Secondary battery

Abstract

The present invention relates to a secondary battery. The secondary battery according to the present invention includes an electrode assembly in which electrodes and a separator are alternately laminated, a pouch that houses the electrode assembly therein, a plurality of electrode leads that are connected to both side portions of the electrode assembly and extend outside the pouch, and a support base that connects the plurality of electrode leads within the pouch.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0082077, filed on July 4, 2022, and all the contents disclosed in the document of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The present invention relates to a secondary battery.

Background Art

[0003] Unlike primary batteries, secondary batteries are rechargeable and have been actively researched and developed in recent years due to the possibility of miniaturization and high capacity. With the technological development and increasing demand for mobile devices, the demand for secondary batteries as an energy source has been rapidly increasing.

[0004] Secondary batteries are classified into coin-type batteries, cylindrical batteries, prismatic batteries, and pouch-type batteries according to the shape of the battery case. Secondary batteries contain an electrode assembly and an electrolyte. In a secondary battery, the electrode assembly mounted inside the battery case is a power generation element capable of charge and discharge, which has a laminated structure of electrodes and a separator.

[0005] Electrode assemblies can be broadly classified into a jelly-roll type in which a separator is interposed between a sheet-shaped positive electrode and a negative electrode coated with an active material and wound, a stack type in which a plurality of positive electrodes and negative electrodes are sequentially laminated with a separator interposed therebetween, and a stack-and-folding type in which unit cells of the stack type are wound with a long separation film.

[0006] In recent years, pouch-type batteries having a structure in which a stack-type or stack / folding-type electrode assembly is built into an aluminum laminate sheet pouch-type battery case have attracted much attention due to their low manufacturing cost, light weight, and easy form deformation, and their usage is gradually increasing.

[0007] Looking at the structure of a pouch cell, the appearance of the pouch and the lead are bound in the form of a seal and are in a relatively strong form. On the other hand, the internal electrode and the lead are bound by welding between the respective tabs attached to the electrode and the lead. However, due to the tabs that gradually become thinner with the development of technology and the number of stacks of mono-cells that increase in high capacity, the durability against the usage environment such as vibration and shock at the connection part between the tab that has supported the main body of the electrode and the lead may gradually become weaker.

[0008] That is, without another support structure, since the main body is supported only by tab welding between the electrode and the lead, there is a durability limit against the usage environment such as vibration and shock.

Summary of the Invention

Problems to be Solved by the Invention

[0009] One aspect of the present invention is to provide a secondary battery capable of firmly supporting an electrode assembly against a usage environment such as vibration and shock.

[0010] Another aspect of the present invention is to provide a secondary battery capable of effective internal temperature management.

Means for Solving the Problems

[0011] The secondary battery according to an embodiment of the present invention may include an electrode assembly in which electrodes and a separator are alternately laminated, a pouch that houses the electrode assembly therein, a plurality of electrode leads connected to both side portions of the electrode assembly and extending outside the pouch, and a support base that connects the plurality of electrode leads in the pouch.

[0012] Also, a battery pack according to an embodiment of the present invention may include the secondary battery according to an embodiment of the present invention.

Effects of the Invention

[0013] According to the present invention, since a support base for supporting the electrode assembly is included, the electrode assembly can be firmly supported against the usage environment such as vibration and impact, thereby enhancing the durability. At this time, both ends of the support base are respectively connected to a plurality of electrode leads, and the electrode assembly can be supported more firmly.

[0014] In addition, the support base can cool the periphery by heat dissipation that transfers the heat generated from the electrode assembly to the electrode leads and transfers the heat to the outside through the electrode leads.

[0015] Furthermore, a refrigerant can be accommodated inside the support base to cool the periphery. The support base is provided with a temperature sensor for detecting the peripheral temperature, enabling effective internal temperature management.

Brief Description of the Drawings

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Modes for Carrying Out the Invention

[0017] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in connection with the accompanying drawings. It should be noted that when attaching reference numerals to the components of each drawing in this specification, as long as they are the same components, they are given the same numerals as much as possible even if they are shown in different drawings. Further, the present invention can be realized in various different forms and is not limited to the embodiments described below. Furthermore, in describing the present invention, detailed descriptions of related known technologies that may obscure the gist of the present invention are omitted.

