CN116848724A

CN116848724A - Battery, current collecting plate applied to battery, battery pack comprising battery and vehicle

Info

Publication number: CN116848724A
Application number: CN202280014727.8A
Authority: CN
Inventors: 崔修智; 皇甫光洙; 闵建宇; 赵敏起; 金度均
Original assignee: LG Energy Solution Ltd
Current assignee: LG Energy Solution Ltd
Priority date: 2021-10-14
Filing date: 2022-07-19
Publication date: 2023-10-03

Abstract

A battery according to an embodiment of the present invention includes: an electrode assembly having a first electrode tab and a second electrode tab defined by an uncoated portion; a battery case that receives the electrode assembly and is electrically connected to the second electrode tab; a cover plate configured to seal an opening of the battery case; a current collecting plate having an edge portion, a tab coupling portion extending inward from the edge portion and coupled to the first electrode tab, and a terminal coupling portion positioned to be spaced apart from the tab coupling portion; and a terminal coupled to the terminal coupling portion.

Description

Battery, current collecting plate applied to battery, battery pack comprising battery and vehicle

Technical Field

The present disclosure relates to a battery, a current collector plate (current collector plate) applied to the battery, and a battery pack and a vehicle including the battery. More particularly, the present disclosure relates to a battery having a structure for preventing concentration of force at a welded portion between components when external impact or vibration is applied during use, a current collecting plate applied to the battery, and a battery pack and a vehicle including the battery.

The present application claims priority from korean patent application No. 10-2021-013001 filed on 10 months 14 of 2021, korean patent application No.10-2021-0178999 filed on 12 months 14 of 2021 and korean patent application No.10-2021-0194611 filed on 31 of 2021, the disclosures of which are incorporated herein by reference.

Background

Rechargeable batteries have a wide range of applications. For example, a battery pack (battery pack) applied to a device such as an electric vehicle requires high capacity and high output. A battery pack having a high capacity and a high output may include a plurality of batteries.

A battery having high capacity and high output characteristics has electrode tabs on both end surfaces of a jelly roll (jellyroll) to improve current collection efficiency, and a current collecting plate may be coupled to each of both end surfaces of the jelly roll. This structure can maximize the contact area of the electrode tab and the current collecting plate and minimize the resistance at the connection portion of the assembly.

As described above, when the battery is applied to, for example, a device such as a vehicle, external impact and vibration may be frequently applied during use, resulting in damage to the coupling portion for electrical connection between the components. The damaged coupling portion causes a product defect.

Alternatively, even if the electrical connection is not completely disconnected by the coupling portion for electrical connection being damaged, when a portion of the welded portion is damaged and the coupling area between the components is reduced, the increased resistance may cause excessive heat generation or deformation of the components, resulting in internal short circuits.

Accordingly, there is a need to develop a battery having a structure for preventing concentration of force at a coupling portion between components when external impact and/or vibration is applied during use.

There is a conventional flexible current collecting plate having a flat plate shape deformed in the axial direction of the battery. However, whenever the plate-shaped current collecting plate is deformed in the axial direction, a torsional stress is applied to the joint (welded) portion of the current collecting plate, resulting in disconnection at the contact point of the current collecting plate.

Disclosure of Invention

Technical problem

The present disclosure is directed to solving the above-described problems, and therefore, the present disclosure is directed to providing a battery for dissipating external impact and/or vibration without concentrating at a specific location when the impact and/or vibration is applied during use, thereby preventing damage from occurring at a coupling portion between components.

The present disclosure also aims to provide a current collector plate having a structure that keeps it flat and provides flexibility in the axial and radial directions, thereby eliminating the risk of torsional stresses at the contact points when deformation occurs.

The present disclosure is also directed to providing a current collecting plate that can perform a current blocking function without additional installation of a current blocking member to rapidly block current when overcurrent occurs due to a short circuit, thereby securing safety of a battery during use.

The objects of the present disclosure are not limited to the above-mentioned objects, and these and other objects and advantages of the present disclosure can be understood by the following description, and will be more clearly understood by the embodiments of the present disclosure. Additionally, it is apparent that the objects and advantages of the present disclosure can be achieved by the means set forth in the appended claims, and combinations thereof.

Technical proposal

The present disclosure provides a current collecting plate disposed between a first electrode tab and an exposed terminal of an electrode assembly for electrical connection of the first electrode tab and the terminal.

The current collecting plate includes: an edge portion extending in a circumferential direction; a joint coupling portion extending from the edge portion in a centripetal direction and coupled to the first electrode joint; a terminal coupling portion that is provided at a centripetal position with respect to the edge portion and is connected to the joint coupling portion through the edge portion while avoiding the joint coupling portion.

Among the terminal coupling portion, the edge portion, and the joint coupling portion, the edge portion may be disposed at an outermost centrifugal position, and the terminal coupling portion may be disposed at an innermost centrifugal position.

The center of the terminal coupling portion may substantially match the center of the edge portion.

The rim portion may have a rim shape with a hollow center.

The rim portion may have a substantially circular flat annular shape.

A plurality of joint coupling portions may be arranged along the circumferential direction of the edge portion.

The extension length of each of the plurality of joint coupling parts may correspond to each other.

The plurality of joint coupling portions may be arranged at equal intervals along the circumferential direction of the edge portion.

The joint coupling portion may extend from the inner periphery of the edge portion in the centripetal direction.

Based on an imaginary line connecting connection portions of two joint coupling portions adjacent in the circumferential direction and the edge portion in a straight line shape, the edge portion between the two adjacent joint coupling portions may be further disposed at a position more eccentric than the imaginary line.

The terminal coupling portion may be connected to the edge portion located between two joint coupling portions adjacent in the circumferential direction.

The terminal coupling portion may be disposed at or near the center of the centripetal region with respect to the edge portion, and the edge portion and the terminal coupling portion may be connected by a connection portion.

The connection portion may extend further outward in the radial direction than the joint coupling portion.

The terminal coupling portion may be surrounded by the plurality of tab coupling portions.

The plurality of joint coupling portions may be spaced apart from the terminal coupling portion in the radial direction, and may be radially arranged around the terminal coupling portion.

The connection portion may linearly extend in a straight shape to connect the terminal coupling portion to the edge portion.

The connection part may have a straight shape passing through the center of the current collecting plate.

The connection portion may extend from the terminal coupling portion in the radial direction and be connected to the edge portion.

The connecting portion may extend in the radial direction substantially from a center of the terminal coupling portion and be connected to the edge portion.

A plurality of connection parts may be provided, and the plurality of connection parts may be arranged at equal intervals along an outer circumference of the terminal coupling part.

The plurality of connection portions may be arranged at equal intervals along the circumferential direction of the edge portion.

The connecting portion may be disposed between a pair of joint coupling portions adjacent in the circumferential direction.

The distance from the connecting portion to any one of the pair of joint coupling portions in the circumferential direction may correspond to the distance from the connecting portion to the other of the pair of joint coupling portions in the circumferential direction.

The conductive paths from the terminal coupling portion to the tab coupling portion may be in the order of the terminal coupling portion, the connection portion, the edge portion, and the tab coupling portion.

At least a portion of the connection portion in the extending direction may have a smaller width than the joint coupling portion.

The connection portion may include a tapered portion that gradually decreases in width in a direction from an inner peripheral surface of the edge portion toward the terminal coupling portion.

The connection portion may include a notch portion in an extending direction of the connection portion, the cross-sectional area of the notch portion being locally reduced.

The notch portion may be provided closer to the edge portion than to the terminal coupling portion.

The portion of the terminal coupling portion facing the terminal coupling portion may have a tapered shape facing the terminal coupling portion.

The current collector plate may have a radially symmetrical structure.

The current collecting plate may have a radially symmetrical structure through 90 °, 120 ° or 180 °.

The current collector plate may be used in a battery.

The battery including the current collecting plate may include an electrode assembly and a battery case accommodating the electrode assembly.

The electrode assembly may include first and second electrodes, and a separator interposed between the first and second electrodes, the first and second electrodes and the separator being wound together around a winding axis to define a core and an outer circumferential surface, wherein the first and second electrodes have first and second electrode tabs formed of first and second uncoated portions, respectively, at long-side ends along a winding direction, and the first and second electrode tabs protrude from the separator in opposite directions along the winding axial direction.

The battery may include terminals mounted to be insulated from the battery case and exposed to the outside of the battery case.

The current collecting plate may include: an edge portion defining a space therein; a joint coupling portion extending from the edge portion in a centripetal direction and coupled to the first electrode joint; a terminal coupling portion disposed at a centripetal position with respect to the edge portion; and a connecting portion that connects the terminal coupling portion to the edge portion while avoiding the joint coupling portion.

The first electrode tab may be coupled to the tab coupling portion of the current collecting plate, and the terminal may be coupled to the terminal coupling portion of the current collecting plate.

The first electrode tab may be separated by a slit groove along the winding direction, and may include a plurality of segments protruding from the separator in the winding axial direction.

The plurality of segments may be arranged to overlap in a radial direction of the electrode assembly so as to form a plurality of segment alignments spaced apart from each other in the circumferential direction.

The segments included in each segment alignment body may be curved along the radial direction to form a curved surface area.

The joint coupling portion of the current collecting plate may be coupled to the curved surface region, and the connection portion may be positioned between the segment alignments spaced apart from each other in the circumferential direction.

The connection part may include a notch part having a reduced cross-sectional area in an extending direction thereof, and the notch part may be spaced apart from an exposed end surface between the segment aligners of the electrode assembly spaced apart from each other in the circumferential direction.

The exposed end surfaces of the electrode assembly between the segment aligners spaced apart from each other in the circumferential direction may be electrolyte impregnated portions.

