KR20230128700A - Cylindrical secondary battery and current collector plate applied thereto, and battery pack and vehicle including the cylindrical secondary battery - Google Patents

Abstract

A current collector plate according to the present invention and a cylindrical secondary battery including the current collector plate have a first bent portion bent downward toward the winding hole of the electrode assembly around the current collector plate hole and contacting the inner circumferential surface of the winding hole, so that the core part of the electrode assembly is formed. Movement can be regulated.

Description

Cylindrical secondary battery and current collector plate applied thereto, and battery pack and vehicle including the cylindrical secondary battery}

The present invention relates to a cylindrical secondary battery, a current collector applied thereto, and a battery pack and automobile including the cylindrical secondary battery.

More specifically, a current collector plate having a structure capable of preventing the core portion of the electrode assembly from escaping from the electrode assembly core hole (winding hole) due to venting pressure, etc., a cylindrical battery cell including the same, and the cylindrical battery cell It relates to battery packs and automobiles that do.

Conventional cylindrical secondary batteries generally have a structure in which a tab connecting a jelly-roll type electrode assembly and an external terminal is welded to a foil of the electrode assembly. In the cylindrical secondary battery having such a structure, the current path is limited and the self-resistance of the electrode assembly is inevitably high.

Accordingly, a method of lowering the resistance by increasing the number of tabs connecting the jelly-roll type electrode assembly and the external terminal has been attempted, but just by increasing the number of tabs in this way, the resistance is lowered to a desired level and the current path is sufficiently Acquisition was limited.

Accordingly, it is necessary to develop a new jelly-roll type electrode assembly structure and a current collector structure suitable for this structure in order to reduce the self-resistance of the electrode assembly. In particular, the application of the electrode assembly and the current collector plate of this new structure is more necessary for devices that require a battery pack having high output/high capacity, such as, for example, an electric vehicle.

The current collector plate may be coupled to the inner surface of the battery can by being welded to the electrode assembly and at the same time having an end thereof bent.

1 is a view showing the structure of an electrode assembly 10 included in a cylindrical secondary battery, and FIG. 2 is a schematic view showing the structure of a (negative electrode) collector plate 30 coupled to the electrode assembly 10.

The electrode assembly 10 includes a first electrode E1 having a first polarity, a second electrode E2 having a second polarity, and a separator S interposed between the first electrode E1 and the second electrode E2. ) is wound in one direction to form a jelly roll. A cavity, that is, a winding hole H1 is naturally formed in the center of the jelly roll shape by winding. The first electrode E1 and the second electrode E2 have uncoated portions 11a and 12a at both ends and a holding portion 11b coated with an active material layer except for the uncoated portions 11a and 12a. , 12b). The non-coated portion becomes the first and second electrode tabs 11 and 12 to be described later, and may be respectively coupled to current collector plates having corresponding polarities.

In this case, the collector plate 30 coupled to the electrode assembly 10 also has a collector plate hole H2 at a position corresponding to the winding hole H1. The collector plate hole H2 communicates with the winding hole H1, and electrolyte is injected through these holes and welding between other parts is performed. That is, the winding hole H1 and the current collecting plate hole H2 are essential components for forming a space for improving liquid injectability and welding parts.

On the other hand, the upper part of the electrode assembly 10 is coupled to the current collector plate and regulated, but the electrode assembly core portion C around the winding hole H1 is not regulated because the upper portion of the electrode assembly 10 is drilled into the space of the current collector hole H2 thereon. state is not For this reason, when the gas venting pressure inside the secondary battery is directed toward the collector plate 30, there is a risk that the electrode assembly core portion C may come out through the collector plate hole H2. In this case, the structure of the electrode assembly is damaged, thereby destroying a stable electrical connection with the current collector plate and causing a short circuit.

Therefore, it is desired to develop a cylindrical secondary battery having a structure capable of preventing the core of the electrode assembly from coming out through the collector plate hole and a collector plate structure applied to the cylindrical secondary battery.

Republic of Korea Patent Publication No. 10-2020-0041625

The present invention has been made in consideration of the above problems, and one object is to provide a current collector plate having a structure capable of preventing movement of the core part by regulating the core part of an electrode assembly, and a cylindrical secondary battery including the same. .

In addition, another object of the present invention is to provide a current collector plate having a structure capable of preventing deformation or damage of a welded portion with an electrode assembly and/or a welded portion with a battery can, and a cylindrical secondary battery including the same. .

A cylindrical secondary battery according to an embodiment of the present invention for solving the above problems is composed of a jelly roll shape by winding a first electrode and a second electrode and a separator interposed therebetween in one direction, and the jelly roll shape An electrode assembly having a winding hole formed in the center of the; a battery can accommodating the electrode assembly through an opening formed at one side and electrically connected to the first electrode; a current collector plate coupled to a first electrode tab provided in the first electrode and a battery can, respectively; a cap plate covering the opening of the battery can; and a cell terminal electrically connected to a second electrode tab provided on the second electrode through the battery can at the opposite side of the opening, wherein the current collector plate is formed at a position corresponding to the winding hole. and a first bent portion formed around the current collector hole to be inserted into the winding hole and restrict movement of the electrode assembly core around the winding hole.

As an example, the first bent portion may be bent downward toward the winding hole of the electrode assembly to be adjacent to or contact an inner circumferential surface of the winding hole.

The first bent part may continuously or discontinuously extend along the circumference of the current collector hole.

A length of the first bent portion may be the same as or different from a length of the first electrode tab.

As an example, the current collector plate may include a central portion having the current collector plate hole and a first bent portion, and a plurality of tab coupling portions radially extending from the central portion and spaced apart from each other and coupled to the first electrode tab. there is.

As a specific example, the longitudinal end of the tab coupling portion may be upwardly bent in a direction opposite to that of the first electrode tab and coupled to the inner surface of the battery can.

As another example, second bent parts upwardly bent in a direction opposite to the first electrode tab may be formed at both sides of the tab coupling part in the width direction.

In addition, a third bent portion that is bent outwardly or inwardly parallel to the width direction of the tab coupling portion may be formed from the second bent portion.

As one example, the current collector plate may further include a plurality of first can-coupled portions extending from the central portion between the plurality of tab-coupled portions and coupled to an inner surface of the battery can.

