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

Technical Field

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

Background Art

[0002] Conventionally, in addition to batteries using a liquid electrolyte, all-solid-state batteries using a solid electrolyte are known. Since an all-solid-state battery is composed of a laminate in which a positive electrode, a solid electrolyte, and a negative electrode are laminated in this order, it is necessary to make good contact with the interfaces of the laminate. For example, in Patent Document 1, in order to stabilize the voltage during discharge of an all-solid-state battery, an all-solid-state battery that pressurizes the laminate in the lamination direction in a battery case in which the laminate is housed based on the detected voltage is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the all-solid-state battery of Patent Document 1, the laminate may be uniaxially pressurized and deformed, and there is a risk of being locally pressurized within the plane of the laminate. Local pressurization can cause cracks and fractures in the laminate.

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

Means for Solving the Problems

[0006] A pressurizing mechanism for an all-solid-state battery according to an 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 having the fluid chamber and applying a predetermined pressure to the all-solid-state battery cell through the fluid.

[0007] With this configuration, a predetermined pressure is applied to the all-solid-state battery cell through the fluid that surrounds the entire all-solid-state battery cell, thereby enabling uniform pressurization of the entire all-solid-state battery.

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

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

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

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

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

[0013] In a pressurizing mechanism for an all-solid-state battery according to one embodiment of the present invention, the pressurizing portion may further include a bracket fixed to the 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 separated from the lower shell member.

[0014] In a pressurizing mechanism for an all-solid-state battery according to one embodiment of the present invention, the mechanism further comprises electrodes electrically connected to the all-solid-state battery cell, wherein the electrodes can be configured to penetrate the lower shell member and be exposed to the outside.

[0015] A test apparatus for a solid-state battery according to one embodiment of the present invention includes a pressurizing unit which has a first fluid chamber filled with a first fluid and applies a predetermined pressure to a solid-state battery cell via the first fluid.

[0016] In this configuration, pressure is applied to the all-solid-state battery cell through a first fluid that surrounds the entire all-solid-state battery cell, thereby enabling uniform pressurization of the entire all-solid-state battery.

[0017] In a test apparatus according to one embodiment of the present invention, the pressurizing section may 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 a test apparatus according to one embodiment of the present invention, the first fluid and the second fluid can be configured to be different fluids from each other.

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

[0020] In a test apparatus according to one embodiment of the present invention, the pressurizing portion further includes a bracket fixed to the wall surface of the first fluid chamber that faces the free piston, and the bracket can be configured to fix the all-solid-state battery cell at a position spaced apart from the facing surface.

[0021] In a test apparatus according to one embodiment of the present invention, the apparatus further comprises electrodes electrically connected to an all-solid-state battery cell, and the electrodes can be configured to penetrate the opposing surface and be exposed to the outside.

[0022] In a test apparatus according to one embodiment of the present invention, the pressurizing unit may be configured to further include a pressure adjustment unit capable of adjusting the internal pressure of the second fluid chamber. [Effects of the Invention]

[0023] According to the pressurizing mechanism and test device for all-solid-state batteries according to an embodiment of the present invention, the entire all-solid-state battery can be uniformly pressurized.

Brief Description of the Drawings

[0024] [Figure 1] It is a cross-sectional view showing an outline of the pressurizing mechanism 1 of an all-solid-state battery according to the first embodiment of the present invention. [[ID=1十一]] [Figure 2] It is an enlarged cross-sectional view showing an outline of the all-solid-state battery cell 11 attached to the pressurizing mechanism 1. [Figure 3A] It is a plan view showing an outline of the all-solid-state battery cell 11. [Figure 3B] It is a cross-sectional view showing an outline of the all-solid-state battery cell 11. [Figure 4] It is a cross-sectional view showing an outline of the pressurizing mechanism 1 of an all-solid-state battery according to the second embodiment of the present invention. [Figure 5] It is an enlarged cross-sectional view showing an outline of the all-solid-state battery cell 11 attached to the pressurizing device 1. [Figure 6A] It is a side cross-sectional view showing an outline of the test device 2 according to an embodiment of the present invention. [Figure 6B] It is a plan cross-sectional view showing an outline of the test device 2 according to an embodiment of the present invention. [Figure 7] It is an enlarged cross-sectional view showing an outline of the all-solid-state battery cell 11 attached to the test device 2.

