Battery cell, battery, and power consuming device

Patent metadata

Field	Value
Publication number	US-2026031442-A1
Application number	US-202519346861-A
Country	US
Kind code	A1
Filing date	Oct 1, 2025
Priority date	Nov 17, 2023
Publication date	Jan 29, 2026
Grant date	—

Abstract

Embodiments of the present application disclose a battery cell, a battery, and a power consuming device. The battery cell includes an electrode assembly, a first electrode terminal, and a case. The electrode assembly includes a first tab. The case includes a barrel and a cover connected to the barrel. The barrel is disposed around an outer periphery of the electrode assembly. The cover includes the first electrode terminal. The first tab is electrically connected to the first electrode terminal by using the barrel. The case is of a multi-layer structure. The multi-layer structure has different resistivity.

First claim

What is claimed is:

1 . A battery cell, comprising:
an electrode assembly, wherein the electrode assembly comprises a first tab; a first electrode terminal; and a case, wherein the case comprises a barrel and a cover connected to the barrel, the barrel is disposed around an outer periphery of the electrode assembly, the cover comprises the first electrode terminal, the first tab is electrically connected to the first electrode terminal by using the barrel, the case is of a multi-layer structure, and the multi-layer structure has different resistivity.

2 . The battery cell according to claim 1 , wherein the case comprises a first case layer, the first case layer has a resistivity of K 1 , and K 1 satisfies: 1×10{circumflex over ( )}-8 Ω·m≤K 1 ≤6×10{circumflex over ( )}-8 Ω·m.

3 . The battery cell according to claim 2 , wherein an average thickness of the first case layer is T 13 , an average thickness of the case is T 10 , and T 13 and T 10 satisfy: 0.15≤T 13 /T 10 ≤0.85.

4 . The battery cell according to claim 2 , wherein a material of the first case layer comprises at least one of the following: silver, copper, aluminum, magnesium, and brass.

5 . The battery cell according to claim 2 , wherein the case comprises a second case layer, the second case layer has a tensile strength of Rm 2 at a temperature of 25° C., and Rm 2 satisfies: 250 MPa≤Rm 2 ≤2000 MPa.

6 . The battery cell according to claim 5 , wherein an average thickness of the second case layer is T 14 , an average thickness of the case is T 10 , and T 14 and T 10 satisfy: 0.15≤T 14 /T 10 ≤0.85.

7 . The battery cell according to claim 5 , wherein the second case layer has a resistivity of K 2 , and K 2 and K 1 satisfy: 2≤K 2 /K 1 ≤40.

8 . The battery cell according to claim 5 , wherein a material of the second case layer comprises at least one of the following: titanium, steel, silicon steel, and stainless steel.

9 . The battery cell according to claim 5 , wherein the case comprises a plurality of first case layers and/or a plurality of second case layers.

10 . The battery cell according to claim 1 , wherein the electrode assembly further comprises a second tab, the second tab and the first tab have opposite polarity, and the first tab and the second tab are located on different end faces of the electrode assembly.

11 . The battery cell according to claim 10 , wherein the first tab and the second tab are respectively located on opposite end faces of the electrode assembly.

12 . The battery cell according to claim 10 , comprising:
a second electrode terminal, wherein the second electrode terminal is electrically connected to the second tab, and the first electrode terminal and the second electrode terminal are located on a same wall of the battery cell.

13 . The battery cell according to claim 12 , wherein the cover is the first electrode terminal, the cover is provided with an electrode lead-out hole, the second electrode terminal is insulated from the cover and is mounted in the electrode lead-out hole, one of the cover and the second electrode terminal is a positive output electrode of the battery cell, and the other is a negative output electrode of the battery cell.

14 . The battery cell according to claim 1 , wherein the cover and the barrel are of an integrally formed structure.

15 . The battery cell according to claim 1 , wherein the electrode assembly comprises a negative electrode plate, the negative electrode plate comprises a negative electrode active material with a metal ion reversely deintercalated and intercalated, and the negative electrode active material comprises a silicon-based material; and
at least a portion of regions of the case has a yield strength of Re at a temperature of 25° C., and Re satisfies: 140 MPa≤Re≤1000 MPa.

16 . The battery cell according to claim 1 , wherein the electrode assembly comprises a first tab, the case comprises a barrel and a cover connected to the barrel, the barrel is disposed around an outer periphery of the electrode assembly, the cover comprises a first electrode terminal, the first tab is electrically connected to the first electrode terminal by using the barrel, the case is of a multi-layer structure, and the multi-layer structure has different resistivity.

17 . The battery cell according to claim 1 , wherein the case has an opening, the case comprises a first case wall opposite to the opening and at least two second case walls, and the first case wall and the second case walls intersect with each other; and
a transition region is provided between two adjacent second case walls in the at least two second case walls, and a maximum thickness T 1 of the transition region and a maximum thickness T 0 of a thicker second case wall in the two second case walls satisfy: T 1 >T 0 .

18 . The battery cell according to claim 1 , wherein a material of an outermost case of the case comprises at least one of the following: aluminum, an aluminum alloy, copper, a copper alloy, and chromium.

19 . A battery, comprising:
a plurality of battery cells comprising the battery cell according to claim 1 .

20 . A power consuming device, comprising:
a battery, wherein the battery comprises the battery cell according to claim 1 , and the battery is configured to supply power to the power consuming device.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Chen Xinxiang
• Li Can
• Huang Shoujun
• Lin Denghua
• Zheng Yulian
• Wang Peng
• Jin Haizu

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/545

  formed by the casing of the cells (cup shaped terminals adapted for cells having curved cross-section H01M50/56) · CPC title

• H01M50/133

  Thickness · CPC title