All-solid-state battery

Abstract

An all-solid-state battery includes: a plurality of first electrodes, each first electrode including a first electrode current collector, which includes a first electrode body and a first tab protruding from the first electrode body; a plurality of second electrodes configured to have a polarity different from that of the first electrodes and stacked alternately with the first electrodes along a first direction, wherein each second electrode includes a second electrode current collector, which includes a second electrode body and a second tab protruding from the second electrode body; a solid electrolyte disposed between the first electrodes and the second electrodes; and leads connected to the plurality of first tabs or the plurality of second tabs. The plurality of first tabs and the plurality of second tabs are spaced apart from each other in the first direction, and the leads include portions that are engaged with the plurality of first tabs or the plurality of second tabs and extend along the first direction.

Description

Technical Field

[0001] This disclosure relates to all-solid-state batteries. Background Technology

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

[0003] Because conventional secondary batteries use liquids as electrolytes, their stability is poor. For example, expansion due to temperature changes or leakage due to external impacts can lead to explosions and fires. To address this issue, research and development of all-solid-state batteries are actively underway.

[0004] All-solid-state batteries possess high structural stability due to the electrolyte, located between the positive and negative electrode coatings, being formed from solid materials, and may eliminate the need for a separator. This enables battery miniaturization and further increases in energy density. However, in all-solid-state batteries, the electrode coatings repeatedly expand and contract during charge and discharge, presenting limitations. For example, the interface between the electrode coating and the solid electrolyte can peel off, leading to performance degradation.

[0005] Therefore, a warm isostatic pressing process can be performed on all-solid-state batteries to prevent the delamination of the interface between the electrode coating and the solid electrolyte. In this case, the necessity of a structure to prevent the tabs of the electrode current collector from being damaged during warm isostatic pressing increases. Summary of the Invention

[0006] This disclosure aims to solve the aforementioned problems in the related art while maintaining the advantages achieved by the related art.

[0007] One aspect of this disclosure provides an all-solid-state battery that is able to prevent damage to the tabs during a temperature isostatic pressing process.

[0008] The technical problems to be solved by this disclosure are not limited to those mentioned above. Those skilled in the art to which this disclosure pertains will clearly understand any other technical problems not mentioned herein through the following description.

[0009] According to one aspect of this disclosure, an all-solid-state battery may include: a plurality of first electrodes, each first electrode including a first electrode current collector, the first electrode current collector including a first electrode body and a first tab protruding from the first electrode body; a plurality of second electrodes configured to have a polarity different from that of the first electrodes and stacked alternately with the first electrodes along a first direction, wherein each second electrode includes a second electrode current collector, the second electrode current collector including a second electrode body and a second tab protruding from the second electrode body; a solid electrolyte disposed between the first electrodes and the second electrodes; and leads connected to the plurality of first tabs or the plurality of second tabs, the plurality of first tabs and the plurality of second tabs being spaced apart from each other in the first direction, the leads including portions joined to the plurality of first tabs or the plurality of second tabs and extending along the first direction.

[0010] Multiple first tabs can extend from one side of the first electrode body along the first direction, which intersects with the first direction, and multiple second tabs can extend from the other side of the second direction of the second electrode body along the first direction.

[0011] The end of the first electrode tab may be spaced apart from the second electrode adjacent to the first electrode tab in the first direction in the first direction, and the end of the second electrode tab may be spaced apart from the first electrode adjacent to the second electrode tab in the first direction in the first direction.

[0012] Multiple first tabs can extend from the first electrode body in the same direction, and multiple second tabs can extend from the second electrode body in the same direction.

[0013] The width of the first electrode tab in the third direction intersecting the first and second directions can correspond to the width of the first electrode body in the third direction, and the width of the second electrode tab in the third direction can correspond to the width of the second electrode body in the third direction.

[0014] The lead may include: a bonding region, including a segment extending in a first direction to bond to a plurality of first tabs or a plurality of second tabs; and a protruding region extending from the bonding region.

[0015] The protruding area can extend from one end of the joint area along a second direction intersecting the first direction.

[0016] All-solid-state batteries may also include a casing covering multiple first electrodes and multiple second electrodes, and protruding areas of leads may extend through the casing.

[0017] The all-solid-state battery may also include edge members that extend along the outer periphery of the second electrode body and are in contact with the second electrode body.

[0018] The edge member may include an edge hole through which the second electrode ear passes.

