Battery and vehicle including the same

Abstract

A battery, a battery pack including the battery, and a vehicle. An embodiment of the present disclosure includes: an electrode assembly including a first electrode and a second electrode, and a separator disposed between the first electrode and the second electrode, the first electrode, the second electrode, and the separator being wound around a winding axis to define a core and an outer peripheral surface, wherein the first electrode and the second electrode each include a first uncoated region and a second uncoated region along the winding direction, and no active material layer coating is present in the first uncoated region and the second uncoated region; a housing receiving the electrode assembly through an opening formed at the bottom; a first current collector coupled to the first uncoated region and disposed within the housing; a cover covering the opening; a separator disposed between the cover and the electrode assembly to secure the electrode assembly and seal the housing; and a terminal electrically connected to a second uncoated region.

Description

Technical Field

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

[0002] In batteries, jelly rolls with positive and negative terminals extending upwards and downwards respectively along the longitudinal direction of the casing can be used to maximize current collection efficiency. In batteries using jelly rolls with this structure, current collectors can be used as a medium to connect the positive and negative terminals to the terminals and the casing, respectively.

[0003] In this configuration, for example, the positive current collector can be connected to the positive terminal while covering one surface of the winding core, and the negative current collector can be connected to the negative terminal while covering the other surface of the winding core. Additionally, the positive current collector can be electrically connected to a terminal, and the negative current collector can be electrically connected to the housing.

[0004] A battery with the above structure can have a relatively large empty space between the negative current collector and the cover. In addition, an empty space can be formed between the bottom of the casing, which is located opposite the cover, and the positive current collector.

[0005] These empty spaces may cause the winding core to move specifically along the vertical direction (i.e., the height direction of the battery) within the casing. When the winding core moves in the vertical direction, damage may occur at the connection between the current collector and the electrode terminals. In addition, damage may occur at the connection between the current collector and the casing, as well as at the connection between the current collector and the terminals.

[0006] Therefore, the movement space of the core must be minimized. Furthermore, applying additional components to reduce the core's movement space increases process complexity and manufacturing costs; therefore, it is necessary to solve the problem by utilizing existing components. Summary of the Invention

[0007] Technical issues

[0008] This disclosure is designed to solve the above-mentioned problems, and therefore aims to prevent damage to electrical connections due to movement of the core within the housing.

[0009] This disclosure also relates to preventing the movement of the winding core during battery manufacturing by utilizing existing components, thereby preventing increased manufacturing complexity and costs due to the application of additional components.

[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 other problems not mentioned herein based on the following description.

[0011] Technical solution

[0012] To address the aforementioned problems, a battery according to an embodiment of this disclosure includes: an electrode assembly comprising a first electrode and a second electrode, and a separator disposed between the first electrode and the second electrode, the first electrode, the second electrode, and the separator being wound around a winding axis to define a core and an outer peripheral surface, wherein the first electrode and the second electrode each include a first uncoated region and a second uncoated region along the winding direction, and no active material layer coating is present in the first uncoated region and the second uncoated region; a housing receiving the electrode assembly through an opening formed at the bottom; a first current collector coupled to the first uncoated region and disposed within the housing; a cover covering the opening; a separator inserted between the cover and the electrode assembly to secure the electrode assembly and seal the housing; and a terminal electrically connected to the second uncoated region.

[0013] The separator may include: a movement prevention portion located between the first collector and the cover; a sealing portion located between the housing and the cover; and a connecting portion connecting the movement prevention portion to the sealing portion.

[0014] The height of the movement prevention section can correspond to the distance between the first collector and the cover.

[0015] The movement prevention portion may be located at the center of one surface of the electrode assembly.

[0016] The movement prevention portion may include a separator hole at a position corresponding to the winding center hole of the electrode assembly.

[0017] The sealing portion may extend along the inner circumference of the housing.

[0018] The housing may include: a rolled edge portion formed by pressing an outer periphery; and a curled portion below the rolled edge portion, wherein the end of the curled portion defining the opening extends and bends to surround the edge of the cover.

[0019] The sealing portion can bend along the curled portion and around the edge of the cover.

[0020] The connecting portion may include a plurality of extension legs extending from the moving portion in a radial or cross shape or a combination thereof.

[0021] The plurality of extension legs can be configured to avoid contact with the first collector.

[0022] The plurality of extension legs can be configured to maintain a distance from the cover.

[0023] The first current collector may include: a support portion located at the center of the surface of the electrode assembly; an uncoated area connection portion extending from the support portion and connected to the first uncoated area; and a housing contact portion extending from the end of the support portion or the uncoated area connection portion and inserted between the housing and the sealing portion.

[0024] The support portion may include a first collector hole at a position corresponding to the winding center hole of the electrode assembly.

[0025] The housing may include: a rolled edge portion, a portion of the sidewall of which is pressed inward; and a curled portion below the rolled edge portion, the end of which defines the opening extending and bending to surround the edge of the cover. In this configuration, the housing contact portion may contact the surface of the rolled edge portion facing the cover.

[0026] The sealing portion can be bent along the curled portion and fill the space between the housing contact portion and the cover while surrounding the edge of the cover.

[0027] The thickness of the sealing portion between the outer casing contact portion and the cover can be smaller than the thickness between the rolled edge portion and the cover.

[0028] The compression ratio of the sealing portion between the outer shell contact portion and the cover can be greater than the compression ratio of the sealing portion between the rolled edge portion and the cover.

[0029] The compression ratio of the sealing portion between the outer shell contact portion and the cover can be equal to the compression ratio of the sealing portion between the rolled edge portion and the cover.

[0030] The movement prevention portion may cover the support portion to prevent the support portion from being exposed to the outside of the movement prevention portion.

[0031] The cover may include an exhaust portion, the thickness of which is less than that of its surrounding area, and the movement prevention portion may be located further inward than the exhaust portion to prevent the movement prevention portion from covering the exhaust portion.

[0032] The connecting portion may not overlap with the contact portion of the outer casing along the height direction of the battery.

[0033] The battery may further include: a second current collector connected to the second uncoated area; and an insulating element inserted between the closed portion at the top of the housing and the second current collector.

[0034] The height of the insulating element can correspond to the distance between the second current collector and the enclosed portion.

