Sekundärbatterie und Elektrische Vorrichtung

Details

Veröffentlichungs-Nr.

EP4787454

Anmeldetag

24. Mai 2024

Veröffentlichung

5. Juni 2025

Rechtsraum

EP

Abstract

A secondary battery and an electric device. The secondary battery comprises a negative electrode sheet. The negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector, wherein the negative electrode film layer has a first surface away from the negative electrode current collector and a second surface arranged opposite the first surface; the thickness of the negative electrode film layer is denoted as H; a region within a thickness range from the second surface of the negative electrode film layer to 0.3H is denoted as a first region of the negative electrode film layer, and a region within a thickness range from the first surface of the negative electrode film layer to 0.3H is denoted as a second region of the negative electrode film layer; the first region comprises a first active material, and the second region comprises a second active material; the first active material comprises a first carbon-based material, and the second active material comprises a second carbon-based material; the first carbon-based material comprises an external region and an internal region located on an inner side of the external region, and the external region is a region extending a distance of 2.5 µm from the surface to the interior of particles of the first carbon-based material; in the cross-sectional view of the first carbon-based material, the total pore area of the external region is denoted as S1, the total pore area of the internal region is denoted as S2, and S2 is greater than S1; and the second carbon-based material includes an amorphous carbon material.

Anmelder

Firma

Contemporary Amperex Technology Co., Limited

Land

🇨🇳 China