Secondary battery

Abstract

One or more embodiments of the present disclosure relate to a secondary battery. The secondary battery includes: an electrode assembly; a current collector plate electrically connected to the electrode assembly; a case configured to accommodate the electrode assembly and the current collector plate; a cover plate coupled to the housing; the insulating component is arranged between the cover plate and the current collector plate, and the insulating component comprises an insulating frame and a heat conduction component fixed by the insulating frame.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 2023-0112498 filed in the Korean Intellectual Property Office on August 28, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] Aspects of some embodiments of the present disclosure relate to secondary batteries. Background Art

[0004] Unlike primary batteries that cannot be charged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries in which one battery cell is packaged in the form of a group are used for small portable electronic devices such as mobile phones and video cameras. In addition, large-capacity secondary battery modules in battery pack units in which dozens of battery packs are connected are widely used as motor drive power sources in hybrid vehicles, electric vehicles, etc.

[0005] The secondary battery can be configured by inserting a separator between the positive electrode plate and the negative electrode plate to embed the stacked or wound electrode assembly and the electrolyte into the housing and mounting the cover assembly to the housing. The secondary battery has a structure in which the terminal and the electrode assembly mounted on the cover assembly are electrically connected by a current collector. High temperature is generated in the current collector having a current collecting function, which causes local heating, which causes the temperature of the components to increase significantly and causes uneven temperature in the stack, which affects the life of the secondary battery. In addition, the electrolyte may evaporate due to the high temperature. Therefore, a measure that can solve the temperature rise of the current collector is needed.

[0006] For example, in a conventional secondary battery, an insulating structure is provided for insulating between a current collector and a cap assembly, and the insulating structure is generally formed of a non-conductive plastic material. Because the insulating structure of the plastic material has no electrical conductivity and also has low thermal conductivity, heat cannot naturally escape to the outside.

[0007] The information described above disclosed in the background of the present disclosure is only for enhancement of understanding and therefore may include information that does not constitute related art. Summary of the invention

[0008] The present disclosure is directed to providing a secondary battery capable of effectively dissipating heat of a current collector plate to the outside.

[0009] However, the technical objectives to be solved by the present disclosure are not limited to the aspects described above, and other aspects not mentioned can be clearly understood by those skilled in the art from the description of the present disclosure disclosed below.

[0010] A secondary battery according to one or more embodiments of the present disclosure includes: an electrode assembly; a collector plate electrically connected to the electrode assembly; a shell configured to accommodate the electrode assembly and the collector plate; a cover plate coupled to the shell; and an insulating member between the cover plate and the collector plate, wherein the insulating member includes an insulating frame and a thermally conductive member fixed by the insulating frame.

[0011] The insulation frame may define a cavity passing through upper and lower surfaces of the insulation frame.

[0012] The insulating frame may have a ring shape in a plan view.

[0013] The thermally conductive member may fill the cavity.

[0014] A thickness of the insulation frame and a thickness of the thermal conduction member may be substantially the same.

[0015] The insulation frame may further include a cover plate configured to cover one surface of the insulation frame, and may define a cavity from the one surface to another surface of the insulation frame opposite to the one surface.

[0016] The thermally conductive member may fill the cavity to cover the cover plate.

[0017] The cover plate may have a thickness of about 0.5 mm to about 3 mm.

[0018] The insulating frame may define a plurality of cavities separated from each other.

[0019] The thermally conductive member may include a plurality of thermally conductive material members respectively inserted into the plurality of cavities.

[0020] The thermally conductive member may include one or more of a silicone-based thermally conductive material, an acrylic-based thermally conductive material, and a mixture thereof.

[0021] The insulating frame may include one or more of polyamide (PA), polyethylene (PE), polypropylene (PP) and mixtures thereof.

[0022] The secondary battery may further include a terminal contacting and welded to the current collector plate and exposed through the cap plate.

[0023] The current collector plate may include: an electrode connecting portion welded to an uncoated portion of the electrode of the electrode assembly and extending along a side surface of the electrode assembly; and a terminal connecting portion, one end of which is connected to an upper end of the electrode connecting portion and the other end of which is connected to the terminal.

[0024] The insulating member may be between the terminal connection portion of the current collector plate and the cap plate.

[0025] The insulating member may define a through hole passing through an upper surface and a lower surface of the insulating member, wherein the terminal is coupled to the terminal connection portion of the current collector plate through the cap plate and the through hole of the insulating member.

