All-solid-state battery and method for manufacturing an all-solid-state battery

Abstract

The present invention provides an all-solid-state battery and a method for manufacturing an all-solid-state battery that can prevent damage to the electrode tabs during isotropic pressurization. [Solution] The device includes a first electrode current collector comprising a first electrode body and a first electrode tab, and a plurality of first electrodes comprising a first electrode active material provided on the first electrode current collector; a second electrode current collector comprising a second electrode body and a second electrode tab, and a plurality of second electrodes comprising a second electrode active material provided on the second electrode current collector; and a solid electrolyte provided between the first electrode and the second electrode. Each of the first electrode tabs and second electrode tabs protrudes from the first electrode body and the second electrode body in a second direction intersecting a first direction. The portions in which the first electrode tabs of each of the plurality of first electrodes are in close contact, or the portions in which the second electrode tabs of each of the plurality of second electrodes are in close contact, can be formed spaced apart in the first direction from the first electrode or second electrode located at both ends of the first direction among the plurality of first electrodes and the plurality of second electrodes.

Description

Technical Field

[0006] , , ,

[0001] The present invention relates to all-solid-state batteries and a method for manufacturing all-solid-state batteries.

Background Art

[0002] Unlike primary batteries that cannot be charged after discharge, secondary batteries that can be repeatedly charged and discharged are applicable to various fields such as smartphones, automobiles, drones, and robots, and their importance is increasing day by day.

[0003] Conventional secondary batteries use a liquid as an electrolyte, so there is a problem that their stability decreases, such as expansion due to temperature changes and liquid leakage due to external shocks leading to explosions and fires. To solve such problems, research and development on all-solid-state batteries are being actively conducted.

[0004] In all-solid-state batteries, since the electrolyte located between the positive electrode active material and the negative electrode active material is solid, they are structurally highly stable and do not require a separator. As a result, there is an advantage that the battery can be further miniaturized and the energy density can be increased. However, in the case of all-solid-state batteries, expansion and contraction of the electrode active material occur during charge and discharge, which leads to limitations such as peeling of the interface between the electrode active material and the solid electrolyte and a decrease in performance.

[0005] Therefore, in order to prevent the interface between the electrode active material and the solid electrolyte from peeling, a process of isotropically pressurizing the all-solid-state battery can be performed. At this time, there is an increasing need for a structure to prevent damage to the electrode tab of the electrode current collector during isotropic pressurization.

Summary of the Invention

Problems to be Solved by the Invention

[0006] An embodiment of the present invention aims to provide an all-solid-state battery and a method for manufacturing an all-solid-state battery that can prevent damage to the electrode tab during isotropic pressurization. The technical problems of the present invention are not limited to those mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] An all-solid-state battery according to an embodiment of the present invention includes: a first electrode current collector each including a first electrode body and a first electrode tab; a plurality of first electrodes including a first electrode active material provided on the first electrode current collector; a plurality of second electrodes including a second electrode body and a second electrode tab, each composed of electrodes different from the first electrodes and stacked alternately with the first electrodes along a first direction; and a solid electrolyte provided between the first electrodes and the second electrodes. Each of the first electrode tabs and the second electrode tabs protrudes from the first electrode body and the second electrode body in a second direction intersecting the first direction. The portions in which the first electrode tabs of each of the plurality of first electrodes are in close contact, or the portions in which the second electrode tabs of each of the plurality of second electrodes are in close contact, are formed spaced apart in the first direction from the first electrode or second electrode located at both ends of the first direction among the plurality of first electrodes and the plurality of second electrodes.

[0008] The first electrode tabs of each of the plurality of first electrodes can be in close contact with each other on one side of the first electrode body and the second electrode body in the second direction, and the second electrode tabs of each of the plurality of second electrodes can be in close contact with each other on the other side of the first electrode body and the second electrode body in the second direction.

[0009] The area of ​​the first electrode active material can be made larger than the area of ​​the second electrode active material.

[0010] An all-solid-state battery according to an embodiment of the present invention may further include an edge member positioned along the periphery of the second electrode active material and in contact with the second electrode tab.

[0011] The first electrode may be a negative electrode and the second electrode may be a positive electrode.

[0012] A method for manufacturing an all-solid-state battery according to an embodiment of the present invention involves stacking at least one first electrode, at least one second electrode composed of an electrode different from the first electrode, and at least one solid electrolyte provided between the first electrode and the second electrode along a first direction; stacking the at least one first electrode, the at least one second electrode, and the at least one solid electrolyte on a jig plate and packaging them with an outer packaging material; and packaging the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode together. The present invention comprises applying pressure in one direction, wherein the first electrode comprises a first electrode current collector having a first electrode body and a first electrode tab protruding from the first electrode body in a second direction intersecting the first direction, and the second electrode comprises a second electrode current collector having a second electrode body and a second electrode tab protruding from the second electrode body in a second direction, and when the at least one first electrode, the at least one second electrode, and the at least one solid electrolyte are stacked, the first electrode tab and the second electrode tab may be spaced apart from the jig plate in the first direction.

