Rechargeable battery

Abstract

A rechargeable battery includes: an electrode assembly including a first electrode tab and a second electrode tab; a case including an opening and receiving the electrode assembly to be connected to the first electrode tab; a cover assembly including a cover plate coupled to the case and covering the opening and a terminal plate coupled to the cover plate and connected to the second electrode tab; a first insulating member between the second electrode tab and the cover plate; a second insulating member attached to a surface of the second electrode tab; and a third insulating member between the second electrode tab and the electrode assembly.

Description

Technical Field

[0001] Aspects of embodiments of the present invention relate to rechargeable batteries. Background Art

[0002] Unlike primary batteries, which cannot be recharged, rechargeable batteries can be repeatedly charged and discharged. Low-capacity rechargeable batteries are used in portable small electronic devices such as mobile phones, notebook computers, and camcorders. Large-capacity batteries are widely used as power sources for driving motors such as for hybrid vehicles.

[0003] Representative rechargeable batteries include nickel-cadmium (Ni-Cd) batteries, nickel-metal hydride (Ni-MH) batteries, lithium (Li) batteries, and lithium-ion (Li-ion) rechargeable batteries. In particular, lithium-ion rechargeable batteries have an operating voltage about three times higher than that of nickel-cadmium batteries or nickel-metal hydride batteries, which are mainly used as power sources for portable electronic devices. In addition, lithium-ion rechargeable batteries are widely used because of their high energy density per unit weight.

[0004] In particular, as the demand for wearable devices such as headphones using Bluetooth, in-ear headphones, smart watches, and body-attached medical devices increases, the demand for rechargeable batteries that are high in energy density and ultra-small is increasing.

[0005] Ultra-small rechargeable batteries have the following important tasks: ensuring a required electric capacity within a limited size, achieving an effective structure while improving effective low weight, and improving structural stability.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0007] According to one aspect of an embodiment of the present invention, an ultra-small rechargeable battery is provided. According to another aspect of an embodiment of the present invention, a rechargeable battery is provided that prevents or substantially prevents damage to a separator due to heat at an upper portion of an electrode assembly when laser welding a cap assembly to a case.

[0008] According to one or more embodiments, a rechargeable battery includes: an electrode assembly including a first electrode tab and a second electrode tab; a case including an opening and receiving the electrode assembly to be connected to the first electrode tab; a cover assembly including a cover plate coupled to the case and covering the opening and a terminal plate coupled to the cover plate and connected to the second electrode tab; a first insulating member between the second electrode tab and the cover plate; a second insulating member attached to a surface of the second electrode tab; and a third insulating member between the second electrode tab and the electrode assembly.

[0009] The electrode assembly may include a first electrode, a second electrode, and a separator between the first electrode and the second electrode, the first electrode may be connected to the first electrode tab, and the second electrode may be connected to the second electrode tab.

[0010] The rechargeable battery may further include an insulating member between the cap plate and the terminal plate to electrically insulate the cap plate and the terminal plate from each other.

[0011] The terminal plate may include: a flange portion, which is located on the outside of the cover plate and is electrically insulated from and attached to the outer surface of the cover plate; and a tab connection portion, which protrudes from the center of the flange portion to protrude toward the electrode assembly through the terminal hole of the cover plate and the through hole of the first insulating member, and is electrically connected to the second electrode tab at the inner surface of the tab connection portion.

[0012] The first insulating member may include an insulating gasket attached to an inner surface of the cap plate and having a through hole.

[0013] The second insulating member may include an insulating tape attached to a surface of the second electrode tab, a portion of the tab connection portion, and a portion of the first insulating member.

[0014] The third insulating member may include an insulating disk attached to the center of one end of the electrode assembly and larger than the inner surface of the tab connection portion to overlap the first insulating member around the through hole of the first insulating member.

[0015] The terminal plate may include: a flange portion, between the cover plate and the electrode assembly, and located on the inner side of the step of the first insulating member to be electrically insulated from and attached to the inner surface of the cover plate; and a protruding terminal, protruding from the center of the flange portion to pass through the terminal hole of the cover plate and electrically connected to the second electrode tab at the inner surface of the terminal plate.

[0016] The first insulating member may include an insulating gasket attached to the inner surface of the cap plate and including the step, and the flange portion may be disposed at the step.

[0017] The second insulating member may include an insulating tape attached to a surface of the second electrode tab, a portion of the protruding terminal, and a portion of the first insulating member.

