Current sharing structure for high-capacity lithium-ion battery system

The invention provides a current sharing structure for a high-capacity lithium-ion battery system. According to the current sharing structure, single batteries are in series-parallel mixed connection to form a mesh-type matrix, so that a current averagely flows through a plurality of merged branches which are divided into a plurality of columns; a plurality of single batteries in each merged branch are connected in parallel; a plurality of single batteries in each merged branch are connected to a plurality of single batteries in the adjacent merged branch in the same column through laminated tandem electric conductors to achieve series connection; a plurality of single batteries in the merged branches at the head end in the first column and the tail end in the last column are correspondingly connected with a plurality of connection contacts of total negative or positive electric conductor busbars of power supply buses through equilong bus wires; and a plurality of single batteries in the merged branch at the head end or the tail end in each other column are connected to a plurality of single batteries in the merged branch at the tail end or the head end in the adjacent column through a plurality of equilong bus wires to achieve series connection. The laminated tandem electric conductors provided by the invention do not need to use a thick electric conductor, so that the weight of battery packs and the heat of the electric conductors can be reduced; and the reliability is improved.