Pressure-applying mechanism and testing device for all-solid-state battery

Abstract

This pressure-applying mechanism for an all-solid-state battery comprises: an all-solid-state battery cell disposed inside a fluid chamber filled with a fluid; and a pressure-applying part that has the fluid chamber and applies a predetermined pressure to the all-solid-state battery cell via the fluid. The fluid may be oil. The predetermined pressure may be generated by applying pressure to the fluid chamber. The pressure-applying part may include an upper shell member, a lower shell member, and a metal bellows disposed in a space formed by the upper shell member and the lower shell member.

Description

Pressurization mechanism and test equipment for all-solid-state batteries

[0001] The present invention relates to a pressurizing mechanism for an all-solid-state battery.

[0002] In addition to batteries using liquid electrolytes, all-solid-state batteries using solid electrolytes have been known. All-solid-state batteries are composed of a laminate in which a positive electrode, a solid electrolyte, and a negative electrode are stacked in this order, and therefore, good contact is required between the interfaces of the laminate. For example, Patent Literature 1 discloses an all-solid-state battery in which pressure is applied to the laminate in the stacking direction within a battery case containing the laminate based on a detected voltage in order to stabilize the voltage during discharge of the all-solid-state battery.

[0003] JP 2010-205479 A

[0004] However, in the all-solid-state battery of Patent Document 1, the laminate may be deformed by uniaxial pressure, and the laminate may be locally pressurized within the plane of the laminate, which may cause cracks or fractures in the laminate.

[0005] Therefore, an object of the present invention is to provide a pressurizing mechanism and testing device for an all-solid-state battery that can apply a uniform pressure to the entire all-solid-state battery.

[0006] A pressurizing mechanism for an all-solid-state battery according to one embodiment of the present invention includes an all-solid-state battery cell disposed inside a fluid chamber filled with a fluid, and a pressurizing unit that has the fluid chamber and applies a predetermined pressure to the all-solid-state battery cell via the fluid.

[0007] According to this configuration, a predetermined pressure is applied to the all-solid-state battery cell via the fluid that encases the entire all-solid-state battery cell, so that the entire all-solid-state battery can be pressurized uniformly.

[0008] In the pressurizing mechanism of the all-solid-state battery according to one embodiment of the present invention, the fluid can be configured to be oil.

[0009] The pressurizing mechanism of the all-solid-state battery according to one embodiment of the present invention can be configured to generate the predetermined pressure by applying pressure to the fluid chamber.

[0010] In the pressurizing mechanism of the all-solid-state battery according to one embodiment of the present invention, the pressurizing unit can be configured to include an upper shell member, a lower shell member, and a metal bellows disposed in a space defined by the upper shell member and the lower shell member.

[0011] In the pressurizing mechanism of the all-solid-state battery according to one embodiment of the present invention, the fluid chamber can be configured to be composed of the lower shell member and the inside of the metal bellows.

[0012] In the pressurizing mechanism of the all-solid-state battery according to one embodiment of the present invention, the fluid chamber can be configured to be composed of the lower shell member, the outside of the metal bellows, and the upper shell member.

[0013] In the pressurizing mechanism of the all-solid-state battery according to one embodiment of the present invention, the pressurizing unit may further include a bracket fixed to an upper surface of the lower shell member, and the all-solid-state battery cell may be configured to be fixed to the bracket at a position spaced apart from the lower shell member.

[0014] The pressurizing mechanism of the all-solid-state battery according to one embodiment of the present invention may further include an electrode electrically connected to the all-solid-state battery cell, and the electrode may be configured to penetrate the lower shell member and be exposed to the outside.

[0015] An all-solid-state battery testing device according to one embodiment of the present invention includes a pressurizing unit having a first fluid chamber filled with a first fluid and applying a predetermined pressure to an all-solid-state battery cell via the first fluid.

[0016] According to this configuration, pressure is applied to the all-solid-state battery cell via the first fluid that encases the entire all-solid-state battery cell, so that the entire all-solid-state battery can be pressurized uniformly.

[0017] In a testing device according to one embodiment of the present invention, the pressurizing section can be configured to have a second fluid chamber filled with a second fluid, and a free piston disposed between the first fluid chamber and the second fluid chamber.

