KR101340011B1 - Pouch type Lithium Secondary Battery - Google Patents

Abstract

The present invention relates to a pouch-type lithium secondary battery by forming a metal layer constituting the pouch packaging material with a lattice metal pattern layer, thereby enhancing its toughness against external force and improving moldability.

To this end, the present invention is an electrode assembly having a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, a receiving groove for accommodating the electrode assembly is formed therein, the insulating layer and the lattice shape on the insulating layer Formed metal pattern layer, a pouch packaging material consisting of an adhesive layer formed on the metal pattern layer, characterized in that it comprises an electrolyte accommodated in the receiving groove.

Therefore, the pouch-type lithium secondary battery according to the present invention can enhance its toughness against external force and improve moldability.

Pouch exterior material, lattice type, metal pattern layer, receiving groove, electrode assembly

Description

Pouch type lithium secondary battery {Pouch type Lithium Secondary Battery}

The present invention relates to a pouch-type lithium secondary battery, and more particularly, by forming a metal layer constituting the pouch case as a lattice-shaped metal pattern layer, the toughness to external force is enhanced, and the pouch-type lithium secondary improves moldability It relates to a battery.

Recently, with the development of electronic technology, miniaturization, light weight, and high energy density are strongly demanded as power sources for electronic devices such as mobile phones, camcorders, and notebook computers. In accordance with this trend, active batteries are being actively researched and developed, unlike primary batteries, which can be charged and discharged, and examples thereof include nickel-cadmium batteries, nickel-hydrogen batteries, and lithium secondary batteries.

Among them, lithium secondary battery is used as a power source for portable electronic devices, or used in a high-power hybrid vehicle by connecting several in series, which operates compared to nickel-cadmium batteries and nickel-hydrogen batteries. The voltage is three times higher and the energy density per unit weight is increasing rapidly.

Lithium secondary batteries are manufactured in various shapes, and typical shapes include cylindrical type, prismatic type, and pouch type. Recently, lithium polymer batteries have been in the spotlight, and have been manufactured in a pouch type having flexibility because there is no problem of leakage of electrolyte. In addition, the lithium polymer battery has excellent safety, and is lighter than a metal can, which is advantageous in slimming and reducing the weight of a portable electronic device using the same.

The pouch type lithium secondary battery according to the prior art has an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator interposed therebetween, and a groove in which the electrode assembly is accommodated. It includes a pouch case (pouch case) to provide.

When the pouch-type lithium secondary battery is described in more detail, the electrode assembly may be wound in a jelly roll type in a state of being disposed in the order of a positive electrode plate, a separator, and a negative electrode plate, or a plurality of positive electrode plates, separators, and negative electrode plates may be stacked. It can be formed by laminating (laminating). In addition, the positive electrode tab and the negative electrode tab are respectively drawn out from the positive electrode plate and the negative electrode plate, and the drawn ends thereof protrude to the outside through the sealing surface of the pouch sheathing material, and the protruding positive electrode tab and the negative electrode tab are provided on a protective circuit module. ; PCM) terminal.

The pouch sheathing material is different from the cylindrical or rectangular shape formed of a metal film of a thick film, in order to realize thin and short reduction of electronic devices, a metal layer of a thin film, an inner skin layer of resin material on both sides of the metal layer, and It is a composite film composed of an outer skin layer, and excellent in formability, and can be freely changed in shape. The pouch sheathing material forms a groove in which the electrode assembly can be accommodated by aligning the composite film configured as described above in a mold frame and pressing it at a predetermined pressure, and trimming along the edge. It will be produced in the desired shape. In this case, the pouch sheathing material maintains an approximately rectangular shape in order to optimize space efficiency when receiving the electrode assembly.

On the other hand, during the manufacture of the pouch packaging material through the above process, in particular, when pressing the composite film containing a plate-like metal layer without direction to form a receiving groove for receiving the electrode assembly is subjected to different loads for each drawing direction (drawing). At this time, there is a fear that a crack occurs at the site where the load is concentrated. In addition, after a crack occurs at a specific site, it can easily be transferred to another site nearby.

