Load application device and power storage device

Abstract

[Problem] To provide a load application device and a power storage device that improve the durability and energy consumption efficiency of an all-solid battery. [Solution] A load application device 1 applies a load to a layered structure 2 of an all-solid battery. The load application device 1 is characterized by comprising a support 10, an elastic part 11 that is supported from the support 10 and generates elastic force by elastic deformation, and a force transmission part 12 that contacts the elastic part 11 and the layered structure 2, separates the force in the layering direction of the layered structure 2 from at least a portion of the elastic force inputted from the elastic part 11 and transmitted in a force transmission direction that varies in response to the expansion and contraction of the layered structure 2, and transmits the separated force to the layered structure 2.

Description

Load applying device and power storage device

[0001] The present invention relates to a load-applying device that applies a load to a laminated structure including an all-solid-state battery, and to an electricity storage device.

[0002] Currently, technology related to all-solid-state batteries is being developed as one of the next-generation batteries. To put all-solid-state batteries into practical use, it is necessary to solve issues such as the occurrence of cracks inside the battery and poor contact at the interface, and to improve the durability of all-solid-state batteries. One method for doing so is to apply a certain load to the all-solid-state battery.

[0003] Patent Documents 1 to 4 disclose techniques for maintaining the application of a load to an all-solid-state battery.

[0004] JP 2021-51862 A JP 2022-114625 A JP 2019-125455 A JP 2023-84884 A

[0005] The system disclosed in Patent Document 1 requires an energy supply to control the soft actuator to maintain a constant load on the battery, and also requires a displacement measurement device to control the load applied by the soft actuator in accordance with volumetric changes in the all-solid-state battery. For this reason, the system disclosed in Patent Document 1 has to consume part of its energy to apply the load, which poses a problem of being unable to improve energy consumption efficiency.

[0006] Furthermore, the device disclosed in Patent Document 2 requires an energy supply to control the control device that switches the spring constant of the elastic body to maintain a constant load on the battery, and also requires a measuring device to determine whether or not switching is necessary. Furthermore, there is a risk of the load changing suddenly when switching the spring constant. Therefore, the device disclosed in Patent Document 2 has a problem in that it is not possible to improve the durability and energy consumption efficiency of the all-solid-state battery.

[0007] Furthermore, according to the device disclosed in Patent Document 3, a load is applied to the battery by the elastic force of multiple springs arranged in the stacking direction over the entire stacking surface of the battery, so the amount of deformation due to battery expansion and the load due to the elastic force of the springs are in a monotonically increasing function relationship. Also, according to the device disclosed in Patent Document 4, a load is applied to the battery by deformation stress due to elastic deformation of the battery's exterior material, so the deformation stress varies depending on the amount of deformation of the exterior material. For this reason, the devices disclosed in Patent Documents 3 and 4 have a problem in that they are unable to improve the durability of all-solid-state batteries.

[0008] The present invention has been devised in view of the above-mentioned problems, and an object of the present invention is to provide a load-applying device and a power storage device that can improve the durability and energy consumption efficiency of an all-solid-state battery.

[0009] The load-applying device according to the first aspect of the present invention is a load-applying device that applies a load to a laminated structure of an all-solid-state battery, and is characterized by comprising: a support; an elastic section that is supported by the support and that elastically deforms to generate an elastic force; a force transmission section that is in contact with the elastic section and the laminated structure and that transmits the elastic force input from the elastic section in a variable force transmission direction depending on the expansion and contraction (expansion and contraction) of the laminated structure, and that divides from at least a portion of the transmitted force a force in a stacking direction of the laminated structure that is different from the direction of the elastic deformation and transmits the divided force to the laminated structure; and a force correction section that is provided on a surface of the support or the force transmission section, that has at least a portion of a surface that is inclined with respect to the stacking direction, and that corrects at least a portion of the elastic force input from the elastic section to the force transmission section by moving the elastic section on the inclined surface.

[0010] The load-applying device according to the second invention is a load-applying device that applies a load to a laminated structure of an all-solid-state battery, and is characterized by comprising: a support; an elastic portion that is supported by the support and that generates an elastic force by elastically deforming itself; and a force transmission portion that is in contact with the elastic portion and the laminated structure, that is journaled so as to be capable of rotational or swinging motion from the elastic portion, that transmits the elastic force input from the elastic portion in a variable force transmission direction by rotating or swinging motion in response to expansion and contraction of the laminated structure, and that divides a force in a stacking direction of the laminated structure that is different from the direction of elastic deformation from at least a portion of the transmitted force and transmits the divided force to the laminated structure.

[0011] The load-applying device of the third invention is characterized in that, in the second invention, it further comprises a force correction section provided on the surface of the support body or the force transmission section, which corrects at least a portion of the elastic force input from the elastic section to the force transmission section.

[0012] A load-applying device according to a fourth aspect of the present invention is any one of the first to third aspects of the present invention, characterized in that the force transmission portion contacts the elastic portion at a plurality of points.

[0013] The electricity storage device according to the fifth aspect of the present invention is characterized by including a laminated structure including an all-solid-state battery and one or more load-applying devices according to any one of the first to third aspects of the present invention.

[0014] According to the first to fourth aspects of the present invention, the load-applying device includes a force transmission unit that transmits an elastic force input from an elastic unit in a variable force transmission direction in response to the expansion and contraction of the laminated structure, and divides at least a portion of the transmitted force into a force in a stacking direction different from the direction of elastic deformation and transmits it to the laminated structure. This allows a highly stable load to be applied to the laminated structure in the stacking direction. This allows for improved durability and energy consumption efficiency of the all-solid-state battery.

[0015] In particular, according to the third aspect of the present invention, the load-applying device further includes a force correcting section provided on the surface of the support or the force transmitting section, which corrects at least a portion of the elastic force input from the elastic section to the force transmitting section. This allows a load to be applied to the stacked structure in the stacking direction with greater stability, thereby further improving the durability of the all-solid-state battery.

[0016] In particular, according to the fourth aspect of the present invention, the force transmission section receives an elastic force from one or more elastic sections that contact the force transmission section at multiple points. This allows a more stable load to be applied to the stacked structure in the stacking direction. This further improves the durability of the all-solid-state battery.

[0017] According to the fifth aspect of the present invention, the power storage device includes a force transmission unit that transmits an elastic force input from the elastic unit in a variable force transmission direction in response to expansion and contraction of the laminated structure, and divides at least a portion of the transmitted force into a force in the stacking direction and transmits it to the laminated structure. This allows a highly stable load to be applied to the laminated structure in the stacking direction. This allows for improved durability and energy consumption efficiency of the all-solid-state battery.

[0018] FIG. 1 is a schematic perspective view showing an example of the configuration of a load-applying device and a power storage device according to the first embodiment. FIG. 2 is a schematic view showing an example of the configuration of the load-applying device according to the first embodiment, where FIG. 2(a) is a side view and FIG. 2(b) is an overhead view. FIG. 3 is a schematic view showing an example of the operation of the load-applying device according to the first embodiment, where FIG. 3(a) shows the laminated structure before expansion and FIG. 3(b) shows the laminated structure after expansion. FIG. 4 is a schematic view showing an example of a load applied by the load-applying device according to the first embodiment. FIG. 5 is a schematic view showing an example of the relationship between the displacement amount in the stacking direction of the load-applying device according to the first embodiment and the load. FIG. 6 is a schematic view showing a first modified example of the configuration of the load-applying device according to the first embodiment. FIGS. 7(a) to 7(c) are schematic views showing second to fourth modified examples of the configuration of the load-applying device according to the first embodiment. FIG. 8 is a schematic perspective view showing an example of the configuration of the load-applying device and a power storage device according to the second embodiment. FIG. 9( a) is a schematic side view showing an example of the configuration of a load-applying device in the second embodiment, and FIG. 9( b) is a schematic side view showing an example of the configuration of a load-applying device in the second embodiment and a first modified example. FIG. 10 is a schematic side view showing a second modified example of the configuration of the load-applying device in the second embodiment. FIGS. 11( a) to 11(c) are schematic side views showing a third modified example of the configuration of the load-applying device in the second embodiment. FIG. 12 is a schematic view showing an example of the relationship between the displacement amount in the stacking direction of the load-applying device and the load in the first example. FIGS. 13( a) to 13(c) are schematic views showing an example of the relationship between the displacement amount in the stacking direction of the load-applying device, the correction width, and the load in the second example. FIGS. 14( a) and 14(b) are schematic views showing an example of the relationship between the displacement amount in the stacking direction of the load-applying device, the correction width, and the load in the third example.

