KR100922572B1 - Vibration resistant energy storage device having and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a vibration-resistant energy storage device and a manufacturing method thereof, and more particularly, to a vibration-resistant energy storage device and a method for manufacturing the same, which are prevented from shaking due to vibration or shock, thereby improving product stability and reliability. will be. The present invention provides an energy storage device in which a battery element is embedded in a resin body. In addition, the present invention comprises a first step of preparing a battery element impregnated with an electrolyte; A second step of charging the battery element into a mold; And a third step of injecting and curing the resin solution into the mold. According to the present invention, the battery element is embedded in the resin body, and shaking due to vibration or shock is prevented. Accordingly, the product is prevented from being damaged or the electrical properties are deteriorated to have an effect of improving the stability and reliability of the product.

Battery element, resin, molding, vibration, shock

Description

Vibration resistant energy storage device and manufacturing method thereof {VIBRATION RESISTANT ENERGY STORAGE DEVICE HAVING AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a vibration-resistant energy storage device and a method for manufacturing the same, and more particularly, by configuring the battery element to be embedded in the resin body, to prevent shaking or vibration to improve the stability and reliability of the product The present invention relates to a vibration resistant energy storage device and a method of manufacturing the same.

In general, an energy storage device such as a rechargeable battery capable of charging / discharging, for example, an electrolytic capacitor, an electric double layer capacitor (EDLC), has a shape of a cylindrical shape (wound type) or a square shape. At this time, the cylindrical is produced by winding the battery element in the form of a jelly roll (winding), and then embedded in a cylindrical case. This will be described with reference to FIGS. 1 and 2 as follows.

1 shows a process diagram for explaining a manufacturing process of a cylindrical (wound) energy storage device according to the prior art, Figure 2 shows an electrode device according to the prior art.

First, referring to FIG. 1, a cylindrical (wound) energy storage device, for example, a cylindrical (wound) electric double layer capacitor (EDLC) or the like, may include a cylindrical case 1 mainly made of aluminum (Al), It includes a battery element (W) built in the case (1). The cylindrical (wound) electric double layer capacitor (EDLC) is mainly applied for the purpose of driving a motor of a wind, solar, electric vehicle or hybrid vehicle. At this time, the battery element (W) is made of a band-shaped electrode stack, specifically, the electrode element (2, Fig. 2) of the positive electrode and the negative electrode, the electrolytic cell interposed between the electrode element of the positive electrode and the negative electrode (2) After winding the strip-shaped electrode stack in a cylindrical shape, it is configured by taping the outer circumference so as not to unwind the wound form. The battery element W wound as described above is impregnated in the electrolyte and then embedded in the cylindrical case 1. In addition, a terminal plate 3 is disposed above the wound battery element W, and an external terminal 4 of a lug or screw type is fastened to the terminal plate 3.

In addition, the upper part of the case (1) is formed with a neck (1a) to prevent the terminal plate (3) from being pushed down, the wound battery element (W) in the case (1) as above neck (1a) It is built after it is formed. The battery element W and the external terminal 4 are electrically connected by the terminal 2a. Thereafter, the terminal plate 3 is completed while being fixed to the case 1 through a Curing process of bending the upper end 1b of the case 1.

Meanwhile, referring to FIG. 2, a manufacturing process of the electrode device 2 according to the related art will be described.

The electrode element 2 is generally composed of an electrode current collector sheet 2b such as an aluminum foil and an electrode active material 2c coated on the current collector sheet 2b. The electrode active material 2c is formed by applying a conductive paste mainly composed of activated carbon. Thereafter, the terminal 2a is coupled to the electrode element 2, at which time, the electrode active material 2c is removed by scraping off the portion where the terminal 2a is to be coupled, and then drilling is performed. Then, the terminal 2a is coupled by performing a process such as riveting.

However, the energy storage device according to the prior art as described above has the following problems.

