KR20140087656A - Assembly of Electric Energy Storage Device having a Connector Structure And Assembling Method thereof - Google Patents

Abstract

The present invention relates to an electric energy storage device assembly including a connection structure and a manufacturing method thereof, capable of supporting the connection of an electric energy storage device or connection between the electric energy storage devices. In the present invention, disclosed are the electric energy storage device assembly including the connection structure and the manufacturing method thereof. The electric energy storage device assembly includes: the electric energy storage device including a coupling groove in the center of a cover; a terminal fixed to and inserted into the coupling groove, and is capable of being welded; and an auxiliary terminal which is coupled to the terminal, and supports the connection of a separate device to the electric energy storage device in a location separated from the cover with a preset interval.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an electric energy storage device assembly including a connection structure,

The present invention relates to an electric energy storage device, and more particularly, to an electric energy storage device assembly including a connection structure provided to connect devices of an electric energy storage device or a connection between electric energy storage devices more easily, and a method of manufacturing the same .

In recent years, the use of energy such as hydro, wind, and solar energy, which are widely regarded as eco-friendly energy, has been increasingly used as electric energy. Unlike petroleum or coal, these eco-friendly energy have the advantage of not generating pollutants. However, environmentally friendly energy such as hydro, wind, and solar power is relatively affected by the surrounding environment. Therefore, there is a limitation in generating electric energy when necessary, and accordingly, an energy storage device . Recently, much attention has been focused on energy storage devices.

However, electric energy storage devices such as secondary batteries and electric double layer capacitors have almost similar structural characteristics, and the voltage of the unit cell is only 1.2 to 3.6V. Therefore, in order to use such an electric energy storage device in applications where a few volts larger and a few hundreds of volts of operation voltage are required, they may be connected in series and in some cases, they are connected in parallel to increase the electric energy storage capacity.

In general, soldering, welding, and screws are used to connect electrical energy storage devices.

Soldering is used as a conductor in which circuit boards connect electrical energy storage devices in a way that is often used in small electrical energy storage devices.

Welding is also often used to connect electrical energy storage devices. In particular, resistance welding is widely used for series-parallel connection of small and medium sized electric energy storage devices. However, it is difficult to use resistance welding for series-parallel connection of large electric energy storage devices. Particularly, there is a difficulty in welding such as aluminum. Recently, as laser welding technology has been developed and popularized, laser welding is widely used for serial-parallel connection of electrical energy storage devices including large-sized devices.

Screws are traditionally used in serial and parallel to electrical energy storage devices. Connecting electric energy storage devices such as secondary batteries or electric double layer capacitors in series or in parallel using screws with bus bars is a familiar method. However, in the case of aluminum, which is often used as a case material for electric energy storage devices, the possibility of thread failure including the wear of the thread due to weak tensile strength is high, and corrosion prevention treatment is required to prevent corrosion of the connection portion after the connection work.

Also, according to various demands of consumers, an electric energy storage device having a welding connection terminal and an electric energy storage device having a screw connection type terminal are produced, respectively, so that a production model is burdened.

Accordingly, it is an object of the present invention to provide an electric energy storage device assembly and a method of manufacturing the same, which include a connection structure for facilitating connection of electric energy storage devices or connection between electric energy storage devices.

According to an aspect of the present invention, there is provided an electric energy storage device including an electric energy storage device having a coupling groove formed at the center of a cover, a terminal inserted and fixed to the coupling groove, And an auxiliary terminal for supporting connection with a separate device at a position spaced apart from the cover by a predetermined distance.

The terminal includes a through hole formed at the center, and a terminal body having a cylindrical ring shape forming the through hole. The diameter of the terminal body is equal to or similar to the diameter of the coupling groove.

The terminal may be formed to have a height greater than the depth of the fastening groove, and may be disposed so that the upper end protrudes from the upper surface of the fastening groove when the terminal is inserted and fixed in the fastening groove.

The auxiliary terminal includes a first connection part having a fastening hole inserted into an upper end of the protruding terminal and fastened to the terminal through at least one of laser welding and screwing, a second connection part connected to the first connection part, Or a second connection part extending at a predetermined angle, and a third connection part extending perpendicularly or at an angle to the second connection part and arranged to face the first connection part.

