KR20230149058A - Solid-state battery and manufacturing device and method of Solid-state battery - Google Patents

Abstract

Embodiments of the present invention relate to an all-solid-state battery and an apparatus and method for manufacturing the all-solid-state battery. An all-solid-state battery manufacturing apparatus according to an embodiment of the present invention includes a die plate supporting at least one all-solid-state battery; a protective film that surrounds and seals the all-solid-state battery and the die plate; a first cover that is in close contact with the upper part of the die plate while the protective film is in close contact; a second cover disposed inside the first cover and in close contact with the top of the all-solid-state battery while the protective film is in close contact with the second cover; and a vacuum head coupled to the first cover and the second cover and communicating with the first cover to form a flow path for discharging air to the outside.
According to an embodiment of the present invention, damage to the all-solid-state battery that may occur when separating the protective film from the all-solid-state battery can be prevented by easily separating the protective film used when manufacturing the all-solid-state battery. Additionally, the time to remove the protective film is shortened, which improves process efficiency and improves the manufacturing reliability of the all-solid-state battery.

Description

All-solid-state battery, manufacturing device and method of all-solid-state battery {Solid-state battery and manufacturing device and method of Solid-state battery}

Embodiments of the present invention relate to an all-solid-state battery and an apparatus and method for manufacturing an all-solid-state battery.

Recently, in accordance with industrial demands, the development of batteries with high energy density and safety has been actively conducted. An all-solid-state battery is a battery that is densified by laminating an anode, a solid electrolyte, and a cathode and pressurizing it. It is a battery that uses a solid electrolyte instead of the electrolyte of a typical secondary battery.

All-solid-state batteries are manufactured by wet isostatic pressing or dry isostatic pressing. The wet isostatic pressing method has the problem of low productivity because the sealing and unsealing processes according to the wet process are complicated. Accordingly, there is a trend of interest in dry isotropic pressurization methods when developing all-solid-state batteries. An example of a dry isostatic pressing method is disclosed in U.S. Patent Registration No. 5490969 (registration date 1996.02.13).

In the dry isostatic pressing method, when pressurizing an all-solid-state battery, the all-solid-state battery is covered with a film such as a pouch and then pressurized. However, during the removal process of the pouch film, a problem occurs where the all-solid-state battery and the film are not separated or the all-solid-state battery is damaged.

The above-described information disclosed in the background technology of this invention is only for improving understanding of the background of the present invention, and therefore may include information that does not constitute prior art.

Embodiments of the present invention provide an all-solid-state battery and an apparatus and method for manufacturing an all-solid-state battery that can prevent damage to the all-solid-state battery during the manufacturing process.

Embodiments of the present invention include a die plate supporting at least one all-solid-state battery; a protective film that surrounds and seals the all-solid-state battery and the die plate; a first cover that is in close contact with the upper part of the die plate while the protective film is in close contact with the die plate; a second cover disposed inside the first cover and in close contact with the top of the all-solid-state battery while the protective film is in close contact with the second cover; and a vacuum head coupled to the first cover and the second cover and communicating with the first cover to form a flow path for discharging air to the outside.

The first cover has a hexahedral shape with an open bottom, and a through hole is formed in the upper surface so that the vacuum head is inserted into the through hole.

The second cover has a hexahedral shape with an open bottom, and is characterized in that the vacuum head is coupled to the upper surface.

The vacuum head has a cylindrical shape and is characterized in that a plurality of through holes communicating with the first cover are formed on the outer peripheral surface.

A characteristic feature is that rubber pads are provided at the bottom of the first cover and the second cover, respectively.

The bottom of the rubber pad of the first cover and the bottom of the rubber pad of the second cover are characterized in that they are formed to have a level difference.

The step is characterized in that it corresponds to the distance from the upper surface of the die plate to the upper surface of the protective film.

The second cover is characterized in that the length to the bottom of the rubber pad is shorter than the length to the bottom of the rubber pad of the first cover by the step.

The edge of the all-solid-state battery is characterized in that it is disposed between the first cover and the second cover.

Additionally, embodiments of the present invention include disposing at least one plate-shaped material for an all-solid-state battery on a die plate; wrapping and sealing the plate-shaped material for an all-solid-state battery and the die plate with a protective film; Forming an all-solid-state battery by pressurizing the plate-shaped material for an all-solid-state battery; A first cover is in close contact with the die plate spaced apart from the all-solid-state battery, and a second cover is in close contact with the all-solid-state battery, and then air is discharged through a vacuum head in communication with the first cover to cover the first cover. forming a vacuum by discharging air from an area between the first cover and the second cover; and releasing the vacuum after a preset time and removing the protective film.