In the electrolyte impregnating portion, an end portion of the first electrode and an end portion of the second electrode in the winding axial direction may be exposed between separators of adjacent convolutions.

The battery case may have a closed portion at one side in the axial direction and an opening portion at the other side.

The electrode assembly including the first electrode tab and the second electrode tab may be inserted through the opening portion.

The first electrode tab and the second electrode tab of the electrode assembly may be positioned at one side and the other side in the axial direction, respectively.

The first electrode tab may face the closed portion and the second electrode tab may face the opening portion when the electrode assembly is received in the battery case.

The terminal may be provided at the closing portion.

The terminal may pass through the closure.

The second electrode tab may be electrically connected to the battery case.

The terminal coupling portion of the current collecting plate may be disposed at a position corresponding to a hole at a winding center of the electrode assembly.

The end of the first electrode tab may be bent in the radial direction.

The first electrode tab may be curved in a centripetal or centrifugal direction.

The tab coupling portion of the current collecting plate may be coupled to a surface of the bent first electrode tab.

The connection portion may face and contact a surface of the curved first electrode tab.

The edge portion may face and contact a surface of the curved first electrode tab.

The opening of the battery case may be closed by a cap plate.

The cap plate may not be electrically connected to the first electrode tab and the second electrode tab of the electrode assembly. Thus, the cover plate may be non-polar.

An insulator may be positioned between the enclosure and the current collector plate.

The terminal may be coupled to the terminal coupling portion of the current collecting plate through the insulator.

The battery pack may include a plurality of batteries and a battery pack case accommodating the batteries.

The battery pack may be mounted in a vehicle.

Technical effects

According to aspects of the present disclosure, external impact and/or vibration can be dissipated without being concentrated at a specific location when impact and/or vibration is applied during use of the battery, thereby preventing damage from occurring at the coupling portion between the components.

Meanwhile, according to another aspect of the present disclosure, the current collecting plate itself may perform a current blocking function without additionally installing a current blocking member to rapidly block current when overcurrent occurs due to a short circuit, thereby securing safety of the battery during use.

Additionally, according to another aspect of the present disclosure, since the connection path from the terminal coupling portion to the tab coupling portion of the current collecting plate starts from the terminal coupling portion, passes through the connection portion extending more outwardly in the radial direction than the tab coupling portion and the edge portion extending in the circumferential direction, and returns to the tab coupling portion extending inward in the radial direction, the shape of the current collecting plate covers the entire electrode tab of the electrode assembly to flexibly cope with impact and vibration and prevent the current collecting plate from moving up and down, keeps the current collecting plate pressing down the electrode tab of the electrode assembly, thereby preventing deformation of the electrode tab due to deformation of the current collecting plate.

Additionally, according to the present disclosure, even if the terminal coupling portion and the joint coupling portion relatively receive an external force or external vibration in an axial direction or a radial direction, since the connection portion linearly extends in the radial direction, it is possible to prevent torsional stress from acting on the coupling portions of the terminal coupling portion and the joint coupling portion, thereby preventing separation at the coupling portions.

However, technical effects that can be obtained by the present disclosure are not limited to the above-described effects, and these and other effects will be clearly understood by those of ordinary skill in the art from the following description.

These and other effects of the present disclosure will be described in conjunction with the detailed description of the embodiments of the present disclosure.

Drawings

Fig. 1 is a perspective view illustrating a battery and a bus bar for electrical connection of a plurality of batteries according to an embodiment of the present disclosure.

Fig. 2 is a sectional view illustrating an upper structure of a battery according to an embodiment of the present disclosure.

Fig. 3 is a partial sectional view illustrating a battery according to an embodiment of the present disclosure.

Fig. 4 is a view illustrating an electrode assembly and a current collecting plate (first current collecting plate) of the present disclosure coupled to each other.

Fig. 5 to 8 are diagrams illustrating various shapes of a current collecting plate (first current collecting plate) according to an embodiment of the present disclosure.

Fig. 9 and 10 are diagrams illustrating various shapes of a current collecting plate (first current collecting plate) according to another embodiment of the present disclosure.

Fig. 11 is a partial sectional view illustrating a lower structure of a battery according to an embodiment of the present disclosure.

Fig. 12 is a view showing a lower surface of a battery according to an embodiment of the present disclosure.

Fig. 13 is an exemplary plan view illustrating an electrode structure including a plurality of segments to form a plurality of segment alignments along a circumferential direction of an electrode assembly.

Fig. 14 is a top view of an electrode assembly manufactured by winding a positive electrode and a negative electrode having the electrode structure shown in fig. 13 together with a separator.

Fig. 15 is a partial perspective view illustrating an upper portion of the electrode assembly.

Fig. 16 is a partial cross-sectional view taken along line A-A' of fig. 14.

Fig. 17 is a diagram illustrating a process of coupling a current collecting plate to an electrode assembly using a curved surface region formed by bending a segment included in a segment alignment body toward a core of the electrode assembly according to an embodiment of the present disclosure.

Fig. 18a and 18b are top views illustrating current collecting plates welded to an electrode assembly according to an embodiment of the present disclosure.

Fig. 19a is a plan view illustrating an electrode structure according to another embodiment of the present disclosure.

Fig. 19b is a top view illustrating a curved surface region formed by bending a segment included in a segment alignment body according to another embodiment of the present disclosure.

Fig. 20 is a schematic diagram illustrating a battery pack according to an embodiment of the present disclosure.

Fig. 21 is a diagram illustrating a vehicle according to an embodiment of the present disclosure.

Detailed Description

The above objects, features and advantages will be described in detail with reference to the accompanying drawings, and thus, technical aspects of the present disclosure will be readily practiced by those of ordinary skill in the art. In describing the present disclosure, a detailed description of related known techniques is omitted when it is determined that the detailed description may unnecessarily obscure the subject matter of the present disclosure. Hereinafter, exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar elements.

The terms "first," "second," and the like are used to describe various elements and these elements are not limited by these terms. These terms are used to distinguish one element from another element and a first element may be a second element unless the context clearly indicates otherwise.

In the specification, each element may be in the singular or the plural unless the context clearly indicates otherwise.

In the following, it will be understood that an element is referred to as being "above (or below)" or "on (or below)" another element, which may be on the upper surface (or lower surface) of the other element, and intervening elements may be present between the element and the other element on (or below) the element.

Additionally, it will be further understood that when an element is referred to as being "connected to," "coupled to," or "coupled to" another element, it can be directly connected or coupled to the other element or intervening elements may be present or each element may be "connected," "coupled," or "coupled" to each other by the other element.

As used herein, the singular forms also include the plural unless the context clearly indicates otherwise. It will be understood that the terms "comprises" or "comprising," when used in this specification, specify the presence of stated elements or steps, but do not preclude the presence or addition of one or more other elements or steps.

Additionally, as used herein, the singular forms also include the plural unless the context clearly indicates otherwise. It will be understood that the terms "comprises" or "comprising," when used in this specification, specify the presence of stated elements or steps, but do not preclude the presence or addition of one or more other elements or steps.

In the specification, "a and/or B" represents one or both of a or B, and "C to D" represents C or more and D or less, unless the context clearly indicates otherwise.

In describing the following embodiments, the height direction in which the battery extends is referred to as a height direction or an axial direction Z, and the direction around the axial direction is referred to as a circumferential direction. Here, in the height direction of the battery, the direction in which the opening is formed is referred to as a downward direction, and the direction in which the closing portion is formed is referred to as an upward direction.

Further, a direction extending in the radial direction from the center of the battery is referred to as a radial direction X, Y, and a direction toward the outside in the radial direction is referred to as a centrifugal direction, and a direction toward the inside in the radial direction is referred to as a centripetal direction.

Referring to fig. 1 to 4, a battery 1 according to the present disclosure includes an electrode assembly 10 and a cylindrical battery case 20 accommodating the electrode assembly 10.

The battery case 20 has a closed portion on the top (one end in the axial direction) and an opening portion on the bottom (the other end in the axial direction).

The terminal 50 is installed at the center of the closed portion.

The opening is closed by a cover plate 30.

The electrode assembly 10 includes a first electrode tab 11 and a second electrode tab 12.

The first electrode tab 11 is electrically connected to the terminal 50, and the second electrode tab 12 is electrically connected to the battery case 20.

The terminal 50 and the battery case 20 are insulated from each other.

The present disclosure provides a current collecting plate 40 between a first electrode tab 11 and a terminal 50 of an electrode assembly 10 to electrically connect them.

The current collecting plate 40 may be positioned between the closed portion of the battery case 20 and the electrode assembly 10.

Referring to fig. 5 to 10, the current collecting plate 40 includes: an edge portion 41 extending in the circumferential direction to define a space inside; a joint coupling portion 42, the joint coupling portion 42 extending from the edge portion 41 in the centripetal direction and being coupled to the first electrode joint 11; and a terminal coupling portion 43 provided at a centripetal position with respect to the edge portion 41, spaced apart from the joint coupling portion 42, and connected to the joint coupling portion 42 through the edge portion 41.

Among the terminal coupling portion 43, the edge portion 41, and the tab coupling portion 42, the edge portion 41 may be disposed at an outermost centrifugal position, and the terminal coupling portion 43 may be disposed at an innermost centripetal position.

The rim portion 41 may have a rim shape having a central hollow portion.

The edge portion 41 may have a substantially circular flat annular shape.

The plurality of joint coupling portions 42 may be arranged along the circumferential direction of the edge portion 41.

The extension length of each of the plurality of joint coupling parts 42 may correspond to each other.

The plurality of joint coupling portions 42 may be arranged at equal intervals along the circumferential direction of the edge portion 41.

The joint coupling portion 42 may extend in a centripetal direction from an inner peripheral edge of the edge portion 41.

