【TECHNICAL FIELD】
The present disclosure relates to a unit cell and a battery cell including the same, and more
particularly to a unit cell configured to adhere an electrode and a separator as well as a separator
and a separator using an adhesive composition instead of a conventional lamination using heat and
pressure, and a battery cell including the same.
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【BACKGROUND ART】
As technology development and demands for mobile devices increase, the demand for
batteries as energy sources is rapidly increasing. In particular, a secondary battery has attracted
considerable attention as an energy source for power-driven devices, such as an electric bicycle,
15 an electric vehicle, and a hybrid electric vehicle, as well as an energy source for mobile devices,
such as a mobile phone, a digital camera, a laptop computer and a wearable device.
Based on the shape of a battery case, such a secondary battery may be classified into a
cylindrical battery where an electrode assembly is mounted in a cylindrical metal can, a prismatic
battery where an electrode assembly is mounted in a prismatic metal can, and a pouch-type battery
20 where an electrode assembly is mounted in a pouch type case formed of an aluminum laminate
sheet. Here, the electrode assembly mounted in the battery case is a power generating element,
having a structure including a cathode, an anode, and a separator interposed between the cathode
and the anode, and capable of being charged and discharged. The electrode assembly may be
classified as a jelly-roll type electrode assembly configured to have a structure in which a long
25 sheet-type cathode and a long sheet-type anode, which are coated with active materials, are wound
in a state where a separator is interposed between the cathode and the anode, and a stacked type
electrode assembly configured to have a structure in which a plurality of cathodes and anodes are
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sequentially stacked in a state in which separators are interposed between the cathodes and the
anodes.
Among them, particularly, a pouch-type battery, having a structure in which a
stacked/folded type electrode assembly is mounted in a pouch-type battery case formed of an
5 aluminum laminate sheet, has advantages such as low manufacturing costs, small weight, and easy
shape deformation, and therefore, its usage is gradually increasing.
Here, in the case of a stacked type electrode assembly, it is generally manufactured by
preparing unit cells in advance and then stacking a plurality of the unit cells. More specifically,
the unit cell can apply heat and pressure through a stacking device in a state of being alternately
10 stacked in the order of separator-anode-separator-cathode, and thereby, respective components can
be fixed to each other.