All-solid-state secondary battery pressurized and airtight device

Abstract

We provide a pressurized and airtight device for all-solid-state secondary batteries. [Solution] A pressurized and airtight all-solid-state secondary battery device is provided, in which a first cover and a second cover are vacuum-adhered, and one or more all-solid-state secondary batteries are placed in the internal space formed by the first cover and the second cover, while protecting them from heat transfer oil, and preventing warping or bending that may occur in the secondary batteries during the WIP process. According to another embodiment of the present invention, the first pressurized surface of the pressurized and airtight all-solid-state secondary battery device according to the present invention is characterized in that it includes a groove-shaped upper surface that is recessed downward from the upper surface of the first cover.

Description

Technical Field

[0001] The present invention relates to a pressure airtight device for all-solid-state secondary batteries. More specifically, the first cover and the second cover are vacuum-adsorbed, and one or more all-solid-state secondary batteries arranged in the internal space formed by the first cover and the second cover are protected from heat transfer oil, and warping or bending that may occur in the secondary batteries during the WIP process is prevented in advance. The present invention relates to a pressure airtight device for all-solid-state secondary batteries.

Background Art

[0002] In recent years, as the development of electric vehicles, energy storage batteries, robots, satellites, etc. has become full-scale, research on secondary batteries, which are high-performance batteries capable of repeated charging and discharging, has been actively conducted. Currently commercially available secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium secondary batteries, etc. Among them, lithium secondary batteries have attracted attention due to the advantages that they are almost free from memory effects compared to nickel-based secondary batteries, so they can be charged and discharged freely, have a very low self-discharge rate, and have a high energy density.

[0003] Such lithium secondary batteries mainly use lithium-based oxides and carbon materials as the positive electrode active material and the negative electrode active material, respectively. In addition, a lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate, each coated with a positive electrode active material and a negative electrode active material, are arranged with a separator interposed therebetween.

[0004] Among them, all-solid-state secondary batteries are secondary batteries in which all main materials are solid. By using a solid electrolyte, the risks of fire and explosion are significantly reduced, the scope of application is widened, and although the performance is extremely excellent, lithium metal, which could not be used due to the risks of fire and explosion, can be used as a negative electrode material, and the energy density can be dramatically increased. Due to these advantages, the development of all-solid-state secondary batteries is currently being actively carried out.

[0005] On the other hand, in all-solid-state secondary batteries, since ions move between the solid lattice, it is essential to maximize the contact interface between the active material and the electrolyte while minimizing interfacial resistance. For this purpose, a high-temperature pressurization process is known in which the secondary battery is pressurized under isostatic conditions via a fluid that acts as a pressure transfer medium after stacking solid electrolyte layers. One example of this is the WIP (Warm Isostatic Pressing) process. In such a WIP process, a process of covering the secondary battery must be performed first to protect it from the fluid that acts as a pressure transfer medium, such as water or oil.

[0006] Figure 1 is a reference diagram illustrating a conventional method for ensuring airtightness for all-solid-state secondary batteries before the WIP process, Figure 2a is a cross-sectional view illustrating the laminated structure within the pouch film during the conventional pre-pouching process for single cells, and Figure 2b is a cross-sectional view illustrating the laminated structure within the pouch film during the conventional pre-pouching process for bi-cells. The problems of the prior art will be explained below with reference to Figures 1, 2a, and 2b.

[0007] Referring to Figure 1, generally, a pre-pouching process is performed before the WIP process to ensure airtightness of the all-solid-state secondary battery S. Pre-pouching is a process of sealing the secondary battery S by covering the outside of the all-solid-state secondary battery S with an aluminum pouch film P. After the WIP process is completed, an unpouching process is performed in which the pouch film P is torn off and removed. At this time, the pouch film P is a disposable consumable and cannot be reused.

[0008] Furthermore, the pressure applied to the pouch film P via the heat transfer oil during the WIP process can cause the thin film P to bend, which may also cause the all-solid-state secondary battery S covered by the pouch film P to bend and be damaged. To prevent bending of the all-solid-state secondary battery S that may occur during the WIP process and to maintain its shape, a hard plate H must be placed on one side of the all-solid-state secondary battery S. The hard plate H may be, for example, a SUS (Steel Use Stainless) plate.

[0009] Furthermore, during the unpouching process, damage to the all-solid-state secondary battery S frequently occurs when one side of the battery adheres to the pouch film P and / or hard plate H. To prevent this, a release film F is currently placed between the pouch film P and the all-solid-state secondary battery S, and between the all-solid-state secondary battery S and the hard plate H.

[0010] Referring to Figure 2a, during the pre-pouching process for a single cell, as an example, a release film F and a hard plate H can be laminated on one surface of the all-solid-state secondary battery S, and a release film F can be laminated on the other surface of the all-solid-state secondary battery S facing the aforementioned surface. When arranging the release film F in this way, a further step must be taken to remove the release film F using a separate gripper (not shown) in order to separate the release film F from the secondary battery S that has undergone the WIP process.

