Battery, battery pack including the same, and vehicle

Abstract

A battery, a battery pack including the same, and a vehicle. Disclosed is a battery including: an electrode assembly having a first uncoated portion and a second uncoated portion; a case having an opening portion formed at one side and configured to accommodate the electrode assembly through the opening portion; a first current collector coupled with the first uncoated portion and located within the case; a cover configured to cover the opening portion; and a spacer assembly having: a spacer portion interposed between the first current collector and the cover and configured to prevent movement of the electrode assembly; a gasket portion interposed between the case and the cover and configured to seal a gap between the cover and the case; and a connection portion configured to connect the spacer portion and the gasket portion and to cause the spacer portion to rotate when a force exceeding a standard value is applied in a direction from the gasket portion toward the spacer portion.

Description

TECHNICAL FIELD

[0001] This application claims priority to Korean Patent Application No. 10-2022-0014957, filed on February 4, 2022, and Korean Patent Application No. 10-2022-0088960, filed on July 19, 2022, the disclosures of which are incorporated herein by reference.

[0002] The present disclosure relates to a battery and a battery pack and a vehicle including the same. More particularly, the present disclosure relates to a battery having a structure capable of minimizing movement of an internal electrode assembly, and a battery pack and a vehicle including the same. BACKGROUND

[0003] In a battery, a jelly-roll having a shape in which a positive tab and a negative tab extend upward and downward in a height direction can be applied to a case to maximize current collection efficiency. In a battery applying a jelly-roll having the above structure, a current collector can serve as a medium to connect the positive tab and the negative tab to a terminal and a case, respectively.

[0004] In this case, for example, a positive current collector can be connected to the positive tab while covering one surface of the jelly-roll, and a negative current collector can be connected to the negative tab while covering the other surface of the jelly-roll. In addition, the positive current collector can be electrically connected to the terminal, and the negative current collector can be electrically connected to the case.

[0005] In a battery having the above structure, a relatively large empty space can be formed between the negative current collector and the cover. In addition, an empty space can also be formed between the bottom surface of the case positioned opposite the cover and the positive current collector.

[0006] These empty spaces can cause the jelly-roll to move within the case, particularly in the up-and-down direction, i.e., along the height direction of the battery. When the jelly-roll moves up and down like this, the bonding between the current collector and the electrode tab can be damaged, in addition, the bonding between the current collector and the case and the bonding between the current collector and the terminal can be damaged.

[0007] Therefore, it is necessary to minimize the movement space of the jelly-roll as much as possible. In addition, if additional components suitable for reducing the movement space of the jelly-roll are used, the complexity of the process and the manufacturing cost can increase, and thus it is necessary to solve these problems by using components that have been applied in the past. SUMMARY

[0008] TECHNICAL PROBLEM

[0009] The present disclosure is designed to solve the problems of the related art, and thus the present disclosure aims to prevent damage to the electrical coupling portion caused by movement of the jelly-roll within the case.

[0010] Further, the disclosure aims to prevent the increase in complexity of the manufacturing process and manufacturing costs due to the application of additional components by preventing the movement of the jelly roll using components that have been applied in the past when manufacturing the battery.

[0011] In another aspect, the disclosure also relates to preventing abnormal deformation of a spacer assembly due to a force applied to the spacer assembly during the manufacturing process of a battery.

[0012] The technical objects to be solved by the disclosure are not limited to the above and other objects not mentioned herein will be clearly understood by those skilled in the art from the following disclosure.

[0013] Technical solutions

[0014] In one aspect of the disclosure, a battery includes an electrode assembly having a first uncoated portion and a second uncoated portion, a case having an open portion formed at one side and configured to accommodate the electrode assembly through the open portion, a first current collector coupled with the first uncoated portion and located inside the case, a cover configured to cover the open portion, and a spacer assembly having a spacer portion interposed between the first current collector and the cover and configured to prevent movement of the electrode assembly, a gasket portion interposed between the case and the cover and configured to seal a gap between the cover and the case, and a connection portion configured to connect the spacer portion and the gasket portion and to rotate the spacer portion when a force exceeding a standard value is applied in a direction from the gasket portion toward the spacer portion.

[0015] The connection portion can include a plurality of bridges arranged to be spaced apart from each other in a circumferential direction of the electrode assembly.

[0016] Each of the plurality of bridges can include a first portion connected to the spacer portion and a second portion connected to the gasket portion.

[0017] The first portions of the plurality of bridges can be inclined to form a predetermined angle with a radial direction of the electrode assembly and connected to the spacer portion, respectively.

[0018] The first portions of the plurality of bridges can be inclined in the same direction.

[0019] The first portion and the second portion can be connected to each other while forming a predetermined angle.

[0020] The spacer portion can have a height corresponding to a distance between the first current collector and the cover.

[0021] The spacer portion can be located at a center of one surface of the electrode assembly.

[0022] The spacer portion can have a spacer hole formed at a position corresponding to a winding center hole of the electrode assembly.

[0023] The spacer assembly can have a pop-out preventing portion configured to intersect the spacer hole.

[0024] The housing can include a press edge portion formed by press-fitting an outer circumference, and a roll edge portion configured to extend and be bent such that end portions of the roll edge portion define the opening portion around an edge of the cover under the press edge portion.

[0025] The gasket portion can be bent along the roll edge portion to surround the edge of the cover.

[0026] The plurality of bridges can be configured not to contact the first current collector.

[0027] The plurality of bridges can be configured not to contact the cover.

[0028] The first current collector can include a support portion located at a center on one surface of the electrode assembly, an uncoated portion coupling portion configured to extend from the support portion and coupled to the first uncoated portion, and a housing contact portion configured to extend from the support portion or from an end portion of the uncoated portion coupling portion and interposed between the housing and the gasket portion.

[0029] The housing can include a press edge portion formed by press-fitting a portion of a sidewall of the press edge portion inwardly, and a roll edge portion configured to extend and be bent such that end portions of the roll edge portion define the opening portion around an edge of the cover under the press edge portion.

[0030] The housing contact portion can be in contact with one surface of the press edge portion facing the cover.

[0031] The cover can include a vent portion having a thickness thinner than that of a surrounding area.

[0032] The spacer portion can be located more inwardly than a vent portion, not covering the vent portion.

[0033] The connection portion can be disposed not to overlap the housing contact portion in the height direction of the battery.

[0034] In another aspect of the present disclosure, a battery pack including the battery of an embodiment of the present disclosure is also provided.

[0035] In another aspect of the present disclosure, a vehicle including the battery pack of an embodiment of the present disclosure is also provided.

[0036] Advantageous Effects

[0037] According to an embodiment of the present disclosure, movement of the jelly roll within the housing is minimized, thereby preventing damage to the electrical coupling portion.

[0038] According to another embodiment of the present disclosure, by utilizing components that have already been applied in the past rather than additionally applying components for preventing movement of the jelly roll, it is possible to prevent an increase in complexity of the manufacturing process and manufacturing costs.