[0019] The second electrode can protrude to the other side of the second direction, which intersects the first direction, while in contact with one surface of the edge member facing the first direction.

[0020] Edge members can be formed from polymer films.

[0021] Each first electrode can be a negative electrode, and each second electrode can be a positive electrode.

[0022] According to one aspect of this disclosure, a method for manufacturing an all-solid-state battery may include: alternately stacking at least one first electrode and at least one second electrode, and stacking at least one solid electrolyte between the at least one first electrode and the at least one second electrode as a cell stack, wherein the at least one first electrode includes a first electrode body and a first tab, the width of the first tab corresponding to the width of the first electrode body in a direction intersecting the length direction of the first electrode body, and the at least one second electrode includes a second electrode body and a second tab, the width of the second tab corresponding to the width of the second electrode body in a direction intersecting the length direction of the second electrode body; surrounding the stacked cell stack with a cover; stacking the cell stack surrounded by the cover on a jig plate; and pressurizing the cell stack.

[0023] The method may further include: attaching a first tab of each of at least one stacked first electrode to one side of the cell stack; attaching a second tab of each of at least one stacked second electrode to the other side of the cell stack; connecting a first lead to the attached first tab of at least one first electrode; and connecting a second lead to the attached second tab of at least one second electrode. Attached Figure Description

[0024] The above and other objects, features and advantages of this disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings:

[0025] Figure 1 This is a vertical cross-sectional view of an all-solid-state battery according to an exemplary embodiment of the present disclosure;

[0026] Figure 2 This is a plan view of the second electrode according to an exemplary embodiment of the present disclosure;

[0027] Figure 3 This is an enlarged perspective view of the second tab and second lead portion of an all-solid-state battery according to an exemplary embodiment of the present disclosure;

[0028] Figure 4 This is a perspective view of the second lead according to an exemplary embodiment of the present disclosure; and

[0029] Figure 5This is a flowchart of a method for manufacturing an all-solid-state battery according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0030] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When adding reference numerals to components in the drawings, it should be noted that the same reference numerals should be used as much as possible, even if the same component is shown in different drawings. Furthermore, in describing exemplary embodiments of the present disclosure, detailed descriptions related to well-known functions or configurations will be omitted if they may unnecessarily obscure the subject matter of the disclosure.

[0031] In describing the components of embodiments of this disclosure, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used herein. These terms are used only to distinguish one element from another and do not constitute a limitation on the respective elements, regardless of their nature, order, or priority. Furthermore, unless otherwise defined, all terms used herein, including technical and scientific terms, should be interpreted in accordance with the conventional understanding in the art to which this disclosure pertains. Terms defined in common dictionaries should be interpreted as having a meaning consistent with the context of the relevant technical field and should not be construed as having an ideal or overly formal meaning unless explicitly defined herein.

[0032] The following will refer to Figures 1 to 5 Various embodiments of this disclosure are described in detail.

[0033] Figure 1 This is a vertical cross-sectional view of an all-solid-state battery according to an exemplary embodiment of the present disclosure.

[0034] Reference Figure 1 The all-solid-state battery 100 may include a first electrode 200, a second electrode 300, and a solid electrolyte 400 disposed between the first electrode 200 and the second electrode 300. At least one first electrode 200, at least one second electrode 300, and at least one solid electrolyte 400 may be defined as a cell stack 110.

[0035] The second electrode 300 may be stacked along a first direction ("Z" direction or the opposite direction to the "Z" direction) of the first electrode 200, and may be configured to have a different polarity than the first electrode 200. The first electrode 200 may be configured as a negative electrode, and the second electrode 300 may be configured as a positive electrode.

[0036] Multiple first electrodes 200 and multiple second electrodes 300 can be provided, and they can be alternately arranged along a first direction. In addition, multiple solid electrolytes 400 can be configured to be stacked between the first electrodes 200 and the second electrodes 300, respectively. Figure 1The illustration shows four first electrodes 200, three second electrodes 300, and six solid electrolytes 400, but this disclosure is not limited thereto.

[0037] The first electrode 200 may include: an electrode current collector, which includes a first electrode body 210 and a first tab 220; and a first electrode coating, which is coated on the first electrode current collector.

[0038] The second electrode 300 may include: a second electrode current collector, which includes a second electrode body 310 and a second tab 320; and a second electrode coating, which is coated on the second electrode current collector.

