KR101297090B1 - Electrochemical Energy Storage Device Improved In High-Temperature Durability And Manufacturing Method Thereof - Google Patents

Electrochemical Energy Storage Device Improved In High-Temperature Durability And Manufacturing Method Thereof Download PDF

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KR101297090B1
KR101297090B1 KR1020110078559A KR20110078559A KR101297090B1 KR 101297090 B1 KR101297090 B1 KR 101297090B1 KR 1020110078559 A KR1020110078559 A KR 1020110078559A KR 20110078559 A KR20110078559 A KR 20110078559A KR 101297090 B1 KR101297090 B1 KR 101297090B1
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polymer resin
coating layer
case
resin coating
storage device
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KR1020110078559A
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Korean (ko)
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KR20130016548A (en
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한상진
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비나텍주식회사
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The present invention relates to an electrochemical energy storage device having improved high temperature durability and a method for manufacturing the same, wherein a polymer resin coating layer having excellent heat resistance is formed on an outer surface of a case or a terminal plate of the electrochemical energy storage device even when the external environment is at a high temperature. It is to improve the high temperature durability that can exert the function. The electrochemical energy storage device according to the present invention is a power storage device for storing electrochemical energy, an open portion is formed on the top, the case is formed on the top of the case, the power storage element is built through the opening, the power storage element is electrically connected to the outside A terminal plate for connecting, and a first polymer resin coating layer coated on the case outer surface. According to the present invention, the polymer resin coating layer having excellent heat resistance is formed on the outer surface or the terminal plate of the case constituting the electrochemical energy storage device, so that even when the external environment is at a high temperature, the function of the electrochemical energy storage device can be achieved. It is effective to increase high temperature durability and high temperature reliability.

Description

Electrochemical Energy Storage Device Improved In High-Temperature Durability And Manufacturing Method Thereof}

The present invention relates to an electrochemical energy storage device, and more particularly, by coating a polymer resin having excellent heat resistance on the outer surface of the case of the electrochemical energy storage device, even when the external environment is at a high temperature. The present invention relates to an electrochemical energy storage device having improved high temperature durability and a method of manufacturing the same.

Electro-chemical energy storage devices such as electrolytic capacitors, super capacitors, electric double layer capacitors (EDLC), and lithium ion capacitors (LIC) have. The can shape includes a cylindrical shape (wound type), a square shape, and the like. At this time, the cylindrical shape is manufactured by winding a capacitor element in the form of a jelly roll, and then winding it in a cylindrical case.

Electrolytic energy storage devices of cylindrical shape (wound type), for example, cylindrical (retractable) electric double layer capacitors (EDLC) and cylindrical lithium ion capacitors are mainly composed of a cylindrical case made of aluminum (Al) . 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 power storage element is a winding of the band-shaped electrode stack, specifically, the electrode stack of the positive electrode and the negative electrode, the band-shaped electrode laminate made of an electrolytic cell interposed between the electrode elements of the positive electrode and the negative electrode in a cylindrical (winding), It is constructed by taping the outer circumference so as not to loosen the wound form. The capacitor element thus wound is impregnated with the electrolytic solution, and then embedded in the cylindrical case. A terminal plate for electrically connecting the capacitor element to the outside is disposed on the upper part of the winded capacitor element.

In addition, a neck portion is formed at an upper portion of the case to prevent the terminal plate from being pushed down, and the wound electric element is embedded after the neck is formed in the case. The charge element and the external terminal are electrically connected by a terminal. Then, the terminal board is fixed to the case through a curling process in which the upper end of the case is bent.

The power storage element generally includes an electrode current collector sheet such as an aluminum foil and an electrode active material applied to the current collector sheet. The electrode active material is formed by application of a conductive paste mainly composed of activated carbon. Thereafter, the terminals are coupled to the power storage element. At this time, the portions to which the terminals are coupled are scraped off to remove the electrode active material, and then punched out. And the terminal is coupled by performing a process such as riveting (rivetting).

The electrochemical energy storage device as described above may operate at -40 ° C. to 70 ° C., but has a problem in that the high temperature durability is poor in a high temperature environment where the outside temperature is 70 ° C. or higher, thereby preventing normal operation.

Therefore, an object of the present invention is to form a polymer resin coating layer having excellent heat resistance on the outer surface of the case or the terminal plate of the electrochemical energy storage device to improve the high temperature durability electrochemical energy storage device that can exhibit its function even when the external environment is a high temperature state And a method for producing the same.

