The collector plate has structural stability, and the battery cell includes this collector plate.

Abstract

The invention relates to a current collector plate connected to an electrode ear located at one of the two ends of an electrode assembly in the axial direction, wherein which end is inserted into a can while facing the bottom of the can. The current collector plate comprises: an electrode connector with a side surface attached to the lid, bottom of the can or electrode tip; an electrode connector enclosing the electrode connector from the outside of the electrode connector in the radial direction and having the other surface attached to the electrode ear of the electrode assembly; elastic connectors located between the electrode connector and the electrode connector and electrically connecting the electrode connector to the electrode connector; and an opening located between adjacent elastic connectors in the circumferential direction and separating the electrode connector and the electrode connector in the radial or axial direction.

Description

A current collector plate with structural stability and a cylindrical battery cell using the same

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2023-0142672, dated October 24, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a current collector applicable to a cylindrical battery cell, and more specifically, to a current collector connected to an electrode tab provided at one of the axial ends of an electrode assembly, the end being inserted while facing the bottom of a can.

[0003] The process of manufacturing a battery cell using a cylindrical can includes the steps of deep drawing a metal sheet to form a circular bottom portion and a circular tubular side wall member connected thereto, accommodating an electrode assembly therein, and then closing the open end of the side wall member with a cap.

[0004] Referring to Fig. 1, before accommodating the electrode assembly (20) in the can (10), a current collector (30) may be joined to the axial lower portion of the electrode assembly. When inserting the electrode assembly (20) into the can (10), the current collector (30) faces the bottom surface (12) of the cylindrical can.

[0005] However, since the central portion of the current collector (30) is blocked, it blocks the hollow portion (29) of the electrode assembly (20). Accordingly, when the electrode assembly (20) is accommodated in the can (10), the current collector (30) prevents air inside the can (10) from being discharged to the outside through the hollow portion (29) of the electrode assembly (20). This phenomenon interferes with the process of inserting the electrode assembly (20) into the can (10).

[0006] Meanwhile, in order to facilitate resistance welding of the central portion of the current collector plate (30) and the can bottom (12), an electrically insulating insulator (19) is interposed between the current collector plate and the can bottom, excluding the central portion. While the insulator (19) has a predetermined thickness, the current collector plate is flat, so in order to make the current collector plate adhere to the can bottom, the current collector plate must be strongly pressed toward the can bottom with a welding electrode.

[0007] During this process, the current collector plate (30) is excessively deformed, and the welding area is pre-tensioned, making it unstable. Furthermore, vibrations or shocks generated during the use of the battery cell may affect the welding area, potentially causing the welding area to fall off or cracks to form in the current collector plate (30). This is because repeated and continuous tension and stress can cause fatigue failure.

[0008] When this phenomenon occurs, the electrical connection may be damaged, which may cause the battery cell to lose its function.

[0009] The present invention has been devised to solve the above-described problem, and the purpose of the present invention is to provide a current collecting plate structure that does not obstruct the flow of air into the hollow portion of the electrode assembly, thereby enabling a smooth electrode assembly insertion process, and a battery cell using the same.

[0010] The purpose of the present invention is to provide a current collector structure that does not cause cracks or fatigue failure even when continuous shock or vibration is applied, and a battery cell using the same.

[0011] The present invention aims to provide a current collector structure that is easily deformed during a welding process, so that the welding process proceeds smoothly and pretensioning does not occur even when welding is performed, and a battery cell using the same.

[0012] The technical objectives of the present invention are not limited to the purposes mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0013] To solve the above-described problem, the present invention can be applied to a current collector plate having one side joined to a cap, a can bottom, or an electrode terminal, and the other side joined to an electrode tab of an electrode assembly.

[0014] The above-mentioned current collector plate includes a terminal joint provided in the central portion and an electrode joint surrounding the terminal joint on the radially outer side of the terminal joint.

[0015] One side of the terminal joint is joined to the cap, can bottom, or electrode terminal. The joining may be accomplished, for example, by resistance welding. However, the joining method is not necessarily limited thereto.

[0016] The other side of the above electrode joint is joined to the electrode tab of the electrode assembly. The joining may be accomplished, for example, by laser welding. However, the joining method is not necessarily limited thereto.

[0017] Other joining methods, such as soldering or brazing, may be applied.

[0018] The above electrode joint and the terminal joint are interconnected by an elastic connecting member that is disposed between the electrode joint and the terminal joint and electrically connects them.

[0019] The elastic connecting member may surround part or all of the inner circumference of the electrode joint and / or the outer circumference of the terminal joint in the circumferential direction.

[0020] Preferably, the elastic connecting portion is provided in plurality, and the plurality of elastic connecting portions can each surround a portion of the inner circumference of the electrode joint and / or the outer circumference of the terminal joint in the circumferential direction.

[0021] Preferably, a plurality of the elastic connecting portions may be arranged spaced apart from each other in the circumferential direction.

[0022] An opening may be arranged between the elastic connecting portions adjacent to each other in the circumferential direction.

[0023] The above opening separates the electrode joint and the terminal joint radially and / or axially.

[0024] The elastic connecting portion includes at least one of: a first connecting section having a radially outer end and a radially inner end and extending laterally (outwardly) as it goes radially inward; and a second connecting section having a radially outer end and a radially inner end and extending axially (inwardly) as it goes radially inward.

[0025] The above elastic connecting portion may have one or two or more of the above first connecting sections.

[0026] The above elastic connecting portion may have one or two or more second connecting sections.

[0027] The above elastic connecting portion may include one or more of the first connecting sections and one or more of the second connecting sections.

[0028] One end of the elastic connecting portion may be connected to an electrode joint, and the other end may be connected to a terminal joint.

[0029] The above elastic connection portion can extend from the electrode joint portion toward the terminal joint portion.

[0030] In one example, the elastic connecting portion may have the first connecting section and the second connecting section alternately arranged along the extension direction. Then, a radial spring structure, an axial spring structure, or a combination thereof may be implemented.

[0031] The first and second connecting sections adjacent to each other in the extension direction of the elastic connecting section may be connected such that the radially inner end of the first connecting section and the radially outer end of the second connecting section are connected. This may implement a radial spring structure.

[0032] In addition, the first and second connecting sections adjacent to each other in the extension direction of the elastic connecting section may be connected such that the radially inner end of the second connecting section and the radially outer end of the first connecting section are connected. This allows for a longer radial spring structure.

