KR102636019B1 - Electric energy storage device comprising electrode lead in rivet bolt - Google Patents

Abstract

The present invention relates to an electric energy storage device having electrode leads joined by rivet bolts, and more specifically, a sheet composed of an anode, a cathode, and a separator; A positive 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 terminals, respectively, and located on the upper and lower surfaces of the sheet; A pouch film installed in contact with the internal electrode lead and coupled to each other to form an electrical energy storage device; External electrode leads bonded to both the upper and lower sides of the electric energy storage device and transmitting electricity generated in the sheet to the outside; An electric device having an electrode lead coupled with a rivet bolt, including a rivet coupled through a hole provided in the internal electrode lead, the pouch film, and the external electrode lead, and a bolt installed on the rivet to secure an adjacent electric energy storage device. It is about energy storage devices.

Description

Electric energy storage device comprising electrode lead in rivet bolt}

The present invention relates to an electric energy storage device having an electrode lead joined with a rivet bolt. More specifically, an internal electrode lead, an external electrode lead, and a pouch film are joined with a rivet, and a bolt is installed on the rivet to generate electrical energy at low pressure. This relates to an electric energy storage device that can stack storage devices, and has electrode leads joined with rivet bolts that not only lowers contact resistance but also allows stable stacking.

In general, an energy storage device refers to a device that stores electrical energy internally and supplies it to the outside when necessary. Representative examples of energy storage devices that use electrochemical reactions include batteries and capacitors.

Here, in the case of a lithium-ion battery, the battery generates electricity through the oxidation-reduction reaction of lithium ions and can slowly charge and discharge power over a long period of time, while the capacitor has high power density but low energy density, so it cannot output high power at once. However, the charging and discharging time is very fast.

Meanwhile, a supercapacitor is located at the midpoint between a conventional capacitor and a battery, and can store a larger amount of energy than a conventional capacitor while producing much higher output than a battery. A supercapacitor is an energy storage device that stores a lot of energy by using simple ion movement to the interface between electrodes and electrolyte 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 devices described above are mainly in the form of cylindrical, coin, and pouch types. Here, the pouch-type electric energy storage device is sealed with an electrode assembly capable of charging and discharging inside the exterior material, and an electrode lead electrically connected to the electrode assembly protrudes from the exterior material to transmit current.

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

As a 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 provided with a storage portion capable of accommodating the electrode assembly. A pouch-type secondary battery is proposed, including a lead protruding direction of the positive electrode and a lead protruding direction of the negative electrode forming a right angle to each other. .

This technology cannot proceed with the pressurization process at low pressure, the contact force of the electric energy storage device is low, and there are problems with the electric energy storage device being disturbed when stacked.

Therefore, the present invention was proposed to improve such conventional problems. In more detail, the internal electrode lead, external electrode lead, and pouch film are joined with rivets, and bolts are installed on the rivets to create an electric energy storage device at low pressure. The purpose is to provide an electric energy storage device that can be stacked and has electrode leads joined with rivet bolts that not only lower contact resistance but also allow stable stacking.

In order to solve the above problem, an electric energy storage device having electrode leads coupled with rivet bolts according to the first embodiment of the present invention includes a sheet composed of an anode, a cathode, and a separator; A positive 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 terminals, respectively, and located on the upper and lower surfaces of the sheet; A pouch film installed in contact with the internal electrode lead and coupled to each other to form an electric energy storage device; External electrode leads bonded to both the upper and lower sides of the electric energy storage device and transmitting electricity generated in the sheet to the outside; It may include a rivet coupled through a hole provided in the internal electrode lead, pouch film, and external electrode lead, and a bolt installed on the rivet to secure an adjacent electric energy storage device.

In addition, the rivet is formed on one side to be spaced at a certain distance and on the other side is formed to be staggered with the rivet formed on one side, and includes a head and a body so as to be in close contact with the external electrode lead, and the head is located inside the center. It is formed with a screw groove along the inner peripheral surface and may include a nut groove to be coupled to the bolt.

In addition, the bolt includes a bolt head and a bolt shaft with threads formed on the outer peripheral surface, and the bolt shaft includes a first bolt shaft formed to have a length in a vertical direction at the bottom of the bolt head and extending downward from the first bolt shaft. It includes a second bolt shaft that is formed and screwed into the nut groove, and the bolt head is inserted between the pair of first bolt shafts when adjacent electric energy storage devices are stacked.