[0019] Hereinafter, an example of a load-applying device 1 and an energy storage device 100 according to an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the direction in which the laminated structure 2 is stacked is referred to as a stacking direction X, one of the stacking orthogonal directions perpendicular to the stacking direction X is referred to as a first stacking orthogonal direction Y, and a direction perpendicular to both the stacking direction X and the first stacking orthogonal direction Y is referred to as a second stacking orthogonal direction Z. The configurations in each drawing are shown schematically for the purpose of explanation, and for example, the size of each component and the size comparison between components may differ from those shown in the drawings.

[0020] First Embodiment: Load-applying Device 1 An example of a load-applying device 1 according to the present embodiment will be described with reference to the drawings.

[0021] 1 , the load-applying device 1 is a device that applies a load to a stacked structure 2 including an all-solid-state battery stacked in a stacking direction X. The load-applying device 1 is combined with the stacked structure 2 to form a power storage device 100.

[0022] The load-applying device 1 includes, for example, a support 10, an elastic portion 11, and a force-transmitting portion 12. When the elastic portion 11 is elastically deformed, the load-applying device 1 can apply a load to the laminated structure 2 via the force-transmitting portion 12.

[0023] Such an energy storage device 100 includes a force transmission unit 12 that transmits an elastic force input from the elastic unit 11 in a variable force transmission direction according to the expansion and contraction of the laminated structure 2, using the function of the load-applying device 1, and divides at least a portion of the transmitted force into a force in the stacking direction X and transmits it to the laminated structure 2. In this case, a highly stable load can be applied to the laminated structure 2 in the stacking direction X. This can improve the durability and energy consumption efficiency of the all-solid-state battery.

[0024] <Support body 10> The support body 10 supports the elastic portion 11. The support body 10 is a hollow body capable of accommodating, for example, each component of the load-applying device 1 and the laminated structure 2, and includes a box, a rectangular cylinder, a U-shaped structure in a side view, a frame structure, etc. The support body 10 is made of a material having rigidity capable of applying a load to the laminated structure 2 when the elastic portion 11 elastically deforms, for example. The support body 10 may be configured as an exterior body that covers the periphery of the laminated structure 2, for example.

[0025] The support body 10 includes, for example, a first support plate 101, a second support plate 102, and an opposing plate 103. The first support plate 101 and the second support plate 102 extend, for example, substantially parallel to the stacking direction X and face each other at a distance in the first stacking orthogonal direction Y. The opposing plate 103 extends, for example, substantially parallel to the first stacking orthogonal direction Y and is disposed opposite the laminated structure 2. One end of the opposing plate 103 is connected to the first support plate 101, and the other end is connected to the second support plate 102. The first support plate 101, the second support plate 102, and the opposing plate 103 may have, for example, a shape in which the inner surfaces are smooth, flat, or curved.

[0026] The support 10 holds a base 111, which is made of, for example, a non-elastic material constituting the elastic portion 11 and extends substantially parallel to the first stacking orthogonal direction Y, so as to be movable in the stacking direction X. The support 10 may be provided with a rail at a portion in contact with the base 111 for loosely fitting the end of the base 111 in the stacking direction X so as to prevent the base 111 from coming off the surface of the first support plate 101 and the surface of the second support plate 102.

[0027] The support 10 has a smooth plate 104 on at least one of the inner surfaces of the sides where the first support plate 101 and the second support plate 102 face each other. That is, the support 10 sandwiches the base 111 between the smooth plates 104 so that the base 111 is movable in the stacking direction X. Here, the smooth surface refers to a surface that is approximately parallel to the stacking direction X and that hardly exerts an external force on the base 111 moving in the stacking direction X. Note that, although an example in which the smooth plate 104 is attached to the inner surface of the support 10 will be described in this embodiment, the inner surface of the support 10 may also be processed to have a smooth surface similar to the smooth plate 104.

[0028] The support 10 may support the base 111 so that it moves linearly only in the stacking direction X. In this case, a load with higher stability can be applied to the stacking structure 2 in the stacking direction X compared to when the base 111 moves two-dimensionally or three-dimensionally including the stacking direction X. This can further improve the durability of the all-solid-state battery.

[0029] The material of the support 10 is, for example, a material with a large elastic constant and that is difficult to deform, and may be plastic specified in "JIS K 6899-1" or the corresponding international standard "ISO 1043-1", carbon, glass, ceramics, various metal alloys, or composite materials thereof.

[0030] <Elastic portion 11> The elastic portion 11 is supported by the support body 10 and generates an elastic force by elastically deforming itself. As shown in Fig. 2(a) , for example, the elastic portion 11 has a base portion 111, a first sliding portion 112, a second sliding portion 113, a first fitting portion 114, a second fitting portion 115, a fixed portion 116, an elastic body 117, and a movable portion 118. Note that the components of the elastic portion 11 other than the elastic body 117 may be made of the same material as the support body 10, for example.

[0031] <Base 111> The base 111 is, for example, sandwiched by the support 10 so as to be movable in the stacking direction X. The base 111 extends in the first stacking orthogonal direction Y, for example.

[0032] The base portion 111 extends, for example, in the first stacking orthogonal direction Y, and both ends thereof are fitted into the first fitting portion 114 and the second fitting portion 115. Note that the base portion 111 may be partially widened in the stacking direction X, for example.

[0033] The shape of the base 111 may be any shape and rigidity that allows a load to be applied to the laminated structure 2 and allows the connected force transmission unit 12 to move freely on the base 111, and may be a straight rod, a curved body at least a portion of which is curved in the stacking direction X, or a spindle body at least a portion of which has a convex curved surface that protrudes in the stacking direction X. The material of the base 111 may be the same as that of the support 10, for example.

[0034] In addition, the base 111 may be provided with a rail at the part that comes into contact with the force transmission part 12 to allow the force transmission part 12 to fit loosely and move freely, for example, to prevent the connected force transmission part 12 from coming off the surface.

[0035] <First Sliding Portion 112> As shown in Fig. 1, for example, the first sliding portion 112 comes into contact with the first support plate 101 or the smooth plate 104 of the support body 10. As shown in Fig. 2(b), which is a bottom view corresponding to Fig. 2(a), for example, a roller R112 is attached to the first sliding portion 112, and the first sliding portion 112 comes into contact with the surface of the first support plate 101 or the smooth plate 104 via the roller R112. At this time, the first sliding portion 112 is slidable in the stacking direction X relative to the surface of the first support plate 101 by the rotation of the roller R112 (see Figs. 3(a) to 3(b)).

[0036] <Second Sliding Portion 113> The second sliding portion 113 comes into contact with, for example, the second support plate 102 of the support body 10. For example, a roller R113 is attached to the second sliding portion 113, and the second sliding portion 113 comes into contact with the surface of the second support plate 102 via the roller R113. At this time, the second sliding portion 113 is slidable in the stacking direction X relative to the surface of the second support plate 102 as the roller R113 rotates.

[0037] <First Fitting Portion 114> The first fitting portion 114 is fitted with one end of the base portion 111 by, for example, inserting one end of the base portion 111 and being fixed to the first sliding portion 112 via a first fixing tool B114.

[0038] <Second fitting portion 115> For example, the other end of the base 111 is inserted into the second fitting portion 115, and the second fitting portion 115 is fixed to the base 111 and the second sliding portion 113 via a second fixing device B115. At this time, the first sliding portion 112 and the second sliding portion 113 slide relative to the surface of the support body 10 in the stacking direction X, thereby allowing the base 111 to move in the stacking direction X.

[0039] <Fixing portion 116> The fixing portion 116 is an end portion that is fixed and supported. The fixing portion 116 is connected to, for example, at least one of the base portion 111, the first sliding portion 112, the second sliding portion 113, the first fitting portion 114, and the second fitting portion 115. In this case, compared to when the fixing portion 116 is fixed to the support body 10, the force transmission portion 12 can move in the stacking direction X and the first stacking orthogonal direction Y in response to the expansion and contraction of the laminated structure 2, and can apply a load with higher stability in the stacking direction X to the laminated structure 2. This can further improve the durability of the all-solid-state battery. Note that the fixing portion 116 may be fixed to, for example, the support body 10.

