US-20260128429-A1 - SECONDARY BATTERY

US20260128429A1US 20260128429 A1US20260128429 A1US 20260128429A1US-20260128429-A1

Abstract

A secondary battery includes an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode, a receiving can accommodating the electrode assembly, the receiving can having one opening, and a cap assembly sealing the one opening of the receiving can, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab, wherein the cap assembly includes a cap plate including a first terminal hole through which the first electrode terminal is exposed to the outside, and a second terminal hole through which the second electrode terminal is exposed to the outside.

Inventors

Dong Sik MOON
Taewon Kim
Myongho LEE

Assignees

SAMSUNG SDI CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20250515
Priority Date: 20241107

Claims (20)

1 . A secondary battery, comprising: an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode; a receiving can accommodating the electrode assembly, the receiving can having one opening; and a cap assembly sealing the one opening of the receiving can, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab, wherein the cap assembly includes a cap plate including a first terminal hole through which the first electrode terminal is exposed to the outside, and a second terminal hole through which the second electrode terminal is exposed to the outside.
2 . The secondary battery as claimed in claim 1 , wherein: the cap assembly includes a cap insulating layer including a first through hole corresponding to the first terminal hole and a second through hole corresponding to the second terminal hole, and insulating a space between the first electrode terminal and the second electrode terminal and the cap plate, and the first electrode terminal is exposed through the first terminal hole and the first through hole, and the second electrode terminal is exposed through the second terminal hole and the second through hole.
3 . The secondary battery as claimed in claim 2 , wherein the first electrode terminal and the second electrode terminal are spaced apart from each other.
4 . The secondary battery as claimed in claim 2 , wherein the first electrode terminal includes: a bottom portion connected to the first electrode tab; and a terminal portion protruding from the bottom portion and exposed through the first terminal hole and the first through hole, and wherein the second electrode terminal includes: a bottom portion connected to the second electrode tab; and a terminal portion protruding from the bottom portion and exposed through the second terminal hole and the second through hole.
5 . The secondary battery as claimed in claim 4 , wherein: a recessed area having a step around the first through hole and a recessed area having a step around the second through hole are in the cap insulating layer, a bottom portion of the first electrode terminal is in contact with the recessed area around the first through hole, and a bottom portion of the second electrode terminal is in contact with the recessed area around the second through hole.
6 . The secondary battery as claimed in claim 2 , wherein the receiving can and the cap plate are electrically insulated from the first electrode and the second electrode.
7 . The secondary battery as claimed in claim 2 , wherein the receiving can and the cap plate include a same material.
8 . The secondary battery as claimed in claim 7 , wherein the receiving can and the cap plate include a polymer material.
9 . The secondary battery as claimed in claim 8 , wherein the receiving can and the cap plate are heat-fusion connected.
10 . The secondary battery as claimed in claim 7 , wherein the receiving can and the cap plate include a metal material.
11 . The secondary battery as claimed in claim 10 , wherein the receiving can and the cap plate are metal-bonding connected.
12 . The secondary battery as claimed in claim 10 , further comprising a first insulating member disposed to surround a bottom surface and a side surface of an inside of the receiving can.
13 . The secondary battery as claimed in claim 1 , wherein the second electrode tab is bent and connected to the second electrode terminal.
14 . The secondary battery as claimed in claim 13 , further comprising a second insulating member insulating the second electrode tab, wherein a bent first side of the second electrode tab is connected to the second electrode terminal, and wherein a bent second side of the second electrode tab is insulated from the first electrode by the second insulating member.
15 . The secondary battery as claimed in claim 3 , wherein the first terminal hole and the second terminal hole have shapes that are symmetrical to each other.
16 . The secondary battery as claimed in claim 15 , wherein the first terminal hole and the second terminal hole have shapes that are axisymmetric to each other.
17 . The secondary battery as claimed in claim 3 , wherein the cap plate further includes a bridge portion between the first terminal hole and the second terminal hole.
18 . The secondary battery as claimed in claim 17 , wherein the bridge portion has a bar shape.
19 . The secondary battery as claimed in claim 1 , wherein the first electrode terminal includes at least one of steel use stainless and nickel.
20 . The secondary battery as claimed in claim 1 , wherein the second electrode terminal includes aluminum.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority under 35 USC § 119 to Korean Patent Application No. 10-2024-0156902, filed in the Korean Intellectual Property Office on Nov. 7, 2024, the entire contents of which are hereby incorporated by reference. BACKGROUND 1. Field The present disclosure relates to a secondary battery and a method for manufacturing the same. 2. Description of Related Art Recently, as the demand for wearable devices such as headphones, earphones, smart watches, and body-attached medical devices using Bluetooth increases, the demand for secondary batteries with a high energy density and a sufficiently small size is also increasing. Such a secondary battery is manufactured in a form that accommodates an electrode assembly in a circular can of which a height is significantly less than a width depending on characteristics of a usage environment, and may be referred to as a coin cell or a button cell. The above information disclosed in this Background section is for enhancement of understanding of the background of the present disclosure, and therefore, it may contain information that does not constitute related (or prior) art. SUMMARY Embodiments include a secondary battery, including an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode, a receiving can accommodating the electrode assembly, the receiving can having one opening, and a cap assembly sealing the one opening of the receiving can, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab, wherein the cap assembly includes a cap plate including a first terminal hole through which the first electrode terminal is exposed to the outside, and a second terminal hole through which the second electrode terminal is exposed to the outside. The cap assembly may include a cap insulating layer including a first through hole corresponding to the first terminal hole and a second through hole corresponding to the second terminal hole, and may insulate a space between the first electrode terminal and the second electrode terminal and the cap plate, and the first electrode terminal may be exposed through the first terminal hole and the first through hole, and the second electrode terminal may be exposed through the second terminal hole and the second through hole. The first electrode terminal and the second electrode terminal may be spaced apart from each other. The first electrode terminal may include a bottom portion connected to the first electrode tab, and a terminal portion protruding from the bottom portion and exposed through the first terminal hole and the first through hole, and wherein the second electrode terminal may include a bottom portion connected to the second electrode tab, and a terminal portion protruding from the bottom portion and exposed through the second terminal hole and the second through hole. A recessed area having a step around the first through hole and a recessed area having a step around the second through hole may be in the cap insulating layer, a bottom portion of the first electrode terminal may be in contact with the recessed area around the first through hole, and a bottom portion of the second electrode terminal may be in contact with the recessed area around the second through hole. The receiving can and the cap plate may be electrically insulated from the first electrode and the second electrode. The receiving can and the cap plate may include a same material. The receiving can and the cap plate may include a polymer material. The receiving can and the cap plate may be heat-fusion connected. The receiving can and the cap plate may include a metal material. The receiving can and the cap plate may be metal-bonding connected. The secondary battery may further include a first insulating member disposed to surround a bottom surface and a side surface of an inside of the receiving can. The second electrode tab may be bent and connected to the second electrode terminal. The secondary battery may further include a second insulating member insulating the second electrode tab, wherein a bent first side of the second electrode tab may be connected to the second electrode terminal, and wherein a bent second side of the second electrode tab may be insulated from the first electrode by the second insulating member. The first terminal hole and the second terminal hole may have shapes that are symmetrical to each other. The first terminal hole and the second terminal hole may have shapes that are axisymmetric to each other. The cap plate may further include a bridge portion between the first terminal hole and the second terminal hole. The bridge portion may have a bar shape. The first electrode termina