[0011] Referring to Figure 2b, during the uncouching process for multi-cells such as Bi-cells, a release film F, all-solid-state secondary batteries S, and release film F can be sequentially stacked on one surface of the hard plate H, and a release film F, all-solid-state secondary batteries S, and release film F can be sequentially stacked on the other surface of the hard plate H opposite to the aforementioned surface. Thus, it can be seen that a hard plate H is placed between pairs of all-solid-state secondary batteries S. Therefore, if a WIP process is performed after a pre-pouching process for a large number of all-solid-state secondary batteries S, a hard plate H must be placed in each space between the all-solid-state secondary batteries S, making it difficult to transmit a uniform pressure to the entire surface of each individual all-solid-state secondary battery S via the fluid, which is the pressure transmission medium.

[0012] To prevent the problems described above, the inventors of the present invention present a novel all-solid-state secondary battery pressurized airtight device 1, the details of which will be described later. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Korean Published Patent No. 10-2015-0069523, "All-solid-state secondary battery and method for manufacturing an all-solid-state secondary battery" [Overview of the project] [Problems that the invention aims to solve]

[0014] The present invention has been made to solve the problems of the prior art, and its objective is to provide a pressurized and airtight device for all-solid-state secondary batteries that enables reuse during the WIP process for all-solid-state secondary batteries by allowing the first cover and the second cover to be vacuum-adsorbed without any damage and releasing the adsorption as needed.

[0015] Another object of the present invention is to provide an all-solid-state secondary battery pressurized airtight device that enables easy automatic packing and unpacking of the first and second covers by having the first cover and the second cover vacuum-adsorbed to each other without separate coupling means, and by having the first gripping portion of the first cover and the second gripping portion of the second cover gripped via a separate unit to release the adsorption between the first and second covers.

[0016] Another object of the present invention is to provide an all-solid-state secondary battery pressurized airtight device that enables easy adsorption and release of the covers by having the first cover and the second cover adsorb to each other by a first adsorption surface portion and a second adsorption surface portion which are adsorption pad components.

[0017] Another object of the present invention is to provide a pressurized airtight all-solid-state secondary battery device that allows the all-solid-state secondary battery to be easily separated from the first cover and / or the second cover after the completion of the WIP process by having the bottom surface of the first pressurized surface and / or the top surface of the second pressurized surface have a relatively large surface roughness, or by having a release film adhere to the bottom surface of the first pressurized surface and / or the top surface of the second pressurized surface.

[0018] Another object of the present invention is to provide a pressurized and airtight device for a solid-state secondary battery that prevents damage to the solid-state secondary battery by resisting bending of the first cover and / or the second cover during the WIP process by inserting an insert inside the first and / or second bending prevention portion.

[0019] Another object of the present invention is to provide a pressurized airtight device for solid-state secondary batteries that, by not inserting a hard plate into the internal space formed by the mutual adsorption between the first cover and the second cover, ensures that a substantially uniform pressurizing force is transmitted to the entire surface of the solid-state secondary batteries, particularly when performing a WIP process after inserting a large number of solid-state secondary batteries into a single internal space.

[0020] Another object of the present invention is to provide a fully solid-state secondary battery pressurization and airtightness device that enables easy automated gripping and conveyance of the first cover and / or the second cover by forming the first protrusion and / or the second protrusion.

[0021] Another object of the present invention is to provide a fully solid-state secondary battery pressurization and airtightness device that provides a clearance space for the gripper to easily grip the first protrusion and / or the second protrusion by forming the first wing portion and / or the second wing portion.

[0022] Another object of the present invention is to provide a fully solid-state secondary battery pressurization and airtightness device that enables easy removal of the heat medium oil remaining on the edge side of the first wing portion and / or the second wing portion by forming the side surfaces of the first wing portion and / or the second wing portion to extend obliquely.

[0023] Another object of the present invention is to further improve the adhesion between the first gripping portion and the first cover below the first gripping portion, and / or the second gripping portion and the second cover above the second gripping portion, by forming the first gripping portion and / or the second gripping portion such that the vertical thickness becomes thinner as it extends outward.

[0024] Another object of the present invention is to provide a fully solid-state secondary battery pressurization and airtightness device that enables easy separation between the first cover and the second cover by positioning the first gripping portion on a side where it does not overlap the second gripping portion vertically.

[0025] Another object of the present invention is to provide a fully solid-state secondary battery pressurization and airtightness device that prevents the occurrence of a lifting phenomenon on the edge side during vacuum adsorption of the first cover and the second cover by forming the edge sides of the first adsorption surface portion and the second adsorption surface portion into a round shape.

Means for Solving the Problems

[0026] In order to achieve the above object, the present invention can be realized by an embodiment having the following configuration.

[0027] According to an embodiment of the present invention, the all-solid-state secondary battery pressurization and airtight device according to the present invention includes a first cover and a second cover that is adsorbed to the first cover to form an internal space in which an all-solid-state secondary battery is disposed. The first cover includes a first pressurizing surface portion configured to pressurize at least one surface of one or more all-solid-state secondary batteries disposed in the internal space by the pressure transmitted by the heat transfer medium oil. The second cover includes a second pressurizing surface portion configured to pressurize at least the other surface of one or more all-solid-state secondary batteries disposed in the internal space by the pressure transmitted by the heat transfer medium oil.