[0039] The first electrode coating may be disposed on one surface of the first electrode current collector facing the second electrode 300, or on two opposing surfaces of the first electrode current collector in the first direction. The second electrode coating may be disposed on one surface of the second electrode current collector facing the first electrode 200, or on two opposing surfaces of the second electrode current collector in the first direction.

[0040] The first electrode current collector may be formed of nickel (Ni) or may include nickel, but this disclosure is not limited thereto. Furthermore, the second electrode current collector may be formed of aluminum (Al) or may include aluminum, but this disclosure is not limited thereto.

[0041] The first electrode tab 220 may protrude from the first electrode body 210 to one side in the second direction ("X" direction). The first electrode body 210 of the first electrode current collector may be a portion coated with a first electrode coating.

[0042] The second electrode tab 320 may protrude from the second electrode body 310 to the other side of the second direction (opposite to the "X" axis direction). The second electrode body 310 of the second electrode current collector may be a portion coated with a second electrode coating.

[0043] On the other hand, unlike lithium-ion batteries, the all-solid-state battery 100 can include a solid electrolyte 400 without a separate separator between the first electrode 200 and the second electrode 300. The all-solid-state battery 100 can be manufactured by coating or transferring the solid electrolyte 400 onto one surface of the second electrode 300 facing the first electrode 200, or onto two surfaces of the second electrode 300 opposite each other in a first direction.

[0044] Unlike lithium-ion batteries, the solid electrolyte 400 of the all-solid-state battery 100 consists of solid particles. Therefore, an interface needs to be formed between the solid electrolyte 400 and the first electrode 200 or between the solid electrolyte 400 and the second electrode 300. For this purpose, the all-solid-state battery 100 may require a warm isostatic pressing (WIP) process.

[0045] When a thermostatic pressure is applied to the all-solid-state battery 100, the all-solid-state battery 100 can be mounted on the fixture plate 10. When a thermostatic pressure is applied to the all-solid-state battery 100, the fixture plate 10 can be configured to support the all-solid-state battery 100.

[0046] Furthermore, when the first electrode coating is observed with the first electrode coating spaced apart along a first direction, the area of ​​the first electrode coating disposed on the first electrode current collector can be larger than the area of ​​the second electrode coating disposed on the second electrode current collector. This is to prevent dendrite formation, which could cause a short circuit between the first electrode 200 and the second electrode 300. Dendrite formation is a phenomenon in which lithium crystals form on the surface of the second electrode 300 and accumulate in the form of crystal nuclei during repeated charging and discharging of the all-solid-state battery 100.

[0047] To prevent this, the area of ​​the second electrode coating on the second electrode current collector can be smaller than the area of ​​the first electrode coating on the first electrode current collector. In other words, the area of ​​the second electrode body 310 of the second electrode current collector can be smaller than the area of ​​the first electrode body 210 of the first electrode current collector.

[0048] To compensate for the area difference between the first electrode coating and the second electrode coating, the all-solid-state battery 100 may include an edge member 600 extending along the outer periphery of the second electrode 300.

[0049] One surface of the edge member 600 may be configured as an adhesive surface to adhere to the second electrode current collector and the second electrode coating on the outside of the second electrode 300. The edge member 600 may extend along the outer periphery of the second electrode body 310 and contact the second electrode body 310.

[0050] The edge member 600 may be formed of a polymer film. As an example, the edge member 600 may be formed of polyethylene terephthalate (PET), but this disclosure is not limited thereto.

[0051] The edge member 600 may include an edge hole through which the second tab 320 passes. The edge hole may be located on the opposite side of the edge member 600 along the second direction (in the direction opposite to the "X" direction). The edge hole may be configured to correspond to the size of the second tab 320, and a portion of the second tab 320 may be accommodated in the edge hole.

[0052] In contrast, the edge member 600 may not include an edge hole, and the second tab 320 may protrude to the other side of the second direction (opposite to the "X" direction) while contacting one surface of the edge member 600 facing the first direction.

[0053] The all-solid-state battery 100 may include leads 500 connected to a plurality of first tabs 220 or a plurality of second tabs 320. The leads 500 may include: a first lead 510 which is engaged to the plurality of first tabs 220 and includes a portion extending in a first direction; and a second lead 520 which is engaged to the plurality of second tabs 320 and includes a portion extending in the first direction.

