LITHIUM ION BATTERY AND SEPARATOR THEREOF
A separator includes a base film and a coating which covers a surface of the base film. The coating includes a main body and an edge portion arranged on the periphery of the main body. The edge portion has a greater thickness than the main body, and the edge portion is provided with several patterns arranged at intervals.
1 . A separator, comprising:
a base film; and
a coating covering a surface of the base film;
wherein the coating comprises a main body and an edge portion arranged on the periphery of the main body, the edge portion having a greater thickness than the main body, and the edge portion being provided with several patterns arranged at intervals.
2 . The separator according to claim 1 , wherein a ratio of a thickness of the edge portion to a thickness of the main body ranges from 1.2 to 1.6.
3 . The separator according to claim 1 , wherein the thickness of the edge portion ranges from 4 μm to 8 μm, and the thickness of the main body ranges from 3 μm to 5 μm.
4 . The separator according to claim 1 , wherein a ratio of a width of the edge portion to a width of the main body ranges from 0.17 to 0.33.
5 . The separator according to claim 1 , wherein a width of the edge portion ranges from 10 mm to 20 mm, and a width of the main body ranges from 60 mm to 120 mm.
6 . The separator according to claim 1 , wherein the edge portion comprises a first edge portion and a second edge portion, the first edge portion and the second edge portion being respectively arranged on two sides of the main body, and the first edge portion and/or the second edge portion being provided with the several patterns arranged at intervals.
7 . The separator according to claim 1 , wherein the pattern is at least one of a stripe-shaped pattern, a grid-shaped pattern and a pit-shaped pattern.
8 . The separator according to claim 1 , wherein the base film comprises a first surface and a second surface, and the coating covers the first surface and/or the second surface.
9 . A lithium ion battery, comprising:
a positive electrode plate;
a negative electrode plate; and
the separator of claim 1 arranged between the positive electrode plate and the negative electrode plate.
10 . The lithium ion battery according to claim 9 , further comprising:
an insulating layer arranged at an edge of the positive electrode plate and/or an edge of the negative electrode plate.