Specifically, the first can coupling portion may include a first contact portion coupled to an inner surface of the battery can; and a first connection part connecting between the central part and the contact part.

In addition, at least a portion of the first contact portion may extend along the inner circumferential surface of the battery can.

The first connection part may include at least one first bending part whose extension direction is changed.

As an example, the current collector plate further includes a second can-coupled portion extending from an end of the tab-coupled portion and coupled to an inner surface of the battery can, and the second can-coupled portion of the battery can. A second contact portion coupled on the inner surface; and a second connection portion connecting the central portion and the contact portion.

A current collector according to an embodiment of the present invention for solving the above problems is a current collector that electrically connects between an electrode assembly applied to a cylindrical secondary battery and a battery can, and the current collector has a current collector hole. A first bent portion including a central portion and a plurality of tab coupling portions radially extending from the central portion and being spaced apart from each other and coupled to the first electrode tab, and extending along a circumference of the current collector hole and bent downward, is formed in the central portion. characterized by

Meanwhile, a battery pack according to an embodiment of the present invention includes a plurality of cylindrical secondary batteries according to an embodiment of the present invention described above.

A vehicle according to an embodiment of the present invention includes the battery pack according to the above-described embodiment of the present invention.

According to the present invention, it is possible to stably maintain the electrical connection structure between the current collector plate and the electrode assembly by regulating the movement of the core portion around the winding hole of the electrode assembly.

In addition, according to the present invention, even if vibration and shock are applied during the use of the cylindrical secondary battery, the possibility of deformation and damage of the welded portion between the current collector plate and the electrode assembly and/or the welded portion between the current collector plate and the battery can can be greatly reduced.

In addition, according to the present invention, in manufacturing a cylindrical secondary battery, the convenience of a welding process for electrically connecting the battery can and the current collector plate can be increased, thereby improving productivity.

However, the effects obtainable through the present invention are not limited to the above-mentioned effects, and other technical effects not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical idea of the present invention, the present invention is the details described in such drawings should not be construed as limited to
1 is a view showing the structure of an electrode assembly included in a cylindrical secondary battery.
2 is a schematic diagram showing the structure of a (cathode) current collector coupled to the electrode assembly.
3 is a cross-sectional view showing the internal structure of a cylindrical secondary battery according to an embodiment of the present invention.
4 is an enlarged view of the internal structure of the cylindrical secondary battery of FIG. 3 and an enlarged view of the internal structure of the cylindrical secondary battery of another embodiment.
5 is a diagram illustrating a current collector plate according to an exemplary embodiment of the present invention.
6 is a view showing a current collector plate according to another embodiment of the present invention.
7 to 9 are views illustrating a current collector plate according to still another embodiment of the present invention.
10 is a cross-sectional view showing the internal structure of a cylindrical secondary battery according to another embodiment of the present invention.
11 to 16 are views illustrating current collectors according to various embodiments of the present invention.
17 is a cross-sectional view illustrating the internal structure of a cylindrical secondary battery when an end of an electrode tab is formed in a bent shape parallel to a tab coupling portion of a current collector plate.
18 is a diagram illustrating a battery pack according to an embodiment of the present invention.
19 is a view showing a vehicle according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only some of the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, so various alternatives can be made at the time of this application. It should be understood that there may be equivalents and variations.

First, referring to FIG. 3 , a cylindrical secondary battery 1 according to an embodiment of the present invention includes an electrode assembly 10, a battery can 20, a current collector plate (a first collector plate) 30, a cap plate ( 40) and a cell terminal 50. The cylindrical secondary battery 1 may further include a sealing gasket G1 and/or an insulating gasket G2 and/or a current collector plate (second collector plate) P and/or an insulator I. there is.

As described with reference to FIG. 1, the electrode assembly 10 includes a first electrode E1, a second electrode E2, and a separator interposed between the first electrode E1 and the second electrode E2. (S) is wound in one direction to form a jelly roll. A winding hole is formed in the center of the electrode assembly. In this case, an additional separator (S) may be provided on the outer circumferential surface of the electrode assembly 10 for insulation from the battery can 20 .

The first electrode E1 and the second electrode E2 include a first electrode tab 11 and a second electrode tab 12 , respectively.

The first electrode E1 includes a first electrode active material coated on one or both surfaces of the first electrode current collector. At one end of the electrode current collector 10 in the width direction (a direction parallel to the height direction of the cylindrical secondary battery 1 shown in FIG. 3 ), there is a non-coated portion to which the first electrode active material is not coated. The uncoated portion functions as the first electrode tab 11 . The first electrode tab 11 is provided above the electrode assembly 10 accommodated in the battery can 20 in the height direction (a direction parallel to the height direction of the cylindrical secondary battery 1 shown in FIG. 3). The first electrode tab 11 may be, for example, a negative electrode tab.

The second electrode includes a second electrode active material coated on one or both surfaces of the second electrode current collector. At the other end of the second electrode current collector in the width direction (a direction parallel to the height direction of the cylindrical secondary battery 1 shown in FIG. 2 ), there is a non-coated portion to which the second electrode active material is not applied. The uncoated portion functions as the second electrode tab 12 . The second electrode tab 12 is provided below the electrode assembly 10 accommodated in the battery can 20 in the height direction. The second electrode tab 12 may be, for example, a positive electrode tab.

In the present invention, the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate may be used without limitation as long as they are known in the art.

In one example, the cathode active material has the general formula A[A _x M _y ]O _2+z (A includes at least one element of Li, Na, and K; M is Ni, Co, Mn, Ca, Mg, Al, including at least one element selected from Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; x ≥ 0, 1 ≤ x+y ≤ 2, 0.1 ≤ z ≤ 2; the stoichiometric coefficients of the components included in x, y, z and M are selected such that the compound remains electrically neutral).

Preferably, the cathode active material may include primary particles and/or secondary particles in which the primary particles are aggregated.

In one example, the negative electrode active material may use a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, or the like. Metal oxides such as TiO ₂ and SnO ₂ having a potential of less than 2 V can also be used as an anode active material. As the carbon material, both low crystalline carbon and high crystalline carbon may be used.

The separator is a porous polymer film, for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer. Alternatively, they may be laminated and used. As another example, the separator may use a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, or the like.