[0054] The first lead 510 can be disposed on one side of the second direction of the first electrode 200 ("X" direction), and the second lead 520 can be disposed on the other side of the second direction of the second electrode 300 (opposite to the "X" direction).

[0055] The all-solid-state battery 100 may include a cover 700 configured to enclose a plurality of first electrodes 200, a plurality of second electrodes 300, a solid electrolyte 400, and an edge member 600. A portion through which the first lead 510 and the second lead 520 pass may be disposed within the cover 700.

[0056] In addition, the cover 700 may be a structure for surrounding a plurality of first electrodes 200, a plurality of second electrodes 300, a solid electrolyte 400 and an edge member 600 together before thermostatic pressing.

[0057] In the all-solid-state battery 100, the cover 700 can be replaced by an outer shell after temperature isostatic pressing. After temperature isostatic pressing, the first lead 510 and the second lead 520 can also pass through the outer shell surrounding the plurality of first electrodes 200, the plurality of second electrodes 300, the solid electrolyte 400, and the edge member 600.

[0058] Figure 2 This is a plan view of the second electrode according to an exemplary embodiment of the present disclosure. Figure 3 This is an enlarged perspective view of the second tab and second lead portion of an all-solid-state battery according to an exemplary embodiment of the present disclosure. Figure 4 This is a perspective view of the second lead according to an exemplary embodiment of the present disclosure.

[0059] Reference Figures 2 to 4 The second electrode tab 320 of the second electrode 300 can extend parallel to the second electrode body 310 before being stacked on the first electrode 200.

[0060] As described above, the second electrode body 310 may be a portion coated with the second electrode coating, while the second electrode tab 320 may be a portion not coated with the second electrode coating.

[0061] In this case, according to an exemplary embodiment of the present disclosure, the second tab 320 protrudes from the second electrode body 310 to the other side of the second direction (opposite to the "X" direction), therefore, when a thermostatic pressure is applied to the all-solid-state battery 100 (see... Figure 1 The second electrode 320 may be subjected to pressure applied by the edge member 600.

[0062] In this case, in order to prevent the second electrode tab 320 from being damaged by the edge member 600, the width of the second electrode tab 320 in the third direction ("Y" direction or the direction opposite to "Y" direction) can correspond to the width of the second electrode body 310 in the third direction, and the length "L" of the second electrode tab 320 in the second direction can be less than the length of the second electrode body 310 in the second direction.

[0063] The width "W" of the second electrode tab 320 in the third direction ("Y" direction or the direction opposite to "Y") can be formed to correspond to the width of the second electrode body 310 in the third direction. Thus, the width W of the second electrode tab 320 in the third direction ("Y" direction or the direction opposite to "Y") can correspond to or be smaller than the width of the second electrode body 310 in the third direction.

[0064] As an example, the length "L" of the second electrode tab 320 in the second direction can be approximately 2.0 mm or less. In this case, the length "L" of the second electrode tab 320 in the second direction can be its length before bending from the second electrode body 310 along the first direction.

[0065] The second electrode tab 320 according to an exemplary embodiment of the present disclosure can be manufactured in a state extending parallel to the second electrode body 310, and can be bent along the first direction on the other side of the second direction of the second electrode body 310 (the direction opposite to the "X" direction) after the second electrode 300 and the first electrode 200 are stacked together.

[0066] Therefore, the second tab 320 can extend from the other side of the second direction of the second electrode body 310 (the direction opposite to the "X" direction) along the first direction. In addition, the first tab 220 can extend from one side of the second direction of the first electrode body 210 (the "X" direction) along the first direction.

[0067] During the manufacturing process of the all-solid-state battery 100, multiple second tabs 320 can be bent from the second electrode body 310 along the first direction through a pressurizing process of a pressurizing plate, wherein the pressurizing plate is from the all-solid-state battery 100 (see... Figure 1 Move to one side of the second direction (the opposite direction to the "X" direction) from the other side of the second direction (the "X" direction).

[0068] When the multiple second electrodes 320 are bent along the first direction, the multiple second electrodes 320 can be spaced apart from each other in the first direction.

[0069] Figure 1 and Figure 3 The diagram shows multiple second tabs 320 bending from the second electrode body surrounded by the edge member 600 toward the other side of the first direction (opposite to the "Z" direction), but this disclosure is not limited thereto, and the multiple second tabs 320 may be bent from the second electrode body 310 along one side of the first direction ("Z" direction).