[0039] According to still another embodiment of the present disclosure, it is possible to prevent abnormal deformation of the spacer assembly due to a force applied to the spacer assembly during a manufacturing process of the battery. Further, since the abnormal deformation of the spacer assembly is prevented, it is possible to effectively prevent occurrence of product defects due to a force applied to the current collector and / or the electrode assembly due to deformation of the spacer assembly. BRIEF DESCRIPTION OF DRAWINGS

[0040] The accompanying drawings illustrate preferred embodiments of the present disclosure and, together with the foregoing disclosure, provide further understanding of the technical features of the present disclosure, and therefore, the present disclosure is not construed as being limited to the drawings.

[0041] Figure 1 FIG. 1 is a perspective view illustrating an external appearance of a cylindrical battery according to an embodiment of the present disclosure.

[0042] Figure 2 FIG. 2 is a cross-sectional view illustrating an internal structure of the cylindrical battery according to an embodiment of the present disclosure.

[0043] Figure 3 FIG. 3 is a perspective view illustrating a schematic form of a first current collector applied to the present disclosure.

[0044] Figure 4 FIG. 4 is a partial cross-sectional view illustrating a region to which a spacer assembly of the present disclosure is applied.

[0045] Figure 5 and Figure 6 FIG. 5 is a view illustrating a schematic form of the spacer assembly according to the present disclosure.

[0046] Figure 7is a diagram of an internal structure of a cylindrical battery to which a separator assembly according to the present disclosure is applied, which illustrates that abnormal deformation does not occur in the separator assembly even if a force is applied to the separator assembly according to a press bonding process, and thus abnormal deformation does not occur in the current collector.

[0047] Figure 8 is a diagram illustrating a separator assembly having no stress relief structure, which is different from the separator assembly of the present disclosure.

[0048] Figure 9 is a diagram of an internal structure of a cylindrical battery to which a separator assembly having no stress relief structure is applied, which illustrates that abnormal deformation occurs in the separator assembly due to a force transmitted according to a press bonding process, as a result, abnormal deformation also occurs in the current collector.

[0049] Figure 10 is a plan view illustrating a bottom surface of a cylindrical battery of the present disclosure.

[0050] Figure 11 is a partial cross-sectional view illustrating a region to which an insulator of the present disclosure is applied.

[0051] Figure 12 is a diagram illustrating an electrode assembly formed with a section of the present disclosure.

[0052] Figure 13 is a top plan view illustrating a state in which a plurality of cylindrical batteries according to an embodiment of the present disclosure are connected in series and in parallel using bus bars.

[0053] Figure 14 is a schematic view illustrating a battery pack according to an embodiment of the present disclosure.

[0054] Figure 15 is a conceptual view illustrating a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it is to be understood that the terminology used in the specification and the appended claims should not be interpreted as limiting in general meaning and dictionary meaning, but should be interpreted based on the principle that the inventors properly define the terminology for the best explanation, based on the meaning and concept corresponding to the technical aspects of the present disclosure. Therefore, the description presented herein is merely a preferred example for illustrative purposes, and is not intended to limit the scope of the present disclosure, and it should be understood that other equivalents and modifications can be made thereto without departing from the scope of the present disclosure.

[0056] Further, the drawings are not drawn to scale and the sizes of some components can be exaggerated in order to help understanding of the present disclosure. Also, the same reference numerals can be assigned to the same elements in different embodiments.

[0057] When it is explained that two objects are "the same", it means that the objects are "substantially the same". Thus, substantially the same objects can include deviations considered to be low in the art, for example, within 5%. Also, when it is explained that certain parameters are uniform in a region, it can mean that the parameters are uniform on average.

[0058] Although the terms first, second, etc. are used to describe different elements, the elements are not limited by these terms. The terms are used to distinguish one element from another, and the first element can be the second element unless there is a contrary indication.

[0059] Throughout the specification, unless otherwise specified, each element can be singular or plural.

[0060] When one element is "above (or below) another element" or "on (or under) another element", the one element can be on the upper surface (or lower surface) of the other element, and intermediate elements can exist between the one element and the other element on (or under).

[0061] Also, when one element is referred to as being "connected", "coupled", or "linked" to another element, one element can be directly connected or coupled to the other element, but it should be understood that intermediate elements can exist between each element, or each element can be "connected", "coupled", or "linked" to each other through another element.

[0062] Throughout the specification, unless otherwise explicitly stated, "A and / or B" means A or B or both A and B, and unless otherwise explicitly stated, "C to D" means C or greater and D or less.

[0063] Referring to Figure 1 and Figure 2 The battery 1 according to the embodiment of the disclosure can be, for example, a cylindrical battery. The cylindrical battery 1 includes an electrode assembly 10, a case 20, a first current collector 30, a cap 40, and a spacer assembly 50. The cylindrical battery 1 can further include a terminal 60. In addition to the above-described components, the cylindrical battery 1 can further include an insulating gasket G and / or a second current collector 70 and / or an insulator 80. The disclosure does not limit the shape of the battery, and can be applied to other shapes of batteries, such as a prismatic battery.

[0064] Referring to Figure 2 , Figure 4 , Figure 11 and Figure 12The electrode assembly 10 includes a first uncoated portion 11 and a second uncoated portion 12. The electrode assembly 10 includes a first electrode having a first polarity, a second electrode having a second polarity, and a separator interposed between the first electrode and the second electrode. The first electrode is a negative electrode or a positive electrode, and the second electrode corresponds to an electrode having a polarity opposite to that of the first electrode.

[0065] The electrode assembly 10 can have, for example, a jelly-roll shape. That is, the electrode assembly 10 can be manufactured by winding a laminate formed by sequentially laminating the first electrode, the separator, and the second electrode at least once. The jelly-roll type electrode assembly 10 can have a winding center hole C formed at the center thereof and extending in the height direction (a direction parallel to the Z-axis). In addition, an additional separator can be provided on the outer circumference of the electrode assembly 10 for insulation from the case 20.

[0066] The first electrode includes a first conductive substrate and a first electrode active material layer coated on one surface or both surfaces of the first conductive substrate. On one end in the width direction (a direction parallel to the Z-axis) of the first conductive substrate, a first uncoated portion uncoated with the first electrode active material is provided. When the first electrode is in an unfolded state, the first uncoated portion has a shape extending from one end to the other end in the longitudinal direction of the first electrode. The first uncoated portion 11 can function as a first electrode tab. The first uncoated portion 11 is disposed on one surface of the electrode assembly 10. More specifically, the first uncoated portion 11 is disposed on the lower portion of the electrode assembly 10 accommodated in the case 20 in the height direction (a direction parallel to the Z-axis).

