KR20250068295A - Electrode assembly and rechargeable battery comprising the same - Google Patents

Abstract

The present invention relates to an electrode assembly and a secondary battery including the same. The electrode assembly according to the present invention includes an electrode laminate in which a first electrode, a separator, and a second electrode are alternately laminated and wound, the second electrode being positioned at the outermost layer, and a conductive wire provided on the outer surface of the second electrode and including a conductive material.

Description

Electrode assembly and secondary battery comprising the same {ELECTRODE ASSEMBLY AND RECHARGEABLE BATTERY COMPRISING THE SAME}

The present invention relates to an electrode assembly and a secondary battery including the same.

Secondary batteries, unlike primary batteries, are rechargeable and have the potential to be made small and large-capacity, so they have been researched and developed extensively in recent years. As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing.

Secondary batteries are classified into coin-shaped batteries, cylindrical batteries, square batteries, and pouch-shaped batteries according to the shape of the battery case. In a secondary battery, the electrode assembly mounted inside the battery case is a power generation element capable of charging and discharging, which is composed of a laminated structure of electrodes and a separator.

Electrode assemblies can be roughly classified into a jelly-roll type in which a separator is interposed between sheet-shaped positive and negative electrodes coated with active materials, a stack type in which a plurality of positive and negative electrodes are sequentially laminated with a separator interposed between them, and a stack/folding type in which stack-type unit cells are wound with a long separator film.

Dual-purpose, jelly-roll electrode assemblies are widely used because they are easy to manufacture and have the advantages of high energy density per weight.

Cylindrical batteries including conventional jelly roll-type electrode assemblies have a problem in that cell performance deteriorates due to high resistance due to a small physical contact area between the negative tab and the can housing the electrode assembly.

One aspect of the present invention is to provide an electrode assembly in which the contact area between the electrode and the can is widened and can be easily connected, and a secondary battery including the same.

An electrode assembly according to an embodiment of the present invention includes an electrode laminate in which a first electrode, a separator, and a second electrode are alternately laminated and wound, the second electrode being positioned at the outermost layer, and a conductive wire provided on an outer surface of the second electrode and including a conductive material.

Meanwhile, a secondary battery according to an embodiment of the present invention includes an electrode assembly according to an embodiment of the present invention and a can accommodating the electrode assembly.

According to the present invention, in an electrode assembly, a second electrode is positioned at the outermost surface of an electrode laminate in which a first electrode, a separator, and a second electrode are alternately laminated and wound, and a conductive wire is provided on the outer surface of the second electrode, so that the contact area between the second electrode and the can is widened and easy contact can be made. Accordingly, resistance can be reduced and cell performance characteristics can be improved.

In particular, in a secondary battery including an electrode assembly, a conductive wire is wound on the outer surface of a second electrode collector of a second electrode positioned at the outermost side in the winding direction and connected to a can accommodating the electrode assembly, so that the contact area between the second electrode and the can increases, thereby reducing resistance and facilitating connection, thereby reducing the resistance between the second electrode and the can, and the cell performance characteristics can be significantly improved due to the reduced resistance.

FIG. 1 is a perspective view showing an electrode assembly according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a portion of a conductive wire in an electrode assembly according to the first embodiment of the present invention.
FIG. 3 is a perspective view showing an example of a fixed state of a conductive wire in an electrode assembly according to the first embodiment of the present invention.
FIG. 4 is a perspective view showing another example of a fixed state of a conductive wire in an electrode assembly according to the first embodiment of the present invention.
Figure 5 is a perspective view showing an electrode assembly according to a second embodiment of the present invention.
FIG. 6 is a perspective view showing a portion of a conductive wire in an electrode assembly according to a second embodiment of the present invention.
Figure 7 is a perspective view showing a secondary battery according to the first embodiment of the present invention.
Figure 8 is a cross-sectional view showing a secondary battery according to the first embodiment of the present invention.
Figure 9 is a perspective view showing a secondary battery according to the second embodiment of the present invention.
Figure 10 is a cross-sectional view showing a secondary battery according to the second embodiment of the present invention.