[0018] In the testing device according to one embodiment of the present invention, the first fluid and the second fluid may be different fluids.

[0019] The pressurizing unit may further include a pressurizing device connected to the second fluid chamber.

[0020] In a testing device according to one embodiment of the present invention, the pressurizing unit may further include a bracket fixed to an opposing surface of a wall surface of the first fluid chamber that faces the free piston, and the bracket may be configured to fix the all-solid-state battery cell at a position spaced apart from the opposing surface.

[0021] The testing device according to one embodiment of the present invention may further include an electrode electrically connected to the all-solid-state battery cell, and the electrode may be configured to penetrate the opposing surface and be exposed to the outside.

[0022] In the testing device according to one embodiment of the present invention, the pressurizing unit may be configured to further include a pressure adjusting unit that is capable of adjusting the internal pressure of the second fluid chamber.

[0023] According to the pressurizing mechanism and testing device for an all-solid-state battery according to one embodiment of the present invention, it is possible to apply pressure uniformly to the entire all-solid-state battery.

[0024] FIG. 1 is a cross-sectional view showing an outline of a pressurizing mechanism 1 for an all-solid-state battery according to a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing an outline of an all-solid-state battery cell 11 attached to the pressurizing mechanism 1. FIG. 3 is a plan view showing an outline of an all-solid-state battery cell 11. FIG. 4 is a cross-sectional view showing an outline of an all-solid-state battery cell 11. FIG. 5 is a cross-sectional view showing an outline of a pressurizing mechanism 1 for an all-solid-state battery according to a second embodiment of the present invention. FIG. 6 is an enlarged cross-sectional view showing an outline of an all-solid-state battery cell 11 attached to the pressurizing device 1. FIG. 7 is a side cross-sectional view showing an outline of a test device 2 according to an embodiment of the present invention. FIG. 8 is a plan cross-sectional view showing an outline of a test device 2 according to an embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view showing an outline of an all-solid-state battery cell 11 attached to the test device 2.

[0025] <Pressure Mechanism> First, a pressure mechanism of an all-solid-state battery according to one embodiment of the present invention will be described with reference to the drawings.

[0026] (First embodiment of pressurizing mechanism) Fig. 1 is a cross-sectional view showing an outline of a pressurizing mechanism 1 for an all-solid-state battery according to one embodiment of the present invention. As shown in Fig. 1, the pressurizing mechanism 1 for an all-solid-state battery includes an all-solid-state battery cell 11 arranged inside a fluid chamber 121 filled with a fluid, and a pressurizing unit 12 having the fluid chamber 121 and applying a predetermined pressure to the all-solid-state battery cell 11 via the fluid.

[0027] As shown in FIG. 1 , the pressurizing unit 12 includes a cylindrical upper shell member 122 made of metal with an open lower end, and a disk-shaped lower shell member 123 made of metal that seals the opening of the upper shell member 122. A check valve 1221 for filling a fluid is provided on the top surface of the upper shell member 122. The upper shell member 122 and the lower shell member 123 are welded together to form a seal. Alternatively, the upper shell member 122 may have a plurality of threaded holes, the lower shell member 123 may have a plurality of through-holes, and the upper shell member 122 and the lower shell member 123 may have grooves in which O-rings can be fitted. In this case, the upper shell member 122 and the lower shell member 123 can be sealed by inserting an O-ring and fastening the upper shell member 122 and the lower shell member 123 with screws.

[0028] Pressurizing unit 12 includes metal bellows 124 disposed in a space defined by upper shell member 122 and lower shell member 123. Metal bellows 124 has a cylindrical bellows body 1241 open at both ends, and a bellows cap 1242 welded to one end of bellows body 1241 and sealing the opening of bellows body 1241. Bellows body 1241 is configured in a bellows shape with alternating peaks and valleys formed in the axial direction of the cylinder, allowing metal bellows 124 to expand and contract.

[0029] The fluid chamber 121 is configured as an internal space of a structure made up of a lower shell member 123 and a metal bellows 124. The lower shell member 123 and the metal bellows 124 are welded together, and the opening at the other end of the metal bellows 124 is sealed. Examples of fluids that can be filled into the fluid chamber 121 include gases such as air and nitrogen gas, and liquids such as water and oil, with oil being preferred as it is an incompressible fluid and has good responsiveness.

