Battery cell, battery pack, and vehicle comprising the same

Abstract

A battery cell according to the present application includes: an electrode assembly disposed when wound around a center axis of a winding center hole with a separator interposed between a first electrode and a second electrode; a can case accommodating the electrode assembly and having an opening portion at one end portion of the can case; and a can lead including a plurality of electrode coupling portions coupled to the electrode assembly and spaced apart from each other, and coupled to the one end portion of the can case, wherein each of the plurality of electrode coupling portions is provided with a welding coupling portion that is a portion to be welded to the electrode assembly and is configured such that a first width in a direction perpendicular to a radial direction is greater than or equal to a second width in the radial direction.

Description

Technical Field

[0001] This disclosure relates to battery cells, battery packs, and vehicles including such battery packs, and more specifically, to battery cells, battery packs, and vehicles including such battery packs with improved solderability.

[0002] This application is based on and claims priority to Korean Patent Application No. 10-2025-0011781, filed with the Korean Intellectual Property Office on January 24, 2025, the disclosure of which is incorporated herein by reference in its entirety. Background Technology

[0003] Recently, the demand for portable electronic products such as laptops, cameras, and mobile phones has increased rapidly, and the development of electric vehicles, energy storage batteries, robots, satellites, and other related technologies has accelerated. Therefore, active research is underway on high-performance rechargeable batteries.

[0004] Currently, commercially available rechargeable batteries include nickel-cadmium (NiCd) batteries, nickel-metal hydride (NiMH) batteries, nickel-zinc (NiZn) batteries, and lithium-ion batteries. Among these, lithium-ion batteries have attracted much attention compared to nickel-based batteries due to their advantages of almost no memory effect allowing for flexible charging and discharging, very low self-discharge rate, and high energy density.

[0005] These lithium-ion secondary batteries typically use lithium-based oxides and carbon materials as the positive and negative electrode active materials, respectively. Furthermore, a lithium-ion secondary battery includes an electrode assembly and an outer casing. The electrode assembly contains a positive electrode plate and a negative electrode plate, respectively coated with the positive and negative electrode active materials, and a separator is located between the positive and negative electrode plates. The outer casing stores the electrode assembly and electrolyte in a sealed manner.

[0006] Furthermore, based on the shape of the battery casing, lithium-ion secondary batteries can be divided into pouch-type secondary batteries where the electrode assembly is housed in a pouch of aluminum laminate, and can-type secondary batteries where the electrode assembly is housed in a metal can. Additionally, based on the shape of the metal can, can-type secondary batteries can be further divided into cylindrical batteries and prismatic batteries. Lithium-ion secondary batteries are used as battery modules or battery packs, which are obtained by overlapping or stacking multiple battery cells into a dense structure to provide high voltage and high current and then electrically connecting them.

[0007] A battery cell may include an electrode assembly and a can housing that houses the electrode assembly, wherein the electrode assembly is arranged with electrodes and a separator inserted between the electrodes wound together. Additionally, a conventional battery cell may include a crimped portion and a crimped portion. The crimped portion is formed to be recessed into the side of the opening of the can housing to secure the electrode assembly and adjust the shape factor of the battery cell, and the crimped portion is bent and extended to seal the opening.

[0008] In addition, in recent years, in order to improve space efficiency, energy density and productivity, battery cells that do not include parts such as crimped portions and press-fit portions (hereinafter referred to as conventional battery cells) have been developed. Such conventional battery cells may include components such as can caps that are connected to the end of the opening of the can housing.

[0009] The can lid can be configured to be welded to the electrode assembly. However, in conventional battery cells, the can lid is difficult to make close contact with the electrode assembly due to its tilt or uneven flatness, thus posing a high risk of welding defects such as over-welding or under-welding, and potentially resulting in low weld strength due to insufficient weld area. Therefore, there is an urgent need to develop a battery cell that includes a can lid and has improved weldability. Summary of the Invention

[0010] Technical issues

[0011] This disclosure is designed to address problems in the related art, and therefore aims to provide a battery cell, battery pack, and vehicle including the battery pack with improved solderability.

[0012] The technical problems sought to be solved by this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description of the invention that are not mentioned above.

[0013] Technical solution

[0014] In one aspect of this disclosure, a battery cell is provided, comprising: an electrode assembly configured by winding the first and second electrodes around a central axis of a winding central hole with a diaphragm inserted between the first and second electrodes; a can housing housing the electrode assembly and having an opening formed at one end of the can housing; and a can lid having a plurality of electrode coupling portions coupled to the electrode assembly and spaced apart from each other, the can lid being coupled to one end of the can housing, wherein each of the plurality of electrode coupling portions includes a welded coupling portion welded to the electrode assembly, the welded coupling portion being configured such that a first width in a direction perpendicular to the radial direction is greater than or equal to a second width in the radial direction.

