Rechargeable batteries

Abstract

One aspect of the present invention is to provide a rechargeable battery that simplifies the process of connecting an electrode tab of an electrode assembly to a terminal plate or a case. A rechargeable battery according to an embodiment of the present invention includes: an electrode assembly having a first electrode tab and a second electrode tab; a case that houses the electrode assembly and is electrically connected to the first electrode tab; a cap assembly comprising a cap plate coupled to an opening of the case and a terminal plate coupled to the cap plate in an insulated state and electrically connected to the second electrode tab; and a conductive double-sided adhesive member for at least one of a first connection between the first electrode tab and the case and a second connection between the second electrode tab and the terminal plate.

Description

Technical Field

[0001] The present invention relates to a rechargeable battery, and more particularly to an ultra-small rechargeable battery. Background Art

[0002] Unlike primary batteries, which cannot be recharged, rechargeable batteries can be charged and discharged repeatedly. Low-capacity rechargeable batteries are already used in small electronic devices such as mobile phones, laptop computers, and camcorders, while large-capacity batteries are widely used as a power source for motors that drive 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 secondary batteries have an operating voltage approximately three times higher than nickel-cadmium batteries or nickel-metal hydride batteries, which are mainly used as power sources for portable electrical devices. In addition, lithium-ion secondary batteries are widely used in aspects of high energy density per unit weight.

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

[0005] Important tasks for ultra-small rechargeable batteries are to ensure the required electrical capacity within a limited size, realize an efficient 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] One aspect of the present invention is to provide a rechargeable battery having a simplified process of connecting an electrode tab of an electrode assembly to a terminal plate or a case. In addition, one aspect of the present invention is to provide a rechargeable battery having a simplified process of connecting an external tab of a rechargeable battery to a set.

[0008] A rechargeable battery according to an embodiment of the present invention includes: an electrode assembly having a first electrode tab and a second electrode tab; a case that accommodates the electrode assembly and is electrically connected to the first electrode tab; a cover assembly, including a cover plate coupled to an opening of the case and a terminal plate coupled to the cover plate in an insulating state and electrically connected to the second electrode tab; and a conductive double-sided adhesive member applied to at least one of a first connection between the first electrode tab and the case and a second connection between the second electrode tab and the terminal plate.

[0009] The conductive double-sided adhesive member may be formed of a conductive double-sided tape.

[0010] The conductive double-sided tape may include a conductive mesh portion formed in a mesh structure having conductivity and a rubber adhesive filled around the conductive mesh portion to form the first connection and the second connection.

[0011] The conductive double-sided adhesive member may be formed of an anisotropic conductive film.

[0012] The conductive double-sided adhesive member may include a first conductive double-sided tape interposed between the lower surface of the first electrode tab and the inner surface of the case facing each other, and the first connection may electrically and mechanically connect the two using the first conductive double-sided tape.

[0013] The conductive double-sided adhesive member may include a second conductive double-sided tape interposed between the upper surface of the second electrode tab and the lower surface of the terminal plate facing each other, and the second connection may electrically and mechanically connect the two using the second conductive double-sided tape.

[0014] The terminal plate may include: a flange portion that is provided on the outer side of the cap plate and is electrically insulated and attached to the outer surface of the cap plate by inserting a heat-fusion member, and a tab connecting portion that protrudes from the center of the flange portion to the inner side of the flange portion and protrudes toward the electrode assembly through the through hole of the heat-fusion member and the terminal hole of the cap plate, and the second conductive double-sided tape may be electrically and mechanically connected between the second electrode tab and the inner surface of the tab connecting portion.

[0015] The terminal plate may include: a flange portion provided on an inner side of the cover plate and electrically insulatedly attached to an inner surface of the cover plate by a heat-fusion member interposed between the flange portion and the cover plate, and a protruding terminal protruding from a center of the flange portion to the outside and passing through a through hole of the heat-fusion member and a terminal hole of the cover plate, and the second conductive double-sided tape may be mechanically and electrically connected between the second electrode tab and the inner surface of the flange portion.

[0016] The terminal plate may include: a flange portion that is provided on the outer side of the cover plate and is electrically insulated and attached to the outer surface of the cover plate by inserting a heat-fusion member; and a tab connecting portion that protrudes from the center of the flange portion to the inner side of the flange portion and protrudes toward the electrode assembly through the through hole of the heat-fusion member and the terminal hole of the cover plate, and in a third connection for connecting the terminal plate to the kit, a third conductive double-sided adhesive member is connected between the first external tab connected to the outer surface of the flange portion and the kit.