At least one surface of the separator may include a coating layer of inorganic particles.

It is also possible that the separation membrane itself is made of a coating layer of inorganic particles. Particles constituting the coating layer may have a structure combined with a binder so that an interstitial volume exists between adjacent particles.

The electrolyte may be a salt having a structure such as A ⁺ B ^-- . Here, A ⁺ includes alkali metal cations such as Li ⁺ , Na ⁺ , and K ⁺ or ions made of combinations thereof. And ^B- is _F- ^{, Cl- ,} _Br- ^, I- ^, NO _3- , N(CN) _2- , BF ^4- , ClO ^{4- ,} AlO _4- ^, AlCl ₄ ^-- , PF ₆ ^-- , SbF ₆ ^-- , AsF ₆ ^-- , BF ₂ C ₂ O ₄ ^-- , BC ₄ O ₈ ^-- , (CF ₃ ) ₂ PF ₄ ^-- , (CF ₃ ) ₃ PF ₃ ^- , (CF ₃ ) ₄ PF ₂ ^-- , (CF ₃ ) ₅ PF ^-- , (CF ₃ ) ₆ P ^-- , CF ₃ SO ₃ ^-- , C ₄ F ₉ SO ₃ ^-- , CF ₃ CF ₂ SO ₃ ^-- , (CF ₃ SO ₂ ) ₂ N ^-- , (FSO ₂ ) ₂ N _-- , CF ₃ CF ₂ (CF ₃ ) ₂ CO ^-- , (CF ₃ SO ₂ ) ₂ CH ^-- , (SF ₅ ) ₃ C ^-- , (CF ₃ SO ₂ ) ₃ C ^-- , CF ₃ (CF ₂ ) ₇ SO ₃ ^-- , CF ₃ CO ₂ ^-- , CH ₃ CO ₂ ^- ,SCN-- and (CF ₃ CF ₂ SO ₂ ) ₂ N ^-- includes one or more anions selected from the group consisting of;

The electrolyte can also be used by dissolving it in an organic solvent.

The battery can 20 is a substantially cylindrical container having an open portion formed on one side thereof, and is made of a conductive metal material. It is common that the side surface of the battery can 20 and the lower surface (lower surface with reference to FIG. 3) located on the opposite side of the opening are integrally formed. That is, the battery can 20 generally has an open upper end and a closed lower end in the height direction. The lower surface of the battery can 20 may have a substantially flat shape. The battery can 20 accommodates the electrode assembly 10 through an opening formed on one side in the height direction. The battery can 20 may also accommodate an electrolyte through the opening.

The battery can 20 may include a beading portion 21 formed at an upper end thereof. The battery can 20 may further include a crimping portion 22 formed on the beading portion 21 . The beading part 21 has a shape in which the circumference of the outer circumferential surface of the battery can 20 is press-fitted to a predetermined depth. The beading part 21 is formed on the upper part of the electrode assembly 10 .

The beading part 21 provides a support surface on which the cap plate 40 can be seated. In addition, the beading part 21 may provide a support surface on which at least a part of the edge circumference of the current collector plate 30, which will be described later, can be seated and coupled. That is, at least a part of the periphery of the current collector plate 30 and/or the periphery of the cap plate 40 of the present invention may be seated on the upper surface of the beading part 21 . The pressing depth and shape of the beading part 21 may be variously modified as needed. It is also possible that the beading portion 21 is omitted and at least a part of the edge circumference of the current collector plate 30 is directly attached to the flat sidewall of the battery can 20 .

The crimping part 22 is formed on the upper part of the beading part 21 . The crimping part 22 has a shape extended and bent to surround the periphery of the cap plate 40 disposed above the beading part 21 . Due to the shape of the crimping portion 22 , the cap plate 40 is fixed on the beading portion 21 . Of course, it is also possible to omit the crimping portion 22 and fix the cap plate 40 while covering the open portion of the battery can 20 through another fixing structure.

Next, referring to FIGS. 3 to 6 , the current collector (first collector plate) 30 according to an embodiment of the present invention will be described in detail.

First, referring to FIGS. 3 to 5 , the current collector 30 according to an embodiment of the present invention is accommodated inside the battery can 20 and electrically connected to the electrode assembly 10, and also the battery can. (20) and electrically connected. That is, the current collector plate 30 electrically connects the electrode assembly 10 and the battery can 20 .

The current collector plate 30 according to an embodiment of the present invention includes a central portion 31 and a plurality of tab coupling portions that radially extend from the central portion 31 and are spaced apart from each other and coupled to the first electrode tab 11. (32) may be included.

The central portion 31 and the plurality of tab coupling portions 32 are disposed above the electrode assembly 10 and are lower than the beading portion 21 when the beading portion 21 is formed in the battery can 20. located in

The central part 31 includes a current collecting plate hole H2 formed at a position corresponding to the winding hole H1 formed in the central part of the electrode assembly 10 . The winding hole H1 and the current collector hole H2 communicating with each other are welded between the cell terminal 50 and the current collector plate (second collector plate) (P) or a cell terminal 50 and a lead tab (not shown). ) can function as a passage for insertion of a welding rod for welding between the cells or laser irradiation.

The plurality of tab coupling parts 32 may have a shape extending substantially radially from the center 31 of the current collector plate 30 toward the sidewall of the battery can 20 . Each of the plurality of tap coupling parts 32 may be spaced apart from each other along the circumference of the central portion 31 . On the other hand, in order to secure bonding strength and reduce electrical resistance by increasing the bonding area between the current collector plate 30 and the electrode assembly 10, the center portion 31 as well as the tab coupling part 32 is also the first electrode tab 11 can also be combined with

The current collector plate 30 of the present invention, Characterized in that a first bent portion is formed around the current collector hole (H2) to be inserted into the winding hole (H1) of the electrode assembly to regulate the movement of the core part (C) of the electrode assembly around the winding hole (H1) do.