[0035] To address the aforementioned problems, a battery pack according to an embodiment of the present disclosure includes a plurality of batteries as described above according to an embodiment of the present disclosure.

[0036] The plurality of batteries can be arranged in a predetermined number of columns, and in this case, the terminals and the outer surface of the enclosed portion of the housing of each battery can be arranged facing upwards.

[0037] The battery pack may include multiple busbars to connect the multiple batteries in series and in parallel, and the multiple busbars may be arranged on the multiple batteries. In this case, each busbar may include: a body portion extending between terminals of adjacent batteries; a plurality of first busbar terminals extending in the direction of the body portion and electrically connected to terminals of the batteries disposed in the direction; and a plurality of second busbar terminals extending in the opposite direction of the body portion and electrically connected to the outer surface of the enclosed portion of the battery housing disposed in the opposite direction.

[0038] To address the aforementioned problems, a vehicle according to an embodiment of the present disclosure includes a battery pack as described in an embodiment of the present disclosure.

[0039] Furthermore, according to another aspect, in order to solve the above-mentioned problems, a battery according to an embodiment of the present disclosure may include: an electrode assembly including a first uncoated area and a second uncoated area; a housing receiving the electrode assembly through an opening formed at the bottom; a first current collector coupled to the first uncoated area in the housing; and a separator including a central portion supporting the bottom of the first current collector and a peripheral portion contacting the housing.

[0040] The battery may also include terminals that are electrically connected to the second uncoated area.

[0041] The upper surface of the central portion can be positioned higher than the upper surface of the peripheral portion.

[0042] The central portion may include a separator hole at a position corresponding to the winding center hole of the electrode assembly.

[0043] The peripheral portion may extend to the inner surface of the housing.

[0044] The separator may also include a flange extending downward from the outer edge of the peripheral portion.

[0045] The battery may further include: a cover that covers an opening at the lower end of the housing, and the upper surface of the central portion may contact the lower surface of the first current collector, and the lower surface of the central portion may contact the inner surface of the cover.

[0046] In addition, to address the aforementioned problems, a method for manufacturing a battery according to an embodiment of the present disclosure includes the following steps: inserting an electrode assembly into a housing; placing a current collector on the bottom surface of the electrode assembly; arranging a separator in contact with the current collector; sealing the housing with the edge of the separator; and attaching a cover to the housing.

[0047] The method of manufacturing the battery may further include attaching the cover to the edge of the separator such that the separator extends from the cover to the current collector.

[0048] The sealing edge of the housing of the separator can extend in a circumferential direction.

[0049] Beneficial effects

[0050] According to one aspect of this disclosure, movement of the core within the housing can be minimized, thereby preventing damage to the electrical connections.

[0051] According to another aspect of this disclosure, increased manufacturing complexity and costs can be prevented by utilizing existing components instead of applying additional components to prevent core movement. Attached Figure Description

[0052] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the following detailed description of the present disclosure, are intended to provide a further understanding of the technical aspects of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the drawings.

[0053] Figure 1 This is a perspective view showing a cylindrical battery according to an embodiment of the present disclosure.

[0054] Figure 2 This is a cross-sectional view showing the internal structure of a cylindrical battery according to an embodiment of the present disclosure.

[0055] Figure 3 This is a perspective view showing an exemplary shape of the first current collector applied to this disclosure.

[0056] Figure 4 This is a partial cross-sectional view showing the area where the integral separator of this disclosure is applied.

[0057] Figure 5 This is a diagram showing the separator according to this disclosure.

[0058] Figure 6 This is a bottom view of the cylindrical battery disclosed herein.

[0059] Figure 7 This is a partial cross-sectional view showing the area where the insulating element of this disclosure is applied.

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

[0061] Figure 9 This is a top view showing a plurality of cylindrical cells 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] [Explanation of reference numerals in the attached figures]

[0065] 5: Vehicles

[0066] 3: Battery Pack

[0067] 2: Battery pack casing

[0068] 1: Cylindrical battery

[0069] 10: Electrode Assembly

[0070] 11: First uncoated area

[0071] 12: Second uncoated area

[0072] C: Center hole of winding

[0073] 20: Outer shell

[0074] 20a: First electrode terminal

[0075] 21: Curled edge section

[0076] 22: Curled section

[0077] 30: First collector

[0078] 31: Supporting part

[0079] 32: Uncoated area connection portion

[0080] 33: Contact area of ​​the outer casing

[0081] H1: First collector port

[0082] 40: Cover

[0083] 41: Exhaust section

[0084] 50: Separator

[0085] 51: Movement prevention section

[0086] H2: Separator hole

[0087] 52: Sealing part

[0088] 53: Connection part

[0089] 53a: Extended Leg

[0090] 60: Terminal (Second Electrode Terminal)

[0091] G: Insulating gasket

[0092] 70: Second collector

[0093] 80: Insulating components Detailed Implementation

[0094] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before proceeding with the 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 or dictionary meanings, but rather should be interpreted based on the principles that enable the inventor to define terms suitable for best description, and on the meanings and concepts corresponding to the technical aspects of the present disclosure. Therefore, the embodiments described herein and the illustrations shown in the accompanying drawings are merely some of the most preferred embodiments of the present disclosure and are not intended to fully describe the technical aspects of the present disclosure. It should be understood that various other equivalents and modifications thereof may be formed at the time of filing this application.

[0095] Furthermore, to aid in understanding this disclosure, some elements may be illustrated at exaggerated dimensions rather than to actual scale in the accompanying drawings. Additionally, the same elements in different embodiments may be given the same reference numerals.

[0096] The term "equal" means "substantially equal." Therefore, substantially equal can include deviations considered low in the corresponding technical field, such as 5% or less. Additionally, a uniform parameter within a predetermined region can refer to uniformity from an average perspective.

[0097] The terms “first,” “second,” etc., are used to describe various elements, which are not limited by these terms. These terms are used to distinguish one element from another, and unless the context clearly indicates otherwise, a first element may be a second element.

[0098] As used herein, the singular form is intended to include the plural form as well, unless the context explicitly indicates otherwise.

[0099] It will be understood that when an element is referred to as being "above (or below)" or "over (or under)" another element, it can be positioned to contact the upper (or lower) surface of the other element, but other elements can be positioned between the element and the other element above (or below) the element.

