Secondary battery and electronic apparatus
AssigneeNingde Amperex Technology Limited
InventorsGengjin KONG, Zengbin WEI, Xinghua TAO
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Abstract
A secondary battery includes a positive electrode plate, a negative electrode plate, an electrolyte, and a separator. The separator includes a base film, where a pore size distribution of the base film is a bimodal distribution. A pore size on a side of the base film facing the negative electrode plate is larger than a pore size on a side of the base film facing the positive electrode plate. The pore size on the side of the base film facing the negative electrode plate is 60 nm to 500 nm, and the pore size on the side of the base film facing the positive electrode plate is 5 nm to 55 nm. This can improve the fast charging performance of the secondary battery and alleviate lithium precipitation.
Claims20
A secondary battery, comprising a positive electrode plate, a negative electrode plate, an electrolyte, and a separator;
- the separator is disposed between the positive electrode plate and the negative electrode plate;
- wherein the separator comprises a base film, the base film comprises a first region and a second region along a thickness direction of the base film;
- the first region is disposed on a side of the base film facing the negative electrode plate and the second region is disposed on a side of the base film facing the positive electrode plate;
- a pore size distribution of pores in the base film is a bimodal distribution;
- a pore size of pores in the first region is larger than a pore size of pores in the second region;
- the pore size of the pores in the first region is 60 nm to 500 nm, and the pore size of the pores in the second region is 5 nm to 55 nm.
An electronic apparatus, wherein the electronic apparatus comprises a secondary battery, wherein the secondary battery comprises a positive electrode plate, a negative electrode plate, an electrolyte, and a separator;
- the separator is disposed between the positive electrode plate and the negative electrode plate;
- wherein the separator comprises a base film, the base film comprises a first region and a second region along a thickness direction of the base film;
- the first region is disposed on a side of the base film facing the negative electrode plate and the second region is disposed on a side of the base film facing the positive electrode plate;
- a pore size distribution of pores in the base film is a bimodal distribution;
- a pore size of pores in the first region is larger than a pore size of pores in the second region;
- the pore size of the pores in the first region is 60 nm to 500 nm, and the pore size of the pores in the second region is 5 nm to 55 nm.
Dependencies are inferred from the claim text.