be formed of, for example, aluminum or stainless steel. The sealed container 24 is not limited to this form, and a container capable of sealing the inside can be employed.

  The sealed container 24 is filled with a pressurized fluid. In the present embodiment, the gas is filled at a pressure greater than atmospheric pressure. As the gas filled in the sealed container 24, an inert gas such as argon or nitrogen can be employed. Alternatively, the gas filled in the sealed container 24 may be a gas other than an inert gas.

  FIG. 2 shows a schematic perspective view of the unit cell in the present embodiment. The unit cell 22 in the present embodiment is formed in a rectangular parallelepiped shape. The unit cell 22 includes a case 23 and terminals 22 a and 22 b protruding from the case 23. The terminals 22a and 22b are parts that conduct electricity. In the example shown in FIG. 2, the terminal 22a is a positive electrode and the terminal 22b is a negative electrode. The terminals 22a and 22b of the unit cell 22 shown in FIG. 2 are formed so as to protrude in one direction.

  Case 23 of unit cell 22 in the present embodiment is formed in a plate shape, and has area maximum surface 23a that maximizes the area. The case 23 has a side surface 23b adjacent to the maximum area surface 23a and having a smaller area than the maximum area surface 23a. The unit cell 22 in the present embodiment is a rectangular parallelepiped, but is not limited to this form, and any shape having an area maximum surface that maximizes the area can be adopted.

  Case 23 of unit cell 22 in the present embodiment has a function of sealing gas, and is formed of a material that can be deformed by applying pressure from the outside. The case 23 of the unit cell 22 is preferably formed of a flexible material. By forming the case 23 with a flexible material, the inside can be efficiently pressurized. The case 23 can be formed of a thin resin such as a laminate film. For example, an aluminum laminate material or the like can be used. The aluminum laminate material is suitable because it is a member having gas barrier properties and flexibility.

  FIG. 3 shows an enlarged schematic cross-sectional view of the inside of the unit cell in the present embodiment. The unit cell 22 in the present embodiment is a lithium ion battery. The unit cell 22 in the present embodiment is an all solid state battery. The unit cell 22 in the present embodiment has a positive electrode layer 30, a negative electrode layer 31, and an electrolyte layer 32 interposed between the positive electrode layer 30 and the negative electrode layer 31. A laminate of the positive electrode layer 30, the negative electrode layer 31, and the electrolyte layer 32 is laminated via a current collector 33. The stacked body shown in FIG. 3 is arranged inside the case 23 of the unit cell 22. The current collector 33 at a predetermined position is connected to the terminal 22a or the terminal 22b.

  The internal structure of the unit cell in the present embodiment is formed in a rectangular parallelepiped shape. The internal structure of the unit cell is not limited to a rectangular parallelepiped laminated body, and an arbitrary shape can be adopted. For example, a laminate of a positive electrode layer, a negative electrode layer, and an electrolyte layer may be formed in a band shape, and a roll of the belt-like laminate body may be disposed inside the case.

  Each of the positive electrode layer 30, the negative electrode layer 31, and the electrolyte layer 32 in the present embodiment is solid and formed of powder. The positive electrode layer, the negative electrode layer, and the electrolyte layer in the present embodiment can be formed, for example, by compressing a material powder using a press.

The positive electrode layer 30 has a particulate positive electrode active material. As the positive electrode active material, any material that can be employed in an all-solid battery can be employed. As the positive electrode active material, for example, a layered composite oxide powder of lithium and transition metal such as LiCoO ₂ or LiNiO ₂ , a spinel type powder such as LiMn ₂ O ₄ , or an olivine type powder such as LiFePO ₄ is used. be able to. The negative electrode layer 31 has a particulate negative electrode active material. As the negative electrode active material, any material that can be employed in an all-solid battery can be employed. As the negative electrode active material, for example, a metal-based active material such as In powder or Al powder, or a carbon-based active material such as mesocarbon microbead powder can be used.

