Secondary battery

Abstract

There is provided a secondary battery including: an electrode assembly; a case including an internal space in which the electrode assembly is accommodated; a cap plate configured to seal the housing; a first electrode portion electrically connected to the electrode assembly and fixed to the cap plate; a second electrode portion spaced apart from the first electrode portion, electrically connected to the electrode assembly, and fixed to the cap plate; and a heat dissipation portion between the electrode assembly and the cap plate and in contact with at least one of the first electrode portion and the second electrode portion.

Description

[0001] This application claims the priority and benefit of Korean Patent Application No. 10-2023-0176136, filed with the Korean Intellectual Property Office on December 7, 2023, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] Aspects of some embodiments of the present disclosure relate to a secondary battery. Background Art

[0003] Unlike primary batteries that generally cannot be recharged, secondary batteries are generally batteries that can be recharged and discharged. Low-capacity secondary batteries can be used in portable small electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, and high-capacity secondary batteries are widely used as power sources for driving motors and as power storage batteries in hybrid vehicles or electric vehicles. A secondary battery may include an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, electrode terminals connected to the electrode assembly, and the like.

[0004] The above information disclosed in this background art section is only for enhancing the understanding of the background art, and thus the information discussed in this background art section does not necessarily constitute the prior art. Summary of the Invention

[0005] Aspects of some embodiments of the present disclosure include a secondary battery capable of reducing the temperature of components with locally increased temperature.

[0006] However, the features according to the embodiments of the present disclosure are not limited to the above features, and other features not described will be clearly understood by those skilled in the art from the following description.

[0007] A secondary battery according to some embodiments of the present disclosure includes: an electrode assembly; a case including an inner space accommodating the electrode assembly; a cover plate configured to seal the case; a first electrode part electrically connected to the electrode assembly and fixed to the cover plate; a second electrode part spaced apart from the first electrode part, electrically connected to the electrode assembly and fixed to the cover plate; and a heat dissipation part located between the electrode assembly and the cover plate and in contact with at least one of the first electrode part and the second electrode part to increase the heat dissipation area.

[0008] According to some embodiments, the first electrode part may include: a first connection part located below the cover plate, electrically connected to the electrode assembly, and in contact with the heat dissipation part; and a first terminal part having one side in contact with the first connection part and the other side extending to the outside of the cover plate.

[0009] According to some embodiments, the first connection part may include: a first core member, spaced apart from the electrode assembly and installed between the electrode assembly and the cover plate; and a first side member, extending from both sides of the first core member to contact the electrode assembly and electrically connected to the electrode assembly.

[0010] According to some embodiments, the heat dissipation part may be in surface contact with the upper side of the first side member to increase the heat dissipation area.

[0011] According to some embodiments, the lower side of the heat dissipation part may contact the first side member, and the upper side of the heat dissipation part may contact the inner side of the cover plate.

[0012] According to some embodiments, the heat dissipation part may be in surface contact with the lower side of the first core member to increase the heat dissipation area.

[0013] According to some embodiments, the second electrode part may include: a second connection part, located below the cover plate, electrically connected to the electrode assembly and in contact with the heat dissipation part; and a second terminal part, having one side in contact with the second connection part and the other side extending to the outside of the cover plate.

[0014] According to some embodiments, the second connection part may include: a second core member, spaced apart from the electrode assembly and installed between the electrode assembly and the cover plate; and a second side member, extending from both sides of the second core member to contact the electrode assembly and electrically connected to the electrode assembly.

[0015] According to some embodiments, the heat dissipation part may be in surface contact with the upper side of the second side member to increase the heat dissipation area.

[0016] According to some embodiments, the lower side of the heat dissipation part may contact the second side member, and the upper side of the heat dissipation part may contact the inner side of the cover plate.

[0017] According to some embodiments, the heat dissipation part may be in surface contact with the lower side of the second core member to increase the heat dissipation area.

[0018] According to some embodiments, the heat dissipation part may include at least one of a thermal interface material (TIM), graphite, a polyester film, a ceramic, and a metal composite material.

[0019] According to some embodiments, the first electrode part and the second electrode part may be fixed to both sides of the cover plate in the length direction, and the heat dissipation part may be in surface contact with the cover assembly.

[0020] A secondary battery according to some embodiments of the present disclosure includes: an electrode assembly including a first electrode tab and a second electrode tab mounted in opposite directions; a case including an internal space for accommodating the electrode assembly; a first current collector located between the case and the electrode assembly and between the cover plate and the electrode assembly and electrically connected to the first electrode tab; a second current collector positioned in a direction opposite to the first current collector and electrically connected to the second electrode tab; a first terminal portion fixed to the cover plate and electrically connected to the first current collector; a second terminal portion fixed to the cover plate and electrically connected to the second current collector; a first heat dissipation portion mounted at least at one of between the first current collector and the case and between the first current collector and the cover plate and configured to transfer heat of the first current collector to the case; and a second heat dissipation portion mounted at least at one of between the second current collector and the case and between the second current collector and the cover plate and configured to transfer heat of the second current collector to the case.

[0021] A secondary battery according to some embodiments of the present disclosure includes: an electrode assembly including a first electrode tab and a second electrode tab mounted in opposite directions; a case including an internal space for accommodating the electrode assembly; a first current collector located between a cover plate configured to seal the case and the electrode assembly and electrically connected to the first electrode tab; a second current collector positioned in a direction opposite to the first current collector and electrically connected to the second electrode tab; a first terminal portion fixed to the cover plate and electrically connected to the first current collector; a second terminal portion fixed to the cover plate and electrically connected to the second current collector; and a heat dissipation portion mounted between the electrode assembly and the case and configured to transfer heat generated in the electrode assembly to the case.

[0022] A secondary battery according to some embodiments of the present disclosure includes: an electrode assembly including a first electrode tab and a second electrode tab arranged in opposite directions; a case including an internal space for accommodating the electrode assembly; a cover plate configured to seal the case; a first electrode portion electrically connected to the first electrode tab and fixed to the case; a second electrode portion electrically connected to the second electrode tab and fixed to the case; and a heat dissipation portion located inside the case and in contact with at least one of the first electrode portion, the second electrode portion, and the electrode assembly to increase a heat dissipation area.

[0023] According to some embodiments, the first electrode portion may include: a first core member spaced apart from the electrode assembly and mounted between the electrode assembly and the case; first side members extending from both sides of the first core member, connected to the first electrode tab and electrically connected to the electrode assembly; and a first terminal portion having one side in contact with the first core member and the other side extending to the outside of the case.

[0024] According to some embodiments, the second electrode part may include: a second core member spaced apart from the electrode assembly and installed between the electrode assembly and the housing; second side members extending from both sides of the second core member, connected to the second electrode tab and electrically connected to the electrode assembly; and a second terminal part having one side in contact with the second core member and the other side extending to the outside of the housing.