Modes for Carrying Out the Invention

[0025] <Pressurizing Mechanism> First, the pressurizing mechanism for all-solid-state batteries according to an embodiment of the present invention will be described with reference to the drawings.

[0026] (First Embodiment of the Pressurizing Mechanism) Figure 1 is a schematic cross-sectional view of a pressurizing mechanism 1 for an all-solid-state battery according to one embodiment of the present invention. As shown in Figure 1, the pressurizing mechanism 1 for an all-solid-state battery comprises an all-solid-state battery cell 11 disposed inside a fluid chamber 121 filled with 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 Figure 1, the pressurized section 12 includes an upper shell member 122 made of cylindrical metal with an open lower end, and a lower shell member 123 made of disc-shaped metal that seals the opening of the upper shell member 122. A check valve 1221 for filling with fluid is provided on the upper 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, multiple screw holes can be formed in the upper shell member 122, multiple through holes in the lower shell member 123, and grooves for fitting O-rings can be formed in both the upper shell member 122 and the lower shell member 123. In this case, the upper shell member 122 and the lower shell member 123 can be sealed by inserting the O-rings and fastening the upper shell member 122 and the lower shell member 123 with screws.

[0028] The pressurized section 12 includes a metal bellows 124 positioned within a space formed by an upper shell member 122 and a lower shell member 123. The metal bellows 124 has a cylindrical bellows body 1241 with open ends and a bellows cap 1242 welded to one end of the bellows body 1241 to seal the opening of the bellows body 1241. Because the bellows body 1241 is constructed in a bellows-like shape with alternating peaks and valleys in the axial direction of the cylinder, the metal bellows 124 can expand and contract.

[0029] The fluid chamber 121 is configured as the internal space of a structure composed 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. Oil, being an incompressible fluid with good responsiveness, is preferred.

[0030] Furthermore, the other fluid chamber 125 is configured as the outer space within the internal space of the structure composed of the upper shell member 122 and the lower shell member 123 that is not occupied by the metal bellows 124. The fluid to be filled into the other fluid chamber 125 can be, as with the fluid chamber 121, for example, a gas such as air or nitrogen gas, or a liquid such as water or oil. When oil is filled into the fluid chamber 121, it becomes a solid-state battery. cell From the viewpoint of efficiently and uniformly pressurizing 11, nitrogen gas is preferred.

[0031] The pressurized section 12 includes brackets 126 and 127 fixed to the 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 separated from the lower shell member 123.

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

[0033] Brackets 126 and 127 are made of metal and are formed in an L-shape in cross-section, as shown in Figure 2. A metal plate 128 that supports the all-solid-state battery cell 11 is attached to the upper ends of brackets 126 and 127. The ends of brackets 126 and 127 have through holes 126a and 126a corresponding to the through holes 115a and 116a of the lead terminals 115 and 116, into which electrodes 13 and 14 are inserted. 6b is formed. The solid-state battery cell 11 can be fixed to the pressurized section 12 by inserting threaded electrodes 13 and 14 into the through holes of the solid-state battery cell 11, brackets 126 and 127, and lower shell member 123 in that order, and tightening them from below with nuts (not shown). Also, since the lead terminals 115 and 116 are shaped to conform to the L-shape in cross-section of the brackets 126 and 127, the solid-state battery cell 11 is fixed at a position separated from the lower shell member 123. From the viewpoint of sealing the fluid chamber 121 and insulating the solid-state battery cell 11 from the lower shell member 123, for example, flat washers, sealing washers, and insulating tape can be interposed between the electrodes 13 and 14 and the lead terminals 115 and 116, between the lead terminals 115 and 116 and the brackets 126 and 127, and between the brackets 126 and 127 and the lower shell member 123.

