Battery cell, battery, electric apparatus, and energy storage apparatus

Patent metadata

Field	Value
Publication number	US-12555871-B2
Application number	US-202519291617-A
Country	US
Kind code	B2
Filing date	Aug 6, 2025
Priority date	Jun 21, 2023
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

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 positioned within the housing. The housing is a right parallelepiped defined by three mutually perpendicular dimensions: W 1 , T 1 , and H 1 . The housing comprises six walls, arranged in opposite pairs along each direction. The combined thicknesses of the two opposite walls in each direction are denoted as a, b, and c, respectively. The ratio of usable internal volume to total external volume, defined as (W 1 −a)·(T 1 −b)·(H 1 −c)/(W 1 ·T 1 ·H 1 ), is not less than 90%. This structural configuration increases the volumetric energy density of the battery cell using the same chemical system.

First claim

What is claimed is:

1 . A battery cell, a housing thereof having a volume greater than or equal to 3000 cm 3 , the housing being a right parallelepiped, the housing comprising a housing body and two end caps, the housing body comprising a first wall, a second wall, a third wall, and a fourth wall integrally formed, the first wall and the second wall being disposed opposite each other along a first direction, the third wall and the fourth wall being disposed opposite each other along a second direction, the housing body having two openings disposed opposite each other along a third direction, each of the two end caps covering the opening on a corresponding side, each end cap being welded to the housing body, and the first direction, the second direction, and the third direction being mutually perpendicular, wherein the battery cell comprises:
electrode terminals disposed on the end caps; 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, and the tabs being electrically connected to the electrode terminals; a third insulating member and a fourth insulating member, the third insulating member being disposed between one of the end caps and the electrode assembly and abutting against the one of the end caps, and the fourth insulating member being disposed between the other of the end caps and the electrode assembly and abutting against the other of the end caps; and an electrolyte, wherein the electrolyte is accommodated within the housing; and, wherein a size of the housing in the first direction is denoted as W 1 , a size of the housing in the second direction is denoted as T 1 , a size of the housing in the third direction is denoted as H 1 , a sum of thicknesses of the first wall and the second wall is denoted as a, a sum of thicknesses of the third wall and the fourth wall is denoted as b, and a sum of thicknesses of the two end caps is denoted as c, satisfying: (W 1 −a)*(T 1 −b)*(H 1 −c)/(W 1 *T 1 *H 1 )≥90%, 40 mm≤T 1 ≤150 mm, 120 mm≤H 1 ≤400 mm, and 150 mm≤W 1 ≤1500 mm, wherein the thickness of the first wall and the thickness of the second wall are both denoted as a 1 , the thickness of the third wall and the thickness of the fourth wall are both denoted as b 1 , and the thicknesses of the two end caps are respectively denoted as c 1 and c 2 , satisfying: c 1 >a 1 , and c 1 >b 1 , 0.5 mm≤a 1 ≤1.5 mm, 0.8 mm≤b 1 ≤1.5 mm, and 1.5 mm≤c 2 ≤4 mm, wherein a maximum size of the third insulating member in the third direction is denoted as d 3 , and a maximum size of the fourth insulating member in the third direction is denoted as d 4 , satisfying: 2 mm≤d 3 <10 mm, and 2 mm≤d 4 ≤10 mm.

2 . The battery cell according to claim 1 , wherein (W 1 −a)*(T 1 −b)*(H 1 −c)/(W 1 *T*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
d 3 and d 4 satisfy: (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%.

5 . The battery cell according to claim 1 , wherein
d 3 and d 4 satisfy: (W 1 −a−4 mm)*(T 1 −b−4 mm)*(H 1 −c−d 3 −d 4 )/(W 1 *T 1 *H 1 )≥85%, the third insulating member and the fourth insulating member are plastic pieces.

6 . The battery cell according to claim 1 , wherein 400 mm≤W 1 ≤1500 mm, W 1 *T 1 *H 1 ≤40000 cm 3 .

7 . The battery cell according to claim 6 , wherein 3200 cm 3 ≤W 1 *T 1 *H 1 ≤32000 cm 3 .

8 . The battery cell according to claim 7 , wherein 3720 cm 3 ≤W 1 *T 1 *H 1 ≤12500 cm 3 .

9 . The battery cell according to claim 8 , wherein 4000 cm 3 ≤W 1 *T 1 *H 1 ≤6000 cm 3 .

10 . The battery cell according to claim 1 , wherein the body is a flat body; and
one electrode assembly is provided, a maximum size of the body in the first direction is denoted as W 2 , a maximum size of the body in the second direction is denoted as T 2 , and a maximum size of the body in the third direction is denoted as 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 . The battery cell according to claim 1 , wherein materials of the first wall, the second wall, the third wall, the fourth wall, and the end caps all comprise an aluminum alloy, the aluminum alloy comprising components in the following mass percentages: aluminum≥96.7%, 0.05%≤copper≤0.2%, iron≤0.7%, manganese≤1.5%, silicon≤0.6%, zinc≤0.1%, any other single element component≤0.05%, and a total of other element components≤0.15%.

14 . The battery cell according to claim 1 , wherein (W 1 −2*a 1 )*(T 1 −2*b 1 )*(H 1 −2*c 1 )/(W 1 *T 1 *H 1 )≥95% is satisfied.

15 . The battery cell according to claim 1 , wherein T 1 <W 1 , and T 1 <H 1 , and 2≤W 1 /T 1 ≤10, 2≤H 1 /T 1 ≤10, and/or 0.7≤W 1 /H 1 ≤1.6.

16 . The battery cell according to claim 1 , wherein a positive electrode material of the battery cell comprises lithium-containing phosphate, and a capacity of the battery cell is denoted as C, satisfying: C≥350 Ah, and C/((W 1 −a)*(T 1 −b)*(H 1 −c))≥118 Ah/L.

17 . The battery cell according to claim 1 , wherein a positive electrode material of the battery cell comprises lithium transition metal oxide, and a capacity of the battery cell is denoted as C, satisfying: C≥650 Ah, and C/((W 1 −a)*(T 1 −b)*(H 1 −c))≥190 Ah/L.

18 . The battery cell according to claim 1 , wherein the battery cell is a sodium-ion battery, and a capacity of the battery cell is denoted as C, satisfying: C≥260 Ah, and C/((W 1 −a)*(T 1 −b)*(H 1 −c))≥87 Ah/L.

19 . A battery, characterized by comprising the battery cell according to claim 1 .

20 . An electric apparatus comprising the battery according to claim 19 , wherein the battery is configured to provide electric energy to the electric apparatus.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Jin Haizu
• Liu Heyang
• Liu Jiang
• Yang Limei
• Yang Rui

Classifications

• H01M50/103 Primary

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/233 Primary

  characterised by physical properties of casings or racks, e.g. dimensions · CPC title

• H01M50/209

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M50/133

  Thickness · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title