Assembled battery and manufacturing method of assembled battery
An assembled battery has improved reliability by facilitating and strengthening adhesive fixation of battery cells to a holder and a case and by accurately positioning electrode terminals. The assembled battery includes a battery cell ( 150 ) having a cap surface ( 151 ) and an opposing can bottom ( 155 ), a holder ( 120 ) holding the battery cell ( 150 ), a case ( 110 ) that engages with the holder ( 120 ) and houses the battery cell ( 150 ) together with the holder ( 120 ), a first adhesive portion ( 170 ) adhering the battery cell ( 150 ) to the holder ( 120 ), and a second adhesive portion ( 180 ) adhering the battery cell ( 150 ) to the case ( 110 ). The first adhesive portion ( 170 ) is provided between edges of the cap surface ( 151 ) and corresponding portions of the holder ( 120 ), and the second adhesive portion ( 180 ) is provided between a substantially central portion of the can bottom ( 155 ) and a corresponding portion of the case ( 110 ).
1. A manufacturing method of an assembled battery in which a battery cell is housed in a holder and a case, the battery cell comprising a cap surface and a can bottom opposing the cap surface, the manufacturing method comprising:
turning the holder upside down;
pointing the cap surface downwards;
inserting the battery cell to the holder turned upside down with the cap surface pointed downwards;
adhering the battery cell to the holder with a first adhesive portion;
engaging the case with the holder so as to cover the holder in which the battery cell is inserted with the case turned upside down; and
adhering the battery cell to the case with a second adhesive portion;
wherein the first adhesive portion is provided between an edge of the cap surface and a corresponding portion of the holder, and the second adhesive portion is provided between a substantially central portion of the can bottom and a corresponding portion of the case; and
wherein a thickness of the second adhesive portion is greater than a thickness of the first adhesive portion.
2. The manufacturing method of the assembled battery of claim 1 , wherein the first adhesive portion and the second adhesive portion are formed by adhesive applied on the battery cell side.
3. The manufacturing method of the assembled battery of claim 1 , wherein the first adhesive portion and the second adhesive portion are linear.
4. The manufacturing method of the assembled battery of claim 3 , wherein a length of the first adhesive portion is greater than a length of the second adhesive portion.
5. The manufacturing method of the assembled battery of claim 1 , wherein the first adhesive portion is provided between the cap surface and a corresponding portion of the holder and between a portion of a surface perpendicular to the cap surface and a corresponding portion of the holder, and the second adhesive portion is provided between the can bottom and a corresponding portion of the case and between a portion of a surface perpendicular to the can bottom and a corresponding portion of the case.
6. The manufacturing method of the assembled battery of claim 2 , wherein the first adhesive portion is provided between the cap surface and a corresponding portion of the holder and between a portion of a surface perpendicular to the cap surface and a corresponding portion of the holder, and the second adhesive portion is provided between the can bottom and a corresponding portion of the case and between a portion of a surface perpendicular to the can bottom and a corresponding portion of the case.