[0026] The terminal may include: a terminal plate on the cap plate; and a terminal column coupled to the terminal connection portion through the cap plate and the insulating member and coupled to the terminal plate on an upper side of the cap plate.

[0027] An upper surface of the insulating member may contact a lower surface of the cap plate, and a lower surface of the insulating member may contact an upper surface of the current collector plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other aspects of the present disclosure will become more apparent to those skilled in the art by describing in detail embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0029] Figure 1 is a perspective view illustrating a secondary battery according to one or more embodiments of the present disclosure;

[0030] Figure 2 It is along Figure 1 A cross-sectional view taken along line II-II in FIG.

[0031] Figure 3 is an example Figure 1 An exploded perspective view of a state before a current collector plate, an insulating member, and an electrode assembly in a secondary battery are coupled;

[0032] Figure 4 is an exploded perspective view of an insulating member of a secondary battery according to one or more embodiments of the present disclosure;

[0033] Figure 5 is a perspective view of an insulating member of a secondary battery according to one or more other embodiments of the present disclosure;

[0034] Figure 6 is an example Figure 5 An exploded perspective view of a state in which an insulating frame and a heat-conducting member of an insulating member are separated;

[0035] Figure 7 is a perspective view of an insulating member of a secondary battery according to still one or more other embodiments of the present disclosure; and

[0036] Figure 8 is an example Figure 7An exploded perspective view of a state in which an insulating frame and a heat conducting member of an insulating member are separated. DETAILED DESCRIPTION

[0037] Here, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0038] The embodiments of the present disclosure are provided to more completely describe the present disclosure to those skilled in the art, and the following embodiments may be modified into various other forms, and the scope of the present disclosure is not limited to the following embodiments. On the contrary, these embodiments are provided to make the present disclosure more meaningful and complete, and to fully convey the spirit of the present disclosure to those skilled in the art.

[0039] In addition, in the following drawings, for the convenience and clarity of description, the thickness and size of each layer are exaggerated, and the same reference numerals represent the same elements in the drawings. As used in this specification, the term "and / or" includes any one and all combinations of one or more listed items. In addition, the meaning of "connection" in this specification refers not only to the case where component A and component B are directly connected, but also to the case where component C is interposed between component A and component B to indirectly connect component A and component B.

[0040] The terms used in this specification are used to describe specific embodiments and are not intended to limit the present disclosure. As used in this specification, singular forms may include plural forms unless the context clearly states otherwise. In addition, when "including" and / or "comprising" are used in this specification, it is clearly specified that there are mentioned features, numbers, steps, operations, components, elements and / or their groups, and it is not excluded that there are or add one or more other features, numbers, steps, operations, components, elements and / or groups.

[0041] Although the terms first, second, etc. are used in this specification to describe various components, parts, regions, layers and / or parts, it is obvious that these components, parts, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one component, component, region, layer or part from another component, component, region, layer or part. Accordingly, the first component, component, region, layer or part to be described later may refer to the second component, component, region, layer or part without departing from the teachings of the present disclosure.

[0042] Spatial related terms such as "under", "below", "down", "above", and "upper" are used to properly understand one element or feature and another element or feature shown in the drawings. These spatial related terms are provided for proper understanding of the present disclosure according to various process states or use states of the present disclosure, and are not intended to limit the present disclosure. For example, if an element or feature in a figure is turned over, an element or feature described as "under" or "below" becomes "upper" or "above". Therefore, "under" is a concept that covers "above" or "below".

[0043] exist Figure 1 , a perspective view illustrating a secondary battery according to one or more embodiments of the present disclosure is shown. Figure 2 In the figure, it is shown that Figure 1 A cross-sectional view taken along line II-II in FIG. Figure 3 In the example Figure 1 An exploded perspective view of a state before a current collector plate, an insulating member, and an electrode assembly in a secondary battery are coupled.

[0044] refer to Figures 1 to 3 , the secondary battery 100 may include an electrode assembly 110, a first current collector plate 120 and a second current collector plate 130 as current collector plates, a first terminal 140, a second terminal 150, a case 160, a cap plate 170, a first insulating member 180 and a second insulating member 190. In some embodiments, the first terminal 140 may include a first terminal column 141 and a first terminal plate 142, and the second terminal 150 may include a second terminal column 151 and a second terminal plate 152.