[0018] Secondary battery according to the first embodiment FIG. 1 is a plan view showing a secondary battery according to a first embodiment of the present invention, FIG. 2 is a plan view exemplarily showing the inside of the secondary battery according to the first embodiment of the present invention in a perspective view, and FIG. 3 is a cross-sectional view of a main part showing the secondary battery according to the first embodiment of the present invention.

[0019] Referring to FIGS. 1 to 3, a secondary battery 100 according to a first embodiment of the present invention includes an electrode assembly 120, a pouch 110 that houses the electrode assembly 120, a plurality of electrode leads 140 that are connected to the electrode assembly 120 and extend outside the pouch 110, and a support base 150 that is connected to the plurality of electrode leads 140 within the pouch.

[0020] Further, the secondary battery 100 according to the first embodiment of the present invention may further include a temperature sensor 160 that detects temperature.

[0021] More specifically, referring to FIG. 3, the electrode assembly 120 is a power generation element capable of charge and discharge, and may include electrodes 123 and a separator 124 that are alternately laminated.

[0022] The electrode 123 may be composed of a positive electrode 121 and a negative electrode 122. At this time, the electrode assembly 120 may have a structure in which the positive electrode 121 / separator 124 / negative electrode 122 are alternately laminated.

[0023] The positive electrode 121 and the negative electrode 122 may be formed in a square plate shape, laminated in one direction, and face each other with the separator 124 interposed therebetween.

[0024] The positive electrode 121 may include a positive electrode current collector and a positive electrode active material laminated on the positive electrode current collector.

[0025] The positive electrode current collector may be made of an aluminum foil.

[0026] The positive electrode active material may be made of lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound or mixture containing one or more of them.

[0027] The negative electrode 122 may include a negative electrode current collector and a negative electrode active material laminated on the negative electrode current collector.

[0028] The negative electrode current collector may be made of, for example, a copper (Cu) foil.

[0029] The negative electrode active material may be a compound or mixture containing a carbonaceous material.

[0030] The separator 124 is made of an insulating material and electrically insulates between the positive electrode 121 and the negative electrode 122. Here, the separator 124 may be formed of a polyolefin resin film such as polyethylene or polypropylene having microporosity.

[0031] On the other hand, the electrode assembly 120 may further include an electrode tab 130 provided at an end of the electrode 123. Here, when a plurality of electrodes 123 are provided in the electrode assembly 120, the electrode tab 130 may be provided for each electrode 123.

[0032] The electrode tab 130 may include a positive electrode tab 131 provided at an end of the positive electrode 121 and a negative electrode tab 132 provided at an end of the negative electrode 122. Here, the positive electrode tab 131 may be provided at one end of the positive electrode 121, and the negative electrode tab 132 may be provided at the other end of the negative electrode 122.

[0033] The pouch 110 has an accommodation portion 111a formed therein and can accommodate the electrode assembly 120 therein.

[0034] Further, the pouch 110 includes a main body 111 in which an accommodation portion 111a for accommodating the electrode assembly 120 is formed, and a seal portion 112 sealed to the edge of the main body 111.

[0035] The seal portion 112 may be formed by thermocompression bonding at a position on the outer peripheral surface of the secondary battery 100. Here, the pouch 110 includes an upper case 110a and a lower case 110b, and the seal portion 112 may be formed by sealing the outer peripheral surfaces of the upper case 110a and the lower case 110b. At this time, a portion of the electrode lead 140 located between the outer peripheral surfaces of the upper case 110a and the lower case 110b may be sealed together with the outer peripheral surfaces of the upper case 110a and the lower case 110b. Thereby, the electrode lead 140 can be fixed to the pouch 110 by the seal portion 112.

[0036] Further, the pouch 110 may include a flexible material. At this time, the pouch 110 may include a first insulating layer, an aluminum (Al) sheet, and a second insulating layer laminated from the inside to the outside.

[0037] The first insulating layer may include an insulating material. Here, the first insulating layer may include a resin material.

[0038] The second insulating coating layer may include an insulating material. Here, the second insulating coating layer may include a nylon layer containing a nylon material and a resin layer containing a resin material.

[0039] A plurality of electrode leads 140 are provided, connected to both side portions of the electrode assembly 120 and extending outside the pouch, and can electrically connect the electrode assembly 120 to the outside. At this time, the plurality of electrode leads 140 may be fixed to a seal portion 112 formed on the outer peripheral surface of the pouch 110.

[0040] Here, the plurality of electrode leads 140 may include a positive electrode lead 141 connected to the positive electrode 121 and a negative electrode lead 142 connected to the negative electrode 122.