[0015] The welded joint can be formed over the entire area of ​​the electrode joint.

[0016] The welded joint can be designed to be flat.

[0017] It can be equipped with three electrode connection parts.

[0018] Multiple electrode connections can be formed and arranged in a radially rotationally symmetrical manner.

[0019] The can lid may also include a plurality of spacers disposed between any two adjacent electrode connections and spaced apart from the electrode assembly.

[0020] When viewed along the central axis of the winding central hole, the total area of ​​the welded joint can be larger than the total area of ​​the spacer.

[0021] The can lid may also include: an injection port that opens toward the interior of the can housing; and a flat portion that surrounds the injection port and is spaced apart from the electrode assembly.

[0022] The flat portion may include a curved portion recessed toward the injection port side, and the electrode connection portion may also include a first extension extending toward the curved portion.

[0023] The electrode connection portion may also include a second extension portion extending in the circumferential direction.

[0024] The can lid may also include a plurality of bridging elements that extend radially and are configured to separate any two adjacent electrode connection portions.

[0025] The can lid may also include an edge portion formed at the edge of the can lid to connect to the can body, and the edge portion may be configured to be deformable in a direction parallel to the radial direction.

[0026] The can lid may also include an exhaust vent formed by making a cut between the edge of the can lid and the electrode connection portion.

[0027] In another aspect of this disclosure, a battery pack is provided, the battery pack including at least one battery cell according to this disclosure.

[0028] In another aspect of this disclosure, a vehicle is provided that includes at least one battery pack according to this disclosure.

[0029] Beneficial effects

[0030] According to this disclosure, battery cells with improved solderability, battery packs, and vehicles including the battery packs can be provided.

[0031] Furthermore, according to one aspect of this disclosure, battery cells, battery packs, and vehicles including the battery packs with improved quality can be provided.

[0032] Furthermore, according to one aspect of this disclosure, battery cells, battery packs, and vehicles including the battery packs can be provided with improved structural rigidity and stability.

[0033] Furthermore, according to one aspect of this disclosure, a battery cell with low resistance, a battery pack, and a vehicle including the battery pack can be provided.

[0034] Furthermore, according to one aspect of this disclosure, battery cells with improved energy density, battery packs, and vehicles including the battery packs can be provided.

[0035] Furthermore, according to one aspect of this disclosure, battery cells, battery packs, and vehicles including the battery packs can be provided with improved productivity.

[0036] Furthermore, according to one aspect of this disclosure, battery cells capable of effectively venting gas, battery packs, and vehicles including the battery packs can be provided.

[0037] Furthermore, according to one aspect of this disclosure, battery cells, battery packs, and vehicles including the battery packs can be provided that are easy to modify in design.

[0038] The effects that can be obtained from this disclosure are not limited to those described above, and other effects not mentioned above will be clearly understood by those skilled in the art from the following description of the invention. Attached Figure Description

[0039] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, serve to provide a further understanding of the technical features of the present disclosure; therefore, the present disclosure is not to be construed as limited to the drawings.

[0040] Figure 1 This is a perspective view showing the overall configuration of a battery cell according to an embodiment of the present disclosure.

[0041] Figure 2 This is a side cross-sectional view showing a battery cell according to an embodiment of the present disclosure.

[0042] Figure 3 This is a perspective view showing a can lid according to an embodiment of the present disclosure.

[0043] Figure 4 This is a plan view showing a can lid according to an embodiment of the present disclosure.

[0044] Figure 5 It shows along Figure 4 A side section view of a portion of the cross section cut by line AA'.

[0045] Figure 6 This is a plan view showing the can lid of a conventional battery cell.

[0046] Figure 7 This is a plan view showing an example of a can lid according to an embodiment of the present disclosure.

[0047] Figure 8 It shows along Figure 4 A side section view of another part of the section cut by line AA'.

[0048] Figure 9 This is a plan view showing a can lid according to another embodiment of the present disclosure.

[0049] Figure 10 This is a plan view showing various can lids according to embodiments and variations thereof of this disclosure.

[0050] Figure 11 This is a side cross-sectional view showing various can lids according to embodiments and variations thereof.

[0051] Figure 12 This is a diagram illustrating a battery pack according to an embodiment of the present disclosure.

[0052] Figure 13 This is a diagram illustrating a vehicle according to an embodiment of the present disclosure. Detailed Implementation

[0053] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before the description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general or dictionary meaning, but rather is interpreted according to the meaning and concept corresponding to the technical aspects of the present disclosure, based on the principle that inventors are allowed to appropriately define terms for the best interpretation.

