KR-102962615-B1 - CAP ASSEMBLY FOR A BATTERY AND BATTERY HAVING THE SAME

KR102962615B1KR 102962615 B1KR102962615 B1KR 102962615B1KR-102962615-B1

Abstract

A cap assembly for a battery according to one aspect of the present invention may include: a lower cap plate configured to be electrically connected to an electrode assembly; a safety vent disposed on the upper portion of the lower cap plate and having a contact plate electrically connected to a contact terminal of the lower cap plate; and an upper cap plate disposed on the upper portion of the safety vent and having an external terminal protruding upward, wherein the safety vent may include a support rim formed in the shape of an annular flat plate; and a disc-shaped recess formed around the contact plate and recessed downward from the center of the support rim, with a fracture notch formed on at least one of an upper surface and a lower surface, and the upper cap plate may include a support flange supported on the upper surface of the support rim; The above external terminal may include a connecting portion that connects the external terminal to the support flange such that the external terminal is positioned higher than the support flange on the recess and the contact plate, and an air hole is formed between the outer surface of the external terminal and the inner surface of the support flange; the lower cap plate may include a central plate formed around the contact terminal and having an exhaust hole formed therein; and the fracture notch may include an arc-shaped outer notch formed along the edge of the recess; a circular inner notch formed along the edge of the contact plate; and an arc-shaped intermediate notch formed between the outer notch and the inner notch.

Inventors

이희준

Assignees

(주)한국 모니터링 시스템

Dates

Publication Date: 20260512
Application Date: 20231004

Claims (9)

A lower cap plate configured to be electrically connected to an electrode assembly; A safety vent having a contact plate disposed on the upper portion of the lower cap plate and electrically connected to a contact terminal of the lower cap plate; and It includes an upper cap plate positioned on the upper part of the above safety vent and having an external terminal protruding upward, The above safety vent is, A support rim formed in the shape of an annular plate; It includes a disc-shaped depression that is sunken downward from the center of the support rim and formed around the contact plate, with a fracture notch formed on at least one of the upper and lower surfaces, and The above lower cap plate is, A base rim located below the above-mentioned support rim; It includes a central plate formed to be recessed downward from the base rim, located below the recessed portion, formed around the contact terminal, and having an exhaust hole formed therein. The above fracture notch is, An arc-shaped outer notch formed along the edge of the above-mentioned depression; A circular inner notch formed along the edge of the contact plate; and It includes an arc-shaped intermediate notch formed between the outer notch and the inner notch, and The exhaust hole is formed on the inner side of the outer notch at a position corresponding to the center of the arc shape of the outer notch and the open part of the arc shape of the middle notch. A battery cap assembly characterized in that the contact terminal protrudes upward from the central plate, and when the fracture notch is not fractured, the electrical connection between the lower cap plate and the safety vent occurs only between the contact terminal and the contact plate.
In Article 1, The above intermediate notch has both ends connected to the above outer notch and the above inner notch, respectively, A battery cap assembly characterized in that the above intermediate notch is connected to the above outer notch and the above inner notch in a continuous shape.
In Article 2, A battery cap assembly characterized in that the outer notch includes first and second outer notches formed with the same length, the middle notch includes first and second middle notches connected to the center of the first and second outer notches, and the arc shapes of the first and second middle notches are open in opposite directions so that the fracture notch is rotationally symmetric with respect to the center of the contact plate.
In Article 1, A battery cap assembly characterized in that at least a portion of the above-mentioned fracture notch has an arc-shaped cross-section at the bottom.
In Article 4, A battery cap assembly characterized in that the cross-section of the above-mentioned fracture notch includes a curved portion and a flatly extended portion.
In Article 1, It further includes an annular insulating ring interposed between the lower cap plate and the safety vent, A battery cap assembly characterized in that the contact terminal contacts the contact plate through the central hole inside the insulating ring.
In Article 1, A battery cap assembly characterized in that the diameter of the inner notch is larger than the diameter of the contact terminal.
In Article 1, A battery cap assembly characterized in that the depth of the inner notch is smaller than the depth of the outer notch and the middle notch.
A battery having a battery cap assembly according to any one of claims 1 to 8.

Description

Cap assembly for a battery and battery having the same The present invention relates to a battery, and more specifically, to a battery cap assembly that improves safety by increasing the reliability of a safety vent, and a battery equipped with the same. Rechargeable batteries, such as lithium-ion batteries, enable recharging and are utilized in various fields, including home appliances and electric vehicles. Cylindrical batteries, which house electrode assemblies wound into a jelly roll shape, can provide particularly high energy density and potential capacity. However, lithium-ion batteries pose a safety risk due to the potential for phenomena such as thermal runaway. Thermal runaway refers to an uncontrollable temperature rise within the battery; if the temperature exceeds a critical threshold, exothermic reactions proceed repeatedly at a high rate, resulting in a significant increase in internal temperature and pressure, which can lead to battery rupture, fire, or even explosion. FIG. 1 is an exploded perspective view illustrating an exemplary battery cap assembly according to an embodiment of the present invention. FIG. 2 is a drawing exemplarily showing a battery cap assembly according to an embodiment of the present invention. FIG. 3 is a plan view exemplarily showing a safety vent of a battery cap assembly according to an embodiment of the present invention. FIG. 4 is a cross-sectional view exemplifying various fracture notch shapes applicable to a safety vent of a battery cap assembly according to an embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. In describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions may obscure the essence of the present invention. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. In describing with reference to the attached drawings, identical or corresponding components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted. For convenience of explanation, expressions such as "inner side," "outer side," "upper side," and "lower side" are used in this specification. In the following description, "inner side" refers to the side closer to the center of the cap assembly (1000), and "outer side" refers to the side further from the center of the cap assembly (1000). Meanwhile, "upper side" and "lower side" are based on the case where the cap assembly (1000) is positioned as shown in FIG. 2 (b). Of course, when the battery cap assembly (1000) according to an embodiment of the present invention is actually used, the upper direction mentioned in the specification may not coincide with the actual upper direction. FIG. 1 is an exploded perspective view exemplarily showing a cap assembly (1000) for a battery according to an embodiment of the present invention. FIG. 2 is a drawing exemplarily showing a cap assembly (1000) for a battery according to an embodiment of the present invention, where FIG. 2(a) is a plan view of the cap assembly (1000) excluding the gasket (500), and FIG. 2(b) is a cross-sectional view cut along line A-A of the plan view. FIG. 3 is a plan view exemplarily showing a safety vent (100) of a cap assembly (1000) for a battery according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view exemplarily showing various shapes of fracture notches (150) applicable to the safety vent (100) of a cap assembly (1000) for a battery according to an embodiment of the present invention. One aspect of the present invention provides a cap assembly (1000) for a battery, and ano