Battery pack

摘要

Provided is a battery pack, which can prevent easy detachment of a welded part between a cap plate and a case due to external impact, thereby enhancing hermeticity and reliability.

主权项

1. A battery pack, comprising:
a bare cell having a cap plate that defines a first surface and a first electrode that extends outward from the first surface of the cap plate and a second electrode; and a protection circuit assembly electrically connected with the bare cell and including a protection circuit board having a first and a second side and a protection circuit and a PTC thermistor extending outward from the second side of the protection circuit board wherein the protection circuit board is mounted between the first and second electrode so as to be positioned above the first surface of the cap plate with the protection circuit and PTC thermistor being positioned between the first and second electrode, wherein the protection circuit board includes a protection circuit module having an encapsulating part formed of a first material, and the encapsulating part of the protection circuit module extends from the second side of the protection circuit board towards the first surface wherein the protection circuit board and the encapsulating part define an encapsulated volume containing the protection circuit, the PTC thermistor, and an empty space that extends at least between the protection circuit and the PTC thermistor wherein the encapsulating part is supported by the first surface of the cap plate of the bare cell between the locations where the protection circuit board is connected to the first and second electrodes such that the contact of the bare cell and the protection circuit module inhibits damage to the bare cell as a result of application of external forces to the bare cell and wherein the protection circuit board is directly connected to and supported so as to be suspended over the cap plate by the electrode and the contact of the protection circuit module to the first surface of the cap plate; and a shock absorbing member formed of a second material different than the first material that is directly positioned on the surface of the cap plate and wherein the encapsulating part is directly in contact with the shock absorber member.