Secondary battery and its manufacturing method

Abstract

The present invention provides a secondary battery that includes an electrode assembly; a battery case that houses the electrode assembly; a first electrolyte housed in the battery case and primarily impregnated into the electrode assembly; a packaging material that is housed in the battery case and has an oxidizing portion that is oxidized and decomposed at a set voltage; and a reinforcing electrolyte member that is stored in the packaging material and drawn out of the packaging material by decomposition of the oxidizing portion, and that includes a second electrolyte that is secondarily impregnated into the electrode assembly.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0171204 filed on December 19, 2019, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a secondary battery containing two types of electrolyte solutions and a method for manufacturing the same. [Background technology]

[0003] In general, a secondary battery is a battery that can be charged and discharged, unlike a primary battery which cannot be charged. Such secondary batteries are widely used in the field of advanced electronic devices such as mobile phones, notebook computers, and camcorders.

[0004] The secondary batteries are classified into a can-type secondary battery in which an electrode assembly is housed in a metal can, and a pouch-type secondary battery in which an electrode assembly is housed in a pouch.

[0005] The can-type secondary battery includes an electrode assembly, an electrolyte, a can that contains the electrode assembly and the electrolyte, and a cap assembly that is mounted on an opening of the can, and the pouch-type secondary battery includes an electrode assembly, an electrolyte, and a pouch that contains the electrode assembly and the electrolyte.

[0006] However, although secondary batteries have electrolytes with high ionic conductivity, chemical safety, temperature stability, and low cost, the electrolytes are often added before activation, and therefore cannot be used due to their narrow operating voltage range even if they have good physical properties. [Prior art document] [Patent documents] [Patent Document 1] JP 2011-165614 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made to solve the above problems, and aims to provide a secondary battery and a manufacturing method thereof, in which a packaging material storing an electrolyte solution with excellent physical properties is housed inside a battery case housing an electrode assembly, and the packaging material is made of a material that is oxidized at a set voltage, so that after an activation process, the packaging material can be oxidized to impregnate the electrode assembly with an electrolyte solution with excellent physical properties, thereby significantly improving battery performance. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a secondary battery comprising: an electrode assembly; a battery case that houses the electrode assembly; Primary impregnation a packaging material having an oxidizing portion that is accommodated in the battery case and is oxidized and decomposed at a set voltage; and a packaging material that is stored in the packaging material and is drawn out of the packaging material by the decomposition of the oxidizing portion and is then applied to the electrode assembly. Secondary impregnation The electrolyte may include a reinforcing electrolyte member having a second electrolyte that is bonded to the electrolyte.

[0009] The oxidizing portion may be made of a polymer material or a metal material that is oxidized at a set voltage.

[0010] The packaging material may be entirely formed of an oxidized portion, or the packaging material may be partially formed of an oxidized portion.

[0011] The set voltage may be 3V.

[0012] The packaging material may be attached to an inner surface of the battery case.

[0013] The electrode assembly may include an electrode lead extending to the outside of the battery case, and an oxidation portion provided in the packaging material may be decomposed while being oxidized by a voltage transmitted from the electrode lead located inside the battery case.

[0014] The oxidized portion may include a horizontal oxidized surface formed in the longitudinal direction of the packaging material, and a vertical oxidized surface formed in the width direction of the packaging material so as to be perpendicular to the horizontal oxidized surface.

[0015] The oxidizing portion may be made of a metal material that is oxidized at a set voltage.

[0016] Meanwhile, the method for manufacturing a secondary battery of the present invention includes the steps of: (a) manufacturing a packaging material including an oxidation portion that is oxidized at a set voltage, and then injecting a second electrolyte into the packaging material to manufacture a reinforcing electrolyte member; (b) manufacturing a battery case including an upper case and a lower case; (c) attaching a reinforcing electrolyte member to the inner surface of the upper case; and (d) accommodating an electrode assembly through an opening of the battery case, and then injecting a first electrolyte into the opening of the battery case to form a reinforcing electrolyte member. Primary impregnation (e) sealing the opening of the battery case to manufacture an uncharged secondary battery; (f) charging and discharging the uncharged secondary battery to manufacture a chargeable and dischargeable secondary battery; and (g) applying a set voltage to the chargeable and dischargeable secondary battery to oxidize an oxidized portion included in the packaging material, and forming a hole in the oxidized portion through a second electrolyte solution drawn into the hole. Secondary impregnation to manufacture a finished secondary battery.

