KR100919103B1 - Energy storing device - Google Patents

Abstract

An energy storage device according to the present invention includes a positive electrode and a negative electrode, a positive lead wire and a negative lead wire, a separator disposed between the positive electrode and the negative electrode to electrically separate the positive electrode and the negative electrode, and the positive electrode A housing accommodating an electrode, a cathode electrode, and a separator; an electrolyte solution contained in the housing; and a cathode terminal and a cathode terminal to which the anode lead line and the cathode lead line are respectively connected; and the cathode electrode, the cathode electrode, and the separator are wound. An electrode element is formed, and an angle θ1 formed between the outer ends of the anode lead line and the cathode lead line with respect to the center of the electrode element is

(R: distance from the center of the electrode element to the lead wire end, S: distance between the positive lead wire and the negative lead wire)

As a result, it is possible to prevent a short circuit between the positive lead wire and the negative lead wire and the waste and tear of unnecessary lead wires.

Description

Energy Storage Device {ENERGY STORING DEVICE}

The present invention relates to an energy storage device, and more particularly, by appropriately adjusting the relative position and length between the positive electrode and the negative electrode lead used in the energy storage device, it is possible to prevent short circuit and rupture between the positive electrode lead and the negative electrode lead wire. It relates to an energy storage device.

In general, a battery and a capacitor are typical elements for storing electrical energy.

Ultra Capacitor, also called Super Capacitor, is an energy storage device with intermediate characteristics between an electrolytic capacitor and a secondary battery.The next generation that can be used and replaced with a secondary battery due to its high efficiency and semi-permanent life characteristics It is an energy storage device.

Ultracapacitors can be divided into electric double layer capacitors (EDLC) and pseudocapacitors according to energy storage mechanisms.

Pseudocapacitors utilize the phenomenon that charges are stored in the electrode surface or in the electrode near the surface, whereas EDLC uses the property that charge is adsorbed on the electric double layer at the electrode and electrolyte interface.

EDLC forms an electric double layer on the surface of the electrode material and the contact surface of the electrolyte by using a material having a large surface area such as activated carbon as an active material of the electrode.

That is, charge layers having different polarities at the interface between the electrode and the electrolyte solution are generated by the electrostatic effect. The charge distribution thus formed is called an electric double layer, and as a result, it has the same capacitance as in a battery.

However, the electric double layer capacitor has different charge / discharge characteristics from the battery, whereas the voltage characteristics of the battery during charge / discharge are similar to those of the plateau, In the case of the electric double layer capacitor, the voltage characteristic with time shows a linear graph characteristic during the charge / discharge process.

Therefore, the electric double layer capacitor has a characteristic that the amount of charged / discharged energy can be easily calculated by measuring a voltage.

On the other hand, the electric double layer capacitor as described above, because the mechanism for storing electricity stores the electric charge in the electric double layer formed at the interface of the electrolyte, unlike the storage battery using a chemical reaction, that is, because it uses the electrical storage by the accumulation of physical charge, No deterioration due to repeated use, high reversibility and long service life.

Therefore, it may be used as a battery replacement for applications that are not easy to maintain and require a long service life.

On the other hand, as described above, the electric double layer capacitor has a fast charging and discharging characteristic because it uses the principle of absorbing / desorbing the electric double layer generated at the interface between the electrode and the electrolyte, and accordingly, mobile communication information devices such as mobile phones, laptops, PDAs, etc. It is very suitable as main power supply or auxiliary power supply for electric vehicles, night road lights, uninterrupted power supply (UPS), etc. as well as auxiliary power supply of high capacity.

The electrodes of the electric double layer capacitor having such various uses have high energy through a large specific surface area, high output through low specific resistance, and electrochemical stability through suppression of an electrochemical reaction at an interface.

Therefore, currently active carbon powder or activated carbon fiber having a large specific surface area is most widely used as a main material of the electrode, and a low specific resistance is realized by mixing a conductor or spray coating of metal powder.