[0030] The other fluid chamber 125 is configured as an outer space that is not occupied by the metal bellows 124 within the internal space of the structure configured by the upper shell member 122 and the lower shell member 123. Fluids filled in the other fluid chamber 125 include, as with the fluid chamber 121, gases such as air and nitrogen gas, and liquids such as water and oil. When oil is filled in the fluid chamber 121, nitrogen gas is preferred from the viewpoint of efficiently and uniformly pressurizing the all-solid-state battery 11.

[0031] The pressing unit 12 includes brackets 126 and 127 fixed to an upper surface of the lower shell member 123 , and the all-solid-state battery cell 11 is fixed to the brackets 126 and 127 at a position spaced apart from the lower shell member 123 .

[0032] 2 is an enlarged cross-sectional view showing an outline of the all-solid-state battery cell 11 attached to the pressure mechanism 1. The lower shell member 123 has through holes 123a and 123b formed therein, which correspond to through holes 115a and 116a of the lead terminals 115 and 116 of the all-solid-state battery cell 11 described below, and into which screw-shaped electrodes 13 and 14 are inserted.

[0033] The brackets 126 and 127 are made of metal and are formed in an L-shape in cross section as shown in FIG. 2 . A metal plate 128 that supports the all-solid-state battery cell 11 is coupled to the upper ends of the brackets 126 and 127. Furthermore, through holes 126a and 127b are formed at the ends of the brackets 126 and 127, corresponding to the through holes 115a and 116a of the lead terminals 115 and 116, and into which the electrodes 13 and 14 are inserted. The screw-shaped electrodes 13 and 14 are inserted into the respective through holes in the order of the all-solid-state battery cell 11, the brackets 126 and 127, and the lower shell member 123, and are tightened from below with nuts (not shown), thereby fixing the all-solid-state battery cell 11 to the pressing part 12. Furthermore, because the lead terminals 115 and 116 are shaped to fit the L-shape in cross section of the brackets 126 and 127, the all-solid-state battery cell 11 is fixed at a position spaced apart from the lower shell member 123. From the viewpoint of sealing the fluid chamber 121 and insulating the all-solid-state battery cell 11 from the lower shell member 123, for example, flat washers, sealing washers, or insulating tape may be interposed between the electrodes 13, 14 and the lead terminals 115, 116, between the lead terminals 115, 116 and the brackets 126, 127, and between the brackets 126, 127 and the lower shell member 123.

[0034] FIG. 3A is a plan view showing a schematic diagram of the all-solid-state battery cell 11. FIG. 3B is a cross-sectional view showing a schematic diagram of the all-solid-state battery cell 11. As shown in FIG. 3B , the all-solid-state battery cell 11 includes a laminate in which a positive electrode 111, a solid electrolyte 112, and a negative electrode 113 are laminated in this order, and a packaging material 114 made of a synthetic resin film that houses the laminate. The all-solid-state battery cell 11 further includes lead terminals 115, 116 made of metal foil that are connected to one side of the positive electrode 111 and one side of the negative electrode 114 inside the packaging material 114. The lead terminals 115, 116 are led out of the packaging material 114 from one end and the other end, respectively, of the packaging material 114 while maintaining the packaging material in a sealed state. As shown in FIG. 3A , through holes 115a, 116a are formed in the ends 115, 116 of the respective lead terminals, into which screw-shaped electrodes 13, 14 are inserted.

[0035] (Method of Mounting All-Solid-State Battery Cell in Pressurizing Mechanism) First, the all-solid-state battery cell 11 is prepared, and the threaded electrodes 13, 14 are inserted into the respective through holes in the order of the all-solid-state battery cell 11, brackets 126, 127, and lower shell member 123, and temporarily fastened with nuts. Next, the metal bellows 124 and the lower shell member 123 are welded, and the upper shell member 122 and the lower shell member 123 are welded. Then, since the nuts are not fully fastened in the through holes 123a, 123b in the lower shell member 123 into which the threaded electrodes 13, 14 are inserted, leaving gaps, oil is filled through one of the through holes 123a, 123b, and the other through hole 123a, 123b is used as an air vent. Once the fluid chamber 121 is sufficiently filled with oil, the nuts of the lower shell member 123 are fully fastened, and the all-solid-state battery cell 11 is fixed to the lower shell member 123. Finally, nitrogen gas is filled into the other fluid chamber 125 through the check valve 1221 of the upper shell member 122 until a predetermined pressure is reached.