The portion of the tab coupling portion 42 facing the terminal coupling portion 43 may have a tapered shape toward the terminal coupling portion 43. The tapered shape increases the opening area of the current collector plate 40 by reducing the unnecessary area of the joint coupling portion 42.

Based on an imaginary line (see a broken line in fig. 8) connecting the connection portions of the two joint coupling portions 42 adjacent in the circumferential direction and the edge portion 41 in a straight line shape, the edge portion 41 (see a two-dot chain line in fig. 8) between the adjacent two joint coupling portions 42 may be disposed at a position more eccentric than the imaginary line (see a broken line in fig. 8).

The terminal coupling portion 43 may be connected to the edge portion 41 between two joint coupling portions 42 adjacent in the circumferential direction.

The terminal coupling portion 43 may be disposed at or near the center of the centripetal region with respect to the edge portion 41, and the edge portion 41 and the terminal coupling portion 43 may be connected by a connection portion 44.

The connecting portion 44 may extend further outward in the radial direction than an imaginary line (see a broken line in fig. 8) connecting the connecting portions of the two joint coupling portions 42 adjacent in the circumferential direction and the edge portion 41 in a straight line shape (see a one-dot chain line in fig. 8).

The terminal coupling portion 43 may be surrounded by a plurality of tab coupling portions 42.

The plurality of joint coupling parts 42 may be spaced apart from the terminal coupling part 43 in a radial direction, and may be radially arranged around the terminal coupling part 43.

The connection portion 44 may linearly extend in a straight shape to connect the terminal coupling portion 43 to the edge portion 41.

The connection part 44 may have a straight shape passing through the center of the current collecting plate 40.

The connection portion 44 may extend from the terminal coupling portion 43 in the radial direction and be connected to the edge portion 41.

The connection portion 44 may extend in the radial direction substantially from the center of the terminal coupling portion 43 and be connected to the edge portion 41.

A plurality of connection portions 44 may be provided, and the plurality of connection portions 44 may be arranged at equal intervals along the outer circumference of the terminal coupling portion 43.

The plurality of connection portions 44 may be arranged at equal intervals along the circumferential direction of the edge portion 41.

The connection portion 44 may be disposed between a pair of joint coupling portions 42 adjacent to each other in the circumferential direction.

The connection portion 44 extends through a space between the edge portion 41 and the terminal coupling portion 43 to electrically connect the edge portion 41 to the terminal coupling portion 43 while avoiding the joint coupling portion 42.

The distance in the circumferential direction from the connection portion 44 to any one of the pair of joint coupling portions 42 may correspond to the distance in the circumferential direction from the connection portion 44 to the other one of the pair of joint coupling portions 42.

The current collecting plate 40 may have a radially symmetrical structure. A radially symmetrical structure refers to a symmetrical structure in which the shape of the object matches when the object for measuring symmetry is rotated at a predetermined angle. Preferably, the current collecting plate 40 may have a radially symmetrical structure through 90 °, 120 ° or 180 °. In one example, the structures may match when the current collector plate 40 is rotated 90 °. However, the present disclosure is not limited by the rotation angle of the radially symmetric structure.

The conductive paths from the terminal coupling portion 43 to the tab coupling portion 42 may be in the order of the terminal coupling portion 43, the connection portion 44, the edge portion 41, and the tab coupling portion 42.

At least a portion along the extending direction of the connection portion 44 may have a smaller width than the joint coupling portion 42.

When the terminal coupling portion 43 is forced in the radial direction and/or the axial direction with respect to the joint coupling portion 42, the edge portion 41 and/or the connecting portion 44 between two adjacent joint coupling portions 42 may absorb force as it is deformed. In this case, torsional stress does not occur at the coupling portion of the terminal coupling portion 43 and the joint coupling portion 42.

The connection portion 44 may include a tapered portion 44a, the tapered portion 44a gradually decreasing in width in a direction from the inner peripheral surface of the edge portion 41 toward the terminal coupling portion 43.

Referring to fig. 9 and 10, the connection portion 44 may include a notch portion N having a partially reduced cross-sectional area along the extension direction.

The notch portion N may be provided closer to the edge portion 41 than to the terminal coupling portion 43.

Referring back to fig. 1 to 4, a current collecting plate 40 may be used for the battery 1.

The battery 1 including the current collecting plate 40 may include a battery case 20 accommodating the electrode assembly 10.

The battery case 20 may have a closed portion at one side in the axial direction and an opening portion at the other side.

The electrode assembly 10 including the first electrode tab 11 and the second electrode tab 12 may be inserted through the opening portion.

The first electrode tab 11 and the second electrode tab 12 of the electrode assembly 10 may be positioned at one side and the other side in the axial direction, respectively.

When the electrode assembly 10 is received in the battery case 20, the first electrode tab 11 may face the closed portion, and the second electrode tab 12 may face the open portion.

The terminal 50 may be provided at the closed portion.

Terminal 50 may pass through the enclosure.

The first electrode tab 11 may be electrically connected to the terminal 50.

The first electrode tab 11 and the terminal 50 may be electrically connected through the current collecting plate 40.

The first electrode tab 11 may be coupled to the tab coupling portion 42 of the current collecting plate 40, and the terminal 50 may be coupled to the terminal coupling portion 43 of the current collecting plate 40.

The second electrode tab 12 may be electrically connected to the battery case 20.

The terminal coupling parts 43 of the current collecting plate 40 may be disposed at positions corresponding to the holes at the winding center C of the electrode assembly 10.

As shown in fig. 4, the end of the first electrode tab 11 may be bent in the radial direction.

The first electrode tab 11 may be bent in a centripetal or centrifugal direction.

The tab coupling portion 42 of the current collecting plate 40 may be coupled to the surface of the bent first electrode tab 11.

The connection part 44 may face and contact the surface of the bent first electrode tab 11.

The edge portion 41 may face and contact the surface of the curved first electrode tab 11.

The opening of the battery case 20 may be closed by a cap plate 30.

The cap plate 30 may not be electrically connected to the first electrode tab 11 and the second electrode tab 12 of the electrode assembly 10. Thus, the cover plate 30 may be nonpolar.

The insulator 60 may be positioned between the closure and the current collector plate 40.

The terminal 50 may be coupled to the terminal coupling portion 43 of the current collecting plate 40 through the insulator 60.

As shown in fig. 20, the battery pack 3 may include a plurality of batteries 1 and a battery pack case (pack housing) 2 accommodating the batteries 1.

In addition, as shown in fig. 21, the battery pack 3 may be mounted in the vehicle 5.

Referring back to fig. 1 and 2, the battery 1 according to the embodiment of the present disclosure includes an electrode assembly 10, a battery case 20, a cap plate 30, a current collector (first current collector) 40, and a terminal 50. In addition to the above-described components, the battery 1 may further include a sealing gasket G1 and/or an insulating gasket G2 and/or an insulating member 60 and/or a second current collecting plate 70.

The electrode assembly 10 includes a first electrode having a first polarity, a second electrode having a second polarity, and a separator between the first electrode and the second electrode. The first electrode corresponds to a positive electrode or a negative electrode, and the second electrode corresponds to an electrode having an opposite polarity to the first electrode.

The electrode assembly 10 may have, for example, a jelly roll shape. That is, the electrode assembly 10 may be prepared by winding a stack formed by sequentially stacking a first electrode, a separator, and a second electrode at least once around a winding center C. In this case, an additional separator may be present on the outer circumferential surface of the electrode assembly 10 for insulation from the battery case 20.

The first electrode includes a first electrode current collector and a first electrode active material layer coated on one or both surfaces of the first electrode current collector. The first electrode current collector has an uncoated portion that is not coated with the first electrode active material at one end in the width direction (parallel to the Z axis). The uncoated portion serves as the first electrode tab 11. The first electrode tab 11 is positioned at an upper portion in the height direction (parallel to the Z axis) of the electrode assembly 10 received in the battery case 20.

The second electrode includes a second electrode current collector and a second electrode active material layer coated on one or both surfaces of the second electrode current collector. The second electrode current collector has an uncoated portion not coated with the second electrode active material at the other end in the width direction (parallel to the Z axis). The uncoated portion serves as the second electrode tab 12. The second electrode tab 12 is positioned at a lower portion in the height direction (parallel to the Z axis) of the electrode assembly 10 received in the battery case 20.

That is, the first electrode tab 11 and the second electrode tab 12 extend in opposite directions along the width direction of the electrode assembly 10, i.e., the height direction (parallel to the Z-axis) of the battery 1. The first electrode tab 11 extends toward the closed portion of the battery case 20, and the second electrode tab 12 extends toward the open portion of the battery case 20.

In the present disclosure, the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate may include any type of active material known in the art.

In one example, the positive electrode active material may include an alkali metal compound represented by the following formula: AA [ A ] _x M _y ]O _2+z (A comprises at least one of Li, na or K; M comprises at least one selected from Ni, co, mn, ca, mg, al, ti, si, fe, mo, V, zr, zn, cu, al, mo, sc, zr, ru and Cr; x.gtoreq.0, 1.ltoreq.x+y.ltoreq.2; 0.1.ltoreq.z.ltoreq.2; the stoichiometric coefficients x, y and z are chosen such that the compound remains electrically neutral).

In another example, the positive electrode active material may be an alkali metal compound xLiM disclosed by US6,677,082 and US6,680,143 ¹ O ₂ -(1-x)Li ₂ M ² O ₃ (M ¹ Comprising at least one element having an average trivalent oxidation state; m is M ² Comprising at least one element having an average tetravalent oxidation state; x is more than or equal to 0 and less than or equal to 1).