[0033] The first and second connecting sections adjacent to each other in the extension direction of the elastic connecting section may be connected such that the radially inner end of the first connecting section and the radially inner end of the second connecting section are connected. This may implement an axial spring structure.

[0034] In addition, the first and second connecting sections adjacent to each other in the extension direction of the elastic connecting section may be connected such that the radially outer end of the second connecting section and the radially outer end of the first connecting section are connected. This allows for a longer axial spring structure to be implemented.

[0035] In another example, the elastic connecting portion may have second connecting sections and first connecting sections alternately arranged as it extends from the electrode connecting portion toward the terminal connecting portion. Then, a radial spring structure may be implemented.

[0036] The first and second connecting sections adjacent to each other in the extension direction of the elastic connecting section may be connected such that the radially inner end of the second connecting section and the radially outer end of the first connecting section are connected. This may implement a radial spring structure.

[0037] In addition, the first and second connecting sections adjacent to each other in the extension direction of the elastic connecting section may be connected such that the radially inner end of the first connecting section and the radially outer end of the second connecting section are connected. This allows for a longer radial spring structure.

[0038] In another example, the elastic connecting portion may have first connecting sections having different slopes as they extend from the electrode connecting portion toward the terminal connecting portion.

[0039] Preferably, the slopes of the different first connecting sections may become increasingly larger as they extend in the direction of extension.

[0040] Preferably, the slopes of the different first connecting sections may become smaller as they extend in the direction of extension.

[0041] Preferably, the slopes of the different first connecting sections can be repeatedly increased and decreased in the extension direction.

[0042] The above terminal joint may have a circular flat shape. However, the shape does not necessarily have to be circular. Also, the shape does not necessarily have to be a flat shape.

[0043] The terminal joint may have a flat ring shape. However, the shape need not necessarily be a flat ring shape. Furthermore, the shape need not necessarily be a closed-loop "O" shape. For example, the ring shape may be an open-loop "C" shape.

[0044] The above current collector plate can be joined to an electrode tab provided at one axial end of the electrode assembly.

[0045] The present invention provides a battery cell using the above-described current collector plate.

[0046] The above battery cell may be cylindrical.

[0047] The above battery cell includes a can having a bottom member and a side wall member, an electrode assembly accommodated in the can, and a cap covering an open end of the can while the electrode assembly is accommodated in the can.

[0048] The above battery cell further includes an electrode terminal.

[0049] The above electrode terminal may be provided on the bottom member or on the cap.

[0050] The above electrode terminal can be insulated and fixed to the floor member.

[0051] One side of the above current collector plate is joined to the cap, the bottom member of the can, or the electrode terminal, and the other side is electrically connected to an electrode tab provided on one axial side of the electrode assembly.

[0052] The current collector plate according to the present invention has an elastic connecting portion that easily deforms during the welding process, allowing the welding process to proceed smoothly and preventing pre-tensioning even during welding. Accordingly, even when vibration or shock is present, tension or stress acting on the welding area and the current collector plate portion connected thereto can be minimized.

[0053] The current collector plate according to the present invention has an elastic connection, preventing cracking or fatigue failure even when subjected to continuous shock or vibration. Consequently, it can maintain stability even with continuous, long-term use.

[0054] The current collector plate according to the present invention allows for smooth fluid flow through the opening. Accordingly, the process of inserting the electrode assembly into the can can be performed smoothly.

[0055] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0056] Figure 1 is a cross-sectional view showing a state in which an electrode assembly is inserted into a can.

[0057] Figure 2 is an exploded perspective view of the electrode assembly accommodated inside the can of Figure 1 before winding.

[0058] Fig. 3 is a perspective view of the electrode assembly of Fig. 2 in a pre-winding laminated state.

[0059] Fig. 4 is a perspective view of an assembled cylindrical jelly-roll-shaped electrode assembly by winding up the laminate of Fig. 3.

[0060] Figure 5 is a perspective view showing a state in which a first collector plate is joined to an electrode tab provided on one axial end of an electrode assembly facing the bottom of a can.

[0061] Fig. 6 is a cross-sectional view showing resistance welding of the first collector plate and the bottom of the can while the electrode assembly of Fig. 5 is inserted into the can.

[0062] Fig. 7 is a cross-sectional view showing a state in which the electrode tab provided on the axial end of the electrode assembly inserted inside the can and the cap assembly are connected to the second collector plate, and the open end of the can is sealed with the cap assembly.

[0063] Fig. 8 is a perspective view of a first embodiment of the cylindrical battery cell of Fig. 7.

[0064] Figures 9 and 10 are a perspective view and a plan view, respectively, of the first collector plate of the first embodiment illustrated in Figure 5.

[0065] Fig. 11 is a cross-sectional view taken along line .11.-.11. of Fig. 10.

[0066] Fig. 12 is a cross-sectional view taken along line .12.-.12. of Fig. 10.

[0067] Figure 13 is an enlarged view of the .13 box area of ​​Figure 11.

[0068] Figures 14 and 15 are a perspective view and an enlarged view of a second embodiment of the first collector plate.

[0069] Figures 16 and 17 are perspective views and enlarged views of a third embodiment of the first collector plate.

[0070] Figures 18 and 19 are perspective views and enlarged views of the fourth embodiment of the first collector plate.

[0071] Figures 20 and 21 are perspective views and enlarged views of the fifth embodiment of the first collector plate.

[0072] Figures 22 and 23 are perspective views and enlarged views of the sixth embodiment of the first collector plate.

[0073] Figures 24 and 25 are perspective views and enlarged views of the seventh embodiment of the first collector plate.

[0074] Figures 26 and 27 are perspective views and enlarged views of the eighth embodiment of the first collector plate.

[0075] Figures 28 and 29 are perspective views and enlarged views of the ninth embodiment of the first collector plate.

[0076] Figures 30 and 31 are perspective views and enlarged views of the 10th embodiment of the first collector plate.

[0077] Figures 32 and 33 are perspective views and enlarged views of the 11th embodiment of the first collector plate.

[0078] Figures 34 and 35 are perspective views and enlarged views of the 12th embodiment of the first collector plate.

[0079] Fig. 36 is a perspective view of a second embodiment of a cylindrical battery cell.

[0080] Figures 37 and 38 are perspective views of an electrode assembly to be accommodated within Figure 36.