[0028] According to another embodiment of the present invention, the first pressurizing surface portion of the all-solid-state secondary battery pressurization and airtight device according to the present invention includes a groove-shaped upper surface that is recessed downward from above the upper surface of the first cover.

[0029] According to another embodiment of the present invention, the first pressurizing surface portion of the all-solid-state secondary battery pressurization and airtight device according to the present invention includes a silicone or rubber material.

[0030] According to another embodiment of the present invention, the first pressurizing surface portion of the all-solid-state secondary battery pressurization and airtight device according to the present invention has a larger surface roughness on at least one side of the surface that contacts the all-solid-state secondary battery during pressurization than on the surface that does not contact the all-solid-state secondary battery during pressurization.

[0031] According to another embodiment of the present invention, the all-solid-state secondary battery pressurization and airtight device according to the present invention further includes a release film disposed between the first pressurizing surface portion and the secondary battery.

[0032] According to another embodiment of the present invention, the first cover of the all-solid-state secondary battery pressurized airtight device according to the present invention further includes a first adsorption surface portion located at the end or edge of the first cover, and the second cover further includes a second adsorption surface portion located at the end or edge of the second cover, wherein the first adsorption surface portion and the second adsorption surface portion are adsorbed to each other.

[0033] According to another embodiment of the present invention, the first adsorption surface portion of the all-solid-state secondary battery pressurized airtight device according to the present invention is characterized by having a rounded edge.

[0034] According to another embodiment of the present invention, the first cover of the all-solid-state secondary battery pressurized airtight device according to the present invention further includes a first bending prevention portion located outside the first pressurized surface portion and into which a first insert is inserted.

[0035] According to another embodiment of the present invention, the first bending prevention portion of the all-solid-state secondary battery pressurized airtight device according to the present invention is characterized by having a larger vertical thickness than the first pressurized surface portion.

[0036] According to another embodiment of the present invention, the first cover of the all-solid-state secondary battery pressurized airtight device according to the present invention is further characterized by including one or more first protrusions projecting outward from one side of the first cover.

[0037] According to another embodiment of the present invention, the first cover of the all-solid-state secondary battery pressurized airtight device according to the present invention further includes one or more first protrusions projecting outward from one side of the first cover, wherein the first insert is integral with the first protrusions.

[0038] According to another embodiment of the present invention, the first cover of the all-solid-state secondary battery pressurized airtight device according to the present invention further includes a first bending resistance means attached to one surface of the first cover outside the first pressurized surface.

[0039] According to another embodiment of the present invention, the bending resistance means of the all-solid-state secondary battery pressurized airtight device according to the present invention is characterized by being attached to the upper surface of the first cover and having a shape that surrounds the first pressurized surface.

[0040] According to another embodiment of the present invention, the first cover of the all-solid-state secondary battery pressurized airtight device according to the present invention further includes a first wing portion that is recessed downward from the upper surface of the first cover below the first protrusion.

[0041] According to another embodiment of the present invention, the bottom surface of the first wing portion of the all-solid-state secondary battery pressurized airtight device according to the present invention is characterized in that it is spaced apart from the first protrusion.

[0042] According to another embodiment of the present invention, the first wing portion of the all-solid-state secondary battery pressurized airtight device according to the present invention includes a bottom surface and a side surface extending upward from the end of the bottom surface, wherein the side surface of the first wing portion extends upward at an angle from the bottom surface of the first wing portion.

[0043] According to another embodiment of the present invention, the side surface of the first wing portion of the all-solid-state secondary battery pressurized airtight device according to the present invention is characterized in that it extends at an obtuse angle with the bottom surface of the first wing portion.

[0044] According to another embodiment of the present invention, the first cover of the all-solid-state secondary battery pressurized airtight device according to the present invention is further characterized by including one or more first gripping portions that protrude outward from one side of the first cover.

[0045] According to another embodiment of the present invention, the first gripping portion of the all-solid-state secondary battery pressurized airtight device according to the present invention is characterized by having a tapered shape.

[0046] According to another embodiment of the present invention, the second cover of the all-solid-state secondary battery pressurized airtight device according to the present invention further includes one or more second gripping portions protruding outward from one side of the second cover, wherein the first gripping portion has a side on which at least a portion of the second gripping portion does not overlap each other vertically when the first cover and the second cover are attracted to each other. [Effects of the Invention]

[0047] The present invention has the following effects through the above-described configuration.

[0048] The present invention has the effect of enabling reuse during the WIP process for all-solid-state secondary batteries by allowing the first and second covers to be vacuum-adsorbed without any damage and releasing the adsorption as needed.

[0049] Furthermore, the present invention has the effect of enabling easy automatic packing and unpacking of the first and second covers by allowing the first cover and the second cover to be vacuum-suctioned to each other without separate coupling means, and by gripping the first gripping portion of the first cover and the second gripping portion of the second cover via a separate unit to release the suction between the first and second covers.

[0050] Furthermore, the present invention has the effect of enabling easy attachment and release of the covers by causing the first cover and the second cover to be attracted to each other by the first and second suction surfaces, which are configured as suction pads.

[0051] Furthermore, the present invention has the effect of enabling the all-solid-state secondary battery to be easily separated from the first cover and / or the second cover after the completion of the WIP process by having the bottom surface of the first pressurized surface and / or the top surface of the second pressurized surface have a relatively large surface roughness, or by attaching a release film to the bottom surface of the first pressurized surface and / or the top surface of the second pressurized surface.

