KR101137043B1 - Secondary battery packaging structure - Google Patents

Abstract

The present invention relates to a secondary battery packaging structure that can be repeatedly charged and discharged, and to a secondary battery packaging structure that can increase the energy density per unit volume of the secondary battery by attaching only a minimum of parts to the battery.

The present invention provides a metal battery cell case including an electrolyte solution and an electrode assembly therein and having a positive electrode terminal and a negative electrode terminal at one side thereof; And it provides a secondary battery packaging structure comprising a first insulating cap coupled to one side of the metal battery cell case to surround one or more of the positive electrode terminal and the negative electrode terminal.

Description

 Secondary Battery Packaging Structure {SECONDARY BATTERY PACKAGING STRUCTURE}

The present invention relates to a secondary battery packaging structure capable of repeating charging and discharging, and more particularly, by combining an insulating cap for preventing a short and forming a printed layer directly on the battery case, thereby reducing the energy density per unit volume of the secondary battery. A secondary battery packaging structure that can be increased.

Recently, with the spread of wireless electronic products, various battery pack products have been developed and marketed. Such a battery pack is usually composed of a PCM, a battery body, a Ni-plate and a metal battery cell case.

Batteries used in wireless electronic products are mainly used as a lithium ion battery that is a secondary battery capable of repeated charging and discharging. Since the life of the secondary battery is drastically reduced in the case of overcharge and overcurrent, one side of the battery body is packaged with a protection circuit module (PCM), which is a protection circuit module that prevents overcharge, overdischarge, and overcurrent of the secondary battery. Equipped with.

Conventional battery packs are spot-welded Ni-plate to the battery body, and then spot-weld the protection circuit module and the Ni-plate to manufacture the battery pack by connecting the protection circuit module (PCM) and the battery body. After assembling the insert molding parts at both ends of the battery main body to which the protection circuit module (PCM) is coupled as described above, the battery main body is wrapped with an outer film to clean the exterior to finish the packaging.

Here, the outer film surrounds them in a state where the battery body, the protection circuit module (PCM), the upper cap and the lower cap are assembled. The exterior film may be a sheet-like material or, in some cases, may be a thin molded structure having an inner surface corresponding to the outer surface shape of the battery body. The latter may be an integral or vertically separated molded structure with both ends open.

As described above, the conventional internal battery pack shown in FIG. 1 covers the upper and lower cases 2 and 3 after the electrical connection between the protection circuit module (PCM) and the battery body is performed by spot welding or soldering, and the exterior film 4 Packaging is completed by wrapping it in). The battery pack is inserted into the mobile phone main body to supply power to the mobile phone main body.

On the other hand, there is also a structure for manufacturing a simpler without using a case of the built-in battery pack. 2 is an exploded perspective view of a battery pack having such a simplified structure.

That is, after spot welding the Ni-plate to the battery body, the spot welding the PCM (15) and Ni-Plate to connect the PCM (15) and the battery cell 10 to manufacture a secondary battery (50). After assembling the insert molding parts 20 and 30 at both ends of the battery cell 10 to which the PCM 15 is coupled as described above, the battery cell 10 is wrapped with an outer film 40 to finish packaging.

However, the conventional secondary battery packaging structure as shown in Figures 1 and 2 is composed of a number of components, the structure is complicated, the productivity of the assembly process is reduced, leading to an increase in manufacturing cost.

In addition, several components are coupled to the secondary battery, the outer film surrounding the package of the secondary battery acts as a factor to increase the volume by the thickness, there was a problem that acts as a factor to lower the energy density per unit volume.

The present invention can improve the assembly efficiency by greatly simplifying the packaging process of the secondary battery and at the same time reduce the weight, volume and assembly cost of the packaged battery pack while improving the energy density per unit volume of the packaged secondary battery. An object of the present invention is to provide a secondary battery packaging structure.

The present invention provides a metal battery cell case including an electrolyte solution and an electrode assembly therein and having a positive electrode terminal and a negative electrode terminal at one side thereof; And a first insulating cap coupled to one side of the metal battery cell case to surround at least one of the positive electrode terminal and the negative electrode terminal.

In addition, the first insulating cap is characterized in that it comprises an opening means to selectively expose the negative electrode terminal.

