Rechargeable battery

Abstract

The rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case connected to the first electrode to accommodate the electrode assembly, and including an opening through which the electrode assembly is exposed; a cover plate coupled with the housing so as to cover a peripheral region of the opening, and including a through hole through which a central region of the opening is exposed; and a terminal plate connected to the second electrode to be insulated from and coupled to the cap plate, and including a flange member covering the through hole and a protruding member penetrating the through hole from the flange member.

Description

[0001] This application is a divisional application of the invention patent application filed on July 7, 2021, with application number 202180007469.6 and invention title "Rechargeable Battery". Technical Field

[0002] This disclosure pertains to rechargeable batteries. Background Technology

[0003] Generally speaking, rechargeable batteries are batteries that can be repeatedly charged and discharged.

[0004] In recent years, with the increasing demand for wearable devices that use wireless communication (such as Bluetooth), such as headphones, earbuds, smartwatches, and personal medical devices, the need for ultra-small rechargeable batteries installed in wearable devices is growing.

[0005] This ultra-small rechargeable battery includes: an electrode assembly comprising two electrodes; a housing housing the electrode assembly and connected to one electrode of the electrode assembly; and a terminal plate sealing the electrode assembly together with the housing and connected to the other electrode of the electrode assembly. Summary of the Invention

[0006] An exemplary embodiment provides a rechargeable battery that includes a terminal plate that, together with a housing, tightly seals an electrode assembly and is simultaneously securely connected to the electrodes of the electrode assembly.

[0007] One aspect provides a rechargeable battery comprising: an electrode assembly including a first electrode, a second electrode, and a separator between the first and second electrodes; a housing connected to the first electrode to receive the electrode assembly and including an opening to expose the electrode assembly; a cover plate coupled to the housing to cover a peripheral area of ​​the opening and including a through-hole to expose a central area of ​​the opening; and a terminal plate connected to the second electrode to be insulated from and coupled to the cover plate, and including a flange member covering the through-hole and a protrusion extending through the through-hole from the flange member, wherein the diameter of the protrusion is in a ratio of 2 / 25 to 3 / 5 to the diameter of the flange member.

[0008] The rechargeable battery may further include a thermally bonded layer between the cover plate and the flange component, which insulates and bonds the cover plate and the flange component together.

[0009] The thermally bonded layer can be melted at a predetermined temperature.

[0010] The flange component can be arranged on the cover plate, and the protruding component can be connected to the second electrode from the flange component through a through hole.

[0011] The electrode assembly may further include: a first electrode tab extending from the first electrode and welded to the housing; and a second electrode tab extending from the second electrode and welded to a protruding part of the terminal block.

[0012] Flange components can have a larger area than protruding components.

[0013] Flange components can have a thinner thickness than protruding components.

[0014] Flange components and protruding components can be formed as a single piece.

[0015] The housing and cover may have the same polarity as the first electrode, and the terminal plate may have the same polarity as the second electrode.

[0016] The diameter of the flange component can be smaller than the diameter of the shell.

[0017] The ratio of the diameter of the protruding component to the diameter of the flange component can be from 1 / 10 to 3 / 5.

[0018] The ratio of the diameter of the protruding component to the diameter of the flange component can be 1 / 10 to 1 / 2.

[0019] The ratio of the diameter of the protruding component to the diameter of the flange component can be 1 / 10 to 1 / 3.

[0020] Rechargeable batteries may include coin cells or button cells.

[0021] The height-to-diameter ratio (height / diameter) of a coin-shaped or button-shaped battery can be 1 or less.

[0022] Another aspect provides a rechargeable battery comprising: an electrode assembly including a first electrode, a second electrode, and a separator between the first and second electrodes; a housing connected to the first electrode to house the electrode assembly and including an opening to expose the electrode assembly; a cover plate coupled to the housing to cover a peripheral area of ​​the opening and including a through-hole to expose a central area of ​​the opening; and a terminal plate connected to the second electrode to be insulated from and coupled to the cover plate, and including a flange member covering the through-hole and a protrusion extending through the through-hole from the flange member, wherein the diameter of the protrusion is in a ratio of 2 / 25 or greater to the diameter of the flange member.

[0023] The ratio of the diameter of the protruding part to the diameter of the flange part can be 3 / 5 or less.