As shown in FIG. 3, since the winding hole H1 in the center of the electrode assembly and the current collector hole H2 of the current collector plate communicate with each other, when gas is generated in the battery and the gas pressure is generated, the communication space Through this, the circumferential portion (core portion C) of the electrode assembly winding hole H1 may come out. That is, since the electrode assembly is simply wound and the center (winding hole H1) is empty, there is a risk that the core portion C is released upward through the winding hole H1 and the collector plate hole. . The stronger the gas pressure, the greater this risk. When the core part (C) is released, the jelly roll shape of the electrode assembly is partially collapsed, and thus, the bonding force between the current collector plate and the electrode assembly may be weakened. In this case, an electrical connection between the first collector plate and the electrode assembly is disconnected, and a short circuit may occur. In order to prevent this, the present invention forms a limiting portion for regulating the movement of the core portion C around the current collector hole H2 formed at a position corresponding to the winding hole H1.

Specifically, the regulating portion inserted into the winding hole H1 is a first bent portion 31a bent downward toward the winding hole of the electrode assembly. In order to regulate the movement of the core part, the first bent part 31a may be adjacent to (see FIG. 4(b)) or contact (see FIGS. 3 and 4(a)) the inner circumferential surface of the winding hole. When the first electrode tab 11 of the electrode assembly is coupled to the current collector plate 30 by, for example, welding, the first bent portion contacts the inner circumferential surface of the winding hole as shown in FIG. 3 or is adjacent to it as shown in FIG. 4(b). By being positioned in such a way, the upward movement of the electrode assembly core portion (C) is restricted.

As shown in Fig. 4(a), when the first bent portion 31a closely contacts the inner circumferential surface of the winding hole H1, the movement of the core portion can be reliably restricted. Meanwhile, in the case of the embodiment in which the first bent portion 31a is positioned adjacent to the inner circumferential surface of the winding hole H1 as shown in FIG. 4(b), future swelling of the electrode assembly is considered. That is, since the first bent portion 31a is located adjacent to the inner circumferential surface of the winding hole H1 even in the embodiment of FIG. When the assembly swells, the first bent portion 31a may come into contact with the inner circumferential surface of the winding hole. Accordingly, the embodiment of FIG. 4(b) may be referred to as an embodiment related to a regulator considering swelling of a secondary battery.

The shape of the first bent portion 31a may be continuously extended along the circumference of the current collector hole H2 (see FIG. 5), but may also be discontinuously extended (see FIG. 6). ). The shape to be taken can be appropriately determined in consideration of the shaping operation of the current collector plate or the ease of the bending operation of the first bent portion 31a, or the effect of regulating the core portion C. For example, since the first bent part 31a of FIG. 6 consists of a plurality of bent parts spaced apart from each other, it is relatively easy to bend it downward. However, since the bent parts are spaced apart, a part of the core part C of the electrode assembly may protrude through the spaced gap, so the shape of FIG. 5 may be preferred in terms of the core part regulation effect.

The length of the first bent portion 31a may be determined within an appropriate range in consideration of the effect of regulating the core portion. For example, when the first electrode tab 11 has a range of 2 to 10 mm, the first bent portion 31a may be determined in a range of 0.5 to 7 mm. If the length of the first bent part 31a is too short, the effect of regulating the core part may be weakened, and if the length of the first bent part 31a is too long, forming and bending operations may become difficult and a coupling operation with the electrode assembly 10 may become cumbersome. there is. Accordingly, the length of the first bent portion 31a may be equal to or different from that of the first electrode tab 11 within a range where the core portion regulation can be efficiently achieved. Preferably, if the length of the first electrode tab 11 is the same, the first bent portion 31a may stably regulate the electrode assembly 10 . In one embodiment, the appropriate length of the first bent portion 31a may be determined in the range of 1 to 3 mm.

Referring to FIGS. 7 to 9 , second bent portions 32a bent upward in a direction opposite to the first electrode tab 11 are formed at both sides of the tab coupling portion 32 in the width direction. In this way, when the second bent portion 32a is formed on both sides of the tab coupling portion 32, the structural rigidity of the tab coupling portion increases. That is, the tab coupling portion 32 having the second bent portion 32a has bending rigidity, so that bending deformation is difficult to occur. Therefore, even when bending stress is applied to the current collector plate during the welding operation between the current collector plate 30 and the electrode assembly 10, the bending of the tab coupling portion 32 of the current collector plate can be prevented. Alternatively, even if external shock and vibration are repeatedly applied to the secondary battery during use after completion of the secondary battery, bending of the tab coupling part 32 can be prevented. Accordingly, since the welding joint between the current collector plate 30 and the electrode assembly 10 is not deformed and the welding connection is stably maintained, the electrical connection between the current collector plate and the electrode assembly can also be stably maintained.

As shown in FIG. 3 , the plurality of tab coupling parts 32 may be coupled to, for example, the beading part 21 of the inner surface of the battery can 20 . The tap coupling parts 32 may be particularly coupled to the upper surface of the beading part 21 . In the cylindrical secondary battery 1 of the present invention, when this structure is applied, the tab coupling part ( 32) can be naturally seated on the beading part 21. Therefore, a welding process between the battery can 20 and the current collector 30 can be easily performed. The longitudinal end 32-1 of the tab coupling part 32 is bent upward in a direction opposite to the first electrode tab 11, and is placed on the beading part 21 of the inner surface of the battery can 10. are combined

In this case, in the tap coupling portion 32, only both sides of the tap coupling portion 32 in the width direction excluding the portion of the longitudinal end portion 32-1 that is bent upward to be coupled to the beading portion 21. It is preferable to form the second bent portion 32a. This is because when the second bent portion 32a is formed up to the longitudinal end portion 32-1, the bending rigidity of the portion increases, making it difficult to perform an upward bending operation for coupling the beading portion.

Forming the first bent portion 31a around the current collector hole and forming the second bent portion 32a on both sides in the width direction may be performed by mechanically bending the corresponding portion or by injection molding or It can be achieved by other molding methods.

As shown in FIG. 7 , the second bent portion 32a may be continuously formed on both sides along the longitudinal direction of the tab coupling portion 32 . However, it is not limited thereto, and it is also possible to form a gap along both sides of the tab coupling part, that is, discontinuously. In addition, the height of the second bent portion 32a may be constant, or a form in which the height may vary along the longitudinal direction of the tap coupling portion 32 is also possible.

