KR20230000357A - Electric energy storage device comprising electrode lead in rivet bolt - Google Patents

Abstract

The present invention relates to an electric energy storage device comprising an electrode lead coupled with a rivet bolt. More specifically, the present invention relates to an electric energy storage device comprising an electrode lead coupled with a rivet bolt. The electric energy storage device comprising an electrode lead coupled with a rivet bolt includes: a sheet consisting of a positive electrode, a negative electrode, and a separator; a positive electrode terminal connected to the positive electrode of the sheet and formed on one side; a negative electrode terminal connected to the negative electrode of the sheet and formed on the other side; internal electrode leads connected to the positive and negative electrode terminals, respectively, and located on upper and lower surfaces of the sheet; a pouch film installed in contact with the internal electrode leads and then coupled to the same to form an electric energy storage device; external electrode leads bonded to both upper and lower surfaces of the electric energy storage device and transmitting electricity generated in the sheet to the outside; a rivet coupled through holes provided in the internal electrode leads, pouch film, and external electrode leads; and a bolt installed on the rivet so that the adjacent electric energy storage device is fixed. According to the present invention, heat generated from the inside of the electric energy storage device is dissipated by a heat dissipation member.

Description

Electric energy storage device comprising electrode lead in rivet bolt

The present invention relates to an electrical energy storage device having electrode leads coupled with rivet bolts, and more specifically, an internal electrode lead, an external electrode lead, and a pouch film are joined with a rivet, but a bolt is installed on the rivet to store electrical energy at low pressure. The present invention relates to an electrical energy storage device having electrode leads coupled with rivet bolts capable of stacking the storage devices, thereby reducing contact resistance and stably stacking the storage devices.

In general, an energy storage device refers to a device that stores electrical energy inside and supplies it to the outside when necessary. Among energy storage devices, electrical energy storage devices using electrochemical reactions typically include batteries and capacitors.

Here, the battery generates electricity through the oxidation-reduction reaction of lithium ion in the case of a lithium ion battery and can charge and discharge power slowly for a long time, and a capacitor has high power density but low energy density and can output high power at once. However, the charging/discharging time is very fast.

On the other hand, supercapacitors are located in the middle of conventional capacitors and batteries, and can store a large amount of energy compared to conventional capacitors while generating a much higher output than batteries. A supercapacitor is an energy storage device that stores a lot of energy by using simple ion movement between electrode and electrolyte interface or charging phenomenon by surface chemical reaction and then emits high energy for tens of seconds to minutes. It is also called an ultra capacitor. do.

The electric energy storage device as described above is mainly cylindrical, coin-shaped, or pouch-shaped. Here, the pouch-type electrical energy storage device has a structure in which an electrode assembly capable of charging and discharging is sealed inside an exterior material, and an electrode lead electrically connected to the electrode assembly protrudes from the exterior material to transmit current.

Here, when the electrical energy storage device has an internal electrode lead, a pressurization process is required when stacking the electrical energy storage device due to a step difference between the exterior material and the internal electrode lead. Since the pressure process may cause damage to electrode leads, a technique for stacking electric energy storage devices even at low pressure is required.

As the prior art, Korean Patent Publication No. 10-2018-0104953 "pouch-type secondary battery" is described. The technology includes an electrode assembly in which an anode, a separator, and a cathode are alternately stacked, and each electrode has a lead protruding outward; and a pouch case having an accommodating portion capable of accommodating the electrode assembly, wherein a lead protrusion direction of the positive electrode and a lead protrusion direction of the negative electrode form a right angle to each other, suggesting a pouch-type secondary battery. .

Such technology has problems in that the pressurization process cannot be performed at a low pressure, the contact force of the electrical energy storage device is low, and the electrical energy storage device is disturbed when stacked.

Therefore, the present invention has been proposed to improve such conventional problems, and more specifically, an internal electrode lead, an external electrode lead, and a pouch film are combined with a rivet, but a bolt is installed on the rivet to provide an electrical energy storage device at low pressure. An object of the present invention is to provide an electrical energy storage device having electrode leads coupled with rivet bolts that can be stacked, thereby reducing contact resistance and stably stacking.

