Patent ID: 9159970
Filing Date: 2015-10-13
Classification: H01M,Y02E

Abstract:
1. A battery pack, comprising: a plurality of electric cells, each of the plurality of electric cells including outer surfaces one of which is provided with a positive electrode connection terminal and a negative electrode connection terminal; and a packaging case that accommodates the plurality of electric cells to align the plurality of electric cells at least in a first direction such that the positive electrode connection terminal and the negative electrode connection terminal of said each of the plurality of electric cells protrude upward from said one of the outer surfaces of the plurality of electric cells, wherein each adjacent ones of the plurality of electric cells in the first direction defines a ventilation space, wherein the packaging case defines first and second passages that extend in the first direction and that are arranged to have the plurality of electric cells located between the first and second passages in a second direction intersecting the first direction, wherein a gas supplied to the first passage flows through the ventilation spaces to the second passage, wherein the packaging case includes a flow rate limitation member, which is arranged biased in an upstream area of the first passage compared to other areas of the first passage, to limit a flow rate of the gas flowing into at least one of the ventilation spaces, which communicate with the upstream area of the first passage, to a predetermined flow rate, wherein the flow rate limitation member comprises a plate material that includes a ventilation section, the plate material being arranged to cover the at least one of the ventilation spaces, and wherein the packaging case includes an inner wall surface extending in the first direction, the first passage is defined between an alignment of the plurality of electric cells positioned at an outermost end in the second direction and the inner wall surface of the packaging case, and the flow rate limitation member is arranged to slope downward from said one of the outer surfaces of the plurality of electric cells to the inner wall surface of the packaging case while extending in the second direction.