Stack type jelly roll for secondary battery, battery cell including the same, battery pack including the same, and method of manufacturing the same

A stack type jelly roll electrode assembly for a secondary battery, comprising:

• a first stack of electrodes formed at a predetermined region from a center to an outer side and including a 1-1-th electrode which is any one of a cathode and an anode, a 2-1-th electrode which is the other of the cathode and the anode;
• a pair of second stacks of electrodes formed at a predetermined region from one side and an opposite side of the first stack to an outer side, respectively and including a 1-2-th electrode which is any one of a cathode and an anode, a 2-2-th electrode which is the other of the cathode and the anode;
• a third stack of electrodes formed from an outermost side of either one of the second stacks of electrodes to an outermost side of the stack type jelly roll and including a 1-3-th electrode which is any one of a cathode and an anode, a 2-3-th electrode which is the other of the cathode and the anode;
• and
• a single continuous separator passing around an entire periphery of the stack type jelly roll electrode assembly to form a single separator loop and also passing between each pair of adjacent electrodes only once in a continuous form,
• wherein the separator has a winding form in passing through each pair of adjacent electrodes in the first stack of electrodes,
• wherein the separator has a form folded in a Z shape in passing through each pair of adjacent electrodes in the second stacks of electrodes,
• wherein the separator surrounds the outermost side of the third stack of electrodes in a winding form,
• wherein the separator of the second stack of electrodes formed at the outside from one side of the first stack of electrodes and the separator of the second stack of electrodes formed at the outside from the opposite side of the first stack of electrodes are point symmetrically formed with respect to a center of the first stack of electrodes,
• wherein an electrodes number of the second stack of electrodes is greater than an electrodes number of the first stack of electrodes, and
• wherein the single continuous separator is continuously formed so as to take the winding form in the first stack of electrodes, the Z-shape form in the second stacks of electrodes, and again the winding form in the third stack of the electrodes.