[0054] Therefore, the description presented herein is merely a preferred example for illustrative purposes only and is not intended to limit the scope of this disclosure. It should be understood that other equivalents and modifications may be made thereto without departing from the scope of this disclosure.

[0055] In this specification, unless otherwise stated, the X-axis and Y-axis directions may correspond to the left-right and front-back directions, or the front-back and left-right directions, respectively, and the Z-axis direction, which is perpendicular to the XY plane, may correspond to the up-down direction (vertical direction).

[0056] Figure 1 This is a perspective view showing the overall configuration of a battery cell according to an embodiment of the present disclosure, and Figure 2 This is a side cross-sectional view showing a battery cell according to an embodiment of the present disclosure.

[0057] Reference Figure 1 and Figure 2 According to embodiments of the present disclosure, the battery cell 10 may include an electrode assembly 100, a can housing 200, and a can lid 300.

[0058] Electrode assembly 100 may have electrodes 110 and diaphragm 120. Electrodes 110 may include electrodes with different polarities. Specifically, electrodes 110 may include a first electrode 110a and a second electrode 110b. The first electrode 110a may have a first polarity, and the second electrode 110b may have a second polarity opposite to the first polarity. For example, the first polarity may be positive, and the second polarity may be negative. Diaphragm 120 may be inserted between electrodes 110 with different polarities. Diaphragm 120 may be inserted between the first electrode 110a and the second electrode 110b. Diaphragm 120 may be an insulator.

[0059] The electrode assembly 100 may have a core structure. That is, the electrode assembly 100 can be manufactured by winding a laminate around the central axis of the winding center hole C, the laminate being formed by stacking the first electrode 110a and the second electrode 110b at least once with the diaphragm 120 inserted between the sheet-like first electrode 110a and the sheet-like second electrode 110b. Any core structure known in the art can be applied to this disclosure without limitation.

[0060] The can housing 200 can accommodate the electrode assembly 100. The can housing 200 can be configured, for example, as a cylindrical shape with an empty interior to accommodate the electrode assembly 100. A closure 21 can be provided on one side of the can housing 200 (e.g., the +Z direction side or the upper side). A closure 220 can be formed on the other side of the can housing 200 (e.g., the -Z direction side or the lower side).

[0061] The lid 300 can be attached to the opening 210. The lid 300 can be welded to the opening 210. The edge of the lid 300 can be welded and attached to the end of the can body 200 that forms the opening 210. The lid 300 can cover the opening 210 of the can body 200.

[0062] Furthermore, the battery cell 10 according to embodiments of this disclosure may also include electrode terminals 400. Electrode terminals 400 may be electrically connected to electrode assembly 100. For example, electrode terminals 400 may be electrically connected to a first electrode 110a. Electrode terminals 400 may be configured to pass through the closure 220. Electrode terminals 400 may be formed such that at least a portion of them is exposed outside the can housing 200, and another portion protrudes into the can housing 200. Electrode terminals 400 may be provided in the form of rivets.

[0063] Figure 3 This is a perspective view showing a can lid according to an embodiment of the present disclosure. Figure 4 This is a plan view showing a can lid according to an embodiment of the present disclosure. Figure 5 It shows along Figure 4 A side section view of a portion of the cross section intercepted by line AA'. Figure 6 It is a plan view showing the can lid of a conventional battery cell, and Figure 7 This is a plan view showing an example of a can lid according to an embodiment of the present disclosure.

[0064] In the following text, reference will be made to Figures 3 to 5 A detailed description of the battery cell 10 according to an embodiment of the present disclosure.

[0065] The can lid 300 may include an electrode connection portion 310. The electrode connection portion 310 may be connected to the electrode assembly 100. The electrode connection portion 310 may be soldered and connected to the electrode assembly 100.

[0066] The can lid 300 may include a plurality of electrode connections 310. The plurality of electrode connections 310 may be spaced apart from each other. For example, the plurality of electrode connections 310 may be spaced apart from each other in a circumferential direction.

[0067] Each of the plurality of electrode connection portions 310 may include a weld connection portion WL. The weld connection portion WL may be a portion of the can cap 300 to be welded to the electrode assembly 100. The weld connection portion WL may be welded to the second electrode 110b of the electrode assembly 100. In this regard, an uncoated portion of unlaminated active material may be formed at the upper end of the second electrode 110b, the uncoated portion may include, for example, a plurality of foil tabs with notches, and the weld connection portion WL may be welded to and connected to at least some of the plurality of foil tabs. The weld connection portion WL may be formed on the lower surface of the electrode connection portion 310 facing the upper end of the electrode assembly 100.