[0070] Furthermore, while multiple second tabs 320 can be bent from the second electrode body 310 in the same direction, some of the second tabs 320 can be bent in a different direction than the others. For example, some of the second tabs 320 can be bent from the second electrode body 310 to the other side of the first direction (opposite to the "Z" direction), while others can be bent from the second electrode body 310 to one side of the first direction (the "Z" direction).

[0071] However, one end of the second electrode 320 facing the first direction may be connected to the first electrode 200 adjacent to the second electrode 320 in the first direction (see...). Figure 1 The electrodes are spaced apart in the first direction. According to this structure, a short circuit can be prevented between the second electrode 320 and the first electrode 200 adjacent to it.

[0072] After the plurality of second tabs 320 are bent from the second electrode body 310, the second lead 520 can be soldered to the plurality of second tabs 320. The second lead 520 may include: a bonding region 521, which includes a section extending along a first direction and bonding with the plurality of second tabs 320; and a protruding region 522, which is bent from the bonding region 521. That is, the second lead 520 may be arranged in an "L" shape.

[0073] The protruding region 522 can extend from one end of the engagement region 521 in a first direction along the other side of the second direction (the direction opposite to the "X" direction). In this case, one end of the engagement region 521 in the first direction can be one end of the engagement region 521 facing the other side of the first direction (the direction opposite to the "Z" direction).

[0074] The angle between the mating area 521 and the protruding area 522 can be 90 degrees, but it can also form an acute angle less than 90 degrees or an obtuse angle greater than 90 degrees.

[0075] Each second tab 320 can be joined to the joining area 521. Multiple second tabs 320 can be joined to the joining area 521 by laser welding.

[0076] When the second lead 520 is joined to a plurality of second tabs 320 by laser welding, the second lead 520 can be electrically connected to all of the plurality of second tabs 320 spaced apart from each other in a first direction.

[0077] Furthermore, the protruding area 522 may be the portion of the second lead 520 that passes through the cover 700 and the outer casing. The protruding area 522 may be provided with a sealing member 530 for sealing the cover 700 and the outer casing. The sealing member 530 may extend in a manner that surrounds the protruding area 522, thereby sealing the portion passing through the cover 700 and the outer casing.

[0078] In the above description, only the structure of the second tab 320 and the second lead 520 is described. However, the description of the structure of the second lead 520 applies to the structure of the first lead 510, and the description of the structure of the second tab 320 applies to the structure of the first tab 220. However, the length of the bonding region of the first lead 510 in the first direction may be different from the length of the bonding region of the second lead 520 in the second direction.

[0079] In other words, the first tab 220 of the first electrode 200 can extend parallel to the first electrode body 210 before being stacked with the second electrode 300.

[0080] The width of the first electrode tab 220 in the third direction ("Y" direction or the direction opposite to "Y") can be formed to correspond to the width of the first electrode body 210 in the third direction. The width "W" of the first electrode tab 220 in the third direction can be formed to correspond to or be smaller than the width of the first electrode body 210 in the third direction. The width of the first electrode tab 220 in the third direction can be the same as the width of the first electrode body 210 in the third direction.

[0081] For example, the length of the first electrode tab 220 in the second direction can be set to be less than about 2.0 mm. In this case, the length of the first electrode tab 220 in the second direction can be its length before it bends from the first electrode body 210 along the first direction.

[0082] After the first electrode 200 and the second electrode 300 are stacked together, the first tab 220 can be bent from one side of the first electrode body 210 in the second direction ("X" direction) along the first direction. Multiple first tabs 220 can be spaced apart from each other in the first direction.

[0083] During the manufacturing process of the all-solid-state battery 100, multiple first tabs 220 can be bent from the first electrode body 210 along a first direction ("Z" direction or the opposite direction of "Z" direction) by a pressurizing process of a pressurizing plate, wherein the pressurizing plate moves from one side ("X" direction) of the second direction of the all-solid-state battery 100 to the other side (the opposite direction of "X" direction).

[0084] When the multiple first electrodes 220 are bent along the first direction, the multiple first electrodes 220 can be spaced apart from each other in the first direction.

[0085] Figure 1 The first tabs 220 are shown to be similar to the plurality of second tabs 320, bending from the first electrode body 210 toward the other side of the first direction (the direction opposite to the "Z" direction), but this disclosure is not limited thereto, and the plurality of first tabs 220 may be bent from the first electrode body 210 toward one side of the first direction (the "Z" direction).

