Secondary batteries

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 their potential for 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] The electrode assembly 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 incorporated into an aluminum laminate sheet pouch-type battery case have attracted much attention due to their low manufacturing cost, light weight, easy form deformation, etc., and their usage is gradually increasing.

[0007] Looking at the structure of a pouch cell, the pouch exterior and the lead are bound together by a seal, creating a relatively strong structure. In contrast, the internal electrode and lead are bound together by welding between the tabs attached to the electrode and the lead. However, with technological advancements, the tabs are becoming thinner and the number of stacks of mono-cells is increasing for higher capacities. As a result, the durability of the connection point between the tabs that support the electrode body and the lead against vibrations, shocks, and other environmental factors may gradually weaken.

[0008] In other words, because there was no other support structure and the main body was supported only by tab welding between the electrode and the lead, there was a limit to its durability against vibrations and shocks in the operating environment. [Overview of the project] [Problems that the invention aims to solve]

[0009] One aspect of the present invention provides a secondary battery that can firmly support an electrode assembly against operating environments such as vibration and shock.

[0010] Another aspect of the present invention is to provide a secondary battery capable of effective internal temperature control. [Means for solving the problem]

[0011] An embodiment of the present invention may include an electrode assembly in which electrodes and a separator membrane are alternately stacked, a pouch that houses the electrode assembly, a plurality of electrode leads connected to both sides of the electrode assembly and extending to the outside of the pouch, and a support base that connects the plurality of electrode leads within the pouch.

[0012] Furthermore, the battery pack according to the embodiment of the present invention may include a secondary battery according to the embodiment of the present invention. [Effects of the Invention]

[0013] According to the present invention, since a support base is included to support the electrode assembly, the electrode assembly can be firmly supported against the operating environment, such as vibration and shock, thereby enhancing its durability. In this case, both ends of the support base are connected to multiple electrode leads, respectively, allowing for even more robust support of the electrode assembly.

[0014] Furthermore, the support base can transfer heat generated from the electrode assembly to the electrode leads, and the surrounding area can be cooled by heat dissipation through the electrode leads.

[0015] Furthermore, a refrigerant is contained within the support base, allowing for cooling of the surrounding area. The support base is also equipped with a temperature sensor to detect the ambient temperature, enabling effective internal temperature control. [Brief explanation of the drawing]

[0016] [Figure 1] This is a plan view showing a secondary battery according to the first embodiment of the present invention. [Figure 2] This is a plan view illustrating the internal structure of a secondary battery according to a first embodiment of the present invention. [Figure 3] This is a side cross-sectional view of a main part showing a secondary battery according to the first embodiment of the present invention. [Figure 4] This is a perspective view showing a support stand for a secondary battery according to a first embodiment of the present invention. [Figure 5] This is a plan view showing a support base for a secondary battery and a temperature sensor according to a first embodiment of the present invention. [Figure 6] This is a plan view illustrating the internal structure of a secondary battery according to a second embodiment of the present invention. [Figure 7] This is a side cross-sectional view of a main part showing a secondary battery according to a second embodiment of the present invention. [Figure 8] This is a perspective view showing a support base for a secondary battery according to a second embodiment of the present invention. [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 referring to the components of each drawing in this specification, the same components, as far as possible, have the same reference numerals 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, a detailed description of related known technologies that may obscure the gist of the present invention is 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 illustratively 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 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 inside 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 stacked.

[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 stacked.

[0023] The positive electrode 121 and the negative electrode 122 may be formed in a rectangular plate shape, stacked in one direction, and facing each other via a separation membrane 124.

[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 aluminum foil.

[0026] The positive electrode active material may consist of lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or compounds or mixtures containing one or more of these.

[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 graphite-based material.

[0030] The separation membrane 124 is made of an insulating material and electrically insulates the positive electrode 121 and the negative electrode 122. Here, the separation membrane 124 may be formed of a polyolefin resin membrane such as polyethylene or polypropylene that has microporous properties.

[0031] On the other hand, the electrode assembly 120 may further include electrode tabs 130 provided at the ends of the electrodes 123. Here, if the electrode assembly 120 is provided with multiple electrodes 123, an electrode tab 130 may be provided on each electrode 123.

[0032] 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.

[0033] The pouch 110 has a housing section 111a formed inside, which can house the electrode assembly 120 inside.

[0034] Furthermore, the pouch 110 includes a main body 111 in which a housing portion 111a for housing the electrode assembly 120 is formed, and a sealing portion 112 sealed on the edge of the main body 111.