[0017] The packaging material in step (a) may be entirely formed of an oxidized portion of a polymer material, and the packaging material in step (g) may be entirely oxidized and decomposed by a set voltage.

[0018] The packaging material in step (a) may be partially formed of an oxidized portion of a polymer material, and the packaging material in step (g) may be decomposed while only the oxidized portion, which is a part of the packaging material, is oxidized by the set voltage.

[0019] In step (a), when a portion of the packaging material is formed of an oxidized portion of a polymer material, the oxidized portion may form a horizontal oxidized surface in the longitudinal direction of the packaging material, and then a vertical oxidized surface may be formed in the width direction of the packaging material perpendicular to the horizontal oxidized surface.

[0020] The packaging material in step (a) may be entirely or partially formed of an oxidized portion of a metal material. Effect of the Invention

[0021] The secondary battery of the present invention is characterized in that a reinforcing electrolyte member is incorporated in a battery case, and in this case, the reinforcing electrolyte member includes a packaging material having an oxidizing portion that is oxidized at a set voltage, and an electrolyte having excellent physical properties that is contained in the packaging material. Due to this feature, after the activation process, the oxidizing portion can be oxidized to draw the electrolyte contained in the packaging material into the battery case, and thus the electrolyte having excellent physical properties can be impregnated into the electrode assembly, thereby significantly improving the performance of the secondary battery.

[0022] Furthermore, in the secondary battery of the present invention, the oxidized portion is characterized in that it is formed from a polymer material. Due to this characteristic, the oxidized portion can be stably oxidized at a set voltage, and as a result, the electrolyte contained in the packaging material can be stably extracted into the battery case.

[0023] Meanwhile, in the secondary battery of the present invention, the oxidized portion may be formed of a metal material, and thus, the metal material of the oxidized portion can be oxidized at a set voltage, and the electrolyte contained in the packaging material can be stably extracted into the inside of the battery case.

[0024] In addition, in the secondary battery of the present invention, the packaging material is characterized in that it is entirely formed of an oxidized portion. Due to this characteristic, the packaging material can be completely oxidized so that no packaging material remains inside the battery case. As a result, it is possible to prevent defects in the electrode assembly caused by the packaging material.

[0025] In addition, in the secondary battery of the present invention, the packaging material is characterized in that a portion thereof is formed as an oxidized portion, which can minimize the generation of by-products inside the battery case. In particular, the packaging material is characterized in that a plurality of oxidized portions are formed throughout the packaging material, which can evenly extract the electrolyte contained in the packaging material throughout the battery case, thereby allowing the electrolyte having excellent physical properties to be uniformly impregnated throughout the electrode assembly.

[0026] Furthermore, in the secondary battery of the present invention, the oxidized portion is characterized in that it is oxidized at 3 V, and due to this characteristic, the oxidized portion can be prevented from being oxidized during the activation step.

[0027] In addition, in the secondary battery of the present invention, the packaging material is characterized in that it is attached to the inner surface of the battery case. This characteristic makes it possible to prevent the packaging material from moving inside the battery case, and in particular, to prevent the electrode assembly housed in the battery case from being damaged by the packaging material.

[0028] Furthermore, in the secondary battery of the present invention, the oxidized portion is characterized in that it is formed in a “+” shape on the packaging material. Due to this characteristic, the packaging material can be opened by being spread out, and as a result, the electrolyte contained in the packaging material can be quickly drawn into the inside of the battery case. [Brief description of the drawings]

