Battery cell, battery, electric apparatus, and energy storage apparatus
A battery cell, a battery, an electric apparatus, and an energy storage apparatus are provided. The battery cell includes a housing and at least one electrode assembly disposed within the housing. The housing is shaped as a right parallelepiped and defined by three mutually perpendicular dimensions: W1, T1, and H1. The housing comprises six walls: opposing first and second walls along the W1 direction, opposing third and fourth walls along the T1 direction, and opposing fifth and sixth walls along the H1 direction. The sum of the thicknesses of each pair of opposing walls is denoted as a, b, and c, respectively. The effective internal volume ratio of the housing satisfies (W1−a)×(T1−b)×(H1−c)/(W1×T1×H1)≥90%. This configuration enhances the volumetric energy density of the battery cell while maintaining the same chemical material system.
1 . A battery cell with a capacity greater than 350 Ah comprising:
a housing;
electrode terminals, wherein the electrode terminals are disposed on the housing; and
at least one electrode assembly, wherein the electrode assembly is accommodated within the housing, the electrode assembly comprising a body and tabs extending from the body, the tabs being electrically connected to the electrode terminals, and a positive electrode material of the electrode assembly comprising lithium-containing phosphate; wherein
the housing is a right parallelepiped, a size of the housing in a first direction being W 1 , a size of the housing in a second direction being T 1 , a size of the housing in a third direction being H 1 , and the first direction, the second direction, and the third direction being mutually perpendicular; and
the housing comprises a first wall and a second wall disposed opposite each other along the first direction, a third wall and a fourth wall disposed opposite each other along the second direction, and a fifth wall and a sixth wall disposed opposite each other along the third direction, a sum of thicknesses of the first wall and the second wall being a, a sum of thicknesses of the third wall and the fourth wall being b, a sum of thicknesses of the fifth wall and the sixth wall being c, satisfying: (W 1 −a)*(T 1 −b)*(H 1 −c)/(W 1 *T 1 *H 1 )≥90%, and a capacity of the battery cell being C, satisfying: C/((W 1 −a)*(T 1 −b)*(H 1 −c))≥118 Ah/L, 5000 cm 3 ≤W 1 *T 1 *H 1 ≤40000 cm 3 ,
the housing comprises a housing body and an end cap, the housing body having an opening, and the end cap covering the opening, the housing body comprises the first wall, the second wall, the third wall, the fourth wall, and the fifth wall formed integrally, and the end cap is the sixth wall, the thickness of the first wall and the thickness of the second wall are both a 1 , the thickness of the third wall and the thickness of the fourth wall are both b 1 , the thickness of the fifth wall is c 1 , the thickness of the sixth wall is c 2 , satisfying: 0.5 mm≤a 1 ≤1.5 mm, 0.5≤b 1 ≤1.5 mm, 1.0 mm≤c 1 ≤2.5 mm, 2.5 mm≤c 2 ≤4 mm, c 1 >a 1 , and c 1 >b 1 .
2 . The battery cell according to claim 1 , wherein (W 1 −a)*(T 1 −b)*(H 1 −c)/(W 1 *T 1 *H 1 )≥92%.
3 . The battery cell according to claim 1 , wherein (W 1 −a)/W 1 ≥97.0%, (T 1 −b)/T 1 ≥96.5%, and (H 1 −c)/H 1 ≥96.5%.
4 . The battery cell according to claim 1 , wherein c1 and c2 satisfy: c 2 >c 1 .
5 . The battery cell according to claim 1 , wherein 0.6 mm≤a 1 ≤1.2 mm, 0.6 mm≤b 1 ≤1.2 mm, 1.5 mm≤c 1 ≤2.4 mm, 2.5 mm≤c 2 ≤3.8 mm.
6 . The battery cell according to claim 1 , wherein the battery cell further comprises a first insulating member and a second insulating member, the first insulating member being disposed between the fifth wall and the electrode assembly and abutting against the fifth wall; and the second insulating member being disposed between the sixth wall and the electrode assembly and abutting against the sixth wall; and, wherein
a maximum size of the first insulating member in the third direction is d 1 , and a maximum size of the second insulating member in the third direction is d 2 , satisfying:
(
W
1
-
a
-
1.6
mm
)
*
(
T
1
-
b
-
1.6
mm
)
*
(
H
1
-
c
-
d
1
-
d
2
)
/
(
W
1
*
T
1
*
H
1
)
≥
88
%
,
0.3
mm
≤
d
1
≤
1.2
mm
,
and
2
mm
≤
d
2
≤
10
mm
.
7 . The battery cell according to claim 1 , wherein the battery cell further comprises a first insulating member and a second insulating member, the first insulating member being disposed between the fifth wall and the electrode assembly and abutting against the fifth wall; and the second insulating member being disposed between the sixth wall and the electrode assembly and abutting against the sixth wall; wherein
a maximum size of the first insulating member in the third direction is d 1 , and a maximum size of the second insulating member in the third direction is d 2 , satisfying:
(
W
1
-
a
-
4
mm
)
*
(
T
1
-
b
-
4
mm
)
*
(
H
1
-
c
-
d
1
-
d
2
)
/
(
W
1
*
T
1
*
H
1
)
≥
85
%
,
0.3
mm
≤
d
1
≤
1.2
mm
,
and
2
mm
≤
d
2
≤
10
mm
.
8 . The battery cell according to claim 1 , wherein 10000 cm 3 ≤W 1 *T 1 *H 1 ≤40000 cm 3 .
9 . The battery cell according to claim 8 , wherein 15000 cm 3 ≤W 1 *T 1 *H 1 ≤32000 cm 3 .
