The positive electrode collector plate, and batteries and vehicles include this collector plate.

Abstract

The invention relates to a positive electrode current collector plate structured to perform the function of stable melting while reducing resistance, and a battery and vehicle comprising such current collector plate.The battery consists of a coiled electrode assembly in which the positive electrode, negative electrode, and separator are wound in one direction, and includes a structured housing to contain the coiled electrode assembly, a structured rivet for electrical connection to the coiled electrode assembly and running through one side of the housing, and a positive electrode current collector plate positioned between the coiled electrode assembly and the rivet. It includes a rivet coupling that connects to the rivet and several lug couplings arranged externally along the radial direction of the rivet coupling to be connected to the coiled electrode assembly. The positive electrode current collector plate also includes a pair of slots arranged on the inner surface of the several lug couplings and spaced apart to face each other, and a fusion bridge forming part of the rivet coupling between the pair of slots and forming the path of current flowing from the coiled electrode assembly to the rivet.

Description

Positive current collector plate and battery including the same and automobile

[0001] The present invention relates to a positive current collector plate and a battery and automobile including the same, and in particular, to a positive current collector plate configured to perform a stable fusing function while lowering resistance and a battery and automobile including the same.

[0002] Unlike primary batteries, secondary batteries are rechargeable and rechargeable, allowing for repeated use. The scope of secondary batteries' applications is rapidly expanding, ranging from portable electronic devices such as smartphones and laptops to electric vehicles (EVs), hybrid vehicles (HEVs), and energy storage systems (ESS).

[0003] Currently commercialized rechargeable batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, and nickel-hydrogen batteries; in particular, lithium-ion batteries, which have high energy density and long lifespan, are widely used.

[0004] A secondary battery generally has a structure comprising an electrode assembly consisting of a positive electrode, a negative electrode, and a separator located between the two electrodes, and an electrolyte housed within a metal case.

[0005] In particular, cylindrical rechargeable batteries are widely used because their standardized form makes them advantageous for mass production and they offer high stability. In fields requiring high output and capacity, such as electric vehicles, battery packs are constructed by connecting numerous cylindrical battery cells in series or parallel.

[0006] Battery safety is a critical aspect; if a short circuit occurs internally or externally, excessive current flows, causing the battery temperature to rise rapidly. This can lead to thermal runaway, posing a risk of fire or explosion. To prevent the risk of fire or explosion, various safety devices are included inside the battery.

[0007] One of the safety devices is a positive current collector plate with a fusing function. A fusing-type positive current collector plate acts as a safety device that blocks the flow of current when an overcurrent flows by causing a part of the positive current collector plate (the fusing bridge) to melt and break. This operates on the same principle as a fuse in an electrical circuit.

[0008] A typical fusing anode current collector forms a fusing bridge by creating complex-shaped slits around a central rivet joint. However, this structure has the problem that the current path becomes long and complex because the current must bypass the slits even during normal operation. As the current path becomes longer, the DC Internal Resistance (DCIR) of the battery itself inevitably increases.

[0009] To maximize battery performance and increase energy efficiency, it is essential to minimize internal resistance. High resistance leads to significant energy loss during charging and discharging, and excessive heat generation negatively impacts battery life.

[0010] However, conventional fused positive current collectors are subject to a trade-off where increased resistance must be accepted to ensure safety. Therefore, a new design for a positive current collector structure is required that can lower the internal resistance of the battery itself while maintaining the fusing function that guarantees battery safety.

[0011] The present invention aims to provide a positive current collector plate of a novel structure capable of minimizing the internal resistance of a battery by optimizing the current path while performing a stable fusing function, and a battery and an automobile including the same.

[0012] A battery according to one aspect of the present invention, comprising a positive electrode, a negative electrode, and a jelly roll wound in one direction, may further comprise a can configured to accommodate the jelly roll, a rivet configured to be electrically connected to the jelly roll and pass through one side of the can, and a positive current collector plate comprising a rivet coupling portion disposed between the jelly roll and the rivet and coupled to the rivet, and a plurality of tab coupling portions provided radially outside the rivet coupling portion to be coupled to the jelly roll, wherein the positive current collector plate may further comprise a pair of slits disposed inside the plurality of tab coupling portions and spaced apart to face each other, and a fusing bridge that forms a part of the rivet coupling portion between the pair of slits and forms a path for current flowing from the jelly roll to the rivet.

[0013] In addition, the fusing bridge is configured to be short-circuited by a current greater than a predetermined value flowing along the fusing bridge, and the width of the fusing bridge may be greater than the length of the fusing bridge.

[0014] In addition, the above pair of slits can be arranged parallel to each other.

[0015] Additionally, each of the above pair of slits may include a main slit having an arc shape and a sub-slit extending along a straight direction from both ends of the main slit.

[0016] In addition, the fusing bridge may include a pair of fusing bridges provided at one end and the other end of the pair of slits, respectively.

[0017] In addition, among the plurality of tab joints, the first tab joint positioned adjacent to the rivet joint can be configured to be approximately parallel to the pair of slits.

[0018] In addition, the first path of the current flowing from the first tab joint to the rivet joint can be configured to pass through the fusing bridge in an approximately straight direction.

[0019] In addition, the first path may be the shortest path from the first tab joint to the center of the rivet joint.

[0020] In addition, the width of the fusing bridge may be 3.0 mm to 6.0 mm.

[0021] In addition, the width of the fusing bridge may be 5.5 mm or less.

[0022] In addition, the length of the fusing bridge may be 2.0 mm to 5.0 mm.

[0023] In addition, the length of the fusing bridge may be 3 mm or more.

[0024] In addition, the battery includes a cylindrical battery cell, and the DC internal resistance of the cylindrical battery cell may be 2.3 mΩ or less.

[0025] An automobile according to one aspect of the present invention may include a battery as described in claim 1.

[0026] According to one aspect of the present invention, an anode current collector plate disposed between a jelly roll in which an anode, a cathode, and a separator are wound in one direction and a rivet electrically connected to the jelly roll may include a rivet coupling portion coupled to the rivet, a plurality of tab coupling portions provided radially outward from the rivet coupling portion to be coupled to the jelly roll, a pair of slits provided inwardly from the plurality of tab coupling portions and spaced apart to face each other, and a fusing bridge that forms a part of the rivet coupling portion between the pair of slits and constitutes a path for current flowing from the jelly roll to the rivet.

[0027] The positive current collector according to the present invention, and the battery and automobile including the same, can significantly reduce the DC internal resistance (DCIR) of the battery cell by simplifying the fusing bridge of the positive current collector into a pair of slit structures and optimizing the position of the tab coupling portion connected to the foil tab of the positive non-fusing portion so that the current passes through the fusing bridge in the shortest straight path, thereby drastically shortening the current path.