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

In addition, the bolt head may include a head protrusion formed along the outer peripheral surface, and the first bolt shaft may include a shaft protrusion that may contact the head protrusion when adjacent electric energy storage devices are stacked. there is.

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

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

The electrical energy storage device having electrode leads coupled with rivet bolts according to an embodiment of the present invention can be stacked at low pressure by combining the internal electrode lead, external electrode lead, and pouch film with rivets.

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

Additionally, as the pressure of the pressurizing process is increased, the contact resistance can be lowered.

Additionally, heat generated inside the electric energy storage device can 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 electric energy storage devices.

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

Figures 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.
Figures 2 (a) and (b) are bolt-separated cross-sectional views and cross-sectional views taken along line A-A' in Figure 1.
Figure 3 is a side view showing the electrical energy storage device of Figure 1 stacked.
Figures 4 (a) and (b) are exemplary diagrams showing different types of bolts in Figure 1 formed.
Figures 5 (a) and (b) are exemplary views showing the first bolt shaft of Figure 1 having a larger diameter than the nut groove.
Figures 6 (a) and (b) are exemplary views showing protrusions formed on the bolt of Figure 1.
Figure 7 is a side view showing the electrical energy storage device of Figure 6 stacked.
Figures 8 (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 second embodiment of the present invention.
Figures 9 (a) to (c) are exemplary diagrams showing the rivets of Figure 8 being coupled.
Figures 10 (a) and (b) are bolt-separated cross-sectional views and cross-sectional views taken along line B-B' of Figure 8.
Figure 11 is a side view showing the electrical energy storage device of Figure 8 stacked.
Figures 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.
Figures 13 (a) to (c) are exemplary views showing the electric energy storage device of Figure 11 being combined.

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

In the following description, the terms first, second, etc. are terms used to describe various components, and their meaning is not limited, and is used only for the purpose of distinguishing one component from other components.

Like reference numerals used throughout this specification refer to like elements.

As used herein, singular expressions include plural expressions, unless the context clearly dictates otherwise. In addition, terms such as “comprise,” “provide,” or “have” used below are intended to designate the presence of features, numbers, steps, operations, components, parts, or a combination thereof described in the specification. It should be construed and understood as not excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Before explaining the present invention, the electric energy storage device described in the present invention may be configured in various shapes, including but not limited to a square shape, a pouch shape, and a cylindrical shape.

In addition, the electrical energy storage device may use a variety of electrical energy storage cells capable of storing electrical energy, such as super capacitor cells, lithium-ion battery cells, and lithium-ion capacitor cells. However, in the present invention, a pouch-type battery cell is used. The explanation will focus on .

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

Figures 1 (a) and (b) are a perspective view and a bottom perspective view of an electric energy storage device having an electrode lead coupled with a rivet bolt according to an embodiment of the present invention, and Figures 2 (a) and (b) are diagrams. It is a bolt-separated cross-sectional view and a cross-sectional view taken along line A-A' of Figure 1, Figure 3 is a side view showing the stacked electric energy storage device of Figure 1, and Figures 4 (a) and (b) are of Figure 1. It is an example diagram showing how a different type of bolt is formed, and Figures 5 (a) and (b) are an example diagram showing the first bolt axis of Figure 1 having a diameter larger than the nut groove, and Figure 6 (a) and (b) are exemplary views showing protrusions formed on the bolt of FIG. 1, and FIG. 7 is a side view showing the electrical energy storage device of FIG. 6 stacked.

Referring to Figures 1 to 7, the electric energy storage device 1 having an electrode lead coupled with a rivet bolt of the present invention largely consists of a sheet 10, a positive electrode terminal 20, a negative electrode terminal 30, and an internal electrode lead. It may include (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 technical field to which the present invention pertains. The shape of the sheet 10 may be a stack type, jelly roll type, stack and folding type, or Z-folding type. It is not limited to this.

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

The separator is not particularly limited as long as it is commonly used in the technical field to which the present invention pertains. 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-type polymer electrolyte can be used.

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

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

Specifically, when the internal electrode lead 40 connected to the positive electrode 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. Additionally, the internal electrode lead 40 may be joined to the anode terminal 20 or the cathode terminal 30 by welding such as ultrasonic welding, but is not limited to this.