The purpose, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments thereof, taken in conjunction with the accompanying drawings. In this specification, when reference numerals are given to components in each drawing, it should be noted that, as far as possible, the same components are given the same numerals even if they are shown in different drawings. In addition, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in describing the present invention, a detailed description of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

Electrode assembly according to the first embodiment

FIG. 1 is a perspective view showing an electrode assembly according to a first embodiment of the present invention, and FIG. 2 is a perspective view showing a part of a conductive wire in the electrode assembly according to the first embodiment of the present invention.

Referring to FIGS. 1 and 2, an electrode assembly (100) according to a first embodiment of the present invention includes an electrode laminate (110) in which a first electrode (111), a separator (114, 115), and a second electrode (112) are alternately laminated and wound, and the second electrode (112) is positioned at the outermost side, and a conductive wire (120) (Wire) provided on an outer surface of the second electrode (112) and including a conductive material. In addition, the electrode assembly (100) according to the first embodiment of the present invention may further include a sealing tape (140) (Seal tape) wrapping the electrode laminate (110) and an electrode tab (130) connected to the electrode (113).

Hereinafter, the electrode assembly, which is the first embodiment of the invention, will be described in more detail.

The electrode laminate (110) is a power plant capable of charging and discharging, and forms a structure in which electrodes (113) and separators (114, 115) are combined and alternately laminated. Here, the electrode laminate (110) can be formed in a coiled shape in which electrodes (113) and separators (114, 115) are alternately combined. At this time, the electrode laminate (110) can be wound in a cylindrical shape wound around a central axis (C).

The electrode (113) may include a first electrode (111) and a second electrode (112). In addition, the separator (114, 115) electrically insulates the first electrode (111) and the second electrode (112) by separating them.

The first electrode (111) may include a first electrode current collector and a first electrode active material coated on one surface of the first electrode current collector. At this time, the first electrode (111) may include a first electrode non-laminated region, which is a region where the first electrode active material is not laminated.

The first electrode current collector may be made of a metal foil. At this time, the first electrode current collector may be made of a foil made of, for example, aluminum.

The first electrode active material may be composed of lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound or mixture containing at least one of these.

The second electrode (112) may include a second electrode current collector and a second electrode active material coated on one surface of the second electrode current collector. At this time, the second electrode (112) may include a second electrode non-laminated region, which is a region where the second electrode active material is not laminated.

The second electrode current collector may be made of a metal foil. At this time, the second electrode current collector may be made of, for example, a copper foil made of a copper (Cu) material.

The second electrode active material may be formed of, for example, artificial graphite, lithium metal, lithium alloy, carbon, petroleum coke, activated carbon, graphite, silicon compound, tin compound, titanium compound, or an alloy thereof. At this time, the second electrode active material may further include, for example, non-graphite SiO (silica) or SiC (silicon carbide).

The second electrode (112) may be positioned at the outermost surface of the electrode stack (110). At this time, the other surface of the second electrode current collector of the second electrode (112) may be positioned at the outermost surface of the electrode stack (110).

That is, when the electrode laminate (110) is wound, the direction toward the core is referred to as the inner (I) direction, and the direction toward the outermost part in the winding direction is referred to as the outer (O) direction, the other side of the second electrode current collector can be positioned on the outermost exposed surface in the electrode laminate (110) in the outer (O) direction.

Meanwhile, the first electrode (111) may be formed as an anode, and the second electrode (112) may be formed as a cathode.

The separator (114, 115) is made of an insulating material and can insulate between the first electrode (111) and the second electrode (112).

In addition, the separator (114, 115) may be a multilayer film manufactured by, for example, microporous polyethylene, polypropylene or a combination thereof, or a polymer film for a solid polymer electrolyte or a gel-type polymer electrolyte such as polyvinylidene fluoride, polyethylene oxide, polyacrylonitrile or polyvinylidene fluoride hexafluoropropylene copolymer.

