US 12,251,871 B2
Roller embossing method for flexible graphite polar plates of fuel cells
Yichong Zhang, Shanghai (CN); Xiaojing Chen, Shanghai (CN); Ang Li, Shanghai (CN); Jinjian Zhang, Shanghai (CN); Xiaolei Zhang, Shanghai (CN); Xiaohui Li, Shanghai (CN); Quanquan Gan, Shanghai (CN); Yongzhan Wang, Shanghai (CN); Wei Dai, Shanghai (CN); and He Zhang, Shanghai (CN)
Assigned to Shanghai Shenli Technology Co., Ltd., Shanghai (CN)
Filed by Shanghai Shenli Technology Co., Ltd., Shanghai (CN)
Filed on Aug. 10, 2021, as Appl. No. 17/397,999.
Claims priority of application No. 202110148623 (CN), filed on Feb. 2, 2021.
Prior Publication US 2022/0242034 A1, Aug. 4, 2022
Int. Cl. B29C 59/04 (2006.01); B29C 59/00 (2006.01); B29L 31/34 (2006.01); H01M 8/0247 (2016.01)
CPC B29C 59/04 (2013.01) [B29C 59/002 (2013.01); H01M 8/0247 (2013.01); B29L 2031/3468 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A roller embossing method for flexible graphite polar plates of fuel cells, comprising:
step (1) adjusting a clearance of an embossing roller pair to a target thickness value of a polar plate, wherein the embossing roller pair includes structural features of patterns of the polar plate to be formed, and the embossing roller pair includes an upper embossing roller and a lower embossing roller;
step (2) feeding a flexible graphite slab in front of the embossing roller pair, and entangling the flexible graphite slab by means of opposite rotation of the embossing roller pair;
step (3) after the flexible graphite slab is entangled, continuing to forward roll the flexible graphite slab for 10-100 mm, and then reversely rolling the flexible graphite slab for 5-90 mm by means of synchronous and opposite rotation of the upper embossing roller and the lower embossing roller, wherein one time of forward rolling and one time of reverse rolling are referred to as reciprocal rolling;
step (4) forming the polar plate after several times of reciprocal rolling, and separating the polar plate from the embossing roller pair; and
step (5) performing subsequent treatment on the rolled flexible graphite polar plate,
wherein in the step (3), during each time of reciprocal rolling, a reverse rolling distance is smaller than a forward rolling distance,
wherein during the reverse rolling, the structural features of patterns of the polar plate to be formed of the embossing roller pair partially overlapped with polar plate patterns on the flexible graphite slab rolled in the forward rolling.