Battery, battery pack, and vehicle

Abstract

This invention provides a battery, a battery pack, and a vehicle. The disclosed battery includes: an electrode assembly having a first uncoated portion and a second uncoated portion; a housing having an opening formed on one side and configured to receive the electrode assembly through the opening; a first current collector coupled to the first uncoated portion and located within the housing; a cap configured to cover the opening; and a spacer assembly having: a spacer portion inserted between the first current collector and the cap and configured to prevent movement of the electrode assembly; a pad portion inserted between the housing and the cap and configured to seal the gap between the cap and the housing; and a connecting portion configured to connect the spacer portion and the pad portion and having a bend configured to switch its extension direction between the spacer portion and the pad portion.

Description

Technical Field

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

[0002] In batteries, a coil with positive and negative terminals extending upward and downward along the height direction can be applied to the casing to maximize current collection efficiency. In batteries using a coil with the above structure, the current collector can serve as a medium for connecting 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. Furthermore, the positive current collector can be electrically connected to a terminal, and the negative current collector can be electrically connected to the housing.

[0004] In a battery with the above structure, a relatively large space can be formed between the negative electrode current collector and the cap. Furthermore, an empty space can also be formed between the bottom surface of the casing, which is positioned opposite the cap, and the positive electrode current collector.

[0005] These empty spaces can cause the core to move within the housing, especially in the vertical direction, i.e., along the height of the battery. When the core moves up and down like this, it can damage the joint between the current collector and the electrode connector, as well as the joint between the current collector and the housing, and between the current collector and the terminals.

[0006] Therefore, it is necessary to minimize the movement space of the core. Furthermore, if additional components are used to reduce the core's movement space, the complexity of the process and manufacturing costs may increase; therefore, it is necessary to address these issues by using components that have already been applied in the past. Summary of the Invention

[0007] Technical issues

[0008] This disclosure is designed to address the problems of the prior art, and therefore aims to prevent damage to electrical connections caused by movement of the winding core within the housing.

[0009] Furthermore, this disclosure aims to prevent the movement of the winding core by utilizing components that have been applied in the past in battery manufacturing, thereby preventing the increase in manufacturing process complexity and manufacturing costs due to the application of additional components.

[0010] On the other hand, this disclosure also relates to preventing abnormal deformation of the spacer assembly due to forces applied to it during the battery manufacturing process.

[0011] The technical objectives to be achieved by this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following disclosure other objectives not mentioned herein.

[0012] Technical solution

[0013] In one aspect of this disclosure, a battery is provided, the battery comprising: an electrode assembly having a first uncoated portion and a second uncoated portion; a housing having an opening formed on one side and configured to receive the electrode assembly through the opening; a first current collector connected to the first uncoated portion and located within the housing; a cap configured to cover the opening; and a spacer assembly having: a spacer portion inserted between the first current collector and the cap and configured to prevent movement of the electrode assembly; a pad portion inserted between the housing and the cap and configured to seal a gap between the cap and the housing; and a connecting portion configured to connect the spacer portion and the pad portion and having a bend portion configured to switch its extension direction between the spacer portion and the pad portion.

[0014] The connection may include a plurality of bridges arranged to be spaced apart from each other along the circumference of the electrode assembly.

[0015] The curved portion may have a raised shape in a direction opposite to that toward the first current collector.

[0016] The connecting portion may have a notch, which is configured to partially reduce the cross-sectional area of ​​the connecting portion.

[0017] The notch can be formed to a predetermined depth on the surface facing the first current collector.

[0018] The notch may be located between the curved portion and the spacer portion.

[0019] The spacer portion may have a height corresponding to the distance between the first current collector and the cap.

[0020] The spacer portion may be located at the center of one surface of the electrode assembly.

[0021] The spacer portion may have a spacer hole formed at a position corresponding to the winding center hole of the electrode assembly.

[0022] The spacer assembly may have a pop-out prevention part configured to intersect the spacer hole.

[0023] The housing may include: a press-fit portion formed by press-fitting an outer periphery; and a rolled edge portion configured to extend and bend such that the end of the rolled edge portion defining the opening below the press-fit portion surrounds the edge of the cap.

[0024] The padding portion can be bent along the rolled edge to surround the edge of the cap.

[0025] The multiple bridges can be configured to not contact the first current collector.

[0026] The multiple bridges can be configured not to contact the cap.

[0027] The first current collector may include: a support portion located at the center of one surface of the electrode assembly; an uncoated portion connection portion configured to extend from the support portion and connect to the first uncoated portion; and a housing contact portion configured to extend from the support portion or from one end of the uncoated portion connection portion and be inserted between the housing and the pad portion.

[0028] The housing may include: a crimp portion formed by crimping a portion of a sidewall of the housing toward the inward side; and a rolled edge portion configured to extend and bend such that the end of the rolled edge portion defining the opening below the crimp portion surrounds the edge of the cap.

[0029] The housing contact portion can contact one surface of the press-fit portion facing the cap.

[0030] The cap may include an exhaust section having a thickness thinner than the surrounding area, and

[0031] The spacer portion may be positioned further inward than the exhaust portion so as not to cover the exhaust portion.

[0032] The connecting portion can be positioned so that it does not overlap with the housing contact portion along the height direction of the battery.

[0033] In another aspect of this disclosure, a battery pack is also provided, which includes the battery of the embodiments of this disclosure.

[0034] In another aspect of this disclosure, a vehicle is also provided that includes a battery pack according to embodiments of this disclosure.

[0035] Beneficial effects

[0036] According to one embodiment of this disclosure, movement of the winding core within the housing is minimized, thereby preventing damage to the electrical connections.

[0037] According to another embodiment of this disclosure, by utilizing components that have already been applied in the past instead of applying additional components to prevent core movement, the complexity of the manufacturing process and the increase in manufacturing costs can be prevented.

[0038] According to another embodiment of this disclosure, abnormal deformation of the spacer assembly caused by forces applied to it during the battery manufacturing process can be prevented. Furthermore, by preventing abnormal deformation of the spacer assembly, product defects caused by forces applied to the current collector and / or electrode assembly due to deformation of the spacer assembly can be effectively prevented. Attached Figure Description

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

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

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

[0042] Figure 3 This is a perspective view illustrating an exemplary form of the first current collector applied to this disclosure.

