JP2020087572A - Support structure and installation method therefor - Google Patents

Abstract

To provide a technique capable of supporting a large load which is generated in an all-solid battery, within a small space.SOLUTION: A support structure comprises: a tabular support member; and a spring which is disposed between the support member and an all-solid battery and supports the all-solid battery. A fluid introduction hole is formed inside of the support member. The fluid introduction hole includes: a first portion extending in a thickness direction of the support member; and a second portion extending in a direction orthogonal with the thickness direction and communicating with the first portion. The spring includes a metallic bellows part which is elongated/contracted in the thickness direction of the support member, a space inside of the bellows part communicates with the fluid introduction hole of the support member, and a compressive fluid is introduced into the space inside of the bellows part via the fluid introduction hole.SELECTED DRAWING: Figure 1

Description

The technology disclosed in this specification relates to a support structure and a method for installing the support structure.

Patent Document 1 discloses a support structure for supporting a fuel cell. The support structure of Patent Document 1 includes a plate-shaped support member and a bellows arranged between the support member and the fuel cell. A fluid introduction hole extending in the plate thickness direction of the support member is formed inside the support member. The fluid introduction hole communicates with the space inside the bellows, and the compressive fluid is introduced into the space inside the bellows through the fluid introduction hole.

JP, 9-139225, A

Currently, development of all-solid-state batteries mounted on vehicles such as automobiles is in progress. The all-solid-state battery includes a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer. In an all-solid-state battery, a large load may be generated due to the volume expansion during charging. Therefore, a technique capable of supporting a large load generated in an all-solid-state battery is required. Further, when the all-solid-state battery is mounted on a vehicle, it may not be possible to secure a sufficient installation space for a support structure that supports the all-solid-state battery. In the support structure of Patent Document 1, since only the fluid introduction hole extending in the plate thickness direction of the support member is formed to introduce the compressive fluid into the space inside the bellows, for example, in order to support a large load. When a plurality of bellows is required, it is difficult to introduce the compressive fluid into the space inside all the bellows. In order to introduce the compressive fluid into the space inside all the bellows, a plurality of pipes are required, and there is a problem that the installation space of the support structure becomes large. Therefore, the present specification provides a technique capable of supporting a large load generated in an all-solid-state battery in a small space.

The support structure disclosed herein supports an all-solid-state battery including a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer. The support structure includes a plate-shaped support member and a spring that is disposed between the support member and the all-solid-state battery to support the all-solid-state battery. A fluid introduction hole is formed inside the support member. The fluid introduction hole includes a first portion extending in the plate thickness direction of the support member, and a second portion extending in a direction orthogonal to the plate thickness direction and communicating with the first portion. There is. The spring includes a metal bellows portion that expands and contracts in the plate thickness direction of the support member. A space inside the bellows portion communicates with the fluid introduction hole of the support member, and a compressive fluid is introduced into the space inside the bellows portion through the fluid introduction hole.

In an all-solid-state battery, a large load may be generated due to the volume expansion during charging. According to the above support structure, a large load can be supported by the pressure generated when the compressive fluid introduced into the space inside the bellows portion is compressed. Further, according to the above support structure, the compressive fluid can be introduced through the second portion of the fluid introduction hole along the direction orthogonal to the plate thickness direction of the support member, so that the compressive fluid is compressed only along the plate thickness direction. The support member can be made thinner and the installation space of the support structure can be made smaller than the configuration in which the sexual fluid is introduced. Therefore, a large load generated in the all-solid-state battery can be supported in a small space. Further, for example, when a plurality of bellows is required to support a large load, the space inside each of the plurality of bellows portions is provided via the second portion extending in the direction orthogonal to the plate thickness direction of the support member. Since the compressive fluid can be introduced, a plurality of pipes are not required and the installation space of the support structure can be reduced.

The support member may include a plurality of plate-shaped members stacked in the plate thickness direction. A part of the fluid introduction hole may be formed in at least one of the plurality of plate-shaped members. The support member and the fluid introduction hole may be formed by joining a plurality of the plate-shaped members in the plate thickness direction.

With this configuration, the fluid introduction hole can be easily formed in the support member even if the plate thickness of the support member is thin. Therefore, the support member can be made thin, and the installation space of the support structure can be made small.

The support structure may include a plurality of springs arranged between the support member and the all-solid-state battery to support the all-solid-state battery. Each of the plurality of springs may include the metal bellows portion that expands and contracts in the plate thickness direction of the support member. A space inside the bellows portion of each of the plurality of springs communicates with the fluid introduction hole of the support member, and a compressive fluid is introduced into the space inside each bellows portion through the fluid introduction hole. May be.