In addition, the PTC element is integrally mounted on the upper end of the negative electrode terminal.

In addition, the positive electrode terminal and the negative electrode terminal is provided on one side of the battery cell case, it characterized in that it further comprises a second insulating cap that can surround the other side of the battery cell case.

In addition, the positive electrode terminal and the negative electrode terminal is formed on one side of the battery cell case, characterized in that it comprises a slot on the other side of the battery cell case.

In addition, it characterized in that it comprises a printing layer formed on at least a part of the surface of the battery cell case.

In addition, the printed layer is made of an insulating material to insulate the battery cell case from the outside.

According to the present invention, by attaching a structure including a short prevention insulating cap or a PTC to the battery cell and directly printing on the surface of the metal battery cell case, there is no need to use a conventional exterior film, reducing the production process, production cost Can be lowered.

In addition, the energy density per unit volume is an important management factor in the secondary battery provided mainly as a battery of a portable product, and the energy density per unit volume is increased by acting as a factor for reducing the volume by simplifying the packaging of the secondary battery.

In addition, since there is no need to use an outer film having a constant thickness, and thus can be used without a lower cap, it is possible to reduce the thickness of the battery and the weight of the battery.

And as well as labeling for the description of the product on the surface of the battery by various coating methods, there is an effect that can give an aesthetic appearance to the appearance of the battery cell.

In addition, the battery cell case may be directly coated on the surface of the battery to insulate the battery cell from the outside.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing a first embodiment of a secondary battery packaging structure according to the present invention.

In FIG. 3A, a first insulating cap and a second insulating cap which can be fitted to one side and the other side of the battery cell are separated, and FIG. 3B is a view illustrating a state in which the insulating cap is coupled to the battery cell case.

First, a battery cell generating electrical energy is shown, and the battery cell is fastened to an external device to produce a current. The protection circuit module PCM is not included to effectively prevent abnormal conditions such as overcharging and overdischarge of the battery cell, and the protection circuit module PCM is located in an external device. The negative terminal 103 connected to the negative electrode connecting member of the external device is positioned above the battery cell, and the positive terminal connected to the positive electrode connecting member may be the top surface 101 or the bottom surface 106 of the battery cell. . In addition, an electrolyte injection hole 104 is formed on the battery cell upper surface 101 to seal the electrolyte cell after injecting the electrolyte solution.

On the other hand, when the negative electrode terminal 103 and the positive electrode terminal 101 of the battery cell is in contact with an external conductor, etc., there is a risk of short-circuit and discharge. Therefore, the first insulating cap 230 is inserted into the battery cell case 100 to prevent short and discharge on one side of the battery cell in which the negative electrode terminal 103 is located. That is, the first insulating cap 230 is coupled to one side of the metal battery cell case so as to surround any one or more of the negative electrode terminal 103 and the positive electrode terminal 101. In addition, the first insulating cap 230 may be removed when combined with an external device, and may be combined with an external device. When the first insulating cap 230 is coupled without being removed, the first insulating cap 230 is positively coupled to the first insulating cap 230. Openable opening and closing means 231 and 233 may be positioned to selectively expose the terminal and the negative electrode terminal 103. Therefore, the opening means 231, 233 is opened when connected to the external device, and the opening means 231, 233 is closed during storage to prevent discharge or short circuit. In addition, the second insulating cap 240 may be located on the other side of the battery cell case 100, and the insulating caps 230 and 240 may be made of any material as long as the battery cap case 100 can be insulated from the outside. None, but preferably made of plastic. The insulating cap may be coupled to the battery cell by any known method, and in FIG. 3A, the second insulating cap is coupled by the double-sided tape 145.

3C is a view showing a state in which a PTC device is mounted on a negative electrode terminal. The PTC (Positive Temperature Coefficient) device 105 maintains a low resistance in a normal operating state and flows current, and in an abnormal state such as overcurrent or high temperature, the resistance rapidly increases with temperature rise, so that only a single current or a small amount of current flows. It serves to suppress the increase in battery internal pressure due to overheating. The PTC device 105 is integrally mounted on the upper end surface of the negative electrode terminal 103 and is bonded to the negative electrode terminal 103 by laser, spot welding, or soldering. As described above, when the secondary battery is coupled to the external device, the opening means 233 of the first insulating cap 230 is opened, and the PTC device 105 comes into contact with the connection terminal of the external device so that the current is connected to the external device. Will flow into.