[0013] The ends of the jig plate in the second direction may be positioned inward in the second direction from the ends of the first electrode body in the second direction, or they may be positioned in a position corresponding to the first direction to the positions of the ends of the first electrode body in the second direction.

[0014] The two ends of the jig plate in the second direction can be positioned between the two ends of the first electrode body in the second direction and the two ends of the second electrode body in the second direction.

[0015] The packaging of the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the outer packaging material may include further placing a protective film between the first electrode or the second electrode located at one end in the first direction and the jig plate, and packaging the protective film together with the outer packaging material.

[0016] The two ends of the protective film in the second direction may be positioned outside the two ends of the jig plate in the second direction, or they may be positioned in a location corresponding to the position of the two ends of the jig plate in the second direction and the first direction.

[0017] The packaging of the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the outer packaging material may further include packaging the at least one first electrode and the at least one second electrode in an inner outer packaging material, and then packaging the inner outer packaging material and the jig plate together with the outer packaging material.

[0018] The jig plate includes a jig plate body and jig plate covers disposed on both sides of the jig plate body in the second direction, and the jig plate covers may be made of an elastic material.

[0019] The ends of the jig plate in the second direction may be positioned inward in the second direction from the ends of the first electrode body in the second direction, or they may be positioned in a position corresponding to the first direction to the positions of the ends of the first electrode body in the second direction.

[0020] The two ends of the jig plate cover in the second direction can be positioned between the two ends of the first electrode body in the second direction and the two ends of the second electrode body in the second direction.

[0021] The manufacturing method of the all-solid-state battery according to an embodiment of the present invention may further include, after pressing the packaged at least one first electrode, the at least one solid electrolyte, and the at least one second electrode, removing the packaging of the exterior material, and further laminating a plurality of the first electrodes, the solid electrolytes, and the second electrodes provided respectively.

[0022] The manufacturing method of the all-solid-state battery according to an embodiment of the present invention may further include, after laminating the plurality of first electrodes, the plurality of solid electrolytes, and the plurality of second electrodes, adhering the first electrode tabs of each of the plurality of first electrodes to be in close contact and joining them to a first lead, and adhering the second electrode tabs of each of the plurality of second electrodes to be in close contact and joining them to a second lead.

[0023] The manufacturing method of the all-solid-state battery according to an embodiment of the present invention may further include packaging together the laminated plurality of first electrodes, the plurality of solid electrolytes, and the plurality of second electrodes.

Advantages of the Invention

[0024] In this technology, since the isotropic pressing process is performed with the electrode tabs separated from the jig plate, breakage of the electrode tabs can be prevented, and the productivity of the all-solid-state battery can be improved.

[0025] In addition to this, various effects that can be directly or indirectly understood from this document can be provided.

Brief Description of the Drawings

[0026] [Figure 1] It is a vertical cross-sectional view of an all-solid-state battery according to an embodiment of the present invention. [Figure 2] It is a flowchart of a manufacturing method of an all-solid-state battery according to an embodiment of the present invention. [Figure 3] It is a vertical cross-sectional view of a unit pressure-laminated body in a pressing step during a manufacturing method of an all-solid-state battery according to an embodiment of the present invention. [Figure 4]This is a vertical cross-sectional view of a unit pressure stack in the pressurization step of a manufacturing method for an all-solid-state battery according to another embodiment of the present invention. [Figure 5] This is a vertical cross-sectional view of a unit pressure stack in the pressurization step of a manufacturing method for an all-solid-state battery according to another embodiment of the present invention. [Figure 6] This is a vertical cross-sectional view of a unit pressure laminate in the pressurization step of a manufacturing method for an all-solid-state battery according to yet another embodiment of the present invention. [Figure 7] This is a vertical cross-sectional view of a unit pressure laminate in the pressurization step of a manufacturing method for an all-solid-state battery according to yet another embodiment of the present invention. [Figure 8] This is a vertical cross-sectional view of a unit pressure laminate in the pressurization step of a manufacturing method for an all-solid-state battery according to yet another embodiment of the present invention. [Modes for carrying out the invention]

[0027] Hereinafter, some embodiments of the present invention will be described in detail with reference to illustrative drawings. It should be noted that, when assigning reference numerals to components in each drawing, the same reference numerals will be used for the same components whenever possible, even when they appear in other drawings. Furthermore, when describing embodiments of the present invention, if a specific description of a related known configuration or function is deemed to hinder understanding of the embodiments of the present invention, such detailed description will be omitted.

[0028] In describing the components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. Such terms are merely for distinguishing a component from other components, and do not limit the nature, order, or sequence of the component. Furthermore, unless otherwise specifically defined, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0029] The embodiments of the present invention will be described in detail below with reference to Figures 1 to 8.

[0030] Figure 1 is a vertical cross-sectional view of an all-solid-state battery according to one embodiment of the present invention.

[0031] Referring to Figure 1, the all-solid-state battery 100 may include a first electrode 200, a second electrode 300 stacked on the first electrode 200 and having a different electrode configuration from the first electrode 200, and a rear casing material 110 formed to enclose the first electrode 200 and the second electrode 300. The first electrode 200 may be a negative electrode, and the second electrode 300 may be a positive electrode.

