Battery and electrical apparatus

Patent metadata

Field	Value
Publication number	US-2026018605-A1
Application number	US-202519332015-A
Country	US
Kind code	A1
Filing date	Sep 17, 2025
Priority date	Apr 7, 2024
Publication date	Jan 15, 2026
Grant date	—

Abstract

The present application provides a battery and an electrical apparatus. The battery comprises a case, an electrode assembly and an electrolyte solution. The case is provided with an accommodating cavity inside, and the electrode assembly and the electrolyte solution are both arranged within the accommodating cavity. The electrode assembly comprises a positive electrode plate comprising a positive electrode current collector and a positive electrode active layer located on at least one surface of the positive electrode current collector. The positive electrode active layer comprises a positive electrode active material having a chemical formula of Li x (Ni a Co b Mn c ) 1−a M a O 2−y A y ; the K EL of the battery satisfies 1.6 g/Ah≤K EL ≤1.9 g/Ah, K EL represents the ratio of the mass of free electrolyte solution to the rated capacity of the battery, in units of g/Ah; and the space utilization rate η of the battery is ≥0.8.

First claim

What is claimed is:

1 . A battery, comprising a case, an electrode assembly and an electrolyte solution; wherein the case has an accommodating cavity inside, and the electrode assembly and the electrolyte solution are both arranged in the accommodating cavity;
the electrode assembly comprises a positive electrode plate, the positive electrode plate comprises a positive electrode current collector and a positive electrode active layer located on at least one surface of the positive electrode current collector; the positive electrode active layer comprises a positive electrode active material having a chemical formula of Li x (Ni a Co b Mn c ) 1−a M d O 2−y A y , wherein 0.25≤x≤1.2, 0.6≤a≤1, 0<b≤0.2, 0<c≤0.4, 0≤d<1, 0≤y<2, M comprises at least one of Al, Mg, Fe, Cu, V, Ti, Zr, W, Sb, Dy and Te, and A comprises at least one of P, S and a halogen element; K EL of the battery satisfies 1.6 g/Ah≤K EL ≤1.9 g/Ah, wherein K EL represents a ratio of a mass of free electrolyte solution to a rated capacity of the battery, in units of g/Ah; a space utilization rate η of the battery is ≥0.8, and a space utilization rate represents a ratio of a volume of the electrode assembly to a volume of the accommodating cavity.

2 . The battery according to claim 1 , wherein the electrode assembly further comprises a negative electrode plate, which comprises a negative electrode current collector and a negative electrode active layer located on at least one surface of the negative electrode current collector; wherein 1≤k≤1.15, and k represents a ratio of a projected area of the negative electrode active layer on the negative electrode current collector to a projected area of the positive electrode active layer on the positive electrode current collector.

3 . The battery according to claim 2 , wherein an areal density of the negative electrode active layer is 0.12 g/1540.25 mm 2 to 0.2 g/1540.25 mm 2 .

4 . The battery according to claim 2 , wherein a thickness of the negative electrode current collector is 4 μm to 8 μm.

5 . The battery according to claim 1 , wherein 0.81≤n≤0.9.

6 . The battery according to claim 1 , wherein a thickness of the positive electrode current collector is 9 μm to 15 μm.

7 . The battery according to claim 1 , wherein an areal density of the positive electrode active layer is 0.21 g/1540.25 mm 2 to 0.32 g/1540.25 mm 2 .

8 . The battery according to claim 1 , wherein a compacted density of the positive electrode plate is 3.2 g/cm 3 to 3.7 g/cm 3 .

9 . The battery according to claim 1 , wherein the positive electrode active material comprises single crystal particles.

10 . The battery according to claim 9 , wherein the single crystal particles comprise first single crystal particles and second single crystal particles, and the particle size of the first single crystal particles is smaller than the particle size of the second single crystal particles.

11 . The battery according to claim 10 , wherein a particle size ratio of the first single crystal particles to the second single crystal particles is (0.1-0.5):1.

12 . The battery according to claim 1 , wherein the positive electrode plate further comprises a primer layer; the primer layer is located between the positive electrode active layer and the positive electrode current collector, and the primer layer comprises a conductive agent.

13 . The battery according to claim 12 , wherein a thickness of the primer layer is 0.5 μm to 2 μm.

14 . The battery according to claim 12 , wherein a mass percentage of the conductive agent in the primer layer is 40% to 60%.

15 . The battery according to claim 12 , wherein the conductive agent comprises at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

16 . The battery according to claim 1 , wherein the electrolyte solution comprises a lithium salt, and the lithium salt comprises at least one of lithium hexafluorophosphate, lithium bis(fluorosulfonyl)imide, and lithium difluoro bis(oxalato) phosphate.

17 . The battery according to claim 16 , wherein a molar concentration of the lithium salt in the electrolyte solution is 1.1 mol/L to 1.5 mol/L.

18 . The battery according to claim 1 , wherein the electrolyte solution comprises an additive, and the additive comprises at least one of lithium bis(fluorosulfonyl)imide, lithium difluoro bis(oxalato) phosphate and fluoroethylene carbonate.

19 . An electrical apparatus, comprising the battery according to claim 1 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Wu Kai
• Zhong Ming
• Jin Chao
• Wu Zirui
• Yan Guanfusheng

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title