The height of the second bent portion 32a may be determined to the extent that it does not come into contact with the inner surface of the battery can 20 or come into contact with other parts that may be installed in the battery can 20 . As one embodiment, when the thickness of the current collector 30 is 0.3t (0.3mm), the height of the second bent portion 32a may be 1mm or less.

As such, the current collector plate 30 having enhanced bending rigidity by forming the first bent portion 31a around the current collector hole H2 or having the second bent portion 32a, as shown in FIG. (30) has a special technical meaning when a space is formed on it. That is, as shown in FIG. 3 , when the longitudinal end portion 32-1 of the current collector plate 30 is bent upward for coupling with the beading portion 21, the tab coupling portion 32 welded to the electrode assembly 10 A space is inevitably formed on the upper surface of, and in this case, the core part (C) of the electrode assembly can come out into this space. Alternatively, there is a high possibility that a bending phenomenon may occur in the tab coupling part 32 .

Therefore, in the cylindrical secondary battery having this type of internal structure, the technical significance of regulating the core portion by the first bent portion 31a and preventing deformation of the welded portion by the second bent portion is greater.

8 and 9 are views showing modified examples of the second bent portion.

8 is an example in which, in addition to the second bent portion 32a, a third bent portion 32b bent outward from the second bent portion 32a in parallel with the width direction of the tap coupling portion 32 is formed. am.

9 is an example in which a third bent portion 32b' bent inwardly parallel to the width direction of the tap coupling portion is formed in addition to the second bent portion 32a.

In this way, when the third bent portions 32b and 32b' are additionally formed, there is an advantage in that the bending rigidity of the tab coupling portion 32 is further strengthened.

10 is a cross-sectional view showing the internal structure of a cylindrical secondary battery according to another embodiment of the present invention, and FIGS. 11 to 13 are views showing current collector plates according to various embodiments of the present invention.

The cylindrical secondary battery of FIG. 10 includes the current collector plate shown in FIG. 11 .

The current collector plate 30 of the embodiment of FIGS. 11 to 13 extends from the center 31 in addition to a plurality of tab coupling portions 32 extending from the center 31 and coupled to the first electrode tab 11, It includes a plurality of first can coupling parts 33 coupled to the inner surface of the battery can 20 . The tap coupling portion 32 and the first can coupling portion 33 are indirectly connected through the central portion 31 and are not directly connected to each other. Therefore, when an external impact is applied to the cylindrical secondary battery 1 of the present invention, the joint between the current collector 30 and the electrode assembly 10 and the joint between the current collector 30 and the battery can 20 are damaged. possibility of occurrence can be minimized.

The central portion 31 and the plurality of tab coupling portions 32 are disposed above the electrode assembly 10 and are lower than the beading portion 21 when the beading portion 21 is formed in the battery can 20. located in

3 to 9, the longitudinal end 32-1 of the tab coupling part 32 is coupled to the inner surface of the battery can 20, but in this embodiment, the current collector 30 The tab coupling portion 32 of is coupled to the first electrode tab 11 , and the first can coupling portion 33 is coupled to the inner surface of the battery can 20 . Therefore, since the tap coupling part 32 of the present embodiment is not in a form in which the longitudinal end is bent upward, the tab coupling part 32 is upwardly bent on both sides in the width direction to the end along the entire length direction of the tap coupling part 32. Two bent parts 32a can be formed (see Fig. 12).

Meanwhile, the plurality of first can coupling parts 33 may have a shape extending substantially radially from the center 31 of the current collector plate 30 toward the sidewall of the battery can 20 . Each of the plurality of first can coupling parts 33 may be spaced apart from each other along the circumference of the central portion 31 . At least one first can coupling unit 33 may be positioned between the adjacent tab coupling units 32 . The plurality of first can coupling parts 33 may be coupled to, for example, the beading part 21 of the inner surface of the battery can 20 . The first can coupling parts 33 may be particularly coupled to the upper surface of the beading part 21 . In the cylindrical secondary battery 1 of the present invention, when this structure is applied, the first can is coupled through a process of accommodating the electrode assembly 10 in a state in which the current collector plate 30 is coupled into the battery can 20 The part 33 can be naturally seated on the beading part 21 . Therefore, a welding process between the battery can 20 and the current collector 30 can be easily performed. In addition, the upper surface of the beading part 21 has a form extending along a direction substantially parallel to the lower surface of the battery can 20, that is, a direction substantially perpendicular to the sidewall of the battery can 20, and the first can coupling part 33 ) It is also possible to stably contact the first can coupling part 33 on the beading part 21 by having an extended form along the same direction. In addition, as the first can coupling part 33 stably contacts the beading part 21, welding between the two parts can be smoothly performed, thereby improving the bonding force between the two parts and minimizing the increase in resistance at the bonding site. can be obtained.

In the cylindrical secondary battery 1 of FIG. 10 , the first bent portion 31a is in contact with the inner circumferential surface of the winding hole H1, but as shown in FIG. A form adjacent to each other at intervals is also possible.

Next, referring to FIGS. 10 to 13, the first can coupling part 33 is coupled to the inner surface of the battery can 20, the first contact part 33a and the central part 31 and the first contact part ( 33a) includes a first connection portion 33b connecting between them.

The first contact portion 33a is coupled to the inner surface of the battery can 20 . In the case where the beading part 21 is formed on the battery can 20, the first contact part 33a may be coupled to the beading part 21 as described above. In this case, as described above, for stable contact and coupling, both the beading part 21 and the first contact part 33a are directed substantially parallel to the lower surface of the battery can 20, that is, approximately to the sidewall of the battery can 20. It may have an elongated shape along a vertical direction.

The first connection portion 33b may include at least one first bending portion B1 whose extension direction is switched between the central portion 31 and the first contact portion 33a. That is, the first connection portion 33b may have a spring-like structure or a bellows-like structure capable of contraction and extension within a certain range, for example. The structure of the first connection part 33b is a process of accommodating the electrode assembly 10 to which the current collector plate 30 is coupled into the battery can 20 even if the height distribution of the electrode assembly 10 exists within a certain range. The first contact portion 33a is brought into close contact with the beading portion 21.

