Patent ID: 11949091
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A charging method of a non-aqueous electrolyte secondary battery comprising a negative electrode including a carbon material and a silicon compound as a negative electrode active material, comprising:
a first charging step of charging at a first constant current value I1st satisfying an expression described below, when a ratio of a capacity of the silicon compound to a rated capacity Q is x (0.1≤x≤0.5); and
a large current charging step of charging at a constant current value Imax larger than the first constant current value I1st, after an end of the first charging step,
the expression being:

82/(81.8x+64)×(0.3/0.7)−α≤I1st/Imax≤82/(81.8x+64)×(0.3/0.7)+α,

wherein α=0.3, and
wherein the charging method further comprises:
a second charging step of charging at a second constant current value I2nd satisfying an expression described below, between the first charging step and the large current charging step,
the expression being:

36/(122.4x+10.9)×(0.5/0.7)−α≤I2nd/Imax≤36/(122.4x+10.9)×(0.5/0.7)+α.