The electrode tab (130) is attached to or extended from the electrode (113) and electrically connected to the electrode (113).

The electrode tab (130) may include a first electrode tab (131) extending from the first electrode (111) to one side in a direction parallel to the winding center axis (C) of the electrode laminate (110) and a second electrode tab (132) extending from the second electrode (112) to the other side.

The sealing tape (140) can wrap the electrode laminate (110) to prevent unwinding.

The sealing tape (140) can wrap the first part of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the sealing tape (140) can wrap the upper and lower parts of the electrode laminate (110) in the direction of the winding center axis (C).

The conductive wire (120) is provided on the outer surface of the second electrode (112) and includes a conductive material.

Additionally, the conductive wire (120) can be wound along the outer surface of the second electrode (112). Accordingly, contact between the second electrode (112) and the can can be facilitated.

In addition, the conductive wire (120) can wrap the second portion of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the conductive wire (120) can wrap the central portion of the electrode laminate (110) in the direction of the winding center axis (C).

And, the conductive wire (120) may include a metal material. At this time, the conductive wire (120) may include, for example, a copper material.

Meanwhile, the cross-section of the conductive wire (120) may be provided in a circular shape. And, the diameter (D) of the conductive wire (120) may be formed to be greater than the thickness of the sealing tape (140). Here, the diameter (D) of the conductive wire (120) may be, for example, 50 um to 60 um.

Accordingly, the diameter (D) of the conductive wire (120) is formed to be a minimum value of 50 um or more, so that the effect of expanding the contact area by coming into contact with the external can can be maximized. In particular, when a sealing tape (140) wrapping the electrode laminate (110) is provided, the diameter (D) of the conductive wire (120) can be formed to be a thickness greater than or equal to the thickness of the sealing tape (140), so that the contact with the can can be significantly smoother. Meanwhile, the diameter (D) of the conductive wire (120) is formed to be a maximum value of 60 um or less, so that the overall outer diameter of the electrode assembly (100) is prevented from increasing, so that it can be inserted into the can, and the amount of increase in the outer diameter of the conductive wire (120) is also reduced, so that an optimal effect can be exhibited.

The conductive wire (120) can be wrapped around the electrode laminate (110) 1 to 10 times, for example.

Accordingly, since the conductive wire (120) is wrapped around the electrode laminate (110) at least once, the circular shape of the electrode laminate (110) may not be damaged. Here, if the conductive wire (120) is wrapped less than once, the electrode laminate (110) becomes a shape that is slightly offset from the circular shape, and the connection with the can is also connected only at a slightly offset portion, and the problem of uneven connection occurs, but this can be prevented or significantly improved by the conductive wire (120) being wrapped at least once. In addition, if the conductive wire (120) is wrapped less than once, the resistance can be significantly increased.

And, as the conductive wire (120) is wrapped around the electrode laminate (110) less than the maximum number of 10 times, the fairness and efficiency can be significantly improved. Here, if the conductive wire (120) is wrapped more than 10 times, the weight and unit price of the cell can significantly increase.

Meanwhile, the conductive wire (120) can be specifically wrapped around the electrode laminate (110) 2 to 3 times, for example.

FIG. 3 is a perspective view showing an example of a fixed state of a conductive wire in an electrode assembly according to the first embodiment of the present invention.

Referring to FIG. 3, the conductive wire (120) may be fixed to a sealing tape (140) positioned at the upper and lower portions of the electrode laminate (110) on both sides (121, 122) in the longitudinal direction, for example.

At this time, when attaching the sealing tape (140) to the electrode laminate (110), both sides (121, 122) of the conductive wire (120) can be attached together. Here, the both sides (121, 122) of the conductive wire (120) can be positioned between the sealing tape (140) and the electrode laminate (110).

FIG. 4 is a perspective view showing another example of a fixed state of a conductive wire in an electrode assembly according to the first embodiment of the present invention.

Referring to FIG. 4, as another example, the conductive wire (120') may be fixed to the other surface of the second electrode collector at both ends (121, 122) in the longitudinal direction.