[0040] <Elastic body 117> The elastic body 117 elastically deforms itself to generate an elastic force. The elastic body 117 is elastically deformable, for example, in a substantially linear manner, and connects the fixed portion 116 and the movable portion 118. In this embodiment, an example will be described in which the elastic body 117 elastically deforms in a substantially linear manner in the first stacking orthogonal direction Y, but this is not limiting. The elastic portion 118 may be arranged so as to elastically deform in a substantially linear manner in a direction different from the stacking direction X.

[0041] As the elastic body 117, a known coil spring (compression coil spring, tension coil spring, torsion coil spring) that is elastically deformable in a substantially linear manner, a leaf spring, a spiral spring, a ring spring, etc. may be used. Furthermore, the material of the elastic body 117 may be a known metal spring (steel spring, copper alloy spring, nickel alloy spring) that is elastically deformable in a substantially linear manner, etc.

[0042] <Movable Part 118> The movable part 118 is a movable end part. The movable part 118 is movable in the direction of elastic deformation (elastic direction) in response to elastic deformation of the elastic body 117, for example, with the fixed part 116 as a reference.

[0043] The movable part 118 is connected to the force transmission part 12. Here, when the movable part 118 receives an external force from the force transmission part 12 in response to the expansion and contraction of the laminated structure 2, it approaches the fixed part 116. That is, the elastic body 117 is compressed by the fixed part 116 and the movable part 118 and elastically deforms. As a result, the movable part 118 receives an elastic force from the elastic body 117 in the direction of elastic deformation, and applies a reaction force to the force transmission part 12. This allows the load-applying device 1 to apply the elastic force generated by the elastic body 117 as a load to the laminated structure 2 via the force transmission part 12.

[0044] <Force transmission unit 12> The force transmission unit 12 is in contact with the elastic unit 11 and the laminated structure 2. The force transmission unit 12 transmits the elastic force input from the elastic unit 11 in the direction of elastic deformation in a force transmission direction that is variable in accordance with the expansion and contraction of the laminated structure 2. The force transmission unit 12 transmits the force in the force transmission direction, and divides at least a portion of the transmitted force into force in the stacking direction X of the laminated structure 2, which is different from the direction of elastic deformation, and transmits the force to the laminated structure 2.

[0045] The force transmission unit 12 is composed of, for example, one member or a plurality of members. The force transmission unit 12 has, for example, one or more members 121. Note that each component of the force transmission unit 12 may be made of the same material as that of the support body 10, for example.

[0046] <Member 121> The member 121 receives an elastic force from the elastic portion 11 in the direction of elastic deformation. The member 121 transmits the force in a variable force transmission direction according to the expansion and contraction of the laminated structure 2. As shown in Fig. 2(a) for example, the member 121 has a movable portion connecting portion 121a, a first arm portion 121b, and a first arm connecting portion 121c.

[0047] The movable part connecting part 121a is loosely fitted to the base part 111 so as to be movable in, for example, the extension direction of the base part 111. The movable part connecting part 121a is fixed to, for example, the movable part 118, and moves in the extension direction of the base part 111 in accordance with the movement of the movable part 118. The movable part connecting part 121a has, for example, a hollow space through which the base part 111 can be inserted, and is loosely fitted to be movable in the first stacking orthogonal direction Y by inserting the base part 111 into the hollow space. Note that the movable part connecting part 121a does not have to have, for example, a hollow space. In this case, the movable part connecting part 121a may be loosely fitted to a rail provided on the surface of the base part 111, so as to be movable in the first stacking orthogonal direction Y.

[0048] The movable part connector 121a moves linearly on the base 111, for example, only in the first stacking orthogonal direction Y relative to the base 111. In this case, a load with higher stability can be applied to the stacking direction X to the stacked structure 2 compared to when the movable part connector 121a moves two-dimensionally or three-dimensionally including the first stacking orthogonal direction Y relative to the base 111. This can further improve the durability of the all-solid-state battery.

[0049] The first arm portion 121b is, for example, a member that extends in one direction, and one end of the extension direction is connected to the base portion 111 via the movable part connecting portion 121a. The first arm portion 121b is pivotally supported by the movable part connecting portion 121a so as to rotate or swing around the movable part connecting portion 121a as an axis in response to the movement of the movable part connecting portion 121a.

[0050] An elastic force is input to the first arm portion 121b in the direction of elastic deformation from the elastic portion 11 via the movable portion connecting portion 121a. For example, the other end of the first arm portion 121b in the extension direction is in contact with the laminated structure 2, and the input elastic force can be transmitted from one end to the other end and applied as a load to the laminated structure 2.

[0051] The first arm connector 121c is connected to, for example, the other end of the first arm portion 121b in the extension direction, and connects the first arm portion 121b to the laminated structure 2 or another member of the member 121. When the first arm connector 121c connects the first arm portion 121b to the laminated structure 2, for example, it can apply the elastic force input to the first arm portion 121b to the laminated structure 2 as a load.

[0052] In the conventional device, the direction of the elastic force and the applied load are approximately the same, and the elastic force acting as a reaction force to the battery expansion is applied as a load. On the other hand, according to the present invention, the force transmission unit 12 is pivotally supported by the elastic unit 11 so as to be able to rotate or swing freely, and the elastic force input from the elastic unit 11 is transmitted in a variable force transmission direction by rotating or swinging in response to the expansion and contraction of the laminated structure 2. Furthermore, at least a portion of the transmitted force can be divided into a force in the stacking direction X of the laminated structure 2, which is different from the direction of elastic deformation, and transmitted to the laminated structure 2.

[0053] That is, the member 121 transmits the elastic force input from the elastic portion 11 in the direction of elastic deformation in a variable force transmission direction according to the expansion and contraction of the laminated structure 2, and divides at least a portion of the transmitted force into a force in the stacking direction X, which is different from the direction of elastic deformation, and transmits it to the laminated structure 2. In this case, a highly stable load can be applied to the laminated structure 2 in the stacking direction X. This can improve the durability and energy consumption efficiency of the all-solid-state battery.

[0054] Furthermore, the force-transmitting unit 12 applies a load to the laminated structure 2 at, for example, multiple points. In this case, compared to applying a load to the laminated structure 2 at a single point, it is easier to suppress the occurrence of cracks inside the all-solid-state battery due to the application of a local load. Furthermore, when the force-transmitting unit 12 is fitted or fixed to the surface of the laminated structure 2, stress on the fitted or fixed portion due to fluctuations in load can be distributed to multiple points. This makes it possible to further improve the durability of the all-solid-state battery.

[0055] The member 121 may further include, for example, a second arm portion 121d, a second arm connector 121e, a third arm portion 121f, and a third arm connector 121g. In this case, the member 121 is formed by connecting the arm portions 121b, 121d, and 121f. Specifically, one end of the second arm portion 121d in the extension direction is rotatably supported by the first arm connector 121c, and the other end of the second arm portion 121d is connected to the third arm portion 121f via the second arm connector 121e. Furthermore, one end of the third arm portion 121f in the extension direction is rotatably supported by the second arm connector 121e, and the other end of the third arm portion 121f is connected to the base 111 via the third arm connector 121g and is rotatably supported by the third arm connector 121g. The third arm connector 121g may have, for example, the same configuration as the movable connector 121a, and may be loosely fitted to the base 111 so as to be movable in the extension direction of the base 111 (first stacking orthogonal direction Y).

[0056] The member 121 may further include, for example, a roller R121. The roller R121 includes, for example, a roller R121c attached to the first arm connector 121c and a roller R121e attached to the second arm connector 121e. The member 121 includes, for example, a second arm portion 121d that contacts the surface of the laminated structure 2 via the rollers R121c and R121e. At this time, the second arm portion 121d is allowed to slide freely relative to the surface of the laminated structure 2 as the rollers R121c and R121e rotate. Here, when the laminated structure 2 expands and contracts in accordance with the expansion and contraction of the all-solid-state battery, the member 121 can apply a load to the laminated structure 2 via, for example, one end of the first arm portion 121b, both ends of the second arm portion 121d, one end of the third arm portion 121f, or the rollers R121c and R121e. In addition, the second arm portion 121d may be made freely movable along the surface of the laminated structure 2, for example, by loosely fitting at least one of the first arm connecting portion 121c and the second arm connecting portion 121e into a rail provided on the surface of the laminated structure 2.

