Battery module and battery pack including same

Abstract

The present invention provides a battery module and a battery pack comprising the same, the battery module comprising: a plurality of pouch-type battery cells, each of the plurality of pouch-type battery cells comprising an electrode assembly, a pouch, and an electrode lead, the pouch comprising at least one electrode accommodating portion and a sealing portion; and a bus bar assembly provided with at least one bus bar having conductivity, in which the electrode accommodating portion includes: a main body portion having a width greater than a height; the pouch-type battery cell includes a main body portion, an electrode lead extending in a height direction from a center portion of the main body portion, and an extension portion extending and protruding in the height direction from a center portion of the main body portion, the electrode lead extending in the height direction, and a bus bar coupled to the electrode lead in a vertical direction of the pouch-type battery cell, an upper end portion of the bus bar in the height direction being lower than an upper end portion of the extension portion of the pouch.

Description

technical field [0001] The present invention relates to a battery module including a battery cell stack in which a plurality of battery cells are stacked, and a battery pack in which the battery cell stack is mounted directly or via a battery module. Background technique [0002] Unlike primary batteries, secondary batteries can be charged and discharged, making them widely used in various fields such as digital cameras, mobile phones, notebook computers, hybrid vehicles, and electric vehicles. Examples of the secondary battery include a nickel-cadmium battery, a nickel metal hydride battery, a nickel-hydrogen battery, and a lithium secondary battery. [0003] Among these secondary batteries, much research is being conducted on lithium secondary batteries having high energy density and discharge voltage. In recent years, lithium secondary batteries are manufactured as pouch type battery cells having flexibility or rectangular or cylindrical can type battery cells having rig...

AI Technical Summary

Problems solved by technology

[0017] However, in the case of the pouch type battery cell 30 according to the prior art, since the electrode lead 35 is extended from the width direction (length direction) of the battery cell 30 ( Figure 5 middle, left and right direction) both ends of the structure are exposed to the outside, so the width of the electrode lead 35 can only be smaller than the height of the battery cell 30

Therefore, the width of the electrode lead 35 is increased to lower the resistance of the battery cell by requiring an increase in the height of the battery cell 30, however, this has a problem contrary to the recent trend of lowering the overall height of the battery module 20 (especially, when used in a vehicle In the case of the battery module, there are more restrictions on the height of the battery module)

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