The battery element W is inevitably designed to be smaller than the inner diameter of the case 1 because of the neck portion 1a of the case 1. That is, the battery element W is designed to have a smaller outer diameter than the inner diameter of the case 1 as the battery element W is wound into the case 1 after the neck portion 1a has already been formed. Accordingly, an empty space S necessarily exists between the case 1 and the battery element W. As shown in FIG. At this time, the energy storage device according to the prior art, when the vibration or shock is applied from the outside due to the existence of the empty space (S) as described above, the vibration of the battery element (W) is generated, the product is damaged and reliable There is a problem falling. For example, a phenomenon occurs that the electrode of the battery element W is damaged due to shaking, and the tab terminal 2a connected to the terminal plate 3 is short-circuited. Particularly, when applied to a medium-large facility in which vibrations and shocks are severely generated, such as an automobile or heavy equipment, the shaking of the battery element W is severe and the tab terminal 2a is cut or the battery element W is dismantled. There is a problem. In addition, the energy storage device according to the prior art is pointed out problems in the manufacturing process and cost. Specifically, the manufacturing process of the cylindrical case 1 itself, the process of forming the neck (1a) in the case 1, the manufacturing and bonding process of the terminal plate 3, and the upper end (1b) of the case (1) It is pointed out that the bending process is carried out and the like, the manufacturing process is complicated, and the cost is expensive.

In addition, the conventional electrode element 2 constituting the battery element W has the following problems.

As described above, the electrode element 2 is laminated with an electrolytic cell, and then winded. At this time, the electrode is directly contacted with the terminal 2a made of metal and the electrode is damaged by friction. There is a problem. As a result, insulation resistance is generated and electrical characteristics are degraded. In addition, when the electrolytic cell is severely damaged, the adjacent electrode elements 2 are damaged and short circuits are generated.

In addition, in the energy storage device according to the prior art, in the coupling of the terminal (2a) to the electrode element 2, there is no separate coupling means other than the physical coupling through riveting after the puncturing contact due to the decrease in the coupling force There is a problem that the resistance increases.

The present invention is to solve the problems of the prior art as described above, it is possible to prevent the shaking of the battery element caused by the vibration or shock to improve the stability and reliability of the product, the manufacturing process is simple and low price An object of the present invention is to provide an energy storage device having excellent vibration resistance and a method for manufacturing the same.

In addition, the present invention, while having excellent vibration resistance as described above, by preventing direct contact between the terminal and the electrolytic cell, to prevent damage to the electrolytic cell and the electrode by the terminal during the winding (winding), improve the coupling force of the terminal to improve the electrical characteristics Another object of the present invention is to provide a vibration resistant energy storage device and a method of manufacturing the same.

The present invention to achieve the above object,

Provided is an energy storage device in which a battery element is embedded in a resin body.

In this case, according to a preferred embodiment of the present invention, the battery element is packed in an insulating packaging material and then embedded in a resin body.

In addition, the battery element is a cylindrical (winding type) formed by winding a laminate including two electrode elements and an electrolytic cell interposed between the two electrode elements, the electrode element is coupled to the electrode and the electrode Including a terminal, it is preferable that the coating layer is formed in the coupling portion to which the terminal is coupled. At this time, it is more preferable that the coating layer includes a conductive material.

In addition, the present invention,

A first step of preparing a battery element impregnated with an electrolyte solution;

A second step of charging the battery element into a mold; And

It provides a method of manufacturing an energy storage device comprising a third step of injecting and curing the resin liquid in the mold (mold).

At this time, it is preferred to further include the step of packaging the battery element with an insulating packaging material, which proceeds between the first step and the second step.

In addition, the first step,

A) manufacturing a laminated body laminated so that an electrolytic cell is interposed between two electrode elements;

Winding the laminate of step a) and then taping the outer periphery to produce a cylindrical battery element b); And

Including the step c) of impregnating the cylindrical battery element of step b) in the electrolyte,

The electrode element of step a) may include an electrode and a terminal coupled to the electrode, and a conductive coating layer may be formed on a coupling portion to which the terminal is coupled.

According to the present invention, the battery element is embedded in the resin body, and shaking due to vibration or shock is prevented. Accordingly, the product is prevented from being damaged or the electrical properties are deteriorated to have an effect of improving the stability and reliability of the product.