[0081] Figure 39 is a cross-sectional view showing the process of accommodating the electrode assembly of Figure 37 in a can.

[0082] Fig. 40 is a cross-sectional view showing the process of welding the first collector plate and the first electrode terminal of Fig. 39.

[0083] Figure 41 is a cross-sectional view showing a state in which the electrode tab provided on the axial end of the electrode assembly inserted inside the can and the can are connected to the second collector plate, and the open end of the can is sealed with a cap assembly.

[0084] [Explanation of symbols]

[0085] 10: Can 11: Side wall member 113: Beading part 115: Crimping part 12: Bottom member, bottom surface, bottom 13: First electrode terminal (positive terminal) 14: Gasket 15: Second electrode terminal 16: Cap assembly 161: Electrode terminal 163: Vent 165: Current interrupting disk (CID) 167: Gasket 168: Insulating spacer 19: Insulator 20: Electrode assembly 21: First electrode 22: Second electrode 23: Metal foil 24: Active material layer 25: Supporting part 26: Non-coated part 27: Electrode tab (notched tab) 28: Separator 29: Hollow part 30: First current collector (bottom current collector) 31: Terminal joint 33: Electrode joint 34: Through hole 35: Elastic connection 36, 36-1, 36-2, 36-3: First connection section 37, 37-1, 37-2: Second connection section 39: Opening 40: Second collector plate (open end collector plate) 41: Inner ring 42: Hole 43: Electrode connection 44: Can connection R: Welding electrode

[0086] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention 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 components.

[0087] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0088] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0089] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0090] Additionally, when it is described that a component is "connected," "coupled," or "contacted" with another component, it should be understood that the components may be directly connected or in contact with each other, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "contacted" through another component.

[0091] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0092] Throughout the specification, when we refer to "A and / or B", this means A, B, or A and B, unless otherwise stated, and when we refer to "C to D", this means C or more and D or less, unless otherwise stated.

[0093] In describing the embodiment, the axial direction refers to the direction in which the axis forming the winding center of the jelly-roll type electrode assembly extends, the radial direction refers to the direction closer to or farther from the axis, and the circumferential direction refers to the direction surrounding the axis.

[0094] [Cylindrical Battery Cell - First Embodiment]

[0095] Referring to FIGS. 2 to 8, the cylindrical battery cell of the first embodiment includes an electrode assembly (20), a current collector (30, 40) electrically connected to the electrode assembly (20), and a can (10) that accommodates the electrode assembly (20) and the current collector (30, 40).

[0096] The above electrode assembly (20) is manufactured in the form of a jelly-roll by preparing a first electrode (21), a second electrode (22), and a separator (28) that extend in the longitudinal direction with a predetermined width as shown in FIG. 2, and then forming a laminate by stacking the first electrode (21), the separator (28), the second electrode (22), and the separator (28) in that order as shown in FIG. 3, and then winding this around a core shaft as shown in FIG. 4.

[0097] The above first electrode (21) may be an anode, and the above second electrode (22) may be a cathode. Of course, the opposite may also be the case.

[0098] The above first electrode (21) and second electrode (22) are manufactured in the form of sheets. The electrode sheet is manufactured in the form of an active material layer (24) applied to the surface of a metal foil (23). The electrode sheet has a holding portion (25) region where the active material layer (24) is applied, and a non-coated portion (26) region where the active material layer (24) is not applied. The positive electrode sheet has a non-coated portion (26) region on one side in the width direction, and the negative electrode sheet has a non-coated portion (26) region on the other side in the width direction.

[0099] The non-conductive portion (26) is exposed or protrudes in the width direction of the laminate. The non-conductive portion (26) itself functions as an electrode tab (27).

[0100] In the above-mentioned blank portion (26), notches can be formed at a predetermined interval to form flag-shaped notching tabs (27).

[0101] In the embodiment, the notching tabs (27) are exemplified as having an equilateral trapezoidal shape. However, their shapes may be various, such as a semicircle, a semi-ellipse, a triangle, a rectangle, a parallelogram, etc.

[0102] In addition, in the embodiment, a form in which the notching tabs (27) arranged along the longitudinal direction have the same width is exemplified. However, the width of the notching tabs may be gradually or stepwise widened from the core side to the outer periphery side.

[0103] In addition, in the embodiment, a form in which the height of the notching tabs (27) gradually increases from the core side to the outer circumference side is exemplified. However, the height of these notching tabs may be implemented in a form in which they are constant or gradually decrease.

[0104] In addition, in the embodiment, a structure is exemplified in which a notching tab (27) is deleted in a predetermined section of the centrifugal end of the non-conductive portion (26) and a predetermined section of the centrifugal end. However, it is of course possible that the notching tab may not be deleted in the centrifugal end of the non-conductive portion, and that the notching tab may not be deleted in the centrifugal end of the non-conductive portion.

[0105] In the jelly roll-shaped electrode assembly (20), the notched tab (27) can be bent radially and flattened as illustrated in FIG. 4. The notched tab (27) can be bent radially inward or outward. In the embodiment, a structure in which the notched tab (27) is bent radially inward is exemplified.

[0106] The above-mentioned notched tabs (27) can be bent one by one during the process of forming a jelly roll-shaped electrode assembly (20) by winding the laminate. Alternatively, the above-mentioned notched tabs (27) can be bent all at once after the laminate is wound to form a jelly roll-shaped electrode assembly.

[0107] The notching tabs (27) of the first electrode (21) and the notching tabs (27) of the second electrode (22), which are folded and overlapped in the radial direction, can provide a plane that is substantially perpendicular to the axial direction at each of the axial ends of the electrode assembly (20).

[0108] The first collector plate (30) and the second collector plate (40) can be joined to a substantially flat surface provided by bending the notched tabs (27) exposed at both axial ends of the electrode assembly (20), as shown in FIGS. 5 and 7.

[0109] In the embodiment, the first collector plate (30) is exemplified as a negative collector plate and the second collector plate (40) is a positive collector plate. However, the first collector plate (30) may be a positive collector plate and the second collector plate (40) may be a negative collector plate.

[0110] The above second collector plate (40) may be made of aluminum, and the above first collector plate (30) may be made of copper. However, the materials are not limited thereto.

[0111] The above-mentioned collector plate (30, 40) can be manufactured by punching, trimming, piercing, and bending a metal sheet.