In yet another example, the positive electrode active material may be a lithium metal phosphate represented by the following formula: li (Li) _a M ¹ _x Fe _1- _x M ² _y P _1-y M ³ _z O _4-z (M ¹ Comprises at least one selected from Ti, si, mn, co, fe, V, cr, mo, ni, nd, al, mg and Al; m is M ² Comprises at least one selected from Ti, si, mn, co, fe, V, cr, mo, ni, nd, al, mg, al, as, sb, si, ge, V and S; m is M ³ Comprising a halogen element optionally containing F; 0<a≤2，0≤x≤1，0≤y<1，0≤z<1, a step of; the stoichiometric coefficients a, x, y and z are chosen to keep the compound electrically neutral) or Li ₃ M ₂ (PO ₄ ) ₃ [ M comprises at least one selected from Ti, si, mn, fe, co, V, cr, mo, ni, al, mg and Al]。

Preferably, the positive electrode active material may include primary particles and/or secondary particles formed by agglomeration of the primary particles.

In one example, the anode active material may include a carbon material, lithium metal or lithium metal compound, silicon or silicon compound, tin or tin compound. Such as TiO ₂ And SnO ₂ And the like having a potential of less than 2VThe oxide may be used for the anode active material. The carbon material may include low crystalline carbon, high crystalline carbon, and the like.

The separator may include, for example, a porous polymer film made of a polyolefin-based polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, and an ethylene/methacrylate copolymer, used alone or in a stack. In another example, the separator may include a general porous non-woven fabric, for example, a non-woven fabric made of high-melting glass fiber and polyethylene terephthalate fiber.

The separator may include a coating layer of inorganic particles on at least one surface. Additionally, the separator itself may be formed of a coating layer of inorganic particles. The particles forming the coating layer may be joined with an adhesive (binder) such that interstitial volumes exist between adjacent particles.

The inorganic particles may include an inorganic substance having a dielectric constant of 5 or more. Non-limiting examples of inorganic particles may include those selected from Pb (Zr, ti) O ₃ (PZT)、Pb _1-x La _x Zr _1-y Ti _y O ₃ (PLZT)、PB(Mg ₃ Nb _2/3 )O ₃ -PbTiO ₃ (PMN-PT)、BaTiO ₃ Hafnium oxide (HfO) ₂ )、SrTiO ₃ 、TiO ₂ 、Al ₂ O ₃ 、ZrO ₂ 、SnO ₂ 、CeO ₂ MgO, caO, znO and Y ₂ O ₃ At least one material of the group consisting of.

The electrolyte may be of the type having a ⁺ B ^- Is a salt of the structure of (a). Here, A ⁺ Including for example Li ⁺ 、Na ⁺ 、K ⁺ Such as alkali metal cations or combinations thereof. B-includes a material selected from 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 ^- Sum (CF) ₃ CF ₂ SO ₂ ) ₂ N ^- At least one anion of the group consisting of.

The electrolyte may be used by being dissolved in an organic solvent. The organic solvent may include at least one of Propylene Carbonate (PC), ethylene Carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethylmethyl carbonate (EMC), or γ -butyrolactone.

The battery case 20 is an approximately cylindrical container having an opening portion at the bottom, and is made of, for example, a material having conductivity such as metal. The material of the battery case 20 may be, for example, aluminum. The battery case 20 has an opening portion at a lower end portion of the height and a closing portion at an upper end portion. The battery case 20 accommodates the electrode assembly 10 through an opening portion at the bottom and also accommodates an electrolyte.

The battery case 20 is electrically connected to the electrode assembly 10. For example, the battery case 20 is electrically connected to the second electrode tab 12 of the electrode assembly 10. Accordingly, the battery case 20 may have the same polarity as the second electrode tab 12.

Referring to fig. 2 and 11, the battery case 20 may include a crimping portion (crimping portion) 21 and a crimping portion (crimping portion) 22 at a lower end portion. The beading part 21 is disposed under the electrode assembly 10. The beading part 21 is formed by pressing the outer peripheral surface of the battery case 20 in a centripetal direction. The beading part 21 may prevent the electrode assembly 10 having a size approximately corresponding to the width of the battery case 20 from sliding through the opening part of the battery case 20 at the bottom, and may serve as a support on which the cap plate 30 is seated.

The beading portion 22 is provided below the hemming portion 21. The bead portion 22 extends and is bent to surround a portion of the lower surface of the cover plate 30 and the outer peripheral surface of the cover plate 30 under the bead portion 21.

However, the present disclosure does not exclude that the battery case 20 does not include the bead portion 21 and/or the bead portion 22. In the present disclosure, when the battery case 20 does not include the beading part 21 and/or the beading part 22, the fixing of the electrode assembly 10 and/or the fixing of the cap plate 30 and/or the sealing of the battery case 20 may be accomplished, for example, by additional applications of components that may act as stoppers for the electrode assembly 10 and/or additional applications of structures on which the cap plate 30 may be seated and/or welding between the battery case 20 and the cap plate 30.

The region of the closed portion of the battery case 20 forming the upper surface may have a thickness in the range from about 0.5mm to 1.0mm, and more preferably, a thickness in the range from about 0.6mm to 0.8 mm. The side wall of the battery case 20 forming the outer peripheral surface may have a thickness in the range from about 0.3mm to 0.8mm, and more preferably, a thickness in the range from about 0.40mm to 0.60 mm. According to an embodiment of the present disclosure, the battery case 20 may have a plating layer. In this case, the plating layer may include nickel (Ni), for example. The thickness of the plating layer may be in the range from about 1.5 μm to 6.0 μm.

As the thickness of the battery case 20 is smaller, the internal space is larger, and thus the battery 1 having improved energy density and high capacity can be manufactured. In contrast, as the thickness increases, propagation of flame to an adjacent cell can be prevented in an explosion test, thereby improving safety.

As the thickness of the plating layer is smaller, it is more susceptible to corrosion, and as the thickness of the plating layer is larger, the complexity of the manufacturing process may increase or there is a higher possibility that delamination of the plating layer may occur. In view of these conditions, it is necessary to set the optimal thickness of the battery case 20 and the optimal thickness of the plating layer. Further, in view of all these conditions, it is necessary to control each of the thickness of the closed portion and the thickness of the side wall of the battery case 20.

Referring to fig. 2 and 11, the cover plate 30 may be made of, for example, metal to ensure strength. The cover plate 30 closes the opening of the battery case 20 at the bottom. That is, the cap plate 30 forms the lower surface of the battery 1. In the battery 1 of the present disclosure, the cap plate 30 may be nonpolar even when it is made of a conductive metal. The non-polar cap plate 30 may mean that the cap plate 30 is electrically insulated from the battery case 20 and the terminals 40. The cover plate 30 may be non-polar and the material need not be a conductive metal.

When the battery case 20 of the present disclosure includes a beading part, the cap plate 30 may be seated on the beading part 21 of the battery case 20. In addition, when the battery case 20 of the present disclosure includes the beading part 22, the cap plate 30 is fixed by the beading part 22. A sealing gasket G1 may be interposed between the cap plate 30 and the beading part 22 of the battery case 20 to ensure sealability of the battery case 20. Meanwhile, as described above, the battery case 20 of the present disclosure may not include the beading part 21 and/or the beading part 22, and in this case, the sealing gasket G1 may be interposed between the cap plate 30 and the fixing structure at the opening part of the battery case 20 to secure sealability of the battery case 20.

Referring to fig. 11 and 12, the cap plate 30 may further include a vent portion 31 to prevent the internal pressure from rising above a preset pressure due to the gas generated in the battery case 20. The exhaust portion 31 corresponds to a region of the cover plate 30 having a smaller thickness than other regions. The exhaust portion 31 is structurally weaker than any other region. Therefore, when the internal pressure of the battery case 20 rises above a preset level due to abnormality of the battery 1, the exhaust portion 31 breaks to force the gas generated in the battery case 20 to be exhausted. For example, the exhaust part 31 may be formed by grooving on either or both surfaces of the cap plate 30 to partially reduce the thickness of the battery case 20.

The battery 1 according to the embodiment of the present disclosure has a structure in which both the positive terminal and the negative terminal are present at the upper portion as described below, and thus the upper structure is more complex than the lower structure. Therefore, the exhaust portion 31 may be formed in the cap plate 30 forming the lower surface of the battery 1 for smooth discharge of the gas generated in the battery case 20. As shown in fig. 11, the lower end of the cap plate 30 is preferably disposed higher than the lower end of the battery case 20. In this case, even when the lower end of the battery case 20 contacts the ground or the bottom surface of the case for forming the module or the battery pack, the cap plate 30 does not contact the ground or the bottom surface of the case for forming the module or the battery pack. Therefore, it is possible to prevent a phenomenon in which the pressure required for rupture of the vent portion 31 is different from the design pressure due to the weight of the battery 1, thereby allowing smooth rupture of the vent portion 31.

Meanwhile, when the exhaust part 31 has a closed annular shape as shown in fig. 11 and 12, the exhaust part 31 may be more easily broken as the distance from the center of the cap plate 30 to the exhaust part 31 is greater. When the same exhaust pressure is applied, as the distance from the center of the cover plate 30 to the exhaust portion 31 is longer, a larger force acts on the exhaust portion 31, and the exhaust portion 31 is more likely to break. In addition, as the distance from the center of the cover plate 30 to the exhaust portion 31 is longer, more smooth exhaust of the exhaust gas can be achieved. From this point of view, the exhaust portion 31 may be preferably formed along the edge of an approximately flat region extending downward (in the downward direction based on fig. 11) from the edge region of the cover plate 30.

Although fig. 12 shows the exhaust portion 31 continuously formed in an approximately circular shape on the cover plate 30, the present disclosure is not limited thereto. The exhaust portion 31 may be discontinuously formed in an approximately circular shape on the cover plate 30, and may be formed in an approximately linear shape or any other shape.