[0017] In the fourth connection of connecting the case to the sleeve, a fourth conductive double-sided adhesive member may be connected between the second external tab connected to the outer surface of the case and the sleeve.

[0018] The terminal plate may include: a flange portion, which is provided on the inner side of the cover plate and is electrically insulated and attached to the inner surface of the cover plate by a heat-fusion member interposed between the flange portion and the cover plate, and a protruding terminal, which protrudes from the center of the flange portion to the outside and passes through a through hole of the heat-fusion member and a terminal hole of the cover plate, and in a third connection for connecting the terminal plate to the kit, a third conductive double-sided adhesive member may be connected between the first external terminal tab connected to the outer surface of the protruding terminal and the kit.

[0019] In this way, the rechargeable battery according to an embodiment of the present invention applies a conductive double-sided adhesive member to at least one of the first connection between the first electrode tab and the case and the second connection between the second electrode tab and the terminal plate, thereby simplifying the process of connecting the first electrode tab and the second electrode tab to the terminal plate or the case.

[0020] Furthermore, since the rechargeable battery of the embodiment applies the conductive double-sided adhesive member to the connection between the external tab of the rechargeable battery and the pack, the process of connecting the external tab to the pack can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view showing a rechargeable battery according to a first embodiment of the present invention.

[0022] Figure 2 yes Figure 1 Exploded perspective view of a rechargeable battery in a .

[0023] Figure 3 It is along Figure 1 A cross-sectional view taken along line III-III in FIG.

[0024] Figure 4 Is used to apply Figure 2 and Figure 3 An enlarged cross-sectional view of a portion of the second conductive double-sided tape electrically and mechanically connecting the second electrode tab and the terminal plate.

[0025] Figure 5 is a perspective view showing a rechargeable battery according to a second embodiment of the present invention.

[0026] Figure 6 yes Figure 5 Exploded perspective view of a rechargeable battery in a .

[0027] Figure 7 It is along Figure 5 A cross-sectional view taken along line VII-VII in FIG.

[0028] Figure 8 is a cross-sectional view of electrically connecting an external terminal tab and a member of the rechargeable battery of the first embodiment.

[0029] Figure 9 is a cross-sectional view of electrically connecting an external terminal tab and a housing of a rechargeable battery according to a second embodiment. DETAILED DESCRIPTION

[0030] The present invention will be described more fully below with reference to the accompanying drawings in which 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 description are to be considered as illustrative and not restrictive in nature. Throughout the specification, the same reference numerals refer to the same elements.

[0031] The rechargeable battery according to an embodiment of the present invention is an ultra-small battery, which may be a coin cell or a button cell. Here, a coin cell or a button cell is a thin coin-type or button-type battery, and refers to a battery having a height (H) to diameter (D) ratio (H / D) of 1 or less (refer to Figure 1 ).

[0032] Since coin cells or button cells are mainly cylindrical, 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 (or shell) based on the horizontal direction of the battery, and the height is determined as the maximum distance of the housing (or shell) based on the vertical direction of the battery (the distance from the flat bottom to the flat top cross section).

[0033] 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 or pin-type battery. Hereinafter, the case where the rechargeable battery according to an embodiment of the present invention is a coin cell or button cell will be described in detail.

[0034] Figure 1 is a perspective view showing a rechargeable battery according to a first embodiment of the present invention, Figure 2 yes Figure 1 An exploded perspective view of a rechargeable battery in Figure 3 It is along Figure 1 A cross-sectional view taken along line III-III in FIG. Figures 1 to 3 , the rechargeable battery 100 of the first embodiment includes an electrode assembly 10 , a case 20 , a cap assembly 60 , and a conductive double-sided adhesive member 40 .

[0035] The cap assembly 60 includes a cap plate 31 and a terminal plate 63 coupled together. As an example, the cap plate 31 and the terminal plate 63 are heat-sealed by a heat fusion member 34 provided therebetween.

[0036] The heat fusion member 34 serves as a medium for bonding the cap plate 31 and the terminal plate 63 to each other. For example, the heat fusion member 34 may be formed of an electrically insulating material such as a polymer and may be melted and fused to the cap plate 31 and the terminal plate 63 using a laser or the like.