[0034] Figure 3A is a plan view showing a schematic of the all-solid-state battery cell 11. Figure 3B is a cross-sectional view showing a schematic of the all-solid-state battery cell 11. As shown in Figure 3B, the all-solid-state battery cell 11 has a laminate in which a positive electrode 111, a solid electrolyte 112, and a negative electrode 113 are stacked in order, and a packaging material 114 made of synthetic resin film that houses the laminate. The all-solid-state battery cell 11 further has one side of the positive electrode 111 and the negative electrode 11 inside the packaging material 114. 3 Each of the two sides of the packaging material has lead terminals 115 and 116 made of metal foil. The lead terminals 115 and 116 are led out from one end and the other end of the packaging material 114, respectively, while maintaining the airtight state of the packaging material. 115、116 edge department As shown in Figure 3A, through holes 115a and 116a are formed into which threaded electrodes 13 and 14 are inserted.

[0035] (Method for mounting all-solid-state battery cells in a pressurizing mechanism) First, the all-solid-state battery cell 11 is prepared, and threaded electrodes 13 and 14 are inserted into the through-holes of the all-solid-state battery cell 11, brackets 126 and 127, and lower shell member 123 in that order, and temporarily fastened with nuts. Next, the metal bellows 124 and the lower shell member 123 are welded together, and the upper shell member 122 and the lower shell member 123 are welded together. Then, since there are gaps in the through-holes 123a and 123b in the lower shell member 123 into which the threaded electrodes 13 and 14 are inserted, the nuts are not fully fastened, so oil is filled into one of the through-holes 123a and 123b, and the other through-hole 123a and 123b is used as an air vent. Once the fluid chamber 121 is sufficiently filled with oil, the nuts on the lower shell member 123 are fully fastened to fix the all-solid-state battery cell 11 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 it reaches a predetermined pressure.

[0036] (Operation of the pressurizing mechanism) Inside the fluid chamber 121, a predetermined pressure is applied to the all-solid-state battery cell 11 via the oil that surrounds the entire all-solid-state battery cell 11, thereby uniformly pressurizing the all-solid-state battery cell 11. Furthermore, when a temperature change occurs in the all-solid-state battery cell 11, the volume of the fluid chamber 121 changes, and because 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 the pressurizing mechanism) The pressurization mechanism for an all-solid-state battery according to one embodiment of the present invention has been described above, but the specific embodiments of the present invention are not limited to the above embodiment. For example, in the above embodiment, the fluid chamber 121 is composed of the lower shell member 123 and the inside of the metal bellows 124, and the other fluid chamber 125 is composed of the upper shell member 122, the lower shell member 123 and the outside of the metal bellows 124, but as shown in Figure 4, the fluid chamber 121 can be composed of the lower shell member 123, the outside of the metal bellows 124 and the upper shell member 122, and the other fluid chamber 125 can be composed of the inside of the metal bellows 124 and the lower shell member 123. In the second embodiment, the lower shell member 123 is provided with a check valve 1231 for filling with fluid.

[0038] Figure 5 is an enlarged cross-sectional view showing a schematic of a solid-state battery cell 11 attached to a modified pressurizing mechanism 1. As shown in Figure 5, through holes 122a and 122b are formed in the upper shell member 122, corresponding to the through holes 115a and 116a of the lead terminals 115 and 116 of the solid-state battery cell 11, into which threaded electrodes 13 and 14 are inserted.

[0039] (Method for mounting all-solid-state battery cells in a pressurizing mechanism) First, prepare the all-solid-state battery cell 11, and then the all-solid-state battery cell 11, brackets 126, 127, and upper shell member 12 2 In that order, threaded electrodes 13 and 14 are inserted into their respective through holes and temporarily fastened with nuts. Next, the metal bellows 124 and the lower shell member 123 are welded together, and the upper shell member 122 and the lower shell member 123 are welded together. Then, since there are gaps in the through holes 122a and 122b in the upper shell member 122 into which the threaded electrodes 13 and 14 are inserted, the nuts are not fully fastened, so oil is filled into one of the through holes 122a and 122b, and the other through hole 122a and 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 to fix the all-solid-state battery cell 11 to the upper shell member 122. Finally, nitrogen gas is filled into the other fluid chamber 125 from the check valve 1231 of the lower shell member 123 until it reaches a predetermined pressure.