[0100] It will also be understood that when elements are referred to as “connected,” “joined,” or “joined” to another element, these elements may be directly connected or joined to each other, but there may be intermediate elements between them, or each element may be “connected,” “joined,” or “joined” to each other through another element.

[0101] Unless the context clearly indicates otherwise, “A and / or B” means A, B, or A and B, and “C to D” means C or greater and D or less.

[0102] Reference Figure 1 and Figure 2 According to embodiments of the present disclosure, the battery 1 can be a cylindrical battery. The cylindrical battery 1 includes an electrode assembly 10, a casing 20, a first current collector 30, a cover 40, a separator 50, and terminals 60. In addition to the above-described components, the cylindrical battery 1 may also include an insulating gasket G and / or a second current collector 70 and / or an insulating member 80. This disclosure is not limited to the shape of the battery and can be applied to batteries of other shapes (e.g., prismatic batteries).

[0103] Reference Figure 2 , Figure 4 , Figure 7 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 electrode and the second electrode. The first electrode corresponds to a negative or positive electrode, and the second electrode corresponds to an electrode having the opposite polarity to the first electrode.

[0104] The electrode assembly 10 can have, for example, a core shape. That is, the electrode assembly 10 can be manufactured by winding a stack formed by sequentially stacking a first electrode, a diaphragm, and a second electrode at least once. The core-type electrode assembly 10 can have a winding center hole C at its center, which extends along the height direction (parallel to the Z-axis). In addition, an additional diaphragm can be provided on the outer peripheral surface of the electrode assembly 10 to insulate it from the housing 20.

[0105] The first electrode includes a first conductive substrate and a first electrode active material layer formed on one or both surfaces of the first conductive substrate. An uncoated region of the first electrode, 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 can serve as a first electrode connector. The uncoated region 11 is disposed on one surface of the electrode assembly 10. More specifically, the uncoated region 11 is disposed below the electrode assembly 10 housed within the housing 20 in the height direction (parallel to the Z-axis).

[0106] The second electrode includes a second conductive substrate and a second electrode active material layer formed on one or both surfaces of the second conductive substrate. An uncoated area of ​​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 area extends from one end to the other along the length direction of the second electrode. The uncoated area 12 can serve as a second electrode connector. The uncoated area 12 is disposed on another surface of the electrode assembly 10. More specifically, the uncoated area 12 is disposed on the electrode assembly 10 housed within the housing 20 in the height direction (parallel to the Z-axis).

[0107] That is, 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 cylindrical cell 1) and are exposed to the outside of the separator.

[0108] In addition, refer to Figure 8At least a portion of the first uncoated region 11 and / or the second uncoated region 12 may include multiple segments F divided along the winding direction of the electrode assembly 10. In this case, the multiple segments may be bent along the radial direction of the electrode assembly 10. The multiple bent segments may overlap in multiple layers. 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 multiple segments F overlap in multiple layers. Furthermore, the electrode assembly 10 may have a target welding region in which the number of overlapping layers of the segments F of the first uncoated region 11 remains consistent along the radial direction of the electrode assembly 10. In this region, the number of overlapping layers remains approximately at its maximum value, so it may be advantageous to perform 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 in the aforementioned region, as described below. For example, in the case of laser welding, this prevents the electrode assembly 10 from being damaged by the laser beam passing through the first uncoated region 11 and / or the second uncoated region 12 when the laser output is increased to improve the welding quality. In addition, this effectively prevents impurities such as welding slag from entering the electrode assembly 10.

[0109] 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, but are not limited to, any active material known in the corresponding art field related to this disclosure.

[0110] In the example, the positive electrode active material may include materials of the general 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; the stoichiometric coefficients of the components included in x, y, z and M are selected to maintain the electroneutrality of the compound).

[0111] In another example, the positive electrode active material may include the alkali metal compound xLiM disclosed in US6,677,082 and US6,680,143. 1 O2(1x)Li2M 2 O3 (M) 1 Includes at least one element with an average oxidation state of 3; M 2 Includes at least one element with an average oxidation state of 4; 0 ≤ x ≤ 1).

[0112] In yet another example, the positive electrode active material may include materials of the general formula Li a M1 x Fe 1x M 2 y P 1y M 3 z O 4z (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 including F; 0 < a ≤ 2, 0 ≤ x ≤ 1, 0 ≤ y < 1, 0 ≤ z < 1; select a, x, y, z, M 1 、M 2 和M 3 and the stoichiometric coefficients of the compounds included in M are to maintain the electroneutrality of the compound) or a lithium metal phosphate represented by Li3M2(PO4)3 [M includes at least one selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg, and Al].

[0113] Preferably, the positive electrode active material may include primary particles and / or secondary particles formed by aggregation of primary particles.

[0114] In an example, the negative electrode active material may include a carbon material, a lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound. Metal oxides having a potential less than 2V such as TiO2 and SnO2 can be used for the negative electrode active material. The carbon material may include low-crystalline carbon and high-crystalline carbon.

[0115] For example, the separator may include a porous polymer membrane made of polyolefin polymers such as ethylene homopolymers, propylene homopolymers, ethylene / butene copolymers, ethylene / hexene copolymers, and ethylene / methacrylate copolymers used alone or their stacks. In another example, the separator may include a commonly used porous non-woven fabric, for example, a non-woven fabric made of high-melting-point glass fibers and polyethylene terephthalate fibers.

[0116] The coating of inorganic particles may be included on at least one surface of the separator. Additionally, the separator itself may be a coating of inorganic particles. The particles forming the coating may have an adhesive structure with an adhesive to form an interstitial volume between adjacent particles.

[0117] Inorganic particles may include inorganic particles with a dielectric constant of 5 or greater. Non-limiting examples of inorganic particles may include those derived from Pb(Zr,Ti)O3(PZT), Pb... 1x La x Zr 1y Ti y O3(PLZT), PB(Mg3Nb) 2 / 3 At least one material selected from the group consisting of PbTiO3 (PMNPT), BaTiO3, hafnium dioxide (HfO2), SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO and Y2O3.

[0118] Electrolytes can be those with properties such as A + B - Salts with this structure. Here, A + Including, for example, Li + Na + K + Such alkali metal cations or combinations thereof. B - Including from 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 - At least one anion selected from the group.