At this time, the conductive wire (120') can be fixed by welding both sides (121, 122) in the longitudinal direction to the other surface of the second electrode current collector.

Referring to FIG. 1, the electrode assembly (100) according to the first embodiment of the present invention configured as described above positions the second electrode (112) at the outermost surface of the electrode laminate (110) and positions the conductive wire (120) on the outer surface of the second electrode (112), thereby increasing the contact area between the second electrode (112) and the can and enabling easy contact. Accordingly, the resistance can be reduced and the cell performance characteristics can be improved.

In particular, the conductive wire (120) is wound on the outer surface of the second electrode current collector of the second electrode (112) located at the outermost side in the winding direction and connected to the can that accommodates the electrode assembly (100), so that the contact area between the second electrode (112) and the can is widened, thereby reducing resistance and facilitating connection, thereby reducing the resistance between the second electrode (112) and the can, and the cell performance characteristics can be significantly improved due to the reduced resistance.

Electrode assembly according to the second embodiment

Below, an electrode assembly according to the second embodiment will be described.

FIG. 5 is a perspective view showing an electrode assembly according to a second embodiment of the present invention, and FIG. 6 is a perspective view showing a part of a conductive wire in an electrode assembly according to the second embodiment of the present invention.

Referring to FIGS. 5 and 6, an electrode assembly (200) according to a second embodiment of the present invention includes an electrode laminate (110) in which a first electrode (111), a separator (114, 115), and a second electrode (112) are alternately laminated and wound, and the second electrode (112) is positioned at the outermost side, and a conductive wire (220) (Wire) provided on an outer surface of the second electrode (112) and including a conductive material. In addition, the electrode assembly (200) according to the second embodiment of the present invention may further include a sealing tape (140) (Seal tape) wrapping the electrode laminate (110) and an electrode tab (130) connected to the electrode (113).

The electrode assembly (200) according to the second embodiment of the present invention has a difference in the shape of the conductive wire (220) compared to the electrode assembly according to the first embodiment described above. Therefore, in this embodiment, overlapping content with the first embodiment is omitted or briefly described, and the description is centered on the differences.

In more detail, the electrode laminate (110) is a power plant capable of charging and discharging, and forms a structure in which electrodes (113) and separators (114, 115) are combined and alternately laminated. Here, the electrode laminate (110) can be formed in a coiled shape in which the electrodes (113) and separators (114, 115) are alternately combined. At this time, the electrode laminate (110) can be wound in a cylindrical shape wound around a central axis (C).

The electrode (113) may include a first electrode (111) and a second electrode (112). In addition, the separator (114, 115) electrically insulates the first electrode (111) and the second electrode (112) by separating them.

The first electrode (111) may include a first electrode current collector and a first electrode active material coated on one surface of the first electrode current collector.

The first electrode current collector may be made of a metal foil. At this time, the first electrode current collector may be made of a foil made of, for example, aluminum.

The second electrode (112) may include a second electrode current collector and a second electrode active material coated on one surface of the second electrode current collector.

The second electrode current collector may be made of a metal foil. At this time, the second electrode current collector may be made of, for example, a copper foil made of a copper (Cu) material.

The second electrode (112) may be positioned at the outermost surface of the electrode stack (110). At this time, the other surface of the second electrode current collector of the second electrode (112) may be positioned at the outermost surface of the electrode stack (110).

Meanwhile, the first electrode (111) may be formed as an anode, and the second electrode (112) may be formed as a cathode.

The electrode tab (130) is attached to or extended from the electrode (113) and electrically connected to the electrode (113).

The electrode tab (130) may include a first electrode tab (131) extending from the first electrode (111) to one side in a direction parallel to the winding center axis (C) of the electrode laminate (110) and a second electrode tab (132) extending from the second electrode (112) to the other side.

The sealing tape (140) can wrap the electrode laminate (110) to prevent unwinding.

