All-solid battery

1. An all-solid-state battery comprising:

a laminate;

a positive electrode-side external electrode; and

a negative electrode-side external electrode,

wherein the laminate includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer between the positive electrode layer and the negative electrode layer,

wherein the positive electrode-side external electrode is connected to the positive electrode layer on a positive electrode-side end surface of the laminate,

wherein the negative electrode-side external electrode is connected to the negative electrode layer on a negative electrode-side end surface of the laminate,

wherein the positive electrode layer includes a positive electrode main portion extending from the positive electrode-side end surface to the negative electrode-side end surface and a positive electrode auxiliary portion which protrudes from the positive electrode main portion along the positive electrode-side end surface and reaches a side surface intersecting the positive electrode-side end surface in a plan view from a lamination direction of the laminate,

wherein the negative electrode layer includes a negative electrode main portion extending from the negative electrode-side end surface to the positive electrode-side end surface and a negative electrode auxiliary portion which protrudes from the negative electrode main portion along the negative electrode-side end surface and reaches the side surface intersecting the positive electrode-side end surface from the negative electrode main portion in the plan view from the lamination direction of the laminate, and

wherein, when viewed in the plan view from the lamination direction, a length L 1 of the positive electrode auxiliary portion on the side surface, a length L 2 of the negative electrode auxiliary portion on the side surface, and a length L 3 of the side surface satisfy a relation below

20 μm≤(L 1 +L 2 )<L 3   (1).

2. The all-solid-state battery according to claim 1 ,

wherein, when viewed in a plan view from the lamination direction, a length L 1 of the positive electrode auxiliary portion on the side surface, a length L 2 of the negative electrode auxiliary portion on the side surface, and a length L 3 on the side surface satisfy a relation below

60 μm≤(L 1 +L 2 )<L 3   (2).

3. The all-solid-state battery according to claim 1 ,

wherein the length L 1 of the positive electrode auxiliary portion on the side surface is the same as the length L 2 of the negative electrode auxiliary portion on the side surface.

4. The all-solid-state battery according to claim 1 ,

wherein the length L 1 of the positive electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 1 ≤(L 3 ×49%)  (3).

5. The all-solid-state battery according to claim 1 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

6. The all-solid-state battery according to claim 2 ,

wherein the length L 1 of the positive electrode auxiliary portion on the side surface is the same as the length L 2 of the negative electrode auxiliary portion on the side surface.

7. The all-solid-state battery according to claim 2 ,

wherein the length L 1 of the positive electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 1 ≤(L 3 ×49%)  (3).

8. The all-solid-state battery according to claim 3 ,

wherein the length L 1 of the positive electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 1 ≤(L 3 ×49%)  (3).

9. The all-solid-state battery according to claim 6 ,

wherein the length L 1 of the positive electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 1 ≤(L 3 ×49%)  (3).

10. The all-solid-state battery according to claim 2 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

11. The all-solid-state battery according to claim 3 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

12. The all-solid-state battery according to claim 4 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

13. The all-solid-state battery according to claim 6 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

14. The all-solid-state battery according to claim 7 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

15. The all-solid-state battery according to claim 8 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

16. The all-solid-state battery according to claim 9 ,

wherein the length L 2 of the negative electrode auxiliary portion on the side surface and the length L 3 on the side surface satisfy a relation below

(L 3 ×2%)≤L 2 ≤(L 3 ×49%)  (4).

17. The all-solid-state battery according to claim 1 , wherein

the positive electrode auxiliary portion is in direct contact with the positive electrode-side end surface of the laminate, and

the negative electrode auxiliary portion is in direct contact with the negative electrode-side end surface of the laminate.