Additionally, an embodiment of the present invention provides an all-solid-state battery made by the manufacturing method of claim 10.

According to an embodiment of the present invention, damage to the all-solid-state battery that may occur when separating the protective film from the all-solid-state battery can be prevented by easily separating the protective film used when manufacturing the all-solid-state battery. Additionally, the time to remove the protective film is shortened, which improves process efficiency and improves the manufacturing reliability of the all-solid-state battery.

Figure 1 is a perspective view showing a manufacturing apparatus for an all-solid-state battery according to an embodiment of the present invention.
Figure 2 is a perspective view showing the manufacturing apparatus of the all-solid-state battery according to Figure 1 from the bottom.
Figure 3 is an exploded perspective view of the manufacturing apparatus for the all-solid-state battery according to Figure 1.
Figure 4 is a perspective view showing a later stage in the manufacturing process of an all-solid-state battery according to an embodiment of the present invention.
Figure 5 is a cross-sectional view showing a manufacturing apparatus for an all-solid-state battery at a later stage of the manufacturing process according to Figure 4.
Figure 6 is an enlarged cross-sectional view showing main parts of the all-solid-state battery manufacturing apparatus according to Figure 5.
FIG. 7A is a cross-sectional view of the all-solid-state battery manufacturing apparatus according to FIG. 1 cut in the YZ direction.
Figure 7b is a cross-sectional view of the all-solid-state battery manufacturing apparatus according to Figure 1 cut in the XY direction.
Figure 8 is a cross-sectional view showing a state of negative pressure applied to the main part according to Figure 6.

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified into various other forms, and the scope of the present invention is as follows. It is not limited to examples. Rather, these embodiments are provided to make the disclosure more faithful and complete, and to fully convey the spirit of the invention to those skilled in the art.

In addition, in the drawings below, the thickness and size of each layer are exaggerated for convenience and clarity of explanation, and the same symbols refer to the same elements in the drawings. As used herein, the term “and/or” includes any one and all combinations of one or more of the listed items. In addition, the meaning of "connected" in this specification refers not only to the case where member A and member B are directly connected, but also to the case where member C is interposed between member A and member B to indirectly connect member A and member B. do.

The terms used herein are used to describe specific embodiments and are not intended to limit the invention. As used herein, the singular forms include the plural forms unless the context clearly indicates otherwise. Additionally, when used herein, “comprise, include,” and/or “comprising, including” refer to mentioned features, numbers, steps, operations, members, elements, and/or groups thereof. It specifies the presence and does not exclude the presence or addition of one or more other shapes, numbers, movements, members, elements and/or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers and/or parts, these members, parts, regions, layers and/or parts are limited by these terms. It is obvious that this cannot be done. These terms are used only to distinguish one member, component, region, layer or section from another region, layer or section. Accordingly, a first member, component, region, layer or portion described below may refer to a second member, component, region, layer or portion without departing from the teachings of the present invention.

Space-related terms such as “beneath,” “below,” “lower,” “above,” and “upper” are used to refer to an element or feature shown in a drawing. It can be used to facilitate understanding of other elements or features. These space-related terms are for easy understanding of the present invention according to various process states or usage states of the present invention, and are not intended to limit the present invention. For example, if an element or feature in a drawing is turned over, an element or feature described as “bottom” or “below” becomes “top” or “above.” Therefore, “lower” is a concept encompassing “upper” or “lower.”

Hereinafter, an all-solid-state battery, an apparatus and method for manufacturing an all-solid-state battery according to an embodiment of the present invention will be described in detail with reference to the attached drawings. First, the manufacturing apparatus for the all-solid-state battery 10 will be described.

Figure 1 is a perspective view showing a manufacturing apparatus for an all-solid-state battery according to an embodiment of the present invention. Figure 2 is a perspective view showing the manufacturing apparatus of the all-solid-state battery according to Figure 1 from the bottom. Figure 3 is an exploded perspective view of the manufacturing apparatus for the all-solid-state battery according to Figure 1.