The present invention for achieving the above object is a power storage device for storing electrochemical energy, an opening is formed in the upper end, the case is formed in the upper case, the power storage device is built through the opening, the power storage It provides a electrochemical energy storage device comprising a terminal plate for electrically connecting the device to the outside, and a first polymer resin coating layer coated on the outer surface of the case.

The safety vent is formed at the bottom of the case, and discharges the gas when the internal pressure of the case is greater than a predetermined pressure by the gas generated by the power storage element drive, and the safety vent and the first polymer resin coating layer Holes may be formed in corresponding portions.

And a second polymer resin coating layer coated on the upper surface of the terminal plate.

The material of the first polymer resin coating layer and the second polymer resin coating layer may be an epoxy resin.

On the other hand, the present invention comprises the steps of preparing a power storage device for storing electrochemical energy, the step of embedding the power storage device through the opening in a case having an opening is formed on the top, the terminal plate for electrically connecting the power storage device to the outside Forming on the top of the case, and provides a manufacturing method of the electrochemical energy storage device comprising a coating step of forming a first polymer resin coating layer on the outer surface of the case.

Here, the case is formed at the bottom of the case, and further comprises a safety vent for discharging the gas when the internal pressure of the case by a gas generated by the power storage element drive more than a predetermined pressure, which is performed after the coating step The method may further include forming a hole in a portion corresponding to the safety vent in the first polymer resin coating layer.

The coating may further include forming a second polymer resin coating layer on an upper surface of the terminal plate.

Further, the coating step, after forming the first polymer resin coating layer, forming the second polymer resin coating layer, after forming the second polymer resin coating layer, to form the first polymer resin coating layer It may be any one of the steps, and forming the first polymer resin coating layer and the second polymer resin coating layer together.

In addition, the coating step may be to form a first polymer resin coating layer and a second polymer resin coating layer by dipping or spray coating.

According to the present invention, the polymer resin coating layer having excellent heat resistance is formed on the outer surface or the terminal plate of the case constituting the electrochemical energy storage device, so that even when the external environment is at a high temperature, the function of the electrochemical energy storage device can be achieved. It is effective to increase high temperature durability and high temperature reliability.

1 is a view showing an electrochemical energy storage device including a first polymer resin coating layer according to a first embodiment of the present invention.
2 is a view showing an electrochemical energy storage device including a first polymer resin coating layer and a second polymer resin coating layer according to a second embodiment of the present invention.
FIG. 3 is a view illustrating an electrochemical energy storage device including a case in which a safety vent is formed and a first polymer resin coating layer having a hole formed in a portion corresponding to the safety vent according to the third embodiment of the present invention.
4 is a view illustrating an electrochemical energy storage device including a case in which a safety vent is formed according to a fourth embodiment of the present invention, a first polymer resin coating layer and a second polymer resin coating layer having holes formed in portions corresponding to the safety vents; to be.
5 is a flowchart illustrating a method of manufacturing an electrochemical energy storage device including a first polymer resin coating layer according to an embodiment of the present invention.

In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention will be described, it should be noted that the description of other parts will be omitted so as not to obscure the subject matter of the present invention.

Also, the terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings, and the inventor is not limited to the concept of terms in order to describe his invention in the best way. It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely one preferred embodiment of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

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

1 is a view illustrating an electrochemical energy storage device 100 including a first polymer resin coating layer on an outer surface of a case according to a first embodiment of the present invention. 2 is a view showing an electrochemical energy storage device 200 including a first polymer resin coating layer and a second polymer resin coating layer according to a second embodiment of the present invention.

Referring to FIG. 1, an electrochemical energy storage device 100 according to a first embodiment of the present invention includes a power storage element 10, a case 20, and a terminal plate 30, and the terminal plate 30 includes a terminal portion ( 40) is installed. The electrical storage element 10 stores electrochemical energy. The case 20 has an opening formed on one side thereof, and the power storage element 10 is built in through the opening. In addition, the terminal plate 30 may seal the opening of the case 20, electrically connect the power storage element 10 to the outside, and may have elasticity. The first polymer resin coating layer 50 is formed on the outer surface of the case 20.

The electrochemical energy storage device 100 according to the first embodiment will be described in detail as follows.