[0067] The second electrode includes a second conductive substrate and a second electrode active material layer coated on one surface or both surfaces of the second conductive substrate. On the other end in the width direction (a direction parallel to the Z-axis) of the second conductive substrate, an uncoated portion uncoated with the second electrode active material is provided. When the second electrode is in an unfolded state, the second uncoated portion has a shape extending from one end to the other end in the longitudinal direction of the second electrode. The second uncoated portion 12 can function as a second electrode tab. The second uncoated portion 12 is disposed on the other surface of the electrode assembly 10. More specifically, the second uncoated portion 12 is disposed on the upper portion of the electrode assembly 10 accommodated in the case 20 in the height direction (a direction parallel to the Z-axis).

[0068] That is, the first uncoated portion 11 and the second uncoated portion 12 protrusively extend in the height direction (a direction parallel to the Z-axis) of the electrode assembly 10 (i.e., in the opposite direction along the height direction of the cylindrical battery 1), and are exposed to the outside of the separator.

[0069] In addition, with reference to Figure 12At least a portion of the first uncoated portion 11 and / or the second uncoated portion 12 can include a plurality of segments F divided along a winding direction of the electrode assembly 10. In this case, the plurality of segments can be curved in a radial direction of the electrode assembly 10. The plurality of curved segments can be overlapped in a plurality of layers. In this case, the first current collector 30 and / or the second current collector 70 (to be described later) can be coupled to the plurality of segments F in a region in which a plurality of layers are overlapped. Further, the electrode assembly 10 can include a welding target region which is a region in which the number of overlapped layers of the segments F of the first uncoated portion 11 is kept constant along the radial direction of the electrode assembly 10. In this region, since the number of overlapped layers is kept substantially at a maximum value, it can be advantageous to perform welding of the first current collector 30 and the first uncoated portion 11 and / or welding of the second current collector 70 and the second uncoated portion 12 (to be described later) in this region. For example, in the case of applying laser welding, this is to prevent a laser beam from penetrating the first uncoated portion 11 and / or the second uncoated portion 12 and damaging the electrode assembly 10 when increasing laser power to improve welding quality. Further, this is to effectively prevent impurities such as welding spatter from being introduced into the electrode assembly 10.

[0070] In the present disclosure, the positive active material coated on the positive current collector and the negative active material coated on the negative current collector can employ any active material known in the art without limitation.

[0071] In one example, the positive active material can include an alkali metal compound represented by a general formula A[A x M y ]O 2+z (A includes at least one element among Li, Na, and K; M includes at least one element selected from Ni, Co, Mn, Ca, Mg, Al, Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; and x ≥ 0, 1 ≤ x + y ≤ 2, -0.1 ≤ z ≤ 2; and the stoichiometric coefficients of x, y, and z and the components included in M are selected so that the compound remains electrically neutral).

[0072] In another example, the positive active material can be an alkali metal compound xLiM1O2-(1-x)Li2M2O3 disclosed in US 6,677,082, US 6,680,143, etc., wherein M 1 includes at least one element having an average oxidation state of 3; M 2 includes at least one element having an average oxidation state of 4; and 0 ≤ x ≤ 1.

[0073] In yet another example, the positive active material can be a lithium transition metal oxide represented by a general formula Li a M 1 xFe 1-x M 2 y P 1-y M 3 z O 4-z Lithium metal phosphate (M 1 comprises at least one element selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, MG, and Al; M 2 contains at least one element selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, As, Sb, Si, Ge, V, and S; M 3 includes halogen elements, which optionally include F; 0 < a ≤ 2, 0 ≤ x ≤ 1, 0 ≤ y < 1, 0 ≤ z < 1; selection includes components in M 1 , M 2 and M 3 and the stoichiometric coefficients of a, x, y, and z to keep the compound electrically neutral), or Li3M2(PO4)3 (M comprises at least one element selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, MG, and Al).

[0074] Preferably, the positive electrode active material may include primary particles and / or secondary particles aggregating the primary particles.

[0075] In one example, the negative electrode active material can use carbon materials, lithium metal or lithium metal compounds, silicon or silicon compounds, tin or tin compounds, etc., Metal oxides with a potential less than 2V (such as TiO2 and SnO2) can also be used as the negative electrode active material. As the carbon material, low-crystalline carbon, high-crystalline carbon, etc. can be used.

[0076] The separator can use a porous polymer membrane, for example, a porous polymer membrane made of polyolefin polymers (such as ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer, ethylene / methacrylate copolymer, etc.) or their laminates. As another example, the separator can use ordinary porous non-woven fabrics, for example, non-woven fabrics made of high-melting-point glass fibers, polyethylene terephthalate fibers, etc.

[0077] At least one surface of the separator may include a coating of inorganic particles. The separator itself can also be made of a coating of inorganic particles. The particles constituting the coating can have a structure combined with an adhesive, such that there is an interstitial volume between adjacent particles.<​​​​​​1-y Ti y O3(PLZT), PB(Mg3Nb 2 / 3 )O3, PbTiO3(PMN-PT), BaTiO3, hafnium dioxide (HfO2), SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO, and Y2O3.

[0079] The electrolyte can be a salt having a structure of A + B - Here, A + includes an alkali metal cation (e.g., Li + , Na + , or K + ) or a combination thereof, and B - includes an 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 - At least one anion in the group.

[0080] The electrolyte can also be dissolved in organic solvents. Suitable organic solvents 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), γ-butyrolactone, or mixtures thereof.

[0081] Reference Figure 1 , Figure 2 , Figure 4 and Figure 11 The housing 20 houses the electrode assembly 10 through an opening formed at its bottom. The housing 20 is a generally cylindrical container with an opening at its bottom and a closed portion at its top. The housing 20 can be made of a conductive material (e.g., metal). For example, the material of the housing 20 can be aluminum. The side surfaces (outer periphery) 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 electrode assembly 10 together with the electrolyte through the opening formed at its bottom.

[0082] The housing 20 is electrically connected to the electrode assembly 10. The housing 20 is connected to the first uncoated portion 11 of the electrode assembly 10. Therefore, the housing 20 has the same polarity as the first uncoated portion 11.

[0083] Reference Figure 2 and Figure 4 The housing 20 may include a crimping portion 22 and a beading portion 21 formed at its bottom end. The beading portion 21 is disposed on the underside of the electrode assembly 10 housed within the housing 20. The beading portion 21 is formed by pressing the outer periphery of the housing 20. By partially reducing the inner diameter of the housing 20, the beading portion 21 prevents the electrode assembly 10 (whose dimensions substantially correspond to the width of the housing 20) from protruding through the opening formed at the bottom end of the housing 20. The beading portion 21 may also serve as a support portion on which the cover 40 is disposed.

[0084] The rolled edge portion 22 is formed below the pressing edge portion 21. The rolled edge portion 22 has an extended and curved shape such that the end of the portion defining the opening of the housing 20 surrounds the periphery of the edge of the cover 40 while the periphery of the edge of the spacer assembly 50 is inserted therebetween.

