KR20080078462A - Electric energy storage device - Google Patents

Abstract

An electric energy storing system is provided to reduce the contact resistance of a terminal, thereby improving the contact stability, electrical stability and reliability of a battery. An electric energy storing system comprises: a terminal plate(100) comprising a flat plate having a plurality of through-holes(160); and a monolithic type terminal(200) inserted into the through-hole, wherein one end of the terminal is connected to a battery, and the other end opposite to the above end is connected to an external resistance body. The terminal plate includes a planar main body for maintaining the outer shape and an elastic member adhered to the top surface of the main body.

Description

Electric energy storage device

1 is a perspective view showing a conventional secondary battery having a terminal portion having a snap-in structure.

FIG. 2A is a perspective view illustrating the terminal unit illustrated in FIG. 1. FIG.

2B and 2C are perspective views each showing a terminal plate and a terminal of the terminal portion shown in FIG. 2A.

3A is a perspective view illustrating a battery terminal unit according to an embodiment of the present invention.

3B is a perspective view illustrating a bottom surface of the terminal unit illustrated in FIG. 3A.

FIG. 3C is a perspective view illustrating the terminal illustrated in the battery terminal unit illustrated in FIG. 3A.

FIG. 4 is a perspective view illustrating an electric energy storage device including the terminal unit illustrated in FIG. 3A.

5 is a perspective view illustrating a connection form of a terminal unit and a battery according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: terminal plate 120: main body

140: elastic member 160: through hole

200: terminal 220: contact part

240: first body 260: locking jaw

280: second body 500: terminal portion

600: battery 610: container

620: lead wire 622: anode lead wire

624: cathode lead wire

The present invention relates to an electrical energy storage device, and more particularly, to an electrical energy storage device having reduced resistance and improved reliability by using an integrated terminal.

Compared with the discharge-only primary battery, the secondary battery that can be charged and discharged like a capacitor has a large effect on the resistance and efficiency of the battery according to the connection method of terminals for electrically connecting the internal current source and the external resistance. Not only that, but also the productivity of the battery itself and the user's convenience of using it. Accordingly, various studies on the terminal structure for connecting the external resistor and the battery have been progressed, and in particular, a snap-in method is widely used in view of ease of fastening.

1 is a perspective view showing a conventional secondary battery having a terminal portion having a snap-in structure. 2A is a perspective view illustrating the terminal portion shown in FIG. 1, and FIGS. 2B and 2C are perspective views illustrating the terminal plate and the terminals of the terminal portion illustrated in FIG. 2A, respectively.

1, 2A, 2B, and 2C, a conventional snap-in terminal portion 50 is located at one end of a battery B having a lead wire connected to a wound electrode, and is external to the battery B. Electrically connect the resistor. The terminal unit 50 includes a terminal plate 10 and a terminal 20 fixed to the terminal plate 10 to connect an external resistor and the battery B.

The terminal plate 10 includes a main body 12 that determines the shape of the terminal portion and an elastic member 14 that is attached to an upper surface of the main body 12 to absorb external shocks. The main body 12 has the same shape as the end of the battery B and has a disk shape in the case of having a cylindrical outer wall. Therefore, even after the terminal portion 10 and the battery B are coupled, the shape of the battery B extends to the terminal portion 10 to complete one shape as a whole.

The elastic member 14 is bonded to the upper surface of the main body 12 is formed integrally to mitigate the external impact applied to the terminal plate 12. In general, an epoxy resin, which is a synthetic resin having excellent corrosion resistance and insulation, is widely used as the main body 12, and rubber is added to the surface of the epoxy resin to protect the resin from external impact.

The terminal plate 10 includes a plurality of through holes 16. The through hole 16 penetrates the elastic member 14 and the main body 12 simultaneously. The terminal 20 electrically connecting the external resistor and the battery B is inserted into the through hole 16 and arranged.

The terminal 20 is connected to a contact portion 22 which is in electrical contact with an external resistance, a first body 24 fixed to the contact portion 22, and the first body 24 and a lead of the battery B. And a second body 26 in electrical connection with the line.

