NOVELTY - A laminate cell (1) comprises power generating element formed by sequentially stacking positive and negative electrode plates (2A, 2B); positive and negative (5, 7) tabs connected to positive and negative plates through positive and negative (4, 6) leads respectively; and cell package (3) formed of metal composite film, which hermetically seals power generating element and electrolyte. The heat capacity of a portion of positive and negative tab, on which positive and negative leads are joined respectively, are made larger than that of other portions of the tabs by coating with resin.    USE - As laminate cell (claimed) which is useful in assembled battery, battery module and electric vehicle, particularly a lithium ion secondary battery.    ADVANTAGE - The laminate cell is a highly reliable laminate cell which avoids the problem of an occurrence of a short circuit between the metal film of the metal composite film for use in the cell package and the positive or negative tab, or between the metal film and the positive or negative leads, and to provide an assembled battery, a battery module and an electric vehicle. The prior art problem of the short circuit is avoided in the present laminate cell while maintaining the sealing capabilities on the edges of the cell package, and ensuring both durability and reliability.    DETAILED DESCRIPTION - A laminate cell (1) comprises a power generating element formed by sequentially stacking positive electrode plates and negative electrode plates (2A, 2B) while interposing separators between the plates; a positive tab (5) connected to the positive electrode plates through positive leads (4); a negative tab (7) connected to the negative electrode plates through negative leads (6); and a cell package (3) formed of a metal composite film, for hermetically sealing the power generating element and an electrolyte. A resin having a larger heat capacity per unit weight than that of the positive and negative tab is provided on a portion where the positive and negative leads are connected to the positive and negative tabs, respectively, so that a heat capacity of the portions where the positive and negative leads are connected is made larger than that of their other portions.    DESCRIPTION OF DRAWING(S) - The figure shows a cross sectional view taken on line II-II of a laminate cell.    Laminate cell (1)    Stacked electrode (2)    Positive electrode plates (2A)    Negative electrode plates (2B)    Separators (2C)    Cell package (3)    Positive leads (4)    Positive tab (5)    Negative leads (6)    Negative tab (7)