[0032] The all-solid-state battery 100 can have a plurality of first electrodes 200 and a plurality of second electrodes 300 stacked alternately in a first direction (the X direction or the opposite direction of the X direction). The first electrode 200 may include a first electrode current collector 210 and a first electrode active material 240 provided on the first electrode current collector 210. The first electrode active material 240 may be provided on both sides of the first electrode current collector 210 facing both sides in the first direction (the X direction or the opposite direction of the X direction), or alternatively, the first electrode active material 240 may be provided on only one side of the first electrode current collector 210.

[0033] The second electrode 300 may include a second electrode current collector 310 and a second electrode active material 340 provided on the second electrode current collector 310. The second electrode active material 340 may be provided on both sides of the second electrode current collector 310 facing both sides in the first direction (X direction or the opposite direction of X direction), or alternatively, the second electrode active material 340 may be provided on only one side of the second electrode current collector 310.

[0034] The first electrode current collector 210 may be made of nickel (Ni), but is not limited thereto. The second electrode current collector 310 may be made of aluminum (Al), but is not limited thereto.

[0035] The first electrode current collector 210 may include a first electrode body 220 and a first electrode tab 230 protruding from the first electrode body 220 to one side in the second direction (Y direction). The second electrode current collector 310 may include a second electrode body 320 and a second electrode tab 330 protruding from the second electrode body 320 to the other side in the second direction (opposite direction to the Y direction).

[0036] The first electrode body 220 of the first electrode current collector 210 may be the portion coated with the first electrode active material 240. Similarly, the second electrode body 320 of the second electrode current collector 310 may be the portion coated with the second electrode active material 340.

[0037] The portion where the first electrode tabs 230 of each of the multiple first electrodes 200 are in close contact can be formed spaced apart in the first direction from the first electrodes 200 or second electrodes 300 located at both ends in the first direction among the multiple first electrodes 200 and multiple second electrodes 300.

[0038] More specifically, the multiple first electrode tabs 230 can be in close contact with each other on one side (Y direction) of the multiple first electrode bodies 220 and the multiple second electrode bodies 320 in the second direction. The multiple first electrode tabs 230 that are in close contact with each other can be connected to the first lead 120.

[0039] Furthermore, the portions where the second electrode tabs 330 of each of the multiple second electrodes 300 are in close contact can be formed spaced apart in the first direction from the first electrodes 200 or second electrodes 300 located at both ends in the first direction among the multiple first electrodes 200 and the multiple second electrodes 300.

[0040] More specifically, the multiple second electrode tabs 330 can be in close contact with each other on the other side of the second direction (opposite direction in the Y direction) of the multiple first electrode bodies 220 and the multiple second electrode bodies 320. The multiple second electrode tabs 330 that are in close contact with each other can be connected to the second lead 130.

[0041] The rear casing material 110 of the all-solid-state battery 100 can be formed to enclose both the stacked first electrode 200 and second electrode 300, and a portion of the first and second leads 120 and 130.

[0042] On the other hand, the all-solid-state battery 100 may include a solid electrolyte 500 provided between the first electrode 200 and the second electrode 300. Unlike lithium-ion batteries, the all-solid-state battery 100 can have a solid electrolyte 500 in a solid state between the first electrode 200 and the second electrode 300 without another separator. The all-solid-state battery 100 can be manufactured by a process of coating or transferring the solid electrolyte 500 to one side of the first electrode 200 that faces the second electrode 300.

[0043] Unlike lithium-ion batteries, all-solid-state batteries 100 have solid electrolyte particles 500 composed of solid-phase particles. Therefore, in order to form an interface between the solid electrolyte 500 and the first electrode 200, or between the solid electrolyte 500 and the second electrode 300, the first electrode 200 and the second electrode 300 must be pressurized in the direction in which they are stacked. As an example, all-solid-state batteries require an isotropic pressurization process in which isotropic pressurization (WIP) is performed.

[0044] Furthermore, when the first electrode 200 and the second electrode 300 are viewed separated in the first direction, the size of the first electrode body 220 can be made larger than the size of the second electrode body 320. In other words, the area of ​​the first electrode active material 240 can be made larger than the area of ​​the second electrode active material 340.

[0045] This is to prevent a short circuit between the first electrode 200 and the second electrode 300, which can occur as lithium crystals are repeatedly charged and discharged from the all-solid-state battery 100, forming dentites on the surface of the first electrode 200 and accumulating as nuclei.

[0046] To prevent this, the area formed on the first electrode body 220 of the first electrode active material 240 can be made larger than the area formed on the second electrode body 320 of the second electrode active material 340.

[0047] As mentioned above, in order to prevent the first electrode tab 230 and the second electrode tab 330 from being damaged due to the area difference between the first electrode active material 240 and the second electrode active material 340, the all-solid-state battery 100 may include an edge member 400 positioned along the periphery of the second electrode active material 340 and in contact with the second electrode tab 330.

