KR100875109B1 - Bendable battery - Google Patents

Abstract

According to the present invention, there is provided a battery unit comprising a cathode active material pellet formed by press molding and a separator disposed between the anode active material pellet and the cathode active material pellet and the anode active material pellet; A lead interconnecting a plurality of the battery units; And an exterior member having flexibility to surround the plurality of battery units.

Description

Bendable Battery

1 is a schematic cross-sectional view of a conventional button cell.

Shown in Figure 2 is a schematic perspective view of a portion of a bendable cell according to the present invention.

3 illustrates that the units of the battery are connected in series with the exterior material removed.

4 is a cross-sectional view schematically illustrating that the unit parts of the batteries connected in series in FIG. 3 are wrapped with an exterior material.

5 is a perspective view of the battery described with reference to FIGS. 3 and 4.

6 illustrates that the units of the battery according to the present invention are connected in parallel and in series, and are shown in a state where the exterior material is removed.

7 illustrates that the unit of the battery illustrated in FIG. 6 is wrapped with an exterior material.

8 and 9 illustrate another embodiment of a bendable battery according to the present invention.

10 is a perspective view of a battery in which the unit of the battery is formed in a quadrangle rather than a circle.                 

<Brief Description of Major Codes in Drawings>

11.12.Film exterior material 13.17. House

14.16. Active Material Pellet 15. Separator

18.19. Reid 51.52. Exterior material

The present invention relates to a bendable battery, and more particularly, to a bent battery formed by connecting unit cells in series or in parallel and forming an outer case with a flexible multilayer packaging.

Typically, batteries have various shapes depending on their use. For example, the most common form of cell is a cylindrical or cuboid type. In another example, a pouch type battery is used, in which the battery is embedded in a pouch formed of aluminum. In another example, a button type battery is used, which has a very thin button shape and is widely used for various purposes. For example, button cells are widely used as batteries in wrist watches. In another example, a button cell is provided as a power source for devices that display the date and time in electronic devices such as computers, cameras, camcorders, and the like.

Typically, a button-type battery is constructed by receiving electrode active material pellets in a case made of a cup and a can, and the cup and the can have a function of a terminal to an external circuit. Therefore, in order to install a button-type battery, a battery holder capable of accommodating a battery having a thin button shape is required.

1 is a schematic cross-sectional view of a conventional button cell.

Referring to the drawings, in the button-type battery, the positive electrode active material pellets 2 are filled inside the can 1, and the negative electrode active material pellets 4 are filled inside the cup 3. The cup 3 is installed in an inverted manner in a manner that seals the open inlet of the can 1. The positive electrode active material pellets 2 and the negative electrode active material pellets 4 are separated from each other by the separator 5. Denoted by reference number 6 is a gasket.

Since the button-type battery illustrated in FIG. 1 is very small in size, it may be applied to small electronic products such as wrist watches. However, the button-type battery has a disadvantage in that its life span is not long when it is applied to an electronic product that requires a lot of power because the battery capacity is small. In addition to button-type batteries, all other types of batteries are limited in shape since the outer case is made of hard metal, and a separate space for inserting such a limited type battery must be provided in the electronic product. There is this.

The present invention has been made to solve the above problems, an object of the present invention to provide an improved bendable battery.

Another object of the present invention is to provide a bendable battery that can be adapted to the requirements of the electronic product in which the battery is used and can extend its service life.                         

Another object of the present invention is to provide a bendable battery that can be applied without a space provided inside the electronic product.

In order to achieve the above object, according to the present invention, a battery unit consisting of a positive electrode active material pellets formed by press molding and a separator disposed between the negative electrode active material pellets and the positive electrode active material pellets and the negative electrode active material pellets; A lead interconnecting a plurality of the battery units; And an exterior member having flexibility to surround the plurality of battery units.

According to one aspect of the invention, the aluminum current collector to which the positive electrode active material pellets are further provided, and a copper current collector to which the negative electrode active material pellets are further bonded, and the leads are welded on the current collector.

According to another feature of the invention, the leads connect the units of the battery in series.

According to another feature of the invention, the leads connect the units of the battery in parallel.

According to another feature of the invention, the packaging material is formed in a multi-layer structure.

According to another feature of the invention, the facer is formed of any one of aluminum, non-woven fabric, paper, polyolefin, nylon.

According to another feature of the invention, the plane of the unit of the battery may be formed in the shape of any one of circular, square, pentagonal, hexagonal, rhombus, or diamond.

Hereinafter, with reference to an embodiment of the present invention shown in the accompanying drawings, the present invention will be described in more detail.

Shown in Figure 2 is a schematic perspective view of a portion of a bendable cell according to the present invention.