[0025] According to some embodiments, the heat dissipation part may include: a first heat dissipation part installed while being in contact with the first side member and the housing; and a second heat dissipation part installed while being in contact with the second side member and the housing.

[0026] According to some embodiments, the heat dissipation part may include: a third heat dissipation part installed between the first core member and the electrode assembly; and a fourth heat dissipation part installed between the second core member and the electrode assembly. Description of the Drawings

[0027] The drawings attached to this specification show aspects of some embodiments of the present disclosure and, together with the detailed description of the present disclosure provided below, are used to help further understand the embodiments according to the present disclosure. Therefore, the embodiments according to the present disclosure should not be construed as being limited to the content described in the drawings.

[0028] Figure 1 is a perspective view of a secondary battery according to some embodiments of the present disclosure.

[0029] Figure 2 is a perspective view showing the installation state of the heat dissipation part according to some embodiments of the present disclosure.

[0030] Figure 3 is a front view showing the installation state of the heat dissipation part according to some embodiments of the present disclosure.

[0031] Figure 4 is a front view showing the installation state of the heat dissipation part according to some embodiments of the present disclosure.

[0032] Figure 5 is a front view showing the installation state of the heat dissipation part according to some embodiments of the present disclosure.

[0033] Figure 6 is a front view of a secondary battery according to some embodiments of the present disclosure.

[0034] Figure 7 is a front view showing the installation state of the heat dissipation part according to some embodiments of the present disclosure.

[0035] Figure 8 is a front view showing the installation state of the heat dissipation part according to some embodiments of the present disclosure.

[0036] Figure 9is a front view showing a secondary battery according to some embodiments of the present disclosure.

[0037] Figure 10 is a front view showing an installation state of a heat dissipation unit according to some embodiments of the present disclosure.

[0038] Figure 11 is a front view showing an installation state of a heat dissipation unit according to some embodiments of the present disclosure. Detailed Description

[0039] Hereinafter, aspects of some embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical concept of the present disclosure in accordance with the principle that the inventor can appropriately define the concept of terms in order to best explain their own invention. Therefore, it should be understood that various equivalents and modification examples capable of substituting those embodiments and configurations may exist at the time of filing this application.

[0040] In addition, when the term "comprising" or "including" and / or its variants are used in this specification, it is stated that there are the stated features, quantities, steps, operations, components, elements, and / or groups thereof, but does not exclude the presence or addition of one or more other features, quantities, steps, operations, components, elements, and / or groups thereof.

[0041] Furthermore, to assist in understanding the invention, the drawings are not drawn to actual scale and may exaggerate the dimensions of some components. In addition, the same reference numerals may be given to the same components in different embodiments.

[0042] When two compared objects are said to be the same, this means that the two objects are "substantially the same". Therefore, substantially the same may include deviations considered to be low in the art, for example, deviations less than 5%. In addition, when a parameter is said to be uniform in a certain region, this may mean that the parameter is uniform from an average perspective.

[0043] Although various components are described using "first", "second", etc., these components are of course not limited by these terms. These terms are only used to distinguish one component from other components, and unless otherwise stated, the first component may be referred to as the second component.

[0044] Throughout the specification, unless otherwise specifically stated, each component may be single or multiple.

[0045] When any element is referred to as being “above (or below)” or “on (or under)” a component, this can mean not only that the any element is positioned in contact with the upper (or lower) surface of the component, but also that other elements can be disposed between the component and the any element that is on (or under) the component.

[0046] In addition, it will be understood that when a component is referred to as being “on,” “connected to,” or “coupled to” another component, these components can be directly connected or directly coupled to each other, but other components can be “disposed” between the components, or the components can be “connected” or “coupled” through another component.

[0047] As used herein, the term “and / or” includes any combination and all combinations of one or more of the associated listed items. In addition, when describing embodiments of the present disclosure, the use of “may” refers to “one or more embodiments of the present disclosure.” Expressions such as “one or more (s / ers),” “at least one (s / ers)” before / after a list of elements modify the entire list of elements, rather than individual elements in the list.

[0048] Throughout the specification, unless otherwise specifically stated, when using “A and / or B,” it means A, B, or A and B, and unless otherwise specifically stated, when using “C to D,” it means greater than or equal to C and less than or equal to D.

[0049] When using phrases such as “at least one (s / ers) of A, B, and C,” “at least one (s / ers) of A, B, or C,” “at least one (s / ers) selected from the group consisting of A, B, and C,” or “at least one (s / ers) selected from A, B, and C” to detail a list of elements A, B, and C, the phrase can refer to any suitable combination.

[0050] The term “use” can be considered synonymous with the term “utilize.” As used herein, the terms “substantially,” “about,” and similar terms are used as approximate terms and not as terms of degree, and are intended to account for the inherent deviations of measured or calculated values that would be recognized by a person of ordinary skill in the art.

[0051] Although the terms “first,” “second,” “third,” etc. may be used herein to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or section from another. Thus, a first element, first component, first region, first layer, or first section discussed below may be referred to as a second element, second component, second region, second layer, or second section without departing from the spirit and scope of the disclosed embodiments.

[0052] For ease of description, spatial relative terms such as “below,” “beneath,” “lower,” “above,” “upper,” etc. may be used herein to describe the relationship of one element or feature to another (other) element or feature as shown in the figures. It will be understood that the spatial relative terms are also intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, when the device in the figures is turned over, an element described as “below” or “beneath” other elements is understood to be oriented “above” the other elements. Thus, the term “below” can encompass both an upper and a lower orientation.

[0053] The terms used herein are for the purpose of describing embodiments of the present disclosure and are not intended to limit the present disclosure.

[0054] A secondary battery 100 according to some embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0055] Figure 1 is a perspective view of a secondary battery 100 according to some embodiments of the present disclosure, Figure 2 is a perspective view showing an installation state of a heat dissipation part 200 according to some embodiments of the present disclosure, Figure 3 is a front view showing an installation state of a heat dissipation part 200 according to some embodiments of the present disclosure.

[0056] As Figures 1 to 3 shown, a secondary battery 100 according to some embodiments of the present disclosure includes an electrode assembly 110, a first electrode part 120, a second electrode part 150, a housing 180, and a heat dissipation part 200. In addition, the secondary battery 100 may further include a safety vent 190.

[0057] During high-output discharge or rapid charging of the secondary battery 100, a high current is applied to the battery cell, so the temperature locally rises at the terminals of the electrode assembly 110, etc. The temperature locally rises at the connection part between the electrode assembly 110 and the first electrode part 120 and the second electrode part 150, and the heat dissipation part 200 is installed inside the housing 180 to reduce the temperature.

[0058] Since the heat dissipation unit 200 is installed inside the housing 180 and is in contact with the portion where the heat locally increases at the same time, the heat in the region where the temperature locally rises can be released to a lower temperature region or the outside.

