KR100858808B1 - Rectangular- type secondary battery and battery package therewith - Google Patents

Abstract

According to an aspect of the present invention, an electrode assembly in which a positive electrode plate and a negative electrode plate are alternately wound with a separator interposed therebetween; A first and a second flat portion extending in parallel to each other and a side portion connecting the first and the second flat portion, the long sides on both sides of the first flat portion at a right angle to the adjacent side portion and the long sides on both sides of the second flat portion A can of which side is curved with an adjacent side portion; Disclosed is a rectangular secondary battery having a cap assembly for sealing an upper opening of the can. In addition, according to another aspect of the present invention, the rectangular secondary battery; Disclosed is a pack battery including a lower case in which a second flat portion of the rectangular secondary battery is seated, and a case in which a rectangular secondary battery is built, including an upper case coupled to a lower case on an upper portion of the first flat portion. According to the disclosed rectangular secondary battery and a pack battery using the same, while maintaining the shape of the can to be suitable for the internal shape of the case in which the can is embedded, the pressure inside the can is increased to effectively reduce the swelling phenomenon that is expanded.

Description

Rectangular type secondary battery and pack battery having same {{Rectangular-type secondary battery and battery package therewith}

1 is an exploded perspective view briefly illustrating an example of a typical pack battery having a rectangular secondary battery;

FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 and showing a conventional pack battery in which a rectangular secondary battery is incorporated;

3 is a cross-sectional view showing a rectangular secondary battery according to the present invention;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2, and illustrates a pack battery having a rectangular secondary battery illustrated in FIG. 3.

<Description of Symbols for Major Parts of Drawings>

20 ... case 21,22 ... top, bottom case

100 ... square rechargeable battery 110 ... can

110a to 110d ... Corner part 111,112 ...

113,114 ... side 120 ... electrode assembly

130 ... cap assembly

The present invention relates to a rectangular secondary battery and a pack battery containing the same, and more particularly, to a rectangular secondary battery having an improved shape of a can to reduce a swelling phenomenon caused by an increase in pressure inside the can of the rectangular secondary battery; It relates to a pack battery containing this.

In general, the secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used in the field of advanced electronic devices such as a cellular phone, a notebook computer, and a camcorder. In particular, lithium secondary batteries have a working voltage of 3.6V, which is three times higher than nickel-cadmium batteries or nickel-hydrogen batteries, which are widely used as power sources for electronic equipment, and are rapidly increasing in terms of high energy density per unit weight. .

Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. The lithium secondary battery is manufactured in various shapes, and typical shapes include a square shape, a cylindrical shape, and a pouch type.

1 is an exploded perspective view schematically illustrating an example of a typical pack battery having a rectangular secondary battery, and FIG. 2 is a cross-sectional view of a conventional pack secondary battery having a rectangular secondary battery corresponding to the AA line of FIG. 1. It is.

As shown in FIG. 1, the pack battery includes a rectangular secondary battery 1 and a case 20 including upper and lower cases 21 and 22 and a built-in rectangular secondary battery 1. . Here, as shown in FIG. 2, the can 10 of the rectangular secondary battery 1 includes first and second planar portions 11 and 12 extending in parallel to each other and the first and second planar portions. (11) (12) includes a side portion (12) (14) connecting, wherein the long side edge portions (10a, 10b, 10c, 10d) of the first and second plane portions (11, 12) are adjacent side portions It forms a curved surface with (13) (14).

Meanwhile, in the rectangular secondary battery 1, a swelling (S) phenomenon in which the can 10 swells due to an increase in pressure inside the can 10 occurs. When such swelling phenomenon becomes excessive, the battery pack mounted in the electronic product such as a mobile phone set is separated from the electronic product.

However, since the long side edge portions 10a, 10b, 10c, and 10d of the first and second planar portions 11 and 12 have a curved shape, they are vulnerable to swelling, which is illustrated in FIG. As shown, there was a problem that the can 10 is excessively inflated.

The present invention has been made in view of the above problems, and provides a rectangular secondary battery and a pack battery including the same in which the shape of the can is improved to reduce the swelling phenomenon caused by an increase in pressure inside the can of the rectangular secondary battery. Its purpose is to.

According to an aspect of the present invention, a rectangular secondary battery includes: an electrode assembly in which a positive electrode plate and a negative electrode plate are alternately wound with a separator interposed therebetween; A first side portion extending in parallel with each other, and a side portion connecting the first side portion and the first side portion, wherein both sides of the first side of the first side are formed at right angles with the side portions adjacent to the side portion, and the long side side of the second side portion A can forming a curved surface with a side portion adjacent to both corners; And a cap assembly for sealing the top opening of the can.