[0041] The positive electrode lead 141 may extend from one side portion of the electrode assembly 120, and the negative electrode lead 142 may extend from the other side portion of the electrode assembly 120. Also, the positive electrode lead 141 may be electrically connected to the positive electrode 121 via the positive electrode tab 131, and the negative electrode lead 142 may be electrically connected to the negative electrode 122 via the negative electrode tab 132. Here, the positive electrode tab 131 may be connected to the first portion of the positive electrode lead 141, and the negative electrode tab 132 may be connected to the first portion of the negative electrode lead 142. At this time, both ends of the support base 150 may be respectively connected to the second portions of the positive electrode lead 141 and the negative electrode lead 142. Here, the first portion may be located outside with respect to the second portion.

[0042] Also, the plurality of electrode leads 140 may extend in the longitudinal direction of the pouch 110.

[0043] FIG. 4 is a perspective view showing a support base of the secondary battery according to the first embodiment of the present invention.

[0044] Referring to FIGS. 3 and 4, both ends of the support base 150 can be connected to the plurality of electrode leads 140 within the pouch 110 to support the electrode assembly 120.

[0045] Also, the support base 150 may include a non-conductive material. Here, the support base 150 may include, for example, a heat-dissipating plastic or a heat-dissipating resin material. At this time, the heat-dissipating plastic may include, as a specific example, thermally-conductive plastics. Also, the heat-dissipating resin may include, as a specific example, thermally-conductive resins.

[0046] On the one hand, the support base 150 may include a support portion having a predetermined strength or more so as to enable a support function, and a coating portion coated on the outer surface of the support portion so as not to react with the electrolyte. Here, the support portion has, for example, a mechanical strength capable of providing support, a high thermal conductivity, and includes an epoxy resin which is an insulating material. The coating portion may include, for example, silicon which has chemical resistance and is an insulating material.

[0047] Also, the support base 150 may be formed in a hollow tubular shape. At this time, the support base 150 may be formed, for example, in a square tubular shape. Thereby, a contact surface in contact with the electrode assembly 120 forms a square contact surface, and the electrode assembly 120 can be supported better.

[0048] Furthermore, one end portion of the support base 150 may be fixed below the end portion of the positive electrode lead 141, and the other end portion of the support base 150 may be fixed below the end portion of the negative electrode lead 142.

[0049] Furthermore, the support base 150 may be located between the positive electrode 121 and the negative electrode 122. That is, the support base 150 may be laminated between the square plate-shaped positive electrode 121 and negative electrode 122 laminated in one direction. At this time, as an example, the support base 150 may face the positive electrode 121 and the negative electrode 122 via the separator 124. On the other hand, as another example, the support base 150 may be made of an insulating material and directly face the positive electrode 121 and the negative electrode 122.

[0050] Furthermore, the support base 150 may penetrate the central side of the electrode assembly 120. At this time, the support base 150 may penetrate the central side with respect to the stacking direction of the electrode assembly 120. That is, for example, when the electrodes 123 and the separator 124 are alternately stacked in the vertical direction, the support base 150 can pass through the electrode assembly 120 in the horizontal direction to support the electrode assembly 120.

[0051] On the one hand, the support base 150 can, for example, transfer the heat generated from the electrode assembly 120 to the electrode lead 140. That is, the high heat generated from the portion of the electrode assembly 120 around the support base 150 can be transferred to the electrode lead 140, and the periphery can be cooled by heat dissipation that transfers the heat to the outside through the electrode lead 140.

[0052] Also, as another example, the support base 150 has a housing space 151 in which a refrigerant is housed, and can cool the periphery. That is, a refrigerant such as cooling water is located inside the support base 150, and the high heat generated from the portion of the electrode assembly 120 around the support base 150 can be cooled. At this time, the housing space 151 of the support base 150 may be sealed or may be connected to a cooling water supply line located outside the pouch.

[0053] Furthermore, as yet another example, the support base 150 can indirectly cool the periphery by transferring the heat generated from the electrode assembly 120 to the electrode lead 140, and can directly cool the periphery by forming a housing space 151 in which a refrigerant is housed inside.

[0054] FIG. 5 is a plan view showing a support base and a temperature sensor of a secondary battery according to the first embodiment of the present invention.