In addition, the sealing tape (140) can wrap the first part of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the sealing tape (140) can wrap the upper and lower parts of the electrode laminate (110) in the direction of the winding center axis (C).

The conductive wire (220) is provided on the outer surface of the second electrode (112) and includes a conductive material.

Additionally, the conductive wire (220) can be wound along the outer surface of the second electrode (112).

In addition, the conductive wire (220) can wrap the second portion of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the conductive wire (220) can wrap the central portion of the electrode laminate (110) in the direction of the winding center axis (C).

Additionally, the conductive wire (220) may include a copper material.

Meanwhile, the cross-section of the conductive wire (220) may be provided in a square shape. Accordingly, the contact surface between the conductive wire (220) and the can (11) may be widened, so that the resistance may be significantly reduced. At this time, the thickness (T) and width (W) of the conductive wire (220) may be, for example, 50 um to 60 um. In addition, the thickness (T) of the conductive wire (220) may be formed to be greater than the thickness of the sealing tape (140).

Meanwhile, the conductive wire (220) can be wrapped around the electrode laminate (110) 1 to 10 times.

And, the conductive wire (220) can be fixed to a sealing tape (140) positioned at the upper and lower portions of the electrode laminate (110) on both sides (121, 122) in the longitudinal direction, for example.

And, the conductive wire (220) can be fixed to the other surface of the second electrode collector at both ends (121, 122) in the longitudinal direction.

Secondary battery according to the first embodiment

Below, a secondary battery according to the first embodiment of the present invention will be described.

Fig. 7 is a perspective view showing a secondary battery according to the first embodiment of the present invention, and Fig. 8 is a cross-sectional view showing a secondary battery according to the first embodiment of the present invention. Here, in Fig. 8, the top cap is excluded for convenience of explanation.

Referring to FIGS. 7 and 8, a secondary battery (10) according to a first embodiment of the present invention includes an electrode assembly (100) and a can (11) accommodating the electrode assembly (100). The electrode assembly (100) includes an electrode laminate (110) in which a first electrode (111), a separator (114, 115), and a second electrode (112) are alternately laminated and wound, and the second electrode (112) is positioned at the outermost side, and a conductive wire (120) (Wire) provided on an outer surface of the second electrode (112) and including a conductive material. In addition, the secondary battery (10) according to the first embodiment of the present invention may further include a top cap (13) covering an upper portion of the can (11).

Meanwhile, in the secondary battery (10) according to the first embodiment of the present invention, the electrode assembly (100) may further include a sealing tape (140) wrapping the electrode laminate (110) and an electrode tab (130) connected to the electrode (113).

The secondary battery (10) according to the first embodiment of the present invention relates to a secondary battery (10) including the electrode assembly (100) according to the first embodiment described above. Therefore, in this embodiment, any content overlapping with the above-described embodiments will be omitted or briefly described, and differences will be described.

In more detail, the secondary battery (10) according to the first embodiment of the present invention includes an electrode assembly (100) and a can (11) in which the electrode assembly (100) is accommodated. At this time, the secondary battery (10) according to the first embodiment of the present invention may further include an electrolyte accommodated inside the can (11).

The can (11) may be formed with a receiving portion (11a) that is opened upward to receive the electrode assembly (100). At this time, the can (11) may be formed in a cylindrical shape, for example. In addition, the can (11) may be formed of a metal material so that electricity may be conducted therethrough.

The top cap (13) can cover the opened receiving portion (11a) of the can (11).

The electrode laminate (110) can be formed in a rolled form in which electrodes (113) and separators (114, 115) are alternately assembled.

The electrode (113) may include a first electrode (111) and a second electrode (112). In addition, the separator (114, 115) electrically insulates the first electrode (111) and the second electrode (112) by separating them.

The first electrode (111) may include a first electrode current collector (111a) and a first electrode active material (111b) coated on one surface of the first electrode current collector (111a).

The second electrode (112) may include a second electrode current collector (112a) and a second electrode active material (111b) coated on one surface of the second electrode current collector (112a).