The auxiliary terminal may include a first connection portion having a fastening hole inserted into an upper end portion of the protruding terminal and fastened to the terminal through at least one of laser welding and screw fastening, a first connection portion connected to the first connection portion, And a fourth connecting portion extending in a direction perpendicular or at an angle to the second connecting portion and disposed to be symmetrical with respect to the first connecting portion with respect to the second connecting portion, .

In the above-described configuration, the second connection part may include a connection hole provided at the center so as to be threaded, and at least one of the third connection part and the fourth connection part may include a connection hole .

The auxiliary terminal may include a first connection part having a fastening hole inserted into an upper end of the protruding terminal and fastened to the terminal through at least one of laser welding and screwing, a first connection part connected to the first connection part, And a second connection portion having a connection hole formed to extend vertically or at an angle and to extend through the front and rear surfaces at the center.

The electrical energy storage device may further include a bus bar connected to at least one of a connection hole formed in the auxiliary terminal and a screw connection or a welding connection.

The present invention also provides a method of manufacturing an electric energy storage device, comprising the steps of: providing an electric energy storage device having a coupling groove formed at the center of a cover; fixing a terminal formed of a material weldable to the coupling groove; And a connecting step of connecting an auxiliary terminal supporting the connection with another device to the terminal. The present invention also provides a method of manufacturing an electric energy storage device having a connection structure.

The fixing step includes laser welding the terminal so that a part of the upper end protrudes from the fastening groove.

The connecting step includes aligning a fastening hole provided at one end with a protruding upper end of the terminal, and fixing the upper end of the fastening hole and the terminal by laser welding.

The method includes aligning one side of a bus bar in a connection hole formed in the auxiliary terminal and screwing the bus bar into a connection hole of the auxiliary terminal, aligning one side of the bus bar in a connection hole formed in the auxiliary terminal, And joining the bar to the one end of the auxiliary terminal by laser welding.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram schematically illustrating the appearance of an electrical energy storage device assembly in which a connection structure according to an embodiment of the present invention is fastened. FIG.
Fig. 2 is a view for explaining a configuration of the electrode element of Fig. 1; Fig.
3 is a view showing a separated form of the electric energy storage device and the connection structure of the present invention.
4 is a view for explaining another example of the auxiliary terminal according to the embodiment of the present invention;
5 is a view for explaining a method of manufacturing an electric energy storage device assembly including a connection structure according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention will be described, and the description of other parts will be omitted so as not to disturb the gist of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor is not limited to the meaning of the terms in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents It should be understood that water and variations may be present.

Hereinafter, the roles of the configurations and configurations related to the functions of the present invention will be described in detail. Here, the features of the present invention are not limited to the above-mentioned examples. That is, the present invention should be understood not only in the above-mentioned examples, but also in form of modification of the respective constitutions described below, and also including additional functions.

FIG. 1 is a schematic view of an external appearance of an electric energy storage device assembly having a connection structure according to an embodiment of the present invention. FIG. 2 is a detailed view of an electrode device included in the electric energy storage device of the present invention. And FIG. 3 is a view showing a connection structure of the present invention separated from an electric energy storage device.

1 to 3, an electric energy storage device assembly 1 having a connection structure according to the present invention includes an electric energy storage device 10 and a connection structure 400.

The electric energy storage device assembly 1 having the connection structure according to the present invention may be constructed such that the connection structure 400 is welded to one side of the cover of the electric energy storage device 10, Connection or connection with an electrical device. Particularly, the electric energy storage device assembly 1 having the connection structure of the present invention can be used for connecting the connection structure 400 to the terminal 410 connected to the electric energy storage device 10 and other devices such as a bus bar or an electric device The auxiliary terminal 420 can be used so that it can be used adaptively according to various environments. In particular, the auxiliary terminal 420 removes unnecessary heating elements due to the pressing of the physical force or other welding to the electric energy storage device 10 during the connection of the bus bars, thereby ensuring the stability of the electric energy storage device 10 While still providing reliable device connectivity.

The electric energy storage device 10 includes a case 200 in which the electrode device 300 shown in FIG. 2 is disposed, an upper cover 110 disposed in the upper portion of the case 200, And a cover 120. The electric energy storage device 10 having such a structure is provided such that at least one of the upper cover 110 and the lower cover 120 is fastened to the connection structure 400. The terminal 410 of the connection structure 400 may be inserted and welded to the coupling groove 111 formed at the center of the upper cover 110 and the lower cover 120. The fastening groove 111 is formed in a cylindrical shape with an engraved upper part and an exposed upper part. These fastening grooves 111 are formed with a constant diameter.

