CN-121986414-A - Battery cell, battery device, electricity utilization device, electrode assembly and preparation method thereof

CN121986414ACN 121986414 ACN121986414 ACN 121986414ACN-121986414-A

Abstract

A battery monomer, a battery device, an electricity utilization device, an electrode assembly and a preparation method thereof belong to the technical field of batteries. The battery cell includes a housing and an electrode assembly received in the housing, the electrode assembly including a first pole piece, a second pole piece, a solid electrolyte layer, and an insulator. The first pole piece comprises a first active material area and a first pole lug, and the first pole lug protrudes out of the first active material area. The second pole piece and the polarity of first pole piece are opposite, and the second pole piece includes main body district and surpasses the district of first active material district, and main body district and first active material district range upon range of setting along first direction. At least a portion of the solid electrolyte layer is disposed between the first and second pole pieces along the first direction. An insulator is disposed at an edge region of the first active material region, the insulator configured to insulate the excess region from the first active material region. The risk of overlapping the excess region with the first active material region is reduced, and the reliability of the battery cell is improved.

Inventors

WU KAI
WANG WEIWEI
ZHU WENQI
SUN XIAOYU
CHENG YUN

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20240815

Claims (20)

A battery cell comprising: a housing; an electrode assembly accommodated in the case, the electrode assembly comprising: The first pole piece comprises a first active material area and a first pole lug, and the first pole lug protrudes out of the first active material area; the second pole piece is opposite to the first pole piece in polarity, the second pole piece comprises a main body area and an exceeding area exceeding the first active material area, and the main body area and the first active material area are stacked along a first direction; A solid electrolyte layer, at least a portion of which is disposed between the first pole piece and the second pole piece along the first direction; And an insulating member disposed at an edge region of the first active material region, the insulating member configured to insulate the excess region from the first active material region.
The battery cell of claim 1, wherein, in the first direction, the first active material region has a first surface facing the body region, at least a portion of the excess region is located on a side of the first surface facing away from the body region, and at least a portion of the insulator is located between the excess region and the first active material region.
The battery cell according to claim 1 or 2, wherein the solid electrolyte layer includes a first portion and a second portion, the first portion being disposed offset from the second portion in the first direction, the first portion being disposed between the body region and the first active material region, the second portion being disposed in a stack with the excess region; in the first direction, the first active material region has a first surface facing the body region, at least part of the second portion is located on a side of the first surface facing away from the body region, and at least part of the insulator is located between the second portion and the first active material region.
A battery cell according to any one of claims 1-3, wherein at least part of the insulator is located between the first active material region and the body region in the first direction.
The battery cell according to claim 4, wherein a portion of the insulating member between the first active material region and the body region is connected to a side of the first active material region facing the body region in the first direction.
The battery cell according to any one of claims 1 to 5, wherein at least one end of the body region in a second direction is provided with the excess region, and an end of the first active material region in the second direction near the excess region is provided with the insulating member, the second direction being perpendicular to the first direction.
The battery cell of claim 6, wherein the second pole piece is disposed on both sides of the first pole piece in the first direction; The end part, close to the exceeding area, of the first active material area along the second direction is provided with two insulating parts, and the insulating part arranged at least one end part of the first active material area along the second direction comprises a first insulating part, a second insulating part and a third insulating part which are sequentially connected; At least part of the first insulating part is arranged between the first active material area and the main body area along the first direction, at least part of the third insulating part is arranged between the exceeding areas of the two adjacent second pole pieces, and at least part of the second insulating part is arranged between the first active material area and the exceeding areas along the second direction.
The battery cell according to claim 7, wherein the first insulating portions of two of the insulating members are respectively connected to opposite sides of the first active material region in the first direction.
The battery cell according to claim 7 or 8, wherein the third insulating portions of two of the insulating members provided at least one end portion of the first active material region in the second direction are connected to each other.
The battery cell according to any one of claims 7 to 9, wherein at least one end of the first active material region is provided with the first tab in the second direction; In the insulating member disposed at an end portion of the first active material region near the first tab in the second direction, at least a portion of the third insulating portion is located between the first tab and the excess region in the first direction.
The battery cell of any one of claims 7-10, wherein the third insulating portion extends beyond an end of the excess region facing away from the body region in the second direction.
The battery cell of claim 6, wherein the second pole piece is disposed on both sides of the first pole piece in the first direction; The insulating member provided at least one end portion of the first active material region in the second direction includes a second insulating portion and two first insulating portions, the second insulating portion connecting the two first insulating portions; at least part of one first insulating part is arranged between the first active material area and the main body area of one second pole piece along the first direction, at least part of the other first insulating part is arranged between the first active material area and the main body area of the other second pole piece, and at least part of the second insulating part is arranged between the first active material area and the exceeding area along the second direction.
The battery cell according to claim 12, wherein two of the first insulating portions are connected to opposite sides of the first active material region, respectively, in the first direction.
The battery cell of any one of claims 7-13, wherein the first insulating portion has a dimension L 1 ,0.1mm≤L 1 -10 mm, optionally 2 mm-L 1 -8 mm, in the second direction.
The battery cell according to any one of claims 6 to 14, wherein both ends of the body region opposite in the second direction are provided with an excess region, and both ends of the first active material region opposite in the second direction are provided with the insulating member.
The battery cell according to any one of claims 6 to 15, wherein at least one end of the body region in a third direction is provided with the excess region, an end of the first active material region in the third direction near the excess region is provided with the insulating member, and both the first direction and the second direction are perpendicular to the third direction.
The battery cell as defined in claim 16, wherein the second pole piece is disposed on both sides of the first pole piece in the first direction; The end part, close to the exceeding area, of the first active material area along the third direction is provided with two insulating parts, and the insulating part arranged at least one end part of the first active material area along the third direction comprises a fourth insulating part, a fifth insulating part and a sixth insulating part which are sequentially connected; At least part of the fourth insulating part is arranged between the first active material area and the main body area along the first direction, at least part of the sixth insulating part is arranged between the exceeding areas of the two adjacent second pole pieces, and at least part of the fifth insulating part is arranged between the first active material area and the exceeding areas along the third direction.
The battery cell according to claim 17, wherein the first active material region has two opposite first surfaces in the first direction, and the fourth insulating portions of two of the insulating members are respectively connected to opposite sides of the first active material region.
The battery cell according to claim 17 or 18, wherein the sixth insulating portions of the two insulating members provided at least one end portion of the first active material region in the third direction are connected to each other.
The battery cell of any one of claims 17-19, wherein the sixth insulating portion extends beyond an end of the excess region facing away from the body region in the third direction.