[0085] ReferenceFigures 2 to 4 The first current collector 30 is coupled to the first uncoated portion 11 of the electrode assembly 10 and is positioned inside the case 20. The first current collector 30 covers at least a portion of one surface of the bottom end of the electrode assembly 10. The coupling body including the electrode assembly 10 and the first current collector 30 can be inserted into the case 20 through the open portion formed at the bottom end of the case 20. The first current collector 30 is electrically connected to the case 20. That is, the first current collector 30 can serve as a medium for electrical connection between the electrode assembly 10 and the case 20.

[0086] Referring to Figure 3 The first current collector 30, for example, can include a support portion 31, an uncoated portion coupling portion 32, and a case contact portion 33. The support portion 31 is positioned substantially at the center of one surface of the bottom end of the electrode assembly 10. A first current collector hole H1 can be provided in the support portion 31. In this case, the first current collector hole H1 can be formed at a position corresponding to the winding center hole C of the electrode assembly 10. The first current collector hole H1 can serve as a passage for laser irradiation or for insertion of a welding rod to make a junction between the terminal 60 and the second current collector 70, which will be explained later. In addition, the first current collector hole H1 can also serve as a passage through which an electrolyte solution can smoothly impregnate the electrode assembly 10 when the electrolyte solution is injected.

[0087] The uncoated portion coupling portion 32 extends from the support portion 31 and is coupled to the first uncoated portion 11. The uncoated portion coupling portion 32, for example, can be provided in a plurality. In this case, the plurality of uncoated portion coupling portions 32 can have a shape extending radially from the support portion 31. The case contact portion 33 can extend from the support portion 31 as shown in Figure 3 , or can extend differently from the end of the uncoated portion coupling portion 32 as shown in Figure 3 . One end of the case contact portion 33 can be interposed between the case 20 and the gasket portion 52 of the separator assembly 50 (to be explained later) and contact the case 20, whereby the case 20 and the first current collector 30 can be electrically connected. For example, the end of the case contact portion 33 can contact one surface of the press rim portion 21 facing the cover 40.

[0088] For example, the case contact portion 33 can be provided in a plurality. In this case, as shown in Figure 3 , the plurality of case contact portions 33 can have a shape extending radially from the support portion 31, and at least one case contact portion 33 can be positioned between the uncoated portion coupling portions 32 adjacent to each other. Or, differently from Figure 3 , the plurality of case contact portions 33 can have a shape extending respectively from the ends of the plurality of uncoated portion coupling portions 32.

[0089] Referring to Figure 2 ,Figure 4 and Figure 10 The cover 40 covers an open portion formed in the case 20. The cover 40 can be made of, for example, a metallic material to ensure rigidity. The cover 40 forms a lower surface of the cylindrical battery 1. In the cylindrical battery 1 of the present disclosure, the cover 40 can not have polarity even when made of a metallic material having electrical conductivity. Having no polarity means that the cover 40 is electrically insulated from the case 20 and the terminal 60. Accordingly, the cover 40 does not serve as a positive terminal or a negative terminal. Therefore, the cover 40 does not need to be electrically connected to the electrode assembly 10 and the case 20, and its material does not necessarily have to be an electrically conductive metal.

[0090] When the case 20 of the present disclosure includes the crimped portion 21, the cover 40 can be seated on the crimped portion 21 formed in the case 20. Also, when the case 20 of the present disclosure includes the curled portion 22, the cover 40 is fixed by the curled portion 22. Between the curled portion 22 of the case 20 and the cover 40, the periphery of the edge of the spacer assembly 50 is inserted to ensure the airtightness of the case 20.

[0091] Referring to Figure 4 and Figure 10 The cover 40 can further include a vent portion 41 to prevent the internal pressure from increasing beyond a preset value due to gas generated inside the case 20. The vent portion 41 corresponds to an area of the cover 40 having a thickness smaller than that of a surrounding area. The vent portion 41 is structurally weaker than the surrounding area. Accordingly, when an abnormality occurs in the cylindrical battery 1 such that the internal pressure of the case 20 increases to a certain level or more, the vent portion 41 can be ruptured to discharge gas generated inside the case 20. The vent portion 41 can be formed by partially reducing the thickness of the case 20, for example, by slitting either one surface or both surfaces of the cover 40.

[0092] As shown in Figure 4 , the bottom end of the cover 40 is preferably higher than the bottom end of the case 20. In this case, even if the bottom end of the case 20 contacts the bottom surface of a case of a module or a battery pack structure, the cover 40 does not contact the bottom surface of the case. Accordingly, a phenomenon in which the pressure required to rupture the vent portion 41 differs from a design value due to the weight of the cylindrical battery 1 can be prevented, and thus the smooth rupture of the vent portion 41 can be ensured.

[0093] Also, when the vent portion 41 has a shape as shown in Figure 4 and Figure 10When the closed loop shape is shown, the longer the distance from the center of the cover 40 to the exhaust portion 41 is, the more advantageous it is in terms of ease of breakage. This is because, when the same exhaust pressure is applied, the force acting on the exhaust portion 41 increases to facilitate breakage as the distance from the center of the cover 40 to the exhaust portion 41 increases. Also, the longer the distance from the center of the cover 40 to the exhaust portion 41 is, the more advantageous it is in terms of smoothness of gas discharge. From this perspective, it is advantageous for the exhaust portion 41 to be formed along the peripheral edge of the substantially flat area that protrudes downward (in a direction based on the Figure 4 the peripheral edge of the substantially flat area that protrudes downward (in a direction based on the

[0094] The present disclosure Figure 10 The case where the exhaust portion 41 is continuously formed while being drawn approximately circular is shown, but the present disclosure is not limited thereto. The exhaust portion 41 can be discontinuously formed on the cover 40 while being formed in a substantially circular shape, or can be formed in a substantially linear shape or other shapes.

[0095] Referring to Figure 2 and Figures 4 to 6 The spacer assembly 50 is configured to prevent movement of the electrode assembly 10 and to enhance the sealing force of the case 20. That is, the spacer assembly 50 is disposed between the cover 40 and the electrode assembly 10 to fix the electrode assembly 10 and seal the case 20. The spacer assembly 50 can include a central portion to support the bottom of the first current collector 30 and a peripheral portion to contact the case 20. In this case, the upper surface of the central portion can be higher than the upper surface of the peripheral portion. The upper surface of the central portion can contact the lower surface of the first current collector 30, and the lower surface of the central portion can contact the inner surface of the cover 40. The central portion can have a spacer hole H2 formed at a position corresponding to the winding center hole C of the electrode assembly 10. The peripheral portion can extend toward the inner surface of the case 20. The spacer assembly 50 can further include a flange extending downward from the outer edge of the peripheral portion. In this case, when the case 20 is crimped, the flange can be bent together with the case 20 to cover the edge of the cover 40.