[0086] Furthermore, while multiple first tabs 220 can be bent from the first electrode body 210 in the same direction, some of the first tabs 220 can be bent in a different direction than the others. For example, some of the first tabs 220 can be bent from the first electrode body 210 to the other side of the first direction (opposite to the "Z" direction), while the other first tabs 220 can be bent from the first electrode body 210 to one side of the first direction (the "Z" direction).

[0087] However, one end of the first electrode tab 220 facing the first direction may be spaced apart from the second electrode 300 adjacent to the first electrode tab 220 in the first direction. According to this structure, a short circuit can be prevented between the first electrode tab 220 and the second electrode 300 adjacent to it.

[0088] After the plurality of first tabs 220 are bent from the first electrode body 210, the first lead 510 can be soldered to the plurality of first tabs 220. Similar to the second lead 520, the first lead 510 may also include: a bonding region comprising a segment extending along a first direction and bonding to the plurality of first tabs 220; and a protruding region bent from one end of the bonding region facing the opposite side of the first direction (opposite to the “Z” direction) and extending toward one side of the second direction (“X” direction). Similar to the second lead 520, the first lead 510 may be arranged in an “L” shape.

[0089] The angle between the joint area and the protruding area of ​​the first lead 510 can be 90 degrees, but it can also form an acute angle less than 90 degrees or an obtuse angle greater than 90 degrees.

[0090] When multiple first tabs 220 are joined to the joining area of ​​the first lead 510 by laser welding, the first lead 510 can be electrically connected to all of the multiple first tabs 220 spaced apart from each other in the first direction.

[0091] The protruding area of ​​the first lead 510 can also be the portion of the first lead 510 that passes through the cover 700 and the outer shell. Therefore, the protruding area of ​​the first lead 510 can be provided with a sealing member 530 for sealing the cover 700 and the outer shell. The sealing member 530 can extend in a manner that surrounds the protruding area of ​​the first lead, thereby sealing the portion passing through the cover 700 and the outer shell.

[0092] According to the above structure, the width of the first tab 220 of the all-solid-state battery 100 can be formed to correspond to or be smaller than the width of the first electrode body 210. Furthermore, the width "W" of the second tab 320 can be formed to correspond to or be smaller than the width of the second electrode body 310. Because the size of the first electrode body 210 is larger than the size of the second electrode body 310, the width of the first tab 220 can be greater than the width of the second tab 320.

[0093] Furthermore, the first electrode tab 220 and the second electrode tab 320 can be bent from the first electrode body 210 and the second electrode body 310 respectively from opposite sides of the second direction ("X" direction or the direction opposite to "X" direction) toward the first direction.

[0094] In this case, with the multiple first tabs 220 and second tabs 320 spaced apart from each other in the first direction, they can be electrically connected to each other via the first lead 510 and the second lead 520.

[0095] According to this structure, even when a thermostatic pressure is applied to the all-solid-state battery 100, damage to the portion of the first tab 220 and the second tab 320 that bears pressure in the first direction can be prevented.

[0096] Therefore, the productivity and availability of the all-solid-state battery 100 are improved because the defect rate of the first tab 220 and the second tab 320 themselves can be reduced, or the electrical connection between the first tab 220 and the second tab 320 and the first lead 510 and the second lead 520 can be stably maintained.

[0097] To support this, exemplary embodiments, comparative examples, and experimental examples of this disclosure are provided below.

[0098] Example

[0099] In manufacturing an all-solid-state battery 100, the width "W" of the second electrode 320 in the third direction is 80 mm, and the length "L" in the second direction is 2 mm. The width "W" of the second electrode body 310 in the third direction can be set to 80 mm.

[0100] Comparative example

[0101] In manufacturing an all-solid-state battery, the width of the second tab in the third direction is 45 mm, and the length in the second direction is 22 mm.

[0102] Experimental Example

[0103] A temperature isostatic pressing (TIP) process was applied to twenty all-solid-state batteries according to exemplary embodiments and comparative examples. In this case, when the TIP process was applied to each of the twenty embodiments and twenty comparative examples, the number of exemplary embodiments and comparative examples in which damage occurred in the second tab 320 of the twenty exemplary embodiments and the second tab of the twenty comparative examples was measured.