In order to solve the above problems, an electrical energy storage device having electrode leads coupled by rivet bolts according to a first embodiment of the present invention includes a sheet composed of an anode, a cathode, and a separator; a positive electrode terminal connected to the positive electrode of the sheet and formed on one side; a negative electrode terminal connected to the negative electrode of the sheet and formed on the other side; Internal electrode leads connected to the positive terminal and the negative terminal, respectively, and located on the upper and lower surfaces of the sheet; a pouch film installed in contact with the internal electrode leads and coupled to each other to form an electrical energy storage device; external electrode leads bonded to both upper and lower surfaces of the electrical energy storage device to transmit electricity generated in the sheet to the outside; A rivet coupled to the internal electrode lead, the pouch film, and the external electrode lead through holes provided therein, and a bolt installed on the rivet to fix an adjacent electric energy storage device may be included.

In addition, the rivet is formed to be spaced apart at a predetermined interval on one surface and is formed to cross the rivet formed on the other surface on the other surface, and includes a head and a body so as to be closely coupled to the external electrode lead, and the head is directed to the inside of the center Doedoe formed, a screw groove is provided along the inner circumferential surface may include a nut groove to be coupled with the bolt.

In addition, the bolt includes a bolt head and a bolt shaft having a thread formed on an outer circumferential surface, and the bolt shaft extends downward from the first bolt shaft formed to have a length in a vertical direction at the lower end of the bolt head and the first bolt shaft. and a second bolt shaft formed and screwed into the nut groove, wherein the bolt head is inserted between the pair of first bolt shafts when adjacent electrical energy storage devices are stacked.

In addition, the first bolt shaft is characterized in that it is formed larger than the diameter of the nut groove to widen the contact area with the rivet.

In addition, the bolt head may include a head protrusion formed along an outer circumferential surface, and the first bolt shaft may include a shaft protrusion formed along the outer circumferential surface to come into contact with the head protrusion when adjacent electric energy storage devices are stacked. there is.

In addition, the head of the electrical energy storage device having electrode leads coupled with rivet bolts according to the second embodiment of the present invention is buried in the hole of the external electrode lead to reduce the distance between the electrical energy storage devices. do.

In addition, the electric energy storage device having electrode leads coupled with rivet bolts according to the third embodiment of the present invention is formed on both upper and lower surfaces of the electric energy storage device so that heat generated inside the electric energy storage device is discharged. Further comprising a heat dissipation member, wherein the heat dissipation member has comb-shaped first protrusions formed spaced apart at a predetermined interval along one side of one of the upper and lower surfaces of the electric energy storage device, and the first protrusion on the other side. It is characterized in that the second protrusion formed along the other side to correspond to the formation.

According to an embodiment of the present invention, an electrical energy storage device having electrode leads coupled with rivet bolts may stack the electrical energy storage devices at a low pressure by combining internal electrode leads, external electrode leads, and a pouch film with rivets.

In addition, bolts are installed on the rivets to prevent the electric energy storage device from being disturbed during stacking.

In addition, as the pressure of the pressing process is increased, the contact resistance may be lowered.

In addition, heat generated inside the electric energy storage device may be dissipated through the heat dissipation member.

In addition, the first protrusion and the second protrusion are engaged and coupled in a sliding manner to increase the fixing force between the electrical energy storage devices.

In addition, the effects according to the embodiments of the present invention mentioned above are not limited to the described content, and may further include all effects predictable from the specification and drawings.