The pouch film 50 is installed in contact with the internal electrode lead 40 and can be combined with each other to form the electric 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 pertains. The pouch film 50 may be composed of a laminated multi-layer structure, including a resin inner layer that acts as a heat sealing layer, a base material that maintains mechanical strength, a metal foil layer that acts as a moisture and oxygen barrier layer, and a base and protective layer. The outer layer, which acts as a layer, can be sequentially laminated.

The external electrode lead 60 is bonded to both the upper and lower sides of the electric 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 it may be another electrical energy storage device (1).

In addition, the external electrode lead 60 is formed to be exposed to the outside in order to be electrically connected to the internal sheet 10, and an insulating film to protect the external electrode lead 60 may be attached to the upper and lower surfaces.

Lastly, the rivet 70 can penetrate and couple the internal electrode lead 40, the pouch film 50, and the external electrode lead 60, and may include a head 71 and a body 72 for this purpose. there is.

In general, a rivet is a rod-shaped connecting material used to permanently join metal materials. It is fastened by stacking metal materials with holes, aligning the holes, inserting a rivet, supporting the head, and pounding it with a machine.

Through the combination of these rivets 70, the electric energy storage device 1 can combine the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 at low pressure, and further increase the pressure. The contact resistance between the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 can be lowered.

In addition, the rivets 70 may be formed on both the upper and lower sides of the electric energy storage device 1, and may be formed at regular intervals on one side and may be formed on the other side to be staggered with the rivets 70 formed on one side.

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

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

However, the bolt 80 is not limited to this and can be screwed within the depth range of the nut groove 710 according to the user's request.

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

The material of the rivet 70 can be used to 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 to this and can be used in a variety of ways as a heat-resistant material that can withstand heat generated and transmitted internally and as a conductive material that can transmit electric current.

In addition, the internal electrode lead 40, pouch film 50, and external electrode lead 60 fastened by the rivet 70 may be provided with a hole so that the rivet 70 can penetrate through the hole. However, it is not limited to this.

For example, if the internal electrode lead 40, the pouch film 50, and the external electrode lead 60 are combined with holes provided only in the internal electrode lead 40 and the pouch film 50, the external electrode lead ( 60) may be rolled in during the joining process of the rivet (70). Accordingly, current transfer efficiency may increase.

In addition, the holes of the internal electrode lead 40, pouch film 50, and external electrode lead 60 increase the diameter of the body 72 when the rivet 70 is combined, so that the hole of the body 72 of the rivet 70 It is preferable that it is formed slightly larger than the diameter.

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

The bolt head 81 is formed in a cylindrical shape with a low height, and may be formed to have a diameter larger 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. The bolt shaft 82 may have a thread 820 formed on its outer peripheral surface 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 peripheral surface of the bolt shaft 82, but is not limited to this and may be formed on a portion of the outer peripheral surface. This will be explained in detail below with reference to FIGS. 4 and 5.

Additionally, 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 a vertical direction at the bottom of the bolt head 81, and the second bolt shaft 822 may be 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 to the nut groove 710 of the rivet 70, and the first bolt The shaft 82 is not inserted into the nut groove 710 so that a separation distance is formed between the head 71 of the rivet 70 and the bolt head 81.

Additionally, the adjacent electric energy storage device 1 can be stably stacked by combining the first bolt shaft 821 and the bolt head 81.

For example, rivets 70 are formed on the upper surface of the electric energy storage device 1 to be spaced at regular intervals, and rivets 70 are formed on the lower surface to be alternate 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 electric 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 combined in close contact with each other in a sliding manner.

Accordingly, as shown in FIG. 3, the bolts 80 may be formed to be staggered on the upper and lower surfaces of the electric 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 positioned vertically in a straight line and fixed in the 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 to this.

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

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

The bolt 80 can be made of materials such as the internal electrode lead 40, external electrode lead 60, and rivet 70 to allow current to flow normally. However, it is not limited to this and can be used in a variety of ways as a heat-resistant material that can withstand heat generated and transmitted internally and as a conductive material that can transmit electric current.

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

Specifically, when the screw thread 820 is formed throughout the bolt shaft 82, the second bolt shaft 822 is screwed to the nut groove 710 and is connected to the first bolt shaft 821 by the screw thread 820. The bolt (80) may shake. In addition, when the electric energy storage device 1, in which a part of the first bolt shaft 821 is inserted into the nut groove 710 and screwed together, is stacked, the bolt head 81 is between the pair of first bolt shafts 821. Since it is not inserted, stacking of the electric energy storage device 1 may be difficult.