According to this structure, the compressive fluid can be introduced into the plurality of springs through the fluid introduction holes of one system. Therefore, the pressure control of the compressive fluid can be performed by one system.

The support member may include one plate-shaped interposition member arranged between the plurality of springs and the all-solid-state battery. A plurality of springs may support the all-solid-state battery via one intervening member.

According to this configuration, when the all-solid-state battery is supported by the plurality of springs, the load acting on each spring can be made uniform.

The all-solid-state battery may be arranged on both upper and lower sides of the support member in the plate thickness direction. The support member is disposed between the support member and the upper all-solid-state battery to support the upper all-solid-state battery, and between the support member and the lower all-solid-state battery. And a lower spring that supports the all-solid-state battery on the lower side. Each of the upper spring and the lower spring may include a metal bellows portion that expands and contracts in the plate thickness direction of the support member. Spaces inside the bellows portions of the upper spring and the lower spring communicate with the fluid introduction holes of the support member, and are compressible into spaces inside the bellows portions through the fluid introduction holes. Fluid may be introduced.

According to this structure, the all-solid-state battery can be supported on the upper and lower sides of the support member in the plate thickness direction. Therefore, many all-solid-state batteries can be supported in a small installation space.

In addition, the present specification discloses a method of installing a support structure that supports an all-solid-state battery including a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer. The support structure includes a plate-shaped support member and a spring disposed between the support member and the all-solid-state battery to support the all-solid-state battery. A fluid introduction hole is formed inside the support member. The fluid introduction hole includes a first portion extending in the plate thickness direction of the support member, and a second portion extending in a direction orthogonal to the plate thickness direction and communicating with the first portion. There is. The spring includes a metal bellows portion that expands and contracts in the plate thickness direction of the support member. A space inside the bellows portion communicates with the fluid introduction hole of the support member. The installation method includes a first step of arranging the support structure with respect to the all-solid-state battery in a state where the bellows portion is contracted in the plate thickness direction of the support member, and the fluid introduction after the first step. A second step of introducing a compressive fluid into the space inside the bellows portion through a hole.

According to this configuration, since the compressive fluid is not introduced into the space inside the bellows portion in the first step, the bellows portion can be easily expanded and contracted in the plate thickness direction of the support member. Therefore, even if the space is small, the support structure can be easily arranged in the small space. Further, in the second step, since the compressive fluid is introduced into the space inside the bellows portion with the spring arranged between the support member and the all-solid-state battery, the compressible fluid can be introduced easily. .. According to the above configuration, the support structure can be easily installed even in a small installation space.

It is sectional drawing of the support structure which concerns on 1st Example. It is a top view of the spring of the support structure which concerns on 1st Example (it is a II-II sectional view of FIG. 1). FIG. 3 is an enlarged view of a part III of FIG. 1. FIG. 4 is an enlarged view of part IV of FIG. 3. It is an exploded perspective view of the lower side support member of the support structure concerning a 1st example. It is sectional drawing of the support structure which concerns on 2nd Example. It is sectional drawing of the support structure which concerns on 3rd Example. It is a disassembled perspective view of the lower side support member of the support structure which concerns on 3rd Example. It is sectional drawing of the support structure which concerns on 4th Example. It is sectional drawing of the support structure which concerns on 5th Example. It is a top view of the support structure concerning 6th Example. It is a figure corresponding to FIG. 3 of the spring which concerns on another Example. It is a figure corresponding to FIG. 3 of the spring which concerns on another Example. It is a figure corresponding to FIG. 4 of the spring which concerns on another Example. It is sectional drawing of the support structure which concerns on 7th Example. It is sectional drawing of the support structure which concerns on 8th Example. It is a figure corresponding to FIG. 2 of the spring which concerns on another Example. It is a figure corresponding to FIG. 3 of the spring which concerns on another Example. FIG. 9 is a view corresponding to FIG. 8 of a spring according to another embodiment. FIG. 9 is a view corresponding to FIG. 8 of a spring according to another embodiment. It is a figure corresponding to FIG. 5 of the spring which concerns on another Example.