The electrical storage device 10 stores electrochemical energy, and converts electrical energy into chemical energy or chemical energy into electrical energy. The power storage device 10 may be applied without limitation as long as the device can store electrochemical energy for use as power in an automobile or the like. The power storage element 10 has an electrolytic capacitor having a capacitance of several tens to several hundred μF (microfarads), a super capacitor having a capacitance of several parats, an electric double layer capacitor having a capacitance of 100F or more, lithium Ion capacitors and the like.

The power storage device 10 may be formed in a cylindrical shape or may be formed in a columnar shape such as a quadrilateral pillar, a pentagonal pillar and a hexagonal pillar. In addition, the hole 11 formed in the vertical direction in the center of the power storage element 10 is a core space and is a space required for manufacturing the power storage element 10. Although not shown, the power storage element 10 includes a positive electrode portion having a positive electrode current collector, a negative electrode portion having a negative electrode current collector, a separator, and an electrolyte.

The case 20 houses the power storage element 10 inserted through the opening. Since not only the power storage element 10 but also the gas generated from the power storage element 10 exist inside the case 20, aluminum or an aluminum alloy is light as a material of the case 20 and has little influence of corrosion due to gas. This can be used. The shape of the case 20 generally consists of a shape corresponding to the shape of the power storage element 10. For example, when the power storage element 10 is cylindrical, the case 20 is also cylindrical, and when the power storage element 10 is a prismatic shape such as a quadrangular pillar, the case 20 may also be a square shape. Alternatively, the power storage element 10 may have a cylindrical shape, and the case 20 may have a square shape, or the case 20 may have a square shape and the power storage element 10 may have a cylindrical shape.

The terminal plate 30 is installed to seal the opening of the upper end of the case 20, and blocks the inside and the outside of the power storage element 10. An elastic rubber material may be used as the terminal plate 30. For example, an olefinic synthetic rubber such as ethylene propylene copolymer (EPT), ethylene propylene diene copolymer (EPDM), silicone rubber, fluorine rubber, or the like may be used. At this time, the upper end of the case 20 close to the opening is deformed inward, and the terminal plate 30 is mounted on the end of the case 20 in a state where the terminal plate 30 is mounted on a portion provided by the deformation of the case 20. By bending to the outer side of the contact with the terminal plate 30, the inside of the case 20 in which the power storage element 10 is built is sealed.

The terminal unit 40 is fixedly installed by the terminal plate 30 and electrically connects the power storage element 10 and the external load terminal in the case 20. The terminal portion 40 includes terminals 41 extending from the power storage element 10 and protruding above the terminal plate 30, and lead wires 43 connected to each of the terminals 41. It is electrically connected to an external load end.

In particular, the terminal plate 30 may seal the opening of the case 20, electrically connect the power storage element 10 embedded in the case 20 to the outside, and may have elasticity.

In this case, the terminal plate 30 may have a shape of a disc, a square plate, a pentagonal plate, a hexagonal plate, etc. to correspond to the shape of the case 20.

Here, the upper surface of the terminal plate 30 may further include a second polymer resin coating layer.

The first polymer resin coating layer and the second polymer resin coating layer described above may be made of a polymer resin having excellent mechanical properties and heat resistance, and preferably may be made of an epoxy resin.

Epoxy resin is a thermosetting resin produced by polymerizing a resinous resin and an epoxy group having an epoxy group in a molecule. It is excellent in mechanical properties such as bending strength and hardness, and does not generate volatile substances and shrinkage in volume during curing. It has a feature of great adhesion to cotton.

Examples of the epoxy resins used in the present invention include bisphenol A type epoxy resins, bisphenol F type epoxy resins, phenol novolac type epoxy resins, cresol novolac type epoxy resins, hydrogenated bisphenol A type epoxy resins, and brominated At least one of the group selected from an epoxy resin, a BPA- novolac-type epoxy resin, a cycloaliphatic epoxy resin, or a mixture thereof.

Since epoxy resin has excellent mechanical properties and heat resistance, the electrochemical energy storage device coated with epoxy resin on the case can function as an energy storage device even when the external environment is at a high temperature of 70 ° C. or higher. It is effective in increasing durability and high temperature reliability. In addition, the polymer resin, preferably the epoxy resin is excellent in mechanical strength is not easily deformed by the external force has the effect of improving the mechanical durability of the electrochemical energy storage device.

3 is a view illustrating an electrochemical energy storage device 300 including a case in which a safety vent is formed and a first polymer resin coating layer having a hole formed in a portion corresponding to the safety vent according to the third embodiment of the present invention. 4 is an electrochemical energy storage device 400 including a case in which a safety vent is formed according to a fourth embodiment of the present invention, a first polymer resin coating layer and a second polymer resin coating layer having holes formed in portions corresponding to the safety vents. ).

