Battery, and battery pack and vehicle including the same

Abstract

A battery according to an embodiment of the present application includes: an electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound about a winding axis to define a core and an outer circumferential surface, wherein the first electrode includes a first uncoated portion that is not coated with an active material layer in a winding direction; a case that accommodates the electrode assembly through an opening at a lower end thereof; a first current collector that is coupled to the first uncoated portion and is located in the case; a cap that covers the opening; and a spacer that is interposed between the first current collector and the cap and has a height corresponding to a distance between the first current collector and the cap.

Description

Technical Field

[0001] This disclosure relates to batteries, battery packs including such batteries, and vehicles. More specifically, this disclosure relates to batteries having a structure that minimizes movement of their internal electrode assemblies, battery packs including such battery packs, and vehicles.

[0002] This application claims priority to Korean Patent Application No. 10-2021-0022881, No. 10-2021-0022893, No. 10-2021-0022893, No. 10-2021-0024424, No. 10-2021-0030291, No. 10-2021-0131207, and No. 10-2021-0131208, filed with the Korean Intellectual Property Office on February 19, 2021, the disclosures of which are incorporated herein by reference in their entirety. Background Technology

[0003] In batteries, electrode assemblies with positive and negative terminals extending upward and downward along the length of the casing, respectively, can be used to maximize current collection efficiency. In batteries using electrode assemblies with this structure, current collectors can serve as intermediates connecting the positive and negative terminals to the terminals and the casing, respectively.

[0004] In this configuration, for example, the positive current collector can be connected to the positive terminal while covering one surface of the electrode assembly, and the negative current collector can be connected to the negative terminal while covering the other surface of the electrode assembly. Additionally, the positive current collector can be electrically connected to a terminal, and the negative current collector can be electrically connected to the housing.

[0005] A battery with the above structure can have a relatively large empty space, especially between the negative electrode current collector and the cover. Additionally, another empty space can exist between the bottom of the casing opposite the cover and the positive electrode current collector.

[0006] These empty spaces can cause the electrode assembly to move within the housing, especially along the vertical direction (i.e., the height of the battery). When the electrode assembly moves vertically, it can damage the connection between the current collector and the electrode connector, as well as the connection between the current collector and the housing, and the connection between the current collector and the terminals. For example, when the electrode assembly vibrates up and down, the connector repeatedly bends and stretches, and may eventually break, causing a short circuit in the battery.

[0007] Therefore, it is necessary to minimize the movement space of the electrode assembly. Additionally, when using additional components to reduce the movement space of the electrode assembly, manufacturing complexity and costs may increase, thus requiring the use of existing components to address the problem. Summary of the Invention

[0008] Technical issues

[0009] This disclosure aims to solve the above-mentioned problems, and is therefore specified to prevent damage to electrical connections caused by movement of electrode assemblies in the battery housing.

[0010] However, the technical problems addressed in this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description other problems not mentioned herein.

[0011] Technical solution

[0012] To address the aforementioned problems, a battery according to an embodiment of the present disclosure includes: an electrode assembly comprising a first electrode, a second electrode, and a separator wound around a winding shaft to define a core and an outer peripheral surface, wherein the first electrode includes a first uncoated region along the winding direction uncoated with an active material layer; a housing that accommodates the electrode assembly through an opening at its lower end; a first current collector coupled to the first uncoated region and disposed within the housing; a cap that covers the opening; and a spacer located between the first current collector and the cap and having a height corresponding to the distance between the first current collector and the cap.

[0013] Preferably, the spacer can be disposed on the central portion of one surface of the first current collector.

[0014] In one aspect of this disclosure, the first current collector may include: a support portion located at a central portion on a surface of the electrode assembly; an uncoated area connection portion extending from the support portion and connected to a first uncoated area; and a housing contact portion extending from an end of the support portion or the uncoated area connection portion and electrically connected to a housing.

[0015] Preferably, the spacer may cover the support portion of the first current collector to prevent the support portion from being exposed outside the spacer.

[0016] Specifically, the outer diameter of the upper end of the spacer facing the first current collector can be equal to or greater than the outer diameter of the support portion.

[0017] In another aspect of this disclosure, the spacer may cover at least a portion of the welded portion formed by welding the uncoated area of ​​the first current collector to the first uncoated area.

[0018] Preferably, the radius of the upper end of the spacer facing the first current collector is greater than the distance from the welded portion of the core closest to the electrode assembly to the core of the electrode assembly.

[0019] In another aspect of this disclosure, the cap may include an exhaust portion having a smaller thickness compared to its surrounding area.

[0020] Preferably, the venting section can be configured to rupture when the internal pressure of the housing increases above a predetermined level.

[0021] Specifically, the venting portion can be a notch formed on at least one of the two surfaces of the cap.

[0022] In another aspect of this disclosure, the exhaust section can form a closed loop.

[0023] Preferably, the exhaust portion can be circular.

[0024] In another aspect of this disclosure, the venting portion may be closer to the end of the cap than the midpoint of the straight line connecting the center of the cap to the end of the cap.

[0025] In another aspect of this disclosure, the exhaust portion may be formed along the edge of a flat area that protrudes downward from the edge region of the cap.

[0026] In another aspect of this disclosure, the spacer may be located further inside the core than the vent portion, so as not to cover the vent portion of the cap.

[0027] Preferably, the radius of the spacer facing the lower end of the cap is smaller than the distance from the center of the cap to the exhaust portion.

[0028] In another aspect of this disclosure, the spacer may include a spacer hole at a position corresponding to the winding center hole of the electrode assembly.

[0029] In another aspect of this disclosure, the support portion may include a first current collector hole at a position corresponding to the winding center hole of the electrode assembly.

[0030] In another aspect of this disclosure, the battery may further include: a side cover that covers at least a portion of the outer peripheral surface of the electrode assembly and contacts the inner peripheral surface of the housing.

[0031] Preferably, the side cover may cover at least a portion of the outer peripheral surface of the electrode assembly.

[0032] Specifically, the side cover may have a thickness corresponding to the distance between the outer peripheral surface of the electrode assembly and the inner peripheral surface of the housing.

[0033] In another aspect of this disclosure, the housing may include: a pressing edge portion formed by pressing around the outer peripheral surface of the housing; and a rolled edge portion that extends and bends such that the end defining the opening portion surrounds the edge of the cap below the rolled edge portion.

[0034] Preferably, the housing contact portion can contact a surface of the pressing edge portion facing the cap.

[0035] In another aspect of this disclosure, the second electrode may include a second uncoated region along the winding direction from which no active material layer is coated.

[0036] In another aspect of this disclosure, the battery may further include: a second current collector connected to a second uncoated area; and an insulator disposed between a closed portion located at the upper end of the housing and the second current collector.

[0037] Preferably, the insulator may have a height corresponding to the distance between the second current collector and the enclosure.

[0038] In another aspect of this disclosure, the spacer may be made of a material having elastic properties.

[0039] In another aspect of this disclosure, the resistance measured between the positive and negative terminals is 4 milliohms or less.

[0040] In another aspect of this disclosure, the form factor can be greater than 0.4, and the form factor ratio is calculated by dividing the diameter of the battery by the height of the battery.

[0041] To address the aforementioned problems, the battery pack according to embodiments of the present disclosure includes a plurality of batteries as described above according to embodiments of the present disclosure.

[0042] In one aspect of this disclosure, the battery may further include a terminal opposite the opening portion and electrically connected to the second electrode.

[0043] In another aspect of this disclosure, multiple batteries can be arranged in a predetermined number of columns, and the outer surface of the terminals and the enclosed portion of the housing of each battery is positioned upward.

