The invention relates to the technical field of production of power
lithium ion batteries, and particularly discloses a
slurry filtration system used for a power
lithium ion battery of HEV / PHEV. The
system comprises a
slurry flowing pipeline, a plurality of filters connected in series are arranged in the
slurry flowing pipeline, the filters are in sequential connection according to a descending order of filter pore sizes, and a slurry flowing direction is formed; and the interior of each filter is provided with one screen or two or more parallel screens, a depth-type filter group is connectedin series with the
tail end of the slurry flowing direction, the interior of the depth-type filter group is provided with a plurality of parallel filter elements, and the filter pore size of each
filter element is smaller than the filter pore size of the screen. The
system provided by the invention filters slurry until the particle size of the slurry is in a suitable range in a classified
filtration manner, so that clogging of the screen is effectively avoided, the
filtration process has high stability, and requirements for particle
miniaturization of the slurry used for the
lithium ion battery of the HEV or the HPEV are met; and filter screens with any specifications can adopted for free combination, which is flexible and convenient, and the system is convenient to assemble and disassemble, and convenient for large-scale production.