In addition, when the conductive coating layer is formed in the terminal coupling portion, direct contact between the terminal and the electrolytic cell is prevented. Accordingly, when the winding (winding), the friction between the terminal and the electrolytic cell does not occur, thereby preventing the electrolytic cell from being damaged, thereby improving electrical characteristics such as increased capacity and reduced resistance.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail.

3 is a configuration diagram illustrating a method of manufacturing an energy storage device according to a preferred embodiment of the present invention. 4 is a block diagram illustrating a fabrication process of an electrode device according to a preferred embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4. The accompanying drawings show a preferred embodiment of the present invention, which is provided only to explain the present invention in more detail, whereby the technical scope of the present invention is not limited. Specifically, the accompanying drawings illustrate the shape of a cylindrical (wound) energy storage device, and the energy storage device according to the present invention includes a cylindrical shape (winding type) as well as a square shape as shown in the drawings.

Referring to FIG. 3, the energy storage device according to the present invention has a structure in which the battery element 200 is embedded in the resin body 100. At this time, the battery device 200 is embedded in the molding (molding) process of the resin body (100).

The battery device 200 may have a structure as usual. For example, as shown in FIG. 3, the battery element 200 is a cylindrical (wound) wound with a winding, and has a strip-shaped electrode laminate, specifically, two electrode elements 220 of a positive electrode and a negative electrode. And, it may be of a cylindrical shape (winding type) formed by winding a strip-shaped laminate including an electrolytic cell 230 interposed between the two electrode elements 220. In addition, the battery device 200 is a laminated body including two electrode elements 220 and an electrolytic cell 230 interposed between the two electrode elements 220 as an electrode group, such electrode group is One or two or more of the plurality may be stacked and then wound. At this time, the electrolytic cell 230 is stacked on the outermost side of the battery element 200 and then wound. In addition, the electrode element 220 constituting the battery element 200 includes an electrode 222 and a terminal 224 coupled to the electrode 222, the electrode 222 is a metal current collector sheet ( 222a and an electrode active material 222b coated on the current collector sheet 222a.

In addition, the battery device 200 may be formed with an anti-loosening means 240 to prevent the wound form is released. The anti-loosening means 240 may be, for example, a tape taped along the outer circumference of the wound battery element 200, but is not limited thereto.

The battery element 200 as described above is embedded in the resin body 100 according to the present invention. Specifically, the resin liquid for molding the resin body 100 is injected into the mold 50 in the state where the battery element 200 is charged in the mold 50, and the battery element 200 is formed of a resin body ( It is embedded in the molding process of 100). In this case, one or more battery elements 200 may be embedded in the resin body 100. In the figure, one battery element 200 is illustrated. The resin body 100 is a case function, which may be composed of a resin alone, or a composition containing an additive in the resin.

According to the present invention, since the battery element 200 is integrally embedded in the molding process of the resin body 100 as described above, shaking is prevented even when a high vibration or shock is applied from the outside. Accordingly, it is excellent in vibration resistance and impact resistance to prevent damage to the product or degradation of the electrical properties. In addition, the battery cell 200 that is wound for the above reason is not loosened and maintains a state where the components are in close contact with each other. That is, the anode and cathode electrode elements 220 and the electrolytic cell 230 are kept in close contact with each other without being released or separated by external vibration or shock. Accordingly, the initial characteristics are maintained and the reliability is improved.

The resin liquid constituting the resin body 100 may be in a liquid, paste or slurry form. Although not particularly stable, the viscosity of the resin solution is preferably set to 10 to 500 poise for workability and surface properties. In this case, when the viscosity is less than 10 poise, curing time may be long or difficult to handle, and when the viscosity is greater than 500 poise, injection into the mold 50 may be difficult, and the surface may not be dispersed well in the mold 50, resulting in a uniform surface. May not have

The resin liquid may be composed of a molten resin alone or a composition containing an additive in the molten resin. At this time, the said resin is not specifically limited. The resin includes natural resins, synthetic resins (including rubbers), or mixtures thereof. For example, synthetic resins include unsaturated polyesters (PET), polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC). ), Polycarbonate (PC), polyacrylic (PA), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polystyrene (PS), polyurethane (PU) and copolymers thereof, and One kind or two or more kinds selected from epoxy resins, melamine resins, phenol resins, acrylonitrile-butadiene-styrene (ABS) resins, acrylonitrile-styrene (AS) resins, and the like can be used. In addition, butadiene rubber, butadiene-styrene rubber, or nitrile rubber may be used as the resin.

