KR101107917B1 - case for capacitor - Google Patents

Abstract

The present invention provides a container for energy storage devices that can ensure reliability and stability of medium and large energy storage devices even when an impact is applied. The presented energy storage device container includes a bending portion formed along an upper outer circumference of the energy storage device container and a bent portion formed in at least one longitudinal direction of the container. By forming one or more straight curved portions in the longitudinal direction of the container in addition to the bent portion of the upper part of the container, the shaker of the electrode winding body inside the container is further prevented and the movement of the electrolyte is not excessively compared to the conventional one. . In addition, a partial buffer effect can be expected when the internal pressure increases.

Description

Container for energy storage element

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for energy storage elements, and more particularly to a container employable in energy storage elements such as a wound capacitor.

The highly information society is leading a high value-added industry that collects and utilizes various and useful information in real time through various information and communication devices.

Such information / communication devices and various electronic products are equipped with an electric circuit board. Each circuit board is equipped with a part called a capacitor, which collects and discharges electricity to stabilize electric flow in the circuit.

Capacitors that perform these essential functions have recently been used for memory backup of home appliances and information / communication devices as they have become larger, and as technology advances, they are emerging as new energy sources that can be used or replaced with existing lithium-ion batteries. It is becoming.

Basically, the capacitor has a structure in which two electrode plates are opposed to each other. When a direct current voltage is applied to the two electrode plates, electricity called " charge " is accumulated on each electrode, and a current flows during the accumulation, but no current flows in the accumulated state. When DC voltage is applied to the capacitor, the current flows instantaneously but not afterwards, so the DC current is cut off, but in the case of AC, the current flows each time as the + and-continue to change. will be.

Capacitors are made by placing insulators between the electrodes of two pole plates, which are classified into aluminum, tantalum, ceramics, laminated ceramics, films, and supercapacitors.

Looking at the configuration of a general winding type energy storage device as shown in FIG. 1 shows a configuration of a winding type energy storage device of a general lead type. The anode electrode 14 of the thin film of aluminum and the cathode electrode 16 of the thin film of aluminum are wound by being separated by a separator 12 interposed between the two electrodes and wound together with the lead terminals 17 and 18. . Here, the lead terminal 17 may be a lead terminal for a negative electrode, and the lead terminal 18 may be a lead terminal for a positive electrode. In the drawing, the anode electrode 14 and the cathode electrode 16 are simply illustrated, but in practice, an electrode active material is applied to one surface of each collecting electrode to form the anode electrode 14 or the cathode electrode 16. The aggregate (that is, the aggregate of the dried shape) of the positive electrode 14 and the negative electrode 16 wound together with the lead terminals 17 and 18 is referred to as the electrode wound body 5. Reference numeral 10 denotes a container made of a material such as aluminum, and reference numeral 20 denotes a sealing cap such as rubber packing.

Typically, the electrode winding 5 is joined to the electrolyte and inserted into the container 10. The sealing cap 20 is coupled to the upper opening side of the container 10, and the outer contact surface of the container 10 and the sealing cap 20 is pressed to form a concave rounded bending portion 22 (also referred to as a vent portion). The upper end of the container 10 is brought into close contact with the upper surface of the sealing cap 20 through curling.

At present, there is a need for a large-capacity energy storage device, and accordingly, the size of the container also increases, thereby increasing the internal pressure in the container (ie, increasing the amount of internal gas generated).

In the case of a low dose (for example, less than 100F), the internal pressure is low, and even if the internal pressure increases even when the sealing cap 20 of the rubber material is used, a safety vent (not shown) of the lower part of the container is blown first.

However, in the case of high capacity (e.g., 100F or more), when the sealing cap 20 is made of rubber, the elastic upper sealing cap 20 will swell before the safety vent (not shown) of the lower part of the container bursts to disassemble the cell. do. Accordingly, the high capacity energy storage element uses a phenol resin rubber laminate (terminal plate) to safely lower the safety vent first when the internal pressure rises.

As a result, as the size of the device increases in assembling the energy storage device, the sealing method is different. In other words, the small product is inserted into a relatively narrow rubber sealing cap 20 in the thick portion of the lead terminal portion, there is no shaking and the size is slightly smaller than the container 10, so that the vent and curling operation can be performed at the same time.