[0068] The welded joint WL can be configured such that the length of the first width W1 is greater than or equal to the length of the second width W2.

[0069] The first width W1 can refer to the width in the direction perpendicular to the radial direction. For example, in a welded joint WL, when the width in the direction perpendicular to the radial direction is uniformly formed along the radial direction, the width in the direction perpendicular to the radial direction can be referred to as the first width W1. Furthermore, for example, in a welded joint WL, when the width in the direction perpendicular to the radial direction is not uniformly formed along the radial direction, the width in the direction perpendicular to the radial direction at the center point of the second width W2 (explained below) can be referred to as the first width W1.

[0070] The second width W2 can refer to the width along the radial direction. The second width W2 can be, for example, the width from the inside to the outside in the radial direction. When the can lid 300 includes the flat portion 350 and the vent cut-out portion 380 as described below, the second width W2 can be formed to be slightly smaller than the radial length from the flat portion 350 to the vent cut-out portion 380.

[0071] The welded joint WL can be formed such that the length of the first width W1 is equal to the length of the second width W2, or the length of the first width W1 can be greater than the length of the second width W2.

[0072] In the battery cell 10 according to an embodiment of the present disclosure, since the can cap 300 includes a plurality of electrode connection portions 310, tilting relative to the electrode assembly 100 or uneven flatness relative to the electrode assembly 100 can be effectively prevented. Therefore, the can cap 300 and the electrode assembly 100 can be made into tight contact uniformly and effectively, thereby significantly preventing welding defects such as over-soldering or under-soldering between the can cap 300 and the electrode assembly 100.

[0073] Furthermore, in the battery cell 10 according to the embodiments of this disclosure, since the first width W1 and the second width W2 of the welded joint WL are formed as described above, the area of ​​the welded joint WL (that is, the welded area between the can cap 300 and the electrode assembly 100) can be sufficiently ensured to be large. Therefore, the weld strength between the can cap 300 and the electrode assembly 100 can be sufficiently ensured to be high.

[0074] As described above, in the battery cell 10 according to the embodiments of the present disclosure, welding defects between the can cap 300 and the electrode assembly 100 can be significantly prevented, and the welding area and welding strength can be sufficiently ensured, thereby significantly improving weldability.

[0075] When the solderability is improved as described above, the quality of the battery cell 10 can also be improved, as well as the structural rigidity and stability of the battery cell 10.

[0076] Furthermore, in the battery cell 10 according to the embodiments of the present disclosure, since the welding area between the can cap 300 and the electrode assembly 100 is sufficiently ensured, the resistance of the battery cell 10 can be formed to be low.

[0077] Furthermore, in the battery cell 10 according to the embodiments of this disclosure, since portions such as conventional rolled edges are not included, the internal space efficiency of the battery cell 10 can be improved, thereby increasing the energy density. Moreover, since a separate rolled edge process or pressing process is not required, the productivity of the battery cell 10 can be improved.

[0078] In addition, refer to Figure 6 and Figure 7 A comparison will be made between conventional battery cells 10' and 10'' and battery cell 10 according to an embodiment of the present disclosure.

[0079] Reference Figure 6(a) The electrode connection portion 310' provided in the can cap 300' of a conventional battery cell 10' can be configured as a single unit instead of multiple units, and in this case, the welding area of ​​the can cap 300' can be sufficiently ensured, but it is difficult to prevent the can cap 300' from tilting or the can cap 300' from having uneven flatness. Furthermore, referring to... Figure 6 (b) When the can cap 300'' of another conventional battery cell 10'' includes multiple electrode connection portions 310'', wherein the length of the first width W1 is less than the length of the second width W2, the tilt of the can cap 300'' or the uneven flatness of the can cap 300'' can be effectively reduced, but there is a disadvantage that sufficient welding area cannot be ensured.

[0080] Figure 7 (a) shows a can lid 300 according to an embodiment of the present disclosure, and Figure 7 (b) shows the relationship with Figure 7 (a) is a case where the can lid 300 is further increased in width compared to the first width W1. For example... Figure 7 As shown, compared with the conventional battery cells 10' and 10'' described above, the battery cell 10 according to the embodiments of this disclosure can effectively reduce the tilt of the can cover 300 or the uneven flatness of the can cover 300, while ensuring sufficient welding area.

[0081] Reference Figures 3 to 5 The weld joint WL can be formed over the entire area of ​​the electrode connection portion 310. Therefore, when viewed in the vertical direction, the shape of the weld joint WL can correspond to the shape of the electrode connection portion 310. For example, the weld joint WL can be formed on the entire lower surface of the electrode connection portion 310.

