KR20050020357A - Pouch case and pouched type secondary battery comprising the same - Google Patents

Abstract

PURPOSE: Provided is a pouch-typed secondary battery which lets a projection part formed at the bottom of a pouch case to secure infiltration space of electrolytes and uniform space in a final product so that it prevents a battery part from being twisted. CONSTITUTION: The pouch-typed secondary battery comprises the parts of: the battery part(300) which is composed of a cathode plate, an anode plate and a separator between both plates; an electrode terminal(302) which is extended from the cathode and the anode plate; the pouch case(304) which includes a space part(202) to house the battery part and the projection part(204) formed by projecting the projection part outwardly; and electrolytes which are inserted into the pouch case having the battery part.

Description

Pouch case and pouch type secondary battery having same {Pouch case and pouched type secondary battery comprising the same}

The present invention relates to a pouch type secondary battery, and more particularly, to a pouch type secondary battery provided with a pouch case protruding a part of the bottom surface.

In general, secondary batteries are rechargeable, compact, and large in capacity, and typically, nickel-hydrogen (Ni-MH) batteries and lithium (Li) secondary batteries are used.

The secondary battery may be classified into a cylindrical battery using a cylindrical aluminum can, a square battery using a square aluminum can, and a pouch type battery housed in a thin pouch case according to the appearance of a case containing an electrode assembly.

1A and 1B are schematic perspective views illustrating a conventional electrode assembly and a pouch type secondary battery having the same.

1A and 1B, the pouch type secondary battery includes an electrode assembly 100 that generates a predetermined current, and a pouch case 110 that receives and seals the electrode assembly 100.

The electrode assembly 100 is formed by stacking or winding a positive electrode plate and a negative electrode plate through a separator, and have an electrode terminal 102 including positive and negative terminals extending from each electrode plate. .

The pouch case 110 includes a case body 112 having an inner space provided therein so that the electrode assembly 100 can be seated, and a cover 114 extending integrally from one end of the case body 112. The flange 116 is formed at the edge of the case main body 112 to be joined to the cover 114 to seal the case main body 112.

In the pouch case of the conventional pouch type secondary battery described above, the shape of the bottom surface of the space portion is the plane 118.

Accordingly, a technical object of the present invention is to provide an electrode assembly for a pouch type secondary battery provided with means for distinguishing the positive electrode and the negative electrode of the electrode residue.

Another object of the present invention is to provide a pouch type secondary battery having the electrode assembly.

In order to achieve the above technical problem, the pouch case according to the present invention, the battery compartment is accommodated; And a protrusion formed to protrude outward from the space. The protrusion may be formed at the center of the space part. In addition, the protrusion may be formed at one side of the space part. In addition, the protrusion may be formed to be stepped with the space part.

In order to achieve the above technical problem, the pouch type secondary battery according to the present invention includes a battery unit having a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate; An electrode terminal extending from the positive electrode plate and the negative electrode plate; A pouch case having an upper case and a space part coupled to the upper case and accommodating a battery unit, the bottom surface of the space part protruding outward; And an electrolyte solution injected into the pouch case accommodating the battery unit. Here, the protrusion provided in the pouch case may be formed in the center of the space portion. In addition, the protrusion may be formed at one side of the space part. In addition, the protrusion may be formed to be stepped with the space part.

According to the present invention, by forming a protrusion on the bottom surface of the pouch case, there is an effect to secure the electrolyte impregnation space, to secure a certain space in the finished product to prevent warpage of the battery unit.

Hereinafter, with reference to the accompanying drawings the configuration and operation of the pouch case and a pouch type secondary battery having the same according to the present invention will be described in detail.

2 is a schematic perspective view illustrating a pouch case according to an exemplary embodiment of the present invention, which includes a case cover 200, a space 202, and a protrusion 204.

The space part 202 accommodates a battery part of a pouch type secondary battery. In the present invention, the bottom surface of the space portion 202 is formed to protrude outward. In other words, the protrusion 204 is formed by protruding the bottom surface of the space 202 in the direction in which the volume of the space 202 increases.

The pouch cover 200 covers the space portion 202 when the pouch case is sealed. A flange 206 is formed at the edge of the space portion 202 so as to be joined to the pouch cover 200 to seal the space portion 202.

3 is a schematic perspective view illustrating a pouch type secondary battery according to an exemplary embodiment of the present invention, including a battery unit 300, an electrode terminal 302, a pouch case 304, and an electrolyte injected into the pouch case. do.

The battery unit 300 includes a positive electrode plate and a negative electrode plate, and an insulating separator interposed between the positive electrode plate and the negative electrode plate, and is wound in a jelly-roll shape in a state where the positive electrode plate, the separator, and the negative electrode are arranged in this order. Or a stacking type. Here, the positive electrode plate and the negative electrode plate include a positive electrode current collector and a negative electrode current collector made of a metal thin plate, and a positive electrode and a negative electrode active material layer coated on at least one surface of the positive electrode and the negative electrode current collector. In the case of a lithium secondary battery, an aluminum thin plate is usually used as a positive electrode current collector, and a copper thin plate is used as a negative electrode current collector. As the positive electrode active material layer, a mixture containing a positive electrode active material such as a lithium oxide is used. As the negative electrode active material layer, a mixture containing a negative electrode active material such as a carbon material is used.

