Welded heat insulation member, electrode assembly damage prevention structure using welded heat insulation member, and battery cell using welded heat insulation member

Abstract

There is provided a battery cell comprising: a can comprising a bottom member and a side wall member; a cap covering the opening of the canister; and an electrode assembly disposed inside the can. The collector plate is connected to an electrode tab provided at a second end provided at an open end of the canister, among the first and second ends located at respective sides of the electrode assembly in the axial direction. The collector plate includes: an electrode tab connection portion that is in contact with and electrically connected to the electrode tab; a tank connection portion provided further outward than the electrode tab connection portion in the radial direction, and contacting and electrically connected with the tank; and a conductive connection portion electrically connecting the can connection portion and the electrode tab connection portion. A periphery of one end of the side wall member and an outer periphery of the cap in a radial direction are seam-welded in a circumferential direction, and at least a portion of the heat insulating member is interposed between the collector plate and the electrode assembly in an axial direction.

Description

Technical Field

[0001] This application is based on and claims the benefit of priority of Korean Patent Application No. 10-2023-0083012 filed in the Korean Intellectual Property Office on June 27, 2023, and Korean Patent Application No. 10-2024-0069583 filed in the Korean Intellectual Property Office on May 28, 2024, the disclosures of which are incorporated herein by reference in their entirety.

[0002] The present disclosure relates to a welding heat insulating member for preventing welding heat generated during welding of a battery can, a current collecting plate and a cap from damaging a separator of an electrode assembly, an electrode assembly damage prevention structure using the welding heat insulating member, and a battery cell using the welding heat insulating member. Background Art

[0003] The process of manufacturing a battery cell using a cylindrical can may include the following steps: deep drawing a metal sheet to form a circular bottom and a circular tubular sidewall member connected to the circular bottom and accommodating an electrode assembly therein; and then covering the open end of the sidewall member with a cap or cover to complete the process. For ease of explanation, the cap or cover will be collectively referred to as a cap below.

[0004] At the same time, a current collecting plate is provided at the end facing the open end among the ends in the axial direction of the electrode assembly to contact and electrically connect with the electrode joint of the electrode assembly. The current collecting plate is connected to the cap or the side wall member by welding, etc., so as to contact and electrically connect with the cap or the side wall member.

[0005] Cylindrical lithium-ion batteries require excellent sealing to prevent performance degradation due to electrolyte leakage and to prevent fire due to contact with air or moisture. To this end, seam welding using lasers in the assembly process of cylindrical cans and caps is being developed.

[0006] As is known, laser seam welding technology ensures excellent sealing and mechanical strength by melting and joining cans and caps using lasers. However, since laser is a heat source with high energy density, welding heat may be transferred to the outside of the welded portion during the welding process. Therefore, there is a possibility that other components around the welded portion may be damaged by the welding heat.

[0007] In particular, the diaphragm of the electrode assembly made of a microporous polymer film is more susceptible to thermal damage, such as deformation, loss, and melting, compared to steel, aluminum, and copper materials constituting the electrode assembly or other parts. However, if a low-energy-density laser is used to prevent this, there is a problem that the width and penetration depth of the weld bead will be reduced, which may reduce the sealing performance and mechanical strength of the welded part. In other words, the possibility of diaphragm damage due to laser output and sealing performance are often a trade-off.

[0008] These characteristics make it difficult to optimize laser process parameters. In addition, the process window may shrink during mass production, potentially reducing the production yield of the product.

[0009] Therefore, a method is needed to prevent damage to the diaphragm due to welding heat when using high energy density lasers during laser seam welding. Summary of the invention

[0010] Technical issues

[0011] The present disclosure is intended to solve the problems of the prior art, and thus the present disclosure is intended to provide a method for preventing welding heat generated during the seam welding process of a battery can from damaging surrounding components.

[0012] The present disclosure aims to provide a method for seam welding a battery can using a high energy density laser to ensure welding quality while preventing the welding heat generated thereby from damaging surrounding components.

[0013] The present disclosure is directed to a method for improving yield by expanding the process window for seam welding battery cans.

[0014] The present disclosure aims to provide a method for ensuring a process margin for laser seam welding of a battery can.

[0015] These and other purposes and advantages of the present disclosure can be understood from the following detailed description and will become more fully apparent from the exemplary embodiments of the present disclosure. In addition, it will be easily understood that the purposes and advantages of the present disclosure can be achieved by the means shown in the appended claims and their combinations.

[0016] Technical Solution

[0017] To achieve the above object, the present disclosure may be applied to a battery cell including an electrode assembly, a current collecting plate electrically connected to the electrode assembly, and a can accommodating the electrode assembly and the current collecting plate.

[0018] The can includes: a bottom member; a side wall member connected to the bottom member and extending to one side in an axial direction; and a cap covering an open end provided at one axial end of the side wall member.

[0019] A periphery of one end of the side wall member and an outer periphery of the cap in the radial direction may be seam welded in a circumferential direction.

[0020] The electrode assembly may have a core form wound around a circumference of a predetermined axis.

[0021] An electrode tab may be provided at one end facing the open end among both axial ends of the electrode assembly, and the current collecting plate may be connected to the electrode tab.

[0022] The current collecting plate may include an electrode tab connecting portion contacting the electrode tab and electrically connected to the electrode tab.

[0023] The current collecting plate may include a can connection portion contacting the can and electrically connected to the can.

[0024] The current collecting plate may include a conductive connection portion disposed between the can connection portion and the electrode tab connection portion and connecting the can connection portion and the electrode tab connection portion.

[0025] The can connection portion and the electrode tap connection portion may be electrically connected to each other through the conductive connection portion.

[0026] The current collecting plate may include an inner ring.

[0027] The inner ring may define a hole facing a wound central hollow portion of the electrode assembly.

[0028] The current collecting plate may further include an outer ring disposed outside the inner ring in the radial direction and extending to surround the inner ring.

[0029] The current collecting plate may further include at least one first spoke and at least one second spoke connected to the inner ring and extending outwardly from the inner ring in the radial direction.

[0030] The first spoke may extend outwardly in the radial direction from a first position of the inner ring in the circumferential direction.

[0031] The second spoke may extend outwardly in the radial direction from a second position of the inner ring that does not overlap with the first position in the circumferential direction.

[0032] The first spoke and the second spoke may be spaced apart from each other in the circumferential direction.

[0033] The outer ring may be spaced apart from the first spoke and connected to the second spoke.

[0034] The outer ring may be disposed outwardly from a radially outer end of the first spoke in the radial direction.