[0043] Figure 4 This is a partial cross-sectional view showing the area where the spacer component of this disclosure is applied.

[0044] Figure 5 and Figure 6 This is a diagram illustrating an exemplary form of the spacing component according to this disclosure.

[0045] Figure 7 It is shown Figure 5 and Figure 6 A partial cross-sectional view of the spacing component.

[0046] Figure 8 This is a diagram of the internal structure of a cylindrical battery using spacers according to the present disclosure, showing that even when force is applied to the spacer assembly according to the crimping process, no abnormal deformation occurs in the spacer, and therefore no abnormal deformation occurs in the current collector.

[0047] Figure 9 This is a diagram showing a spacer without a stress-relieving structure, which is different from the spacer disclosed herein.

[0048] Figure 10 This is a diagram of the internal structure of a cylindrical battery that uses spacers without stress relief structures. It shows that the spacers undergo abnormal deformation due to the force transmitted by the crimping process, resulting in abnormal deformation of the current collector as well.

[0049] Figure 11 This is a plan view showing the bottom surface of the cylindrical battery of this disclosure.

[0050] Figure 12 This is a partial cross-sectional view showing the region where the insulator of this disclosure is applied.

[0051] Figure 13 This is a diagram showing an electrode assembly in which segments of the present disclosure are formed.

[0052] Figure 14 This is a top view showing a plurality of cylindrical batteries connected in series and parallel using busbars according to an embodiment of the present disclosure.

[0053] Figure 15 This is a schematic diagram illustrating a battery pack according to an embodiment of the present disclosure.

[0054] Figure 16 This is a concept diagram illustrating a vehicle according to an embodiment of the present disclosure.

[0055] Figure Labels

[0056] 5: Vehicles

[0057] 3: Battery pack

[0058] 2: Battery pack casing

[0059] 1: Battery

[0060] 10: Electrode assembly

[0061] 11: First uncoated area

[0062] 12: Second uncoated area

[0063] C: Center hole of winding

[0064] 20: Shell

[0065] 20a: First electrode terminal

[0066] 21: Crimping section

[0067] 22: Rolled edge

[0068] 30: First current collector

[0069] 31: Support section

[0070] 32: Uncoated connection part

[0071] 33: Housing contact area

[0072] H1: First manifold hole

[0073] 40: Hat

[0074] 41: Exhaust section

[0075] 50: Spacing component

[0076] 51: Spacing section

[0077] H2: Spacer hole

[0078] 52: Padding section

[0079] 53: Connecting part

[0080] 53a: Bridge

[0081] B: Bend

[0082] N: Notch

[0083] 54: Pop-up Prevention Section

[0084] 60: Terminal (Second Electrode Terminal)

[0085] G: Insulating pad

[0086] 70: Second current collector

[0087] 80: Insulator Detailed Implementation

[0088] In the following, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general and dictionary meaning, but rather is interpreted based on the principle that inventors are allowed to appropriately define terms for best interpretation, and on the meanings and concepts 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; thus, it should be understood that other equivalents and modifications may be made thereto without departing from the scope of the present disclosure.

[0089] Furthermore, to aid in understanding this disclosure, the drawings are not drawn to scale, and the dimensions of some components may be enlarged. Additionally, in different embodiments, the same reference numerals may be assigned to the same elements.

[0090] When interpreting two objects as "identical," it means that these objects are "substantially identical." Therefore, substantially identical objects can include those considered to have low deviations in the art, such as deviations within 5%. Furthermore, when interpreting certain parameters as uniform in a region, this may mean that these parameters are uniform in terms of their mean.

[0091] Although the terms first, second, etc., are used to describe different elements, these elements are not limited by these terms. These terms are used to distinguish one element from another, and unless otherwise stated, the first element can be the second element.

[0092] Throughout the instruction manual, unless otherwise stated, each element may be single or multiple.

[0093] When an element is "above (or below) another element", the element may be on the upper (or lower) surface of the other element, and an intermediate element may exist between the element and the other element above (or below) the element.

[0094] Additionally, when a component is referred to as a “connection,” “link,” or “attachment” to another component, the component may be directly connected to or linked to the other component. However, it should be understood that there may be intermediate components between each component, or each component may be “connected,” “linked,” or “attached” to each other through another component.

[0095] Throughout this specification, unless otherwise expressly stated, “A and / or B” means A or B or both A and B, and unless otherwise expressly stated, “C to D” means C or greater and D or less.

[0096] Reference Figure 1 and Figure 2 The battery 1 according to embodiments of this disclosure can be, for example, a cylindrical battery. The cylindrical battery 1 includes an electrode assembly 10, a housing 20, a first current collector 30, a cap 40, and a spacer assembly 50. The cylindrical battery 1 may also include terminals 60. In addition to the above components, the cylindrical battery 1 may also include an insulating pad G and / or a second current collector 70 and / or an insulator 80. This disclosure is not limited to battery shape and can be applied to batteries of other shapes, such as prismatic batteries.

[0097] Reference Figure 2 , Figure 4 , Figure 12 and Figure 13The 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 diaphragm inserted between the first electrode and the second electrode. The first electrode is either 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.

[0098] The electrode assembly 10 can have, for example, a wound core shape. That is, the electrode assembly 10 can be manufactured by winding a laminate formed by sequentially laminating a first electrode, a diaphragm, and a second electrode at least once. The wound core type electrode assembly 10 can have a wound central hole C formed at its center and extending along the height direction (parallel to the Z-axis). Simultaneously, an additional diaphragm can be provided on the outer periphery of the electrode assembly 10 for insulation from the housing 20.

[0099] The first electrode includes a first conductive substrate and a first electrode active material layer coated on one or both surfaces of the first conductive substrate. At one end of the first conductive substrate in the width direction (parallel to the Z-axis), a first electrode uncoated portion is provided, which is not coated with the first electrode active material. When the first electrode is in an unfolded state, the first electrode uncoated portion has a shape extending longitudinally from one end to the other along the first electrode. The first uncoated portion 11 can serve as a first electrode connector. The first uncoated portion 11 is provided on one surface of the electrode assembly 10. More specifically, the first uncoated portion 11 is provided in the lower part of the electrode assembly 10 housed in the housing 20 along the height direction (parallel to the Z-axis).