[0057] 2(b), the other end of each of the arm portions 121b, 121d, and 121f in the extension direction may be shifted in the second stacking orthogonal direction Z from one end of the arm portions 121b, 121d, and 121f in the extension direction so as to be movable independently of one another. That is, the force transmission unit 12 applies a load to the laminated structure 2 at multiple different points in the second stacking orthogonal direction Z via the arm portions 121b, 121d, and 121f. In this case, a load with high planar stability can be applied to the laminated structure 2 in the stacking direction X. This can improve the durability and energy consumption efficiency of the all-solid-state battery.

[0058] 2A, the member 121 may further include a fourth arm portion 121b' and a fourth arm connector 121c'. The fourth arm portion 121b' has a configuration and function corresponding to that of the first arm portion 121b, and the fourth arm connector 121c' has a configuration and function corresponding to that of the first arm connector 121c.

[0059] The fourth arm portion 121b' is, for example, a member that extends in one direction, and one end of the extension direction is connected to the base portion 111 via the movable portion connecting portion 121a. The fourth arm portion 121b' is pivotally supported by the movable portion connecting portion 121a on the opposite side of the base portion 111 from the first arm portion 121b, for example, so as to rotate or swing around the movable portion connecting portion 121a in response to the movement of the movable portion connecting portion 121a.

[0060] An elastic force is input to the fourth arm portion 121b' in the direction of elastic deformation from the elastic portion 11 via the movable portion connecting portion 121a. For example, the other end of the fourth arm portion 121b' in the extension direction is in contact with the opposing plate 103, and the input elastic force can be transmitted from one end to the other end and applied as a load to the opposing plate 103.

[0061] The fourth arm connector 121c' is connected to, for example, the other end in the extension direction of the fourth arm portion 121b', and connects the fourth arm portion 121b' to the opposing plate 103 or another member of the member 121. When the fourth arm connector 121c' connects, for example, the first arm portion 121b to the opposing plate 103, it can apply the elastic force input to the fourth arm portion 121b' to the opposing plate 103 as a load.

[0062] That is, the member 121 transmits the elastic force input from the elastic portion 11 in the direction of elastic deformation in a variable force transmission direction depending on the expansion and contraction of the laminated structure 2, and divides at least a portion of the transmitted force into a force in the stacking direction X, which is different from the direction of elastic deformation, and transmits the divided force to the opposing plate 103. Here, the elastic force from the elastic portion 11 input to the movable portion connecting portion 121a is distributed to the first arm portion 121b and the fourth arm portion 121b', which tends to suppress changes in the load applied to the laminated structure 2. In this case, a more stable load can be applied to the laminated structure 2 in the stacking direction X. This makes it possible to further improve the durability and energy consumption efficiency of the all-solid-state battery.

[0063] The member 121 may further include, for example, a fifth arm portion 121d', a fifth arm connector 121e', and a sixth arm portion 121f'. The fifth arm portion 121d' has a configuration and function corresponding to the second arm portion 121d, the fifth arm connector 121e' has a configuration and function corresponding to the second arm connector 121e, and the sixth arm portion 121f' has a configuration and function corresponding to the third arm portion 121f, respectively. In this case, the member 121 is formed by connecting the arm portions 121b', 121d', and 121f'. Specifically, one end of the fifth arm portion 121d' in the extension direction is pivotally supported by the fourth arm connector 121c' so as to be rotatable, and the other end of the extension direction is connected to the sixth arm portion 121f' via the fifth arm connector 121e'. In addition, one end of the sixth arm portion 121f' in the extension direction is pivotally supported by the fifth arm connecting portion 121e' so as to be freely rotatable, and the other end of the sixth arm portion 121f' in the extension direction is connected to the base 111 via the third arm connecting portion 121g and is also pivotally supported by the third arm connecting portion 121g so as to be freely rotatable.

[0064] The rollers R121 of the member 121 may further include, for example, a roller R121c' attached to the fourth arm connector 121c' and a roller R121e' attached to the fifth arm connector 121e'. For example, the fifth arm portion 121d' of the member 121 contacts the surface of the opposing plate 103 via the rollers R121c' and R121e'. At this time, the fifth arm portion 121d' is slidable relative to the surface of the opposing plate 103 as the rollers R121c' and R121e' rotate. When the laminated structure 2 expands and contracts in accordance with the expansion and contraction of the all-solid-state battery, the member 121 can apply a load to the opposing plate 103 via, for example, one end of the fourth arm portion 121b', both ends of the fifth arm portion 121d', one end of the sixth arm portion 121f', or the rollers R121c' and R121e'. In addition, the fifth arm portion 121d' may be made freely movable along the surface of the opposing plate 103, for example, by loosely fitting at least one of the fourth arm connecting portion 121c' and the fifth arm connecting portion 121e' into a rail provided on the surface of the opposing plate 103.

[0065] <Laminated structure 2> The laminated structure 2 is a structure laminated in a lamination direction X, and includes a known all-solid-state battery. As shown in Fig. 1 , the laminated structure 2 includes a cathode material 21, a solid electrolyte 22, an anode material 23, and a protective material 24, which are laminated in the lamination direction X in a cross-sectional view.

[0066] When the load-applying device 1 applies a load to the laminated structure 2 in the stacking direction X, the positive electrode material 21 and the solid electrolyte 22 of the laminated structure 2 are pressed toward the negative electrode material 23 via the protective material 24, and as a result, good contact can be maintained at the interface between the positive electrode material 21 and the solid electrolyte 22 or at the interface between the negative electrode material 23 and the solid electrolyte 22.

[0067] First Embodiment: Operation of Load-Applying Device 1 Next, an example of the operation of the load-applying device 1 according to this embodiment will be described with reference to the drawings.

[0068] The operation of the load-applying device 1 can be broadly divided into two modes: a battery contraction mode shown in FIG. 3( a) and a battery expansion mode shown in FIG. 3( b). In FIG. 3( a) and FIG. 3( b), the elastic body 117 is omitted for the sake of explanation of each configuration. The sides of the hexagon indicated by dashed lines in FIG. 3( b) indicate the positions of the first arm portion 121b, the second arm portion 121d, and the third arm portion 121f, and the fourth arm portion 121b', the fifth arm portion 121d', and the sixth arm portion 121f', which are connected to each other in FIG. 3( a). The vertices of the hexagon indicate the positions of the movable portion connector 121a, the first arm connector 121c, the second arm connector 121e, the third arm connector 121g, the fourth arm connector 121c', and the fifth arm connector 121e', respectively, in FIG. 3( a).

[0069] 3(b), as the load-applying device 1 transitions from the battery contraction mode to the battery expansion mode, the elastic portion 11 moves in the stacking direction X. Furthermore, as the elastic portion 11 moves in the stacking direction X, the movable portion connecting portion 121a, the first arm portion 121b, the first arm connecting portion 121c, the second arm portion 121d, the second arm connecting portion 121e, the third arm portion 121f, and the third arm connecting portion 121g move in the stacking direction X. Simultaneously with the movement in the stacking direction X, the movable portion connecting portion 121a, the first arm portion 121b, the first arm connecting portion 121c, the second arm portion 121d, the second arm connecting portion 121e, the fourth arm portion 121b', the fourth arm connecting portion 121c', the fifth arm portion 121d', and the fifth arm connecting portion 121e' move in the first stacking orthogonal direction Y. Note that, during the transition from the battery contraction mode to the battery expansion mode, the support body 10 does not move in the stacking direction X or the first stacking orthogonal direction Y.

[0070] First, a detailed description will be given of the movement in the stacking direction X. As the battery transitions from the contraction mode to the expansion mode, the stacked structure 2 expands in the expansion direction of the stacking direction X (the direction from the stacked structure 2 toward the load-applying device 1).