[0048] The edge member 400 can be formed to support the first electrode active material 240 which is positioned outside the second electrode active material 340 in a second direction (Y direction or opposite to the Y direction) and in a third direction (both directions perpendicular to the X direction and the Y direction). The edge member 400 may, but is not limited to, polyethylene terephthalate (PET).

[0049] Figure 2 is a flowchart of a method for manufacturing an all-solid-state battery according to one embodiment of the present invention. Figure 3 is a vertical cross-sectional view of a unit pressure laminate in the pressurization step in the method for manufacturing an all-solid-state battery according to one embodiment of the present invention.

[0050] Referring to Figures 2 and 3, the manufacturing method for the all-solid-state battery 100 (see Figure 1) may include a stacking step (S10), an intermediate packaging step (S20), a pressurizing step (S30), a post-stacking step (S40), a connection step (S50), and a post-packaging step (S60).

[0051] The lamination step (S10) may be a step of laminating at least one first electrode 200, at least one second electrode 300, and at least one solid electrolyte 500 provided between the first electrode 200 and the second electrode 300 along a first direction.

[0052] Furthermore, the lamination step (S10) may include bringing the edge member 400, which extends along the periphery of the second electrode active material 340, into contact with the second electrode tab 330. In the lamination step (S10), the first electrode 200 may be provided in a pair, and the second electrode 300 may be provided as a single unit, but is not limited to this.

[0053] The intermediate packaging step (S20) may be a step in which, after the lamination step (S10), at least one first electrode 200, at least one second electrode 300, and at least one solid electrolyte 500 are laminated onto a jig plate 600 and then packaged with outer packaging material 700.

[0054] The pressurizing step (S30) may be a step in which at least one first electrode 200 and at least one second electrode 300 are pressurized in a first direction (X direction or the opposite direction of X direction) after the intermediate packaging step (S20), as shown in Figure 3. The pressurizing step (S30) may also be a step in which the isotropic pressurizing step described above is performed.

[0055] In other words, the pressurizing step (S30) may be a step of pressurizing the packaged at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 in a first direction. At this time, the at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 may be supported on a jig plate 600 and packaged together with the jig plate 600.

[0056] The pressurizing step (S30) may be a step in which the interfaces between the first electrode 200 and the solid electrolyte 500, and between the second electrode 300 and the solid electrolyte 500, are pressurized in a first direction to a magnitude of 450 MPa in an environment of 100°C.

[0057] As shown in Figure 3, the unit pressure laminate 100a may include at least one first electrode 200, at least one second electrode 300, at least one solid electrolyte 500, and a jig plate 600. The unit pressure laminate 100a may also include an outer packaging material 700 that packages at least one first and second electrode 200, 300, and the jig plate 600 together.

[0058] When at least one first electrode 200, at least one second electrode 300, and at least one solid electrolyte 500 are stacked on a jig plate 600, the first electrode tabs 230 and the second electrode tabs 330 can be positioned spaced apart from the jig plate 600 in a first direction. More specifically, at least one first electrode tab 230 and at least one second electrode tab 330 can be positioned spaced apart from both ends of the jig plate 600 in a second direction in a first direction.

[0059] On the other hand, both ends of the jig plate 600 in the second direction can be positioned inward in the second direction than both ends of the first electrode body 220 in the second direction, or they can be positioned in a position corresponding to the first direction to the positions of both ends of the first electrode body 220 in the second direction.

[0060] In other words, the length of the first electrode body 220 in the second direction (L2) and the length of the jig plate 600 in the second direction (L1) can be formed to be equal, or a difference of 1 mm can be formed. Furthermore, the first electrode body 220 and the jig plate 600 can be arranged so that they do not protrude from each other in the second direction.

[0061] With this structure, when isotropic pressurization is performed in the first direction during the pressurization step (S30), the jig plate 600 can pressurize the first electrode body 220 and the second electrode body 320, while not pressurizing at least one first electrode tab 230 and at least one second electrode tab 330.

[0062] If, during the pressurizing step (S30), at least one first electrode tab 230 and at least one second electrode tab 330 do not come into contact with the jig plate 600, damage to the first electrode tab 230 and the second electrode tab 330 can be prevented, thereby improving the productivity of the all-solid-state battery 100 (see Figure 1).

[0063] The post-lamination step (S40) may be a step in which, after the pressurizing step (S30), the packaging of the outer material 700 is removed, and the multiple first electrodes 200 and second electrodes 300 are further laminated as shown in Figure 1.

[0064] The post-lamination step (S40) may include providing a solid electrolyte 500 between the first electrode 200 and the second electrode 300.

[0065] In other words, the post-lamination step (S40) may be a step in which, after pressurizing the packaged at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300, the packaging of the outer material 700 is removed, and the multiple first electrodes 200, solid electrolyte 500, and second electrodes 300 are further laminated.

[0066] The connection step (S50) may be a step performed after the post-lamination step (S40) in which the first electrode tabs 230 of each of the multiple first electrodes 200 are brought into close contact with each other to bond them to the first lead 120, and the second electrode tabs 330 of each of the multiple second electrodes 300 are brought into close contact with each other to bond them to the second lead 130.

