Rolling apparatus

1. A rolling apparatus, comprising:

a roller assembly, comprising four rollers rotatable around their respective axes; and

a power source, for driving the four rollers to rotate around their respective axes, wherein

the four rollers are arranged side by side in pairs along a first direction and side by side in pairs along a second direction, the first direction intersects with the second direction, and in the four rollers, any pair of two rollers arranged side by side have a roll gap therebetween; and

in the four rollers, two rollers arranged diagonally are driven by the power source to rotate in a same direction around their axes;

wherein

two roll gaps defined by one of the two rollers arranged diagonally and the two rollers arranged side by side therewith are used for rolling a first electrode plate twice, and

two roll gaps defined by the other one of the two rollers arranged diagonally and the two rollers arranged side by side therewith are used for rolling a second electrode plate twice;

wherein the rolling apparatus further comprises a partition plate;

the partition plate is fixedly disposed in a region defined by the four rollers together and divides the region into two strip moving regions; and

the two strip moving regions are located on a same strip moving route as the two roll gaps for rolling the first electrode plate and the two roll gaps for rolling the second electrode plate, respectively.

2. The rolling apparatus according to claim 1 , wherein the roll gap has an adjustable width.

3. The rolling apparatus according to claim 2 , wherein one of the four rollers is rotatable around only its own axis as a reference roller, and the remaining three are all movable with respect to the reference roller.

4. The rolling apparatus according to claim 3 , wherein

the rollers arranged side by side with the reference roller in the first direction and the second direction are respectively a first adjacent roller and a second adjacent roller, and the roller arranged diagonally with the reference roller is a diagonal roller; and

the first adjacent roller and the second adjacent roller are respectively movable along the first direction and the second direction; and the diagonal roller is movable along the first direction and the second direction.

5. The rolling apparatus according to claim 4 , wherein the diagonal roller and the first adjacent roller move synchronously along the first direction, and the diagonal roller and the second adjacent roller move synchronously along the second direction.

6. The rolling apparatus according to claim 4 , wherein each of the rollers is rotatably mounted on a supporting part, and the movable rollers move along with their respective supporting parts.

7. The rolling apparatus according to claim 6 , wherein

the rolling apparatus further comprises two sets of signal transmitting members and signal receiving members matching each other;

one of the signal transmitting member and the signal receiving member in a same set is disposed at the supporting part at which the diagonal roller is located, and the other one is disposed at the supporting part at which the first adjacent roller or the second adjacent roller is located; and

when the signal transmitting member and the signal receiving member in a same set are disposed opposite each other, a width of the roll gap therebetween is measured.

8. The rolling apparatus according to claim 1 , wherein

the two strip moving regions are arranged as an upper strip moving region and a down strip moving region;

the rolling apparatus further comprises a pressing plate; and

the pressing plate is disposed in the upper strip moving region and defines, together with the partition plate, a strip moving gap for an electrode plate passing through the upper strip moving region to run through.