KR-102964033-B1 - RECHARGEABLE BATTERY

KR102964033B1KR 102964033 B1KR102964033 B1KR 102964033B1KR-102964033-B1

Abstract

One aspect of the present invention is to provide a secondary battery that increases capacity by reducing the thickness on which electrode terminals are installed and facilitates the connection of a lead tab to the electrode terminals. A secondary battery according to one embodiment of the present invention comprises: an electrode assembly formed by arranging and winding a separator between a first electrode and a second electrode; a case that accommodates the electrode assembly facing one end of the winding of the electrode assembly; a cap plate that seals the opening of the case facing the other end of the winding; an electrode terminal installed by interposing an insulating sealing material in a terminal hole formed in the cap plate; a first lead tab that connects the first electrode to the electrode terminal; and a second lead tab that connects the second electrode to the case.

Inventors

이종하
김유미
전병민

Assignees

삼성에스디아이 주식회사

Dates

Publication Date: 20260511
Application Date: 20190819

Claims (17)

An electrode assembly formed by placing and winding a separator between a first electrode and a second electrode; A case that accommodates the electrode assembly facing one end of the winding of the electrode assembly; A cap plate facing the other end of the above-mentioned winding to seal the opening of the case; An electrode terminal installed by interposing an insulating sealing material in a terminal hole formed in the above-mentioned cap plate; A first lead tab connecting the first electrode to the electrode terminal; and A second lead tab connecting the second electrode to the above case Includes, At least part of the above electrode terminal Each having a first height (h1) and a second height (h2) that are equal to or greater than the first thickness (t1) of the cap plate, The outer circumference of the electrode terminal is connected to the inner surface of the terminal hole with the insulating sealing material, and The above electrode terminal A plate portion having a second thickness (t2) thinner than the first thickness (t1) of the above cap plate, and It includes a double-sided flange portion that protrudes from the outer circumference of the plate portion on both sides in the thickness direction, has a first height (h1), and is connected to the inner surface of the terminal hole with the insulating sealing material. The above first lead tab is a secondary battery connected to the above plate portion by welding.
In paragraph 1, The above insulating sealing material is A secondary battery formed with a glass seal.
In paragraph 1, The above electrode terminal A secondary battery formed of a plate having the same thickness as the above-mentioned cap plate.
In paragraph 1, The first lead tab is connected to the electrode terminal, and The second lead tab above is a secondary battery connected to the case.
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In paragraph 1, The above-mentioned double-sided flange portion A secondary battery formed with a first height (h1=t1) equal to the first thickness of the cap plate.
In paragraph 1, The above second lead tab is a secondary battery connected to the above case by welding.
An electrode assembly formed by placing and winding a separator between a first electrode and a second electrode; A case that accommodates the electrode assembly facing one end of the winding of the electrode assembly; A cap plate facing the other end of the above-mentioned winding to seal the opening of the case; An electrode terminal installed by interposing an insulating sealing material in a terminal hole formed in the above-mentioned cap plate; A first lead tab connecting the first electrode to the electrode terminal; and A second lead tab connecting the second electrode to the above case Includes, The above electrode terminal A plate portion having a third thickness (t3) thinner than the first thickness (t1) of the above cap plate, and It includes a one-sided flange portion that protrudes in one side in the thickness direction from the outer circumference of the plate portion, has a second height (h2), and is connected to the inner surface of the terminal hole with the insulating sealing material. The above first lead tab is a secondary battery connected to the above plate portion by welding.
In paragraph 8, The above-mentioned one-sided flange portion A secondary battery formed with a second height (h2 > t1) greater than the first thickness (t1) of the cap plate.
In Paragraph 9, The above-mentioned one-sided flange portion It is positioned at the center in the thickness direction of the above terminal hole, and The above insulating sealing material is A secondary battery formed with a symmetrical structure on the inner and outer sides along the thickness direction.
In Paragraph 9, The above-mentioned one-sided flange portion It is positioned at the center in the thickness direction of the above terminal hole, and The above terminal hole is It is provided with a projection that protrudes from the center in the thickness direction toward the center in the diameter direction, The above insulating sealing material is A secondary battery that forms a symmetrical structure on the inner and outer sides along the thickness direction while embedding the above-mentioned protrusions.
In Paragraph 9, The above-mentioned one-sided flange portion In the above terminal hole, it is positioned so as to be offset toward the inner surface side rather than the outer surface side of the cap plate, The above plate portion A horizontal plane is formed with the outer surface of the cap plate and arranged in the terminal hole above, and The above insulating sealing material is A secondary battery that forms a horizontal plane with the outer surface of the cap plate and the outer surface of the plate portion, and forms a structure that is offset inward along the thickness direction.
In paragraph 1, A secondary battery further comprising a first insulating member interposed between the second lead tab and the electrode assembly on the bottom side of the case.
In Paragraph 13, A secondary battery further comprising a second insulating member interposed between the first lead tab and the electrode assembly on the side of the cap plate.
In Paragraph 14, A secondary battery further comprising a third insulating member interposed between the first lead tab and the cap plate.
In paragraph 1, The height (H) is set as the minimum distance between the outer planes of the case and the cap plate, and The diameter (D) is set to the maximum distance of the outer circumference of the above case, and A secondary battery in which the ratio of height to diameter is 1 or less (H/D≤1).
In paragraph 1, The above cap plate and the above electrode terminal are A secondary battery formed of stainless steel.

