Secondary battery

Abstract

The present disclosure relates to a secondary battery, and the secondary battery according to the present disclosure comprises: an electrode assembly in which electrodes and separators are alternately stacked; a soft package in which the electrode assembly is accommodated; the plurality of electrode leads are respectively connected with the two side parts of the electrode assembly and extend to the outer part of the soft package; and a support portion configured to connect the plurality of electrode leads.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0082077, filed on Jul. 4, 2022, which is hereby incorporated by reference in its entirety. Technical Field

[0004] The present disclosure relates to a secondary battery. Background Art

[0005] Unlike primary batteries, secondary batteries are rechargeable. In addition, compact size and high capacity are possible. Therefore, recently, many studies on secondary batteries are being conducted. With the development of technology and the increase in demand for mobile devices, the demand for secondary batteries as energy sources is rapidly increasing.

[0006] According to the shape of the battery case, rechargeable batteries are classified into button-type batteries, cylindrical batteries, square batteries, and soft-pack batteries. Secondary batteries contain electrode assemblies and electrolytes. In such secondary batteries, the electrode assembly installed in the battery case is a chargeable and dischargeable power generation device having a structure of stacked electrodes and separators.

[0007] Electrode assemblies can be roughly classified into: a wound electrode assembly, in which a separator is inserted between the positive electrode and the negative electrode, each of the positive electrode and the negative electrode is provided in the form of a sheet coated with an active material, and then the positive electrode, the separator and the negative electrode are wound; a stacked electrode assembly, in which a plurality of positive electrodes and negative electrodes are stacked in sequence with a separator therebetween; and a stacked / folded electrode assembly, in which a stacked unit battery cell is wound together with a separator having a longer length.

[0008] Recently, a pouch type battery in which a stacked / folded type electrode assembly is built in a pouch type battery case provided as an aluminum laminate sheet has received much attention due to its low manufacturing cost, light weight, easy deformation, etc., and thus its use has gradually increased.

[0009] From the perspective of the structure of the soft pack type battery cell, the outside of the soft pack and the lead can be relatively firmly bonded to each other in a sealed shape. On the other hand, the internal electrode and the lead are bonded to each other by welding between each electrode tab attached to the electrode and the lead. However, due to technological progress in which the tab becomes thinner and the number of single battery cell stacks increases due to high capacity, the connection portion between the tab and the lead supporting the main body of the electrode may gradually become less durable due to the use environment such as vibration and impact.

[0010] That is, the body is supported only by the tabs welded between the electrodes and the leads without a separate supporting structure, and thus there is a limit to durability due to a use environment such as vibration and shock. Summary of the invention

[0011] Technical issues

[0012] One aspect of the present disclosure provides a secondary battery capable of firmly supporting an electrode assembly under a usage environment such as vibration and impact.

[0013] Another aspect of the present disclosure provides a secondary battery capable of effectively managing its internal temperature.

[0014] Technical Solution

[0015] A secondary battery according to the present disclosure may include: an electrode assembly in which electrodes and separators are alternately stacked; a soft pack in which the electrode assembly is accommodated; a plurality of electrode leads, which are respectively connected to two side portions of the electrode assembly and extend to the outside of the soft pack; and a support portion configured to connect the plurality of electrode leads.

[0016] In addition, a battery pack according to an embodiment of the present disclosure may include the secondary battery according to an embodiment of the present disclosure.

[0017] Beneficial Effects

[0018] According to the present disclosure, the support part supporting the electrode assembly can be provided to firmly support the electrode assembly under a use environment such as vibration and impact, thereby enhancing durability. Here, both ends of the support part can be connected to a plurality of electrode leads to more firmly support the electrode assembly.

[0019] In addition, the support part may transfer heat generated in the electrode assembly to the electrode lead to cool the surrounding portion by dissipating the heat by transferring the heat to the outside through the electrode lead.

[0020] In addition, a coolant may be contained in the support portion to cool the surrounding portion. In addition, the support portion may be provided with a temperature sensor that senses the surrounding temperature to effectively manage the internal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a plan view of a secondary battery according to a first embodiment of the present disclosure.

[0022] Figure 2 is a plan view showing an example of the interior of the secondary battery according to the first embodiment of the present disclosure.

[0023] Figure 3 is a side sectional view showing a main part of a secondary battery according to a first embodiment of the present disclosure.

[0024] Figure 4 is a perspective view of a support portion in a secondary battery according to a first embodiment of the present disclosure.

