Battery and method for assembling current collector plate of battery

Abstract

A battery and a method for assembling a current collector plate of a battery are provided. The battery includes: an electrode assembly including a first electrode plate, a diaphragm, and a second electrode plate; a first current collector plate contacting a bottom surface of the electrode assembly and electrically connected to the first electrode plate; a second current collector plate contacting a top surface of the electrode assembly and electrically connected to the second electrode plate; a case for accommodating the electrode assembly, the first current collector plate, and the second current collector plate, and electrically connected to the second current collector plate; and a cap plate for sealing an upper opening of the case, in which the second current collector plate includes a main body portion coupled to the second electrode plate; and a wing portion coupled to the main body portion and the housing.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0087088 filed in the Korean Intellectual Property Office on July 5, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] Embodiments relate to a cylindrical secondary battery. Background Art

[0003] Generally, a cylindrical secondary battery includes a cylindrical electrode assembly, a cylindrical can for accommodating the electrode assembly and an electrolyte, and a cap assembly coupled to an opening of one side of the can to seal the can and electrically connected to the electrode assembly to electrically connect an external structure to the electrode assembly.

[0004] Typically, an electrode assembly wound into a cylindrical shape includes a positive electrode substrate material (such as a positive electrode plate), a negative electrode substrate material (such as a negative electrode plate), and a separator. The positive electrode plate is electrically connected to the positive terminal through a positive electrode collector plate, and the negative electrode plate is electrically connected to a can serving as a negative electrode through a negative electrode collector plate. Under this structure, the negative electrode plate, the negative electrode collector plate, and the can are mechanically connected to each other.

[0005] In the related art, a negative electrode collector plate having a plurality of integrated wings (e.g., four wings) is known. A method for connecting the wing of the negative electrode collector plate to the hem portion of the can by laser welding has been used after the negative electrode plate of the electrode assembly is connected to the negative electrode collector plate by laser welding. If such an existing negative electrode collector plate is used, welding defects may occur due to the difference in the total height of the electrode assembly, the difference in the height of the hem portion, and the poor positioning of the wing of the negative electrode collector plate.

[0006] The above information as background technology of the present disclosure is only for enhancement of understanding of the background technology of the present disclosure and therefore may include information that does not constitute relevant technology. Summary of the invention

[0007] Aspects of some embodiments of the present disclosure provide a cylindrical secondary battery capable of eliminating defects that may occur during welding of a current collector plate by improving the structure of the current collector plate.

[0008] According to some embodiments, a battery includes: an electrode assembly, including a first electrode plate, a separator, and a second electrode plate; a first current collector plate, contacting a bottom surface of the electrode assembly and electrically connected to the first electrode plate; a second current collector plate, contacting a top surface of the electrode assembly and electrically connected to the second electrode plate; a shell for accommodating the electrode assembly, the first current collector plate, and the second current collector plate, and electrically connected to the second current collector plate; and a cover plate for sealing an upper opening of the shell, wherein the second current collector plate includes a main body connected to the second electrode plate; and a wing connected to the main body and the shell.

[0009] The body portion may have a circular plate shape, and wherein the wing portion has a ring shape.

[0010] The wing portion may include: a first coupling portion coupled to the body portion; a second coupling portion coupled to the housing; and a connecting portion configured to connect the first coupling portion to the second coupling portion.

[0011] The second coupling portion may be farther from the electrode assembly than the first coupling portion in a vertical direction.

[0012] The second coupling portion may be farther from a radial center than the first coupling portion in a radial direction.

[0013] The housing may include a beaded portion recessed inwardly in a radial direction at an upper portion of the housing, wherein the second coupling portion is coupled to an upper portion of the beaded portion.

[0014] The wing portion may define a first slot extending outwardly from the radially inner end in a radial direction.

[0015] The first slots may be provided in three or more numbers and may be radially symmetrical to each other.

[0016] The wing portion may define a second slot extending inwardly from a radially outer end in the radial direction.

[0017] The body portion may define a gas outlet configured to exhaust gas generated in the housing.

[0018] The housing may include a bead portion that is concave inward in a radial direction, wherein an outer edge region of the wing portion in the radial direction is coupled to the bead portion.