[0119] Electrolytes can be used by dissolving them in organic solvents. Organic solvents may include at least one of propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), or γ-butyrolactone.

[0120] Reference Figure 1 , Figure 2 , Figure 4 and Figure 7 The housing 20 houses the electrode assembly 10 through an opening formed at the bottom. The housing 20 is a generally cylindrical housing structure with an opening at the bottom and a closed portion at the top. The housing 20 can be made of a material with conductive properties, such as metal. The material of the housing 20 can be, for example, aluminum. The sides (outer peripheral surfaces) and the top surface of the housing 20 can be integrally formed. The top surface of the housing 20 (the surface parallel to the XY plane) can have a generally flat shape. The housing 20 houses the electrolyte and the electrode assembly 10 together through the opening formed at the bottom.

[0121] 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 has the same polarity as the first uncoated region 11.

[0122] Reference Figure 2 and Figure 4 The housing 20 may include a rolled edge portion 21 and a curled portion 22 formed at its lower end. The rolled edge portion 21 is disposed below the electrode assembly 10 housed within the housing 20. The rolled edge portion 21 is formed by press-fitting the outer periphery of the housing 20. The rolled edge portion 21 may partially reduce the inner diameter of the housing 20 to prevent the electrode assembly 10, whose dimensions substantially correspond to the width of the housing 20, from dislodging from an opening formed at the bottom of the housing 20. The rolled edge portion 21 may also serve as a support for the housing 40.

[0123] The curled portion 22 is formed below the rolled edge portion 21. The curled portion 22 extends and bends such that the end of the housing defining the opening of the housing 10 surrounds the periphery of the cover 40, and the periphery of the separator 50 is inserted therebetween.

[0124] Reference Figures 2 to 4 The first current collector 30 can be coupled to the first uncoated area 11 of the electrode assembly 10 and is disposed within the housing 20. The first current collector 30 covers at least a portion of a surface of the bottom 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 formed in 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 a medium for the electrical connection between the electrode assembly 10 and the housing 20.

[0125] 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. The support portion 31 is disposed approximately at the center of a surface formed at 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 formed at a position corresponding to the winding center hole C of the electrode assembly 10. As described below, the first current collector hole H1 may serve as a channel for inserting a soldering electrode connected between the terminal 60 and the second current collector 70 or as a channel for laser radiation. Furthermore, when an electrolyte solution is injected, the first current collector hole H1 may serve as a channel for the electrolyte solution to smoothly penetrate into the electrode assembly 10.

[0126] The uncoated area connection portion 32 extends from the support portion 31 and connects to the first uncoated area 11. For example, multiple uncoated area connection portions 32 may exist. In this case, each of the multiple uncoated area connection portions 32 may extend radially from the support portion 31. The housing contact portion 33 may be as follows: Figure 3 The portion shown extends from the support portion 31, or is connected to it. Figure 3 In contrast, the housing contact portion 33 may extend from the end of the uncoated area connection portion 32. The end of the housing contact portion 33 may contact the housing 20 between the sealing portion 52 of the separator 50 and the housing 20 as described below, thereby establishing 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 rolled edge portion 21 facing the cover 40.

[0127] For example, multiple housing contact portions 33 may exist. In this case, the multiple housing contact portions 33 can 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 disposed between adjacent uncoated area connecting portions 32. Alternatively, with Figure 3 In contrast, 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.

[0128] Reference Figure 2 , Figure 4 and Figure 6 The cover 40 covers the opening formed in the housing 20. For example, the cover 40 may be made of a metallic material to ensure rigidity. The cover 40 forms the lower surface of the cylindrical battery 1. In the cylindrical battery 1 of this disclosure, even when the cover 40 is made of a metallic material with conductive properties, the cover 40 may be non-polarized. Non-polarization means that the cover 40 is electrically insulated from the housing 20 and the terminal 60. Therefore, the cover 40 does not act as a positive or negative terminal. Therefore, the cover 40 does not need to be electrically connected to the electrode assembly 10 and the housing 20, and the cover 40 does not necessarily need to be made of a conductive metal.

[0129] When the housing 20 of this disclosure includes a rolled edge portion 21, the cover 40 can be disposed on the rolled edge portion 21 formed in the housing 20. Alternatively, when the housing 20 of this disclosure includes a curled portion 22, the cover 40 is secured by the curled portion 22. The periphery of the separator 50 is inserted between the cover 40 and the curled portion 22 of the housing 20 to ensure the sealability of the housing 20.

[0130] Reference Figure 4 and Figure 6 The cover 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 in the cover 40 that is thinner than other regions. The venting portion 41 is structurally more fragile than any other region. Therefore, when the internal pressure of the housing 20 rises above a predetermined level due to an anomaly in the cylindrical battery 1, the venting portion 41 may rupture, thereby forcing the gas generated in the housing 20 to escape. For example, the venting portion 41 may be formed by slotting one or both surfaces of the cover 40 to partially reduce the thickness of the housing 20.

[0131] like Figure 7 As shown, the lower end of the cover 40 is preferably positioned higher than the lower end of the housing 20. In this case, even when the lower end of the housing 20 contacts the bottom surface or bottom of the housing to form a module or assembly, the cover 40 does not contact the bottom surface or bottom of the housing. Therefore, it is possible to prevent the pressure required for the venting portion 41 to rupture from being different from the design value due to the weight of the cylindrical battery 1, thereby allowing the venting portion 41 to rupture smoothly.

[0132] Furthermore, when the exhaust section 41 has such Figure 4 and Figure 6In the closed-loop shape shown, the longer distance from the center of the cover 40 to the exhaust portion 41 is more advantageous in terms of ease of rupture. When the same exhaust pressure is applied, the greater the distance from the center of the cover 40 to the exhaust portion 41, the greater the force applied to the exhaust portion 41, making rupture easier. Additionally, the longer distance from the center of the cover 40 to the exhaust portion 41 is more advantageous in terms of smooth exhaust gas discharge. From this perspective, it is advantageous that the exhaust portion 41 extends downwards from the peripheral region of the cover 40 (based on...). Figure 4 The periphery of a roughly flat area is formed.