Referring to fig. 2 to 4, a current collecting plate (first current collecting plate) 40 is coupled to the electrode assembly 10. The current collecting plate 40 is made of metal having conductivity and is connected to the first electrode tab 11.

Referring to fig. 4, the current collecting plate 40 may be coupled to a coupling surface formed by bending an end portion of the first electrode tab 11 in a direction parallel to the current collecting plate 40. The bending direction of the first electrode tab 11 may be, for example, a direction toward the winding center C of the electrode assembly 10. When the first electrode tab 11 is bent in this way, the space occupied by the first electrode tab 11 can be reduced, thereby improving energy density. Additionally, the coupling area between the first electrode tab 11 and the current collecting plate 40 can be increased, thereby achieving improved bonding strength and reduced resistance.

Referring to fig. 5 to 8 and 2 to 4, the current collector 40 includes an edge portion 41, a tab coupling portion 42, and a terminal coupling portion 43. The edge portion 41 may have a shape of an approximate rim having an empty space S at the center. Although the drawings of the present disclosure show the edge portion 41 having an approximately circular rim shape, the present disclosure is not limited thereto. The rim portion 41 may have an approximately square rim shape or any other shape.

The edge portion 41 may be provided at the outermost side in the radial direction. One embodiment shows the edge portion 41 having a closed annular shape with no discontinuities along the circumferential direction. This structure can firmly support the strength of the entire current collecting plate 40 to prevent the welded portions of the joint coupling portion 42 and the terminal coupling portion 43, which will be described later, from being subjected to a shearing force (in particular, a shearing force acting in a direction parallel to a plane including the current collecting plate).

However, the edge portion 41 need not have a closed annular shape, and may have a closed annular shape as a whole (even if there is at least one cutout).

The tab coupling portion 62 extends inward from the edge portion 41 and is coupled to the first electrode tab 11. The terminal coupling portion 43 is provided inside the edge portion 41, spaced apart from the joint coupling portion 42. The terminal coupling portion 43 may be coupled to the terminal 50 as described below by welding. The terminal coupling portion 43 may be provided at the center of the space inside the edge portion 41, for example. The terminal coupling parts 43 may be disposed at positions corresponding to the holes at the winding center C of the electrode assembly 10.

The tab coupling portion 42 and the terminal coupling portion 43 are spaced apart from each other without direct connection, and they are electrically connected through the edge portion 41. As described above, the current collecting plate 40 according to the embodiment of the present disclosure has the following structure: in this structure, the tab coupling portion 42 and the terminal coupling portion 43 are not directly connected to each other and they are connected by the edge portion 41 provided at the outermost centrifugal position in the radial direction, so that when an impact and/or vibration occurs in the battery 1, the impact applied to the coupling portion between the tab coupling portion 42 and the first electrode tab 11 and the coupling portion between the terminal coupling portion 43 and the terminal 50 can be dissipated. Accordingly, the current collecting plate 40 of the present disclosure may minimize or prevent damage to the welded portion due to external impact. The current collecting plate 40 of the present disclosure has the following structure: in this structure, when an external impact is applied, pressure can be concentrated on the connection portion of the edge portion 41 and the terminal coupling portion 43, and since the welding portion for coupling between components is not formed in the connection portion, it is possible to avoid product defects caused by damage to the welding portion due to the external impact.

The current collecting plate 40 may further include a connection portion 44, the connection portion 44 extending inward from the edge portion 41 and being connected to the terminal coupling portion 43. At least a portion of the connection portion 44 may have a smaller width than the joint coupling portion 42. In this case, when the resistance at the connection portion 44 rises and a current flows through the connection portion 44, a higher resistance occurs, and thus when an overcurrent occurs, a portion of the connection portion 44 breaks to block the overcurrent. The width of the connection portion 44 may be adjusted to an appropriate level in consideration of the overcurrent blocking function.

The connection portion 44 may include a tapered portion 44a, the tapered portion 44a gradually decreasing in width in a direction from the inner surface of the edge portion 41 toward the terminal coupling portion 43. With this tapered portion 44a, the strength of the assembly at the connecting portion of the connecting portion 44 and the edge portion 41 can be improved. Furthermore, the tapered portion 44a may serve as an area covering the bent electrode tab.

There may be a plurality of joint couplings 42. The plurality of joint coupling portions 42 may be arranged at equal intervals along the extending direction of the edge portion 41. The extension length of each of the plurality of joint coupling portions 42 may be equal. The terminal coupling portion 43 may be surrounded by a plurality of tab coupling portions 42. The connection portion 44 may be disposed between a pair of adjacent joint coupling portions 42. In this case, the distance along the extending direction of the edge portion 41 from the connection portion 44 to any one of the pair of joint coupling portions 42 may be equal to the distance along the extending direction of the edge portion 41 from the connection portion 44 to the other one of the pair of joint coupling portions 42.

There may be a plurality of connections 44. Each of the plurality of connection portions 44 may be positioned between a pair of adjacent joint coupling portions 42. The plurality of connection portions 44 may be arranged at equal intervals along the extending direction of the edge portion 41.

As described above, in the case where the plurality of joint coupling portions 42 and/or the plurality of connection portions 44 are provided, when the distance between the joint coupling portions 42 and/or the distance between the connection portions 44 and/or the distance between the joint coupling portions 42 and the connection portions 44 is constant, the flow of electric current from the joint coupling portions 42 to the connection portions 44 or the flow of electric current from the connection portions 44 to the joint coupling portions 42 can be smoothly formed.

The connection portion 44 may extend in a radial direction from the center of the current collecting plate 40, and may extend linearly. Therefore, it is possible to reduce the conductive distance, and even when a compressive force or a tensile force is applied to any one of the connection parts 44 in the extending direction, it is possible to prevent any change in the shape of the connection part 44 and prevent deformation of the overall shape of the current collecting plate 40. Accordingly, it is possible to prevent the current collecting plate 40 from moving too much, thereby preventing the first electrode tab 11 compressed by the current collecting plate 40 from moving or deforming due to the movement of the current collecting plate 4.

Further, since the plurality of connection portions 44 having a straight shape are connected by the terminal coupling portion 43, when the connection portion 44 on any one side of the terminal coupling portion 43 receives an external force, the connection portion 44 connected to the other side plays a role of supporting it. Further, even if the joint coupling portion 44 and the terminal coupling portion 43 of the current collecting plate 40 are forced in different axial directions, torsional stress does not occur at the joint coupling portion 44 and the terminal coupling portion 43, thereby protecting the welded portion.

The limited portions of the current collecting plate 40 connected to other components by welding are a terminal coupling portion 43 and a joint coupling portion 44. Additionally, they are connected by an edge portion 41. The terminal coupling portion 43 is provided at the center in the radial direction, the edge portion 41 is provided at the edge in the radial direction, and the joint coupling portion 44 is provided between the center and the edge in the radial direction.

Therefore, when the terminal coupling portion 43 is forced in the radial direction or the axial direction with respect to the joint coupling portion 44, the connecting portion 44 having a linear shape can transmit force to the edge portion 41, and the edge portion 41 extending in the circumferential direction can cope with external force when it is flexibly deformed.

Referring to fig. 9 and 10, the connection portion 44 may include a notch portion N having a partial reduction in a sectional area along an extending direction of the connection portion 44. The reduction in cross-sectional area may be achieved by reducing the width and/or thickness of the connection 44. With the notched portion N, since the resistance increases at the region having the notched portion N, it is possible to quickly block the current when the overcurrent occurs.

When the connection portion 44 includes the tapered portion 44a, the notch portion N may be provided closer to the tapered portion 44a than to the terminal coupling portion 43. In this case, due to the structure of the edge portion 44a whose width is gradually reduced, when the notch portion N is provided at the region adjacent to the high heat generation region, the overcurrent can be blocked more quickly.

Referring to fig. 1 to 3 and 5, the terminal 50 is made of metal having conductivity and is coupled to the terminal coupling portion 43 of the current collecting plate (first current collecting plate) 40. The terminal 50 may pass through a closed portion of the battery case 20 opposite to the opening portion. When the battery 1 of the present disclosure includes the insulator 60, the terminal 50 is coupled to the terminal coupling portion 43 of the current collecting plate 40 through the insulator 60.

The terminal 50 is electrically connected to the first electrode tab 11 of the electrode assembly 10 through the current collecting plate 40, and thus has a first polarity. Thus, the terminal 50 may serve as a first electrode terminal of the battery 1 of the present disclosure. Additionally, in the battery 1 of the present disclosure, the approximately flat surface of the closed portion of the battery case 20 having the second polarity may serve as the second electrode terminal 20a. Referring to fig. 1, a bus bar B is connected to each of the first electrode terminal 50 and the second electrode terminal 20a of the battery 1 of the present disclosure. In each of the first electrode terminal 50 and the second electrode terminal 20a, in order to secure a sufficient coupling region with the bus bar B, the width D1 of the region of the first electrode terminal 50 exposed through the battery case 20 may be set to a range of about 10% to 60% of the width D2 of the second electrode terminal 20a (i.e., the upper surface of the battery case 20).

When the terminal 50 has a first polarity, the terminal 50 is electrically insulated from the battery case 20 having a second polarity. Insulation between the terminals 50 and the battery case 20 may be achieved by various methods. For example, insulation may be achieved by placing an insulating gasket G2 between the terminal 50 and the battery case 20. The insulating gasket G2 may be made of, for example, a resin material having insulating properties.

Alternatively, insulation may be achieved by forming an insulating coating at a portion of the terminal 50. Alternatively, the terminal 50 may be structurally firmly fixed to prevent contact between the terminal 50 and the battery case 20. Alternatively, two or more of the above methods may be applied together.