However, the medium-large product is difficult to fix between the winding element and the terminal plate because the tab terminal connected to the electrode winding 5 is fixed to the terminal plate by punching and riveting. As a result, the venting and curling operations cannot be performed simultaneously. Accordingly, the venting operation is performed before the terminal plate is fixed, and then the curling operation is performed.

As such, it is difficult to simultaneously vent and curl the terminal coupling method for the medium and large products and the characteristics of the terminal plate.

In addition, when the bending part 22 is formed at the upper end portion of the container of the medium-large product, not only dead space is generated inside the container but also the electrode winding 5 inside the container is shaken.

If the electrode winding 5 inside the container is shaken by an impact or the like, deterioration of the internal element (electrode winding) is accelerated to cause a short circuit in the electrode winding or shorten the service life.

The present invention has been proposed to solve the above-described problems, and an object thereof is to provide a container for an energy storage device capable of ensuring the reliability and stability of a medium-large energy storage device even when an impact is applied.

In order to achieve the above object, a container for an energy storage device according to a preferred embodiment of the present invention, an energy storage device container, a bending portion formed along the upper outer circumference of the container; And at least one curved portion formed in the longitudinal direction of the container.

The bent portion is formed concave, and the bent portion is formed in a straight shape.

One side of the bent portion is connected to the bending portion and the other side abuts the bottom of the container.

According to another preferred embodiment of the present invention, a container for an energy storage device includes: a container for an energy storage device, comprising: a bending portion formed along an upper outer circumference of the container; And at least one first bent part formed along the outer circumference of the container to be spaced apart from the bending part. And a second bent portion formed in at least one longitudinal direction of the container and intersecting the first bent portion.

The first bend and the second bend are formed concave.

According to another preferred embodiment of the present invention, a container for an energy storage device includes a container for an energy storage device, the bending portion formed along an upper outer circumference of the container; And a curved portion formed in a longitudinal direction of the container and formed in a spiral shape.

The bends are formed concave.

According to another preferred embodiment of the present invention, a container for an energy storage device includes a container for an energy storage device, the bending portion formed along an upper outer circumference of the container; A first bent part formed along an outer circumference of the container and spaced apart from the bent part and formed below the bent part; And a second curved portion formed along an outer circumference of the container and spaced apart from the bending portion and the first curved portion and formed below the first curved portion.

The first bent portion is formed in a ring shape to be close to the bending portion, and the second bent portion is formed in a ring shape to be close to the bottom of the container.

The first bent portion and the second bent portion are formed in a ring shape to be spaced apart from each other at the central portion in the longitudinal direction of the container.

According to the present invention having such a configuration, by forming one or more straight curved portions in the longitudinal direction of the container in addition to the bending portion of the upper portion of the container, as compared with the conventional one to further prevent shaking of the electrode winding body in the container, The movement will not give a star cluster. In addition, a partial buffer effect can be expected when the internal pressure increases.

By forming one or more first bends along the outer circumference of the container to be spaced apart from the bend of the upper part of the container and forming a second bend in the longitudinal direction of the container to intersect the first bend, thereby the electrode windings inside the container It is possible to further prevent shaking. In addition, a partial buffer effect can be expected when the internal pressure increases.

By forming a spiral bent portion in the longitudinal direction of the container in addition to the bending portion of the upper portion of the container, as compared with the conventional one, the shaking of the electrode winding body inside the container is further prevented and the movement of the electrolyte is not excessively affected. In addition, a partial buffer effect can be expected when the internal pressure increases.

By forming the first bend in the lower portion of the bending portion spaced apart from the bending portion of the upper portion of the container and forming the second bend in the lower portion of the first bent portion spaced apart from the bending portion and the first bend portion, It is possible to further prevent shaking of the electrode winding body. In addition, a partial buffer effect can be expected when the internal pressure increases.

Hereinafter, a container for an energy storage device according to an embodiment of the present invention will be described with reference to the accompanying drawings. Prior to the detailed description of the present invention, the terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In the following description of the embodiments, the same reference numerals are given to the same components as the conventional components, and description thereof will be omitted.

(First embodiment)

2 is a view for explaining an energy storage device employing a container for an energy storage device according to a first embodiment of the present invention. 3 is a bottom view of FIG. 2.