The second electrode current collector (112a) may be made of a metal foil. At this time, the second electrode current collector (112a) may be made of, for example, a copper foil made of a copper (Cu) material.

The second electrode (112) may be positioned at the outermost surface of the electrode stack (110). At this time, the other surface of the second electrode current collector (112a) of the second electrode (112) may be positioned at the outermost surface of the electrode stack (110).

Meanwhile, the first electrode (111) may be formed as an anode, and the second electrode (112) may be formed as a cathode.

The electrode tab (130) is attached to or extended from the electrode (113) and electrically connected to the electrode (113).

The electrode tab (130) may include a first electrode tab (131) extending from the first electrode (111) to one side in a direction parallel to the winding center axis (C) of the electrode laminate (110) and a second electrode tab (132) extending from the second electrode (112) to the other side.

When referring to FIG. 7, the first electrode tab (131) may be formed in the direction in which the top cap (13) is positioned in the upper direction, and the second electrode tab (132) may be positioned toward the bottom surface (11b) of the receiving portion (11a) of the can (11) in the lower direction.

In addition, the second electrode tab (132) can be in direct contact with the can (11). At this time, the end of the second electrode tab (132) can be fixed to the bottom surface (11b) of the receiving portion (11a) of the can (11).

Meanwhile, the first electrode tab (131) can be electrically connected to the top cap (13).

The sealing tape (140) can wrap the electrode laminate (110) to prevent unwinding.

In addition, the sealing tape (140) can wrap the first part of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the sealing tape (140) can wrap the upper and lower parts of the electrode laminate (110) in the direction of the winding center axis (C).

In addition, the sealing tape (140) may include a substrate film (141) and an adhesive layer (142) provided on one surface of the substrate film (141).

The conductive wire (120) is provided on the outer surface of the second electrode (112) and includes a conductive material.

Additionally, the conductive wire (120) can be wound along the outer surface of the second electrode (112).

In addition, the conductive wire (120) can wrap the second portion of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the conductive wire (120) can wrap the central portion of the electrode laminate (110) in the direction of the winding center axis (C).

Additionally, the conductive wire (120) may include a copper material.

Meanwhile, the cross-section of the conductive wire (120) may be provided in a circular shape. And, the diameter of the conductive wire (120) may be formed to be greater than the thickness (t) of the sealing tape (140).

The conductive wire (120) can have its inner side in contact with the electrode laminate (110) in the winding direction and its outer side joined to the can (11).

Referring to FIGS. 7 and 8, the secondary battery (10) according to the first embodiment of the present invention configured as described above positions the second electrode (112) at the outermost surface of the electrode laminate (110) in the electrode assembly (100), and positions the conductive wire (120) on the outer surface of the second electrode (112), thereby increasing the contact area between the second electrode (112) and the can (11) and enabling easy contact. Accordingly, the resistance can be reduced and the cell performance characteristics can be improved.

In particular, the conductive wire (120) is wound on the outer surface of the second electrode current collector (112a) of the second electrode (112) located at the outermost side in the winding direction and connected to the can (11) that accommodates the electrode assembly (100), so that the contact area between the second electrode (112) and the can (11) increases, thereby reducing resistance and facilitating connection, thereby reducing the resistance between the second electrode (112) and the can (11), and the cell performance characteristics can be significantly improved due to the reduced resistance.

Secondary battery according to the second embodiment

Below, a secondary battery according to a second embodiment of the present invention will be described.

Fig. 9 is a perspective view showing a secondary battery according to a second embodiment of the present invention, and Fig. 10 is a cross-sectional view showing a secondary battery according to a second embodiment of the present invention. Here, in Fig. 10, the top cap is excluded for convenience of explanation.

Referring to FIGS. 9 and 10, a secondary battery (20) according to a second embodiment of the present invention includes an electrode assembly (200) and a can (11) accommodating the electrode assembly (200). The electrode assembly (200) includes an electrode laminate (110) in which a first electrode (111), a separator (114, 115), and a second electrode (112) are alternately laminated and wound, and the second electrode (112) is positioned at the outermost side, and a conductive wire (220) (Wire) provided on an outer surface of the second electrode (112) and including a conductive material. In addition, the secondary battery (20) according to the second embodiment of the present invention may further include a top cap (13) covering an upper portion of the can (11).