The electrolyte layer has a particulate solid electrolyte having ionic conductivity. As the solid electrolyte, any substance that can be employed in an all-solid battery can be employed. As the solid electrolyte, for example, a sulfide-based solid electrolyte or an oxide-based solid electrolyte can be used. As the sulfide-based solid electrolyte, Li ₂ S—P ₂ S ₅ powder, 70Li ₂ S-30P ₂ S ₅ powder, Li ₂ S—SiS ₂ powder, or the like can be used. As the oxide-based solid electrolyte, Li ₂ S—P ₂ O ₅ powder or the like can be used.

  A current collector 33 for collecting current is disposed outside the positive electrode layer 30 and the negative electrode layer 31. The current collector 33 in the present embodiment is formed of a metal foil. As the current collector, for example, a material such as aluminum, stainless steel, or copper can be used.

  In the all solid state battery of the present embodiment, all of the positive electrode layer, the negative electrode layer, and the electrolyte layer are formed of powder. However, the present invention is not limited to this form, and may include, for example, a metal electrode layer.

  In the unit cell 22 of the present embodiment, the pressure inside the case 23 is atmospheric pressure. The unit cell 22 is not limited to this form, and the inside of the case 23 can be decompressed to less than atmospheric pressure. The all-solid-state battery in this embodiment is not filled with a solvent or the like, and the solvent is not volatilized. Therefore, the inside of the case can be decompressed. As a result, the pressure difference between the inside of the case 23 and the outside of the case 23 can be increased, and the pressure for pressurizing the unit cell 22 can be increased. As a result, for example, the output of the power storage device can be increased.

  FIG. 4 is a schematic cross-sectional view when the first power storage device in the present embodiment is cut along the direction in which the cells are arranged. 4 is a cross-sectional view taken along line AA in FIG. With reference to FIG. 1, FIG. 2, and FIG. 4, the plurality of single cells 22 in the present embodiment are arranged side by side in one direction.

  In the present embodiment, the terminals 22a and 22b of the unit cell 22 are electrically connected to the terminals 22a and 22b of the adjacent unit cells via a bus bar 27 as a conductive member. The positive terminal 22 a of one unit cell 22 is connected to the negative terminal 22 b of another adjacent unit cell 22. In the power storage device of the present embodiment, a plurality of unit cells 22 are electrically connected in series. The connection method of the plurality of unit cells 22 is not limited to series, and all the unit cells or some of the unit cells may be connected in parallel.

  An external connection terminal 28a is connected to the terminal 22a of the unit cell 22 at one end in the direction in which the plurality of unit cells 22 are arranged. An external connection terminal 28b is connected to the terminal 22b of the unit cell 22 at the other end in the direction in which the plurality of unit cells 22 are arranged. The external connection terminals 28 a and 28 b are formed so as to penetrate the sealed container 24 and protrude outside the sealed container 24. The external connection terminals 28a and 28b are terminals for supplying electricity to an external device or receiving electricity from an external device for charging. For example, a device for charging / discharging is connected to the external connection terminals 28a and 28b.

  The unit cell 22 in the present embodiment is supported by the sealed container 24 via a positioning member 41 as a support member. In the first power storage device of the present embodiment, positioning member 41 has an end surface on which terminals 22a and 22b of case 23 are disposed and an end surface on the opposite side to the side on which terminals 22a and 22b of case 23 are disposed. And is arranged to support. Almost all of the area maximum surface 23a of the case 23 of the unit cell 22 is exposed. The maximum area surface 23 a contacts the gas filled in the sealed container 24. The support member for supporting the unit cell is not limited to this form, and a support member for performing arbitrary positioning can be employed.

  FIG. 4 shows a plane 45 serving as a reference in the present embodiment. In the plurality of unit cells 22 in the present embodiment, the maximum area surface 23 a is arranged along the plane 45. That is, the plurality of single cells 22 in the present embodiment are arranged side by side. The plurality of unit cells 22 are arranged such that the area maximum surface 23a is in the same plane. In the first power storage device of the present embodiment, the unit cell 22 is arranged so that the maximum area surface 23 a of the unit cell 22 is substantially parallel to the bottom surface or the top surface of the sealed container 24.