[0019] The housing may further include a crimping portion that is bent inwardly in the radial direction to fix the cover plate, wherein the outer edge region of the wing portion in the radial direction is between the curling portion and the crimping portion.

[0020] The battery may further include a gasket between the curling portion and the crimping portion and surrounding an edge region of the cap plate.

[0021] The battery may further include: a terminal passing through the bottom of the case and including an upper end contacting the first current collector plate; and a gasket between the terminal and the bottom of the case.

[0022] According to some embodiments, a method for assembling a collector plate of a battery is provided, the collector plate comprising a main body portion connected to an electrode plate and a wing portion connected to the main body portion, the method comprising connecting an outer region of the wing portion in a radial direction to a housing of the battery, and connecting an inner region of the wing portion in the radial direction to the main body portion.

[0023] The shell may include a curled edge portion recessed inwardly in the radial direction, wherein the wing portion includes a first connecting portion connected to the main body portion, a second connecting portion connected to the curled edge portion, and a connecting portion connecting the first connecting portion to the second connecting portion, and wherein the second connecting portion is connected to the curled edge portion before the first connecting portion is connected to the main body portion.

[0024] The wing portion may have a ring shape and define a slot extending outwardly from a radial inner end in the radial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The accompanying drawings illustrate embodiments of the present disclosure and together with the description are used to explain aspects of the present disclosure. In the drawings:

[0026] Figure 1 A perspective view illustrating a cylindrical secondary battery according to an embodiment;

[0027] Figure 2 Example Figure 1 A cross-sectional view of a cylindrical secondary battery;

[0028] Figure 3 An exploded perspective view illustrating a second current collector plate of a cylindrical secondary battery according to an embodiment;

[0029] Figure 4 A perspective view illustrating a second current collector plate of a cylindrical secondary battery according to an embodiment;

[0030] Figure 5 A plan view illustrating a wing portion of a second current collector plate of a cylindrical secondary battery according to an embodiment;

[0031] Figure 6Illustrated are diagrams for explaining a process of assembling a second current collector plate of a cylindrical secondary battery according to an embodiment;

[0032] Figure 7 illustrates a plan view of a wing portion of a second current collector plate of a cylindrical secondary battery according to an embodiment; and

[0033] Figure 8 A perspective view illustrating a second current collector plate of a cylindrical secondary battery according to an embodiment. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

[0035] The embodiments of the present disclosure may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art.

[0036] In addition, in the following figures, for convenience and clarity of description, the size (e.g., thickness) of each layer is enlarged, and the same reference numerals in the figures refer to the same elements. As used herein, the term "and / or" includes any and all combinations of one or more related listed items. In this specification, it will also be understood that if component A is referred to as being connected to component B, then component A may be directly connected to component B or indirectly connected to component B with component C between them.

[0037] The terms used in this specification are only for the illustrative purpose of the present disclosure, and should not be interpreted as limiting the meaning or scope of the present disclosure. As used in this specification, unless the special circumstances in the context are clearly indicated, the singular form may include the plural form. In addition, the expressions "including" and / or "comprising" used in this specification neither limit the shapes, quantities, processes, operations, components, elements and / or their groups mentioned, nor exclude the existence or addition of one or more other different shapes, quantities, processes, operations, components, elements and / or their groups.

[0038] As used herein, terms such as "first", "second", etc. are used to describe various components, parts, regions, layers and / or parts. However, it is apparent that these components, parts, regions, layers and / or parts should not be limited by these terms. These terms do not imply a specific order, top or bottom, or superiority, and are only used to distinguish one component, component, region, layer or part from another component, component, region, layer or part. Therefore, without departing from the teachings of the present disclosure, the first component, component, region, layer or part to be described may also refer to the second component, component, region, layer or part.

[0039] For ease of description, spatially relative terms such as "below", "under", "down", "above", "on", etc. may be used herein to describe the relationship between an element or feature and another element or feature as illustrated in the figure. These spatially relative terms are intended to facilitate understanding of the present disclosure according to various process states or use states of the present disclosure, and therefore the present disclosure is not limited thereto. For example, if the elements or features shown in the figure are flipped, the elements or features described as "below" or "below" may become "above" or "on". Therefore, the term "below" may include the terms "above" and "below".