As shown in Figures 1 to 3, the all-solid-state battery manufacturing apparatus 50 is equipment used in the later stages of the all-solid-state battery manufacturing process. The manufacturing apparatus 50 may include a first cover 510 and a second cover 530, and a vacuum head 550 coupled to the first cover 510 and the second cover 530. The manufacturing device 50 serves to separate the protective film 30 from the all-solid-state battery 10 that has undergone a pressurization process (this will be described later). In the present invention, the all-solid-state battery manufacturing apparatus 50 includes a die plate 40 that supports the all-solid-state battery 10, and a protective film 30 that covers the all-solid-state battery 10 and surrounds the die plate 40. It is defined as a concept that includes. However, since the die plate 40 and the protective film 30 adopt a conventional structure, the description will focus on the first cover 510 and the second cover 530, which are the main components of the manufacturing device 50.

The first cover 510 has a rectangular upper surface 512, a pair of long side surfaces extending downward at a right angle from the upper surface 512 and having a relatively large area, and a pair of long side surfaces extending downward at a right angle from the upper surface 512 and having a relatively large area. A pair of single side surfaces having a small area can be formed integrally. However, the first cover 510 has an open shape in the area where the lower surface is located. That is, the first cover 510 may have a rectangular parallelepiped shape with an open bottom. The first cover 510 can be applied without limitation as long as it is made of a material that is strong enough not to be deformed or damaged by vacuum pressure. By way of example, the first cover 510 may be made of a material such as stainless steel, aluminum, or high-strength plastic. A through hole into which the vacuum head 550 is inserted is formed through the upper surface 512 of the first cover 510, and a portion of the vacuum head 550 may be inserted into the through hole. A rubber pad 514 may be provided at the lower edge of the first cover 510 (hereinafter referred to as the bottom of the first cover). The second cover 530 may be stored inside the first cover 510.

A rubber pad 514 may be provided along the bottom of the first cover 510. As an example, the rubber pad 514 may be made separately and detachably coupled to the first cover 510, or may be attached to the first cover 510 using an adhesive or the like. Alternatively, it may be formed integrally with the first cover 510 using a method such as double injection.

The second cover 530 has a rectangular upper surface 532, a pair of long side surfaces extending downward at a right angle from the upper surface 532 and having a relatively large area, and a pair of long side surfaces extending downward at a right angle from the upper surface 532 and having a relatively large area. A pair of single side surfaces having a small area can be formed integrally. However, the second cover 530 also has an open shape in the area where the lower surface is located. That is, the second cover 530 may have a rectangular parallelepiped shape with an open bottom. In addition, the second cover 530 must be accommodated in the receiving space formed by the first cover 510, so it is formed in a smaller size than the first cover 510. The second cover 530 may be made of the same or similar material as the first cover 510.

The second cover 530 may be formed so that its lower end has a predetermined step H1 from the first cover 510 . That is, with reference to FIG. 2 , the vertical lengths of the long and short sides of the second cover 530 are shorter than the vertical lengths of the long and short sides of the first cover 510 by the step H1. The step H1 corresponds to the height of the all-solid-state battery 10 stack, which will be described later (this will be described later). A vacuum head 550 may be coupled to the upper surface 532 of the second cover 530. A rubber pad 514 may be provided at the lower edge of the second cover 530 (hereinafter referred to as the bottom of the first cover).

The rubber pad 534 of the second cover 530 may be provided along the bottom of the second cover 530. As an example, the rubber pad 534 may be made separately and detachably coupled to the second cover 530, or may be attached to the second cover 530 using an adhesive or the like. Alternatively, it may be formed integrally with the second cover 530 using a method such as double injection.

The vacuum head 550 has a hollow cylindrical shape, one end in the longitudinal direction is closed, and the other end is open. The closed end of the vacuum head 550 is the lower end, and a plurality of circular through holes 552 may be formed along the circumferential direction on the outer peripheral surface adjacent to the lower end. Although not shown in the drawing, a sealing structure for airtightness may be added between the through hole of the first cover 510 and the vacuum head 550 (the sealing structure may be provided with a rubber or silicone ring, etc., or an adhesive) etc.). The closed lower end of the vacuum head 550 is coupled to the upper surface 532 of the second cover 530, and the other end may be connected to a device that generates vacuum, such as a vacuum pump or regulator, through a separate tube or tube. When vacuum is created, air is discharged to the outside through the vacuum head 550. Therefore, the vacuum head 550 becomes an air discharge path.

A method of manufacturing an all-solid-state battery using the all-solid-state battery manufacturing apparatus of the above-described structure will now be described.

Figure 4 is a perspective view showing a later stage in the manufacturing process of an all-solid-state battery according to an embodiment of the present invention. Figure 5 is a cross-sectional view showing a manufacturing apparatus for an all-solid-state battery at a later stage of the manufacturing process according to Figure 4. Figure 6 is an enlarged cross-sectional view showing main parts of the all-solid-state battery manufacturing apparatus according to Figure 5.