[0052] Furthermore, the present invention has the effect of preventing damage to the all-solid-state secondary battery by resisting bending of the first cover and / or the second cover during the WIP process by inserting an insert inside the first and / or second bending prevention portion.

[0053] Furthermore, the present invention has the effect of ensuring that a substantially uniform pressure is transmitted to the entire surface of the all-solid-state secondary battery, particularly when performing a WIP process after inserting a large number of all-solid-state secondary batteries into a single internal space, by not inserting a hard plate into the internal space formed by the mutual adsorption between the first cover and the second cover.

[0054] Furthermore, the present invention provides the advantage of enabling easy automated gripping and transport of the first cover and / or the second cover by forming the first protrusion and / or the second protrusion.

[0055] Furthermore, the present invention has the effect of providing a margin for the gripper to easily grip the first and / or second protrusions by forming the first and / or second wing portions.

[0056] Furthermore, the present invention has the effect of enabling easy removal of heat transfer oil remaining on the edge side of the first wing portion and / or the second wing portion by forming the side surfaces of the first wing portion and / or the second wing portion to extend in an inclined manner.

[0057] Furthermore, the present invention has the effect of further improving the adhesion between the first gripping portion and the first cover below the first gripping portion, and / or the second gripping portion and the second cover above the second gripping portion, by forming the first gripping portion and / or the second gripping portion so that their thickness decreases as they extend outward.

[0058] Furthermore, the present invention provides the advantage of enabling easy separation of the first cover and the second cover by positioning the first gripping portion on a side that does not overlap the second gripping portion vertically with each other.

[0059] Furthermore, the present invention has the effect of preventing the edge side from lifting up during vacuum adsorption of the first cover and the second cover by forming the edge side of the first adsorption surface and the second adsorption surface in a rounded shape.

[0060] On the other hand, even effects not explicitly mentioned herein, as well as the effects described below in the specification and their provisional effects that are expected by the technical features of the present invention, shall be treated as described in the specification of the present invention. [Brief explanation of the drawing]

[0061] [Figure 1] This is a reference diagram illustrating a conventional method for ensuring airtightness for all-solid-state secondary batteries before the WIP (Wipe-in-Place) process. [Figure 2a] This is a cross-sectional view illustrating the laminated structure within the pouch film during the pre-pouching process for a conventional single cell. [Figure 2b] This is a cross-sectional view illustrating the laminated structure within the pouch film during the pre-pouching process for conventional Bi-cell. [Figure 3] This is a perspective view illustrating a pressurized and airtight all-solid-state secondary battery device according to one embodiment of the present invention. [Figure 4] Figure 3 is an exploded perspective view illustrating the pressurized and airtight device for an all-solid-state secondary battery. [Figure 5] Figure 3 is a cross-sectional view illustrating a pressurized and airtight device for an all-solid-state secondary battery. [Figure 6] This is a plan view illustrating the first cover shown in Figure 3. [Figure 7] This is a bottom view illustrating the first cover shown in Figure 3. [Figure 8] This is an enlarged view illustrating the first wing section shown in Figure 3. [Figure 9] This is a bottom view illustrating the second cover shown in Figure 3. [Figure 10] This is a plan view illustrating the second cover shown in Figure 3. [Figure 11] This is an enlarged view illustrating the second wing section shown in Figure 3. [Modes for carrying out the invention]

[0062] Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Embodiments of the present invention can be modified in various forms, and the scope of the invention should not be construed as being limited to these embodiments, but rather as being construed based on the claims. Furthermore, these embodiments are provided only as reference to further fully illustrate the present invention to those who are ordinary skill in the art.

[0063] As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Also, as used herein, “comprise” and / or “comprising” identify the presence of the shape, figure, step, action, member, element, and / or group thereof mentioned, and do not exclude the presence or addition of one or more other shapes, figures, actions, members, elements, and / or groups thereof.

[0064] In the following, when it is stated that one component (or layer) is placed on another component (or layer), it should be noted that the component may also be placed directly on the other component, or another component or layer may be interposed between them. Also, when it is stated that one component is placed directly on another component, there is no other component located between them. Furthermore, being located "on top," "above," "below," "upper side," "lower side," "one side," or "side" of a component refers to a relative positional relationship.

[0065] Furthermore, in the following sections, some components are numbered and described as "component 1," "component 2," etc. It should be noted that component 2 does not presuppose component 1, and that each component is independent of the others.

[0066] In the following, when we describe the "combination" or "linking" of one component with another, the concept includes not only direct combination / linking of each component, but also indirect combination / linking by a third component.

[0067] Figure 3 is a perspective view illustrating an all-solid-state secondary battery pressurized airtight device according to one embodiment of the present invention, and Figure 4 is an exploded perspective view illustrating the all-solid-state secondary battery pressurized airtight device according to Figure 3. Figure 5 is a cross-sectional view illustrating the all-solid-state secondary battery pressurized airtight device according to Figure 3.

[0068] In the following, with reference to the attached drawings, an all-solid-state secondary battery pressurized airtight device 1 according to one embodiment of the present invention will be described in detail.