The case 200 covers the outside of the electrode element 300 when the electrode element 300 is received and protects the electrode element 300 from external thermal and physical impacts. The case 200 described above may be provided in various shapes depending on the winding form of the electrode element 300. That is, the case 200 may be provided in a cylindrical shape with the front and back sides thereof opened when the electrode element 300 is wound in a cylindrical shape. The upper cover 110 may be coupled to the front surface of the case 200 having the front and rear openings, and the lower cover 120 may be coupled to the rear surface thereof. The case 200 may be made of a material having a predetermined rigidity, such as a metal material or a reinforced plastic material.

The electrode element 300 has a configuration in which an electric double layer capacitor is wound around the core 310 at the center thereof. The electrode element 300 functions to store and discharge electric energy substantially. The electrode element 300 is electrically insulated from the core 310 provided at the center by a metal material or a plastic material and may be electrically insulated from the inner side surface of the case 200.

2, the electrode device 300 according to the present invention includes a positive electrode plate 340, a negative electrode plate 350, and a separator 330. The electrode plate 300 is wound around the core 310, Lt; / RTI > A plate structure in which a separator 330 is disposed on the upper side and then an anode plate 350 and a separator plate 340 after the separator 330 are wound around the core 310 to form an electrode assembly 300, Lt; / RTI > Here, the separator 330 may be a structure that allows the electrolyte to permeate while electrically insulating the positive electrode plate 340 and the negative electrode plate 350 from each other.

In addition, the electrode element 300 may include a first cover 360 covering the wound cylindrical top by a predetermined height, and a second cover 370 covering the bottom of the first cover 360 by a predetermined height. The first cover 360 is in contact with at least one positive electrode plate 340 of the wound cylindrical electrode element 300, for example, above the positive electrode plate 340, and the second cover 370 is wound around the wound cylindrical electrode element 300 300, for example, an upper portion of the negative electrode plate 350. The negative electrode plate 350 is formed of a metal such as aluminum. In this process, the contact between the positive electrode plate 340 and the negative electrode plate 350 may be formed by laser welding or the like. As a result, the first cover 360 serves as a positive electrode lead of the electrode device 300, and the second cover 370 serves as a negative electrode lead of the electrode device 300. Or may act as an opposite polarity lead depending on the design method of the designer or the arrangement of the electrode elements 300.

The wound cylindrical electrode element 300 is formed so that the upper end of the positive electrode plate 340 protrudes upward from the negative electrode plate 350 and the lower end of the negative electrode plate 350 protrudes downward from the positive electrode plate 340, It may be a plate material structure which is laminated in a twisted form. The first lid 360 formed on the wound cylindrical electrode element 300 can be more easily contacted or welded to the positive electrode plate 340 and the second lid 370 can be easily contacted or welded to the negative electrode plate 350, To be welded or welded.

Referring to FIGS. 1 and 3 again, the upper cover 110 may be provided in a disc shape having a predetermined thickness as shown in the drawing, and may have a stronger electrical contact with the electrode element 300 disposed inside the case 200 A certain number of contact grooves 112 may be provided with reference to the center line as shown. Since the contact grooves 112 are formed in a protruding form internally of the upper cover 110, the contact grooves 112 have a contact protrusion shape when viewed from the inside of the upper cover 110. The contact protrusions generated by the contact groove 112 are in electrical contact with the upper end of the electrode element 300, for example, the first cover 360. Meanwhile, the coupling groove 111 disposed at the center of the upper cover 110 is also provided in the shape of a circular protrusion when viewed from the inner side of the upper cover 110, and the circular protrusion is also provided at the upper end of the electrode element 300 And contacts the first cover 360 to serve as an electrode.

