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

Abstract

The present invention relates to an all-solid-state battery and a method for manufacturing an all-solid-state battery, the all-solid-state battery comprising: a plurality of first electrodes each comprising a first electrode current collector and a first electrode active material, the first electrode current collector comprising a first electrode body and a first electrode tab; each second electrode comprises a second electrode current collector and a second electrode active material, and the second electrode current collector comprises a second electrode main body and a second electrode pole piece; and a solid electrolyte provided between the first electrode and the second electrode, the first electrode tab and the second electrode tab protruding in the second direction from the first electrode body and the second electrode body, respectively, and the parts in tight connection with the respective first electrode plates of the plurality of first electrodes or the parts in tight connection with the respective second electrode plates of the plurality of second electrodes are formed to be separated from the first electrodes or the second electrodes located at the two ends of the first direction in the plurality of first electrodes and the plurality of second electrodes along the first direction.

Description

Technical Field

[0001] This invention relates to all-solid-state batteries and methods for manufacturing all-solid-state batteries. Background Technology

[0002] Unlike primary batteries, which cannot be recharged after being discharged, rechargeable batteries can be used in various fields such as smartphones, vehicles, drones, and robots, and their importance is increasing day by day.

[0003] Existing secondary batteries, which use liquids as electrolytes, suffer from poor stability. For example, they may explode or catch fire if they expand due to temperature changes or leak due to external impacts. To address this issue, research and development of all-solid-state batteries is being actively pursued.

[0004] In all-solid-state batteries, the electrolyte located between the positive and negative electrode active materials is made of solid material, resulting in high structural stability and potentially eliminating the need for a separator. This characteristic gives them the advantage of enabling battery miniaturization and further increasing energy density. However, all-solid-state batteries also have limitations: during charging and discharging, the electrode active materials expand and contract, which may cause the interface between the electrode active materials and the solid electrolyte to peel off, leading to performance degradation.

[0005] To address this issue, an isostatic pressing process can be applied to all-solid-state batteries to prevent the interface delamination between the electrode active material and the solid electrolyte. In this case, the necessity of a structure to prevent damage to the electrode plates of the current collector during isostatic pressing increases. Summary of the Invention

[0006] The embodiments of the present invention aim to provide an all-solid-state battery and a method for manufacturing an all-solid-state battery that can prevent damage to the electrode sheets under temperature isostatic pressure.

[0007] The technical problems of this invention are not limited to those mentioned above, and those skilled in the art can clearly understand other technical problems not mentioned from the following description.

[0008] An all-solid-state battery according to an embodiment of the present invention includes: a plurality of first electrodes, each first electrode including a first electrode current collector and a first electrode active material formed on the first electrode current collector, the first electrode current collector including a first electrode body and a first electrode sheet; a plurality of second electrodes having a different polarity from the first electrodes, stacked alternately with the first electrodes along a first direction, each second electrode including a second electrode current collector and a second electrode active material formed on the second electrode current collector, the second electrode current collector including a second electrode body and a second electrode sheet; and a solid electrolyte disposed between the first electrodes and the second electrodes, wherein the first electrode sheet and the second electrode sheet protrude from the first electrode body and the second electrode body respectively in a second direction intersecting the first direction, and the close-contact portions of the first electrode sheets of the plurality of first electrodes or the close-contact portions of the second electrode sheets of the plurality of second electrodes are spaced apart from the first electrodes or the second electrodes located at both ends of the first direction along the first direction.

[0009] The first electrode plates of each of the plurality of first electrodes are 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 plates 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.

[0010] The area of ​​the first electrode active material is larger than the area of ​​the second electrode active material.

[0011] The all-solid-state battery according to an embodiment of the present invention further includes an edge component, which is disposed along the periphery of the second electrode active material and in contact with the second electrode sheet.

[0012] The first electrode mentioned above is the negative electrode, and the second electrode mentioned above is the positive electrode.

[0013] A method for manufacturing an all-solid-state battery according to an embodiment of the present invention includes: stacking at least one first electrode, at least one second electrode having a polarity different from the first electrode, and at least one solid electrolyte disposed 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 onto a clamping plate and packaging them with an encapsulation material; and pressurizing the packaged at least one first electrode, the at least one solid electrolyte, and the at least one second electrode along the first direction; wherein the first electrode includes a first electrode current collector having a first electrode body and a first electrode plate protruding from the first electrode body into 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 plate protruding from the second electrode body into 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 on the clamping plate, the first electrode plate and the second electrode plate are configured to be spaced apart from the clamping plate along the first direction.

[0014] The two ends of the clamp in the second direction are configured to be closer to the inside of the second direction than the two ends of the first electrode body in the second direction, or the two ends of the clamp in the second direction are configured at positions corresponding to the positions of the two ends of the first electrode body in the second direction in the first direction.

[0015] The two ends of the clamp in the second direction are disposed 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.