[0096] In another aspect, the spacer assembly 50 can include, for example, a spacer portion 51, a gasket portion 52, and a connection portion 53. In addition to the above-described components, the spacer assembly 50 can further include a bullet-proofing portion 54. The spacer portion 51 can be interposed between the first current collector 30 and the cover 40 to prevent movement of the electrode assembly 10. The spacer portion 51 can have a height corresponding to the distance between the first current collector 30 and the cover 40. In this case, the spacer portion 51 can effectively prevent the electrode assembly 10 from moving within the case 20 due to a gap formed between the first current collector 30 and the cover 40. Accordingly, the spacer portion 51 can prevent damage to the coupling portion between the electrode assembly 10 and the first current collector 30 and / or the coupling portion between the first current collector 30 and the case 20.

[0097] The spacer portion 51 can be located substantially at the center of one surface of the bottom end of the electrode assembly 10. The spacer portion 51 can include a spacer hole H2 formed at a position corresponding to the winding center hole C of the electrode assembly 10. Like the first current collector hole H1 described above, the spacer hole H2 can serve as a passage for insertion of an electrode rod or a passage for laser irradiation. Like the first current collector hole H1 described above, the spacer hole H2 can serve as a passage through which electrolyte can smoothly impregnate the electrode assembly 10 when the electrolyte is injected.

[0098] In addition, the spacer portion 51 can cover the support portion 31 of the first current collector 30 such that the support portion 31 is not exposed to the outside of the spacer portion 51. That is, the outer diameter of the top end of the spacer portion 51 can be substantially equal to or greater than the outer diameter of the support portion 31. In this case, the spacer portion 51 can effectively press the first current collector 30.

[0099] On the other hand, the spacer portion 51 can be configured to cover at least a portion of a welded portion formed by welding the coupling portion 32 of the first current collector 30 and the first uncoated portion 11. That is, the radius of the top end of the spacer portion 51 can 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 this case, the spacer portion 51 can effectively prevent a phenomenon in which the welded portion of the first current collector 30 and the first uncoated portion 11 is damaged, for example, in a press process or a sizing process.

[0100] On the other hand, the spacer portion 51 can be positioned more inward toward the core than the exhaust portion 41 so as not to cover the exhaust portion 41 formed in the cover 40. That is, the radius measured at the top end of the spacer portion 51 can be less than the distance from the center of the cover 40 to the exhaust portion 41. This is to prevent the burst pressure of the exhaust portion 41 from being different from the design value because the exhaust portion 41 is covered by the spacer assembly 50.

[0101] The gasket portion 52 is interposed between the case 20 and the cover 40. The gasket portion 52 can have a shape extending along the inner periphery of the case 20. When the case 20 includes the curled portion 22, the gasket portion 52 can be bent along the curved shape of the curled portion 22 to cover the peripheral area of the edge of the cover 40. On the other hand, the gasket portion 52 can be bent along the curled portion 22 to fill the gap between the case contact portion 33 and the cover 40 while covering the edge of the cover 40. As such, the gasket portion 52 can improve the fixing force of the cover 40 and the sealing force of the case 20.

[0102] Further, in the gasket portion 52, the thickness between the case contact portion 33 and the cover 40 can be smaller than the thickness between the crimp portion 21 and the cover 40. This is because the gasket portion 52 can be compressed more in the region in which the case contact portion 33 is interposed between the case 20 and the crimp portion 21 than in other regions. Accordingly, in the gasket portion 52, the compression rate between the case contact portion 33 and the cover 40 can be greater than the compression rate between the crimp portion 21 and the cover 40. Alternatively, the gasket portion 52 can be configured such that the compression rate between the case contact portion 33 and the cover 40 is substantially the same as the compression rate between the crimp portion 21 and the cover 40. In this case, since the compression rate of the gasket portion 52 differs for each region, it is possible to prevent the phenomenon in which the sealing force is locally reduced.

[0103] The connection portion 53 connects the spacer portion 51 and the gasket portion 52 to each other. The connection portion 53 can be configured to rotate the spacer portion 51 when a force exceeding a standard value is applied in a direction from the gasket portion 52 toward the spacer portion 51. Here, the rotation of the spacer portion 51 means rotation clockwise or counterclockwise in a direction of the circumference of the electrode assembly 10. Specifically, for example, when a force is applied in a direction from the outside of the cylindrical battery 1 toward the center in a case in which a crimping process is performed when manufacturing the cylindrical battery 1, the connection portion 53 can be configured to apply a force in a direction in which the spacer portion 51 is rotated.

[0104] Accordingly, in the cylindrical battery 1 according to the disclosure, even if an external force is applied, the spacer assembly 50 can effectively disperse the force without causing abnormal deformation.

[0105] The connection portion 53 can include, for example, a plurality of bridges 53a spaced apart from each other in a direction of the circumference of the electrode assembly 10. In this case, spaces formed between the bridges 53a adjacent to each other can serve as passages for smoothly circulating the electrolyte. On the other hand, the spaces formed between the bridges 53a adjacent to each other can serve as passages for smoothly discharging internal gas when discharge occurs due to an increase in internal pressure.

[0106] In addition, each of the plurality of bridges 53a can include a first portion connected to the spacer portion 51 and a second portion connected to the pad portion 52. The first portions of the plurality of bridges 53a can be inclined to form a predetermined angle with the radial direction of the electrode assembly 10 and are connected to the spacer portion 51, respectively. If the force transmitted through the bridges 53a is transmitted along the radial direction of the electrode assembly 10 substantially perpendicularly to the outer circumference of the spacer portion 51, there is a high risk of deformation of the bridges 53a, and the possibility of the spacer portion 51 deviating from the mounting position can increase. Therefore, by forming a predetermined angle at the connecting portion between the bridges 53a and the spacer portion 51, the force applied from the outside of the battery 1 toward the center acts in a direction to rotate the spacer portion 51, thereby minimizing or preventing deformation of the bridges 53a.

[0107] In addition, when the connecting portion 53 includes the plurality of bridges 53a, the first portions of the plurality of bridges 53a can be inclined in the same direction on the plane (X-Y plane), respectively. For example, the plurality of bridges 53a can be formed substantially spirally in a clockwise or counterclockwise direction. According to this structure of the present disclosure, when the force acting on the plurality of bridges 53a by the external force acts on the spacer portion 51 equally in any one of the clockwise and counterclockwise directions, the spacer portion 51 can rotate smoothly.

[0108] The anti-ejection portion 54 can be configured to intersect the spacer hole H2. The anti-ejection portion 54 can be configured to reduce the opening area of the spacer hole H2. For example, the anti-ejection portion 54 can have a substantially cross shape. However, this is only a schematic form of the anti-ejection portion 54, and the shape of the anti-ejection portion 54 is not limited thereto.

[0109] The anti-ejection portion 54 can be provided at a position corresponding to the wound center hole of the electrode assembly 10 and the first current collector hole H1 of the first current collector 30. When venting occurs due to an increase in pressure inside the case 20, the anti-ejection portion 54 can prevent the wound center of the electrode assembly 10 from being ejected to the outside of the case 20.