(First embodiment)
As shown in FIG. 1, the support structure 3 according to the first embodiment supports the all-solid-state battery 10. First, the all-solid-state battery 10 will be described. The all-solid-state battery 10 includes a plurality of battery cells (not shown). Each battery cell includes a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer (not shown). The solid electrolyte layer is arranged between the positive electrode active material layer and the negative electrode active material layer. The all-solid-state battery 10 is a battery in which the electrolyte is a solid rather than a liquid. The positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer are all solid. The positive electrode active material layer is made of, for example, a material containing an oxide of lithium (for example, lithium cobalt oxide or lithium manganate). The negative electrode active material layer is made of, for example, a material containing silicon (SiC) or carbon (C). The solid electrolyte layer is made of a material containing lithium, for example. The volume of the all-solid-state battery 10 may expand during charging. As a result, the load P acts on the support structure 3 that supports the all-solid-state battery 10.

Next, the support structure 3 will be described. The support structure 3 includes a spring 1, an upper support member 11, and a lower support member 12. The all-solid-state battery 10 is arranged above the upper support member 11. The spring 1 is arranged between the upper support member 11 and the lower support member 12.

The spring 1 of the support structure 3 includes a metal bellows portion 2. An upper support member 11 is arranged above the bellows portion 2, and a lower support member 12 is arranged below the bellows portion 2. A sealed space 51 is formed inside the bellows portion 2.

The bellows portion 2 is formed of, for example, an alloy containing iron (Fe). The metal of the bellows part 2 is not particularly limited. The bellows portion 2 expands and contracts in the axial direction (Z direction). As shown in FIG. 2, the bellows portion 2 is formed in an annular shape when viewed in the axial direction (Z direction).

As shown in FIG. 3, the bellows portion 2 includes an outer diameter portion 71 and an inner diameter portion 72. In FIG. 3, the outer diameter portion 71 and the inner diameter portion 72 of the bellows portion 2 are indicated by broken lines. The outer diameter portion 71 of the bellows portion 2 is formed in a substantially linear shape along the axial direction (Z direction) of the bellows portion 2. The outer diameter D1 of the bellows portion 2 is substantially constant along the axial direction (Z direction) of the bellows portion 2. The outer diameter D1 of the central portion 31 of the bellows portion 2 in the axial direction (Z direction) is substantially the same as the outer diameter D1 of the end portion side portion 32 located on the end portion side of the central portion 31 in the axial direction (Z direction). It is the outer diameter. The central portion 31 of the bellows portion 2 is, for example, a central portion when the bellows portion 2 is divided into three equal parts in the axial direction (Z direction), and the end portion side portion 32 is located above the central portion 31. Part and lower part.

The inner diameter portion 72 of the bellows portion 2 is formed in a substantially linear shape along the axial direction (Z direction) of the bellows portion 2. The inner diameter D2 of the bellows portion 2 is substantially constant along the axial direction (Z direction) of the bellows portion 2. The inner diameter D2 at the central portion 31 in the axial direction (Z direction) of the bellows portion 2 and the inner diameter D2 at the end portion side portion 32 located on the end portion side in the axial direction (Z direction) from the central portion 31 have substantially the same inner diameter. is there.

As shown in FIG. 4, the bellows portion 2 includes a plurality of outer protruding portions 41 and a plurality of inner protruding portions 42. The plurality of outer protruding portions 41 correspond to the outer diameter portion 71 of the bellows portion 2. The plurality of inner protruding portions 42 correspond to the inner diameter portion 72 of the bellows portion 2. The outer protruding portion 41 protrudes to the outside of the bellows portion 2. The inner protruding portion 42 protrudes inside the bellows portion 2. The bellows portion 2 includes a plurality of plate members 21. The plate member 21 has an annular shape when viewed in the axial direction (Z direction) of the bellows portion 2 (FIG. 2 ). The bellows part 2 is configured by combining a plurality of plate members 21. The plate members 21 adjacent to each other in the axial direction (Z direction) of the bellows portion 2 are joined by welding or diffusion joining, for example. In the outer protruding portion 41 of the bellows portion 2, the outer peripheral portions 61 of the plate members 21 adjacent to each other in the axial direction (Z direction) are joined. At the inner protruding portion 42 of the bellows portion 2, the inner peripheral portions 62 of the plate members 21 adjacent to each other in the axial direction (Z direction) are joined.

As shown in FIG. 1, the upper support member 11 arranged on the upper side of the bellows portion 2 is a plate-shaped member, and is fixed in a state of being in close contact with the upper end portion of the bellows portion 2. Further, the lower support member 12 arranged below the bellows portion 2 is a plate-shaped member, and is fixed in a state of being in close contact with the lower end portion of the bellows portion 2. The upper support member 11 and the lower support member 12 seal the sealed space 51. A closed space 51 is formed between the upper support member 11 and the lower support member 12. A compressive fluid is enclosed in the closed space 51. The compressible fluid sealed in the closed space 51 is a gas such as air or gas. It may also be used in combination with an incompressible fluid such as water or oil.

