A secondary battery, comprising an electrode assembly , a packaging bag , and electrode leads , wherein the electrode assembly is accommodated in the packaging bag and comprises a first electrode member , a second electrode member and a separator that separates the first electrode member from the second electrode member ; the first electrode member comprises an insulating substrate , a conductive layer , an active material layer and a conductive structure ; the conductive layer is provided on a surface of the insulating substrate , the conductive layer is provided with a first portion and a second portion extending from the first portion , the first portion is coated with the active material layer , the second portion is not coated with the active material layer , and the conductive structure is welded to the second portion to form a first welding area (W1); the electrode leads are connected to the conductive structure and extend to an outside of the packaging bag ; a portion of the insulating substrate corresponding to the first portion and the first portion form a main body (P1), and a portion of the insulating substrate corresponding to the second portion and the second portion form an electric guide portion (P2); the electric guide portion (P2) is provided with an inclined area (P21) arranged obliquely with respect to the main body (P1), and the first welding area (W1) is at least partially located in the inclined area (P21), the first welding area (W1) and the first portion are spaced apart along an extension direction of the electric guide portion (P2), the electrical guide portion (P2) is also provided with a transition area (P22) connected between the inclined area (P21) and the main body (PI); and the inclined area (P21) is bent toward the electrode leads relative to the transition area (P22). wherein the electrode assembly is accommodated in the packaging bag and comprises a first electrode member , a second electrode member and a separator that separates the first electrode member from the second electrode member ; the first electrode member comprises an insulating substrate , a conductive layer , an active material layer and a conductive structure ; the conductive layer is provided on a surface of the insulating substrate , the conductive layer is provided with a first portion and a second portion extending from the first portion , the first portion is coated with the active material layer , the second portion is not coated with the active material layer , and the conductive structure is welded to the second portion to form a first welding area (W1); the electrode leads are connected to the conductive structure and extend to an outside of the packaging bag ; a portion of the insulating substrate corresponding to the first portion and the first portion form a main body (P1), and a portion of the insulating substrate corresponding to the second portion and the second portion form an electric guide portion (P2); the electric guide portion (P2) is provided with an inclined area (P21) arranged obliquely with respect to the main body (P1), and the first welding area (W1) is at least partially located in the inclined area (P21), the first welding area (W1) and the first portion are spaced apart along an extension direction of the electric guide portion (P2), the electrical guide portion (P2) is also provided with a transition area (P22) connected between the inclined area (P21) and the main body (PI); and the inclined area (P21) is bent toward the electrode leads relative to the transition area (P22). <EOS>