[0100] The second electrode includes a second conductive substrate and a second electrode active material layer coated on one or both surfaces of the second conductive substrate. At the other end of the second conductive substrate in the width direction (parallel to the Z-axis), an uncoated portion without the second electrode active material is provided. When the second electrode is in the unfolded state, the uncoated portion of the second electrode has a shape extending longitudinally from one end to the other along the longitudinal direction of the second electrode. The second uncoated portion 12 can serve as a second electrode connector. The second uncoated portion 12 is provided on another surface of the electrode assembly 10. More specifically, the second uncoated portion 12 is provided in the height direction (parallel to the Z-axis) at the upper part of the electrode assembly 10 housed in the housing 20.

[0101] That is, the first uncoated portion 11 and the second uncoated portion 12 extend in opposite directions along the height direction of the electrode assembly 10 (parallel to the Z-axis), i.e., in the height direction of the cylindrical battery 1, and are exposed to the outside of the separator.

[0102] At the same time, refer to Figure 13At least a portion of the first uncoated portion 11 and / or the second uncoated portion 12 may include a plurality of segments F separated along the winding direction of the electrode assembly 10. In this case, the plurality of segments may be bent radially along the electrode assembly 10. The plurality of bent segments may overlap into several layers. In this case, the first current collector 30 and / or the second current collector 70 (explained later) may be coupled to the area where the plurality of segments F overlap in several layers. At the same time, the electrode assembly 10 may include a welding target area, which is a region where the number of overlapping layers of the segments F of the first uncoated portion 11 remains constant along the radial direction of the electrode assembly 10. In this region, since the number of overlapping layers is kept approximately at its maximum value, it may 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 (explained later) in this region. For example, in the case of laser welding, when increasing the laser power to improve the weld quality, this is to prevent the laser beam from penetrating the first uncoated portion 11 and / or the second uncoated portion 12 and damaging the electrode assembly 10. In addition, this is to effectively prevent foreign substances such as welding spatter from being introduced into the electrode assembly 10.

[0103] 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 can be any active material known in the art without limitation.

[0104] In one embodiment, the positive electrode active material may include materials of the general formula A[A x M y ]O 2+z (A includes at least one element selected from 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; 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 chosen such that the compound remains electrically neutral) represents an alkali metal compound.

[0105] In another embodiment, the positive electrode active material may be an alkali metal compound xLiM disclosed in US 6,6770,82, US 6,680,143, etc. 1 O2-(1-x)Li2M 2 O3, where M 1 Includes at least one element with an average oxidation state of 3; M 2 It includes at least one element having an average oxidation state of 4; and 0 ≤ x ≤ 1.

[0106] In yet another embodiment, the positive electrode active material can be made of the general formula Li a M1 x Fe 1-x M 2 y P 1-y M 3 z O 4-z (M 1 includes 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, Al, 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; select the stoichiometric coefficients of a, x, y, and z and the components included in M 1 、M 2 和M 3 and the components in M 2 to keep the compound electrically neutral), or lithium metal phosphate represented by Li3M

[0107] Preferably, the positive electrode active material may include primary particles and / or secondary particles aggregated from primary particles.

[0108] In one embodiment, the negative electrode active material can be a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, 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.

[0109] The separator can be a porous polymer membrane, for example, a porous polymer membrane made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene / butene copolymer, ethylene / hexene copolymer, ethylene / methacrylate copolymer, etc., or a laminate thereof. As another example, the separator can use ordinary porous non-woven fabric, for example, non-woven fabric made of high-melting-point glass fiber, polyethylene terephthalate fiber, etc.

[0110] 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 an interstitial volume exists between adjacent particles.

[0111] Inorganic particles can be made of inorganic materials with a dielectric constant of 5 or greater. Inorganic particles may include at least one material selected from Pb(Zr,Ti)O3 (PZT), Pb... 1-x La x Zr 1-y Ti y O3(PLZT), PB(Mg3Nb) 2 / 3 Materials containing O3, PbTiO3 (PMN-PT), BaTiO3, hafnia (HfO2), SrTiO3, TiO2, Al2O3, ZrO2, SnO2, CeO2, MgO, CaO, ZnO and Y2O3.

[0112] Electrolytes can be those with properties such as A + B - Salts of the structure. Here, A + Including alkali metal cations, such as Li + Na + 、or K + , or a combination thereof, and B - Including those selected 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 in it.

[0113] Electrolytes 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.

[0114] Reference Figure 1 , Figure 2 , Figure 4 and Figure 12 The housing 20 houses the electrode assembly 10 through an opening formed at its bottom end. The housing 20 is a generally cylindrical container with an opening at its bottom end and a closure at its top end. The housing 20 can be made of a conductive material such as metal. The material of the housing 20 can be, for example, 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, together with the electrode assembly 10, houses the electrolyte through the opening formed at its bottom end.

[0115] 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.

[0116] Reference Figure 2 and Figure 4 The housing 20 may include a crimping portion 21 and a rolled edge portion 22 formed at its bottom end. The crimping portion 21 is disposed on the underside of the electrode assembly 10 housed within the housing 20. The crimping portion 21 is formed by crimping the outer periphery of the housing 20. By partially reducing the inner diameter of the housing 20, the crimping portion 21 prevents the electrode assembly 10 from protruding through an opening formed at the bottom end of the housing 20, the size of which approximately corresponds to the width of the housing 20. The crimping portion 21 may also serve as a support portion on which a cap 40 is disposed.

[0117] A rolled edge 22 is formed on the underside of the crimped portion 21. The rolled edge 22 has an extended and curved shape such that the end defining the opening of the housing 20 surrounds the periphery of the edge of the cap 40 while being inserted between the periphery of the edge of the spacer assembly 50.

[0118] Reference Figures 2 to 4The first current collector 30 is connected to the first uncoated portion 11 of the electrode assembly 10 and is located within the housing 20. The first current collector 30 covers at least a portion of a surface at the bottom end of the electrode assembly 10. A connector including the electrode assembly 10 and the first current collector 30 can be inserted into the housing 20 through an opening formed at the bottom end of the housing 20. The first current collector 30 is electrically connected to the housing 20. That is, the first current collector 30 can be used as a medium for electrical connection between the electrode assembly 10 and the housing 20.