10 . The battery cell according to claim 1 , wherein the body is a flat structure; and
one electrode assembly is provided, a maximum size of the body in the first direction is W 2 , a maximum size of the body in the second direction is T 2 , and a maximum size of the body in the third direction is H 2 , satisfying: (W 2 *T 2 *H 2 )/(W 1 *T 1 *H 1 )≥80%; or
a plurality of electrode assemblies are provided, a maximum size in the first direction of a unified whole composed of the bodies of the plurality of electrode assemblies is W 2 , a maximum size in the second direction of the unified whole composed of the bodies of the plurality of electrode assemblies is T 2 , and a maximum size in the third direction of the unified whole composed of the bodies of the plurality of electrode assemblies is H 2 , satisfying: (W 2 *T 2 *H 2 )/(W 1 *T 1 *H 1 )≥80%.
11 . The battery cell according to claim 10 , wherein W 2 /(W 1 −a)≥91.5%, T 2 /(T 1 −b)≥93.2%, and H 2 /(H 1 −c)≥94.0%.
12 . The battery cell according to claim 10 , wherein the electrode assembly is a wound structure, and the body comprises a flat region, a first bent region, and a second bent region, along the first direction, the first bent region and the second bent region being located at two ends of the flat region, respectively; wherein
the first bent region comprises a plurality of first bent portions arranged in layers, along the first direction, a distance between an inner vertex of an innermost first bent portion and an outer vertex of an outermost first bent portion among the plurality of first bent portions being W 3 ;
the second bent region comprises a plurality of second bent portions arranged in layers, along the first direction, a distance between an inner vertex of an innermost second bent portion and an outer vertex of an outermost second bent portion among the plurality of second bent portions being W 4 ; and
(W 3 +W 4 )/W 2 ≤30% is satisfied.
13 . A battery cell with a capacity greater than 350 Ah comprising:
a housing;
electrode terminals, wherein the electrode terminals are disposed on the housing; and
at least one electrode assembly, wherein the electrode assembly is accommodated within the housing, the electrode assembly comprising a body and tabs extending from the body, the tabs being electrically connected to the electrode terminals, and a positive electrode material of the electrode assembly comprising lithium-containing phosphate; wherein
the housing is a right parallelepiped, a size of the housing in a first direction being W 1 , a size of the housing in a second direction being T 1 , a size of the housing in a third direction being H 1 , and the first direction, the second direction, and the third direction being mutually perpendicular; and
the housing comprises a first wall and a second wall disposed opposite each other along the first direction, a third wall and a fourth wall disposed opposite each other along the second direction, and a fifth wall and a sixth wall disposed opposite each other along the third direction, a sum of thicknesses of the first wall and the second wall being a, a sum of thicknesses of the third wall and the fourth wall being b, a sum of thicknesses of the fifth wall and the sixth wall being c, satisfying: (W 1 −a)*(T 1 −b)*(H 1 −c)/(W 1 *T 1 *H 1 )≥90%, and a capacity of the battery cell being C, satisfying: C/((W 1 −a)*(T 1 −b)*(H 1 −c))≥118 Ah/L, 5000 cm 3 ≤W 1 *T 1 *H 1 ≤40000 cm 3 ,
wherein the housing comprises a housing body and two end caps, the housing body having two openings disposed opposite each other along the third direction, and the two end caps respectively covering the openings on corresponding sides; wherein
the housing body comprises the first wall, the second wall, the third wall, and the fourth wall formed integrally, and the two end caps are the fifth wall and the sixth wall, respectively,
the thickness of the first wall and the thickness of the second wall are both a 1 , the thickness of the third wall and the thickness of the fourth wall are both b 1 , the thickness of the fifth wall is c 1 , and the thickness of the sixth wall is c 2 , satisfying: 0.5 mm≤a 1 ≤1.5 mm, 0.5≤b 1 ≤1.5 mm, 1.0 mm≤c 1 ≤2.5 mm, 2.5 mm≤c 2 ≤4 mm, c 1 >a 1 , and c 1 >b 1 .
14 . The battery cell according to claim 13 , wherein c 1 and c 2 satisfy: c 2 =c 1 .
15 . The battery cell according to claim 13 , wherein c 1 and c 2 satisfy: c 2 >c 1 .
16 . The battery cell according to claim 13 , wherein the battery cell further comprises a third insulating member and a fourth insulating member, the third insulating member being disposed between the fifth wall and the electrode assembly and abutting against the fifth wall; and the fourth insulating member being disposed between the sixth wall and the electrode assembly and abutting against the sixth wall; wherein
a maximum size of the third insulating member in the third direction is d 3 , and a maximum size of the fourth insulating member in the third direction is d 4 , satisfying:
(
W
1
-
a
-
1.6
mm
)
*
(
T
1
-
b
-
1.6
mm
)
*
(
H
1
-
c
-
d
3
-
d
4
)
/
(
W
1
*
T
1
*
H
1
)
≥
88
%
,
2
mm
≤
d
3
≤
10
mm
,
and
2
mm
≤
d
4
≤
10
mm
.
17 . The battery cell according to claim 13 , wherein the battery cell further comprises a third insulating member and a fourth insulating member, the third insulating member being disposed between the fifth wall and the electrode assembly and abutting against the fifth wall; and the fourth insulating member being disposed between the sixth wall and the electrode assembly and abutting against the sixth wall; wherein
a maximum size of the third insulating member in the third direction is d 3 , and a maximum size of the fourth insulating member in the third direction is d 4 , satisfying:
(
W
1
-
a
-
4
mm
)
*
(
T
1
-
b
-
4
mm
)
*
(
H
1
-
c
-
d
3
-
d
4
)
/
(
W
1
*
T
1
*
H
1
)
≥
85
%
,
2
mm
≤
d
3
≤
10
mm
,
and
2
mm
≤
d
4
≤
10
mm
.