Protective circuit module for secondary battery and battery pack using the same
AssigneeSamsung SDI Co., Ltd.
InventorSeok Koh
Life of this patent
Estimating the term…
Abstract
A protective circuit module for a secondary battery includes a circuit board. At least one protection control circuit element for preventing overcharge and over-discharge of the secondary battery is mounted on the circuit board. A first conductive pad is coupled to the circuit board. A positive temperature coefficient device is between the at least one protection control circuit and the first conductive pad such that when a secondary battery temperature reaches a threshold value, resistance of the positive temperature coefficient device is increased and battery current is reduced.
Claims15
A protective circuit module for a secondary battery comprising:
- a circuit board having a through hole;
- at least one protection control circuit element on the circuit board for preventing overcharge and over-discharge of the secondary battery;
- a first conductive pad coupled to the circuit board, wherein the first conductive pad comprises:
- a protrusion coupled with the through hole in the circuit board;
- and
- a plate portion connected to the protrusion and coupled to the circuit board by solder;
- and
- a positive temperature coefficient device between the at least one protection control circuit element and the first conductive pad, wherein the positive temperature coefficient device is resistance welded to and directly contacts the plate portion such that when a secondary battery temperature reaches a threshold value, resistance of the positive temperature coefficient device is increased and battery current is reduced,
- wherein the positive temperature coefficient device comprises:
- a first conductive plate resistance welded to the plate portion;
- a positive temperature coefficient resistance element connected to the first conductive plate;
- and
- a second conductive plate connected to the positive temperature coefficient resistance element,
- wherein the second conductive plate directly contacts both the circuit board and the positive temperature coefficient resistance element.
A battery pack comprising:
- a secondary battery;
- a first electrode tab and a second electrode tab each protruding from the secondary battery;
- a protective circuit module comprising:
- a circuit board;
- at least one protection control circuit element on the circuit board for preventing overcharge and over-discharge of the secondary battery;
- a first conductive pad welded to the circuit board;
- and
- a positive temperature coefficient device between the at least one protection control circuit element and the first conductive pad, wherein the first conductive pad directly contacts a first side of the positive temperature coefficient device such that when a secondary battery temperature reaches a threshold value, resistance of the positive temperature coefficient device is increased and battery current is reduced;
- a first conductive lead spaced from the first conductive pad and electrically coupled to a second side of the positive temperature coefficient device opposite to the first side;
- and
- a resin securing the protective circuit module to the secondary battery while exposing electrode terminals on the circuit board,
- wherein the positive temperature coefficient device comprises:
- a first conductive plate resistance welded to the first conductive pad;
- a positive temperature coefficient resistance element connected to the first conductive plate;
- and
- a second conductive plate connected to the positive temperature coefficient resistance element,
- wherein the second conductive plate directly contacts both the circuit board and the positive temperature coefficient resistance element.
Dependencies are inferred from the claim text.