[0045] according to Figures 1 to 3 The secondary battery 100 of the embodiment shown in FIG. 1 may have a so-called prismatic structure, for example, a structure in which one cap plate 170 is coupled to a substantially rectangular parallelepiped-shaped case 160 with one side open, and the first and second terminals 140 and 150 protrude outward from the cap plate 170 .

[0046] The present disclosure is not limited to a secondary battery having this structure, and a secondary battery according to one or more other embodiments of the present disclosure may have a side terminal structure, such as the following structure: two cover plates are connected to a housing of a substantially rectangular parallelepiped shape with two sides open facing each other, and two terminals protrude outward from the two cover plates, respectively. Hereinafter, one or more embodiments having a prismatic structure will be described, but it can be understood that in one or more other embodiments, the first insulating member 180 and the second insulating member 190 may be equally applied to the side terminal structure.

[0047] The first terminal 140 and the second terminal 150 of the secondary battery 100 may be electrically connected to the bus bars 201 and 202, respectively, to be connected in parallel or in series with other adjacent secondary batteries. Figure 1 In order to facilitate understanding, the bus bars 201 and 202 are shown in a state where they are separated from the first terminal 140 and the second terminal 150 .

[0048] The electrode assembly 110 may be formed by stacking a plurality of laminates of a first electrode plate, a separator, and a second electrode plate formed in a thin plate or film shape. In some embodiments, the first electrode plate may be operated as a first polarity, such as a positive electrode, and the second electrode plate may be operated as a second polarity, such as a negative electrode. In one or more embodiments, the first electrode plate and the second electrode plate may be positioned with different polarities, according to the choice of those skilled in the art.

[0049] The first electrode plate may be formed by coating a first electrode active material (such as a transition metal oxide, etc.) on a first electrode current collector formed of a metal foil (such as aluminum), and may include a first electrode uncoated portion 111, which is a region where the first electrode active material is not coated. The first electrode uncoated portion 111 may provide a path for current flow between the first electrode plate and the outside.

[0050] In addition, if the first electrode plates are stacked, the first electrode uncoated portions 111 may be formed to overlap at the same position, and a multi-tab structure may be formed. The first electrode uncoated portions 111 may be formed to protrude from one side of the electrode assembly 110. These first electrode uncoated portions 111 may be aligned on one side of the electrode assembly 110 and may protrude from one side of the electrode assembly 110.

[0051] The second electrode plate may be formed by coating a second electrode active material (such as graphite or carbon) on a second electrode current collector formed of a metal foil (such as copper or nickel), and may include a second electrode uncoated portion 112, which is an area where the second electrode active material is not coated. The second electrode uncoated portion 112 provides a path for current flow between the second electrode plate and the outside.

[0052] In addition, if the second electrode plates are stacked, the second electrode uncoated portions 112 may also be formed to overlap at the same position and a multi-tab structure may be formed. The second electrode uncoated portions 112 may be formed to protrude from the other side of the electrode assembly 110.

[0053] The separator may be located between the first electrode plate and the second electrode plate to reduce or prevent the possibility of a short circuit and enable the movement of lithium ions. The separator may be formed of polyethylene, polypropylene, or a composite film of polyethylene and polypropylene. The material of the separator does not limit the scope of the present disclosure.

[0054] In addition, in the electrode assembly 110, if a plurality of electrode plates are stacked, the stacked state can be maintained by a separate insulating tape attached to a partial area of ​​the outer surface. In some embodiments, the insulating tape can maintain the shape of the electrode assembly 110 to allow the electrode uncoated portions 111, 112 and the current collector plates 120, 130 of the electrode assembly 110 to be welded at precise positions, and to allow the electrode assembly 110 to be fixed to maintain the structure of the electrode assembly 110 in the final secondary battery structure.

[0055] In addition, the electrode assembly 110 may be substantially contained in the housing 160 together with the electrolyte. The electrolyte may be composed of an organic solvent such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), or dimethyl carbonate (DMC) and a lithium salt such as LiPF6 or LiBF4. In addition, the electrolyte may be in a liquid, solid, or gel phase.

[0056] The first collector plate 120 may be formed of a conductive material such as aluminum, etc., and may be coupled to the first electrode uncoated portion 111 protruding from one side of the electrode assembly 110 to be electrically connected to the first electrode plate. The first collector plate 120 may be electrically connected to the first electrode uncoated portion 111 by welding. The first collector plate 120 may include a first electrode connection portion 121 extending in a vertical direction along one side surface of the electrode assembly 110, and may include a first terminal connection portion 122 interposed between the electrode assembly 110 and the cap plate 170 and coupled to the first terminal 140.