A fluid introduction hole 90 is formed inside the lower support member 12. The fluid introduction hole 90 has a first portion 91 extending in the thickness direction (Z direction) of the lower support member 12 and a second portion 91 extending in a direction (X direction) orthogonal to the thickness direction (Z direction). And a portion 92. The first portion 91 and the second portion 92 are in communication with each other. The first portion 91 of the fluid introduction hole 90 communicates with the closed space 51 of the spring 1. The second portion 92 of the fluid introduction hole 90 communicates with the fluid introduction passage 101 of the fluid introduction device 100 described later.

As shown in FIG. 5, the lower support member 12 includes a flat plate-shaped upper end member 121, a flat plate-shaped center member 123, and a flat plate-shaped lower end member 122. The upper end member 121, the center member 123, and the lower end member 122 are stacked in the plate thickness direction (Z direction) of the lower support member 12 and are diffusion-bonded to each other. Diffusion bonding is a technique of bonding a plurality of plate-shaped members by pressing and heating in the plate thickness direction in a state where a plurality of plate-shaped members are stacked. The lower support member 12 and the fluid introduction hole 90 are formed by joining the upper end member 121, the center member 123, and the lower end member 122. The upper end member 121 includes the first portion 91 of the fluid introduction hole 90, but does not include the second portion 92. The central member 123 includes a first portion 91 and a second portion 92 of the fluid introduction hole 90. The lower end member 122 does not include the first portion 91 and the second portion 92 of the fluid introduction hole 90.

As shown in FIG. 1, the fluid introduction device 100 includes a fluid introduction passage 101 and a sealing valve 102. The fluid introduction path 101 is connected to the fluid introduction hole 90 of the lower support member 12. The fluid introducing device 100 introduces a compressive fluid into the fluid introducing hole 90 through the fluid introducing passage 101. The fluid introduction device 100 compresses the compressive fluid by a pump (not shown) and introduces it into the fluid introduction hole 90. The compressive fluid introduced into the fluid introduction hole 90 flows through the fluid introduction hole 90 and is introduced into the closed space 51 of the spring 1. The sealing valve 102 is provided in the fluid introduction path 101 and opens and closes the fluid introduction path 101. When the sealing valve 102 is closed, the fluid introduction path 101 is closed and the fluid introduction hole 90 and the closed space 51 are closed.

In the support structure 3 described above, the load P of the all-solid-state battery 10 acts on the support structure 3 as indicated by an arrow in FIG. In addition, a large load P may act on the support structure 3 due to the volume of the all-solid-state battery 10 expanding during charging. At this time, the support structure 3 supports the load P by the pressure of the compressive fluid introduced into the closed space 51 inside the bellows portion 2 of the support structure 3.

Next, a method of installing the support structure 3 will be described. The method for installing the support structure 3 includes a first step and a second step. The second step is performed after the first step. In the first step, the support structure 3 is attached to the all-solid-state battery 10 in a state where the bellows portion 2 of the spring 1 is contracted in the plate thickness direction of the lower support member 12 (Z direction, that is, the axial direction of the bellows portion 2). Deploy. The support structure 3 is arranged below the all-solid-state battery 10. In the second step, the compressive fluid is introduced into the closed space 51 inside the bellows portion 2 through the fluid introduction hole 90 of the lower support member 12. A compressive fluid is introduced from the fluid introducing device 100 into the closed space 51 of the spring 1.

The support structure 3 according to the first embodiment has been described above. As is clear from the above description, the support structure 3 includes the plate-shaped lower support member 12, and the spring 1 that is disposed between the lower support member 12 and the all-solid-state battery 10 to support the all-solid-state battery 10. And are equipped with. A fluid introduction hole 90 is formed inside the lower support member 12. The fluid introducing hole 90 extends in the plate thickness direction (Z direction) of the lower support member 12, and the first portion 91 extends in the direction (X direction) orthogonal to the plate thickness direction (Z direction). And a second portion 92 communicating with 91. The spring 1 includes a metal bellows portion 2 that expands and contracts in the plate thickness direction (Z direction) of the lower support member 12. The closed space 51 inside the bellows portion 2 communicates with the fluid introduction hole 90 of the lower support member 12, and the compressive fluid is introduced into the space inside the bellows portion 2 through the fluid introduction hole 90.