[0035] The outer ring may be connected to the radially outer ends of the second spokes.

[0036] The inner loop may be in a closed loop shape or an open loop shape.

[0037] The outer ring may be in a closed loop shape or an open loop shape.

[0038] Preferably, the outer ring may have a closed loop shape.

[0039] The electrode tab connection portion may be provided at least on the first spoke.

[0040] The electrode terminal connection portion may also be disposed at a first position of the inner ring in the circumferential direction.

[0041] The tank connection portion may be provided on the outer ring.

[0042] The conductive connection portion may be provided at least on the second spoke.

[0043] The conductive connection portion may also be provided at a second position of the inner ring in the circumferential direction.

[0044] The conductive connection portion may be further provided at a third position that is arranged between the first position and the second position along a circumferential direction of the inner ring.

[0045] The conductive connection portion may also be disposed at a first position in the circumferential direction of the inner ring.

[0046] The battery cell includes an insulating member that prevents heat generated when seam welding the sidewall member and the cap from being transferred to the electrode assembly.

[0047] At least a portion of the insulating member is interposed between the current collecting plate and the electrode assembly in the axial direction.

[0048] The insulating member may be disposed to extend from a space between the electrode tap connection portion and the electrode assembly in the axial direction.

[0049] The insulating member may be disposed to extend from a space between the first spoke and the electrode assembly in the axial direction.

[0050] By providing the escape groove in the insulating member, the insulating member may not be interposed between the electrode tap connection portion and the electrode assembly in the axial direction.

[0051] At least a portion of the insulating member may be disposed between the can connection portion and the electrode assembly in the axial direction.

[0052] At least a portion of the insulating member may be disposed between the outer ring and the electrode assembly in the axial direction.

[0053] At least a portion of the insulating member may be disposed between the second spoke and the electrode assembly in the axial direction.

[0054] At least a portion of the insulating member may be disposed between a second position of the inner ring in the circumferential direction and the electrode assembly in the axial direction.

[0055] At least a portion of the insulating member may be disposed between a third position of the inner ring in the circumferential direction and the electrode assembly in the axial direction.

[0056] At least a portion of the insulating member may be disposed between a first position of the inner ring in the circumferential direction and the electrode assembly in the axial direction.

[0057] At least a portion of the insulating member may be disposed outside the electrode tap connecting portion in the radial direction.

[0058] At least a portion of the insulating member may be disposed outside the first spoke in the radial direction.

[0059] At least a portion of the insulating member may be disposed between two electrode tap connection portions adjacent to each other in the circumferential direction.

[0060] At least a portion of the insulating member may be disposed between the first spokes in the circumferential direction.

[0061] The insulating member may cover a space between the electrode tap connection portion and the can connection portion in the radial direction.

[0062] The insulating member may cover a space between the first spoke and the outer ring in the radial direction.

[0063] The insulating member may cover a space between the inner ring and the outer ring in the radial direction.

[0064] The insulating member may cover a space between the electrode tap connection portion and the conductive connection portion in the circumferential direction.

[0065] The insulating member may cover a space between the first spoke and the second spoke in the circumferential direction.

[0066] The insulating member may cover a spacing space between the electrode tap connection portion and the can connection portion in the radial direction and / or the circumferential direction.

[0067] The insulating member may include a high heat-resistant polymer material.

[0068] The insulating member may be a material that does not substantially react with the electrolyte.

[0069] The insulating member may be substantially chemically stable to the electrolyte injected into the can.

[0070] The insulating member may include at least one of polycarbonate (PC), polyethylene naphthalate (PEN), polyetheretherketone (PEEK), and polyethylene terephthalate (PET).

[0071] The can connection portion or the outer ring may include a first area in contact with the sidewall member and a second area in contact with the cap.

[0072] The first region and the side wall member may be joined by welding.

[0073] The second region and the cap may be joined by welding.

[0074] The first region and the second region may be welded at one time.

[0075] The welding may be laser welding.

[0076] The first region may be the tank connection portion or the outer peripheral surface of the outer ring that faces and contacts the inner peripheral surface of the side wall member in the radial direction.

[0077] The second region may be an outer surface in the axial direction of the outer ring that faces in the axial direction and contacts an inner surface in the axial direction of the cap.

[0078] The cap may include an outer peripheral surface facing and contacting an inner peripheral surface of the sidewall member in the radial direction.

[0079] The battery cell may include a welding portion in which an inner circumferential surface of the sidewall member, an outer circumferential surface of the cap, and a can connection portion of the current collecting plate or a first region and a second region of the outer ring are welded together.

[0080] The outer peripheral surfaces of the cap and the tank connecting portion or the outer peripheral surface of the outer ring may each be in contact with the inner peripheral surface of the side wall member.

[0081] An axial end of the outer peripheral surface of the cap and an axial end of the inner peripheral surface of the side wall member facing each other in the radial direction may be exposed outside the axial direction.

[0082] The welded portion may be formed by laser radiated from the outside of the battery cell in the axial direction to the axial end of the outer circumferential surface of the cap and the axial end of the inner circumferential surface of the side wall member.

[0083] The thermal conductivity of the current collecting plate may be higher than that of the side wall member. Therefore, the welding heat may be distributed to the electrode assembly through the current collecting plate.

[0084] When the welding heat is conducted through the current collecting plate, the temperature may gradually decrease. Therefore, it is preferred that the insulating member is interposed between the current collecting plate and the electrode assembly at least in a portion corresponding to an initial path along which the welding heat is conducted.

[0085] The position where the welding heat is first conducted in the current collecting plate may be the outer ring. The welding heat may be conducted in the current collecting plate in the order of the outer ring, the second spoke, the inner ring, and the first spoke, or in the order of the tank connection portion, the conductive connection portion, and the electrode joint connection portion.

[0086] Therefore, the insulating member may be disposed at least between the can connection portion or the outer ring of the current collecting plate and the electrode assembly. Preferably, the insulating member may be further disposed between the conductive connection portion or the second spoke of the current collecting plate and the electrode assembly.

[0087] In addition, the insulating member may be further disposed between at least a portion of the inner ring and the electrode assembly.

[0088] In addition, the welding heat may also be transferred to the electrode assembly by radiation.

[0089] Therefore, preferably, the insulating member may cover the spacing space between the electrode joint connection portion and the tank connection portion, or the spacing space between the outer ring and the inner ring and the first spoke and the second spoke in the radial direction and / or the circumferential direction. Specifically, the insulating member may cover the electrode assembly so that the electrode assembly is not exposed through the spacing space.