[0082] When the welded joint WL is formed as described above, the welding area between the can lid 300 and the electrode assembly 100 can be maximized.

[0083] The welded joint WL can be configured to be flat. The lower surface of the electrode joint 310 on which the welded joint WL is formed can be configured to be flat.

[0084] When the welded joint WL is formed as described above, the flatness between the can cap 300 and the electrode assembly 100 can be formed more uniformly, and the can cap 300 can contact the electrode assembly 100 more closely, thereby further improving the weldability of the battery cell 10.

[0085] Reference Figure 3 and Figure 4 Three electrode connection parts 310 can be provided.

[0086] In this case, because the three electrode connections 310 can be easily formed into a plane, tilting between the can lid 300 and the electrode assembly 100 or uneven flatness between them can be significantly prevented.

[0087] Multiple electrode connections 310 can be formed and arranged in a radially rotationally symmetrical manner. The electrode connections 310 can be formed with the same shape and can be arranged so that the center of the can lid 300 has an equal angle with respect to each other. For example, three electrode connections 310 with the same shape can be arranged in the can lid 300 at an equal angle of 120 degrees.

[0088] As described above, when multiple electrode connection portions 310 are symmetrically arranged, tilting between the can lid 300 and the electrode assembly 100 or uneven flatness between them can be significantly prevented.

[0089] Figure 8 It shows along Figure 4 A side section view of another part of the section cut by line AA'.

[0090] Reference Figure 3 , Figure 4 and Figure 8 The can lid 300 according to the embodiments of the present disclosure may also include a plurality of spacers 320.

[0091] The spacer portion 320 can be spaced apart from the electrode assembly 100. The lower surface of the spacer portion 320 and the upper end of the electrode assembly 100 can face each other while being spaced apart.

[0092] The spacer 320 can be disposed between two adjacent electrode connection portions 310. The spacer 320 can be disposed between every two electrode connection portions 310. Multiple spacers 320 can be formed and arranged in a rotationally symmetrical manner.

[0093] When viewed along the upward direction or the +Z axis direction, the electrode connection portion 310 can be formed as a recessed portion, and the spacer portion 320 can be formed as a protruding portion.

[0094] When the can cap 300 also includes the spacer 320 as described above, the two adjacent electrode connection portions 310 can be more reliably separated from each other. Furthermore, since an empty space can be ensured between the spacer 320 and the electrode assembly 100, the increase in internal pressure within the battery cell 10 due to thermal events or the like can be effectively mitigated.

[0095] When viewed along the direction of the central axis of the winding central hole C (e.g., the Z-axis direction), the total area of ​​the welded joint WL can be larger than the total area of ​​the spacer 320.

[0096] Here, the total area of ​​the welded joint WL can be understood as the sum of the areas of multiple welded joints WL, and the total area of ​​the spacer 320 can be understood as the sum of the areas of multiple spacers 320.

[0097] When the can lid 300 is configured as described above, an empty space can be formed that can reduce the increase in internal pressure inside the battery cell 10, while the welding area between the can lid 300 and the electrode assembly 100 can be further increased.

[0098] Furthermore, the spacer 320 can be configured as a pickup P. The pickup P can be an area that can be gripped by a pickup device. In this case, when the can cap 300 is picked up, foreign objects can be prevented from entering the electrode connection portion 310 from the pickup device, etc., and the can cap 300 can be stably gripped and transported during the assembly process of the battery cell 10.

[0099] Reference Figures 3 to 5 The can lid 300 may also include an injection hole 330 and a flat portion 350.

[0100] The injection port 330 may open toward the interior of the tank housing 200. Electrolyte can be injected into the tank housing 200 through the injection port 330. The shape and structure of the injection port 330 are not limited to those shown in the accompanying drawings, and can be arranged in various ways.

[0101] The plug 340 can be connected to the injection port 330. The plug 340 can cover the injection port 330. When the plug 340 is connected to the injection port 330, the injection port 330 can be closed. For example, the plug 340 can be fitted into the injection port 330. For example, the plug 340 can be connected to the injection port 330 by welding. Various connection methods can be applied between the injection port 330 and the plug 340. The shape and structure of the plug 340 are not limited to those shown in the figures and can be arranged in various ways.

[0102] The flat portion 350 may surround the injection hole 330. The flat portion 350 may surround the injection hole 330 generally in the circumferential direction. At least a portion of the flat portion 350 may be configured to be flat.

