Natrium-Ionen-Batteriezelle, Sekundärbatterie und Elektrische Vorrichtung

Details

Veröffentlichungs-Nr.

EP4773228

Anmeldetag

29. Mai 2024

Veröffentlichung

15. Mai 2025

Rechtsraum

EP

Abstract

A sodium-ion battery cell, a secondary battery, and an electric device. The sodium-ion battery cell comprises an electrode assembly and a casing, wherein the casing is cylindrical; an accommodating cavity is provided inside the casing; and the electrode assembly is located inside the accommodating cavity. The electrode assembly comprises a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode active layer located on at least one surface of the negative electrode current collector, the density of the negative electrode current collector being less than or equal to 5.0 g/cm³. The group margin of the sodium-ion battery cell satisfies: 0.95 ≤ group margin < 1, where the group margin is the ratio of the diameter of the electrode assembly to the diameter of the accommodating cavity. The sodium-ion battery cell uses the negative electrode current collector having a relatively low density, combined with a relatively large group margin, and uses a cylindrical structure, such that the battery cell can achieve a relatively high gravimetric energy density, a relatively high volumetric energy density and relatively good cycling performance, thus being conducive to prompting the development of miniaturization and weight reduction of the battery cell.

Anmelder

Firma

Contemporary Amperex Technology Co., Limited

Land

🇨🇳 China