[0035] The sealing portion 112 may be located on the outer circumferential surface of the secondary battery 100 and formed by thermocompression bonding. Here, the pouch 110 includes an upper case 110a and a lower case 110b, and the sealing portion 112 may be formed by sealing the outer circumferential surfaces of the upper case 110a and the lower case 110b. In this case, the portion of the electrode lead 140 located between the outer circumferential surface of the upper case 110a and the outer circumferential surface of the lower case 110b may be sealed together with the outer circumferential surfaces of the upper case 110a and the lower case 110b. This allows the electrode lead 140 to be fixed to the pouch 110 by the sealing portion 112.

[0036] Furthermore, the pouch 110 may include a flexible material. In this case, the pouch 110 may include a first insulating layer, an aluminum (Al) sheet, and a second insulating layer, which are laminated from the inside out.

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

[0038] The second insulating coating layer may contain 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] Multiple electrode leads 140 are provided and are connected to both sides of the electrode assembly 120, extending outside the pouch and electrically connecting the electrode assembly 120 to the outside. In this case, the multiple electrode leads 140 may be fixed to a seal portion 112 formed on the outer circumferential surface of the pouch 110.

[0040] Here, the multiple 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 of the electrode assembly 120, and the negative electrode lead 142 may extend from the other side of the electrode assembly 120. The positive electrode lead 141 may also be electrically connected to the positive electrode 121 via a positive electrode tab 131, and the negative electrode lead 142 may be electrically connected to the negative electrode 122 via a negative electrode tab 132. Here, the positive electrode tab 131 may be connected to a first portion of the positive electrode lead 141, and the negative electrode tab 132 may be connected to a first portion of the negative electrode lead 142. In this case, the support base 150 may have both ends connected to second portions of the positive electrode lead 141 and the negative electrode lead 142, respectively. Here, the first portion may be located outward relative to the second portion.

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

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

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

[0045] Furthermore, 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 (resin) material. In this case, the heat-dissipating plastic may include, as a specific example, a thermally-conductive plastic. Similarly, the heat-dissipating resin may include, as a specific example, a thermally-conductive resin.

[0046] On the other hand, the support base 150 may include a support portion having a strength of a predetermined level or more so as to enable 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 may include, for example, epoxy resin which has sufficient mechanical strength to support, high thermal conductivity, and is an insulating material, and the coating portion may include, for example, silicon which has chemical resistance and is an insulating material.

[0047] Furthermore, the support base 150 may be formed in a hollow tubular shape. In this case, the support base 150 may be formed in a square tubular shape, for example. This allows the surface that contacts the electrode assembly 120 to form a square contact surface, thereby better supporting the electrode assembly 120.

[0048] Furthermore, one end of the support base 150 may be fixed to the underside of the end of the positive lead 141, and the other end of the support base 150 may be fixed to the underside of the end of the negative 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 stacked between the rectangular plate-shaped positive electrode 121 and the negative electrode 122, which are stacked in one direction. In this case, the support base 150 may, for example, face the positive electrode 121 and the negative electrode 122 via a separator membrane 124. On the other hand, as another example, the support base 150 may be made of an insulating material and face the positive electrode 121 and the negative electrode 122 directly.

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

[0051] On the other hand, the support base 150 can, for example, transfer heat generated from the electrode assembly 120 to the electrode lead 140. That is, it can transfer the high heat generated from the electrode assembly 120 around the support base 150 to the electrode lead 140, and the surrounding area can be cooled by heat dissipation through the electrode lead 140.

[0052] In addition, the support base 150 may, as another example, have a containment space 151 inside which a refrigerant is housed, allowing it to cool the surrounding area. That is, a refrigerant such as cooling water is located inside the support base 150, and the high heat generated from the electrode assembly 120 around the support base 150 can be cooled. In this case, the containment space 151 of the support base 150 may be sealed, or it 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 surrounding area by transferring heat generated from the electrode assembly 120 to the electrode lead 140, and can also directly cool the surrounding area by forming a housing space 151 inside which a coolant is contained.

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

[0055] Referring to Figures 3 and 5, the temperature sensor 160 is mounted 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] Furthermore, 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 in the center of the support base 150. This allows the first temperature sensor 161 and the second temperature sensor 162 to detect the temperature around the electrode tab 130 or electrode lead 140, and the third temperature sensor 163 to detect the temperature at the center of the electrode assembly 120. Thus, temperature monitoring is easy and effective temperature control is possible using the first temperature sensor 161, the second temperature sensor 162, and the third temperature sensor 163.

[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. This allows for firm support of the electrode assembly 120 against vibrations and shocks in the operating environment, thereby enhancing durability. In this case, both ends of the support base 150 are connected to the positive electrode lead 141 and the negative electrode lead 142, respectively, allowing for even more robust support of the electrode assembly 120.

[0058] Furthermore, the support base 150 can transfer heat generated from the electrode assembly 120 to the electrode lead 140, and the surrounding area can be cooled by heat dissipation through the electrode lead 140.