Therefore, the appearance and quality of the pouch exterior material are degraded due to cracks when forming the accommodating grooves of the pouch exterior material, resulting in a defect of the pouch-type lithium secondary battery.

The technical problem of the present invention to solve the above problems is to form a metal layer constituting the pouch packaging material of the lattice-shaped metal pattern layer, thereby providing a pouch-type lithium secondary battery with enhanced toughness to the external force, and improved moldability There is.

Pouch type lithium secondary battery according to the present invention for achieving the above technical problem is an electrode assembly having a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, the receiving groove for receiving the electrode assembly is formed inside And an insulating layer, a pouch sheath formed of a metal pattern layer formed in a lattice shape on the insulating layer, an adhesive layer formed on the metal pattern layer, and an electrolyte accommodated in the receiving groove.

The metal pattern layer may include a first metal pattern layer arranged in one direction, and a second metal pattern layer arranged in a direction crossing the first metal pattern layer on the first metal pattern layer. The first metal pattern layer and the second metal pattern layer may have a straight bar shape.

In addition, the first metal pattern layer and the second metal pattern layer may be formed in a curved shape.

The metal pattern layer may include a first metal pattern layer arranged in one direction and a second metal pattern layer woven up and down of the first metal pattern layer.

The metal pattern layer may further include a metal plate layer formed on at least one surface thereof.

The metal pattern layer is characterized in that formed of aluminum or aluminum alloy.

The electrode assembly may further include a positive electrode tab connected to the positive electrode plate and a negative electrode tab connected to the negative electrode plate, and the positive electrode tab and the negative electrode tab may extend to a outside of the pouch case and extend outwardly of the pouch case. A protective circuit board may be further connected to the positive electrode tab and the negative electrode tab.

On the other hand, the metal pattern layer may be composed of a plate-like metal plate layer, a third metal pattern layer arranged in one direction on the metal plate layer.

In the pouch-type lithium secondary battery according to the present invention, by forming a metal layer constituting the pouch case with a lattice metal pattern layer, the adhesion area between the inner and outer layers of the resin material and the intermediate metal pattern layer is increased, and the direct contact between the inner and outer layers is performed. Adhesion can be made to further enhance self toughness against external forces.

In addition, the load applied when forming the accommodating groove for accommodating the metal assembly inside the pouch case is distributed in all directions due to the directional metal pattern layer, so that the occurrence of cracks due to the concentration of loads at a specific site can be suppressed. Elongation is further improved to improve moldability, that is, to facilitate the implementation of the receiving groove depth.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

1 is a perspective view showing the state before the pouch packaging material is sealed in the pouch-type lithium secondary battery according to the first embodiment of the present invention, Figure 2 is a cross-sectional view of the pouch packaging material according to a first embodiment of the present invention, Figure 1 3 is a cross-sectional view taken along line AA of the present invention, FIG. 3 is a cross-sectional view taken along line BB of the pouch case according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional view of the pouch case according to the first embodiment of the present invention. The lattice-shaped metal pattern is shown, and is a cross-sectional view along the CC line of FIG.

Referring to FIG. 1, the pouch-type lithium secondary battery 100 according to the first embodiment of the present invention includes an electrode assembly 110 and a pouch packaging material 120 containing the electrode assembly 110.

The electrode assembly 110 is interposed between the positive electrode plate 111, the negative electrode plate 113, and the two electrode plates 111 and 113 to prevent short circuits between the two electrode plates 111 and 113 and to prevent lithium. It includes a separator 115 that serves as a passage for the movement of ions.

The electrode assembly 110 is formed by winding the positive electrode plate 111, the negative electrode plate 113, and the separator 115 in the form of a jelly roll.

