Electrode assembly including mandrel having removable portion

摘要

Provided is an electric storage battery including a jelly roll type electrode assembly having a mandrel. The mandrel includes a positive portion, a negative portion and a removable portion. In some embodiments, the mandrel is planar having two faces with a groove on each of the positive and negative portions. The grooves can be on the same or different faces of the mandrel. The grooves are dimensioned to accommodate a positive and negative feedthrough pin. The electrodes are wrapped around the mandrel using the removable portion to wind the mandrel. Once wrapped, the removable portion can be detached. The positive portion and the negative portion are left in the electrode assembly insulated from each other. The mandrel allows tighter wrapping of the jelly roll assembly, increasing battery miniaturization and also results in electrode assemblies in which after-placement of tabs does not result in burrs or shorting.

主权项

1. An electrode assembly comprising:
a mandrel comprising a positive portion, a negative portion, a breakaway incision and one or more removable portions; wherein the positive portion and negative portion are adjacent to and connected to the one or more removable portions; and wherein the mandrel includes a passage from a first face of the mandrel to a second face of the mandrel dividing the positive and negative portions; a positive electrode attached to the positive portion; a negative electrode attached to the negative portion; a positive feedthrough pin; and a negative feedthrough pin; wherein the positive portion has a groove configured to accept the positive feedthrough pin and the negative portion has a groove configured to accept the negative feedthrough pin; wherein the positive electrode and the positive feedthrough pin are conductively connected electrically to the mandrel on the positive portion; wherein the negative electrode and the negative feedthrough pin are conductively connected electrically to the mandrel on the negative portion; and wherein the one or more removable portions are detachable by the breakaway incision.