[0018] The third insulating member may include an insulating disk attached to the center of one end of the electrode assembly and larger than an inner surface of the flange portion to overlap the first insulating member around the step of the first insulating member.

[0019] As described above, in a rechargeable battery according to one or more embodiments of the present invention, a first insulating member is arranged between a second electrode tab connected to a terminal plate and the cover plate, a second insulating member is attached to a surface of the second electrode tab, and a third insulating member is arranged between the second electrode tab and the electrode assembly, thereby preventing or substantially preventing damage to the partition due to heat at the upper portion of the electrode assembly when the cover assembly is laser welded to the case. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of a rechargeable battery according to an embodiment of the present invention.

[0021] Figure 2 for Figure 1 An exploded perspective view of a rechargeable battery.

[0022] Figure 3 For along Figure 1 A cross-sectional view taken along line III-III in FIG.

[0023] Figure 4 is a perspective view of a rechargeable battery according to an embodiment of the present invention.

[0024] Figure 5 for Figure 4 An exploded perspective view of a rechargeable battery.

[0025] Figure 6 For along Figure 4 A cross-sectional view taken along line VI-VI in FIG.

[0026] Description of Reference Numerals

[0027] 1, 2: Rechargeable battery 10: Electrode assembly

[0028] 11: First electrode 12: Second electrode

[0029] 13: partition 20: shell

[0030] 30, 60: Cover assembly 31: Cover plate

[0031] 33, 63: Terminal board 34: Hot melt component

[0032] 51: first electrode terminal tab 52: second electrode terminal tab

[0033] 61, 62: first insulating member 101, 102: first end, second end

[0034] 311: Terminal hole 331, 631: Flange

[0035] 332: protruding terminal 341: through hole

[0036] 611: through hole 612, 622: second insulating member

[0037] 613, 623: third insulating member 621: step

[0038] 632: Lug connection D: Battery diameter

[0039] H: height L1, L2: distance

[0040] ΔH1: first height difference ΔH2: second height difference DETAILED DESCRIPTION

[0041] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the scope of the present invention. The accompanying drawings and descriptions are to be regarded as illustrative and non-restrictive in nature. Similar reference numerals refer to similar elements throughout the specification.

[0042] In addition, unless explicitly described to the contrary, it should be understood that terms such as "include", "comprises" or "has" used in this specification indicate the existence of the features, numbers, steps, operations, components, parts and / or their combinations, but do not preclude the existence or addition of one or more other features, numbers, steps, operations, components, parts or their combinations.

[0043] Further, in the present specification, it should be understood that when a component is referred to as being “connected” or “coupled” to another component, it may be directly connected or coupled to the other component or connected or coupled to the other component with one or more other components interposed therebetween.

[0044] Unless the context clearly indicates otherwise, singular forms shall include plural forms.

[0045] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another element. For example, a first element may be referred to as a "second" element, and similarly, a second element may be referred to as a "first" element without departing from the scope of the exemplary embodiments of the present invention. Unless the context clearly indicates otherwise, a term in the singular may include a plural form.

[0046] In addition, terms such as "below", "lower", "above", "upper", etc. are used to describe the relationship of the configurations shown in the drawings. However, these terms are used as relative concepts and are described with reference to the directions indicated in the drawings.

[0047] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those of ordinary skill in the art to which the inventive concept belongs. It should also be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this article.

[0048] The rechargeable battery according to an embodiment of the present invention is an ultra-compact battery, which may be a coin battery or a button battery. Here, the coin battery or button battery is a thin coin-type battery or a button-type battery, and refers to a battery having a height (H) to diameter (D) ratio (H / D) of 1 or less (see Figure 1 ).

[0049] In one embodiment, the coin cell or button cell is generally cylindrical and the horizontal cross section is circular, but the present invention is not limited thereto, and the horizontal cross section may be elliptical or polygonal. In this case, the diameter is determined as the maximum distance of the outer circumference of the housing based on the horizontal direction of the battery, and the height is determined as the maximum distance based on the vertical direction of the battery (the distance from the flat bottom to the flat top).

[0050] However, the present invention is not limited to the coin cell or button cell as an example of the present invention, and the battery of the present invention may be a cylindrical battery or a pin-type battery. Herein, the case where the rechargeable battery according to an embodiment of the present invention is a coin cell or a button cell will be further described in detail as an example.