[0119] Reference Figure 3 The first current collector 30 may include, for example, a support portion 31, an uncoated portion connecting portion 32, and a housing contact portion 33. The support portion 31 is generally located at the center of a surface formed at the bottom end of the electrode assembly 10. A first current collector hole H1 may be provided in the support portion 31. 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. The first current collector hole H1 can be used as a channel for laser irradiation or for inserting a welding rod for bonding between the terminal 60 and the second current collector 70, as will be explained later. In addition, the first current collector hole H1 can also be used as a channel for the electrolyte to be smoothly immersed into the electrode assembly 10 when electrolyte is injected.

[0120] The uncoated portion connecting portion 32 extends from the support portion 31 and connects to the first uncoated portion 11. For example, multiple uncoated portion connecting portions 32 may be provided. In this case, the multiple uncoated portion connecting portions 32 may have a shape extending radially from the support portion 31. The housing contact portion 33 may be as follows... Figure 3 As shown, it extends from the support 31, or may be connected with... Figure 3 Unlike the diagram, it extends from the end of the uncoated connecting portion 32. One end of the housing contact portion 33 can be inserted between the housing 20 and the pad portion 52 of the spacer assembly 50 (explained later) and contact the housing 20, thereby allowing the housing 20 and the first current collector 30 to be electrically connected. For example, the end of the housing contact portion 33 can contact a surface of the crimp portion 21 facing the cap 40.

[0121] For example, multiple housing contact portions 33 can be provided. In this case, such as Figure 3 As shown, the plurality of housing contact portions 33 may have a shape extending radially from the support portion 31, and at least one housing contact portion 33 may be located between adjacent uncoated portion connecting portions 32. Alternatively, with Figure 3 As shown, the multiple housing contact portions 33 may have shapes that extend from the ends of the multiple uncoated portion connecting portions 32, respectively.

[0122] Reference Figure 2 , Figure 4 and Figure 11The cap 40 covers the opening formed in the housing 20. The cap 40 may be made of, for example, a metallic material to ensure rigidity. The cap 40 forms the lower surface of the cylindrical battery 1. In the cylindrical battery 1 of this disclosure, the cap 40 may be non-polar even when made of a conductive metallic material. Non-polarity means that the cap 40 is electrically insulated from the housing 20 and the terminal 60. Therefore, the cap 40 is not used as a positive or negative terminal. Therefore, the cap 40 does not need to be electrically connected to the electrode assembly 10 and the housing 20, and its material does not necessarily have to be a conductive metal.

[0123] When the housing 20 of this disclosure includes a crimping portion 21, the cap 40 can be disposed on the crimping portion 21 formed in the housing 20. Alternatively, when the housing 20 of this disclosure includes a rolled edge portion 22, the cap 40 is secured by the rolled edge portion 22. Between the cap 40 and the rolled edge portion 22 of the housing 20, the periphery of the edge of the spacer assembly 50 is inserted to ensure the airtightness of the housing 20.

[0124] Reference Figure 4 and Figure 11 The cap 40 may also include a vent 41 to prevent the internal pressure from increasing beyond a preset value due to gas generated inside the housing 20. The vent 41 corresponds to a region of the cap 40 where the thickness is less than the surrounding area. The vent 41 is structurally weaker than the surrounding area. Therefore, when an anomaly occurs in the cylindrical battery 1 causing the internal pressure of the housing 20 to increase to a certain level or greater, the vent 41 may rupture to release the gas generated inside the housing 20. The vent 41 can be formed, for example, by partially reducing the thickness of the housing 20 by creating notches on one or both surfaces of the cap 40.

[0125] like Figure 4 As shown, the bottom end of the cap 40 is preferably higher than the bottom end of the housing 20. In this case, even if the bottom end of the housing 20 contacts the ground or the bottom surface of the housing used for the module or component structure, the cap 40 will not contact the ground or the bottom surface of the housing. Therefore, the phenomenon that the pressure required for the vent 41 to rupture is different from the design value due to the weight of the cylindrical battery 1 can be prevented, and thus the smooth rupture of the vent 41 can be ensured.

[0126] At the same time, when the exhaust section 41 has such Figure 4 and Figure 11 In the case of the closed-loop shape shown, a longer distance from the center of the cap 40 to the exhaust portion 41 is more advantageous in terms of ease of breakage. This is because, when the same exhaust pressure is applied, as the distance from the center of the cap 40 to the exhaust portion 41 increases, the force acting on the exhaust portion 41 increases, thus promoting breakage. Furthermore, a longer distance from the center of the cap 40 to the exhaust portion 41 is more advantageous in terms of the smoothness of the exhaust gas emission. From this perspective, the exhaust portion 41 protrudes downwards along the periphery from the edge of the cap 40 (based on...). Figure 4The formation of a basically flat area around the perimeter of the area (in a downward oriented direction) is advantageous.

[0127] This is publicly available. Figure 11 The illustration shows the exhaust portion 41 being continuously formed and drawn in an approximately circular shape, but this disclosure is not limited thereto. The exhaust portion 41 may be formed discontinuously on the cap 40 and may be formed in a generally circular shape, or it may be formed in a generally straight shape or other shapes.

[0128] Reference Figure 2 and Figures 4 to 7 The spacer assembly 50 is configured to prevent movement of the electrode assembly 10 and enhance the sealing force of the housing 20. Specifically, the spacer assembly 50 is disposed between the cap 40 and the electrode assembly 10 to secure the electrode assembly 10 and seal the housing 20. The spacer assembly 50 may include a central portion for supporting the bottom of the first current collector 30 and a peripheral portion that contacts the housing 20. In this case, the upper surface of the central portion may be 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 cap 40. The central portion may have a spacer hole H2 formed at a location 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 spacer assembly 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 to cover the edge of the cap 40.

[0129] On the other hand, the spacer assembly 50 may include, for example, a spacer portion 51, a pad portion 52, and a connecting portion 53. In addition to the aforementioned components, the spacer assembly 50 may also include a pop-out prevention portion 54. The spacer portion 51 may be inserted between the first current collector 30 and the cap 40 to prevent movement of the electrode assembly 10. The spacer portion 51 may have a height corresponding to the distance between the first current collector 30 and the cap 40. In this case, the spacer portion 51 can effectively prevent the electrode assembly 10 from moving within the housing 20 due to the gap formed between the first current collector 30 and the cap 40. Therefore, the spacer portion 51 can prevent damage to the connection between the electrode assembly 10 and the first current collector 30 and / or the connection between the first current collector 30 and the housing 20.