[0044] In another aspect of this disclosure, the battery pack may include a plurality of busbars to connect a plurality of batteries in series and in parallel, the plurality of busbars may be arranged above the plurality of batteries, and each busbar may include: a body portion extending between terminals of adjacent batteries; a plurality of first busbar terminals extending toward one side of the body portion and electrically connected to terminals of batteries disposed on that side; and a plurality of second busbar terminals extending toward the opposite side of the body portion and electrically connected to the outer surface of an enclosed portion of a housing of a battery disposed on the opposite side.

[0045] To address the aforementioned problems, a vehicle according to an embodiment of the present disclosure includes a battery pack according to an embodiment of the present disclosure.

[0046] Technical effect

[0047] According to one aspect of this disclosure, movement of the electrode assembly within the battery housing can be minimized, thereby preventing damage to the electrical connections.

[0048] However, the effects that can be obtained through this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description other technical effects mentioned herein. Attached Figure Description

[0049] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the following detailed description, are intended to provide a further understanding of the technical aspects of the present disclosure; therefore, the present disclosure should not be construed as limited to the drawings.

[0050] Figure 1 This is a perspective view showing the appearance of a battery according to an embodiment of the present disclosure.

[0051] Figure 2 This is a cross-sectional view showing the internal structure of a battery according to an embodiment of the present disclosure.

[0052] Figure 3 This is a perspective view showing an exemplary shape of the first current collector applied to this disclosure.

[0053] Figure 4a This is a partial cross-sectional view showing the area where the spacer according to an embodiment of the present disclosure is applied.

[0054] Figure 4b This is a diagram illustrating the positional relationship between the spacer and the first current collector of this disclosure.

[0055] Figure 4c This is a diagram illustrating the positional relationship between the spacer and the exhaust section of this disclosure.

[0056] Figure 5 This is a partial cross-sectional view showing the area where a spacer is applied according to another embodiment of the present disclosure.

[0057] Figure 6 This is a bottom view of the battery disclosed in this publication.

[0058] Figure 7a This is a partial cross-sectional view showing the region where the insulator of this disclosure is applied.

[0059] Figure 7b This is a cross-sectional view showing the area where the side cover of this disclosure is applied.

[0060] Figure 8 This is a diagram showing an electrode assembly having a fragment of this disclosure.

[0061] Figure 9 This is a top view showing multiple batteries connected in series and parallel according to an embodiment of the present disclosure using busbars.

[0062] Figure 10 This is a schematic diagram showing a battery pack according to an embodiment of the present disclosure.

[0063] Figure 11 This is a concept diagram of a vehicle according to an embodiment of the present disclosure.

[0064] [List of reference numerals]

[0065] 5: Vehicles

[0066] 3: Battery pack

[0067] 2: Battery pack casing

[0068] 1: Battery

[0069] 10: Electrode assembly

[0070] 11: First uncoated area

[0071] 12: Second uncoated area

[0072] C: Center hole of winding

[0073] 20: Shell

[0074] 20a: First electrode terminal

[0075] 21: Edge pressing section

[0076] 22: Curled edge section

[0077] 30: First current collector

[0078] 31: Supporting Part

[0079] 32: Uncoated area connection part

[0080] 33: Housing contact portion

[0081] H1: First manifold hole

[0082] BD: Welding section

[0083] 40: Hat

[0084] 41: Exhaust section

[0085] 50: Spacer

[0086] H2: Spacer hole

[0087] 60: Terminal (Second Electrode Terminal)

[0088] G: Insulating gasket

[0089] 70: Second current collector

[0090] 80: Insulator

[0091] 90: Side Cover

[0092] 100: Sealing gasket Detailed Implementation

[0093] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before description, it should be understood that the terms or words used in the specification and appended claims should not be construed as limited to their general and dictionary meanings, but rather should be interpreted based on their meanings and concepts corresponding to the technical aspects of the present disclosure, on the basis of the principle that the inventors are allowed to appropriately define the terms for best interpretation. Therefore, the embodiments described herein and the examples shown in the accompanying drawings are merely some exemplary embodiments of the present disclosure and are not intended to fully describe the technical aspects of the present disclosure; thus, it should be understood that various other equivalents and modifications may be made thereto at the time of filing the application.

[0094] Additionally, to aid in understanding this disclosure, the accompanying drawings may illustrate some elements at exaggerated sizes rather than to actual scale. Furthermore, the same elements in different embodiments may be given the same reference numerals.

[0095] When two elements are said to be equal, it means that they are "substantially equal." Therefore, substantial equality can cover all cases with deviations considered low in the corresponding technical field (e.g., deviations below 5%). Furthermore, the uniformity of a specific parameter within a certain region can represent uniformity in terms of average value.

[0096] Although the terms first, second, etc., are used to describe different elements, these elements are not limited by the terms. These terms are used to distinguish one element from another, and unless otherwise stated, the first element can be the second element.

[0097] Throughout the specification, unless otherwise stated, each element may be singular or plural.

[0098] When an element is "above (or below)" or "on (or below)" another element, the element may be on the upper (or lower) surface of the other element, and an intermediary element may exist between the element and other elements located above (or below) the element.

[0099] Additionally, when an element is referred to as “connected,” “linked,” or “coupled” to another element, the element may be directly connected or linked to the other element. However, it should be understood that intermediary elements may exist between each element, or each element may be “connected,” “linked,” or “coupled” to each other through another element.

[0100] Throughout this specification, unless otherwise expressly stated, “A and / or B” means A or B or both, and unless otherwise expressly stated, “C to D” means above C and below D.

[0101] Reference Figure 1 and Figure 2 According to embodiments of the present disclosure, the battery 1 may be, for example, a cylindrical battery. The battery 1 includes an electrode assembly 10, a housing 20, a first current collector 30, a cap 40, and a spacer 50.

[0102] In addition to the aforementioned components, battery 1 may also include at least one of the following: insulating gasket G, terminal 60, second current collector 70, insulator 80, side cover 90, and sealing gasket 100.

[0103] This disclosure is not limited to the shape of the battery and can be applied to batteries of other shapes, such as prism batteries.

[0104] Reference Figure 2 , Figure 4a , Figure 7a and Figure 8 The electrode assembly 10 includes a first uncoated region 11 and a second uncoated region 12. The electrode assembly 10 includes a first electrode having a first polarity, a second electrode having a second polarity, and a diaphragm inserted between the first and second electrodes. The first electrode corresponds to a negative or positive electrode, while the second electrode corresponds to an electrode with the opposite polarity to the first electrode.

[0105] The electrode assembly 10 can have, for example, a wound core shape. That is, the electrode assembly 10 can be manufactured by winding a laminate formed by at least once by stacking a first separator, a first electrode, a second separator, and a second electrode in the following order. The wound core type electrode assembly 10 can have a central winding hole C at its center, which extends along the height direction (parallel to the Z-axis). The structure of the wound core type electrode assembly 10 is well known in the field of cylindrical battery technology, and its detailed description is omitted. Furthermore, an additional separator can be provided on the outer peripheral surface of the electrode assembly 10 to insulate it from the housing 20.

[0106] The first electrode includes a first conductive substrate having a sheet shape and a first electrode active material layer formed by coating one or both surfaces of the first conductive substrate. A first uncoated region 11, uncoated with the first electrode active material, exists at one end of the first conductive substrate in the width direction (parallel to the Z-axis). When the first electrode is viewed in its unfolded state, the uncoated region extends from one end to the other along the length direction of the first electrode. The uncoated region 11 itself can serve as a first electrode connector. The uncoated region 11 is located on one surface of the electrode assembly 10. More specifically, the uncoated region 11 is located below the electrode assembly 10 housed in the housing 20 in the height direction (parallel to the Z-axis).