It is preferable that the container 30 for energy storage elements of the first embodiment is mainly employed in medium and large products. It is assumed that the energy storage element employing the container 30 for energy storage elements of the first embodiment is a wound type energy storage element of the lead type already described with reference to FIG. By this assumption, it can be understood that the electrode winding body built in the container 30 for energy storage elements has the same structure as the electrode winding body 5 of FIG.

Comparing the container 30 for the energy storage device of the first embodiment with the container for the wound energy storage device of FIG. 1, the difference is that the bend 32 is further provided in addition to the ring-shaped bending part 22. Flies

In the first embodiment, the bent portion 32 is formed at least one predetermined length in the longitudinal direction of the container (30). One side (upper side) of the bent part 32 is connected to the bending part 22, and the other side (lower side) abuts on the bottom surface of the container 30. Preferably, the bent portion 32 is formed concavely in a straight shape.

In the first embodiment, one side of the bent part 32 is connected to the bending part 22 and the other side is formed to abut the bottom surface of the container 30, but if necessary, one side of the bent part 32 is the bending part 22. The other side of the curved portion 32 may not be brought into contact with the bottom surface of the container 30. On the other hand, one side of the bent portion 32 may not be connected to the bending portion 22 and the other side may not be brought into contact with the bottom surface of the container 30.

As described above, when the curved portion 32 is additionally formed in addition to the bending portion 22, the shaking of the electrode winding 5 inside the container 30 is prevented as compared with a conventional container having only the bending portion 22. Accordingly, shaking of the electrode winding body 5 inside the container 30 due to the impact is prevented, thereby helping to secure reliability. In addition, a partial buffer effect can be expected when the internal pressure increases.

When the bent part 32 is formed along the outer circumference of the container 30 in a ring shape like the bending part 22 (that is, the bent part 32 is formed in the horizontal direction rather than the longitudinal direction (vertical direction) in FIG. 2). Since it may adversely affect the movement of the electrolyte solution, in the first embodiment, the bent portion 32 is formed in the longitudinal direction of the container 30 so as not to give excessive force to the movement of the electrolyte solution.

As described above, the operation of forming the bent portion 32 in the longitudinal direction of the container 30 can be sufficiently performed by the existing drawing operation, so that the production of the container 30 is easy.

(Second embodiment)

4 is a view for explaining an energy storage device employing a container for an energy storage device according to a second embodiment of the present invention.

It is preferable that the container 40 for energy storage elements of the second embodiment is mainly employed in medium and large products. It is assumed that the energy storage element employing the container 40 for energy storage elements of the second embodiment is a wound type energy storage element of the lead type already described with reference to FIG. By this assumption, it can be understood that the electrode winding body built in the container 40 for energy storage elements has the same configuration as the electrode winding body 5 of FIG.

It can be said that the second embodiment differs in the shape of the bent portion compared with the first embodiment described above. In the first embodiment, the bent portion was formed in a straight shape, but in the second embodiment, it was formed in a cross shape.

The bend portion 42 of the second embodiment is formed at least one first bend portion 42a along the outer circumference of the container 40 to be spaced apart from the bending portion 22, and at least one predetermined length in the longitudinal direction of the container 40. The second bent part 42b is formed, and one side (upper side) is connected to the bending part 22 and the other side (lower side) contacts the bottom of the container 40 and intersects with the first bent part 42a.

Here, since the first bent portion 42a is formed in a ring shape along the outer circumference of the container 40, it may be referred to as a ring bent portion, and the second bent portion 42b is formed in a straight shape in the longitudinal direction of the container 40. It may be called a date bend. In addition, although only one 1st bending part 42a was shown in FIG. 4, two or more may be needed as needed. In Fig. 4, the second bend portion 42b is considered to be formed at the position where the bend portion 32 (see Fig. 3) of the first embodiment is formed.

In the second embodiment, one side of the second bent portion 42b is connected to the bending portion 22 and the other side is formed to be in contact with the bottom surface of the container 40, but if necessary, one side of the second bent portion 42b is bent. It may not be connected to the part 22, or the other side of the 2nd bend part 42b may not be in contact with the bottom face of the container 40. On the other hand, one side of the second bent portion 42b may not be connected to the bending portion 22, and the other side may not be in contact with the bottom surface of the container 40.

