Electrode calendering with rollers having controllable sleeves
An electrode calendering system for reducing post-calendering electrode wrinkling includes at least one roller configured to compress an electrode and a sleeve. The roller is defined by an outer surface configured to contact the electrode. The outer surface has a first edge portion at a first side of the roller and a second edge portion at a second side of the roller opposing the first side. The first edge portion and the second edge portion of the roller align with first and second outer edges of the electrode when the electrode contacts the roller. The sleeve is disposed about the outer surface of the roller along the first edge portion, the sleeve having a controllable thickness to adjust a pressure between the first outer edge of the electrode and the sleeve. Other example systems and methods for reducing post-calendering electrode wrinkling are also disclosed.
1 . An electrode calendering system for reducing post-calendering electrode wrinkling, the electrode calendering system comprising:
at least one roller configured to compress an electrode, the roller defined by an outer surface configured to contact the electrode, the outer surface having a first edge portion at a first side of the roller, a second edge portion at a second side of the roller opposing the first side, and a middle portion disposed between the first edge portion and the second edge portion, the first edge portion and the second edge portion of the roller aligning with first and second outer edges of the electrode when the electrode contacts the roller, the middle portion configured to contact an interior region of the electrode between the first and second outer edges; and
a sleeve disposed about the outer surface of the roller only along the first edge portion, the sleeve having an outer surface configured to contact the first outer edge of the electrode, the sleeve having a controllable thickness extending from the outer surface of the roller to adjust a pressure between the first outer edge of the electrode and the sleeve when the outer surface of the sleeve contacts the first outer edge of the electrode and the middle portion of the outer surface of the roller contacts the interior region of the electrode,
wherein the sleeve includes a plurality of knitted courses each having loops interlocking with loops of an adjacent knitted course of the plurality of knitted courses, and
wherein the outer surface of the sleeve has a larger diameter than the middle portion of the outer surface of the roller.
2 . The electrode calendering system of claim 1 , wherein:
the sleeve is a first sleeve;
the electrode calendering system further comprises a second sleeve disposed on the outer surface of the roller along the second edge portion; and
the second sleeve has a controllable thickness to adjust a pressure between the second outer edge of the electrode and the second sleeve.
3 . The electrode calendering system of claim 1 , wherein the thickness of the sleeve adjusts passively to modulate the pressure between the first outer edge of the electrode and the sleeve.
4 . The electrode calendering system of claim 1 , wherein one or more of the knitted courses includes an inlay element woven therein.
5 . The electrode calendering system of claim 1 , wherein the sleeve includes multiple inlaid elements having a sinusoidal shape in a circumferential direction relative to the roller.
6 . The electrode calendering system of claim 1 , wherein:
the plurality of knitted courses includes a first set of courses formed of a smart material and a second set of courses formed of non-smart materials; and
the first set of courses and the second set of courses are collocated or alternated in occurrence within the sleeve.
7 . The electrode calendering system of claim 1 , wherein the sleeve includes a smart material.
8 . The electrode calendering system of claim 7 , wherein the smart material includes an elastic shape memory alloy.
9 . The electrode calendering system of claim 7 , wherein the sleeve includes a support layer and the smart material element integrated into the support layer.
10 . The electrode calendering system of claim 9 , wherein:
the support layer is a first support layer; and
the sleeve includes a second support layer disposed along a surface of the first support layer such that a portion of the layer of the smart material is positioned between the first support layer and the second support layer.
11 . The electrode calendering system of claim 1 , wherein-further comprising:
at least one optical sensor disposed downstream of the roller;
a temperature control device adjacent to the sleeve; and
a control module in communication with the optical sensor, the control module configured to receive a signal from the optical sensor and control the temperature control device based on the signal from the optical sensor to adjust a temperature of the sleeve, thereby adjusting the pressure between the first outer edge of the electrode and the sleeve.
12 . The electrode calendering system of claim 1 , wherein the thickness of the sleeve is actively controlled to adjust the pressure between the first outer edge of the electrode and the sleeve.
13 . The electrode calendering system of claim 1 , further comprising:
a force or pressure sensor disposed between the sleeve and the roller;
a temperature control device adjacent to the sleeve; and
a control module in communication with the force or pressure sensor and the temperature control device, the control module configured to receive a signal from the force or pressure sensor and control the temperature control device based on the signal to adjust a temperature of the sleeve, thereby adjusting the pressure between the first outer edge of the electrode and the sleeve.
14 . An electrode calendering method for reducing post-calendering electrode wrinkling, the electrode calendering method comprising:
receiving an electrode at a roller, the roller defined by an outer surface configured to contact the electrode, the outer surface having a first edge portion at a first side of the roller, a second edge portion at a second side of the roller opposing the first side, and a middle portion disposed between the first edge portion and the second edge portion, the first edge portion and the second edge portion of the roller aligning with first and second outer edges of the electrode when the electrode contacts the roller, the middle portion contacting an interior region of the electrode between the first and second outer edges; and
controlling a thickness of a sleeve disposed about the outer surface of the roller only along the first edge portion, to adjust a pressure between the first outer edge of the electrode and the sleeve when an outer surface of the sleeve contacts the first outer edge of the electrode and the middle portion of the outer surface of the roller contacts the interior region of the electrode, the thickness of the sleeve extending from the outer surface of the roller,
wherein the sleeve includes a plurality of knitted courses each having loops interlocking with loops of an adjacent knitted course of the plurality of knitted courses, and
wherein the outer surface of the sleeve has a larger diameter than the middle portion of the outer surface of the roller.
15 . The electrode calendering method of claim 14 , wherein controlling the thickness of the sleeve includes passively adjusting the thickness of the sleeve to modulate the pressure between the first outer edge of the electrode and the sleeve.
16 . The electrode calendering method of claim 14 , wherein controlling the thickness of the sleeve includes actively controlling thickness of the sleeve to adjust the pressure between the first outer edge of the electrode and the sleeve.
17 . The electrode calendering method of claim 14 , wherein:
one or more of the knitted courses includes an inlay woven therein.
18 . The electrode calendering method of claim 14 , wherein the sleeve includes a smart material.
19 . The electrode calendering method of claim 18 , further comprising:
receiving a signal from a force or pressure sensor disposed between the sleeve and the roller; and
controlling a temperature control device based on the signal to adjust a temperature of the sleeve.
20 . The electrode calendering method of claim 18 , wherein the smart material includes an elastic shape memory alloy.