1 (a) and (b) are a perspective view and a bottom perspective view of an electric energy storage device having electrode leads coupled with rivet bolts according to an embodiment of the present invention.
Figure 2 (a) and (b) is a cross-sectional view and a cross-sectional view of the bolt separation taken along line A-A 'of Figure 1.
FIG. 3 is a side view illustrating a state in which the electrical energy storage device of FIG. 1 is stacked;
Figure 4 (a) and (b) is an exemplary view showing a state in which the bolt of Figure 1 is formed in another form.
Figure 5 (a) and (b) is an exemplary view showing a state in which the diameter of the first bolt shaft of Figure 1 is formed larger than the nut groove.
Figure 6 (a) and (b) is an exemplary view showing a state in which protrusions are formed on the bolt of FIG.
FIG. 7 is a side view illustrating a state in which the electrical energy storage device of FIG. 6 is stacked;
8 (a) and (b) are a perspective view and a bottom perspective view of an electric energy storage device having electrode leads coupled by rivet bolts according to a second embodiment of the present invention.
Figure 9 (a) to (c) is an exemplary view showing a state in which the rivet of Figure 8 is coupled.
Figure 10 (a) and (b) is a cross-sectional view and a cross-sectional view of the bolt separation taken along line BB 'of Figure 8.
FIG. 11 is a side view illustrating a state in which the electrical energy storage device of FIG. 8 is stacked.
12 (a) and (b) are a perspective view and a bottom perspective view of an electric energy storage device having electrode leads coupled with rivet bolts according to a third embodiment of the present invention.
13(a) to (c) are exemplary diagrams showing how the electrical energy storage device of FIG. 11 is coupled.

Hereinafter, the description of the present invention with reference to the drawings is not limited to specific embodiments, and various transformations may be applied and various embodiments may be applied. In addition, the content described below should be understood to include all conversions, equivalents, or substitutes included in the spirit and scope of the present invention.

In the following description, terms such as first and second are terms used to describe various components, and are not limited in meaning per se, and are used only for the purpose of distinguishing one component from another.

Like reference numbers used throughout this specification indicate like elements.

Singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "include", "include" or "have" described below are intended to designate that features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist. should be construed, and understood not to preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Prior to describing the present invention, the electrical energy storage device described in the present invention may be configured in various shapes that are not limited to, such as a prismatic shape, a pouch shape, and a cylindrical shape.

In addition, the electrical energy storage device may use various electrical energy storage cells capable of storing electrical energy, such as supercapacitor cells, lithium ion battery cells, and lithium ion capacitor cells, but in the present invention, pouch-type battery cells formed in the form of pouches will be explained based on

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 13 attached.

1 (a) and (b) are perspective and bottom perspective views of an electrical energy storage device having electrode leads coupled with rivet bolts according to an embodiment of the present invention, and FIG. 2 (a) and (b) are 1, Figure 3 is a side view showing the electrical energy storage device of Figure 1 is stacked, Figure 4 (a) and (b) of Figure 1 It is an exemplary view showing a state in which a bolt of another type is formed, and FIGS. 5 (a) and (b) are exemplary views showing a state in which the first bolt shaft of FIG. 1 has a larger diameter than the nut groove, and FIG. 6 (a) and (b) are exemplary views showing a state in which protrusions are formed on the bolts of FIG. 1 , and FIG. 7 is a side view illustrating a state in which the electrical energy storage device of FIG. 6 is stacked.

1 to 7, the electrical energy storage device 1 having electrode leads coupled with rivet bolts according to the present invention includes a sheet 10, a positive terminal 20, a negative terminal 30, and an internal electrode lead. (40), a pouch film (50), an external electrode lead (60), a rivet (70), and a bolt (80).

First, the sheet 10 is composed of an anode, a cathode, and a separator, and may be formed of a sheet 10 commonly used in the art to which the present invention belongs. The shape of the sheet 10 may be formed in a stack type, a jelly roll type, a stack and folding type, or a Z-folding type, It is not limited to this.

A positive electrode is a positive electrode current collector coated with a positive electrode active material, and a negative electrode is a negative electrode active material coated. The positive electrode current collector and the negative electrode current collector may generally have a thickness of 3 to 500 μm.

