KR-20260062731-A - ALL-SOLID RECHARGEABLE BATTERY AND MANUFACTURING METHOD OF THE SAME

Abstract

The present invention provides an all-solid-state secondary battery. The all-solid-state secondary battery comprises a unit cell comprising a first electrode, a solid electrolyte layer, and a second electrode, and a stack formed by stacking a plurality of said unit cells; a case in which a first part case and a second part case separated to accommodate said stack are welded to each form an opening on both sides in a first direction; and a first sub-plate of said first electrode and a second sub-plate of said second electrode, which are respectively welded to said first tabs and said second tabs by gathering said first tabs of said first electrode and said second tabs of said second electrode, said first tabs of said first electrode and said second tabs of said second electrode, said first tabs of said first electrode and said second tabs of said second electrode, said first sub-plate of said first electrode and said second sub-plate of said second electrode, said second sub-plate of said second electrode, said first sub-plate of said first electrode and said second sub-plate of said second electrode, said first

Inventors

• 서용철
• 하지광
• 송경선
• 김백건
• 이유정
• 이재엽

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260507

Application Date

20241029

Claims (20)

1. A first step of forming a unit cell comprising a first electrode, a solid electrolyte layer, and a second electrode, and stacking the unit cells in plurality to form a stack; A second step of forming an insulating layer on the inner surface and side of a separated first part case and a second part case to form a case to accommodate the stack; A third step of arranging the first part case and the second part case on both sides of the stacking direction of the stack and welding the first part case and the second part case together by pressing them; and A fourth step of each assembling the first tabs of the first electrode and the second tabs of the second electrode to correspond to the insulating layer, and welding the first subplate of the first electrode and the second subplate of the second electrode to the first tabs and the second tabs, respectively. A method for manufacturing an all-solid-state secondary battery including
2. In paragraph 1, The above second step is A method for manufacturing an all-solid-state secondary battery, wherein the insulating layer is formed by any one of anodizing, insulating material coating, and insulating tape attachment.
3. In paragraph 1, The above third step is A method for manufacturing an all-solid-state secondary battery, wherein the first part case and the second part case are butt-welded to form the case having openings on both sides in the first direction.
4. In paragraph 3, The above third step is A method for manufacturing an all-solid-state secondary battery, forming a butt welding line between the first part case and the second part case.
5. In paragraph 4, The above third step is A method for manufacturing an all-solid-state secondary battery, wherein the welding line is formed by a repeating curved line along the first direction on both sides of the second direction intersecting the first direction.
6. In paragraph 1, The above second step is Corresponding to the first tabs and the second tabs at the opening side of the case provided on both sides of the first direction, A first insulating layer is formed on the inner surface of the first part case and the second part case, and A method for manufacturing an all-solid-state secondary battery, wherein a second insulating layer is formed on the side of the first part case and the second part case connected to the inner surface.
7. In paragraph 6, The above second step is A method for manufacturing an all-solid-state secondary battery, wherein the second insulating layer is formed in the recessed groove formed on the side of the first part case and the second part case.
8. In paragraph 1, The above fourth step is A double-tap structure is formed in which the first taps are drawn out in a positive first direction from both ends of the second direction intersecting the first direction, and A method for manufacturing an all-solid-state secondary battery, forming a double-tap structure in which the second taps are drawn out in a negative (-) first direction from both ends of the second direction.
9. In paragraph 8, The above fourth step is One side of the above double-tap structure, the first tabs are raised in a positive (+) stacking direction and gathered to come into contact with the first insulating layer or the second insulating layer, and A method for manufacturing an all-solid-state secondary battery, wherein the first tabs on the other side of the above double-tab structure are lowered in a negative (-) stacking direction and gathered to come into contact with the first insulating layer or the second insulating layer.
10. In Paragraph 9, The above fourth step is The first tabs that are raised and gathered from one side of the above double-tap structure, and the first tabs that are lowered and gathered from the other side A method for manufacturing an all-solid-state secondary battery by plate welding both sides of the first sub-plate.
11. In paragraph 8, The above fourth step is One side of the above double-tap structure, the second tabs are raised in a positive (+) stacking direction and gathered to come into contact with the first insulating layer or the second insulating layer, and A method for manufacturing an all-solid-state secondary battery, wherein the second tabs on the other side of the above double-tab structure are lowered in a negative (-) stacking direction and gathered to come into contact with the first insulating layer or the second insulating layer.
12. In Paragraph 11, The above fourth step is The second tabs that are raised and gathered from one side of the above double-tap structure, and the second tabs that are lowered and gathered from the other side A method for manufacturing an all-solid-state secondary battery by plate welding both sides of the above-mentioned second sub-plate.
13. In paragraph 1, The first tabs welded to each other and the first cap assembly coupled to the case on the side of the first sub-plate are welded to the case, and The second tabs welded to each other and the second cap assembly coupled to the case on the side of the second sub-plate are welded to the case. A method for manufacturing an all-solid-state secondary battery, further comprising a fifth step.
14. In Paragraph 12, The first subplate is welded to the first terminal plate of the first cap assembly, and Welding the second sub-plate to the second terminal plate of the second cap assembly A method for manufacturing an all-solid-state secondary battery, further comprising a sixth step.
15. A stack formed by forming a unit cell comprising a first electrode, a solid electrolyte layer, and a second electrode, and stacking the unit cells in plurality; A case formed by welding a separated first part case and a second part case to accommodate the stack to each form an opening on both sides in the first direction; and The first subplate of the first electrode and the second subplate of the second electrode, which are respectively assembled by gathering the first tabs of the first electrode and the second tabs of the second electrode and welding them to the first tabs and the second tabs, respectively. Includes, The above case is Insulating layers are provided on the inner surface and sides of the above opening, The above first tabs and the above second tabs All-solid-state secondary battery corresponding to the above insulating layer.
16. In paragraph 15, The above insulating layer is formed from any one of anodizing, a coated insulating material, and an insulating tape, in a solid-state secondary battery.
17. In paragraph 15, The above insulating layer Corresponding to the first tabs and the second tabs at the opening side of the case provided on both sides of the first direction, A first insulating layer formed on the inner surface of the first part case and the second part case, and A solid-state secondary battery comprising a first part case connected to the inner surface and a second insulating layer formed on the side of the second part case.
18. In paragraph 15, The above first tabs A double tap structure is formed that is drawn out in the first direction (+) from both ends of the second direction intersecting the first direction, and The above second tabs A solid-state secondary battery forming a double-tap structure that is drawn out in the first direction of the negative (-) from both ends of the second direction above.
19. In Paragraph 18, The first tabs on one side of the above double-tap structure It is gathered while being raised in the positive (+) stacking direction and comes into contact with the first insulating layer or the second insulating layer, The other side of the above double-tap structure, the first tabs A solid-state secondary battery that is gathered downward in the negative (-) stacking direction and contacts the first insulating layer or the second insulating layer.
20. In Paragraph 18, The second tabs on one side of the above double-tap structure It is gathered while being raised in the positive (+) stacking direction and comes into contact with the first insulating layer or the second insulating layer, The other side of the above double-tap structure, the second tabs A solid-state secondary battery that is gathered downward in the negative (-) stacking direction and contacts the first insulating layer or the second insulating layer.

