Negative pole piece, battery, battery pack and electric equipment

• Main Authors: YU TONG, YUAN JIELIN
• Format: Patent
• Language: Chinese; English
• Published: 07.07.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a negative pole piece, a battery, a battery pack and electric equipment. The negative pole piece comprises a negative current collector and a negative material layer, the negative material layer is arranged on the surface of the negative current collector, the negative material layer comprises a first active material, the first active material comprises a first particle group and a second particle group, the compaction density of the first particle group is P1 after the first particle group is compacted under the pressure of 5 tons, when the compaction density of the second particle group is P2 after the second particle group is compacted under the pressure of 5 tons, the relational expression 1.0 < = P1/P2 < = 1.5 is satisfied; wherein when the volume percentage in the first particle group reaches 50%, the corresponding particle size value Dv50 meets the relational expression: 13 [mu] m < = Dv50 < = 20 [mu] m; when the volume percentage in the second particle group reaches 50%, the c