[0040] (Operation of the pressurizing mechanism) Inside the fluid chamber 121, a predetermined pressure is applied to the solid-state battery cell 11 via the oil that surrounds the entire solid-state battery cell 11, thereby uniformly pressurizing the solid-state battery cell 11. When a temperature change occurs in the solid-state battery cell 11, the volume of the fluid chamber 121 changes, and because 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 solid-state battery cell 11, the entire solid-state battery cell 11 can be uniformly pressurized. In the second embodiment, the movement of the metal bellows 124 is the opposite of that of the metal bellows 124 in the first embodiment.

[0041] <Test equipment> Next, a test 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 the test apparatus) Figure 6A is a schematic side cross-sectional view of the all-solid-state battery test apparatus 2. Figure 6B is a schematic top cross-sectional view of the all-solid-state battery test apparatus 2. In Figure 6A, the vertical and horizontal directions are defined and explained based on these, but the orientation of the test apparatus 2 when in use is not limited to these. As shown in Figure 6A, the all-solid-state battery test apparatus 2 comprises 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 positioned 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 fluid.

[0043] As shown in Figure 6A, the pressurizing section 22 consists of a first body 221 made of metal with an open right side and a hollow interior, and a second body 222 made of metal with a hollow interior that is connected to the first body 221 and communicates with the cavity of the first body 221. The first fluid chamber 2211 is formed by the first body 221 and a disc-shaped fixing part 223 that is fixed to it with bolts or the like.

[0044] Examples of the first fluid to be filled into the first fluid chamber 2211 include gases such as air and nitrogen gas, and liquids such as water and oil. From the viewpoint of providing insulation and uniformly pressurizing the all-solid-state battery cell 11, fluid paraffin is preferred.

[0045] As shown in Figure 6A, a free piston 2222 is positioned inside the second body 222, moving along the cavity of the second body 222. The space to the left of the second body 222 that is not occupied by the free piston 2222 forms the 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 equal.

[0046] Examples of the second fluid used to fill 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 fluid paraffin, the second fluid should be a fluid that exhibits little pressure fluctuation with changes in volume and temperature, and oil is preferred.

[0047] The pressurizing section 22 further includes brackets 126 and 127 fixed to the opposing surface (i.e., the fixed section 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 and 127 at a position spaced apart from the opposing surface.

[0048] Figure 7 is an enlarged plan cross-sectional view showing a schematic of the all-solid-state battery cell 11 attached to the test apparatus 2. As shown in Figure 7, through holes 223a and 223b are formed in the fixing portion 223, corresponding to the through holes 115a and 116a of the lead terminals 115 and 116 of the all-solid-state battery cell 11, into which the threaded electrodes 13 and 14 are inserted.

[0049] The pressurizing section 22 includes a pressurizing device 225 that pressurizes the second fluid chamber 2221. As shown in Figure 6A, the pressurizing device 225 is in communication with the second fluid chamber 2221 and is located to the left of the second fluid chamber 2221. From the viewpoint of easily pressurizing the all-solid-state battery cell 11, a pressurizing device 225 that includes a metal bellows inside a metal shell body is preferred. In this pressurizing device, the metal bellows is in communication with the second fluid chamber 2221, so the inside 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 with 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 with nitrogen gas from the inlet of the metal shell body, the metal bellows contracts, and the second fluid chamber 2221 can be pressurized. The pressurizing device 225 is not limited to this example, and known devices can be used.

