Secondary battery and electronic apparatus
AssigneeNingde Amperex Technology Limited
InventorChao TANG
Life of this patent
Estimating the term…
Abstract
A secondary battery includes an electrode assembly having a winding structure and an electrolyte. The electrode assembly includes a positive electrode, a separator, and a negative electrode, where the positive electrode and the negative electrode each include a current collector and a material layer disposed on at least one surface of the current collector. The negative electrode material layer extends beyond the positive electrode material layer in a winding direction, the extended region is a first region, a length of the first region is L mm, a length of the negative electrode material layer is L0 mm, and 0.8%≤L/L0≤18%. The electrolyte includes 1,3-propanesultone, and based on total mass of the electrolyte, a mass content of the 1,3-propanesultone is A %, where 0.01≤A≤8.
Claims20
A secondary battery, comprising an electrode assembly having a winding structure and an electrolyte;
- wherein the electrode assembly comprises a positive electrode, a separator, and a negative electrode;
- the positive electrode comprises a positive electrode current collector and a positive electrode material layer disposed on at least one surface of the positive electrode current collector;
- the negative electrode comprises a negative electrode current collector and a negative electrode material layer disposed on at least one surface of the negative electrode current collector;
- the negative electrode material layer comprises a negative electrode active material, the negative electrode active material comprises artificial graphite, and the artificial graphite comprises secondary particles;
- wherein the negative electrode material layer comprises a first region;
- the first region is a region in which the negative electrode material layer extends beyond the positive electrode material layer along a winding direction of the electrode assembly;
- a length of the first region along the winding direction of the electrode assembly is L mm, a length of the negative electrode material layer along the winding direction of the electrode assembly is L0 mm, and 0.8%≤L/L0≤18%;
- and
- the electrolyte comprises 1,3-propanesultone;
- and based on a total mass of the electrolyte, a mass content of the 1,3-propanesultone is A %, wherein 0.01≤A≤8.
An electronic apparatus, comprising a secondary battery, the secondary battery comprises an electrode assembly having a winding structure and an electrolyte;
- wherein the electrode assembly comprises a positive electrode, a separator, and a negative electrode;
- the positive electrode comprises a positive electrode current collector and a positive electrode material layer disposed on at least one surface of the positive electrode current collector;
- the negative electrode comprises a negative electrode current collector and a negative electrode material layer disposed on at least one surface of the negative electrode current collector;
- the negative electrode material layer comprises a negative electrode active material, the negative electrode active material comprises artificial graphite, and the artificial graphite comprises secondary particles;
- wherein the negative electrode material layer comprises a first region;
- the first region is a region in which the negative electrode material layer extends beyond the positive electrode material layer along a winding direction of the electrode assembly;
- a length of the first region along the winding direction of the electrode assembly is L mm, a length of the negative electrode material layer along the winding direction of the electrode assembly is L0 mm, and 0.8%≤L/L0≤18%;
- and
- the electrolyte comprises 1,3-propanesultone;
- and based on a total mass of the electrolyte, a mass content of the 1,3-propanesultone is A %, wherein 0.01≤A≤8.
Dependencies are inferred from the claim text.