WO-2026091449-A1 - BATTERY CELL, BATTERY DEVICE , AND ELECTRIC DEVICE

WO2026091449A1WO 2026091449 A1WO2026091449 A1WO 2026091449A1WO-2026091449-A1

Abstract

Provided in the present application are a battery cell, a battery device, and an electric device. The battery cell comprises a housing and an electrode assembly. The electrode assembly is accommodated in the housing, and comprises a first electrode sheet, a solid electrolyte layer, and a second electrode sheet that are sequentially stacked. The first electrode sheet and the second electrode sheet have opposite polarities. The first electrode sheet comprises a first current collector and a first active material layer, the first active material layer being disposed on the side of the first current collector facing the solid electrolyte layer. The electrode assembly further includes a first hybrid layer disposed between the first active material layer and the solid electrolyte layer. The first hybrid layer comprises a first portion made of the same material as the first active material layer and a second portion made of the same material as the solid electrolyte layer. The first portion is connected to the first active material layer, the second portion is connected to the solid electrolyte layer, and the first portion and the second portion are interlocked with each other. The first hybrid layer can improve the charging and discharging capability of the battery cell.

Inventors

CHEN, WEI
LIANG, Shengxing
CHE, Huan
HU, Bobing
SUN, XIAOYU
CHENG, YUN
WU, KAI

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260507
Application Date: 20250507
Priority Date: 20241028

Claims (20)

A single battery cell, comprising: shell; An electrode assembly is housed within the housing. The electrode assembly includes a first electrode, a solid electrolyte layer, and a second electrode stacked together. The first electrode and the second electrode have opposite polarities. At least a portion of the solid electrolyte layer is disposed between the first electrode and the second electrode. The first electrode includes a first current collector and a first active material layer. The first active material layer is disposed on the side of the first current collector facing the solid electrolyte layer. The electrode assembly further includes a first mixing layer disposed between the first active material layer and the solid electrolyte layer. The first mixing layer includes a first part made of the same material as the first active material layer and a second part made of the same material as the solid electrolyte layer. The first part is connected to the first active material layer, and the second part is connected to the solid electrolyte layer. The first part and the second part are interlocked with each other.
The battery cell as described in claim 1, wherein the thickness of the first hybrid layer is 0.5 μm-10 μm.
The battery cell as described in claim 1 or 2, wherein the first portion is connected to the solid electrolyte layer; and/or, the second portion is connected to the first active material layer.
The battery cell according to any one of claims 1-3, wherein, along the thickness direction of the solid electrolyte layer, the second portion has a first surface and a second surface disposed opposite to each other; The second part is provided with a first through hole, the two ends of the first through hole extending to the first surface and the second surface respectively, and the first part includes a first fitting part, at least a portion of the first fitting part being fitted into the first through hole.
The battery cell as described in claim 4, wherein the first fitting portion is entirely embedded within the first through hole.
The battery cell as described in claim 4 or 5, wherein there are multiple first through holes, and the multiple first through holes are spaced apart; There are multiple first fitting parts, and each first fitting part corresponds to a first through hole.
The battery cell according to any one of claims 1-6, wherein, within the cross-section of the same first hybrid layer, the cross-sectional area of the first portion is S1 , the cross-sectional area of the second portion is S2 , 0.05≤S1 /( S1 + S2 )≤0.95, and the cross-section of the first hybrid layer is perpendicular to the thickness direction of the solid electrolyte layer.
The battery cell as described in claim 7, wherein 0.2 ≤ S 1 / (S 1 + S 2 ) ≤ 0.6.
The battery cell according to any one of claims 1-8, wherein the first portion is integrally formed with the first active material layer; and/or, the second portion is integrally formed with the solid electrolyte layer.
The battery cell according to any one of claims 1-9, wherein the thickness of the solid electrolyte layer is greater than or equal to the thickness of the first hybrid layer.
The battery cell according to any one of claims 1-10, wherein the first active material layer is provided on both sides of the first current collector, the first mixed layer is provided between the first active material layer on one side of the first current collector and one of the solid electrolyte layers, and the first mixed layer is provided between the first active material layer on the other side of the first current collector and another of the solid electrolyte layers.
The battery cell according to any one of claims 1-11, wherein the second electrode includes a second current collector and a second active material layer, and the second active material layer is disposed on the side of the second current collector facing the solid electrolyte layer; The electrode assembly further includes a second mixing layer disposed between the second active material layer and the solid electrolyte layer. The second mixing layer includes a third part made of the same material as the second active material layer and a fourth part made of the same material as the solid electrolyte layer. The third part is connected to the second active material layer, and the fourth part is connected to the solid electrolyte layer. The third part and the fourth part are interlocked with each other.
The battery cell of claim 12, wherein the thickness of the second hybrid layer is 0.5 μm-10 μm.
The battery cell as described in claim 12 or 13, wherein the third portion is connected to the solid electrolyte layer; and/or, the fourth portion is connected to the second active material layer.
The battery cell according to any one of claims 12-14, wherein, along the thickness direction of the solid electrolyte layer, the fourth portion has a third surface and a fourth surface disposed opposite to each other; The fourth part is provided with a second through hole, the two ends of which extend to the third surface and the fourth surface respectively. The third part includes a second fitting portion, at least part of which is fitted into the second through hole.
The battery cell as described in claim 15, wherein the second fitting portion is entirely embedded within the second through hole.
The battery cell as described in claim 15 or 16, wherein there are multiple second through holes, and the multiple second through holes are spaced apart; There are multiple second fitting parts, and each second fitting part corresponds to a second through hole.
The battery cell according to any one of claims 12-17, wherein, within the cross-section of the same second hybrid layer, the cross-sectional area of the third portion is S3 , the cross-sectional area of the fourth portion is S4 , 0.05≤S3 /( S3 + S4 )≤0.95, and the cross-section of the second hybrid layer is perpendicular to the thickness direction of the solid electrolyte layer.
The battery cell as described in claim 18, wherein 0.2 ≤ S 3 / (S 3 + S 4 ) ≤ 0.6.
The battery cell according to any one of claims 12-19, wherein the third portion and the second active material layer are integrally formed; and/or, the fourth portion and the solid electrolyte layer are integrally formed.