[0040] Figure 1 A perspective view illustrating a cylindrical secondary battery according to an embodiment, and Figure 2 Example Figure 1 Cross-sectional view of a cylindrical secondary battery.

[0041] refer to Figure 1 and Figure 2 According to an embodiment, a cylindrical secondary battery 100 may include a shell 110, an electrode assembly 120 accommodated inside the shell 110, a terminal 150 connected to the shell 110 at a terminal hole 111a defined in one end (e.g., the lower end of the shell 110), and a cap plate 160 that seals an opening defined in the other end (e.g., the upper end of the shell 110).

[0042] The housing 110 may include a circular bottom 111 and a side 112 extending upward by a certain length (eg, a predetermined length) from an edge of the bottom 111. The bottom 111 and the side 112 of the housing 110 may be integrated with each other.

[0043] The circular bottom 111 may have a flat circular plate shape and may be provided with a terminal hole 111a passing through its central portion. The terminal 150 may be inserted into the terminal hole 111a of the bottom 111 and connected to the terminal hole 111a. A first gasket 115 for sealing and electrical insulation may be further placed between the terminal hole 111a and the terminal 150. The first gasket 115 may prevent contact between the terminal 150 and the housing 110 to electrically isolate the terminal 150 and the housing 110 from each other. The terminal hole 111a of the bottom 111 of the housing 110 may be sealed by the first gasket 115. The first gasket 115 may be made of a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc.

[0044] In the cylindrical secondary battery 100, the upper portion of the housing 110 may be opened during the manufacturing process. In some embodiments, during the manufacturing process of the cylindrical secondary battery 100, the electrode assembly 120 may be inserted together with the electrolyte through the open upper end of the housing 110. As described above, after the electrolyte and the electrode assembly 120 are inserted into the housing 110, the cover plate 160 may be coupled to the open upper portion to seal the interior of the housing 110. The electrolyte may enable lithium ions to move between the positive electrode plate 121 and the negative electrode plate 122 constituting the electrode assembly 120. The electrolyte may be a non-aqueous organic electrolyte that is a mixture of a lithium salt and a high-purity organic solvent. In addition, the electrolyte may be a polymer using a polymer electrolyte or a solid electrolyte, and the type of electrolyte is not limited here.

[0045] The housing 110 may be made of steel, steel alloy, aluminum, aluminum alloy, or equivalents thereof, but the material thereof is not limited thereto. In some embodiments, a curling portion 113 that is concave inwardly in the radial direction may be defined at a lower portion of the housing 110 relative to the cover plate 160, and a crimping portion 114 that is bent inwardly may be provided at an upper portion of the housing 110 to reduce or prevent the possibility of the cover plate 160 being separated to the outside. After the electrode assembly 120 is inserted through the open upper end of the housing 110, the curling portion 113 may be provided to reduce or prevent the possibility of the electrode assembly 120 being separated from the housing 110.

[0046] The electrode assembly 120 may include a first electrode plate 121, a second electrode plate 122, and a separator 123. The first electrode plate 121 may be a positive electrode plate, and the second electrode plate 122 may be a negative electrode plate, or vice versa. Hereinafter, for ease of description, the first electrode plate 121 will be referred to as a positive electrode plate, and the second electrode plate 122 will be referred to as a negative electrode plate.

[0047] The first electrode plate 121 may be provided by coating a positive electrode active material made of a transition metal oxide on at least one surface of a plate-shaped metal foil made of aluminum (Al). In some embodiments, the first electrode plate 121 may be provided at its lower end with a positive electrode uncoated portion on which the positive electrode active material is not coated. The positive electrode uncoated portion may protrude downward from the electrode assembly 120. In some embodiments, the positive electrode uncoated portion may protrude further downward than the second electrode plate 122 and the separator 123.

[0048] The second electrode plate 122 may be provided by coating a negative electrode active material such as graphite or carbon on at least one surface of a plate-shaped metal foil made of copper (Cu) or nickel (Ni). In some embodiments, the second electrode plate 122 may be provided with a negative electrode uncoated portion at its upper end that is not coated with a negative electrode active material. The negative electrode uncoated portion may protrude toward the upper side of the electrode assembly 120. In some embodiments, the negative electrode uncoated portion of the second electrode plate 122 may protrude further upward than the first electrode plate 121 and the separator 123.