[0025] Figure 5 is a plan view of a support portion and a temperature sensor according to a first embodiment of the present disclosure.

[0026] Figure 6 is a plan view showing an example of the interior of a secondary battery according to the second embodiment of the present disclosure.

[0027] Figure 7 is a side sectional view showing a main part of a secondary battery according to a second embodiment of the present disclosure.

[0028] Figure 8 is a perspective view of a support portion in a secondary battery according to a second embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] The purposes, specific advantages and novel features of the present disclosure will become more apparent from the following detailed description in conjunction with the accompanying drawings. It should be noted that in this specification, figure numerals are added to the parts of the drawings with the same numerals as much as possible, even if they are shown in other drawings. In addition, the present disclosure can be implemented in different forms and should not be construed as being limited to the embodiments described herein. In the following description of the present disclosure, detailed descriptions of related technologies that may unnecessarily obscure the main points of the present disclosure will be omitted.

[0030] Secondary Battery According to First Embodiment

[0031] Figure 1 is a plan view of a secondary battery according to a first embodiment of the present disclosure, Figure 2 is a plan view showing an example of the interior of a secondary battery according to the first embodiment of the present disclosure, and Figure 3 is a side sectional view showing a main part of a secondary battery according to a first embodiment of the present disclosure.

[0032] Reference Figures 1 to 3 A secondary battery 100 according to a first embodiment of the present disclosure includes an electrode assembly 120, a soft pack 110 accommodating the electrode assembly 120, a plurality of electrode leads 140 connected to the electrode assembly 120 and extending to the outside of the soft pack 110, and a support portion 150 connected to the plurality of electrode leads 140 in the soft pack.

[0033] In addition, the secondary battery 100 according to the first embodiment of the present disclosure may further include a temperature sensor 160 that senses temperature.

[0034] More specifically, refer to Figure 3The electrode assembly 120 may be a chargeable and dischargeable power generating element and may include electrodes 123 and separators 124 that are alternately stacked.

[0035] The electrode 123 may include a positive electrode 121 and a negative electrode 122. Here, the electrode assembly 120 may have a structure in which positive electrodes 121 / separators 124 / negative electrodes 122 are alternately stacked.

[0036] The positive electrode 121 and the negative electrode 122 may be provided in the form of a quadrangular plate and stacked in one direction, and may also face each other with the separator 124 located therebetween.

[0037] The positive electrode 121 may include a positive electrode collector and a positive electrode active material stacked on the positive electrode collector.

[0038] The positive electrode current collector may be made of aluminum foil.

[0039] The positive electrode active material may include lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound or mixture including at least one of the foregoing materials.

[0040] The negative electrode 122 may include a negative electrode collector and a negative electrode active material stacked on the negative electrode collector.

[0041] For example, the negative electrode current collector may be made of copper (Cu) foil.

[0042] The negative electrode active material may be a compound or a mixture including a graphite-based material.

[0043] The separator 124 is made of an insulating material to electrically insulate the cathode 121 from the anode 122. Here, the separator 124 may be made of a polyolefin-based resin film, for example, polyethylene or polypropylene having micropores.

[0044] The electrode assembly 120 may further include an electrode tab 130 disposed 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 on each electrode 123.

[0045] The electrode tab 130 may include a positive electrode tab 131 disposed at an end of the positive electrode 121 and a negative electrode tab 132 disposed at an end of the negative electrode 122. Here, for example, the positive electrode tab 131 may be disposed at an end of one side of the positive electrode 121, and the negative electrode tab 132 may be disposed at an end of one side of the negative electrode 122.

[0046] The pouch 110 may have a receiving portion 111 a receiving the electrode assembly 120 therein.

[0047] In addition, the soft pack 110 includes a main body 111 provided with a receiving portion 111 a receiving the electrode assembly 120 and a sealing portion 112 sealed at an edge of the main body 111 .

[0048] The sealing portion 112 may be disposed on the outer peripheral surface of the secondary battery 100 and may be formed by thermal fusion. Here, the soft pack 110 may include an upper shell 110a and a lower shell 110b, and the sealing portion 112 may be formed to seal the outer peripheral surfaces of the upper shell 110a and the lower shell 110b. Here, a portion of the electrode lead 140 between the outer peripheral surface of the upper shell 110a and the outer peripheral surface of the lower shell 110b may be sealed with the outer peripheral surfaces of the upper shell 110a and the lower shell 110b. Therefore, the electrode lead 140 may be fixed to the soft pack 110 by the sealing portion 112.