[0110] Referring to Figure 6 The first and second portions of the bridge 53a can be connected to each other while forming a predetermined angle. That is, the bridge 53a can have a shape that switches its extension direction at the connecting portion between the first and second portions. If the bridge 53a has a curved portion as described above, when an external force applies a force to the bridge 53a in a direction toward the substantially center of the spacer assembly 50, the shape of the bridge 53a can be deformed in a direction to increase the bending angle of the curved portion. As a result, the bridge 53a can cause shape deformation in the height direction of the battery 1 (a direction parallel to the Z axis) to prevent a shape that causes interference with the first current collector 30, and also can prevent the external force applied to the bridge 53a from being transmitted to the spacer portion 51.

[0111] In addition, in Figure 6 contrast to Figure 5 , the anti-ejection portion 54 is not shown. In contrast to the drawing, the anti-ejection portion 54 can also be applied to the structure of the spacer assembly 50 shown in Figure 5 . Figure 6

[0112] As shown in Figure 4 , the bridge 53a can be configured not to contact the region of the housing contact portion 33 of the first current collector 30 other than the region inserted into the crimp portion 22 and / or the lid 40. For example, the connection portion 53 can be positioned so as not to overlap the housing contact portion 33 in the height direction (direction parallel to the Z axis) of the cylindrical battery 1. For example, in the case where the bridge 53a is provided in plural and the housing contact portion 33 is provided in plural, the plural bridges 53a and the plural housing contact portions 33 can be arranged so as to be staggered with each other, so as not to overlap each other in the vertical direction (direction parallel to the Z axis). That is, the housing contact portion 33 can be provided at a position corresponding to the space formed between the bridges 53a adjacent to each other. In this case, even if the shape of the component is deformed due to an external force applied to the housing 20, the possibility of interference between the bridge 53a and the housing contact portion 33 can be significantly reduced, and thus the possibility of a problem such as damage to the coupling portion between the components can be significantly reduced.

[0113] In this case, even if the shape of the spacer assembly 50 is deformed due to a sizing process, a press bonding process, or other reasons of pressing the cylindrical battery 1 in the height direction (direction parallel to the Z axis), the interference between the connection portion 53 of the spacer assembly 50 and the housing contact portion 33 of the first current collector 30 can be minimized. In particular, when the bridge 53a is configured not to contact the lid 40, even if the shape of the housing 20 is deformed due to the sizing process or external impact, the possibility of shape deformation of the bridge 53a can be reduced.

[0114] ​Furthermore, the components constituting the spacer assembly 50 can be integrally formed. For example, the spacer assembly 50, in which the spacer portion 51, the gasket portion 52, and the connecting portion 53 are integrated, can be manufactured by injection molding. That is, the cylindrical battery 1 of this disclosure can achieve the effect of enhancing the sealing force of the opening portion of the housing 20 and preventing the electrode assembly 10 from moving as a single component, which is constructed by an improved manufacturing of the gasket portion for sealing the opening portion of the housing 20. Therefore, according to this disclosure, the complexity of the manufacturing process and the increase in manufacturing costs caused by the application of additional components can be prevented. In addition, according to the structure of the spacer assembly 50 of this disclosure, for example, when an external force such as a crimping process is applied, the force applied to the connecting portion 53 of the spacer assembly 50 in a generally radial direction can be switched to the direction of rotation of the spacer portion 51. Therefore, the spacer portion 51 can be rotated precisely clockwise or counterclockwise in the plane (XY plane) (e.g., it can be rotated about 1 degree), so that stress will not accumulate in the connecting portion 53, thus preventing interference with the current collector 30 due to deformation of the connecting portion 53.

[0115] Reference Figure 7 as well as Figure 5 In the battery 1 that uses the spacer assembly 50 of this disclosure with the stress relief structure described above, even when force is applied to the spacer assembly 50 by the pressing process, it can be found that no abnormal deformation occurs in the current collector.

[0116] Additionally, when external force is applied to an application that does not have a pressing function during the crimping process... Figure 8 When the stress-relief structure of the spacer assembly shown is used in the battery, it can be found that... Figure 9 The spacer assembly shown exhibits significant shape deformation. This deformation applies forces to the current collector, potentially damaging the weld area between the current collector and the electrode assembly, and also causing shape deformation of the electrode assembly.

[0117] Reference Figure 1 , Figure 2 and Figure 11 Terminal 60 is electrically connected to the second uncoated portion 12 of electrode assembly 10. Terminal 60 may pass through approximately the center of a closed portion, for example, formed on the top of housing 20. A portion of terminal 60 may be exposed above housing 20, while the remainder may be located within housing 20. Terminal 60 may be secured to the inner surface of the closed portion of housing 20, for example, by riveting.

[0118] As described above, in the present disclosure, since the case 20 is electrically connected to the first uncoated portion 11 of the electrode assembly 10, the closed portion formed at the top end of the case 20 can serve as a first electrode terminal 20a having a first polarity. Also, since the terminal 60 is electrically connected to the second uncoated portion 12 of the electrode assembly 10, the terminal 60 exposed to the outside of the case 20 can serve as a second electrode terminal.

[0119] That is, the cylindrical battery 1 of the present disclosure has a structure in which a pair of electrode terminals 60, 20a are located in the same direction. Therefore, in the case where a plurality of cylindrical batteries 1 are electrically connected, an electrical connection member such as a busbar can be provided only on one side of the cylindrical battery 1. In this case, the battery pack structure can be simplified and the energy density can be improved. Also, since the cylindrical battery 1 has a structure in which one surface of the case 20 having a substantially flat shape can serve as the first electrode terminal 20a, when an electrical connection member such as a busbar is coupled to the first electrode terminal 20a, a sufficient coupling area can be obtained. Therefore, the cylindrical battery 1 can secure sufficient coupling strength between the electrical connection portion and the first electrode terminal 20a, and can reduce the electrical resistance at the coupling region to a desired level.

[0120] As described above, when the terminal 60 serves as the second electrode terminal, the terminal 60 is electrically insulated from the case 20 having the first polarity. The electrical insulation between the case 20 and the terminal 60 can be implemented in various ways. For example, the insulation can be implemented by interposing an insulating gasket G between the terminal 60 and the case 20. Alternatively, the insulation can be implemented by forming an insulating coating layer on a portion of the terminal 60. Alternatively, the terminal 60 and the case 20 can be arranged to be spaced apart from each other so as not to contact each other, and the terminal 60 can be structurally firmly fixed. Alternatively, in the above-described methods, a plurality of methods can be applied together.

