US-12626974-B2 - Secondary battery

US12626974B2US 12626974 B2US12626974 B2US 12626974B2US-12626974-B2

Abstract

A secondary battery includes: a cylindrical case; an electrode assembly accommodated in the cylindrical case and including a positive electrode and a negative electrode; and a cap assembly sealing the cylindrical case. The cap assembly includes: a cap-up electrically connected to the positive electrode; a terminal plate coupled to an upper portion of the cap-up and electrically connected to the negative electrode; and a first insulating gasket between the cap-up and the terminal plate.

Inventors

Woo Hyuk Choi
Sung Gwi KO
Myung Seob Kim
Hyun Ki Jung
Gwan Hyeon YU

Assignees

SAMSUNG SDI CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20230127
Priority Date: 20220127

Claims (10)

1 . A secondary battery comprising: a cylindrical case; an electrode assembly accommodated in the cylindrical case and comprising a positive electrode and a negative electrode; and a cap assembly sealing the cylindrical case and comprising: a cap-up electrically connected to the positive electrode; a terminal plate coupled to an upper portion of the cap-up and electrically connected to the negative electrode; and a first insulating gasket between the cap-up and the terminal plate, wherein the cylindrical case has a crimping part bent inwardly at an upper part of the cap assembly, wherein the crimping part covers a portion of the terminal plate and wherein the first insulating gasket is entirely below a side surface of the terminal plate facing toward a center of the cylindrical case.
2 . The secondary battery of claim 1 , wherein the terminal plate is electrically connected to the cylindrical case.
3 . The secondary battery of claim 1 , wherein the cylindrical case has a beading part recessed inwardly at a lower part of the cap assembly.
4 . The secondary battery of claim 1 , wherein the terminal plate is above an edge of the cap-up and exposes a central portion of the cap-up that protrudes upwardly therefrom.
5 . The secondary battery of claim 1 , wherein an area of the terminal plate corresponds to an area of an edge of the cap-up.
6 . The secondary battery of claim 1 , wherein the first insulating gasket is between an edge of the cap-up and the terminal plate, and wherein an area of the first insulating gasket is larger than that of the terminal plate.
7 . The secondary battery of claim 1 , wherein the first insulating gasket comprises an extension part extending upwardly and covering a side surface of the terminal plate nearest to the cylindrical case.
8 . The secondary battery of claim 1 , further comprising a second insulating gasket between the cap-up and the cylindrical case.
9 . The secondary battery of claim 1 , further comprising: a vent plate under the cap-up and having a notch; a cap-down under the vent plate and having a plurality of through holes; and an insulator between the vent plate and the cap-down.
10 . The secondary battery of claim 1 , wherein the cylindrical case has a notch in a bottom surface thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0012600, filed on Jan. 27, 2022, in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference. BACKGROUND 1. Field Aspects of embodiments of the present disclosure relate to a secondary battery. 2. Description of the Related Art Lithium-ion secondary batteries are used as power sources for hybrid vehicles and electric vehicles as well as for portable electronic devices because of, for example, their relatively high operating voltage and relatively high energy density per unit weight. Secondary batteries may be classified as cylindrical, prismatic, or pouch-shaped secondary batteries according to their shape. For example, a cylindrical secondary battery generally includes a cylindrical case, a cylindrical electrode assembly that is coupled to the case, an (optional) electrolyte that is injected into the case to enable movement of lithium ions, and a cap assembly that is coupled to one side of the case to prevent leakage of the electrolyte and to prevent separation of the electrode assembly. 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 prior art. SUMMARY Embodiments of the present disclosure provide a secondary battery that facilitates welding with an external device. A secondary battery, according to an embodiment of the present disclosure, includes: a cylindrical case; an electrode assembly accommodated in the cylindrical case and including a positive electrode and a negative electrode; and a cap assembly sealing the cylindrical case. The cap assembly includes: a cap-up electrically connected to the positive electrode; a terminal plate coupled to an upper portion of the cap-up and electrically connected to the negative electrode; and a first insulating gasket between the cap-up and the terminal plate. The terminal plate may be electrically connected to the cylindrical case. The cylindrical case may have a beading part recessed inwardly at a lower part of the cap assembly and a crimping part bent inwardly at an upper part of the cap assembly, and the crimping part may cover a portion of the terminal plate. The terminal plate may be above an edge of the cap-up and may expose a central portion of the cap-up that protrudes upwardly therefrom. An area of the terminal plate may correspond to an area of an edge of the cap-up. The first insulating gasket may be between an edge of the cap-up and the terminal plate, and an area of the first insulating gasket may be larger than that of the terminal plate. The first insulating gasket may include an extension part extending upwardly and covering a side surface of the terminal plate. The secondary battery may further include a second insulating gasket between the cap-up and the cylindrical case. The secondary battery may further include: a vent plate under the cap-up and having a notch; a cap-down under the vent plate and having a plurality of through holes; and an insulator between the vent plate and the cap-down. The cylindrical case may have a notch in a bottom surface thereof. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a secondary battery according to an embodiment of the present disclosure. FIG. 2 is a cross-sectional view of the secondary battery shown in FIG. 1. FIGS. 3A and 3B are enlarged cross-sectional views of the portion A of FIG. 2 according to embodiments of the present disclosure. FIG. 4 is a cross-sectional view of a secondary battery according to another embodiment of the present disclosure. DETAILED DESCRIPTION Hereinafter, embodiments of the present disclosure will be described, in detail, with reference to the accompanying drawings. Embodiments of the present disclosure are provided to more completely explain aspects and features of the present disclosure to those skilled in the art, but the following embodiments may be modified to have various other forms. Thus, the present disclosure may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will convey the aspects and features of the present disclosure to those skilled in the art. It will be understood that when an element or layer is referred to as being “on,” “connected to,” or “coupled to” another element or layer, it may be directly on, connected, or coupled to the other element or layer or one or more intervening elements or layers may also be present. When an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, there are no intervening elements or layers present. For example, when a first element is desc