According to the support structure 3 described above, since the load P is supported by the pressure generated when the compressive fluid introduced into the closed space 51 inside the bellows portion 2 is compressed, a large load P generated in the all-solid-state battery 10 is supported. Can be supported. Further, according to the support structure 3 described above, a direction (Z direction) orthogonal to the plate thickness direction (Z direction) of the lower support member 12 is provided through the second portion 92 of the fluid introduction hole 90 formed in the lower support member 12. The compressive fluid can be introduced along the (X direction). Therefore, as compared with the configuration in which the compressive fluid is introduced only along the plate thickness direction (Z direction) of the lower support member 12, the plate thickness of the lower support member 12 can be reduced, and the support structure 3 can have a smaller thickness. Installation space can be reduced. As a result, the large load P generated in the all-solid-state battery 10 can be supported in a small space. Moreover, by supporting the all-solid-state battery 10 by the support structure 3, expansion of the volume of the all-solid-state battery 10 during charging can be suppressed. Therefore, the positive electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer of the all-solid-state battery 10 are in good contact with each other, so that the performance of the all-solid-state battery 10 can be suppressed from being degraded.

The lower support member 12 also includes an upper end member 121, a central member 123, and a lower end member 122 that are stacked in the plate thickness direction (Z direction). A part of the first portion 91 of the fluid introduction hole 90 is formed in the upper end member 121. Further, the central member 123 is formed with a first portion 91 and a second portion 92 of the fluid introduction hole 90. The lower support member 12 and the fluid introduction hole 90 are formed by joining the upper end member 121, the center member 123, and the lower end member 122 in the plate thickness direction (Z direction). Therefore, even if the plate thickness of the lower support member 12 is thin, the fluid introduction hole 90 can be easily formed. By forming the lower support member 12 with a plurality of plate-shaped members (the upper end member 121, the central member 123, and the lower end member 122), the lower support member 12 can be made thin, and the installation space of the support structure 3 can be reduced. can do.

Although one embodiment has been described above, the specific mode is not limited to the above embodiment. In the following description, the same components as those in the above description will be designated by the same reference numerals and description thereof will be omitted.

In the above embodiment, in the method of installing the support structure 3, after the bellows portion 2 of the spring 1 is contracted in the axial direction (Z direction) in the first step, the closed space 51 inside the bellows portion 2 is formed in the second step. Although the compressible fluid was introduced, in the other embodiments, conversely, after introducing the compressive fluid into the closed space 51 inside the bellows portion 2 of the spring 1, the bellows portion 2 is moved in the axial direction ( It may be contracted in the Z direction).

(Second embodiment)
As shown in FIG. 6, the support structure 3 according to the second embodiment includes a plurality of springs 1, a plurality of upper support members 11, and a plurality of lower support members 12. Further, the support structure 3 includes a flat plate-shaped intermediate support member 50 (an example of an intervening member). One intermediate support member 50 is arranged between the plurality of springs 1 and one all-solid-state battery 10. The single intermediate support member 50 is arranged across the plurality of springs 1. The all-solid-state battery 10 is arranged above the intermediate support member 50. One all-solid-state battery 10 is supported by the plurality of springs 1 via one intermediate support member 50. The plurality of springs 1 are arranged side by side at intervals in the direction (X direction) orthogonal to the plate thickness direction of the intermediate support member 50.

According to this configuration, when the one all-solid-state battery 10 is supported by the plurality of springs 1, the load acting on the plurality of springs 1 becomes uniform. The all-solid-state battery 10 can be supported in good balance.

(Third embodiment)
As shown in FIG. 7, the support structure 3 according to the third embodiment includes one lower support member 12 for the plurality of springs 1. As shown in FIGS. 7 and 8, the fluid introduction hole 90 formed inside the lower support member 12 includes a plurality of first portions 91 and a plurality of second portions 92. Each of the plurality of first portions 91 of the fluid introduction hole 90 communicates with each closed space 51 of each of the plurality of springs 1. The second portion 92 is formed between the first portion 91 and the first portion 91. The second portion 92 at the end of the fluid introduction hole 90 communicates with the fluid introduction path 101 of the fluid introduction device 100.

According to this configuration, the compressive fluid can be introduced into the plurality of closed spaces 51 by the one-system fluid introduction hole 90. Therefore, the pressure control of the compressive fluid can be performed by one system. The pressure can be controlled easily and accurately.