[0071] When the laminated structure 2 expands in the expansion direction by a stacking direction displacement amount ΔH, the first arm connector 121c, the second arm 121d, and the second arm connector 121e of the force transmission unit 12 move in the expansion direction by the stacking direction displacement amount ΔH. At this time, the first arm 121b transmits the expansion direction force input to its other end in the extension direction via the first arm connector 121c to its one end in the extension direction and transmits it to the base 111 via the movable part connector 121a. The third arm 121f also transmits the expansion direction force input to its one end in the extension direction via the second arm connector 121e to its other end in the extension direction and transmits it to the base 111 via the third arm connector 121g. As a result, the movable part connector 121a, the third arm connector 121g, and the base 111 move in the expansion direction by the stacking direction displacement amount ΔI.

[0072] As the base 111 moves in the expansion direction, a force in the expansion direction also acts on the fourth arm connector 121c', the fifth arm connector 121d', and the fifth arm connector 121e', but at the same time, a normal force acts from the opposing plate 103 in the contraction direction (the direction from the load-applying device 1 toward the laminated structure 2) in the stacking direction X. Here, the fourth arm connector 121c', the fifth arm connector 121d', and the fifth arm connector 121e' do not move in the stacking direction X because the force in the expansion direction and the force in the contraction direction are balanced.

[0073] Next, the movement in the first stacking orthogonal direction Y will be described in detail.

[0074] When the third arm portion 121f transmits the force in the expanding direction input to one end in the extension direction via the second arm connector 121e to the other end in the extension direction, it divides and transmits only the force component in the extension direction to the other end, and rotates around the third arm connector 121g using the force component other than the extension direction as torque so as to approach the base portion 111. As a result, the second arm connector 121e moves in the first stacking orthogonal direction Y by a first stacking orthogonal direction displacement amount ΔJ.

[0075] In conjunction with the movement of the second arm connector 121e, the second arm portion 121d and the first arm connector 121c move by a first stacking orthogonal direction displacement amount ΔK along the surface of the laminated structure 2. In the example of Fig. 3(b) , the second arm portion 121d and the first arm connector 121c move in the first stacking orthogonal direction Y without rotating about the second arm connector 121e, and at this time ΔK = ΔJ.

[0076] The first arm portion 121b moves in the first stacking orthogonal direction Y in accordance with the movement of the first arm connector 121c in the first stacking orthogonal direction Y. Furthermore, when the first arm portion 121b transmits the force in the expansion direction input to the other end in the extension direction via the first arm connector 121c to one end in the extension direction, it divides and transmits only the force component in the extension direction to the one end, and rotates the force component other than the extension direction as torque around the movable part connector 121a as an axis so as to approach the base 111. As a result, the movable part connector 121a moves in the first stacking orthogonal direction Y by a first stacking orthogonal direction displacement ΔL. In this case, ΔL = ΔJ + ΔK.

[0077] Similarly to the rotational movement of the third arm portion 121f, when the sixth arm portion 121f' transmits a force in the contraction direction input to one end in the extension direction via the fifth arm connector 121e' to the other end in the extension direction, it divides and transmits only the force component in the extension direction to the other end, and rotates around the third arm connector 121g using the force component other than the extension direction as torque so as to approach the base portion 111. As a result, the fifth arm connector 121e' moves in the first stacking orthogonal direction Y by a first stacking orthogonal direction displacement amount ΔJ, similar to the second arm connector 121e.

[0078] In conjunction with the movement of the fifth arm connector 121e', the fifth arm portion 121d' and the fourth arm connector 121c' move by a first stacking orthogonal direction displacement amount ΔK along the surface of the opposing plate 103. In the example of Fig. 3(b) , the fifth arm portion 121d' and the fourth arm connector 121c' move in the first stacking orthogonal direction Y without rotating around the fifth arm connector 121e', and at this time ΔK = ΔJ.

[0079] The fourth arm portion 121b' moves in the first stacking orthogonal direction Y in accordance with the movement of the fourth arm connector 121c' in the first stacking orthogonal direction Y. Furthermore, when the fourth arm portion 121b' transmits the contraction direction force input to the other end in the extension direction via the fourth arm connector 121c' to one end in the extension direction, it divides and transmits only the force component in the contraction direction to the one end, and rotates around the movable part connector 121a as an axis, using the force component other than the extension direction as torque, so as to approach the base 111. As a result, the movable part connector 121a moves in the first stacking orthogonal direction Y by a first stacking orthogonal direction displacement amount ΔL.

[0080] In accordance with the movement of the movable part connector 121a, the movable part 118 moves by a first stacking orthogonal direction displacement amount ΔL along the extension direction of the base part 111. In the example of Fig. 3(b) , the movable part connector 121a moves in the first stacking orthogonal direction Y.

[0081] Elastic body 117 is compressed between movable part 118 and fixed part 116 due to the movement of movable part 118, and generates an elastic force in the direction of elastic deformation. Thereafter, the elastic force generated by elastic body 117 is transmitted to laminated structure 2 via movable part 118, movable part connecting part 121 a, first arm part 121 b, and first arm connecting part 121 c.

[0082] By the above operation, the load applying device 1 can apply a highly stable load in the stacking direction X to the stacked structure 2 .

[0083] 4, the relationship between the force F acting on the movable part connecting part 121a and the load P applied to the laminated structure 2 will be described. The angle of the extension direction of the first arm part 121b and the fourth arm part 121b′ relative to the direction of the force F is defined as α.

[0084] As shown in FIG. 4, the base 111 receives a force F in a direction from the elastic body 17 toward the movable part connecting part 121a and in a direction inclined by an angle θ with respect to the first stacking orthogonal direction Y. Ｄ (The example in FIGS. 1 to 3 shows the case where θ=0.) At this time, the movable part connecting part 121a is subjected to a force F (=F) in a direction from the elastic body 17 toward the movable part connecting part 121a in the first stacking orthogonal direction Y, for example, via the base part 111. Ｄ× cos θ). Thereafter, the movable part connecting part 121a receives a transmission direction component (F Ｂ Then, the first arm portion 121b applies a load of only 1 / 2×F / cos α to the laminated structure 2. The first arm portion 121b then ... Ｂ × sin α=½×F×tan α) is applied.

[0085] In this case, the load P is the force F Ｄ The force F in the first lamination perpendicular direction Y and the force F in the lamination direction X are Ｐ It is calculated as the sum of and as shown in equation [1].

[0086]

[0087] Next, referring to FIG. 5 , the relationship between the stacking direction displacement ΔH, which indicates the degree of expansion of the laminated structure 2, and the load P applied to the laminated structure 2 will be described. In FIG. 5 , the solid line indicates the load P of the present invention, the dashed line indicates the load P of the conventional technology, and the dashed-dotted line indicates the initial load (reference line) for each. The numerical values ​​of the stacking direction displacement ΔH and the load P shown in FIG. 5 are relative values ​​that can be compared in the same unit system, so an arbitrary unit au (arbitrary unit) can be applied. Furthermore, within the range of the stacking direction displacement ΔH shown in FIG. 5 , it is assumed that the base 111 does not contact the opposing plate 103, thereby restricting the movement of the elastic portion 11 in the stacking direction X, and the movable portion 118 does not contact the fixed portion 116, thereby restricting the movement of the elastic portion 11 in the first stacking orthogonal direction Y.

[0088] 5, the load P applied by the load-applying device 1 to the laminated structure 2 increases as the stacking direction displacement ΔH increases from 0 (au) to approximately 30 (au), then peaks at approximately 30 (au), and decreases, falling below the load P at 0 (au) when the stacking direction displacement ΔH exceeds approximately 70 (au). In other words, in the present invention, in which the direction of the elastic force by the elastic portion 11 is different from the direction of the load applied to the laminated structure 2 by the force transmission portion 12, changes in the load P are clearly suppressed compared to the prior art, in which the direction of the elastic force is the same as the direction of the load (load applied to the laminated structure 2), as shown by the dashed line in FIG.

[0089] (First embodiment: first modified example of load applying device 1) As shown in Fig. 6 , for example, the elastic part 11 has a first sliding part 112, a fixed part 116, an elastic body 117, and a movable part 118, and may not have the second sliding part 113. In this case, the force transmission part 12 may be slidable in the stacking direction X relative to the surface of the second support plate 102 instead of the second sliding part 113.

[0090] 6, the force transmission unit 12 further includes a roller R121a connected to the movable part connector 121a, and the roller R121a is slidable on the surface of the opposing plate 103 in the first stacking orthogonal direction Y. Furthermore, a roller R121e connected to the second arm connector 121e is slidable on the surface of the second support plate 102 in the stacking direction X. The dashed lines in FIG. 6 indicate the positions of the movable part connector 121a, first arm 121b, first arm connector 121c, second arm 121d, and second arm connector 121e, respectively, in the battery contraction mode, and these move in the same manner as in the example shown in FIG. 3(b).