[0028] The positive current collector according to the present invention, and the battery and automobile including the same, can improve the charge and discharge efficiency of the battery cell and reduce unnecessary heat generation as the internal DC resistance is reduced, thereby improving the overall performance and lifespan of the battery.

[0029] The positive current collector according to the present invention, and the battery and automobile including the same, can effectively balance resistance and fusing time with only a simple design change that adjusts the width and length of the fusing bridge, and thereby simultaneously secure a reliable fusing function that safely protects the battery in the event of an overcurrent while maintaining or lowering the resistance.

[0030] FIG. 1 is a drawing illustrating a cylindrical battery cell in a battery according to a first embodiment of the present invention.

[0031] FIG. 2 is a drawing showing a cross-sectional view of a cylindrical battery cell in a battery according to a first embodiment of the present invention.

[0032] FIG. 3 is a drawing illustrating the structure of a jelly roll before winding in a battery according to the first embodiment of the present invention.

[0033] FIG. 4 is a drawing illustrating a positive current collector plate in a battery according to the first embodiment of the present invention.

[0034] FIG. 5 is a drawing illustrating a positive current collector plate in a battery according to a second embodiment of the present invention.

[0035] FIG. 6 is a drawing illustrating a battery pack in a battery according to a first embodiment of the present invention.

[0036] FIG. 7 is a drawing illustrating a vehicle equipped with a battery according to a first embodiment of the present invention.

[0037] The embodiments described in this specification and the configurations illustrated in the drawings are merely preferred examples of the disclosed invention, and various modifications that may replace the embodiments and drawings of this specification may exist at the time of filing this application.

[0038] Additionally, the same reference numbers or symbols presented in each figure of this specification represent parts or components that perform substantially the same function. Furthermore, the terms used in this specification are for describing embodiments and are not intended to limit or / or restrict the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0039] In this specification, terms such as “comprising” or “having” are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0040] Additionally, terms including ordinal numbers, such as "first," "second," etc., used in this specification may be used to describe various components, but said components are not limited by said terms, and said terms are used solely for the purpose of distinguishing one component from another.

[0041] Meanwhile, terms such as “front,” “rear,” “upper,” and “lower” used in the following description are defined based on the drawings, and the shape and location of each component are not limited by these terms.

[0042] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0043] In describing the embodiments, the term "axial direction" refers to the direction in which the axis forming the winding center of the jelly roll extends, the term "radial direction" refers to the direction toward (centripetal) or toward (centrifugal) the axis, and the term "circumferential direction" refers to the direction surrounding the axis.

[0044] The width direction of the jelly roll in its unfolded state corresponds to the axis direction of the jelly roll. The length direction of the jelly roll in its unfolded state corresponds to the circumference direction of the jelly roll.

[0045] FIG. 1 is a drawing illustrating a cylindrical battery cell in a battery according to a first embodiment of the present invention. FIG. 2 is a drawing illustrating a longitudinal section of a cylindrical battery cell in a battery according to a first embodiment of the present invention. FIG. 3 is a drawing illustrating the structure of a jelly roll before winding in a battery according to a first embodiment of the present invention.

[0046] Referring to FIGS. 1 to 3, the cylindrical battery cell (10) included in the battery (1) according to the present invention may include a cylindrical battery cell (10) having a ratio of form factor (defined as the ratio of the diameter of the cylindrical battery cell to the height, i.e., the ratio of the diameter to the height) greater than approximately 0.4.

[0047] Here, form factor refers to a value representing the diameter and height of a cylindrical battery cell (10). For example, the cylindrical battery cell (10) may be a 4611 cell, a 4875 cell, a 4811 cell, a 4880 cell, or a 4680 cell.

[0048] In the figures representing the form factor, the first two numbers represent the diameter of the cylindrical battery cell (10), and the next two numbers represent the height of the cylindrical battery cell (10).

[0049] In addition, the present invention may be applied to cylindrical battery cells (10) having a form factor ratio of approximately 0.4 or less, for example, 1865 cells or 2170 cells, etc.

[0050] A cylindrical battery cell (10) can be formed by embedding a jelly roll (11) in a can (12) which is a cylindrical metal. The cylindrical battery cell (10) may include a jelly roll (11) and a can (12) for receiving the jelly roll (11).

[0051] An insulator (15) may be placed on the top of the jelly roll (11), and a gasket (not shown) may be placed on the bottom of the jelly roll (11).

[0052] The jelly roll (11) has a structure in which a positive electrode (20), a negative electrode (30), and a separator (40) placed between the positive electrode (20) and the negative electrode (30) are interposed and wound, and a center pin (14) can be inserted in the center thereof.

[0053] A cylindrical battery cell (10) can be formed by placing a jelly roll (11) in a can (12) and injecting an electrolyte into the can (12).

[0054] The can (12) is a cylindrical container with an opening formed at the top or bottom, and may be made of a conductive metal material such as aluminum or steel. The can (12) can accommodate a jelly roll (11) in its inner space through the top or bottom opening, and may also accommodate an electrolyte (not shown).

[0055] The center pin (14) may include a metal material to provide a certain strength and may be formed into a cylindrical structure formed by bending a plate into a round shape. In addition to self-heating, the center pin (14) may fix and support the jelly roll (11) and may function as a passage for releasing gas generated by an internal reaction during the charging and discharging operation of the cylindrical battery cell (10).

[0056] The electrolyte injected into the can (12) may be a lithium salt-containing non-aqueous electrolyte, and the lithium salt-containing non-aqueous electrolyte may include a non-aqueous electrolyte and a lithium salt. As the non-aqueous electrolyte, a non-aqueous organic solvent, an organic solid electrolyte, an inorganic solid electrolyte, etc. may be used. However, it is not limited thereto.

[0057] A sealing tape (not shown) may be placed on the outer surface of the jelly roll (11). The sealing tape (not shown) may be placed along the circumferential direction on the outer surface of the jelly roll (11) and may be attached to the outer surface of the jelly roll (11) by an adhesive layer on the lower surface of the sealing tape (not shown).

[0058] However, it is not limited to this, and the sealing tape (not shown) can be placed on the upper and lower sides of the outer surface of the jelly roll (11), respectively, and can be attached to the outer surface of the jelly roll (11) by various methods other than an adhesive provided on the lower surface of the sealing tape (not shown).

[0059] The sealing tape (not shown) may be made of an electrically insulating material to prevent contact with the positive electrode (20). However, it is not limited thereto, and the sealing tape (not shown) may be made of an electrically conductive material to prevent interference with current flow.

[0060] The sealing tape (not shown) may be manufactured from materials such as PET, PP, PI, etc., and may include a swelling tape that expands by absorbing a non-aqueous electrolyte. However, it is not limited thereto.

[0061] A cylindrical battery cell (10) may include a current collector plate (50) electrically connected to a jelly roll (11), and the current collector plate (50) may be accommodated in a can (12) together with the jelly roll (11).