In addition, the resin liquid may be composed of a composition containing an additive in the resin as described above, wherein the additive may be appropriately selected according to the type of the resin to be used, and optionally various to provide processability or separate functionality Ingredients can be used. For example, the additives include organic solvents, pigments, fillers, mold release agents and the like.

The organic solvent may be added for viscosity control, but is not particularly limited, and may be selected from, for example, alcohols, glycols, benzenes, and the like, and may be used in an amount of 5 to 30 parts by weight based on 100 parts by weight of the resin. .

The pigments can implement various colors, and include organic pigments and inorganic pigments. For example, pigments include organic pigments such as azo, phthalocyanine, styrene, and dye lakes; Inorganic pigments, such as an oxide type, molybdenum chromium type, and a ferrocyanide type, etc. can be used. Specific examples of the oxide system include a rutile titanium dioxide (R-TiO ₂ ) white pigment. Such a pigment is not particularly limited, but may be included in an amount of 0.5 to 5.0 parts by weight based on 100 parts by weight of the resin.

The filler is for strength reinforcement and the like, and is not particularly limited and may be used in a range that does not impair the object of the present invention. The filler may be used, for example, by mixing one or two or more selected from calcium carbonate, magnesium carbonate, lithium carbonate, gypsum, mica, talc, magnesium hydroxide, aluminum hydroxide, calcium silicate, calcium aluminate, borax, and the like. Can be. Such a filler is not particularly limited, but may be included in an amount of 10 to 100 parts by weight based on 100 parts by weight of the resin. In addition, it is preferable to use what was surface-treated with a silane coupling agent, a titanate coupling agent, stearic acid, etc., in order to improve the dispersibility with resin, the mechanical strength of the resin body 100, etc. as a filler.

The releasing agent is not particularly proposed as long as it can impart fluidity to the mold 50 and the releasing property or composition, and higher fatty acids having 12 to 24 carbon atoms (or salts thereof), alcohols, esters, silicones and polyolefin waxes, etc. Can be selected from. For example, release agents include stearic acid, lauric acid, palmitic acid, myristic acid, lithium stearate, calcium palmitate, mineral oil, polyvinyl stearate, silicone, polyethylene wax (PE-wax), and paraffin wax. wax or the like, or may be used by mixing two or more kinds. Although such a mold release agent is not specifically limited, It is preferable to contain 0.05-5 weight part with respect to 100 weight part of resin.

The above-mentioned resin liquid is not particularly limited in the production method, but a resin (or a resin composition in which an additive such as a solvent, a pigment, a filler, a releasing agent, etc. in an appropriate amount) is used as a ribbon blender, a super mixer, Using a mixer or kneader such as a tumbler mixer, Banbury mixer, Henschel mixer, mixing roll, etc., it can be produced by a method such as uniform mixing or mixing kneading through a method such as hot blend or cold blend.

On the other hand, the battery element 200 is preferably packaged in an insulating packaging material and embedded in the resin body (100). In the case of packaging with an insulating packaging material as described above, it is possible to prevent the resin solution from penetrating into the battery device 200 when the resin solution is injected, and also to avoid the integrated contact between the battery device 200 and the resin solution. It is preferable to be able to block the contamination of 200. In addition, heat may be generated during molding of the resin body 100 to cause volatilization of the electrolyte solution. Specifically, heat may be generated during the curing process of the resin solution, and thus the electrolyte solution may be volatilized by such heat. In the case of packaging with an insulating packaging material, it is possible to prevent volatilization of the electrolyte.