[0016] The process of packaging the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the above-mentioned encapsulation material includes: further disposing a protective film between the first electrode or the second electrode located at one end in a first direction and the clamping plate, and packaging the protective film together with the above-mentioned encapsulation material.

[0017] The two ends of the protective film in the second direction are configured to be further outward in the second direction than the two ends of the clamp in the second direction, or the two ends of the protective film in the second direction are configured at positions corresponding to the positions of the two ends of the clamp in the second direction in the first direction.

[0018] The process of packaging the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the aforementioned encapsulation material includes: wrapping the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with an inner encapsulation material, and then packaging them together with the encapsulation material in such a way that the inner encapsulation material and the clamping plate are wrapped together.

[0019] The aforementioned clamp includes: a clamp body; and clamp covers disposed on both sides of the clamp body in a second direction; the clamp covers are elastic components.

[0020] The two ends of the clamp in the second direction are configured to be closer to the inside of the second direction than the two ends of the first electrode body in the second direction, or the two ends of the clamp in the second direction are configured at positions corresponding to the positions of the two ends of the first electrode body in the second direction in the first direction.

[0021] The two ends of the aforementioned clamp cover in the second direction are disposed 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.

[0022] The method for manufacturing an all-solid-state battery based on an embodiment of the present invention further includes: pressurizing the packaged at least one first electrode, at least one solid electrolyte, and at least one second electrode, then removing the packaging of the encapsulation material, and further stacking a plurality of first electrodes, a plurality of solid electrolytes, and a plurality of second electrodes.

[0023] The method for manufacturing an all-solid-state battery according to an embodiment of the present invention further includes: after stacking a plurality of first electrodes, a plurality of solid electrolytes and a plurality of second electrodes, making the first electrode plates of each of the plurality of first electrodes closely connected and joined with a first lead, and making the second electrode plates of each of the plurality of second electrodes closely connected and joined with a second lead.

[0024] The method for manufacturing an all-solid-state battery based on an embodiment of the present invention further includes: packaging a plurality of stacked first electrodes, a plurality of solid electrolytes, and a plurality of second electrodes together with a post-encapsulation material.

[0025] In this technology, since the isostatic pressing process is performed with the electrode plates separated from the clamping plate, damage to the electrode plates can be prevented, thereby improving the productivity of all-solid-state batteries.

[0026] In addition, it can provide effects that are directly or indirectly reflected through this instruction manual. Attached Figure Description

[0027] Figure 1 This is a vertical cross-sectional view of an all-solid-state battery based on an embodiment of the present invention.

[0028] Figure 2 This is a flowchart of a method for manufacturing an all-solid-state battery based on an embodiment of the present invention.

[0029] Figure 3 This is a vertical cross-sectional view of the cell pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on an embodiment of the present invention.

[0030] Figure 4 This is a vertical cross-sectional view of the cell pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0031] Figure 5 This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0032] Figure 6 This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0033] Figure 7 This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0034] Figure 8 This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures

[0036] 100: All-solid-state battery

[0037] 100a, 100b, 100c, 100d, 100e, 100f: Unit-pressurized stacked bodies

[0038] 110: Post-packaging material

[0039] 120: First Lead

[0040] 130: Second lead

[0041] 200: First electrode

[0042] 210: First electrode current collector

[0043] 220: First electrode body

[0044] 230: First electrode plate

[0045] 240: Active material of the first electrode

[0046] 300: Second electrode

[0047] 310: Second electrode current collector

[0048] 320: Second electrode body

[0049] 330: Second electrode plate

[0050] 340: Second electrode active material

[0051] 400: Edge component

[0052] 500: Solid electrolyte

[0053] 600: Plywood

[0054] 610: Main body of the clamping plate

[0055] 620: Clamping plate cover

[0056] 700: Packaging material

[0057] 710: Internal packaging material

[0058] 800: Protective film

[0059] L1: Length of the clamping plate in the second direction

[0060] L2: Length of the first electrode body in the second direction

[0061] L3: Length of the second electrode body in the second direction

[0062] L4: Length of the protective film in the second direction

[0063] S10: Stacking Steps

[0064] S20: Intermediate Packaging Steps

[0065] S30: Pressurization Steps

[0066] S40: Post-stack step

[0067] S50: Connection Steps

[0068] S60: Post-packaging steps. Detailed Implementation

[0069] Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that when affixing reference numerals to components in the various drawings, the same reference numerals are used as much as possible for the same components, even if they are shown in different drawings. Furthermore, when describing embodiments of the present invention, detailed descriptions of related well-known structures or functions are omitted if it is determined that such detailed descriptions would hinder understanding of the embodiments of the present invention.

[0070] In describing the components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are used only to distinguish the component from other components, and the nature, order, or sequence of the corresponding components is not limited by these terms. Furthermore, unless otherwise defined, all terms used herein (including technical or scientific terms) have the same meaning as commonly understood by those skilled in the art. Terms identical to those defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the related art, and should not be interpreted as imaginary or overly formal unless explicitly defined herein.