[0090] Laser seam welding may be performed along the edge of the current collecting plate in the circumferential direction. Therefore, preferably, the insulating member may include a ring shape extending inwardly from the edge of the current collecting plate in the radial direction by a predetermined distance.

[0091] At this time, the insulating member may have a shape in which at least a portion corresponding to the electrode tab connection portion or the first spoke of the current collecting plate is deleted.

[0092] Beneficial Effects

[0093] According to the present disclosure, the influence of welding heat on the electrode assembly can be minimized by applying a welding heat insulating member. Therefore, seam welding can be performed using a laser with high energy density.

[0094] According to the present disclosure, the width and penetration depth of the welding bead can be fully guaranteed while minimizing the influence of welding heat on the electrode assembly. Therefore, the sealing ability and mechanical strength of the welding portion can be fully guaranteed while preventing damage to the separator.

[0095] According to the present disclosure, it is easy to optimize the process variables of the laser, the process window can be widened during mass production, and the process margin can be guaranteed to improve the production yield of the product.

[0096] In addition to the above-described effects, specific effects of the present disclosure will be described below while explaining specific details for implementing the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] Figure 1 is a perspective view showing a cylindrical battery cell according to an embodiment.

[0098] Figure 2 is shown before winding. Figure 1 An exploded perspective view of the electrode assembly inside the can.

[0099] Figure 3 It is shown Figure 2 A perspective view of an electrode assembly in a stacked state before winding.

[0100] Figure 4 is shown by winding Figure 3 A perspective view of an electrode assembly in the form of a cylindrical jellyroll assembled by stacking.

[0101] Figure 5 is a perspective view illustrating a state in which a first current collecting plate is coupled to an electrode tap of a first electrode of an electrode assembly.

[0102] Figure 6 is a perspective view showing an electrode tap in which a second current collecting plate is coupled to a second electrode of an electrode assembly with an insulating member interposed therebetween.

[0103] Figure 7 is a perspective view showing an electrode tap in which a second current collecting plate is coupled to a second electrode of an electrode assembly with an insulating member interposed therebetween.

[0104] Figure 8 is a side sectional view illustrating a process of accommodating an electrode assembly coupled with a current collecting plate inside a can.

[0105] Fig. 9 is a side sectional view illustrating a process in which a first current collecting plate and a first electrode terminal of an electrode assembly accommodated in a can are coupled.

[0106] Fig.10 is a side cross-sectional view showing a process of covering the open end of a can accommodating an electrode assembly with a cap.

[0107] Fig.11 is a side cross-sectional view showing a state in which the opening end of the can accommodating the electrode assembly is covered with a cap.

[0108] Fig.12 is a side cross-sectional view showing a process of seam welding a cap and a side wall member of a can and then injecting an electrolyte through an injection hole of the cap.

[0109] Fig.13 It is a side cross-sectional view showing a state where the injection hole of the cap is sealed with a plug after the electrolyte is completely injected.

[0110] Fig.10 is a side cross-sectional view of a process of covering the open end of a can housing an electrode assembly with a cap.

[0111] Fig.14 It shows that Fig.11 Magnified view of the side wall members, current collectors and caps being welded in a battery cell.

[0112] Fig.15 is shown by welding Fig.14 FIG. 1 is a diagram of a process for forming a welding portion by using a side wall member, a current collecting plate and a cap.

[0113] Fig.16 is a plan view showing a second current collecting plate.

[0114] Fig.17 is a plan view showing an insulating member.

[0115] Fig.18 is a plan view showing an insulating member overlapping the second current collecting plate.

[0116] Fig.19 It is along Fig.18 A cross-sectional view taken along line XIX-XIX.

[0117] Fig. 20 It is along Fig.18 A cross-sectional view taken along line XX-XX.

[0118] Fig.21 is a flowchart for illustrating a battery cell manufacturing process according to an embodiment of the present disclosure.

[0119] Fig. 22 is a flowchart for illustrating a battery cell manufacturing process according to a modified example of the present disclosure.

[0120] Fig.23 and Fig.24 A battery pack to which the battery cell of the present embodiment is applied and a vehicle equipped with the battery pack are shown.

[0121] Reference numerals

[0122] 10: can; 11: side wall member; 117: overhanging portion; 12: bottom member; 13: first electrode terminal (positive terminal); 14: gasket; 15: second electrode terminal; 16: cap; 162: injection hole; 164: plug; 18: insulating member (welded heat insulation member); 181: outer ring; 182: centripetal extension portion; 183: interval space cover portion; 184: radial extension cover portion; 185: avoidance groove; 186: circumferential extension cover portion; 19: insulator; 20: electrode assembly; 21: first electrode; 22: second electrode; 23: metal foil; 24: active material layer; 25: coating portion 26: uncoated portion; 27: electrode joint (slotted joint) 28: diaphragm; 31: first current collector (positive current collector); 312: terminal connection portion; 313: ring portion; 314: electrode connection portion; 32: second current collector (negative current collector); 321: inner ring; 322: hole; 323: electrode joint connection portion; 324: can connection portion; 325: conductive connection portion; 326: first spoke; 327: second spoke; 328: outer ring; 329: spacing; W: welding portion; 70: battery pack; 71: housing; 72: battery cell; 80: vehicle DETAILED DESCRIPTION

[0123] The above-mentioned objects, features and advantages will be described in detail later with reference to the accompanying drawings, so that a person skilled in the art of the present disclosure will be able to easily implement the technical ideas of the present disclosure. When explaining the present disclosure, if it is considered that a detailed description of the known technology related to the present disclosure may unnecessarily obscure the main points of the present disclosure, the detailed explanation will be omitted. Hereinafter, a preferred embodiment according to the present disclosure will be described in detail with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals are used to represent the same or similar parts.

[0124] Although the terms first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are used to distinguish one element from other elements, and unless otherwise stated, the first element may be the second element.

[0125] Throughout the specification, unless otherwise specified, each element may be in the singular or in the plural.

[0126] Hereinafter, when an element is “on (or below)” or “on (or under)” another element, the one element may be on the upper surface (or lower surface) of the other element, and intermediate elements may be present between the one element and the other element located on (or under) the element.

[0127] In addition, when it is stated that one element is “connected,” “coupled” or “linked” to another element, the one element may be directly connected or coupled to the other element, but it should be understood that there may be intermediate elements between each element, or each element may be “connected,” “coupled” or “linked” to each other through another element.

[0128] Unless the context clearly indicates otherwise, singular expressions used in this specification include plural expressions. In this application, terms such as "include" or "comprise" should not be interpreted as necessarily including all the various components or steps described in the specification, but should be interpreted as some components or some steps may not be included, or additional components or steps may be further included.