[0062] The can (12) may include an upper can (12a) and a side wall can (12b) connected to the upper can (12a) and extending axially. The side wall can (12b) may be bent and extended from the upper can (12a). One end of the side wall can (12b) facing the upper can (12a) may be formed open.

[0063] The can (12) may include a lid (16) configured to cover one end of an open side wall can (12b). The upper can (12a) may have a disc shape with a hole formed in the center, and the side wall can (12b) may have a circular tubular shape.

[0064] The upper can (12a) and the side wall can (12b) can be manufactured by forming a metal sheet with nickel plated on the surface of steel using a deep drawing process, and then trimming the front end of the side wall can (12b) with a punch while holding it with a blank holder. However, it is not limited to this.

[0065] A rivet (13) can be fitted into the hole of the upper can (12a). The rivet (13) can be fixed by riveting it to the upper can (12a) with a rivet gasket (13a) interposed between the hole of the upper can (12a) and the rivet (13).

[0066] The rivet gasket (13a) is interposed between the rivet (13) and the upper can (12a) to seal the inside and outside of the can (12) to prevent leakage of the electrolyte and to electrically insulate the rivet (13) and the upper can (12a).

[0067] However, the method of connecting the rivet (13) and the upper can (12a) is not limited to this. For example, if the structure can seal the space between the rivet (13) and the upper can (12a) and electrically insulate the rivet (13) and the upper can (12a), various other fastening methods may be applied, such as a bolt-nut connection method, a glass seal method, or a chrome coating & PP-MAH thermal bonding method.

[0068] The rivet (13) may have a first polarity, and the can (12) may have a second polarity. The upper can (12a) of the can (12), the side wall can (12b) extending from the upper can (12a), and the lead (16) connected to the side wall can (12b) may all have a second polarity as a whole.

[0069] The cylindrical battery cell (10) according to the present invention may include an electrode terminal configured to be electrically connected to a jelly roll (11). The electrode terminal may include a first electrode terminal having a first polarity and a second electrode terminal having a second polarity.

[0070] A rivet (13) having a first polarity can form a first electrode terminal, and a can (12) and a lead (16) having a second polarity can form a second electrode terminal.

[0071] A cylindrical battery cell (10) may have both a first electrode terminal composed of a rivet (13) having a first polarity and a second electrode terminal composed of an upper can (12a) having a second polarity arranged at an axial end, i.e., a closed end, which is equipped with an upper can (12a).

[0072] Accordingly, the busbar (not shown) connected to the rivet (13) and the busbar (not shown) connected to the upper can (12a) can both be located on the upper part of the cylindrical battery cell (10).

[0073] The first electrode terminal formed by the rivet (13) may be a positive terminal, and the second electrode terminal formed by the can (12) may be a negative terminal.

[0074] The can (12) may include a crimping portion (not shown) and a beading portion (not shown). The beading portion (not shown) is for stable bonding of the cap assembly including the lid (16) and may be formed along the circumferential direction on the outer surface of the can (12) or may be formed by indenting concavely from the outer surface of the can (12) toward the center of the jelly roll (11). The beading portion (not shown) may prevent flow of the jelly roll (11).

[0075] A crimping portion (not shown) may be positioned above or below a beading portion (not shown) and formed to wrap around the edge portion of a cap assembly containing a lead (16) along the circumferential direction. The crimping portion (not shown) may facilitate a stable bond of the cap assembly.

[0076] The jelly roll (11) may include a long sheet-shaped anode (20), a cathode (30), and a separator (40) disposed between the anode (20) and the cathode (30). The separator (40) is disposed above or below the anode (20) so that when the anode (20) is wound into the shape of the jelly roll (11), it can physically separate the anode (20) and the cathode (30) to prevent an electrical short circuit between the anode (20) and the cathode (30).

[0077] The separator (40) may include a plurality of separators (40) disposed between the anode (20) and the cathode (30), above or below the anode (20), and above or below the cathode (30). Additionally, a separator (40) may be additionally disposed below the cathode (30) to prevent contact between the anode (20) and the cathode (30) when wound in the form of a jelly roll (11).

[0078] The separator (40) separates the negative electrode (30) and the positive electrode (20) and provides a passage for the movement of lithium ions; it can be used without special restrictions as long as it is used as a separator in a lithium secondary battery.

[0079] The positive electrode (20) may include a positive electrode foil (21) and a positive electrode active material layer (22) formed on one or both sides of the positive electrode foil (21). The negative electrode (30) may include a negative electrode foil (31) and a negative electrode active material layer (32) formed on one or both sides of the negative electrode foil (31).

[0080] The positive foil (21) may include aluminum (Al) to form the positive electrode (20) together with the positive active material layer (22), and the negative foil (31) may include copper (Cu) to form the negative electrode (30) together with the negative active material layer (32). However, it is not limited thereto.

[0081] The positive active material layer (22) can be formed by coating the positive foil (21), and the negative active material layer (32) can be formed by coating the negative foil (31).

[0082] The positive electrode active material layer (22) may have a nanostructure, which can improve electrical conductivity and increase the surface area of ​​the positive electrode (20), thereby improving the electrochemical reaction rate. The negative electrode active material layer (32) may include graphite and may undergo surface modification treatment to maximize reactivity with lithium ions.

[0083] The positive active material layer (22) or negative active material layer (32) may include a positive active material or a negative active material, a conductive material, and a binder.

[0084] Specifically, the anode (20) or cathode (30) can be manufactured by applying an anode slurry or cathode slurry, prepared by dispersing an anode active material or cathode active material, a conductive material, and / or a binder in a solvent such as dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, etc., onto one or both sides of a long sheet-shaped anode foil (21) or cathode foil (31), and then removing the solvent of the anode slurry or cathode slurry through a drying process and rolling.

[0085] The cathode active material may be any of the various cathode active materials used in the industry, such as carbon-based cathode active materials, silicon-based cathode active materials, or mixtures thereof.

[0086] A conductive material is used to impart conductivity to an electrode, and in the secondary battery being constructed, any material that possesses electronic conductivity without causing chemical changes can be used without any special restrictions.

[0087] The binder can perform the role of improving adhesion between positive active material or negative active material particles and adhesion between the positive active material layer (22) and the positive foil (21) or adhesion between the negative active material layer (32) and the negative foil (31).

[0088] The jelly roll (11) can be manufactured in a wound form by winding a laminate formed by sequentially stacking a cathode (30), a separator (40), an anode (20), and a separator (40) at least once, in one direction around a center pin (14).

[0089] The positive electrode (20) may include a positive electrode retaining portion (23) in which a positive electrode active material layer (22) is formed on a long sheet-shaped positive electrode foil (21), and a positive electrode blank portion (24) in which the positive electrode active material layer (22) is not formed in a portion of the positive electrode foil (21). The positive electrode blank portion (24) may be provided on one side in the width direction of the positive electrode foil (21).