[0055] Referring to FIGS. 3 and 5, the temperature sensor 160 is provided on the support base 150 and can detect the ambient temperature. Here, the temperature sensor 160 may be located, for example, on the outer surface of the support base 150.

[0056] Further, the temperature sensor 160 may include a first temperature sensor 161 and a second temperature sensor 162 provided at both ends of the support base 150, and a third temperature sensor 163 provided at the center of the support base 150. Thereby, the first temperature sensor 161 and the second temperature sensor 162 can detect the temperature around the electrode tab 130 or the electrode lead 140, and the third temperature sensor 163 can detect the temperature at the center position of the electrode assembly 120. Therefore, temperature monitoring is facilitated by the first temperature sensor 161, the second temperature sensor 162, and the third temperature sensor 163, and effective temperature management is possible.

[0057] The secondary battery 100 according to the first embodiment of the present invention configured as described above includes a support base 150 that supports the electrode assembly 120, so that the electrode assembly 120 can be firmly supported against the use environment such as vibration and impact. As a result, there is an effect that the durability is enhanced. At this time, both ends of the support base 150 are respectively connected to the positive electrode lead 141 and the negative electrode lead 142, and the electrode assembly 120 can be supported more firmly.

[0058] Further, the support base 150 can transfer the heat generated from the electrode assembly 120 to the electrode lead 140 and cool the periphery by dissipating the heat to the outside through the electrode lead 140.

[0059] Furthermore, a refrigerant can be accommodated inside the support base 150 to cool the periphery. The support base 150 is provided with a temperature sensor 160 for detecting the ambient temperature, and effective internal temperature management is possible.

[0060] On the other hand, a battery pack can be configured including the secondary battery 100 according to the first embodiment of the present invention configured as described above.

[0061] Here, the battery pack may include the secondary battery 100 and a pack case that houses the secondary battery 100 inside. Further, the battery pack can be housed in the pack case as a cell stack in which a plurality of secondary batteries 100 are stacked.

[0062] Secondary battery according to the second embodiment Hereinafter, a secondary battery according to a second embodiment of the present invention will be described.

[0063] FIG. 6 is a plan view exemplarily showing the interior of a secondary battery according to a second embodiment of the present invention in a perspective view, FIG. 7 is a cross-sectional view of a main part showing the secondary battery according to a second embodiment of the present invention, and FIG. 8 is a perspective view showing a support base of the secondary battery according to a second embodiment of the present invention.

[0064] Referring to FIGS. 6 to 8, a secondary battery 200 according to a second embodiment of the present invention includes an electrode assembly 120, a pouch 110 that houses the electrode assembly 120, a plurality of electrode leads 140 that are connected to the electrode assembly 120 and extend outside the pouch 110, and a support base 250 that is connected to the plurality of electrode leads 140 within the pouch. Further, the secondary battery 200 according to a second embodiment of the present invention may further include a temperature sensor that detects temperature.

[0065] The secondary battery 200 according to the second embodiment of the present invention has a difference in the form of the support base 250 as compared with the secondary battery according to the aforementioned first embodiment. Therefore, in this embodiment, the contents overlapping with the aforementioned embodiment will be omitted or briefly described, and the description will focus on the differences.

[0066] More specifically, the electrode assembly 120 is a power generation element capable of charge and discharge, and may include electrodes 123 and a separator 124 that are alternately stacked.

[0067] The electrode 123 may be composed of a positive electrode 121 and a negative electrode 122. At this time, the electrode assembly 120 may have a structure in which the positive electrode 121 / separator 124 / negative electrode 122 are alternately stacked.

[0068] The positive electrode 121 and the negative electrode 122 may be formed in a rectangular plate shape and stacked in one direction, and face each other via the separator 124.

[0069] On the other hand, the electrode assembly 120 may further include an electrode tab 130 provided at the end of the electrode 123. Here, when the electrode assembly 120 is provided with a plurality of electrodes 123, the electrode tab 130 may be provided for each electrode 123.

[0070] The electrode tab 130 may include a positive electrode tab 131 provided at the end of the positive electrode 121 and a negative electrode tab 132 provided at the end of the negative electrode 122. Here, the positive electrode tab 131 may be provided at one end of the positive electrode 121, and the negative electrode tab 132 may be provided at the other end of the negative electrode 122.

[0071] The pouch 110 has an accommodation portion 111a formed therein and can accommodate the electrode assembly 120 therein.