[0130] The spacer portion 51 may be located approximately at the center of a surface at the bottom end of the electrode assembly 10. The spacer portion 51 may include a spacer 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 spacer hole H2 may be used as a channel for inserting a welding electrode or for laser irradiation. Similar to the first current collector hole H1 described above, the spacer hole H2 may also be used as a channel for the electrolyte to be smoothly immersed into the electrode assembly 10 when electrolyte is injected.

[0131] Meanwhile, the spacer portion 51 can cover the support portion 31 of the first current collector 30, so 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 compress the first current collector 30.

[0132] On the other hand, the spacer 51 may be configured to cover at least a portion of the weld formed by welding the uncoated portion connecting portion 32 and the first uncoated portion 11 of the first current collector 30. That is, the radius of the top end of the spacer 51 may be greater than the distance from the welded portion closest to the core of the electrode assembly 10 to the core of the electrode assembly 10. In this case, the spacer 51 can effectively prevent the welded portion of the first current collector 30 and the first uncoated portion 11 from being damaged, for example, during a crimping process or a sizing process.

[0133] On the other hand, the spacer 51 can be positioned further inward toward the core than the exhaust portion 41 so as not to cover the exhaust portion 41 formed in the cap 40. That is, the radius measured at the top of the spacer 51 can be smaller than the distance from the center of the cap 40 to the exhaust portion 41. This is to prevent the burst pressure of the exhaust portion 41 from differing from the design value because the exhaust portion 41 is covered by the spacer assembly 50.

[0134] A padding portion 52 is disposed between the housing 20 and the cap 40. The padding portion 52 may have a shape extending along the inner circumference of the housing 20. When the housing 20 includes a rolled edge portion 22, the padding portion 52 may be bent along the curved shape of the rolled edge portion 22 to cover the circumferential area of ​​the edge of the cap 40. Alternatively, the padding portion 52 may be bent along the rolled edge portion 22 to fill the gap between the housing contact portion 33 and the cap 40, while covering the edge of the cap 40. In this way, the padding portion 52 can improve the holding force of the cap 40 and the sealing force of the housing 20.

[0135] Meanwhile, in the gasket portion 52, the thickness between the housing contact portion 33 and the cap 40 can be less than the thickness between the crimp portion 21 and the cap 40. This is because, compared to other areas, the gasket portion 52 may be compressed more in the area where the housing contact portion 33 is inserted between the housing 20 and the crimp portion 21. Therefore, in the gasket portion 52, the compression ratio between the housing contact portion 33 and the cap 40 can be greater than the compression ratio between the crimp portion 21 and the cap 40. Alternatively, the gasket portion 52 can be configured such that the compression ratio between the housing contact portion 33 and the cap 40 is approximately the same as the compression ratio between the crimp portion 21 and the cap 40. In this case, when the compression ratio of the gasket portion 52 varies for each area, the phenomenon of partial reduction in sealing force can be prevented.

[0136] The connecting portion 53 connects the spacer portion 51 and the pad portion 52 to each other. The connecting portion 53 is configured to reduce the stress applied to the connecting portion 53 when an external force is applied from the pad portion 52 to the spacer portion 51. Since the connecting portion 53 has a structure that can reduce the above-mentioned stress, it can prevent undesirable effects on the first current collector 30 and the electrode assembly 10 caused by abnormal deformation of the spacer assembly 50 due to external force.

[0137] To achieve this function, the connecting portion 53 may include a bent portion B, the extension direction of which switches between the spacer portion 51 and the padding portion 52. In the region where the bent portion B is formed, a groove with a predetermined depth may be formed on one surface of the connecting portion 53, and a protrusion with a shape corresponding to the groove may be formed on the opposite surface.

[0138] The bend B can be formed, for example, by switching the extension direction of the connecting portion 53 twice. However, the number of times the extension direction of the connecting portion 53 used to form the bend B is not limited. When the connecting portion 53 includes the bend B, the connecting portion 53 can buffer the force exerted by an external force from the padding portion 52 toward the spacer portion 51. When an external force is applied, the shape deformation of the connecting portion 53 can occur naturally in the area formed by the bend B in the direction of increasing bending angle of the bend B, resulting in the external force being absorbed by the bend B and not transmitted to the spacer portion 51. That is, the bend B can be used as a shock absorber, such as a bellows or a spring. Multiple bends B can be provided so that a buffering effect can be effectively provided even when a large external force is applied.

[0139] When an external force is applied, the bent portion B can protrude further in one direction during the process of absorbing the external force. Therefore, in order to prevent the bent portion B from contacting the first current collector 30 and / or the electrode assembly 10, the bent portion B can have a convex shape in the direction opposite to the direction toward the first current collector 30.

[0140] In addition to the aforementioned curved portion B, the connecting portion 53 may also include a notch N. The notch N may be configured to partially reduce the cross-sectional area of ​​the connecting portion 53. The notch N may have a groove shape formed on at least one surface of the connecting portion 53. For example, the notch N may be formed to a predetermined depth on a surface of the connecting portion 53 facing the first current collector 30. When the notch N is formed in this manner on the surface facing the first current collector 30, the shape deformation of the connecting portion 53 due to external forces occurs in the direction opposite to the direction toward the first current collector 30, thereby reducing the risk of interference between the spacer assembly 50 and the first current collector 30 and / or the electrode assembly 10.

[0141] The notch N can be located between the curved portion B and the spacer portion 51 on the connecting portion 53. Similar to the curved portion B, multiple notches N can be provided if necessary.

[0142] The connecting portion 53 may include, for example, a plurality of bridges 53a spaced apart from each other along the circumference of the electrode assembly 10. In this case, the space formed between adjacent bridges 53a can serve as a channel for smooth circulation of electrolyte. On the other hand, the space formed between adjacent bridges 53a can serve as a channel for smooth discharge of internal gas when venting occurs due to an increase in internal pressure. Thus, when the connecting portion 53 includes a plurality of bridges 53a, the bend B for forming the stress relief structure of the present disclosure as described above can be provided in each bridge 53a. In addition, the notch N may also be included in each of the plurality of bridges 53a.