[0049] The separator 123 may be made of a material such as polyethylene (PE) or polypropylene (PP), but the embodiment is not limited thereto. The separator 123 may be located between the first electrode plate 121 and the second electrode plate 122 to reduce or prevent the possibility of a short circuit and allow only lithium ions to move.

[0050] After stacking the first electrode plate 121, the second electrode plate 122, and the separator 123, the electrode assembly 120 may be wound into a substantially cylindrical shape starting from the winding front end. In some embodiments, in the electrode assembly 120, the positive electrode uncoated portion not coated with the positive electrode active material may protrude downward from the first electrode plate 121, and the negative electrode uncoated portion not coated with the negative electrode active material may protrude upward from the second electrode plate 122.

[0051] The first collector plate 130 may be a circular metal plate having a shape corresponding to the bottom surface of the electrode assembly 120. The plane size of the first collector plate 130 may be equal to or smaller than the size of the bottom surface of the electrode assembly 120. The first collector plate 130 may be made of aluminum (Al). The first collector plate 130 may be fixed and electrically connected to the first electrode plate 121 exposed to the lower side of the electrode assembly 120 by welding in a state where the top surface of the first collector plate 130 contacts the bottom surface of the electrode assembly 120. The first collector plate 130 may be fixed and electrically connected to the terminal 150 by welding in a state where the bottom surface of the first collector plate 130 contacts the top surface of the terminal 150. The first collector plate 130 may be used as a current flow path between the first electrode plate 121 of the electrode assembly 120 and the terminal 150. The first collector plate 130 may be accommodated in the housing 110.

[0052] Figure 3 , Figure 4 and Figure 5 The second current collector plate of the cylindrical secondary battery according to the embodiment is illustrated. Figure 2 , Figure 3 , Figure 4 and Figure 5The second current collector plate 140 may include a circular body portion 141 corresponding to the top surface of the electrode assembly 120 and a wing portion 142 coupled to the body portion 141. The second current collector plate 140 may be received in the case 110.

[0053] The body part 141 may have a circular plate shape corresponding to the shape of the top surface of the electrode assembly 120, and the bottom surface of the body part 141 may be in contact with the top surface of the electrode assembly 120. The bottom surface of the body part 141 may be fixed and electrically connected to the second electrode plate 122 exposed to the upper side of the electrode assembly 120 by welding in a state of being in contact with the top surface of the electrode assembly 120.

[0054] The wing portion 142 may have a generally ring shape, and may be configured to be respectively coupled to the crimping portion 113 and the main body portion 141 of the housing 110. In some embodiments, the outer edge region of the wing portion 142 in the radial direction may be coupled to the crimping portion 113. In some embodiments, the outer edge region of the wing portion 142 in the radial direction may be between the crimping portion 113 and the crimping portion 114. The wing portion 142 may include a first coupling portion 1421 coupled to the main body portion 141, a second coupling portion 1422 coupled to the crimping portion 113 (e.g., an upper portion of the crimping portion 113) of the housing 110, and a connecting portion 1423 connecting the first coupling portion 1421 to the second coupling portion 1422. The first coupling portion 1421 may have a ring shape, and the bottom surface of the first coupling portion 1421 may be in contact with the top surface of the main body portion 141. The bottom surface of the first coupling portion 1421 may be fixed and electrically connected to the main body portion 141 by welding in a state of contacting the top surface of the main body portion 141. The second coupling portion 1422 may have a ring shape, and the bottom surface of the second coupling portion 1422 may be in contact with the top surface of the crimping portion 113. The bottom surface of the second coupling portion 1422 may be fixed and electrically connected to the crimping portion 113 by welding in a state of being in contact with the top surface of the crimping portion 113. If the first coupling portion 1421 and the second coupling portion 1422, both having a ring shape, are welded, the welding may be performed along a substantially circular welding line, such as laser welding. Figure 2 , the curling portion 113 may be located on the main body portion 141 to which the first coupling portion 1421 is coupled in the vertical direction, and the second coupling portion 1422 may be located on the curling portion 113 in the vertical direction. That is, the second coupling portion 1422 is farther from the electrode assembly 120 than the first coupling portion 1421 in the vertical direction. In some embodiments, the second coupling portion 1422 may be located on the main body portion 141 to which the first coupling portion 1421 is coupled in the vertical direction. Figure 1The second coupling portion 1422 is located outside the first coupling portion 1421 in a radial direction (e.g., horizontal direction) in the radial direction. That is, the second coupling portion 1422 is farther from the radial center than the first coupling portion 1421 in the radial direction. The connecting portion 1423 can connect the radial outer end of the first coupling portion 1421 to the radial inner end of the second coupling portion 1422. In some embodiments, the connecting portion 1423 can have a shape that expands radially outward as it moves upward.

