KETEP 세계에너지시장정보

1. A secondary battery, wherein, comprising a separator, a positive electrode piece and a negative electrode piece, the separator is located between the positive electrode piece and the negative electrode piece;The septum comprises a base membrane, and the thickness of the base membrane in the direction along the center of the base membrane to the edge of the base membrane satisfies: 1×10-4≤β≤2×10-2, β=(Hx-γ)/Lx2;wherein Hx represents the thickness of X at any position between the center of the base membrane and the edge of the base membrane, in μm, Lx represents the distance from the position X to the center of the base membrane, in cm, γ is the thickness at the center of the base membrane, and the unit is measured in μm;The position X comprises the L/6 position, the L/3 position and the L/2 position, where L is the total length of the base membrane in the direction from the center of the base membrane to the edge of the base membrane;the positive electrode piece is provided with a positive lug, and in the direction along the center of the diaphragm to the edge of the diaphragm, the positive lug is arranged at a position corresponding to the edge of the diaphragm; and/or,The negative electrode piece is provided with a negative electrode lug, and in the direction along the center of the diaphragm to the edge of the diaphragm, the negative pole lug is arranged at a position corresponding to the edge of the diaphragm.