Electric connector and battery comprising the same

1. An electric connector, comprising:

a core fixing part, the core fixing part further including at least two hosting portions, each configured to hold an electrode tab of a winding core of a battery, respectively, and an elongated connection portion having two parallel edges in the elongated direction and configured to connect the two hosting portions disposed along the two parallel edges of the connection portion; and

an extension part connected to the connection portion via a substantially S-shape transition part, wherein the extension part defines a plane that is substantially parallel to a plane defined by the connection portion.

2. The electric connector of claim 1 ,

wherein the extension part is disposed at a first end of the two parallel edges of the connection portion.

3. The electric connector of claim 1 , wherein each of the hosting portions has a substantially U-shaped cross section so as to define a groove to receive and hold the electrode tab of winding core.

4. The electric connector of claim 1 , wherein the hosting portion has an open end and a closed end,

wherein the connection portion and the open end are coplanar, and

wherein the extension part is connected to the first end of the connection portion via the transition part, and the extension part and the closed end are coplanar.

5. The electric connector of claim 4 , wherein both front and rear ends of the hosting portion are opened.

6. The electric connector of claim 1 , wherein the extension part, the transition part and the connection portion are one integral piece.

7. The electric connector of claim 1 , wherein the electric connector is made by an elastic sheet.

8. The electric connector of claim 7 , wherein a thickness of the elastic sheet is about 0.1 mm to about 3 mm.

9. A battery, comprising:

a shell;

a cover plate connected to the shell so as to define an inner space therebetween;

electrode terminals disposed on the cover plate;

at least two winding cores received in the inner space and each having a non-coated region configured as an electrode tab and a coated region; and

an electric connector, the electric connector further including:

a core fixing part, the core fixing part further including at least two hosting portions, each configured to hold an electrode tab of a winding core of a battery, respectively, and an elongated connection portion having two parallel edges in the elongated direction and configured to connect the two hosting portions disposed along the two parallel edges of the connection portion; and

an extension part connected to the connection portion via a substantially S-shape transition part, wherein the extension part defines a plane that is substantially parallel to a plane defined by the connection portion;

wherein each electrode tab of the winding cores is received in a corresponding hosting portion of the core fixing part respectively, and each extension part of the electric connector is connected to the electrode terminal respectively.

10. The battery of claim 9 , wherein the electrode terminals comprise a negative electrode terminal and a positive electrode terminal,

wherein the electrode tabs of the at least two winding cores comprises a negative electrode tab disposed adjacent to the negative electrode terminal and a positive electrode tab disposed adjacent to the positive electrode terminal, and

wherein the electric connector is connected between the negative electrode tab and the negative electrode terminal and/or between the positive electrode tab and the positive electrode terminal.

11. The battery of claim 9 , wherein the top surface of the hosting portion is welded to an upper end of the electrode tab, and the extension part is welded to the electrode terminal.