(Fourth embodiment)
As shown in FIG. 9, the support structure 3 according to the fourth embodiment includes one upper support member 11 (another example of the intervening member) for the plurality of springs 1. One upper support member 11 is arranged between the plurality of springs 1 and one all-solid-state battery 10. One upper support member 11 is arranged so as to straddle the plurality of springs 1. One all-solid-state battery 10 is supported by the plurality of springs 1 via one upper support member 11. One upper support member 11 seals the sealed space 51 of the plurality of springs 1. According to this structure, the load acting on the plurality of springs 1 becomes uniform.

(Fifth embodiment)
As shown in FIG. 10, the support structure 3 according to the fifth embodiment includes a plurality of upper springs 1a and a plurality of lower springs 1b. A plurality of upper springs 1a are arranged above the lower support member 12 in the plate thickness direction (Z direction). A plurality of lower springs 1b are arranged below the lower support member 12 in the plate thickness direction (Z direction). A plurality of springs 1 (1a, 1a) are arranged on both upper and lower sides of the lower support member 12. The fluid introduction hole 90 of the lower support member 12 communicates with each closed space 51 of the plurality of springs 1 (1a, 1a). The structure above the lower support member 12 is as described in the first to fourth embodiments. The configurations above and below the lower support member 12 are the same except that they are upside down. Therefore, detailed description of the configuration below the lower support member 12 is omitted.

With this configuration, the all-solid-state battery 10 can be supported on both the upper and lower sides of the lower support member 12 in the plate thickness direction (Z direction). Therefore, many all-solid-state batteries 10 can be supported in a small installation space.

(Sixth embodiment)
As shown in FIG. 11, in the support structure 3 according to the fourth embodiment, a plurality of springs 1 are arranged in the X direction and the Y direction. Accordingly, the plurality of first portions 91 and the plurality of second portions 92 of the fluid introduction hole 90 formed in the lower support member 12 are arranged in the X direction and the Y direction. In addition, in FIG. 11, the all-solid-state battery 10 and the upper support member 11 are not shown.

(Modification)
In the above-described embodiment, the outer diameter portion 71 of the bellows portion 2 is formed in a substantially linear shape along the axial direction (Z direction) of the bellows portion 2, but in other embodiments, as shown in FIG. The outer diameter portion 71 of the bellows portion 2 may be curved. The outer diameter portion 71 of the bellows portion 2 projects outside the bellows portion 2 at a central portion 31 of the bellows portion 2 in the axial direction (Z direction). The outer diameter D1 of the bellows portion 2 changes along the axial direction (Z direction) of the bellows portion 2. The outer diameter D1 of the central portion 31 in the axial direction (Z direction) of the bellows portion 2 is smaller than the outer diameter D1 of the end portion side portion 32 located closer to the end portion in the axial direction (Z direction) than the central portion 31. Therefore, the difference between the outer diameter D1 and the inner diameter D2 in the central portion 31 in the axial direction (Z direction) of the bellows portion 2 is in the end portion side portion 32 located closer to the end portion in the axial direction (Z direction) than the central portion 31. It is larger than the difference between the outer diameter D1 and the inner diameter D2.

Further, in the above-described embodiment, the inner diameter portion 72 of the bellows portion 2 is formed in a substantially linear shape along the axial direction (Z direction) of the bellows portion 2, but in other embodiments, as shown in FIG. In addition, the inner diameter portion 72 of the bellows portion 2 may be curved. The inner diameter portion 72 of the bellows portion 2 projects inside the bellows portion 2 at the central portion 31 in the axial direction (Z direction) of the bellows portion 2. The inner diameter D2 of the bellows portion 2 changes along the axial direction (Z direction) of the bellows portion 2. The inner diameter D2 of the central portion 31 of the bellows portion 2 in the axial direction (Z direction) is smaller than the inner diameter D2 of the end portion side portion 32 located closer to the end portion in the axial direction (Z direction) than the central portion 31. Therefore, the difference between the outer diameter D1 and the inner diameter D2 in the central portion 31 in the axial direction (Z direction) of the bellows portion 2 is in the end portion side portion 32 located closer to the end portion in the axial direction (Z direction) than the central portion 31. It is larger than the difference between the outer diameter D1 and the inner diameter D2.

In the above embodiment, the outer protruding portion 41 is sharp, but in other embodiments, the outer protruding portion 41 may be curved as shown in FIG. Similarly, the inner protrusion 42 may be curved.