The separation membrane is not particularly limited as long as it is commonly used in the technical field to which the present invention belongs. For example, a multilayer film formed of PE, PP, or a combination thereof having a microporous structure, or a polymer film for a solid polymer electrolyte or a gel polymer electrolyte may be used.

The positive terminal 20 may be connected to the positive electrode of the sheet 10 and protrude on one side, and the negative electrode terminal 30 may be connected to the negative electrode of the sheet 10 and protrude on the other side.

The internal electrode lead 40 is formed in the form of a thin plate, connected to the positive terminal 20 and the negative terminal 30, respectively, and may be positioned on both upper and lower surfaces of the sheet 10. At this time, the internal electrode lead 40 connected to the positive terminal 20 has a positive electrode, and the internal electrode lead 40 connected to the negative terminal 30 has a negative electrode.

Specifically, when the internal electrode lead 40 connected to the positive terminal 20 is located on the upper surface of the sheet 10, the internal electrode lead 40 connected to the negative terminal 30 is located on the lower surface of the sheet 10 can do. In addition, the internal electrode lead 40 may be joined to the positive terminal 20 or the negative terminal 30 by welding such as ultrasonic welding, but is not limited thereto.

The pouch film 50 may be installed in contact with the internal electrode lead 40 and coupled to each other to form the electrical energy storage device 1 .

The material of the pouch film 50 is not particularly limited as long as it is commonly used in the technical field to which the present invention belongs. The pouch film 50 may be composed of a laminated multi-layer structure, a resin inner layer serving as a heat sealing layer, a substrate maintaining mechanical strength, a metal foil layer serving as a moisture and oxygen barrier layer, and a substrate and protective layer. External layers serving as may be sequentially laminated.

The external electrode leads 60 are bonded to both upper and lower surfaces of the electrical energy storage device 1, and can transmit electricity generated in the sheet 10 to the outside. Here, the outside may be an electronic device that is driven by receiving electricity or may be another electrical energy storage device (1).

In addition, the external electrode lead 60 is formed in a form exposed to the outside in order to electrically connect with the inner sheet 10, and an insulating film for protecting the external electrode lead 60 may be attached to the upper and lower surfaces.

Finally, the rivet 70 may penetrate and couple the internal electrode lead 40, the pouch film 50, and the external electrode lead 60, and for this purpose, the head portion 71 and the body 72 may be included. there is.

In general, a rivet is a rod-shaped connecting material used to permanently join metal materials, and metal materials with holes are overlapped, rivets are inserted by matching holes, and the heads are supported and fastened by beating with a machine.

Through the combination of these rivets 70, the electrical energy storage device 1 can combine the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 with a low pressure, and the pressure is further increased to Contact resistance between the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 may be reduced.

In addition, the rivets 70 are formed on both upper and lower surfaces of the electrical energy storage device 1, and may be formed to be spaced apart from each other at a predetermined interval on one surface and may be formed to cross each other with the rivets 70 formed on one surface on the other surface.

The head portion 71 is installed in contact with the outer surface of the external electrode lead 60 and may be formed to protrude outside. The head 71 can be formed in various shapes such as a round shape, a flat shape, a round dish shape, a pot shape, and a thin flat shape. However, it is not limited thereto.

In addition, the head portion 71 may include a nut groove 710 that is formed inside the center and is provided with a screw groove 7100 on the inner circumferential surface to be coupled with the bolt 80. The bolt 80 may be inserted into the nut groove 710 by a depth formed from the outside to the inside of the head 71 .

However, not limited thereto, the bolt 80 may be screwed according to the user's request within the depth range of the nut groove 710.

The body 72 is formed on the lower side of the head 71 and may be formed to have a length in a vertical direction. The lower end of the body 72 may be deformed in a horizontal direction by a pressing process and coupled thereto.

The material of the rivet 70 may allow current to flow normally by using the same material as the internal electrode lead 40 and the external electrode lead 60 . However, it is not limited thereto and can be used in various ways as a heat-resistant material capable of withstanding heat generated and transmitted from the inside and as a conductive material capable of transmitting current.