[0069] An all-solid-state secondary battery pressurized airtight device 1 according to one embodiment of the present invention is a device configuration for protecting a secondary battery from heat transfer oil while transmitting pressure applied from the heat transfer oil to the secondary battery during the WIP (Warm Isostatic Pressing) process, which is for maximizing the contact interface between the active material and the solid electrolyte and minimizing interfacial resistance in an all-solid-state secondary battery. The "heat transfer oil" is a pressure transmission medium, and is preferably any liquid pressure medium such as water or oil, but the scope of the present invention is not limited thereto.

[0070] Furthermore, the internal space IS of the all-solid-state secondary battery pressurized airtight device 1 may be configured to contain unit cells or bi-cells, but there are no other limitations.

[0071] Referring to Figures 3 to 5, the present invention relates to a pressurized and airtight device 1 for all-solid-state secondary batteries, and more particularly to a pressurized and airtight device 1 for all-solid-state secondary batteries that protects an all-solid-state secondary battery S, which is placed in an internal space IS formed by a first cover 10 and a second cover 30 that are vacuum-adhered to each other, from heat transfer oil, while preventing warping and bending that may occur in the secondary battery S during the WIP process.

[0072] For this purpose, the all-solid-state secondary battery pressurized airtight device 1 may include a first cover 10 and a second cover 30.

[0073] Figure 6 is a plan view illustrating the first cover shown in Figure 3, and Figure 7 is a bottom view illustrating the first cover shown in Figure 3.

[0074] Referring to Figures 3 to 7, the first cover 10 is configured to be attracted to the second cover 30 by mutual adsorption to form an internal space IS in which the all-solid-state secondary battery S is arranged. For example, the first cover 10 can be vacuum-adsorbed to the second cover 30. The first cover 10 can also be made of a material having high elongation characteristics on at least one side so as to pressurize the all-solid-state secondary battery S inside via the pressure transmitted from the heat transfer oil. For example, the first cover 10 may include silicone or rubber materials such as MBR synthetic rubber or FKM fluororubber, but the scope of the present invention is not limited by the above examples, and the first cover 10 can be made of any material or material capable of pressurizing the all-solid-state secondary battery S by the pressure transmitted to it.

[0075] Such a first cover 10 may include a first pressure surface portion 110, a first bending prevention portion 120, a first suction surface portion 130, a first protrusion portion 140, a first wing portion 150, and a first gripping portion 160. It should be noted that, as will be explained below, the first wing portion 150 is not an essential component of the present invention.

[0076] The first pressure surface portion 110 is configured to pressurize at least one surface of the all-solid-state secondary battery S, which is placed in the internal space IS formed by the mutual adsorption between the first cover 10 and the second cover 30. Therefore, it is preferable that the first pressure surface portion 110 be made of a material having high elongation properties. More specifically, when a heat transfer oil flows into a vessel (not shown) and a pressure above a certain level is applied to the first cover 10, the first pressure surface portion 110, which has high elongation properties, can transmit the applied pressure to the all-solid-state secondary battery S. As an example, such a first pressure surface portion 110 can be formed in a rectangular planar shape approximately in the center of the first cover 10, but the scope of the present invention is not limited thereto.

[0077] Furthermore, it is preferable that the first pressure surface portion 110 has a groove-shaped upper surface 110a that recesses downward onto the upper surface of the first cover 10. By recessing the upper surface 110a of the first pressure surface portion 110 downward in this way, the bottom surface 110b of the first pressure surface portion 110 can be brought into close contact with one surface of the all-solid-state secondary battery S arranged in the internal space IS, so that the secondary battery S can be easily pressurized. In addition, it is preferable that the first pressure surface portion 110 has a thinner vertical thickness than the surrounding first bending prevention portion 120 so that when pressure is transmitted to the first cover 10 by the heat transfer oil, the pressure can be easily transmitted to one surface of the all-solid-state secondary battery S.

[0078] Furthermore, it is preferable that the bottom surface 110b of the first pressure surface 110 is substantially flat. In one embodiment, it is preferable that at least one side of the surface of the first pressure surface 110b that contacts the all-solid-state secondary battery S when pressurized has a greater surface roughness than the surface that does not contact the all-solid-state secondary battery S when pressurized. For example, the bottom surface 110b of the first pressure surface 110 can have a surface roughness with a greater uneven shape than the top surface 110a of the first pressure surface 110. Alternatively, in another embodiment, a release film may be placed between the first pressure surface 110 and the secondary battery S arranged in the internal space IS. For example, a release film may be attached to the bottom surface 110b of the first pressure surface 110.

[0079] Referring to Figure 1, as mentioned above, if the all-solid-state secondary battery S is covered with an aluminum pouch film P via a pre-pouching process to protect it during the WIP process, there is a possibility that one side of the secondary battery S may stick to the pouch film P and be damaged when the unpouching process is performed after the completion of the WIP process. To prevent this, if a release film F is attached to one side of the secondary battery S, a separate process must be performed to remove the release film F from the secondary battery S after the completion of the WIP process.

[0080] To prevent such problems, the present invention is characterized by forming the bottom surface 110b of the first pressure surface 110 to have a larger surface roughness than the top surface 110a, or by attaching a release film to the bottom surface 110b of the first pressure surface 110. Thus, it is possible to prevent the all-solid-state secondary battery S from sticking to the first cover 10 after the WIP process.