In addition, according to another aspect of the present invention, the electrode assembly including the anode plate and the cathode plate wound alternately between the separation membrane, and the first and second planar portion extending in parallel to each other and the side portion connecting the first and second plane portion And a can formed at a right angle with both side portions of the first side of the first flat portion at a right angle, and having a curved surface with a side portion of the second side of the second flat portion adjacent to each other, and a cap assembly sealing a top opening of the can. Square secondary battery and; And a case including the lower case in which the second flat portion of the rectangular secondary battery is seated and the upper case coupled to the lower case on the upper portion of the first flat portion.

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

3 is a cross-sectional view illustrating a rectangular secondary battery according to the present invention, and FIG. 4 is a cross-sectional view corresponding to the line A-A of FIG. 2 and illustrates a pack battery in which the rectangular secondary battery shown in FIG. 3 is incorporated.

Referring to the drawings, a pack battery according to a preferred embodiment of the present invention includes a case including a rectangular secondary battery 100, the upper case 21 and the lower case 22 to incorporate the rectangular secondary battery 100 ( 20).

The rectangular secondary battery 100 and the can (110). An electrode assembly 120 accommodated in the can 110 and a cap assembly 130 for sealing an upper opening of the can 110 are provided. Although not shown, an electrolyte solution that is moistened in the electrode assembly 120 is injected into the can 110. The electrode assembly 120 is alternately wound between the positive electrode plate 121 and the negative electrode plate 122 with the separator 123 interposed therebetween, and the positive electrode tab 132 and the negative electrode are separated from the positive electrode plate 121 and the negative electrode plate 122. The tabs 131 are each drawn out. The cap assembly 130 is a cap plate 134 electrically connected to the positive electrode tab 132 and coupled to an upper portion of the can 110, and insulated from the cap plate 134 and the negative electrode tab 131. And a negative electrode terminal 133 electrically connected thereto.

Meanwhile, the can 110 includes first and second planar portions 111 and 112 extending in parallel with each other, and side portions 113 and 114 connecting the first and second planar portions 111 and 112. It includes. Here, the long side sides 110a and 110b of the first flat portion 111 form a right angle with adjacent side portions 113 and 114, and the long side sides of the second flat portion 112. Corner portions 110c and 110d form a curved surface with adjacent side portions 113 and 114.

In the embodiment of the present invention configured as described above, the square secondary battery 100 has its second flat portion 112 is seated on the inner bottom surface of the lower case 122. In addition, the upper case 121 is coupled to the lower case 122 at the upper portion of the first flat portion 111 to embed the rectangular secondary battery 100.

Accordingly, according to the rectangular secondary battery 100 and the pack battery having the same according to an embodiment of the present invention, the long side sides of the first flat portion 111 of the rectangular secondary battery 100 may have both corner portions 110a and 110b. Since is perpendicular to the adjacent side portions 113, 114, it is relatively less bulging compared to the conventional curved surface. Therefore, it is possible to improve the problem that the battery pack mounted on the electronic product is separated from the electronic product due to excessive sling phenomenon.

On the other hand, the long side sides of the second flat portion 112 of the rectangular secondary battery 100, both corners (110c, 110d) of the side surface 113 and 114 are adjacent to the curved surface and the second flat portion 112 Since the inner edge portion of the lower case 122 is seated is curved surface, the can 110 and the case 120 of the rectangular secondary battery 100 when the rectangular secondary battery 100 is embedded in the case 120 as in the prior art. The suitability of can be maintained as it is.

As described above, according to the rectangular secondary battery and the pack battery having the same according to the present invention, a swelling phenomenon in which the pressure inside the can increases due to an increase in the pressure inside the can while maintaining the shape of the can to be suitable for the internal shape of the case in which the can is embedded is provided. Can be effectively reduced.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely an example, and those skilled in the art may realize various modifications and equivalent other embodiments therefrom. I will understand. Therefore, the true scope of protection of the present invention should be defined by the technical spirit of the appended claims.

Claims (2)

An electrode assembly in which a positive electrode plate and a negative electrode plate are alternately wound with a separator interposed therebetween; A first side portion extending in parallel with each other, and a side portion connecting the first side portion and the first side portion, wherein both sides of the first side of the first side are formed at right angles with the side portions adjacent to the side portion, and the long side side of the second side portion A can forming a curved surface with a side portion adjacent to both corners; And a cap assembly that seals an upper opening of the can. An electrode assembly in which a positive electrode plate and a negative electrode plate are alternately wound between separators, and first and second plane parts extending in parallel with each other, and side parts connecting the first and second plane parts, and both edges of the long sides of the first plane part. A rectangular secondary battery having a can perpendicular to an adjacent side portion and having a curved surface with an adjacent side portion at both edges of the second flat portion, and a cap assembly sealing an upper opening of the can; And a case including the lower case in which the second flat portion of the rectangular secondary battery is seated and the upper case coupled to the lower case on the upper portion of the first flat portion to embed the rectangular secondary battery. .

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