In addition, even if the electrode assembly 10 moves up and down due to vibration and/or impact occurring during the use of the cylindrical secondary battery 1, the structure capable of contraction and extension of the first connection portion 33b maintains the electrode within a certain range. The shock caused by the movement of the assembly 10 is alleviated. That is, the structure capable of contraction and extension of the first connection portion 33b is a coupling portion between the first contact portion 33a and the battery can 20 and a coupling portion between the tab coupling portion 32 and the first electrode tab 11. It can act as a shock absorber so that shock is not transmitted to it.

Meanwhile, the cylindrical secondary battery of the embodiment of FIG. 10 is different from the cylindrical secondary battery shown in FIG. 3 in the shape of the beading portion 21 and the crimping portion 22 in addition to the shape of the current collector plate 30 .

That is, in the present embodiment, in order to more stably support at least a part of the edge circumference of the current collector plate 30 and/or the edge circumference of the can cover 40, the upper surface of the beading part 21 is formed on the battery can ( 20) along a direction substantially parallel to the lower surface, and has a long elongated form. Accordingly, the pressing depth of the beading portion 21 is also larger than that of the secondary battery of FIG. 3 . Also, in this embodiment, the inner diameter of the battery can 20 in the region where the beading part 21 is formed is smaller than the diameter of the electrode assembly 10 .

Next, referring to FIG. 13 , at least a portion of the first contact portion 33a may extend along the inner circumferential surface of the battery can 20 . In this case, in order to maximize the contact area, the current collector plate 30 has the inner circumference of the battery can 20, the sum of the lengths of the first contact portions 33a of each of the plurality of first can coupling portions 33. It may be configured to be approximately the same as

Next, referring to FIG. 14 , a current collecting plate 30 according to another embodiment of the present invention is shown. The current collector plate 30 according to another embodiment of the present invention is different from the current collector plates 30 according to the previous embodiments in that the second can coupler 34 is further provided.

The second can coupling portion 34 extends from the end of the tab coupling portion 32 and is coupled to the inner surface of the battery can 20 . The second can coupling portion 34 is provided at an end of at least one of the plurality of tab coupling portions 32 . The second can coupling portion 34 includes a second contact portion 34a coupled to the inner surface of the battery can 20 and a second connection portion 34b connecting between the central portion 31 and the second contact portion 34a. includes

The second contact portion 34a is coupled to the inner surface of the battery can 20 . In the case where the beading part 21 is formed on the battery can 20, the second contact part 34a may be coupled to the beading part 21 like the above-described first contact part 33a. In this case, as described above, for stable contact and coupling, both the beading portion 21 and the second contact portion 34a are directed in a direction substantially parallel to the lower surface of the battery can 20, that is, on the sidewall of the battery can 20. It may have an elongated shape along a substantially vertical direction.

Meanwhile, like the shape of the first contact portion 33a shown in FIG. 13 , at least a portion of the second contact portion 34a may also have a shape extending along the inner circumferential surface of the battery can 20 . In this case, in order to maximize the contact area between the current collector plate 30 and the battery can 20, the current collector plate 30 has an extended portion of the second contact portion 34a of each of the plurality of second can coupling portions 34. The sum of the lengths may be configured to be substantially equal to the inner circumference of the battery can 20 .

Like the first connection portion 33b described above, the second connection portion 34b includes at least the second bending portion B2 whose extension direction is switched between the tap coupling portion 32 and the second contact portion 34a. one can be provided. Due to the formation of the second bending portion B2, the second connection portion 34b has a structure capable of contraction and extension, and thus has an advantage in the assembly process of the cylindrical secondary battery 1 and a buffering effect. Same as described.

In the drawings of the present invention, only one second bending part B1 is shown, but the present invention is not limited thereto, and like the first connection part 33b, the second bending part B2 also A plurality may be provided.

Referring to FIGS. 3 and 10 , the cap plate 40 covers the opening formed on one side of the battery can 20 . The cap plate 40 may be fixed by a crimping part 22 formed on the top of the battery can 20 . In this case, a sealing gasket G1 is interposed between the battery can 20 and the cap plate 40 and between the current collector 30 and the cap plate 40 to improve fixing force and airtightness of the battery can 20. It could be. However, in the present invention, the cap plate 40 is not a part that should function as a passage of current. Therefore, if it is possible to firmly fix the battery can 20 and the cap plate 40 through welding or fixation according to the application of other parts and to secure the airtightness of the opening of the battery can 20, the sealing gasket G1 Application is not essential.

When the sealing gasket G1 is applied, the extended length of the portion interposed between the current collector 30 and the cap plate 40 of the sealing gasket G1 is interposed between the battery can 20 and the cap plate 40. Compared to the extended length of the part, it can be formed shorter. In particular, in the cylindrical secondary battery of FIG. 8, when the sealing gasket G1 extends too long in a direction toward the center of the cylindrical secondary battery 1 inside the battery can 20, the sealing gasket G1 and Deformation of the current collector plate 30 may occur due to interference between the current collector plates 30, and as a result, a welded portion between the current collector plate 30 and the battery can 20 and/or the current collector plate 30 and the electrode tab 11 may be deformed. ) may cause defects due to force being applied to the welded part between them. Therefore, by partially controlling the extension length of the sealing gasket G1 as described above, it is possible to prevent such defects from occurring.

Meanwhile, the cap plate 40 may include a venting portion 41 formed to prevent an increase in internal pressure due to gas generated inside the battery can 20 . The venting portion 41 is formed on a part of the cap plate 40 and corresponds to an area structurally weaker than the surrounding area so that it can be easily broken when internal pressure is applied. The venting part 41 may be, for example, a region having a smaller thickness compared to the surrounding region.

The cell terminal 50 is electrically connected to the second electrode tab 12 of the electrode assembly 10 through the battery can 20 on the opposite side of the open portion of the battery can 20 . The cell terminal 50 may pass through a substantially central portion of the lower surface of the battery can 20 . The cell terminal 50 is, for example, coupled to a current collector (second collector plate) P coupled to the second electrode tab 12 or a lead tab coupled to the second electrode tab 12 (not shown). ), it can be electrically connected to the electrode assembly 10. Accordingly, the cell terminal 50 has the same polarity as the second electrode of the electrode assembly 10 and can function as the second electrode terminal T2. When the second electrode tab 12 is a positive electrode tab, the cell terminal 50 may function as a positive electrode terminal.