[0133] although Figure 6 An exhaust portion 41, which is continuously formed in a generally circular shape, is shown, but the present disclosure is not limited thereto. The exhaust portion 41 may be formed discontinuously in a generally circular shape on the cover 40, and may be formed in a generally straight shape or other shapes.

[0134] Reference Figure 2 , Figure 4 and Figure 5 The separator 50 is configured to prevent movement of the electrode assembly 10 and enhance the sealability of the housing 20. Specifically, the separator 50 is inserted between the cover 40 and the electrode assembly 10 to secure the electrode assembly 10 and seal the housing 20. The separator 50 may include a central portion supporting the bottom of the first current collector 30 and a peripheral portion contacting the housing 20. In this case, the upper surface of the central portion may be positioned higher than the upper surface of the peripheral portion. The upper surface of the central portion may contact the lower surface of the first current collector 30, and the lower surface of the central portion may contact the inner surface of the cover 40. The central portion may include a separator hole H2 formed at a position corresponding to the winding center hole C of the electrode assembly 10. The peripheral portion may extend toward the inner surface of the housing 20. The separator 50 may also include a flange extending downward from the outer edge of the peripheral portion. In this case, when the housing 20 is rolled up, the flange may bend together with the housing 20, such that the flange is positioned around the edge of the cover 40.

[0135] On the other hand, the separator 50 may include, for example, a movement prevention portion 51, a sealing portion 52, and a connecting portion 53. The movement prevention portion 51 is inserted between the first current collector 30 and the cover 40. The height of the movement prevention portion 51 may correspond to the distance between the first current collector 30 and the cover 40. In this case, due to the gap formed between the first current collector 30 and the cover 40, the movement prevention portion 51 can effectively prevent the electrode assembly 10 from moving within the housing 20. Therefore, the movement prevention portion 51 can prevent damage to the connecting portion between the electrode assembly 10 and the first current collector 30 and / or the connecting portion between the first current collector 30 and the housing 20.

[0136] The movement prevention portion 51 can be disposed approximately at the center of a surface on the bottom of the electrode assembly 10. The movement prevention portion 51 can have a separator hole H2 formed 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 separator hole H2 can serve as an insertion channel for the welding electrode or a channel for laser radiation. Also similar to the first current collector hole H1 described above, the separator hole H2 can serve as a channel for the electrolyte solution to smoothly penetrate into the electrode assembly 10 when an electrolyte solution is injected.

[0137] Furthermore, the movement prevention portion 51 can cover the support portion 31 to prevent the support portion 31 of the first collector 30 from being exposed to the outside of the movement prevention portion 51. That is, the outer diameter of the top of the movement prevention portion 51 can be approximately equal to or greater than the outer diameter of the support portion 31. In this case, the movement prevention portion 51 can effectively press down the first collector 30.

[0138] On the other hand, the movement prevention portion 51 can be configured to cover at least a portion of the weld portion formed by welding the uncoated area connecting portion 32 of the first current collector 30 to the first uncoated area 11. That is, the radius of the top of the movement prevention portion 51 can be greater than the distance from the weld portion closest to the core of the electrode assembly 10 to the core of the electrode assembly 10. In this case, for example, during processes such as curling or sizing, the movement prevention portion 51 can effectively prevent damage to the weld portion of the first current collector 30 and the first uncoated area 11.

[0139] On the other hand, the movement prevention portion 51 can be positioned further inward toward the core, so as not to cover the vent portion 41 formed in the cover 40. That is, the radius measured at the top of the movement prevention portion 51 can be smaller than the distance from the center of the cover 40 to the vent portion 41. This is to prevent the vent portion 41 from being covered by the separator 50 and thus the rupture pressure of the vent portion 41 from differing from the design value.

[0140] A sealing portion 52 is inserted between the housing 20 and the cover 40. The sealing portion 52 may extend along the inner circumference of the housing 20. When the housing 20 includes a curled portion 22, the sealing portion 52 may be bent along the curved shape of the curled portion 22, such that the sealing portion 52 may be positioned around the peripheral region of the cover 40. Alternatively, the sealing portion 52 may be bent along the curled portion 22 to fill the space between the housing contact portion 33 and the cover 40 while surrounding the edge of the cover 40. As described above, the sealing portion 52 may act as a gasket to improve the retention of the cover 40 and the sealability of the housing 20.

[0141] Furthermore, the thickness of the sealing portion 52 between the housing contact portion 33 and the cover 40 can be smaller than the thickness between the crimped portion 21 and the cover 40. This is because, compared to other areas, the sealing portion 52 experiences more pressure in the area where the housing contact portion 33 is inserted between the cover 40 and the crimped portion 21. Therefore, the compression ratio of the sealing portion 52 between the housing contact portion 33 and the cover 40 is greater than that between the crimped portion 21 and the cover 40. In contrast, the sealing portion 52 can be configured such that the compression ratio between the housing contact portion 33 and the cover 40 is approximately equal to the compression ratio between the crimped portion 21 and the cover 40. In this case, a reduction in the sealability due to the different compression ratios in each area can be prevented.

[0142] The connecting portion 53 connects the movement prevention portion 51 to the sealing portion 52. For example, the connecting portion 53 may include a plurality of extension legs 53a extending from the movement prevention portion 51 in a radial or cross shape or a combination thereof. When the connecting portion 53 is configured as described above, an electrolyte solution can be well injected through the space between adjacent extension legs 53a, and internal gas can be released when venting occurs due to an increase in internal pressure.

[0143] like Figure 4 As shown, the multiple extension legs 53a can be configured to avoid contact with the portion of the first current collector 30 that is inserted between the coiled portion 22 and / or the cover 40, except for the portion where the housing contact portion 33 is inserted. For example, the connecting portion 53 may not overlap with the housing contact portion 33 along the height direction of the cylindrical battery 1 (parallel to the Z-axis). In particular, when the extension legs 53a extend radially from the movement prevention portion 51 and the multiple housing contact portions 33 extend radially from the support portion 31, the extension legs 53a and the housing contact portions 33 may be arranged in an interleaved pattern to prevent them from overlapping in the vertical direction. In this case, even if the shape of the component changes due to the compressive force applied to the housing 20 in the vertical direction, the possibility of interference between the extension legs 53a and the housing contact portions 33 can be significantly reduced, thereby significantly reducing the possibility of damage to the connection portion between the components.

