Negative electrode plate, secondary battery, battery module, battery pack, and electric apparatus

A secondary battery, comprising:

• a negative electrode plate comprising:
• a negative electrode current collector;
• and
• active material layers disposed on at least one surface of the negative electrode current collector, the active material layers comprising:
• a first active material layer comprising a first active material;
• and
• a second active material layer disposed on a surface of the first active material layer and comprising a second active material;
• wherein:
• the active material layers satisfy α×CW2≤CW1;
• α is a relative factor of layer spacings, wherein
• α
• =
• d
• ⁢
• 2
• d
• ⁢
• 1
• and 1≤α≤1.12;
• d1 is a layer spacing corresponding to a d002 peak of the first active material, in units of nm;
• d2 is a layer spacing corresponding to a d002 peak of the second active material, in units of nm;
• CW1 is mass per unit area of the first active material layer disposed on the negative electrode current collector, in units of g/m2;
• and
• CW2 is mass per unit area of the second active material layer disposed on the negative electrode current collector, in units of g/m2.

A battery module comprising:

• a secondary battery comprising a negative electrode plate comprising:
• a negative electrode current collector;
• and
• active material layers disposed on at least one surface of the negative electrode current collector, the active material layers comprising:
• a first active material layer comprising a first active material;
• and
• a second active material layer disposed on a surface of the first active material layer and comprising a second active material;
• wherein:
• the active material layers satisfy a α×CW2≤CW1;
• α is a relative factor of layer spacings, wherein
• α
• =
• d
• ⁢
• 2
• d
• ⁢
• 1
• and 1≤α≤1.12;
• d1 is a layer spacing corresponding to a d002 peak of the first active material, in units of nm;
• d2 is a layer spacing corresponding to a d002 peak of the second active material, in units of nm;
• CW1 is mass per unit area of the first active material layer disposed on the negative electrode current collector, in units of g/m2;
• and
• CW2 is mass per unit area of the second active material layer disposed on the negative electrode current collector, in units of g/m2.