[0059] Furthermore, a refrigerant is contained inside the support base 150, allowing for cooling of the surrounding area. The support base 150 is also equipped with a temperature sensor 160 that detects the ambient temperature, enabling effective internal temperature control.

[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, which is configured as described above.

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

[0062] Secondary battery according to the second embodiment The following describes a secondary battery according to a second embodiment of the present invention.

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

[0064] Referring to Figures 6 to 8, the secondary battery 200 according to the second embodiment of the present invention includes an electrode assembly 120, a pouch 110 housing the electrode assembly 120, a plurality of electrode leads 140 connected to the electrode assembly 120 and extending to the outside of the pouch 110, and a support base 250 connected to the plurality of electrode leads 140 within the pouch. The secondary battery 200 according to the second embodiment of the present invention may further include a temperature sensor for detecting temperature.

[0065] The secondary battery 200 according to the second embodiment of the present invention differs from the secondary battery according to the first embodiment described above in the form of the support base 250. Therefore, this embodiment will omit or briefly describe any content that overlaps with the previously described embodiment and will focus on describing the differences.

[0066] More specifically, the electrode assembly 120 is a power generation element capable of charging and discharging, and may include alternately stacked electrodes 123 and a separator membrane 124.

[0067] The electrode 123 may consist of a positive electrode 121 and a negative electrode 122. In this case, the electrode assembly 120 may have a structure in which the positive electrode 121 / separation membrane 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, stacked in one direction, and facing each other via a separation membrane 124.

[0069] On the other hand, the electrode assembly 120 may further include electrode tabs 130 provided at the ends of the electrodes 123. Here, if the electrode assembly 120 is provided with multiple electrodes 123, an electrode tab 130 may be provided on 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 a housing section 111a formed inside, which can house the electrode assembly 120 inside.

[0072] Furthermore, the pouch 110 includes a main body 111 in which a housing portion 111a for housing the electrode assembly 120 is formed, and a sealing portion 112 sealed on the edge of the main body 111.

[0073] The sealing portion 112 may be located on the outer circumferential 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 sealing portion 112 may be formed by sealing the outer circumferential surfaces of the upper case 110a and the lower case 110b. In this case, the portion of the electrode lead 140 located between the outer circumferential surface of the upper case 110a and the outer circumferential surface of the lower case 110b may be sealed together with the outer circumferential surfaces of the upper case 110a and the lower case 110b. This allows the electrode lead 140 to be fixed to the pouch 110 by the sealing portion 112.

[0074] Furthermore, the pouch 110 may include flexible materials. In this case, the pouch 110 may include a first insulating layer, an aluminum (Al) sheet, and a second insulating layer, which are laminated from the inside out.

[0075] Multiple electrode leads 140 are provided and are connected to both sides of the electrode assembly 120, extending outside the pouch and electrically connecting the electrode assembly 120 to the outside. In this case, the multiple electrode leads 140 may be fixed to a seal portion 112 formed on the outer circumferential surface of the pouch 110.

[0076] Here, the multiple 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 of the electrode assembly 120, and the negative electrode lead 142 may extend from the other side of the electrode assembly 120. The positive electrode lead 141 may also be electrically connected to the positive electrode 121 via a positive electrode tab 131, and the negative electrode lead 142 may be electrically connected to the negative electrode 122 via a negative electrode tab 132. Here, the positive electrode tab 131 may be connected to a first portion of the positive electrode lead 141, and the negative electrode tab 132 may be connected to a first portion of the negative electrode lead 142. In this case, the support base 150 may have both ends connected to second portions of the positive electrode lead 141 and the negative electrode lead 142, respectively. Here, the first portion may be located outward relative to the second portion.

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

[0079] The support base 250 is connected at both ends to a plurality of electrode leads 140 within the pouch 110, allowing it to support the electrode assembly 120.

[0080] Furthermore, 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 (resin) material. In this case, the heat-dissipating plastic may, as a specific example, include thermally-conductive plastics. Similarly, the heat-dissipating resin may, as a specific example, include a thermally-conductive resin.

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

[0082] On the other hand, the support base 250 may include a support portion having a strength of a predetermined level or more so as to enable 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 may include, for example, epoxy resin which has sufficient mechanical strength to support, high thermal conductivity, and is an insulating material, and the coating portion may include, for example, silicon which has chemical resistance and is an insulating material.

[0083] Furthermore, the support base 250 may be formed in the shape of a plate. In this case, the support base 250 may be formed in the shape of a rectangular plate, for example. This allows the surface that contacts the electrode assembly 120 to form a rectangular contact surface, thereby better supporting the electrode assembly 120. Here, the support base 250 may have a plurality of through holes 252 formed therein. Here, the through holes 252 may be formed in a manner that penetrates in the stacking direction. This allows lithium ions and the like to move through the through holes 252.