[0144] In this configuration, even if the shape of the separator 50 changes due to dimensional adjustments made by pressing the cylindrical battery 1 along the height direction (parallel to the Z-axis) or other reasons, interference between the connecting portion 53 of the separator 50 and the housing contact portion 33 of the first current collector 30 can be minimized. Specifically, when the extension leg 53a is configured to avoid contact with the cover 40, the likelihood of shape changes in the extension leg 53a can be reduced even if the shape of the housing 20 changes due to dimensional adjustments or external impacts.

[0145] Furthermore, each element of the separator 50 can be integrally formed. For example, the movement prevention portion 51, the sealing portion 52, and the connecting portion 53 can be integrated into the separator 50 by injection molding. That is, the cylindrical battery 1 of this disclosure can achieve an enhanced sealing effect on the opening of the housing 20 and a movement prevention effect on the electrode assembly 10 by modifying the design of the gasket component used to seal the opening of the housing 20. Therefore, according to this disclosure, the increased manufacturing complexity and manufacturing cost caused by the application of additional components can be prevented.

[0146] Reference Figure 1 , Figure 2 and Figure 7 Terminal 60 is electrically connected to a second uncoated area 12 of electrode assembly 10. For example, terminal 60 may pass through approximately the center of a closed portion formed on the top of housing 20. Parts of terminal 60 may be exposed through the top of housing 20, while others may be disposed within housing 20. For example, terminal 60 may be secured to the inner surface of the closed portion of housing 20 by riveting.

[0147] As described above, in this disclosure, when the housing 20 is electrically connected to the first uncoated area 11 of the electrode assembly 10, the closed portion formed on the top of the housing 20 can serve as a first electrode terminal 20a having a first polarity. In contrast, when the terminal 60 is electrically connected to the second uncoated area 12 of the electrode assembly 10, the terminal 60 exposed to the outside of the housing 20 can serve as a second electrode terminal.

[0148] That is, the cylindrical battery 1 of this disclosure has a structure in which a pair of electrode terminals 60, 20a are arranged in the same direction. Therefore, when multiple cylindrical batteries 1 are electrically connected, electrical connection components such as busbars can be placed only on one side of the cylindrical battery 1. This can result in a simple battery pack structure and increased energy density. In addition, the cylindrical battery 1 has the following structure: one surface of the housing 20 having a generally flat shape can be used as the first electrode terminal 20a, thereby ensuring sufficient bonding strength between electrical connection components such as busbars and the bonding area of ​​the first electrode terminal 20a. Therefore, the cylindrical battery 1 can have sufficient bonding strength between the electrical connection components and the first electrode terminal 20a, and reduce the resistance at the bonding portion to a desired level.

[0149] As described above, when terminal 60 functions as the second electrode terminal, terminal 60 is electrically insulated 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 in a portion of terminal 60. Alternatively, terminal 60 and housing 20 can be separated from each other 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.

[0150] Furthermore, when the insulating washer G is used for electrical insulation and riveting is used to secure the terminal 60, the insulating washer G can deform together with the terminal 60 during riveting, causing the insulating washer G to bend towards the inner surface of the closed portion at the top of the housing 20. When the insulating washer G is made of resin material, the insulating washer G can be thermally fused to the housing 20 and the terminal 60. In this case, the sealability 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.

[0151] Reference Figure 2 and Figure 7 The second current collector 70 is connected to the upper portion of the electrode assembly 10. The second current collector 70 is made of a conductive metallic material and is connected to the second uncoated region 12. For example, the connection between the second uncoated region 12 and the second current collector 70 can be achieved by laser welding.

[0152] Reference Figure 2 and Figure 7 An insulating member 80 is inserted between the closed portion formed on the top of the housing 20 and the top of the electrode assembly 10, or between the closed portion and the second current collector 70. The insulating member 80 may be made of, for example, a resin material with insulating properties. The insulating member 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.

[0153] Furthermore, the insulating element 80 can be inserted 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.

[0154] The height of the insulating member 80 can correspond to the distance between the closed portion formed on the 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 portions used for electrical connections between components. When the insulating member 80 is used together with the separator 50, the movement prevention effect of the electrode assembly 10 can be maximized.

[0155] The insulating member 80 may have an opening formed at a position corresponding to the winding center hole C of the electrode assembly 10. Through this opening, the terminal 60 can directly contact the second current collector 70.

[0156] The cylindrical battery 1 disclosed herein has minimized resistance by utilizing the increased welding area through the curved surface, the diversified current path using the first current collector 30, and the minimized current path length. The AC resistance of the cylindrical battery 1, measured by a ohmmeter between the positive and negative terminals and between the terminal 60 and the surrounding flat surface 20a, can be approximately 0.5 milliohms to 4 milliohms, preferably approximately 1 milliohm to 4 milliohms, suitable for fast charging.

[0157] Preferably, the cylindrical battery can have a ratio of form factor greater than approximately 0.4 (a value obtained by dividing the diameter of the cylindrical battery by its height, i.e., defined as the diameter). (Ratio to height H).

[0158] Here, the shape factor refers to a value indicating the diameter and height of the cylindrical battery. Preferably, the diameter of the cylindrical battery can be approximately 40 mm to 50 mm, and the height can be approximately 60 mm to 130 mm. Cylindrical batteries according to embodiments of this disclosure can be, for example, 46110, 4875, 48110, 4880, and 4680 batteries. In the shape factor value, the first two digits indicate the diameter of the battery, while the remaining digits indicate the height of the battery.

[0159] When electrode assemblies with a jointless structure are applied to cylindrical cells with a form factor ratio greater than 0.4, the uncoated areas are prone to tearing due to the high stress applied in the radial direction when bending the uncoated areas. Furthermore, to ensure sufficient weld strength and reduce resistance when welding the current collector to the bent surface region of the uncoated area, it is necessary to significantly increase the number of uncoated areas stacked on the bent surface region. The electrodes and electrode assemblies according to embodiments (modified forms) of this disclosure can meet this requirement.

[0160] The battery according to an embodiment of the present disclosure may be a cylindrical battery having a generally cylindrical shape, a diameter of approximately 46 mm, a height of approximately 110 mm, and a shape factor ratio of approximately 0.418.