In addition, the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 fastened by the rivet 70 may have holes so that the rivets 70 may pass through the holes. However, it is not limited thereto.

For example, when the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 are combined in a state in which holes are provided only in the internal electrode lead 40 and the pouch film 50, the external electrode lead ( 60) can be rolled inside during the rivet 70 coupling process. Accordingly, current transfer efficiency may be increased.

In addition, since the diameter of the body 72 increases when the rivet 70 is coupled to the holes of the internal electrode lead 40, the pouch film 50, and the external electrode lead 60, the size of the body 72 of the rivet 70 increases. It is preferable to form slightly larger than the diameter.

Finally, the bolt 80 may include a bolt head 81 and a bolt shaft 82 to be coupled with the rivet 70 .

The bolt head 81 is formed in a cylindrical shape with a low height, and may be formed to have a larger diameter than the diameter of the bolt shaft 82.

Referring to (a) of FIG. 2, the bolt shaft 82 is formed on the lower side of the bolt head 81, and may be formed to have a length in the vertical direction. A screw thread 820 may be formed on the outer circumferential surface of the bolt shaft 82 so that it can be inserted into the nut groove 710 of the rivet 70 and screwed together.

Here, the screw thread 820 may be formed on the entire outer circumferential surface of the bolt shaft 82, but may be formed on a part of the outer circumferential surface without being limited thereto. This will be described in detail with reference to FIGS. 4 and 5 below.

In addition, the bolt shaft 82 may include a first bolt shaft 821 and a second bolt shaft 822 .

The first bolt shaft 821 may be formed to have a length in the vertical direction at the lower end of the bolt head 81, and the second bolt shaft 822 is formed to extend downward from the first bolt shaft 821, It can be inserted into the nut groove 710 and screwed together.

More specifically, as shown in (b) of FIG. 2, the second bolt shaft 822 of the bolt shaft 82 may be screwed into the nut groove 710 of the rivet 70, and the first bolt Shaft 82 is not inserted into the nut groove 710, and a separation distance may be formed between the head 71 of the rivet 70 and the bolt head 81.

In addition, adjacent electrical energy storage devices 1 may be stably stacked by coupling the first bolt shaft 821 and the bolt head 81 .

For example, rivets 70 are formed on the upper surface of the electrical energy storage device 1 so as to be spaced apart at regular intervals, and rivets 70 are formed on the lower surface alternately with the rivets 70 formed on the upper surface. Since the bolts 80 are coupled to the outside of the rivets 70, the bolts 80 are also arranged alternately on the upper and lower surfaces of the electrical energy storage device 1.

When a plurality of electrical energy storage devices 1 are stacked, a bolt 80 formed on the lower surface of the electrical energy storage device 1 located on the upper side and a bolt formed on the upper surface of the electrical energy storage device 1 located on the lower side (80) can be engaged in close contact with the sliding method.

Accordingly, as shown in FIG. 3 , the bolts 80 may be formed to cross each other on the upper and lower surfaces of the electrical energy storage device 1 . In addition, the bolt head 81 and the first bolt shaft 821 may be engaged and coupled, and the electric energy storage device 1 may be vertically positioned on a straight line and fixed in a vertical direction.

Here, the first bolt shaft 821 is preferably formed higher than the height of the bolt head 81 so that the bolt head 81 is inserted. However, it is not limited thereto.

Accordingly, the electric energy storage device 1 can be stably stacked without being disturbed by the bolt 80, and the contact area can be widened so that current can be efficiently transmitted to the adjacent electric energy storage device 1. .

In addition, the bolt shaft 82 is preferably formed smaller than the diameter of the nut groove 710 to be inserted into the nut groove 710. However, it is not limited thereto.

As the material of the bolt 80, a material such as the internal electrode lead 40, the external electrode lead 60, and the rivet 70 may be used to allow current to flow normally. However, it is not limited thereto and can be used in various ways as a heat-resistant material capable of withstanding heat generated and transmitted from the inside and as a conductive material capable of transmitting current.