[0049] In addition, the soft package 110 may include a flexible material. Here, the soft package 110 may include a first insulating layer, an aluminum (Al) sheet, and a second insulating layer stacked from the inside to the outside.

[0050] The first insulating layer may include an insulating material. Here, the first insulating layer may include a resin material.

[0051] The second insulating coating layer may include an insulating material. Here, the second insulating coating layer may include a nylon layer including a nylon material and a resin layer including a resin material.

[0052] A plurality of electrode leads 140 may be provided, which are connected to both sides of the electrode assembly 120 and extend to the outside of the soft pack so that the electrode assembly 120 is electrically connected to the outside. Here, the plurality of electrode leads 140 may be fixed to the sealing portion 112 provided on the outer peripheral surface of the soft pack 110.

[0053] 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 .

[0054] The positive lead 141 may extend from one side of the electrode assembly 120, and the negative lead 142 may extend from the other side of the electrode assembly 120. In addition, the positive lead 141 may be electrically connected to the positive electrode 121 through the positive electrode tab 131, and the negative lead 142 may be electrically connected to the negative electrode 122 through the negative electrode tab 132. Here, the positive electrode tab 131 may be connected to a first portion of the positive lead 141, and the negative electrode tab 132 may be connected to a first portion of the negative lead 142. Here, both ends of the support portion 150 may be connected to second portions of the positive lead 141 and the negative lead 142, respectively. Here, the first portion may be disposed outside the second portion.

[0055] In addition, a plurality of electrode leads 140 may extend in the length direction of the soft pack 110 .

[0056] Figure 4 is a perspective view of a support portion in a secondary battery according to a first embodiment of the present disclosure.

[0057] Reference Figure 3 and Figure 4 The support part 150 may support the electrode assembly 120 by connecting both ends to the plurality of electrode leads 140 within the soft pack 110 .

[0058] In addition, the support portion 150 may include a non-conductive material. Here, for example, the support portion 150 may include a heat dissipation plastic or a heat dissipation resin material. Here, for example, the heat dissipation plastic may specifically include a thermally conductive plastic. In addition, for example, the heat dissipation resin may specifically include a thermally conductive resin.

[0059] The support portion 150 may include a support portion having a certain strength or higher to achieve 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, for example, the support portion may include an epoxy resin having mechanical strength for support, high thermal conductivity and containing an insulating material, and the coating portion may contain a chemically resistant and insulating material, for example, silicon.

[0060] In addition, the support portion 150 may be provided in the form of a hollow tube. Here, for example, the support portion 150 may be provided in the form of a quadrangular tube. Therefore, the surface of the support portion 150 in contact with the electrode assembly 120 may provide a flat contact surface to better support the electrode assembly 120.

[0061] In addition, one end of the support portion 150 may be fixed to the lower side of the end of the positive electrode lead 141 , and the other end of the support portion 150 may be fixed to the lower side of the end of the negative electrode lead 142 .

[0062] In addition, the support portion 150 may be provided between the positive electrode 121 and the negative electrode 122. That is, the support portion 150 may be stacked in the form of a quadrilateral plate between the positive electrode 121 and the negative electrode 122 stacked in one direction. Here, for example, the support portion 150 may face the positive electrode 121 and the negative electrode 122, and the separator 124 may be located between the positive electrode 121 and the negative electrode 122. As another example, the support portion 150 may be made of an insulating material and directly face the positive electrode 121 and the negative electrode 122.

[0063] In addition, the support part 150 may penetrate the middle of the electrode assembly 120. Here, the support part 150 may penetrate the middle of the electrode assembly 120 in the stacking direction. That is, for example, when the electrodes 123 and the separators 124 are alternately stacked in the vertical direction, the support part 150 may penetrate the electrode assembly 120 in the horizontal direction and support the electrode assembly 120.

[0064] For example, the support part 150 can transfer heat generated in the electrode assembly 120 to the electrode lead 140. That is, a high heat generated in a portion of the electrode assembly 120 around the support part 150 can be transferred to the electrode lead 140, and the surrounding portion can be cooled by heat dissipation by transferring heat from the electrode lead 140 to the outside.

[0065] In addition, as another example, the support portion 150 may have a receiving space 151 for receiving a coolant to cool the surrounding portion. That is, a coolant such as cooling water may be provided inside the support portion 150 to cool the high heat generated in the electrode assembly 120 around the support portion 150. Here, the receiving space 151 of the support portion 150 may be sealed or connected to a cooling water supply line provided outside the soft pack.