The contact grooves 112 of the upper cover 110 are arranged at intervals of 120 degrees with respect to the coupling groove 111 arranged at the center as shown in the figure. The number and arrangement of the contact grooves 112 are provided to stably support the contact of the electrode element 300 with the first cover 360. According to the designer's intention, It is possible. As the contact groove 112 is provided, the peripheral region of the upper cover 110 is protruded from the contact groove 112. The upper cover 110 may be formed of a metal material and may serve as a first polarity terminal through contact with the electrode element 300. For example, the upper cover 110 may be formed of a variety of metals or the like made of a material having high electrical conductivity, such as copper, aluminum, or an alloy thereof.

The lower cover 120 may be provided in the same shape as the upper cover 110. That is, when the upper cover 110 is disposed to close the front opening of the case 200 through which the front and rear surfaces pass, the lower cover 120 may be arranged to close the rear opening of the case 200. Similar to the upper cover 110, the lower cover 120 is also provided with a coupling groove at the center thereof, and the contact grooves can be arranged at a certain angle in the radial direction around the coupling groove. The contact recesses of the lower cover 120 may be in electrical contact with the second cover 370 provided on the electrode element 300. [ And the coupling groove of the lower cover 120 is also in contact with the central portion of the electrode element 300.

Meanwhile, the lower cover 120 may be provided as a part of the case 200. In this case, the lower cover 120 may have a shape different from that of the upper cover 110. When the lower cover 120 is provided as a part of the case 200, the lower cover 120 may be a part of the bottom surface of the case 200. In this case, the lower cover 120 may not have a separate fastening groove or a contact groove, and may serve as a ground terminal while only forming one surface of the case 200.

The connection structure 400 is inserted into a coupling groove 111 provided at the center of the upper cover 110 or the lower cover 120 provided in the electric energy storage device 10 to facilitate connection with other devices such as a bus bar In order to perform the operation. 3, the connection structure 400 according to the embodiment of the present invention may be arranged so that the auxiliary terminal 420 and the terminal 410 are fixed to the coupling groove 111 while being coupled to each other .

The terminal 410 is made of a metal material capable of heat welding, arc welding, or laser welding, and is seated in the fastening groove 111. The terminal 410 includes a terminal body 412 and a through hole 411 formed at the center of the terminal body 412, and is provided in a ring-like cylindrical shape or a cylindrical shape. The through hole 411 is formed to have a smaller diameter than the fastening hole 429 formed in the auxiliary terminal 420 so that the auxiliary terminal 420 can be fastened to the terminal 410 by bolts or screws. In this case, a thread may be formed on the inner peripheral surface of the through hole 411. The bolt or the screw inserted into the through hole 411 is inserted into the fastening hole 429 of the auxiliary terminal 420 in order to support the screw connection of the auxiliary terminal 420 inserted into the outside of the fastening hole 429 and the terminal 410. [ And a header portion having a larger diameter. On the other hand, if the connecting structure 400 does not support the screwing between the terminal 410 and the auxiliary terminal 420, threading may be excluded from the inner peripheral surface of the through hole 411.

The entire diameter of the terminal 410 may have the same diameter as the diameter of the fastening groove 111. The terminal 410 is inserted and welded into the fastening groove 111 formed at the center of the upper cover 110 of the electric energy storage device 10. The welding method may be performed by heating or arc welding as described above, but laser welding may be used to prevent breakage of the electrode element 300 inserted into the case 200.

The height of the terminal 410 may be greater than the depth of the fastening groove 111. Thus, when the terminal 410 is inserted into the fastening groove 111 and then welded and fixed, the upper end of the terminal 410 is arranged to protrude from the opened upper surface of the fastening groove 111. The height of the upper end of the terminal 410 projecting from the upper surface of the coupling groove 111 is set to be greater than or equal to the thickness of the plate member having the coupling hole 429 formed in the auxiliary terminal 420 to support the coupling with the auxiliary terminal 420 As shown in FIG. The height of the upper end of the terminal 410 protruding from the upper surface of the coupling groove 111 when the terminal 410 and the auxiliary terminal 420 are screwed is larger than the thickness of the plate member formed with the coupling hole 429 of the auxiliary terminal 420 Or may be formed to be equal to or less than the thickness. The upper end of the terminal 410 is not formed below the upper surface of the coupling groove 111 even if the upper end of the terminal 410 is formed to be less than the thickness of the plate member.