[0112] The can (10) includes a bottom member (12), a side wall member (11) connected to the bottom member (12) and extending in the axial direction, and a cap assembly (16) covering an open end of the side wall member (11).

[0113] The above floor member (12) may have a disc shape, and the side wall member (11) may have a circular tube shape.

[0114] The above-mentioned bottom member (12) and side wall member (11) can be manufactured by forming a metal sheet with a nickel plated surface using a deep drawing process, and trimming the front end of the side wall member (11) with a punch while holding it with a blank holder. Of course, the material of the can (10) is not limited to this.

[0115] According to the first embodiment of the cylindrical battery cell, the first collector plate (30) is joined to one axial end, i.e., the bottom, of the electrode assembly (20). This joining can be achieved, for example, by irradiating the surface of the first collector plate (30) with a laser to weld the back surface of the first collector plate (30) and the electrode tab (27).

[0116] The above first collector plate (30) can be electrically connected to the electrode tab (27) of the first electrode (21) of the electrode assembly (20).

[0117] The above first collector plate (30) includes a terminal joint (31) provided in the central portion and a ring-shaped electrode joint (33) surrounding the terminal joint (31). The terminal joint (31) and the electrode joint (33) are interconnected through an elastic connecting portion (35).

[0118] Referring to FIG. 6, the first collector plate (30) faces the bottom (12) of the can (10), and the electrode assembly (20) can be accommodated in the can (10).

[0119] The first collector plate (30) is provided with a plurality of elastic connecting parts (35). The plurality of elastic connecting parts can be spaced apart from each other in the circumferential direction.

[0120] The space between two elastic connecting portions (35) adjacent in the circumferential direction constitutes an opening (39). The opening (39) connects the space below the first collector plate (30) and the hollow portion (29) of the electrode assembly (20). Accordingly, no air resistance occurs when the electrode assembly (20) is accommodated in the can (10).

[0121] An insulator (19) may be interposed between the first collector plate (30) and the bottom of the can (10). The insulator (19) prevents the electrode joint (33) of the first collector plate (30) from making direct contact with the bottom (12) of the can (10) and forming an electrical connection. Accordingly, resistance welding between the terminal joint (31) of the first collector plate (30) and the bottom (12) of the can (10) can be performed more smoothly.

[0122] The above insulator (19) may be composed of a material capable of absorbing vibration. Accordingly, even if the bottom (12) of the can (10) vibrates, the phenomenon of the vibration being directly transmitted to the electrode assembly (20) through the electrode joint (33) of the first collector plate (30) can be prevented.

[0123] With the electrode assembly (20) housed in the can (10), the welding electrode (R) can approach the back surface of the terminal joint (31) through the open end of the can (10) and the hollow portion (29) of the electrode assembly (20). Accordingly, welding can be performed between the terminal joint (31) of the first collector plate (30) and the bottom of the can (10). Of course, the welding method of the present invention is not limited to resistance welding. Ultrasonic welding or laser welding may also be applied.

[0124] Referring to Fig. 7, after welding of the first collector plate (30) and the can (10), a beading portion (113) can be formed at the end of the side wall member (11). The other axial end of the electrode assembly (20) and the cap assembly (16) can be electrically connected through the second collector plate (40). Accordingly, the second electrode (22) of the electrode assembly (20) can be electrically connected to the electrode terminal (161) of the cap assembly (16) through the second collector plate (40).

[0125] Preferably, the cap assembly (16) may further include a current interrupting disc (CID) (165). One end of the second collector plate (40) may be joined to the electrode tab (27) of the electrode assembly (20), and the other end may be joined to the current interrupting disc (165) of the cap assembly (16).

[0126] Preferably, the cap assembly (16) may further include a vent (163) whose central portion is electrically connected to the current blocking disk (165).

[0127] Preferably, the cap assembly (16) may further include an insulating spacer (168) that insulates and separates the periphery of the current blocking disk (165) and the vent (163).

[0128] The edge of the vent (163) and the edge of the electrode terminal (161) are axially overlapped and placed on the beading portion (113). The edge of the vent (163) and the edge of the electrode terminal (161) are sealed and fixed by the beading portion (113) and the crimping portion (115).

[0129] The edge of the above vent (163) and the edge of the electrode terminal (161) are sealed and fixed with a gasket (167) interposed therebetween, so that the can (10) and the cap assembly (16) are electrically insulated from each other.

[0130] Referring to FIG. 8, the can (10) of the cylindrical battery cell has a first polarity corresponding to the first electrode (21) of the electrode assembly (20), and the electrode terminal (161) is positioned at the upper center of the cylindrical battery cell and has a second polarity corresponding to the second electrode (22) of the electrode assembly (20).

[0131] [1st Collected Edition]

[0132] Referring to FIGS. 8 to 35 below, various embodiments of the first collector plate (30) will be described.

[0133] <First Embodiment>

[0134] Referring to FIGS. 8 to 13, the first collector plate (30) of the first embodiment includes a terminal joint (31) provided in the center, an electrode joint (33) spaced apart from the terminal joint (31) and surrounding the terminal joint (31), an elastic connecting portion (35) electrically connecting the terminal joint (31) and the electrode joint (33) between them, and an opening portion (39) spaced apart from the terminal joint (31) and the electrode joint (33).

[0135] The above electrode joint (33) has a circular flat ring shape. The outer diameter of the electrode joint (33) is smaller than the outer diameter of the electrode assembly (20).

[0136] The electrode joint (33) is provided with a plurality of through holes (34) along the circumferential direction. According to an embodiment, four through holes (34) are provided at 90-degree intervals. However, the number of through holes (34) is not limited thereto, and the circumferential spacing between the through holes (34) is not necessarily equal.

[0137] The above through hole (34) is formed in a fan shape. However, the shape of the through hole (34) is not necessarily limited to this.

[0138] The above through hole (34) improves the impregnation property of the electrolyte and reduces the weight of the first collector plate (30).

[0139] Between two circumferentially adjacent through holes (34), the electrode joint (33) is electrically connected to the electrode tab (27) of the first electrode (21) of the electrode assembly (20). Preferably, as described above, the joining can be accomplished by laser welding. According to an embodiment, the joining points may be four points spaced 90 degrees apart in the circumferential direction.

[0140] The terminal joint (31) is arranged radially inside the electrode joint (33), and is spaced apart from the electrode joint (33) in the radial direction and also in the axial direction.