Description

All-solid rechargeable battery and manufacturing method of the same The present disclosure relates to an all-solid-state secondary battery and a method for manufacturing the same. Recently, driven by industrial demands, the development of batteries with high energy density and safety is actively underway. For example, lithium-ion batteries are being commercialized not only in the fields of information and communication devices but also in the automotive sector. In the automotive sector, safety is considered particularly important because it is directly related to human life. Currently commercially available lithium-ion batteries use electrolytes containing flammable organic solvents, so there is a possibility of overheating and fire in the event of a short circuit. In response to this, all-solid-state secondary batteries using solid electrolytes instead of liquid electrolytes are being proposed. All-solid-state secondary batteries can significantly reduce the likelihood of fire or explosion in the event of a short circuit by not using flammable organic solvents. Therefore, these all-solid-state batteries can offer significantly higher safety compared to lithium-ion batteries that use liquid electrolytes. The information described above, disclosed in the background technology of this invention, is intended only to enhance understanding of the background of this disclosure and may therefore include information that does not constitute prior art. FIG. 1 is a cross-sectional view showing an all-solid-state secondary battery according to one embodiment. FIG. 2 is a cross-sectional view showing the formation of a lithium metal layer of an all-solid-state secondary battery according to one embodiment. FIG. 3 is a flowchart of a method for manufacturing an all-solid-state secondary battery according to one embodiment of the present invention. Figure 4 is a perspective view of the step of forming a stack in the manufacturing method of Figure 3. Figure 5 is a cross-sectional view of the case in the manufacturing method of Figure 3, with an insulating layer formed thereon. Figures 6 and 7 are perspective views of the state before and after welding of the step of welding the case in the manufacturing method of Figure 3. FIGS. 8 and 9 are perspective views of the state before and after welding of the step of welding the first subplate of the first electrode and the second subplate of the second electrode to the first tab of the first electrode and the second tab of the second electrode, respectively, in the manufacturing method of FIG. 3. FIG. 10 is an enlarged cross-sectional view illustrating the relationship between the first and second tabs welded to the first and second subplates after welding of FIG. 9 and the insulating layer formed on the inner surface of the case. FIGS. 11 and FIGS. 12 are perspective views of the state before and after welding of the step of welding the first and second cap assemblies to the case in the manufacturing method of FIG. 3. FIG. 13 is a perspective view of the first and second cap assemblies used in FIG. 11. FIG. 14 is a perspective view of an all-solid-state secondary battery according to an embodiment of the present invention, in which the first and second terminals of the first and second electrodes are welded to the first and second subplates during the manufacturing method of FIG. 3. Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In the drawings, thicknesses have been enlarged to clearly represent various layers and regions, and the same reference numerals have been used for similar parts throughout the specification. When a part such as a layer, film, region, or plate is described as being "on" or "on" another part, this includes not only cases where it is "immediately on" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately on" another part, it means that there is no other part in between. In addition, the term "layer" here includes not only shapes formed on the entire surface when viewed in a plan view, but also shapes formed on some surfaces. Here, "or" is not interpreted in an exclusive sense, and for example, "A or B" is interpreted to include A, B, A+B, etc. cathode for all-solid-state secondary batteries In one embodiment, a positive electrode for an all-solid-state secondary battery is provided, comprising a current collector and a positive active material layer located on the current collector, wherein t