[0121] Also, when the insulating gasket G is used for electrical insulation and is riveted to fix the terminal 60, the insulating gasket G can be deformed together in the riveting process of the terminal 60, thereby being bent toward the inner surface of the closed portion at the top end of the case 20. In the case where the insulating gasket G is made of a resin material, the insulating gasket G can be coupled to the case 20 and the terminal 60 by heat fusion. In this case, the air tightness at the coupling interface between the insulating gasket G and the terminal 60 and the coupling interface between the insulating gasket G and the case 20 can be enhanced.

[0122] Referring to Figure 2 and Figure 11 , the second current collector 70 can be coupled to the upper portion of the electrode assembly 10. The second current collector 70 can be made of an electrically conductive metal material and can be coupled with the second uncoated portion 12. The coupling between the second uncoated portion 12 and the second current collector 70 can be performed, for example, by laser welding.

[0123] Referring to Figure 2 and Figure 11 An insulator 80 can be interposed between the closed portion formed at the top end of the case 20 and the top end of the electrode assembly 10, or between the closed portion and the second current collector 70. The insulator 80 can be made of, for example, an insulating resin material. The insulator 80 can prevent contact between the electrode assembly 10 and the case 20 and / or contact between the electrode assembly 10 and the second current collector 70.

[0124] In addition to the above, the insulator 80 can be interposed between the top end of the outer circumference of the electrode assembly 10 and the inner surface of the case 20. In this case, the second uncoated portion 12 of the electrode assembly 10 can be prevented from contacting the inner surface of the sidewall of the case 20 to cause a short circuit.

[0125] The insulator 80 can have a height corresponding to the distance between the closed portion formed at the top end of the case 20 and the electrode assembly 10 or the distance between the closed portion and the second current collector 70. In this case, the electrode assembly 10 can be prevented from moving within the case 20, thereby significantly reducing the risk of damage to the coupling area for electrical connection between the components. When the insulator 80 is applied together with the spacer assembly 50 described above, the effect of preventing the electrode assembly 10 from moving can be maximized.

[0126] The insulator 80 can have an opening formed at a position corresponding to the winding center hole C of the electrode assembly 10. Through the opening, the terminal 60 can directly contact the second current collector 70.

[0127] The cylindrical battery 1 of the present disclosure described above has a structure in which the welding area is expanded by the curved surface of the uncoated portion, the current path is multiplexed by using the first current collector 30, and the resistance is minimized by minimizing the length of the current path. The AC resistance of the cylindrical battery 1 measured by the resistance between the positive and negative electrodes and between the terminal 60 and the flat surface 20a around it can be about 0.5 to 4 milliohms, preferably about 1 to 4 milliohms (which is suitable for fast charging).

[0128] Preferably, the cylindrical battery can be, for example, a cylindrical battery having a shape factor ratio (the shape factor ratio is defined as the value obtained by dividing the diameter of the cylindrical battery by the height, i.e., the ratio of the diameter (Φ) to the height (H)) greater than about 0.4.

[0129] Here, the form factor refers to a value indicating the diameter and height of a cylindrical battery. Preferably, the cylindrical battery can have a diameter of 40 mm to 50 mm and can have a height of 60 mm to 130 mm. The cylindrical battery according to the embodiments of the present disclosure can be, for example, a 46110 battery, a 4875 battery, a 48110 battery, a 4880 battery, or a 4680 battery. In the numerical value indicating the form factor, the first two numbers indicate the diameter of the battery, and the remaining numbers indicate the height of the battery.

[0130] When the electrode assembly having the jointless structure is applied to a cylindrical battery having a form factor ratio greater than 0.4, stress applied in the radial direction is large when the uncoated portion is bent large, so that the uncoated portion can easily be torn. In addition, when the current collector is welded to the bent surface area of the uncoated portion, it is necessary to sufficiently increase the number of stacked layers of the uncoated portion in the bent surface area in order to sufficiently secure the welding strength and reduce the resistance. This requirement can be achieved by the electrode and the electrode assembly according to the embodiments (modified form) of the present disclosure.

[0131] The battery according to the embodiments of the present disclosure can be a nearly cylindrical battery having a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of 0.418.

[0132] The battery according to another embodiment can be a nearly cylindrical battery having a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of 0.640.

[0133] The battery according to yet another embodiment can be a nearly cylindrical battery having a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of 0.418.

[0134] The battery according to yet another embodiment can be a nearly cylindrical battery having a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of 0.600.

[0135] The battery according to yet another embodiment can be a nearly cylindrical battery having a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of 0.575.

[0136] Conventionally, a battery having a form factor ratio of about 0.4 or less has been used. That is, for example, a 1865 battery, a 2170 battery, or the like has been generally used. The 1865 battery has a diameter of about 18 mm, a height of about 65 mm, and a form factor ratio of 0.277. The 2170 battery has a diameter of about 21 mm, a height of about 70 mm, and a form factor ratio of 0.300.

[0137] Reference Figure 13A plurality of cylindrical batteries 1 can be connected in series and in parallel using bus bars 150 at the upper portions of the cylindrical batteries 1. The number of cylindrical batteries 1 can be increased or decreased in consideration of the capacity of the battery pack.

[0138] In each cylindrical battery 1, the terminal 60 can have a positive polarity, and the outer surface 20a of the closed portion of the case 20 can have a negative polarity, or vice versa.

[0139] Preferably, a plurality of cylindrical batteries 1 can be arranged in a plurality of columns and rows. The columns are provided in a vertical direction based on the drawings, and the rows are provided in a left-right direction based on the drawings. Furthermore, in order to maximize the space efficiency, the cylindrical batteries 1 can be arranged in the closest packed structure. The closest packed structure is formed when equilateral triangles are formed by connecting the centers of the terminals 60 exposed from the cases 20 to each other. Preferably, the bus bars 150 can be provided at the upper portions of the plurality of cylindrical batteries 1, more preferably between adjacent columns. Alternatively, the bus bars 150 can be provided between adjacent rows.

[0140] Preferably, the bus bars 150 connect the cylindrical batteries 1 arranged in the same column in parallel to each other, and connect the cylindrical batteries 1 arranged in two adjacent columns in series to each other.

[0141] Preferably, the bus bars 150 can include a body portion 151, a plurality of first bus bar terminals 152 for series and parallel connection, and a plurality of second bus bar terminals 153.

[0142] The body portion 151 can extend between the terminals 60 of adjacent cylindrical batteries 1, i.e., between the columns of the cylindrical batteries 1. Alternatively, the body portion 151 can extend along the columns of the cylindrical batteries 1, and can be regularly bent in a zigzag shape.

[0143] The plurality of first bus bar terminals 152 can protrusively extend from one side of the body portion 151 toward the terminal 60 of each cylindrical battery 1, and can be electrically coupled to the terminal 60. The electrical coupling between the first bus bar terminal 152 and the terminal 60 can be achieved by laser welding, ultrasonic welding, or the like. Furthermore, the plurality of second bus bar terminals 153 can be electrically coupled to the outer surface 20a of each cylindrical battery 1 from the other side of the body portion 151. The electrical coupling between the second bus bar terminal 153 and the outer surface 20a can be achieved by laser welding, ultrasonic welding, or the like.