[0057] refer to Figure 2 and Figure 3 The first electrode connection portion 121 may extend in a vertical direction along one side surface of the electrode assembly 110 and may have an approximately plate shape. The first electrode connection portion 121 may be coupled to the first electrode uncoated portion 111 of the electrode assembly 110 by welding while in contact with the first electrode uncoated portion 111 and may have the first polarity as the first electrode uncoated portion 111.

[0058] The first terminal connection portion 122 may be formed approximately The first terminal connection portion 122 may include an upper portion between the cover plate 170 and the electrode assembly 110 in an approximately plate-like shape, and may include a side portion that is bent from the outer end of the upper portion and extends in a downward direction. In some embodiments, the side portion may extend in a vertical direction along a side surface of the electrode assembly 110. The upper portion of the first terminal connection portion 122 may be positioned parallel to the cover plate 170 and may have a terminal hole passing through the upper surface and the lower surface. The first terminal column 141 may be assembled into the terminal hole and then riveted and / or welded.

[0059] One end or side portion of the first terminal connection portion 122 may be electrically and mechanically coupled to the upper end of the first electrode connection portion 121 by welding, and the other end of the first terminal connection portion 122 may be coupled to the first terminal 140. The first terminal connection portion 122 may be coupled to the first electrode connection portion 121 by welding (e.g., laser welding) to become a first current collector plate 120.

[0060] The second current collector plate 130 may be formed of a conductive material such as nickel, etc., and may contact the second electrode uncoated portion 112 protruding from the other side of the electrode assembly 110 to be electrically connected to the second electrode plate. The second current collector plate 130 may include a second electrode connection portion 131 and a second terminal connection portion 132. Since the shape of the second current collector plate 130 is substantially the same as that of the first current collector plate 120, overlapping descriptions will be omitted.

[0061] The first terminal 140 may be formed of a conductive material such as aluminum and may be electrically connected to the first current collector plate 120. The first terminal 140 may include a first terminal column 141 and a first terminal plate 142. The first terminal column 141 may be coupled to the first terminal plate 142 on the upper side of the cap plate 170. In one or more embodiments, the first terminal 140 may be exposed through the cap plate 170.

[0062] The first terminal column 141 may pass through the cap plate 170 to be electrically connected to the first collector plate 120 at the lower side of the cap plate 170. A lower portion of the first terminal column 141 may be fitted into a terminal hole of the first collector plate 120 to be riveted and / or welded.

[0063] The second terminal 150 is formed of a conductive material such as nickel, etc., and is electrically connected to the second current collector plate 130. The second terminal 150 may include a second terminal column 151 and a second terminal plate 152. Since the shape of the second terminal 150 is substantially the same as that of the first terminal 140, overlapping descriptions will be omitted.

[0064] The case 160 is formed of a conductive metal such as aluminum, an aluminum alloy, or nickel-plated steel, and may be formed in a substantially hexahedral shape having an opening through which the electrode assembly 110, the first collector plate 120, and the second collector plate 130 may be inserted and seated. The cap plate 170 may be coupled to the opening of the case 160 to seal the case 160. The inner surface of the case 160 is generally insulated, so that the possibility of an electrical short circuit occurring inside can be reduced or prevented.

[0065] A sealing gasket 171 may be provided to seal between the first terminal plate 142 and the cap plate 170 and between the first terminal column 141 and the cap plate 170, and similarly, a sealing gasket 172 may be provided to seal between the second terminal plate 152 and the cap plate 170 and between the second terminal column 151 and the cap plate 170. The sealing gaskets 171, 172 are formed of an insulating material and may be formed to have electrical insulation and sealing functions. The sealing gaskets 171, 172 reduce or prevent external moisture from penetrating into the interior of the secondary battery 100 or the electrolyte contained in the secondary battery 100 from leaking to the outside.

[0066] The first insulating member 180 may be provided for electrical insulation and heat transfer between the first terminal connection portion 122 of the first collector plate 120 and the cap plate 170. In addition, the second insulating member 190 may be provided for electrical insulation and heat transfer between the second terminal connection portion 132 of the second collector plate 130 and the cap plate 170. Figure 2 and Figure 3 , the first insulating member 180 may be disposed between an upper surface of the first terminal connection portion 122 of the first current collector plate 120 and a lower surface of the cap plate 170 corresponding to the upper surface of the first terminal connection portion 122. The second insulating member 190 may be disposed between an upper surface of the second terminal connection portion 132 of the second current collector plate 130 and a lower surface of the cap plate 170 corresponding to the upper surface of the second terminal connection portion 132.