[0024] The ratio of the diameter of the protruding part to the diameter of the flange part can be 1 / 2 or less.

[0025] The ratio of the diameter of the protruding part to the diameter of the flange part can be 1 / 3 or less.

[0026] According to one embodiment, a rechargeable battery is provided, which includes a terminal plate that securely seals an electrode assembly together with a housing and is simultaneously securely connected to the electrodes of the electrode assembly. Attached Figure Description

[0027] Figure 1 This is a perspective view of a rechargeable battery according to an embodiment.

[0028] Figure 2 It is along Figure 1 The cross-sectional view taken from line II-II.

[0029] Figure 3 The first table shows experimental examples illustrating the effects of a rechargeable battery according to an embodiment.

[0030] Figure 4 The second table shows experimental examples illustrating the effects of the rechargeable battery according to the embodiments.

[0031] <Explanation of Figure Markers>

[0032] Electrode assembly 100, housing 200, cover plate 300, terminal plate 400, flange component 410, protruding component 420 Detailed Implementation

[0033] The invention will now be described more fully with reference to the accompanying drawings, which illustrate exemplary embodiments of the invention. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention.

[0034] Furthermore, unless explicitly stated otherwise, the word “comprise” and its variations such as “comprises” or “comprising” will be understood to imply the inclusion of the specified elements, but not to exclude any other elements.

[0035] The following text is for reference only. Figure 1 and Figure 2 Describes a rechargeable battery according to an embodiment.

[0036] According to one embodiment, the rechargeable battery is an ultra-small rechargeable battery, and can be a coin-shaped battery or a button-shaped battery, but is not limited thereto. In another embodiment, it can be a cylindrical or needle-shaped battery.

[0037] Here, coin-type or button-type batteries refer to thin coin-type or button-type batteries, and may refer to batteries with a height-to-diameter ratio of 1 or less, but are not limited thereto. In embodiments, coin-type or button-type batteries are primarily cylindrical with a circular horizontal cross-section, but the invention is not limited thereto, and in other embodiments, the horizontal cross-section may be elliptical or polygonal. In this case, the diameter may refer to the maximum distance in the horizontal direction based on the battery, and the height may refer to the maximum distance in the vertical direction based on the battery (the distance from the flat bottom surface to the flat top surface).

[0038] Figure 1 This is a perspective view of a rechargeable battery according to an embodiment. Figure 2 It is along Figure 1 The cross-sectional view taken from line II-II.

[0039] See Figure 1 and Figure 2 According to an embodiment, the rechargeable battery 1000 includes an electrode assembly 100, a housing 200, a cover plate 300, a terminal plate 400, and a thermal fusion layer 500.

[0040] Electrode assembly 100 is housed within housing 200. The lower portion of electrode assembly 100 faces the lower portion of housing 200, and the upper portion of electrode assembly 100 faces a cover plate 300 and a terminal plate 400 that cover the opening 210 of housing 200. In embodiments, the upper and lower portions of electrode assembly 100 may each have a planar shape and may be parallel to each other, but are not limited thereto.

[0041] The electrode assembly 100 includes a first electrode 110, a second electrode 120, a partition 130, a first electrode connector 140, and a second electrode connector 150.

[0042] The first electrode 110 and the second electrode 120 are separated from each other, and a partition 130 including insulating material is disposed between the first electrode 110 and the second electrode 120. The first electrode 110 may be a negative electrode and the second electrode 120 may be a positive electrode, but this disclosure is not limited thereto, and the first electrode 110 may be a positive electrode and the second electrode 120 may be a negative electrode.

[0043] The first electrode 110 has a strip extending in one direction and includes a negative electrode coated region and a negative electrode uncoated region. The negative electrode coated region is the area of ​​the current collector in which a negative electrode active material layer is coated onto a metal foil (e.g., a Cu foil), and the negative electrode uncoated region is the area in which no active material is coated. The negative electrode uncoated region may be located at one end of the extending direction of the first electrode 110.

[0044] The second electrode 120 is strip-shaped and spaced apart from the first electrode 110, with a separator 130 inserted therebetween and extending in one direction. It includes a positive electrode coated region and a positive electrode uncoated region. The positive electrode coated region is the area of ​​the current collector where a positive electrode active material layer is coated onto a metal foil (e.g., an Al foil), and the positive electrode uncoated region is the area where no active material is coated. The positive electrode uncoated region may be located at one end of the extending direction of the second electrode 120.