The electrode terminal 302 extends from the positive electrode plate and the negative electrode plate included in the battery unit 300. The electrode terminal 302 of the pouch secondary battery is made of nickel (Ni) or aluminum (Al).

The pouch case 304 having the space part 202 in which the battery part 300 is accommodated and the pouch cover 200 covering the space part 202 protrude in the direction in which the volume of the space part 202 increases. Has 204.

After the electrolyte is injected into the space 202, the flange 206 formed along the edge of the space 202 and the pouch cover 200 are joined to seal the space 202.

4 to 8 are schematic side views illustrating a pouch case according to various embodiments of the present invention.

In the embodiment of FIG. 4, the protrusion 404 is formed to be stepped from the space 402, and the protrusion 404 is formed at the center of the space 402.

In the embodiment of FIG. 5, the protrusion 504 is formed to be stepped from the space 502, and the protrusion 504 is formed on one side of the space 502. In the drawing, although the protrusion 504 is formed on the right side of the space 502, those skilled in the art will understand that it may be formed at one or more positions of front, rear, left and right.

6 is a modified example of the pouch case shown in FIG. 3, wherein the spaces 602a and 602b are formed on both sides of the case, and the protrusions 604a and 604b are formed of the spaces 602a and 602b. It is formed to protrude in the direction of increasing volume.

The embodiment of FIG. 7 is a modification of the pouch case shown in FIG. 4, wherein the spaces 702a and 702b are formed on both sides of the case, and the protrusions 704a and 704b of the space portions 702a and 702b. It is formed stepped in the center.

8 is a modified example of the pouch case shown in FIG. 5, wherein the spaces 802a and 802b are formed on both sides of the case, and the protrusions 804a and 804b are formed in the spaces 802a and 802b. It is formed to be stepped on one side. In the drawing, the protrusions 804a and 804b are formed on the right side of the spaces 802a and 802b, but those skilled in the art will appreciate that the protrusions 804a and 804b may be formed at one or more positions before, after, left and right.

As described above, according to the pouch case of the present invention and the pouch type secondary battery provided with the same, a protrusion is formed on the bottom surface of the pouch case, thereby securing an electrolyte impregnation space and securing a predetermined space in the finished product. It is effective in preventing warping.

Those skilled in the art will appreciate that the shape of the protrusion formed on the pouch case may be equivalent in shape deformation to secure the electrolyte impregnation space and prevent the warpage of the battery in addition to the shape illustrated in the embodiments and drawings of the present invention.

The present invention is not limited by the above described and illustrated in the drawings, of course, many more modifications and variations are possible within the scope of the claims set out below.

1A and 1B are schematic perspective views illustrating a conventional pouch case and a pouch type secondary battery having the same.

Figure 2 is a schematic perspective view showing a pouch case according to an embodiment of the present invention.

3 is a schematic perspective view illustrating a pouch type secondary battery according to an exemplary embodiment of the present invention.

4 to 8 are schematic side views illustrating a pouch case according to various embodiments of the present invention.

<Short description of drawing symbols>

Electrode assembly 102 electrode tab

110 ...... Pouch case 112 ...... Case body

114 ...... Case cover 116 ...... Case flange

118 ...... Flat Case Bottom 200, 400, 500 ...... Case Cover

202, 402, 502 ... space 204, 404, 504 ... protrusion

206, 406, 506 ... case flange 606, 706, 806 ... first flange

600, 700, 800 ... second flange 602a, 702a, 802a ... first space part

602b, 702b, 802b .. 2nd space part 604a, 704a, 804a ... 1st protrusion part.

604b, 704b, 804b ...... Second protrusion 300.

302 ...... electrode terminal 304 ...... pouch case

Claims (8)

A space part in which a battery part is accommodated; And Pouch case characterized in that it comprises a protrusion formed to protrude to the outside. The method of claim 1, wherein the protrusions, Pouch case characterized in that provided in the central portion of the space. The method of claim 1, wherein the protrusions, Pouch case, characterized in that formed on one side of the space. The method of claim 1, wherein the protrusions, Pouch case, characterized in that formed in step with the space. A battery unit having a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate; An electrode terminal extending from the positive electrode plate and the negative electrode plate; A pouch case having a space in which the battery unit is accommodated and a protrusion formed to protrude outward of the space; And A pouch type secondary battery comprising an electrolyte solution injected into a pouch case accommodating the battery unit. The method of claim 5, wherein the protrusion provided in the pouch case, A pouch type secondary battery, characterized in that provided in the central portion of the space. The method of claim 5, wherein the protrusions, A pouch type secondary battery, characterized in that formed on one side of the space portion. The method of claim 5, wherein the protrusions, Pouch-type secondary battery, characterized in that formed stepped with the space.