BATTERY CELL, METHOD AND SYSTEM FOR MANUFACTURING BATTERY CELL, BATTERY AND ELECTRICAL DEVICE

1 . A battery cell, comprising:

an electrode assembly;

a casing for accommodating the electrode assembly, an outer surface of the casing comprising an outer side surface parallel to a first direction and a first surface connected with the outer side surface, the outer side surface being arranged surrounding the electrode assembly, the first surface intersecting the first direction; and

a first electrode terminal convexly arranged on the first surface and for electrically connecting with the electrode assembly, the first electrode terminal not protruding, in the first direction, from an outermost end of the first surface along the first direction.

2 . The battery cell of claim 1 , wherein in a direction perpendicular to the first direction, the first electrode terminal does not protrude from the outer side surface.

3 . The battery cell of claim 1 , wherein

the outer side surface comprises two second surfaces arranged oppositely along a second direction, and a third surface and a fourth surface arranged oppositely along a third direction, each of the second surfaces is connected with the third surface and the fourth surface, the first direction, the second direction and the third direction are perpendicular to each other; and

the first surface is connected to an end of the third surface along the first direction and inclines towards the fourth surface relative to the third surface, and the first surface is connected with the two second surfaces.

4 . The battery cell of claim 3 , wherein an angle between the first surface and the third surface is θ, and 90°<θ<180°.

5 . The battery cell of claim 4 , wherein 120°≤θ≤150°.

6 . The battery cell of claim 3 , wherein

a size of the first surface along a fourth direction is L, a size of the first electrode terminal along the fourth direction is W, the fourth direction is parallel to the first surface and perpendicular to the second direction;

a size of a part of the first electrode terminal protruding from the first surface along a fifth direction is H, the fifth direction is perpendicular to the first surface; and

L, W, H and θ satisfy:

W

≤

L

-

H

/

(

cos

⁢

θ

⁢

sin

⁢

θ

)

.

7 . The battery cell of claim 3 , wherein the second surface is a surface having the largest area among all surfaces of the casing.

8 . The battery cell of claim 3 , wherein the first surface is connected with the third surface and the fourth surface.

9 . The battery cell of claim 3 , wherein

the outer surface of the casing further comprises a fifth surface perpendicular to the first direction and connected with the two second surfaces, and the fifth surface is connected to an end of the first surface away from the third surface; and

the fifth surface is located at an outermost end of the battery cell along the first direction.

10 . The battery cell of claim 3 , wherein

the outer surface of the casing further comprises a sixth surface connected with the two second surfaces; and

the battery cell further comprises a second electrode terminal convexly arranged on the sixth surface and for electrically connecting with the electrode assembly, the second electrode terminal not protruding, in the first direction, from an outermost end of the sixth surface along the first direction.

11 . The battery cell of claim 10 , wherein the first surface and the sixth surface are respectively connected to two ends of the third surface along the first direction.

12 . The battery cell of claim 11 , wherein the first surface is connected to one end of the third surface along the first direction and one end of the fourth surface along the first direction, and the sixth surface is connected to the other end of the third surface along the first direction and the other end of the fourth surface along the first direction.

13 . The battery cell of claim 12 , wherein the first surface is parallel to the sixth surface.

14 . The battery cell of claim 11 , wherein

the outer surface of the casing further comprises a fifth surface and a seventh surface respectively located at two ends of the battery cell along the first direction;

two ends of the fifth surface along the second direction are respectively connected to the two second surfaces, two ends of the fifth surface along the third direction are respectively connected to the first surface and the fourth surface; and

two ends of the seventh surface along the second direction are respectively connected to the two second surfaces, two ends of the seventh surface along the third direction are respectively connected to the sixth surface and the fourth surface.

15 . The battery cell of claim 14 , wherein the battery cell is symmetrical about a plane perpendicular to the first direction.

16 . The battery cell of claim 10 , wherein

the outer surface of the casing further comprises a fifth surface and a seventh surface respectively located at two ends of the battery cell along the first direction;

two ends of the fifth surface along the second direction are respectively connected to the two second surfaces, two ends of the fifth surface along the third direction are respectively connected to the first surface and the fourth surface;

two ends of the seventh surface along the second direction are respectively connected to the two second surfaces, two ends of the seventh surface along the third direction are respectively connected to the sixth surface and the third surface; and

the sixth surface is connected with the fourth surface and inclines towards the third surface.

17 . The battery cell of claim 10 , wherein the sixth surface is connected to an end of the fourth surface close to the first surface along the first direction, and the sixth surface inclines with respect to the fourth surface along a direction facing the first surface.

18 . The battery cell of claim 17 , wherein the battery cell is symmetrical about a plane perpendicular to the third direction.

19 . The battery cell of claim 17 , wherein

the outer surface of the casing further comprises a fifth surface and a seventh surface respectively located at two ends of the battery cell along the first direction;

two ends of the fifth surface along the second direction are respectively connected to the two second surfaces, two ends of the fifth surface along the third direction are respectively connected to the first surface and the sixth surface; and

two ends of the seventh surface along the second direction are respectively connected to the two second surfaces, two ends of the seventh surface along the third direction are respectively connected to the third surface and the fourth surface.

20 . A battery, comprising a plurality of the battery cells of claim 1 .