[0090] The cathode (30) may include a cathode retaining portion (33) in which a cathode active material layer (32) is formed on a long sheet-shaped cathode foil (31), and a cathode blank portion (34) in which the cathode active material layer (32) is not formed in a portion of the cathode foil (31). The cathode blank portion (34) may be provided on the other side in the width direction of the cathode foil (31) so as to face the anode blank portion (24).

[0091] The positive blank section (24) and the negative blank section (34) may be exposed or protruded in the width direction from the jelly roll (11) before winding. The positive blank section (24) itself may function as a positive tab, and the negative blank section (34) itself may function as a negative tab.

[0092] In the positive electrode blank (24), a notch can be formed at a predetermined interval to form a flag-shaped positive foil tab (24a), and in the negative electrode blank (34), a notch can be formed at a predetermined interval to form a flag-shaped negative foil tab (34a).

[0093] In the drawing, the positive foil tab (24a) and the negative foil tab (34a) are shown to be in the shape of an isosceles trapezoid. However, they are not limited thereto, and for example, the shapes of the positive foil tab (24a) and the negative foil tab (34a) may include various shapes such as a semicircle, a semi-ellipse, a triangle, a rectangle, a parallelogram, etc.

[0094] In the drawing, the positive foil tab (24a) and the negative foil tab (34a) arranged along the longitudinal direction are shown having the same width. However, this is not limited thereto, and for example, the width of the positive foil tab (24a) and the negative foil tab (34a) may include a shape in which it gradually or stepwise widens from the core side to the outer periphery side.

[0095] In the drawing, the height of the positive foil tab (24a) and the negative foil tab (34a) is shown to increase in stages from the core side to the outer side. However, this is not limited thereto, and for example, the height of the positive foil tab (24a) and the negative foil tab (34a) may be implemented in a constant or gradually decreasing form.

[0096] In the drawing, a structure is shown in which the positive foil tab (24a) and the negative foil tab (34a) are removed from a predetermined section of the central end and a predetermined section of the centrifugal end of the positive foil section (24) and the negative foil section (34). However, this is not limited thereto, and for example, the positive foil tab (24a) and the negative foil tab (34a) may not be removed from the central end of the positive foil section (24) and the negative foil section (34), and the positive foil tab (24a) and the negative foil tab (34a) may not be removed from the centrifugal end of the positive foil section (24) and the negative foil section (34).

[0097] In the jelly roll (11), the positive foil tab (24a) and the negative foil tab (34a) can be folded radially and flattened. The positive foil tab (24a) and the negative foil tab (34a) can be folded radially inward or outward. In the drawing, the positive foil tab (24a) and the negative foil tab (34a) are shown as having a structure folded radially inward, but are not limited thereto.

[0098] The positive foil tab (24a) and the negative foil tab (34a) can be folded one by one during the process of forming them by winding the jelly roll (11) before winding. Alternatively, the positive foil tab (24a) and the negative foil tab (34a) may be folded all at once after forming them by winding the jelly roll (11) before winding.

[0099] The positive foil tab (24a) and the negative foil tab (34a), which are folded radially and overlapped, can each provide a plane that is approximately perpendicular to the axial direction at both axial ends of the jelly roll (11).

[0100] A current collector plate (50) can be bonded to a flat surface provided by folding the positive foil tab (24a) and negative foil tab (34a) exposed at both axial ends of the jelly roll (11).

[0101] The current collector plate (50) may include an anode current collector plate (51) positioned to be joined to the anode foil tab (24a), and a cathode current collector plate (52) positioned opposite to the anode current collector plate (51) to be joined to the cathode foil tab (34a).

[0102] The positive electrode collector plate (51) may include aluminum material, and the negative electrode collector plate (52) may include copper material. The positive electrode collector plate (51) and the negative electrode collector plate (52) may be manufactured by punching, trimming, piercing, and folding a metal sheet. However, they are not limited thereto.

[0103] The positive electrode collector plate (51) can be joined to the positive electrode foil tab (24a) of the positive electrode (20) by means such as laser welding before the jelly roll (11) is placed in the can (12). That is, the positive electrode collector plate (51) may include a tab joining portion (54, see FIG. 4) provided to be joined to the positive electrode foil tab (24a) through means such as laser welding.

[0104] The jelly roll (11) can be accommodated in the can (12) with the positive current collector plate (51) aligned so as to face the upper can (12a) of the can (12). At this time, an insulator (15) can be interposed between the positive current collector plate (51) and the upper can (12a) of the can (12) to electrically insulate the positive current collector plate (51) and the upper can (12a).

[0105] The positive electrode collector plate (51) can be joined to the can (12) by means of resistance welding, ultrasonic welding, or laser welding, etc., with a rivet (13) fixed to the can (12). A welding device (not shown) for welding the positive electrode collector plate (51) and the rivet (13) can proceed with welding by approaching the back side of the center of the positive electrode collector plate (51) through the hollow of the jelly roll (11) from the bottom open end of the can (12).

[0106] That is, the positive current collector plate (51) may include a rivet joint part (53, see FIG. 4) that is formed to be joined with a rivet (13) through a method such as laser welding.

[0107] Of course, in addition to this, the positive current collector plate (51) and the rivet (13) can be joined by brazing or soldering methods. That is, the joining of the positive current collector plate (51) and the rivet (13) can be done in various ways as long as the joining method allows them to be electrically connected and mutually fixed.

[0108] The cathode collector plate (52) can be connected to the cathode foil tab (34a) of the cathode (30). The cathode collector plate (52) can be electrically connected to the cathode foil tab (34a) of the cathode (30) by welding it with an irradiated laser. The welding line of the laser can be extended radially.

[0109] The negative electrode collector plate (52) may be provided with a collector plate hole (not shown) corresponding to a hollow, into which a center pin (14) for winding the jelly roll (11) is inserted.

[0110] With the jelly roll (11) contained inside the can (12), the cathode foil tab (34a) of the cathode (30) and the cathode collector plate (52) can be positioned to face the open end of the side wall can (12b). Then, the outer surface of the cathode collector plate (52) can be pressed into contact with the inner surface of the side wall can (12b).

[0111] The inner surface of the side wall can (12b) and the outer surface of the negative electrode collector plate (52) can be joined together through seam welding, etc. The lower open end of the side wall can (12b) can be covered by a lead (16), and the inner surface of the side wall can (12b) and the lead (16) can be joined and finished through seam welding, etc. However, it is not limited thereto.

[0112] Electrolyte can be injected into the interior of the can (12) through the injection port (16a) provided in the center of the lid (16). After injecting the electrolyte, the injection port (16a) can be closed by a plug (16b).