  The plurality of single cells 22 are arranged away from each other. Further, a gap is formed between the maximum area 23 a of the unit cell 22 and the wall surface of the sealed container 24. The power storage device in the present embodiment is arranged such that a gap is formed between the outer peripheral surface of the unit cell 22 and the sealed container 24 so that the gas filled in the sealed container 24 flows.

  The inside of the sealed container 24 in the present embodiment is filled with a pressurized gas and sealed. The unit cell 22 is pressurized by the surrounding gas. Although the positive electrode active material or the negative electrode active material expands or contracts with charging and discharging, the occurrence of cracks in the positive electrode layer 30 and the negative electrode layer 31 due to the expansion and contraction can be suppressed. Moreover, since the volume change of the positive electrode layer 30 and the negative electrode layer 31 can be suppressed, it is possible to suppress the positive electrode layer 30 or the negative electrode layer 31 from being separated from the current collector 33. In addition, since the power storage device in the present embodiment pressurizes the unit cell 22 with gas, the entire unit cell 22 can be uniformly pressurized.

  Furthermore, the unit cell in the present embodiment includes an all-solid battery. The all solid state battery has a solid positive electrode layer, a solid electrolyte layer, and a solid negative electrode layer. For this reason, an interface between the solid layers of the electrolyte layer 32 and the positive electrode layer 30 or the negative electrode layer 31 exists inside the unit cell 22. By applying pressure to the unit cell, it is possible to reduce the resistance generated at the interface between the solid layers. Furthermore, it can suppress that peeling etc. arise in the interface of solid layers and internal resistance increases. For this reason, deterioration of electrical characteristics such as a decrease in capacity of the power storage device can be suppressed.

  In the power storage device of the present embodiment, a gap is formed between the unit cell 22 and the wall surface of the sealed container 24. Even when an external force is applied to the sealed container 24 and the sealed container 24 is deformed, the unit cell 22 is pressurized by the internal gas, so that the influence of the external force can be suppressed. Even if an external force is applied to the sealed container 24, the unit cell 22 can be pressurized at a substantially constant pressure. In this embodiment, gaps are formed around almost the entire outer peripheral surface of the unit cell. However, the present invention is not limited to this configuration, and a part of the outer peripheral surface of the unit cell is in contact with the sealed container. It doesn't matter.

  By the way, as a method of pressurizing the unit cell, for example, the constraining plates can be fixed to each other with a fixing rod or the like, with the constraining plate sandwiching the maximum surface area of the unit cell. When the cells are mechanically pressed by the restraining plate and the fixing rod, the distance between the restraining plates is kept constant. For this reason, when a cell deform | transforms, the pressure which presses a cell may change. For example, when the unit cell is gradually deformed due to long-term use, the pressing pressure may change. On the other hand, in this embodiment, since the unit cell is pressurized with gas, pressurization can be continued at a substantially constant pressure even if the unit cell is deformed.

  Further, when the unit cell 22 is arranged so that the area maximum surface 23a is in the same plane, the pressurization area for pressurizing the unit cell 22 becomes large, and when the unit cell is pressed by a restraining plate or the like. Increases the volume of a restraining member such as a restraining plate. In the present embodiment, since the unit cell 22 is pressurized by the gas inside the sealed container 24, the restraining member for pressurizing the unit cell 22 can be eliminated. For this reason, the power storage device can be reduced in size and the volume efficiency is improved.

  The inside of the sealed container in the present embodiment is sealed. For this purpose, the unit cell 22 is cooled by the gas enclosed in the sealed container 24. Heat generated in the unit cell 22 is released to the outside of the power storage device through the gas filled in the sealed container 24 and the sealed container 24. For example, cooling can be performed by flowing a cooling fluid around the sealed container 24 of the power storage device.