Description

Rechargeable Battery The present invention relates to a secondary battery, and more specifically, to a micro secondary battery. Unlike primary batteries, which cannot be recharged, rechargeable batteries are batteries that can be charged and discharged. Low-capacity rechargeable batteries are used in small portable electronic devices such as mobile phones, laptop computers, and camcorders, while high-capacity batteries are widely used as power sources for motors in hybrid vehicles and the like. Representative rechargeable batteries include nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium-ion (Li-ion) rechargeable batteries. In particular, lithium-ion rechargeable batteries have an operating voltage approximately three times higher than nickel-cadmium or nickel-hydrogen batteries, which are widely used as power sources for portable electronic devices. Additionally, they are widely used due to their high energy density per unit weight. In particular, as the demand for wearable devices such as Bluetooth headphones, earphones, smartwatches, and body-attached medical devices has recently increased, there is a growing need for ultra-small secondary batteries with high energy density. For example, micro secondary batteries include coin cells or button cells. In the case of coin cells or button cells, since the overall height is low, the battery capacity may decrease if the thickness of the portion where the electrode terminals are installed increases. Additionally, because the ends of the bent lead tabs are adjacent to both ends of the electrode assembly, which is wound with a height lower than its diameter, workability for welding the ends of the lead tabs to the electrode terminals may be reduced. FIG. 1 is a disassembled perspective view of a secondary battery according to the first embodiment of the present invention. Figure 2 is a cross-sectional view taken along the line II-II of Figure 1. FIG. 3 is a cross-sectional view of a secondary battery according to a second embodiment of the present invention. FIG. 4 is a disassembled perspective view of a secondary battery according to the third embodiment of the present invention. Figure 5 is a cross-sectional view taken along the line V-V of Figure 4. FIG. 6 is a cross-sectional view of a secondary battery according to the fourth embodiment of the present invention. FIG. 7 is a cross-sectional view of a secondary battery according to the fifth embodiment of the present invention. Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts unrelated to the explanation have been omitted to clearly explain the present invention, and the same reference numerals have been used throughout the specification for identical or similar components. The secondary battery according to an embodiment of the present invention is a micro battery and may be a coin cell or a button cell. Here, a coin cell or a button cell refers to a battery in the shape of a thin coin or button, wherein the ratio of height to diameter (height/diameter) is 1 or less. Coin or button batteries are primarily cylindrical, so their horizontal cross-section is circular; however, they are not limited to this, and shapes with an elliptical or polygonal horizontal cross-section may also be included. In this case, the diameter refers to the maximum distance based on the horizontal direction of the battery, and the height refers to the minimum distance from the flat bottom surface of the battery to the flat top surface of the battery. However, coin-type batteries or button-type batteries are examples of the present invention and are not limited thereto; the present invention may be cylindrical or pin-type batteries. However, the following describes in detail, by way of example, cases where the secondary battery according to an embodiment of the present invention is a coin-type battery or a button-type battery. FIG. 1 is a disassembled perspective view of a secondary battery according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1. Referring to FIG. 1 and FIG. 2, the secondary battery (1) of the first embodiment includes an electrode assembly (10), a case (20), a cap plate (30), an electrode terminal (40), a first lead tab (51), and a second lead tab (52). The electrode assembly (10) includes a first electrode (11, e.g., a negative electrode) and a second electrode (12, e.g., a positive electrode) provided on both sides of a separator (13), which is an electrical insulating material, and is formed by winding the first electrode (11), the separator (13), and the second electrode (12). Accordingly, the electrode assem