[0107] The second electrode includes a second conductive substrate having a sheet shape and a second electrode active material layer formed by coating one or both surfaces of the second conductive substrate. An uncoated region, not coated with the second electrode active material, exists at the other end of the second conductive substrate in the width direction (parallel to the Z-axis). When the second electrode is viewed in its unfolded state, the uncoated region 12 extends from one end to the other along the length direction of the second electrode. The uncoated region 12 itself can serve as a second electrode connector. The uncoated region 12 is on another surface of the electrode assembly 10. More specifically, the uncoated region 12 is located on the electrode assembly 10 housed in the housing 20 in the height direction (parallel to the Z-axis).

[0108] In other words, the first uncoated region 11 and the second uncoated region 12 extend and protrude in opposite directions along the height direction of the electrode assembly 10 (parallel to the Z-axis) (i.e., the height direction of the battery 1) and are exposed outside the separator.

[0109] In addition, refer to Figure 8At least a portion of the first uncoated region 11 and / or the second uncoated region 12 may include a plurality of segments F divided along the winding direction of the electrode assembly 10. In this case, the plurality of segments may be bent along the winding direction of the electrode assembly 10. The plurality of bent segments may overlap in multiple layers along the radial direction of the electrode assembly 10. In this case, the first current collector 30 and / or the second current collector 70, as described below, may be coupled to the region where the plurality of segments F overlap in multiple layers. Furthermore, the electrode assembly 10 may have a welding target region comprising a uniform number of overlaps of segments F of the first uncoated region 11 along the radial direction of the electrode assembly 10. Since the number of overlapping layers is approximately maximum in this region, welding between the first current collector 30 and the first uncoated region 11 and / or welding between the second current collector 70 and the second uncoated region 12, as described below, can be performed in this region to improve the welding quality. For example, in the case of laser welding, damage to the electrode assembly 10 due to the laser beam passing through the first uncoated region 11 and / or the second uncoated region 12 can be prevented when the laser output is increased, thereby improving the welding quality. In addition, it effectively prevents impurities such as welding slag from penetrating into the electrode assembly 10.

[0110] In this disclosure, the positive electrode active material coated on the positive electrode current collector and the negative electrode active material coated on the negative electrode current collector may include any active material known in the corresponding art related to this disclosure, without limitation.

[0111] In the example, the positive electrode active material may include materials of formula A[A] x M y ]O 2+z The alkali metal compound represented (A includes at least one of Li, Na or K; M includes at least one selected from Ni, Co, Mn, Ca, Mg, Al, Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; x ≥ 0, 1 ≤ x + y ≤ 2, 0.1 ≤ z ≤ 2; stoichiometric coefficients x, y and z are chosen to maintain the electroneutrality of the compound).

[0112] In another example, the positive electrode active material can be the alkali metal compound xLiM disclosed in US 6,677,082 and US 6,680,143. 1 O2-(1-x)Li2M 2 O3(M 1 Includes at least one element with an average trivalent oxidation state; M 2 Includes at least one element with an average tetravalent oxidation state; 0 ≤ x ≤ 1).

[0113] In yet another example, the positive electrode active material could be made from Li a M 1x Fe 1-x M 2 y P 1-y M 3 z O 4-z denotes a lithium metal phosphate (M 1 includes at least one selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, and Al; M 2 includes at least one selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, As, Sb, Si, Ge, V, and S; M 3 includes a halogen element optionally containing F; 0 < a ≤ 2, 0 ≤ x ≤ 1, 0 ≤ y < 1, 0 ≤ z < 1; the stoichiometric coefficients a, x, y, and z are selected to maintain the electrical neutrality of the compound) or Li3M2(PO4)3 [M includes at least one selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg, and Al].

[0114] Preferably, the positive electrode active material may include primary particles and / or secondary particles formed by agglomeration of the primary particles.

[0115] In an example, the negative electrode active material may include a carbon material, a lithium metal or a lithium metal compound, a silicon or a silicon compound, a tin or a tin compound. For the negative electrode active material, metal oxides having a potential lower than 2V such as TiO2, SnO2, etc. may be used. The carbon material may include low-crystalline carbon and / or high-crystalline carbon.

[0116] For example, the separator may include a porous polymer membrane, and the porous polymer membrane is made of a polyolefin-based polymer (such as a homopolymer of ethylene used alone, a homopolymer of propylene, an ethylene / butene copolymer, an ethylene / hexene copolymer, and an ethylene / methacrylate copolymer, or a laminate thereof). In another example, the separator may include a common porous non-woven fabric, for example, a non-woven fabric made of high-melting-point glass fibers and polyethylene terephthalate fibers.

[0117] The separator may include an inorganic particle coating layer on at least one surface. Additionally, the separator itself may be formed by an inorganic particle coating layer. The particles forming the coating layer may be held together with a binder such that there is an interstitial volume between adjacent particles.

[0118] The inorganic particles may include inorganic particles having a dielectric constant of 5 or more. Non-limiting examples of the inorganic particles may include at least one material selected from the group consisting of: Pb(Zr,Ti)O3 (PZT), Pb 1-x La x Zr1-y Ti y O3(PLZT), PB(Mg3Nb) 2 / 3 Hafnium dioxide (HfO2), PbTiO3 (PMN-PT), BaTiO3, SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO and Y2O3.

[0119] Electrolytes can be those with A + Salts with a B-structure. Here, A... + Including alkali metal cations (such as Li) + Na + K + (or a combination thereof). B - Includes at least one anion selected from the group consisting of: F - Cl - ,Br - I-, NO3 - N(CN)2 - BF4 - ClO4 - AlO4 - AlCl4 - PF6 - SbF6 - AsF6 - BF2C2O4 - BC4O8 - (CF3)2PF4 - (CF3)3PF3 - (CF3)4PF2 - (CF3)5PF - (CF3)6P - CF3SO3 - C4F9SO3 - CF3CF2SO3 - (CF3SO2)2N - (FSO2)2N - CF3CF2(CF3)2CO - (CF3SO2)2CH - (SF5)3C - (CF3SO2)3C - CF3(CF2)7SO3 - CF3CO2 - CH3CO2 - SCN - and (CF3CF2SO2)2N - .

[0120] Electrolytes can be used by dissolving them in organic solvents. Organic solvents may include propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), or γ-butyrolactone.

[0121] Reference Figure 1 , Figure 2 , Figure 4a and Figure 7a The housing 20 accommodates the electrode assembly 10 through an opening at its lower end. The housing 20 may be a generally cylindrical container with an opening at the bottom and a closed portion at the top. The housing 20 may be made of a material with conductive properties (e.g., a metal). The material of the housing 20 may be a metal, such as steel, stainless steel, or aluminum. The sides (outer peripheral surfaces) and the upper surface of the housing 20 may be integrally formed. The upper surface of the housing 20 (the surface parallel to the XY plane) may have a generally flat shape. The housing 20 accommodates the electrolyte together with the electrode assembly 10 through the opening at its lower end.

[0122] The housing 20 is electrically connected to the electrode assembly 10. The housing 20 is connected to the first uncoated region 11 of the electrode assembly 10. Therefore, the housing 20 and the first uncoated region 11 have the same polarity.

[0123] Reference Figure 2 and Figure 4a The housing 20 may include a pressing edge portion 21 and a rolled edge portion 22 at its lower end. The pressing edge portion 21 is disposed below the electrode assembly 10 housed within the housing 20. The pressing edge portion 21 is formed by press-fitting around the outer peripheral surface of the housing 20. The pressing edge portion 21 may locally reduce the inner diameter of the housing 20 to prevent the electrode assembly 10, whose dimensions are approximately equivalent to the width of the housing 20, from dislodging from the opening at the bottom of the housing 20. The pressing edge portion 21 may also serve as a support for mounting the cap 40.