[0059] The electrode assembly 110 can be formed by winding or stacking a stack of a first electrode plate, a separator, and a second electrode plate that are formed in a thin plate shape or a thin film shape. When the electrode assembly 110 is a wound stack, the winding axis can be parallel to the length direction Y of the housing 180. Additionally, the electrode assembly 110 can be of a stacked type instead of a wound type, and the shape of the electrode assembly 110 is not limited in the present disclosure. Additionally, the electrode assembly 110 can be a Z-stacked electrode assembly 110 in which a positive electrode plate and a negative electrode plate are inserted on both sides of a separator bent in a Z shape. Additionally, one or more electrode assemblies 110 can be stacked in such a way that their long sides are adjacent to each other, and can be accommodated inside a housing 182 provided in the housing 180, and the number of electrode assemblies 110 is not limited in the present disclosure. The first electrode plate of the electrode assembly 110 can be used as a negative electrode, and the second electrode plate of the electrode assembly 110 can be used as a positive electrode. Of course, the opposite case is also possible.

[0060] The electrode tabs of the electrode assembly 110 according to some embodiments are all mounted in the same direction. In an example, the electrode tabs of the electrode assembly 110 are mounted toward the upper side (based on Figure 3 ) of the electrode assembly 110 where the lid assembly 185 is mounted, and are respectively electrically connected to a first connection portion 130 and a second connection portion 160 that will be described in more detail below.

[0061] The first electrode plate can be formed by coating a first electrode active material such as graphite or carbon on a first electrode current collector plate formed of a metal foil such as copper, copper alloy, nickel, or nickel alloy.

[0062] The second electrode plate can be formed by coating a second electrode active material such as a transition metal oxide on a second electrode current collector plate formed of a metal foil such as aluminum or aluminum alloy. The electrode assembly 110 can be accommodated in the housing 180 together with an electrolyte.

[0063] According to some embodiments, the separator can be located between the first electrode plate and the second electrode plate to prevent or reduce short-circuit situations and enable lithium ions to move, and can include a polyethylene, polypropylene, or composite film of polyethylene and polypropylene. Additionally, the separator can be replaced with an inorganic solid electrolyte (such as a sulfide-based electrolyte, an oxide-based electrolyte, or a phosphate-based electrolyte) that does not require a liquid electrolyte or a gel electrolyte.

[0064] According to some embodiments, the electrolyte may include a lithium salt (such as LiPF 6 or LiBF 4 ) in an organic solvent (such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), or dimethyl carbonate (DMC)). Additionally, the electrolyte may be liquid or gel. According to some embodiments, when an inorganic solid electrolyte is used, the liquid or gel electrolyte may be omitted.

[0065] Within the technical concept of electrically connecting the first electrode part 120 to the electrode assembly 110 and fixing the first electrode part 120 to the housing 180, the first electrode part 120 may be modified into various shapes. The first electrode part 120 according to some embodiments of the present disclosure includes a first connection part 130 and a first terminal part 140. Additionally, the first electrode part 120 may be mounted on a cover plate 186 provided in the housing 180.

[0066] Within the technical concept of positioning the first connection part 130 inside the housing 180, electrically connecting the first connection part 130 to the electrode assembly 110, and bringing the first connection part 130 into contact with the heat dissipation part 200, the first connection part 130 may be modified into various shapes. The first connection part 130 may electrically connect the electrode of the electrode assembly 110 to the first terminal part 140.

[0067] In an example, the first connection part 130 may include a first core member 132 spaced apart from the electrode assembly 110 and mounted between the electrode assembly 110 and the housing 180, and first side members 134 extending from both sides of the first core member 132 to contact and electrically connect to the electrode assembly 110.

[0068] The first core member 132 is mounted while being spaced apart from the electrode assembly 110. The first core member 132 has a plate shape and is electrically connected to a first terminal post 142 provided in the first terminal part 140. Additionally, the first core member 132 may be located between the electrode assembly 110 and the cover plate 186. Optionally, the first core member 132 may also be located between the electrode assembly 110 and the housing 182.

[0069] The first side members 134 are located on both sides of the first core member 132 in the length direction Y. The first side members 134 extend in the length direction Y of the electrode assembly 110 and are electrically connected to the electrode assembly 110. The first side members 134 are mounted while being in contact with the electrode assembly 110.

[0070] Since both sides of the first core member 132 are formed to be inclined toward the first side members 134, the first side members 134 are connected to both sides of the first core member 132.

[0071] The first terminal portion 140 can be modified into various shapes within the technical concept of bringing one side into contact with the first connection portion 130 and extending the other side to the outside of the cover plate 186 provided in the housing 180. According to some embodiments, the first terminal portion 140 may include a first terminal post 142 and a first terminal plate 144.

[0072] According to some embodiments, the first terminal post 142 may pass through the cover plate 186 of the cover assembly 185 to protrude and extend upward by a predetermined length, and may be electrically connected to the first core member 132 of the first connection portion 130 at the lower side of the cover plate 186. According to some embodiments, the first terminal post 142 may be made of copper, a copper alloy, aluminum, or an aluminum alloy.

[0073] The first terminal plate 144 has a hole to which the first terminal post 142 may be coupled, riveted, and / or welded. According to some embodiments, the surface of the first terminal post 142 exposed upward may be welded to the facing surface of the first terminal plate 144. For example, a laser beam is applied to the boundary region of the first terminal post 142 exposed upward and the boundary region of the first terminal plate 144 such that the boundary regions may be welded to each other by melting and then cooled. According to some embodiments, the first terminal post 142 and the first terminal plate 144 may be electrically insulated from the cover plate 186.

[0074] Within the technical concept of spacing the second electrode portion 150 apart from the first electrode portion 120, electrically connecting the second electrode portion 150 to the electrode assembly 110, and fixing the second electrode portion 150 to the housing 180, the second electrode portion 150 can be modified into various shapes. The second electrode portion 150 according to some embodiments of the present disclosure includes a second connection portion 160 and a second terminal portion 170. Additionally, the second electrode portion 150 may be mounted on the cover plate 186 provided in the housing 180.

[0075] Within the technical concept of positioning the second connection portion 160 inside the housing 180, electrically connecting the second connection portion 160 to the electrode assembly 110, and bringing the second connection portion 160 into contact with the heat dissipation portion 200, the second connection portion 160 can be modified into various shapes.

[0076] The second connection portion 160 may electrically connect the electrodes of the electrode assembly 110 to the second terminal portion 170. The second connection portion 160 may be mounted between the cover plate 186 and the electrode assembly 110. When the cover plate 186 is located above the electrode assembly 110, the second connection portion 160 may be located above the electrode assembly 110 and below the cover plate 186.

[0077] In the example, the second connection part 160 may include a second core member 162 that is spaced apart from the electrode assembly 110 and installed between the electrode assembly 110 and the cover plate 186, and second side members 164 that extend from both sides of the second core member 162 to contact the electrode assembly 110 and are electrically connected to the electrode assembly 110.