The safety vent 21 is formed at the bottom of the case 20, serves to support the power storage element 10 accommodated in the case 20, and discharges gas inside the case 20 to the outside of the case 20. Do it.

As the power storage device 10 is driven, gas is generated in the case 20 by a chemical reaction or the like, and the pressure inside the case 20 is gradually increased by the gases generated in this way. If the pressure inside the case 20 becomes too high, there is a risk of explosion.

Accordingly, in general, the electrochemical energy storage device is designed so that the gas is automatically discharged when the pressure inside the case of the electrochemical energy storage device is above a certain pressure, which is usually 40Kg / cm 2 When the safety vent 21 is formed at the bottom of the case 10 to operate at the internal pressure of the degree, the pressure inside the case is greater than the pressure, the gas inside the case through the deformation and opening of the safety vent 21 to the outside To be discharged.

The safety vent 21 is in the form of a thin film and is the weakest part of the electrochemical energy storage device. Therefore, when the internal pressure of the case 20 becomes higher than or equal to the maximum pressure that the safety vent 21 can overcome by the gas generated due to the operation of the power storage element 10, that is, a chemical reaction, the safety vent 21 Is deformed first without overcoming the pressure inside the case, and eventually opened to discharge the gas inside the case 20 to the outside.

In the third embodiment, an example in which one safety vent 21 is formed is described, but the present invention is not limited thereto.

And a first polymer resin coating layer on an outer surface of the case of the electrochemical energy storage device including the case in which the aforementioned safety vent 21 is formed. Here, the first polymer resin coating layer has a hole 51 formed at a portion corresponding to the safety vent 21 formed at the bottom of the case. Therefore, when there are a plurality of safety vents formed in the case, a plurality of holes may be formed in the first polymer resin coating layer.

And also may further include a second polymer resin coating layer coated on the upper surface of the terminal plate (30).

5 is a flowchart illustrating a method of manufacturing an electrochemical energy storage device including a first polymer resin coating layer according to an embodiment of the present invention.

In step S10, a power storage device is prepared. Capacitors store electrochemical energy and convert electrical energy into chemical energy or chemical energy into electrical energy. The storage element is an electrolytic capacitor having a capacitance of several tens to hundreds of microfarads (microfarads), a supercapacitor having a few parrots of capacitance, an electric double layer capacitor having a capacitance of 100F or more, a lithium ion capacitor, or the like. This can be

Such a power storage element may have a cylindrical shape or may have a prismatic shape such as a quadrilateral pillar, a pentagonal pillar and a hexagonal pillar. The power storage element includes a positive electrode portion having a positive electrode current collector, a negative electrode portion having a negative electrode current collector, a separator, and an electrolyte.

Subsequently, the power storage device is built into the case in which the opening is formed in step S20. As a material of the case, aluminum or an aluminum alloy may be used which is light and has little influence of corrosion due to gas. The shape of the case generally consists of a shape corresponding to the shape of the power storage element.

Subsequently, in step S30, a terminal plate for electrically connecting the power storage element to the outside is formed on the upper case. An elastic rubber material may be used as the terminal plate. For example, an olefinic synthetic rubber such as ethylene propylene copolymer (EPT), ethylene propylene diene copolymer (EPDM), silicone rubber, fluorine rubber, or the like may be used. At this time, the upper end of the case close to the opening is deformed inward, and in the state where the terminal plate is mounted on the part provided by the deformation of the case, the end of the case is bent toward the outside of the terminal plate to be in close contact with the terminal plate. The interior of the case can be sealed.

Subsequently, in step S40, a coating step of forming a first polymer resin coating layer on an outer surface of the case is performed.

The case may further include a safety vent formed at the bottom of the case, and after forming the first polymer resin coating layer, may further include forming a hole in a portion corresponding to the safety vent formed in the case.

The coating step may further include forming a second polymer resin coating layer on the upper surface of the terminal plate, and after forming the first polymer resin coating layer, forming the second polymer resin coating layer and the second polymer resin. After forming the coating layer, it may be any one of the steps of forming the first polymer resin coating layer, and the step of forming the first polymer resin coating layer and the second polymer resin coating layer together.

The first polymer resin and the second polymer resin described above may be a polymer resin having excellent mechanical properties and heat resistance, and preferably may be an epoxy resin.

