Rechargeable battery
One aspect of the present invention is to provide a rechargeable battery that increases capacity and facilitates connection of the lead tab to the electrode terminal by reducing the thickness at which the electrode terminal is installed. A rechargeable battery according to an embodiment of the present invention includes: an electrode assembly formed by disposing and winding a separator between a first electrode and a second electrode; a case facing one of wound ends of the electrode assembly and accommodating the electrode assembly; a cap plate facing the other of the wound ends, and closing and sealing an opening of the case; an electrode terminal installed in a terminal hole formed in the cap plate by interposing an insulating sealing material; a first lead tab connecting the first electrode to the electrode terminal; and a second lead tab connecting the second electrode to the case.
1 . A rechargeable battery comprising:
an electrode assembly formed by disposing and winding a separator between a first electrode and a second electrode;
a case facing one of wound ends of the electrode assembly and accommodating the electrode assembly;
a cap plate facing a second one of the wound ends, and closing and sealing an opening of the case;
an electrode terminal installed in a terminal hole formed in the cap plate by interposing an insulating sealing material, wherein the electrode terminal has a first part and a second part protruded from an exterior circumference of the first part on at least one side in a thickness direction, wherein the second part contacts the insulating sealing material, wherein the second part of the electrode terminal has a first height that is equal or greater than a first thickness (t1) of the cap plate, and the first part of the electrode terminal is formed as a plate and has a second thickness that is thinner than the first thickness of the cap plate:
a first lead tab extending from the first electrode; and
a second lead tab extending from the second electrode.
2 . The rechargeable battery of claim 1 , wherein
the insulating sealing material is formed by a glass seal.
3 . The rechargeable battery of claim 1 , wherein
the first lead tab is connected to the electrode terminal, and
the second lead tab is connected to the case.
4 . The rechargeable battery of claim 1 , further comprising
a first insulating member interposed between the second lead tab and the electrode assembly at the bottom side of the case.
5 . The rechargeable battery of claim 4 , further comprising
a second insulating member interposed between the first lead tab and the electrode assembly at a side of the cap plate.
6 . The rechargeable battery of claim 5 , further comprising a third insulating member interposed between the first lead tab and the cap plate.
7 . The rechargeable battery of claim 1 , wherein
a height H is set as a minimum distance between the outer planes of the case and the cap plate,
a diameter D is set as a maximum distance of the case exterior circumference, and
a ratio of the height to the diameter is 1 or less (H/D≤1).
8 . The rechargeable battery of claim 1 , wherein
the cap plate and the electrode terminal are formed of stainless steel.
9 . The rechargeable battery of claim 1 , wherein
the first electrode includes a first coated portion and a first uncoated portion, and
the second electrode includes a second coated portion and a second uncoated portion, and
wherein the first lead tab extends from the first uncoated portion, and
the second lead tab extends from the second uncoated portion.
10 . The rechargeable battery of claim 1 , wherein
the second part is a both-sided flange part protruded from the exterior circumference of the first part of the electrode terminal formed as the plate to both sides in the thickness direction and connected to the inner surface of the terminal hole with the insulating sealing material with the first height h1.
11 . The rechargeable battery of claim 10 , wherein
the both-sided flange part is formed with a same first height (h1=t1) as the first thickness (t1) of the cap plate.
12 . The rechargeable battery of claim 10 , wherein
the first lead tab is connected to the plate part by welding, and
the second lead tab is connected to the case by welding.
13 . The rechargeable battery of claim 1 , wherein
the second part is a one-sided flange part protruded from the exterior circumference of the plate part to one side in the thickness direction and connected to the inner surface of the terminal hole with the insulating sealing material with a second height h2.
14 . The rechargeable battery of claim 13 , wherein
the one-sided flange part is formed with the second height (h2>t1) that is larger than the first thickness (t1) of the cap plate.
15 . The rechargeable battery of claim 14 , wherein
the one-sided flange part is disposed to be centered in the thickness direction in the terminal hole, and
the insulating sealing material is formed in a symmetrical structure on the inside and outside along the thickness direction.
16 . The rechargeable battery of claim 14 , wherein
the one-sided flange part is disposed to be centered in the thickness direction in the terminal hole,
the terminal hole has a protrusion protruding from the center of the thickness direction toward the center of a diameter direction, and
the insulating sealing material forms a symmetrical structure on the inside and outside along the thickness direction while filling the protrusion.
17 . The rechargeable battery of claim 14 wherein
the one-sided flange part is disposed to be biased to the inner surface side rather than the outer surface of the cap plate at the terminal hole,
the plate part is disposed by forming a horizontal plane with the outer surface of the cap plate in the terminal hole, and
the insulating sealing material forms a horizontal plane with the outer surface of the cap plate and the outer surface of the plate part, and forms a structure that is biased inward along the thickness direction.