[0072] Further, the pouch 110 includes a main body 111 in which an accommodation portion 111a for accommodating the electrode assembly 120 is formed, and a seal portion 112 sealed to the edge of the main body 111.

[0073] The seal portion 112 may be located on the outer peripheral surface of the secondary battery 200 and formed by thermocompression bonding. Here, the pouch 110 includes an upper case 110a and a lower case 110b, and the seal portion 112 may be formed by sealing the outer peripheral surfaces of the upper case 110a and the lower case 110b. At this time, a portion of the electrode lead 140 located between the outer peripheral surfaces of the upper case 110a and the lower case 110b may be sealed together with the outer peripheral surfaces of the upper case 110a and the lower case 110b. Thereby, the electrode lead 140 can be fixed to the pouch 110 by the seal portion 112.

[0074] Further, the pouch 110 may include a flexible material. At this time, the pouch 110 may include a first insulating layer, an aluminum (Al) sheet, and a second insulating layer laminated from the inside to the outside.

[0075] A plurality of electrode leads 140 are provided, connected to both side portions of the electrode assembly 120, extending to the outside of the pouch, and capable of electrically connecting the electrode assembly 120 to the outside. At this time, the plurality of electrode leads 140 may be fixed to the seal portion 112 formed on the outer peripheral surface of the pouch 110.

[0076] Here, the plurality of electrode leads 140 may include a positive electrode lead 141 connected to the positive electrode 121 and a negative electrode lead 142 connected to the negative electrode 122.

[0077] The positive electrode lead 141 may extend from one side portion of the electrode assembly 120, and the negative electrode lead 142 may extend from the other side portion of the electrode assembly 120. Also, the positive electrode lead 141 may be electrically connected to the positive electrode 121 via the positive electrode tab 131, and the negative electrode lead 142 may be electrically connected to the negative electrode 122 via the negative electrode tab 132. Here, the positive electrode tab 131 may be connected to the first portion of the positive electrode lead 141, and the negative electrode tab 132 may be connected to the first portion of the negative electrode lead 142. At this time, the support base 150 may have both ends connected to the second portions of the positive electrode lead 141 and the negative electrode lead 142, respectively. Here, the first portion may be located outside the second portion.

[0078] Also, the plurality of electrode leads 140 may extend in the longitudinal direction of the pouch 110.

[0079] The support base 250 can support the electrode assembly 120 with both ends connected to the plurality of electrode leads 140 within the pouch 110.

[0080] Also, the support base 250 may include a non-conductive material. Here, the support base 250 may include, for example, a heat-dissipating plastic or a heat-dissipating resin material. At this time, the heat-dissipating plastic may include, as a specific example, thermally-conductive plastics. Also, the heat-dissipating resin may include, as a specific example, thermally-conductive resins.

[0081] Furthermore, the support base may include a non-combustible material.

[0082] On the one hand, the support base 250 may include a support portion having a predetermined strength or more so as to enable a support function, and a coating portion coated on the outer surface of the support portion so as not to react with the electrolyte. Here, the support portion has, for example, a mechanical strength capable of providing support, a high thermal conductivity, and contains an epoxy resin which is an insulating material. The coating portion may contain, for example, silicon which has chemical resistance and is an insulating material.

[0083] Also, the support base 250 may be formed in a plate shape. At this time, the support base 250 may be formed, for example, in a square plate shape. Thereby, the surface in contact with the electrode assembly 120 forms a square contact surface, and the electrode assembly 120 can be supported better. Here, a plurality of through holes 252 may be formed in the support base 250. Here, the through holes 252 may be formed in a form penetrating in the stacking direction. Thereby, lithium ions and the like can move through the through holes 252.

[0084] Furthermore, one end portion of the support base 250 may be fixed below the end portion of the positive electrode lead 141, and the other end portion of the support base 250 may be fixed below the end portion of the negative electrode lead 142.

[0085] Furthermore, the support base 250 may be located between the positive electrode 121 and the negative electrode 122. That is, the support base 250 may be stacked between the square plate-shaped positive electrode 121 and negative electrode 122 stacked in one direction. At this time, the support base 250 may face the positive electrode 121 and the negative electrode 122 through the separator 124 as an example. On the one hand, as another example, the support base 250 may be made of an insulating material and directly face the positive electrode 121 and the negative electrode 122.