[0051] Figure 1 is a perspective view of a rechargeable battery according to an embodiment of the present invention; Figure 2 for Figure 1 An exploded perspective view of a rechargeable battery; Figure 3 For along Figure 1 A cross-sectional view taken along line III-III in FIG.

[0052] See also Figures 1 to 3 , a rechargeable battery 1 according to an embodiment includes an electrode assembly 10 , a case 20 , a cap assembly 60 , a first insulating member 61 , a second insulating member 612 , and a third insulating member 613 .

[0053] The cap assembly 60 includes a cap plate 31 and a terminal plate 63 coupled to each other. As an example, the cap plate 31 and the terminal plate 63 are heat-fused by a heat-melting member 34 disposed therebetween.

[0054] The heat-melting member 34 serves as a medium to connect the cap plate 31 and the terminal plate 63 to each other. For example, the heat-melting member 34 may be formed of an electrically insulating material such as a polymer, and may be melted using a laser or the like to be fused to the cap plate 31 and the terminal plate 63.

[0055] In an embodiment, by coupling the terminal plate 63 to the cap plate 31 using the hot melt member 34 , a stable coupling structure can be formed while effectively insulating between the terminal plate 33 and the cap plate 31 without adding a separate insulating configuration.

[0056] Since the coin battery is manufactured in an ultra-compact size, it may have design limitations in terms of space, and accordingly, it is desired to ensure functionality while simplifying its structure and manufacturing process. In this regard, in this embodiment, insulation and connection between the terminal plate 63 and the cap plate 31 are achieved by the hot melt member 34.

[0057] In one embodiment, 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 respective sides of a separator 13 as an electrical insulating material, and the electrode assembly 10 is formed by winding the first electrode 11, the separator 13, and the second electrode 12. Therefore, the electrode assembly 10 may be formed in a jelly roll type. In another embodiment, although not separately shown, the electrode assembly may be formed in a stacked type.

[0058] The electrode assembly 10 is configured for charging and discharging, and the winding axis of the electrode assembly 10 may be parallel to the height direction ( Figures 1 to 3 In one embodiment, the first end (the lower surface of the electrode assembly) 101 and the second end (the upper surface of the electrode assembly) 102 of the electrode assembly 10 may be flat and parallel to each other. In one embodiment, the electrode assembly 10 is not provided with a center pin, but in another embodiment, a center pin (not shown) may be provided at the position of the winding axis.

[0059] The case 20 accommodates the electrode assembly 10 while facing the first end 101 of the electrode assembly 10. In one embodiment, the electrode assembly 10 is covered by the insulating sheet 14 and built in the case 20. As an example, the case 20 is formed as a cylinder accommodating the jelly roll type electrode assembly 10, and the cap assembly 60 seals the opening 21 of the cylindrical case 20.

[0060] The electrode assembly 10 includes a first electrode tab 51 connected to the first electrode 11 and a second electrode tab 52 connected to the second electrode 12 , and the first electrode 11 and the second electrode 12 are led out to a first end 101 and a second end 102 , respectively.

[0061] In a state where the electrode assembly 10 is accommodated in the case 20 , the first electrode tab 51 is electrically connected to the bottom of the case 20 , and the second electrode tab 52 is electrically connected to the terminal plate 63 of the cap assembly 60 .

[0062] In addition, the cap plate 31 of the cap assembly 60 is coupled to the case 20 to cover the opening 21 while facing the second end 102 of the electrode assembly 10. In one embodiment, the terminal plate 63 is coupled to the second electrode tab 52 while being coupled to the cap plate 31 with the hot melt member 34.

[0063] Here, a case where the first electrode 11 and the second electrode 12 are a negative electrode and a positive electrode, respectively, will be described as an example, but the present invention is not limited thereto, and the first electrode 11 and the second electrode 12 may be a positive electrode and a negative electrode, respectively.

[0064] In one embodiment, the first electrode (negative electrode) 11 is formed in a long extended strip shape and includes a negative electrode coating portion and a negative electrode uncoated portion, the negative electrode coating portion is a region where a current collector of a metal foil (e.g., a copper foil) is coated with a negative electrode active material layer, and the negative electrode uncoated portion is a region where an active material is not coated. The negative electrode uncoated portion may be disposed at an end portion in the length direction of the negative electrode.

[0065] In one embodiment, the second electrode (positive electrode) 12 is formed into a long extended strip shape and includes a positive electrode coating portion and a positive electrode uncoated portion, the positive electrode coating portion is a region where the current collector of the metal foil (e.g., aluminum foil) is coated with a positive electrode active material layer, and the positive electrode uncoated portion is a region where the active material is not coated. The positive electrode uncoated portion may be disposed at the end of the positive electrode in the length direction.