[0029] [Figure 1] 1 is a cross-sectional view showing a secondary battery according to a first embodiment of the present invention. [Diagram 2] 3 is a cross-sectional view showing a state in which a reinforcing electrolyte member provided in the secondary battery according to the first embodiment of the present invention is oxidized. FIG. [Diagram 3] 4 is a flowchart showing a method for manufacturing a secondary battery according to a first embodiment of the present invention. [Figure 4] 1 is a cross-sectional view illustrating step (a) of a method for manufacturing a secondary battery according to a first embodiment of the present invention. [Diagram 5]2 is a cross-sectional view illustrating step (b) of the method for manufacturing a secondary battery according to the first embodiment of the present invention. [Figure 6] 3 is a cross-sectional view illustrating step (c) of the method for manufacturing a secondary battery according to the first embodiment of the present invention. [Figure 7] 3A to 3D are cross-sectional views illustrating steps (d) and (e) of a method for manufacturing a secondary battery according to a first embodiment of the present invention. [Figure 8] 2 is a cross-sectional view illustrating step (f) of the method for manufacturing a secondary battery according to the first embodiment of the present invention. [Figure 9] 4 is a cross-sectional view illustrating step (g) of the method for manufacturing a secondary battery according to the first embodiment of the present invention. [Figure 10] FIG. 4 is a cross-sectional view showing a secondary battery according to a second embodiment of the present invention. [Figure 11] 5 is a cross-sectional view showing a state in which a reinforcing electrolyte member included in a secondary battery according to a second embodiment of the present invention is oxidized. FIG. [Figure 12] FIG. 11 is a view showing an oxidized portion of a reinforcing electrolyte member provided in a secondary battery according to a second embodiment of the present invention. [Figure 13] 1 is a table showing the polymer material of the present invention. [Figure 14] 1 is a table showing metal materials according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. In the drawings, in order to clearly explain the present invention, parts that are not related to the description are omitted, and similar parts are designated by similar reference numerals throughout the specification.

[0031] [Secondary battery according to the first embodiment of the present invention] As shown in FIGS. 1 and 2, a secondary battery 100 according to a first embodiment of the present invention has a structure for enhancing battery performance. The secondary battery 100 includes an electrode assembly 110, a battery case 120 for accommodating the electrode assembly 110, and a conductive material that is accommodated in the battery case 120 and is connected to the electrode assembly 110. Primary impregnation A first electrolyte 130 is contained in the battery case 120 and is connected to the electrode assembly 110. Secondary impregnation The reinforcing electrolyte member 140 includes a second electrolyte that is provided in the reinforcing electrolyte member 140.

[0032] electrode assembly The electrode assembly 110 has a structure in which first and second electrodes are alternately stacked with a separator interposed therebetween. The first electrode includes an electrode tab. In particular, an electrode lead 111 extending out from the battery case 120 is coupled to the electrode tab. The first electrode may be a positive electrode, and the second electrode may be a negative electrode.

[0033] Battery case The battery case 120 includes an upper case 121 and a lower case 122 that correspond to each other, and the upper case 121 and the lower case 122 are combined to form a receiving portion that receives the electrode assembly 110 and a sealing portion that seals the receiving portion to be airtight.

[0034] 1st electrolyte The first electrolyte 130 is an electrolyte for improving the charge / discharge efficiency of the electrode assembly, and is provided in a receiving portion of the battery case 120 and is impregnated into the electrode assembly 110.

[0035] Reinforcement electrolyte material The reinforcing electrolyte member 140 contains an electrolyte for enhancing the battery performance after the activation process of the electrode assembly, and includes a packaging material 141 and a second electrolyte 142 stored in the packaging material 141.

[0036] The packaging material 141 is housed in the battery case 120 and has an oxidizing portion that is oxidized and decomposed at a set voltage. That is, the packaging material 141 can extract the second electrolyte solution stored inside the packaging material to the outside through a space formed when the oxidizing portion is oxidized.

[0037] For example, the entire packaging material 141 may be formed of an oxidized portion. That is, when the entire packaging material 141 is formed of an oxidized portion, the entire packaging material 141 can be oxidized and decomposed by a set voltage.

[0038] When a set voltage is applied to the packaging material 141 having such a configuration, the packaging material 141 formed in the oxidation portion is oxidized to form holes or spaces, thereby allowing the second electrolyte solution stored inside the packaging material to be extracted into the battery case.

[0039] Meanwhile, the set voltage may be 3 V. That is, since charging and discharging of the electrode assembly is performed at 3 V or less, it is possible to prevent the packaging material 141 from being oxidized during charging and discharging, and when a voltage of 3 V or more is applied to the packaging material 141 after the activation process, the packaging material 141 is oxidized and the second electrolyte solution can be drawn into the battery case.