Meanwhile, in the secondary battery (20) according to the second embodiment of the present invention, the electrode assembly (200) may further include a sealing tape (140) wrapping the electrode laminate (110) and an electrode tab (130) connected to the electrode (113).

A secondary battery (20) according to the second embodiment of the present invention relates to a secondary battery (20) including an electrode assembly (200) according to the second embodiment described above. Therefore, in this embodiment, any content overlapping with the above-described embodiments will be omitted or briefly described, and differences will be described.

In more detail, the secondary battery (20) according to the second embodiment of the present invention includes an electrode assembly (200) and a can (11) in which the electrode assembly (200) is accommodated. At this time, the secondary battery (20) according to the second embodiment of the present invention may further include an electrolyte accommodated inside the can (11).

The can (11) may be formed with a receiving portion (11a) that is opened upwardly to receive the electrode assembly (200). At this time, the can (11) may be formed in a cylindrical shape, for example. In addition, the can (11) may be formed of a metal material so that electricity may be conducted therethrough.

The top cap (13) can cover the opened receiving portion (11a) of the can (11).

The electrode laminate (110) can be formed in a wound form in which electrodes (113) and separators (114, 115) are alternately assembled.

The electrode (113) may include a first electrode (111) and a second electrode (112). In addition, the separator (114, 115) electrically insulates the first electrode (111) and the second electrode (112) by separating them.

The first electrode (111) may include a first electrode current collector (111a) and a first electrode active material (111b) coated on one surface of the first electrode current collector (111a).

The second electrode (112) may include a second electrode current collector (112a) and a second electrode active material (111b) coated on one surface of the second electrode current collector (112a).

The second electrode current collector (112a) may be made of a metal foil. At this time, the second electrode current collector (112a) may be made of, for example, a copper foil made of a copper (Cu) material.

The second electrode (112) may be positioned at the outermost surface of the electrode stack (110). At this time, the other surface of the second electrode current collector (112a) of the second electrode (112) may be positioned at the outermost surface of the electrode assembly (200).

Meanwhile, the first electrode (111) may be formed as an anode, and the second electrode (112) may be formed as a cathode.

The electrode tab (130) is attached to or extended from the electrode (113) and electrically connected to the electrode (113).

The electrode tab (130) may include a first electrode tab (131) extending from the first electrode (111) to one side in a direction parallel to the winding center axis (C) of the electrode laminate (110) and a second electrode tab (132) extending from the second electrode (112) to the other side.

When referring to FIG. 7, the first electrode tab (131) may be formed in the direction in which the top cap (13) is positioned in the upper direction, and the second electrode tab (132) may be positioned toward the bottom surface (11b) of the receiving portion (11a) of the can (11) in the lower direction.

In addition, the second electrode tab (132) can be in direct contact with the can (11). At this time, the end of the second electrode tab (132) can be fixed to the bottom surface (11b) of the receiving portion (11a) of the can (11).

Meanwhile, the first electrode tab (131) can be electrically connected to the top cap (13).

The sealing tape (140) can wrap the electrode laminate (110) to prevent unwinding.

In addition, the sealing tape (140) can wrap the first part of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the sealing tape (140) can wrap the upper and lower parts of the electrode laminate (110) in the direction of the winding center axis (C).

In addition, the sealing tape (140) may include a substrate film (141) and an adhesive layer (142) provided on one surface of the substrate film (141).

The conductive wire (220) is provided on the outer surface of the second electrode (112) and includes a conductive material.

Additionally, the conductive wire (220) can be wound along the outer surface of the second electrode (112).

In addition, the conductive wire (220) can wrap the second portion of the electrode laminate (110) in the direction of the winding center axis (C). At this time, the conductive wire (220) can wrap the central portion of the electrode laminate (110) in the direction of the winding center axis (C).