[0103] The flat portion 350 may be spaced apart from the electrode assembly 100. An empty space may be formed between the flat portion 350 and the electrode assembly 100, and this empty space may communicate with the empty space formed between the spacer portion 320 and the electrode assembly 100.

[0104] When the can cap 300 is configured as described above, the electrolyte can be easily injected into the battery cell 10 through the injection hole 330. Furthermore, the flat portion 350, spaced apart from the electrode assembly 100, prevents damage to the electrode assembly 100 when the plug 340 is connected to the injection hole 330 by welding or the like. Moreover, the empty space formed between the flat portion 350 and the electrode assembly 100 allows for more effective reduction of internal pressure.

[0105] Furthermore, the plug 340 may include a protrusion 341 and an extension 342. The protrusion 341 may project vertically toward the interior of the can housing 200, and the extension 342 may extend horizontally from the protrusion 341. The can lid 300 may also include a seat 331. The seat 331 may be a portion on which the extension 342 is seated. The upper surface of the seat 331 may be formed to be recessed toward the interior of the can housing 200, such that it is positioned at a lower height than the upper surface of the flat portion 350.

[0106] Figure 9 This is a plan view showing a can lid according to another embodiment of the present disclosure.

[0107] In the following text, reference will be made to Figure 9 A battery cell 10 according to another embodiment of the present disclosure is described in detail. The can cap 300 of the battery cell 10 according to another embodiment of the present disclosure may further include at least one of a first extension 311 and a second extension 312.

[0108] As described above, the can cap 300 may also include a flat portion 350, and the flat portion 350 may include a curved portion 351. The curved portion 351 may be recessed from the flat portion 350 toward the injection port 330.

[0109] The electrode connection portion 310 of the can cap 300 may further include a first extension portion 311. The first extension portion 311 may extend toward the bend portion 351. The first extension portion 311 may extend toward the injection hole 330 by an amount corresponding to the recess depth of the bend portion 351.

[0110] The welding connection portion WL can also be formed on the first extension portion 311. Therefore, when the electrode connection portion 310 also includes the first extension portion 311 as described above, the welding area between the can cover 300 and the electrode assembly 100 can be further increased.

[0111] Furthermore, in this case, the welding length (LFW, foil tab welding) between the electrode connection 310 and the electrode assembly 100 is increased (which can be formed parallel to the radial direction), making it possible to reduce the internal resistance of the battery cell 10 more effectively.

[0112] The electrode connection portion 310 of the can lid 300 may further include a second extension portion 312. The second extension portion 312 may extend in the circumferential direction.

[0113] The second extension 312 may be located near the central side of the lid 300 or the flat portion 350.

[0114] The welded connection portion WL can also be formed on the second extension portion 312. Therefore, when the electrode connection portion 310 also includes the second extension portion 312 as described above, the welding area between the can cover 300 and the electrode assembly 100 can be further increased.

[0115] Reference Figures 3 to 5 The can lid 300 according to the embodiments of the present disclosure may also include a plurality of bridging members 360.

[0116] The bridging member 360 can extend in the radial direction. The bridging member 360 can extend in the radial direction from the flat portion 350. The bridging member 360 can extend from the flat portion 350 toward the spacer portion 320.

[0117] Each of the plurality of bridging elements 360 may be disposed between two adjacent electrode connection portions 310. The plurality of bridging elements 360 may be formed and arranged in a radially rotationally symmetrical manner.

[0118] When the can lid 300 also includes the bridging member 360 as described above, the two adjacent electrode connection portions 310 can be more reliably separated and spaced apart, and the structural rigidity of the can lid 300 can be increased.

[0119] Furthermore, the bridging member 360 may be spaced apart from the electrode assembly 100 to form an empty space between them. In this case, the empty space between the bridging member 360 and the electrode assembly 100 may communicate with the empty space between the spacer 320 and the electrode assembly 100, and with the empty space between the flat portion 350 and the electrode assembly 100. The height of the upper surface of the bridging member 360 may be lower than the height of the upper surface of the spacer 320 and the upper surface of the flat portion 350, but higher than the upper surface of the electrode connection portion 310.

[0120] The can lid 300 according to an embodiment of the present disclosure may further include an edge portion 370. The edge portion 370 may be formed at the edge of the can lid 300 for attachment to the can housing 200. The edge portion 370 may be attached to the end of the can housing 200 at the opening 210 by an assembly method.

[0121] The edge portion 370 can be configured to be deformable in a direction parallel to the radial direction. In this case, the can lid 300 can be easily and securely assembled and attached to the end of the can shell 200 at the opening 210.

