Battery module with reinforced safety
A battery module has an improved structure to control the discharge of a flame generated in the battery module. A battery pack and a vehicle can include the battery module. The battery module includes a cell assembly having a plurality of battery cells stacked side by side and having a taping member partially attached to at least a top sealing portion; a module terminal electrically connected to the cell assembly; and a module case configured to have an outer side at which the module terminal is installed, accommodate the cell assembly in an inner space thereof, and have a top hole communicating with the inner space and formed at an upper side thereof. At the top of the cell assembly, at least a part of an unattached region of the taping member is located in a portion where the top hole is formed.
1 . A battery module, comprising:
a cell assembly having a plurality of battery cells stacked side by side in a left and right direction, each battery cell having a battery case and an electrode assembly in the battery case, the battery case having a front end sealing portion and a rear end sealing portion and a top sealing portion extending between the front end sealing portion and the rear end sealing portion, a pair of electrode leads extending from the battery case and having at least one taping member partially attached to an exterior surface of the top sealing portion, an area of the top sealing portion not having the at least one taping member being an unattached region;
a module terminal electrically connected to the cell assembly; and
a module case configured to have an outer side at which the module terminal is installed, accommodate the cell assembly in an inner space thereof, and have at least one top hole communicating with the inner space and formed at an upper side thereof,
wherein at least a part of the unattached region is under the at least one top hole, and
wherein the at least one taping member is attached to an exterior surface of the top sealing portion.
2 . The battery module according to claim 1 , wherein the module terminal is located at a front side of the module case.
3 . The battery module according to claim 1 , wherein the at least one taping member is a plurality of taping members, and the plurality of taping members are spaced apart in a front and rear direction at the top sealing portion of at least one battery cell of the plurality of battery cells.
4 . The battery module according to claim 3 , wherein at least a part of the at least one top hole exposes a portion between the plurality of taping members.
5 . The battery module according to claim 1 , wherein the at least one top hole is configured such that, at the top of the cell assembly, the unattached region is exposed more than the taping member.
6 . The battery module according to claim 1 , wherein the module case is configured such that the at least one top hole is located above all of the plurality of battery cells.
7 . The battery module according to claim 1 , further comprising a thermistor configured to measure a surrounding temperature and disposed at an upper side of the at least one taping member.
8 . The battery module according to claim 1 , further comprising a top cover made of an electrical insulation material, interposed between an upper portion of the cell assembly and the module case, and having at least one cover hole aligned with the at least one top hole.
9 . The battery module according to claim 8 , wherein the at least one cover hole is a plurality of cover holes having a smaller size than the at least one top hole, the plurality of cover holes being disposed to correspond to the at least one top hole.
10 . The battery module according to claim 9 , wherein the plurality of cover holes is formed with a honeycomb structure.
11 . The battery module according to claim 8 , further comprising a printed circuit board interposed between the cell assembly and the top cover and configured to transmit an electrical signal for the cell assembly,
wherein the top cover is configured such that the at least one cover hole is not aligned with the printed circuit board.
12 . The battery module according to claim 11 , wherein the module case is configured such that the at least one top hole is aligned with the upper side of the printed circuit board.
13 . The battery module according to claim 1 , further comprising a blocking cover located at an outer side of the module case and configured to open and close the at least one top hole according to an internal pressure of the module case.
14 . The battery module according to claim 13 , further comprising a spacer disposed at the top of the blocking cover.
15 . A battery pack, comprising the battery module according to claim 1 .
16 . A vehicle, comprising the battery module according to claim 1 .
17 . A battery module, comprising:
a cell assembly having a plurality of battery cells stacked in a first direction, each battery cell having a battery case and an electrode assembly in the battery case, the battery case having a front end sealing portion and a rear end sealing portion and a top sealing portion extending between the front end sealing portion and the rear end sealing portion and having at least one taping member attached to the top sealing portion of each of the plurality of battery cells, an area of the top sealing portion not having the at least one taping member being an unattached region;
a module case configured accommodate the cell assembly in an inner space thereof; and
a plurality of top holes formed at an upper side of the module case,
wherein the plurality of top holes are arranged in rows spaced from each other in a first direction, wherein top holes of adjacent rows are offset from each other so as not to be aligned in the first direction so that a portion of each of the plurality of battery cells is exposed,
wherein the at least one taping member is a plurality of taping members, and
wherein the plurality of taping members are attached with different bonding strengths.
18 . The battery module of claim 17 , wherein taping members of the plurality of taping members closer to an end of each of the plurality of battery cells have a higher bonding strength than taping members of the plurality of taping members further from the end of each of the plurality of battery cells.
19 . The battery module of claim 17 , further comprising a blocking cover on the upper side of the module case, the blocking cover having a plurality of opening and closing portions aligned with the plurality of top holes, the plurality of opening and closing portions rupturing when internal pressure of the module case exceeds a predetermined value.