[0124] The rolled edge portion 22 is located below the pressed edge portion 21. The rolled edge portion 22 may face the opening portion compared to the pressed edge portion 21, and may extend toward the opening portion and bend inward from the housing 20. The rolled edge portion 22 extends and bends to surround at least a portion of the outer peripheral surface of the cap 40 below the pressed edge portion 21 and the lower surface of the cap 40.

[0125] Reference Figures 2 to 4aThe first current collector 30 can be coupled to the first uncoated area 11 of the electrode assembly 10 and disposed within the housing 20. The first current collector 30 covers at least a portion of a bottom surface of the electrode assembly 10. The assembly including the electrode assembly 10 and the first current collector 30 can be inserted into the housing 20 through an opening at the bottom of the housing 20. The first current collector 30 is electrically connected to the housing 20. That is, the first current collector 30 can act as an intermediary for the electrical connection between the electrode assembly 10 and the housing 20.

[0126] Reference Figure 3 The first current collector 30 may include, for example, a support portion 31, an uncoated area connection portion 32, and a housing contact portion 33.

[0127] The support portion 31 is located approximately at the center of one surface of the bottom of the electrode assembly 10. The support portion 31 may have a first current collector hole H1. In this case, the first current collector hole H1 may be located at a position corresponding to the winding center hole C of the electrode assembly 10. The first current collector hole H1 can serve as an insertion channel for welding rods or laser irradiation for connection between the terminal 60 and the second current collector 70 as described below. Furthermore, the first current collector hole H1 can serve as a channel for the electrolyte to smoothly permeate into the electrode assembly 10 during electrolyte injection.

[0128] In one aspect of this disclosure, an uncoated area connection portion 32 extends from the support portion 31 and connects to the first uncoated area 11. Specifically, the uncoated area connection portion 32 can be connected to the first uncoated area 11 by welding. Welding methods may include, for example, laser welding, resistance welding, and ultrasonic welding, but are not limited thereto. The uncoated area connection portion 32 can be connected to the first uncoated area 11 by welding parallel to the upper surface of the battery housing 20. The first uncoated area 11 and the uncoated area connection portion 32 can be connected by welding along the radial direction of the electrode assembly 10.

[0129] In one embodiment, when the uncoated area connection portion 32 is placed at the end of the first uncoated area 11, welding can be performed in a predetermined area. In another embodiment, such as Figure 8As shown, at least a portion of the first uncoated region 11 may include a plurality of segments F along the winding direction of the electrode assembly 10. The plurality of segments F may be bent along the radial direction of the electrode assembly 10 to form a curved surface. The radial direction of the electrode assembly refers to the direction toward the core or the outer periphery. For example, the plurality of segments F may be bent toward the core of the electrode assembly 10. The plurality of segments F may overlap in multiple layers along the radial direction of the electrode assembly 10. The curved surface may include a region where the number of overlapping layers of segments F gradually increases from the outer periphery of the electrode assembly 10 toward the core to a maximum number of layers, and a region where the number of overlapping layers is consistent from the radial position where the number of overlapping layers is at its maximum to the radial position where the innermost segment is located.

[0130] In this configuration, when the uncoated area connection portion 32 is placed on the curved surface of the first uncoated area 11, welding can be performed in a predetermined area. That is, the uncoated area connection portion 32 can be connected to a region where multiple segments F overlap in multiple layers. For example, the uncoated area connection portion 32 can be connected to the curved surface such that it overlaps with a region having the same number of layers. For example, welding between the uncoated area connection portion 32 and the first uncoated area 11 can be performed in a region of the first uncoated area 11 on the curved surface of the first uncoated area 11 that includes 10 or more overlapping layers. By adjusting the length of the first uncoated area 11, the ratio of the radius of the region including 10 or more overlapping layers to the radius of the electrode assembly excluding the core can be equal to or greater than 25%.

[0131] In another aspect of this disclosure, weld beads can be formed in the welding area between the first uncoated area 11 and the uncoated area connection portion 32. A weld bead is an approximately circular weld portion formed when spot welding is performed at a specific point. A specific welding pattern can be formed by connecting multiple weld beads. For example, see reference... Figure 4a and Figure 4b The weld portion BD can be formed into an approximately straight-line shape by multiple solder beads. In an embodiment, the weld portion BD between the first uncoated area 11 and the uncoated area connection portion 32 can form a weld pattern extending in the radial direction of the electrode assembly 10. More preferably, the weld portion BD between the first uncoated area 11 and the uncoated area connection portion 32 can form a straight-line weld pattern extending in the radial direction of the electrode assembly 10.

[0132] In another aspect of this disclosure, for example, a plurality of uncoated area connection portions 32 may be provided. In this case, each of the plurality of uncoated area connection portions 32 may extend radially from the support portion 31. The uncoated area connection portions 32 may have a strip shape. In a variation, the sides of the uncoated area connection portions 32 may be modified to a circular shape.

[0133] The housing contact portion 33 can be as follows Figure 3 As shown, it extends from the support portion 31, or is connected to... Figure 3 Conversely, the housing contact portion 33 may extend from the end of the uncoated area connection portion 32. Therefore, the housing contact portion 33 can be electrically connected to the housing 20. Specifically, the end of the housing contact portion 33 may be inserted between the sealing gasket 100 and the housing 20 as described below and contact the housing 20 to establish an electrical connection between the housing 20 and the first current collector 30. For example, the end of the housing contact portion 33 may contact a surface of the pressing portion 21 facing the cap 40.

[0134] Furthermore, the housing contact portion 33 can be pressed and secured by the rolled edge portion 22. For example, see reference... Figure 4a The housing contact portion 33 of the first current collector 30 can be placed on the lower surface of the pressing portion 21. The cap 40, with its end surrounded by a sealing gasket 100, can be placed on the lower surface of the housing contact portion 33. Subsequently, the housing 20 is bent around the edge of the cap 40 to secure the cap 40 and the first current collector 30. The cap 40 and the first current collector 30 are secured to the pressing portion 21 by a bent crimp portion 22.

[0135] Furthermore, a welded portion can be formed between the pressing portion 21 of the housing 20 and the housing contact portion 33 of the first current collector 30. For example, the housing contact portion 33 may not be firmly fixed solely by pressing force. Moreover, the connection strength between the first current collector 30 and the housing 20 may decrease when the sealing gasket 100 shrinks due to heat or the rolled edge portion 22 deforms due to external impact. Therefore, when the housing contact portion 33 is placed on the pressing portion 21 of the housing 20, the first current collector 30 can be fixed to the housing 20 by welding. In this case, the housing contact portion 33 can be connected to the pressing portion 21 on the inner surface of the housing 20. Figure 4a As shown, the lower surface of the pressing portion 21 can extend in a direction substantially parallel to the upper surface of the housing 20 (i.e., substantially perpendicular to the sidewall of the housing 20), and the housing contact portion 33 can also extend in the same direction, so that the housing contact portion 33 is stably in contact with the pressing portion 21. Additionally, since the housing contact portion 33 stably contacts the pressing portion 21, the two components can be smoothly welded, thereby improving the connection strength between the two components and minimizing the increase in resistance at the connection point.

[0136] Additionally, by using a structure in which the first current collector 30 is connected to the pressure edge portion 21 of the housing 20 instead of the inner surface of the cylinder of the housing 20, the distance between the first current collector 30 and the pressure edge portion 21 can be reduced. Therefore, the dead zone in the housing 20 can be minimized, thereby increasing the energy density of the battery 1.