[0045] The partition 130 extends in one direction between the first electrode 110 and the second electrode 120 to prevent a short circuit between the first electrode 110 and the second electrode 120.

[0046] The first electrode 110, the partition 130, and the second electrode 120 are stacked and wound in sequence into a jelly roll shape, but are not limited thereto, and can be formed in any of the various known shapes. Each of the first electrode 110, the second electrode 120, and the partition 130 may include any of the various known materials.

[0047] A first electrode tab 140 extends from the first electrode 110 of the electrode assembly 100 to the housing 200. The first electrode tab 140 engages with the lower portion of the housing 200 to connect the first electrode 110 and the housing 200. The first electrode tab 140 contacts both the first electrode 110 and the housing 200. The first electrode tab 140 is welded to the lower portion of the housing 200, but is not limited thereto. Through the first electrode tab 140, the housing 200 has the same polarity as the first electrode 110.

[0048] The second electrode tab 150 extends from the second electrode 120 of the electrode assembly 100 to the terminal plate 400. The second electrode tab 150 engages with a protruding portion 420 of the terminal plate 400 to connect the second electrode 120 and the terminal plate 400. The second electrode tab 150 contacts both the second electrode 120 and the terminal plate 400. The second electrode tab 150 is soldered to the surface of the protruding portion 420 of the terminal plate 400, but is not limited thereto. The terminal plate 400 has the same polarity as the second electrode 120 via the second electrode tab 150.

[0049] Meanwhile, a central pin can be provided in the center of the electrode assembly 100, penetrating the center of the electrode assembly 100 in a vertical direction, and the central pin can support the first electrode terminal 140 and the second electrode terminal 150.

[0050] However, since the center pin can be removed during the assembly of the rechargeable battery, therefore... Figure 2 As shown, the center of the electrode assembly 100 may not have a center pin.

[0051] Each of the first electrode tab 140 and the second electrode tab 150 protrudes from the outer peripheral end of the electrode assembly 100 in the form of a jelly roll, but is not limited thereto, and may protrude from the center of the electrode assembly 100 in the form of a jelly roll, or protrude from a portion between the center and the outer peripheral end of the electrode assembly 100 in the form of a jelly roll.

[0052] The housing 200 is connected to and houses the first electrode 110 of the electrode assembly 100. The housing 200 includes an opening 210 exposing the upper portion of the electrode assembly 100. The lower portion of the housing 200 is welded to and connected to the first electrode 110 of the electrode assembly 100 via the first electrode tab 140, thus the housing 200 has the same polarity as the first electrode 110. The housing 200 is a cylindrical container for housing the jelly roll-shaped electrode assembly 100, but is not limited thereto, and can have any of various known shapes. The housing 200 can contain any of various known electrolyte solutions together with the electrode assembly 100. The outer surface of the housing 200 can be, but is not limited thereto, the first electrode terminal of the rechargeable battery 1000. In this case, the upper surface of the flange member 410 (i.e., the outer surface of the terminal plate 400) can be, but is not limited thereto, the second electrode terminal of the rechargeable battery 1000. Simultaneously, a plating can be applied to the outer surface of the housing 200, but this disclosure is not limited thereto, and various known coatings can be applied to the outer surface of the housing 200.

[0053] The opening 210 of the housing 200 is covered by the cover plate 300 and the terminal plate 400.

[0054] Cover 300 is coupled to housing 200 to cover the peripheral area of ​​opening 210. Cover 300 includes a through-hole 310 exposing the central area of ​​opening 210. Cover 300 is directly coupled to the sidewall of housing 200 forming opening 210 of housing 200 by a welding process to cover the peripheral area of ​​opening 210. Cover 300 is annular due to the centrally formed through-hole 310, but is not limited thereto. Cover 300 is coupled to housing 200 and has the same polarity as the first electrode 110. Cover 300 includes stainless steel, but is not limited thereto, and may include metals such as any aluminum, nickel, and copper. The outer surface of cover 300 may be, but is not limited thereto, the first electrode terminal of rechargeable battery 1000. An insulating member (not shown) (e.g., various known insulating layers) may be placed on the lower surface of cover 300, which contacts a configuration with different polarities for preventing short circuits (e.g., adjacent second electrode terminals 150).