(Seventh embodiment)
In the seventh embodiment, as shown in FIG. 15, the bellows portion 2 includes only one outer protruding portion 41. The bellows portion 2 does not include the inner protruding portion 42. The bellows portion 2 includes a pair of upper and lower plate members 21, 21. The outer peripheral portions 61 of the plate members 21, 21 that are vertically adjacent to each other are joined together. The inner peripheral portion 62 of the upper plate member 21 is joined to the upper support member 11, and the inner peripheral portion 62 of the lower plate member 21 is joined to the lower support member 12. A sealed space 51 is formed inside the bellows portion 2.

(Eighth Example)
In the eighth embodiment, as shown in FIG. 16, the bellows portion 2 includes a plurality of plate-shaped intermediate members 81. Inside the bellows portion 2, a plurality of divided spaces 52 are formed by being divided by a plurality of intermediate members 81. A plurality of communication holes 82 are formed in each of the plurality of intermediate members 81. The plurality of divided spaces 52 communicate with each other through the plurality of communication holes 82. Inside the bellows portion 2, a closed space 51 having a plurality of divided spaces 52 is formed. The number of communication holes 82 in each intermediate member 81 may be one.

The intermediate member 81 includes an intermediate upper member 811 arranged on the upper side and an intermediate lower member 812 arranged on the lower side. The lower surface of the intermediate upper member 811 and the upper surface of the intermediate lower member 812 are joined by, for example, diffusion joining (thermocompression bonding).

A pair of upper and lower plate members 21, 21 is arranged between the intermediate members 81 adjacent to each other in the axial direction (Z direction) of the bellows portion 2. The outer peripheral portions 61 of the plate members 21, 21 that are vertically adjacent to each other are joined together. The inner peripheral portion 62 of the upper plate member 21 of the pair of plate members 21 is joined to the intermediate lower member 812 of the upper intermediate member 81. The inner peripheral portion 62 of the lower plate member 21 of the pair of plate members 21 is joined to the intermediate upper member 811 of the lower intermediate member 81. The bellows portion 2 does not include the inner protruding portion 42. A plurality of structures in which a pair of plate members 21 are joined are present along the axial direction (Z direction) of the bellows portion 2. This structure is laminated in multiple stages in the axial direction (Z direction).

In the above embodiment, the bellows portion 2 has an annular shape when viewed in the axial direction (Z direction) (see FIG. 2), but in another embodiment, as shown in FIG. 17, the bellows portion is formed. 2 may have a track shape when viewed in the axial direction (Z direction). The track shape is a concept including an oval ring shape, an elliptical ring shape, a quadrangular ring shape with rounded corners, and the like.

In the above modification, the inner diameter portion 72 of the bellows portion 2 was curved (see FIG. 13), but in another embodiment, as shown in FIG. 18, the inner diameter portion 72 of the bellows portion 2 is formed in a stepped shape. It may have been done. There is a step between the inner diameter portion 72 of the central portion 31 of the bellows portion 2 and the inner diameter portion 72 of the end portion side portion 32. The inner diameter portion 72 of the central portion 31 projects inward from the inner diameter portion 72 of the end side portion 32. The lengths of the plurality of plate members 21 in the central portion 31 in the X direction are unified. Further, the lengths of the plurality of plate members 21 in the end side portion 32 in the X direction are also unified. The length of the plate member 21 in the central portion 31 in the X direction is longer than the length of the plate member 21 in the end side portion 32 in the X direction. With this configuration, it is possible to reduce the types of plate members 21 used to manufacture the bellows portion 2.

In the above-described eighth embodiment, the intermediate member 81 of the bellows portion 2 is provided with two members, that is, an intermediate upper member 811 and an intermediate lower member 812 (see FIG. 16). As shown, the intermediate upper member 811 and the intermediate lower member 812 may be omitted, and the intermediate member 81 may be composed of one member.

In addition, in the embodiment shown in FIG. 19, the plate member 21 and the intermediate member 81 are configured as separate members, but in another embodiment, as shown in FIG. 20, the plate member 21 and the intermediate member 81 are integrated. It may be composed of members. Further, the intermediate member 81 is formed by joining a member integrated with the upper plate member 21 and a member integral with the lower plate member 21 with the intermediate member 81 interposed therebetween by diffusion bonding (thermocompression bonding). May be.