  In the first power storage device according to the present embodiment, since the maximum area surface 23a of the case 23 of the unit cell 22 is arranged on the same plane, the maximum area surfaces 23a of the unit cell 22 are in contact with each other to dissipate heat. Can be avoided. The area maximum surface 23a of each unit cell 22 can be brought into contact with the gas sealed in the sealed container 24, and the heat dissipation of the unit cell 22 can be improved. That is, the unit cell 22 can be efficiently cooled.

  Thus, the power storage device of the present embodiment can achieve both the heat dissipation of the unit cell and the volume efficiency of the power storage device.

  The first power storage device of the present embodiment is arranged such that the plurality of unit cells 22 are arranged in a line along one direction. However, the present invention is not limited to this mode, and the plurality of unit cells have the largest area surface. It does not matter as long as they are arranged on the same plane.

  FIG. 5 is a schematic exploded perspective view of the second power storage device in the present embodiment. The unit cell 22 in the second power storage device is arranged on the surface where the terminals 22a and 22b are opposite to each other among the surfaces adjacent to the maximum area surface 23a. The terminals 22a and 22b are formed so as to protrude from the case 23 in opposite directions. The positive terminal 22a protrudes from the surface on one side of the case 23, and the negative terminal 22b protrudes from the surface opposite to the one side.

  The plurality of unit cells 22 are arranged inside the sealed container 24 so that the terminals 22 a and 22 b of the unit cells 22 adjacent to each other face each other. A positive terminal 22a of one unit cell 22 and a negative terminal 22b of another unit cell 22 are connected to each other. The positive external connection terminal 28 a protrudes from one side of the sealed container 24. The negative external connection terminal 28 b protrudes from the other side of the sealed container 24. Each unit cell 22 is supported by the sealed container 24 via a support member 41.

  In the second power storage device, the terminals can be directly connected to each other. Also in the second power storage device, since the maximum area surface 23a of the unit cell 22 is arranged on the same plane, the heat dissipation of the unit cell is excellent, and the volume efficiency of the power storage device can be improved.

  FIG. 6 is a schematic exploded perspective view of the third power storage device in the present embodiment. In the third power storage device, the unit cell arranged so that the maximum area surface 23a is in the same plane is referred to as a first unit cell 22. The third power storage device includes a second unit cell 25 arranged so that the maximum area surface 23 a of the case 23 is substantially perpendicular to the maximum area surface 23 a of the first unit cell 22. The second unit cell 25 is arranged such that the maximum area surface 23a is substantially perpendicular to one reference plane. As described above, in the third power storage device, the first unit cell 22 is arranged horizontally, whereas the second unit cell 25 is arranged vertically.

  The third power storage device includes a plurality of second unit cells 25. The plurality of second unit cells 25 are arranged side by side. The second unit cells are arranged such that the maximum area surfaces 23a are in contact with each other. Each second unit cell 25 is supported by the sealed container 24 via a support member 41. The first cell 22 and the second cell 25 are electrically connected to each other in series via the bus bar 27. The plurality of second unit cells 25 are also electrically connected in series with each other via the bus bar 27.

  The box member 24a and the lid member 24b of the sealed container 24 are formed in accordance with the arrangement of each unit cell so as to accommodate the plurality of first unit cells 22 and the plurality of second unit cells 25 therein. Yes.

  In the third power storage device of the present embodiment, at least some of the plurality of unit cells 22 and 25 are arranged such that the maximum area 23a of the case 23 is the same plane. By adopting this configuration, heat dissipation can be improved as compared with a power storage device in which a plurality of unit cells have the largest surface area in contact with each other and stacked. In the portion where the second unit cells 25 are continuously arranged, the heat dissipation of the unit cells is inferior. However, in the portion where the first unit cells 22 are continuously arranged, the heat dissipation of the unit cells is excellent. The heat dissipation can be improved. In this way, at least a part of the cells can be placed horizontally to improve the heat dissipation of the cells.