[0037] The first embodiment can form a stable sealing and bonding structure by bonding the terminal plate 63 to the cap plate 31 using the heat fusion member 34 while effectively insulating between the terminal plate 63 and the cap plate 31 without adding a separate insulating structure.

[0038] The electrode assembly 10 includes a first electrode (11, for example, a negative electrode) and a second electrode (12, for example, a positive electrode) provided on respective surfaces of a separator 13 as an electrical insulating material, and is formed by winding the first electrode 11, the separator 13, and the second electrode 12. Therefore, the electrode assembly 10 can be formed into a jelly roll type. Although not separately shown, the electrode assembly can be formed into a stacked type.

[0039] The electrode assembly 10 is configured to be charged and discharged, and in the electrode assembly 10, the winding axis may be parallel to the height direction ( Figures 1 to 3 The arrangement is in the up and down directions.

[0040] The first end (lower cross section of the electrode assembly) 101 and the second end (upper cross section of the electrode assembly) 102 of the electrode assembly 10 may be flat and parallel to each other. In the first embodiment, the electrode assembly 10 is not provided with a center pin, but a center pin (not shown) may be provided at the position of the winding axis.

[0041] The case 20 accommodates the electrode assembly 10 while facing the first end 101 of the two ends of the electrode assembly 10 with the bottom inner surface. At this time, the electrode assembly 10 is coated with an insulating sheet 14 on the first end 101 and the second end 102 and the side surface, and is embedded in the case 20 with an electrolyte solution. As an example, the case 20 is formed into a cylindrical body that accommodates the jelly roll type electrode assembly 10, and the cap assembly 60 closes and seals the opening 21 of the cylindrical case 20.

[0042] 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 pulled into the first end 101 and the second end 102 , respectively.

[0043] When the electrode assembly 10 is accommodated in the shell 20, the first electrode tab 51 is first electrically and mechanically connected to the bottom inner surface of the shell 20, and the second electrode tab 52 is then electrically and mechanically connected to the inner surface of the terminal plate 63 of the cap assembly 60.

[0044] The cap plate 31 of the cap assembly 60 is coupled to the case 20 while facing the second end 102 of the electrode assembly 10 to cover the opening 21. At this time, the terminal plate 63 is next connected to the second electrode tab 52 while being coupled to the cap plate 31 using the heat fusion member 34.

[0045] The first connection connects the first electrode tab 51 and the case 20 to each other through the conductive double-sided adhesive member 40. The second connection connects the second electrode tab 52 and the terminal plate 63 to each other through the conductive double-sided adhesive member 40.

[0046] The conductive double-sided adhesive member 40 can be formed of a conductive double-sided tape or an anisotropic conductive film (ACF), which facilitates the first connection and the second connection process. For convenience, the conductive double-sided tape is used as an example. As an example, the conductive double-sided adhesive member 40 may include a first conductive double-sided tape 41 and a second conductive double-sided tape 42.

[0047] Hereinafter, a case where the first electrode 11 and the second electrode 12 are a negative electrode and a positive electrode is 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.

[0048] The first electrode (negative electrode) 11 is formed into a long strip and includes a negative electrode coated portion and a negative electrode uncoated portion. The negative electrode coated portion is an area where a negative electrode active material layer is coated on a current collector of a metal foil (e.g., copper foil), and the negative electrode uncoated portion is an area where the active material is not coated. The negative electrode uncoated portion can be provided at one end in the length direction of the negative electrode.

[0049] The second electrode (positive electrode) 12 is formed into a long strip and includes a positive electrode coated portion and a positive electrode uncoated portion. The positive electrode coated portion is an area where the positive electrode active material layer is coated on a current collector of a metal foil (e.g., aluminum foil), and the positive electrode uncoated portion is an area where the active material is not coated. The positive electrode uncoated portion can be provided at one end in the longitudinal direction of the positive electrode.

[0050] The case 20 allows the electrode assembly 10 to be inserted into an opening 21 formed on one side thereof, and has a space for accommodating the electrode assembly 10 and the electrolyte therein. For example, the case 20 is formed in a cylindrical shape with a height H lower than a diameter D, and has a circular opening 21 so as to insert the cylindrical electrode assembly 10 corresponding to its internal space.

[0051] 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 provided outside the cap plate 31 and is electrically insulated and attached to the outer surface of the cap plate 31 by interposing the heat fusion member 34 therebetween.