[0055] Meanwhile, a coating may be applied to the outer surface of the cover plate 300, but not limited to this, and any known coating may be applied to the outer surface of the cover plate 300.

[0056] Terminal plate 400 is connected to the second electrode 120 to insulate from and engage with cover plate 300. Terminal plate 400 covers the through hole 310 of cover plate 300. Terminal plate 400 is disposed on cover plate 300. Terminal plate 400 covers the central area of ​​opening 210 of housing 200 exposed through the through hole 310 of cover plate 300. Since terminal plate 400 covers the central area of ​​opening 210 and cover plate 300 covers the peripheral area of ​​opening 210, opening 210 of housing 200 is completely covered by terminal plate 400 and cover plate 300. Terminal plate 400, together with housing 200, cover plate 300 and thermal fusion layer 500, tightly seals electrode assembly 100. Terminal plate 400 is coupled to second electrode terminal piece 150 of electrode assembly 100 to connect with second electrode 120 of electrode assembly 100. Terminal plate 400 has the same polarity as second electrode 120.

[0057] Terminal block 400 includes flange component 410 and protruding component 420.

[0058] A flange component 410 is disposed on and overlaps the cover plate 300 to cover the through hole 310. The flange component 410 has a larger area than the protruding component 420. The flange component 410 may have a larger diameter than the protruding component 420. The upper surface of the flange component 410 is smaller than a first diameter D1 and has a second diameter D2, where the first diameter D1 is the outer diameter of the housing 200, and the second diameter D2 is larger than a third diameter D3, where the third diameter D3 is the outer diameter of the lower surface of the protruding component 420. The flange component 410 has a thinner thickness than the protruding component 420, but is not limited thereto. The lower surface of the flange component 410 contacts the heat-fused layer 500, and the flange component 410 is insulatedly bonded to the cover plate 300 through the heat-fused layer 500. The upper surface of the flange component 410 may be a second electrode terminal of the rechargeable battery 1000.

[0059] A protruding member 420 protrudes from a flange member 410 and penetrates a through-hole 310. The protruding member 420 connects to the second electrode 120 from the flange member 410 through the through-hole 310. The lower surface of the protruding member 420 is coupled to the second electrode tab 150. The lower surface of the protruding member 420 may be welded to the second electrode tab 150, but is not limited thereto. Because the protruding member 420 is coupled to the second electrode tab 150, the protruding member 420 and the flange member 410 of the terminal block 400 have the same polarity as the second electrode 120. The lower surface of the protruding member 420 coupled to the second electrode tab 150 may have a smaller diameter than the upper surface of the flange member 410, which may be an electrode terminal. To prevent a short circuit between the protruding member 420 and the cover plate 300, the protruding member 420 is spaced apart from the cover plate 300 by a certain distance. For example, the size (e.g., diameter) of the protruding member 420 is smaller than the size of the through-hole 310, so that the edge of the protruding member 420 does not contact the cover plate 300. The lower surface of the protruding member 420 has a third diameter D3, which is smaller than the first diameter D1, which is the outer diameter of the housing 200, and the second diameter D2, which is the outer diameter of the upper surface of the flange member 410. The ratio of the third diameter D3 of the lower surface of the protruding member 420 to the second diameter D2 of the upper surface of the flange member 410 is 2 / 25 to 3 / 5. That is, the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 2 / 25 to 3 / 5.

[0060] For example, such as Figure 2 As shown, compared to the lower surface of the cover plate 300, the lower surface of the protruding member 420 can protrude further in the downward direction, and the lower surface of the protruding member 420 can be located on the side lower than the lower surface of the cover plate 300.

[0061] For example, the lower surface of the protruding part 420 may be located on the same line as the lower surface of the cover plate 300, or on the same plane as the lower surface of the cover plate 300.

[0062] For example, compared to the lower surface of the cover plate 300, the lower surface of the protruding member 420 may protrude less in the upward direction, and the lower surface of the protruding member 420 may be located on one side above the lower surface of the cover plate 300.

[0063] The welding area of ​​the second electrode connector 150, which is welded to the protruding member 420, is determined based on the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 of the terminal plate 400. Since the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 2 / 25 to 3 / 5, the second electrode connector 150 is securely coupled to the protruding member 420.