[0067] In other words, the connection step (S50) may be a step in which, after stacking a plurality of first electrodes 200, a plurality of solid electrolytes 500, and a plurality of second electrodes 300, the first electrode tabs 230 of each of the plurality of first electrodes 200 are brought into close contact with each other to join them to the first lead 120, and the second electrode tabs 330 of each of the plurality of second electrodes 300 are brought into close contact with each other to join them to the second lead 130.

[0068] The post-packaging step (S60) may be a step in which, after the connection step (S50), the stacked multiple first electrodes 200 and multiple second electrodes 300 are both wrapped in the post-packaging material 110.

[0069] In other words, the post-packaging step (S60) may be a step of packaging the stacked multiple first electrodes 200, multiple solid electrolytes 500, and multiple second electrodes 300 together with the post-packaging material 110.

[0070] Figure 4 is a vertical cross-sectional view of a unit pressure stack in the pressurization step during the manufacturing method of an all-solid-state battery according to another embodiment of the present invention.

[0071] Referring to Figure 4, the unit pressure laminate 100b differs from the unit pressure laminate 100a shown in Figure 3 in the length (L1) of the jig plate 600 in the second direction and the arrangement of the jig plate 600.

[0072] The jig plate 600 can be positioned on the central region of the first electrode 200 in the second direction. Configurations and structures not mentioned in Figure 4 shall be based on the structure in Figure 3.

[0073] More specifically, the length of the jig plate 600 in the second direction (L1) can be formed to be smaller than the length of the first electrode body 220 in the second direction (L2) and longer than the length of the second electrode body 320 in the second direction (L3).

[0074] The ends of the jig plate 600 in the second direction can be positioned between the ends of the first electrode body 220 in the second direction and the ends of the second electrode body 320 in the second direction.

[0075] Even with this structure, in the pressurizing step (S30), the jig plate 600 can pressurize the first electrode body 220 and the second electrode body 320, but not pressurize at least one first electrode tab 230 and at least one second electrode tab 330. Therefore, since at least one first electrode tab 230 and at least one second electrode tab 330 are prevented from coming into contact with the jig plate 600, damage to the first electrode tab 230 and the second electrode tab 330 can be prevented, and the productivity of the all-solid-state battery 100 (see Figure 1) can be improved.

[0076] Figure 5 is a vertical cross-sectional view of a unit pressure stack in the pressurization step during the manufacturing method of an all-solid-state battery according to another embodiment of the present invention.

[0077] Referring to Figure 5, the unit pressure laminate 100c may further include a protective film 800 compared to the unit pressure laminate 100a shown in Figure 3.

[0078] In other words, the intermediate packaging step (S20, see Figure 2) of the all-solid-state battery 100 (see Figure 1) may include further placing a protective film 800 between the jig plate 600 and either the first electrode 200 or the second electrode 300 located at one end in the first direction, among at least one first electrode 200 and at least one second electrode.

[0079] In other words, according to the structure shown in Figure 5, packaging the at least one first electrode 200, the at least one solid electrolyte 500, and the at least one second electrode 300 with the outer packaging material 700 may include further placing a protective film 800 between the first electrode 200 or the second electrode 300 located at one end in the first direction and the jig plate 600, and packaging the protective film 800 together with the outer packaging material 700.

[0080] For configurations and structures not mentioned in Figure 5, refer to the structure in Figure 3.

[0081] The protective film 800 is laminated on the jig plate 600, and at least one first and second electrode 200, 300 can be laminated on the protective film 800. The protective film 800 may be made of a polymer material and may be configured to prevent at least one first and second electrode 200, 300 from being pressed with strong force from the jig plate 600.

[0082] The protective film 800 may be made of polyimide, but is not limited thereto, and should be configured to buffer the pressure transmitted from the jig plate 600 to at least one first and second electrode 200, 300 between the jig plate 600 and at least one first and second electrode 200, 300.

[0083] The ends of the protective film 800 in the second direction can be positioned outside the ends of the jig plate 600 in the second direction, or they can be positioned in a location corresponding to the positions of the ends of the jig plate 600 in the second direction and the first direction.

[0084] In other words, the length of the protective film 800 in the second direction (L4) can be formed to be longer than the length of the jig plate 600 in the second direction (L1). In this case, the length of the jig plate 600 in the second direction (L1) can be formed to be equal to the length of the first electrode body 220 in the second direction (L2, see Figure 3).

[0085] With this structure, in the pressurizing step (S30), the jig plate 600 can pressurize the first electrode body 220 and the second electrode body 320 through the protective film 800, while not pressurizing at least one first electrode tab 230 and at least one second electrode tab 330. Therefore, it is possible to prevent at least one first electrode tab 230 and at least one second electrode tab 330 from being damaged by the jig plate 600, thereby improving the productivity of the all-solid-state battery 100.

[0086] Figure 6 is a vertical cross-sectional view of a unit pressure stack in the pressurization step during a manufacturing method for an all-solid-state battery according to yet another embodiment of the present invention.