[0137] In another aspect of this disclosure, the weld between the pressing portion 21 and the housing contact portion 33 can form a weld pattern in a straight line extending circumferentially. Alternatively, the weld between the pressing portion 21 and the housing contact portion 33 can also form a weld pattern in an arc shape extending circumferentially.

[0138] In another aspect of this disclosure, for example, a housing contact portion 33 may be present. In this case, a plurality of housing contact portions 33 may be as follows: Figure 3 As shown, it extends radially from the support portion 31, and at least one housing contact portion 33 may be between adjacent uncoated area connecting portions 32. Alternatively, with Figure 3 Conversely, each of the plurality of housing contact portions 33 may extend from the end of each of the plurality of uncoated area connection portions 32.

[0139] Reference Figure 2 , Figure 4a and Figure 6 The cap 40 covers the opening of the housing 20. For example, the cap 40 may be made of metal to ensure rigidity. The cap 40 forms the lower surface of the battery 1. In the battery 1 of this disclosure, even if the cap 40 is made of a metal with conductive properties, the cap 40 may not be polarized. The absence of polarity indicates that the cap 40 is electrically insulated from the housing 20 and the terminal 60. Therefore, the cap 40 does not act as a positive or negative terminal. Therefore, the cap 40 does not need to be electrically connected to the electrode assembly 10 and the housing 20, and the cap 40 does not need to be made of a conductive metal.

[0140] When the housing 20 of this disclosure includes a pressing edge portion 21, the cap 40 can be placed on the pressing edge portion 21 of the housing 20. Additionally, when the housing 20 of this disclosure includes a rolled edge portion 22, the cap 40 is secured by the rolled edge portion 22. A sealing gasket 100 is located between the cap 40 and the rolled edge portion 22 of the housing 20 to ensure the sealing performance of the housing 20.

[0141] Reference Figure 4a and Figure 6 The cap 40 may also include a venting portion 41 to prevent the internal pressure from rising above a preset value due to gas generated in the housing 20. The venting portion 41 corresponds to a region with a smaller thickness than other regions in the cap 40. The venting portion 41 is structurally weaker than any other region. Therefore, when the internal pressure of the housing 20 rises above a predetermined level due to an accident or malfunction of the battery 1, the venting portion 41 ruptures to force the gas generated in the housing 20 out. For example, the venting portion 41 can be formed by slotting on any one or both surfaces of the cap 40 to locally reduce the thickness of the housing 20. That is, the venting portion 41 can be a notch in at least one of the two surfaces of the cap 40.

[0142] like Figure 4a As shown, the lower end of the cap 40 is preferably positioned higher than the lower end of the housing 20. With this structure, even when the lower end of the housing 20 contacts the ground or bottom of the housing to form a module or battery pack, the cap 40 does not contact the ground or bottom of the housing. Therefore, it prevents the pressure required for the venting portion 41 to rupture due to the weight of the battery 1 from differing from the design pressure, thus allowing the venting portion 41 to rupture smoothly.

[0143] In addition, the exhaust section 41 may have the following characteristics: Figure 6 The closed-loop shape is shown. Preferably, the exhaust portion 41 can be circular. In this case, specifically, the greater the distance from the center of the cap 40 to the exhaust portion 41, the easier the exhaust portion 41 can break. When the same exhaust pressure is applied, the greater the distance from the center of the cap 40 to the exhaust portion 41, the greater the force acting on the exhaust portion 41, making it easier to break. Additionally, the longer the distance from the center of the cap 40 to the exhaust portion 41, the smoother the gas can be forced out. For example, the exhaust portion 41 can be closer to the end than the midpoint of the straight line connecting the center of the cap 40 to the end of the cap 40. From this perspective, the exhaust portion 41 can extend downwards from the edge region of the cap 40 (based on...). Figure 4a The edges of a roughly flat area protrude downwards.

[0144] Although this disclosure Figure 6 The exhaust section 41 is shown as a continuous terrain forming an approximately circular shape, but this disclosure is not limited thereto. The exhaust section 41 may be discontinuously formed into an approximately circular shape on the cap 40, and may also be formed into an approximately straight shape or other shapes.

[0145] Reference Figure 2 , Figure 4a and Figure 5 The spacer 50 is configured to prevent the electrode assembly 10 from moving. That is, the spacer 50 is located between the cap 40 and the electrode assembly 10 to fix the electrode assembly 10. More specifically, the spacer 50 can fix the vertical position of the electrode assembly 10.

[0146] In one aspect of this disclosure, the upper surface of the spacer 50 may contact the lower surface of the first current collector 30, and the lower surface of the spacer 50 may contact the inner surface of the cap 40. That is, the spacer 50 is located between the first current collector 30 and the cap 40. The spacer 50 may have a height corresponding to the distance between the first current collector 30 and the cap 40. In this case, the spacer 50 can effectively prevent the electrode assembly 10 from moving within the housing 20 due to the gap formed between the first current collector 30 and the cap 40. For example, the spacer 50 may fill at least a portion of the space between the first current collector 30 and the cap 40, thereby preventing the electrode assembly 10 from vibrating up and down when the battery 1 vibrates up and down. Therefore, unnecessary bending or stretching of the first uncoated area 11 and / or the second uncoated area 12 can be prevented. Therefore, the spacer 50 can prevent damage to the connection portion between the electrode assembly 10 and the first current collector 30 and / or the connection portion between the first current collector 30 and the housing 20. Finally, the spacer 50 can prevent internal short circuits in the battery 1.

[0147] In another aspect of this disclosure, the spacer 50 may be disposed approximately at the center of a surface on the bottom of the electrode assembly 10.

[0148] Figure 5 This is a partial cross-sectional view showing a region where a spacer according to another embodiment of this disclosure is applied. (Refer to...) Figure 5 The spacer 50 may have a spacer hole H2 at a position corresponding to the winding center hole C of the electrode assembly 10. Similar to the first current collector hole H1 described above, the spacer hole H2 can serve as an insertion channel for the welding electrode or a channel for laser irradiation. In this case, the winding center hole C of the electrode assembly 10, the first current collector hole H1, and the spacer hole H2 can be formed in a straight line. With this structure, similar to the first current collector hole H1 described above, the spacer hole H2 can serve as a channel for the electrolyte to effectively wet the electrode assembly 10 during electrolyte injection.

[0149] In one aspect of this disclosure, the spacer 50 may cover the support portion 31 of the first current collector 30 to prevent the support portion 31 from being exposed outside the spacer 50. For example, see reference to Figure 4a and Figure 4b The outer diameter of the upper end of the spacer 50 facing the first current collector 30 can be approximately equal to or greater than the outer diameter of the support portion 31. In this case, the spacer 50 can effectively press the first current collector 30 downward.

[0150] In another aspect of this disclosure, the spacer 50 may be configured to cover at least a portion of the welded portion BD formed by welding between the uncoated area connecting portion 32 of the first current collector 30 and the first uncoated area 11. For example, see reference to Figure 4a and Figure 4b The radius of the upper end of the spacer 50 facing the first current collector 30 can be greater than the distance from the welded portion BD closest to the core of the electrode assembly 10 to the core of the electrode assembly 10. The radial width of the area where the spacer 50 and the welded portion BD overlap can be at least 5%, preferably at least 10%, and more preferably at least 20% of the total radial width of the welded portion BD. In this case, for example, the spacer 50 can effectively prevent damage to the welded portion of the first current collector 30 and the first uncoated area 11 during the edge-rolling or shaping process.