The terminal 410 of the present invention further includes a nut portion and a weld portion formed with a hole passing through the center. The nut portion is inserted into the lower portion of the fastening groove 111, and the weld portion is inserted into the fastening groove 111 However, it may be inserted into the upper part of the nut and welded. In this case, the terminal 410 passes through the hole formed at the center of the welded portion, and a bolt or a screw is inserted, and the inserted bolt or screw can be screwed to the nut portion. In this process, the bolt or screw insertion is inserted after the auxiliary terminal 420 is inserted into the terminal 410, thereby assisting the auxiliary terminal 420 to be firmly fixed to the terminal 410. Then, the welding process is performed in a state where the welding portion and the auxiliary terminal 420 are fastened to support the welding of the auxiliary terminal 420 and the terminal 410. Welding of the terminal 410 and the auxiliary terminal 420 using the welding portion located at the upper portion of the nut portion can be performed independently or in parallel with the above-described screw connection.

The auxiliary terminal 420 includes a first connection portion 421 connected to the terminal 410, a second connection portion 423 extended upward at a predetermined angle from the edge of the first connection portion 421, And a third connection part 425 extending in a predetermined direction in a top edge area of the first connection part 423.

The first connection portion 421 is formed of a rectangular or square plate member, and a coupling hole 429 for coupling with the upper end of the terminal 410 is formed at the central portion. For this purpose, the diameter of the fastening hole 429 may be the same as or similar to the diameter of the terminal 410. The thickness of the plate of the first connection part 421 may be equal to or less than the height of the upper end protruded from the coupling groove 111 according to the coupling method with the terminal 410, . That is, as described above, when the upper ends of the first connection part 421 and the terminal 410 are laser-welded, the thickness of the first connection part 421 is formed to be smaller than the upper end part of the terminal 410, It can be designed to have a strong durability against the applied physical force.

When the first connection part 421 and the terminal 410 are screwed together, the thickness of the first connection part 421 is equal to or greater than the height of the upper end of the terminal 410, And terminal 410 with sufficient force. That is, the terminal 410 may be provided so that the upper end protruding from the coupling groove 111 does not protrude from the upper surface of the first connection portion 421 in order to prevent lifting during screwing. Meanwhile, the overall size of the first connection part 421 may be formed to have a size that does not deviate in the lateral direction from the front surface of the upper cover 110. For example, the first connection part 421 may be formed to have a certain area larger than the size of the coupling groove 111 have.

The second connection portion 423 is configured to separate the third connection portion 425 from the first connection portion 421 at a predetermined interval. The second connection portion 423 having such a configuration may be vertically extended from the first connection portion 421 and may be extended with a predetermined slope depending on the designing method. The second connection portion 423 is formed so as to have a vertical width equal to the vertical width of the first connection portion 421 because the second connection portion 423 extends in series with the first connection portion 421. The height of the second connection portion 423 may be set to have a predetermined length depending on the designing method. The height of the second connection portion 423 may be determined depending on the environment in which the electric energy storage device 10 is to be used, And can be provided in various forms. On the other hand, although not shown, holes further extending through the front and rear surfaces of the elongated second connection portion 423 may be further provided. The holes passing through the front and rear surfaces of the second connection portion 423 support a bus bar or the like to be fastened to the second connection portion 423. As a result, the auxiliary terminal 420 having the holes formed in the second connection part 423 and the third connection part 425 can support the bus bar to be fastened to the required place according to the work style and demands of the operator.

The third connection portion 425 is extended from the upper edge of the second connection portion 423 and is electrically connected to a bus bar, an electronic device or the like. Since the third connection portion 425 extends from the second connection portion 423, the third connection portion 425 is formed to have the same width as that of the second connection portion 423. The third connection portion 425 may be extended in a direction parallel to the first connection portion 421. Although the third connection portion 425 is provided to face the first connection portion 421 in the drawing, the third connection portion 425 may be formed in other forms according to the design method. Meanwhile, a connection hole 426 may be formed in the third connection part 425 of the present invention for screw connection with a bus bar or the like. The connection holes 426 are aligned with the screw holes formed in the bus bars, and threads may be formed so that screws or the like are screwed. The diameter of the connection hole 426 is formed to have the same diameter as the screw connection hole formed in the bus bar. That is, the diameter of the connection hole 426 is formed to have a diameter corresponding to the diameter of the insertion portion of the screw or bolt used.