[0064] The protruding part 420 and the flange part 410 are integrally formed, but not limited thereto, and different materials can be combined to form the terminal plate 400.

[0065] A plating layer may be applied to the outer surface of the terminal block 400, but is not limited thereto, and any known coating may be applied to the outer surface of the terminal block 400.

[0066] A thermal fusion layer 500 is disposed between the cover plate 300 and the flange component 410 of the terminal plate 400, and is insulatedly bonded between the cover plate 300 and the flange component 410 of the terminal plate 400. The thermal fusion layer 500 contains insulating material and insulates between the cover plate 300 and the terminal plate 400. The thermal fusion layer 500 is thermally fused between the cover plate 300 and the flange component 410 of the terminal plate 400 using heat or a laser beam. The thermal fusion layer 500 may include any of the various known materials used for insulation and bonding between the cover plate 300 and the terminal plate 400. By bonding the thermal fusion layer 500 between the cover plate 300 and the terminal plate 400, the opening 210 of the housing 200 accommodating the electrode assembly 100 is completely sealed by the cover plate 300, the terminal plate 400, and the thermal fusion layer 500.

[0067] The heat fusion layer 500 may be located between the flange component 410 and the cover plate 300 of the terminal plate 400, and the heat fusion layer 500 may have a minimum fusion length and a maximum fusion length D4 in the direction of the second diameter D2 of the flange component 410.

[0068] Here, the minimum fusion length can refer to the minimum length (in the radial direction) of the overlap between the terminal plate 400 and the cover plate 300 in the vertical direction, from the center of the terminal plate 400 to the edge of the terminal plate 400. The minimum fusion length at which the thermal fusion layer 500 is located can satisfy the following formula 1, but is not limited thereto.

[0069] [Formula 1]

[0070] Minimum fusion length = (second diameter of flange component - (second diameter of flange component * 0.8)) / 2

[0071] Furthermore, the maximum fusion length D4 can refer to the maximum length (in the radial direction) of the overlap between the terminal plate 400 and the cover plate 300 in the vertical direction, from the center of the terminal plate 400 to the edge of the terminal plate 400.

[0072] The maximum fusion length D4 at which the thermal fusion layer 500 is located can satisfy the following equation 2, but is not limited to it.

[0073] [Equation 2]

[0074] Maximum fusion length = (Second diameter of flange component - (Third diameter of protruding component * 1.1)) / 2

[0075] The heat-fused layer 500 is cured by heating, but can also melt at a predetermined temperature. The predetermined temperature at which the heat-fused layer 500 melts can be a temperature exceeding the heat used to cure the heat-fused layer 500, but is not limited to this.

[0076] For example, the heat-fused layer 500 may include thermosetting resin and thermoplastic resin. The thermosetting and thermoplastic resins of the heat-fused layer 500 may be laminated in multiple layers, but are not limited thereto. The thermosetting resin of the heat-fused layer 500 is cured by heat and may include any of the various known thermosetting resins, such as any phenolic resin, urea-formaldehyde resin, melamine resin, epoxy resin, and polyester resin. The thermoplastic resin of the heat-fused layer 500 includes, but is not limited to, polypropylene resin that melts at a predetermined temperature, and may include any of the various known thermoplastic resins, such as any polystyrene, polyethylene, and polyvinyl chloride resin.

[0077] Based on the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 of the terminal plate 400, the bonding area of ​​the heat fusion layer 500 connecting the flange member 410 and the cover plate 300, as well as the maximum fusion length D4 of the heat fusion layer 500, are determined. The ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is between 2 / 25 and 3 / 5, such that the second electrode terminal piece 150 is firmly coupled to the protruding member 420, and simultaneously, the flange member 410 and the cover plate 300 are firmly bonded together by the heat fusion layer 500.

[0078] For example, the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 1 / 10 to 3 / 5. This ratio allows the second electrode contact 150 to be securely coupled to the protruding member 420, while simultaneously, the flange member 410 and the cover plate 300 are securely bonded together through the heat fusion layer 500. Compared to the case where the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 2 / 25 to 3 / 5, the second electrode contact 150 can be more securely coupled to the protruding member 420 when the ratio is 1 / 10 to 3 / 5, and simultaneously, the flange member 410 and the cover plate 300 are more securely bonded together through the heat fusion layer 500.