[0071] The following is for reference Figures 1 to 8 The embodiments of the present invention will be described in detail below.

[0072] Figure 1 This is a vertical cross-sectional view of an all-solid-state battery based on an embodiment of the present invention.

[0073] Reference Figure 1 The all-solid-state battery 100 includes: a first electrode 200; a second electrode 300 stacked on the first electrode 200 and having a different polarity from the first electrode 200; and a post-encapsulation material 110 formed in a manner that encapsulates 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.

[0074] The all-solid-state battery 100 can be configured to have multiple first electrodes 200 and multiple second electrodes 300 alternately stacked in a first direction (the X direction or the direction opposite to the X direction). The first electrode 200 may include a first electrode current collector 210 and a first electrode active material 240 formed on the first electrode current collector 210. The first electrode active material 240 may be formed on two sides of the first electrode current collector 210 facing the first direction (the X direction or the direction opposite to the X direction), or it may be formed on only one side of the first electrode current collector 210.

[0075] The second electrode 300 may include a second electrode current collector 310 and a second electrode active material 340 formed on the second electrode current collector 310. The second electrode active material 340 may be formed on two sides of the second electrode current collector 310 facing the first direction (X direction or the direction opposite to X direction), whereas the second electrode active material 340 may be formed on only one side of the second electrode current collector 310.

[0076] The first electrode current collector 210 may be formed of nickel (Ni), but is not limited thereto. Additionally, the second electrode current collector 310 may be formed of aluminum (Al), but is not limited thereto.

[0077] The first electrode current collector 210 may include a first electrode body 220 and a first electrode plate 230 protruding from the first electrode body 220 toward one side of the second direction (Y direction). The second electrode current collector 310 may include a second electrode body 320 and a second electrode plate 330 protruding from the second electrode body 320 toward the other side of the second direction (opposite to the Y direction).

[0078] 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.

[0079] The portion of the first electrode plate 230 of each of the plurality of first electrodes 200 that is in close contact with the first electrode 200 or the second electrode 300 located at both ends of the plurality of first electrodes 200 and the plurality of second electrodes 300 along the first direction can be formed to be spaced apart from the first electrode 200 or the second electrode 300 located at both ends of the first direction along the first direction.

[0080] More specifically, the plurality of first electrode plates 230 can be closely connected to each other on one side (Y direction) of the plurality of first electrode bodies 220 and the plurality of second electrode bodies 320 in a second direction. The plurality of closely connected first electrode plates 230 can be connected to the first lead 120.

[0081] In addition, the portion of the second electrode plate 330 of each of the plurality of second electrodes 300 that is in close contact with each other can be formed to be spaced apart from the first electrodes 200 or the second electrodes 300 located at both ends of the first direction among the plurality of first electrodes 200 and the plurality of second electrodes 300 along the first direction.

[0082] More specifically, the plurality of second electrode plates 330 can be closely connected to each other on the other side of the second direction (opposite to the Y direction) of the plurality of first electrode bodies 220 and the plurality of second electrode bodies 320. The plurality of closely connected second electrode plates 330 can be connected to the second lead 130.

[0083] The post-encapsulation material 110 of the all-solid-state battery 100 can be formed in such a way that it encapsulates a portion of the stacked first electrode 200 and second electrode 300, as well as a portion of the first lead 120 and second lead 130.

[0084] On the other hand, the all-solid-state battery 100 may include a solid electrolyte 500 disposed between the first electrode 200 and the second electrode 300. Unlike lithium-ion batteries, the all-solid-state battery 100 does not have a separate separator between the first electrode 200 and the second electrode 300, but instead uses a solid electrolyte 500 in a solid state. The all-solid-state battery 100 may be manufactured by coating or transferring the solid electrolyte 500 onto the side of the first electrode 200 opposite to the second electrode 300.

[0085] Unlike lithium-ion batteries, the solid electrolyte 500 in the all-solid-state battery 100 consists 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, pressure needs to be applied in the stacking direction of the first electrode 200 and the second electrode 300. As an example, the all-solid-state battery requires a warm isostatic pressing (WIP) process to form a warm isostatic pressing (WIP) process.

[0086] Furthermore, when observing the first electrode 200 and the second electrode 300 at intervals along 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.

[0087] This is to prevent the following situation from occurring: as the all-solid-state battery 100 is repeatedly charged and discharged, a phenomenon known as dendrite formation will occur on the surface of the first electrode 200 and deposit thereon, which may cause a short circuit between the first electrode 200 and the second electrode 300.

[0088] To prevent the above situation, the area of ​​the first electrode active material 240 formed on the first electrode body 220 can be formed to be larger than the area of ​​the second electrode active material 340 formed on the second electrode body 320.