In addition, research and development of a more stable electrode material by suppressing the electrochemical side reactions occurring at the electrode interface through various methods.

SUMMARY OF THE INVENTION An object of the present invention is to provide an energy storage device capable of preventing a short circuit of a lead wire in advance by appropriately adjusting the relative position between the anode and cathode lead wires.

It is still another object of the present invention to provide an energy storage device capable of preventing unnecessary waste and rupture of lead wires by appropriately adjusting the folding length of the lead wires.

The present invention has been made to achieve the above object, the energy storage device according to the present invention, the anode electrode and cathode electrode, the anode lead wire and cathode lead wire, the anode located between the anode electrode and cathode electrode A separator for electrically separating the electrode and the cathode electrode, a housing accommodating the anode electrode, the cathode electrode and the separator, an electrolyte solution contained in the housing, and an anode terminal and a cathode terminal to which the anode lead wire and the cathode lead wire are respectively connected. The positive electrode, the negative electrode and the separator are wound to form an electrode element, the angle (θ1) formed between the outer ends of the positive lead line and the negative lead line with respect to the center of the electrode element,

(R: distance from the center of the electrode element to the lead wire end, S: distance between the positive lead wire and the negative lead wire)

Here, the distance s between the positive lead wire and the negative lead wire,

(R: distance from the center of the electrode element to the center of the lead wire, w: 1/2 the width of the lead wire)

Further, the folding angle θ3 of the lead wire,

(Θ2: center angle between the line connecting the center of the electrode element and the lead wire center and the line connecting the center of the electrode element and the outer end of the lead wire)

Preferably, the folded length L of the lead wire,

It can be configured as.

According to the present invention, a short circuit between the anode lead wire and the cathode lead wire can be prevented in advance.

In addition, unnecessary waste and rupture of the lead wire can be prevented.

1 is a perspective view of an energy storage device according to the present invention;

2 is a front view showing a state in which the electrode and the lead wire of the energy storage device according to the present invention,

3 is a plan view illustrating a state where electrodes, a lead wire, and a separator are disposed in an energy storage device according to the present invention;

4 is a side cross-sectional view showing a state in which a terminal and a lead wire of an energy storage device according to the present invention are connected;

5 is a plan view showing a cross section of a state in which lead wires are disposed with respect to an electrode and a separator of an energy storage device according to the present invention;

6 is a plan view illustrating a state in which lead wires are folded and disposed on electrodes and separators of an energy storage device according to the present invention.

Explanation of symbols on the main parts of the drawings

2, 12: current collector 4, 14: active material layer

10: anode electrode 20: cathode electrode

30: separator 40: lower housing

50: upper housing 66: positive terminal

76: negative electrode terminal

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

Prior to this, the terms used in this specification and claims should not be construed in a dictionary sense, and the inventors may properly define the concept of terms in order to explain their invention in the best way. It should be construed as meaning and concept consistent with the technical spirit of the present invention.

Therefore, the configurations shown in the embodiments and drawings described herein are only preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents may be substituted for them at the time of the present application. It is to be understood that water and variations may exist.

In addition, the drawing showing the arrangement relationship between the lead wire and the electrode element according to the present invention is a simplified drawing to obtain a design formula that meets the purpose of the present invention, it will be revealed that the relation is also a design formula based on the simplified drawing. .

1 is a perspective view of an energy storage device according to the present invention, FIG. 2 is a front view showing a state in which an electrode and a lead wire of the energy storage device according to the present invention are connected, and FIG. 3 is an electrode of the energy storage device according to the present invention. It is a top view which shows the state in which the lead wire and the separator were arrange | positioned.

1 to 3, the cell of the energy storage device 100 according to the present invention includes upper and lower housings 50 and 40 made of a metal material and an anode electrode 10 embedded in the housings 50 and 40. And a cathode electrode 20.