[0036] (Operation of pressurizing mechanism) Inside the fluid chamber 121, a predetermined pressure is applied to the all-solid-state battery cell 11 via the oil that encases the entire all-solid-state battery cell 11, so that the all-solid-state battery cell 11 can be uniformly pressurized. When a temperature change occurs in the all-solid-state battery cell 11, the volume of the fluid chamber 121 changes, but since a predetermined pressure is applied to the metal bellows 124 via nitrogen gas inside the other fluid chamber 125, the metal bellows 124 expands and contracts at a pressure close to the predetermined pressure. In other words, even when a temperature change occurs in the all-solid-state battery cell 11, the entire all-solid-state battery cell 11 can be uniformly pressurized.

[0037] (Second Embodiment of Pressurizing Mechanism) The pressurizing mechanism of an all-solid-state battery according to one embodiment of the present invention has been described above, but specific aspects of the present invention are not limited to the above embodiment. For example, in the above embodiment, the fluid chamber 121 is formed by the lower shell member 123 and the interior of the metal bellows 124, and the other fluid chamber 125 is formed by the upper shell member 122, the lower shell member 123, and the exterior of the metal bellows 124. However, as shown in FIG. 4 , the fluid chamber 121 can be formed by the lower shell member 123, the exterior of the metal bellows 124, and the upper shell member 122, and the other fluid chamber 125 can be formed by the interior of the metal bellows 124 and the lower shell member 123. In a second embodiment, a check valve 1231 for filling a fluid is provided in the lower shell member 123.

[0038] 5 is an enlarged cross-sectional view showing an outline of the all-solid-state battery cell 11 attached to the pressure mechanism 1 according to the modified example. As shown in Fig. 5, the upper shell member 122 has through holes 122a and 122b formed therein, which correspond to the through holes 115a and 116a of the lead terminals 115 and 116 of the all-solid-state battery cell 11 and into which the screw-shaped electrodes 13 and 14 are inserted.

[0039] (Method of Mounting All-Solid-State Battery Cell in Pressurizing Mechanism) First, the all-solid-state battery cell 11 is prepared, and the threaded electrodes 13, 14 are inserted into the respective through-holes in the order of the all-solid-state battery cell 11, brackets 126, 127, and upper shell member 123, and temporarily fastened with nuts. Next, the metal bellows 124 and the lower shell member 123 are welded, and the upper shell member 122 and the lower shell member 123 are welded. Then, since the nuts are not fully fastened in the through-holes 122a, 122b in the upper shell member 122 into which the threaded electrodes 13, 14 are inserted, leaving gaps, oil is filled through one of the through-holes 122a, 122b, and the other through-hole 122a, 122b is used as an air vent. Once the fluid chamber 121 is sufficiently filled with oil, the nuts on the upper shell member 122 are fully fastened, and the all-solid-state battery cell 11 is fixed to the upper shell member 122. Finally, nitrogen gas is filled into the other fluid chamber 125 through the check valve 1231 of the lower shell member 123 until a predetermined pressure is reached.

[0040] (Operation of pressurizing mechanism) Inside the fluid chamber 121, a predetermined pressure is applied to the all-solid-state battery cell 11 via the oil that encases the entire all-solid-state battery cell 11, so the all-solid-state battery cell 11 can be uniformly pressurized. When a temperature change occurs in the all-solid-state battery cell 11, the volume of the fluid chamber 121 changes, but since a predetermined pressure is applied to the metal bellows 124 via nitrogen gas inside the other fluid chamber 125, the metal bellows 124 expands and contracts at a pressure close to the predetermined pressure. In other words, even when a temperature change occurs in the all-solid-state battery cell 11, the entire all-solid-state battery cell 11 can be uniformly pressurized. In the second embodiment, the movement of the metal bellows 124 is opposite to that of the metal bellows 124 in the first embodiment.