[0141] In order to facilitate resistance welding with the bottom (12) of the can (10) and to increase contact resistance, a plurality of punching processes can be performed on the terminal joint (31).

[0142] The above terminal joint (31) has a circular flat plate shape.

[0143] The elastic connecting portions (35) are provided in multiple numbers. The multiple elastic connecting portions (35) may be arranged spaced apart from each other in the circumferential direction. They may be arranged at equal intervals in the circumferential direction. In the embodiment, the elastic connecting portions (35) have a width of 90 degrees in the circumferential direction and are provided in two numbers at 180 degrees intervals. However, the number of elastic connecting portions, their circumferential widths, and their circumferential intervals are not necessarily limited thereto.

[0144] The space between two elastic connecting portions (35) adjacent in the circumferential direction defines the opening portion (39). A plurality of opening portions (39) are provided, which may correspond to the number of elastic connecting portions (35). In the embodiment, the opening portions (39) are exemplified as having a width of 90 degrees in the circumferential direction and being provided in two at 180 degree intervals. However, the number thereof, the circumferential width thereof, and the circumferential interval thereof are not necessarily limited thereto.

[0145] The above opening (39) allows the flow of gas through it. Therefore, when inserting the electrode assembly (20) to which the first collector plate (30) is joined into the can (10), the phenomenon of air resistance hindering the insertion of the electrode assembly (20) can be minimized.

[0146] The above elastic connecting portion (35) extends from the electrode connecting portion (33) toward the terminal connecting portion (31) and electrically connects the electrode connecting portion (33) and the terminal connecting portion (31).

[0147] According to the first embodiment of the first collector plate (30), the elastic connecting portion (35) includes a first connecting section (36) having a radially outer end and a radially inner end and extending laterally (outwardly) as it goes radially inward, and a second connecting section (37) having a radially outer end and a radially inner end and extending axially (inwardly) as it goes radially inward.

[0148] In the above elastic connecting portion (35), the first connecting section (36) and the second connecting section (37) are arranged alternately along the extension direction.

[0149] In the above elastic connecting portion (35), the radially outer end of the first connecting section (36) is connected to the radially inner end of the electrode joint (33).

[0150] In the elastic connecting portion (35), the radially inner end of the first connecting section (36) is connected to the radially inner end of the second connecting section (37).

[0151] In the elastic connecting portion (35), the radially outer end of the second connecting section (37) is connected to the radially outer end of the terminal joint (31).

[0152] The radially outer end of the second connecting section (37) may be positioned radially further inward than the radially outer end of the first connecting section (36).

[0153] Referring to the dotted line in Fig. 13, the shape of this elastic connecting portion (35) may be a type of axial spring structure.

[0154] Accordingly, even if the terminal joint (31) is joined to the bottom (12) of the can (10), the vibration and shock of the can (10) are not transmitted directly to the electrode joint (33). The elastic connecting portion (35) dampens vibration and absorbs shock.

[0155] The elastic connecting portion (35) allows for a change in the relative axial position of the terminal joint (31) with respect to the electrode joint (33). In addition, the elastic connecting portion (35) also allows for a change in the relative radial position of the terminal joint (31) with respect to the electrode joint (33).

[0156] When the welding electrode (R) presses the terminal joint (31) axially outward to resist weld the terminal joint (31) to the bottom (12) of the can (10), the elastic connecting portion (35) is naturally elastically deformed. Accordingly, pretensioning between the terminal joint (31) and the electrode joint (33) can be minimized.

[0157] The elastic connecting portion (35) is positioned in a path through which vibration or external impact applied to the can (10) is transmitted to the electrode connecting portion (33) via the terminal connecting portion (31). The elastic connecting portion (35) is naturally elastically deformed in response to the vibration or impact. Accordingly, the magnitude of tensile stress or compressive stress repeatedly and continuously applied to the connection portion between the terminal connecting portion (31) and the electrode connecting portion (33) can be minimized.

[0158] In the first embodiment of the cylindrical battery cell, the first embodiment of the first collector plate is applied as an example.

[0159] <Second Embodiment>

[0160] The first collector plate (30) of the second embodiment will be described with reference to FIGS. 14 and 15. In describing the following embodiments, any description that overlaps with the previously described embodiments will be omitted.

[0161] According to the second embodiment of the first collector plate (30), the elastic connecting portion (35) includes two first connecting sections (36-1, 36-2) and one second connecting section (37).

[0162] The above first connection section (36) and second connection section (37) are arranged alternately along the extension direction.

[0163] In the above elastic connecting portion (35), the radially outer end of the first connecting section (36-1) is connected to the radially inner end of the electrode joint (33).

[0164] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-1) is connected to the radially inner end of the second connecting section (37).

[0165] In the elastic connecting portion (35), the radially outer end of the second connecting section (37) is connected to the radially outer end of the first connecting section (36-2).

[0166] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-2) is connected to the radially outer end of the terminal joint (31).

[0167] The radially inner end of the first connecting section (36-2) may be positioned radially further inward than the radially inner end of the first connecting section (36-1).

[0168] Referring to the dotted line in Fig. 15, the shape of this elastic connecting portion (35) may be a type of axial spring structure.

[0169] <Third Embodiment>

[0170] The first collector plate (30) of the third embodiment will be described with reference to FIGS. 16 and 17.

[0171] According to the third embodiment of the first collector plate (30), the elastic connecting portion (35) includes two first connecting sections (36-1, 36-2) and two second connecting sections (37-1, 37-2).

[0172] The above first connection section (36) and second connection section (37) are arranged alternately along the extension direction.

[0173] In the above elastic connecting portion (35), the radially outer end of the first connecting section (36-1) is connected to the radially inner end of the electrode joint (33).

[0174] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-1) is connected to the radially inner end of the second connecting section (37-1).

[0175] In the elastic connecting portion (35), the radially outer end of the second connecting section (37-1) is connected to the radially outer end of the first connecting section (36-2).

[0176] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-2) is connected to the radially inner end of the second connecting section (37-2).

[0177] In the elastic connecting portion (35), the radially outer end of the second connecting section (37-2) is connected to the radially outer end of the terminal joint (31).

[0178] The radially inner end of the first connecting section (36-2) may be positioned radially further inward than the radially inner end of the first connecting section (36-1).