In addition, the battery device 200 is packaged in an insulating packaging as described above, it is preferable that the vacuum packaging. In addition, the insulating packaging material may be selected from a synthetic resin material or a fiber material. For example, the insulating packaging material may be a film or a bag such as polyethylene (PE), polypropylene (PP), or polyvinyl chloride (PVC) as the synthetic resin material. In addition, the insulating packaging material may be a fabric or non-woven fabric made from cotton fibers, polyester fibers, nylon fibers or mixed fibers thereof.

The energy storage device according to the present invention described above may be manufactured through the manufacturing method of the present invention described below. Hereinafter, the manufacturing method of the present invention will be described.

The manufacturing method according to the present invention includes a first step of preparing a battery element 200 impregnated with an electrolyte; A second step of charging the battery device 200 into a mold 50; And a third step of injecting and curing the resin solution into the mold. Preferably, the process is performed between the first step and the second step, and further comprising the step of wrapping the battery element 200 with an insulating packaging material.

In the first step, the battery element 200 impregnated with the electrolyte may be manufactured in the same manner as usual. Specifically, the winding of the strip-shaped laminate including the two electrode elements 220 of the positive electrode and the negative electrode, and the electrolytic cell 230 interposed between the two electrode elements 220, the wound form is not released It can be prepared by taping the outer periphery so as to be impregnated with the electrolyte solution. At this time, the electrode element 220 of the positive electrode and the negative electrode is configured by coupling the terminal 224 to the electrode 222, the electrode 222 is a metal current collector sheet 222a and the current collector sheet 222a It may be composed of the coated electrode active material (222b). In addition, the current collector sheet 222a may be selected from a metal thin film such as aluminum foil, and the electrode active material 222b may be formed of an activated carbon paste including activated carbon and a binder resin. At this time, the electrode active material 222b is powdered activated carbon; bookbinder; Conductive additives; And a paste-like composition including a dispersion medium may be applied and formed on the current collector sheet 222a, and the binder constituting the electrode active material 222b may be polytetrafluoroethylene (PTFE) or polyvinylidene. Polyvinylidenefloride (PVdF), carboxymethylcellulose (CMC), polyvinyl alcohol (PVA; poly vinyl alcohol), polyvinyl butyral (PVB), polyvinylpyrrolidone (PVP; poly- N-vinylpyrrolidone), styrene butadiene rubber (SBR; styrene butadiene rubber) may be selected from one or two or more selected from, and the conductive additive may be selected from carbon black and the like, the dispersion medium is ethanol (EtOH) , Organic solvents such as methyl pyrrolidone (NMP), or water can be used. In addition, the terminal 224 may be made of a metal, for example, aluminum, tin, nickel, zinc, or an alloy thereof, and may be preferably made of SUS material.

After manufacturing the battery element 200 impregnated in the electrolyte as described above, it is preferable to perform vacuum packaging with an insulating packaging material. Then, the vacuum packed battery element 200 is charged in the mold 50. In this case, one or two or more battery elements 200 may be charged in the mold 50. In the drawing, one battery element 200 is illustrated. The mold 50 includes a metal material, a ceramic material, a glass material, and a synthetic resin material. In addition, as illustrated in FIG. 3, a protruding frame 55 may be formed on the inner wall of the mold 50 so that the groove 150 is formed along the outer circumference of the resin body 100. The groove 150 is intended to have a shape similar to that of the case 1 (see FIG. 1) as in the prior art, which is optional. In addition, in addition to the protruding frame 55 for forming the groove 150, the inner wall of the mold 50 may have a concave-convex structure for giving a certain shape to the resin body 100.

Next, after charging the battery element 200 in the mold 50 as above, the resin liquid is injected into the mold 50. Since the mold 50 is removed after curing and drying, an energy storage device having a structure in which the battery device 200 is embedded in the resin body 100 may be manufactured according to the present invention. In addition, the resin liquid is first injected into the mold 50, and then the battery element 200 is charged before the resin liquid is cured. Then, the resin liquid is cured and dried to form the battery element 200 inside the resin body 100. ) Can be prepared to be purchased.

Therefore, according to the present invention, as described above, the resin body 100 serves as a case for protecting the battery element 200, and the battery element 200 is integrally embedded in the molding process of the resin body 100. In addition, shaking is prevented even when severe vibrations or shocks are applied from the outside.

