Flexible electrode, display apparatus and wearable device
Disclosed in the present disclosure are a flexible electrode, a display apparatus and a wearable device, which are used for avoiding the defects, such as bubbles, wrinkles and cracks, which occur in an area between adjacent energy storage units, during a bending process of a flexible battery. A flexible battery is provided in the embodiments of the present disclosure. The flexible battery comprises: a supporting layer; a flexible conductive layer, which is located on one side of the supporting layer; a plurality of energy storage units, which are arranged at intervals, in a first direction, on the side of the flexible conductive layer that is away from the supporting layer, and are electrically connected to the flexible conductive layer; and a first package structure, which comprises a protruding portion covering the energy storage units, and a recessed portion located between the adjacent energy storage units.
1 . A flexible battery, comprising:
a supporting layer;
a flexible conductive layer on a side of the supporting layer;
a plurality of energy storage elements, arranged at intervals in a first direction on a side of the flexible conductive layer away from the supporting layer, and electrically connected to the flexible conductive layer; and
a first package structure, comprising a protruding portion covering the energy storage elements and a recessed portion between the adjacent energy storage elements, wherein an elastic modulus of the first package structure ranges from 30 MPa to 100 MPa.
2 . The flexible battery according to claim 1 , wherein the elastic modulus of the first package structure ranges from 40 MPa to 50 MPa.
3 . The flexible battery according to claim 1 , wherein a thickness of the first package structure in a direction perpendicular to the supporting layer ranges from 150 microns to 200 microns.
4 . The flexible battery according to claim 1 , wherein the first package structure comprises:
a first barrier layer;
a first metal layer on a side of the first barrier layer away from the energy storage element;
a first bonding layer on a side of the first metal layer away from the first barrier layer;
a second barrier layer on a side of the first bonding layer away from the first metal layer; and
a third barrier layer on a side of the second barrier layer away from the first bonding layer.
5 . The flexible battery according to claim 4 , wherein a material of the first barrier layer comprises polypropylene, a material of the first metal layer comprises aluminum, a material of the second barrier layer comprises nylon, and a material of the third barrier layer comprises a resin.
6 . The flexible battery according to claim 1 , further comprising:
a second package structure on a side of the supporting layer away from the first package structure, wherein an elastic modulus of the second package structure ranges from 30 MPa to 100 MPa;
wherein the flexible conductive layer is further on a side of the supporting layer close to the second package structure, and the plurality of energy storage elements are further on a side of the flexible conductive layer close to the second package structure.
7 . The flexible battery according to claim 1 , wherein a distance between any two adjacent energy storage elements is equal in the first direction.
8 . The flexible battery according to claim 7 , wherein a battery capacity C unit of each of the energy storage elements satisfies the following condition:
C unit =Δ×t×e ×( W−f ),
wherein Δ is a volume energy density of the energy storage element, t is a thickness of the first conductive layer, e is a width of the energy storage element in the first direction, W is a width of the supporting layer in a direction perpendicular to the first direction, and f is a distance between an edge of the supporting layer extending in the first direction and the energy storage element.
9 . The flexible battery according to claim 7 , wherein a width e of the energy storage element in the first direction satisfies the following condition:
e
=
c
u
n
i
t
Δ
×
t
×
(
W
-
f
)
+
a
,
wherein C unit is a battery capacity of each of the energy storage elements, Δ is a volume energy density of the energy storage element, t is a thickness of the first conductive layer, W is a width of the supporting layer in a direction perpendicular to the first direction, f is a distance between an edge of the supporting layer extending in the first direction and the energy storage element, and a is a thickness of the first package structure in a direction perpendicular to the flexible conductive layer.
10 . The flexible battery according to claim 7 , wherein a battery capacity C unit of each of the energy storage elements satisfies the following condition:
C
u
n
i
t
=
c
total
N
,
wherein C total is a total capacity of the flexible battery, and N is a quantity of energy storage elements.
11 . The flexible battery according to claim 7 , wherein a minimum bending radius r of the flexible conductive layer, a distance d between two adjacent energy storage elements, and a width e of the energy storage element in the first direction satisfy the following condition:
2
sin
(
d
4
ρ
+
1
2
α
)
-
sin
α
-
d
r
-
e
s
2
ρ
(
s
+
r
)
cos
α
=
0
,
wherein s is a distance between a neutral surface of the flexible conductive layer in a bent state and an unbent state, α is an included angle between two adjacent energy storage elements on two sides of a bending position in the bent state of the flexible conductive layer, and ρ is a local bending radius of the flexible conductive layer.
12 . A display apparatus, comprising a display substrate; and a flexible battery on a side of the display substrate, wherein the flexible battery comprises:
a supporting layer;
a flexible conductive layer on a side of the supporting layer;
a plurality of energy storage elements, arranged at intervals in a first direction on a side of the flexible conductive layer away from the supporting layer, and electrically connected to the flexible conductive layer; and
a first package structure, comprising a protruding portion covering the energy storage elements and a recessed portion between the adjacent energy storage elements, wherein an elastic modulus of the first package structure ranges from 30 MPa to 100 MPa.
13 . The display apparatus according to claim 12 , further comprising:
a casing on a side of the flexible battery away from the display substrate, and on a side of the first package structure away from the supporting layer.
14 . The display apparatus according to claim 13 , wherein the casing is provided with a plurality of first recesses accommodating the protruding portion of the first package structure.
15 . The display apparatus according to claim 13 , comprising a plurality of flexible batteries on one side of the display substrate, wherein the plurality of flexible batteries are on a same plane, and the plurality of flexible batteries are electrically connected to each other by means of a flexible circuit board.
16 . The display apparatus according to claim 15 , wherein the casing is further provided with a second recess, and an orthographic projection of the second recess on the display substrate covers an area between two adjacent flexible batteries; and
the display apparatus further comprises:
a main board, electrically connected to the flexible circuit board, and located in the second recess.
17 . The display apparatus according to claim 16 , wherein two side surfaces of the second recess parallel to the first direction are provided with a first opening and a second opening respectively;
the first opening exposes a startup button of the main board; and
the second opening exposes a charging end of the main board.
18 . A wearable device, comprising a flexible battery on one side of a display substrate, wherein the flexible battery comprises:
a supporting layer;
a flexible conductive layer on a side of the supporting layer;
a plurality of energy storage elements, arranged at intervals in a first direction on a side of the flexible conductive layer away from the supporting layer, and electrically connected to the flexible conductive layer; and
a first package structure, comprising a protruding portion covering the energy storage elements and a recessed portion between the adjacent energy storage elements, wherein an elastic modulus of the first package structure ranges from 30 MPa to 100 MPa.