[0179] The radially outer end of the second connecting section (37-2) may be positioned radially further inward than the radially outer end of the second connecting section (37-1).

[0180] Referring to the dotted line in Fig. 17, the shape of this elastic connecting portion (35) may be a type of axial spring structure.

[0181] <Fourth Embodiment>

[0182] The first collector plate (30) of the fourth embodiment will be described with reference to FIGS. 18 and 19.

[0183] According to the fourth embodiment of the first collector plate (30), the elastic connecting portion (35) includes one first connecting section (36) and one second connecting section (37).

[0184] The above first connection section (36) and second connection section (37) are arranged alternately along the extension direction.

[0185] In the above elastic connecting portion (35), the radially outer end of the first connecting section (36) is connected to the radially inner end of the electrode joint (33).

[0186] In the elastic connecting portion (35), the radially inner end of the first connecting section (36) is connected to the radially outer end of the second connecting section (37).

[0187] In the elastic connecting portion (35), the radially inner end of the second connecting section (37) is connected to the radially outer end of the terminal joint (31).

[0188] Referring to the dotted line in Fig. 19, the shape of this elastic connecting portion (35) may be a type of radial spring structure.

[0189] <Example 5>

[0190] The first collector plate (30) of the fifth embodiment will be described with reference to FIGS. 20 and 21.

[0191] According to the fifth embodiment of the first collector plate (30), the elastic connecting portion (35) includes two first connecting sections (36-1, 36-2) and one second connecting section (37).

[0192] The above first connection section (36) and second connection section (37) are arranged alternately along the extension direction.

[0193] In the above elastic connecting portion (35), the radially outer end of the first connecting section (36-1) is connected to the radially inner end of the electrode joint (33).

[0194] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-1) is connected to the radially outer end of the second connecting section (37).

[0195] In the elastic connecting portion (35), the radially inner end of the second connecting section (37) is connected to the radially outer end of the first connecting section (36-2).

[0196] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-2) is connected to the radially outer end of the terminal joint (31).

[0197] The radially inner end of the first connecting section (36-1) may be positioned axially further inward than the radially inner end of the first connecting section (36-2).

[0198] Referring to the dotted line in Fig. 21, the shape of this elastic connecting portion (35) may be a type of radial spring structure.

[0199] <Example 6>

[0200] The first collector plate (30) of the sixth embodiment will be described with reference to FIGS. 22 and 23.

[0201] According to the sixth embodiment of the first collector plate (30), the elastic connecting portion (35) includes two first connecting sections (36-1, 36-2) and two second connecting sections (37-1, 37-2).

[0202] The above first connection section (36) and second connection section (37) are arranged alternately along the extension direction.

[0203] In the above elastic connecting portion (35), the radially outer end of the first connecting section (36-1) is connected to the radially inner end of the electrode joint (33).

[0204] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-1) is connected to the radially outer end of the second connecting section (37-1).

[0205] In the elastic connecting portion (35), the radially inner end of the second connecting section (37-1) is connected to the radially outer end of the first connecting section (36-2).

[0206] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-2) is connected to the radially outer end of the second connecting section (37-2).

[0207] In the elastic connecting portion (35), the radially inner end of the second connecting section (37-2) is connected to the radially outer end of the terminal joint (31).

[0208] Referring to the dotted line in Fig. 23, the shape of this elastic connecting portion (35) may be a type of radial spring structure.

[0209] <Seventh Embodiment>

[0210] The first collector plate (30) of the seventh embodiment will be described with reference to FIGS. 24 and 25.

[0211] According to the seventh embodiment of the first collector plate (30), the elastic connecting portion (35) includes one second connecting section (37) and one first connecting section (36).

[0212] The above second connection section (37) and the first connection section (36) are arranged alternately along the extension direction.

[0213] In the above elastic connecting portion (35), the radially outer end of the second connecting section (37) is connected to the radially inner end of the electrode joint (33).

[0214] In the elastic connecting portion (35), the radially inner end of the second connecting section (37) is connected to the radially outer end of the first connecting section (36).

[0215] In the elastic connecting portion (35), the radially inner end of the first connecting section (36) is connected to the radially outer end of the terminal joint (31).

[0216] Referring to the dotted line in Fig. 25, the shape of this elastic connecting portion (35) may be a type of radial spring structure.

[0217] <Embodiment 8>

[0218] The first collector plate (30) of the eighth embodiment will be described with reference to FIGS. 26 and 27.

[0219] According to the eighth embodiment of the first collector plate (30), the elastic connecting portion (35) includes two second connecting sections (37-1, 37-2) and one first connecting section (36).

[0220] The above second connection section (37) and the first connection section (36) are arranged alternately along the extension direction.

[0221] In the above elastic connecting portion (35), the radially outer end of the second connecting section (37-1) is connected to the radially inner end of the electrode joint (33).

[0222] In the elastic connecting portion (35), the radially inner end of the second connecting section (37-1) is connected to the radially outer end of the first connecting section (36).

[0223] In the elastic connecting portion (35), the radially inner end of the first connecting section (36) is connected to the radially outer end of the second connecting section (37-2).

[0224] In the elastic connecting portion (35), the radially inner end of the second connecting section (37-2) is connected to the radially outer end of the terminal joint (31).

[0225] Referring to the dotted line in Fig. 27, the shape of this elastic connecting portion (35) may be a type of radial spring structure.

[0226] The eighth embodiment of the above first collector plate is exemplified as being applied to the second embodiment of the cylindrical battery cell described later.

[0227] <Example 9>

[0228] The first collector plate (30) of the ninth embodiment will be described with reference to FIGS. 28 and 29.

[0229] According to the ninth embodiment of the first collector plate (30), the elastic connecting portion (35) includes two second connecting sections (37-1, 37-2) and two first connecting sections (36-1, 36-2).

[0230] The above second connection section (37) and the first connection section (36) are arranged alternately along the extension direction.

[0231] In the above elastic connecting portion (35), the radially outer end of the second connecting section (37-1) is connected to the radially inner end of the electrode joint (33).

[0232] In the elastic connecting portion (35), the radially inner end of the second connecting section (37-1) is connected to the radially outer end of the first connecting section (36-1).

[0233] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-1) is connected to the radially outer end of the second connecting section (37-2).

[0234] In the elastic connecting portion (35), the radially inner end of the second connecting section (37-2) is connected to the radially outer end of the first connecting section (36-2).

