Superwide pouch type secondary battery with double tabs
Provided is a superwide pouch type secondary battery comprising an electrode assembly including a cathode plate, an anode plate, and a separator; a pouch surrounding the electrode assembly; and electrode tabs connected to both ends of the electrode assembly and protruding outward of the pouch, wherein the electrode tabs connected to the both ends of the electrode assembly include one or more cathode tabs and anode tabs, respectively, and width of battery cell is more than 4 times longer than height of battery cell such that loading efficiency of the pouch type secondary battery into a vehicle and an energy density may be improved without increasing an internal electrode.
1. A pouch type secondary battery comprising:
an electrode assembly including a cathode plate, an anode plate, and a separator;
a pouch surrounding the electrode assembly; and electrode tabs connected to both ends of the electrode assembly and protruding outward of the pouch,
wherein the electrode tabs connected to the both ends of the electrode assembly include two or more pairs of a cathode tabs and an anode tabs, respectively,
Wc/Hc>4 in which Hc is a length of a battery cell at edges in a first direction of the battery cell to which the electrode tabs are connected and We is a length of the battery cell at edges in a second direction of the battery cell except for protrusion lengths of the electrode tabs, the second direction being perpendicular to the first direction, and,
wherein at least one cathode tab and at least one anode tab are positioned on each side.
2. The pouch type secondary battery of claim 1 ,
wherein Wtg/Hc>0.1 in which Wtg is a distance between the cathode tab and the anode tab.
3. The pouch type secondary battery of claim 1 , wherein Wc/Hc>5.
4. The pouch type secondary battery of claim 1 , wherein Wc/Hc>7.
5. The pouch type secondary battery of claim 2 , wherein 0.3<(Wt1+Wt2)/Hc<0.6 in which Wt1 is a width of the cathode tab and Wt2 is a width of the anode tab.
6. The pouch type secondary battery of claim 1 , wherein a thickness of the cathode tab is larger than a thickness of the anode tab.
7. The pouch type secondary battery of claim 6 , wherein the length of the battery cell at the edge of the second direction is 300 mm or more,
the length of the battery cell at the edge of the first direction is 70 mm or more, and
0.3 mm<t1<1.5 mm and 1.0<t1/t2<2.0 in which t1 is a thickness of the cathode tab and t2 is a thickness of the anode tab.