Protection device and battery pack

A protection device, comprising:

• a plurality of terminal electrodes, comprising a first terminal electrode and a second terminal electrode;
• a fusible conductor, wherein two ends of the fusible conductor are electrically connected to the first terminal electrode and the second terminal electrode, respectively;
• and
• a first heat generating element, comprising two heater electrodes and a first heater, wherein the two heater electrodes and the first heater construct a sandwich structure, and one end of the first heat generating element is coupled to the fusible conductor.

A battery pack, comprising:

• at least one battery element;
• a protection device, comprising:
• a plurality of terminal electrodes, comprising a first terminal electrode and a second terminal electrode;
• a fusible conductor, wherein a lower surface of the fusible conductor is respectively disposed on the first terminal electrode and the second terminal electrode, and the fusible conductor is supported by the first terminal electrode and the second terminal electrode, and two ends of the fusible conductor are electrically connected to the first terminal electrode and the second terminal electrode, respectively, so as to form a two-way current path between the first terminal electrode and the second terminal electrode;
• and
• a first heat generating element, wherein one end of the first heat generating element is coupled to another surface of the fusible conductor different to the lower surface of the fusible conductor, or one end of the first heat generating element is coupled to a surface of any one of the first terminal electrode and the second terminal electrode,
• wherein the protection device is connected in series with the at least one battery element to form at least one charge or discharge current path, and has an ability to disconnect the charge or discharge current path;
• a switching circuit, configured to control a current passing through the first heat generating element;
• and
• a detection control circuit, configured to detect a voltage or a temperature of the at least one battery element, and determine a state of the switching circuit according to the detected voltage or temperature.

A battery pack, comprising:

• at least one battery element;
• a protection device, comprising:
• a plurality of terminal electrodes, comprising a first terminal electrode and a second terminal electrode;
• a fusible conductor, wherein two ends of the fusible conductor are electrically connected to the first terminal electrode and the second terminal electrode, respectively;
• and
• a first heat generating element, comprising two heater electrodes and a first heater, wherein the two heater electrodes and the first heater construct a sandwich structure, and one end of the first heat generating element is coupled to the fusible conductor,
• wherein the protection device is connected in series with the at least one battery element to form at least one charge or discharge current path, and has an ability to disconnect the charge or discharge current path;
• a switching circuit, configured to control a current passing through the first heat generating element;
• and
• a detection control circuit, configured to detect a voltage or a temperature of the at least one battery element, and determine a state of the switching circuit according to the detected voltage or temperature.