[0091] In this case, the relationship between the force F acting on the movable part connecting portion 121a and the load P applied to the laminated structure 2 is the same as the above-mentioned formula [1]. In detail, in the above-mentioned formula [1], if θ=0 and the fourth arm portion 121b′ does not exist, this can be explained by the equation obtained as P=F×tan α.

[0092] (First Embodiment: Second Modification of Load-Applying Device 1) As shown in FIG. 7( a), for example, the load-applying device 1 may include a first load-applying device 1a including a first elastic body 117a (elastic body 117) and a second load-applying device 1b including a second elastic body 117b (elastic body 117), and the load-applying devices 1a and 1b may be arranged so as to be able to move independently. In this case, compared to the case where a single load-applying device 1 is used, a load with even higher planar stability can be applied to the stacked structure 2 in the stacking direction X. This can further improve the durability of the all-solid-state battery.

[0093] 7(b), the load-applying device 1 may include a first load-applying device 1a including a first elastic body 117a (elastic body 117) and a second load-applying device 1b including a second elastic body 117b (elastic body 117), and the load-applying devices 1a and 1b may be arranged to sandwich the laminated structure 2. In this case, the direction and amount of the load to be applied can be adjusted depending on the expansion direction of the laminated structure 2 (e.g., one of two directions parallel to the stacking direction). This can further improve the durability of the all-solid-state battery.

[0094] For example, as shown in FIG. 7( c), the load-applying device 1 may include a force transmission unit 12 that does not include the second arm portion 121d, the second arm connector 121e, the fifth arm portion 121d', and the fifth arm connector 121e', but instead includes a third arm portion 121f connected to the first arm connector 121c and a sixth arm portion 121f' connected to the fourth arm connector 121c'. The load-applying device 1 may also include an elastic body 117-1 (elastic body 117) that elastically supports the movable portion connector 121a, and an elastic body 117-2 (elastic body 117) that elastically supports the third arm connector 121g. In this case, the number of components of the force transmission unit 12 can be reduced. This improves the manufacturability and repairability of the load-applying device 1. In addition, in order to appropriately move the base 111 in the stacking direction X, the first arm connecting portion 121c may be loosely fitted to the surface of the stacked structure 2, and the fourth arm connecting portion 121c' may be loosely fitted to the surface of the opposing plate 103.

[0095] In this embodiment, an example has been described in which the elastic body 117 applies a load to the laminated structure 2 as it elastically deforms due to compression. However, the elastic body 117 may also apply a load to the laminated structure 2 as it elastically deforms due to tension by being connected to the movable part connecting part 121a, for example, between the movable part connecting part 121a and the third arm connecting part 121g.

[0096] According to this embodiment, the load-applying device 1 and the power storage device 100 include a force transmission unit 12 that transmits an elastic force input from the elastic unit 11 in a variable force transmission direction in accordance with the expansion and contraction of the laminated structure 2, and divides at least a portion of the transmitted force into a force in the stacking direction X, which is different from the direction of elastic deformation, and transmits the force to the laminated structure 2. Therefore, a highly stable load P can be applied to the laminated structure 2 in the stacking direction X. This makes it possible to improve the durability and energy consumption efficiency of the all-solid-state battery.

[0097] (Second embodiment: load-applying device 1) An example of a load-applying device 1 in this embodiment will be described with reference to the drawings. This embodiment differs from the first embodiment in that the load-applying device 1 further includes a force correction unit 13 that corrects at least a portion of the elastic force. Note that a description of the same configuration as that described above will be omitted.

[0098] 8 , the force correction unit 13 may be provided on the inner surface of the support body 10. Specifically, as the force correction unit 13, for example, an inclined plate 131 inclined with respect to the stacking direction X may be provided on the inner surface of the first support plate 101.

[0099] For example, at least a portion of the surface of the inclined plate 131 is inclined with respect to the stacking direction X, and the gap between the surface of the inclined plate 131 and the inner surface of the second support plate 102 is increased or decreased, for example, in the stacking direction X toward the stacked structure 2. Here, the wider the gap between the surface of the inclined plate 131 and the inner surface of the second support plate 102, the smaller the compressive force applied to the elastic body 117 is corrected, and conversely, the narrower the gap, the larger the compressive force applied to the elastic body 117 is corrected. Note that, in this embodiment, an example is described in which the inclined plate 131 is attached to the inner surface of the support body 10, but the inner surface of the support body 10 may also be processed to have an inclined surface similar to that of the inclined plate 131.

[0100] That is, the load-applying device 1 is provided on the surface of the support 10, has an inclined plate 131 at least partially inclined with respect to the stacking direction X, and further includes a force correcting unit 13 that corrects at least a portion of the elastic force input from the elastic unit 11 to the force transmitting unit 12 as the elastic unit 11 moves on the inclined plate 131. In this case, a load with even higher stability can be applied to the stacking direction X to the stacked structure 2. This can further improve the durability of the all-solid-state battery.

[0101] As shown in FIG. 9A , the inclined plate 131 has a concavely curved surface in a side view. In the example of FIG. 9A , the first sliding portion 112 is in contact with the surface of the inclined plate 131, which is designed at a predetermined inclination angle with respect to the stacking direction X. When the first sliding portion 112 moves on the surface from the initial position in the expansion direction of the laminated structure 2 (upward in FIG. 9A ), the inclined plate 131 has an enhanced correction region 131 a that enhances the elastic force of the elastic body 117 and a reduced correction region 131 b that reduces the elastic force of the elastic body 117. This is because the gap between the inclined plate 131 and the second support plate 102 decreases as the enhanced correction region 131 a moves in the expansion direction, and the gap between the inclined plate 131 and the second support plate 102 increases as the reduced correction region 131 b moves in the expansion direction. Furthermore, the inclination angle of the surface of the inclined plate 131, i.e., the inclination of the tangent to the surface, may be different within each of the enhanced correction regions 131a and the reduced correction regions 131b. Alternatively, the surface may be formed at a position shifted from the initial position in the first orthogonal direction Y by a predetermined correction width ΔY. In this case, the first sliding portion 112 receives different forces in the direction of elastic deformation from the inclined plate 131 depending on the coordinate in the stacking direction X on the surface of the inclined plate 131. Therefore, the elastic force changes depending on the inclination angle of the inclined surface. Therefore, the surface of the inclined plate 131 corresponds to the locus of the force acting point on the first sliding portion 112. By designing the inclination angle depending on the degree of expansion of the laminated structure 2, i.e., the coordinate in the stacking direction X, and forming a correction curve (correction curved surface) on the surface of the inclined plate 131, it is possible to specify a shape of the inclined plate 131 that is more likely to uniformize the load in the stacking direction X on the laminated structure 2 compared to the smooth plate 104.

[0102] 9B, the inclined plate 131 may include a region 131c in which the elastic force of the elastic body 117 does not increase or decrease from the initial position. The region 131c in which the elastic force does not increase or decrease has, for example, a linear, smooth surface whose surface is parallel to the stacking direction X in a side view, i.e., the distance between the surface of the inclined plate 131 and the second support plate 102 does not change substantially. The region 131c may include a smooth surface that is approximately parallel to the stacking direction X.

[0103] 10 , instead of an inclined plate 131, the force transmission unit 12 has an inclined surface 132 formed on the surface of a member 121 as a force correction unit 13. That is, the load application device 1 further includes a force correction unit 13 that is provided on the surface of the force transmission unit 12 and has, at least a portion of, the inclined surface 132 inclined with respect to the stacking direction X, and that corrects at least a portion of the elastic force input from the elastic unit 11 to the force transmission unit 12 as the elastic unit 11 moves on the inclined surface 132.

[0104] The elastic portion 11 contacts the force transmission portion 12 via the inclined surface 132. The elastic portion 11 further has a base linear motion guide portion 111s provided on the first support plate 101, and the fixed portion 116 is fixed to the base linear motion guide portion 111s or the first support plate 101 and does not move in the stacking direction X.