[0079] For example, the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 can be 1 / 10 to 1 / 2. When the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 1 / 10 to 1 / 2, the second electrode contact 150 can be securely coupled to the protruding member 420, and simultaneously, the flange member 410 and the cover plate 300 can be securely bonded through the heat fusion layer 500. Compared to the case where the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 1 / 10 to 3 / 5, when the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 1 / 10 to 1 / 2, the second electrode contact 150 can be more securely coupled to the protruding member 420, and simultaneously, the flange member 410 and the cover plate 300 can be more securely bonded through the heat fusion layer 500.

[0080] For example, the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 can be 1 / 10 to 1 / 3. When the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 1 / 10 to 1 / 3, the second electrode contact 150 can be securely coupled to the protruding member 420, and simultaneously, the flange member 410 and the cover plate 300 can be securely bonded through the heat fusion layer 500. Compared to the case where the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 1 / 10 to 3 / 5, when the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 1 / 10 to 1 / 3, the second electrode contact 150 can be more securely coupled to the protruding member 420, and simultaneously, the flange member 410 and the cover plate 300 can be more securely bonded through the heat fusion layer 500.

[0081] As described above, in the rechargeable battery 1000 according to the embodiment, the second electrode tab 150 is welded to the welding area of ​​the protruding member 420, the heat fusion layer 500 is bonded to the bonding area of ​​the flange member 410 and the cover plate 300, and the maximum fusion length D4 of the heat fusion layer 500 is determined according to the ratio of the third diameter D3 of the protruding member 420 of the terminal plate 400 to the second diameter D2 of the flange member 410. Since the ratio of the third diameter D3 of the protruding member 420 to the second diameter D2 of the flange member 410 is 2 / 25 to 3 / 5, the second electrode tab 150 is firmly coupled to the protruding member 420, and at the same time the flange member 410 and the cover plate 300 are firmly bonded by the heat fusion layer 500.

[0082] In other words, since the third diameter D3 of the protruding part 420 and the second diameter D2 of the flange part 410 are 2 / 25 to 3 / 5, a rechargeable battery 1000 is provided, which includes a terminal plate 400 that securely seals the electrode assembly 100 together with the housing 200, the cover plate 300 and the heat fusion layer 500 and is simultaneously securely connected to the second electrode terminal piece 150 of the electrode assembly 100.

[0083] In this article, reference Figure 3 and Figure 4 Some experimental examples are described to demonstrate the effectiveness of the rechargeable battery 1000 according to the above embodiments.

[0084] Figure 3 The first table shows experimental examples illustrating the effects of a rechargeable battery according to an embodiment. Figure 4 The second table shows experimental examples illustrating the effects of the rechargeable battery according to the embodiments.

[0085] exist Figure 3 and Figure 4 In this context, the battery size can represent the diameter, which is the outer diameter of a coin-shaped rechargeable battery; the casing specification can represent the specifications of the rechargeable battery casing; the terminal plate specification can represent the specifications of the terminal plate; the maximum fusion length can represent the maximum length in which the flange components and cover plate of the terminal plate overlap vertically from the center to the edge of the terminal plate; and the minimum fusion length can represent the minimum length in which the flange components and cover plate of the terminal plate overlap vertically from the center to the edge of the terminal plate.

[0086] In addition, Figure 3 and Figure 4 In the middle, the shell diameter can refer to Figure 2 The first diameter D1 of the housing 200 shown in the figure, the flange diameter can be indicated Figure 2 The second diameter D2 of the flange component 410 of the terminal block 400 shown in the figure, the protrusion diameter can refer to Figure 2 The third diameter D3 of the protruding part 420 of the terminal board 400 shown in the figure, the maximum fusion length can refer to the location of the heat fusion layer 500 located in Figure 2 The maximum fusion length D4 between the terminal plate 400 and the cover plate 300 shown in the diagram, and the minimum fusion length can refer to the length of the thermal fusion layer 500 within... Figure 2 The minimum fusion length between the terminal block 400 and the cover plate 300 shown in the diagram, and the leakage test results can confirm that there is a leak between the flange component 410 and the cover plate 300. Figure 2 The bonding reliability of the thermal fusion layer 500 shown in the figure can be confirmed by the welding test results. Figure 2 The results show the welding reliability between the second electrode connector 150 and the protruding part 420.