[0089] As described above, in order to prevent damage to the first electrode plate 230 and the second electrode plate 330 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 further include an edge member 400 disposed along the periphery of the second electrode active material 340 and in contact with the second electrode plate 330.

[0090] The edge member 400 may be formed to support the first electrode active material 240 located further outward in the second direction (Y direction or the direction opposite to the Y direction) and the third direction (two directions perpendicular to the X and Y directions) than the second electrode active material 340. The edge member 400 may be formed of polyethylene terephthalate (PET), but is not limited thereto.

[0091] Figure 2 This is a flowchart of a method for manufacturing an all-solid-state battery based on an embodiment of the present invention. Figure 3 This is a vertical cross-sectional view of the cell pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on an embodiment of the present invention.

[0092] Reference Figure 2 and Figure 3 100 all-solid-state battery (reference) Figure 1 The manufacturing method of the product may include a stacking step (S10), an intermediate packaging step (S20), a pressurizing step (S30), a post-stacking step (S40), a connecting step (S50), and a post-packaging step (S60).

[0093] The stacking step (S10) may be the following steps: stacking at least one first electrode 200, at least one second electrode 300 and at least one solid electrolyte 500 disposed between the first electrode 200 and the second electrode 300 in a first direction.

[0094] Additionally, the stacking step (S10) may include the following step: bringing the edge member 400 extending along the periphery of the second electrode active material 340 into contact with the second electrode electrode 330.

[0095] In the stacking step (S10), a pair of first electrodes 200 may be provided, and a single second electrode 300 may be provided, but not limited to this.

[0096] The intermediate packaging step (S20) may be as follows: after the stacking step (S10), at least one first electrode 200, at least one second electrode 300 and at least one solid electrolyte 500 are stacked on the clamping plate 600 and packaged with encapsulation material 700.

[0097] like Figure 3 As shown, the pressurization step (S30) can be the following step: after the intermediate packaging step (S20), pressurize at least one first electrode 200 and at least one second electrode 300 along a first direction (X direction or the direction opposite to X direction). The pressurization step (S30) can be the step of performing the above-described warm isostatic pressing process.

[0098] In other words, the pressurization step (S30) can be the following step: pressurizing at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 along a first direction. At this time, at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 can be in a state where they are supported on a clamp 600 and packaged together with the clamp 600.

[0099] The pressurization step (S30) may be as follows: in order to form the interface between the first electrode 200 and the solid electrolyte 500 and between the second electrode 300 and the solid electrolyte 500, pressurization is performed at a magnitude of 450 MPa in the first direction at an environment of 100 degrees Celsius.

[0100] like Figure 3 As shown, the unit pressurized stack 100a may include at least one first electrode 200, at least one second electrode 300, at least one solid electrolyte 500, and a clamping plate 600. In addition, the unit pressurized stack 100a may include an encapsulation material 700 that packages at least one electrode 200, at least one second electrode 300, and the clamping plate 600 together.

[0101] When at least one first electrode 200, at least one second electrode 300, and at least one solid electrolyte 500 are stacked on the clamping plate 600, the first electrode plate 230 and the second electrode plate 330 may be configured to be spaced apart from the clamping plate 600 along a first direction. More specifically, at least one first electrode plate 230 and at least one second electrode plate 330 may be configured to be spaced apart from both ends of the clamping plate 600 along the first direction in a second direction.

[0102] On the other hand, the two ends of the clamping plate 600 in the second direction are configured to be closer to the inside of the second direction than the two ends of the first electrode body 220 in the second direction, or the two ends of the clamping plate 600 in the second direction are configured at positions corresponding to the positions of the two ends of the first electrode body 220 in the second direction in the first direction.

[0103] That is, the length L2 of the first electrode body 220 in the second direction is formed to be equal to or have a difference of about 1 mm from the length L1 of the clamping plate 600 in the second direction. In addition, the first electrode body 220 and the clamping plate 600 can be configured so that they do not protrude from each other in the second direction.

[0104] According to this structure, when performing isostatic pressing in the first direction during the pressurization step (S30), the clamping plate 600 can pressurize the first electrode body 220 and the second electrode body 320 without pressurizing at least one first electrode plate 230 and at least one second electrode plate 330.

[0105] In the pressurization step (S30), at least one first electrode plate 230 and at least one second electrode plate 330 do not contact the clamping plate 600, thereby preventing damage to the first electrode plate 230 and the second electrode plate 330, and improving the performance of the all-solid-state battery 100 (see reference). Figure 1 Productivity.

[0106] The post-stacking step (S40) may be as follows: after the pressurization step (S30), remove the packaging of the encapsulation material 700, and as... Figure 1 As shown, multiple first electrodes 200 and multiple second electrodes 300 are further stacked.

[0107] The post-stacking step (S40) may include placing a solid electrolyte 500 between the first electrode 200 and the second electrode 300.