[0087] Referring to Figure 6, the unit pressure laminate 100d may include an inner outer covering material 710 that encloses at least one first and second electrode 200, 300. The inner outer covering material 710 may be configured to enclose at least one first and second electrode 200, 300 before it is laminated onto the jig plate 600.

[0088] For configurations and structures not mentioned in Figure 6, refer to the structure in Figure 3.

[0089] At least one first and second electrode 200, 300 can be wrapped in the inner outer material 710 and then stacked on the jig plate 600. Subsequently, at least one first and second electrode 200, 300, the inner outer material 710, and the jig plate 600 can be wrapped in the outer material 700.

[0090] In this case, the length of the jig plate 600 in the second direction (L1) and the length of the first electrode body 220 in the second direction (L2) can be formed to be equal, or a difference of 1 mm can be formed. Furthermore, both ends of the jig plate 600 in the second direction can be positioned at positions corresponding to the positions of both ends of the first electrode 200 in the second direction and in the first direction.

[0091] In other words, the intermediate packaging step (S20) of the unit pressure laminate 100d in Figure 6 may include packaging by wrapping at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 with the inner outer packaging material 710, and then wrapping the inner outer packaging material 710 and the jig plate 600 together with the outer packaging material 700.

[0092] In other words, packaging at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 with outer packaging material 700 may include packaging at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 by wrapping them with inner outer packaging material 710, and then wrapping both the inner outer packaging material 710 and the jig plate 600 with outer packaging material 700.

[0093] With this structure, in the pressurizing step (S30), the jig plate 600 can pressurize the first electrode body 220 and the second electrode body 320, while not pressurizing at least one first electrode tab 230 and at least one second electrode tab 330. Therefore, damage to at least one first electrode tab 230 and at least one second electrode tab 330 can be prevented, thereby improving the productivity of the all-solid-state battery 100 (see Figure 1).

[0094] Figure 7 is a vertical cross-sectional view of a unit pressure stack in the pressurization step of a manufacturing method for an all-solid-state battery according to yet another embodiment of the present invention.

[0095] Referring to Figure 7, the jig plate 600 of the unit pressure laminate 100e may include a jig plate body 610 and a jig plate cover 620. Configurations and structures not mentioned in Figure 7 shall be based on the structures in Figure 3.

[0096] The length of the jig plate 600 in the second direction (L1) and the length of the first electrode body 220 in the second direction (L2) can be formed to be equal, or a difference of 3 mm can be formed.

[0097] The jig plate cover 620 can be positioned on both sides of the jig plate body 610 in the second direction. The jig plate cover 620 may be made of an elastic material. The jig plate cover 620 may be configured to prevent at least one first electrode tab 230 and at least one second electrode tab 330 from contacting and damaging the jig plate body 610.

[0098] In other words, the jig plate cover 620 is made of a material that is more elastic than the jig plate body 610, and when the isotropic pressurization process of the unit pressurized laminate 100e is performed in the pressurizing step (S30), damage can be prevented even if at least one first electrode tab 230 and at least one second electrode tab 330 come into contact with the jig plate cover 620.

[0099] Furthermore, since at least one first electrode body 220 and at least one second electrode body 320 are pressurized in a first direction from the jig plate body 610, the interfaces between the first electrode 200 and the solid electrolyte 500, and between the second electrode 300 and the solid electrolyte 500 can be maximized.

[0100] Even in this case, during the pressurizing step (S30), the jig plate 600 can pressurize the first electrode body 220 and the second electrode body 320, but not pressurize at least one first electrode tab 230 and at least one second electrode tab 330. Therefore, it is possible to prevent at least one first electrode tab 230 and at least one second electrode tab 330 from being damaged by the jig plate 600, thereby improving the productivity of the all-solid-state battery 100.

[0101] Figure 8 is a vertical cross-sectional view of a unit pressure stack in the pressurization step of a manufacturing method for an all-solid-state battery according to yet another embodiment of the present invention.

[0102] Referring to Figure 8, the jig plate 600 of the unit pressure laminate 100f may include a jig plate body 610 and a jig plate cover 620. Configurations and structures not mentioned in Figure 8 shall be based on the structures in Figure 3.

[0103] The length (L1) of the jig plate 600 in the second direction can be formed to be smaller than the length (L2) of the first electrode body 220 in the second direction, and larger than the length (L3) of the second electrode body 320 in the second direction.

[0104] The ends of the jig plate 600 in the second direction can be positioned inward in the second direction from the ends of the first electrode body 220 in the second direction, or they can be positioned in a position corresponding to the first direction to the positions of the ends of the first electrode body 220 in the second direction.

[0105] More specifically, both ends of the jig plate cover 620 in the second direction can be positioned between both ends of the first electrode body 220 in the second direction and both ends of the second electrode body 320 in the second direction.

[0106] The ends of the jig plate 600 in the second direction can be positioned inward in the second direction relative to the ends of the first electrode body 220 in the second direction, and outward in the second direction relative to the ends of the second electrode body 320 in the second direction.