[0066] In addition, as another example, the support part 150 may transfer heat generated in the electrode assembly 120 to the electrode lead 140 to indirectly cool the surrounding portion, and may also be provided with an accommodation space 151 accommodating a coolant to directly cool the surrounding portion.

[0067] Figure 5 is a plan view of a support portion and a temperature sensor according to a first embodiment of the present disclosure.

[0068] Reference Figure 3 and Figure 5 , the temperature sensor 160 may be provided on the support portion 150 to sense the ambient temperature. Here, for example, the temperature sensor 160 may be provided on the outer surface of the support portion 150.

[0069] In addition, the temperature sensor 160 may include a first temperature sensor 161 and a second temperature sensor 162 disposed at both ends of the support portion 150, and a third temperature sensor 163 disposed in the middle of the support portion 150. Therefore, the temperature around the electrode tab 130 or the electrode lead 140 may be sensed by the first temperature sensor 161 and the second temperature sensor 162, and the temperature of the middle position of the electrode assembly 120 may be sensed by the third temperature sensor 163. Therefore, temperature monitoring may be easily performed by the first temperature sensor 161, the second temperature sensor 162, and the third temperature sensor 163 to effectively manage the temperature.

[0070] The secondary battery 100 according to the first embodiment of the present disclosure configured as described above may include a support portion 150 that firmly supports the electrode assembly 120 from the use environment such as vibration and impact, thereby enhancing durability. Here, both ends of the support portion 150 may be connected to the positive electrode lead 141 and the negative electrode lead 142, respectively, so that the electrode assembly 120 may be more firmly supported.

[0071] In addition, the support part 150 may transfer heat generated in the electrode assembly 120 to the electrode lead 140 to cool the surrounding portion by heat dissipation by transferring the heat to the outside through the electrode lead 140 .

[0072] In addition, a coolant may be contained in the support portion 150 to cool the surrounding portion. In addition, the support portion 150 may be provided with a temperature sensor 160 that senses the surrounding temperature to effectively manage the internal temperature.

[0073] A battery pack may be configured to include the secondary battery 100 according to the first embodiment of the present disclosure configured as described above.

[0074] Here, the battery pack may include the secondary battery 100 and a pack case accommodating therein the secondary battery 100. In addition, the battery pack may be a battery cell stack in which a plurality of secondary batteries 100 are stacked and may be accommodated in the pack case.

[0075] Secondary battery according to the second embodiment

[0076] Hereinafter, a secondary battery according to a second embodiment of the present disclosure will be described.

[0077] Figure 6 is a plan view showing an example of the interior of a secondary battery according to a second embodiment of the present disclosure, Figure 7 is a side sectional view showing a main part of a secondary battery according to a second embodiment of the present disclosure, and Figure 8 is a perspective view of a support portion in a secondary battery according to a second embodiment of the present disclosure.

[0078] Reference Figures 6 to 8 The secondary battery 200 according to the second embodiment of the present disclosure includes: an electrode assembly 120, a soft pack 110 accommodating the electrode assembly 120, a plurality of electrode leads 140 connected to the electrode assembly 120 and extending to the outside of the soft pack 110, and a support portion 250 connected to the plurality of electrode leads 140 in the soft pack. In addition, the secondary battery 200 according to the second embodiment of the present disclosure may further include a temperature sensor for sensing temperature.

[0079] The secondary battery 200 according to the second embodiment of the present disclosure is the same as the secondary battery according to the first embodiment except for the shape of the support portion 250. Therefore, the contents of this embodiment that overlap with those according to the previous embodiment will be omitted or briefly described, and the differences therebetween will be mainly described.

[0080] More specifically, the electrode assembly 120 may be a chargeable and dischargeable power generating element, and may include electrodes 123 and separators 124 that are alternately stacked.

[0081] The electrode 123 may include a positive electrode 121 and a negative electrode 122. Here, the electrode assembly 120 may have a structure in which positive electrodes 121 / separators 124 / negative electrodes 122 are alternately stacked.

[0082] The positive electrode 121 and the negative electrode 122 may be provided in the form of a quadrangular plate and stacked in one direction, and may also face each other with the separator 124 located therebetween.

[0083] The electrode assembly 120 may further include an electrode tab 130 disposed 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 on each electrode 123.

[0084] The electrode tab 130 may include a positive electrode tab 131 disposed at an end of the positive electrode 121 and a negative electrode tab 132 disposed at an end of the negative electrode 122. Here, for example, the positive electrode tab 131 may be disposed at an end of one side of the positive electrode 121, and the negative electrode tab 132 may be disposed at an end of one side of the negative electrode 122.

