Battery assembly

A battery assembly, comprising:

• a secondary battery formed by stacking a plurality of unit battery cells having a cathode and an anode;
• a collector electrode provided on each end surface of said secondary battery positioned in the stacking direction of said unit battery cells, and
• a terminal portion formed at said collector electrode, protruded outward from a side surface of said secondary battery, to which a conductive member is connected for charging and discharging;
• wherein a coolant is supplied to said terminal portion to cool said terminal portion, and a vent hole is formed in said terminal portion, allowing flow of said coolant;
• further comprising
• a collector foil provided between said unit battery cells, wherein said collector electrode is formed to be thicker than said collector foil.

A battery assembly, comprising:

• a secondary battery formed by stacking a plurality of unit battery cells having a cathode and an anode, a collector electrode provided on each end surface of said secondary battery positioned in the stacking direction of said unit battery cells, and a terminal portion formed at said collector electrode, protruded outward from a side surface of said secondary battery, to which a conductive member is connected for charging and discharging;
• wherein a coolant is supplied to said terminal portion to cool said terminal portion, said secondary battery includes first and second secondary batteries stacked to have said cathodes opposed to each other or said anodes opposed to each other;
• said collector electrode has a first collector electrode provided between said first secondary battery and said second secondary battery for electrically connecting said first secondary battery and said second secondary battery, and a second collector electrode of a polarity different from that of said first collector electrode, formed on a surface of said first secondary battery positioned opposite to the surface on which said first collector electrode is formed;
• and
• said terminal portion has a first terminal portion provided on said first collector electrode and a second terminal portion provided on said second collector electrode,
• wherein a vent hole is formed in at least one of said first and second terminal portions, allowing flow of said coolant, and a guide wall formed in at least one of said first and second terminal portions and around said vent hole, guiding said coolant to said vent hole;
• and
• further comprising a connecting portion formed in at least one of said first and second terminal portions, to which said conductive member is connected, wherein said vent hole is formed in said terminal portion and around said connecting portion.