[0113] Of course, the welding structure of the present invention can also be applied to a lid (16) that is not provided with an injection port (16a) and a plug (16b). According to this, the electrolyte can be injected first before covering the open end of the side wall can (12b) with the lid (16), and after the injection of the electrolyte is completed, the open end of the side wall can (12b) can be covered with the lid (16) to finish.

[0114] The edge of the lid (16) can be seam welded to the edge of the sidewall can (12b) with a laser (L) and joined, and accordingly, the can (12) can be sealed.

[0115] However, it is not limited thereto, and the cylindrical battery cell (10) according to the present invention may not include a separate lead (16), and the negative electrode current collector (52) may perform the function of the lead (16). In this case, the negative electrode current collector (52) may form the exterior of the cylindrical battery cell (10) together with the can (12), and the can (12) and the negative electrode current collector (52) may function as a second electrode terminal.

[0116] The material of the negative electrode collector plate (52) may be softer than the material of the side wall can (12b). The thermal conductivity of the negative electrode collector plate (52) may be higher than the thermal conductivity of the side wall can (12b). For example, the material of the negative electrode collector plate (52) may include copper, and the material of the side wall can (12b) may include iron. However, it is not limited thereto.

[0117] FIG. 4 is a drawing illustrating a positive current collector plate in a battery according to a first embodiment of the present invention. Referring to FIGS. 1 to 4, a battery (1) according to a first embodiment of the present invention may include a positive electrode (20), a negative electrode (30), and a separator (40) wound in one direction, a jelly roll (11), and a can (12) configured to accommodate the jelly roll (11).

[0118] A battery (1) according to the first embodiment of the present invention may include a rivet (13) electrically connected to a jelly roll (11) and configured to pass through one side of a can (12), and an anode current collector (51) disposed between the jelly roll (11) and the rivet (13).

[0119] The positive current collector plate (51) may include a roughly disc shape and may include a metal material with excellent electrical conductivity such as aluminum (Al).

[0120] The positive electrode collector plate (51) may include a rivet joint portion (53) that is joined to a rivet (13), and a tab joint portion (54) provided on the radially outer side of the rivet joint portion (53) to be joined to a jelly roll (11). The rivet joint portion (53) may be located in the central region of the positive electrode collector plate (51) and may be electrically connected by being joined to the rivet (13) through laser welding or the like.

[0121] The tab joint portion (54) may include a plurality of tab joint portions (54). The plurality of tab joint portions (54) may be spaced apart from each other on the radially outer side of the rivet joint portion (53).

[0122] Current can flow from the jelly roll (11) to the positive current collector plate (51) through a plurality of tap joints (54), and current can flow from the positive current collector plate (51) to the rivet (13) through a rivet joint (53).

[0123] A plurality of tab coupling portions (54) may be arranged radially along the circumferential direction on a disc-shaped positive current collector plate (51). This may be a structure advantageous for uniformly collecting current from positive foil tabs (24a) distributed along the circumferential direction of the jelly roll (11) to the positive current collector plate (51). However, it is not limited thereto.

[0124] A plurality of tap joints (54) can be joined by welding to an anode foil tab (24a) provided on the anode (20) of the jelly roll (11), and the welding between the plurality of tap joints (54) and the anode foil tab (24a) can be formed in the form of a plurality of welding beads. The current generated in the anode active material layer (22) can be collected in the anode current collector plate (51) by the plurality of tap joints (54) including a plurality of welding beads.

[0125] The weld bead shape of the tap joint portion (54) may include a straight line or a wavy form. A wavy weld bead shape can increase the welding area to help ensure a stable connection and relieve stress caused by thermal expansion. However, it is not limited thereto.

[0126] The positive current collector plate (51) according to the first embodiment of the present invention may include a pair of slits (55) arranged spaced apart from each other and provided inside a plurality of tab coupling portions (54), and a fusing bridge (100) provided between the pair of slits (55).

[0127] The fusing bridge (100) can form a path (p) for current flowing from the jelly roll (11) to the rivet (13), and can be configured to be short-circuited by a current greater than a predetermined value flowing along the fusing bridge (100). That is, the fusing bridge (100) can correspond to a safety device that can melt and break when an overcurrent flows through the positive current collector plate (51).

[0128] The fusing bridge (100) can function as a bridge located between a pair of slits (55).

[0129] The fusing bridge (100) may form part of the rivet joint (53). However, it is not limited thereto, and the rivet joint (53) may overlap with the area of ​​the fusing bridge (100) and a pair of slits (55), and the rivet joint (53) may be provided at the center of the positive current collector plate (51) and separated between the fusing bridge (100) and a pair of slits (55).

[0130] A pair of slits (55) according to the first embodiment of the present invention may be arranged parallel to each other. A pair of slits (55) may be arranged so as to be spaced apart and facing each other in approximately parallel. However, they are not limited thereto.

[0131] Each of the pair of slits (55) may include a main slit (56) having an arc shape and a sub-slit (57) extending along a straight direction from both ends of the main slit (56).

[0132] The main slit (56) can form part of a tube shape or a donut shape. The sub-slit (57) extends from both ends of the main slit (56), thereby allowing the length (l) of the fusing bridge (100) to be extended without increasing the size of the main slit (56).

[0133] The fusing bridge (100) may include a pair of fusing bridges (100) each provided at one end and the other end of a pair of slits (55). The fusing bridge (100) according to the first embodiment of the present invention may be composed of two fusing bridges (100), including a pair of fusing bridges (100).

[0134] A pair of fusing bridges (100) may be spaced apart so as to face each other with respect to the center of the positive current collector plate (51). Each of the pair of fusing bridges (100) may form a rectangular area. Each of the pair of fusing bridges (100) may form a rectangular area. However, it is not limited thereto.

[0135] Among the plurality of tap joints (54), the first tap joint (54a) positioned adjacent to the rivet joint (53) can be configured to be approximately parallel to a pair of slits (55). Accordingly, the first path (p1) of the current flowing from the first tap joint (54a) to the rivet joint (53) can be configured to pass through the fusing bridge (100) in an approximately straight direction.

[0136] That is, the first path (p1) may be the shortest path from the first tab joint (54a) toward the center of the rivet joint (53).

[0137] According to the first embodiment of the present invention, the positive current collector plate (51) can form the shortest distance for the first path (p1) of current flowing from the first tab coupling part (54a) to the rivet coupling part (53) through the fusing bridge (100), and the first path (p1) can form a straight line without bending or detouring. Accordingly, according to the physical law (R∝l) that electrical resistance is proportional to the length of the path, it can perform the decisive function of minimizing the DC internal resistance (DCIR) of the cylindrical battery cell (10) including the positive current collector plate (51).