[0085] The pouch 110 may have a receiving portion 111 a receiving the electrode assembly 120 therein.

[0086] In addition, the soft pack 110 includes a main body 111 provided with a receiving portion 111 a receiving the electrode assembly 120 and a sealing portion 112 sealed at an edge of the main body 111 .

[0087] The sealing portion 112 may be disposed on the outer peripheral surface of the secondary battery 200 and may be formed by thermal fusion. Here, the soft pack 110 may include an upper shell 110a and a lower shell 110b, and the sealing portion 112 may be formed to seal the outer peripheral surfaces of the upper shell 110a and the lower shell 110b. Here, a portion of the electrode lead 140 between the outer peripheral surface of the upper shell 110a and the outer peripheral surface of the lower shell 110b may be sealed with the outer peripheral surfaces of the upper shell 110a and the lower shell 110b. Therefore, the electrode lead 140 may be fixed to the soft pack 110 by the sealing portion 112.

[0088] In addition, the soft package 110 may include a flexible material. Here, the soft package 110 may include a first insulating layer, an aluminum (Al) sheet, and a second insulating layer stacked from the inside to the outside.

[0089] A plurality of electrode leads 140 may be provided, which are connected to both sides of the electrode assembly 120 and extend to the outside of the soft pack so that the electrode assembly 120 is electrically connected to the outside. Here, the plurality of electrode leads 140 may be fixed to the sealing portion 112 provided on the outer peripheral surface of the soft pack 110.

[0090] 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 .

[0091] The positive lead 141 may extend from one side of the electrode assembly 120, and the negative lead 142 may extend from the other side of the electrode assembly 120. In addition, the positive lead 141 may be electrically connected to the positive electrode 121 through the positive electrode tab 131, and the negative lead 142 may be electrically connected to the negative electrode 122 through the negative electrode tab 132. Here, the positive electrode tab 131 may be connected to a first portion of the positive lead 141, and the negative electrode tab 132 may be connected to a first portion of the negative lead 142. Here, both ends of the support portion 150 may be connected to second portions of the positive lead 141 and the negative lead 142, respectively. Here, the first portion may be disposed outside the second portion.

[0092] In addition, a plurality of electrode leads 140 may extend in the length direction of the soft pack 110 .

[0093] The support part 250 may support the electrode assembly 120 by having both ends thereof connected to the plurality of electrode leads 140 within the pouch 110 .

[0094] In addition, the support portion 250 may include a non-conductive material. Here, for example, the support portion 250 may include a heat dissipation plastic or a heat dissipation resin material. Here, for example, the heat dissipation plastic may specifically include a thermally conductive plastic. In addition, for example, the heat dissipation resin may specifically include a thermally conductive resin.

[0095] Furthermore, the support portion may comprise a non-combustible material.

[0096] The support portion 250 may include a support portion having a certain strength or higher to achieve 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, for example, the support portion may include an epoxy resin having mechanical strength for support, high thermal conductivity and containing an insulating material, and the coating portion may contain a chemically resistant and insulating material, for example, silicon.

[0097] In addition, the support portion 250 may be in the form of a plate. Here, for example, the support portion 250 may be provided in the form of a quadrilateral plate. Therefore, the surface of the support portion 150 in contact with the electrode assembly 120 may provide a flat contact surface to better support the electrode assembly 120. Here, the support portion 250 may have a plurality of through holes 252. Here, the through hole 252 may be defined as passing through in the stacking direction. Therefore, lithium ions and the like may move through the through hole 252.

[0098] In addition, one end of the support portion 250 may be fixed to the lower side of the end of the positive electrode lead 141 , and the other end of the support portion 250 may be fixed to the lower side of the end of the negative electrode lead 142 .

[0099] In addition, the support portion 250 may be provided between the positive electrode 121 and the negative electrode 122 stacked in one direction. That is, the support portion 250 may be stacked between the positive electrode 121 and the negative electrode 122 in the form of a quadrilateral plate, the positive electrode 121 and the negative electrode 122. Here, for example, the support portion 250 may face the positive electrode 121 and the negative electrode 122, and the separator 124 is located between the positive electrode 121 and the negative electrode 122. As another example, the support portion 250 may be made of an insulating material and directly face the positive electrode 121 and the negative electrode 122.