On the other hand, although not shown, the positive electrode plate 111 includes a positive electrode current collector made of a thin aluminum foil (foil), and a positive electrode active material layer mainly composed of lithium-based oxide coated on both sides of the positive electrode current collector. In addition, a positive electrode non-coating portion, which is a region on which the positive electrode active material layer is not coated, is formed on both ends of the positive electrode current collector, and the positive electrode tab 111a is fixed to the positive electrode non-coating portion. The end of the positive electrode tab 111a is fixed to protrude above the upper end of the positive electrode current collector.

The negative electrode plate 113 includes a negative electrode current collector made of a thin copper foil and a negative electrode active material layer mainly composed of a carbon material coated on both surfaces of the negative electrode current collector. In addition, a negative electrode non-coating portion, which is an area on which the negative electrode active material layer is not coated, is formed on both ends of the negative electrode current collector, and the negative electrode tab 113a is formed on the negative electrode current collector. It is fixed, and the end of the negative electrode tab 113a is fixed to protrude above the upper end of the negative electrode current collector. Here, the positive electrode tab 111a and the negative electrode tab 113a may be formed of aluminum (Al), copper (Cu), nickel (Ni), etc. In general, the positive electrode tab 111a is formed of aluminum, and the negative electrode The tab 113a is made of nickel.

On the other hand, the positive electrode tab 111a and the negative electrode tab 113a are wound with an insulating tape 117 made of a material having excellent insulation and heat resistance to prevent a short circuit between the pouch case 120. In addition, the positive electrode tab 111a and the negative electrode tab 113a are drawn out through one side of the pouch packaging material 120 to protect the printed circuit board (PCB) and a plurality of electric elements formed thereon. It is electrically connected to a substrate PCM (not shown).

The pouch packaging material 120 includes a front plate 121 and a back plate 122 coupled to the front plate 121 by folding the middle of the pouch face member 120 based on the length direction of one side of a substantially rectangular film. In addition, the electrochemical of the positive electrode plate 111 and the negative electrode plate 113 during the charging and discharging of the electrode assembly 110 and the pouch-type lithium secondary battery 100 through a press process or the like inside the rear plate 122. An accommodating groove 123 may be formed in which an electrolyte (not shown) serving as a moving medium of lithium ions generated by the reaction may be accommodated, and an outer edge of the back plate 122 may be formed due to the formation of the accommodating groove 123. The portion 124 is formed naturally. The edge portion 124 is in direct contact with the front plate 121 when the pouch-type lithium secondary battery 100 is assembled, and the front plate 121 and the rear plate 122 are pressed through a heating or pressing process on the adhered area. They are fused and sealed together.

Hereinafter, the pouch packaging material of the pouch-type lithium secondary battery according to the first embodiment of the present invention will be described in more detail.

FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B of FIG. 1. 4 is a cross-sectional view taken along the line C-C of FIG. 2. Here, FIG. 2 is a cross-sectional structure of the front plate of the pouch packaging material, and FIG. 3 is a cross-sectional structure of the back plate of the pouch packaging material.

2 to 4, the laminated cross section of the pouch packaging material 120 includes an insulating layer 126, a metal pattern layer 127 formed in a lattice shape on the insulating layer 126, and a metal pattern layer 127. It consists of an adhesive layer 128 formed on it.

The insulating layer 126 forms an outer skin layer outside the pouch sheath 120 and comes into contact with the outside when the front plate 121 and the back plate 122 are sealed, and is insulated with an external conductive material. The insulating layer 126 may be formed of a resin material such as nylon or polyethylene terephthalate that has a high tensile force and is not easily punctured. In addition, the insulating layer 126 serves to smooth the molding process while protecting the metal pattern layer 127 and the adhesive layer 128 therein.

The metal pattern layer 127 may be formed of a first metal pattern layer 127a and a second metal pattern layer 127b.

The first metal pattern layer 127a and the second metal pattern layer 127b have a straight bar shape having a width, and the first metal pattern layer 127a is arranged in one direction, and the first metal pattern layer The second metal pattern layer 127b is arranged in the direction crossing the 127a. Here, the widths of the first metal pattern layer 127a and the second metal pattern layer 127b may be formed in various sizes.