[0066] The case 20 allows the electrode assembly 10 to be inserted into an opening 21 formed at one side of the case 20, and has a space for accommodating the electrode assembly 10 and an electrolyte therein. In one embodiment, for example, the case 20 is formed in a cylindrical shape having a height H smaller than a diameter D thereof, and has a circular opening 21 so that the cylindrical electrode assembly 10 corresponding to the internal space of the case 20 can be inserted.

[0067] The terminal plate 63 of the cap assembly 60 includes a flange portion 631 and a tab connection portion 632. The flange portion 631 is disposed outside the cap plate 31 and is electrically insulated from and attached to the outer surface of the cap plate 31 via the heat-melting member 34.

[0068] In the terminal plate 63 , the tab connection portion 632 protrudes from the center of the flange portion 631 to the inside, and passes through the through hole 341 of the hot melt member 34 and the terminal hole 311 of the cover plate 31 to protrude toward the electrode assembly 10 , and the second electrode tab 52 is electrically connected to the inner surface of the tab connection portion 632 .

[0069] The flange portion 631 protrudes more than the outer surface of the cap plate 31 by a first height difference ΔH1 to form the outer surface of the rechargeable battery 1. In other words, the outer surface of the flange portion 631 protrudes more than the outer surface of the cap plate 31 relative to the bottom of the housing 20. In addition, the outer surface of the flange portion 631 and the outer surface of the cap plate 31 have a first height difference ΔH1.

[0070] Here, the first insulating member 61, the second insulating member 612, and the third insulating member 613 are described. The first insulating member 61 is formed between the second electrode tab 52 and the cap plate 31. As an example, the first insulating member 61 is disposed on the upper side of the second electrode tab 52 and attached to the inner surface of the cap plate 31. The first insulating member 61 may form an electrical insulation structure between the cap plate 31 and the second electrode tab 52 and between the cap plate 31 and the electrode assembly 10.

[0071] In an embodiment, the first insulating member 61 may include an insulating gasket attached to the inner surface of the cap plate 31 and having a through hole 611. As an example, the first insulating member 61 may be formed of an insulating gasket having a through hole 611 corresponding to the terminal hole 311 of the cap plate 31. Therefore, the tab connection portion 632 protrudes from the center of the flange portion 631 to the inside, passes through the terminal hole 311 of the cap plate 31 and the through hole 611 of the first insulating member 61 to protrude toward the electrode assembly 10, and is electrically connected to the second electrode tab 52 at the inner surface of the tab connection portion 632.

[0072] The second insulating member 612 is attached to the surface of the second electrode tab 52. As an example, the second insulating member 612 is attached to the lower side of the second electrode tab 52. As an example, the second insulating member 612 may include or be formed of an insulating tape that is attached to the surface of the second electrode tab 52, a portion of the tab connection portion 632, and a portion of the first insulating member 61. The second insulating member 612 may form an electrical insulation structure between the second electrode tab 52 and the second end 102 of the electrode assembly 10.

[0073] The third insulating member 613 is formed between the second electrode tab 52 and the electrode assembly 10. As an example, the third insulating member 613 is attached to the second end 102 of the electrode assembly 10 at one side of the second electrode tab 52. In an embodiment, the third insulating member 613 may include an insulating disk attached to the center of the second end 102 of the electrode assembly 10 and larger than the inner surface of the tab connection portion 632 to overlap with the first insulating member 61 around the through hole 611 of the first insulating member 61. As an example, the third insulating member 613 is attached to the center of the second end 102 of the electrode assembly 10 and may be formed of an insulating disk larger than the inner surface of the tab connection portion 632 so as to overlap with the first insulating member 61 around the through hole 611 of the first insulating member 61 by a distance (e.g., a predetermined distance) L1.

[0074] The first insulating member 61 and the second insulating member 612 electrically insulate both sides of the second electrode tab 52 from the cap plate 31 and the second end 102 of the electrode assembly 10, respectively. In addition, despite the use of the first insulating member 61 and the second insulating member 612, the third insulating member 613 may further electrically insulate the second electrode tab 52 from the second end 102 of the electrode assembly 10 in the open portion of the second end 102 of the electrode assembly 10.