  The number of the second unit cells 25 that are continuously arranged is preferably a number that does not greatly deteriorate the heat dissipation of the second unit cells 25. For example, it is preferable that the number of the first unit cells 22 that are continuously arranged is larger than the number of the second unit cells 25 that are continuously arranged. That is, it is preferable that the number of facings of the side surfaces 23b of the case 23 of the plurality of unit cells is larger than the number of facings of the area maximum surfaces 23a of the case 23 of the plurality of unit cells. In this way, the overall heat dissipation of a plurality of single cells is improved by forming so that the number of horizontally arranged single cells is larger than the number of vertically arranged single cells. Can be made. In the embodiment shown in FIG. 6, two second unit cells 25 are continuously arranged. However, since the maximum number of surface areas 23 a are in contact with each other, the number of second unit cells 25 is small. The heat dissipation can be ensured.

  In the third power storage device of the present embodiment, the maximum area 23a of the second unit cell 25 is formed so as to be substantially perpendicular to the maximum area 23a of the first unit cell 22. The present invention is not limited to this configuration, and the maximum area surface 23a of the second unit cell 25 may be disposed so as to be inclined with respect to the maximum area surface 23a of the first unit cell 22. That is, the first unit cell 22 is disposed so that the maximum area surface 23a is substantially parallel to the reference plane, and the second unit cell 25 intersects the reference plane with the maximum area surface 23a. It may be arranged so as to.

  The single battery in this embodiment has been described by exemplifying an all-solid-state battery among lithium ion batteries, but is not limited to this form, and the present invention can be applied to a power storage device including any single battery that generates heat. . For example, the present invention can be applied to a lithium ion battery or the like in which the electrolyte layer is formed of a liquid.

  In the power storage device of this embodiment, the sealed container is always sealed. However, the present invention is not limited to this form, and the sealed container may be formed so as to be able to be sealed. For example, a pressure adjusting device that adjusts the internal pressure may be connected to the sealed container, and the internal pressure may be adjusted when the power storage device is used.

  Moreover, in this Embodiment, gas is employ | adopted as a fluid with which the inside of an airtight container is filled, but it is not restricted to this form, Arbitrary fluid can be filled into the inside of an airtight container. For example, the inside of the sealed container may be filled with a liquid.

  The above embodiments can be combined as appropriate. In the respective drawings described above, the same or equivalent parts are denoted by the same reference numerals. In addition, said embodiment is an illustration and does not limit invention. In the embodiment, the change shown in a claim is included.

22, 25 Single cell 23 Case 23a Maximum surface area 24 Sealed container 30 Positive electrode layer 31 Negative electrode layer 32 Electrolyte layer 33 Current collector 41 Positioning member 45 Plane

Claims (4)

Multiple cells,
The plurality of single cells are housed inside, and a hermetically sealed container is provided,
The unit cell includes a case having an area maximum surface where the area is maximized,
The sealed container is filled with a pressurized fluid with the inside sealed , and has a pair of wall surfaces facing each other,
Wherein the plurality of unit cells, in the interior of the sealed container, and largest area face of the casing is arranged on the same plane,
One of the pair of wall surfaces faces a maximum area surface of the case, and the other of the pair of wall surfaces faces a surface opposite to the maximum area surface of the case . A gap is formed between one of the pair of wall surfaces of the closed container with the maximum area surface of said case, power storage device according to claim 1. The single cell maximum area surfaces of the case are disposed on the same plane constitute a first unit cell,
In the interior of the sealed container, comprising the other cases with a maximum area surface area is maximized for maximum area surface of the case of the cell area maximum surface the first of the other cases, approximately And further comprising a plurality of second cells arranged vertically.
It said second unit cells of the first unit cell than the number arranged in succession are disposed so as it is increased number continuously lined up, the power storage device according to claim 1 or 2. The power storage device according to claim 1, wherein the single battery includes an all-solid battery having a solid positive electrode layer, a solid electrolyte layer, and a solid negative electrode layer.

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