Referring to (a) of FIG. 4 , the thread 820 may be formed only on the second bolt shaft 822 . As shown in (b) of FIG. 4, the second bolt shaft 822 may be inserted into and screwed into the nut groove 710. In addition, since the first bolt shaft 821 does not have a screw thread 820, screwing does not proceed any further, so that the bolt 80 can be fixed to the rivet 70 without shaking.

Specifically, when the screw thread 820 is formed on the entire bolt shaft 82, the second bolt shaft 822 is screwed into the nut groove 710 by the screw thread 820 leading to the first bolt shaft 821. The bolt 80 can wiggle. In addition, when a part of the first bolt shaft 821 is inserted into the nut groove 710 and the screwed electric energy storage device 1 is stacked, the bolt head 81 passes between the pair of first bolt shafts 821. Stacking of the electrical energy storage device 1 may be difficult because it is not inserted.

On the other hand, the bolt shaft 82 has a screw thread 820 formed only on the second bolt shaft 822 to increase the bonding force between the rivet 70 and the bolt 80 and maintains the height of the first bolt shaft 821. Stacking of the electrical energy storage device ( ) can be performed stably.

In addition, the first bolt shaft 821 is formed larger than the diameter of the nut groove 710 to increase the contact area with the rivet 70 .

More specifically, as shown in (a) of FIG. 5, the first bolt shaft 821 has a larger diameter than the second bolt shaft 822 and the nut groove 710, and the bolt head 81 and A diameter smaller than that of the head portion 71 may be formed. In addition, as shown in (b) of FIG. 5, after the second bolt shaft 822 is inserted into the nut groove 710 and screwed, the outer surface of the head 71 of the rivet 70 is the first It may be in contact with the lower surface of the bolt shaft 821. Accordingly, the contact area between the first bolt shaft 821 and the head of the rivet 70 is widened, so that the fixing force can be increased.

In addition, as shown in (a) of FIG. 6, the bolt 80 has a head protrusion 810 on the bolt head 81 to increase the contact force between the bolts 80 when adjacent electrical energy storage devices are stacked. The first bolt shaft 821 may include a shaft protrusion 8210 .

The head protrusion 810 may be formed along the outer circumferential surface of the bolt head 81, and the shaft protrusion 8210 is formed along the outer circumferential surface of the first bolt shaft 821, and the head protrusion 810 and the shaft protrusion 8210 ) can be interleaved by staggering positioning.

In addition, the first bolt shaft 821 may be formed to have a larger diameter than the nut groove 710 so that the shaft protrusion 8210 and the head protrusion 810 can contact each other. However, it is not limited thereto. In addition, as shown in (b) of FIG. 6, the second bolt shaft 822 may be screwed into the nut groove 710.

Referring to FIG. 7, when adjacent electric energy storage devices are stacked, the head protrusion 810 of the bolt head 81 and the shaft protrusion 8210 of the first bolt shaft 821 are staggered with each other to show a combined appearance. You can check. As a result, the contact force between the bolt shaft 82 and the bolt head 81 can be increased, the fixing force between the electrical energy storage devices 1 is improved, and the contact area is widened, so that more current can be supplied to the adjacent electrical energy storage devices 1. can be communicated effectively.

8 (a) and (b) are perspective and bottom perspective views of an electric energy storage device having electrode leads coupled with rivet bolts according to a second embodiment of the present invention, and FIG. 9 (a) to (c) is an exemplary view showing the state in which the rivet of FIG. 8 is coupled, FIG. 10 (a) and (b) are cross-sectional views and cross-sectional views of the bolt separation taken along line BB' of FIG. 8, and FIG. 11 is of FIG. It is a side view showing a state in which the electrical energy storage devices are stacked.

8 to 11, the head 71 of the electric energy storage device 1 having electrode leads coupled with rivet bolts according to the second embodiment of the present invention is inside the hole of the external electrode lead 60 can be landfilled.