[0052] 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 thermal fusion member 34 and the terminal hole 311 of the cap plate 31 to protrude toward the electrode assembly 10, and the second electrode tab 52 is electrically and mechanically connected to the inner surface of the tab connection portion 632.

[0053] More specifically, the first connection electrically and mechanically connects the lower surface of the first electrode tab 51 and the inner surface of the housing 20, which face each other, using a first conductive double-sided tape 41 interposed therebetween. The first conductive double-sided tape 41 makes the first connection process simple and convenient, and improves the degradation of electrical characteristics caused by poor welding.

[0054] The second connection is made by interposing the second conductive double-sided tape 42 between the upper surface of the second electrode tab 52 facing each other and the lower surface of the terminal plate 63, electrically and mechanically connecting them. In other words, the second connection is made by interposing the second conductive double-sided tape 42 between the upper surface of the second electrode tab 52 facing each other and the lower surface of the tab connection portion 632. The second conductive double-sided tape 42 makes the second connection process simple and convenient, and improves the degradation of electrical characteristics caused by poor welding.

[0055] The first and second connections using the first and second conductive double-sided tapes 41 and 42 prevent the presence of foreign metal welding debris and heat that may occur during laser welding, ultrasonic welding, or resistance welding, thereby eliminating safety risks within the battery. The first and second connections prevent degradation of battery characteristics due to poor welding depending on the condition of the housing 20 and the lid assembly 60 during the welding process. The first and second connections can be partially supplied by a feeder and using an attachment jig to supply the first and second conductive double-sided tapes 41 and 42, thereby requiring simpler equipment compared to existing welding equipment.

[0056] Figure 4 It is used between the second electrode terminal piece and the terminal plate. Figure 2 and Figure 3 An enlarged cross-sectional view of a portion of the second conductive double-sided tape for electrical and mechanical connection. The first connection and the second connection form the same configuration, so reference is made to Figure 4 Describe the second connection.

[0057] As an example, the second conductive double-sided tape 42 includes a conductive mesh portion 421 having conductivity and formed into a mesh structure, and a rubber adhesive 422 filled around the conductive mesh portion 421 to form a second connection. Since the rubber adhesive 422 does not react with the electrolyte solution, the second connection can be continuously maintained.

[0058] Meanwhile, an insulating member 61 is provided between the second electrode tab 52 and the cap plate 31. As an example, the insulating member 61 is provided on the upper side of the second electrode tab 52 and is attached to the inner surface of the cap plate 31. The 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.

[0059] As an example, the insulating member 61 has 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 inner side, passes through the terminal hole 311 of the cap plate 31 and the through hole 611 of the insulating member 61 to protrude toward the electrode assembly 10, and the second electrode tab 52 is electrically and mechanically connected to the inner surface of the tab connection portion 632 with the second conductive double-sided tape 42 interposed therebetween.

[0060] On the other hand, reference Figure 1 In the rechargeable battery 100 of the first embodiment, when the opening 21 of the case 20 is closed and sealed by the cap assembly 60, the height H is set to the distance between the outer planes of the case 20 and the flange portion 631, and the battery diameter D is set to the outer circumference of the case 20. In this case, the ratio of the height H to the battery diameter D is 1 or less (H / D ≤ 1). Therefore, the rechargeable battery 100 of the first embodiment can be formed into a thin coin or button type as a coin-type battery or button-type battery.

[0061] Hereinafter, a second embodiment of the present invention will be described. Comparing the first embodiment and the second embodiment, the same configurations are omitted, and different configurations are described in the second embodiment.

[0062] Figure 5 is a perspective view showing a rechargeable battery according to a second embodiment of the present invention, Figure 6 yes Figure 5 An exploded perspective view of a rechargeable battery in Figure 7 It is along Figure 5 A cross-sectional view taken along line VII-VII in FIG.

[0063] Reference Figures 5 to 7 In the cap assembly 30 of the rechargeable battery 200 according to the second embodiment, the terminal plate 33 includes a flange portion 331 and a protruding terminal 332. The flange portion 331 is provided between the cap plate 31 and the electrode assembly 10, is provided within the step 621 of the insulating member 62, and is electrically insulated and attached to the inner surface of the cap plate 31 with the heat fusion member 34 interposed therebetween.