Since the contact portion 22 is electrically connected to an external resistance and the first body 24 serves as a passage for supplying current from the battery B, the contact portion 22 is preferably formed of a material having excellent electrical conductivity. Therefore, the contact portion 22 and the first body 24 are formed of iron (Fe) or copper (Cu) having excellent electrical conductivity. On the other hand, the second body 26 not only serves as a passage for supplying current from the battery B, but also is fixed to a lead wire of the battery B to connect the terminal 20 to the battery B. It also serves as a stator.

The second body 26 is mechanically coupled to the first body 24 and the lead wire of the battery B. In general, the first body 24 and the second body 26 are compressed to each other by the compressive force of the elastic member 14, the lead wire and the second body 26 using a rivet joint or welding, etc. Permanently coupled. In particular, the second body 26 is formed of aluminum (Al) in consideration of the electrochemical stability in the rivet joint or welding.

The conventional terminal structure having the structure as described above is suitable as a terminal portion for a battery of a system having a small capacity and a high allowable resistance, but when used in a battery of a system requiring a large current and requiring a resistance as small as possible. There is a problem that functions as a cause of lowering the reliability of the battery.

The first and second bodies 24 and 26 are pressed against each other by the compressive force in the vertical direction caused by the elastic member 14 to maintain contact, so that the contact is easily broken by the transverse shear force. This poor contact causes electrolyte leakage and the leaked electrolyte increases the contact resistance at the interface between the first and second bodies. In addition, since the first and second bodies 24 and 26 are formed of different materials and are compressed by external pressure, the first and second bodies 24 and 26 may generate contact resistances due to differences in materials at the contact surfaces. As charging and discharging of a large current is repeated, Joule heat is generated more strongly at the interface between the first and second bodies 24 and 26, and thermal expansion amounts of the first and second bodies 24 and 26 are different from each other. Done. Different thermal expansion amounts further increase the difference in contact resistance.

An increase in contact resistance due to the above-mentioned causes further increases the terminal heat generation, and an increase in heat generation repeats the vicious cycle of increasing the difference in contact resistance, eventually causing contact breakage between the terminal part and the battery B. Various efforts have been made to prevent the poor contact of the terminal as described above, but the fundamental solution has not yet been proposed.

A first object of the present invention for solving the above problems is to provide a terminal for a battery that can improve the contact stability of the terminal and the battery by reducing the contact resistance of the terminal.

A second object of the present invention is to provide an electric energy storage device having the terminal portion as described above.

In order to achieve the first object of the present invention, the battery terminal portion according to the present invention is a terminal plate formed of a flat plate having a plurality of through holes, and the other end inserted into the through hole and one end connected to the battery and corresponding to the one end portion. The end includes an integrated terminal connected to an external resistor.

In one embodiment, the terminal plate includes a flat body to maintain the external shape and an elastic member bonded to the upper surface of the body, the body comprises an epoxy resin and the elastic member comprises a rubber. The through hole includes a concentric cross-section circle having a same center on each of the main body and the elastic member through the elastic member and the main body at the same time.

In one embodiment, the integrated terminal is located between the first body and the first body and the second body and the first body and the first body connected to an external resistance and integrally formed with the first body and connected to one end of the battery It includes a locking step having a size larger than the hole. The first body may further include a contact portion electrically connected to the external resistor, and the terminal may include aluminum, and the first body may include a tin plating film coated on a surface thereof. The first and second bodies have a cylindrical shape having a diameter smaller than that of the through hole, and the locking jaw has a disc shape having a diameter larger than that of the through hole.

In order to achieve the second object of the present invention, an electrical energy storage device according to the present invention includes a terminal plate formed of a flat plate having a plurality of through holes, and inserted into the through holes, one end of which is connected to a battery and corresponds to the one end. The other end includes a terminal unit having an integrated terminal connected to an external resistor, and an electrical energy generating unit electrically connected to the terminal unit.

In one embodiment, the integrated terminal is formed of a first body connected to an external resistance and the first body integrally with the first body and electrically connected to one end of the electric energy generating unit, and the first and second bodies. Located between the engaging hole having a larger size than the through hole. The terminal includes aluminum and the first body includes a tin plated film coated on a surface thereof and is connected to the external resistor by soldering. The electric energy generating unit forms an electrode winding body that generates charge transfer by oxidation and reduction reactions with an electrolyte, a lead wire and an outer shape electrically connecting the electrode winding body and the terminal, and forms the electrolyte and the electrode winding body. An electric double layer capacitor including a container for sealing from the outside.