As such, when the first bends 42a and the second bends 42b are additionally formed in addition to the bends 22, the electrode winding body inside the container 40 is compared with the existing container having only the bends 22. It will prevent the shaking of 5). Accordingly, shaking of the electrode winding 5 inside the container 40 due to the impact is prevented, thereby helping to secure reliability. In addition, a partial buffer effect can be expected when the internal pressure increases.

Of course, as compared with the first embodiment, since the first curved portion 42a is formed along the outer circumference of the container 40 in a ring shape like the bending portion 22, it may be an element preventing the movement of the electrolyte. . However, from the standpoint of securing reliability, it is possible to prevent shaking of the electrode winding 5 inside the container 30 due to the impact, which is superior to the existing container.

(Third Embodiment)

5 is a view for explaining an energy storage device employing a container for an energy storage device according to a third embodiment of the present invention.

It is preferable that the container 50 for energy storage elements of the third embodiment is mainly employed in medium and large products. It is assumed that the energy storage element employing the container 50 for energy storage elements of the third embodiment is a wound type energy storage element of the lead type already described with reference to FIG. Based on these assumptions, it can be understood that the electrode winding body built into the container 50 for energy storage elements has the same configuration as the electrode winding body 5 of FIG. 1.

The third embodiment can be said to be different in the shape of the bent portion compared with the first and second embodiments described above. In the first embodiment, the bent portion was formed in a straight shape. In the second embodiment, the bent portion was formed in a cross shape. In the third embodiment, the bent portion 52 was formed in a spiral shape.

The energy storage device container 50 of the third embodiment may be somewhat more difficult to manufacture than the first and second embodiments.

However, by forming the bent portion 52 in a helical shape, it is possible to prevent shaking of the electrode winding 5 inside the container 50 as compared to the existing container having only the bending part 22. Accordingly, shaking of the electrode winding body 5 inside the container 50 due to the impact is prevented, thereby helping to secure reliability. In addition, a partial buffer effect can be expected when the internal pressure increases.

If the bent portion 52 is formed along the outer circumference of the container 50 in a ring shape like the bending portion 22, it may adversely affect the movement of the electrolyte, so in the third embodiment, not much star is imposed on the movement of the electrolyte. In order to prevent the bent portion 52 was formed in a spiral shape.

(Example 4)

6 is a view for explaining an energy storage device employing a container for an energy storage device according to a fourth embodiment of the present invention.

It is preferable that the container 60 for energy storage elements of the fourth embodiment is mainly employed in medium and large products. It is assumed that the energy storage element employing the container 60 for energy storage elements of the fourth embodiment is a wound type energy storage element of the lead type already described with reference to FIG. By this assumption, it can be understood that the electrode winding body built in the container 60 for energy storage elements has the same configuration as the electrode winding 5 of FIG. 1.

In the first embodiment, the bent portion is formed in a straight shape. In the second embodiment, the bent portion is formed in a cross shape. In the third embodiment, the bent portion 52 is formed in a spiral shape. In the fourth embodiment, the bent portion 22 is formed. ) Is formed in a ring shape, but two or more formed spaced apart from each other is different.

In the fourth embodiment, the first bend 62 and the second bend 64 are included.

The first bent part 62 is formed along the outer circumference of the container 60 but is spaced apart from the bent part 22 and is formed below the bent part 22.

The second bent part 64 is formed along the outer circumference of the container 60, but is spaced apart from the bending part 22 and the first bent part 62 and is formed below the first bent part 62.

Here, the first bent part 62 is formed in a ring shape directly under the bending part 22 so as to be close to the bending part 22. The second bent portion 64 is formed in a ring shape to be close to the bottom of the container 60.

As described above, when the first bent part 62 and the second bent part 64 are additionally formed in addition to the bent part 22, the electrode winding body inside the container 60 may be compared with an existing container having only the bent part 22. It will prevent the shaking of 5). Accordingly, shaking of the electrode winding body 5 inside the container 60 due to the impact is prevented, thereby helping to secure reliability. In addition, a partial buffer effect can be expected when the internal pressure increases.

As compared with the first and third embodiments, the first bend 62 and the second bend 64 are formed along the outer circumference of the container 60 in a ring shape like the bend 22. It may be a factor to hinder the movement of the electrolyte.