[0151] In another aspect of this disclosure, the spacer 50 may be positioned further inward than the vent portion 41 toward the core, without covering the vent portion 41 of the cap 40. For example, see reference... Figure 4a and Figure 4c The radius of the spacer 50 facing the lower end of the cap 40 can be smaller than the distance from the center of the cap 40 to the exhaust section 41. This is to prevent the rupture pressure of the exhaust section 41 from differing from the design value due to the spacer 50 covering the exhaust section 41.

[0152] In another aspect of this disclosure, the spacer 50 may have an approximately cylindrical shape. For example, in Figure 2 In the cross-sectional view, it can be seen that the spacer 50 is semi-cylindrical. However, the shape of the spacer 50 is not limited to this. For example, the spacer 50 can have a polygonal prism shape. In this case, the distance from the center of the spacer 50 to the vortex of the polygon of the spacer 50 can be approximately equal to or greater than the radius of the support portion 31. On the other hand, the distance from the center of the spacer 50 to the vortex of the polygon of the spacer 50 can be greater than the distance from the welding portion closest to the core of the electrode assembly 10 to the core of the electrode assembly 10. On yet another aspect, the distance from the center of the spacer 50 to the vortex of the polygon of the spacer 50 can be less than the distance from the center of the cap 40 to the exhaust portion 41.

[0153] Alternatively, the spacer 50 may have a columnar shape with a uniform height and a closed curve in a horizontal cross-section. In this case, the distance from the spacer to its farthest point from the center may be approximately equal to or greater than the radius of the support portion 31. On the other hand, the distance from the spacer to its farthest point from the center may be greater than the distance from the welded portion closest to the core of the electrode assembly 10 to the core of the electrode assembly 10. In yet another aspect, the distance from the spacer to its farthest point from the center may be less than the distance from the center of the cap 40 to the vent portion 41.

[0154] Furthermore, the spacer 50 can be made of a material with elastic properties. For example, the spacer 50 can include an insulating polymer material. Therefore, when vibration and external impact are applied to the battery 1, the spacer 50 can absorb the impact and, after being compressed, recover to its original state through its elastic properties. Thus, when vibration and external impact are applied to the battery 1, damage to the internal components of the battery 1 can be minimized.

[0155] Reference Figure 1 , Figure 2 and Figure 7a Terminal 60 is electrically connected to the second uncoated area 12 of electrode assembly 10. Terminal 60 may be positioned opposite the opening portion of housing 20 and electrically connected to the second electrode. Specifically, for example, terminal 60 may extend substantially through the center of the closed portion on top of housing 20. A portion of terminal 60 may be exposed outside the top of housing 20, and other portions may be disposed within housing 20. For example, terminal 60 may be riveted to the inner surface of the closed portion of housing 20. That is, a riveting jig may be used to bend the edge of terminal 60 and rivet it to the inner surface of the closed portion of housing 20 by plastic deformation of the lower edge.

[0156] As described above, in this disclosure, since the housing 20 is electrically connected to the first uncoated area 11 of the electrode assembly 10, the closed portion on top of the housing 20 can serve as a first electrode terminal 20a having a first polarity. Conversely, since the terminal 60 is electrically connected to the second uncoated area 12 of the electrode assembly 10, the terminal 60 exposed outside the housing 20 can serve as a second electrode terminal.

[0157] In other words, the battery 1 of this disclosure has a structure in which a pair of electrode terminals 60, 20a are in the same direction. Therefore, when multiple batteries 1 are electrically connected, electrical connection components such as busbars can be placed only on one side of the battery 1. This simplifies the battery pack structure and increases energy density. Additionally, since the battery 1 has a structure in which a surface of the housing 20 with a generally flat shape can be used as the first electrode terminal 20a, sufficient contact area can be ensured when electrical connection components such as busbars are joined to the first electrode terminal 20a. Therefore, the battery 1 can have sufficient contact strength between the electrical connection components and the first electrode terminal 20a and reduce the resistance at the joint to a desired level.

[0158] As described above, when terminal 60 functions as the second electrode terminal, terminal 60 is electrically isolated from housing 20, which has a first polarity. Electrical insulation between housing 20 and terminal 60 can be achieved by various methods. For example, insulation can be achieved by inserting an insulating washer G between terminal 60 and housing 20. Alternatively, insulation can be achieved by forming an insulating coating layer in a portion of terminal 60. Alternatively, terminal 60 and housing 20 can be spaced apart to prevent them from contacting each other, and terminal 60 can be structurally securely fixed. Alternatively, two or more of the methods described above can be applied together.

[0159] Furthermore, when the insulating washer G is used for electrical insulation and the terminal 60 is fixed by riveting, the insulating washer G can be bent toward the inner surface of the closed portion on top of the housing 20 because it is compressed and deformed together with the terminal 60 during riveting. When the insulating washer G is made of resin material, it can be joined to the housing 20 and the terminal 60 by heat melting. In this case, the sealing performance at the connection interface between the insulating washer G and the terminal 60, as well as at the connection interface between the insulating washer G and the housing 20, can be enhanced.

[0160] Reference Figure 2 and Figure 7a The second current collector 70 is attached to the top of the electrode assembly 10. The second current collector 70 is made of a metal with conductive properties and is attached to the second uncoated area 12. For example, the connection between the second uncoated area 12 and the second current collector 70 can be accomplished by laser welding.

[0161] Reference Figure 2 and Figure 7a The insulator 80 is located between the closure portion on top of the housing 20 and the top of the electrode assembly 10, or between the closure portion and the second current collector 70. The insulator 80 may be made of, for example, a resin material with insulating properties. The insulator 80 prevents contact between the electrode assembly 10 and the housing 20 and / or between the electrode assembly 10 and the second current collector 70.

[0162] Additionally, the insulator 80 may be located between the top of the outer peripheral surface of the electrode assembly 10 and the inner surface of the housing 20. In this case, a short circuit can be prevented due to contact between the second uncoated area 12 of the electrode assembly 10 and the inner surface of the sidewall of the housing 20.

[0163] The insulator 80 may have a height corresponding to the distance between the closed portion on top of the housing 20 and the electrode assembly 10, or the distance between the closed portion and the second current collector 70. In this case, movement of the electrode assembly 10 within the housing 20 can be prevented, thereby significantly reducing the possibility of damage to the connection used for electrical connection between components. When the insulator 80 is used together with the spacer 50, the effect of preventing movement of the electrode assembly 10 can be maximized.

[0164] In this disclosure, the insulator 80 can be made of a material with elastic properties. For example, the insulator 80 may comprise an insulating polymer material. Therefore, when vibration and external impact are applied to the battery 1, the insulator 80 can absorb the impact while recovering to its original state after compression through its elastic properties. Thus, when vibration and external impact are applied to the battery 1, damage to the internal components of the battery 1 can be minimized.

[0165] In another aspect of this disclosure, the insulator 80 may have an opening at a position corresponding to the winding center hole C of the electrode assembly 10. Through this opening, the battery terminal 60 can directly contact the second current collector 70.

[0166] Furthermore, the bottom surface of the terminal 60, which contacts the top surface of the second current collector 70, can be welded to the second current collector 70. Specifically, the terminal 60 can be welded to the center of the second current collector 70. For example, refer to... Figure 7b Welding between terminal 60 and second current collector 70 can be performed by inserting a welding rod or laser welding beam through the winding center hole C1 and the first current collector hole H1. Welding methods may include, for example, laser welding, resistance welding and ultrasonic welding, but are not limited thereto.