Description

Battery cell, battery device, electricity utilization device, electrode assembly and preparation method thereof Technical Field The application relates to the technical field of batteries, in particular to a battery monomer, a battery device, an electric device, an electrode assembly and a preparation method thereof. Background In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, power batteries have an important role as a power source for electric automobiles. With the great popularization of new energy automobiles, the demand for power battery products is also increasing. As the demand of batteries increases, higher demands are being placed on the reliability of the battery cells. Therefore, how to improve the reliability of the battery cell is a problem to be solved in the battery technology. Disclosure of Invention The embodiment of the application provides a battery monomer, a battery device, an electricity utilization device, an electrode assembly and a preparation method thereof, which can effectively improve the reliability of the battery monomer. In a first aspect, embodiments of the present application provide a battery cell, including a case and an electrode assembly, the electrode assembly being accommodated in the case, the electrode assembly including a first electrode sheet including a first active material region and a first tab protruding from the first active material region, a second electrode sheet opposite in polarity to the first electrode sheet including a body region and an excess region exceeding the first active material region, the body region and the first active material region being stacked in a first direction, at least a portion of the solid electrolyte layer being disposed between the first electrode sheet and the second electrode sheet in the first direction, and an insulating member disposed at an edge region of the first active material region, the insulating member being configured to insulate the excess region from the first active material region. In the technical scheme, the insulating piece is arranged in the edge area of the first active material area, the exceeding area of the second pole piece can be insulated and isolated from the first active material area of the first pole piece by the insulating piece, the risk of lap joint of the exceeding area and the first active material area is reduced, the risk of short circuit between the first pole piece and the second pole piece is reduced, and the reliability of the battery monomer is improved. In some embodiments, the first active material region has a first surface facing the body region in the first direction, at least a portion of the excess region being located on a side of the first surface facing away from the body region, and at least a portion of the insulator being located between the excess region and the first active material region. At least part of the excess region is positioned on one side of the first surface, which is away from the main body region, so that the excess region plays a certain role in protecting the first active material region, and the risk of damaging the first active material region is reduced. At least part of the insulating member is positioned between the exceeding area and the first active material area, so that the risk of overlapping the exceeding area and the first active material area can be effectively reduced. In some embodiments, the solid state electrolyte layer includes a first portion disposed offset from a second portion along a first direction, the first portion disposed between the body region and the first active material region, and the second portion disposed in a stack with the excess region, the first active material region having a first surface facing the body region along the first direction, at least a portion of the second portion being located on a side of the first surface facing away from the body region, and at least a portion of the insulator being located between the second portion and the first active material region. The second portion of the solid electrolyte layer is disposed in a layered relationship with the excess region, and the solid electrolyte layer is capable of covering a portion of the surface of the excess region, reducing the risk of overlap of the excess region with the first active material region. At least part of the second portion is located on a side of the first surface facing away from the body region, and at least part of the insulating member is located between the second portion and the first active material region, such that the insulating member is able to cover more of the side surface of the first active material region to which the first surface is connected, reducing the risk of overlap of the excess region with the side surface of the first active material region. In some embodiments, at least a portion of the insulator is located between the first active