[0040] On the other hand, the packaging material 141 formed in the oxidation section is made of a polymer material, i.e., a polymer substance, which is oxidized at a set voltage.

[0041] Here, the polymer material may be any one of polyethylene oxide, polypropylene oxide, polydimethylsiloxane, polyacrylonitrile, polymethyl methacrylate, polyvinyl chloride, polyvinylidene fluoride, and polyvinylidene fluoride hexafluoropropylene, as shown in FIG. 13.

[0042] Meanwhile, since the packaging material 141 is attached to the inner surface of the battery case 120, it is possible to prevent the packaging material 141 from moving within the battery case 120, thereby preventing the packaging material 141 from being wrapped around or coming into contact with the electrode tabs positioned inside the battery case 120.

[0043] The second electrolytic solution 142 is an electrolytic solution different from the first electrolytic solution, and in particular, is made of a material having better physical properties than the first electrolytic solution 130 .

[0044] Meanwhile, some of the materials used in the second electrolyte have high ionic conductivity by reacting below a set voltage (3V) to dissolve Cu. However, there is a problem that they cannot be used because they react at the set voltage. In order to solve the above problems, the present invention stores the second electrolyte in a packaging material formed in an oxidation section and houses it in a battery case, and then oxidizes the packaging material after an activation process, thereby stably impregnating the electrode assembly with the second electrolyte, thereby obtaining high ionic conductivity.

[0045] Meanwhile, the packaging material 141 may be provided to be connected to an electrode lead positioned inside the battery case. That is, the packaging material 141 is oxidized and decomposed by a voltage transmitted from the electrode lead 111 positioned inside the battery case 120, so that the packaging material 141 can be effectively oxidized. Meanwhile, the packaging material 141 may be in contact with the electrode lead 111 positioned inside the battery case 120, so that the packaging material 141 can be stably oxidized and decomposed by a voltage transmitted from the electrode lead 111.

[0046] The reinforcing electrolyte member 140 having such a configuration stores the second electrolyte 142 having physical properties in the packaging material 141 formed in the oxidation section, so that the second electrolyte 142 can be impregnated into the electrode assembly after the activation process of the electrode assembly, thereby significantly improving the battery performance.

[0047] Therefore, since the secondary battery 100 according to the first embodiment of the present invention includes a packaging material 141 having an oxidizing portion and a reinforcing electrolyte member 140 having a second electrolyte 142, the second electrolyte stored in the packaging material can be impregnated into the electrode assembly after the activation process, thereby significantly improving the performance of the electrode assembly.

[0048] A method for manufacturing the secondary battery 100 according to the first embodiment of the present invention will now be described.

[0049] [Method of manufacturing a secondary battery according to the first embodiment of the present invention] As shown in FIG. 3 to FIG. 9, the method for manufacturing a secondary battery according to the first embodiment of the present invention includes the steps of: (a) manufacturing a reinforcing electrolyte member; (b) manufacturing a battery case; (c) attaching the reinforcing electrolyte member; and (d) forming an electrode assembly. First impregnation stage , (e) manufacturing an uncharged secondary battery, (f) manufacturing a chargeable / dischargeable secondary battery, and (g) manufacturing a finished secondary battery.

[0050] (a) Stage (Figure 4) Step (a) is for manufacturing a reinforcing electrolyte member, and involves preparing an oxidized part of a polymer material that is oxidized at a set voltage, and processing the oxidized part into a pocket shape to manufacture the packaging material 141. That is, the entire packaging material 141 is formed of the oxidized part.

[0051] Next, the second electrolyte solution 142 having high physical properties is injected through the opening of the packaging material 141, and the opening of the packaging material 141 is then sealed, thereby completing the manufacture of the reinforcing electrolyte member 140.

[0052] Here, the oxidized part of the polymer material has a thickness of 0.5 mm to 1 mm so that it is easily oxidized when a set voltage is applied. That is, if the oxidized part is 0.5 mm or less, it may be easily cut open by an external impact, and if it is 1 mm or more, there is a problem that it takes a long time to oxidize. Therefore, the oxidized part of the polymer material has a thickness of 0.5 mm to 1 mm, so that it is not easily cut open by an external impact and can be quickly oxidized when a set voltage is applied.