[0143] The pop-out prevention part 54 can be configured to intersect with the spacer hole H2. The pop-out prevention part 54 can be configured to reduce the opening area of ​​the spacer hole H2. For example, the pop-out prevention part 54 can have a generally cross shape. However, this is only an exemplary form of the pop-out prevention part 54, and the shape of the pop-out prevention part 54 is not limited thereto.

[0144] The ejection prevention part 54 can be provided at a position corresponding to the winding 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 increased pressure inside the housing 20, the ejection prevention part 54 can prevent the winding center of the electrode assembly 10 from being ejected outside the housing 20.

[0145] like Figure 4 As shown, the bridge 53a can be configured not to contact the area of ​​the housing contact portion 33 of the first current collector 30, except for the area inserted into the rolled edge portion 22 and / or the cap 40. For example, the connecting portion 53 can be positioned so as not to overlap with the housing contact portion 33 along the height direction (parallel to the Z-axis) of the cylindrical battery 1. For example, when multiple bridges 53a and multiple housing contact portions 33 are provided, the multiple bridges 53a and multiple housing contact portions 33 can be arranged to be staggered so as not to overlap with each other in the vertical 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 adjacent bridges 53a. In this case, even if the shape of the component is deformed due to the external force applied to the housing 20, the possibility of interference between the bridges 53a and the housing contact portion 33 can be significantly reduced, and thus the possibility of problems such as damage to the connection between components can be significantly reduced.

[0146] In this configuration, even if the spacer assembly 50 deforms due to the sizing process, pressing process, or other reasons during the compression of the cylindrical battery 1 along the height direction (parallel to the Z-axis), interference between the connecting portion 53 of the spacer assembly 50 and the housing contact portion 33 of the first current collector 30 can be minimized. Specifically, when the bridge 53a is configured to not contact the cap 40, the possibility of deformation of the bridge 53a can be reduced even if the shape of the housing 20 deforms due to the sizing process or external impact.

[0147] Meanwhile, 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 of the housing 20 and preventing the electrode assembly 10 from moving as a single component, which is constructed by an improved gasket component for sealing the opening 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. Furthermore, 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 generally radially can be deflected in the direction that causes the spacer portion 51 to rotate. Therefore, the spacer portion 51 can rotate slightly clockwise or counterclockwise in the plane (XY plane) (e.g., it can rotate about 1 degree), so that stress does not accumulate in the connecting portion 53, and thus interference with the first current collector 30 due to deformation of the connecting portion 53 can be prevented.

[0148] Reference Figure 8 as well as Figures 5 to 7 In the battery 1 that uses the spacer component 50 of this disclosure with the stress relief structure described above, even when force is applied to the spacer component 50 by a pressing process, it can be found that no abnormal deformation occurs in the current collector.

[0149] At the same time, when external force is applied to the surface through the crimping process, it does not have the following properties. Figure 9 When the stress-relief structure shown is used to install a cell with a spacer assembly, it can be observed that the shape of the spacer assembly deforms as follows: Figure 10 The deformation of the spacer assembly exerts forces on the current collector, which can lead to damage to the weld area between the current collector and the electrode assembly, and also deforms the shape of the electrode assembly.

[0150] As a result of checking the degree of deformation of the spacer assembly 50 after the crimping process, in such cases... Figure 9In the case of the spacer assembly 50 without a stress-relief structure, the connecting portion 53 deforms to move approximately 2.1 mm toward the first current collector 30 and the electrode assembly 10, and the spacer portion 51 also deforms to move approximately 1.69 mm in the same direction. Meanwhile, in the case of the spacer assembly 50 with the bent portion B, the movement caused by the shape deformation of the connecting portion 53 is significantly reduced to approximately 0.2 mm, and the movement of the spacer portion 51 is also reduced to approximately 1.4 mm. Furthermore, as... Figures 5 to 7 As shown, when the spacer assembly 50 has both the bent portion B and the notch portion N, the movement caused by the shape deformation of the connecting portion 53 is approximately 0.2 mm. This shows a similar level of improvement as the spacer assembly 50 with only the bent portion B. However, the movement of the spacer portion 51 is found to be significantly improved to approximately 0.1 mm. Referring to these test results, it can be seen that by applying the stress-relieving structure of this disclosure to the spacer assembly 50, the risk of problems caused by abnormal deformation of the spacer assembly 50 due to external forces applied by the battery manufacturing process or other factors can be significantly reduced or completely prevented.

[0151] Reference Figure 1 , Figure 2 and Figure 12 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 closure formed, for example, 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 closure of housing 20, for example, by riveting.

[0152] As described above, in this disclosure, since the housing 20 is electrically connected to the first uncoated portion 11 of the electrode assembly 10, the closed portion formed at the top of the housing 20 can be used as a first electrode terminal 20a having a first polarity. Meanwhile, since the terminal 60 is electrically connected to the second uncoated portion 12 of the electrode assembly 10, the terminal 60 exposed outside the housing 20 can be used as a second electrode terminal.

[0153] That is, the cylindrical battery 1 of this disclosure has a structure in which a pair of electrode terminals 60, 20a are located in the same direction. Therefore, when multiple cylindrical batteries 1 are electrically connected, an electrical connection component 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. Furthermore, since the cylindrical battery 1 has a structure in which one surface of the housing 20 having a substantially flat shape can be used as the first electrode terminal 20a, a sufficient bonding area can be obtained when an electrical connection component such as a busbar is attached to the first electrode terminal 20a. Therefore, the cylindrical battery 1 can ensure sufficient bonding strength between the electrical connection portion and the first electrode terminal 20a, and the resistance at the bonding area can be reduced to a desired level.

[0154] As described above, when terminal 60 is used as a second electrode terminal, terminal 60 is electrically insulated from housing 20 having a first polarity. Electrical insulation between housing 20 and terminal 60 can be achieved in various ways. For example, insulation can be achieved by inserting an insulating gasket G between terminal 60 and housing 20. Alternatively, insulation can be achieved by forming an insulating coating on a portion of terminal 60. Alternatively, terminal 60 and housing 20 can be arranged spaced apart from each other so as not to contact each other, and terminal 60 can be structurally and securely fixed. Alternatively, multiple methods can be applied together in the above-described manner.