[0167] Reference Figure 7b The battery 1 according to an embodiment of the present disclosure may further include a side cover 90. The side cover 90 may cover at least a portion of the outer peripheral surface of the electrode assembly 10. The side cover 90 may contact at least a portion of the housing 20. For example, the side cover 90 may contact the inner peripheral surface of the housing 20. Preferably, the side cover 90 may cover at least a portion of the outer peripheral surface of the electrode assembly 10 along its outer periphery. That is, the side cover 90 may be located between the outer peripheral surface of the electrode assembly 10 and the inner peripheral surface of the housing 20. In this case, the side cover 90 may have a thickness corresponding to the distance between the outer peripheral surface of the electrode assembly 10 and the inner peripheral surface of the housing 20. For example, refer to… Figure 7b To explain, the thickness of the side cover 90 is approximately equal to the distance between the outer peripheral surface of the electrode assembly 10 and the inner peripheral surface of the housing 20.

[0168] This structural feature of the side cover 90 allows the space between the outer peripheral surface of the electrode assembly 10 and the inner peripheral surface of the housing 20 to be filled. Therefore, when vibration and external impacts are applied to the battery 1, the movement of the electrode assembly 10 within the housing 20 can be minimized, thereby preventing damage to the electrical connections. In other words, the side cover 90 improves the battery 1's resistance to horizontal vibrations.

[0169] In another aspect of this disclosure, although not shown in the drawings, the side cover 90 may have an end that contacts the bent end of the insulator 80. Furthermore, the side cover 90 may be integrally formed with the bent end of the insulator 80. That is, the side cover 90 may be connected to and integrally formed with the insulator 80. With this structure, the empty space between the outer peripheral surface of the electrode assembly 10 and the inner peripheral surface of the housing 20 can be further reduced, thereby further improving vibration resistance.

[0170] Furthermore, the side cover 90 can be made of a material with elastic properties. For example, the side cover 90 may include an insulating polymer material. Therefore, when vibration and external impact are applied to the battery 1, the side cover 90 can absorb the impact and, after being compressed, return to its original state through its elastic properties. Thus, when vibration and external impact are applied to the battery 1, damage to the internal components of the battery 1 can be minimized.

[0171] Reference Figure 4a and Figure 5 A sealing gasket 100 can be positioned between the housing 20 and the cap 40 to ensure a seal between them. Specifically, the sealing gasket 100 can have a generally annular shape surrounding the cap 40. The sealing gasket 100 can simultaneously cover the lower surface, upper surface, and sides of the cap 40. The radial length of the area of ​​the sealing gasket 100 covering the upper surface of the cap 40 can be equal to or less than the radial length of the area of ​​the sealing gasket 100 covering the lower surface of the cap 40. When the radial length of the area of ​​the sealing gasket 100 covering the upper surface of the cap 40 is too long, the first current collector 30 or the housing 20 may be damaged during the shaping process of vertically compressing the housing 20 due to the pressure applied to the first current collector 30 by the sealing gasket 100. Therefore, the radial length of the area of ​​the sealing gasket 100 covering the upper surface of the cap 40 is preferably small to a predetermined level.

[0172] The battery 1 disclosed herein has the following structure: resistance is minimized by increasing the welding area through a curved surface, using the current path diversity of the first current collector 30, and minimizing the current path length. The AC resistance of the battery 1, measured by a ohmmeter between the positive and negative terminals and between the terminal 60 and the surrounding flat outer surface, can be approximately 0.5 milliohms to 4 milliohms, and preferably approximately 1 milliohm to 4 milliohms, suitable for fast charging.

[0173] Preferably, the battery may have a form factor ratio greater than about 0.4 (a value obtained by dividing the diameter of the battery by its height, i.e., defined as the ratio of diameter Φ to height H). Here, the form factor refers to the value representing the diameter and height of the battery.

[0174] Preferably, the battery may have a diameter of approximately 40 mm to 50 mm and a height of approximately 60 mm to 130 mm. Batteries according to embodiments of this disclosure may be, for example, 46110, 4875, 48110, 4880, or 4680 batteries. In the numbers representing the form factor, the first two digits represent the diameter of the battery, and the remaining digits represent the height of the battery.

[0175] When an electrode assembly with a jointless structure is applied to a battery with a form factor ratio of 0.4 or higher, the stress applied in the radial direction when bending the uncoated area is so great that the uncoated area tears. Additionally, in order to ensure sufficient weld strength and reduce resistance when welding the current collector to the curved surface region of the uncoated area, it is necessary to significantly increase the number of layers of uncoated area at the curved surface region. These requirements can be achieved by electrodes and electrode assemblies according to embodiments (variations) of this disclosure.

[0176] According to embodiments of the present disclosure, the battery may be a generally cylindrical battery having a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of about 0.418.

[0177] According to another embodiment, the battery may be a generally cylindrical battery with a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of about 0.640.

[0178] According to another embodiment, the battery may be a generally cylindrical battery with a diameter of about 48 mm, a height of about 110 mm, and a form factor of about 0.436.

[0179] According to another embodiment, the battery may be a generally cylindrical battery with a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of about 0.600.

[0180] According to another embodiment, the battery may be a generally cylindrical battery with a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of about 0.575.

[0181] Traditionally, a shape-to-size ratio of 0.4 or higher has been used. That is, for example, 1865 and 2170 batteries have been used. An 1865 battery has a diameter of approximately 18 mm, a height of approximately 65 mm, and a shape-to-size ratio of approximately 0.277. A 2170 battery has a diameter of approximately 21 mm, a height of approximately 70 mm, and a shape-to-size ratio of approximately 0.300.

[0182] Reference Figure 9 Multiple batteries 1 can be connected in series and parallel using busbars 150 on the batteries 1. The number of batteries 1 can be less or more, depending on the capacity of the battery pack.

[0183] In each battery 1, terminal 60 may have a positive polarity, and the outer surface of the closed portion of housing 20 may have a negative polarity, or vice versa.

[0184] Preferably, the multiple batteries 1 can be arranged in multiple columns and rows. Columns are vertical in the figures, while rows are horizontal. Additionally, to maximize space efficiency, the batteries 1 can be arranged in the most compact packaging structure. The most compact packaging structure is formed by connecting the centers of the terminals 60 exposed outside the housing 20 into an equilateral triangle. Preferably, busbars 150 can be arranged above the multiple batteries 1, more preferably between adjacent columns. Alternatively, busbars 150 can be located between adjacent rows.

[0185] Preferably, the busbar 150 connects batteries 1 arranged in the same column in parallel and connects batteries 1 arranged in two adjacent columns in series.

[0186] Preferably, the busbar 150 may include a main body 151, a plurality of first busbar terminals 152 and a plurality of second busbar terminals 153 for series and parallel connection.

[0187] The main body portion 151 may extend between the terminals 60 of adjacent batteries 1, and preferably between columns of batteries 1. Alternatively, the main body portion 151 may extend along the columns of batteries 1 and may be regularly (e.g., in a zigzag pattern).

[0188] Multiple first busbar terminals 152 can protrude and extend from one side of the body portion 151 toward the terminal 60 of each battery 1 and can be electrically connected to the terminal 60. The electrical connection between the first busbar terminals 152 and the terminal 60 can be achieved by laser welding and ultrasonic welding. Additionally, multiple second busbar terminals 153 can be electrically connected from the other side of the body portion 151 to the outer surface of each battery 1. The electrical connection between the second busbar terminals 153 and the outer surface can be achieved by laser welding and ultrasonic welding.

[0189] Preferably, the main body portion 151, the plurality of first busbar terminals 152, and the plurality of second busbar terminals 153 can be formed from a single conductive metal plate. The metal plate can be, for example, an aluminum plate or a copper plate, but this disclosure is not limited thereto. In a variation, the main body portion 151, the plurality of first busbar terminals 152, and the plurality of second busbar terminals 153 can be manufactured individually as pieces and then connected to each other, for example, by welding.