[0041] <Testing Apparatus> Next, a testing apparatus for an all-solid-state battery according to one embodiment of the present invention will be described with reference to the drawings.

[0042] (Configuration of Test Apparatus) FIG. 6A is a side cross-sectional view showing an outline of the all-solid-state battery test apparatus 2. FIG. 6B is a plan cross-sectional view showing an outline of the all-solid-state battery test apparatus 2. In FIG. 6A , the up-down direction and the left-right direction are defined and the description will be based on these directions, but the orientation of the test apparatus 2 during use is not limited to these directions. As shown in FIG. 6A , the all-solid-state battery test apparatus 2 includes a pressurizing unit 22 and a pressure gauge 23. The pressurizing unit 22 has a first fluid chamber 2211 filled with a first fluid, a second fluid chamber 2221 filled with a second fluid, and a free piston 2222 arranged between the first fluid chamber 2211 and the second fluid chamber 2221, and applies a predetermined pressure to the all-solid-state battery cell 11 via the fluids.

[0043] 6A, the pressurizing unit 22 is composed of a first body 221 made of hollow metal and opening to the right, and a second body 222 made of hollow metal and connected to the first body 221, communicating with the cavity of the first body 221. The first fluid chamber 2211 is formed by the first body 221 and a disk-shaped fixing part 223 fixed thereto with a bolt or the like.

[0044] Examples of the first fluid filled in the first fluid chamber 2211 include gases such as air and nitrogen gas, and liquids such as water and oil. Liquid paraffin is preferred from the viewpoint of insulating the all-solid-state battery cell 11 and uniformly pressurizing it.

[0045] 6A , a free piston 2222 that moves along the cavity of the second body 222 is disposed inside the second body 222. Inside the second body 222, the left space not occupied by the free piston 2222 forms a second fluid chamber 2221. As the free piston 2222 moves, the pressure inside the first fluid chamber 2211 and the pressure inside the second fluid chamber 2221 become the same.

[0046] Examples of the second fluid that fills the second fluid chamber 2221 include gases such as air and nitrogen gas, and liquids such as water and oil. When the first fluid is liquid paraffin, the second fluid is a fluid that exhibits little pressure fluctuation due to changes in volume or temperature, and oil is preferred.

[0047] The pressurizing unit 22 further includes brackets 126, 127 fixed to an opposing surface (i.e., the fixing unit 223) of the wall surface of the first fluid chamber 2211 that faces the free piston 2222, and the all-solid-state battery cell 11 is fixed to the brackets 126, 127 at a position spaced apart from the opposing surface.

[0048] Fig. 7 is an enlarged plan cross-sectional view showing an outline of the all-solid-state battery cell 11 attached to the test device 2. As shown in Fig. 7, the fixing portion 223 is formed with through holes 223a and 223b that correspond to the through holes 115a and 116a of the lead terminals 115 and 116 of the all-solid-state battery cell 11 and into which the screw-shaped electrodes 13 and 14 are inserted.

[0049] The pressurizing unit 22 includes a pressurizing device 225 that pressurizes the second fluid chamber 2221. As shown in FIG. 6A , the pressurizing device 225 is connected to the second fluid chamber 2221 and is provided to the left of the second fluid chamber 2221. From the viewpoint of easily pressurizing the all-solid-state battery cell 11, the pressurizing device 225 is preferably a pressurizing device including a metal bellows inside the metal shell body. In this pressurizing device, the metal bellows is connected to the second fluid chamber 2221, so that the interior of the metal bellows is filled with the same second fluid as the second fluid chamber 2221. The metal shell body is also provided with an inlet for filling nitrogen gas, and the space inside the metal shell body that is not occupied by the metal bellows is filled with nitrogen gas. By filling the nitrogen gas through the inlet of the metal shell body, the metal bellows contracts, thereby pressurizing the second fluid chamber 2221. The pressurizing device 225 is not limited to this example, and any known pressurizing device can be used.