[0155] Simultaneously, when the insulating gasket G is used for electrical insulation and riveted to secure the terminal 60, the insulating gasket G can deform together with the terminal 60 during the riveting process, thereby bending towards the inner surface of the closed portion at the top of the housing 20. When the insulating gasket G is made of resin material, it can be thermally bonded to the housing 20 and the terminal 60. In this case, the airtightness at the connection interface between the insulating gasket G and the terminal 60, as well as at the connection interface between the insulating gasket G and the housing 20, can be enhanced.

[0156] refer to Figure 2 and Figure 12 The second current collector 70 can be connected to the upper part of the electrode assembly 10. The second current collector 70 can be made of a conductive metal material and can be connected to the second uncoated portion 12. The connection between the second uncoated portion 12 and the second current collector 70 can be made, for example, by laser welding.

[0157] Reference Figure 2 and Figure 12 The insulator 80 can be inserted between the closure formed at the top of the housing 20 and the top of the electrode assembly 10, or between the closure 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 housing 20 and / or between the electrode assembly 10 and the second current collector 70.

[0158] In addition to the above, the insulator 80 can also be inserted between the top of the outer periphery of the electrode assembly 10 and the inner surface of the housing 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 housing 20, thereby preventing a short circuit.

[0159] The insulator 80 may have a height corresponding to the distance between the closure formed at the top of the housing 20 and the electrode assembly 10, or the distance between the closure 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 risk of damage to the connection area used for electrical connections between components. When the insulator 80 is used together with the aforementioned spacer 50, the effect of preventing movement of the electrode assembly 10 can be maximized.

[0160] The insulator 80 may have an opening formed at a location 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.

[0161] The cylindrical battery 1 of this disclosure described above has a structure in which the welded area is extended by the curved surface of the uncoated portion, the current path is reused by using the first current collector 30, and the length of the current path is minimized, thereby minimizing the resistance. 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 flat outer surface 20a surrounding it, can be approximately 0.5 milliohms to 4 milliohms, preferably approximately 1 milliohm to 4 milliohms, which is suitable for fast charging.

[0162] Preferably, the cylindrical battery can be, for example, a cylindrical battery with a shape factor ratio (defined as the value obtained by dividing the diameter of the cylindrical battery by its height, i.e., the ratio of diameter (Φ) to height (H)) greater than about 0.4.

[0163] Here, the shape factor refers to the value representing the diameter and height of the cylindrical battery. Preferably, the cylindrical battery may have a diameter of 40 mm to 50 mm and a height of 60 mm to 130 mm. The cylindrical battery according to embodiments of this disclosure may be, for example, a 46110 battery, a 4875 battery, a 48110 battery, a 4880 battery, or a 4680 battery. In the numerical value representing the shape factor, the first two digits represent the diameter of the battery, and the remaining digits represent the height of the battery.

[0164] When an electrode assembly with a seamless structure is applied to a cylindrical battery with a form factor greater than 0.4, the stress applied in the radial direction when the uncoated portion bends is large, making the uncoated portion prone to tearing. Furthermore, when welding the current collector to the curved surface region of the uncoated portion, the number of stacked layers of the uncoated portion in the curved surface region must be sufficiently increased to ensure adequate weld strength and reduce resistance. This requirement can be achieved by electrodes and electrode assemblies according to embodiments (variations) of this disclosure.

[0165] According to embodiments of the present disclosure, the battery may be an approximately cylindrical battery with a diameter of about 46 mm, a height of about 110 mm, and a shape factor ratio of 0.418.

[0166] According to another embodiment, the battery can be an approximately cylindrical battery with a diameter of about 48 mm, a height of about 75 mm, and a shape factor of 0.640.

[0167] According to another embodiment, the battery can be an approximately cylindrical battery with a diameter of about 48 mm, a height of about 110 mm, and a shape factor ratio of 0.418.

[0168] According to another embodiment, the battery can be an approximately cylindrical battery with a diameter of about 48 mm, a height of about 80 mm, and a shape factor of 0.600.

[0169] According to another embodiment, the battery can be an approximately cylindrical battery with a diameter of about 46 mm, a height of about 80 mm, and a shape factor of 0.575.

[0170] Traditionally, batteries with a form factor of approximately 0.4 or less have been used. That is, batteries such as the 1865 and 2170 are commonly used. An 1865 battery has a diameter of approximately 18 mm, a height of approximately 65 mm, and a form factor of 0.277. A 2170 battery has a diameter of approximately 21 mm, a height of approximately 70 mm, and a form factor of 0.300.

[0171] Reference Figure 14 Multiple cylindrical batteries 1 can be connected in series or parallel at the top of the cylindrical batteries 1 using a busbar 150. The number of cylindrical batteries 1 can be increased or decreased depending on the capacity of the battery pack.

[0172] 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.

[0173] Preferably, the plurality of cylindrical batteries 1 can be arranged in multiple columns and rows. Columns are provided in the vertical direction based on the drawings, and rows are provided in the left and right directions based on the drawings. Furthermore, to maximize space efficiency, the cylindrical batteries 1 can be arranged in the most compact packaging structure. The most compact packaging structure is formed when an equilateral triangle is formed by connecting the centers of the terminals 60 exposed from the housing 20 to each other. Preferably, busbars 150 can be disposed on the upper part of the plurality of cylindrical batteries 1, more preferably disposed between adjacent columns. Alternatively, busbars 150 can be disposed between adjacent rows.

[0174] Preferably, the busbars 150 are connected in parallel to each other to cylindrical batteries 1 arranged in the same column, and in series to each other to cylindrical batteries 1 arranged in two adjacent columns.

[0175] Preferably, the busbar 150 may include a main body 151, a plurality of first busbar terminals 152 for series-parallel connection, and a plurality of second busbar terminals 153.

[0176] The main body 151 can extend between the terminals 60 of adjacent cylindrical batteries 1, that is, between the rows of cylindrical batteries 1. Alternatively, the main body 151 can extend along the rows of cylindrical batteries 1 and can be regularly bent into a Z-shape.