Considering the polarity and function of the cell terminal 50, the cell terminal 50 must maintain an insulation state from the battery can 20 having the opposite polarity. To this end, an insulating gasket G2 may be applied between the cell terminal 50 and the battery can 20 . Alternatively, insulation may be realized by coating a portion of the surface of the cell terminal 50 with an insulating material.

For the same reason, the second electrode tab 12 and/or the current collector (second collector plate) P must be insulated from the battery can 20 . To this end, an insulator I may be interposed between the second electrode tab 12 and the battery can 20 and/or between the current collecting plate (second current collecting plate) P and the battery can 20 . When the insulator I is applied, the cell terminal 50 may pass through the insulator I for electrical connection with the second electrode tab 12 .

Meanwhile, in the present invention, the entire surface of the battery can 20 may function as the first electrode terminal T1. When the first electrode tab 11 is a negative electrode tab, the first electrode terminal T1 may be a negative electrode terminal. In the cylindrical secondary battery 1 according to the present invention, the cell terminal 50 exposed on the lower surface opposite the opening of the battery can 20 and the cell terminal 50 of the lower surface of the battery can 20 It has a structure in which the remaining areas except for the area occupied by are used as the second electrode terminal T2 and the first electrode terminal T1, respectively. Therefore, in the cylindrical secondary battery 1 according to the present invention, both positive and negative electrodes can be connected in one direction when electrically connecting the plurality of cylindrical secondary batteries 1, thereby simplifying the electrical connection structure. In addition, since the cylindrical secondary battery 1 according to the present invention has a structure in which most of the lower surface located on the opposite side of the open portion of the battery can 20 can be used as an electrode terminal, parts for electrical connection can be welded. It has the advantage of securing a sufficient area.

15 and 16, the current collector plate (first collector plate) 30 of the present invention includes an injection hole extension plate 36 having at least one injection hole H3 at the tap coupling part 32. It can be provided on one side or both sides. In this case, the tap coupling part 32 includes an injection hole extension plate 36 extending outward from one side or both sides in the width direction thereof. As in the above-described embodiment, the second bent portion 32a may be formed by protruding (or bending) upward from both sides in the width direction (see FIG. 16 ).

In the case where a plurality of tap coupling parts 32 are provided, the injection hole H3 may be provided in at least one tap coupling part 32 . The injection hole extension plate 36 and the injection hole H3 may be provided on one side or both sides of at least one welding line W formed on the tap coupling part 32, for example. can In manufacturing the cylindrical secondary battery 1 according to an embodiment of the present invention, after accommodating the assembly including the electrode assembly 10 and the current collector plate (first collector plate) 30 in the battery can 20, Electrolyte can be injected. At this time, liquid injection may be improved due to the liquid injection hole H3.

Meanwhile, although the second bent portion 32a shown in FIG. 7 is not formed in the tab coupling part 32 provided in the collector plate 30 of the embodiments of FIGS. 13 and 14, the collector plate of these embodiments also Of course, it is possible to prevent deformation of the welded portion by forming the second bent portion 32a.

In addition, it is shown that only the second bent portion 32a is formed in the tab coupling portion 32 provided in the current collector plate 30 of the embodiments of FIGS. 12 and 16 . However, as shown in FIGS. 8 and 9 for the tap coupling portions 32 of the above embodiments and the tab coupling portions of other embodiments, in addition to the second bent portion 32a, the third bent portion 32b, It goes without saying that a variant in which 32b') is additionally formed is also possible.

As described above, the current collector plates of the present invention are bent downward toward the winding hole H1 of the electrode assembly around the collector plate hole H2, and the first bent portion 31a is adjacent to or in contact with the inner circumferential surface of the winding hole H1. ) is provided.

Therefore, according to the present invention, the first bent portion 31a regulates the inner circumferential surface of the winding hole H1 of the electrode assembly to prevent the movement of the core portion C of the electrode assembly, thereby maintaining the shape of the electrode assembly and preventing contact with the current collector plate. It has the effect of stably maintaining the electrical connection structure.

Meanwhile, FIG. 17 is a cross-sectional view illustrating an internal structure of a cylindrical secondary battery when an end portion of an electrode tab is formed in a bent shape parallel to a tab coupling portion of a current collector plate.

That is, the first electrode tab may be coupled to the tab coupling portion of the current collector plate in an unbent form as shown in FIGS. 3 and 10, but as shown in FIG. It may be combined with the tab coupling portion 32 by bending it parallel to the tab coupling portion 32 .

According to this coupling form, it is possible to obtain effects of improving coupling force and reducing electrical resistance by increasing the coupling area, and also obtaining an effect of improving energy density by minimizing the total height of the electrode assembly 10 .

In addition, according to the embodiment of FIG. 17, since the length of the first electrode tab is shortened by the amount of bending, the first bent portion 31a formed around the current collector hole H2 and bent downward Correspondingly, the bending length may also be formed short. That is, even if the bending length of the first bent portion 31a matches the length of the remaining unbent first electrode tab 11, the outer circumferential surface of the first bent portion 31a and the inner circumferential surface of the winding hole H1 It has the advantage of being able to stably combine.

Preferably, the cylindrical battery cell is, for example, a cylindrical battery cell with a form factor ratio (defined as the diameter of a cylindrical battery cell divided by its height, i.e., the ratio of its height (H) to its diameter (Φ)) greater than about 0.4. can

Here, the form factor means a value representing the diameter and height of a cylindrical battery cell. Cylindrical battery cells according to an embodiment of the present invention may be, for example, 46110 cells, 48750 cells, 48110 cells, 48800 cells, or 46800 cells. In the numerical value representing the form factor, the first two numbers indicate the diameter of the cell, the next two numbers indicate the height of the cell, and the last number 0 indicates that the cross section of the cell is circular.

A battery cell according to an embodiment of the present invention may be a cylindrical battery cell having a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of about 0.418.

A battery cell according to another embodiment may be a cylindrical battery cell having a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of about 0.640.

A battery cell according to another embodiment may be a cylindrical battery cell having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of about 0.418.

A battery cell according to another embodiment may be a cylindrical battery cell having a substantially cylindrical shape, a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of about 0.600.

A battery cell according to another embodiment may be a cylindrical battery cell having a substantially cylindrical shape, a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of about 0.575.

