US 2026/0312150 A1Published application

Battery cell and battery

AssigneeZhuhai Cosmx Battery Co., Ltd.

InventorsXiaodong Cao, Fei He, Suli Li

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Abstract

The disclosure provides a lithium-ion battery that satisfies the equation (2M+3)2 (S+2)2/W≥20, where M=exp(m1/d1)+(d1−2)(m1−0.26). Wherein, m1 is the tensile strength of the negative electrode current collector in the length direction, and d1 is the thickness of the negative electrode current collector. Additionally, S=exp(m2/d2)+(d2−2)(m2−0.16), wherein m2 is the puncture strength of the separator, and d2 is the thickness of the substrate within the separator. Furthermore, W=(((exp(−10q))/(φ−6)+exp(10q))(d3−13.5)(ρ−3.5))/100. This disclosure effectively addresses the issue of pressure exerted on the battery casing due to volume swelling of the negative electrode material, thereby significantly enhancing the battery's cycle life and safety performance.

Claims14

Dependent claims

A lithium-ion battery, comprising;

a negative electrode plate;
and
a separator comprising a substrate, wherein
the negative electrode plate comprises a negative current collector and a negative active layer disposed on at least one functional surface of the negative current collector, and the negative active layer comprises a negative active material, wherein the negative active material comprises a silicon-based negative electrode material;
wherein the lithium-ion battery satisfies the following formula 1:
5
⁢
0
≤
(
2
⁢
M
+
3
)
2
⁢
(
S
+
2
)
2
/
W
≤
1
⁢
0
⁢
2
Formula
⁢
1
in Formula 1,
M
=
exp
⁡
(
m
1
/
d
1
)
+
(
d
1
-
2
)
⁢
(
m
1
-
0.26
)
,
wherein
m1 is a tensile strength of the negative current collector in a length direction, measured in GPa;
d1 is a thickness of the negative current collector, measured in μm;
S
=
exp
⁡
(
m
2
/
d
2
)
+
(
d
2
-
2
)
⁢
(
m
2
-
0
.
1
⁢
6
)
,
wherein
m2 is a puncture strength of the separator, measured in kgf, and
d2 is a thickness of the substrate in the separator, measured in μm;
W
=
(
(
exp
⁡
(
-
10
⁢
q
)
)
/
(
φ
-
6
)
+
exp
⁡
(
10
⁢
q
)
)
⁢
(
d
3
-
13.5
)
⁢
(
ρ
-
3.5
)
/
100
,
wherein
d3 is a thickness of the negative active layer, measured in μm;
φ is an OI value of the negative active layer;
q is a mass percentage of the silicon-based negative electrode material in the negative active material;
and
ρ is a areal density of the negative active layer, measured in μmg/cm2,
wherein W ranges from 3.03 to 40.

146 more elements

Dependencies are inferred from the claim text.

Facts

Application: 19/716,136Filed 23 Jun 2026
Priority: CN 202410850064.427 Jun 2024
Published: 8 Oct 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01M 10/4235
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: safety or regulating additives or arrangements in…
H01M 10/0525
Li-accumulators: rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H01M 50/434
Inorganic material: ceramics
H01M 50/451
Having a layered structure: comprising layers of only organic material and layers containing inorganic material