Referring to fig. 2 and 3 and fig. 5, an insulator 60 may be disposed between the current collecting plate (first current collecting plate) 40 and the inner surface of the battery case 20. The insulator 60 prevents contact between the current collecting plate 40 and the battery case 20. The insulator 60 may be positioned between the upper end of the outer circumferential surface of the electrode assembly 10 and the inner surface of the battery case 20. This aims at preventing contact between the first electrode tab 11 extending toward the closed portion of the battery case 20 and the inner peripheral surface of the battery case 20.

When the battery 1 of the present disclosure includes the insulator 60, the terminal 50 is coupled to the current collecting plate 40 through the insulator 60. In order to pass the terminal 50, the insulator 60 may have an opening at a position corresponding to the terminal coupling portion 43 of the current collecting plate 40.

Referring to fig. 11, a current collecting plate (second current collecting plate) 70 is coupled to a lower portion of the electrode assembly 10. The current collecting plate 70 is made of metal having conductivity and is coupled to the second electrode tab 12. Additionally, the current collecting plate 70 is electrically connected to the battery case 20. The edge region of the current collecting plate 70 may be fixed between the inner surface of the battery case 20 and the sealing gasket G1. In this case, the current collecting plate 70 may be welded to the seating surface formed by the beading portion 21 of the battery case 20.

Referring to fig. 4, the current collecting plate 70 may be coupled to a coupling surface formed by bending an end portion of the second electrode tab 12 in a direction parallel to the current collecting plate 70. The bending direction of the second electrode tab 12 may be, for example, a direction toward the winding center C of the electrode assembly 10. When the second electrode tab 12 is bent in this way, the space occupied by the second electrode tab 12 can be reduced, thereby improving the energy density. Additionally, it is possible to improve the bonding strength between the second electrode tab 12 and the current collecting plate 70 and reduce the resistance.

Meanwhile, in the present disclosure, each of the first electrode tab 11 and the second electrode tab 12 may have a plurality of segments (segments) that are separated from each other by slit grooves regularly formed in an uncoated portion along a winding direction of the electrode. The plurality of segments may be exposed to the outside of the diaphragm along the winding axial direction. The plurality of segments are arranged to overlap along a radial direction of the electrode assembly to form a plurality of segment pairs Ji Ti (segment alignment) that are separated in a circumferential direction. Additionally, the segments included in each segment alignment body may be curved in a radial direction to form a curved surface area.

In one embodiment, the joint coupling portions 42 of the current collecting plates 40 may be coupled to the curved surface regions of the segment alignment bodies, and the connection portions 44 of the current collecting plates 40 may be positioned between the segment alignment bodies spaced apart from each other in the circumferential direction.

Referring to fig. 13, an electrode 80 of an embodiment includes a sheet-shaped current collector 81 and an active material layer 82. The current collector 81 may include a metal foil. The metal foil may be a metal having conductivity, for example, aluminum or copper. The current collector 81 may be appropriately selected according to the polarity of the electrode 80. The metal foil may be replaced by a metal mesh (mesh). The metal foil may have a structure in which metal films are coated on both surfaces of a substrate of an insulating film. An active material layer 82 is formed on at least one surface of the current collector 81. The active material layer 82 is formed along the winding direction X. The electrode 80 includes an uncoated portion 83 at a long-side end in the winding direction X. The uncoated portion 83 is a portion of the current collector 81 that is not coated with the active material. In the electrode 80, the region of the current collector 81 having the active material layer 82 may be referred to as an active material portion.

In the electrode 80, the width of the current collector 81 in the direction along the short side may be 60mm to 70mm, and the length of the current collector 81 in the direction along the long side may be 3m to 5m. Accordingly, the ratio of the short side to the long side of the electrode 80 may be 1.2% to 2.3%. This ratio is much less than the ratio of short side to long side of the electrode used in cylindrical cells with a form factor of 1865 or 2170 by 6% to 11%.

Preferably, the insulating coating 84 may be formed at the boundary of the active material layer 82 and the uncoated portion 83. At least a portion of the insulating coating 84 overlaps the boundary of the active material layer 82 and the uncoated portion 83. The insulating coating 84 prevents a short circuit between two electrodes having opposite polarities and having a separator interposed therebetween. The insulating coating 84 has a width of 0.3mm to 5mm to cover the boundary of the active material layer 82 and the uncoated portion 83. The insulating coating 84 comprises a polymer resin and may include, for example, al ₂ O ₃ Or SiO ₂ And the like. Since a portion of the current collector 81 is covered by the insulating coating 84 without being coated with the active material layer, it may be regarded as an uncoated portion.

The uncoated portion 83 includes a first portion B1 near the core, a second portion B3 near the outer periphery, and a third portion B2 between the first portion B1 and the second portion B3. When the electrode 80 is wound as an electrode assembly, the core and the outer peripheral edge indicate the central region and the outer peripheral edge surface of the electrode assembly, respectively.

Of the first, second and third portions B1, B3 and B2, the third portion B2 has the longest length and occupies a substantial part of the length of the electrode 80. The first portion B1 may form a plurality of winding turns (winding turns) near the core of the electrode assembly. The second portion B3 may form at least one convolution near the outer periphery of the electrode assembly.

The third portion B2 comprises a plurality of segments 85. The plurality of segments 85 are for electrical connection to the current collecting plate 40, thus corresponding to the first electrode tab 11. Preferably, the segment 85 may have a rectangular shape. Alternatively, the segments 85 may have a trapezoidal shape, a parallelogram shape, or a semicircular shape. Various modifications may be made to the geometry of segment 85.

The plurality of segments 85 may be slotted by a laser. Alternatively, the segments 85 may be formed by known metal foil cutting processes (e.g., ultrasonic cutting or stamping). In the winding direction X, the distance (pitch) between the segments 85 may increase as it goes from the core to the outer periphery.

The cutout groove 86 is positioned between adjacent segments 85 in the winding direction X. A kerf slot 86 is formed in the slotting process of the segment 85. The cutout groove 86 includes a flat bottom 86a, a circular arc portion 86b adjacent to the flat bottom 86a, and a side portion 86c of the segment 85. Here, the arc portion 86c may relieve stress when the segment 85 is bent, thereby preventing breakage at the lower end portion of the segment 85.

In order to prevent damage to the active material layer 82 and/or the insulating coating 84 when bending the segment 85, it is desirable to form a predetermined gap between the bottom 86a of the cutout groove 86 and the active material layer 82. This is because when the segment 85 is bent, stress is concentrated on or near the bottom 86a of the cutout groove 86. The gap is 0.2mm to 4mm, and preferably 1.5mm to 2.5mm. When the gap is adjusted to correspond to the numerical range, damage to the active material layer 82 and/or the insulating coating 84 caused by stress in the vicinity of the lower end portion of the cutout groove 86 can be prevented when the segment 85 is bent. Additionally, the gap may prevent damage to the active material layer 82 and/or the insulating coating 84 caused by tolerances in the slotting or cutting process of the segment 85. The lower end of the kerf slots 86 and the insulating coating 84 may be separated by 0.5mm to 1.0mm. When the electrode 80 is wound, the end of the insulating coating 84 in the winding axis direction Y may be disposed in a range of-2 mm to 2mm in the winding axis direction based on the end of the separator. The insulating coating 84 may prevent a short circuit between two electrodes having opposite polarities and having a separator interposed therebetween, and support the position where the segment 85 is bent. To improve the short circuit prevention effect between the two electrodes, the insulating coating 84 may be exposed to the outside of the separator. Additionally, in order to maximize the short circuit prevention effect between the two electrodes, the insulating coating 84 may be increased in width to position the end of the insulating coating 84 in the winding axis direction Y at a position higher than the bottom 86a of the slit groove 86. In one embodiment, the end of the insulating coating 84 in the winding axial direction may be set in a range of-1 mm to +1mm based on the bottom 86a of the cutout groove 86.

Fig. 14 is a top view of an electrode assembly JR manufactured by winding a positive electrode and a negative electrode having the structure of the electrode 80 shown in fig. 13 together with a separator, fig. 15 is a partial perspective view showing an upper portion of the electrode assembly JR, and fig. 16 is a partial sectional view taken along a line A-A' of fig. 14. The upper portion of the electrode assembly JR shown in the drawings is the positive electrode side.

Referring to fig. 14 to 16, a plurality of segments 85 protrude from the separator and protrude in the winding axis direction Y. Additionally, a plurality of segments 85 are radially arranged about the core C of the electrode assembly JR to form a segment alignment body 90. Segment alignments 90 refer to assemblies of segments 85 arranged such that segments 85 at different convolutions overlap in the radial direction of electrode assembly JR.

The plurality of segments 85 included in the segment alignment body 90 overlap each other in the radial direction, which means that when a predetermined straight line is drawn from the center of the core C through the segment alignment body 90, all the segments 85 intersect with the corresponding straight line.

The segment alignment body 90 extends to a predetermined length in the radial direction of the electrode assembly JR, and in the segment alignment body 90, the segments 85 of the adjacent convolution turns in the radial direction may overlap in terms of a circumferential angle measured based on the center of the core.

The number of segment alignments 90 may be 4, 3, or 2, and the number of segment alignments 90 is not limited thereto. The plurality of segment aligners 90 may be arranged at equal intervals in the circumferential direction. The segment aligners 90 may be arranged at unequal intervals in the circumferential direction.

When the number of segment alignments 90 is 4, the angle between adjacent segment alignments 90 in the circumferential direction may be about 90 °. When the number of segment alignments 90 is 3, the angle between adjacent segment alignments 90 in the circumferential direction may be about 120 °. When the number of segment alignments 90 is 2, the angle between adjacent segment alignments 90 in the circumferential direction may be about 180 °.