[0129] Throughout the specification, unless explicitly stated otherwise, “A and / or B” means A or B or both A and B, and unless explicitly stated otherwise, “C to D” means C or greater, and D or less.

[0130] In explaining the embodiments, the axial direction refers to the direction in which the axis forming the winding center of the jellyroll type electrode assembly extends, the radial direction refers to the direction approaching (centripetal) or away from (eccentric) the axis, and the circumferential direction refers to the direction around the axis.

[0131] In the following, reference is made to Figures 1 to 20 , an embodiment of a battery cell to which the welded heat insulating member, ie, the insulating member, of the present disclosure is applied will be described in detail.

[0132] For example, the battery cell of this embodiment may be a cylindrical battery having an aspect ratio (defined as a value obtained by dividing the diameter of a cylindrical battery cell by its height, ie, a ratio of diameter (Φ) to height (H)) greater than about 0.4.

[0133] Here, the form factor refers to a value indicating the diameter and height of a cylindrical battery cell. A cylindrical battery cell may be, for example, a 46110 cell, a 48750 cell, a 48110 cell, a 48800 cell, or a 46800 cell. In the numerical value indicating the form factor, the first two digits indicate the diameter of the cell, the second two digits indicate the height of the cell, and the last digit 0 indicates that the cross section of the cell is circular.

[0134] The battery cell may be a substantially cylindrical battery cell having a diameter of approximately 46 mm, a height of approximately 110 mm, and an aspect ratio of 0.418.

[0135] A battery cell according to another embodiment may be a substantially cylindrical battery cell having a diameter of approximately 48 mm, a height of approximately 75 mm, and an aspect ratio of 0.640.

[0136] A battery cell according to yet another embodiment may be a substantially cylindrical battery cell having a diameter of approximately 48 mm, a height of approximately 110 mm, and an aspect ratio of 0.436.

[0137] A battery cell according to yet another embodiment may be a substantially cylindrical battery cell having a diameter of approximately 48 mm, a height of approximately 80 mm, and an aspect ratio of 0.600.

[0138] A battery cell according to yet another embodiment may be a substantially cylindrical battery cell having a diameter of approximately 46 mm, a height of approximately 80 mm, and an aspect ratio of 0.575.

[0139] The present disclosure can be applied to battery cells with an aspect ratio of about 0.4 or less, such as 18650 cells, 21700 cells, etc. The diameter of the 18650 cell is about 18 mm, the height is about 65 mm, and the aspect ratio is 0.277. The diameter of the 21700 cell is about 21 mm, the height is about 70 mm, and the aspect ratio is 0.300.

[0140] The battery cell according to this embodiment includes an electrode assembly 20 , current collecting plates 31 , 32 electrically connected to the electrode assembly 20 , and a can 10 accommodating the electrode assembly 20 and the current collecting plates 31 , 32 .

[0141] 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 16 covering an open end provided at one end of the side wall member 11 in the axial direction.

[0142] The bottom member 12 may have a disk shape having a hole formed at the center, and the sidewall member 11 may have a circular tube shape.

[0143] The bottom member 12 and the side wall member 11 can be manufactured by forming a nickel-plated metal sheet on the surface of the steel through a deep drawing process and trimming the side wall member 11 with a punch while holding the front end of the side wall member 11 with a blank holder. Of course, the material of the can 10 is not limited thereto.

[0144] The first electrode terminal 13 may be assembled into the hole. The first electrode terminal 13 may be riveted and fixed to the bottom member 12, with the gasket 14 interposed between the first electrode terminal 13 and the bottom member 12. The gasket 14 is interposed between the first electrode terminal 13 and the bottom member 12 to seal the inside and outside of the can 10, thereby preventing leakage of the electrolyte, and electrically insulating the first electrode terminal 13 and the bottom member 12.

[0145] However, the connection method between the first electrode terminal 13 and the bottom member 12 is not limited thereto. For example, various other fixing methods such as a bolt-nut connection method, a glass sealing method, or a chrome plating and PP-MAH thermal bonding method may also be applied as long as the structure can seal the first electrode terminal 13 and the bottom member 12 to each other and electrically insulate the first electrode terminal 13 and the bottom member 12.

[0146] The 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, the sidewall member 11 connected to the bottom member 12, and the cap 16 connected to the sidewall member 11 explained later may all have the second polarity.

[0147] Therefore, in the battery cell, both the first electrode terminal 13 and the second electrode terminal 15 may be disposed at the end in the axial direction, that is, the closed end provided with the bottom member 12. Then, in the battery cell, both the bus bar connected to the first electrode terminal 13 and the bus bar connected to the second electrode terminal 15 may be located at the upper portion of the battery cell.

[0148] In one example, the first electrode terminal 13 may be a positive terminal, and the second electrode terminal 15 may be a negative terminal, or vice versa.

[0149] The electrode assembly 20 is housed in the can 10. The electrode assembly 20 may be manufactured in a roll-wound shape by preparing Figure 2 As shown in FIG. 1 , a first electrode 21, a second electrode 22 and a diaphragm 28 are extended in the length direction with a predetermined width; Figure 3 The first electrode 21, the separator 28, the second electrode 22 and the separator 28 are stacked in sequence; and then the stack is wound around the winding center axis, as shown in FIG. Figure 4 shown.

[0150] The first electrode 21 may be a positive electrode, and the second electrode 22 may be a negative electrode, or vice versa.

[0151] The first electrode 21 and the second electrode 22 are manufactured in a sheet form. The electrode sheet is manufactured in a form in which an active material layer 24 is coated on the surface of a metal foil 23. The electrode sheet has a coated portion 25 coated with the active material layer 24 and an uncoated portion 26 not coated with the active material layer 24. The positive electrode sheet has the uncoated portion 26 on one side in the width direction, and the negative electrode sheet has the uncoated portion 26 on the other side in the width direction.

[0152] The uncoated portion 26 is exposed or protrudes in the width direction in the laminate. The uncoated portion 26 itself functions as an electrode tab 27.

[0153] The uncoated portion 26 may be grooved at predetermined intervals to form a flag-shaped grooved joint 27 .

[0154] In the embodiment, the slotted joint 27 is shown to have an equilateral trapezoidal shape. However, the shape can be various, such as semicircle, semi-ellipse, triangle, rectangle, parallelogram, etc.

[0155] Furthermore, in the embodiment, the slot joints 27 arranged in the length direction are illustrated as having the same width. However, the width of the slot joint may be gradually or stepwise increased from the winding center toward the outer circumference.