[0050] The pressurizing unit 22 includes a pressure adjusting unit 226 that can adjust the internal pressure of the second fluid chamber 2221. As shown in FIG. 6A , the pressure adjusting unit 226 is connected to the second fluid chamber 2221 and is provided above the second fluid chamber 2221. The pressure adjusting unit 226 includes a grippable pressure adjusting handle 2261, a rod-shaped pressure adjusting rod 2262 that is connected to the pressure adjusting handle 2261 and has a threaded outer surface, and a cylindrical adjusting unit main body 2263 that has a threaded inner surface that corresponds to the thread of the pressure adjusting rod 2262 and has a hollow interior into which the pressure adjusting rod 2262 is inserted. The interior of the adjusting unit main body 2263 is connected to the second fluid chamber 2221, and the lower space inside the adjusting unit main body 2263 that is not occupied by the pressure adjusting rod 2262 is filled with the second fluid. By gripping the pressure adjustment handle 2261 and rotating the pressure adjustment rod 2262, the position of the pressure adjustment rod 2262 moves up and down, changing the volume proportion of the pressure adjustment rod 2262 within the adjustment unit main body 2263, and therefore changing the internal pressure of the second fluid chamber 2221. Furthermore, if a pressurizing device including a metal bellows within the metal shell main body is used as the pressurizing device 225, a change in the volume proportion of the pressure adjustment rod 2262 within the adjustment unit main body 2263 changes the volume within the metal bellows, and accordingly the volume of the space in the metal shell main body that is not occupied by the metal bellows also changes, changing the internal pressure of the second fluid chamber 2221. As a result, the internal pressure of the first fluid chamber 2211 can be adjusted.

[0051] The test device 2 includes a known pressure gauge 23 that measures the pressure in the first fluid chamber 2211. As shown in Fig. 6A , the pressure gauge 23 is in communication with the first fluid chamber 2211 and is provided above the first main body 221. The pressure gauge 23 can measure the pressure in the first fluid chamber 2211, i.e., the pressure applied to the all-solid-state battery cell 11.

[0052] (Method of Mounting All-Solid-State Battery Cell in Test Apparatus) First, the all-solid-state battery cell 11 is prepared, and the screw-like electrodes 13, 14 are inserted into the respective through-holes of the all-solid-state battery cell 11, brackets 126, 127, and fixing portion 223 in that order, and then tightened with nuts to fix the all-solid-state battery cell 11 to the fixing portion 222. Next, the free piston 2222 is inserted into the second body 222, and the pressurizing device 225 and the first body 221 are assembled to the second body 222, and the fixing portion 223 is assembled to the first body 221. Furthermore, the adjustment portion main body 2263 is attached to the second body 222. Then, the first fluid is filled through the through-hole in the first body 221 where the pressure gauge 23 is attached, and the pressure gauge 23 is attached to the first body 221. Furthermore, the second fluid is filled from the cavity of the adjusting portion main body 2263 , and the pressure adjusting rod 2262 to which the pressure adjusting handle 2261 is attached is inserted into the adjusting portion main body 2263 .

[0053] (Operation of Test Apparatus) When pressurizing the all-solid-state battery cell 11, the second fluid chamber 2221 is pressurized by the pressurizing device 225 until a predetermined pressure is reached while checking the pressure gauge 23. The first fluid chamber 2211 is pressurized through the second fluid chamber 2221 and the free piston 2222. Then, a predetermined pressure is applied to the all-solid-state battery cell 11 via the first fluid that envelops the entire all-solid-state battery cell 11, so that the all-solid-state battery cell 11 can be uniformly pressurized. Since the all-solid-state battery cell 11 is uniformly pressurized by the fluid, it can be said that a pressurized state similar to that of the pressurizing mechanism 1 described above can be reproduced. Then, in this state, the performance of the all-solid-state battery cell 11 can be evaluated by measuring the voltage and the like from the electrodes 13, 14.