[0067] The first insulating member 180 may include an insulating frame 181 and a thermally conductive member (e.g., a thermally conductive material member) 182. The insulating frame 181 may include or be formed of a plastic material having high electrical insulation properties (such as polyamide (PA), polyethylene (PE), polypropylene (PP), and mixtures thereof, etc.). The thermally conductive member 182 may be formed of a thermally conductive material (thermal interface material (TIM)) having a relatively high thermal conductivity, for example, may include or be formed of a thermally conductive material (such as a silicone-based thermally conductive material, an acrylic-based thermally conductive material, and mixtures thereof, etc.). In one or more embodiments, the thermally conductive member 182 may be fixed by the insulating frame 181.

[0068] Since the first insulating member 180 includes the thermally conductive member 182 having appropriate heat transfer performance, the heat of the first collector plate 120 concentrating heat may be naturally transferred to the cap plate 170 through the thermally conductive member 182 , and, for example, heat may be naturally dissipated.

[0069] refer to Figure 4 , the insulating frame 181 may include or define a cavity 186 that accommodates the thermally conductive member 182. In some embodiments, the cavity 186 may be a hole that passes through or connects the upper and lower surfaces of the insulating frame 181. In addition, the cavity 186 may be approximately located at the center of the insulating frame 181 in a plan view. The thermally conductive member 182 may fill the cavity 186 of the insulating frame 181. In one or more embodiments, the insulating frame 181 may have an annular shape surrounding the thermally conductive member 182 in a plan view. In one or more embodiments, the thermally conductive member 182 may include a through hole 185 that passes through the upper and lower surfaces of the thermally conductive member 182, and the first terminal column 141 described above of the first terminal 140 passes through the through hole 185. The upper surface of the thermally conductive member 182 may contact the lower surface of the cap plate 170, and the lower surface of the thermally conductive member 182 may contact the upper surface of the first terminal connection portion 122 of the first current collector plate 120. For example, the thermally conductive member 182 may be formed by applying a liquid type thermally conductive material in the insulating frame 181 and then by curing the liquid type thermally conductive material. The thickness of the insulating frame 181 may be substantially the same as that of the thermally conductive member 182 .

[0070] The second insulating member 190 may have a structure similar to the first insulating member 180 , and may include an insulating frame 191 and a thermal conductive member 192 .

[0071] Figure 5 is a perspective view of an insulating member of a secondary battery according to one or more other embodiments of the present disclosure, and Figure 6 is an example Figure 5 The insulating frame and the heat conducting member of the insulating member are separated from each other. The insulating member 280 can replace Figures 1 to 3 1 and 2. The first insulating member 180 and the second insulating member 190 of the secondary battery shown in FIG.

[0072] refer to Figure 5 and Figure 6, the insulating member 280 includes an insulating frame 281 and a thermally conductive member 282. In some embodiments, the thermally conductive member 282 may include a plurality of thermally conductive material members 282. The insulating frame 281 may define or be formed with a plurality of separated cavities 285, and a plurality of thermally conductive material members 282 are provided and respectively inserted into the plurality of cavities 285. In some embodiments, the plurality of cavities 285 may be in the form of slits extending in one direction, but a plurality of cavities 285 separated in a row direction or a column direction may also be provided. In one or more embodiments, the arrangement of the plurality of cavities 285 may be changed in various ways. Figure 5 and Figure 6 In the embodiment, a through hole may be further provided, through which the first terminal column 141 passes.

[0073] Figure 7 is a perspective view of an insulating member of a secondary battery according to still one or more other embodiments of the present disclosure, and Figure 8 is an example Figure 7 The insulating frame and the heat conducting member of the insulating member are separated from each other. The insulating member 380 can replace Figures 1 to 3 The first insulating member 180 and the second insulating member 190 of the secondary battery shown in FIG. Figure 7 and Figure 8 , the insulating member 380 may include an insulating frame 381 and a thermally conductive member 382. The insulating frame 381 may include a cavity 386 into which the thermally conductive member 382 is inserted, and the insulating frame 381 may be provided with a cover plate 385 covering one surface of the insulating frame 381. In some embodiments, the cavity 386 may have a groove shape provided in a direction from another surface of the insulating frame 381 (which is an opposite surface to the one surface) to the one surface.