On the other hand, the bolt shaft 82 has a thread 820 formed only on the second bolt shaft 822, which not only increases the coupling force between the rivet 70 and the bolt 80, but also maintains the height of the first bolt shaft 821. It is possible to ensure that the stacking of the electrical energy storage device () is performed stably.

In addition, the first bolt shaft 821 is formed to be larger than the diameter of the nut groove 710 to expand 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 The diameter may be smaller than that of the head portion 71. In addition, as shown in (b) of FIG. 5, after the second bolt shaft 822 is inserted into the nut groove 710 and screwed together, the outer surface of the head 71 of the rivet 70 is 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 can be expanded, thereby increasing the fixing force.

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 electric energy storage devices are stacked. The first bolt shaft 821 may include an shaft protrusion 8210.

The head protrusion 810 may be formed along the outer peripheral surface of the bolt head 81, and the axial protrusion 8210 may be formed along the outer peripheral surface of the first bolt shaft 821, but the head protrusion 810 and the axial protrusion 8210 may be formed along the outer peripheral surface of the bolt head 81. ) can be inserted by being positioned alternately.

Additionally, 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 to this. Additionally, the second bolt shaft 822 may be screwed to the nut groove 710, as shown in (b) of FIG. 6.

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 positioned alternately to appear combined. You can check it. As a result, the contact force between the bolt shaft 82 and the bolt head 81 can be increased, and the fixing force between the electric energy storage devices 1 is improved, as well as the contact area is expanded, allowing more current to be transmitted to the adjacent electric energy storage device 1. It can be delivered efficiently.

Figures 8 (a) and (b) are a perspective view and a bottom perspective view of an electric energy storage device having an electrode lead coupled with a rivet bolt according to a second embodiment of the present invention, and Figures 9 (a) to (c) is an example diagram showing the rivet of FIG. 8 being coupled, (a) and (b) of FIG. 10 are a bolt separation cross-sectional view and a cross-sectional view taken along line B-B' of FIG. 8, and FIG. 11 is a cross-sectional view of the rivet of FIG. 8. This is a side view showing how electrical energy storage devices are stacked.

8 to 11, the head portion 71 of the electric energy storage device 1 having an electrode lead coupled with a rivet bolt 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 an electrode lead coupled with a rivet bolt according to the second embodiment of the present invention is a rivet according to the first embodiment of the present invention described above. It can be said to be substantially the same as the electric energy storage device 1 having electrode leads coupled with bolts.

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

The head portion 71 may be buried inside through a hole in 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 Figure 9 (a), the hole of the external electrode lead 60 is formed in a shape where the diameter narrows toward the pouch film 50, and the head portion 71 narrows downward. 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 that order.

Afterwards, 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 formed to form the internal electrode lead 40, the pouch film 50, and the The external electrode lead 60 can be combined. Additionally, the surface of the head 71 can be formed to be flat so that after it is embedded in the external electrode lead 60, it can be flush with the external electrode lead 60.

After the bolt 80 is screwed to the head 71 of the rivet 70, as shown in (b) of Figure 10, the head 71 is embedded in the external electrode lead 60 to form an external electrode. The step between the lead 60 and the bolt 80 may be reduced. Accordingly, the thickness of the electrical energy storage device 1 is reduced, thereby reducing the total stacked volume when multiple electrical energy storage devices 1 are stacked.

Figures 12 (a) and (b) are a perspective view and a bottom perspective view of an electric energy storage device having an electrode lead coupled with a rivet bolt according to a third embodiment of the present invention, and Figures 13 (a) to (c) is an example diagram showing how the electric energy storage device of FIG. 11 is combined.

Referring to Figures 12 and 13, the electric energy storage device 1 having electrode leads coupled with rivet bolts according to the third embodiment of the present invention includes a heat dissipation member 80 that allows heat generated internally to be released. More may be included.

Here, except for the heat dissipation member 80, the electric energy storage device 1 having an electrode lead coupled with a rivet bolt according to the third embodiment of the present invention is a rivet according to the first embodiment of the present invention described above. It can be said to be substantially the same as the electric 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 radiates heat generated inside the electric energy storage device 1, and is formed on both the upper and lower sides of the electric energy storage device 1, with a first protrusion 91 formed on one of them, A second protrusion 92 may be formed on the other one.