[0064] In the terminal plate 33, the protruding terminal 332 protrudes from the center of the flange portion 331 to the outside to pass through the through hole 341 of the thermal fusion member 34 and the terminal hole 311 of the cover plate 31, and the second electrode terminal tab 52 is electrically and mechanically connected to the inner surface of the flange portion 331 with the second conductive double-sided tape 42 interposed therebetween.

[0065] The second connection is achieved by electrically and mechanically connecting the second electrode tab 52 with the second conductive double-sided tape 42 interposed between the upper surface of the second electrode tab 52 and the lower surface of the terminal plate 33. In other words, the second connection is achieved by interposing the second conductive double-sided tape 42 between the upper surface of the second electrode tab 52 and the lower surface of the flange portion 331. The second conductive double-sided tape 42 makes the second connection process simple and convenient, and improves the degradation of electrical characteristics caused by poor welding.

[0066] The insulating member 62 is disposed on an upper side of the second electrode tab 52, attached to the inner surface of the cap plate 31, and further extends to the inner surface of the flange portion 331. The 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 portion 331 and the electrode assembly 10.

[0067] As an example, the insulating member 62 has a step 621 corresponding to the outer diameter of the thermal fusion member 34. Thus, the protruding terminal 332 protrudes outward from the center of the flange portion 331 and protrudes outward through the through-hole 341 of the thermal fusion member 34 and the terminal hole 311 of the cover plate 31. The flange portion 331 is electrically and mechanically connected to the second electrode tab 52 on the open inner surface of the through-hole 622 of the insulating member 62 using the second conductive double-sided tape 42.

[0068] Hereinafter, an embodiment for simplifying the process of connecting an external tab of a rechargeable battery to a kit is described. In the present invention, a kit refers to a device having a rechargeable battery.

[0069] Figure 8 1 is a cross-sectional view of an external terminal block and a sleeve electrically connected to a rechargeable battery of the first embodiment. Figure 8 The third connection and the fourth connection electrically connect the first external tab 53 and the second external tab 54 of the rechargeable battery 100 to the kit S, respectively.

[0070] The third connection connects the terminal plate 63 to the kit S. Specifically, a third conductive double-sided adhesive member, ie, a third conductive double-sided tape 43 is connected between the first external tab 53 connected to the outer surface of the flange portion 631 and the kit S.

[0071] The fourth connection connects the housing 20 to the sleeve S. Specifically, a fourth conductive double-sided adhesive member, ie, a fourth conductive double-sided tape 44 is connected between the second external tab 54 connected to the outer surface of the housing 20 and the sleeve S.

[0072] The third and fourth conductive double-sided tapes 43 and 44 simplify and facilitate the process of connecting the first and second external tabs 53 and 54 of the rechargeable battery 100 to the third and fourth connections of the kit S, and improve deterioration of electrical characteristics due to poor welding.

[0073] Furthermore, the third and fourth connections are possible to some extent by feeders and using an attachment jig to supply the third and fourth conductive double-sided tapes 43 and 44 , thus requiring simpler equipment compared to existing soldering equipment.

[0074] Figure 9 FIG2 is a cross-sectional view of an external terminal block and a housing for electrically connecting a rechargeable battery according to a second embodiment. Figure 9 , the third connection connects the terminal plate 33 to the kit S, in detail, the third conductive double-sided adhesive member, i.e., the third conductive double-sided tape 243 is connected between the first external terminal 253 connected to the outer surface of the protruding terminal 332 and the kit S.

[0075] The third conductive double-sided tape 243 makes the process of connecting the first external tab 253 of the rechargeable battery 200 to the third connection of the kit S simple and convenient, and improves the degradation of electrical characteristics due to poor welding.

[0076] While the invention has been described in connection with what are presently considered to be practical 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.

[0077] Reference numerals

[0078] 10: Electrode assembly 11: First electrode (negative electrode)

[0079] 12: Second electrode (positive electrode) 13: Separator

[0080] 20: Shell 21: Opening

[0081] 30, 60: Cover assembly 31: Cover plate

[0082] 33, 63: Terminal plate 34: Thermal fusion component

[0083] 40: Conductive double-sided adhesive member 41: First conductive double-sided adhesive tape

[0084] 42: Second conductive double-sided tape 43, 243: Third conductive double-sided tape

[0085] 44: fourth conductive double-sided tape 51: first electrode terminal block

[0086] 52: Second electrode tab 53, 253: First external tab

[0087] 54: Second external terminal piece 61, 62: Insulation member

[0088] 100, 200: Rechargeable battery 101: First end (lower cross section)