Additionally, the conductive wire (220) may include a copper material.

Meanwhile, the cross-section of the conductive wire (220) may be provided in a square shape. And, the thickness of the conductive wire (220) may be formed to be greater than the thickness (t) of the sealing tape (140).

And, the conductive wire (220) can have its inner side in contact with the electrode laminate (110) in the winding direction and its outer side joined to the can (11).

Although the present invention has been described in detail through specific examples, this is intended to specifically explain the present invention, and the present invention is not limited thereto. It will be said that various implementations are possible by those with ordinary knowledge in the relevant field within the technical idea of the present invention.

In addition, the specific scope of protection of the invention will be made clear by the appended claims.

10: Secondary battery
11: Can
11a: Reception area
11b: Bottom surface
13: Top cap
100,200: Electrode assembly
110: Electrode laminate
111: 1st electrode
111a: First electrode current collector
111b: First electrode active material
112: Second electrode
112a: Second electrode collector
112b: Second electrode active material
113: Electrode
114,115: Membrane
120,220: Conductive wire
121,221: One side
122,222: Other side
130: Electrode tab
131: 1st electrode tab
132: 2nd electrode tab
140: Sealing Tape
141: Film
142: Adhesive layer
C: Central axis
I: inner
O: Outside

Claims (17)

An electrode laminate in which a first electrode, a separator, and a second electrode are alternately laminated and wound, and the second electrode is positioned at the outermost layer; and
An electrode assembly comprising a conductive wire provided on the outer surface of the second electrode and including a conductive material. In claim 1,
An electrode assembly in which the conductive wire is wound along the outer surface of the second electrode. In claim 2,
It further includes a seal tape that wraps the electrode laminate to prevent the electrode laminate from being unwound,
An electrode assembly in which the sealing tape wraps a first portion of the electrode laminate with respect to the winding center axis, and the conductive wire wraps a second portion of the electrode laminate. In claim 3,
The above sealing tape wraps the upper and lower parts of the electrode laminate with respect to the winding center axis direction,
The above conductive wire is an electrode assembly that surrounds the central portion of the electrode laminate. In claim 4
An electrode assembly in which the conductive wire is fixed to the sealing tape, with both ends positioned at the upper and lower portions of the electrode laminate in the longitudinal direction. In claim 1,
The second electrode includes a second electrode current collector and a second electrode active material coated on one surface of the second electrode current collector,
The other surface of the second electrode current collector is located on the outermost surface of the electrode laminate,
An electrode assembly in which the second electrode current collector is provided with a metal foil. In claim 6
An electrode assembly in which the conductive wire is fixed on both sides in the longitudinal direction to the other surface of the second electrode collector. In claim 1,
The above conductive wire is an electrode assembly including a copper material. In claim 1
An electrode assembly in which the cross-section of the conductive wire is provided in a circular shape. In claim 9
An electrode assembly in which the diameter of the conductive wire is 50 um to 60 um. In claim 1
An electrode assembly in which the cross-section of the conductive wire is provided in a square shape. In claim 11
An electrode assembly in which the thickness and width of the conductive wire are 50 um to 60 um. In claim 1
The above conductive wire
An electrode assembly that wraps the above electrode laminate 1 to 10 times. In any one of claims 1 to 13,
An electrode assembly wherein the first electrode is formed as an anode and the second electrode is formed as a cathode. An electrode assembly as claimed in any one of claims 1 to 13; and
A secondary battery comprising a can accommodating the electrode assembly. In claim 15
The above conductive wire
A secondary battery in which the inner side is in contact with the electrode laminate with respect to the winding direction, and the outer side is joined to the can. In claim 15
The electrode assembly further includes a first electrode tab extending from the first electrode to one side in a direction parallel to the winding center axis of the electrode laminate, and a second electrode tab extending from the second electrode to the other side,
The above second electrode tab is a secondary battery in direct contact with the can.

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