[0053] 10, the upper surface of the packaging material 141 attached to the battery case 120 may be formed of a resin layer 141b, and the remaining portion may be formed of an oxidation portion 141a of a polymer material that is oxidized at a set voltage. Here, the resin layer is heat-sealed to the inner surface of the battery case 120. This can reduce the manufacturing cost of the packaging material 141 and can stably attach the packaging material 141 to the battery case 120. Meanwhile, the entire resin layer formed on the upper surface of the packaging material 141 is attached to the inner surface of the battery case 120, thereby preventing by-products from being generated inside the battery case.

[0054] (b) Stage (Figure 5) Step (b) is for manufacturing a battery case, in which two pouch films are formed to manufacture corresponding upper case 121 and lower case 122, and the upper case and the lower case are combined to manufacture the battery case 120.

[0055] Meanwhile, the inner surface of the upper case to which the reinforcing electrolyte member 140 is attached includes an adhesive surface 121a, which improves the adhesive strength of the reinforcing electrolyte member 140 and prevents damage to the resin layer located on the inner surface of the upper case.

[0056] (c) Stage (Figure 6) Step (c) is for attaching the reinforcing electrolyte member, and the reinforcing electrolyte member 140 is attached to the inner surface of the upper case 121 of the battery case 120. At this time, the reinforcing electrolyte member 140 is attached to the inner surface of the upper case by heat fusion or adhesive.

[0057] Meanwhile, the reinforcing electrolyte member 140 is attached to the center of the inner surface of the upper case, thereby allowing the second electrolyte 142 drawn out from the reinforcing electrolyte member 140 to be uniformly diffused throughout the electrode assembly 110 contained in the battery case 120, thereby allowing the second electrolyte 142 to be uniformly impregnated throughout the electrode assembly 110.

[0058] Meanwhile, the reinforcing electrolyte member 140 may be further attached to the inner surface of the lower case, so that the second electrolyte 142 can be effectively impregnated into the electrode assembly 110 .

[0059] Meanwhile, the reinforcing electrolyte member 140 attached to the upper case and the reinforcing electrolyte member 140 attached to the lower case are arranged so as not to correspond to each other. That is, the reinforcing electrolyte member 140 is attached to one side of the inner surface of the upper case, and the reinforcing electrolyte member 140 is attached to the other side of the inner surface of the lower case. As a result, the second electrolyte 142 can be supplied to one side and the other side of the electrode assembly, and the second electrolyte 142 can be effectively impregnated into the entire electrode assembly.

[0060] (d) Stage (Figure 7) Step (d) is an electrode assembly First impregnation stageAfter the electrode assembly 110 is accommodated through the opening of the battery case 120, the first electrolyte solution 130 is injected into the opening of the battery case 120. As a result, the first electrolyte solution 130 injected into the battery case 120 is absorbed into the electrode assembly 110. Primary impregnation will be done.

[0061] At this time, the first electrolyte 130 uses a material having excellent impregnation power and charge / discharge properties, so that the impregnation time of the electrode assembly 110 can be reduced.

[0062] (e) Stage (Figure 7) In step (e), the opening of the battery case 120 is sealed after the first electrolyte injection is completed to manufacture an uncharged secondary battery. Thus, an uncharged secondary battery can be manufactured.

[0063] (f) Stage (Figure 8) Step (f) is for manufacturing a rechargeable secondary battery, and involves charging and discharging the uncharged secondary battery to activate it, thereby manufacturing a rechargeable secondary battery.

[0064] In this case, in step (f), charging and discharging of the uncharged secondary battery is performed at a voltage of 3V or less, preferably 2V or less.

[0065] (g) Stage (Fig. 9) In step (g), a set voltage is applied to the charge / discharge secondary battery to manufacture a finished secondary battery. This voltage is transmitted to the reinforcing electrolyte member 140 attached to the battery case 120, and the packaging material 141 included in the reinforcing electrolyte member 140 is oxidized and decomposed by the set voltage, and the second electrolyte 142 stored in the packaging material 141 is drawn into the battery case 120 and is then transferred to the electrode assembly 110. Secondary impregnation When these processes are completed, the finished secondary battery 100 can be manufactured.