[0054] When it is desired to finely adjust the pressure applied to the all-solid-state battery cell 11, the pressure from the pressurizing device 225 is kept constant, and the pressure adjustment rod 2262 is rotated using the pressure adjustment handle 2261 to adjust the position of the pressure adjustment rod 2262. This changes the internal volume of the adjustment unit main body 2263, and therefore the pressure applied to the all-solid-state battery cell 11 changes via the second fluid in the second fluid chamber 2221, the free piston 2222, and the first fluid. Furthermore, when a pressurizing device including a metal bellows inside the metal shell main body is used as the pressurizing device 225, the volume inside the metal bellows changes, and accordingly the volume of the space in the metal shell main body that is not occupied by the metal bellows also changes, and the internal pressure of the second fluid chamber 2221 changes, and therefore the pressure applied to the all-solid-state battery cell 11 changes via the free piston 2222 and the first fluid. When a temperature change occurs in the all-solid-state battery cell 11, the free piston 2222 moves while maintaining the predetermined pressure because the free piston 2222 is pressurized at a predetermined pressure from the second fluid chamber 2221. In other words, even when a temperature change occurs in the all-solid-state battery cell 11, the entire all-solid-state battery cell 11 can be pressurized uniformly. The free piston 2222 serves as the metal bellows 124 in the pressurizing mechanism 1.

[0055] REFERENCE SIGNS LIST 1 All-solid-state battery cell pressurizing mechanism 11 All-solid-state battery cell 12 Pressurizing unit 121 Fluid chamber 122 Upper shell member 123 Lower shell member 124 Metal bellows 126, 127 Bracket 13, 14 Electrode 2 All-solid-state battery test device 22 Pressurizing unit 2211 First fluid chamber 2221 Second fluid chamber 2222 Free piston 225 Pressurizing device 226 Pressure adjustment unit

Claims

1. A pressurizing mechanism for an all-solid-state battery comprising: an all-solid-state battery cell disposed inside a fluid chamber filled with fluid; and a pressurizing unit having the fluid chamber and applying a predetermined pressure to the all-solid-state battery cell via the fluid.

2. The pressurizing mechanism of an all-solid-state battery according to claim 1, wherein the fluid is oil.

3. A pressurizing mechanism for an all-solid-state battery according to claim 1, which generates the predetermined pressure by applying pressure to the fluid chamber.

4. The pressurizing mechanism of the all-solid-state battery according to claim 1, wherein the pressurizing unit includes an upper shell member, a lower shell member, and a metal bellows disposed within a space defined by the upper shell member and the lower shell member.

5. The pressurizing mechanism of an all-solid-state battery according to claim 4, wherein the fluid chamber is constituted by the lower shell member and the inside of the metal bellows.

6. The pressurizing mechanism of an all-solid-state battery according to claim 4, wherein the fluid chamber is constituted by the lower shell member, the exterior of the metal bellows, and the upper shell member.

7. The pressurizing mechanism for an all-solid-state battery according to claim 5, wherein the pressurizing unit further includes a bracket fixed to an upper surface of the lower shell member, and the all-solid-state battery cell is fixed to the bracket at a position spaced apart from the lower shell member.

8. The pressurizing mechanism for an all-solid-state battery according to claim 5, further comprising an electrode electrically connected to the all-solid-state battery cell, the electrode penetrating the lower shell member and exposed to the outside.

9. A testing device for an all-solid-state battery, comprising a first fluid chamber filled with a first fluid and a pressurizing unit that applies a predetermined pressure to an all-solid-state battery cell via the first fluid.

10. The testing device for an all-solid-state battery according to claim 9, wherein the pressurizing section has a second fluid chamber filled with a second fluid, and a free piston disposed between the first fluid chamber and the second fluid chamber.

11. The testing device for an all-solid-state battery according to claim 10, wherein the first fluid and the second fluid are different fluids.

12. The all-solid-state battery testing apparatus according to claim 10, wherein the pressurizing section further includes a pressurizing device connected to the second fluid chamber.

13. The testing device for an all-solid-state battery described in claim 10, wherein the pressurizing unit further includes a bracket fixed to an opposing surface of a wall surface of the first fluid chamber that faces the free piston, and the bracket fixes the all-solid-state battery cell at a position spaced apart from the opposing surface.

14. The all-solid-state battery testing device according to claim 13, further comprising an electrode electrically connected to the all-solid-state battery cell, the electrode penetrating the opposing surface and exposed to the outside.

15. The all-solid-state battery testing device according to claim 10, wherein the pressurizing unit further includes a pressure adjusting unit capable of adjusting the internal pressure of the second fluid chamber.

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