Battery cell and battery module including the same
A battery cell includes a casing provided with an accommodation space; and an electrode assembly accommodated in the accommodation space and contacting the casing. The electrode assembly may include a negative electrode including a first current collector and a negative electrode mixture applied to the first current collector; a positive electrode including a second current collector and a positive electrode mixture applied to the second current collector; a separator interposed between the positive electrode and the negative electrode; and a guide member accommodating at least one of the negative electrode and the positive electrode and pressurized or stretched by at least one of the negative electrode and the positive electrode to contract or expand.
1 . A battery cell comprising:
a casing having an accommodation space; and
an electrode assembly accommodated in the accommodation space and contacting the casing,
wherein
the electrode assembly comprises:
a negative electrode including a first current collector and a negative electrode mixture applied to the first current collector;
a positive electrode including a second current collector and a positive electrode mixture applied to the second current collector;
a separator interposed between the positive electrode and the negative electrode; and
a guide member accommodating at least one of the negative electrode and the positive electrode and pressurized or stretched by at least one of the negative electrode and the positive electrode to contract or expand, wherein
the guide member comprises:
a first guide member accommodating the negative electrode; and
a second guide member accommodating the positive electrode, and
the separator is disposed between the first guide member and the second guide member.
2 . The battery cell of claim 1 , wherein
the first guide member has a first accommodation groove in which the negative electrode is accommodated,
the second guide member has a second accommodation groove in which the positive electrode is accommodated, and
the first guide member and the second guide member have at least one surface contacting each of the negative electrode and the positive electrode.
3 . The battery cell of claim 2 , wherein
the first guide member and the second guide member include a plurality of first accommodation grooves and a plurality of second accommodation grooves, respectively, and
the negative electrode and the positive electrode are provided with a plurality of negative electrodes and a plurality of positive electrodes corresponding to the first accommodation grooves and the second accommodation grooves in one-to-one correspondence to be accommodated in the first accommodation groove and the second accommodation groove, respectively.
4 . The battery cell of claim 1 , wherein
the first guide member comprises:
a first support portion to which the first current collector is attached; and
a first expansion portion extending from the first support portion in a thickness direction of the negative electrode, and
the second guide member comprises:
a second support portion to which the second current collector is attached; and
a second expansion portion extending from the second support portion in a thickness direction of the positive electrode.
5 . The battery cell of claim 4 , wherein
the first current collector is provided with a plurality of first current collectors to respectively be attached to opposite surfaces of the first support portion, and
the second current collector is provided with a plurality of second current collectors to respectively be attached to opposite surfaces of the second support portion.
6 . The battery cell of claim 5 , wherein
the first expansion portion extends from each of one side and the other side of the first support portion in a thickness direction of the negative electrode, and
the second expansion portion extends from each of one side and the other side of the second support portion in a thickness direction of the positive electrode.
7 . The battery cell of claim 6 , wherein
the first guide member further includes a first lower support portion supporting a lower portion of the negative electrode, and
the second guide member further includes a second lower support portion supporting a lower portion of the positive electrode.
8 . The battery cell of claim 1 ,
wherein
length values of the first guide member and the second guide member in a width direction of the negative electrode are the same, and maximum thickness values of the first guide member and the second guide member in a thickness direction of the negative electrode are the same.
9 . The battery cell of claim 1 , wherein
the first guide member and the second guide member are formed of a material including conductive plastic having porosity of 50% or more to 70% or less.
10 . The battery cell of claim 1 , wherein
the first guide member and the second guide member are formed of a material including polyacetylene.
11 . The battery cell of claim 1 , wherein
the first guide member and the second guide member include a carbon-based filler.
12 . A battery module comprising:
a module housing accommodating the battery cell of claim 1 .
13 . The battery module of claim 12 , wherein
the battery cell is provided with a plurality of battery cells to be stacked in the module housing, and is supported by the module housing.
14 . The battery module of claim 13 , further comprising:
at least one pad disposed between a pair of adjacent battery cells and contacting the pair of adjacent battery cells.
15 . The battery module of claim 12 , wherein
the casing of the battery cell is a pouch casing.
16 . The battery module of claim 14 , wherein
each of the at least one pad is formed of a material having thermal conductivity of 1 W/mK or more to 20 W/mK or less.