[0066] Here, the entire packaging material 141 is formed of an oxidized portion of a polymer material, and therefore, when a set voltage is applied to the packaging material 141, the entire packaging material 141 is oxidized and decomposed. In other words, the packaging material 141 can be naturally removed inside the battery case 120.

[0067] In the following description of other embodiments of the present invention, the same reference numerals will be used for components having the same functions as those in the above-described embodiment, and duplicated descriptions will be omitted.

[0068] [Secondary battery according to a second embodiment of the present invention] As shown in FIGS. 10 to 12, the secondary battery 100 according to the second embodiment of the present invention includes an electrode assembly 110, a battery case 120, and a first electrolyte 130. The first electrolyte 130 is contained in the battery case 120. The electrode assembly 110 is provided with a first electrolyte 130. Secondary impregnation The reinforcing electrolyte member 140 includes a packaging material 141 and a second electrolyte 142 stored in the packaging material 141.

[0069] Here, the packaging material 141 is provided with an oxidation portion 141a, a part of which is oxidized and decomposed at a set voltage. That is, the packaging material 141 is formed of an oxidation portion 141a, a part of which is oxidized and decomposed at a set voltage, and the remaining part of the packaging material 141 is formed of a resin layer 141b, which is not oxidized at a set voltage.

[0070] That is, the portion of the packaging material 141 that is attached to the battery case 120 may be formed of a resin layer 141b, and the portion that is not attached to the battery case 120 may be formed of an oxidized portion 141a.

[0071] Therefore, in the secondary battery 100 according to the second embodiment of the present invention, the second electrolyte 142 stored in the packaging material 141 can be extracted into the battery case 120 at a set voltage. (Fig. 11) In particular, the generation of by-products can be minimized by oxidizing only a portion of the packaging material 141 .

[0072] Meanwhile, the oxidized portion 141a is formed in at least two places, preferably at least ten places, in the packaging material 141. Thus, when the oxidized portion 141a is oxidized, at least ten holes can be formed in the packaging material 141, and as a result, the second electrolyte solution 142 can be effectively extracted.

[0073] Meanwhile, the oxidized portion 141a includes a horizontal oxidized surface 141a-1 formed in the longitudinal direction of the packaging material 141, and a vertical oxidized surface 141a-2 formed in the width direction of the packaging material 141 so as to be perpendicular to the horizontal oxidized surface 141a-1. As a result, when the horizontal oxidized surface 141a-1 and the vertical oxidized surface 141a-2 are oxidized, the packaging material 141 is expanded, and the second electrolyte solution 142 can be quickly extracted.

[0074] [Method of manufacturing a secondary battery according to a second embodiment of the present invention] The method for manufacturing a secondary battery according to the second embodiment of the present invention includes the steps of: (a) manufacturing a reinforcing electrolyte member; (b) manufacturing a battery case; (c) attaching the reinforcing electrolyte member; and (d) forming an electrode assembly. First impregnation stage , (e) manufacturing an uncharged secondary battery, (f) manufacturing a chargeable / dischargeable secondary battery, and (g) manufacturing a finished secondary battery.

[0075] Here, in step (a), the oxidized portion 141a of a polymer material having a predetermined size is processed, and then the oxidized portion 141a is placed in a mold having a packaging material shape. Then, a resin liquid is injected into the mold to produce a resin layer 141b. As a result, the packaging material 141 in which the oxidized portion 141a and the resin layer 141b are integrated can be manufactured.

[0076] Here, the oxidized portion forms a horizontal oxidized surface in the longitudinal direction of the packaging material, and then forms a vertical oxidized surface in the width direction of the packaging material so as to be perpendicular to the horizontal oxidized surface.

[0077] Meanwhile, when a set voltage is applied to the packaging material in step (g), the oxidized portion of the packaging material is oxidized to form a hole, through which the second electrolyte stored in the packaging material is drawn out of the battery case and impregnated into the electrode assembly.

[0078] [Secondary battery according to a third embodiment of the present invention] In the secondary battery 100 according to the third embodiment of the present invention, the oxidizing portion is formed of a metal material that is oxidized at a set voltage as shown in FIG. 14, and the metal material may be any one of aluminum, nickel, silver, gold, palladium, platinum, titanium, tantalum, copper, chromium, molybdenum, and zinc.