[0078] The second core member 162 is installed while being spaced apart from the electrode assembly 110. The second core member 162 has a plate shape and is electrically connected to a second terminal post 172 provided in the second terminal part 170.

[0079] The second side members 164 are located on both sides of the second core member 162 in the length direction Y. The second side members 164 extend in the length direction Y of the electrode assembly 110 and are electrically connected to the electrode assembly 110. The second side members 164 are installed while being in contact with the electrode assembly 110.

[0080] Since both sides of the second core member 162 are formed to be inclined toward the second side members 164, the second side members 164 are connected to both sides of the second core member 162.

[0081] The second terminal part 170 may be modified into various shapes within the technical concept of making one side contact the second connection part 160 and making the other side extend to the outside of the cover plate 186. According to some embodiments, the second terminal part 170 may include a second terminal post 172 and a second terminal plate 174.

[0082] According to some embodiments, the second terminal post 172 may pass through the cover plate 186 of the cover assembly 185 to protrude and extend upward by a predetermined length, and may be electrically connected to the second core member 162 of the second connection part 160 at the lower side of the cover plate 186. According to some embodiments, the second terminal post 172 may be made of copper, a copper alloy, aluminum, or an aluminum alloy.

[0083] The second terminal plate 174 has a hole, and the second terminal post 172 may be coupled, riveted, and / or welded to the hole. According to some embodiments, the surface of the second terminal post 172 exposed upward may be welded to the facing surface of the second terminal plate 174. For example, a laser beam is applied to the boundary region of the second terminal post 172 exposed upward and the boundary region of the second terminal plate 174, so that the boundary regions may be welded to each other by melting and then cooled. According to some embodiments, the second terminal post 172 and the second terminal plate 174 may be electrically insulated from the cover plate 186.

[0084] Within the technical concept that the housing 180 includes an internal space accommodating the electrode assembly 110, the housing 180 may be modified into various shapes. The housing 180 according to some embodiments of the present disclosure includes a housing body 182 and a cover assembly 185.

[0085] Within the technical concept where the housing 182 houses the electrode assembly 110 and includes an open inlet, the housing 182 can be modified into various shapes. The housing 182 can have a generally rectangular parallelepiped shape with a hollow portion therein and an opening at its upper part. The electrode assembly 110 can be inserted into the housing 182 through the opening. The housing 182 can include a rectangular bottom surface and four side surfaces that extend approximately vertically from the four sides of the bottom surface. Additionally, the housing 182 can be modified into various shapes including a cylindrical shape.

[0086] Within the technical concept where the cover assembly 185 blocks the inlet of the housing 182 and is fixed to the housing 182, the cover assembly 185 can be modified into various shapes. In an example, the first electrode portion 120 and the second electrode portion 150 are fixed to the cover assembly 185, and the heat dissipation portion 200 can be in contact with the surface of the cover assembly 185. In an example, the cover assembly 185 can include a cover plate 186 and a stopper 188.

[0087] The cover plate 186 seals the opening of the housing 182 and can be formed of the same material as the housing 182. For example, although not limited, the cover plate 186 can be joined to the housing 182 by a laser welding method. The cover plate 186 can further include an electrolyte injection hole and an exhaust hole 187 that passes through from its upper surface to its lower surface.

[0088] The stopper 188 can seal the electrolyte injection hole after the electrolyte is injected into the outer case 180 through the electrolyte injection hole of the cover plate 186.

[0089] The safety vent 190 is installed at a position facing the exhaust hole 187 of the cover plate 186 and can be opened under a set pressure.

[0090] The heat dissipation portion 200 is located inside the outer case 180 provided in the secondary battery 100 and can be in contact with at least one of the first electrode portion 120 and the second electrode portion 150 to increase the heat dissipation area. The heat dissipation portion 200 can be located between the cover plate 186 and the electrode assembly 110.

[0091] In an example, within the technical concept of attaching a component with a large heat mass to a component with high heat generation to disperse the rapidly increasing heat to other areas, the heat dissipation portion 200 can be modified into various shapes. The heat dissipation portion 200 can be installed at each of the first connection portion 130 and the second connection portion 160, which are components with high heat generation. Since the heat dissipation portion 200 is installed while being in contact with the outer case 180 having a large heat dissipation area, the heat generated in the first connection portion 130 and the second connection portion 160 can be released to the outside.

[0092] The heat dissipation part 200 is attached to at least one of the first connection part 130 and the second connection part 160 to provide a heat dissipation function. Since the heat dissipation part 200 is installed while being in contact with at least one of the housing 182 and the cover assembly 185, the heat dissipation part 200 can cause heat exchange with the air outside the outer shell 180. The heat dissipation part 200 is made of a heat-conductive material.

[0093] In an example, the heat dissipation part 200 can be made of at least one of a thermal interface material (TIM), graphite, polyester film, ceramic material, and metal composite material.

[0094] The thermal interface material is made of heat-conductive rubber or silicon and effectively transfers the heat of the secondary battery 100. The thermal interface material generally has a flexible property and transfers heat.

[0095] Graphite is a material with excellent thermal conductivity and can be used for the heat dissipation part 200. Graphite effectively transfers heat and can operate stably even in a high-temperature environment.

[0096] The polyester film is a film with a medium level of thermal conductivity.

[0097] The ceramic material is a heat-resistant material and can effectively transfer heat and operate stably even at high temperatures.

[0098] The metal composite material is a combination of a metal and other materials and is used to relatively improve the thermal conductivity and can include metals such as aluminum and copper.

[0099] In addition, a composite material in which a thermal interface material and graphite are mixed can be used. In addition, a composite material in which a thermal interface material and a metal including aluminum or copper are mixed can be used.

[0100] In an example, the heat dissipation part 200 can include at least one of a silicon-based material, a composite material of a combination of silicon and graphite, and a composite material of a combination of silicon and a metal.

[0101] Silicon is a material with high thermal conductivity and can be used to effectively transfer heat when used in the heat dissipation part 200. Silicon generally has a flexible property and can transfer heat.

[0102] The composite material of a combination of silicon and graphite has high thermal conductivity and thus transfers heat quickly. Graphite effectively transfers heat, and silicon transfers heat by making the material flexible and filling the micro-asperities on the surface of the material, which helps to effectively disperse heat.

[0103] A composite material as a combination of silicon and a metal is obtained by combining silicon and a metal (e.g., aluminum or copper) in a predetermined ratio, and the metal has high thermal conductivity and can effectively transfer heat by combining with silicon. The composite material as a combination of silicon and a metal can dissipate heat quickly and relatively improve the thermal stability of the heat dissipation part 200.