[0108] In other words, the post-stacking step (S40) can be the following steps: after pressurizing at least one first electrode 200, at least one solid electrolyte 500 and at least one second electrode 300 after packaging, remove the packaging of the encapsulation material 700 and further stack multiple first electrodes 200, multiple solid electrolytes 500 and multiple second electrodes 300.

[0109] The connection step (S50) may be as follows: after the post-stacking step (S40), the first electrode plates 230 of the plurality of first electrodes 200 are connected to each other and joined to the first lead 120, and the second electrode plates 330 of the plurality of second electrodes 300 are connected to each other and joined to the second lead 130.

[0110] In other words, the connection step (S50) can be the following steps: after the plurality of first electrodes 200, the plurality of solid electrolytes 500 and the plurality of second electrodes 300 are stacked, the first electrode plates 230 of each of the plurality of first electrodes 200 are made to be closely connected to each other and joined to the first lead 120, and the second electrode plates 330 of each of the plurality of second electrodes 300 are made to be closely connected to each other and joined to the second lead 130.

[0111] The post-packaging step (S60) can be as follows: after the connection step (S50), the stacked plurality of first electrodes 200 and the plurality of second electrodes 300 are wrapped together with post-encapsulation material 110.

[0112] In other words, the post-packaging step (S60) can be the following steps: packaging the stacked first electrodes 200, the multiple solid electrolytes 500 and the multiple second electrodes 300 together with the post-packaging material 110.

[0113] Figure 4This is a vertical cross-sectional view of the cell pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0114] Reference Figure 4 ,and Figure 3 Compared to the unit pressurized stack 100a shown, the length L1 of the clamping plate 600 in the second direction and the configuration of the clamping plate 600 in the unit pressurized stack 100b are different.

[0115] The clamp 600 can be disposed on the central region of the first electrode 200 in the second direction. Figure 4 The composition and structure not mentioned in the text can be referenced. Figure 3 The structure.

[0116] More specifically, the length L1 of the clamping plate 600 in the second direction can be formed to be shorter than the length L2 of the first electrode body 220 in the second direction, but longer than the length L3 of the second electrode body 320 in the second direction.

[0117] The two ends of the clamp 600 in the second direction can be disposed between the two ends of the first electrode body 220 in the second direction and the two ends of the second electrode body 320 in the second direction.

[0118] With this structure, during the pressurization step (S30), when the clamping plate 600 pressurizes the first electrode body 220 and the second electrode body 320, it does not pressurize at least one first electrode plate 230 and at least one second electrode plate 330. This prevents at least one first electrode plate 230 and at least one second electrode plate 330 from contacting the clamping plate 600, thereby preventing damage to the first electrode plate 230 and the second electrode plate 330, and improving the performance of the all-solid-state battery 100 (see reference). Figure 1 Productivity.

[0119] Figure 5 This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0120] Reference Figure 5 ,and Figure 3 Compared to the unit pressurized stack 100a shown, the unit pressurized stack 100c may also include a protective membrane 800.

[0121] That is, all-solid-state battery 100 (refer to) Figure 1 Intermediate packaging step (S20) (refer to) Figure 2 It may also include: a protective film 800 disposed between the first electrode 200 or the second electrode 300 located at one end in a first direction and the clamping plate 600.

[0122] In other words, according to Figure 5 The structure shown, the process of packaging at least one first electrode 200, at least one solid electrolyte 500, and at least one second electrode 300 with encapsulation material 700 may include: placing a protective film 800 between the first electrode 200 or the second electrode 300 located at one end in a first direction and the clamping plate 600, and packaging the protective film 800 together with the encapsulation material 700.

[0123] Figure 5 The composition and structure not mentioned in the text can be referenced. Figure 3 The structure.

[0124] The protective film 800 can be stacked on the clamping plate 600, and at least one first electrode 200 and at least one second electrode 300 can be stacked on the protective film 800. The protective film 800 can be formed of a polymer material and can be a structure for preventing at least one first electrode 200 and at least one second electrode 300 from being subjected to strong pressure by the clamping plate 600.

[0125] The protective film 800 may be formed of polyimide, but is not limited thereto, as long as it is a structure capable of buffering the pressure transmitted from the clamp 600 to the at least one first electrode 200 and the at least one second electrode 300 between the clamp 600 and the at least one first electrode 200 and the at least one second electrode 300.

[0126] The two ends of the protective film 800 in the second direction can be configured to be further outward in the second direction than the two ends of the clamp 600 in the second direction, or they can be configured at positions corresponding to the positions of the two ends of the clamp 600 in the second direction in the first direction.

[0127] That is, the length L4 of the protective film 800 in the second direction can be made longer than the length L1 of the clamping plate 600 in the second direction. At this time, the length L1 of the clamping plate 600 in the second direction can be made equal to the length L2 of the first electrode body 220 in the second direction (refer to...). Figure 3 )equal.