As shown in FIG. 4, in the later stages of manufacturing the all-solid-state battery, at least one all-solid-state battery 10 is placed on the die plate 40 for stacking and pressing the all-solid-state battery 10. For process efficiency, a separation film 20 may be interposed between a plurality of all-solid-state batteries 10 and then stacked.

Illustratively, the all-solid-state battery 10 includes a solid electrolyte 11, a positive electrode active material 13 and a negative electrode active material 15 disposed on both sides of the solid electrolyte 11, and a positive electrode active material 13 and a negative electrode active material 15. The positive electrode current collector 17 and the negative electrode current collector 19 disposed on the outside may have a stacked structure (see FIG. 6). Additionally, films, plates, etc. may be added for the purpose of generating uniform pressure distribution on the upper and lower surfaces of the single or multi-layer all-solid-state battery 10. The lamination method of plate-shaped materials can be adopted by conventional methods. This structure is defined as a plate-shaped material for all-solid-state batteries, and can be classified into plate-shaped materials before pressurization and all-solid-state batteries after pressurization. However, for convenience, in the present invention, the plate-shaped material before pressurization is also described and shown in the drawings as an all-solid-state battery.

The all-solid-state battery 10 can be formed by covering the all-solid-state battery 10 stacked on the die plate 40 with a protective film 30, vacuum-packing it, and densifying it by uniformly pressing it using an isostatic pressing method. Afterwards, the vacuum pressure is released to separate the protective film 30 and the pressurized all-solid-state battery 10 is separated. At this time, the manufacturing device ( ) of the above-described structure is used to separate the protective film (30).

With the all-solid-state battery 10 pressed on the die plate 40 and in close contact with the protective film 30, the second cover 530 is placed on the all-solid-state battery 10 and the first cover 510 ) is disposed on the outside and spaced apart from the all-solid-state battery 10. That is, the second cover 530 is formed smaller than the size of the all-solid-state battery 10, and the first cover 510 is formed larger than the all-solid-state battery 10. At this time, the area around the edge of the all-solid-state battery 10 (area A in FIG. 5) is enlarged and shown in FIG. 6.

In a later manufacturing process for separating the protective film 30, the rubber pad 534 of the second cover 530 is placed on the all-solid-state battery 10. The rubber pad 514 of the first cover 510 is placed on the outer protective film 30 of the all-solid-state battery 10 and is in close contact with it. Therefore, the side length (length including the bottom of the rubber pad) of the second cover 530 must be shorter than that of the first cover 510 by the stacked height.

Illustratively, two all-solid-state batteries 10 may be arranged up and down with a separation film 20 in between, and a protective film 30 may be in close contact thereon (hereinafter referred to as two all-solid-state batteries and between them). The laminated structure of the separation film placed on is defined as a laminated body of an all-solid-state battery). In this case, the step H1 between the bottom of the rubber pad 514 of the first cover 510 and the bottom of the rubber pad 534 of the second cover 530 is determined by the thickness of the two all-solid-state batteries 10 and the separation film ( 20) and the thickness of the protective film 30 plus the height H2. When a plurality of all-solid-state batteries 10 are provided, the height H2 can be defined as the distance from the top surface of the die plate 40 to the top surface of the protective film 30. In the drawing, to aid understanding, the thicknesses of the separation film 20 and the protective film 30 are expressed as being the same or similar to the thickness of the all-solid-state battery 10. However, in reality, the thickness of the separation film 20 and the protective film 30 is relatively thin compared to the all-solid-state battery 10, and H2 may be almost similar to the thickness of the two all-solid-state batteries 10.

Even if the vacuum between the protective film 30 and the die plate 40 is released in order to separate the protective film 30, the protective film 30 is well In many cases, they are not separated. In particular, in the isostatic pressing process, the protective film 30 penetrates into and penetrates between the lower edge of the stack of the all-solid-state battery 10 and the die plate 40, so the degree of adhesion is strong, making it difficult to separate the protective film 30. Therefore, in order to easily separate the B region, a structure of the manufacturing device 50 is provided in which the B region can be placed within the negative pressure generation area.

FIG. 7A is a cross-sectional view of the all-solid-state battery manufacturing apparatus according to FIG. 1 taken in the Y-Z direction. Figure 7b is a cross-sectional view of the all-solid-state battery manufacturing apparatus according to Figure 1 taken in the X-Y direction. Figure 8 is a cross-sectional view showing the state of negative pressure applied to the main part according to Figure 6.