[0104] The heat dissipation part 200 can use a material with a large heat capacity. The term "heat capacity" is a term representing the ability to store or absorb heat, and represents the physical property of a material that responds to heat or stores and quickly releases heat. A material with a large heat capacity can efficiently absorb and store heat, and thus can be effectively used to reduce thermal variations and stabilize the temperature. In an example, the heat dissipation part 200 can be any one of mica, a composite material including mica and graphite, a composite material including mica and a metal, and a composite material including mica and a thermal interface material.

[0105] Mica is used as an insulating material and has low thermal conductivity but a large heat capacity, so it is effective in storing heat and then releasing heat. Mica helps to mitigate temperature variations and relatively improve stability. Mica is an insulating material that well blocks heat and electricity and is used in many heat-related applications.

[0106] A composite material including mica and graphite can relatively improve thermal conductivity while maintaining the heat capacity of mica. Graphite can quickly transfer and store heat, so it helps with effective heat distribution and thermal stability.

[0107] In a composite material obtained by combining mica and a metal (e.g., aluminum or copper), the thermal conductivity of the metal is increased while maintaining the heat capacity property of mica, which not only helps to effectively store and distribute heat, but also relatively improves thermal stability.

[0108] A composite material including mica and a thermal interface material (TIM) is used to effectively store heat while quickly transferring heat. The thermal interface material (TIM) can relatively improve thermochemical properties and thermodynamic properties and optimize thermal management.

[0109] Materials with a large heat capacity and corresponding composite materials play an important role in improving thermal stability and reducing thermal variations in the field of thermal management applications. Therefore, using a material with a large heat capacity as the material of the heat dissipation part 200 helps to improve safety and optimize or improve the performance of the secondary battery 100.

[0110] In addition, when insulation is required, the heat dissipation part 200 can include a plurality of insulating layers and a plurality of heat dissipation layers. The insulating layer can include at least one of mica, a thermal interface material (TIM), ceramics, and silicon.

[0111] In addition, an insulating adhesive layer can be further provided in the heat dissipation part 200. Double-sided tapes, adhesives, etc. can be used for the insulating adhesive layer. Additionally, metals such as aluminum and copper can be used for the heat dissipation layer, and graphite or metal composites can also be used for the heat dissipation layer.

[0112] The electrode tabs of the positive electrode and the negative electrode are located above the electrode assembly 110, and the electrode tabs are electrically connected to the first electrode part 120 and the second electrode part 150 respectively. Therefore, the first side member 134 and the second side member 164 are located below the cover assembly 185, and the heat dissipation part 200 can be installed while being in contact with each of the first side member 134 and the second side member 164.

[0113] In an example, the heat dissipation part 200 can be in surface contact with the upper side of the first side member 134 to increase the heat dissipation area. The lower side of the heat dissipation part 200 can be in contact with the first side member 134, and the upper side of the heat dissipation part 200 can be in contact with the inner side of the housing 180. In an example, the upper side of the heat dissipation part 200 can be in contact with the cover plate 186 to increase the heat dissipation area.

[0114] In addition, the heat dissipation part 200 can be in surface contact with the upper side of the second side member 164 to increase the heat dissipation area. The lower side of the heat dissipation part 200 can be in contact with the second side member 164, and the upper side of the heat dissipation part 200 can be in contact with the inner side of the housing 180.

[0115] The heat dissipation part 200 according to some embodiments of the present disclosure is formed in a cuboid shape, and its lower surface or the whole thereof can be set to be insulated. Therefore, the electrical connection between the first side member 134 and the second side member 164 can be prevented or reduced. Since the upper side of the heat dissipation part 200 is in contact with the cover plate 186, the heat generated in the first side member 134 and the second side member 164 can be guided to the outside of the cover plate 186.

[0116] When an external short circuit and thermal runaway occur during the use of the secondary battery 100, the first electrode part 120 and the second electrode part 150 may overheat, which may cause deformation (warpage) of the electrode assembly 110. Therefore, by installing the heat dissipation part 200 at each of the first electrode part 120 and the second electrode part 150, the overheating of the first electrode part 120 and the second electrode part 150 can be prevented or reduced, thereby relatively improving the safety of the secondary battery 100.

[0117] In addition, the heat dissipation part 200 presses each of the first side member 134 and the second side member 164 in the direction towards the electrode assembly 110, thereby being able to prevent or reduce the phenomenon that the first side member 134 and the second side member 164 are spaced apart from the electrode assembly 110 due to external impacts, vibrations, etc.

[0118] The lower side of the heat dissipation part 200 is formed of an insulating layer, and the upper side of the heat dissipation part 200 can be modified into various forms, such as using a composite material in which an insulating layer or a thermal interface material is mixed with a metal including aluminum or copper.

[0119] Figure 4 is a front view showing the installation state of the heat dissipation part 210 according to some embodiments of the present disclosure. As Figure 4 shown, the heat dissipation part 210 according to some embodiments can be in surface contact with the upper side of the first side member 134 to increase the heat dissipation area. The heat dissipation part 210 can also be in surface contact with the upper side of the second side member 164 to increase the heat dissipation area.

[0120] The heat dissipation part 210 can be installed on both the first side member 134 and the second side member 164, and if necessary, the heat dissipation part 210 can be installed on only one of the first side member 134 and the second side member 164. In addition, since the upper side of the heat dissipation part 210 is installed while being in contact with the cover plate 186, the first side member 134 and the second side member 164 can be pressed in the direction toward the electrode assembly 110. At least one of the upper surface and the lower surface of the heat dissipation part 210 can be formed of an insulating layer.

[0121] Figure 5 is a front view showing the installation state of the heat dissipation part 220 according to some embodiments of the present disclosure. As Figure 5 shown, the heat dissipation part 220 according to some embodiments of the present disclosure can be in surface contact with the lower side of the first core member 132 to increase the heat dissipation area. The heat dissipation part 220 can also be in surface contact with the lower side of the second core member 162 to increase the heat dissipation area.

[0122] The heat dissipation part 220 is formed in a plate shape and includes a material the same as or similar to that of the heat dissipation part 200 in the embodiments described above, for example. Figures 1 to 3 The heat dissipation part 220 can be installed on both the first core member 132 and the second core member 162, and if necessary, it can be installed on only one of the first core member 132 and the second core member 162. The heat dissipation part 220 can be installed while being in contact with each of the first core member 132 and the electrode assembly 110. In addition, the heat dissipation part 200 can be installed while being in contact with each of the second core member 162 and the electrode assembly 110.

[0123] Figure 6 is a front view showing a secondary battery 300 according to some embodiments of the present disclosure. As Figure 6As shown, a secondary battery 300 according to some embodiments of the present disclosure includes an electrode assembly 310, a first current collector 320, a second current collector 340, a first terminal portion 330, a second terminal portion 350, a housing 180, a first heat dissipation portion 400, and a second heat dissipation portion 410.