[0087] See Figure 3 and Figure 4 Experimental Examples 1 to 88 (1 to 88) were conducted to demonstrate the effect of numerical limitations on the rechargeable battery according to the above embodiments.

[0088] In Experimental Examples 1 to 11, the first diameter of the housing (housing diameter) is 8 mm, the second diameter of the flange component of the terminal plate (flange diameter) is 6.8 mm, and the third diameter of the protruding component of the terminal plate (protrusion diameter) is 0.5 mm to 4.4 mm. In this case, the maximum fusion length is 3.13 mm to 0.98 mm.

[0089] In Experiment 1, the third diameter (protrusion diameter) of the protruding part of the terminal block is 0.5 mm, where the third diameter of the protruding part / the second diameter of the flange part is less than 2 / 25, and in this case, the maximum fusion length where the heat fusion layer is located is 3.13 mm. Therefore, there is no abnormality (OK) in the combined reliability verification results (leakage test results), but the third diameter of the protruding part to which the second electrode terminal piece is welded is 0.5 mm, so the welding reliability verification results (welding test results) are abnormal (NG).

[0090] In Experiments 2 to 10, the third diameter (protrusion diameter) of the protruding part of the terminal block was 0.6 mm to 4.0 mm, wherein the third diameter of the protruding part / the second diameter of the flange part was approximately 2 / 25 to 3 / 5. In this case, the maximum fusion length of the thermal fusion layer was 3.07 mm to 1.20 mm, satisfying Equation 2. At the same time, the third diameter of the protruding part to which the second electrode terminal piece was welded was 0.6 mm to 4.0 mm. Thus, the reliability verification results (leakage test results) and the welding reliability verification results (welding test results) showed no abnormalities (OK).

[0091] [Equation 2]

[0092] Maximum fusion length = (Second diameter of flange component - (Third diameter of protruding component * 1.1)) / 2

[0093] In Experiment 11, the third diameter (protrusion diameter) of the protruding part of the terminal block is 4.4 mm, where the third diameter of the protruding part / the second diameter of the flange part exceeds 3.5. In this case, the third diameter of the protruding part to which the second electrode terminal piece is welded is 4.4 mm, so there is no abnormality (OK) in the welding reliability verification results (welding test results), but the maximum fusion length where the thermal fusion layer is located is 0.98 mm, so there is an abnormality (NG) in the bonding reliability verification results (leakage test results).

[0094] As demonstrated in Experimental Examples 2 to 10, when the ratio of the third diameter of the protruding part to the second diameter of the flange part is 2 / 25 to 3 / 5, it confirms the effect of the second electrode terminal block being firmly bonded to the protruding part, and simultaneously (e.g., at the same time), the flange part and the cover plate being firmly bonded by the thermofusion layer.

[0095] Furthermore, as demonstrated in Experimental Examples 1 and 11, when the ratio of the third diameter of the protruding part to the second diameter of the flange part is less than 2 / 25 or greater than 3 / 5, it is confirmed that the second electrode terminal is not securely attached to the protruding part, or that the flange part and the cover plate are not securely bonded by the heat fusion layer.

[0096] In other words, as demonstrated by Experimental Examples 1 to 11, it was confirmed that the numerical limit of the ratio of the third diameter of the protruding part to the second diameter of the flange part being 2 / 25 to 3 / 5 is the threshold range for achieving the effect of the second electrode terminal block being firmly bonded to the protruding part and the flange part and the cover plate being firmly bonded by the thermal fusion layer.

[0097] Furthermore, as demonstrated in Experimental Examples 12 to 88, when the ratio of the third diameter of the protruding part to the second diameter of the flange part is 2 / 25 to 3 / 5, it confirms that the second electrode contact is firmly bonded to the protruding part and that the flange part and the cover plate are firmly bonded through the heat fusion layer. When the ratio of the third diameter of the protruding part to the second diameter of the flange part is less than 2 / 25 or greater than 3 / 5, it confirms that the second electrode contact is not firmly bonded to the protruding part, or that the flange part and the cover plate are not firmly bonded through the heat fusion layer.