[0055] Due to the above structure, the second current collector plate 140 may serve as a current flow path between the second electrode plate 122 of the electrode assembly 120 and the case 110. In some embodiments, the case 110 may be a negative electrode terminal.

[0056] The annular wing 142 may be provided with or may define a plurality of slits (or slots) 1425. Figure 3 to Figure 5 , each of the slits 1425 may be defined to extend a certain length (e.g., a predetermined length) from the radial inner end to the radial outer end. In some embodiments, the radial inner end of the annular wing portion 142 may be divided into a plurality of regions by the slits 1425, and the outer portion of the wing portion 142 may have an annular structure that is continuous in the circumferential direction. In some embodiments, the first coupling portion 1421 and the connecting portion 1423 may be divided into a plurality of regions by the slits 1425, and the second coupling portion 1422 may have a structure that extends continuously in the circumferential direction. Three or more slits 1425 may be defined in the wing portion 142. In some embodiments, the plurality of slits 1425 in the wing portion 142 may be arranged to achieve radial symmetry. The second current collector plate 140 may solve welding defects caused by poor positioning due to the total height difference of the electrode assembly 120, and may solve welding position deviations caused by the height difference of the curling portion, thereby solving welding position defects caused by welding deviations.

[0057] The terminal 150 may be inserted into a terminal hole 111a provided in the bottom 111 of the housing 110 and may be electrically connected to the first current collector plate 130. In some embodiments, the terminal 150 may be a positive electrode terminal. The terminal 150 and the housing 110 may have different polarities. The terminal 150 may be made of the same or similar material as each of the first current collector plate 130 and the first electrode plate 121. In the terminal 150, each of the diameter of the portion of the terminal 150 exposed to the lower side of the housing 110 and the diameter of the portion located inside the housing 110 may be greater than the diameter of the portion of the terminal 150 located in the terminal hole 111a.

[0058] The terminal 150 may include a head 151 that is a portion exposed to the lower side of the housing 110 and a coupling portion 152 that is a portion located inside the housing 110 to face the electrode assembly 120. The terminal 150 may be coupled to the terminal hole 111a of the housing 110 at an intermediate position from the outside to the inside. In some embodiments, the head 151 may be located outside the housing 110. In some embodiments, the coupling portion 152 may be compressed and deformed (e.g., compressed and molded) by riveting, and thus may be squeezed in a state where the first gasket 115 is placed on the upper surface of the bottom 111. In some embodiments, the head 151 may be in close contact with the lower surface of the bottom 111, with the first gasket 115 between them. In some embodiments, the first gasket 115 may be placed between the terminal 150 and the terminal hole 111a to electrically insulate the terminal 150 from the housing 110, and the terminal 150 and the housing 110 may be sealed. The terminal 150 may be electrically connected to the first electrode plate 121 of the electrode assembly 120 through the first current collector plate 130.

[0059] Due to the above structure, the first current collector plate 130 may serve as a current flow path between the first electrode plate 121 of the electrode assembly 120 and the terminal 150. In some embodiments, the terminal 150 may be a positive electrode terminal.

[0060] The cap plate 160 may be provided as a circular metal plate and may be coupled to the upper end of the housing 110. The top surface of the cap plate 160 may be exposed to the outside. The cap plate 160 may be coupled to the upper end of the housing 110 in a state where the second liner 116 is inserted, thereby being electrically insulated from the housing 110. Since the cap plate 160 is not electrically connected to the positive electrode or the negative electrode of the electrode assembly 120, there may be no separate electrical polarity. The cap plate 160 may be made of aluminum, an aluminum alloy, or an equivalent.