The anode electrode 10 includes an active material layer 4 composed of a metallic current collector 2 and porous activated carbon, and the anode lead wire 6 is connected to one side thereof.

The current collector 2 is usually configured in the form of a metal foil, and the active material layer 4 is composed of a form of coating coated on both surfaces of the metal current collector 2 as activated carbon.

The active material layers 4 and 14 are portions for storing electrical energy of the positive electrode and the negative electrode, and the current collectors 2 and 12 serve as transfer paths of charges emitted or supplied from the active material layer.

A separator 30 is disposed between the anode and cathode electrodes 10 and 20 sequentially stacked to limit electron conduction between the anode electrode 10 and the cathode electrode 20, and the upper and lower housings ( The electrolyte is filled in 50 and 40).

In this case, the porous active material layers 4 and 14 have a large surface area including pores that are almost circular in shape, and act as an active material on the anode electrode 10 and the cathode electrode 20 in the same manner. Each surface comes into contact with the electrolyte.

When voltage is applied to the electrodes 10 and 20, the positive and negative ions contained in the electrolyte move to the positive electrode 10 and the negative electrode 20, respectively, to the pores of the porous active material layers 4 and 14. Infiltrate.

The cathode electrode 10, the cathode electrode 20, and the separator 30 stacked as described above are wound in a circular shape and accommodated in the lower housing 40.

The lower housing 40 may be made of a metallic or synthetic resin material, preferably made of aluminum or an alloy thereof.

The lower housing 40 accommodates the separator 30 and the lead wires 6 and 16 for electrically separating the anode / cathode electrodes 10 and 20 and the cathode / cathode electrodes 10 and 20. It is a component for.

The upper housing 50 is coupled to the lower housing 40 seen from the upper portion of the lower housing 40, the upper housing 50 may also be composed of a metallic or synthetic resin material, preferably aluminum or its alloy It consists of.

The upper housing 50 is provided with a positive electrode terminal 66 and a negative electrode terminal 76 to which the positive lead wire 6 and the negative lead wire 16 are connected, respectively.

Here, the positive electrode terminal 66 and the negative electrode terminal 76 may be formed of any one of aluminum, steel (steel) or stainless steel to ensure mechanical strength, the surface is formed by coating by nickel or tin It can be configured to secure the bonding by soldering or the like.

Preferably, the positive electrode terminal and the negative electrode terminal 66, 76 are disposed in the direction perpendicular to each other in the processing error range on the upper housing 50.

As described above, since the positive electrode terminal and the negative electrode terminals 66 and 76 are disposed in a direction perpendicular to each other, almost the same bearing force may be generated in which direction the bending moment due to external force acts.

4 is a side cross-sectional view illustrating a state in which a terminal and a lead wire of the energy storage device according to the present invention are connected, and FIG. 5 is a cross-sectional view of a state in which the lead wire is disposed with respect to the electrode and the separator of the energy storage device according to the present invention. FIG. 6 is a plan view illustrating a state in which lead wires are folded and disposed with respect to the electrode and the separator of the energy storage device according to the present invention.

4 to 6, an energy storage device according to the present invention includes an anode electrode 10 and a cathode electrode 20, an anode lead line 6, an anode lead line 16, an anode electrode 10, A separator 30 for electrically separating the anode electrode 10 and the cathode electrode 20 positioned between the cathode electrodes 20, and the anode electrode 10, the cathode electrode 20, and the separator 30. A positive electrode terminal 66 and a negative electrode terminal 76 to which the housings 40 and 50 which accommodate the plurality of electrodes, the electrolyte solution accommodated in the housings 40 and 50, and the positive lead wire 6 and the negative lead wire 16 are respectively connected; And the anode electrode 10, the cathode electrode 20, and the separator 30 are wound to form an electrode element 15, and the anode lead line with respect to the center O of the electrode element 15. The angle θ1 formed between the outer end of 6 and the cathode lead wire 16 is

It consists of.