[0098] In other words, as demonstrated by Experimental Examples 12 to 88, it was confirmed that the numerical limit of the ratio of the third diameter of the protruding part to the second diameter of the flange part being 2 / 25 to 3 / 5 is the threshold range for achieving the effect of the second electrode terminal block being firmly bonded to the protruding part and the flange part and the cover plate being firmly bonded by the thermal fusion layer.

[0099] Although exemplary embodiments of the invention have been described in detail, the scope of the invention is not limited to these embodiments. Various changes and modifications made using the basic concepts of the invention as defined by those skilled in the art in the appended claims should be interpreted as falling within the scope of the invention.

Claims

1. A rechargeable battery, comprising: An electrode assembly includes a first electrode, a second electrode, and a partition between the first electrode and the second electrode; A housing, connected to the first electrode to house the electrode assembly, and including an opening to expose the electrode assembly; A cover plate, coupled to the housing to cover the peripheral area of ​​the opening, and including through holes to expose the central area of ​​the opening; as well as A terminal block, connected to the second electrode to be insulated from and joined to the cover plate, and including a flange component covering the through hole and a protruding component penetrating the through hole from the flange component. The ratio of the diameter of the protruding component to the diameter of the flange component is 2 / 25 to 3 / 5.

2. The rechargeable battery according to claim 1, further comprising: A heat-fused layer is formed between the cover plate and the flange component, and insulates the cover plate and the flange component together.

3. The rechargeable battery according to claim 2, wherein: The thermally bonded layer melts at a predetermined temperature.

4. The rechargeable battery according to claim 1, wherein: The flange component is arranged on the cover plate, and The protruding component is connected to the second electrode from the flange component through the through hole.

5. The rechargeable battery according to claim 4, wherein: The electrode assembly further includes: The first electrode terminal piece extends from the first electrode and is welded to the housing; and The second electrode terminal piece extends from the second electrode and is welded to the protruding part of the terminal plate.

6. The rechargeable battery according to claim 1, wherein: The flange component has a larger area than the protruding component.

7. The rechargeable battery according to claim 1, wherein: The flange component has a thickness that is thinner than the protruding component.

8. The rechargeable battery according to claim 1, wherein: The flange component and the protruding component are integrally formed.

9. The rechargeable battery according to claim 1, wherein: The housing and the cover plate have the same polarity as the first electrode, and The terminal block has the same polarity as the second electrode.

10. The rechargeable battery according to claim 1, wherein: The diameter of the flange component is smaller than the diameter of the housing.

11. The rechargeable battery according to claim 1, wherein: The ratio of the diameter of the protruding component to the diameter of the flange component is 1 / 10 to 3 / 5.

12. The rechargeable battery according to claim 1, wherein: The ratio of the diameter of the protruding component to the diameter of the flange component is 1 / 10 to 1 / 2.

13. The rechargeable battery according to claim 1, wherein: The ratio of the diameter of the protruding component to the diameter of the flange component is 1 / 10 to 1 / 3.

14. The rechargeable battery according to claim 1, wherein: The rechargeable battery includes coin cell batteries or button cell batteries.

15. The rechargeable battery according to claim 14, wherein: The height-to-diameter ratio (height / diameter) of the coin-shaped battery or the button-shaped battery is 1 or less.

16. A rechargeable battery, comprising: An electrode assembly includes a first electrode, a second electrode, and a partition between the first electrode and the second electrode; A housing, connected to the first electrode to house the electrode assembly, and including an opening to expose the electrode assembly; A cover plate, coupled to the housing to cover the peripheral area of ​​the opening, and including through holes to expose the central area of ​​the opening; as well as A terminal block, connected to the second electrode to be insulated from and joined to the cover plate, and including a flange component covering the through hole and a protruding component penetrating the through hole from the flange component. The ratio of the diameter of the protruding component to the diameter of the flange component is 2 / 25 or greater.

17. The rechargeable battery according to claim 16, wherein: The ratio of the diameter of the protruding component to the diameter of the flange component is 3 / 5 or less.

18. The rechargeable battery according to claim 16, wherein: The ratio of the diameter of the protruding component to the diameter of the flange component is 1 / 2 or less.

19. The rechargeable battery according to claim 16, wherein: The ratio of the diameter of the protruding component to the diameter of the flange component is 1 / 3 or less.

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