[0061] The cover plate 160 may include a central area 161 and an edge area 162, and the edge area 162 of the cover plate 160 may be fixed in a state of being located between the curling portion 113 and the crimping portion 114 of the housing 110. In some embodiments, the cover plate 160 may be placed on the upper portion in a state where the second gasket 116 is located on the upper portion of the curling portion 113 of the housing 110. Thereafter, the crimping portion 114 of the housing 110 may be bent toward the inner side of the cover plate 160 in a radial direction to press the second gasket 116, thereby fixing the cover plate 160 to the housing 110. The second gasket 116 may be made of a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc. The second gasket 116 may press the housing 110 and the cover plate 160 to seal the gap between the housing 110 and the cover plate 160, thereby reducing or preventing the possibility of the cover plate 160 being separated from the housing 110. In some embodiments, the second gasket 116 may be between the curled portion 113 and the crimped portion 114 and may surround an edge region 162 of the cover plate 160 .

[0062] The cap plate 160 may include a vent portion 163 defined in the central region 161 to be opened by rupture pressure. The vent portion 163 may be a recess defined from a top surface to a bottom surface of the cap plate 160.

[0063] Figure 6 The process of assembling the second current collector plate 140 by sequentially assembling the body part 141 and the wing part 142 is illustrated if a cylindrical secondary battery is manufactured. Figure 6 , a method of assembling a second current collector plate (eg, a negative electrode current collector plate) of a cylindrical secondary battery according to an embodiment will be described. As described above, the second current collector plate 140 may be assembled by coupling the body portion 141 to the wing portion 142. Figure 6 As illustrated in (a), the body portion 141 may be fixed to the electrode assembly 120 by welding (eg, laser welding). Figure 6 As illustrated in (b), the body portion 141 and the electrode assembly 120 coupled to each other may be inserted into the case 110 to form the bead portion 113. Figure 6As illustrated in (c), the wing 142 can be positioned on the main body 141 and the curling portion 113, and can be fixed by welding (e.g., laser welding). In some embodiments, in the double welding connection, the welding between the outer area of ​​the wing 142 in the radial direction (e.g., the second connection portion 1422) and the shell 110 (e.g., the curling portion 113) can be performed first, and then the welding between the inner area of ​​the wing 142 in the radial direction (e.g., the first connection portion 1421) and the main body 141 can be performed. When the wing 142 is fixed by welding, the outer area suitable for fixing (e.g., the second connection portion 1422) can be welded first, and then the deformable inner area (e.g., the first connection portion 1421) can be welded. As a result, the total height difference of the electrode assembly 120, the height difference of the curling portion 113, etc. can be absorbed by the slit 1425 and the connecting portion 1423, and stable and firm welding can be achieved.

[0064] Figure 7 A plan view of the wing 242 of the second current collector plate of a cylindrical secondary battery according to other embodiments is illustrated. For the same components as those in the aforementioned embodiments, the same names will be described, and their repeated descriptions will be omitted. As in the aforementioned embodiments, the wing 242 may include a first connecting portion 2421 for connecting to the main body portion 141, a second connecting portion 2422 for connecting to the curling portion 113, and a connecting portion 2423 connecting the first connecting portion 2421 and the second connecting portion 2422 to each other. In some embodiments, a plurality of slits (or slots) 2425 extending radially outward from the radial inner end of the annular wing 242 may be defined. In some embodiments, the wing 242 may further include a plurality of outer slits (or slots) 2427 extending a certain length (e.g., a predetermined length) from the radial outer end to the radial inside. For example, referring to Figure 7 , the outer slit 2427 may extend from the radially outer end of the wing portion 242 to the middle portion of the connecting portion 2423. Due to the outer slit 2427, the shape of the wing portion 242 may be deformed more smoothly, resulting in a more stable weld.