[0138] Here, to briefly explain the method for measuring the DC internal resistance (DCIR) of a cylindrical battery cell (10), first, the cylindrical battery cell (10) can be discharged at a low speed using a relatively low current of 1 C / 3 to completely discharge the residual charge of the cylindrical battery cell (10). By using a low current of 1 C / 3, the cylindrical battery cell (10) can be made into a stable and uniform state.

[0139] 1C is the size of the current that can fully charge or discharge the rated capacity of the cylindrical battery cell (10) for 1 hour, and 1C / 3 is the size of the current that can fully charge or discharge the rated capacity of the cylindrical battery cell (10) for 3 hours.

[0140] Next, the actual total capacity of the cylindrical battery cell (10) can be measured by measuring the total charge released by the cylindrical battery cell (10) while fully charging the cylindrical battery cell (10) with a low current of 1 C / 3 and then fully discharging the cylindrical battery cell (10) with a low current of 1 C / 3.

[0141] By pre-processing the cylindrical battery cell (10) before measurement, the cylindrical battery cell (10) is made stable before measurement, thereby minimizing the influence of the previous usage history of the cylindrical battery cell (10) on the measurement results and creating consistent measurement conditions.

[0142] Afterwards, the cylindrical battery cell (10) can be fully charged with a low current of 1 C / 3, and then discharged with a low current of 1 C / 3, only 50% of the measured actual total capacity of the cylindrical battery cell (10), thereby configuring the State of Charge (SOC) of the cylindrical battery cell (10) to a SOC 50 state.

[0143] Since the DC internal resistance (DCIR) of the cylindrical battery cell (10) can change depending on the state of charge (SOC) of the cylindrical battery cell (10), the state of charge (SOC) of the cylindrical battery cell (10) may correspond to the state of charge (SOC) that is generally set for accurate measurement of the DC internal resistance (DCIR) of the cylindrical battery cell (10). For example, when the SOC is 20% or less or 80% or more, the DC internal resistance (DCIR) may increase rapidly.

[0144] A constant current (pulse) is applied to a cylindrical battery cell (10) in an SOC 50 state for about 10 seconds to measure the current and voltage before and after the application of current, and according to Ohm's law, which states that the DC internal resistance (DCIR) is proportional to the change in voltage and inversely proportional to the change in current, the DC internal resistance (DCIR) of the cylindrical battery cell (10) can be measured.

[0145] The measurement time of about 10 seconds may be the optimal time to capture the point at which the voltage stabilizes relatively after the complex resistance components are sufficiently expressed as current is applied to the cylindrical battery cell (10). This measurement method can be called the Pulse Test Method.

[0146] The positive current collector plate (51) according to the first embodiment of the present invention can balance the resistance (R) and fusing performance of the fusing bridge (100) by optimizing the physical shape (number (N), width (w), and length (l)) of the fusing bridge (100). The resistance (R) of the fusing bridge (100) may be proportional to the resistivity (ρ) and length (l), and inversely proportional to the width (w), thickness (t), and number (N).

[0147] Here, since the resistivity (ρ) and thickness (t) of the fusing bridge (100) may not change as constants, the resistance (R) and fusing performance of the fusing bridge (100) can be optimized by modifying the physical shape including the number (N), width (w), and length (l) of the fusing bridge (100).

[0148] The fusing bridge (100) according to the first embodiment of the present invention can reduce the number (N) of the fusing bridge (100) from the usual 4 to 2, widen the width (w), and reduce the length (l).

[0149] That is, the fusing bridge (100) according to the first embodiment of the present invention can have a small number and form a wide bridge area. If the number (N) of the fusing bridge (100) is reduced, the resistance (R) of the fusing bridge (100) may increase, but if the width (w) is widened, the resistance (R) of the fusing bridge (100) may decrease.

[0150] Accordingly, the fusing bridge (100) according to the first embodiment of the present invention can maximize the performance of the cylindrical battery cell (10) by reducing the DC internal resistance (DCIR) of the cylindrical battery cell (10) including the positive current collector plate (51) by modifying the physical shape including the number (N), width (w), and length (l) to minimize the change in the resistance (R) value of the fusing bridge (100) required for fusing, while simplifying the structure of the fusing bridge (100) to shorten the path (p) of the current flowing from the tab joint (54) to the rivet joint (53).

[0151] That is, the battery (1) according to the first embodiment of the present invention can maximize the performance of the cylindrical battery cell (10) by reducing the DC internal resistance (DCIR) of the cylindrical battery cell (10) while minimizing changes in the fusing time of the fusing bridge (100).

[0152] According to the first embodiment of the present invention, the width (w) of the fusing bridge (100) may be greater than the length (l) of the fusing bridge (100). The width (w) of the fusing bridge (100) may be 3.0 mm to 6.0 mm. Preferably, the width (w) of the fusing bridge (100) may be 3.75 mm to 5.5 mm. More preferably, the width (w) of the fusing bridge (100) may be 3.75 mm or 5.5 mm. However, it is not limited thereto.

[0153] The length (l) of the fusing bridge (100) may be 2.0 mm to 5.0 mm. Preferably, the length (l) of the fusing bridge (100) may be 3 mm or more. More preferably, the length (l) of the fusing bridge (100) may be 3 mm. However, it is not limited thereto.

[0154] Accordingly, the DC internal resistance (DCIR) of the cylindrical battery cell (10) including the fusing bridge (100) according to the first embodiment of the present invention may be 2.3 mΩ or less. Preferably, the DC internal resistance (DCIR) of the cylindrical battery cell (10) may be approximately 2.2 mΩ or 1.5 mΩ. However, it is not limited thereto.

[0155] That is, when the length of the fusing bridge (100) is 3 mm and the width (w) of the fusing bridge (100) is 5.5 mm, the DC internal resistance (DCIR) of the cylindrical battery cell (10) may be 1.5 mΩ, and when the length of the fusing bridge (100) is 3 mm and the width (w) of the fusing bridge (100) is 3.75 mm, the DC internal resistance (DCIR) of the cylindrical battery cell (10) may be approximately 2.2 mΩ. However, it is not limited thereto.

[0156] That is, the width of the fusing bridge (100) according to the first embodiment of the present invention may be greater than or equal to the width of the first tap coupling part (54a) adjacent to the fusing bridge (100) among the plurality of tap coupling parts (54). Accordingly, the total current flowing along the first tap coupling part (54a) can pass through the fusing bridge (100) along a straight path in the shortest path.

[0157] Accordingly, the cylindrical battery cell (10) including the fusing bridge (100) according to the first embodiment of the present invention can have the number (N) of the fusing bridge (100) reduced, but the resistance (R) across the fusing bridge (100) can be maintained, and by shortening the path (p) of the current flowing from the tab coupling part (54) to the rivet coupling part (53), the performance can be maximized by lowering the DC internal resistance (DCIR) of the cylindrical battery cell (10) while performing the fusing function of the fusing bridge (100).