[0075] See also Figure 1 In the rechargeable battery 1 according to an embodiment, in a state where the opening 21 of the housing 20 is closed and sealed by the cap assembly 60, the height H is defined as the distance between the housing 20 and the outer plane of the flange portion 631, and the battery diameter D is defined by the outer circumference of the housing 20. In an embodiment, the ratio of the height H to the battery diameter D is 1 or less (H / D≤1). Therefore, the rechargeable battery 1 according to the embodiment is a coin-type battery or a button-type battery, and can be formed into a thin coin or button shape.

[0076] Here, another embodiment of the present invention is described. By comparing the first embodiment and the second embodiment, the description of the same configuration may be omitted, and the different configurations with respect to the second embodiment are mainly described.

[0077] Figure 4A perspective view showing a rechargeable battery according to an embodiment of the present invention; Figure 5 for Figure 4 An exploded perspective view of a rechargeable battery; Figure 6 For along Figure 4 A cross-sectional view taken along line VI-VI in FIG.

[0078] See also Figures 4 to 6 In the cap assembly 30, the terminal plate 33 includes a flange portion 331 and a protruding terminal 332. The rechargeable battery according to an embodiment further includes another insulating member disposed between the cap plate 31 and the terminal plate 33 to electrically insulate the cap plate 31 and the terminal plate 33 from each other.

[0079] The flange portion 331 is disposed between the cap plate 31 and the electrode assembly 10, disposed on the inner side of the step 621 of the first insulating member 62, and is electrically insulated from the inner surface of the cap plate 31 via the other insulating member and attached to the inner surface of the cap plate 31. In one embodiment, the flange portion 331 may be disposed at the step 621. As an example, the other insulating member may be formed by a hot melt member 34.

[0080] In the terminal plate 33, the protruding terminal 332 protrudes to the outside from the center of the flange portion 331 through the through hole 341 of the hot melt member 34 and the terminal hole 311 of the cover plate 31, and the inner surface of the terminal plate 33 (e.g., the inner surface of the protruding terminal 332) is electrically connected to the second electrolysis tab 52. The second electrode tab 52 may be connected to the inner surface of the flange portion 331 or the inner surface of the protruding terminal 332, or to both.

[0081] The protruding terminal 332 protrudes more than the outer surface of the cap plate 31 by a second height difference ΔH2 to form the outer surface of the rechargeable battery 2. That is, relative to the bottom of the case 20, the outer surface of the protruding terminal 332 protrudes more than the outer surface of the cap plate 31, and the outer surface of the protruding terminal 332 and the outer surface of the cap plate 31 have a second height difference ΔH2.

[0082] Here, the first insulating member 62, the second insulating member 622, and the third insulating member 623 are described. The first insulating member 62 is disposed on the upper side of the second electrode tab 52 and is attached to the inner surface of the cap plate 31 to further extend to the inner surface of the flange part 331. The first insulating member 62 may form an electrical insulation structure between the cap plate 31 and the second electrode tab 52, between the cap plate 31 and the electrode assembly 10, and between the flange part 331 and the electrode assembly 10.

[0083] In one embodiment, the first insulating member 62 may include an insulating gasket attached to the inner surface of the cap plate 31 and including a step 621. As an example, the first insulating member 62 may be formed of an insulating gasket having a step 621 corresponding to the outer diameter of the hot melt member 34. Therefore, the protruding terminal 332 protrudes to the outside from the center of the flange portion 331, protrudes toward the outside through the through hole 341 of the hot melt member 34 and the terminal hole 311 of the cap plate 31, and is electrically connected to the second electrode tab 52 at the inner surface of the terminal plate 33.

[0084] The second insulating member 622 is attached to the lower side of the second electrode tab 52. As an example, the second insulating member 622 may include or be formed of an insulating tape attached to a surface of the second electrode tab 52, a portion of the protruding terminal 332, and a portion of the first insulating member 62. The second insulating member 622 may form an electrical insulation structure between the second electrode tab 52 and the second end 102 of the electrode assembly 10.

[0085] The third insulating member 623 is attached to the second end 102 of the electrode assembly 10 at one side of the second electrode tab 52. In one embodiment, the third insulating member 623 may include an insulating disk attached to the center of the second end 102 of the electrode assembly 10 and larger than the inner surface of the flange portion 331 to overlap the first insulating member 62 around the step of the first insulating member 62. As an example, the third insulating member 623 may be attached to the center of the second end 102 of the electrode assembly 10 and may be formed of an insulating disk larger than the inner surface of the flange portion 331 so as to overlap the first insulating member 62 around the step 621 of the first insulating member 62 by a distance (e.g., a predetermined distance) L2.