The angle θ between adjacent segment alignments 90 in the circumferential direction is defined as the angle between the side extension line of one segment alignment 90 and the side extension line of another segment alignment 90 closest to the one segment alignment 90 when the electrode assembly JR is viewed from the winding axis direction Y. When an imaginary line (see a one-dot chain line) passing through the center of the segment alignment body 90 from the center of the core C of the electrode assembly JR is drawn, the angle θ is substantially the same as that of an adjacent imaginary line in the circumferential direction.

As the pitch of the segments 85 adjacent to each other in the winding direction X increases from the core to the outer circumference in the winding direction X of the electrode assembly JR, but may be determined according to a preset rule to form the segment alignment body 90 in the radial direction of the electrode assembly JR. The pitch of the segments 85 corresponds substantially to the width of the slit grooves 86 in the winding direction.

The electrolyte impregnated portion (electrolyte impregnation portion) 100 is formed between the segment alignment bodies 90 of the electrode assemblies JR adjacent in the circumferential direction. The electrolyte impregnating part 100 is formed by winding the uncoated portion 83 having the slit groove 86.

As shown in fig. 16, the electrolyte impregnated portion 100 is a region where the electrolyte EL can be mainly impregnated, and the height of the electrolyte impregnated portion 100 is lower than the height of the segment alignment body 90 in the winding axis direction Y. The electrolyte impregnating part 100 does not have any segment 85 protruding from the separator Se. Additionally, in the electrolyte impregnating portion 90, between the separators Se adjacent to each other in the radial direction of the electrode assembly JR, the end portion of the active material layer a1 of the positive electrode E1 and the end portion of the active material layer a2 of the negative electrode E2 are spaced apart more downward than the end portion of the separator Se by a predetermined distance. Accordingly, insulation between the positive electrode E1 and the negative electrode E2 can be maintained. In one embodiment, the predetermined distance may be 0.6mm to 1mm. The insulating coating 84 may be formed in at least one of the end portion of the positive electrode E1 and the end portion of the negative electrode E2. The end portion of the positive electrode E1 may include a slip portion in which the thickness of the active material layer a1 gradually decreases. The arrangement of the electrode and the separator shown in fig. 16 may be applied to the lower portion of the electrode assembly JR. Preferably, at the lower portion of the electrode assembly JR, an insulating coating 84 and a slip-off portion may be formed at the end of the negative electrode E2.

The electrolyte EL may be impregnated into the electrode assembly JR while being in direct contact with the positive electrode E1 and the negative electrode E2 through a gap between ends of the separator Se. Specifically, the electrolyte EL loaded on the electrode assembly JR contacts both the end of the positive electrode E1 and the end of the negative electrode E2 and the end of the separator Se, and rapidly permeates into the electrode assembly JR. Thus, electrolyte wettability (rate and uniformity) can be significantly improved.

Preferably, the height H of the segments 85 may be substantially identical in the radial direction of the electrode assembly JR. In one example, the height of the segments 85 may be 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm. Alternatively, the height H of the segment 85 may be stepwise increased from the core to the outer periphery of the electrode assembly JR. In one example, the height of the segment 85 may be increased stepwise in the range of 2mm to 10mm. In one example, when the diameter of the core of the electrode assembly JR is 8mm, the height of the segment 85 may be increased by 1mm from 2mm to 10mm in a radius range of 6mm to 14 mm. When the height H of the segment 85 is stepwise increased, it is possible to increase the number of stacks of the segment 85 in the curved surface region of the segment 85, and to increase the length of the region where the number of stacks is uniform in the radial direction of the electrode assembly JR.

The width W of segment 85 is preferably substantially the same as the width of the tab junction 42 of header plate 40 or greater than the width of the tab junction 42 of header plate 40. The width W of the segment 85 may be appropriately selected, for example, in the range of 3mm to 11 mm.

Referring to fig. 13 and 16, the location 87 at which the segment 85 is bent may be set to a line passing through the bottom 86a of the cutout groove 86 or a location spaced upward from the line by a predetermined distance. When the segment 85 is bent toward the core at a predetermined distance from the lower end portion of the cutout groove 86, it is easier to arrange the segments so as to overlap in the radial direction. When the segment 85 is bent, the more outer segment based on the center of the core presses down the more inner segment. In this case, when the bent position 87 is spaced apart from the lower end portion of the cutout groove 86 by a predetermined distance, the more inner segment is pressed by the more outer segment in the winding axial direction, so that it is easier to arrange the segments 85 to overlap. The spacing of the curved locations 87 may be 3mm or less and is preferably 2mm or less.

The pitch of the segments 85 corresponds to the width of the slit grooves 86 in the winding direction X, and may be predetermined to form the segment alignment body 90 in the radial direction of the electrode assembly JR at a predetermined region when the electrode 80 is wound.

Fig. 17 is a diagram illustrating a process of coupling the current collector plate 40 to the electrode assembly JR using a curved surface area F formed by bending the segments 85 included in the segment alignment body 90 toward the core of the electrode assembly JR according to an embodiment of the present disclosure.

Referring to fig. 17, the segments 85 included in the plurality of segment alignments 90 may be bent toward the core of the electrode assembly JR to form a bent surface area F. The surface of the curved surface region F is approximately perpendicular to the winding axial direction of the electrode assembly JR. The curved surface region F corresponds to a region in which the segments 85 are stacked in multiple layers in the winding axial direction. The number of stacks of segments 85 may preferably be 10 or more. Since the curved surface region F is formed on the segment alignment body 90, the segment alignment body 90 should be understood as a structure including the curved surface region F.

Fig. 18a and 18b are top views illustrating a current collecting plate 40 according to an embodiment of the present disclosure welded to an electrode assembly JR.

Referring to fig. 18a and 18b, each tab coupling portion 42 included in the current collector plate 40 may be coupled to the curved surface region F on the corresponding segment alignment body 90 by welding.

Since the curved surface area F is flat and wider than the joint coupling 42, the joint coupling 42 can be easily mounted and welded on the curved surface area F.

The connection portion 44 is positioned on the electrolyte impregnating portion 100 between the segment alignment bodies 90 adjacent in the circumferential direction. As shown in fig. 16, in the electrolyte impregnating portion 100, the end portion of the positive electrode E1 and the end portion of the negative electrode E2 are spaced downward from the end portion of the separator Se by a predetermined distance. Therefore, the connection portion 44 may also be spaced apart from and electrically insulated from the end portions of the positive electrode E1 and the negative electrode E2.

In fig. 18a and 18b, reference numeral W indicates a welding pattern. The welding pattern W may be at least one continuous or discontinuous linear pattern along the extending direction of the joint coupling 42. The welding pattern W may be formed by laser welding. Alternatively, the welding pattern W may be formed by other known welding methods, for example, ultrasonic welding, resistance welding, or the like.

The connection portion 44 is positioned on the electrolyte impregnating portion 100 based on the winding axis direction Y. Additionally, since the position where the segment 85 is bent is spaced apart from the electrolyte infusion 100 as shown in fig. 16, there is also a predetermined gap corresponding to an empty space between the bent surface area F formed by the bending of the segment 85 and the electrolyte infusion 100.

Therefore, when the notched portion N of the connection portion 44 is disconnected due to an overcurrent, the electrical connection of the terminal coupling portion 43 and the tab coupling portion 42 can be completely disconnected through the gap.

Meanwhile, when the curved surface region F is formed over the entire surface of the end portion of the electrode assembly JR, even if the notch portion N is disconnected due to an overcurrent, the electrical connection of the terminal coupling portion 43 and the tab coupling portion 42 may be indirectly maintained through the curved surface region F.

Therefore, in terms of reliable overcurrent blocking, the curved surface region F may be partially formed at only a portion of the end of the electrode assembly JR by adjusting the pitch of the segments 85, and the connection part 44 including the notch part N may be positioned at a region where the curved surface region F is not present.

Fig. 19a is a plan view showing a structure of an electrode 80 according to another embodiment of the present disclosure, and fig. 19b is a plan view showing a structure of a segment alignment body 90 to which the structure of the electrode 80 of fig. 19a is applied on an electrode assembly of a positive electrode and a negative electrode.

Referring to fig. 19a and 19b, an electrode 80 according to another embodiment of the present disclosure has a structure in which segment groups 85g are separated by a pitch between the groups. The pitch may be gradually or stepwise increased along the winding direction X. The segment group 85g may include at least one segment 85. The segments 85 are rectangular in shape. However, modifications may be made to the shape of segment 85, for example, any other geometric shape such as a trapezoidal shape.

When the electrode assembly is wound, the segment groups 85g are arranged to overlap in the radial direction to form the segment alignment body 90. The segment alignment body 90 has an approximately fan-like shape. The segments 85 included in the segment alignment body 90 may be bent toward the core C to form a curved surface area F. In the same manner as the above-described embodiment, the joint coupling portion 42 of the current collecting plate 40 may be welded to the curved surface area F of the segment alignment body 90. Additionally, the connection portion 44 of the current collecting plate 40 may be positioned on the electrolyte impregnating portion 100 between the segment alignment bodies 90 adjacent in the circumferential direction.

The cylindrical battery to which the above-described embodiments of the present disclosure are applied may be, for example, a cylindrical battery having a ratio of a shape factor (a value obtained by dividing the diameter of the cylindrical battery by the height thereof, i.e., defined as a ratio of the diameter Φ to the height H) of greater than about 0.4.

Here, the form factor refers to a value indicating the diameter and height of the cylindrical battery. Cylindrical batteries according to embodiments of the present disclosure may be, for example, 46110, 4875, 48110, 4880, and 4680 batteries. Among the numbers indicating the form factor, the first two numbers indicate the diameter of the battery, and the remaining numbers indicate the height of the battery.

