Electrode assembly, secondary battery, and battery-powered apparatus

A battery-powered apparatus, comprising:

• a secondary battery, the secondary battery comprising:
• a housing having an opening and an accommodating cavity;
• an electrode assembly located in the accommodating cavity, wherein the electrode assembly comprises a negative electrode plate, a positive electrode plate, and a separator, and the negative electrode plate, the separator, and the positive electrode plate are laminated and wound around a winding center,
• wherein the negative electrode plate comprises a first inner layer section, the positive electrode plate comprises a second inner layer section, first inner layer section comprises a negative electrode active material, the second inner layer section comprises a positive electrode active material, and the first inner layer section and the second inner layer section are immediately adjacent to the winding center;
• and
• the first inner layer section is provided with at least one notch portion, the at least one notch portion runs through the first inner layer section in a width direction, the first inner layer section is disposed opposite the second inner layer section, at least one portion the first inner layer section, at least one portion of the second inner layer section, and the at least one notch portion are at least partially aligned in the width direction, the at least one portion of the first inner layer section is exposed to the at least one notch portion and opposite the at least one portion of the second inner layer section through the at least one notch portion in the width direction;
• and
• a top cover assembly covering the opening,
• wherein the secondary battery is configured to provide electrical energy to the battery-powered apparatus.