However, in view of ensuring reliability, the electrode winding body 5 inside the container 60 due to the impact is prevented from shaking, which is superior to the existing container.

In order to minimize the disturbance of the movement of the electrolyte in the container 60, the first bent part 62 is formed on the upper part of the container 60 to be close to the bending part 22 and the container of the second bent part 64 is formed. Since it is formed at the bottom of 60), there will be less interference with the movement of the electrolyte in the container 60 than in the second embodiment.

(Example 5)

7 is a view for explaining an energy storage device employing a container for an energy storage device according to a fifth embodiment of the present invention.

It is preferable that the container 70 for energy storage elements of the fifth embodiment is mainly employed in medium and large products. It is assumed that the energy storage element employing the container 70 for energy storage elements of the fifth embodiment is a wound type energy storage element already described with reference to FIG. By this assumption, it can be understood that the electrode winding body built in the container 70 for energy storage elements has the same configuration as the electrode winding 5 of FIG.

The energy storage device container 70 of the fifth embodiment differs from the installation position of the bend in comparison with the energy storage device container 60 of the fourth embodiment.

That is, in the fourth embodiment, the first bent part 62 is formed to be close to the bending part 22 and the second bent part 64 is formed to be close to the bottom of the container 60. The difference is that the bent portion 72 and the second bent portion 74 are formed in a ring shape so as to be spaced apart from each other at the central portion in the longitudinal direction of the container 70.

Compared to the fourth embodiment, the fifth embodiment is expected to interfere more with the movement of the electrolyte in the container 70.

However, the fifth embodiment prevents shaking of the electrode winding 5 inside the container 70 as compared with the existing container having only the bending part 22. Accordingly, shaking of the electrode winding 5 inside the container 70 due to the impact is prevented, thereby helping to secure reliability. In addition, a partial buffer effect can be expected when the internal pressure increases.

On the other hand, the present invention is not limited only to the above-described embodiments and can be carried out by modifications and variations within the scope not departing from the gist of the present invention, the technical idea that such modifications and variations are also within the scope of the claims Must see

1 is a view for explaining the configuration of a general wound energy storage device.

2 is a view for explaining an energy storage device employing a container for an energy storage device according to a first embodiment of the present invention.

3 is a bottom view of FIG. 2.

4 is a view for explaining an energy storage device employing a container for an energy storage device according to a second embodiment of the present invention.

5 is a view for explaining an energy storage device employing a container for an energy storage device according to a third embodiment of the present invention.

6 is a view for explaining an energy storage device employing a container for an energy storage device according to a fourth embodiment of the present invention.

7 is a view for explaining an energy storage device employing a container for an energy storage device according to a fifth embodiment of the present invention.

Description of the Related Art

22: bending part 30, 40, 50, 60, 70: container

32, 42, 52: bend

42a, 62, 72: first bend 42b, 64, 74: second bend

Claims (11)

delete delete As a container for an energy storage element, A bending portion formed along an upper outer circumference of the container; And Including at least one bent portion formed in the longitudinal direction of the container, including, The bent portion is a container for an energy storage device, characterized in that one side is connected to the bending portion and the other side abuts on the bottom surface of the container. The method of claim 3, The bent portion is a container for energy storage elements, characterized in that formed in a straight shape. As a container for an energy storage element, A bending portion formed along an upper outer circumference of the container; At least one first bent part formed along an outer circumference of the container to be spaced apart from the bending part; And And at least one second bend formed in the longitudinal direction of the container and intersecting with the first bent part. The method according to claim 5, The first bent portion and the second bent portion is a container for energy storage elements, characterized in that formed concave. delete delete As a container for an energy storage element, A bending portion formed along an upper outer circumference of the container; A first bent part formed along an outer circumference of the container and spaced apart from the bent part and formed below the bent part; And And a second bent portion formed along an outer circumference of the container, spaced apart from the bending portion and the first bent portion, and formed below the first bent portion. The method according to claim 9, And the first bent portion is formed in a ring shape to be close to the bending part, and the second bent portion is formed to be a ring shape to be close to the bottom of the container. The method according to claim 9, The first bent portion and the second bent portion is a container for an energy storage device, characterized in that formed in a ring shape spaced apart from each other in the central portion of the longitudinal direction of the container.

Images