Fuse for battery cells

1. A battery system comprising:

a battery cell having a cell body and a voltage terminal extending out of the cell body and having first and second terminal edges;

a busbar to which an upper end of the voltage terminal is electrically connected; and

a zipper fuse formed in a portion of the terminal between the cell body and the busbar, wherein the zipper fuse comprises,

an array of perforations through the voltage terminal and extending across the voltage terminal from the first edge to the second edge, wherein the array of perforations comprises:

a first row of perforations that includes a first elongated perforation to form a first elongated portion, wherein said first elongated portion of the first elongated perforation extends horizontally across the voltage terminal and a plurality of first circular perforations; and

a second row of perforations parallel to the first row of perforations that includes a second elongated perforation to form a second elongated portion, wherein said second elongated portion of the second elongated perforation extends horizontally across the voltage terminal and a plurality of second circular perforations,

wherein the first elongated perforation is on an opposite side of the voltage terminal than the second elongated perforation, and

wherein each of the first elongated perforation and the second elongated portion have an internal area that is greater than an internal area of the first and second circular perforations.

2. The battery system of claim 1 , further comprising a busbar support between busbar and the cell body.

3. The battery system of claim 2 , wherein the busbar support includes a slot through which the voltage terminal passes.

4. The battery system of claim 3 , wherein the first and second rows of perforations is between support and cell body.

5. The battery system of claim 1 , wherein the battery cell is a prismatic battery cell.