An electrode plate calendering apparatus, configured to calender an electrode plate, wherein the electrode plate comprises a coated region and an uncoated region, and wherein the uncoated regions and the coated regions being distributed alternately along the width direction; and the electrode plate calendering apparatus comprises a calender roller group, a heating part, and a cooling part; the heating part is configured to heat the electrode plate, and the cooling part is configured to cool the electrode plate; the heating part further comprises an extension assembly, and the extension assembly can extend the uncoated region when the heating part heats the electrode plate; the electrode plate passes through the cooling part after passing through the heating part; and the heating part and the cooling part are configured to reduce a difference between an extensibility parameter of the uncoated region and an extensibility parameter of the coated region; and, wherein the heating part comprises multiple first heating units distributed alternately along a width direction of the electrode plate, and each first heating unit is configured to directly heat each corresponding uncoated region; and the cooling part comprises multiple first cooling units distributed alternately along a width direction of the electrode plate, and the first cooling unit is configured to directly cool each corresponding uncoated region; and wherein the heating part further comprises second heating units distributed alternately along the width direction of the electrode plate, and each second heating unit is configured to directly heat each corresponding coated region; and the cooling part further comprises second cooling units distributed alternately along the width direction of the electrode plate, and each second cooling unit is configured to directly cool each corresponding coated region; and wherein the first heating unit heats the uncoated region to a first preset temperature, and the second heating unit heats the coated region to a second preset temperature; the first preset temperature is higher than the second preset temperature; and the first preset temperature is between a room temperature and 350 °C, and the second preset temperature is between the room temperature and 350 °C; and wherein the extension assembly comprises an extension roller disposed downstream of the cooling part, and a tension monitoring part; and a control part of the electrode plate calendering apparatus is able to control a rotation speed of the extension roller according to a monitoring result of the tension monitoring part. wherein the uncoated regions and the coated regions being distributed alternately along the width direction; and the electrode plate calendering apparatus comprises a calender roller group, a heating part, and a cooling part; the heating part is configured to heat the electrode plate, and the cooling part is configured to cool the electrode plate; the heating part further comprises an extension assembly, and the extension assembly can extend the uncoated region when the heating part heats the electrode plate; the electrode plate passes through the cooling part after passing through the heating part; and the heating part and the cooling part are configured to reduce a difference between an extensibility parameter of the uncoated region and an extensibility parameter of the coated region; and, wherein the heating part comprises multiple first heating units distributed alternately along a width direction of the electrode plate, and each first heating unit is configured to directly heat each corresponding uncoated region; and the cooling part comprises multiple first cooling units distributed alternately along a width direction of the electrode plate, and the first cooling unit is configured to directly cool each corresponding uncoated region; and wherein the heating part further comprises second heating units distributed alternately along the width direction of the electrode plate, and each second heating unit is configured to directly heat each corresponding coated region; and the cooling part further comprises second cooling units distributed alternately along the width direction of the electrode plate, and each second cooling unit is configured to directly cool each corresponding coated region; and wherein the first heating unit heats the uncoated region to a first preset temperature, and the second heating unit heats the coated region to a second preset temperature; the first preset temperature is higher than the second preset temperature; and the first preset temperature is between a room temperature and 350 °C, and the second preset temperature is between the room temperature and 350 °C; and wherein the extension assembly comprises an extension roller disposed downstream of the cooling part, and a tension monitoring part; and a control part of the electrode plate calendering apparatus is able to control a rotation speed of the extension roller according to a monitoring result of the tension monitoring part.