Description

Battery cells, battery packs and electrical devices Cross-reference of related applications This application claims priority to Chinese patent application 202422611297.7, filed on October 28, 2024, entitled “Battery cell, battery device and power consumption device”, the entire contents of which are incorporated herein by reference. Technical Field This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. A battery device consists of individual battery cells, and the charge/discharge capacity of these cells affects the battery's performance. Therefore, improving the charge/discharge capacity of batteries is a critical technical problem that needs to be solved in battery technology. Summary of the Invention This application provides a battery cell, a battery device, and an electrical device that can improve the charging and discharging capability of the battery cell. In a first aspect, embodiments of this application provide a battery cell, including a casing and an electrode assembly; the electrode assembly is housed within the casing, and includes a first electrode, a solid electrolyte layer, and a second electrode stacked together, the first electrode and the second electrode having opposite polarities, the solid electrolyte layer being disposed between the first electrode and the second electrode, the first electrode including a first current collector and a first active material layer, the first active material layer being disposed on the side of the first current collector facing the solid electrolyte layer; wherein, the electrode assembly further includes a first mixing layer, the first mixing layer being disposed between the first active material layer and the solid electrolyte layer, the first mixing layer including a first portion of the same material as the first active material layer and a second portion of the same material as the solid electrolyte layer, the first portion being connected to the first active material layer, the second portion being connected to the solid electrolyte layer, and the first portion and the second portion being interlocked with each other. In the above technical solution, by setting the first active material layer to be of the same material as the first part and connecting the first active material layer and the first part, the first active material layer can transport ions through the outer surface of the first part. By setting the solid electrolyte layer to be of the same material as the second part and connecting the solid electrolyte layer and the second part, the solid electrolyte layer can transport ions through the outer surface of the second part. By setting the first part and the second part to be interlocked, the outer surfaces of the first part and the second part are in contact, so as to form more ion channels between the outer surfaces of the first part and the second part. This allows more ions to be inserted or extracted between the solid electrolyte layer and the first active material layer, improving the charge and discharge performance of the electrode assembly, thereby improving the charge and discharge capability of the battery cell. In some embodiments, the thickness of the first mixing layer is 0.5 μm-10 μm. When the thickness of the first mixing layer is greater than or equal to 0.5 μm, the first mixing layer can provide more ion channels to the first active material layer and the solid electrolyte layer, which is beneficial to improving the charge and discharge capability of the battery cell. When the thickness of the first mixing layer is less than or equal to 10 μm, the space occupied by the first mixing layer in the electrode assembly can be reduced, which is beneficial to reducing the impact of the first mixing layer on the energy density of the electrode assembly. Therefore, when the thickness of the first mixing layer is 0.5 μm-10 μm, it is possible to balance increasing the ion channels between the first active material layer and the solid electrolyte layer and reducing the impact of the first mixing layer on the energy density of the electrode assembly. In some embodiments, the first portion is connected to the solid electrolyte layer. Thus, the first portion connects the solid electrolyte layer and the first active material layer, providing a stable ion channel to both the first active material layer and the solid electrolyte layer, thereby mak