[0122] In addition, when the can lid 300 also includes the edge portion 370 as described above, when the can lid 300 is attached to the can housing 200, the tilt of the can lid 300 can be adjusted, thereby reliably and easily achieving a tight contact between the can lid 300 and the electrode assembly 100.

[0123] Figure 10 This is a plan view showing various can lids according to embodiments and variations thereof, and Figure 11 This is a side cross-sectional view showing various can lids according to embodiments and variations thereof.

[0124] In the following text, reference will be made to Figures 3 to 5 , Figure 10 and Figure 11 (in particular Figure 10 and Figure 11 The battery cell 10 according to embodiments of the present disclosure will be described in more detail below.

[0125] The can lid 300 of the battery cell 10 according to an embodiment of the present disclosure may also include a venting cutout 380.

[0126] Reference Figures 3 to 5 The vent cutout 380 can be formed by making a cut between the edge of the can lid 300 and the electrode connection portion 310. The vent cutout 380 can be configured to rupture due to the internal pressure of the high-temperature exhaust gas when a thermal event occurs in the battery cell 10, allowing the exhaust gas to be discharged from the battery cell 10 to the outside. Therefore, when the can lid 300 includes the vent cutout 380, the exhaust gas can be easily discharged from the battery cell 10. The vent cutout 380 can be formed by making a cut in the circumferential direction on the inner side of the edge (e.g., the inner side of the edge portion 370).

[0127] Figure 10 (a) shows a configuration in which the can lid 300 has a radius R-1, and in the welded connection portion WL provided in the electrode connection portion 310, the first -1 width W1-1 in the direction perpendicular to the radial direction is formed to be larger than the second -1 width W2-1 in the radial direction, and the vent cutout portion 380 has a radius r-1. Furthermore, Figure 11 (a) shows Figure 10 (a) A side cross-sectional view of the exposed electrode connection portion 310 of the can lid 300.

[0128] Figure 10(b) shows a configuration in which the can lid 300 has a radius R-2 equal to R-1, and in the welding connection WL provided in the electrode connection 310, the first-2 width W1-2 in the direction perpendicular to the radial direction is formed to be larger than the second-2 width W2-2 in the radial direction, and the exhaust cutout 380 has a radius r-2. Figure 11 (b) shows Figure 10 (b) A side cross-sectional view of the exposed electrode connection portion 310 of the can lid 300.

[0129] The radius r-2 can be smaller than the radius r-1, the width of the first -2 W1-2 can be greater than the width of the first -1 W1-1, and the width of the second -2 W2-2 can be smaller than the width of the second -1 W2-1.

[0130] In the can lid 300 according to an embodiment of the present disclosure, the vent cutout 380 may have, as follows: Figure 10 (a) and Figure 11 (a) shows a relatively large diameter, or as shown in Figure 10 (b) and Figure 11 (b) shows a relatively small diameter.

[0131] In addition, such as Figure 10 (b) and Figure 11 As shown in (b), even when the diameter of the exhaust cut-out portion 380 is relatively small, the welded joint portion WL is configured to have a first-2 width W1-2 and a second-2 width W2-2, so that the welded area between the can cover 300 and the electrode assembly 100 can still be adequately ensured.

[0132] Therefore, in the battery cell 10 according to the embodiments of the present disclosure, while sufficiently maintaining the welding area between the can cap 300 and the electrode assembly 100, the diameter of the vent cutout 380 can be configured differently, thereby facilitating design changes to the battery cell 10 or the battery pack 30 (explained later).

[0133] Figure 12 This is a diagram illustrating a battery pack according to an embodiment of the present disclosure.

[0134] Reference Figure 12 The battery pack 30 according to this disclosure may include at least one battery cell 10 according to this disclosure. The battery pack 30 may include a battery pack housing 20 that houses at least one battery cell 10.

[0135] In the accompanying drawings, for ease of illustration, components such as busbars for electrical connections to the battery cell 10, cooling units, and external terminals are omitted. The structure of the battery cell 10 used in manufacturing the battery pack 30 has been described above by way of example.

[0136] In addition, although not shown, the battery pack 30 according to this disclosure may also include various devices for controlling the charging and discharging of the battery cells 10, such as a BMS (battery management system), a current sensor, and a fuse.

[0137] Figure 13 This is a diagram illustrating a vehicle according to an embodiment of the present disclosure.

[0138] Reference Figure 13 The battery pack 30 according to embodiments of the present disclosure can be applied to a vehicle 40, such as an electric vehicle or a hybrid electric vehicle. That is, a vehicle 40 according to the present disclosure may include the battery pack 30 according to the present disclosure. The battery pack 30 may be installed in the main frame under the vehicle seat or in the trunk space. In addition to the battery pack 30, a vehicle 40 according to the present disclosure may also include various other components included in the vehicle 40. For example, in addition to the battery pack 30 according to the present disclosure, a vehicle 40 according to embodiments of the present disclosure may also include a body, a motor, a control device such as an ECU (electronic control unit), etc.