[0156] Furthermore, in the embodiment, the height of the slotted joints 27 gradually increases from the winding center toward the outer circumference. However, the height of these slotted joints can be implemented in a constant or gradually decreasing form.

[0157] Furthermore, in the embodiment, a structure is exemplified in which the slotted joint 27 is deleted in a predetermined section at the centripetal end of the uncoated portion 26 and in a predetermined section at the eccentric end thereof. However, it is of course possible that the slotted joint is not deleted at the centripetal end of the uncoated portion and the slotted joint is not deleted at the eccentric end of the uncoated portion.

[0158] In the electrode assembly 20 in the form of a jellyroll, the slotted joint 27 may be bent and flattened in the radial direction, such as Figure 4 As shown. The slotted joint 27 can be bent inwardly or outwardly in the radial direction. In the embodiment, a structure in which the slotted joint 27 is bent inwardly in the radial direction is exemplified.

[0159] The slotted tabs 27 may be bent one by one in the process of forming the jellyroll type electrode assembly 20 by winding the laminate. Alternatively, the slotted tabs 27 may be bent immediately after the jellyroll type electrode assembly is formed by winding the laminate.

[0160] The slotted joints 27 of the first electrode 21 and the second electrode 22 bent and overlapped in the radial direction as described above may provide planes substantially perpendicular to the axial direction at both axial ends of the electrode assembly 20 .

[0161] Substantially flat surfaces provided by bending the slotted joints 27 exposed at both ends in the axial direction of the electrode assembly 20 may be coupled to the first and second current collecting plates 31 and 32, respectively, as shown in FIG. Figure 5 and Figure 6 shown.

[0162] In the embodiment, it is exemplified that the first current collecting plate 31 is a positive current collecting plate, and the second current collecting plate 32 is a negative current collecting plate. The first current collecting plate 31 may be made of aluminum, and the second current collecting plate 32 may be made of copper.

[0163] The current collecting plates 31 , 32 may be manufactured by stamping, trimming, piercing, or bending a metal sheet.

[0164] Reference Figure 5 The first current collecting plate 31 has a terminal connection portion 312 extending radially from the center, a ring portion 313 connecting the eccentric edge of the terminal connection portion 312 in the circumferential direction, and an electrode connection portion 314 extending centrifugally from the ring portion 313 but not connected to the terminal connection portion 312. The center of the terminal connection portion 312 covers at least a portion of the winding center hollow portion of the electrode assembly 20.

[0165] Before the electrode assembly 20 is inserted into the can 10, the electrode connection portion 314 is joined to the slotted joint 27 of the first electrode 21 of the electrode assembly 20 by laser welding or the like. The welding line of the laser may extend radially.

[0166] Reference Figure 6 , Figure 7 and Fig.16 , the second current collecting plate 32 includes an inner ring 321 defining a hole 322 corresponding to the winding center hollow portion of the electrode assembly 20 and arranged to surround the winding center hollow portion, a first spoke 326 extending radially from the inner ring 321, a second spoke 327 extending radially from the inner ring 321, and an outer ring 328 eccentrically arranged relative to the first spoke 326 and connected to the eccentric end of the second spoke 327. The first spoke 326 and the second spoke 327 are respectively connected to different positions of the inner ring 321 in the circumferential direction, that is, the first position and the second position. In addition, the first spoke 326 and the second spoke 327 are spaced apart from each other in the circumferential direction. In addition, the outer ring 328 is concentric with the inner ring 321 and is radially spaced apart from the inner ring 321 and the first spoke 326.

[0167] The embodiment illustrates that both the inner ring 321 and the outer ring 328 have a closed loop shape, but the shape is not necessarily limited thereto. For example, the inner ring 321 may have a "C" shape, and the outer ring 328 may have a plurality of arc shapes intermittently formed and arranged in the circumferential direction.

[0168] The second current collecting plate 32 includes an electrode joint connecting portion 323 that contacts and is electrically connected to the electrode joint 27 of the second electrode 22 of the electrode assembly 20, a tank connecting portion 324 that contacts and is electrically connected to the tank 10, and a conductive connecting portion 325 that electrically connects the electrode joint connecting portion 323 and the tank connecting portion 324 to each other.

[0169] According to an embodiment, the electrode joint connection portion 323 is shown as being arranged on the first spoke 326, but the arrangement of the electrode joint connection portion 323 is not limited thereto. For example, the electrode joint connection portion 323 can be further arranged on the inner ring 321, specifically at a first position in its circumferential direction.

[0170] According to the embodiment, the tank connection portion 324 is shown to be provided on the outer ring 328. Although the embodiment exemplifies that the tank connection portion 324 is provided completely along the circumferential direction of the outer ring 328, the tank connection portion 324 is not necessarily provided completely along the circumferential direction. For example, the tank connection portion 324 may be provided discontinuously along the circumferential direction of the outer ring 328.

[0171] According to an embodiment, the conductive connection portion 325 is disposed on the second spoke 327. However, the conductive connection portion 325 may be further disposed on the inner ring 321, specifically at a second position in the circumferential direction, or, in complement to the arrangement of the electrode joint connection portion 323, may be further disposed at a third position between the first position and the second position in the circumferential direction.

[0172] In an embodiment, four first spokes 326 and four second spokes 327 are alternately arranged at 90 degree intervals. That is, the spokes 326 and 327 may be arranged at 45 degree intervals. Meanwhile, correspondingly, four electrode tap connection portions 323 are arranged at 90 degree intervals.

[0173] The tank connection portion 324 is disposed further outward in the radial direction than the electrode tap connection portion 323 .

[0174] The electrode joint connection portion 323 and the tank connection portion 324 are arranged to be spaced apart from each other in the radial direction. In addition, the electrode joint connection portion 323 and the conductive connection portion 325 are arranged to be spaced apart from each other in the circumferential direction. Specifically, the first spoke 326 and the outer ring 328 are arranged to be spaced apart from each other in the radial direction, and the first spoke 326 and the second spoke 327 are arranged to be spaced apart from each other in the circumferential direction.

[0175] The spacing area can define a “U” shaped spacing space 329 .

[0176] Therefore, the current movement path in the second current collecting plate 32 can be in the order of the electrode joint connection part 323, the conductive connection part 325 and the tank connection part 324, or in the order of the first spoke 326, the inner ring 321, the second spoke 327 and the outer ring 328, or in the reverse order.

[0177] Similarly, the movement path of the welding heat caused by conduction in the second current collecting plate 32 can be in the order of the tank connection part 324, the conductive connection part 325 and the electrode joint connection part 323, or in the order of the outer ring 328, the second spoke 327, the inner ring 321 and the first spoke 326.