[0050] The pressurizing section 22 includes a pressure adjustment section 226 capable of adjusting the internal pressure of the second fluid chamber 2221. As shown in Figure 6A, the pressure adjustment section 226 is in communication with the second fluid chamber 2221 and is located above the second fluid chamber 2221. The pressure adjustment section 226 is of a type that includes a grippable pressure adjustment handle 2261, a rod-shaped pressure adjustment rod 2262 connected to the pressure adjustment handle 2261 and having threads on its outer circumference, and a cylindrical adjustment section body 2263 with a hollow interior into which the pressure adjustment rod 2262 is inserted, and which has threads on its inner circumference corresponding to the threads of the pressure adjustment rod 2262. The interior of the adjustment section body 2263 is in communication with the second fluid chamber 2221, and the lower space inside the adjustment section body 2263 that is not occupied by the pressure adjustment 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 proportion of the volume occupied by the pressure adjustment rod 2262 inside the adjustment unit body 2263, and thus changing the internal pressure of the second fluid chamber 2221. Furthermore, if a pressurizing device 225 is used that includes a metal bellows inside a metal shell body, when the proportion of the volume occupied by the pressure adjustment rod 2262 inside the adjustment unit body 2263 changes, the volume inside the metal bellows changes, and accordingly the volume of the space in the metal shell body not occupied by the metal bellows also changes, and the internal pressure of the second fluid chamber 2221 changes. As a result, the internal pressure of the first fluid chamber 2211 can be adjusted.

[0051] The test apparatus 2 is equipped with a known pressure gauge 23 for measuring the pressure in the first fluid chamber 2211. As shown in Figure 6A, the pressure gauge 23 is in communication with the first fluid chamber 2211 and is located 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 for mounting all-solid-state battery cells in a test apparatus) First, prepare the all-solid-state battery cell 11, then insert the threaded electrodes 13 and 14 into the through holes of the all-solid-state battery cell 11, brackets 126 and 127, and fixing part 223 in that order, and tighten with nuts to secure the all-solid-state battery cell 11 to the fixing part 22 3 Next, the free piston 2222 is inserted into the second body 222, the pressurizing device 225 and the first body 221 are assembled to the second body 222, and the fixing part 223 is assembled to the first body 221. The adjustment unit body 2263 is also attached to the second body 222. Then, the first fluid is filled into the first body 221 through the through hole 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 into the cavity of the adjustment unit body 2263, and the pressure adjustment rod 2262 with the pressure adjustment handle 2261 attached is inserted into the adjustment unit body 2263.

[0053] (Operation of the test device) 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 monitoring 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 through the first fluid that surrounds the entire all-solid-state battery cell 11, so that the all-solid-state battery cell 11 can be pressurized uniformly. Since the all-solid-state battery cell 11 is uniformly pressurized by the fluid, it can be said that the same pressurized state as the pressurizing mechanism 1 described above can be reproduced. In this state, the performance of the all-solid-state battery cell 11 can be evaluated by measuring the voltage, etc., from the electrodes 13 and 14.

[0054] To fine-tune the pressure applied to the solid-state battery cell 11, the pressure from the pressurizing device 225 is kept constant, and the position of the pressure adjustment rod 2262 is adjusted by rotating the pressure adjustment rod 2262 using the pressure adjustment handle 2261. This changes the internal volume of the adjustment unit body 2263, which in turn changes the pressure applied to the solid-state battery cell 11 via the second fluid in the second fluid chamber 2221, the free piston 2222, and the first fluid. Furthermore, if a pressurizing device containing a metal bellows inside a metal shell 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 body not occupied by the metal bellows also changes, as does the internal pressure of the second fluid chamber 2221. As a result, the pressure applied to the solid-state battery cell 11 via the free piston 2222 and the first fluid changes. When a temperature change occurs in the all-solid-state battery cell 11, the free piston 2222 is pressurized by the second fluid chamber 2221 at a predetermined pressure, so the free piston 2222 moves while maintaining 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 pressurized uniformly. The free piston 2222 performs the function of the metal bellows 124 in the pressurization mechanism 1. [Explanation of Symbols]

[0055] 1. Pressurization mechanism for all-solid-state battery cells 11 All-solid-state battery cells 12 Pressurized section 121 Fluid chamber 122 Upper shell member 123 Lower shell member 124 Metal bellows 126, 127 brackets 13, 14 electrodes 2. Test equipment for all-solid-state batteries 22 Pressurized section 2211 1st fluid chamber 2221 2nd fluid chamber 2222 Free Piston 225 Pressurizing device 226 Pressure regulating section

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.