Battery module
Embodiments of the present disclosure relate to a battery module. According to an embodiment of the present disclosure, there is provided a battery module including a plurality of battery cells each including at least one electrode tab, and a bus bar in contact with the electrode tabs to electrically connect the plurality of battery cells, wherein the bus bar includes a plate in which a plurality of holes are formed, and the electrode tabs are inserted into at least a portion of the plurality of holes to electrically connect the plurality of battery cells.
1 . A method for manufacturing a battery module, comprising:
preparing a plurality of battery cells and at least one bus bar, each of the plurality of battery cells including at least one electrode tab and each bus bar including a plurality of holes;
forming the at least one electrode tab to have a first straight portion, a second straight potion in linear alignment with the first straight portion, and a bent portion connecting the first straight portion and the second straight portion, wherein the bent portion protrudes from the straight portions in a thickness direction of the at least one electrode tab;
inserting the second straight portion of each of the at least one electrode tab into each of the holes; and
welding the at least one electrode tab to the bus bar by applying a laser to the at least one electrode tab protruding from the corresponding holes of the bus bar.
2 . The method of claim 1 , wherein the bent portion is electrically insulated.
3 . The method of claim 2 , wherein the bent portion forms a front surface and a rear surface, wherein one of the front surface and the rear surface is concave, and wherein another of the front surface and the rear surface is convex.
4 . The method of claim 1 , wherein forming each of the at least one electrode tab includes forming a chamfer portion at a portion of an edge of each of the at least one electrode tab.
5 . The method of claim 1 , wherein the straight portion extends from the bent portion, wherein the straight portion is inserted into the hole of the bus bar, and wherein the straight portion is welded to the bus bar.
6 . The method of claim 1 , wherein each of the at least one electrode tab is welded to the bus bar by wobble type.
7 . The method of claim 1 , further comprising forming the bus bar, wherein the bus bar includes a plate and the holes being formed on the plate at predetermined intervals.
8 . The method of claim 7 , wherein each of the holes is narrower outward from an inner surface of the plate, wherein the inner surface of the plate faces the battery cells.
9 . The method of claim 7 , wherein the bus bar includes a protruding portion formed on the plate, wherein the protruding portion is positioned at a periphery of each of the holes.
10 . The method of claim 1 , wherein the preparing a plurality of battery cells including forming the at least one electrode tab extended from each of the battery cells, and wherein each of the at least one electrode tab has a bent portion and a straight portion.
11 . The method of claim 10 , wherein the bent portion is under the holes of the bus bar, and the straight portion is upper the holes of the bus bar, wherein the laser is applied to the straight portion.
12 . The method of claim 1 , wherein welding each of the at least one electrode tab to the bus bar includes applying the laser obliquely with respect to a central axis of each of the at least one electrode tab.
13 . The method of claim 1 , wherein each of the at least one electrode tab and the bus bar are coupled after each of the at least one electrode tab melts,
wherein each of the at least one electrode tab melted by the laser is electrically connected to the bus bar.
14 . A method for manufacturing a battery module, comprising:
forming an electrode tab extended from a battery cell, the electrode tab having a bent portion and a straight portion;
inserting the electrode tab into a hole of a bus bar; and
securing the electrode tab to the bus bar, and
assembling a bus bar assembly, wherein the bus bar assembly includes the bus bar, a support plate, and a fixing plate.
15 . The method of claim 14 , wherein assembling the bus bar assembly includes:
placing the bus bar between the support plate and the fixing plate; and
fixing the fixing plate to the support plate.
16 . The method of claim 15 , wherein the electrode tab is inserted into the support plate, the bus bar, and the fixing plate, sequentially.
17 . A method for manufacturing a battery module, comprising:
preparing a plurality of battery cells and at least one bus bar, each of the plurality of battery cells including at least one electrode tab and each bus bar including a plurality of holes;
inserting each of the at least one electrode tab into each of the holes; and
welding the at least one electrode tab to the bus bar by applying a laser only to the at least one electrode tab protruding from the corresponding holes of the bus bar, and
assembling a bus bar assembly, wherein the bus bar assembly includes the bus bar, a support plate, and a fixing plate.
18 . The method of claim 17 , wherein assembling the bus bar assembly includes:
placing the bus bar between the support plate and the fixing plate; and
fixing the fixing plate to the support plate.
19 . The method of claim 18 , wherein each of the at least one electrode tab is inserted into the support plate, the bus bar, and the fixing plate, sequentially.