Lithiation device

A lithiation device for applying a lithium film (L) on an electrode plate (P), comprising:

• a rolling mechanism, comprising a first roller and a second roller, wherein the first roller and the second roller are configured to roll the electrode plate (P) and the lithium film (L) so as to apply the lithium film (L) on the electrode plate (P);
• an adjustment mechanism, connected to the rolling mechanism and configured to adjust a gap and/or a rolling force between the first roller and the second roller;
• a first monitoring mechanism, configured to monitor a length of the electrode plate (P) in a direction of traveling after the electrode plate (P) passes through the rolling mechanism and is rolled;
• and
• a controller, configured to control the adjustment mechanism based on a comparison result of the length monitored by the first monitoring mechanism and a target length so that the length of the electrode plate (P) after the electrode plate (P) passes through the rolling mechanism approximates to the target length;
• wherein:
• the electrode plate (P) is provided with a plurality of spaced mark points (P1) along a traveling direction of the electrode plate (P), and the first monitoring mechanism is configured to monitor a distance between two adjacent ones of the plurality of spaced mark points (P1) after the electrode plate (P) passes through the rolling mechanism;
• the rolling mechanism further comprises a servo motor configured to drive the first roller and/or the second roller;
• the first monitoring mechanism comprises a monitoring unit arranged at downstream of the rolling mechanism in a feeding direction of the electrode plate (P), and configured to send a signal when one of the plurality of spaced mark points (P1) is monitored;
• and
• the first monitoring mechanism is further configured to read a position difference monitored by an encoder of the servo motor during an interval of two signals to obtain a distance between two adjacent ones of the plurality of spaced mark points (P1).