[0081] Referring to Figures 3 to 7, the first bending prevention portion 120 is formed between the first pressure surface portion 110 and the first suction surface portion 130, and is configured to maintain the shape of the first cover 10 and prevent bending during the WIP process. The shape of such a first bending prevention portion 120 is not limited, but as an example, it can have a rectangular frame-like planar shape with rounded edges. Furthermore, the first bending prevention portion 120 can be formed at a higher position than the first pressure surface portion 110 which is recessed downwards. In one embodiment, a first insert I1 can be inserted inside the first bending prevention portion 120. The first insert I1 is preferably made of metal or plastic. As an example, the first insert I1 may be SK5 heat-treated steel, SUS, aluminum, engineering plastic, etc., but the scope of the present invention is not limited by the above examples.

[0082] Referring to Figure 1, if the all-solid-state secondary battery S is covered with an aluminum pouch film P via a pre-pouching process to protect it during the WIP process, the pouch film P may be bent by the pressure transmitted by the heat transfer oil during the WIP process, and as a result, the secondary battery S covered by the pouch film P may also be bent and damaged.

[0083] To prevent such problems, referring to Figures 3 to 7, one embodiment of the present invention is characterized in that a first insert I1 is inserted inside the first bending prevention portion 120. The first insert I1 may have substantially the same shape as the first bending prevention portion 120, but the scope of the present invention is not limited thereto. The first insert I1 makes it possible to increase the rigidity of the outer region of the first pressing surface portion 110 of the first cover 10 while maintaining the flexibility of the first pressing surface portion 110.

[0084] In another embodiment, the first bending resistance means I1 can be mounted on one surface of the first cover 10 without the first insert I1 being inserted inside the first bending prevention portion 120. The first bending resistance means I1 can be mounted, for example, on the upper surface of the first cover 10. In this case, the first bending resistance means I1 may be mounted in a position surrounding the first pressure surface portion 110. When the first bending resistance means I1 is mounted on the upper surface of the first cover 10 in this manner, the first bending prevention portion 120 may or may not be formed on the first cover 10 side, and there is no particular limitation thereon. Furthermore, the first bending resistance means I1 may be made of substantially the same material as the first insert I1.

[0085] By using the pressurized airtight device 1 having the aforementioned first insert / first bending resistance means I1, it is possible to prevent the all-solid-state secondary battery S from being bent during the WIP process. Therefore, it is not necessary to place a separate hard plate H in the internal space IS formed by the first cover 10 and the second cover 30. Thus, even if the WIP process is performed after so-called multi-stacking, where a large number of all-solid-state secondary batteries S are stacked in the internal space IS of a single pressurized airtight device 1, a uniform pressurizing force can be transmitted to the entire surface of the large number of all-solid-state secondary batteries S.

[0086] The first suction surface portion 130 is formed on one side of the first cover 10, for example, on the end or edge side of the first cover 10, and is configured such that a vacuum is formed in the internal space IS by mutual suction with the second suction surface portion 330. Furthermore, since the first suction surface portion 130 has a rounded edge side, it is preferable to prevent a lifting phenomenon from occurring on both edge sides when vacuum adsorption occurs with the second suction surface portion 330, which has substantially the same shape. A vacuum environment can be formed in the internal space IS by mutual suction between the first suction surface portion 130 and the second suction surface portion 330. The term "vacuum environment" above is understood to be an environment with a pressure value lower than atmospheric pressure. Furthermore, the first suction surface portion 130 can be formed from substantially the same material or material as the upper surface 110a of the first pressure surface portion 110, but there are no particular limitations thereto. The first suction surface portion 130 described above can function as a suction pad. The areas where the adsorption function takes place are the bottom surface of the first adsorption surface 130 and the top surface of the second adsorption surface 330. In this way, the first cover 10 and the second cover 30 are vacuum-adsorbed to each other by mutual adsorption of the first adsorption surface 130 and the second adsorption surface 330 without the need for separate bonding means, thus enabling easy automatic packing of the first cover 10 and the second cover 30.

[0087] The first protrusion 140 consists of one or more protrusions that project outward from one side of the first cover 10. Preferably, the first protrusion 140 projects outward from one side of the first cover 10, excluding the first pressure surface portion 110, and preferably, a number of them are provided spaced apart from each other on the first cover 10 side. In the illustrated example, a total of six first protrusions 140 are formed, but the scope of the present invention is not limited thereto. Such first protrusions 140 may project outward from the first insert I1 and be formed integrally with the first insert I1, or they may be formed physically independently of the first insert I1. Furthermore, the first protrusions 140 may be formed from substantially the same material or material as the first insert I1, or from a different material or material. Such first protrusions 140 correspond to the side on which a gripper (not shown) grips the first cover 10. Therefore, the first cover 10 can be easily and automatically gripped and transported via the first protrusions 140.

[0088] Figure 8 is an enlarged view illustrating the first wing section shown in Figure 3.