[0104] In the case of the embodiment, the number of damaged second tabs 320 in twenty all-solid-state batteries 100 was determined to be 0.

[0105] In contrast, in the comparative case, the number of second tabs that broke in the all-solid-state battery was 16, and the defect rate was measured to be 80%.

[0106] The experimental results show that, compared with the comparative example, the defect rate of the all-solid-state battery 100 according to the exemplary embodiment is significantly reduced.

[0107] Figure 5 This is a flowchart of a method for manufacturing an all-solid-state battery according to an exemplary embodiment of the present disclosure.

[0108] Reference Figure 1 and Figure 5 A method for manufacturing an all-solid-state battery 100 according to an exemplary embodiment of the present disclosure may include operation S100: stacking at least one first electrode 200 and at least one second electrode 300, and stacking a solid electrolyte 400 between at least one first electrode 200 and at least one second electrode 300, together as a unit battery stack 110.

[0109] In this configuration, at least one first electrode 200 may include a first electrode body 210 and a first tab 220 connected to the first electrode body 210. The width of the first electrode body 210 in a third direction ("Y" direction or the direction opposite to "Y") may correspond to the width of the first tab 220 in the third direction.

[0110] Furthermore, at least one second electrode 300 may include a second electrode body 310 and a second tab 320 connected to the second electrode body 310. The width of the second electrode body 310 in a third direction may correspond to the width of the second tab 320 in a third direction.

[0111] A method of manufacturing an all-solid-state battery 100 according to an exemplary embodiment of the present disclosure may include operation S200: attaching a first tab 220 of each of at least one first electrode 200 to one side of a cell battery stack 110, and attaching a second tab 320 of each of at least one stacked second electrode 300 to the other side of the cell battery stack 110.

[0112] In this configuration, the first tab 220 can be attached to one side of the second direction ("X" direction) of the cell battery stack 110, and the second tab 320 can be attached to the other side of the second direction of the cell battery stack 110 (the direction opposite to the "X" direction).

[0113] The method of manufacturing an all-solid-state battery 100 according to an exemplary embodiment of the present disclosure may further include operation S300: connecting a first tab 220 of at least one attached first electrode 200 to a first lead 510, and connecting a second tab 320 of at least one attached second electrode 300 to a second lead 520.

[0114] In this configuration, the first lead 510 can be attached to one side of the cell stack 110 in the second direction (“X” direction), thereby achieving full electrical connection with at least one first tab 220. Furthermore, the second lead 520 can be attached to the other side of the cell stack 110 in the second direction (opposite to the “X” direction), thereby achieving full electrical connection with at least one second tab 320.

[0115] The method of manufacturing an all-solid-state battery 100 according to an exemplary embodiment of the present disclosure may further include operation S400: surrounding the stacked cell stack 110 with a cover 700.

[0116] A method for manufacturing an all-solid-state battery 100 according to an exemplary embodiment of the present disclosure may include operation S500: stacking the enclosed cell stack 110 on a jig plate 10 and pressurizing the cell stack 110. In this case, the pressurization process of the cell stack 110 may be performed by a warm isostatic press.

[0117] In the all-solid-state battery 100 according to an exemplary embodiment of the present disclosure, the first electrode body 210 and the first tab 220 may have the same width in a direction perpendicular to the length direction of the first electrode body 210, and the second electrode body 310 and the second tab 320 may have the same width in a direction perpendicular to the length direction of the second electrode body 310. Therefore, the first tab 220 and the second tab 320 may be attached to opposite sides of the cell stack 110.

[0118] With the first tab 220 and the second tab 320 attached to opposite sides of the cell stack 110, they are connected to the first lead 510 and the second lead 520, thereby preventing damage to the first tab 220 and the second tab 320 during the temperature isostatic pressing of the cell stack 110. Therefore, the productivity of the all-solid-state battery 100 can be improved.

[0119] According to this technology, when performing a warm isostatic pressing process on all-solid-state batteries, damage to the tabs of the electrode current collector can be prevented, thereby improving the productivity of all-solid-state batteries.

[0120] Furthermore, according to this technology, the durability of all-solid-state batteries can be improved because short circuits between the electrode current collector tabs and leads can be prevented.

[0121] In addition, various effects that can be obtained directly or indirectly through this disclosure may be provided.