[0074] In some embodiments, a through hole 387 through which the first terminal column 141 of the first terminal 140 passes may be formed in the cover plate 385. In addition, the thermally conductive member 382 may have a through hole 388 through which the first terminal column 141 of the first terminal 140 passes. The thermally conductive member 382 may cover the cover plate 385 by filling the inside of the cavity 386. The upper surface of the insulating frame 381 may be located on the same plane as the upper surface of the thermally conductive member 382.

[0075] The cover plate 385 may have a thickness in the range of about 0.5 mm to about 3 mm. Since heat dissipation may not be appropriate if the thickness of the cover plate 385 is too thick, the cover plate 385 is designed to have a thickness that can naturally dissipate heat and ensure structural strength.

[0076] The secondary battery according to one or more embodiments of the present disclosure may effectively dissipate heat of the current collector plate by disposing an insulating member including a thermally conductive member having high thermal conductivity between the current collector plate and the cap plate.

[0077] However, aspects that can be obtained through the present disclosure are not limited to those described above, and other aspects that are not mentioned can be clearly understood by those skilled in the art from the description of the present disclosure described above.

[0078] The above description is only for executing one or more embodiments of the present disclosure, the present disclosure is not limited to the above, and as required by the claims, the technical spirit of the present disclosure will be deemed to enable any technician in the field to make various modifications without departing from the main points of the present disclosure.

Claims

1. A secondary battery comprising: Electrode assembly; a current collector plate electrically connected to the electrode assembly; a housing configured to accommodate the electrode assembly and the current collector plate; a cover plate coupled to the housing; as well as an insulating member, between the cover plate and the current collector plate, The insulating member includes an insulating frame and a heat conducting member fixed by the insulating frame. 2 . The secondary battery according to claim 1 , wherein the insulation frame defines a cavity passing through upper and lower surfaces of the insulation frame. 3 . The secondary battery according to claim 2 , wherein the insulating frame has a ring shape in a plan view. The secondary battery according to claim 2 , wherein the thermally conductive member fills the cavity. 5 . The secondary battery according to claim 4 , wherein a thickness of the insulating frame and a thickness of the thermally conductive member are the same. 6 . The secondary battery according to claim 1 , wherein the insulation frame further comprises a cap plate configured to cover one surface of the insulation frame and define a cavity from the one surface to another surface of the insulation frame opposite to the one surface. 7 . The secondary battery according to claim 6 , wherein the thermally conductive member fills the cavity to cover the cap plate. 8 . The secondary battery according to claim 6 , wherein the cap plate has a thickness of 0.5 mm to 3 mm. 9 . The secondary battery according to claim 1 , wherein the insulation frame defines a plurality of cavities separated from each other. 10 . The secondary battery according to claim 9 , wherein the thermally conductive member comprises a plurality of thermally conductive material members respectively inserted into the plurality of cavities. 11 . The secondary battery according to claim 1 , wherein the thermally conductive member comprises one or more of a silicon-based thermally conductive material, an acrylic-based thermally conductive material, and a mixture thereof. 12 . The secondary battery according to claim 1 , wherein the insulating frame comprises one or more of polyamide, polyethylene, polypropylene, and a mixture thereof. 13 . The secondary battery according to claim 1 , further comprising a terminal contacting and welded to the current collector plate and exposed through the cap plate.

14. The secondary battery according to claim 13, wherein the current collector plate comprises: an electrode connecting portion welded to an uncoated portion of the electrode of the electrode assembly and extending along one side surface of the electrode assembly; as well as A terminal connection portion having one end coupled to the upper end of the electrode connection portion and the other end coupled to the terminal. 15 . The secondary battery according to claim 14 , wherein the insulating member is between the terminal connection portion of the current collector plate and the cap plate.

16. The secondary battery according to claim 14, wherein the insulating member defines a through hole passing through an upper surface and a lower surface of the insulating member, and wherein the terminal is coupled to the terminal connection portion of the current collector plate through the through-holes of the cap plate and the insulating member.

17. The secondary battery according to claim 14, wherein the terminal comprises: A terminal plate, disposed on the cover plate; and a terminal column coupled to the terminal connection portion through the cap plate and the insulating member and coupled to the terminal plate on an upper side of the cap plate. 18 . The secondary battery according to claim 1 , wherein an upper surface of the insulating member contacts a lower surface of the cap plate, and a lower surface of the insulating member contacts an upper surface of the current collector plate.

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