In this case, the second body may be permanently coupled with the lead wire. The permanent coupling includes a riveted joint or a welded joint, and the welded joint includes a laser welded joint or an ultrasonic welded joint.

According to the present invention configured as described above, by forming the first body in contact with the external resistor and the second body in contact with the lead wire of the battery integrally to have the same material, to prevent a poor contact between the first body and the second body It is possible to reduce the contact resistance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed subject matter is thorough and complete, and that the spirit of the present invention to those skilled in the art will fully convey. In addition, in the drawings, the terminal plate, the terminal, the battery, the lead wire, etc. are somewhat exaggerated for clarity. In addition, although the embodiment of the present invention focuses on the electric double layer capacitor, it is obvious that the embodiment of the present invention can be easily extended to other electric energy storage devices.

3A is a perspective view illustrating a battery terminal unit according to an exemplary embodiment of the present invention, and FIG. 3B is a perspective view illustrating a bottom surface of the terminal unit illustrated in FIG. 3A. FIG. 3C is a perspective view illustrating the terminal illustrated in the battery terminal unit illustrated in FIG. 3A.

3A, 3B, and 3C, the battery terminal part 500 according to the exemplary embodiment of the present invention is fixed to the terminal plate 100 and the terminal plate 10 that determine the overall shape of the terminal part, and to the external resistor and the battery. It includes a terminal 200 for connecting (not shown).

The terminal plate 100 includes a main body 120 that determines the shape of the terminal part 500 and an elastic member 140 that is attached to an upper surface of the main body 120 to absorb external shocks. The main body 120 has the same shape as the end of the battery, and in one embodiment, when the battery has a cylindrical outer wall, it may be provided in a disk shape. Therefore, even after the terminal unit 100 and the battery are combined, the shape of the battery extends to the terminal unit 500 to complete one shape as a whole. As an example, the main body 120 may be formed of bakelite (trade name: bakelite) having excellent corrosion resistance and insulation as a synthetic resin mainly containing phenol and formalin.

The elastic member 140 is bonded to the upper surface of the main body 120 to mitigate the external impact applied to the terminal plate 120, and applies a compressive force to the terminal 200 penetrating the terminal plate 100. In one embodiment, the elastic member 140 includes a rubber attached to the surface of the bakelite.

The terminal plate 100 includes a plurality of through holes 160. The through hole 160 penetrates the elastic member 140 and the main body 120 simultaneously, and includes a concentric cross section having the same center on each of the main body and the elastic member. The terminal 200 electrically connecting the external resistor and the battery is inserted into the through hole 160 and arranged. In this case, at least two through holes 160 may be formed in consideration of the positive electrode terminal and the negative electrode terminal. As the number of terminals increases, contact terminals connected in parallel to the positive and negative lead wires increase, so that current can be distributed and supplied. Therefore, the number of through holes is appropriately formed in consideration of the amount of current required for external resistance.

The terminal 200 is a contact part 220 which is in electrical contact with an external resistance, a first body 240 formed integrally with the contact part 220, and formed integrally with the first body 240 and a lead of a battery. A second body 280 electrically connected to a line and a locking step 260 located at the boundary of the first and second body 240,280.

In one embodiment, the terminal 200 has a cylindrical shape and has a smaller diameter than the through hole 160. In this case, the locking jaw 260 positioned between the first body 240 and the second body 280 has a larger size than the through hole 160. Therefore, when the terminal 200 is inserted into the through hole 160, the locking jaw 260 is caught by the surface of the elastic member 140, so that the second body 280 of the terminal 200 is inserted. May be located inside the through hole 160. In addition, a strong compressive force may be applied between the latching jaw 260 and the elastic member 140 to prevent sealing degradation between the bottom surface and the top surface of the terminal plate 100 through the through hole 60. .

In one embodiment, the contact portion 220 and the first and second bodies 240 and 280 are integrally formed and serve as a connector for electrically connecting the lead wire of the battery and the external resistor. Therefore, the terminal 200 requires excellent electrical conductivity and excellent contact characteristics with the lead wire. In the present embodiment, the terminal 200 is made of aluminum to transfer the current generated from the battery to an external resistor, and improve the electrochemical stability in the process of contact with the lead wire.