Examples of the epoxy resins used in the present invention include bisphenol A type epoxy resins, bisphenol F type epoxy resins, phenol novolac type epoxy resins, cresol novolac type epoxy resins, hydrogenated bisphenol A type epoxy resins, and brominated At least one of the group selected from an epoxy resin, a BPA- novolac-type epoxy resin, a cycloaliphatic epoxy resin, or a mixture thereof.

In addition, the first polymer resin and the second polymer resin may be formed by dipping (immersion) or spray coating.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: power storage element
11: hall
20: case
21: safety vent
30: terminal plate
40: terminal part
41: terminal
43: lead wire
50: first polymer resin coating layer
51: hole
60: second polymer resin coating layer
100, 200, 300, 400: electrochemical energy storage device

Claims (9)

A storage device for storing electrochemical energy;
An opening part formed at an upper end thereof, and a case in which the power storage device is built through the opening part;
A terminal plate formed at an upper end of the case and electrically connecting the power storage element to the outside;
A safety vent formed at a lower end of the case and discharging the gas when a pressure inside the case is greater than or equal to a predetermined pressure by a gas generated by driving the power storage element; And
A polymer resin coating layer coated on an outer surface of the case and an upper surface of the terminal plate and having holes formed in portions corresponding to the safety vents;
Electrochemical energy storage device comprising a. The method of claim 1, wherein the polymer resin coating layer,
A first polymer resin coating layer coated on an outer surface of the case and having a hole formed in a portion corresponding to the safety vent;
A second polymer resin coating layer coated on an upper surface of the terminal plate;
Electrochemical energy storage device comprising a. delete The method of claim 2,
Electrochemical energy storage device, characterized in that the material of the first polymer resin coating layer and the second polymer resin coating layer is an epoxy resin. Preparing a power storage device for storing electrochemical energy;
Embedding the power storage device through the opening in a case having an opening formed at an upper end thereof;
Forming a terminal plate on an upper end of the case for electrically connecting the power storage element to the outside;
Forming a first polymer resin coating layer on an outer surface of the case and forming a second polymer resin coating layer on an upper surface of the terminal plate; And
Is formed in the lower end of the case, by the gas generated by the power storage element drive to form a hole in the first polymer resin coating layer portion corresponding to the safety vent for discharging the gas when the internal pressure of the case is above a certain pressure step;
Method of manufacturing an electrochemical energy storage device comprising a. The method of claim 5, wherein in the coating step,
The method of manufacturing an electrochemical energy storage device, characterized in that the material of the first polymer resin coating layer and the second polymer resin coating layer is an epoxy resin. delete The method of claim 5, wherein the coating step,
After forming the first polymer resin coating layer, forming the second polymer resin coating layer;
After forming the second polymer resin coating layer, forming the first polymer resin coating layer; And
Forming the first polymer resin coating layer and the second polymer resin coating layer together;
Method of manufacturing an electrochemical energy storage device, characterized in that any one of. The method of claim 5, wherein the coating step,
A method of manufacturing an electrochemical energy storage device, characterized in that to form a first polymer resin coating layer and a second polymer resin coating layer by dipping or spray coating.
KR1020110078559A 2011-08-08 2011-08-08 Electrochemical Energy Storage Device Improved In High-Temperature Durability And Manufacturing Method Thereof KR101297090B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200125251A (en) 2019-04-26 2020-11-04 비나텍주식회사 Electrochemical energy storage device comprising polymer case and manufacturing method thereof

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Publication number Priority date Publication date Assignee Title
CN114864304B (en) * 2022-05-05 2024-06-21 肇庆绿宝石电子科技股份有限公司 Capacitor preparation process capable of reducing leakage current and capacitor

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Publication number Priority date Publication date Assignee Title
KR20050018269A (en) * 2003-08-16 2005-02-23 삼성에스디아이 주식회사 A Can Shape with Many Sets of Safety Vents in Rechargeable Batteries
JP2007103532A (en) 2005-09-30 2007-04-19 Nippon Chemicon Corp Manufacturing method of chip type electrolytic capacitor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050018269A (en) * 2003-08-16 2005-02-23 삼성에스디아이 주식회사 A Can Shape with Many Sets of Safety Vents in Rechargeable Batteries
JP2007103532A (en) 2005-09-30 2007-04-19 Nippon Chemicon Corp Manufacturing method of chip type electrolytic capacitor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200125251A (en) 2019-04-26 2020-11-04 비나텍주식회사 Electrochemical energy storage device comprising polymer case and manufacturing method thereof

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