Conventionally, battery cells having a form factor ratio of approximately 0.4 or less have been used. That is, conventionally, for example, 18650 cells, 21700 cells, etc. have been used. For an 18650 cell, its diameter is approximately 18mm, its height is approximately 65mm, and the form factor ratio is approximately 0.277.

For a 21700 cell, its diameter is approximately 21 mm, its height is approximately 70 mm, and the form factor ratio is approximately 0.300.

Referring to FIG. 18, a battery pack 3 according to an embodiment of the present invention is a secondary battery assembly in which a plurality of cylindrical secondary batteries 1 according to an embodiment of the present invention are electrically connected, as described above, and the same. It includes a pack housing (2) for accommodating. In the drawings of the present invention, components such as a bus bar, a cooling unit, and a power terminal for electrical connection are omitted for convenience of illustration.

Referring to FIG. 19 , a vehicle 5 according to an embodiment of the present invention may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and includes a battery pack 3 according to an embodiment of the present invention. include The automobile 5 includes a four-wheeled automobile and a two-wheeled automobile. The vehicle 5 operates by receiving power from the battery pack 3 according to an embodiment of the present invention.

Although the present invention has been described above with limited examples and drawings, the present invention is not limited thereto and will be described below and the technical spirit of the present invention by those skilled in the art to which the present invention belongs. Of course, various modifications and variations are possible within the scope of the claims.

5: car
3: battery pack
2: pack housing
1: Cylindrical secondary battery
10: electrode assembly
11: first electrode tab
12: second electrode tab
H1: winding hole
20: battery can
21: beading part
22: crimping part
30: current collector plate (first collector plate)
H2: collector plate hole
31: center
31a: first bent portion
32: tap joint
32a: second bent portion
32b, 32b; 3rd bend
32-1: longitudinal end
H3: injection hole
33: first can coupling part
33a: first contact portion
33b: first connection part
34: second can coupling part
34a: second contact portion
34b: second connection part
40: cap plate
41: venting part
G1: sealing gasket
50: cell terminal
G2: Insulation gasket
T1: first electrode terminal
T2: second electrode terminal
P: current collector (second collector plate)
S: Insulator

Claims (20)

An electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound in one direction to form a jelly roll, and a winding hole is formed in the center of the jelly roll shape;
a battery can accommodating the electrode assembly through an opening formed at one side and electrically connected to the first electrode;
a current collector plate coupled to a first electrode tab provided in the first electrode and a battery can, respectively;
a cap plate covering the opening of the battery can; and
A cell terminal electrically connected to a second electrode tab provided on the second electrode through the battery can at the opposite side of the opening;
The current collecting plate has a current collecting plate hole formed at a position corresponding to the winding hole, and a first bend is inserted into the winding hole around the current collecting plate hole to regulate movement of the core part of the electrode assembly around the winding hole. A cylindrical secondary battery characterized in that a portion is formed.
According to claim 1,
The cylindrical secondary battery, characterized in that the first bent portion is bent downward toward the winding hole of the electrode assembly to be adjacent to or in contact with the inner circumferential surface of the winding hole.
According to claim 1,
The cylindrical secondary battery, characterized in that the first bent portion extends continuously or discontinuously along the circumference of the current collector hole.
According to claim 1,
A cylindrical secondary battery, characterized in that the length of the first bent portion is the same as or different from the length of the first electrode tab.
According to claim 1,
The current collector plate includes a central portion having the current collector plate hole and a first bent portion, and a plurality of tab coupling portions radially extending from the central portion and spaced apart from each other and coupled to the first electrode tab. battery.
According to claim 5,
A cylindrical secondary battery, characterized in that the longitudinal end of the tab coupling portion is bent upward in a direction opposite to the first electrode tab and coupled to the inner surface of the battery can.
According to claim 5,
A cylindrical secondary battery, characterized in that a second bent portion bent upward in a direction opposite to the first electrode tab is formed on both sides of the tab coupling portion in the width direction.
According to claim 7,
A cylindrical secondary battery, characterized in that a third bent part is formed that is bent outward or inward from the second bent part in parallel with the width direction of the tap coupling part.
According to claim 5,
The current collector plate further comprises a plurality of first can coupling portions extending from the central portion between the plurality of tab coupling portions and coupled to an inner surface of the battery can.
According to claim 9,
The first can coupling part,
a first contact portion coupled to an inner surface of the battery can; and
a first connection part connecting between the central part and the contact part;
Cylindrical secondary battery comprising a.
According to claim 10,
The first contact part,
A cylindrical secondary battery, characterized in that at least a part has a shape extending along the inner circumferential surface of the battery can.
According to claim 10,
The first connection part,
A cylindrical secondary battery comprising at least one first bending portion in which an extension direction is changed.
According to claim 9,
The current collector plate further includes a second can coupling portion extending from an end of the tab coupling portion and coupled to an inner surface of the battery can,
The second can coupling portion may include a second contact portion coupled to an inner surface of the battery can; and a second connecting portion connecting the central portion and the contact portion.
Cylindrical secondary battery comprising a.
A current collector plate electrically connecting between an electrode assembly applied to a cylindrical secondary battery and a battery can,
The current collecting plate includes a central portion having a current collecting plate hole and a plurality of tab coupling portions extending radially from the central portion and being spaced apart from each other and coupled to the first electrode tab;
A first bent portion extending along a circumference of the current collector plate hole and bent downward is formed in the central portion of the current collector plate.
According to claim 14,
The current collector plate, characterized in that the longitudinal end of the tab coupling portion is bent upward in a direction opposite to the first electrode tab and coupled to the inner surface of the battery can.
According to claim 14,
The current collector plate may further include a plurality of first can coupling portions extending from the central portion between the plurality of tab coupling portions and coupled to an inner surface of the battery can.
According to claim 14,
A current collector plate, characterized in that a second bent part bent upward in a direction opposite to the first electrode tab is formed on both sides of the tab coupling part in the width direction.
According to claim 17,
A current collector plate, characterized in that a third bent portion is formed that is bent outwardly or inwardly from the second bent portion parallel to the width direction of the tab coupling portion.
A battery pack comprising the cylindrical secondary battery according to any one of claims 1 to 13.
A vehicle comprising the battery pack according to claim 19 .

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