The contact portion 220 is formed at the end of the first body 240 to maintain a smooth physical contact with the external resistor. The contact portion 220 may be formed in various shapes according to the shape and function of the external resistor that maintains contact. In one embodiment, the contact portion 220 may be formed in a conical shape having a horizontal surface, and the battery and the battery including the terminal portion 500. Can be connected seamlessly.

The first body 240 may be integrally formed with the contact portion 220, and a contact layer may be formed on a surface thereof to facilitate connection with an external resistor. In one embodiment, the contact layer is formed of a tin (Sn) plating film can be easily connected to the external resistor and the contact portion 220 by a soldering process. The tin plating film is formed in a need for smoothly performing a soldering process, and when the terminal 200 and the external resistor are connected by a method other than soldering, it is apparent that another contact layer suitable for a connecting means may be formed.

The second body 280 integrally formed with the first body 240 is connected and fixed to the lead wire of the battery. In one embodiment, the second body 280 is permanently connected to the lead wire through a mechanical connection method such as rivet joints, welding, and the like. In the present embodiment, the second body 280 and the lead wire are permanently connected by arc welding or ultrasonic wave or laser welding.

According to the terminal portion 500 of the battery according to an embodiment of the present invention having the structure as described above, the contact portion 220 and the first body 240 is protruded from the upper surface of the elastic member 140 Is electrically connected to an external resistor, and an end of the second body 280 protrudes from the bottom surface of the main body 120 through the through hole 160 to provide electrical contact with the lead wire of the battery. Form. In this case, the terminal 200 including the first body 240 and the second body 280 is integrally formed to prevent contact failure between the first and second bodies 240 and 280 of the terminal 200. There is an advantage that can lower the contact resistance. In addition, since the first body 240 and the second body 280 is formed of the same material, it is possible to prevent the contact resistance occurs at the interface between the first body and the second body and accordingly different thermal expansion There is an advantage that can also prevent the increase in resistance.

4 is a perspective view illustrating an electrical energy storage device including the terminal unit illustrated in FIG. 3A, and FIG. 5 is a perspective view illustrating a connection form of a terminal unit and a battery according to an exemplary embodiment of the present disclosure.

4 and 5, the electrical energy storage device 900 according to an embodiment of the present invention protrudes through one end of the battery 600 and the battery 600 which generate and store the electric energy therein. The terminal unit 500 may be in electrical contact with one lead wire 620 and electrically connected to an external resistor.

As shown in FIG. 3A, the terminal unit 500 is integrally formed of the same material as a first body electrically connected to an external resistor and a second body electrically connected to the lead wire. Since the terminal part 500 is the same as the terminal part disclosed with reference to FIGS. 3A to 3C, a detailed description thereof will be omitted below. Therefore, hereinafter, the same reference numerals as those shown in FIGS. 3A to 3C refer to the same members.

As a temporary example, the battery 600 includes a cylindrical electric double layer capacitor, an electrode winding (not shown) that generates charge transfer by oxidation and reduction with an electrolyte, the electrode winding, and the terminal 200. ) And a container 610 for forming an outer shape of the battery 600 and sealing the electrolyte and the electrode winding body from the outside.

In one embodiment, the electrode winding is oxidized by a cathode (not shown) that generates electrons by an oxidation reaction, an anode (not shown) that absorbs the generated electrons to cause a reduction reaction, and physically separates the cathode and the anode. Separation membranes (not shown) which function as electrodes separated from each other by isolating the place where the reaction and the reduction reaction occur are sequentially wound around a winding core to form an overall cylindrical shape. At one end of the winding body, a plurality of positive electrode lead wires 622 formed by a positive electrode current collector and a plurality of negative electrode lead wires 624 formed by a negative electrode current collector are separated and protrude out of the container 610.