In this manner, the battery cell case 100 into which the first insulating cap 230 and / or the second insulating cap 240 is fitted may be printed with information, design, and precautions for use of the product as described below. The other side of the battery cell case may have a slot formed as shown in FIG. 5, and a slot may be formed in the second insulating cap 240 correspondingly.

On the other hand, the outer case 100 of the battery cell may be formed of a metal of various materials, it is preferably formed of a light, easy to form aluminum. The aluminum case can be printed directly on the product's trademark, product information, design and usage precautions that generate people's purchasing power. The printed layer 150 may be made of an insulating material to insulate the battery cell case 100 from the outside.

In order to form a printed layer, there are various methods for inserting an image such as monochromatic or color patterns on a surface of a metal having high surface hardness, such as aluminum, stainless steel plate, or titanium, to decorate or labeling. As a printing method, a screen printing method, a flat plate printing method (offset printing method), etc. are mentioned, A detailed description is given below.

For example, screen printing includes a flat printing method and a curved printing method. Flat screen printing is a printing method for posters, corrugated cardboard, cotton cloth, and the like, and curved screen printing is for a side of cylindrical containers such as glass bottles and metal cans. First, screen mesh woven from nylon, polyester or stainless steel is fixed to the frame of wood or aluminum, and the valves are made on the surface by manual or photochemical methods to prevent parts other than the necessary images. When the ink is poured into it by a squeegee called a squeegee, it presses on the inside of the screen and moves through the mesh in the non-valve area where it is printed on a metal or other printed object under the plate. This screen printing method can be printed on not only flat printed materials but also curved surfaces such as cylinders and cones such as bottles and cups. In screen printing, various types of functional inks as well as aqueous and oil type can be used, so that printing can be performed on all materials and various conditions to satisfy the purpose. In the expressive effect, the color clarity is excellent and the built-in is excellent. It is also characteristic that the thickness of the ink can be freely selected. It is also possible to print thick with rough opaque ink.

Alternatively, off-set printing may be used, and there are no irregularities on the plate surface, but a lipophilic wire portion, which is a portion to which ink is attached by chemically treating the surface of the plate, and a hydrophilic portion, where water is adsorbed It is a printing method that uses the repellency of water and oil-based ink by forming a non-fired portion of. That is, a portion having a high affinity for ink as a wire portion and a portion having a low affinity for ink as a non-firing portion is formed on a printing plate, and ink is attached to the sensitive firing portion by giving water and ink to the plate surface, and the non-firing portion is formed of water. The ink does not adhere because it is covered with a thin layer. In this way, flat printing is a method of printing using the property that water and fat repel each other. In this way, the ink deposited on the caustic portion is transferred to a cylinder with elastic rubber blanket and then transferred from the blanket to the printed object. Indirect printing method. From the shape of this printing plate, the method of indirect printing via a blanket is called flat printing. Flat printing is free in color, excellent in tone reproducibility, easy to plate and stable. However, there is a disadvantage that the color tone is unstable and the printer is complicated.

In addition to the above-described method, it can be printed in any method that can be printed on a metal can, as well as dry offset printing, gravure printing, flexographic printing (flexography printing) And ink-jet printing.

4 is a view showing a second embodiment according to the present invention.

4A is an exploded view illustrating the battery cell and the insulating upper cap coupled to the battery cell. The upper cap includes a protection circuit module, and an insulating mounting member for insulating the protection circuit module and the battery cell is positioned.

The secondary battery packaging structure includes a metal battery cell case 100 in which an electrode assembly is sealed inside a battery case together with an electrolyte solution, a PCM assembly 110 that effectively controls abnormal conditions such as overcharge, and a PCM assembly 110 on the top. Is mounted on the upper surface of the metal battery cell case 100 while surrounding the insulating mounting member 120 in a state where the insulating mounting member 120 and the PCM assembly 110 are mounted on the upper surface of the metal battery cell case 100. Insulating upper cap 130 is coupled to, the lower end of the battery cell case 100 includes an insulating lower cap 140 is coupled by a double-sided tape 145 or the like.