In addition, as in the prior art illustrated in FIG. 1, a manufacturing process of the cylindrical case 1 itself, a process of forming a neck portion 1a in the case 1, a manufacturing and bonding process of the terminal plate 3, and a case ( Since a curling process for bending the upper end 1b of 1) is not performed, the manufacturing process is simple, and thus the cost is reduced.

Meanwhile, referring to FIGS. 4 and 5, according to the preferred embodiment of the present invention, the electrode element 220 includes an electrode 222 and a terminal 224 coupled to the electrode 222. In this case, the coating layer 225 may be formed on the coupling portion to which the terminals 224 are coupled, that is, on the surface of the terminal 224.

The coating layer 225 is included in the present invention as long as it can prevent direct contact between the terminal 224 and the electrolytic cell 230, and preferably has conductivity. The coating layer 225 may be composed of, for example, a fiber sheet such as a woven fabric or a nonwoven fabric, a plastic film, or the like, and preferably includes a conductive material. Specifically, the coating layer 225 is preferably formed by attaching a sheet containing a conductive material, or is formed by coating a composition containing a conductive material. In this case, the conductive material may be included in the present invention as long as it has only conductivity, and may be composed of, for example, one or two or more selected from the group consisting of a metal, carbon powder, and a conductive polymer. The metal may be selected from silver, gold, platinum, copper, zinc, nickel, tin or alloys thereof, wherein the carbon powder is activated carbon (wherein activated carbon is in powder, crushed, granulated, as well as nanofiber forms and nanotubes). Form), graphite, pitch, carbon black, or acetylene black. In addition, the conductive polymer may be selected from polyaniline (PA), polypyrrole (PPy) and polyvinylidene fluoride (PVdF).

The coating layer 225 is more preferably formed by applying a conductive paste containing a conductive material, a binder, and a solvent as described above. In this case, the binder may be used as long as it has an adhesive force of the coating layer 225 and the terminal coupling portion, and for example, one or more resin adhesives selected from acryl, urethane, epoxy, acetate and phenol may be useful. Can be used. In addition, the solvent may be alcohol, ketone, acetate or the like, for example, may be used at least one selected from methyl ethyl ketone, butyl acetate, butyl carbitol and the like. In addition, the conductive paste is not particularly limited, but 5 to 30% by weight of a conductive material (for example, graphite, carbon black, etc.), 10 to 50% by weight of a binder (for example, acrylic resin, phenol resin, etc.), And 30 to 80 wt% of a solvent (eg, methyl ethyl ketone, butyl acetate, butyl carbitol, etc.). At this time, if the content of the conductive material is less than 5% by weight is not preferable due to its conductivity is insufficient, and if it exceeds 30% by weight, the viscosity is high and the workability such as coating property is not preferable is not good. In addition, when the content of the binder is less than 10% by weight, it is difficult to achieve good bonding strength with the terminal coupling portion due to its poor adhesion, and when the content of the binder exceeds 50% by weight, the content of the conductive material or the solvent is relatively small. This is not preferable because of falling or high viscosity. In addition, when the content of the solvent is less than 30% by weight, or more than 80% by weight, the viscosity is high or low, so the workability such as coating property is poor, which is not preferable. In addition, the conductive paste may have a viscosity of 200 to 500 poise (poise). In this case, when the viscosity of the conductive paste is less than 200 poise or exceeds 500 poise, the coating may be difficult and may not be a uniform coating.

In addition, the electrode 222 may be formed by applying the electrode active material 222b to the current collector sheet 222a, the coating layer 225 is the same material as the electrode active material 222b constituting the electrode 222. It can be configured as.

The electrode device 220 as described above may be manufactured as follows.

Referring to FIGS. 4 and 5, first, an electrode active material 222b is coated on a current collector sheet 222a such as an aluminum foil to manufacture an electrode 222. In addition, the electrode active material 222b is removed by scraping a portion to which the terminal 224 of the electrode 222 is coupled, and the terminal 224 is coupled to a portion from which the electrode active material 222b is removed. In this case, in the coupling of the terminal 224 to the electrode 222, it can be bonded using an adhesive or a welding method, as usual, after forming a hole (h) through a perforation and then riveting (rivetting) Can be combined. Next, the coating layer 225 is formed by coating a conductive paste on the surface of the terminal coupling portion, specifically, the terminal 224.