Referring to the drawings, the unit of the bendable battery according to the present invention is a positive electrode plate made of a positive electrode active material pellets 14 disposed on the current collector 13, and a negative electrode active material pellets 16 disposed on the current collector 17 And a separator plate 15 disposed between the cathode plate and the anode plate, the cathode plate, the anode plate, and the multilayer packaging material 11 and 12 surrounding the separator 15. The positive electrode lead 19 is connected to the current collector 13 of the positive electrode plate and is drawn out of the multilayer exterior materials 11 and 12 or connected to a unit of another battery, and the negative electrode lead 18 is connected to the current collector of the negative electrode plate ( 17) is drawn out of the film packaging materials 11 and 12 or connected to other battery units. The multilayer packaging materials 11 and 12 shown in FIG. 2 are formed in two layers, respectively.

It is preferable that the electrical power collector 13 of a positive electrode plate is an aluminum material. The aluminum current collector 13 is manufactured in a very thin thickness and may have the form of a web. On the other hand, it is preferable that the electrical power collector 17 of a negative electrode plate is a copper material. In addition, the current collector 17 made of copper may also have the form of a web.

The positive electrode active material pellets 14 and the negative electrode active material pellets 16 are obtained by processing a positive electrode and a negative electrode active material into a predetermined thickness and shape by press molding. It is preferable that the pellets 14 and 16 and the collector 17 corresponding thereto are in the shape of a thin disk. However, in other forms, various shapes may be applied, for example, rectangular or pentagonal, or hexagonal, rhombic, or diamond. The active material may be any material commonly used in button-type batteries or other general primary or secondary batteries. In order to improve the workability of processing the active material into pellets of a predetermined shape, a conductive agent and a binder may be added. Separators may also be made of materials commonly applied in batteries.

The positive electrode lead 19 is spot welded on the current collector 13 of the positive electrode plate, and the negative electrode lead 18 is spot welded on the current collector 17 of the negative electrode plate. The positive electrode lead 19 should extend along the sides of the negative electrode and the positive electrode active material pellets 14 and 16 so that they can be drawn out through the exterior materials 11 and 12. At this time, it is preferable to insulate the positive electrode lead 19 so that the positive electrode lead 19 does not come into contact with the negative electrode active material pellets 16 or the disk-shaped current collector 17 of the negative electrode plate. On the contrary, the insulating treatment may be performed on the negative electrode active material pellets 16 or the current collector 17 of the negative electrode plate. The insulation treatment can be made in various ways, for example, using an insulation tape or an insulation coating.

The exterior materials 11 and 12 are preferably formed of an aluminum material. In another example, any flexible material can be applied, and non-woven fabric, paper, polyolefin, nylon, and the like can be used by heat compression. The exterior materials 11 and 12 are preferably formed by stacking two or more layers in multiple layers so that no damage occurs even when the battery is bent several times. The outer packaging material 11 disposed on the upper portion is formed in a cylindrical shape as shown in the drawing, and surrounds the current collector and the active material pellets of the packaging material 11. On the contrary, the exterior member 12 disposed below has a planar shape to correspond to the bottom edge of the upper film-like exterior member. In fact, since the battery unit is very thin, the degree to which the upper packaging material 11 protrudes from the plane becomes very small.

The positive electrode lead 19 and the negative electrode lead 18 are connected to another battery unit extending or proximate through the bonding surface of the film-like packaging materials 11 and 12. Many of the battery units may be housed in the same top and bottom exterior packaging material, and may be connected in parallel or in series.

It is to be understood that a structure in which the current collectors 13 and 17 are omitted in the unit of the battery shown in FIG. 2 is possible. In this case, each lead 18, 19 can be bonded directly to the active material pellets.

3 illustrates that the units of the battery are connected in series with the exterior material removed.

Referring to the drawings, it can be seen that the units 31, 32 and 33 of the battery are arranged in a straight line, and the leads 35 and 36 are connected to the units 31, 32 and 33 in series. have. The other leads 34 and 37 are for drawing out of the exterior material to be connected to an external circuit.

4 is a cross-sectional view schematically illustrating that the unit parts of the batteries connected in series in FIG. 3 are wrapped with an exterior material.                     

Referring to the drawings, the unit units 31, 32, 33 of the battery are connected in series with each other, but the connection lead is omitted for convenience of illustration. A lower first layer 41 and a lower second layer 42 are surrounded by a packaging material under the unit of the battery, and an upper first layer 43 and an upper second layer 44 are disposed above the unit of the battery. Wrapped by The shells of the layers are pressed against each other so that the units of the battery are insulated from each other, and are electrically connected to each other only through the connecting leads. In addition, since the flexible packaging material is pressed against each other in a layer, it can be bent freely about an axis that does not pass through the unit (31, 32, 33).

5 is a perspective view of the battery described with reference to FIGS. 3 and 4.

Referring to the drawings, the lower packaging material 51 and the upper packaging material 52 formed in a multilayer structure surround each battery unit in the upper and lower parts. Where the battery unit is incorporated, as shown by the reference numeral 55 protrudes convexly, the degree of protruding in practice is insignificant. In addition, it can be seen that the lead terminals 34 and 37 protrude to the outside between the junction of the lower sheath 51 and the upper sheath 52.