Here, except for the head portion 71, the electric energy storage device 1 having the electrode leads coupled with the rivet bolts according to the second embodiment of the present invention has the rivet according to the first embodiment of the present invention described above. It can be said that it is substantially the same as the electrical energy storage device 1 having electrode leads coupled with bolts.

Therefore, only the head portion 71 will be described in detail.

The head part 71 may be buried inside through the hole of the external electrode lead 60 . The head portion 71 may be formed in the same shape as the hole of the external electrode lead 60 and coupled thereto.

For example, as shown in (a) of FIG. 9, the hole of the external electrode lead 60 is formed in a shape that narrows in diameter toward the pouch film 50 side, and the head portion 71 narrows toward the lower side. It can be formed into a shape and buried. As shown in (b) of FIG. 9, the rivet 70 may be inserted into the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 in this order.

Then, when the rivet 70 is pressed, as shown in (c) of FIG. 9, the lower end of the body 72 of the rivet 70 is molded to form the internal electrode lead 40, the pouch film 50 and An external electrode lead 60 may be coupled. In addition, after the surface of the head portion 71 is formed flat and embedded in the external electrode lead 60, it can be made to be flush with the external electrode lead 60.

After the bolt 80 is screwed into the head 71 of the rivet 70, as shown in FIG. A step difference between the lead 60 and the bolt 80 may be reduced. Accordingly, the thickness of the electrical energy storage device 1 is reduced, so that when a plurality of electrical energy storage devices 1 are stacked, the total stacking volume can be reduced.

12 (a) and (b) are perspective and bottom perspective views of an electric energy storage device having electrode leads coupled with rivet bolts according to a third embodiment of the present invention, and FIG. 13 (a) to (c) is an exemplary view showing how the electrical energy storage device of FIG. 11 is coupled.

12 and 13, the electric energy storage device 1 having electrode leads coupled with rivet bolts according to a third embodiment of the present invention includes a heat dissipation member 80 that dissipates heat generated therein. can include more.

Here, except for the heat dissipation member 80, the electrical energy storage device 1 having the electrode leads coupled with the rivet bolts according to the third embodiment of the present invention has the rivet according to the first embodiment of the present invention described above. It can be said that it is substantially the same as the electrical energy storage device 1 having electrode leads coupled with bolts.

Therefore, only the heat dissipation member 80 will be described in detail.

The heat dissipation member 80 dissipates heat generated inside the electrical energy storage device 1, and is formed on both upper and lower surfaces of the electrical energy storage device 1, and a first protrusion 91 is formed on one of them, A second protrusion 92 may be formed on the other one.

The first protrusions 91 are spaced apart at regular intervals along one side of the electrical energy storage device 1, and are formed in the shape of comb teeth, and the second protrusions are formed along the other side of the electrical energy storage device 1. It may be formed to correspond to the protrusion 91 .

For example, a heat dissipation member 90 having first protrusions 91 is formed on the upper surface of the electrical energy storage device 1, and a heat dissipation member 90 having second protrusions 92 is formed on the lower surface of the electrical energy storage device 1. can When a plurality of electrical energy storage devices 1 are stacked, the lower surface of the electrical energy storage device 1 located on the upper side, as shown in FIG. And the first protrusion 91 of the heat dissipating member 90 on the upper surface of the electrical energy storage device 1 positioned at the lower side may be engaged and engaged in a sliding manner. At this time, the first protrusion 91 is inserted into the groove between the second protrusions 92 and moves, and the second protrusion 92 moves in close contact with the groove between the first protrusions 91 . After that, the ends of the first projection 91 and the second projection may meet and be fixed to the inner surface of the heat dissipation member 90 to which they are coupled. As shown in (c) of FIG. 13, the pair of electrical energy storage devices 1 may be stacked in the same position in the vertical direction.

Accordingly, the electrical energy storage device 1 may be stacked at the same position without being twisted by the first protrusion 91 and the second protrusion 92 of the heat dissipating member 90 . In addition, the height between the electric energy storage devices 1 can be maintained and height deviation can be reduced.