A battery according to embodiments of the present disclosure may be a battery having an approximately cylindrical shape with a diameter of about 46mm, a height of about 110mm, and a ratio of a shape factor of about 0.418.

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

A battery according to another embodiment may be a battery having an approximately cylindrical shape with a diameter of about 48mm, a height of about 110mm, and a ratio of a shape factor of about 0.436.

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

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

Conventionally, a battery having a ratio of a shape factor of about 0.4 or less is used. That is, for example, 1865 batteries and 2170 batteries are used. 1865 cells have a diameter of about 18mm, a height of about 65mm, and a ratio of about 0.277 form factor. 2170 cells have a diameter of about 21mm, a height of about 70mm and a ratio of form factor of about 0.300.

Referring to fig. 20, a battery pack 3 according to an embodiment of the present disclosure includes: a battery assembly including a plurality of batteries 1 according to an embodiment of the present disclosure electrically connected to each other; and a battery pack case 2, the battery pack case 2 accommodating a battery assembly. In the drawings, components such as bus bars for electrical connection, cooling units, and power terminals are omitted for convenience of illustration in the drawings.

Referring to fig. 21, a vehicle 5 according to an embodiment of the present disclosure 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 disclosure. The vehicle 5 includes a four-wheeled vehicle and a two-wheeled vehicle. The vehicle 5 is operated using electric power supplied from the battery pack 3 according to the embodiment of the present disclosure.

Although the present disclosure has been described above with reference to the accompanying drawings, the present disclosure is not limited to the disclosed embodiments and the accompanying drawings, and it is apparent that various modifications may be made thereto within the scope of the technical aspects of the present disclosure. Although the description of the embodiments of the present disclosure does not explicitly describe the effect of the operation of the elements of the present disclosure, it should be apparent that the foreseeable effect of the corresponding elements should be recognized.

Claims

1. A current collecting plate disposed between a first electrode tab and an exposed terminal of an electrode assembly for electrical connection of the first electrode tab and the terminal, the current collecting plate comprising:

an edge portion extending in a circumferential direction to define a space inside;

a joint coupling portion extending from the edge portion in a centripetal direction and coupled to the first electrode joint; and

a terminal coupling portion that is provided at a centripetal position with respect to the edge portion and is connected to the joint coupling portion through the edge portion while avoiding the joint coupling portion.

2. The current collecting plate according to claim 1, wherein the edge portion is disposed at an outermost centrifugal position and the terminal coupling portion is disposed at an innermost centripetal position among the terminal coupling portion, the edge portion and the tab coupling portion.

3. The current collector plate of claim 1, wherein a center of the terminal coupling portion substantially matches a center of the edge portion.

4. The current collecting plate according to claim 1, wherein a plurality of joint coupling portions are arranged along the circumferential direction of the edge portion, and

Wherein the terminal coupling portion is connected to the edge portion located between two joint coupling portions adjacent in the circumferential direction.

5. The current collecting plate according to claim 4, wherein the edge portion between two adjacent joint coupling portions is disposed at a position more eccentric than an imaginary line connecting connection portions of the two adjacent joint coupling portions and the edge portion in the circumferential direction in a straight line shape.

6. The current collecting plate according to claim 4, wherein the plurality of tab coupling portions are arranged at equal intervals along the circumferential direction of the edge portion.

7. The current collector plate according to claim 4, wherein the extension length of each of the plurality of tab coupling portions corresponds to each other.

8. The current collector plate of claim 4, wherein the terminal coupling portion is surrounded by the plurality of tab coupling portions.

9. The current collector plate of claim 4, wherein the plurality of tab coupling portions are spaced apart from the terminal coupling portion in a radial direction and are radially arranged around the terminal coupling portion.

10. The current collector plate of claim 1, wherein the edge portion has a rim shape with a hollow center.

11. The current collecting plate according to claim 1, wherein the terminal coupling portion is provided at or near a center of a centripetal region with respect to the edge portion, and

wherein the edge portion and the terminal coupling portion are connected by a connecting portion that extends through a space between the edge portion and the terminal coupling portion while avoiding the joint coupling portion.

12. The current collecting plate according to claim 11, wherein the connection portion linearly extends to connect the terminal coupling portion to the edge portion.

13. The current collecting plate according to claim 12, wherein the connecting portion extends in a radial direction substantially from a center of the terminal coupling portion and is connected to the edge portion.

14. The current collecting plate according to claim 13, wherein a plurality of connection parts are provided and are arranged at equal intervals along edges of the terminal coupling parts.

15. The current collecting plate according to claim 12, wherein a plurality of connection portions are arranged at equal intervals along the circumferential direction of the edge portion.

16. The current collector plate of claim 11, wherein at least a portion of the connection portion has a smaller width than the tab coupling portion.

17. The current collecting plate according to claim 11, wherein the connection portion includes a tapered portion that gradually decreases in width in a direction from an inner peripheral surface of the edge portion toward the terminal coupling portion.

18. The current collector plate according to claim 11, wherein the connection portion is disposed to be located between a pair of joint coupling portions adjacent in the circumferential direction.

19. The current collector plate according to claim 18, wherein a distance from the connection portion to any one of the pair of tab coupling portions in the circumferential direction corresponds to a distance from the connection portion to the other one of the pair of tab coupling portions in the circumferential direction.

20. The current collecting plate according to claim 11, wherein the connection portion includes a notched portion in an extending direction of the connection portion, a sectional area of the notched portion being locally reduced.

21. The current collecting plate according to claim 20, wherein the notched portion is disposed closer to the edge portion than to the terminal-coupling portion.

22. The current collecting plate according to claim 1, wherein a portion of the tab coupling portion facing the terminal coupling portion has a tapered shape facing the terminal coupling portion.

23. The collector plate of claim 1, wherein the collector plate has a radially symmetrical structure.

24. The collector plate of claim 23, wherein the collector plate has a radially symmetrical structure through a rotation of 90 °, 120 ° or 180 °.

25. A battery, the battery comprising:

an electrode assembly including first and second electrodes and a separator interposed between the first and second electrodes, the first and second electrodes and the separator being wound together around a winding axis to define a core and an outer peripheral surface, wherein the first and second electrodes have first and second electrode tabs formed of first and second uncoated portions, respectively, at long-side ends along a winding direction, the first and second electrode tabs protruding to the outside of the separator in opposite directions along a winding axial direction;

a battery case accommodating the electrode assembly and electrically connected to the second electrode tab;

a terminal mounted to be insulated from the battery case and exposed to the outside of the battery case; and

A current collecting plate disposed between the first electrode tab and the terminal for electrical connection of the first electrode tab and the terminal, the current collecting plate comprising: an edge portion defining a space therein; a joint coupling portion extending from the edge portion in a centripetal direction and coupled to the first electrode joint; a terminal coupling portion disposed at a centripetal position with respect to the edge portion; and a connecting portion that connects the terminal coupling portion to the edge portion while avoiding the joint coupling portion,

wherein the first electrode tab is coupled to the tab coupling portion of the current collecting plate, and the terminal is coupled to the terminal coupling portion of the current collecting plate.

26. The battery of claim 25, wherein the first electrode tab comprises a plurality of segments separated by cutout grooves along the winding direction and protruding to the outside of the separator along the winding axial direction,

wherein the plurality of segments are arranged to overlap in a radial direction of the electrode assembly to form a plurality of segment pairs Ji Ti that are spaced apart from each other in a circumferential direction,

Wherein the segments included in each segment alignment body are curved in the radial direction to form a curved surface area,

wherein the joint coupling portion of the current collecting plate is coupled to the curved surface area, and

wherein the connection is positioned between the segment alignments spaced apart from each other in the circumferential direction.

27. The battery according to claim 26, wherein the connecting portion includes a notched portion having a reduced cross-sectional area in an extending direction of the connecting portion, and

wherein the notched portion is spaced apart from an end surface of the electrode assembly that is exposed between the segment aligners spaced apart from each other in the circumferential direction.

28. The battery according to claim 27, wherein the end surface of the electrode assembly exposed between the segment alignments spaced apart from each other in the circumferential direction is an electrolyte infusion.

29. The battery according to claim 28, wherein, in the electrolyte impregnating portion, an end portion of the first electrode and an end portion of the second electrode in the winding axial direction are exposed between the separator in adjacent winding turns.

30. The battery according to claim 25, wherein the terminal coupling portion is provided at a position corresponding to a hole at a winding center of the electrode assembly.

31. The battery according to claim 25, wherein the battery case has an opening portion at one side in an axial direction and a closing portion at an opposite side in the axial direction, and

wherein the first electrode tab faces the closed portion and the second electrode tab faces the opening portion.

32. The battery according to claim 25, wherein the battery case has an opening portion at one side in an axial direction and a closing portion at an opposite side in the axial direction, and the opening portion is closed by a lid plate,

wherein a sealing gasket is interposed between the cover plate and the opening portion, and

wherein the cap plate is not connected to the first and second electrode tabs of the electrode assembly, and has no polarity.

33. The battery according to claim 25, wherein the battery case has an opening portion at one side in an axial direction and a closing portion at an opposite side in the axial direction, and

Wherein the terminal is mounted at a through hole of the closing portion, and an insulating washer is interposed between the terminal and the through hole.

34. The battery of claim 33, further comprising:

an insulator disposed between the closing portion and the current collecting plate.

35. The battery of claim 34, wherein the terminal is coupled to the terminal coupling portion of the current collector plate through the insulator.

36. A battery pack, the battery pack comprising:

the battery of claim 25; and

and a battery pack case accommodating a plurality of the batteries.

37. A vehicle comprising a battery pack according to claim 36.