The upper surface of the metal battery cell case 100 is formed with a negative electrode terminal 103 protruding upward in an insulated state from the metal battery cell case 100, and the remaining portion except for the negative electrode terminal 103 is the positive electrode terminal 101. ), And the insulating mounting member 120 is interposed therebetween to achieve mutual insulation. The PTC device 105 may be coupled to the positive electrode terminal 101, and the electrolyte injection part 104 sealed by the metal ball, the polymer resin, or the like protrudes in a planar circular shape on the opposite side. In some cases, the PTC device 105 may be formed in the PCM assembly 110, and an anode connection member (not shown) extending from the PTC device 105 may be electrically connected to the anode terminal 101.

The insulating mounting member 120 is mounted on and coupled to the upper surface of the metal battery cell case 100 by a known adhesive method, and the insulating mounting member so that the protruding negative electrode 103 of the battery cell 100 is exposed upward. The first opening 121 is formed in the central portion of the 120, and the second opening 122 is formed in the right portion so that the upper surface of the PTC element 105 can be exposed. In addition, a third opening 123 is formed at the left side to expose the sealed electrolyte injection unit 104 to the upper portion, and an input / output terminal 113 which is connected to an external device (not shown) is formed. .

In the PCM assembly 110, two connection through holes 111 and 112 are perforated, and a connection member is coupled to a lower surface of the PCM assembly 110 to seal the connection through holes. Provide electrical connections between them.

The insulating upper cap 130 is coupled to the upper end of the metal battery cell case 100 while surrounding the insulating mounting member 120 in the state where the PCM assembly 110 is mounted, and the outer surface of the upper end of the battery cell case 100. It extends downward to a predetermined length so as to be wrapped, and an A / S label 132 is attached to one side of the upper surface. In addition, the insulating upper cap 130 has an opening 135 for exposing the input / output terminal 113 of the PCM assembly to an external device (not shown), and accommodates the PCM assembly 110 to produce electrical energy. It is coupled to the battery cell case 100, and the printing layer 150 is directly formed on the surface of the metal battery cell case 100.

An insulating lower cap 140 may be provided below the metal battery cell case 100, and a recess 141 is provided at a predetermined position of the insulating lower cap 140 to mount the secondary battery package to an external device. When it is, it is possible to prevent the relative flow of the secondary battery package with the recess 137 formed in the insulating upper cap 130.

In addition, Figure 4b shows a cross-sectional view of the bonded state of the secondary battery shown in exploded perspective view in Figure 4a.

The metal battery cell case 100 is usually formed of aluminum or the like. The upper cap 130 or the lower cap 140 is formed in the metal battery cell case 100 as described above, that is, a known method, that is, a separate bolt or screw It is coupled using a fastening member of, or coupled by a double-sided tape, such as taping, bonding or forced pressing of the insert mold to minimize the possibility of separation.

5 is a perspective view showing a third embodiment of the secondary battery packaging structure according to the present invention.

5A illustrates a state in which the print layer 150 is formed on the battery cell case 100, and FIG. 5B is a perspective view including a bottom surface 106 of the battery cell case 100. The battery cell may be connected to an external device in a state in which only the printing is performed on the battery cell case 100 without inserting an insulation cap. A plurality of slots 107 may be symmetrically formed on the bottom surface 106 of the battery cell so that the battery cell is fixed when the battery cell is mounted on an external device. In addition, between the left and right slots 107, there is an annular flat portion 108 in which terminals are positioned during the aging process and the charge and discharge experiments.

In any case, in the present invention, an example of the printed layer 150 is briefly shown in FIGS. All types of designs, including details and the like, are displayed on the surface of the metal battery cell case by direct printing.

As described above, the secondary battery can be connected to an external device by combining a minimum component, and there is no need to use an exterior film that has been provided. Accordingly, it is possible to delete the volume that acted as a loss in terms of energy density per unit volume of the secondary battery package by the thickness of the outer film. That is, the thickness of the outer film is in the unit of millimeters (several millimeters or less), whereas the thickness of the printed layer formed on the surface of the metal battery cell case is in the micrometer unit (hundreds of micrometers or less), so that the volume can be reduced. In addition to increasing the energy density per unit volume, the weight and volume of the secondary battery package can be reduced.