[0178] Before placing the electrode assembly 20 into the can 10, the electrode joint connection portion 323 of the second current collecting plate 32 may be joined with the slotted joint 27 of the second electrode 22 of the electrode assembly 20 by a laser welding method, etc. The welding line of the laser may extend radially.

[0179] According to an embodiment, a welding insulation member may be interposed between the second current collecting plate 32 and the electrode assembly 20 to prevent welding heat of the sidewall member 11 and the cap 16 explained later from affecting the separator 28 of the electrode assembly 20. The welding insulation member may be the insulating member 18.

[0180] The insulating member 18 is preferably a material that does not react with the electrolyte and has high heat resistance. The insulating member 18 may be a polymer material. The insulating member 18 may be polycarbonate (PC), polyethylene naphthalate (PEN), polyetheretherketone (PEEK), and polyethylene terephthalate (PET).

[0181] Reference Figure 6 , Figure 7 and Figures 16 to 20 , the insulating member 18 is interposed between the second current collecting plate 32 and the electrode assembly 20 in the axial direction.

[0182] The insulating member 18 may include an outer ring 181 and a centripetally extending portion 182 extending inwardly in a radial direction from the outer ring 181 .

[0183] The centripetally extending portion 182 may extend inwardly by a predetermined distance (d) from the radially outer edge of the insulating member 18 .

[0184] The insulating member 18 may have a shunting groove 185 formed by deleting a portion corresponding to the electrode tap connection portion 323 of the second current collecting plate 32. Four shunting grooves 185 may also be provided at 90 degree intervals to correspond to the second current collecting plate of the embodiment.

[0185] When the insulating member 18 is inserted between the second current collecting plate 32 and the electrode assembly 20, the outer ring 181 of the insulating member 18 covers a portion of the spacing space 329 and the outer ring 328 of the second current collecting plate 32, and the centripetally extending portion 182 of the insulating member 18 covers the remaining portion of the spacing space 329 and the second spoke 327 of the second current collecting plate 32.

[0186] When a portion of the insulation member 18 covering the outer ring 328 of the second current collecting plate 32 is referred to as a circumferentially extending cover portion 186 , the circumferentially extending cover portion 186 may be defined by a portion of the outer ring 181 .

[0187] In addition, when a portion of the insulation member 18 covering the second spokes 327 of the second current collecting plate 32 is referred to as a radially extending cover portion 184 , the radially extending cover portion 184 may be defined by a portion of the centripetally extending portion 182 .

[0188] In addition, when a portion of the insulation member 18 covering the interval space 329 of the second current collecting plate 32 is referred to as an interval space covering portion 183 , the interval space covering portion 183 may be defined by a remaining portion of the outer ring 181 and a remaining portion of the centripetally extending portion 182 .

[0189] In other words, the outer ring 328 of the second current collecting plate 32 is covered by the outer ring 181 of the insulating member 18 , the second spokes 327 of the second current collecting plate 32 are covered by the centripetal extension 182 of the insulating member 18 , and the spacing spaces 329 of the second current collecting plate 32 are covered by the outer ring 181 and the centripetal extension 182 of the insulating member 18 .

[0190] The insulating member 18 is interposed between the second current collecting plate 32 and the electrode assembly 20 in the axial direction, and the first spoke 326 or the electrode joint connection portion 323 of the second current collecting plate 32 is joined to the electrode joint 27 of the second electrode 22 of the electrode assembly 20 in a state where the avoidance groove 185 of the insulating member 18 is aligned with the first spoke 326 or the electrode joint connection portion 323 of the second current collecting plate 32. The joining can be achieved by irradiating a laser onto the surface of the electrode joint connection portion 323, and the laser can be irradiated in a manner of scanning in the radial direction. The laser scanning can be performed multiple times and can be performed at multiple positions spaced apart in the circumferential direction, respectively.

[0191] When welding the electrode tab connection portion 323, welding is performed while applying pressure to the first spoke 326 toward the electrode tab 27, so that the first spoke 326 can be elastically deformed in the axial direction from the inner ring 321 and closely contact the electrode tab 27. Therefore, the first spoke 326 or the electrode tab connection portion 323 can be assembled into the avoidance groove 185 of the insulating member 18.

[0192] Then, since the circumferential surface of the first spoke 326 interferes with the circumferential surface of the avoidance groove 185, in a state where the electrode joint connecting portion 323 and the electrode joint 27 of the electrode assembly 20 are welded, as shown in FIG. Figure 7 The position of the insulating member 18 is adjusted as shown.

[0193] like Fig. 9 and Fig.10 As shown, the electrode assembly 20 is accommodated in the can 10 in a state where the first current collecting plate 31 is aligned to face the bottom member 12 of the can 10. At this time, an insulator 19 is interposed between the first current collecting plate 31 and the bottom member 12 of the can 10 to electrically insulate the first current collecting plate 31 and the bottom member 12.

[0194] In addition, the terminal connection portion 312 of the first current collecting plate 31 is joined to the first electrode terminal 13 fixed to the can 10 by resistance welding, ultrasonic welding, laser welding, etc. The welding device for welding the first current collecting plate 31 and the first electrode terminal 13 can pass through the winding center hollow portion of the electrode assembly 20 from the open end of the can 10 and approach the back side of the center of the terminal connection portion 312 of the first current collecting plate 31 for welding. Of course, the first current collecting plate 31 and the first electrode terminal 13 can also be joined by brazing or soldering. In other words, as long as the first current collecting plate 31 and the first electrode terminal 13 can be electrically connected and fixed to each other, various methods can be used.

[0195] In a state where the electrode assembly 20 is accommodated inside the can 10 and the first current collecting plate 31 is engaged with the first electrode terminal 13 , the electrode tab 27 of the second electrode 22 and the second current collecting plate 32 are arranged to face the open end of the sidewall member 11 .

[0196] In this state, if Figures 10 to 12 As shown, the open end of the can 10 is covered by the cap 16, and the edge of the cap 16 is welded to the edge of the side wall member 11 and the second current collecting plate 32. In addition, the electrolyte is injected into the can 10 through the injection hole 162 of the cap 16.

[0197] After injecting electrolyte, Fig.13 As shown, the battery cell is completely assembled by covering and sealing the injection hole 162 of the cap 16 with the plug 164 .