[0128] With this structure, during the pressurization step (S30), when the clamping plate 600 presses the first electrode body 220 and the second electrode body 320 via the protective film 800, it does not pressurize at least one first electrode plate 230 and at least one second electrode plate 330, thereby preventing damage to at least one first electrode plate 230 and at least one second electrode plate 330 due to the clamping plate 600. This improves the productivity of the all-solid-state battery 100.

[0129] Figure 6This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0130] Reference Figure 6 The unit pressurized stack 100d may include an internal encapsulation material 710 that encapsulates at least one first electrode 200 and at least one second electrode 300. The internal encapsulation material 710 may be configured to encapsulate at least one first electrode 200 and at least one second electrode 300 before they are stacked on the clamping plate 600.

[0131] Figure 6 The composition and structure not mentioned in the text can be referenced. Figure 3 The structure.

[0132] At least one first electrode 200 and at least one second electrode 300 can be stacked on a clamping plate 600 after being wrapped in an inner encapsulation material 710. Then, at least one first electrode 200 and at least one second electrode 300, the inner encapsulation material 710 and the clamping plate 600 can be wrapped in the encapsulation material 700.

[0133] At this time, the length L1 of the clamping plate 600 in the second direction and the length L2 of the first electrode body 220 in the second direction can be made equal, or have a difference of about 1 mm. In addition, the two ends of the clamping plate 600 in the second direction can be positioned at positions corresponding to the positions of the two ends of the first electrode 200 in the second direction in the first direction.

[0134] In other words, based on Figure 6 The intermediate packaging step (S20) of the unit pressurized stack 100d may include: after wrapping at least one first electrode 200, at least one solid electrolyte 500 and at least one second electrode 300 with the inner encapsulation material 710, packaging with the encapsulation material 700 in such a way that the inner encapsulation material 710 and the clamp 600 are wrapped together.

[0135] In other words, the process of packaging at least one first electrode 200, at least one solid electrolyte 500 and at least one second electrode 300 with encapsulation material 700 includes: wrapping at least one first electrode 200, at least one solid electrolyte 500 and at least one second electrode 300 with inner encapsulation material 710, and then packaging with encapsulation material 700 in such a way that the inner encapsulation material 710 and the clamp 600 are wrapped together.

[0136] With this structure, during the pressurization step (S30), when the clamping plate 600 pressurizes the first electrode body 220 and the second electrode body 320, it does not pressurize at least one first electrode plate 230 and at least one second electrode plate 330. This prevents damage to at least one first electrode plate 230 and at least one second electrode plate 330, thereby improving the performance of the all-solid-state battery 100 (see reference). Figure 1 Productivity.

[0137] Figure 7 This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0138] Reference Figure 7 The clamping plate 600 of the unit pressurized stack 100e may include a clamping plate body 610 and a clamping plate cover 620. Figure 7 The composition and structure not mentioned in the text can be referenced. Figure 3 The structure.

[0139] The length L1 of the clamping plate 600 in the second direction and the length L2 of the first electrode body 220 in the second direction can be made equal or have a difference of about 3 mm.

[0140] The clamp cover 620 can be disposed on both sides of the clamp body 610 in a second direction. The clamp cover 620 can be made of an elastic member. The clamp cover 620 can be configured to prevent at least one first electrode plate 230 and at least one second electrode plate 330 from contacting and being damaged by the clamp body 610.

[0141] In other words, the clamp cover 620 is made of a material that is more elastic than the clamp body 610, so that when the unit pressurized stack 100e is subjected to a warm isostatic pressing process in the pressurization step (S30), damage can be prevented even if at least one first electrode plate 230 and at least one second electrode plate 330 come into contact with the clamp cover 620.

[0142] In addition, at least one first electrode body 220 and at least one second electrode body 320 are pressed by the clamping plate body 610 along the first direction, thereby maximizing the formation of the interface between the first electrode 200 and the solid electrolyte 500 and the interface between the second electrode 300 and the solid electrolyte 500.

[0143] At this time, during the pressurization step (S30), when the clamping plate 600 pressurizes the first electrode body 220 and the second electrode body 320, it does not pressurize at least one first electrode plate 230 and at least one second electrode plate 330. This prevents at least one first electrode plate 230 and at least one second electrode plate 330 from being damaged by the clamping plate 600, thereby improving the productivity of the all-solid-state battery 100.

[0144] Figure 8 This is a vertical cross-sectional view of the unit pressurized stack in the pressurization step of a method for manufacturing an all-solid-state battery based on another embodiment of the present invention.

[0145] Reference Figure 8 The clamping plate 600 of the unit pressurized stack 100f may include a clamping plate body 610 and a clamping plate cover 620. Figure 8 The composition and structure not mentioned in the text can be referenced. Figure 3 The structure.

[0146] The length L1 of the clamping plate 600 in the second direction can be made shorter than the length L2 of the first electrode body 220 in the second direction, but longer than the length L3 of the second electrode body 320 in the second direction.