[0190] Since the battery 1 according to this disclosure includes a terminal 60 having a positive polarity in the same direction and the outer surface of a closed portion of a housing 20 having a negative polarity, an electrical connection of the battery 1 can be easily established using a busbar 150.

[0191] Additionally, since the outer surfaces of the terminals 60 of the battery 1 and the enclosed portion of the housing 20 have large areas, sufficient connection area of ​​the busbar 150 can be ensured, thereby significantly reducing the resistance of the battery pack including the battery 1.

[0192] Reference Figure 10 The battery pack 3 according to an embodiment of the present disclosure includes battery components and a battery pack housing 2 for housing secondary battery components. The battery pack includes a plurality of batteries 1 as described above, electrically connected to each other. Reference is made above for illustrative purposes. Figure 9 The electrical connection structure of multiple batteries 1 via a busbar is described, and for ease of illustration in the accompanying drawings, components such as cooling units and power terminals are omitted.

[0193] Reference Figure 11 The vehicle 5 according to embodiments of the present disclosure may be, for example, an electric vehicle, a hybrid electric vehicle, and a plug-in hybrid electric vehicle, and includes a battery pack 3 according to embodiments of the present disclosure. The vehicle 5 includes four-wheeled and two-wheeled vehicles. The vehicle 5 operates using electricity supplied from the battery pack 3 according to embodiments of the present disclosure.

[0194] While this disclosure has been described above with respect to a limited number of embodiments and accompanying drawings, this disclosure is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations can be made thereto within the technical aspects of this disclosure and within the equivalent scope of the appended claims.

Claims

1. A battery comprising: An electrode assembly comprising a first electrode, a second electrode, and a diaphragm located between the first electrode and the second electrode, the first electrode comprising a first uncoated region along the winding direction from which no active material layer is coated. A housing that accommodates the electrode assembly through an opening at its lower end; A first current collector is connected to the first uncoated area and disposed within the housing; A cap, used to cover the opening; and A spacer is located between the first current collector and the cap and has a height corresponding to the distance between the first current collector and the cap. The cap includes an exhaust portion with a smaller thickness compared to its surrounding area. The spacer is located further inside the core than the vent portion, so as not to cover the vent portion of the cap, and The first current collector contacts the housing and is electrically connected to the housing.

2. The battery of claim 1, wherein, The spacer is disposed on the central portion of one surface of the first current collector.

3. The battery according to claim 1, wherein, The first current collector includes: A support portion, which is disposed at the center portion of one surface of the electrode assembly; An uncoated area connection portion, which extends from the support portion and connects to the first uncoated area; and A housing contact portion that extends from the end of the support portion or the uncoated area connection portion and is electrically connected to the housing.

4. The battery according to claim 3, wherein, The spacer covers the support portion of the first current collector to prevent the support portion from being exposed outside the spacer.

5. The battery according to claim 3, wherein, The outer diameter of the upper end of the spacer facing the first current collector is equal to or greater than the outer diameter of the support portion.

6. The battery according to claim 3, wherein, The spacer covers at least a portion of the welded portion formed by welding the connection portion of the uncoated area of ​​the first current collector to the first uncoated area.

7. The battery according to claim 6, wherein, The radial width of the area where the spacer and the welded portion overlap is at least 5% of the total radial width of the welded portion.

8. The battery according to claim 6, wherein, The radius of the upper end of the spacer facing the first current collector is greater than the distance from the welded portion closest to the core of the electrode assembly to the core of the electrode assembly.

9. The battery according to claim 1, wherein, The venting section is configured to rupture when the internal pressure of the housing increases above a predetermined level.

10. The battery according to claim 1, wherein, The venting portion is a notch formed on at least one of the two surfaces of the cap.

11. The battery according to claim 1, wherein, The exhaust section forms a closed loop.

12. The battery according to claim 1, wherein, The exhaust section is circular.

13. The battery according to claim 1, wherein, The venting portion is closer to the end of the cap than the midpoint of the straight line connecting the center of the cap to the end of the cap.

14. The battery according to claim 1, wherein, The exhaust portion is formed along the edge of a flat area that protrudes downward from the edge region of the cap.

15. The battery according to claim 1, wherein, The radius of the spacer facing the lower end of the cap is smaller than the distance from the center of the cap to the exhaust portion.

16. The battery according to claim 1, wherein, The spacer includes a spacer hole at a position corresponding to the winding center hole of the electrode assembly.

17. The battery according to claim 3, wherein, The support portion includes a first current collector hole at a position corresponding to the winding center hole of the electrode assembly.

18. The battery according to claim 17, wherein, The spacer includes a spacer hole at a position corresponding to the winding center hole of the electrode assembly, and The winding center hole, the first current collector hole, and the spacer hole of the electrode assembly are on the same straight line.

19. The battery according to claim 1, further comprising: A side cover that covers at least a portion of the outer peripheral surface of the electrode assembly and contacts the inner peripheral surface of the housing.

20. The battery according to claim 19, wherein, The side cover covers at least a portion of the outer peripheral surface of the electrode assembly along its outer periphery.

21. The battery according to claim 20, wherein, The side cover has a thickness corresponding to the distance between the outer peripheral surface of the electrode assembly and the inner peripheral surface of the housing.

22. The battery according to claim 3, wherein, The housing includes: The pressure-fit portion is formed by press-fitting around the outer peripheral surface of the housing; and The rolled edge portion extends and bends such that the end defining the opening portion surrounds the edge of the cap below the rolled edge portion.

23. The battery according to claim 22, further comprising: A sealing gasket is located between the cap and the rolled edge portion of the housing to ensure the housing is airtight.

24. The battery according to claim 22, wherein, The housing contact portion contacts one surface of the pressing edge portion facing the cap.

25. The battery according to claim 1, wherein, The second electrode includes a second uncoated region along the winding direction where the active material layer is not coated.

26. The battery of claim 25, further comprising: A second current collector is connected to the second uncoated area; as well as An insulator is disposed between the closed portion located at the upper end of the housing and the second current collector.

27. The battery according to claim 26, wherein, The insulator has a height corresponding to the distance between the second current collector and the enclosed portion.

28. The battery according to claim 1, wherein, The spacer is made of a material with elastic properties.

29. The battery according to claim 1, wherein, The resistance measured between the positive and negative terminals is 4 milliohms or less.

30. The battery according to claim 1, wherein, The shape factor ratio is greater than 0.4, which is calculated by dividing the diameter of the battery by the height of the battery.

31. A battery pack comprising a plurality of batteries according to any one of claims 1 to 30.

32. The battery pack according to claim 31, wherein, The battery also includes a terminal opposite the opening and electrically connected to the second electrode.

33. The battery pack according to claim 32, wherein, The battery is configured as a plurality of batteries and the plurality of batteries are arranged in a predetermined number of columns, and The terminals and the outer surface of the enclosure of each battery are positioned upwards.

34. The battery pack of claim 33, wherein the battery pack comprises: Multiple busbars are used to connect the multiple batteries in series and in parallel. The plurality of busbars are arranged above the plurality of batteries, and Each bus bar includes: The main body extends between the terminals of adjacent batteries; A plurality of first busbar terminals, the plurality of first busbar terminals extending toward one side of the main body portion and electrically connected to terminals of a battery disposed on that side; and A plurality of second busbar terminals extend toward opposite sides of the main body portion and are electrically connected to the outer surface of an enclosed portion of a battery housing disposed on the opposite sides.

35. A vehicle comprising a battery pack according to any one of claims 31 to 34.

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