Patent ID: 11901546
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A secondary battery (5), comprising a negative electrode plate (10), wherein the negative electrode plate (10) comprises a negative electrode current collector (101) and a negative electrode film (102, 103), and the negative electrode film (102, 103) comprises a first negative electrode film (103) and a second negative electrode film (102);
the first negative electrode film (103) is disposed on at least one surface of the negative electrode current collector (101) and comprises a first negative electrode active material;
the second negative electrode film (102) is disposed on the first negative electrode film (103) and comprises a second negative electrode active material;
the first negative electrode active material and the second negative electrode active material both comprise artificial graphite;
the first negative electrode active material comprises primary particles, and a number percentage of the primary particles in the first negative electrode active material A satisfies A≥50%, and
the second negative electrode active material comprises secondary particles, and a number percentage of the secondary particles in the second negative electrode active material B satisfies: B≥30%; and
a volume distribution particle size DV50 of the first negative electrode active material is greater than a volume distribution particle size DV50 of the second negative electrode active material.