[0147] The two ends of the clamping plate 600 in the second direction can be configured to be further inward than the two ends of the first electrode body 220 in the second direction, or configured at positions corresponding to the positions of the two ends of the first electrode body 220 in the second direction in the first direction.

[0148] More specifically, the two ends of the clamp cover 620 in the second direction can be disposed between the two ends of the first electrode body 220 in the second direction and the two ends of the second electrode body 320 in the second direction.

[0149] The two ends of the clamping plate 600 in the second direction can be configured to be further inside the second direction than the two ends of the first electrode body 220 in the second direction, and further outside the second direction than the two ends of the second electrode body 320 in the second direction.

[0150] At this time, during the pressurization step (S30), while the clamping plate 600 pressurizes the first electrode body 220 and the second electrode body 320, it does not pressurize at least one first electrode plate 230 and at least one second electrode plate 330. This prevents at least one first electrode plate 230 and at least one second electrode plate 330 from being damaged by the clamping plate 600. Consequently, the productivity of the all-solid-state battery 100 can be improved.

[0151] The following is a summary of the above information with reference to Table 1. Figures 3 to 8The damage rates of the first electrode plate 230 and the second electrode plate 330 that may occur during the warm isostatic pressing process of the unit pressurized stacks 100a, 100b, 100c, 100d, 100e, 100f and the comparative examples are explained.

[0152]

[0153] <Table 1. Defect rates of the first and second electrode sheets that may occur in the warm isostatic pressing process of the unit pressurized stack and comparative examples based on various embodiments of the present invention>

[0154] Referring to Table 1, the damage rates of the first electrode plate 230 and the second electrode plate 330 that may occur when the unit pressure stacks 100a, 100b, 100c, 100d, 100e, 100f and the comparative examples of the present invention are subjected to a 30-minute warm isostatic pressing process at 100 degrees Celsius can be confirmed.

[0155] In the comparative example, the two ends of the clamp in the second direction can be configured to be further outward in the second direction than the two ends of the first electrode body in the second direction. It was confirmed that the damage rate of the first electrode sheet after the warm isostatic pressing process in the comparative example was 50%, and the damage rate of the second electrode sheet was 92%.

[0156] In contrast, it can be confirmed that Figure 3 The damage rate of the first electrode 230 of the unit pressurized stack 100a after the warm isostatic pressing process is 4%, and the damage rate of the second electrode 330 is 12%.

[0157] It can be confirmed Figure 4 The damage rate of the first electrode 230 and the damage rate of the second electrode 330 after the warm isostatic pressing process of the unit pressurized stack 100b shown is 4%.

[0158] It can be confirmed Figure 5 The damage rate of the first electrode 230 and the damage rate of the second electrode 330 after the warm isostatic pressing process of the unit pressurized stack 100c shown is 2%.

[0159] It can be confirmed Figure 6 The damage rate of the first electrode 230 and the second electrode 330 of the unit pressurized stack 100d after the warm isostatic pressing process is 3%.

[0160] It can be confirmed Figure 7 The damage rate of the first electrode 230 and the damage rate of the second electrode 330 after the warm isostatic pressing process of the unit pressurized stack 100e shown is 2%.

[0161] It can be confirmed Figure 8 The damage rate of the first electrode 230 after the warm isostatic pressing process of the unit pressurized stack 100f shown is 4%, and the damage rate of the second electrode 330 is 6%.

[0162] Therefore, it can be confirmed that, compared to the comparative example, the damage rate of the first electrode plate 230 and the second electrode plate 330 that may occur during the warm isostatic pressing process of the unit pressurized stacks 100a, 100b, 100c, 100d, 100e, and 100f is significantly reduced. Therefore, the all-solid-state battery 100 based on the present invention (see reference) Figure 1 The manufacturing method of ) can improve the productivity of all-solid-state batteries 100.

[0163] The aforementioned unit pressurized stacks 100a, 100b, 100c, 100d, 100e, and 100f are not limited to... Figures 3 to 8 As an example, the structure shown can be configured such that the first electrode plate 230 and the second electrode plate 330 of the unit pressurized stack 100a, 100b, 100c, 100d, 100e, 100f can be formed to extend in a first direction and be in close contact with the two sides of at least one first electrode 200 and at least one second electrode 300 in a second direction, respectively.

[0164] The above description is only used to illustrate the technical concept of the present invention. Those skilled in the art can make various modifications and variations without departing from the essential characteristics of the present invention.

[0165] Therefore, the embodiments disclosed in this invention are not intended to limit the technical concept of the invention but rather to illustrate it. The scope of the technical concept of the invention is not limited to these embodiments. The scope of protection of this invention should be interpreted through the claims, and should be interpreted as including all technical concepts within the same scope as those claims.

