According to actual usage needs, one or more electrode assemblies 30 may be configured. As shown in FIG. 1-D, at least two separate wound electrode assemblies 30 may alternatively be provided in the battery. A main body portion of the electrode assembly 30 may be formed by stacking or winding a first electrode plate, a second electrode plate, and a separator located between the first electrode plate and the second electrode plate that are arranged adjacently, where the separator is an insulator sandwiched between the first electrode plate and the second electrode plate. The main body portion has two opposite end surfaces. In this embodiment, for example, the first electrode plate is a positive electrode plate and the second electrode plate is a negative electrode plate. A positive electrode active substance is coated on a coating zone of the positive electrode plate, and the negative electrode active substance is coated on the coating zone of the negative electrode plate. A plurality of uncoated zones extending from a coating zone of the main body portion are stacked as tabs. The electrode assembly includes two tabs 301: a positive tab and a negative tab. The positive tab extends from a coating zone of the positive electrode plate, and the negative tab extends from a coating zone of the negative electrode plate.