[0158] FIG. 5 is a drawing illustrating a positive current collector plate in a battery according to a second embodiment of the present invention. Referring to FIGS. 1 to 3 and FIG. 5, a battery (2) including a current collector plate (60) according to a second embodiment of the present invention may include a jelly roll (11) in which a positive electrode (20), a negative electrode (30), and a separator (40) are wound in one direction, and a can (12) configured to accommodate the jelly roll (11). The current collector plate (60) according to a second embodiment of the present invention may include a positive current collector plate (61).

[0159] A battery (2) including a positive current collector plate (61) according to a second embodiment of the present invention may include a rivet (13) electrically connected to a jelly roll (11) and configured to pass through one side of a can (12), and a positive current collector plate (61) disposed between the jelly roll (11) and the rivet (13).

[0160] The positive current collector plate (61) may include a roughly disc shape and may include a metal material with excellent electrical conductivity such as aluminum (Al).

[0161] The positive electrode collector plate (61) may include a rivet joint portion (63) that is joined to a rivet (13), and a tab joint portion (64) provided on the radially outer side of the rivet joint portion (63) to be joined to a jelly roll (11). The rivet joint portion (63) may be located in the central region of the positive electrode collector plate (61) and may be electrically connected by being joined to the rivet (13) through laser welding or the like.

[0162] The tab joint portion (64) may include a plurality of tab joint portions (64). The plurality of tab joint portions (64) may be spaced apart from each other on the radially outer side of the rivet joint portion (63).

[0163] Current can flow from the jelly roll (11) to the positive current collector plate (61) through a plurality of tap joints (64), and current can flow from the positive current collector plate (61) to the rivet (13) through a rivet joint (63).

[0164] A plurality of tab coupling portions (64) may be arranged radially along the circumferential direction on a disc-shaped positive current collector plate (61). This may be a structure advantageous for uniformly collecting current from positive foil tabs (24a) distributed along the circumferential direction of the jelly roll (11) to the positive current collector plate (61). However, it is not limited thereto.

[0165] A plurality of tab joints (64) can be joined by welding to an anode foil tab (24a) provided on the anode (20) of the jelly roll (11), and the welding between the plurality of tab joints (64) and the anode foil tab (24a) can be formed in the form of a plurality of welding beads. The current generated in the anode active material layer (22) can be collected in the anode current collector plate (61) by the plurality of tab joints (64) including a plurality of welding beads.

[0166] The weld bead shape of the tap joint portion (64) may include a straight line or a wavy form. A wavy weld bead shape can increase the welding area to help ensure a stable connection and relieve stress caused by thermal expansion. However, it is not limited thereto.

[0167] The positive current collector plate (61) according to the second embodiment of the present invention may include a pair of slits (65) arranged spaced apart from each other and provided inside a plurality of tab coupling portions (64), and a fusing bridge (200) provided between the pair of slits (65).

[0168] The fusing bridge (200) can form a path (p) for current flowing from the jelly roll (11) to the rivet (13) and can be configured to be short-circuited by a current greater than a predetermined value flowing along the fusing bridge (200). That is, the fusing bridge (200) can correspond to a safety device that can melt and break when an overcurrent flows through the positive current collector plate (61). The fusing bridge (200) can perform the function of a bridge located between a pair of slits (65).

[0169] The fusing bridge (200) may form part of the rivet joint (63). However, it is not limited thereto, and the rivet joint (63) may overlap with the area of ​​the fusing bridge (200) and a pair of slits (65), and the rivet joint (63) may be provided at the center of the positive current collector plate (61) and separated between the fusing bridge (200) and a pair of slits (65).

[0170] A pair of slits (65) according to a second embodiment of the present invention may be arranged parallel to each other. A pair of slits (65) may be arranged to be spaced apart from each other and facing each other parallel to each other. However, they are not limited thereto.

[0171] Each of the pair of slits (65) may have a roughly straight bar shape. However, it is not limited thereto.

[0172] The fusing bridge (200) may include a pair of fusing bridges (200) each provided at one end and the other end of a pair of slits (65). The fusing bridge (200) according to the second embodiment of the present invention may be composed of two fusing bridges (200), including a pair of fusing bridges (200).

[0173] A pair of fusing bridges (200) may be spaced apart so as to face each other with respect to the center of the positive current collector plate (61). Each of the pair of fusing bridges (200) may form a rectangular area. Each of the pair of fusing bridges (200) may form a rectangular area. However, it is not limited thereto.

[0174] Among the plurality of tap joints (64), the first tap joint (64a) positioned adjacent to the rivet joint (63) can be configured to be approximately parallel to a pair of slits (65). Accordingly, the first path (p1) of the current flowing from the first tap joint (64a) to the rivet joint (63) can be configured to pass through the fusing bridge (200) in an approximately straight direction.

[0175] That is, the first path (p1) may be the shortest path from the first tab joint (64a) toward the center of the rivet joint (63).

[0176] According to the second embodiment of the present invention, the positive current collector plate (61) can form the shortest distance for the first path (p1) of current flowing from the first tab coupling part (64a) to the rivet coupling part (63) through the fusing bridge (200), and the first path (p1) can form a straight line without bending or detouring. Accordingly, according to the physical law (R∝l) that electrical resistance is proportional to the length of the path, it can perform the decisive function of minimizing the DC internal resistance (DCIR) of the cylindrical battery cell (10) including the positive current collector plate (61).

[0177] The positive current collector plate (61) according to the second embodiment of the present invention can balance the resistance (R) and fusing performance of the fusing bridge (200) by optimizing the physical shape (number (N), width (w), and length (l)) of the fusing bridge (200). The resistance (R) of the fusing bridge (200) may be proportional to the resistivity (ρ) and length (l), and inversely proportional to the width (w), thickness (t), and number (N).

[0178] Here, since the resistivity (ρ) and thickness (t) of the fusing bridge (200) may not change as constants, the resistance (R) and fusing performance of the fusing bridge (200) can be optimized by modifying the physical shape including the number (N), width (w), and length (l) of the fusing bridge (200).

[0179] The fusing bridge (200) according to the second embodiment of the present invention can reduce the number (N) of the fusing bridge (200) from the usual 4 to 2, widen the width (w), and reduce the length (l).

[0180] That is, the fusing bridge (200) according to the second embodiment of the present invention can have a small number and form a wide bridge area. If the number (N) of the fusing bridge (200) is reduced, the resistance (R) of the fusing bridge (200) may increase, but if the width (w) is widened, the resistance (R) of the fusing bridge (200) may decrease.

[0181] Accordingly, the fusing bridge (200) according to the second embodiment of the present invention can maximize the performance of the cylindrical battery cell (10) by reducing the DC internal resistance (DCIR) of the cylindrical battery cell (10) including the positive current collector plate (61) by modifying the physical shape including the number (N), width (w), and length (l) to maintain the resistance (R) value of the fusing bridge (200) required for fusing and simplifying the structure of the fusing bridge (200) so as to shorten the path (p) of the current flowing from the tap joint (54) to the rivet joint (53).