[0144] Preferably, the main body portion 151, the plurality of first bus bar terminals 152, and the plurality of second bus bar terminals 153 can be made of one conductive metal plate. The metal plate can be, for example, an aluminum plate or a copper plate, but the present disclosure is not limited thereto. In a modified example, the main body portion 151, the plurality of first bus bar terminals 152, and the second bus bar terminal 153 can be manufactured as separate components and then coupled to each other by welding or the like.

[0145] In the cylindrical battery 1 according to the present disclosure, since the terminal 60 having a positive polarity and the outer surface 20a of the closed portion of the case 20 having a negative polarity are located in the same direction, it is easy to electrically connect the cylindrical battery 1 using the bus bar 150.

[0146] Further, since the terminal 60 of the cylindrical battery 1 and the outer surface 20a of the closed portion of the case 20 have a large area, the coupling region of the bus bar 150 can be sufficiently fixed to sufficiently reduce the electrical resistance of a battery pack including the cylindrical battery 1.

[0147] Referring to Figure 14 , the battery pack 3 according to the embodiment of the present disclosure includes a battery assembly in which a plurality of cylindrical batteries 1 according to the embodiment of the present disclosure are electrically connected, and a battery pack case 2 for accommodating the battery assembly. The plurality of batteries 1 are electrically connected by the bus bar, and other components such as a cooling unit and a power terminal are omitted for convenience. Figure 13 The electrical connection structure of the plurality of batteries 1 by the bus bar is schematically described, and other components such as a cooling unit and a power terminal are omitted for convenience.

[0148] Referring to Figure 15 , the vehicle 5 according to the embodiment of the present disclosure can be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and includes the battery pack 3 according to the embodiment of the present disclosure. The vehicle 5 includes a 4-wheel vehicle and a 2-wheel vehicle. According to the embodiment of the present disclosure, the vehicle 5 is operated by receiving electric power from the battery pack 3.

[0149] The present application has been described in detail. However, it should be understood that although a preferred embodiment of the present disclosure has been indicated, the detailed description and specific examples are given by way of illustration only, since various changes and modifications within the scope of the present disclosure will become apparent to those skilled in the art from this detailed description.

[0150] Reference Signs

[0151] 5: vehicle

[0152] 3: battery pack

[0153] 2: battery pack case

[0154] 1: battery

[0155] 10: electrode assembly

[0156] 11: first uncoated portion

[0157] 12: second uncoated portion

[0158] C: winding center hole

[0159] 20: case

[0160] 20a: first electrode terminal

[0161] 21: edge pressing portion

[0162] 22: edge winding portion

[0163] 30: first current collector

[0164] 31: support portion

[0165] 32: uncoated portion coupling portion

[0166] 33: case contact portion

[0167] H1: first current collector hole

[0168] 40: cover

[0169] 41: exhaust portion

[0170] 50: spacer assembly

[0171] 51: spacer portion

[0172] H2: spacer hole

[0173] 52: gasket portion

[0174] 53: connecting portion

[0175] 53a: bridge

[0176] 54: anti-ejection portion

[0177] 60: terminal (second electrode terminal)

[0178] G: insulating gasket

[0179] 70: second current collector

[0180] 80: insulator

Claims

1. A battery comprising: an electrode assembly having a first uncoated portion and a second uncoated portion; a case having an open portion formed at one side, and configured to accommodate the electrode assembly through the open portion; a first current collector coupled with the first uncoated portion and located within the case; a cap configured to cover the open portion; and a spacer assembly having: a spacer portion interposed between the first current collector and the cap, and configured to prevent movement of the electrode assembly; a gasket portion interposed between the case and the cap, and configured to seal a gap between the cap and the case; and a connection portion configured to connect the spacer portion and the gasket portion, and to rotate the spacer portion when a force exceeding a standard value is applied in a direction from the gasket portion toward the spacer portion. 2.The battery of claim 1, wherein the connection portion includes a plurality of bridges arranged to be spaced apart from each other in a circumferential direction of the electrode assembly. 3.The battery of claim 2, wherein each of the plurality of bridges includes: a first portion connected to the spacer portion; and a second portion connected to the gasket portion. 4.The battery of claim 3, wherein the first portions of the plurality of bridges are inclined to form a predetermined angle with a radial direction of the electrode assembly and are respectively connected to the spacer portion. 5.The battery of claim 4, wherein the first portions of the plurality of bridges are inclined in the same direction. 6.The battery of claim 4, wherein the first portion and the second portion are connected to each other while forming the predetermined angle. 7.The battery of claim 1, wherein, the spacer portion has a height corresponding to a distance between the first current collector and the cap. 8.The battery of claim 1, wherein the spacer portion is located at a center of one surface of the electrode assembly. 9.The battery of claim 1, wherein, the spacer portion has a spacer hole formed at a position corresponding to a winding center hole of the electrode assembly. 10.The battery of claim 9, wherein the spacer assembly has a bullet-proof portion configured to intersect the spacer hole. 11.The battery of claim 1, wherein the case includes: a press edge portion formed by press-fitting an outer circumference of the case; and a roll edge portion configured to extend and bend such that an end portion of the roll edge portion, which defines the open portion below the press edge portion, surrounds an edge of the cap. 12.The battery of claim 11, wherein the gasket portion is bent along the roll edge portion to surround the edge of the cap. 13.The battery of claim 2, wherein the plurality of bridges are configured not to contact the first current collector. 14.The battery of claim 2, wherein The plurality of bridges are configured not to contact the cover.

15. The battery of claim 1, wherein The first current collector includes: a support portion located at a center on one surface of the electrode assembly; an uncoated portion coupling portion configured to extend from the support portion and coupled to the first uncoated portion; and a case contact portion configured to extend from the support portion or from an end of the uncoated portion coupling portion and interposed between the case and the gasket portion.

16. The battery of claim 15, wherein The case includes: a press edge portion formed by press-fitting a portion of a side wall of the case inwardly; and a roll edge portion configured to extend and bend such that an end of the roll edge portion, which defines the open portion below the press edge portion, surrounds an edge of the cover, wherein the case contact portion is in contact with one surface of the press edge portion facing the cover.

17. The battery of claim 15, wherein A first current collector hole is provided in the support portion.

18. The battery of claim 1, wherein, The cover includes a vent portion having a thickness thinner than a surrounding area, and The spacer portion is located more inwardly than the vent portion, thereby not covering the vent portion.

19. The battery of claim 1, wherein, A bottom end of the cover is higher than a bottom end of the case.

20. The battery of claim 1, wherein, The connection portion is disposed not to overlap the case contact portion in a height direction of the battery.

21. A battery pack including the battery of any one of claims 1 to 20.

22. A vehicle including the battery pack of claim 21.

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