Battery module, battery pack, device using battery module as power source, and method of manufacturing battery module

A battery pack comprising a plurality of battery modules, each battery module comprising:

• at least two battery cells;
• a connecting piece configured to electrically connect two battery cells of the at least two battery cells;
• a circuit board with a sampling functionality electrically connected to the at least two battery cells;
• and
• a protective layer comprising a first protective portion configured to cover the connecting piece and a second protective portion configured to cover the circuit board and connected to the first protective portion, the second protective portion and the first protective portion being made from the same material;
• wherein a melting point of the first protective portion is greater than that of the connecting piece,
• wherein the first protective portion comprises a first side protective portion configured to cover an outer side of the connecting piece, and
• wherein the second protective portion comprises:
• a second upper protective portion configured to cover an upper surface of the circuit board away from the at least two battery cells;
• and
• a second lower protective portion arranged opposite to the second upper protective portion and configured to cover a lower surface of the circuit board facing to the at least two battery cells.

A device comprising:

• a power source comprising a battery module,
• wherein the battery module comprises:
• at least two battery cells;
• a connecting piece configured to electrically connect two battery cells of the at least two battery cells;
• a circuit board with a sampling functionality electrically connected to the at least two battery cells;
• and
• a protective layer comprising a first protective portion configured to cover the connecting piece and a second protective portion configured to cover the circuit board and connected to the first protective portion, the second protective portion and the first protective portion being made from the same material;
• wherein a melting point of the first protective portion is greater than that of the connecting piece,
• wherein the first protective portion comprises a first side protective portion configured to cover an outer side of the connecting piece, and
• wherein the second protective portion comprises:
• a second upper protective portion configured to cover an upper surface of the circuit board away from the at least two battery cells;
• and
• a second lower protective portion arranged opposite to the second upper protective portion and configured to cover a lower surface of the circuit board facing to the at least two battery cells.