[0124] The electrode assembly 310 includes a first electrode tab 311 and a second electrode tab 312 mounted in opposite directions. The first electrode tab 311 is located on the first side (left side based on Figure 6 ) in the length direction Y of the electrode assembly 310, and the second electrode tab 312 is located on the second side (right side based on Figure 6 ) in the length direction Y of the electrode assembly 310.

[0125] Within the technical concept that the housing 180 includes an internal space for accommodating the electrode assembly 310, the housing 180 can be modified into various shapes. In an example, the housing 180 may include a housing 182 that accommodates the electrode assembly 310 and includes an open entrance, and a cover assembly 185 that blocks the entrance of the housing 182 and is fixed to the housing 182. The housing 180 is the same or similar to the housing 180 in the embodiments described above, for example, regarding Figures 1 to 3 and thus some of its detailed descriptions may be omitted.

[0126] Within the technical concept of positioning the first current collector 320 between the housing 180 and the electrode assembly 310 and electrically connecting the first current collector 320 to the first electrode tab 311, the first current collector 320 can be modified into various shapes. The first current collector 320 electrically connects the first electrode tab 311 to the first terminal portion 330 provided on the cover plate 186.

[0127] According to some embodiments, the first current collector 320 may contact the first electrode tab 311 protruding from one end of the electrode assembly 310. In fact, the first current collector 320 may be welded to the first electrode tab 311. According to some embodiments, the first current collector 320 may be formed in a substantially "┎" shape, and a terminal hole may be formed in the upper portion of the first current collector 320. According to some embodiments, the first terminal post 332 may be inserted into the terminal hole and riveted and / or welded to the terminal hole. According to some embodiments, the first current collector 320 may be made of copper or a copper alloy.

[0128] Within the technical concept of fixing the first terminal portion 330 to the cover plate 186 of the housing 180 and electrically connecting the first terminal portion 330 to the first current collector 320, the first terminal portion 330 can be modified into various shapes. The first terminal portion 330 includes a first terminal post 332 and a first terminal plate 334. The first terminal portion 330 is the same as that in the embodiments described above, for example, regarding Figures 1 to 3The first terminal portion 140 in the described embodiments is the same or similar, and thus some of its detailed descriptions may be omitted.

[0129] Within the technical concept of positioning the second current collector portion 340 in a direction opposite to the first current collector portion 320 and electrically connecting the second current collector portion 340 to the second electrode tab 312, the second current collector portion 340 can be modified into various shapes. The second current collector portion 340 can contact the second electrode tab 312 protruding from the other end of the electrode assembly 310. According to some embodiments, the second current collector portion 340 can be formed in a substantially "┎" shape, and a terminal hole can be formed in the upper portion of the second current collector portion 340. According to some embodiments, the second terminal post 352 is inserted into the terminal hole and coupled to the terminal hole. For example, the second current collector portion 340 can be made of, but not limited to, aluminum or an aluminum alloy. The second terminal post 352 can pass through a cover plate 186, which will be described below, to protrude and extend upward by a predetermined length, and can be electrically connected to the second current collector portion 340 at the lower side of the cover plate 186.

[0130] Within the technical concept of fixing the second terminal portion 350 to the cover plate 186 of the housing 180 and electrically connecting the second terminal portion 350 to the second current collector portion 340, the second terminal portion 350 can be modified into various shapes. The second terminal portion 350 includes a second terminal post 352 and a second terminal plate 354. The second terminal portion 350 is the same or similar to the second terminal portion 170 in the embodiments described above, for example, with reference to Figures 1 to 3 and thus some of its detailed descriptions may be omitted.

[0131] Within the technical concept of mounting the first heat dissipation portion 400 between the first current collector portion 320 and the housing 182 provided in the housing 180 and transferring the heat of the first current collector portion 320 to the housing 182, the first heat dissipation portion 400 can be modified into various shapes. The first heat dissipation portion 400 can be mounted at least at one of between the first current collector portion 320 and the housing 182 and between the first current collector portion 320 and the cover plate 186. The first heat dissipation portion 400 has a rectangular parallelepiped shape extending in the vertical direction Z and is mounted while contacting each of the inner side of the housing 182 and the side surface of the first current collector portion 320. Therefore, the heat generated in the first current collector portion 320 can be cooled through the housing 182.

[0132] Within the technical concept of installing the second heat dissipation part 410 between the second current collector part 340 and the housing 182 provided in the housing 180 and transferring the heat of the second current collector part 340 to the housing 182, the second heat dissipation part 410 can be modified into various shapes. The second heat dissipation part 410 can be installed at least at one of between the second current collector part 340 and the housing 182 and between the second current collector part 340 and the cover plate 186. The second heat dissipation part 410 has a rectangular parallelepiped shape extending in the vertical direction Z, and is installed while contacting each of the inner side of the housing 182 and the side surface of the second current collector part 340. Therefore, the heat generated in the second current collector part 340 can be cooled through the housing 182.

[0133] Figure 7 is a front view showing the installation state of the heat dissipation parts 420 and 430 according to some embodiments of the present disclosure. As Figure 7 shown, within the technical concept of installing the first heat dissipation part 420 between the cover plate 186 and the first current collector part 320 and transferring the heat of the first current collector part 320 to the cover plate 186, the first heat dissipation part 420 according to some embodiments of the present disclosure can be modified into various shapes. The first heat dissipation part 420 has a rectangular parallelepiped shape extending in the length direction Y, and is installed while contacting each of the lower side of the cover plate 186 and the upper surface of the first current collector part 320. Therefore, the heat generated in the first current collector part 320 can be cooled through the cover plate 186.

[0134] Within the technical concept of installing the second heat dissipation part 430 between the cover plate 186 and the second current collector part 340 and transferring the heat of the second current collector part 340 to the cover plate 186, the second heat dissipation part 430 according to some embodiments of the present disclosure can be modified into various shapes. The second heat dissipation part 430 has a rectangular parallelepiped shape extending in the length direction Y, and is installed while contacting each of the lower side of the cover plate 186 and the upper surface of the second current collector part 340. Therefore, the heat generated in the second current collector part 340 can be cooled through the cover plate 186.

[0135] Figure 8 is a front view showing the installation state of the heat dissipation part 440 according to some embodiments of the present disclosure. As Figure 8 shown, within the technical concept of installing the heat dissipation part 440 between the electrode assembly 310 and the housing 182 provided in the housing 180 and transferring the heat generated in the electrode assembly 310 to the bottom surface of the housing 182, the heat dissipation part 440 according to some embodiments of the present disclosure can be modified into various shapes. The heat dissipation part 440 extends in the length direction Y, and is installed while contacting each of the lower side of the housing 182 and the lower side of the electrode assembly 310.

[0136] The electrode assembly 310 may include a first electrode tab 311 and a second electrode tab 312 installed in opposite directions. Heat generated in the electrode assembly 310 may be transferred to the lower side of the case 182 through the heat dissipation part 440 and dissipated.

