Patent ID: 8691420
Filing Date: 2014-04-08
Classification: H01M,Y02E,Y02P

Abstract:
1. A battery pack, comprising: a plurality of battery cells; a circuit module electrically connected to the battery cells; and a case to accommodate the battery cells and the circuit module, wherein the case comprises: a first case shaped in the form of an open box and having a plurality of coupling protrusions each having a protrusion width formed thereon, and a second case shaped in the form of an open box, being coupled with the first case and having a plurality of coupling holes to engage with the plurality of coupling protrusions wherein the first case further comprises: a placement surface; and a first lateral side that includes first long lateral sides bending and extending from opposite long sides of the placement surface and first short lateral sides bending and extending from opposite short sides of the placement surface and connecting the first long lateral sides, wherein the plurality of coupling protrusions is formed in a plurality of groups of predetermined numbers on one long lateral side of the first long lateral sides and wherein the first case defines a plurality of guide walls that are separate and spaced from each other along the length of the one long lateral side on the one long lateral side of the first long lateral sides, each of the separate plurality of guide walls having grooves corresponding to the groups of coupling protrusions so that the coupling protrusions of each group are exposed via the grooves of the corresponding guide wall, wherein the first case further comprises: a plurality of rib sides including a rib side extending parallel to the other long lateral side of the first long lateral sides and at least one rib side extending parallel to the first short lateral sides inside the placement surface and a plurality of auxiliary holes formed on each of the plurality of the rib sides; and the second case further comprises a plurality of auxiliary protrusions formed on the other long lateral side of the second long lateral sides and the second short lateral sides.