Figures 7a and 7b show a flow path through which air flows out of the manufacturing apparatus 50 through the vacuum head 550 to form a vacuum. As shown by the arrows in FIGS. 7A and 7B, air inside the manufacturing device 50, that is, in the area between the first cover 510 and the second cover 530, flows through the through hole 552 at the bottom of the vacuum head 550. It exits through. Since the inside of the vacuum head 550 and the inside of the first cover 510 are communicated through the through hole 552, the area C between the first cover 510 and the second cover 530 (hereinafter referred to as the area between) Air can also escape to the outside through the vacuum head 550. Accordingly, the area C becomes a vacuum state and negative pressure is formed.

At this time, since the second cover 530 is not in communication with the vacuum head 550, the inside of the second cover 530 is not in a vacuum state and no negative pressure is formed. Therefore, as shown in FIG. 8, the protective film 30 in the area pressed by the second cover 530 does not lift up. Conversely, negative pressure is formed in the area C between the first cover 510 and the second cover 530, so that the protective film 30 is separated from the die plate 40 and the stack of the all-solid-state battery 10. I get excited. When the protective film 30 is separated to some extent, the vacuum is broken, the manufacturing device 50 is moved, and the protective film 30 is removed from the die plate 40 to complete the manufacturing of the all-solid-state battery 10. .

According to an embodiment of the present invention, damage to the all-solid-state battery that may occur when separating the protective film from the all-solid-state battery can be prevented by easily separating the protective film used when manufacturing the all-solid-state battery. Additionally, the time to remove the protective film can be shortened, improving process efficiency and improving the manufacturing reliability of the all-solid-state battery.

What has been described above is only one embodiment for carrying out the present invention, and the present invention is not limited to the above-described embodiments, and the present invention can be applied without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will say that the technical spirit of the present invention extends to the extent that various modifications can be made.

10: All-solid-state battery 20: Separation film
30: Protective film 40: Die plate
50: Manufacturing device 510: First cover
514: Rubber pad 530: Second cover
534: Rubber pad 550: Vacuum head
552: Through hole C: Negative pressure generation area

Claims (11)

A die plate supporting at least one all-solid-state battery;
a protective film that surrounds and seals the all-solid-state battery and the die plate;
a first cover that is in close contact with the upper part of the die plate while the protective film is in close contact;
a second cover disposed inside the first cover and in close contact with the top of the all-solid-state battery while the protective film is in close contact with the second cover; and
An all-solid-state battery manufacturing apparatus comprising a vacuum head coupled to the first cover and the second cover and communicating with the first cover to form a flow path for discharging air to the outside. According to claim 1,
The first cover has a hexahedral shape with an open bottom, and a through hole is formed in the upper surface so that the vacuum head is inserted into the through hole. According to claim 2,
The second cover has a hexahedral shape with an open bottom, and the vacuum head is coupled to the upper surface. According to claim 3,
The vacuum head has a cylindrical shape, and a plurality of through holes communicating with the first cover are formed on an outer peripheral surface. According to claim 4,
An all-solid-state battery manufacturing apparatus wherein rubber pads are provided at lower ends of the first cover and the second cover, respectively. According to claim 4,
The manufacturing apparatus of an all-solid-state battery, wherein the bottom of the rubber pad of the first cover and the bottom of the rubber pad of the second cover are formed to have a step. According to claim 6,
The manufacturing apparatus of an all-solid-state battery, wherein the step corresponds to the distance from the upper surface of the die plate to the upper surface of the protective film. According to claim 7,
The manufacturing apparatus of an all-solid-state battery, wherein the length of the second cover to the bottom of the rubber pad is shorter than the length to the bottom of the rubber pad of the first cover by the step. According to claim 4,
An edge of the all-solid-state battery is disposed between the first cover and the second cover. Placing at least one plate-shaped material for an all-solid-state battery on a die plate;
wrapping and sealing the plate-shaped material for an all-solid-state battery and the die plate with a protective film;
Forming an all-solid-state battery by pressurizing the plate-shaped material for an all-solid-state battery;
A first cover is in close contact with the die plate spaced apart from the all-solid-state battery, and a second cover is in close contact with the all-solid-state battery, and then air is discharged through a vacuum head in communication with the first cover to cover the first cover. forming a vacuum by discharging air from an area between the first cover and the second cover; and
A method of manufacturing an all-solid-state battery, comprising releasing the vacuum after a preset time and removing the protective film. An all-solid-state battery made by the manufacturing method of claim 10.