As described above, the connection structure 400 of the present invention includes the terminal 410 to be fastened to the fastening groove 111 of the electric energy storage device 10, and the terminal 410 to be fastened to the fastening groove 111, The electric energy storage device 10 can be fastened to the bus bar or the electronic device through the auxiliary terminal 420 without being directly fastened thereto. Accordingly, the connection structure 400 of the present invention prevents the physical pressure or the high temperature environment applied during the fastening process from being directly provided to the electric energy storage device 10, Is protruded from the cover of the electric energy storage device 10 by a predetermined height. Such a fastening environment not only facilitates connection of the bus bar or the electronic device to the electric energy storage device 10, but also facilitates securing a space for using the tool necessary for the connection process.

1 and 3, the position of the connection structure 400 is described as the upper cover 110, but the present invention is not limited thereto. That is, the description of the upper cover 110 may be applied to the lower cover 120 as well.

Figure 4 illustrates one form of bus bar and other forms of auxiliary terminal 420 of connection structure 400 according to an embodiment of the present invention.

Referring to FIG. 4, the auxiliary terminal 420 of the present invention is formed such that the fourth connection portion 427 is formed so as not to face the first connection portion 421 as shown at 401. The auxiliary terminal 420 includes a first connection part 421 formed with a fastening hole 429 to be inserted into a terminal 410 to be inserted into the fastening groove 111 of the cover 110, A second connecting portion 423 extending from one edge of the first connecting portion 421 to the first connecting portion 421 with a predetermined angle or angle and a second connecting portion 423 extending from the upper edge of the second connecting portion 423 And a fourth connecting portion 427 extending vertically or at a predetermined angle. Particularly, the fourth connection portion 427 is disposed in a direction opposite to the position where the first connection portion 421 is disposed with respect to the second connection portion 423.

A connection hole 426 is formed at the center of the fourth connection portion 427 for screw connection with the bus bar 500 or other auxiliary terminal. The connection hole 426 formed in the fourth connection portion 427 may be aligned with the screw hole or the connection hole formed in the bus bar 500 or other auxiliary terminal and then coupled with the bus bar 500 according to the screw insertion . For this purpose, threads may be formed on the inner peripheral surface of the connection hole 426.

The auxiliary terminal 420 having such a configuration may support the connection between the electric energy storage devices 10 without adding a separate bus bar 500 device. The auxiliary terminal 420 connected to the terminal 410 fixedly inserted into the coupling groove 111 of the cover 110 of the specific electric energy storage device 10 is connected to the auxiliary terminal 420 disposed in the other electric energy storage device 10, (Not shown). To this end, the height of the second connection of the first auxiliary terminal arranged in the specific electric energy storage device, for example the first electric energy storage device, and the height of the second auxiliary terminal, which is arranged in the second electric energy storage device connected to the first electric energy storage device The heights of the second connection portions may be different from each other. The height of the second connection portion of the first auxiliary terminal may be greater or smaller than the height of the second connection portion of the second auxiliary terminal so that the fourth connection portions overlap each other. On the other hand, the fourth connection portions may be formed to have a length equal to or longer than the radius of the cover, so that the fourth connection portions overlap each other. The center distance of the connection hole 426 of the fourth connection part 427 from the center of the connection hole 429 of the first connection part 421 assumed to be disposed on the same plane is equal to the radius of the cover 110 . Accordingly, when the fourth connection part of the first electric energy storage device and the fourth connection part of the second electric energy storage device are aligned with each other, the connection holes are aligned, and a bolt, a screw or the like is inserted into the above- They can be connected to each other. This structure can be used in a structure that connects two electric energy storage devices 10. In addition, the second connection portion 423 is provided with a connection hole passing through the front and rear surfaces, and can be coupled to the bus bar or the like through a screw connection.

Meanwhile, the auxiliary terminal 420 of the present invention may be formed to include only the first connection part 421 and the second connection part 423 as shown in 403. The first connection part 421 has a fastening hole 429 which is inserted and fixed to the upper end of the terminal 410 inserted and fixed into the fastening groove 111 of the electric energy storage device 10.