[0177] Multiple first busbar terminals 152 can extend from one side of the main body 151 toward the terminal 60 of each cylindrical battery 1 and can be electrically connected to the terminal 60. The electrical connection between the first busbar terminals 152 and the terminal 60 can be achieved by laser welding, ultrasonic welding, or the like. Furthermore, multiple second busbar terminals 153 can be electrically connected from the other side of the main body 151 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.

[0178] Preferably, the main body 151, the plurality of first busbar terminals 152, and the plurality of second busbar terminals 153 can be made of a single conductive metal plate. The metal plate can be, for example, an aluminum plate or a copper plate, but this disclosure is not limited thereto. In a variant, the main body 151, the plurality of first busbar terminals 152, and the second busbar terminals 153 can be manufactured as separate components and then connected to each other by welding or the like.

[0179] In the cylindrical battery 1 according to the present disclosure, since the positive terminal 60 and the outer surface 20a of the closed portion of the housing 20 with negative polarity are located in the same direction, it is easy to electrically connect the cylindrical battery 1 using the busbar 150.

[0180] Furthermore, since the terminals 60 of the cylindrical battery 1 and the outer surface 20a of the closed portion of the housing 20 have a large area, the connection area of ​​the busbar 150 can be sufficiently ensured to sufficiently reduce the resistance of the battery pack including the cylindrical battery 1.

[0181] Reference Figure 15 The battery pack 3 according to an embodiment of the present disclosure includes a battery assembly in which a plurality of cylindrical batteries 1 according to an embodiment of the present disclosure are electrically connected, and a battery pack housing 2 for accommodating the battery assembly. References above. Figure 14 An exemplary electrical connection structure of multiple batteries 1 via a busbar is described, and for convenience, other components such as cooling units and power terminals are omitted.

[0182] See Figure 16The vehicle 5 according to embodiments of the present disclosure may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and includes a battery pack 3 according to embodiments of the present disclosure. Vehicle 5 includes four-wheeled vehicles and two-wheeled vehicles. According to embodiments of the present disclosure, vehicle 5 operates by receiving power from the battery pack 3.

[0183] This disclosure has been described in detail. However, it should be understood that although preferred embodiments of this disclosure have been pointed out, the detailed description and specific examples are given by way of illustration only, as various changes and modifications within the scope of this disclosure will become apparent to those skilled in the art based on the detailed description.

[0184] This application claims priority to Korean Patent Application No. 10-2022-0014958, filed on February 4, 2022, and Korean Patent Application No. 10-2022-0088961, filed on July 19, 2022, the disclosures of which are incorporated herein by reference.

Claims

1. A battery, the battery comprising: An electrode assembly having a first uncoated portion and a second uncoated portion; A housing having an opening formed on one side and configured to receive the electrode assembly through the opening; A first current collector is connected to the first uncoated portion and is located within the housing; A cap, the cap being configured to cover the opening; as well as A spacer assembly having: a spacer portion inserted between the first current collector and the cap, configured to prevent movement of the electrode assembly; and a pad portion inserted between the housing and the cap, configured to seal the gap between the cap and the housing. And a connecting portion configured to connect the spacer portion and the padding portion and having a curved portion configured to switch its extension direction between the spacer portion and the padding portion.

2. The battery according to claim 1, in, The connection includes a plurality of bridges arranged to be spaced apart from each other along the circumference of the electrode assembly.

3. The battery according to claim 1, in, The curved portion has a raised shape in the direction opposite to that toward the first current collector.

4. The battery according to claim 1, in, The connecting portion has a notch that is configured to partially reduce the cross-sectional area of ​​the connecting portion.

5. The battery according to claim 4, in, The notch is formed to a predetermined depth on the surface facing the first current collector.

6. The battery according to claim 4, in, The notch is located between the curved portion and the spacer portion.

7. The battery according to claim 1, in, The spacer portion has a height corresponding to the distance between the first current collector and the cap.

8. The battery according to claim 1, in, The spacer portion is located at the center of one surface of the electrode assembly.

9. The battery according to claim 1, in, The spacer portion has a spacer hole formed at a position corresponding to the winding center hole of the electrode assembly.

10. The battery according to claim 9, in, The spacer assembly has a pop-out prevention part configured to intersect the spacer hole.

11. The battery according to claim 1, in, The housing includes: The press-fit portion is formed by pressing the outer periphery; and A rolled edge portion, the rolled edge portion being configured to extend and bend such that the end of the rolled edge portion defining the opening below the crimp portion surrounds the edge of the cap.

12. The battery according to claim 11, in, The padding portion bends along the rolled edge to surround the edge of the cap.

13. The battery according to claim 2, in, The multiple bridges are configured not to contact the first current collector.

14. The battery according to claim 2, in, The multiple bridges are configured not to contact the cap.

15. The battery according to claim 2, in, The first current collector includes: A support portion located at the center of one surface of the electrode assembly; Uncoated portion connecting portion, the uncoated portion connecting portion being configured to extend from the support portion and connect to the first uncoated portion; and A housing contact portion is configured to extend from the support portion or from one end of the uncoated portion connection portion and is inserted between the housing and the pad portion.

16. The battery according to claim 15, in, The housing includes: A crimping portion, formed by pressing a portion of the sidewall of the housing toward the inward side; and A rolled edge portion, the rolled edge portion being configured to extend and bend such that the end of the rolled edge portion defining the opening below the crimp portion surrounds the edge of the cap. The housing contact portion contacts one surface of the pressing portion facing the cap.

17. The battery according to claim 1, in, The cap includes a venting section, which has a thickness thinner than the surrounding area, and The spacer portion is positioned further inward than the exhaust portion so as not to cover the exhaust portion.

18. The battery according to claim 15, in, The connecting portion is positioned so that it does not overlap with the contact portion of the housing along the height direction of the battery.

19. The battery according to claim 15, in, The first current collector includes multiple housing contact portions, and The plurality of bridges and the plurality of housing contact portions are arranged to be staggered with each other.

20. The battery according to claim 2, in, The connecting portion has multiple notches, which are configured to locally reduce the cross-sectional area of ​​the connecting portion, and Each of the plurality of bridges includes the notch.

21. A battery pack comprising a battery according to any one of claims 1 to 20.

22. A vehicle comprising the battery pack according to claim 21.

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