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|1. (WO2018218837) STEPPED TYPE BATTERY POLE PIECE AND SPECIAL PRESS ROLLER THEREOF|
|Applicants:||ZHONGTIAN ENERGY STORAGE TECHNOLOGY CO., LTD
|Title:||STEPPED TYPE BATTERY POLE PIECE AND SPECIAL PRESS ROLLER THEREOF|
The invention discloses a stepped type battery pole piece and a special press roller thereof. The stepped type battery pole piece comprises a pole piece body and a stepped type support, wherein the stepped type support and the pole piece body are integrally formed, the pole piece body consists of dressing layers and a current collector, the dressing layers are symmetrically arranged at upper and lower ends of the current collector, the stepped type support is fixedly mounted on the dressing layers, and the stepped type support and the dressing layers are integrally formed. The press roller comprises a press roller body, wherein multiple grooves perpendicular to the press roller body are formed in the outer surface of the press roller body, and the size and shape of each groove are consistent with those of the stepped type support. The present invention optimize the height of the step and the expansion rate of the pole piece by pressing the stepped type support on the dressing layers, by controlling the height difference between the stepped type support and the dressing layers in combination with the expansion rate of the selected material during production of batteries, so that buffer space in a roll core is controlled quantitatively, the stress caused by expansion of the pole piece is controlled quantitatively, the internal stress is effectively reduced, and the structure stability and safety are improved.