[0107] Even in this case, during the pressurizing step (S30), the jig plate 600 can pressurize the first electrode body 220 and the second electrode body 320, but not pressurize at least one first electrode tab 230 and at least one second electrode tab 330. Therefore, it is possible to prevent at least one first electrode tab 230 and at least one second electrode tab 330 from being damaged by the jig plate 600, thereby improving the productivity of the all-solid-state battery 100.

[0108] The following describes the potential damage rates of the first and second electrode tabs 230 and 330 that may occur during the isotropic pressurization process of the unit pressurized laminates 100a, 100b, 100c, 100d, 100e, and 100f shown in Figures 3 to 8, as well as the comparative examples, with reference to Table 1 below.

[0109] [Table 1]

[0110] Referring to Table 1, the rate of damage to the first and second electrode tabs 230, 330 that may occur during the isotropic pressurization process performed for 30 minutes in a 100°C environment for each embodiment of the present invention, 100a, 100b, 100c, 100d, 100e, 100f, and comparative examples can be confirmed.

[0111] Here, in the comparative example, both ends of the jig plate in the second direction can be positioned further outward in the second direction than both ends of the first electrode body in the second direction. It can be confirmed that the failure rate of the first electrode tab in the comparative example due to the isotropic pressurization process is 50%, and the failure rate of the second electrode tab is 92%.

[0112] In contrast, it can be confirmed that the unit pressure laminate 100a shown in Figure 3 has a failure rate of 4% for the first electrode tab 230 and a failure rate of 12% for the second electrode tab 330 due to the isotropic pressurization process.

[0113] Figure 4 shows that the unit pressure laminate 100b exhibits a 4% failure rate for the first electrode tab 230 and a 9% failure rate for the second electrode tab 330 during the isotropic pressurization process.

[0114] Figure 5 shows that the unit pressure laminate 100c exhibits a 2% failure rate for the first electrode tab 230 and a 4% failure rate for the second electrode tab 330 due to the isotropic pressurization process.

[0115] Figure 6 shows that the unit pressure laminate 100d exhibits a 3% failure rate for the first electrode tab 230 and a 3% failure rate for the second electrode tab 330 during the isotropic pressurization process.

[0116] Figure 7 shows that the unit pressure laminate 100e exhibits a 2% failure rate for the first electrode tab 230 and a 4% failure rate for the second electrode tab 330 due to the isotropic pressurization process.

[0117] Figure 8 shows that the unit pressure laminate 100f exhibits a 4% failure rate for the first electrode tab 230 and a 6% failure rate for the second electrode tab 330 during the isotropic pressurization process.

[0118] This confirms that the rate of damage to the first and second electrode tabs 230 and 330 that may occur during the isotropic pressurization process of the unit pressurized laminates 100a, 100b, 100c, 100d, 100e, and 100f is significantly reduced compared to the comparative example. Therefore, the manufacturing method of the all-solid-state battery 100 (see Figure 1) according to the present invention can improve the productivity of the all-solid-state battery 100.

[0119] The aforementioned unit pressure laminates 100a, 100b, 100c, 100d, 100e, and 100f are not limited to the structures shown in Figures 3 to 8. For example, the first and second electrode tabs 230 and 330 of the unit pressure laminates 100a, 100b, 100c, 100d, 100e, and 100f may extend in a first direction and be formed in close contact with at least one first electrode 200 and at least one second electrode 300 on both sides in a second direction.

[0120] The above description is merely illustrative of the technical concept of the present invention, and any person with ordinary skill in the art to which the present invention belongs can make various modifications and alterations without departing from the essential characteristics of the present invention.

[0121] Therefore, the embodiments disclosed herein are for illustrative purposes only, not to limit the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention must be interpreted in accordance with the claims described below, and all technical concepts within an equivalent scope should be interpreted as being included within the scope of the rights of the present invention. [Explanation of symbols]

[0122] 100: All-solid-state battery 100a, 100b, 100c, 100d, 100e, 100f: Unit pressure laminate 110: Rear exterior material 120: First lead 130: Second lead 200: 1st electrode 210: First electrode current collector 220: First electrode body 230: First electrode tab 240: First electrode active material 300: 2nd electrode 310: Second electrode current collector 320: Second electrode body 330: Second electrode tab 340: Second electrode active material 400: Edge member 500: Solid electrolyte 600: Jig Plate 610: Jig Plate Body 620: Jig Plate Cover 700: Exterior materials 710: Interior exterior material 800: Protective film L1: Length of the jig plate in the second direction L2: Length of the first electrode body in the second direction L3: Length of the second electrode body in the second direction L4: Length of the protective film in the second direction S10: Laminated step S20: Intermediate packaging step S30: Pressurized step S40: Rear stacking step S50: Connection Step S60: Post-packaging step

Claims

1. A first electrode current collector comprising a first electrode body and a first electrode tab, and a plurality of first electrodes comprising a first electrode active material provided on the first electrode current collector, A second electrode current collector comprising a second electrode body and a second electrode tab, each composed of electrodes different from the first electrode and stacked alternately with the first electrode along a first direction, and provided on the second electrode current collector, and a plurality of second electrodes comprising a second electrode active material, A solid electrolyte provided between the first electrode and the second electrode, Includes, Each of the first electrode tab and the second electrode tab protrudes from the first electrode body and the second electrode body in a second direction intersecting the first direction, All-solid-state battery, wherein the portion where the first electrode tabs of each of the plurality of first electrodes are in close contact, or the portion where the second electrode tabs of each of the plurality of second electrodes are in close contact, is formed spaced apart in the first direction from the first electrode or second electrode located at both ends in the first direction among the plurality of first electrodes and the plurality of second electrodes.