The cell as shown in FIG. 5 can be bent around an axis denoted by X1-X1 and X2-X2. That is, since the packaging materials 51 and 52 are formed in a multilayer, they can be bent by adopting a flexible material as the packaging material while having rigidity that is not broken by repeated bending.

6 illustrates that the unit of the battery according to the present invention is connected in parallel and in series, it is shown in a state in which the exterior material is removed.

Referring to the drawings, the first group of cells is three battery units (61, 62, 63) are connected in parallel with each other, the second group of cells is three battery units (64, 65, 66) in parallel to each other Is connected. That is, the leads 67 and 68 interconnect the electrodes of the same polarity between the cell groups 61, 62 and 63 of the first group, and the other leads 69 and 70 are the cell units of the second group. The electrodes of the same polarity are interconnected between 64, 65 and 66. Therefore, the battery units of the first group and the battery units of the second group are connected in parallel to each other in the same group. In addition, the lead 71 connects one electrode of the battery unit of the first group and one electrode of the battery unit of the second group with different polarities, and the electrode of the battery unit 63 of the first group. The lead 72 withdrawn from the lead and the lead 73 withdrawn from the electrode from the battery unit 66 of the second group become terminals for connection to an external circuit.

7 illustrates that the unit of the battery illustrated in FIG. 6 is wrapped with an exterior material.

Referring to the drawings, the lower casing 75 formed in multiple layers and the upper casing 76 formed in multiple layers surround each battery unit. The leads 72 and 73 are drawn out of the exterior materials 75 and 76.

In FIG. 7, the battery wrapped with the packaging materials 75 and 76 can be bent not only about the axes of X 1 -X 1 and X 2 -X 2, but also about the axes of Y 1 -Y 1 perpendicular to the axes. . Moreover, as shown in FIG. 6, the cells are connected in parallel and in series, thereby providing the required voltage and service life.

8 and 9 illustrate another embodiment of a bendable battery according to the present invention.

Referring to FIG. 8, as described above, the units of the battery are enclosed in the packaging material. At this time, each of the battery unit of the battery group arranged in a straight line, are arranged in a shape that is staggered with respect to each of the battery unit of the other battery group arranged in a straight line. As a result of the placement of each such cell unit, as shown in FIG. 8, the cell is not only in the Y1-Y1, Y2-Y2, Y3-Y3 axes, but also Z0-Z0, Z1-Z1, Z2-Z2, Z3-Z3 and , Z4-Z4 can be bent around its axis.

Meanwhile, referring to FIG. 9, four battery units are arranged in a shape corresponding to the vertex of the rhombus to form four groups. As a result, the battery is XX, Y1-Y1, Y2-Y2, Y3-Y3, Y4-Y4, Y5-Y5 and Z1-Z1, Z2-Z2, Z3-Z3, Z4-Z4, Z5-Z5, and Z6 Bend around the axis of -Z6.

 8 and 9, the connection method of each battery unit has not been described, but by referring to the description of FIGS. 3 and 6, it can be seen that the battery units can be connected in series and in parallel according to the intended purpose. Could be.

10 is a perspective view of a battery in which the unit of the battery is formed in a quadrangle rather than a circle. Units of the battery wrapped in the upper and lower outer packaging material (101, 102) is formed in a square, so that the portion protruding to the outside of the upper packaging material 102 has a rectangular shape as a whole.

The bendable battery according to the present invention has the advantage that the battery can be bent around a plurality of axes by manufacturing the unit of the battery using an active material pellet and wrapped in a multilayer using a flexible material. Therefore, the battery can be made in various forms, and the utilization of the space for accommodating the battery in the electronic product becomes more diverse. For example, when a bendable battery is applied to a wrist watch, the battery life may be extended by embedding the battery in the strap of the watch. In addition, by placing a bendable battery in the empty space in the external molding of the electronic product, the empty space may be actively utilized. In addition, by connecting the unit of the battery provided in the battery in series and in parallel to suit the desired purpose has the advantage that it can provide a variety of voltage and service life.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the protection scope of the present invention should be defined only by the appended claims.

Claims (7)

A battery unit composed of a positive electrode active material pellet formed by press molding and a separator disposed between the negative electrode active material pellet and the positive electrode active material pellet and the negative electrode active material pellet; A lead interconnecting a plurality of the battery units; And, Wrapping the plurality of battery units, comprising a packaging material made of any one of aluminum, non-woven fabric, paper, polyolefin, nylon material, a bendable battery. The method of claim 1, And an aluminum current collector to which the positive electrode active material pellets are bonded, and a copper current collector to which the negative electrode active material pellets are bonded, wherein the leads are welded onto the current collector. The method of claim 1, The leads are bendable cells, characterized in that for connecting the units of the battery in series. The method of claim 1, The leads are bendable battery, characterized in that for connecting the units of the battery in parallel. The method of claim 1, The exterior material is a bent battery, characterized in that formed in a multi-layer structure. delete The method of claim 1, The plane of the unit of the battery is a bent battery, characterized in that formed in the shape of any one of circular, square, pentagonal, hexagonal, rhombus, or diamond.

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