The positive lead 622 is electrically connected to the positive contact of the terminal 200, and the negative lead 324 is electrically connected to the negative contact of the terminal 200. A plurality of anode and cathode contacts are formed as end portions of the second body 280, which protrude from the bottom surface of the body 160 through the through holes 160. Accordingly, the plurality of positive electrode lead wires 622 contact a plurality of positive electrode contacts, and the plurality of negative electrode lead wires 624 contact a plurality of negative electrode contacts. Accordingly, since the current flowing from the battery 600 to the external resistor can be dispersed, it is preferable for charging or discharging a large current. As mentioned, the connection between the lead wire 620 and the contact is permanently connected through rivet joint or welding.

The container 610 has a cylindrical shape and accommodates the electrode winding therein. After receiving the electrode winding body, the container 610 is sealed to contact the lead connecting portion (not shown) formed at the upper end of the electrode winding body with the lead wire 620. As the container 610, a metal material such as aluminum, stainless steel, or tin plated steel may be used, or a resin material such as PE, PP, PPS, PEEK, PTFE, or ESD may be used. The material of the container 610 is used differently depending on the type of electrolyte.

After receiving and sealing an electrode winding in the container 610, an electrolyte is injected into the container 610 through an injection hole (not shown) to complete the battery 600. Subsequently, the terminal 500 is connected to the upper end of the battery 600 to complete the electrical energy storage device according to an embodiment of the present invention.

As described above, according to the battery terminal unit and the electrical energy storage device according to a preferred embodiment of the present invention, by forming the first body in contact with the external resistor and the second body in contact with the lead wire of the battery integrally formed to have the same material The contact resistance between the first body and the second body can be prevented and the contact resistance can be reduced. Accordingly, the electrical stability and reliability of the electrical energy storage device having the terminal portion can be improved.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (15)

A terminal plate formed of a flat plate having a plurality of through holes; And And an integrated terminal inserted into the through hole and having one end connected to the battery and the other end corresponding to the one end connected to an external resistor. The battery terminal unit according to claim 1, wherein the terminal plate comprises a flat body which maintains an external shape and an elastic member adhered to an upper surface of the main body. 3. The battery terminal unit according to claim 2, wherein the main body includes an epoxy resin and the elastic member includes rubber. 3. The battery terminal unit according to claim 2, wherein the through hole comprises a concentric cross section having the same center in each of the main body and the elastic member through the elastic member and the main body at the same time. The method of claim 1, wherein the integrated terminal is located between the first body and the first body and the second body and the first body and the first body connected to the external resistance and the first body and integrally connected to one end of the battery and Battery terminal unit comprising a locking step having a size larger than the through-hole. The battery terminal unit of claim 5, wherein the first body further comprises a contact portion electrically connected to the external resistance. 6. The battery terminal unit according to claim 5, wherein the terminal comprises aluminum and the first body comprises a tin plating film coated on a surface thereof. 6. The battery terminal unit according to claim 5, wherein the first and second bodies have a cylindrical shape having a diameter smaller than that of the through hole, and the locking jaw has a disc shape having a diameter larger than the through hole. A terminal unit having a terminal plate formed of a flat plate having a plurality of through holes, and an integrated terminal inserted into the through hole and having one end connected to a battery and the other end corresponding to the one end connected to an external resistor; And And an electric energy generating unit electrically connected to the terminal unit. 10. The apparatus of claim 9, wherein the integrated terminal includes a first body connected to an external resistor, a second body integrally formed with the first body, and electrically connected to one end of the electric energy generating unit. And an engaging jaw positioned between the bodies and having a larger size than the through hole. The electrical energy storage device of claim 10, wherein the terminal comprises aluminum and the first body comprises a tin plated film coated on a surface thereof and connected to the external resistor by soldering. The method of claim 10, wherein the electrical energy generating unit is formed by forming an electrode winding body for generating a charge transfer by the oxidation and reduction reaction with an electrolyte, a lead wire and an external shape electrically connecting the electrode winding body and the terminal and An electrical energy storage device comprising an electric double layer capacitor comprising a container for sealing the electrolyte and the electrode winding from the outside. The electrical energy storage device of claim 12, wherein the second body is permanently coupled to the lead wire. The electrical energy storage device according to claim 13, wherein the permanent bond comprises a rivet joint or a weld joint. 15. The apparatus of claim 14, wherein the weld joint comprises a laser weld joint or an ultrasonic weld joint.

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