The second connection portion 423 extends from the edge region of the first connection portion 421 perpendicularly or at an angle to the first connection portion 421. The second connection portion 423 has a connection hole 426 formed at the center thereof. A screw hole 502 formed in the bus bar 500 or the like is aligned in the connection hole 426 and a screw or a bolt is inserted to connect the second connection portion 423 to the bus bar 500. At this time, the bus bar 500 is vertically disposed in the longitudinal direction and contacts the front or rear surface of the second connection portion 423 extending vertically to the first connection portion 421, and the screw connection hole 502 and the connection hole 426 Can be screwed together in an aligned state. The fourth connection part 427 and the second connection part 423 are provided to support the screw connection using the connection holes 426. The fourth connection part 427 and the second connection part 423, (423) may be welded to a bus bar or a device using laser welding or the like.

The configuration shown at 405 is the bus bar 500. The bus bar 500 is provided with a bar type bus body 501 having a predetermined width, length and thickness and screw holes 502 formed at both side edges of the bus body 501. The bus body 501 is arranged in the longitudinal direction so that the screw hole at one end is fastened to the auxiliary terminal fastened to the terminal of the first electric energy storage device and the screw hole provided at the other end is fastened to the terminal of the second electric energy storage device And is fastened to the clamped auxiliary terminal to support electrical connection of a plurality of electric energy storage devices. In particular, when three or more electric energy storage devices are connected, a plurality of the bus bars 500 may be provided, and connection between the bus bars 500 may be performed. For example, auxiliary terminals provided in a specific electrical energy storage device may be screwed or coupled by laser welding to a plurality of bus bars 500.

5 is a view illustrating a method of manufacturing an electric energy storage device assembly having a connection structure according to an embodiment of the present invention.

Referring to FIG. 5, a method of manufacturing an electric energy storage device assembly according to an embodiment of the present invention includes providing an electric energy storage device 10 having a coupling groove 111 formed at the center of a cover 110 in step S101. The engaging groove 111 may be provided in a cylindrical engraved shape. And the engaging groove 111 can serve as a terminal of a specific polarity of the electric energy storage device 10. [

Next, in step S103, the terminal 410 is placed in the fastening groove 111 and welding is performed. In this step, the terminal 410 is made of a weldable material. After the terminal 410 is inserted into the fastening groove 111, laser welding is performed to fix the terminal 410 to the fastening groove 111. The terminal 410 inserted into the fastening groove 111 may have a cylindrical shape with a through hole 411 formed at the center thereof. The height of the terminal 410 is greater than the depth of the coupling groove 111. When the terminal 410 is inserted and fixed in the coupling groove 111, the terminal 410 is disposed at one end of the upper end protruding from the upper surface of the coupling groove 111.

The first connection part 421 of the auxiliary terminal 420 having the fastening hole 429 formed therein is aligned with the protruded upper end of the terminal 410 and inserted. The protruded upper end outer circumferential surface of the terminal 410 may be disposed in contact with the inner circumferential surface of the fastening hole 429 of the auxiliary terminal 420. [ Here, the terminal 410 and the auxiliary terminal 420 can be fixed by performing laser welding on the upper end of the fastening hole 429 and the terminal 410.

In addition, the bus bar 500 or one end of the electric device provided separately is connected to the auxiliary terminal 420 in step S107. The screw connection holes 502 formed on both side edges of the bus bar 500 are aligned with the connection holes 426 formed on one side of the auxiliary terminal 420 and are screwed into the screw holes 502 And supports the auxiliary terminal 420 and the bus bar 500 by screwing through the connection hole 426. Hereinafter, the present invention may assist in aligning the screw holes 502 and the connection holes 426 of the auxiliary terminal 420 and the bus bar 500 and welding them using laser welding. At this time, the screw engagement hole 502 and the connection hole 426 can be used as an alignment mark.

As described above, according to the electric energy storage device assembly including the connection structure of the present invention and the manufacturing method thereof, the terminal 410 of the connection structure 400 is connected to the coupling groove 111 of the electric energy storage device 10 And the auxiliary terminal 420 connected to the terminal 410 is used to connect the bus bar 500 to the electric device or to connect the bus bar 500 in series or in parallel between the electric energy storage devices. To make it easier. Particularly, the auxiliary terminal 420 of the present invention protrudes from the surface of the cover 110 of the electric energy storage device 10 so that the auxiliary terminal 420 can be connected to the bus bar 500 by laser welding or screw connection. It is possible to easily secure the work space.