[0105] The member 121 contacts the elastic portion 11 at one end where the inclined surface 132 is formed, and contacts the second support plate 102 at the other end. The member 121 slides on the second support plate 102, allowing it to move freely in the stacking direction X but not in the first stacking orthogonal direction Y. The inclined surface 132 has an arc shape that bulges relative to the elastic portion 11 in side view. The inclination angle of the tangent of the arc relative to the extension direction of the elastic portion 11 increases to a maximum value of 90° as it moves in the contraction direction (downward in FIG. 10 ) and decreases as it moves in the expansion direction (upward in FIG. 10 ). Note that when the inclination angle is 90°, the elastic force F is applied perpendicular to the surface of the member 121, so that the force component in the stacking direction X is not transmitted to the member 121, and no load P is applied to the laminated structure 2.

[0106] In this case, the expansion of the laminated structure 2 causes the member 121 to move linearly in the stacking direction X, narrowing the gap between the surface of the inclined surface 132 and the inner surface of the first support plate 101, thereby increasing the elastic force F. Furthermore, the elastic portion 11 contacts the contraction direction side of the member 121, i.e., the surface with a larger inclination angle. As a result, the force component in the stacking direction X transmitted to the member 121 decreases, and the correction amount for reducing the load P applied to the laminated structure 2 increases. Meanwhile, contraction of the laminated structure 2 causes the elastic portion 11 to contact the surface with a smaller inclination angle. As a result, the force component in the stacking direction X transmitted to the member 121 increases, and the correction amount for reducing the load P applied to the laminated structure 2 decreases. In other words, the more the laminated structure 2 expands, the more easily the elastic force F decreases, and the more the laminated structure 2 contracts, the more difficult the elastic force F decreases. In this case, a more stable load P can be applied to the laminated structure 2 in the stacking direction X. This further improves the durability of the all-solid-state battery.

[0107] 11A, the force transmission unit 12 has a plurality of inclined surfaces 132 (first inclined surface 132a, second inclined surface 132b) formed on the surface of a member 121 as the force correction unit 13. The shapes and functions of the member 121 and the inclined surfaces 132, and the relationship between the elastic force F and the load P, are the same as those in FIG.

[0108] The elastic portion 11 has a first elastic portion 11a that contacts the first inclined surface 132a and a second elastic portion 11b that contacts the second inclined surface 132b. The first elastic portion 11a has an end fixed to the first support plate 101 and is guided to move in the first stacking orthogonal direction Y. The second elastic portion 11b has an end fixed to the second support plate 102 and is guided to move in the first stacking orthogonal direction Y.

[0109] In this case, the expansion of the laminated structure 2 causes the member 121 to move linearly in the stacking direction X, narrowing the gap between the surface of the first inclined surface 132a and the inner surface of the first support plate 101, and narrowing the gap between the surface of the second inclined surface 132b and the inner surface of the second support plate 102, thereby increasing the elastic force F. Furthermore, the first elastic portion 11a and the second elastic portion 11b contact the contraction direction side of the member 121, i.e., the surface with the larger inclination angle. As a result, the force component in the stacking direction X transmitted to the member 121 decreases, and the correction amount for reducing the load P applied to the laminated structure 2 increases. Meanwhile, the contraction of the laminated structure 2 causes the first elastic portion 11a and the second elastic portion 11b to contact the surface with the smaller inclination angle. As a result, the force component in the stacking direction X transmitted to the member 121 increases, and the correction amount for reducing the load P applied to the laminated structure 2 decreases. In other words, the more the laminated structure 2 expands, the more the elastic force F decreases, and the more the laminated structure 2 contracts, the more the elastic force F decreases. In this case, a load P with higher stability can be applied to the stacked structure 2 in the stacking direction X. This makes it possible to further improve the durability of the all-solid-state battery.

[0110] Furthermore, the force transmission unit 12 receives an elastic force from the first elastic unit 11 a and the second elastic unit 11 b, which are in contact with each other at multiple points. In this case, a load P with higher stability can be applied to the laminated structure 2 in the stacking direction. This can further improve the durability of the all-solid-state battery.

[0111] For example, as shown in FIG. 11( b), a leaf spring may be used as the elastic portion 11. In this case, the inclined surface 132 may come into contact with a leaf spring fixed to the support body 10 so as to repel in the expansion direction. Alternatively, as shown in FIG. 11( c), the inclined surface 132 may come into contact with a movable surface of a leaf spring fixed to the support body 10 so as to repel in the compression direction. The dashed lines shown in FIGS. 11( b) to 11( c) indicate the positions of the elastic portion 11 and the member 121, respectively, in the battery expansion mode.

[0112] A single cylindrical, annular, or rectangular tubular leaf spring having the same function as the first elastic portion 11 a and the second elastic portion 11 b of the leaf spring may be used as the force transmission portion 12. In this case as well, a load P with higher stability can be applied to the stacking direction X of the stacked structure 2, and the durability of the all-solid-state battery can be further improved.

[0113] In this case, a flexible or elastic material may be used for the member 121. In this case, the direction of the load P is less likely to be deviated, and the member 121 can absorb a predetermined amount of the range of expansion and contraction of the laminated structure 2 by expanding and contracting itself, and a more stable load P can be applied to the laminated structure 2 in the stacking direction X. This can further improve the durability of the all-solid-state battery.

[0114] According to this embodiment, the load-applying device 1 further includes a force correction unit 13 that is provided on the surface of the support 10 or the force transmission unit 12 and corrects at least a portion of the elastic force F input from the elastic unit 11 to the force transmission unit 12. This makes it possible to apply a more stable load P in the stacking direction X to the stacked structure 2. This makes it possible to further improve the durability of the all-solid-state battery.

[0115] Furthermore, according to this embodiment, the force transmission unit 12 receives the elastic force F from one or more elastic units 11 that contact the force transmission unit 12 at multiple points. This allows a more stable load P to be applied to the stacking direction X of the stacked structure 2. This allows for further improvement in the durability of the all-solid-state battery.

[0116] In this example, simulation results will be described for the load P relative to the stacking direction displacement ΔH when the load-applying device 1 is used, for the cases where the load-applying device 1 having the smooth plate 104 shown in FIG. 1 is used, the load-applying device 1 having the inclined plate 131 shown in FIG. 8 is used, and the load-applying device 1 having the inclined plate 131 shown in FIG. 10 is used.

[0117] In this simulation, for the example shown in FIG. 1 or FIG. 8, the angle α of the extension direction of the first arm portion 121b and the fourth arm portion 121b′ with respect to the direction of the force F is set to an initial angle α０ 10, the load P was calculated for each of the angles α of the normal direction of the inclined surface 132 with respect to the direction of the force F. ０ (Initial load P ０ ) was set, the load P was calculated for each.

[0118] The preconditions for this simulation are as follows: the length L of the first arm portion 121b, the second arm portion 121d, the third arm portion 121f, the fourth arm portion 121b', the fifth arm portion 121d', and the sixth arm portion 121f' of the force transmission portion 12; Ａ The initial compression amount (initial length) L of the movable part 118 of the elastic part 11 was set to 100 (au). ０ is 20 (au), the spring constant k is 0.3 (au), and the initial spring elastic force F ０ is set to 6 (au). At this time, the initial angle α ０ Initial load P at = 40 (°) ０ The above-mentioned "initial" refers to the value when the displacement ΔH in the stacking direction is 0 (au).

[0119] Furthermore, the displacement amount ΔH in the stacking direction, the displacement amount ΔI of the movable part connecting part 121a in the stacking direction, the displacement amount ΔL of the movable part connecting part 121a in the first stacking orthogonal direction, the elastic force F of the elastic body 117, and the correction width ΔY were calculated based on the following [Equation 2] to [Equation 10]. Note that the "2" in [Equation 2] and [Equation 4] and the "½" in [Equation 3] are based on the fact that the angles of the extension directions of the first arm part 121b and the fourth arm part 121b' with respect to the force transmitting part 12 change while maintaining the same angle α. [Equation 7] is calculated based on the fact that the load P is the initial load P ０ For [Equation 8], the load P in [Equation 7] is substituted into [Equation 1], and the force F in [Equation 1] is Ｄ[Equation 5] was substituted for [Equation 5], and [Equation 4] was substituted for the first lamination perpendicular direction displacement ΔL in [Equation 5], and both sides were multiplied by 2 / k to derive [Equation 9]. [Equation 8] was derived by rearranging it as a quadratic equation of ΔY. [Equation 10] was derived by applying the solution formula to [Equation 9] as a solution for ΔY.