[0198] Unlike the illustrated embodiment, in a structure in which an injection hole is not provided in the cap 16, the battery cell can be completely assembled in the following manner: before covering the open end of the can 10 with the cap 16, the electrolyte is first injected into the can 10, and then the open end of the can 10 is covered with the cap 16, and the edge of the cap 16 is welded to the edge of the side wall member 11 and the second current collecting plate 32.

[0199] like Fig.14 As shown, the portion where the edge of the side wall member 11 and the edge of the cap 16 meet is exposed outward in the axial direction. The laser for seam welding this portion can be irradiated to the portion where the edge of the side wall member 11 and the edge of the cap 16 meet in the axial direction. In addition, the portion irradiated with the laser can be relatively moved in the circumferential direction of the tank 10, so that the welded portion W can be continuously formed.

[0200] In the battery cell, a weld portion W is formed at an abutment area of ​​the side wall member 11 , the cap 16 , and the second current collecting plate 32 .

[0201] like Fig.15 As shown, in the process of forming the welded portion W, welding heat is conducted along the side wall member 11 and also conducted along the second current collecting plate 32 .

[0202] The second current collecting plate 32 may be made of a material having a higher thermal conductivity than the side wall member 11, such as copper. In addition, the second current collecting plate 32 is in contact with the side wall member 11. Therefore, when the welding heat generated by the laser in the side wall member 11 is conducted along the axial direction of the side wall member 11, the welding heat is distributed to the electrode assembly 20 through the second current collecting plate 32, thereby preventing the welding heat from being conducted along the side wall member 11 in the axial direction and being transferred to the diaphragm 28 at the outer peripheral surface of the electrode assembly 20 facing the inner peripheral surface of the side wall member 11, thereby damaging the diaphragm 28 of the corresponding portion.

[0203] In addition, the welding heat conducted to the second current collecting plate 32 moves along the outer ring 328, the second spoke 327, the inner ring 321 and the electrode joint connecting portion 323 of the second current collecting plate 32. In addition, as the welding heat moves, its temperature gradually decreases. At this time, since the insulating member 18 is inserted between the outer ring 328 and the second spoke 327 of the second current collecting plate 32 with relatively high temperatures and the electrode assembly 20, it is possible to prevent high-temperature heat from being transferred to the inside of the electrode assembly 20 through the electrode joint 27 and affecting the front axial end of the diaphragm 28.

[0204] According to an embodiment, since the insulating member 18 extends a predetermined distance (d) from the outer radial edge, the inner ring 321 may not be covered. In addition, the insulating member 18 may be configured not to cover the electrode joint connection portion 323 through the avoidance groove 185. Since the temperature of the welding heat reaching the inner ring 321 and the electrode joint connection portion 323 by conduction is relatively low, there is no need to worry that the heat transferred to the electrode assembly 20 will damage the diaphragm 28.

[0205] Meanwhile, the insulating member 18 covers the spacing space 329 of the second current collecting plate 32 between the second current collecting plate 32 and the electrode assembly 20 . Therefore, a portion of the electrode assembly 20 corresponding to the spacing space 329 is covered by the insulating member 18 .

[0206] Since the outer ring 328 of the second current collecting plate 32 is very close to the region where welding heat is generated, there is a problem that heat radiated from the heated outer ring 328 may be transferred to the electrode assembly 20 corresponding to the above region through the separation space 329 .

[0207] However, according to the embodiment, since the insulating member 18 covers the electrode assembly 20 , the radiant heat is shielded so that the radiant heat does not damage the separator 28 of the electrode assembly 20 .

[0208] In the following, reference is made to Fig.21 , describing a method for manufacturing the above-mentioned battery cell.

[0209] According to the method of manufacturing a battery cell, first, a can 10 is prepared in which the first electrode terminal 13 is fixed to the bottom member 12, and an electrode assembly 20 is prepared in which the first current collecting plate 31 and the second current collecting plate 32 are respectively joined to both axial ends. At this time, an insulating member 18 is interposed between the second current collecting plate 32 and the electrode assembly 20.

[0210] In addition, the electrode assembly 20 is inserted and accommodated in the can 10, wherein the first current collecting plate 31 faces the bottom member 12. Then, the second current collecting plate 32 is located at the open end of the can 10. In the process of accommodating the electrode assembly 20 in the can 10, the radial outer edge of the second current collecting plate 32 is brought into contact with the inner circumferential surface of the sidewall member 11.

[0211] Next, the first current collecting plate 31 is joined to the first electrode terminal 13 .

[0212] Furthermore, the open end of the side wall member 11 is covered with the cap 16 , and the edge of the cap 16 is brought into contact with the inner peripheral surface of the side wall member 11 and the upper end of the edge of the second current collecting plate 32 .

[0213] Next, the laser is irradiated to the butt joint portion of the inner circumference of the side wall member 11 and the outer circumference of the cap 16, so that the side wall member 11, the cap 16 and the tank connection portion 324 of the second current collecting plate 32 are welded together. Therefore, the welding portion W joins all the side wall members 11, the cap 16 and the second current collecting plate 32.

[0214] At this time, the overhanging portion 117 of the side wall member 11 protruding further outward in the axial direction than the cap 16 is welded to the welding area of ​​the inner peripheral surface of the side wall member 11 and the outer peripheral surface of the cap 16 to ensure a sufficient welding pool.

[0215] Although the energy density of the laser is high, the second current collecting plate 32 has a high thermal conductivity, so that the high temperature heat can be prevented from being transferred to the diaphragm 28 at the outer peripheral surface of the electrode assembly 20 through the side wall member 11 and damaging the diaphragm 28. In addition, since the insulating member 18 covers the electrode assembly 20, the welding heat transferred through the second current collecting plate 32 does not affect the diaphragm 28 of the electrode assembly 20.

[0216] After the seam welding is completed as described above, the electrolyte is injected into the interior of the can 10 through the injection hole 162 of the cap 16 .

[0217] After the electrolyte is completely injected, the injection hole 162 of the cap 16 is covered and sealed by the plug 164. Since the plug 164 can be sealed using a known technique, a detailed description is omitted.

[0218] At the same time, in the following, reference Fig. 22 , another embodiment of a method for manufacturing the above-mentioned battery cell is described.

[0219] First, the can 10 is prepared with the first electrode terminal 13 fixed to the bottom member 12, and the electrode assembly 20 is prepared with the first and second current collecting plates 31 and 32 respectively joined to both axial ends. At this time, the insulating member 18 is interposed between the second current collecting plate 32 and the electrode assembly 20.