While the present invention has been described with reference to several preferred embodiments, these embodiments are illustrative and not restrictive. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit of the invention and the scope of the appended claims.

10: electric energy storage device 110: upper cover
120: lower cover 200: case
300: electrode element 310: core
400: connection structure 410: terminal
420: auxiliary terminal 426: connection hole
429: fastening hole 111: fastening groove
500: Bus bar 502: Screw connection hole

Claims (13)

An electric energy storage device having a coupling groove formed at the center of the cover;
A terminal inserted and fixed in the fastening groove and weldable;
An auxiliary terminal coupled to the terminal and supporting a connection with a separate device at a position spaced apart from the cover of the electric energy storage device;
Wherein the electrical energy storage assembly comprises a connection structure. The method according to claim 1,
The terminal
A through hole formed at the center;
And a terminal body having a cylindrical ring shape and forming the through hole,
Wherein the diameter of the terminal body is the same or similar to the diameter of the coupling groove. The method according to claim 1,
The terminal
Wherein the coupling structure is formed to have a height that is greater than a depth of the coupling groove and is disposed such that an upper end protrudes from an upper surface of the coupling groove when the coupling structure is inserted and fixed in the coupling groove. The method of claim 3,
The auxiliary terminal
A first connection part having a fastening hole inserted into an upper end of the projected terminal and fastened to the terminal through at least one of laser welding and screwing;
A second connection unit connected to the first connection unit and extending perpendicularly or at an angle to the first connection unit;
A third connection portion extending perpendicularly to the second connection portion or having a predetermined angle, the third connection portion being disposed to face the first connection portion;
Wherein the electrical energy storage assembly includes a connection structure. The method of claim 3,
The auxiliary terminal
A first connection part having a fastening hole inserted into an upper end of the projected terminal and fastened to the terminal through at least one of laser welding and screwing;
A second connection unit connected to the first connection unit and extending perpendicularly or at an angle to the first connection unit;
A fourth connection part extending perpendicularly to the second connection part or having a predetermined angle and being arranged to be symmetrical with respect to the first connection part with respect to the second connection part;
Wherein the electrical energy storage assembly includes a connection structure. 6. The method according to any one of claims 4 to 5,
The second connection portion
A connecting hole provided at the center so as to enable screwing;
Wherein the electrical energy storage assembly comprises a connection structure. 6. The method according to any one of claims 4 to 5,
At least one of the third connection portion and the fourth connection portion
A connection hole provided so as to penetrate the front and rear surfaces;
Wherein the electrical energy storage assembly comprises a connection structure. The method of claim 3,
The auxiliary terminal
A first connection part having a fastening hole inserted into an upper end of the projected terminal and fastened to the terminal through at least one of laser welding and screwing;
A second connection part connected to the first connection part and extending vertically or at an angle to the first connection part and having a connection hole provided at the center so as to penetrate the front and rear surfaces;
Wherein the electrical energy storage assembly includes a connection structure. The method according to claim 1,
A bus bar connected to at least one of a connection hole formed in the auxiliary terminal and a screw connection or a welding connection;
Further comprising a connection structure. ≪ Desc / Clms Page number 20 > Providing an electrical energy storage device having a coupling groove formed at the center of the cover;
A step fixing step of arranging and fixing a terminal formed of a material weldable to the fastening groove;
A connecting step of connecting an auxiliary terminal supporting the connection with another device to the terminal at a position spaced apart from the cover by a predetermined distance;
Wherein the electrical energy storage device assembly comprises a connection structure. 11. The method of claim 10,
The fixing step
Laser welding the terminal so that a portion of the upper end protrudes from the fastening groove;
Wherein the electrical energy storage device assembly comprises a connection structure. 11. The method of claim 10,
The connecting step
Aligning a fastening hole provided at one end with a protruded upper end of the terminal;
Laser welding and fixing the coupling hole and the upper end of the terminal;
Wherein the electrical energy storage device assembly comprises a connection structure. 11. The method of claim 10,
Aligning one side of a bus bar in a connection hole formed in the auxiliary terminal and screwing the bus bar into a connection hole of the auxiliary terminal;
Aligning one side of the bus bar in a connection hole formed in the auxiliary terminal and joining the bus bar to one end of the auxiliary terminal with the connection hole formed by laser welding;
The method further comprising at least one of the following steps:

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