Here, R is a distance from the center O of the electrode element 15 to the lead wire ends E1 and E2, and S is an end E1 of the positive lead wire 6 and an end of the negative lead wire 16 ( E2) means the distance between them.

On the other hand, when the radius of the electrode element is R ', when the anode lead wire 6 and the cathode lead wire 16 are arranged farthest from each other with respect to the electrode device 15, the two lead wires 6, 16 are They are arranged to face each other, and the distance between the two lead wires is 2R '.

However, since the two lead wires 6 and 16 may not be disposed outside the electrode element 15, when the width 2w of the lead wires seen when the two lead wires 6 and 16 are folded, The maximum value of the distance S between the two leads should be 2R '-4w.

Therefore, the distance S between the positive lead wire and the negative lead wire,

Can be composed of

On the other hand, the distance R from the center O of the electrode element 15 to the lead wire ends E1, E2,

Where r is the distance from the center O of the electrode element to the center of the lead wire.

Therefore, using the second law of cosine,

(Θ1: an angle formed between the outer ends E1 and E2 of the positive lead wire and the negative lead wire with respect to the center O of the electrode element).

From the above formula,

As such,

In this case, when the θ1 has a value of 0, since the positive / cathode lead wires are mutually shorted, the θ1 is

It can be in the range of.

Meanwhile, Regarding,

Relationship is established,

therefore, Becomes

for θ2,

sinθ2 = w / R

θ2 = arcsin (w / R)

Therefore, assuming that the lead wire is folded straight upward as shown in FIG. 6 to connect the lead wire to the terminal, the angle θ3 between the lead wire and the boundary line F of the electrode element and the lead wire edge is:

Becomes a relationship.

On the other hand, when the lead wire is folded toward the center of the electrode element, the angle θ3 between the lead wire and the boundary line F of the electrode element and the edge of the lead wire is

θ3 = 90-θ2.

Therefore, in order to prevent a short circuit between the positive and negative lead wires, the folding angle θ3 of the lead wire is

It is preferable to set in the range of.

In addition, when the lead wire is disposed outside the center O of the device, the folding length L of the lead wire is 1.4 times the distance from the horizontal extension line of the end portion E1 of the lead wire to the center of the electrode element O. Given room for

It is preferable to set in the range of.

The 1.4 times margin considers that the lead wire is arranged to be out of the center of the electrode element and that the lead wire is three-dimensionally arranged along the height direction of the electrode element as shown in FIG. 4. It is a margin factor.

As mentioned above, although the present invention has been described by way of limited embodiments and drawings, the technical idea of the present invention is not limited thereto, and a person having ordinary skill in the art to which the present invention pertains, Various modifications and variations may be made without departing from the scope of the appended claims.

Claims (4)

An anode electrode and a cathode electrode; A positive lead wire and a negative lead wire; A separator disposed between the anode electrode and the cathode electrode to electrically separate the cathode electrode and the cathode electrode; A housing accommodating the positive electrode, the negative electrode and the separator; An electrolyte solution contained in the housing; A positive electrode terminal and a negative electrode terminal to which the positive lead wire and the negative lead wire are respectively connected; The positive electrode, the negative electrode and the separator are wound to form an electrode element, The angle θ1 formed between the outer ends of the positive lead wire and the negative lead wire with respect to the center of the electrode element is , R: Distance from the center of the electrode element to the end of the lead wire S: distance between positive lead wire and negative lead wire The folding angle θ3 of the lead wire is Energy storage device characterized in that. θ2: Center angle between the line connecting the center of the electrode element and the lead wire center and the line connecting the center of the electrode element and the outer end of the lead wire The method of claim 1, The distance s between the positive lead wire and the negative lead wire is Energy storage device characterized in that. R ': radius of the electrode element w: 1/2 of the width of the lead wire delete The method according to claim 1 or 2, Folded length L of the lead wire, Energy storage device characterized in that.