[0086] Furthermore, the support base 250 may penetrate the central side of the electrode assembly 120. At this time, the support base 250 may penetrate the central side with respect to the stacking direction of the electrode assembly 120. That is, for example, when the electrodes 123 and the separator membranes 124 are alternately stacked in the vertical direction, the support base 250 can pass through the electrode assembly 120 in the horizontal direction to support the electrode assembly 120.

[0087] On the other hand, the support base 250 can transfer the heat generated from the electrode assembly 120 to the electrode lead 140. That is, the high heat generated from the portion of the electrode assembly 120 around the support base 250 is transferred to the electrode lead 140, and the periphery can be cooled by heat dissipation that transfers the heat to the outside through the electrode lead 140.

[0088] As described above, the present invention has been described in detail with specific embodiments, which are for specifically describing the present invention, and the present invention is not limited thereto. It can be said that various implementations are possible by those having ordinary knowledge in the art within the technical idea of the present invention.

[0089] Also, the specific protection scope of the invention will be clarified by the appended claims.

Explanation of Reference Numerals

[0090] 100, 200 Secondary battery 110 Pouch 110a Upper case 110b Lower case 111 Body 111a Accommodating portion 112 Sealing portion 120 Electrode assembly 121 Positive electrode 122 Negative electrode 123 Electrode 124 Separator membrane 130 Electrode tab 131 Positive electrode tab 132 Negative electrode tab 140 Electrode lead 141 Positive electrode lead 142 Negative electrode lead 150, 250 Support base 151 Accommodation space 160 Temperature sensor 161 First temperature sensor 162 Second temperature sensor 163 Third temperature sensor 252 Through hole

Claims

1. An electrode assembly in which electrodes and a separator are alternately laminated, a pouch that houses the electrode assembly therein, a plurality of electrode leads connected to both side portions of the electrode assembly and extending outside the pouch, and a support base that connects the plurality of electrode leads. A secondary battery.

2. The secondary battery according to claim 1, wherein the support base includes a non-conductive material.

3. The secondary battery according to claim 1, wherein the support base has an accommodation space formed therein for accommodating a refrigerant and cools the periphery.

4. The secondary battery according to claim 3, wherein the support base is formed in a square tubular shape.

5. The secondary battery according to claim 1, further comprising a temperature sensor that detects the ambient temperature on the support base.

6. The temperature sensor includes a first temperature sensor and a second temperature sensor provided at both ends of the support base, and a third temperature sensor provided at the central portion of the support base. The secondary battery according to claim 5.

7. The secondary battery according to claim 1, wherein the support base penetrates the electrode assembly.

8. The electrode includes a positive electrode and a negative electrode, the plurality of electrode leads include a positive electrode lead connected to the positive electrode and a negative electrode lead connected to the negative electrode, the positive electrode lead extends from one side portion of the electrode assembly, the negative electrode lead extends from the other side portion of the electrode assembly, and both ends of the support base are respectively connected to the positive electrode lead and the negative electrode lead. The secondary battery according to claim 1.

9. One end of the support base is fixed below the end of the positive electrode lead, and the other end of the support base is fixed below the end of the negative electrode lead. The secondary battery according to claim 8.

10. The positive electrode and the negative electrode are formed in a square plate shape and laminated in one direction, face each other through the separator, and the support base is located between the positive electrode and the negative electrode. The secondary battery according to claim 8.

11. The electrode assembly further includes an electrode tab provided at an end of the electrode, the electrode tab includes a positive electrode tab provided at an end of the positive electrode and a negative electrode tab provided at an end of the negative electrode, the positive electrode lead is electrically connected to the positive electrode through the positive electrode tab, the negative electrode lead is electrically connected to the negative electrode through the negative electrode tab, the positive electrode tab is connected to a first portion of the positive electrode lead, and the negative electrode tab is connected to a first portion of the negative electrode lead. The secondary battery according to claim 8, wherein both ends of the support base are respectively connected to the second portions of the positive electrode lead and the negative electrode lead.

12. The plurality of electrode leads are fixed to a seal portion formed on the outer peripheral surface of the pouch, The secondary battery according to claim 1, wherein both ends of the support base are connected to the plurality of electrode leads to support the electrode assembly.

13. The secondary battery according to claim 1, wherein the support base is formed in a plate shape.

14. The secondary battery according to claim 13, wherein a plurality of through holes are formed in the support base.

15. The secondary battery according to claim 1, wherein the support base is connected to the plurality of electrode leads within the pouch.

16. A battery pack including the secondary battery according to any one of claims 1 to 15.

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