[0079] That is, in the secondary battery 100 according to the third embodiment of the present invention, as shown in FIG. 14, it can be confirmed that oxidation occurs at 3 V or more in any combination of a metal forming an oxidized portion and an electrolyte solution.

[0080] For example, when 3.7V is applied to a secondary battery including a reinforcing electrolyte member having an oxidized portion made of silver and an electrolyte (LIBVF4), it is confirmed that the oxidized portion of the silver material is oxidized. Therefore, the secondary battery 100 according to the third embodiment of the present invention can stably oxidize the oxidized portion at 3V or more, and as a result, the second electrolyte stored in the packaging material can be stably extracted.

[0081] The scope of the present invention is defined by the claims set forth below rather than the above detailed description, and various embodiments are possible within the meaning and scope of the claims and their equivalents. [Explanation of symbols]

[0082] 100: Secondary battery 110: Electrode assembly 120: Battery case 130: First electrolyte 140: Reinforcement electrolyte member 141: Packaging materials 141a: Oxidation part 142:Second electrolyte

Claims

1. electrode assembly; a battery case that houses the electrode assembly; a first electrolyte solution contained in the battery case and impregnating the electrode assembly; A packaging material is housed in the battery case and has an oxidation part that is oxidized and decomposed at a set potential of 3 V or more, and a reinforcing electrolyte member is stored in the packaging material and has a second electrolyte, the second electrolyte solution is drawn out of the packaging material by decomposition of the oxidizing portion and is impregnated into the electrode assembly; The second electrolytic solution reacts at a potential lower than the set potential to dissolve Cu, the electrode assembly includes an electrode lead extending to the outside of the battery case, the packaging material is connected to the electrode lead located inside the battery case, The oxidation unit includes a metal material that is oxidized at a set potential, The metal material is any one of aluminum, nickel, silver, gold, palladium, platinum, titanium, tantalum, chromium, molybdenum, and zinc.

2. The secondary battery according to claim 1 , wherein the packaging material entirely contains the oxidized portion.

3. The secondary battery according to claim 1 , wherein a portion of the packaging material includes the oxidized portion.

4. The secondary battery according to claim 1 , wherein the set potential is 3 V.

5. The secondary battery according to claim 1 , wherein the packaging material is attached to an inner surface of the battery case.

6. The secondary battery according to claim 1 , wherein the oxidized portion provided on the packaging material is decomposed while being oxidized by a potential transmitted from the electrode lead located inside the battery case.

7. 4. The secondary battery according to claim 3, wherein the oxidized portion includes a horizontal oxidized surface formed in a longitudinal direction of the packaging material, and a vertical oxidized surface formed in a width direction of the packaging material so as to be perpendicular to the horizontal oxidized surface.

8. The secondary battery according to claim 5 , wherein an inner surface of the battery case to which the packaging material is attached further includes an adhesive surface.

9. (a) preparing a packaging material including an oxidation portion that is oxidized at a set potential of 3V or more, and then injecting a second electrolyte into the packaging material to prepare a reinforcement electrolyte member; (b) fabricating a battery case including an upper case and a lower case; (c) attaching a reinforcing electrolyte member to an inner surface of the upper case; (d) accommodating an electrode assembly through the opening of the battery case, and then injecting a first electrolyte into the opening of the battery case to primarily impregnate the electrode assembly; (e) sealing the opening of the battery case to produce an uncharged secondary battery; (f) charging and discharging the uncharged secondary battery to manufacture a chargeable and dischargeable secondary battery; (g) manufacturing a completed secondary battery by applying a set potential to the charge / discharge secondary battery to oxidize an oxidized portion included in the packaging material, and then secondarily impregnating the electrode assembly with a second electrolyte solution drawn into a hole formed as the oxidized portion is oxidized, The second electrolytic solution reacts at a potential lower than the set potential to dissolve Cu, the electrode assembly includes an electrode lead extending to the outside of the battery case, the packaging material is connected to the electrode lead located inside the battery case, The packaging material is entirely or partially formed of the oxidized portion of a metal material, The metal material is any one of aluminum, nickel, silver, gold, palladium, platinum, titanium, tantalum, chromium, molybdenum, and zinc.

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