[0182] That is, the battery (2) according to the second embodiment of the present invention can maximize the performance of the cylindrical battery cell (10) by reducing the DC internal resistance (DCIR) of the cylindrical battery cell (10) while minimizing changes in the fusing time of the fusing bridge (200).

[0183] According to the second embodiment of the present invention, the width (w) of the fusing bridge (200) may be greater than the length (l) of the fusing bridge (200). The width (w) of the fusing bridge (200) may be 3.0 mm to 6.0 mm. Preferably, the width (w) of the fusing bridge (200) may be 5.5 mm or more. More preferably, the width (w) of the fusing bridge (200) may be 5.5 mm. However, it is not limited thereto.

[0184] The length (l) of the fusing bridge (200) may be 2.0 mm to 5.0 mm. Preferably, the length (l) of the fusing bridge (200) may be 4.4 mm or more. More preferably, the length (l) of the fusing bridge (200) may be 4.4 mm. However, it is not limited thereto.

[0185] Accordingly, the DC internal resistance (DCIR) of the cylindrical battery cell (10) including the fusing bridge (200) according to the second embodiment of the present invention may be 2.3 mΩ or less. Preferably, the DC internal resistance (DCIR) of the cylindrical battery cell (10) may be approximately 2.2 mΩ. However, it is not limited thereto.

[0186] That is, when the length of the fusing bridge (200) is 4.4 mm and the width (w) of the fusing bridge (200) is 5.5 mm, the DC internal resistance (DCIR) of the cylindrical battery cell (10) can be 2.2 mΩ.

[0187] That is, the width of the fusing bridge (200) according to the second embodiment of the present invention may be greater than or equal to the width of the first tap coupling part (54a) adjacent to the fusing bridge (200) among the plurality of tap coupling parts (54). Accordingly, the total current flowing along the first tap coupling part (54a) can pass through the fusing bridge (200) along a straight path in the shortest path.

[0188] Accordingly, in a cylindrical battery cell (10) including a fusing bridge (200) according to the second embodiment of the present invention, the number (N) of the fusing bridge (200) is reduced, but the resistance (R) of the fusing bridge (200) applied to the fusing bridge (200) can be maintained, and by shortening the path (p) of the current flowing from the tab coupling part (54) to the rivet coupling part (53), the performance can be maximized by lowering the DC internal resistance (DCIR) of the cylindrical battery cell (10) while performing the fusing function of the fusing bridge (200).

[0189] FIG. 6 is a drawing illustrating a battery pack in a battery according to a first embodiment of the present invention. FIG. 7 is a drawing illustrating a vehicle equipped with a battery according to a first embodiment of the present invention.

[0190] Referring to FIGS. 6 and 7, the battery (1) according to the present invention may include a plurality of cylindrical battery cells (10) and may include a battery pack (2000) formed by accommodating the plurality of cylindrical battery cells (10) in a pack case (2100). The battery pack (2000) may additionally include various control and protection systems such as a Battery Management System (BMS).

[0191] The battery pack (2000) can be applied to various devices. Specifically, it can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, or to an Energy Storage System (ESS), but is not limited to these and can be applied to various devices that can use secondary batteries.

[0192] In an electric vehicle (V), the wheel is driven by a motor that receives power from a battery pack (2000) formed by a battery (1) according to the present invention, so that the electric vehicle can be operated.

[0193] Although the technical concept of the present invention has been explained above through specific embodiments, the scope of the present invention is not limited to these embodiments.

[0194] Various embodiments that can be modified or varied by a person skilled in the art, within the scope of not departing from the gist of the technical concept of the present invention as specified in the patent claims, shall also be deemed to fall within the scope of the rights of the present invention.

Claims

1. A battery comprising a jelly roll in which a positive electrode, a negative electrode, and a separator are wound in one direction, A can configured to accommodate the above jelly roll; A rivet electrically connected to the jelly roll and configured to pass through one side of the can; and A positive current collector plate further comprising: a rivet coupling portion disposed between the jelly roll and the rivet and coupled to the rivet, and a plurality of tab coupling portions provided radially outside the rivet coupling portion to be coupled to the jelly roll; The above positive current collector plate is, A pair of slits provided on the inner side of the plurality of tab coupling parts and spaced apart to face each other, and A battery further comprising a fusing bridge that forms part of the rivet joint between the pair of slits and forms a path for current flowing from the jelly roll to the rivet.

2. In Paragraph 1, The fusing bridge is configured to be short-circuited by a current greater than a predetermined value flowing along the fusing bridge, and A battery in which the width of the fusing bridge is greater than the length of the fusing bridge.

3. In Paragraph 1, The above pair of slits are arranged parallel to each other in a battery.

4. In Paragraph 1, A battery in which each of the above pair of slits comprises a main slit having an arc shape and a sub-slit extending along a straight direction from both ends of the main slit.

5. In Paragraph 1, The above fusing bridge is a battery comprising a pair of fusing bridges each provided at one end and the other end of the pair of slits.

6. In Paragraph 1, A battery in which a first tab joint portion among the plurality of tab joint portions, positioned adjacent to the rivet joint portion, is configured approximately parallel to the pair of slits.

7. In Paragraph 6, A battery configured such that the first path of current flowing from the first tab joint to the rivet joint passes through the fusing bridge in an approximately straight direction.

8. In Paragraph 7, The above first path is a battery that is the shortest path from the first tab joint to the center of the rivet joint.

9. In Paragraph 1, A battery in which the width of the fusing bridge is 3.0 mm to 6.0 mm.

10. In Paragraph 1, A battery in which the width of the fusing bridge is 5.5 mm or less.

11. In Paragraph 1, A battery in which the length of the fusing bridge is 2.0 mm to 5.0 mm.

12. In Paragraph 1, A battery in which the length of the fusing bridge above is 3 mm or more.

13. In Paragraph 1, The above battery includes cylindrical battery cells, and A battery in which the DC internal resistance of the above-mentioned cylindrical battery cell is 2.3 mΩ or less.

14. An automobile comprising the battery described in claim 1.

15. A positive electrode current collector plate disposed between a jelly roll in which a positive electrode, a negative electrode, and a separator are wound in one direction and a rivet electrically connected to the jelly roll, wherein A rivet joint portion joined to the above rivet; A plurality of tab coupling parts provided on the radially outer side of the rivet coupling part to be coupled with the jelly roll above; A pair of slits provided on the inner side of the plurality of tab coupling parts and spaced apart to face each other; and An anode current collector plate comprising: a fusing bridge that forms part of the rivet joint between the pair of slits and forms a path for current flowing from the jelly roll to the rivet.

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