[0084] Furthermore, one end of the support base 250 may be fixed to the underside of the end of the positive lead 141, and the other end of the support base 250 may be fixed to the underside of the end of the negative 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 rectangular plate-shaped positive electrode 121 and the negative electrode 122, which are stacked in one direction. In this case, the support base 250 may, for example, face the positive electrode 121 and the negative electrode 122 via a separator membrane 124. On the other hand, as another example, the support base 250 may be made of an insulating material and face the positive electrode 121 and the negative electrode 122 directly.

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

[0087] On the other hand, the support base 250 can transfer heat generated from the electrode assembly 120 to the electrode lead 140. In other words, it can transfer the high heat generated from the electrode assembly 120 around the support base 250 to the electrode lead 140, and the surrounding area can be cooled by heat dissipation through the electrode lead 140.

[0088] Although the present invention has been described in detail above with reference to specific embodiments, this is for illustrative purposes only and the present invention is not limited thereto. It can be said that various implementations are possible within the technical concept of the present invention by persons with ordinary skill in the art.

[0089] Furthermore, the specific scope of protection of the invention will be clarified by the attached claims. [Explanation of Symbols]

[0090] 100, 200 secondary battery 110 pouches 110a Upper case 110b Lower case 111 Main unit 111a Storage area 112 Seal part 120 Electrode assembly 121 Positive electrode 122 Negative electrode 123 Electrode 124 Separation membrane 130 electrode tabs 131 Positive Tab 132 Negative Electrode Tab 140 electrode leads 141 Positive lead 142 Negative lead 150, 250 support stand 151 Containment 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 separation membranes are alternately stacked, A pouch for housing the electrode assembly inside, Multiple electrode leads connected to both sides of the electrode assembly and extending to the outside of the pouch, It comprises a support base for connecting multiple electrode leads, The electrodes include 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 of the electrode assembly, and the negative electrode lead extends from the other side of the electrode assembly. One end of the support base is fixed to the end of the positive lead, The other end of the support base is fixed to the end of the negative electrode lead. The aforementioned support base has a housing space formed inside in which a refrigerant is contained, and a secondary battery that cools the surrounding area.

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

3. The secondary battery according to claim 1, wherein the support base is formed in the shape of a rectangular tube.

4. An electrode assembly in which electrodes and separation membranes are alternately stacked, A pouch for housing the electrode assembly inside, Multiple electrode leads connected to both sides of the electrode assembly and extending to the outside of the pouch, It comprises a support base for connecting multiple electrode leads, The electrodes include 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 of the electrode assembly, and the negative electrode lead extends from the other side of the electrode assembly. One end of the support base is fixed to the end of the positive lead, The other end of the support base is fixed to the end of the negative electrode lead. The support base is further equipped with a temperature sensor for detecting ambient temperature. The aforementioned temperature sensor is A first temperature sensor and a second temperature sensor are provided at both ends of the support base, A secondary battery, including a third temperature sensor provided in the center of the support base.

5. The secondary battery according to claim 1, wherein the support base passes horizontally through the central side of the electrode assembly to support the electrode assembly.

6. The positive electrode and the negative electrode are formed in the shape of a square plate and stacked in one direction, facing each other with the separation membrane in between. The secondary battery according to claim 1, wherein the support base is located between the positive electrode and the negative electrode.

7. The electrode assembly further includes electrode tabs provided at the ends of the electrodes, The electrode tab includes a positive electrode tab provided at the end of the positive electrode and a negative electrode tab provided at the end of the negative electrode. The positive lead is electrically connected to the positive electrode via the positive tab. The negative electrode lead is electrically connected to the negative electrode via the negative electrode tab. The positive electrode tab is connected to the first portion of the positive electrode lead, and the negative electrode tab is connected to the first portion of the negative electrode lead. The secondary battery according to claim 1, wherein both ends of the support base are connected to the second portion of the positive electrode lead and the negative electrode lead, respectively.

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

9. An electrode assembly in which electrodes and separation membranes are alternately stacked, A pouch for housing the electrode assembly inside, Multiple electrode leads connected to both ends of the electrode assembly and extending outside the pouch, It comprises a support base for connecting multiple electrode leads, The electrodes include 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 of the electrode assembly, and the negative electrode lead extends from the other side of the electrode assembly. One end of the support base is fixed to the end of the positive lead, The other end of the support base is fixed to the end of the negative electrode lead. The support base is formed in a plate shape and has multiple through holes formed therein. A secondary battery in which at least one through hole is formed in the contact surface of the support base with the electrode assembly.

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

11. A battery pack comprising a secondary battery according to any one of claims 1 to 10.

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