[0235] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-2) is connected to the radially outer end of the terminal joint (31).

[0236] The radially inner end of the first connecting section (36-2) may be positioned axially further outward than the radially inner end of the first connecting section (36-1).

[0237] The radially inner end of the second connecting section (37-2) may be positioned axially further outward than the radially inner end of the second connecting section (37-1).

[0238] Referring to the dotted line in Fig. 29, the shape of this elastic connecting portion (35) may be a type of radial spring structure.

[0239] <Example 10>

[0240] The first collector plate (30) of the 10th embodiment will be described with reference to FIGS. 30 and 31.

[0241] According to the tenth embodiment of the first collector plate (30), the elastic connecting portion (35) includes a plurality of first connecting sections (36-1, 36-2, 36-3). The embodiment exemplifies that three first connecting sections are provided. The first connecting sections may also be provided in two or four numbers.

[0242] In the above elastic connecting portion (35), the radially outer end of the first connecting section (36-1) is connected to the radially inner end of the electrode joint (33).

[0243] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-1) is connected to the radially outer end of the first connecting section (36-2).

[0244] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-2) is connected to the radially outer end of the first connecting section (36-3).

[0245] In the elastic connecting portion (35), the radially inner end of the first connecting section (36-3) is connected to the radially outer end of the terminal joint (31).

[0246] The slope of the above first connecting section can be defined as the axial extension distance relative to the radial extension distance. In other words, if the axial extension distance is longer than the same radial extension distance, it can be understood that the slope is greater or steeper.

[0247] In the 10th embodiment, the slope of the first connecting section (36-1, 36-2, 36-3) gradually increases along the extension direction.

[0248] Referring to the dotted line in Fig. 31, the shape of this elastic connection portion (35) is similar to the shape of an arc whose center is positioned both axially and radially outside the terminal joint portion (31).

[0249] <Embodiment 11>

[0250] The first collector plate (30) of the 11th embodiment will be described with reference to FIGS. 32 and 33.

[0251] According to the eleventh embodiment of the first collector plate (30), the elastic connecting portion (35) includes three first connecting sections (36-1, 36-2, 36-3).

[0252] In the 11th embodiment, the slope of the first connecting section (36-1, 36-2, 36-3) gradually decreases along the extension direction.

[0253] Referring to the dotted line in Fig. 33, the shape of this elastic connection portion (35) is similar to the shape of an arc whose center is positioned axially further inward than the terminal connection portion (31) and radially further inward than the electrode connection portion (33).

[0254] <Example 12>

[0255] The first collector plate (30) of the 12th embodiment will be described with reference to FIGS. 34 and 35.

[0256] According to the twelfth embodiment of the first collector plate (30), the elastic connecting portion (35) includes three first connecting sections (36-1, 36-2, 36-3).

[0257] In the 12th embodiment, the slope of the first connecting section (36-1, 36-2, 36-3) repeatedly increases and decreases along the extension direction. That is, compared to the first connecting section (36-1), the slope of the first connecting section (36-2) increases, and compared to the first connecting section (36-2), the slope of the first connecting section (36-3) decreases.

[0258] Referring to the dotted line in Fig. 35, the shape of this elastic connecting portion (35) may be a type of diagonal spring structure.

[0259] [Cylindrical Battery Cell - Second Embodiment]

[0260] The various embodiments of the first collector plates (30) described above can be applied not only to the first embodiment of the cylindrical battery cell described above, but also to the second embodiment described below.

[0261] Referring to FIGS. 36 to 41 below, a second embodiment of a cylindrical battery cell of the present invention will be described. In describing this, any explanation that overlaps with the first embodiment will be omitted.

[0262] The can (10) of the battery cell of the second embodiment includes a bottom member (12), a side wall member (11) connected to the bottom member (12) and extending in the axial direction, and a vent (163) covering an open end provided at one axial end of the side wall member (11).

[0263] The above floor member (12) has a disc shape with a hole formed in the center.

[0264] A first electrode terminal (13) can be fitted into the hole. The first electrode terminal (13) can be fixed by riveting to the bottom member (12) with a gasket (14) interposed therebetween. The gasket (14) is interposed between the first electrode terminal (13) and the bottom member (12), sealing the inside and outside of the can (10) to prevent leakage of the electrolyte, and electrically insulating the first electrode terminal (13) and the bottom member (12).

[0265] However, the method of connecting the first electrode terminal (13) and the bottom member (12) is not limited to this. For example, if there is a structure that can seal between the first electrode terminal (13) and the bottom member (12) and electrically insulate the first electrode terminal (13) and the bottom member (12), various other fixing methods, such as a bolt-nut joint method, a glass seal method, or a chrome coating & PP-MAH thermal bonding method, can also be applied.

[0266] The above first electrode terminal (13) may have a first polarity, and the can (10) may have a second polarity. That is, the bottom member (12) of the can (10) and the side wall member (11) connected thereto may both have a second polarity.

[0267] Accordingly, the battery cell may have both the first electrode terminal (13) and the second electrode terminal (15) positioned at the axial end, i.e., the closed end, provided with the bottom member (12), as illustrated in Fig. 36. Then, the battery cell may have both the bus bar connected to the first electrode terminal (13) and the bus bar connected to the second electrode terminal (15) positioned at the upper portion of the battery cell.

[0268] In one example, the first electrode terminal (13) may be a positive terminal and the second electrode terminal (15) may be a negative terminal. Of course, the opposite may also be true.

[0269] The notched tabs (27) of the first electrode (21) and the notched tabs (27) of the second electrode (22) of the electrode assembly (20) that are bent and overlapped in the radial direction can provide a plane that is substantially perpendicular to the axial direction at each of the axial ends of the electrode assembly (20).

[0270] The first collector plate (30) and the second collector plate (40) can be joined to a substantially flat surface provided by bending the notched tabs (27) exposed at both axial ends of the electrode assembly (20), as shown in FIGS. 37 and 38.

[0271] In the second embodiment, it is exemplified that the first collector plate (30) is a positive collector plate and the second collector plate (40) is a negative collector plate.

[0272] Referring to Fig. 38, the second collector plate (40) includes an inner ring (41) that defines a hole (42) corresponding to the core hollow portion (29) of the electrode assembly (20) and is provided in a form that surrounds the core hollow portion, an electrode connection portion (43) that extends radially from the inner ring (41), and a can connection portion (44) that is positioned on the centrifugal side relative to the electrode tab connection portion (43) and is connected to the inner ring (41).