[0100] In addition, the support portion 250 may penetrate the middle of the electrode assembly 120. Here, the support portion 250 may penetrate the middle of the electrode assembly 120 in the stacking direction. That is, for example, when the electrodes 123 and the separators 124 are alternately stacked in the vertical direction, the support portion 250 may penetrate the electrode assembly 120 in the horizontal direction and support the electrode assembly 120.

[0101] The support part 250 can transfer heat generated in the electrode assembly 120 to the electrode lead 140. That is, a portion of the electrode assembly 120 around the support part 250 can transfer high heat to the electrode lead 140, and the surrounding portion can be cooled by heat dissipation by transferring heat to the outside through the electrode lead 140.

[0102] Although the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood that the scope of the present disclosure is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made thereto without departing from the spirit and scope of the present disclosure.

[0103] Furthermore, the scope of protection of the present disclosure will be set forth by the accompanying claims.

[0104] [Explanation of Reference Numerals]

[0105] 100, 200: Secondary battery

[0106] 110: Soft pack

[0107] 110a: Upper shell

[0108] 110b: Lower housing

[0109] 111: Main body

[0110] 111a: Accommodation

[0111] 112: Sealing part

[0112] 120: Electrode assembly

[0113] 121: Positive electrode

[0114] 122: Negative electrode

[0115] 123: Electrode

[0116] 124: Diaphragm

[0117] 130: Electrode terminal

[0118] 131: Positive terminal lug

[0119] 132: Negative terminal lug

[0120] 140: Electrode lead

[0121] 141: Positive lead

[0122] 142: Negative lead

[0123] 150, 250: Support part

[0124] 151: Accommodation Space

[0125] 160: Temperature sensor

[0126] 161: First temperature sensor

[0127] 162: Second temperature sensor

[0128] 163: Third temperature sensor

[0129] 252: Through hole

Claims

1. A secondary battery comprising: An electrode assembly, in which electrodes and separators are alternately stacked; a soft package, in which the electrode assembly is accommodated; A plurality of electrode leads, the plurality of electrode leads are respectively connected to two side portions of the electrode assembly and extend to the outside of the soft pack; as well as A support portion is configured to connect the plurality of electrode leads.

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

3. The secondary battery according to claim 1, wherein The support portion has an accommodation space for accommodating a coolant to cool surrounding portions.

4. The secondary battery according to claim 3, wherein The support portion is provided in the form of a quadrilateral tube.

5. The secondary battery according to claim 1, wherein The support portion further includes a temperature sensor configured to sense ambient temperature.

6. The secondary battery according to claim 5, wherein The temperature sensor comprises: a first temperature sensor and a second temperature sensor, wherein the first temperature sensor and the second temperature sensor are respectively disposed at two ends of the support portion; and A third temperature sensor is disposed in the middle of the support portion.

7. The secondary battery according to claim 1, wherein The supporting portion passes through the electrode assembly.

8. The secondary battery according to claim 1, wherein The electrodes include a positive electrode and a negative electrode, and 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. wherein 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, and Both ends of the support portion are connected to the positive electrode lead and the negative electrode lead, respectively.

9. The secondary battery according to claim 8, wherein One end of the support portion is fixed to the lower side of the end of the positive electrode lead, and The other end portion of the support portion is fixed to a lower side of an end portion of the negative electrode lead.

10. The secondary battery according to claim 8, wherein The positive electrode and the negative electrode are provided in the form of quadrilateral plates, the positive electrode and the negative electrode are stacked in one direction and face each other, the separator is interposed between the positive electrode and the negative electrode, and The support portion is disposed between the positive electrode and the negative electrode.

11. The secondary battery according to claim 8, wherein The electrode assembly further includes an electrode terminal tab, which is disposed at the end of the electrode. The electrode tabs include: a positive electrode tab, which is disposed at the end of the positive electrode; and a negative electrode tab, which is disposed at the 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 the first portion of the positive electrode lead, and the negative electrode tab is connected to the first portion of the negative electrode lead, and Both end portions of the support portion are connected to the positive electrode lead and the second portion of the negative electrode lead.

12. The secondary battery according to claim 1, wherein The plurality of electrode leads are fixed to a sealing portion provided on an outer peripheral surface of the soft pack, and Both ends of the support portion are connected to the plurality of electrode leads and support the electrode assembly.

13. The secondary battery according to claim 1, wherein The support portion is provided in the form of a plate.

14. The secondary battery according to claim 13, wherein The supporting portion has a plurality of through holes.

15. The secondary battery according to claim 1, wherein The support portion is connected to the plurality of electrode leads in the soft package. 16 . A battery pack comprising the secondary battery according to claim 1 .

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