[0086] The first insulating member 62 and the second insulating member 622 electrically insulate both sides of the second electrode tab 52 from the cap plate 31 and the second end 102 of the electrode assembly 10, respectively. In addition, despite the use of the first insulating member 62 and the second insulating member 622, the third insulating member 623 may further electrically insulate the second electrode tab 52 from the second end 102 of the electrode assembly 10 in the open portion of the second end 102 of the electrode assembly 10.

[0087] See also Figure 4 In the rechargeable battery 2 according to an embodiment, in a state where the opening 21 of the housing 20 is closed and sealed by the cap assembly 30, the height H is defined as the distance between the bottom outer plane of the housing 20 and the protruding terminal 332, and the battery diameter D is defined by the outer circumference of the housing 20. In an embodiment, the ratio of the height H to the battery diameter D is 1 or less (H / D≤1). Therefore, the rechargeable battery according to the embodiment can have a thin coin or button shape as in a coin battery or a button battery.

[0088] While the present invention has been described in conjunction with what are presently considered to be some practical example embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the purview of the appended claims.

Claims

1. A rechargeable battery comprising: An electrode assembly including a first electrode terminal tab and a second electrode terminal tab; a housing including an opening and receiving the electrode assembly to be connected to the first electrode tab; a cap assembly including a cap plate coupled to the case and covering the opening and a terminal plate coupled to the cap plate and connected to the second electrode tab; a first insulating member between the second electrode tab and the cap plate in a height direction of the housing; a second insulating member attached to a surface of the second electrode tab facing the electrode assembly; and a third insulating member between the second electrode tab and one end of the electrode assembly, A portion of the one end of the electrode assembly overlaps with the first insulating member in the height direction of the shell, and the rest of the one end of the electrode assembly entirely overlaps with the third insulating member in the height direction of the shell.

2. The rechargeable battery according to claim 1, wherein The electrode assembly includes a first electrode, a second electrode, and a separator between the first electrode and the second electrode, The first electrode is connected to the first electrode tab, and The second electrode is connected to the second electrode tab. 3 . The rechargeable battery according to claim 2 , further comprising an insulating member between the cap plate and the terminal plate to electrically insulate the cap plate and the terminal plate from each other.

4. The rechargeable battery according to claim 2, wherein the terminal plate comprises: a flange portion, located on the outer side of the cover plate, electrically insulated from the outer surface of the cover plate and attached to the outer surface of the cover plate; and A tab connection portion protrudes from a center of the flange portion to protrude toward the electrode assembly through the terminal hole of the cap plate and the through hole of the first insulating member, and is electrically connected to the second electrode tab at an inner surface of the tab connection portion. 5 . The rechargeable battery of claim 4 , wherein the first insulating member comprises an insulating gasket attached to an inner surface of the cap plate and having a through hole. 6 . The rechargeable battery of claim 5 , wherein the second insulating member comprises an insulating tape attached to the surface of the second electrode tab facing the electrode assembly, a portion of the tab connection part, and a portion of the first insulating member.

7. The rechargeable battery of claim 5, wherein the third insulating member comprises an insulating disk attached to the center of the one end of the electrode assembly and larger than the inner surface of the tab connection portion to overlap with the first insulating member around the through hole of the first insulating member.

8. The rechargeable battery according to claim 2, wherein the terminal plate comprises: a flange portion, between the cap plate and the electrode assembly, located inside the step of the first insulating member, and electrically insulated from and attached to the inner surface of the cap plate by a hot melt member; and A protruding terminal protrudes from a center of the flange portion to pass through the terminal hole of the cap plate and is electrically connected to the second electrode tab at an inner surface of the terminal plate.

9. The rechargeable battery according to claim 8, wherein The first insulating member includes an insulating gasket attached to the inner surface of the cover plate and including the step, and The flange portion is arranged at the step. 10 . The rechargeable battery of claim 9 , wherein the second insulating member comprises an insulating tape attached to the surface of the second electrode tab facing the electrode assembly, a portion of the protruding terminal, and a portion of the first insulating member.

11. The rechargeable battery of claim 9, wherein the third insulating member comprises an insulating disk attached to the center of the one end of the electrode assembly and larger than an inner surface of the flange portion to overlap the first insulating member around the step of the first insulating member.

Images