[0065] Figure 8 A perspective view of a second current collector plate 240 of a cylindrical secondary battery according to other embodiments is illustrated. The second current collector plate 240 may include a body portion 241 and a wing portion 142. Since the wing portion 142 is the same as the wing portion 142 according to the previous embodiment, its description will be omitted. The body portion 241 may be provided with a gas outlet 2411 for discharging gas generated in the housing 110 when the internal pressure increases. Figure 8 , the gas outlet 2411 may have a slit shape, but the gas outlet 2411 may be changed to various shapes such as a simple hole. Due to the gas outlet 2411, an increase in the internal pressure within the secondary battery may be reduced or prevented.

[0066] In some embodiments, since the second current collector plate includes a main body portion of the second electrode plate connected to the electrode assembly and wing portions respectively fixed to the main body portion and the shell, the total height difference of the electrode assembly, welding defects caused by the height difference of the rolled edge portion, and poor positioning of the wing portion of the negative electrode current collector plate can be solved.

[0067] The above are only some embodiments of cylindrical secondary batteries, and the present disclosure is not limited to the above. In addition, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the claims including their functional equivalents.

Claims

1. A battery comprising: An electrode assembly, comprising a first electrode plate, a separator and a second electrode plate; a first current collector plate contacting a bottom surface of the electrode assembly and electrically connected to the first electrode plate; a second current collector plate contacting a top surface of the electrode assembly and electrically connected to the second electrode plate; a housing for accommodating the electrode assembly, the first current collector plate and the second current collector plate, and electrically connected to the second current collector plate; as well as a cover plate, used to seal the upper opening of the housing, The second current collector plate comprises: a main body portion, coupled to the second electrode plate; and A wing portion is coupled to the main body portion and the housing.

2. The battery according to claim 1, wherein the main body has a circular plate shape, and The wing portion has a ring shape.

3. The battery according to claim 2, wherein the wing portion comprises: a first connecting portion connected to the main body; a second coupling portion coupled to the housing; as well as A connecting portion is configured to connect the first connecting portion to the second connecting portion. 4 . The battery according to claim 3 , wherein the second coupling portion is farther from the electrode assembly than the first coupling portion in a vertical direction. The battery according to claim 3 , wherein the second coupling portion is farther from a radial center in a radial direction than the first coupling portion.

6. The battery according to claim 3, wherein the case includes a bead portion recessed inwardly in a radial direction at an upper portion of the case, and The second coupling portion is coupled to an upper portion of the curling portion. 7 . The battery of claim 2 , wherein the wing portion defines a first slot extending outwardly from a radially inner end in a radial direction. 8 . The battery according to claim 7 , wherein the first slots are provided in three or more numbers and are radially symmetrical to each other. 9 . The battery of claim 7 , wherein the wing portion defines a second slot extending inwardly from a radially outer end in the radial direction. 10 . The battery according to claim 1 , wherein the body portion defines a gas outlet configured to discharge gas generated in the case.

11. The battery according to claim 1, wherein the housing includes a curling portion that is concave inward in a radial direction, and An outer edge region of the wing portion in the radial direction is coupled to the curled edge portion.

12. The battery according to claim 11, wherein the housing further comprises a crimping portion, the crimping portion being bent inwardly in the radial direction to fix the cover plate, and The outer edge region of the wing portion in the radial direction is between the curling portion and the crimping portion. 13 . The battery according to claim 12 , further comprising a gasket between the curled portion and the crimped portion and surrounding an edge region of the cap plate.

14. The battery according to claim 1, further comprising: a terminal passing through the bottom of the housing and including an upper end contacting the first current collector plate; as well as A gasket is between the terminal and the bottom of the housing.

15. A method for assembling a collector plate of a battery, the collector plate comprising a main body connected to an electrode plate and a wing connected to the main body, the method comprising connecting an outer region of the wing in a radial direction to a housing of the battery, and connecting an inner region of the wing in the radial direction to the main body.

16. The method according to claim 15, wherein the housing includes a curling portion that is recessed inwardly in the radial direction, wherein the wing portion includes a first coupling portion coupled to the main body portion, a second coupling portion coupled to the curling portion, and a connecting portion connecting the first coupling portion to the second coupling portion, and The second coupling portion is coupled to the curling portion before the first coupling portion is coupled to the main body portion. 17 . The method of claim 16 , wherein the wing has a ring shape and defines a slot extending outwardly from a radially inner end in the radial direction.

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