[0220] In addition, the electrode assembly 20 is inserted and accommodated in the can 10 so that the first current collecting plate 31 faces the bottom member 12. Then, the second current collecting plate 32 is located at the open end of the can 10. In the process of accommodating the electrode assembly 20 in the can 10, the radial outer edge of the second current collecting plate 32 is brought into contact with the inner circumferential surface of the sidewall member 11.

[0221] Next, the first current collecting plate 31 is joined to the first electrode terminal 13 .

[0222] In this state, the electrolyte is injected into the can 10 through the open end of the can 10 .

[0223] After the electrolyte is completely injected, the open end of the sidewall member 11 is covered with the cap 16 so that the edge of the cap 16 contacts the inner circumferential surface of the sidewall member 11 and the upper end of the edge of the second current collecting plate 32 .

[0224] Next, the laser is irradiated to the butt joint portion of the inner circumference of the side wall member 11 and the outer circumference of the cap 16, so that the side wall member 11, the cap 16 and the tank connection portion 324 of the second current collecting plate 32 are welded together. Therefore, the welding portion W joins all the side wall members 11, the cap 16 and the second current collecting plate 32.

[0225] like Fig.23As shown, the battery cell 72 manufactured by the above welding structure and welding process can be accommodated in the housing 71 of the battery pack 70. As shown, the battery pack 70 can be configured using a battery module as an intermediate assembly form, or the battery pack 70 can be directly configured without a battery module.

[0226] Since the battery cell 72 itself has a large volume, there is no particular difficulty in realizing the battery pack 70 even without using an intermediate structure called a battery module. In addition, the battery cell 72 has a lower internal resistance and a higher energy density. Therefore, the energy density of the battery pack 70 equipped with the battery cell 72 can be realized even higher.

[0227] The battery pack 70 with increased energy density can store the same amount of energy while reducing its volume and load. Fig.24 In vehicles such as vehicle 80 shown using electricity as an energy source, the vehicle's mileage per energy can be further increased.

[0228] It should be understood that the above embodiments are illustrative in all aspects and not restrictive, and the scope of the present disclosure will be limited by the appended claims rather than the above detailed description. In addition, the meaning and scope of the appended claims, as well as all changes and modifications that can be derived from their equivalent concepts, should be interpreted as included in the scope of the present disclosure.

[0229] Although the present disclosure has been described with reference to the example drawings, the present disclosure is not limited to the embodiments and drawings disclosed in this specification, and it is obvious that those skilled in the art can make various modifications within the scope of the technical idea of ​​the present disclosure. In addition, even if the effect of the configuration according to the present disclosure is not clearly described and explained when explaining the embodiments of the present disclosure, it is obvious that the effect that can be predicted by the configuration should be recognized.

Claims

1. A battery cell, comprising: a can comprising a bottom member, a side wall member connected to the bottom member and extending from the bottom member to one side in an axial direction, and a cap covering an open end of the side wall member provided at one end in the axial direction; and an electrode assembly accommodated inside the can, wherein the current collecting plate is connected to an electrode tap disposed at a second end located at the open end of the can among the first end and the second end located at both axial sides of the electrode assembly, Wherein, the current collecting plate comprises: an electrode connector connecting portion, the electrode connector connecting portion being in contact with the electrode connector and being electrically connected to the electrode connector; a tank connection portion disposed more outwardly than the electrode tab connection portion in a radial direction and in contact with and electrically connected to the tank; and a conductive connecting portion, the conductive connecting portion electrically connecting the tank connecting portion with the electrode connector connecting portion, wherein the periphery of one end of the side wall member and the outer periphery of the cap in the radial direction are seam welded along the circumferential direction, and Wherein, at least a portion of the insulating member is interposed between the current collecting plate and the electrode assembly along the axial direction.

2. The battery cell according to claim 1, in, At least a portion of the insulating member is disposed outside the electrode tab connecting portion in the radial direction.

3. The battery cell according to claim 1, in, At least a portion of the insulating member is disposed between two electrode tap connection portions adjacent to each other in the circumferential direction.

4. The battery cell according to claim 1, in, At least a portion of the insulating member is disposed between the can connection portion and the electrode assembly in the axial direction.

5. The battery cell according to claim 1, in, The insulating member covers a space between the electrode tap connection portion and the can connection portion in the radial direction.

6. The battery cell according to claim 1, in, The insulating member covers a space between the electrode tab connection portion and the conductive connection portion in the circumferential direction.

7. The battery cell according to claim 1, in, The insulating member is disposed outside a space between the electrode tap connection portion and the electrode assembly in the axial direction.

8. The battery cell according to claim 1, in, The current collecting plate comprises: a surrounding inner ring defining an aperture facing a wound central hollow portion of the electrode assembly; at least one first spoke and at least one second spoke, the at least one first spoke and the at least one second spoke extending outwardly from the inner ring in the radial direction and spaced apart from each other in a circumferential direction; and an outer ring extending in the radial direction to the outside of the inner ring to surround the inner ring, Wherein, the outer ring is spaced apart from the first spoke and connected to the second spoke.

9. The battery cell according to claim 8, in, The outer ring has a closed loop shape.

10. The battery cell according to claim 8, in, The electrode connector connection portion is at least arranged on the first spoke, Wherein, the conductive connection portion is at least arranged on the second spoke, and Wherein, the tank connecting part is arranged on the outer ring.

11. The battery cell according to claim 8, in, At least a portion of the insulating member is disposed outside the first spoke in the radial direction.

12. The battery cell according to claim 8, in, At least a portion of the insulating member is disposed between the first spokes in the circumferential direction.

13. The battery cell according to claim 8, in, At least a portion of the insulating member is disposed between the second spoke and the electrode assembly in the axial direction.

14. The battery cell according to claim 8, in, At least a portion of the insulating member is disposed between the outer ring and the electrode assembly in the axial direction.

15. The battery cell according to claim 8, in, The insulating member is disposed outside a space between the first spoke and the electrode assembly in the axial direction.

16. The battery cell according to claim 8, in, The insulating member covers a space between the first spoke and the outer ring in the radial direction.

17. The battery cell according to claim 8, in, The insulating member covers a space between the first spoke and the second spoke in the circumferential direction.

18. The battery cell according to claim 8, in, The insulating member covers a space between the inner ring and the outer ring in the radial direction.

19. The battery cell according to claim 1, in, The insulating member includes a high heat-resistant polymer material.

20. The battery cell according to claim 19, in, The insulating member is substantially chemically stable to the electrolyte injected into the can.

21. The battery cell according to claim 19, in, The insulating member does not substantially react with the electrolyte.

22. The battery cell according to claim 19, in, The insulating member includes at least one of PC, PEN, PEEK, and PET.

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