In the above-described embodiment, the lower support member 12 includes three members, that is, a flat plate-shaped upper end member 121, a central member 123, and a lower end member 122, but in other embodiments, as shown in FIG. The lower support member 12 may include two members such as a flat plate-shaped upper end member 125 and a lower end member 126. The upper end member 125 and the lower end member 126 are stacked in the plate thickness direction (Z direction) of the lower support member 12 and are diffusion-bonded to each other. The lower support member 12 and the fluid introduction hole 90 are formed by joining the upper end member 125 and the lower end member 126. The upper end member 125 includes a hole portion 93 and a groove portion 94. The hole portion 93 forms a part of the first portion 91 of the fluid introduction hole 90. The groove portion 94 forms a part of the second portion 92 of the fluid introduction hole 90. The lower end member 126 includes a recess 95 and a groove 96. The concave portion 95 forms a part of the first portion 91 of the fluid introduction hole 90. The groove portion 96 forms a part of the second portion 92 of the fluid introduction hole 90.

Specific examples of the present invention have been described above in detail, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in the present specification or the drawings exert technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Further, the technique illustrated in the present specification or the drawings can simultaneously achieve a plurality of purposes, and achieving the one purpose among them has technical utility.

1: Spring, 1a: Upper spring, 1b: Lower spring, 2: Bellows part, 3: Support structure, 10: All solid state battery, 11: Upper support member, 12: Lower support member, 50: Intermediate support member, 51: closed space, 52: divided space, 90: fluid introduction hole, 91: first portion, 92: second portion, 100: fluid introduction device, 101: fluid introduction passage, 102: sealing valve, 121: upper end member , 122: lower end member, 123: central member

Claims (6)

A support structure for supporting an all-solid-state battery comprising a positive electrode active material layer, a solid electrolyte layer and a negative electrode active material layer,
A plate-shaped support member,
A spring disposed between the support member and the all-solid-state battery to support the all-solid-state battery,
A fluid introduction hole is formed inside the support member,
The fluid introduction hole includes a first portion extending in the plate thickness direction of the support member, and a second portion extending in a direction orthogonal to the plate thickness direction and communicating with the first portion. Cage,
The spring includes a metal bellows portion that expands and contracts in the plate thickness direction of the support member,
A support structure in which a space inside the bellows portion communicates with the fluid introduction hole of the support member, and a compressive fluid is introduced into the space inside the bellows portion through the fluid introduction hole. The support structure according to claim 1, wherein
The support member includes a plurality of plate-shaped members stacked in the plate thickness direction,
A part of the fluid introduction hole is formed in at least one of the plurality of plate-shaped members,
A support structure in which the support member and the fluid introduction hole are formed by joining a plurality of the plate-shaped members in the plate thickness direction. The support structure according to claim 1 or 2, wherein
It is provided with a plurality of the springs arranged between the support member and the all-solid-state battery to support the all-solid-state battery,
Each of the plurality of springs includes the metal bellows portion that expands and contracts in the plate thickness direction of the support member,
A space inside the bellows portion of each of the plurality of springs communicates with the fluid introduction hole of the support member, and a compressive fluid is introduced into the space inside each bellows portion through the fluid introduction hole. Support structure. The support structure according to claim 3, wherein
A plate-shaped interposing member arranged between the plurality of springs and the all-solid-state battery,
A support structure in which a plurality of the springs support the all-solid-state battery via one intervening member. The support structure according to any one of claims 1 to 4,
The all-solid-state battery is arranged on both upper and lower sides of the support member in the plate thickness direction,
An upper spring that is arranged between the support member and the upper all-solid-state battery and supports the upper all-solid-state battery,
A lower spring disposed between the support member and the lower all-solid-state battery to support the lower all-solid-state battery,
Each of the upper spring and the lower spring includes the metal bellows portion that expands and contracts in the plate thickness direction of the support member,
Spaces inside the bellows portions of the upper spring and the lower spring communicate with the fluid introduction holes of the support member, and are compressible into spaces inside the bellows portions through the fluid introduction holes. A support structure into which a fluid is introduced. A method of installing a support structure for supporting an all-solid-state battery comprising a positive electrode active material layer, a solid electrolyte layer and a negative electrode active material layer,
The support structure is
A plate-shaped support member,
A spring disposed between the support member and the all-solid-state battery to support the all-solid-state battery,
A fluid introduction hole is formed inside the support member,
The fluid introduction hole includes a first portion extending in the plate thickness direction of the support member, and a second portion extending in a direction orthogonal to the plate thickness direction and communicating with the first portion. Cage,
The spring includes a metal bellows portion that expands and contracts in the plate thickness direction of the support member,
A space inside the bellows portion communicates with the fluid introduction hole of the support member,
The installation method is
A first step of disposing the support structure with respect to the all-solid-state battery in a state where the bellows portion is contracted in the plate thickness direction of the support member;
And a second step of introducing a compressive fluid into the space inside the bellows portion through the fluid introduction hole after the first step.

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