[0273] As illustrated in FIGS. 39 and 40, the electrode assembly (20) is accommodated in the can (10) in a state where the first collector plate (30) is aligned so as to face the bottom member (12) of the can (10). At this time, an insulator (19) is interposed between the first collector plate (30) and the bottom member (12) of the can (10) so as to electrically insulate the first collector plate (30) and the bottom member (12).

[0274] And, the terminal joint (31) of the first collector plate (30) is joined to the first electrode terminal (13) fixed to the bottom (12) by resistance welding, ultrasonic welding, laser welding, or the like. The welding device for welding the first collector plate (30) and the first electrode terminal (13) can approach the back surface of the center of the terminal joint (31) of the first collector plate (30) through the core hollow portion (29) of the electrode assembly (20) from the open end of the can (10) to perform welding. Of course, in addition to this, the first collector plate (30) and the first electrode terminal (13) can also be joined by brazing or soldering. In other words, various methods can be applied to the first collector plate (30) and the first electrode terminal (13) as long as they are a joining method that can electrically connect them and fix them to each other.

[0275] In FIGS. 39 and 40, the electrode assembly (20) is inserted into the can (10) in a state where the second collector plate (40) is not bonded to the electrode assembly (20). However, as illustrated in FIG. 38, it is of course also possible to insert the electrode assembly (20) into the can (10) in a state where the second collector plate (40) is bonded to the electrode assembly (20).

[0276] In a state where the electrode assembly (20) is accommodated inside the can (10), the electrode tab (27) of the second electrode (22) and the second current collector (40) are arranged to face the open end of the side wall member (11).

[0277] With the electrode assembly (20) housed inside the can (10), the end of the side wall member (11) of the can (10) can be molded inward to form a beading portion (113). Then, welding of these can be performed with the can connection portion (44) of the second collector plate (40) in contact with the beading portion (113).

[0278] After the electrolyte is injected into the can (10), a vent (163) may be placed on the beading portion (113) and crimped to cover the open end of the can (10). At this time, a gasket (167) may be interposed between the beading portion (113) and crimping portion (115) of the side wall member (11) and the vent (163) to form an insulating seal. Accordingly, the vent (163) may be non-polar.

[0279] In view of this, the first collector plate (30) may be a bottom collector plate facing the bottom (12) of the can (10), and the second collector plate (40) may be an open end collector plate facing the open end of the can (10).

[0280] It should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of the claims that follow, as well as all possible modifications and variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

[0281] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. A terminal joint where one side is joined to a cap, can bottom, or electrode terminal; An electrode joint surrounding the terminal joint on the radially outer side of the terminal joint and having the other side joined to the electrode tab of the electrode assembly; An elastic connecting portion disposed between the electrode joint and the terminal joint and electrically connecting the electrode joint and the terminal joint; and A current collector plate including an opening disposed between adjacent elastic connecting portions in a circumferential direction and separating the electrode joint and the terminal joint in a radial or axial direction; The above elastic connecting part; A first connecting section having a radially outer end and a radially inner end, and extending laterally (outwardly) as it goes radially inward; and A second connecting section having a radially outer end and a radially inner end, and extending axially toward the other side (inner side) as it goes radially inward; A collector plate containing at least one of the following:

2. In claim 1, the elastic connecting portion is a current collector plate in which the first connecting section and the second connecting section are alternately arranged as the elastic connecting portion extends from the electrode connecting portion toward the terminal connecting portion.

3. In claim 2, the first connecting section and the second connecting section adjacent to each other in the extension direction of the elastic connecting section are a current collector plate in which the radially inner end of the first connecting section and the radially inner end of the second connecting section are connected.

4. In claim 3, the first connecting section and the second connecting section adjacent to each other in the extension direction of the elastic connecting section are a current collector plate in which the radially outer end of the second connecting section and the radially outer end of the first connecting section are connected.

5. In claim 2, the first connecting section and the second connecting section adjacent to each other in the extension direction of the elastic connecting section are a current collector plate in which a radially inner end of the first connecting section and a radially outer end of the second connecting section are connected.

6. In claim 5, the first connecting section and the second connecting section adjacent to each other in the extension direction of the elastic connecting section are a current collector plate in which the radially inner end of the second connecting section and the radially outer end of the first connecting section are connected.

7. In claim 1, the elastic connecting portion is a current collector plate in which the second connecting section and the first connecting section are alternately arranged as the elastic connecting portion extends from the electrode connecting portion toward the terminal connecting portion.

8. In claim 7, the first connecting section and the second connecting section adjacent to each other in the extension direction of the elastic connecting section are a current collector plate in which the radially inner end of the second connecting section and the radially outer end of the first connecting section are connected.

9. In claim 8, the first connecting section and the second connecting section adjacent to each other in the extension direction of the elastic connecting section are a current collector plate in which a radially inner end of the first connecting section and a radially outer end of the second connecting section are connected.

10. In claim 1, the elastic connecting portion is a current collector plate in which first connecting sections having different slopes are arranged as they extend from the electrode connecting portion toward the terminal connecting portion.

11. In claim 10, the inclination of the different first connecting sections is such that the current collector plate increases as it extends.

12. In claim 10, the inclination of the different first connecting sections becomes smaller as it goes in the extension direction.

13. In claim 10, the inclination of the different first connecting sections is a collector plate that repeatedly increases and decreases as it extends.

14. A current collector plate according to claim 1, wherein the terminal joint comprises a flat plate shape.

15. A current collector plate according to claim 1, wherein the terminal joint comprises a flat ring shape.

16. A can having a bottom member and a side wall member; An electrode assembly accommodated in the above can; A cap covering the open end of the can while the electrode assembly is accommodated in the can; electrode terminals; and A battery cell comprising a current collector plate according to any one of claims 1 to 15, one side of which is joined to the cap, the bottom member of the can, or the electrode terminal, and the other side of which is electrically connected to an electrode tab provided on one axial side of the electrode assembly.

17. A battery cell according to claim 16, wherein the battery cell is cylindrical.

18. In claim 16, the electrode terminal is provided in the cap, a battery cell.

19. In claim 16, the electrode terminal is insulated and fixed to the bottom member, the battery cell.

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