[0122] The above description is merely an example of the technical concept of this disclosure, and those skilled in the art can make various modifications and changes without departing from the essential characteristics of this disclosure.

[0123] Therefore, the embodiments of this disclosure are intended to explain, rather than limit, the technical concept of this disclosure, and the scope and concept of this disclosure are not limited to the above embodiments. The scope of protection of this disclosure should be interpreted in accordance with the appended claims, and all equivalents thereof should be considered to be included within the scope of protection of this disclosure.

Claims

1. An all-solid-state battery, comprising: A plurality of first electrodes, wherein each first electrode includes a first electrode current collector, the first electrode current collector including a first electrode body and a first tab protruding from the first electrode body; A plurality of second electrodes are configured to have a polarity different from that of the first electrode and are stacked alternately with the first electrode in a first direction, wherein each second electrode includes a second electrode current collector, the second electrode current collector including a second electrode body and a second electrode tab protruding from the second electrode body; A solid electrolyte is disposed between the first electrode and the second electrode; and Lead wires connect to multiple first tabs or multiple second tabs. Wherein, the plurality of first electrodes and the plurality of second electrodes are spaced apart from each other in the first direction, and The lead wire includes a portion that is coupled to the plurality of first tabs or the plurality of second tabs and extends along the first direction.

2. The all-solid-state battery according to claim 1, in, The plurality of first tabs extend from one side of the first electrode body along the first direction, which intersects with the first direction, and, The plurality of second tabs extend from the other side of the second electrode body in the second direction along the first direction.

3. The all-solid-state battery according to claim 2, in, The end of the first electrode tab is spaced apart from the second electrode adjacent to the first electrode tab in the first direction, and, Wherein, the end of the second electrode tab is spaced apart from the first electrode adjacent to the second electrode tab in the first direction.

4. The all-solid-state battery according to claim 2, in, The plurality of first tabs extend from the first electrode body in the same direction, and, The plurality of second electrodes extend from the second electrode body in the same direction.

5. The all-solid-state battery according to claim 2, in, The width of the first electrode tab in the third direction intersecting the first and second directions corresponds to the width of the first electrode body in that third direction, and, The width of the second electrode tab in the third direction corresponds to the width of the second electrode body in the third direction.

6. The all-solid-state battery according to claim 1, wherein, The lead wire includes: The mating region includes a segment extending along the first direction to mat with the plurality of first tabs or the plurality of second tabs; and The protruding area extends from the joint area.

7. The all-solid-state battery according to claim 6, wherein, The protruding region extends from one end of the joining region along a second direction intersecting the first direction.

8. The all-solid-state battery according to claim 6, further comprising: The outer casing covers the plurality of first electrodes and the plurality of second electrodes. The protruding area of ​​the lead wire passes through the outer casing.

9. The all-solid-state battery according to claim 1, further comprising: An edge member extends along the outer periphery of the second electrode body and contacts the second electrode body.

10. The all-solid-state battery according to claim 9, wherein, The edge member includes an edge hole through which the second electrode tab passes.

11. The all-solid-state battery according to claim 9, wherein, The second electrode tab protrudes to the other side of the second direction, which intersects the first direction, while in contact with one surface of the edge member facing the first direction.

12. The all-solid-state battery according to claim 10, wherein, The edge member is formed of a polymer film.

13. The all-solid-state battery according to claim 1, wherein, Each first electrode is a negative electrode, and each second electrode is a positive electrode.

14. A method for manufacturing an all-solid-state battery, the method comprising the following steps: At least one first electrode and at least one second electrode are stacked alternately, and at least one solid electrolyte is stacked between the at least one first electrode and the at least one second electrode to form a unit battery stack. The at least one first electrode includes a first electrode body and a first tab, the width of which corresponds to the width of the first electrode body in the direction intersecting the length direction of the first electrode body. The at least one second electrode includes a second electrode body and a second tab, the width of which corresponds to the width of the second electrode body in the direction intersecting the length direction of the second electrode body. The stacked cell units are enclosed by a cover; and The cell stacks, enclosed by the cover, are stacked on a fixture plate and pressurized.

15. The method of claim 14, further comprising the step of: The first tab of each of at least one stacked first electrode is attached to one side of the cell stack, and the second tab of each of at least one stacked second electrode is attached to the other side of the cell stack. as well as A first lead is connected to the first tab attached to the at least one first electrode, and a second lead is connected to the second tab attached to the at least one second electrode.

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