[0161] According to another embodiment, the battery can be a cylindrical battery having a generally cylindrical shape, a diameter of approximately 48 mm, a height of approximately 75 mm, and a shape factor ratio of approximately 0.640.

[0162] According to another embodiment, the battery can be a cylindrical battery having a generally cylindrical shape, a diameter of approximately 48 mm, a height of approximately 110 mm, and a shape factor ratio of approximately 0.418.

[0163] According to another embodiment, the battery can be a cylindrical battery having a generally cylindrical shape, a diameter of approximately 48 mm, a height of approximately 80 mm, and a shape factor ratio of approximately 0.600.

[0164] According to another embodiment, the battery can be a cylindrical battery having a generally cylindrical shape, a diameter of approximately 46 mm, a height of approximately 80 mm, and a shape factor ratio of approximately 0.575.

[0165] Traditionally, batteries with a form factor ratio of approximately 0.4 or less are used. That is, for example, 1865 and 2170 batteries are used. In the case of an 1865 battery, the diameter is approximately 18 mm and the height is approximately 65 mm, resulting in a form factor ratio of approximately 0.277. In the case of a 2170 battery, the diameter is approximately 21 mm and the height is approximately 70 mm, resulting in a form factor ratio of approximately 0.300.

[0166] Furthermore, the method of manufacturing battery 1 of the present disclosure as described above includes: inserting electrode assembly 10 into housing; placing current collector (first current collector) 30 on the bottom surface of electrode assembly 10; arranging separator 50 in contact with current collector 30; sealing housing 20 with the edge of separator 50; and attaching cover 40 to housing 20.

[0167] The manufacturing method may also include attaching the cover 40 to the edge of the separator 50, such that the separator 50 extends from the cover 40 to the collector 30. The edge of the sealing housing 20 of the separator 50 may extend in a circumferential direction.

[0168] refer to Figure 10 Multiple cylindrical cells 1 can be connected in series or parallel using the busbars 150 on the cylindrical cells 1. Considering the capacity of the battery pack, the number of cylindrical cells 1 can be fewer or more.

[0169] In each cylindrical battery 1, the terminal 60 may have a positive polarity, and the outer surface 20a of the closed portion of the casing 20 may have a negative polarity, and vice versa.

[0170] Preferably, the multiple cylindrical cells 1 can be arranged in multiple columns and rows. A column is relative to... Figure 10 The vertical direction, and the row is relative to Figure 10 The horizontal direction. Furthermore, to maximize space efficiency, the cylindrical cells 1 can be arranged in the most compact packaging structure. This most compact packaging structure is formed by connecting the centers of the terminals 60 exposed outside the housing 20 to each other in a right-angled triangle shape. Preferably, busbars 150 can be provided on multiple cylindrical cells 1, more preferably between adjacent columns. Alternatively, busbars 150 can be provided between adjacent rows.

[0171] Preferably, the busbar 150 connects the batteries 1 arranged in the same column in parallel and connects the cylindrical batteries 1 arranged in two adjacent columns in series.

[0172] 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.

[0173] The main body portion 151 may extend between the terminals 60 of adjacent cylindrical cells 1, and preferably between columns of cylindrical cells 1. Alternatively, the main body portion 151 may extend along the columns of cylindrical cells 1 and may be regularly curved in a zigzag pattern.

[0174] Multiple first busbar terminals 152 extend from one side of the main body 151 and protrude to the terminal 60 of each cylindrical battery 1, and are 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, ultrasonic welding, or the like. Additionally, multiple second busbar terminals 153 extend from the other side of the main body 151 and are electrically connected to the outer surface 20a of each cylindrical battery 1. The electrical connection between the second busbar terminals 153 and the outer surface 20a can be achieved by laser welding, ultrasonic welding, or the like.

[0175] Preferably, the main body portion 151, the plurality of first busbar terminals 152, and the plurality of second busbar terminals 153 may be made of a single conductive metal plate. The metal plate may include, for example, an aluminum plate or a copper plate, but this disclosure is not limited thereto. In a variant, the main body portion 151, the plurality of first busbar terminals 152, and the plurality of second busbar terminals 153 may be manufactured individually as single pieces and then joined together, for example, by welding.

[0176] Since the cylindrical battery 1 according to this disclosure is configured such that the outer surface 20a of the closed portion of the housing 20 with positive polarity and the terminal 60 with negative polarity are arranged in the same direction, the electrical connection of the cylindrical battery 1 can be easily established using the busbar 150.

[0177] In addition, since the outer surface 20a of the cylindrical battery 1, the terminal 60 and the closed portion of the housing 20 has a large area, the resistance of the battery pack including the cylindrical battery 1 can be sufficiently reduced due to the sufficient connection area of ​​the busbar.

[0178] Reference Figure 11 According to an embodiment of the present invention, the battery pack 3 includes a battery assembly and a battery pack housing 2 for housing the battery assembly. The battery assembly includes a plurality of cylindrical cells 1 electrically connected according to an embodiment of the present disclosure as described above. Reference has been made for illustrative purposes. Figure 10 The electrical connection structure of multiple batteries 1 using busbars is described, and for the sake of illustration in the accompanying drawings, the cooling unit and power terminals are omitted.

[0179] 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. According to embodiments of the present disclosure, the vehicle 5 operates using electricity supplied from the battery pack 3.

[0180] Although 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 changes can be made to this disclosure 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 and a second electrode and a diaphragm inserted between the first electrode and the second electrode, the first electrode, the second electrode and the diaphragm being wound around a winding axis to define a core and an outer peripheral surface, wherein the first electrode and the second electrode each include a first uncoated region and a second uncoated region along the winding direction, and no active material layer coating is present in the first uncoated region and the second uncoated region. A housing that accommodates the electrode assembly through an opening formed at the bottom; A first current collector is connected to the first uncoated area and disposed within the housing; A cover, the cover covering the opening; A separator, inserted between the cover and the electrode assembly, to secure the electrode assembly and seal the housing; and Terminals, which are electrically connected to the second uncoated area, The first collector is electrically connected to the housing between the separator and the housing.

