The utility model belongs to the technical field of lithium ion battery, definite theory is a lithium ion battery group convenient to maintain, a plurality of lithium ion battery that the electrode dislocation was planted in lithium ion battery frame and lithium ion battery frame, the lithium ion battery frame include the bottom plate, vertical layout has the baffle on the bottom plate, the lithium ion battery that has planted between the baffle, lithium ion battery and bottom plate between be equipped with the battery backup pad, battery backup pad and bottom plate between be equipped with the spring, the elasticity of spring is for ordering about the rebound of battery backup pad, baffle top still plant the conductor and supply all lithium ion battery's of polyphone electrode and draw forth from the most marginal baffle to supply external load, each lithium ion battery monomer easy dismounting of above -mentioned lithium ion battery group, connect simultaneously reliable and stable,discovery in time and changing rapidly when having made things convenient for phenomenons such as appearing the meteorism at monomer lithium ion battery, very big improvement reliability and the convenience of maintenance of lithium ion battery group work.