[0120]

[0121] Example 1: When the load-applying device 1 of FIG. 1 is used The simulation results when the load-applying device 1 having the smooth plate 104 as shown in FIG. 1 is used are shown in FIG. 12. According to FIG. 12, the initial angle α ０ The load P is suppressed from a peak at a predetermined value according to the load applied by the load applying device 1. The load applying device 1 also adjusts the initial angle α according to the allowable amount of the displacement ΔH in the stacking direction. ０ By setting the load P, the range of the load P applied to the laminated structure 2 can be controlled.

[0122] As described above, the load applying device 1 can suppress changes in the load P compared to the conventional technology in which the direction of the elastic force and the direction of the load are the same, and can apply a highly stable load in the stacking direction X to the stacked structure 2. This can improve the durability and energy consumption efficiency of the all-solid-state battery. ０ The change in the load P can be further suppressed according to the setting of the load P, and a load with higher stability can be applied to the stacked structure 2 in the stacking direction X. This makes it possible to further improve the durability of the all-solid-state battery.

[0123] Example 2: When the load-applying device 1 shown in FIG. 8 is used As shown in FIG. 8, when the load-applying device 1 having the inclined plate 131 is used, the initial angle α ０ The load P was calculated for each of the angles α = 30 (°), 35 (°), 40 (°), and 45 (°). The inclined plate 131 is designed so that the correction width ΔY corresponding to the displacement amount ΔH in the stacking direction according to the initial angle is as shown in FIG. 13( a). The correction width ΔY is ０ The initial load P ０ The load P is calculated based on the angle θ (see Equation 1 above) at which a load P having a value substantially equal to the load P can be applied.

[0124] 13B shows the simulation results when the load-applying device 1 having the inclined plate 131 is used. According to FIG. 13B, by applying the inclined surface 132 that satisfies the correction width ΔY shown in FIG. 13A, the initial angle α ０ In response to this, the load P does not change substantially from the initial load.

[0125] 13(c) shows the relationship between the load P (load before correction) of the load-applying device 1 shown in FIG. 1 and the load P (load after correction) and correction width ΔY of this experimental example. By applying the inclined plate 131 that satisfies the correction width ΔY shown in FIG. 13(a), the load P can be made uniform at positions where the stacking direction displacement amount ΔH is 0 to 90 (au). In other words, it can be said that the correction width ΔY shown in FIG. 13(a) is the optimal shape of the inclined surface of the inclined plate 131 that can most effectively suppress changes in the load P.

[0126] 8, it is possible to further suppress the change in the load P and to apply a load with higher stability in the stacking direction X to the stacked structure 2. This makes it possible to further improve the durability of the all-solid-state battery.

[0127] <Example 3: When the load-applying device 1 of Fig. 10 is used> As shown in Fig. 10, a case will be described where a load-applying device 1 in which the elastic part 11 moves on the curved surface of the force transmission part 12 is used. In this example, in order to distinguish from the correction width ΔY in the first stacking orthogonal direction Y based on the initial position of the surface of the inclined plate 131, the correction width ΔY' in the first stacking orthogonal direction Y based on the initial position of the surface of the inclined surface 132 of the member 121 is used. More specifically, the coordinates (X, Y) on the surface of the inclined plate 131 in Fig. 10 are expressed as the reference coordinates (H ０ , Y' ０ ), and the coordinates of the force acting position are (H, Y'), the difference in the stacking direction X is the stacking direction displacement amount ΔH, and the difference in the first stacking orthogonal direction Y is the correction width ΔY'. Also, the direction in which the force F acts on the inclined surface 132 (the normal direction of the force acting point) is inclined at an angle α １ At this time, the tangential direction of the force acting point is also inclined by α １In addition, the line passing through the reference coordinate and the coordinate of the force acting position is inclined by α ２ The slope was set to be inclined only.

[0128] The load P, the elastic force F of the elastic body 117, and the correction width ΔY' were calculated based on the above-mentioned [Equation 7] and the following [Equation 11] to [Equation 15]. [Equation 14] shows the result of substituting [Equation 11] to [Equation 13] into [Equation 7]. [Equation 15] was derived as a solution to the correction width ΔY' by applying the solution formula to [Equation 14]. Note that ΔY' in [Equation 12] ０ is the Y' of the reference coordinate in the first stacking orthogonal direction Y. ０ 10 indicates the initial value of the difference (initial value of the correction width ΔY′) between the １ ) and α in [Equation 13] (α in FIG. 10 ２ ) is a case where two adjacent measurement points on the inclined surface 132 are very close to each other with respect to the load P, that is, when ΔY′, ΔL, and ΔH are all sufficiently small, α=α １ = α ２ The formula for deriving the correction width ΔY′ in [Formula 15] is the initial angle α ０ Although there is no description of the initial angle α ０ Load P = Initial load P ０ Since this corresponds to the angle α when ０ Depending on the initial load P ０ changes, and as a result, the correction width ΔY′ takes on a different value.

[0129]

[0130] According to [Equation 15], it can be seen that the correction width ΔY' is proportional to the square root of the stacking direction displacement amount ΔH, as shown in, for example, FIG. 14(a). Furthermore, by applying an inclined surface 132 that satisfies the correction width ΔY' shown in FIG. 14(a), it is possible to equalize the load P at positions where the stacking direction displacement amount ΔH is 0 to 40 (au), as shown in, for example, FIG. 14(b). In other words, it can be said that the correction width ΔY' shown in FIG. 14(a) is the optimal shape of the inclined surface of the inclined surface 132.

[0131] 10, it is possible to further suppress the change in the load P and to apply a load with higher stability in the stacking direction X to the stacked structure 2. This makes it possible to further improve the durability of the all-solid-state battery.

[0132] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims.

[0133] REFERENCE SIGNS LIST 100 Electricity storage device 1 Load applying device 10 Support 101 First support plate 102 Second support plate 103 Opposing plate 104 Smooth plate 11 Elastic portion 111 Base 112 First sliding portion 113 Second sliding portion 114 First fitting portion 115 Second fitting portion 116 Fixed portion 117 Elastic body 118 Movable portion 12 Force transmitting portion 121 Member 13 Force correcting portion 131 Inclined plate 132 Inclined surface 2 Laminated structure 21 Positive electrode material 22 Solid electrolyte 23 Negative electrode material 24 Protective material X Stacking direction Y First stacking orthogonal direction Z Second stacking orthogonal direction

Claims

1. A load-applying device that applies a load to a laminated structure of an all-solid-state battery, comprising: a support; an elastic section that is supported by the support and that generates an elastic force by elastically deforming itself; a force transmission section that is in contact with the elastic section and the laminated structure and that transmits the elastic force input from the elastic section in a variable force transmission direction according to the expansion and contraction of the laminated structure, and that divides from at least a portion of the transmitted force a force in the laminated direction of the laminated structure that is different from the direction of the elastic deformation and transmits the divided force to the laminated structure; and a force correction section that is provided on a surface of the support or the force transmission section, and has at least a portion of a surface that is inclined with respect to the laminated direction, and that corrects at least a portion of the elastic force input from the elastic section to the force transmission section as the elastic section moves on the inclined surface.

2. A load-applying device that applies a load to a laminated structure of an all-solid-state battery, comprising: a support; an elastic section that is supported by the support and that generates an elastic force by elastically deforming itself; and a force transmission section that is in contact with the elastic section and the laminated structure, that is journaled so as to be able to rotate or swing freely from the elastic section, that transmits the elastic force input from the elastic section in a variable force transmission direction by rotating or swinging in response to expansion and contraction of the laminated structure, and that divides at least a portion of the transmitted force into a force in the stacking direction of the laminated structure that is different from the direction of elastic deformation and transmits the divided force to the laminated structure.

3. A load-applying device as described in claim 2, further comprising a force correction section provided on the surface of the support or the force transmission section, which corrects at least a portion of the elastic force input from the elastic section to the force transmission section.

4. A load-applying device according to any one of claims 1 to 3, characterized in that the force transmission portion contacts the elastic portion at multiple points.

5. An electricity storage device comprising: a laminated structure including an all-solid-state battery; and one or more load-applying devices according to any one of claims 1 to 3.

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