[0089] 102: Second end (upper cross section) 311: Terminal hole

[0090] 331, 631: flange portion 332: protruding terminal

[0091] 341: Through hole 421: Conductive mesh part

[0092] 422: Rubber adhesive 611, 622: Through hole

[0093] 621: Step 632: Lug connection part

[0094] D: battery diameter H: height

[0095] S: Kit

Claims

1. A rechargeable battery comprising: an electrode assembly having a first electrode tab and a second electrode tab; a housing accommodating the electrode assembly and electrically connected to the first electrode tab; a cap assembly comprising a cap plate coupled to the opening of the case, a terminal plate coupled to the cap plate in an insulating state and electrically connected to the second electrode tab, and a thermal fusion member interposed between the cap plate and the terminal plate, wherein the terminal plate extends through a through hole of the thermal fusion member and a terminal hole of the cap plate; as well as a conductive double-sided adhesive member applied to at least one of a first connection between the first electrode tab and the housing and a second connection between the second electrode tab and the terminal plate, wherein the conductive double-sided adhesive member is formed of a conductive double-sided adhesive tape, wherein the conductive double-sided tape is formed of a conductive mesh portion formed in a conductive mesh structure and a rubber adhesive filled around the conductive mesh portion to form the first connection and the second connection, so as to continuously maintain the electrical connection between the first electrode terminal tab and the housing and the electrical connection between the second electrode terminal tab and the terminal plate, and The through hole of the thermal fusion member is larger than the terminal hole of the cap plate.

2. The rechargeable battery according to claim 1 , wherein the conductive double-sided tape comprises a first conductive double-sided tape interposed between a lower surface of the first electrode tab and an inner surface of the case facing each other, and the first connection electrically and mechanically connects the two using the first conductive double-sided tape.

3. The rechargeable battery according to claim 1 , wherein the conductive double-sided tape includes a second conductive double-sided tape interposed between the upper surface of the second electrode tab and the lower surface of the terminal plate facing each other, and the second connection utilizes the second conductive double-sided tape to electrically and mechanically connect the two.

4. The rechargeable battery according to claim 3, wherein The terminal board includes: a flange portion provided on the outer side of the cover plate and electrically insulated and attached to the outer surface of the cover plate by inserting the heat fusion member, and a tab connecting portion protruding from a center of the flange portion to an inner side of the flange portion and protruding toward the electrode assembly through the through hole of the thermal fusion member and the terminal hole of the cap plate, and The second conductive double-sided tape is electrically and mechanically connected between the second electrode tab and the inner surface of the tab connection portion.

5. The rechargeable battery according to claim 3, wherein The terminal board includes: a flange portion provided on the inner side of the cover plate and electrically insulatedly attached to the inner surface of the cover plate with the heat fusion member interposed therebetween, and a protruding terminal protruding from the center of the flange portion to the outside and passing through the through hole of the thermal fusion member and the terminal hole of the cover plate, and The second conductive double-sided tape mechanically and electrically connects between the second electrode tab and an inner surface of the flange portion.

6. The rechargeable battery according to claim 1, wherein The terminal board includes: a flange portion provided on the outer side of the cover plate and electrically insulated and attached to the outer surface of the cover plate by inserting the heat fusion member, and a tab connecting portion protruding from the center of the flange portion to the inner side of the flange portion and protruding toward the electrode assembly through the through hole of the thermal fusion member and the terminal hole of the cap plate, and In the third connection of connecting the terminal block to the kit, A third conductive double-sided adhesive member is connected between the first external tab connected to the outer surface of the flange portion and the kit.

7. The rechargeable battery according to claim 6, wherein In a fourth connection connecting the housing to the kit, A fourth conductive double-sided adhesive member is connected between a second external tab connected to the outer surface of the housing and the kit.

8. The rechargeable battery according to claim 1, wherein The terminal board includes: a flange portion provided on the inner side of the cover plate and electrically insulated and attached to the inner surface of the cover plate by the heat fusion member interposed between the flange portion and the cover plate, and a protruding terminal protruding from the center of the flange portion to the outside and passing through the through hole of the thermal fusion member and the terminal hole of the cover plate, and In the third connection of connecting the terminal block to the kit, A third conductive double-sided adhesive member is connected between the first external tab connected to the outer surface of the protruding terminal and the kit.

Images