[0089] Referring to Figures 3 to 6 and Figure 8, the first wing portion 150 is configured to be recessed downward from the upper surface of the first cover 10 below the first projection 140. By recessing the upper surface of the first cover 10 located below the first projection 140 in this way, a clearance space can be provided for the gripper to easily grip the first projection 140. In other words, a larger clearance can be maintained between the first projection 140 and the upper surface of the first cover 10 that matches it. The first wing portion 150 may also have a recessed bottom surface 150a and two side surfaces 150b extending upward from the end of the bottom surface 150a. In this case, it is preferable that the two side surfaces 150b extend upward in an inclined direction rather than vertically, and it is preferable that they extend upward at an obtuse angle with the bottom surface 150a.

[0090] After the WIP process, a cleaning process must be performed to remove the heat transfer oil remaining in the airtight device 1 according to one embodiment of the present invention. However, if the side surface 150b of the first wing portion 150 is formed perpendicular to the bottom surface 150a, it is not easy to clean the heat transfer oil remaining at the corner where the bottom surface 150a and the side surface 150b intersect. In contrast, if both side surfaces 150b of the first wing portion 150 are formed at an angle, as in one embodiment of the present invention, the heat transfer oil at the corner where the bottom surface 150a and the side surfaces 150b intersect can be easily removed. However, as mentioned above, it should be noted that the first wing portion 150 is not an essential component of the present invention.

[0091] Referring to Figures 3 to 7, the first gripping portion 160 is configured to protrude outward from another side of the first cover 10, enabling the worker to grip it. Such a first gripping portion 160 can protrude outward from the side of the first cover 10 by a predetermined length. After the WIP process, in order to remove the all-solid-state secondary battery S placed in the internal space IS, the first cover 10 and the second cover 30 must be released from each other by suction. At this time, the worker can release the covers 10 and 30 by directly gripping the first gripping portion 160 and the second gripping portion 360, or by using a separate unit. In this way, when the first cover 10 and the second cover 30 are automatically released by the first gripping portion 160 and the second gripping portion 360, easy automatic unpacking of the first cover 10 and the second cover 30 can be achieved.

[0092] Furthermore, for easy separation of the first cover 10 and the second cover 30, it is even more preferable that the first gripping portion 160 be located on a side that does not overlap the second gripping portion 360 vertically, or that it be formed at a position that separates it from the second gripping portion 360 horizontally. As another example, the first gripping portion 160 may have a side that overlaps the second gripping portion 360 vertically and a side that does not overlap it vertically. That is, the first gripping portion 160 and the second gripping portion 360 can be formed at a position that partially overlaps the second gripping portion 360 vertically. Such a first gripping portion 160 may be formed as a single portion protruding from the first cover 10, or as two or more portions spaced apart from each other, and there is no particular limit to the number.

[0093] Furthermore, the first gripping portion 160 may be formed such that its thickness decreases continuously or discontinuously along the direction in which it protrudes outward from the first cover 10. In other words, the first gripping portion 160 may be formed in a tapered shape. By forming it in this way, the adhesion force between the first gripping portion 160 and the first cover 10 below the first gripping portion 160 can be further increased.

[0094] Figure 9 is a bottom view illustrating the second cover shown in Figure 3, Figure 10 is a top view illustrating the second cover shown in Figure 3, and Figure 11 is an enlarged view illustrating the second wing section shown in Figure 3.

[0095] Referring to Figures 3 to 5 and Figures 9 to 11, the second cover 30 is configured to be attracted to the first cover 10 together with it to form an internal space IS in which the all-solid-state secondary battery S is arranged. The second cover 30 may also have a shape that is vertically symmetrical to the first cover 10 along the horizontal axis, and may include a second pressure surface portion 310, a second bending prevention portion 320, a second suction surface portion 330, a second protrusion portion 340, a second wing portion 350, and a second gripping portion 360.

[0096] Each second pressure surface portion 310 corresponds to the first pressure surface portion 110, the second bending prevention portion 320 to the first bending prevention portion 120, the second suction surface portion 330 to the first suction surface portion 130, the second protrusion portion 340 to the first protrusion portion 140, the second wing portion 350 to the first wing portion 150, and the second gripping portion 360 to the first gripping portion 160, and further explanation of these is omitted. In addition, depending on the case, the first wing portion 150 and / or the second wing portion 350 may not be formed, and the formation positions of the first protrusion portion 140 and the second protrusion portion 340 may be different from each other and may not be matched.

[0097] Furthermore, a second insert I2 corresponding to the first insert I1 may be inserted inside the second bending prevention portion 320. Also, similar to the first bending resistance means I1, the second bending resistance means I2 may be mounted on one surface of the second cover 30. For example, the second bending resistance means I2 may be mounted on the bottom surface of the second cover 30. In this case, the second bending resistance means I2 may be mounted in a position surrounding the second pressure surface portion 310. When the second bending resistance means I2 is mounted on the bottom surface of the second cover 30 in this way, the second bending prevention portion 320 may or may not be formed on the second cover 30 side, and there is no particular limitation thereon.