[0139] Furthermore, it should be understood that, in addition to the vehicle 40, the battery pack 30 according to this disclosure can also be installed in other devices, equipment and apparatus, such as energy storage systems utilizing secondary batteries.

[0140] Furthermore, although directional terms such as “up,” “down,” “right,” “left,” “front,” and “back” are used in this specification, it will be apparent to those skilled in the art that these terms are merely for the purpose of interpretation with reference to the accompanying drawings and may vary depending on the position of the target object or the observer’s position.

[0141] This disclosure has been described in detail. However, it should be understood that although preferred embodiments of this disclosure have been pointed out, the detailed description and specific examples are given by way of illustration only, as various variations and modifications within the scope of this disclosure will become apparent to those skilled in the art based on the detailed description.

[0142] [Figure Labels]

[0143] 10: Battery cells

[0144] 20: Battery pack casing

[0145] 30: Battery pack

[0146] 40: Vehicles

[0147] 100: Electrode assembly

[0148] 110: Electrode

[0149] 110a: First electrode

[0150] 110b: Second electrode

[0151] 120: Diaphragm

[0152] 200: Tank shell

[0153] 210: Opening

[0154] 220: Enclosed section

[0155] 300: Can lid

[0156] 310: Electrode connection part

[0157] 311: First Extension

[0158] 312: Second Extension

[0159] 320: Spacing section

[0160] 330: Injection Hole

[0161] 331: Seating area

[0162] 340: Plug

[0163] 341: Protrusion

[0164] 342: Extension Section

[0165] 350: Flat area

[0166] 351: Bend

[0167] 360: Bridging component

[0168] 370: Edge

[0169] 380: Exhaust cut-out section

[0170] 400: Electrode terminal

[0171] C: Center hole of winding

[0172] WL: Welded joint

[0173] W1: First width

[0174] W2: Second width

Claims

1. A battery cell, the battery cell comprising: An electrode assembly configured by winding the first electrode and the second electrode around a central axis of a winding central hole with a diaphragm inserted between the first electrode and the second electrode; A can housing that accommodates the electrode assembly and has an opening formed at one end of the can housing; as well as A can lid having a plurality of electrode coupling portions spaced apart from each other and coupled to the electrode assembly, the can lid being coupled to one end of the can housing. Each of the plurality of electrode connections includes a welded connection that is welded to the electrode assembly, the welded connection being configured such that the length of a first width in a direction perpendicular to the radial direction is greater than or equal to the length of a second width in the radial direction.

2. The battery cell according to claim 1, in, The welded joint is formed over the entire area of ​​the electrode joint.

3. The battery cell according to claim 1, in, The welded joint is configured to be flat.

4. The battery cell according to claim 1, in, It is equipped with three electrode connection parts.

5. The battery cell according to claim 1, in, The plurality of electrode connections are formed and arranged in a radially rotationally symmetrical manner.

6. The battery cell according to claim 1, in, The can lid also includes a plurality of spacers disposed between any two adjacent electrode connection portions and spaced apart from the electrode assembly.

7. The battery cell according to claim 6, in, When viewed along the central axis of the winding central hole, the total area of ​​the welded joint is larger than the total area of ​​the spacer.

8. The battery cell according to claim 1, in, The can lid also includes: Injection port, the injection port opening toward the interior of the tank shell; and A flat portion surrounding the injection hole and spaced apart from the electrode assembly.

9. The battery cell according to claim 8, in, The flat portion includes a curved portion recessed toward the injection port side, and The electrode connection portion also includes a first extension portion extending toward the curved portion.

10. The battery cell according to claim 1, in, The electrode connection portion further includes a second extension portion extending in the circumferential direction.

11. The battery cell according to claim 1, in, The can lid also includes a plurality of bridging elements that extend along the radial direction and are configured to separate any two adjacent electrode connection portions.

12. The battery cell according to claim 1, in, The can lid also includes an edge portion formed at the edge of the can lid to connect to the can body, and The edge portion is configured to be deformable in a direction parallel to the radial direction.

13. The battery cell according to claim 1, in, The can lid also includes an exhaust vent formed by making a cut between the edge of the can lid and the electrode connection portion.

14. A battery pack comprising at least one battery cell according to any one of claims 1 to 13.

15. A vehicle comprising at least one battery pack according to claim 14.

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