2. The battery of claim 1, wherein, The separator includes: A movement prevention section is located between the first collector and the cover; A sealing portion, the sealing portion being located between the outer casing and the cover; and The connecting portion connects the movement prevention portion to the sealing portion.

3. The battery of claim 2, wherein, The height of the movement prevention section corresponds to the distance between the first collector and the cover.

4. The battery of claim 2, wherein, The movement prevention portion is located at the center of one surface of the electrode assembly.

5. The battery of claim 2, wherein, The movement prevention part includes a separator hole located at a position corresponding to the winding center hole of the electrode assembly.

6. The battery of claim 2, wherein, The sealing portion extends along the inner circumference of the housing.

7. The battery of claim 6, wherein, The outer casing includes: The rolled edge portion is formed by pressing the outer periphery; and Below the rolled edge portion, the end of the rolled edge portion that defines the opening extends and bends to surround the edge of the cover.

8. The battery of claim 7, wherein, The sealing portion bends along the curled portion and surrounds the edge of the cover.

9. The battery of claim 2, wherein, The connecting portion includes a plurality of extension legs that extend from the moving prevent portion in a radial or cross shape or a combination thereof.

10. The battery of claim 9, wherein, The plurality of extension legs are configured to avoid contact with the first collector.

11. The battery of claim 9, wherein, The plurality of extension legs are configured to maintain a distance from the cover.

12. The battery of claim 9, wherein, The first collector includes: A support portion, wherein the support portion is located at the center of the surface of the electrode assembly; An uncoated area connection portion, the uncoated area connection portion extending from the support portion and connecting to the first uncoated area; and The housing contact portion extends from the end of the support portion or the uncoated area connection portion and is inserted between the housing and the sealing portion.

13. The battery of claim 12, wherein, The support portion includes a first collector hole located at a position corresponding to the winding center hole of the electrode assembly.

14. The battery of claim 12, wherein, The outer casing includes: The rolled edge portion, wherein a portion of the sidewall of the rolled edge portion is pressed inward; and Below the rolled edge portion, the end of the rolled edge portion defining the opening extends and bends to surround the edge of the cover, and The outer shell contact portion contacts the surface of the rolled edge portion facing the cover.

15. The battery of claim 14, wherein, The sealing portion bends along the curled portion and fills the space between the outer casing contact portion and the cover while surrounding the edge of the cover.

16. The battery according to claim 15, wherein, The thickness of the sealing portion between the outer casing contact portion and the cover is smaller than the thickness between the rolled edge portion and the cover.

17. The battery according to claim 15, wherein, The compression ratio of the sealing portion between the outer shell contact portion and the cover is greater than the compression ratio of the sealing portion between the rolled edge portion and the cover.

18. The battery according to claim 15, wherein, The compression ratio of the sealing portion between the outer shell contact portion and the cover is equal to the compression ratio of the sealing portion between the rolled edge portion and the cover.

19. The battery according to claim 12, wherein, The movement prevention portion covers the support portion to prevent the support portion from being exposed to the outside of the movement prevention portion.

20. The battery according to claim 2, wherein, The cover includes a venting portion, the venting portion having a thickness smaller than that of its surrounding area, and The movement prevention part is located further inward than the exhaust part to prevent the movement prevention part from covering the exhaust part.

21. The battery according to claim 12, wherein, The connecting portion does not overlap with the contact portion of the outer casing along the height direction of the battery.

22. The battery according to claim 1, further comprising: A second collector is connected to the second uncoated area; as well as An insulating element is inserted between the closed portion at the top of the housing and the second current collector.

23. The battery of claim 22, wherein, The height of the insulating element corresponds to the distance between the second current collector and the enclosed portion.

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

25. The battery of claim 1, wherein, The ratio of the shape factor, calculated by dividing the diameter of the battery by its height, is greater than 0.

4.

26. A battery pack comprising: Multiple batteries according to any one of claims 1 to 25.

27. The battery pack according to claim 26, wherein, The plurality of batteries are arranged in a predetermined number of columns, and The outer surface of the enclosed portion of the casing of each battery and the terminals are arranged facing upwards.

28. The battery pack according to claim 26, wherein, The battery pack includes multiple busbars to connect the multiple batteries in series and parallel. The plurality of busbars are arranged on 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 in one direction of the main body and electrically connected to terminals of the battery disposed in that direction; and A plurality of second busbar terminals extend in the opposite direction of the main body portion and are electrically connected to the outer surface of a closed portion of a battery housing disposed in the opposite direction.

29. A vehicle comprising the battery pack according to claim 26.

30. A battery comprising: An electrode assembly, the electrode assembly including a first uncoated region and a second uncoated region; A housing that accommodates the electrode assembly through an opening formed at the bottom; A first current collector is connected to the first uncoated area in the housing; as well as The separator includes a central portion supporting the bottom of the first collector and a peripheral portion contacting the housing. The first collector is electrically connected to the housing between the separator and the housing.

31. The battery according to claim 30, further comprising: Terminals that are electrically connected to the second uncoated area.

32. The battery according to claim 30, wherein, The upper surface of the central portion is positioned at a higher position than the upper surface of the peripheral portion.

33. The battery according to claim 30, wherein, The central portion includes a separator hole located at a position corresponding to the winding center hole of the electrode assembly.

34. The battery according to claim 30, wherein, The peripheral portion extends to the inner surface of the housing.

35. The battery according to claim 34, wherein, The separator also includes a flange extending downward from the outer edge of the peripheral portion.

36. The battery according to claim 30, further comprising: A cover that covers the opening at the lower end of the outer casing. The upper surface of the central portion contacts the lower surface of the first collector, and the lower surface of the central portion contacts the inner surface of the cover.

37. A method for manufacturing a battery, the method comprising the following steps: Insert the electrode assembly into the housing; Place the current collector on the bottom surface of the electrode assembly; The separator is arranged to contact the collector; The housing is sealed with the edge of the separator; as well as Attach the cover to the outer casing. The current collector is electrically connected to the housing between the separator and the housing.

38. The method of manufacturing a battery according to claim 37, further comprising the following steps: The cover is attached to the edge of the separator such that the separator extends from the cover to the collector.

39. The method of manufacturing a battery according to claim 37, wherein, The edge of the sealing housing of the separator extends circumferentially.

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