[0098] The above detailed description is illustrative of the present invention. Furthermore, the foregoing describes preferred embodiments of the present invention, and the present invention can be used in a variety of other combinations, modifications, and environments. That is, modifications and alterations are possible within the scope of the concept of the invention disclosed herein, the scope equivalent to the disclosure, and / or within the scope of the art or knowledge. The embodiments described herein describe the best-case scenario for realizing the technical idea of ​​the present invention, and a variety of modifications are possible as required in the specific field of application and use of the present invention. Therefore, the above detailed description of the invention is not intended to limit the present invention to the disclosed embodiments. [Explanation of Symbols]

[0099] 1. All-solid-state secondary battery pressurized airtight device 10. Cover 1 110 First pressure surface 110a top side 110b Bottom 120 First bending prevention section 130 1st suction surface section 140 1st protrusion 150 First Wing Section 150a base 150b side 160 1st grip part 30 Second Cover 310 Second pressure surface 310a bottom 310b top surface 320 Second bending prevention section 330 Second suction surface section 340 Second protrusion 350 Second Wing Section 350a top 350b side 360 2nd grip part S All-solid-state secondary battery P Pouch Film F Release film H Hard Plate I1 First insert / first bending resistance means I2 Second insert / second bending resistance means IS interior space

Claims

1. First cover and, The first cover and the second cover are attracted to each other to form an internal space in which an all-solid-state secondary battery is arranged, The first cover is, It includes a first pressurizing surface portion such that at least one surface of one or more all-solid-state secondary batteries arranged in the internal space is pressurized by the pressure transmitted by the heat transfer oil, The second cover is, A pressurized and airtight all-solid-state secondary battery device, characterized by including a second pressurized surface portion that pressurizes at least the other surface of one or more all-solid-state secondary batteries arranged in the internal space by pressure transmitted by a heat transfer oil.

2. The all-solid-state secondary battery pressurized airtight device according to claim 1, characterized in that the first pressurized surface portion includes a groove-shaped upper surface that recesses downward from the upper surface of the first cover.

3. The all-solid-state secondary battery pressurized airtight device according to claim 1, characterized in that the first pressurized surface portion includes a silicone or rubber material.

4. The first pressure surface portion is, The all-solid-state secondary battery pressurized airtight device according to claim 1, characterized in that at least one side of the surface that contacts the all-solid-state secondary battery when pressurized has a larger surface roughness than the surface that does not contact the all-solid-state secondary battery when pressurized.

5. The all-solid-state secondary battery pressurized airtight device according to claim 1, further comprising a release film disposed between the first pressurized surface and the all-solid-state secondary battery.

6. The first cover further includes a first suction surface portion located at the end or edge of the first cover, The second cover further includes a second suction surface portion located at the end or edge of the second cover, The all-solid-state secondary battery pressurized airtight device according to claim 1, characterized in that the first adsorption surface and the second adsorption surface are adsorbed to each other.

7. The all-solid-state secondary battery pressurized airtight device according to claim 6, characterized in that the first adsorption surface portion has a rounded edge.

8. The first cover is, The all-solid-state secondary battery pressurized airtight device according to claim 1, further comprising a first bending prevention portion located on the outside of the first pressurizing surface portion and into which a first insert is inserted.

9. The first bending prevention part is, The all-solid-state secondary battery pressurized airtight device according to claim 8, characterized in that it has a larger vertical thickness compared to the first pressurized surface portion.

10. The first cover is, The all-solid-state secondary battery pressurized airtight device according to claim 1, further comprising one or more first protrusions projecting outward from one side of the first cover.

11. The first cover is, It further includes one or more first protrusions projecting outward from one side of the first cover, The first insert is The all-solid-state secondary battery pressurized airtight device according to claim 8, characterized in that it is integrated with the first protrusion.

12. The first cover is, The all-solid-state secondary battery pressurized airtight device according to claim 1, further comprising a first bending resistance means attached to one surface of the first cover on the outside of the first pressurized surface.

13. The first bending resistance means is The all-solid-state secondary battery pressurized airtight device according to claim 12, characterized in that it is attached to the upper surface of the first cover and has a shape that surrounds the first pressurized surface portion.

14. The first cover is, The all-solid-state secondary battery pressurized airtight device according to claim 10, further comprising a first wing portion that is recessed downward from the upper surface of the first cover below the first protrusion.

15. The bottom surface of the first wing section is The all-solid-state secondary battery pressurized airtight device according to claim 14, characterized in that it is spaced apart from the first protrusion.

16. The first wing section is, The bottom and, Including a side surface extending upward from the end of the bottom surface, The side surface of the first wing section is The all-solid-state secondary battery pressurized airtight device according to claim 14, characterized in that it extends upward inclined from the bottom surface of the first wing portion.

17. The side surface of the first wing section is The all-solid-state secondary battery pressurized airtight device according to claim 16, characterized in that it extends at an obtuse angle with the bottom surface of the first wing portion.

18. The first cover is, The all-solid-state secondary battery pressurized airtight device according to claim 1, further comprising one or more first gripping portions protruding outward from one side of the first cover.

19. The all-solid-state secondary battery pressurized airtight device according to claim 18, characterized in that the first gripping portion has a tapered shape.

20. The second cover is, It further includes one or more second gripping portions protruding outward from one side of the second cover, The first gripping part is, The all-solid-state secondary battery pressurized airtight device according to claim 18, characterized in that when the first cover and the second cover are attracted to each other, the second gripping portion and at least a portion of it have sides that do not overlap each other vertically.

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