2. Each of the multiple first electrodes has a first electrode tab that is in close contact with the first electrode body and the second electrode body on one side in the second direction. The all-solid-state battery according to claim 1, wherein the second electrode tabs of each of the plurality of second electrodes are in close contact with each other on the other side of the first electrode body and the second electrode body in the second direction.

3. The all-solid-state battery according to claim 2, wherein the area of ​​the first electrode active material is formed to be larger than the area of ​​the second electrode active material.

4. The all-solid-state battery according to claim 2, further comprising an edge member disposed along the periphery of the second electrode active material and in contact with the second electrode tab.

5. The first electrode is the negative electrode, The all-solid-state battery according to claim 1, wherein the second electrode is the positive electrode.

6. A stack of at least one first electrode, at least one second electrode composed of an electrode different from the first electrode, and at least one solid electrolyte provided between the first electrode and the second electrode, along a first direction, The at least one first electrode, the at least one second electrode, and the at least one solid electrolyte are stacked on a jig plate and packaged with an outer packaging material. Pressurizing the packaged at least one first electrode, the at least one solid electrolyte, and the at least one second electrode in the first direction, Includes, The first electrode includes a first electrode current collector having a first electrode body and a first electrode tab protruding from the first electrode body in a second direction intersecting the first direction, The second electrode includes a second electrode current collector having a second electrode body and a second electrode tab protruding from the second electrode body in the second direction. A method for manufacturing an all-solid-state battery, wherein when the at least one first electrode, the at least one second electrode, and the at least one solid electrolyte are stacked on the jig plate, the first electrode tab and the second electrode tab are arranged spaced apart from the jig plate in the first direction.

7. The two ends of the jig plate in the second direction are A method for manufacturing an all-solid-state battery according to claim 6, wherein the electrode is positioned inside the second direction beyond both ends of the first electrode body in the second direction, or is positioned at a location corresponding to the first direction and the positions of both ends of the first electrode body in the second direction.

8. The two ends of the jig plate in the second direction are A method for manufacturing an all-solid-state battery according to claim 6, wherein the first electrode body is positioned between both ends in the second direction and the second electrode body in the second direction.

9. The packaging of the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the outer packaging material is A method for manufacturing an all-solid-state battery according to claim 6, further comprising placing a protective film between the first electrode or the second electrode located at one end in the first direction, among the at least one first electrode and the at least one second electrode, and the jig plate, and packaging the protective film together with the outer packaging material.

10. The two ends of the protective film in the second direction are A method for manufacturing an all-solid-state battery according to claim 9, wherein the jig plate is positioned outside the second direction beyond both ends of the jig plate in the second direction, or is positioned at a location corresponding to the positions of both ends of the jig plate in the second direction and the first direction.

11. The packaging of the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the outer packaging material is A method for manufacturing an all-solid-state battery according to claim 6, further comprising wrapping the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with an inner outer material, and then packaging the inner outer material and the jig plate together with the outer material.

12. The aforementioned jig plate is, Jig plate body and The jig plate body includes jig plate covers disposed on both sides of the jig plate body in the second direction, The method for manufacturing an all-solid-state battery according to claim 6, wherein the jig plate cover is made of an elastic material.

13. The two ends of the jig plate in the second direction are A method for manufacturing an all-solid-state battery according to claim 12, wherein the electrode is positioned inside the second direction beyond both ends of the first electrode body in the second direction, or is positioned at a location corresponding to the first direction and the positions of both ends of the first electrode body in the second direction.

14. The two ends of the jig plate cover in the second direction are A method for manufacturing an all-solid-state battery according to claim 12, wherein the first electrode body is positioned between both ends in the second direction and the second electrode body is positioned between the two ends in the second direction.

15. A method for manufacturing an all-solid-state battery according to claim 6, further comprising pressing the packaged at least one first electrode, the at least one solid electrolyte, and the at least one second electrode, then unpacking the outer packaging, and further stacking the multiple first electrodes, the solid electrolyte, and the second electrodes, respectively.

16. A method for manufacturing an all-solid-state battery according to claim 15, further comprising stacking the plurality of first electrodes, the plurality of solid electrolytes, and the plurality of second electrodes, then bringing the first electrode tabs of each of the plurality of first electrodes into close contact and joining them to the first leads, and bringing the second electrode tabs of each of the plurality of second electrodes into close contact and joining them to the second leads.

17. A method for manufacturing an all-solid-state battery according to claim 16, further comprising packaging the stacked plurality of first electrodes, the plurality of solid electrolytes, and the plurality of second electrodes together with a rear outer packaging material.

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