Claims

1. An all-solid-state battery, comprising: A plurality of first electrodes, each first electrode including a first electrode current collector and a first electrode active material formed on the first electrode current collector, the first electrode current collector including a first electrode body and a first electrode plate; Multiple second electrodes having a different polarity from the first electrode are stacked alternately with the first electrode along a first direction. Each second electrode includes a second electrode current collector and a second electrode active material formed on the second electrode current collector. The second electrode current collector includes a second electrode body and a second electrode plate. as well as A solid electrolyte is disposed between the first electrode and the second electrode. The first electrode plate and the second electrode plate protrude from the first electrode body and the second electrode body, respectively, in a second direction intersecting the first direction. The portion of the first electrode plates of each of the plurality of first electrodes that are in close contact, or the portion of the second electrode plates of each of the plurality of second electrodes that are in close contact, is formed to be spaced apart from the first electrode or the second electrode located at both ends of the plurality of first electrodes and the plurality of second electrodes along the first direction.

2. The all-solid-state battery according to claim 1, wherein, The first electrode plates of each of the plurality of first electrodes are closely connected to each other on one side of the first electrode body and the second electrode body in a second direction. The second electrode plates 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 a second direction.

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

4. The all-solid-state battery according to claim 2, further comprising: An edge component is disposed along the periphery of the second electrode active material and contacts the second electrode plate.

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

6. A method for manufacturing an all-solid-state battery, comprising: At least one first electrode, at least one second electrode having a polarity different from that of the first electrode, and at least one solid electrolyte disposed between the first electrode and the second electrode are stacked 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 onto a clamping plate and packaged with encapsulation material. as well as The packaged at least one first electrode, at least one solid electrolyte, and at least one second electrode are pressurized along a first direction; The first electrode includes a first electrode current collector, which has a first electrode body and a first electrode plate protruding from the first electrode body in a second direction intersecting the first direction. The second electrode includes a second electrode current collector, which has a second electrode body and a second electrode plate protruding from the second electrode body in a second direction. When the at least one first electrode, the at least one second electrode, and the at least one solid electrolyte are stacked on the clamping plate, the first electrode plates and the second electrode plates are configured to be spaced apart from the clamping plate along the first direction.

7. The method for manufacturing an all-solid-state battery according to claim 6, wherein, The two ends of the clamp in the second direction are configured to be further inside the second direction than the two ends of the first electrode body in the second direction, or... The two ends of the clamp in the second direction are positioned at positions corresponding to the positions of the two ends of the first electrode body in the second direction in the first direction.

8. The method for manufacturing an all-solid-state battery according to claim 6, wherein, The two ends of the clamp in the second direction are disposed 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.

9. The method for manufacturing an all-solid-state battery according to claim 6, wherein, The process of packaging the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the encapsulation material includes: A protective film is further disposed between the first electrode or the second electrode located at one end in the first direction of the at least one first electrode and the at least one second electrode and the clamping plate, and the protective film is packaged together with the encapsulation material.

10. The method for manufacturing an all-solid-state battery according to claim 9, The two ends of the protective film in the second direction are configured to be further outward in the second direction than the two ends of the clamp in the second direction, or... The two ends of the protective film in the second direction are positioned at positions corresponding to the two ends of the clamp in the second direction in the first direction.

11. The method for manufacturing an all-solid-state battery according to claim 6, wherein, The process of packaging the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode with the encapsulation material includes: After the at least one first electrode, the at least one solid electrolyte, and the at least one second electrode are wrapped with an internal encapsulation material, the encapsulation material is used to package the internal encapsulation material and the clamp together.

12. The method for manufacturing an all-solid-state battery according to claim 6, wherein, The clamping plate includes: The main body of the plywood; and Clamp covers are disposed on both sides of the clamp body in a second direction; The clamp cover is an elastic component.

13. The method for manufacturing an all-solid-state battery according to claim 12, wherein, The two ends of the clamp in the second direction are configured to be further inside the second direction than the two ends of the first electrode body in the second direction, or... The two ends of the clamp in the second direction are positioned at positions corresponding to the two ends of the first electrode body in the second direction in the first direction.

14. The method for manufacturing an all-solid-state battery according to claim 12, wherein, The two ends of the clamp cover in the second direction are disposed 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.

15. The method for manufacturing an all-solid-state battery according to claim 6, further comprising: After pressurizing the packaged at least one first electrode, at least one solid electrolyte, and at least one second electrode, the packaging of the encapsulation material is removed, and multiple first electrodes, multiple solid electrolytes, and multiple second electrodes are further stacked.

16. The method for manufacturing an all-solid-state battery according to claim 15, further comprising: After stacking multiple first electrodes, multiple solid electrolytes, and multiple second electrodes, the first electrode plates of each of the multiple first electrodes are brought into close contact and connected to a first lead, and the second electrode plates of each of the multiple second electrodes are brought into close contact and connected to a second lead.

17. The method for manufacturing an all-solid-state battery according to claim 16, further comprising: The stacked first electrodes, multiple solid electrolytes, and multiple second electrodes are packaged together with post-encapsulation material.

Images