The first protrusions 91 are formed at regular intervals along one side of the electric 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 electric energy storage device 1. It may be formed to correspond to the protrusion 91.

For example, a heat dissipation member 90 with a first protrusion 91 is formed on the upper surface of the electric energy storage device 1, and a heat dissipation member 90 with a second protrusion 92 is formed on the lower surface. You can. When a plurality of electric energy storage devices 1 are stacked, the second protrusion 92 of the heat dissipation member 90 of the electric energy storage device 1 located on the upper side as shown in (b) of FIG. 13 and the first protrusion 91 of the upper surface heat dissipation member 90 of the electric energy storage device 1 located below may be coupled in close contact with each other 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 can move while being in close contact with the groove between the first protrusions 91. Thereafter, the ends of the first protrusion 91 and the second protrusion may meet and be fixed to the inner surface of the heat dissipation member 90 to be coupled. A pair of electric energy storage devices 1 may be stacked at the same position in the vertical direction, as shown in (c) of FIG. 13.

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

Additionally, 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 with high conductivity and heat dissipation is preferred. In addition, the heat dissipation member 90 is made of an elastic material, so that when a plurality of electric energy storage devices 1 are stacked and pressed, contact resistance can be lowered by increasing the contact force between the electric energy storage devices 1. However, it is not limited to this.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art can realize that the present invention can be implemented in other specific forms without changing the technical idea or essential features of the present invention. You will be able to understand it. Additionally, the components of the embodiments of the present invention may be combined, combined, or substituted for 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 projection
82: bolt axis
820: thread
821: 1st bolt axis
8210: Axial process
822: 2nd bolt axis
90: Heat dissipation member
91: first protrusion
92: second protrusion

Claims (7)

A sheet consisting of an anode, a cathode, and a separator;
A positive 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 terminals, respectively, and located on the upper and lower surfaces of the sheet;
A pouch film installed in contact with the internal electrode lead and coupled to each other to form an electric energy storage device;
External electrode leads bonded to both the upper and lower sides of the electric energy storage device and transmitting electricity generated in the sheet to the outside;
A rivet coupled through a hole provided in the internal electrode lead, pouch film, and external electrode lead, and
Includes a bolt installed on the rivet to secure an adjacent electric energy storage device,
The bolt is,
It includes a bolt head and a bolt shaft with threads formed on the outer peripheral surface,
The bolt axis is,
A first bolt shaft formed to have a length in a vertical direction at the bottom of the bolt head, and
It includes a second bolt shaft formed to extend downward from the first bolt shaft and screwed into the nut groove,
The bolt head is,
An electric energy storage device having an electrode lead coupled with a rivet bolt, characterized in that it is inserted between the horizontally adjacent first bolt axes when adjacent electric energy storage devices are stacked.
According to paragraph 1,
The rivet is,
It is formed on one side to be spaced at a certain distance, and on the other side, it is formed to be staggered with rivets formed on one side, and includes a head and a body so as to be in close contact with the external electrode lead,
The header,
An electric energy storage device having an electrode lead formed inside the center and coupled with a rivet bolt including a nut groove provided with a screw groove along the inner peripheral surface to be coupled to the bolt.
delete According to paragraph 2,
The first bolt shaft is,
An electric energy storage device having an electrode lead coupled with a rivet bolt, characterized in that it is formed larger than the diameter of the nut groove to expand the contact area with the rivet.
According to paragraph 1,
The bolt head is,
It includes a head projection formed along the outer peripheral surface,
The first bolt shaft is,
An electric energy storage device having an electrode lead formed along the outer circumferential surface and coupled with a rivet bolt and including an axial protrusion that can come into contact with the head protrusion when adjacent electric energy storage devices are stacked.
According to paragraph 2,
The header,
An electric energy storage device having an electrode lead coupled with a rivet bolt, characterized in that it is buried inside the hole of the external electrode lead to reduce the gap between the electric energy storage devices.
According to paragraph 1,
It further includes a heat dissipation member formed on both the upper and lower sides of the electrical energy storage device to dissipate heat generated inside the electrical energy storage device,
The heat dissipation member is,
A comb-shaped first protrusion formed at a predetermined interval along one side is formed on one of the upper and lower surfaces of the electric energy storage device, and a second protrusion formed along the other side to correspond to the first protrusion is formed on the other side. An electric energy storage device having electrode leads joined by rivet bolts.