[0137] Figure 9 FIG. 5 is a front view showing a secondary battery 500 according to some embodiments of the present disclosure. Figure 9 As shown in , the secondary battery 500 may include an electrode assembly 310 , a first electrode part 510 , a second electrode part 540 , a housing 180 , and a heat dissipation part 600 .

[0138] The electrode assembly 310 may be modified into various shapes within the technical concept that the electrode assembly 310 includes the first electrode tab 311 and the second electrode tab 312 installed in opposite directions. In addition, the outer case 180 includes an inner space in which the electrode assembly 310 is accommodated.

[0139] The housing 180 and the electrode assembly 310 are similar to those described above. Figure 6 The described housing 180 and electrode assembly 310 are the same or similar, and thus some detailed descriptions thereof may be omitted.

[0140] The first electrode portion 510 may be modified into various shapes within the technical concept of electrically connecting the first electrode portion 510 to the first electrode tab 311 and fixing the first electrode portion 510 to the housing 180 . The first electrode portion 510 includes a first connection portion 520 and a first terminal portion 530 .

[0141] The first connection portion 520 may include a first core member 522 that is spaced apart from the electrode assembly 310 and installed between the electrode assembly 310 and the case 180, and a first side member 524 that extends from both sides of the first core member 522 to be connected to the first electrode tab 311 and electrically connected to the electrode assembly 310. The first core member 522 and the first side member 524 are similar to the above description of Figures 1 to 3 The first core member 132 and the first side member 134 of the described embodiment are similar or identical, so some detailed descriptions thereof may be omitted. The first side member 524 extends in the vertical direction Z and is electrically connected to the first electrode tab 311 of the electrode assembly 310. The first core member 522 protrudes to one side toward the housing 180 in the length direction Y and is electrically connected to the first terminal portion 530.

[0142] The first terminal portion 530 can be modified into various shapes within the technical concept of bringing one side into contact with the first core member 522 and extending the other side to the outside of the housing 180. The first terminal portion 530 includes a first terminal post 532 electrically connected to the first core member 522 and a first terminal plate 534 mounted in a shape surrounding the periphery of the first terminal post 532. The first terminal portion 530 is fixed to one side of the housing 180 in the longitudinal direction Y.

[0143] Within the technical concept of electrically connecting the second electrode portion 540 to the second electrode tab 312 and fixing the second electrode portion 540 to the housing 180, the second electrode portion 540 can be modified into various shapes. The second electrode portion 540 includes a second connection portion 550 and a second terminal portion 560.

[0144] The second connection portion 550 includes a second core member 552 spaced apart from the electrode assembly 310 and mounted between the electrode assembly 310 and the housing 180. Second side members 554 extend from both sides of the second core member 552 to connect to the second electrode tab 312 and are electrically connected to the electrode assembly 310. The second core member 552 and the second side members 554 are similar or identical to the second core member 162 and the second side members 164 described above, for example, with respect to the present disclosure, Figures 1 to 3 and thus some of their detailed descriptions may be omitted. The second side members 554 extend in the vertical direction Z and are electrically connected to the second electrode tab 312 of the electrode assembly 310. The second core member 552 protrudes toward the housing 180 on the other side in the longitudinal direction Y and is electrically connected to the second terminal portion 560.

[0145] The second terminal portion 560 can be modified into various shapes within the technical concept of bringing one side into contact with the second core member 552 and extending the other side to the outside of the housing 180. The second terminal portion 560 includes a second terminal post 562 electrically connected to the second core member 552 and a second terminal plate 564 mounted in a shape surrounding the periphery of the second terminal post 562. The second terminal portion 560 is fixed to one side of the housing 180 in the longitudinal direction.

[0146] Within the technical concept of positioning the heat dissipation portion 600 inside the housing 180 and increasing the heat dissipation area while bringing the heat dissipation portion 600 into contact with at least one of the first electrode portion 510, the second electrode portion 540, and the electrode assembly 310, the heat dissipation portion 600 can be modified into various shapes. The heat dissipation portion 600 according to some embodiments of the present disclosure may include a first heat dissipation portion 610 mounted while being in contact with the first side member 524 and the housing 180, and a second heat dissipation portion 620 mounted while being in contact with the second side member 554 and the housing 180.

[0147] The first heat dissipation part 610 extends in the vertical direction Z and is located between the first side member 524 and a side surface of the outer shell 180. The first heat dissipation part 610 is installed while being in contact with the side surface of the housing 182, and this side surface is located on one side of the housing 182 in the length direction Y (based on Figure 9 the left side). The heat generated in the first side member 524 is transferred to the outer shell 180 through the first heat dissipation part 610 and dissipated.

[0148] The second heat dissipation part 620 extends in the vertical direction Z and is positioned between the second side member 554 and the other side surface of the outer shell 180. The second heat dissipation part 620 is installed while being in contact with the side surface of the housing 182, and this side surface is located on the other side of the housing 182 in the length direction Y (based on Figure 9 the right side). The heat generated in the second side member 554 is transferred to the outer shell 180 through the second heat dissipation part 620 and dissipated.

[0149] Figure 10 is a front view showing the installation state of the heat dissipation parts 630 and 640 according to some embodiments of the present disclosure. As Figure 10 shown, the heat dissipation parts 630 and 640 according to some embodiments of the present disclosure may include a third heat dissipation part 630 installed between the first core member 522 and the electrode assembly 310 and a fourth heat dissipation part 640 installed between the second core member 552 and the electrode assembly 310.

[0150] The third heat dissipation part 630 extends in the vertical direction Z and is installed while being in contact with one end of each of the first core member 522 and the electrode assembly 310. The increased heat dissipation area through the third heat dissipation part 630 can prevent or reduce the deterioration of the durability of the secondary battery 500 due to overheating caused by the heat generated in the first core member 522.

[0151] The fourth heat dissipation part 640 extends in the vertical direction Z and is installed while being in contact with one end of each of the second core member 552 and the electrode assembly 310. The increased heat dissipation area through the fourth heat dissipation part 640 can prevent or reduce the deterioration of the durability of the secondary battery 500 due to overheating caused by the heat generated in the second core member 552.

[0152] Figure 11 is a front view showing the installation state of a heat dissipation part (for example, the fifth heat dissipation part 650) according to some embodiments of the present disclosure. As Figure 11As shown in [description], a fifth heat dissipation part 650, which is a heat dissipation part according to some embodiments of the present disclosure, is installed between the electrode assembly 310 and the housing 180. Within the technical concept of installing the fifth heat dissipation part 650 between the electrode assembly 310 and the housing 180 and transferring the heat generated in the electrode assembly 310 to the housing 180, the fifth heat dissipation part 650 can be modified into various shapes. The fifth heat dissipation part 650 extends in the longitudinal direction Y and is installed while being in contact with each of the lower side of the housing 182 and the lower side of the electrode assembly 310.