In addition, the heat dissipation member 80 may be made of a material commonly used in the technical field of the present invention, and a metal material having high conductivity and heat dissipation is preferable. In addition, the heat dissipation member 90 is formed of an elastic material, and when a plurality of electrical energy storage devices 1 are laminated and pressurized, contact resistance between the electrical energy storage devices 1 may be increased to decrease contact resistance. However, it is not limited thereto.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can implement it in other specific forms without changing the technical spirit or essential features of the present invention. you will be able to understand In addition, elements of the embodiments of the present invention may be combined, combined, or substituted with each other. Therefore, the embodiments described above are illustrative in all respects and are not restrictive.

1: Electrical energy storage device
10: sheet
20: positive terminal
30: negative terminal
40: internal electrode lead
50: pouch film
60: external electrode lead
70 : rivet
71: head
710: nut groove
7100: screw groove
72: body
80: Bolt
81: bolt head
810: head turn
82: bolt shaft
820: thread
821: first bolt shaft
8210: axon
822: second bolt shaft
90: heat dissipation member
91: first protrusion
92: second protrusion

Claims (7)

A sheet composed of an anode, a cathode and a separator;
a positive electrode terminal connected to the positive electrode of the sheet and formed on one side;
a negative electrode terminal connected to the negative electrode of the sheet and formed on the other side;
Internal electrode leads connected to the positive terminal and the negative terminal, respectively, and located on the upper and lower surfaces of the sheet;
a pouch film installed in contact with the internal electrode leads and coupled to each other to form an electrical energy storage device;
external electrode leads bonded to both upper and lower surfaces of the electrical energy storage device to transmit electricity generated in the sheet to the outside;
A rivet coupled through a hole provided in the inner electrode lead, the pouch film, and the outer electrode lead, and
An electrical energy storage device having electrode leads coupled by rivet bolts including bolts installed on the rivets to fix adjacent electrical energy storage devices.
According to claim 1,
The rivet,
It is formed to be spaced apart at a certain interval on one side, and is formed to cross the rivet formed on the other side, and includes a head and a body so that they can be closely coupled to the external electrode lead,
the head,
An electric energy storage device having an electrode lead coupled with a rivet bolt formed inside the center and having a nut groove formed along the inner circumferential surface to be coupled with the bolt.
According to claim 1,
the bolt,
It includes a bolt shaft with threads formed on the bolt head and the outer circumferential surface,
The bolt shaft,
A first bolt shaft formed to have a length in the vertical direction at the lower end of the bolt head, and
And a second bolt shaft formed to extend downward from the first bolt shaft and screwed into the nut groove,
The bolt head,
An electrical energy storage device having electrode leads coupled by rivet bolts, characterized in that inserted between the pair of first bolt shafts when adjacent electrical energy storage devices are stacked.
According to claim 3,
The first bolt shaft,
Electrical energy storage device having an electrode lead coupled with a rivet bolt, characterized in that formed larger than the diameter of the nut groove to widen the contact area with the rivet.
According to claim 3,
The bolt head,
Including a head projection formed along the outer circumferential surface,
The first bolt shaft,
An electrical energy storage device having electrode leads coupled with rivet bolts formed along an outer circumferential surface and including shaft protrusions that can come into contact with the head protrusions when adjacent electrical energy storage devices are stacked.
According to claim 2,
the head,
Electrical energy storage device having electrode leads coupled with rivet bolts, characterized in that buried in the hole of the external electrode lead to reduce the distance between the electrical energy storage devices.
According to claim 1,
Further comprising heat dissipation members formed on both upper and lower surfaces of the electrical energy storage device to dissipate heat generated inside the electrical energy storage device;
The heat dissipation member,
Comb-shaped first projections are formed on one of the upper and lower surfaces of the electric energy storage device and are spaced apart at a predetermined interval along one side, and second projections formed along the other side to correspond to the first projections are formed on the other side. An electrical energy storage device having an electrode lead coupled with a rivet bolt, characterized in that.

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