When the coating layer 225 is formed in the terminal coupling portion as described above, direct contact between the terminal 224 and the electrolytic cell 230 is prevented, thereby preventing damage to the electrolytic cell 230. In addition, damage or short circuit of the electrode 222 due to the damage of the electrolytic cell 230 is prevented. As a result, the electrical characteristics such as reduced insulation resistance and increased capacity are improved. In addition, when the coating layer 225 includes a conductive material or an adhesive binder, the capacity is further improved, and the contact force and the bonding force of the electrode 222 and the terminal 224 are increased to further improve electrical characteristics.

The energy storage device according to the present invention described above is, for example, an electrolytic capacitor, an electric double layer capacitor (EDLC), and the like. Preferably, the electrode laminate in which the electrode element 220 and the electrolytic cell 230 are laminated is jelly. It can be selected from cylindrical (wound) in roll form.

Hereinafter, the Example of this invention is illustrated. The following examples are only presented to aid the understanding of the present invention, whereby the technical scope of the present invention is not limited.

EXAMPLE

First, the specimen of the 3F class electrode 222 for the winding type EDLC which is currently used the most. Then, the surface of the electrode 222 was scraped by the surface of the terminal 224 in order to couple the terminal 224, and then punched in the scraped place, and then the terminal 224 was riveted. The electrolytic cell 230 is interposed between the two electrode elements 220 manufactured as described above, and the electrolytic cell 230 is further stacked on the outermost side, and after winding, the battery element 200 has a jelly roll state by taping the outer circumference. ) Was produced. The battery device 200 was put in a vacuum oven and dried at 140 ° C. for 48 hours to completely remove moisture.

Subsequently, the battery device 200 was impregnated in an electrolyte solution (TEABF 4 / AcN 1.0mol), and the impregnated battery device 200 was vacuum packed with a PE film. Then, the vacuum-packed battery device 200 was charged in the mold 50, and then an unsaturated polyester resin was injected into the mold 50, and then cured and dried for 24 hours and then molded. Then, the mold 50 was removed to prepare a wound-type EDLC cell specimen in which the battery element 200 was embedded in the resin body 100. The photograph of the EDLC cell specimen thus prepared is shown in FIG. 6.

As a result of measuring the capacity of the produced EDLC cell specimen using the MACCOR measurement equipment, it was confirmed that the 3F characteristics were maintained, and no shaking was caused by the molding.

Figure 1 shows a process diagram for explaining the manufacturing process of the cylindrical (wound) energy storage device according to the prior art.

Figure 2 shows an electrode element according to the prior art.

3 is a configuration diagram illustrating a method of manufacturing an energy storage device according to a preferred embodiment of the present invention.

4 is a configuration diagram illustrating a manufacturing process of an electrode element according to a preferred embodiment of the present invention.

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a photograph of an energy storage device manufactured according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: resin 200: battery element

220: electrode element 222: electrode

224 terminal 225 coating layer

230: electrolytic cell 240: loosening prevention means

Claims (8)

delete delete delete delete delete A first step of preparing a battery element impregnated with an electrolyte solution; A second step of charging the battery element into a mold; A third step of injecting and curing the resin solution into the mold; And A method of manufacturing an energy storage device, comprising the step of packaging the battery element with an insulating packaging material, which proceeds between the first step and the second step. The method of claim 6, wherein the first step, A) manufacturing a laminated body laminated so that an electrolytic cell is interposed between two electrode elements; Winding the laminate of step a) and then taping the outer periphery to produce a cylindrical battery element b); And Including the step c) of impregnating the cylindrical battery element of step b) in the electrolyte, The electrode element of step a) comprises an electrode and a terminal coupled to the electrode, the manufacturing method of the energy storage device, characterized in that the coating layer is formed in the coupling portion coupled to the terminal. The method of claim 7, wherein And the coating layer comprises a conductive material.

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