[0153] According to some embodiments of the present disclosure, the temperature of a component with a locally increased temperature can be reduced, so that high output or fast charging can be stably achieved.

[0154] In addition, the heat generated inside the housing of the secondary battery can be quickly guided to the outside of the housing, thereby relatively improving the safety of the secondary battery.

[0155] However, the effects obtained through the present disclosure are not limited to the above effects, and those skilled in the art can clearly understand other technical effects not described from the above description of the invention.

[0156] The embodiments according to the present disclosure are not limited to the above embodiments. As claimed in the appended claims and their equivalents, the features of the embodiments according to the present disclosure include the scope in which those skilled in the art can make various changes without departing from the spirit and scope of the embodiments according to the present disclosure.

Claims

1. A secondary battery, comprising: Electrode assembly; a housing, comprising an inner space containing the electrode assembly; a cover plate configured to seal the housing; a first electrode portion electrically connected to the electrode assembly and fixed to the cap plate; a second electrode portion, spaced apart from the first electrode portion, electrically connected to the electrode assembly, and fixed to the cap plate; as well as The heat dissipation portion is between the electrode assembly and the cover plate and contacts at least one of the first electrode portion and the second electrode portion.

2. The secondary battery according to claim 1, wherein The first electrode portion comprises: a first connection portion, which is below the cap plate and electrically connected to the electrode assembly and in contact with the heat dissipation portion; and The first terminal portion has one side in contact with the first connection portion and the other side extending to the outside of the cap plate.

3. The secondary battery according to claim 2, wherein: The first connecting portion comprises: a first core member spaced apart from the electrode assembly and installed between the electrode assembly and the cap plate; and A first side member extends from both sides of the first core member to contact the electrode assembly and is electrically connected to the electrode assembly.

4. The secondary battery according to claim 3, wherein The heat dissipation portion makes surface contact with an upper side of the first side member.

5. The secondary battery according to claim 4, wherein The lower side of the heat dissipation portion contacts the first side member, and The upper side of the heat dissipation portion contacts the inner side of the cover plate.

6. The secondary battery according to claim 3, wherein The heat dissipating portion makes surface contact with the lower side of the first core member.

7. The secondary battery according to claim 1, wherein The second electrode portion includes: a second connection portion under the cap plate and electrically connected to the electrode assembly and in contact with the heat dissipation portion; and The second terminal portion has one side in contact with the second connection portion and the other side extending to the outside of the cap plate.

8. The secondary battery according to claim 7, wherein The second connecting portion comprises: a second core member spaced apart from the electrode assembly and installed between the electrode assembly and the cap plate; and A second side member extends from both sides of the second core member to contact the electrode assembly and is electrically connected to the electrode assembly.

9. The secondary battery according to claim 8, wherein The heat dissipation portion makes surface contact with an upper side of the second side member to increase a heat dissipation area.

10. The secondary battery according to claim 9, wherein The lower side of the heat dissipation portion contacts the second side member, and The upper side of the heat dissipation portion contacts the inner side of the cover plate.

11. The secondary battery according to claim 8, wherein The heat dissipating portion makes surface contact with the lower side of the second core member.

12. The secondary battery according to claim 1, wherein The heat dissipation portion includes at least one of a thermal interface material, graphite, a polyester film, a ceramic, and a metal composite material.

13. The secondary battery according to claim 1, wherein The first electrode portion and the second electrode portion are fixed to both sides of the cover plate in the length direction, and The heat dissipation portion contacts the surface of the cover assembly.

14. A secondary battery, comprising: An electrode assembly including a first electrode terminal tab and a second electrode terminal tab installed in opposite directions; a housing, comprising an inner space containing the electrode assembly; a cover plate configured to seal the housing; a first current collecting portion between the case and the electrode assembly and between the cap plate and the electrode assembly and electrically connected to the first electrode tab; a second current collecting portion positioned in an opposite direction to the first current collecting portion and electrically connected to the second electrode tab; a first terminal portion fixed to the cap plate and electrically connected to the first current collecting portion; a second terminal portion fixed to the cap plate and electrically connected to the second current collecting portion; a first heat dissipation portion installed at least one of between the first header and the housing and between the first header and the cover plate, and configured to transfer heat from the first header to the housing; as well as The second heat dissipation portion is installed at least one of between the second header and the housing and between the second header and the cover plate, and is configured to transfer heat of the second header to the housing.

15. The secondary battery according to claim 14, wherein The heat dissipation portion includes at least one of a thermal interface material, graphite, a polyester film, a ceramic, and a metal composite material.

16. A secondary battery, comprising: An electrode assembly including a first electrode terminal tab and a second electrode terminal tab installed in opposite directions; a housing, comprising an inner space containing the electrode assembly; a cover plate configured to seal the housing; a first current collecting portion between the case and the electrode assembly and between the cap plate and the electrode assembly and electrically connected to the first electrode tab; a second current collecting portion positioned in an opposite direction to the first current collecting portion and electrically connected to the second electrode tab; a first terminal portion fixed to the cap plate and electrically connected to the first current collecting portion; a second terminal portion fixed to the cap plate and electrically connected to the second current collecting portion; as well as The heat dissipation portion is between the electrode assembly and the case and is configured to transfer heat generated in the electrode assembly to the case.

17. A secondary battery, comprising: An electrode assembly including a first electrode terminal tab and a second electrode terminal tab installed in opposite directions; a housing, comprising an inner space containing the electrode assembly; a cover plate configured to seal the housing; a first electrode portion electrically connected to the first electrode tab and fixed to the housing; a second electrode portion electrically connected to the second electrode tab and fixed to the housing; as well as The heat dissipation portion is inside the housing and contacts at least one of the first electrode portion, the second electrode portion, and the electrode assembly.

18. The secondary battery according to claim 17, wherein The first electrode portion comprises: a first core member spaced apart from the electrode assembly and mounted between the electrode assembly and the case; first side members extending from both sides of the first core member, connected to the first electrode tab, and electrically connected to the electrode assembly; and a first terminal portion having one side in contact with the first core member and the other side extending to the outside of the housing, and The second electrode portion includes: a second core member spaced apart from the electrode assembly and mounted between the electrode assembly and the case; second side members extending from both sides of the second core member, connected to the second electrode tab, and electrically connected to the electrode assembly; and The second terminal portion has one side in contact with the second core member and the other side extending to the outside of the housing.

19. The secondary battery according to claim 18, wherein The heat dissipation unit comprises: a first heat dissipation portion installed while being in contact with the first side member and the housing; and The second heat dissipation portion is installed while being in contact with the second side member and the housing.

20. The secondary battery according to claim 18, wherein The heat dissipation unit comprises: a third heat dissipation portion between the first core member and the electrode assembly; and The fourth heat dissipation portion is between the second core member and the electrode assembly.

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