As the printing method that can be applied to the surface of the metal battery cell case, any known printing method, whether wet or dry, may be adopted. However, displaying a model number or the like on the surface of a metal battery cell case by a conventional printing method is not a printing object of the present invention. The printing of the present invention is carried out over a substantial area on at least one of the front, rear, left and right sides of the metal battery cell case. That is, the print layer 150 may be provided with a pattern such as a flower shape, and precautions for use of the secondary battery may be displayed on the remaining portion of the margin.

In any case, the printed metal battery cell case 100 may be printed on itself, or alternatively, a printing layer may be applied to an aluminum sheet to constitute the metal battery cell case 100 in advance, and then the metal battery cell case may be cut out. It may be used to make 100).

In addition, the coating on the surface of the case of the battery cell made of aluminum may start at one side of the battery case, rotate 360 ° to end at the beginning, and the coating on one side and the coating on the other side may be made separately. There is also. That is, the coating is made on the surface of the battery cell case by various methods.

6 is a view showing a state where a secondary battery according to the present invention is accommodated in a mobile phone which is an electronic product.

An external device (electronic product) including a space for accommodating a secondary battery to which the first insulating cap 230 is coupled is electrically connected to a positive electrode terminal and a negative electrode terminal when accommodating a secondary battery, thereby overcharging and overdischarging therein. It will contain a PCM assembly to prevent it. In addition, the PCM assembly may include a PTC device that the resistance is rapidly increased when the temperature rises. When the battery cell 100 to which the first insulating cap 230 is coupled is inserted into the mobile phone 400, the mobile phone 400 operates. In this case, the opening means 231 and 233 attached to the first insulating cap 230 are opened to connect with a connection member (not shown) of the external device. 450 denotes a battery cell cover. 6 illustrates a state in which the secondary battery 100 is coupled to the mobile phone 400, of course, the secondary battery 100 may be used in all of the electronic products that can use the secondary battery 100 as a power source.

In the above, the present invention has been described in detail based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

1 is an exploded perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.

2 is a schematic diagram of a structure in which connection members are coupled to the bottom surface of the PCM assembly.

3A is a perspective view showing a first embodiment of a secondary battery packaging according to the present invention.

3B is a cross-sectional view illustrating a structure in which a battery cell and an insulating cap are coupled in the first embodiment.

Figure 3c is a perspective view showing a state in which the PTC device is integrally mounted on the negative electrode terminal in the first embodiment according to the present invention.

Figure 4a is a perspective view showing a second embodiment of a secondary battery package according to the present invention.

Figure 4b is a cross-sectional view showing a structure in which the battery cell and the insulating cap is coupled in the second embodiment.

Figure 5a is a perspective view showing a third embodiment of the secondary battery packaging according to the present invention.

5B is a perspective view showing a lower portion of the third embodiment according to the present invention.

6 is a perspective view showing a state in which a mobile phone, which is an electronic product according to the present invention, is separated from a secondary battery.

Claims (7)

A metal battery cell case having an electrolyte solution and an electrode assembly therein and having a positive electrode terminal and a negative electrode terminal at one side thereof; And And a first insulating cap coupled to one side of the metal battery cell case so as to surround at least one of the positive electrode terminal and the negative electrode terminal, wherein the first insulating cap may selectively expose one or more of the positive electrode terminal and the negative electrode terminal. A rechargeable battery packaging structure comprising an opening and closing means. The method of claim 1, A secondary battery packaging structure characterized in that the PTC element is integrally mounted on the upper end of the negative electrode terminal. The method of claim 1, The secondary battery packaging structure of claim 1, wherein the positive electrode terminal and the negative electrode terminal are provided on one side of the battery cell case, and further include a second insulating cap that may surround the other side of the battery cell case. The method according to any one of claims 1 to 3, The positive electrode terminal and the negative electrode terminal is formed on one side of the battery cell case, the secondary battery packaging structure comprising a slot on the other side of the battery cell case. The method according to any one of claims 1 to 3, A secondary battery packaging structure comprising a printing layer formed on at least a portion of the surface of the battery cell case. The method of claim 5, The printed layer is made of an insulating material to insulate the battery cell case from the outside, characterized in that the secondary battery packaging structure. delete

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