Meanwhile, the region a defined by the first metal pattern layer 127a and the second metal pattern layer 127b intersects the first metal pattern layer 127a formed on one surface of the insulating layer 126. According to the angle at which the second metal pattern layer 127b to be arranged may be made in a rectangular shape, it may also be made in a rhombic shape. In addition, since the first metal pattern layer 127a and the second metal pattern layer 127b may be defined as regions having various shapes, the shape is not limited thereto. The first metal pattern layer 127a and the second metal pattern layer 127b may cross each other and may be formed in a lattice shape such as a network structure or a honeycomb structure, and the first metal pattern layer 127a and the second metal pattern layer may be formed. 127b may be applied by variously setting the arrangement and the crossing angle.

The metal pattern layer 127 may be formed of a metal material such as aluminum or an alloy including aluminum. Aluminum is a metal having excellent malleability and ductility, and excellent workability. For example, the metal pattern layer 127 ruptures in comparison to other metals in a bent portion such as a corner of the receiving groove 123 of the back plate 122 of the pouch packaging material 120. There is little concern. In addition, when the lattice-shaped metal pattern layer 127 is formed instead of a single plate, the adhesion area with the resin material such as the insulating layer 126 and the adhesive layer 128 is increased than the conventional single plate-shaped metal layer. As described above, a region defined by the intersection of the first metal pattern layer 127a and the second metal pattern layer 127b enables direct adhesion between the insulating layer 126 and the adhesive layer 128, thereby providing self-toughness against external force. This can be further enhanced.

The metal pattern layer 127 is preferably formed to have a thickness of 80 to 120㎛. The reason is that the metal pattern layer 127 constituting the pouch packaging material 120 is not limited to a specific thickness in the present invention, and in the general pouch type lithium secondary battery, the metal side of the pouch packaging material generally has a thickness of 80 to 120 μm. Because it is designed to have. However, the thickness of each of the first metal pattern layer 127a and the second metal pattern layer 127b constituting the metal pattern layer 127 is formed by dividing within the thickness range as described above, thereby forming the first metal pattern layer ( It is preferable that the sum of the thicknesses of 127a) and the second metal pattern layer 127b does not exceed the metal layer thickness range of the general pouch case as described above.

2 to 3, the adhesive layer 128 forms an inner skin layer inside the pouch sheath 120, and the electrode assembly accommodated in the pouch sheath 120 is sealed when the front plate 121 and the back plate 122 are sealed. 110). The adhesive layer 128 may be formed of a modified polypropylene (casted poly propylene) layer formed of a heat-adhesive resin such as polypropylene (polypropylene), polyethylene (polyethylene), etc., an inorganic material on the modified polypropylene layer Particles may be included to form a composite material of an organic material and an inorganic material.

The process of sealing the front plate 121 and the back plate 122 of the pouch packaging material 120 is the adhesive layer (128 of FIG. 2) and the pouch packaging material 120 of the pouch packaging material 120. 122, the adhesive layers (128 in FIG. 3) of the edge portion 124 are brought into close contact with each other, and these adhesive regions are fused by pressing and heating to form a single adhesive layer 128.

As described above, when the metal layer constituting the pouch case 120 for the pouch-type lithium secondary battery 100 is formed of the lattice metal pattern layer 127, the insulating layer 126 and the metal pattern layer 127 are formed. In addition, the adhesion area between the metal pattern layer 127 and the adhesive layer 128 is increased, and direct adhesion between the insulating layer 126 and the adhesive layer 128, which is a resin material, is possible, thereby further reinforcing its toughness against external force. In addition, the load applied when forming the accommodating groove 123 for accommodating the metal assembly 110 inside the pouch packaging material 120 is distributed in all directions due to the metal pattern layer 127 having a directionality, so as to concentrate the load of a specific portion. Due to the occurrence of cracks can be suppressed, the elongation is improved than the plate-like metal layer can improve the formability, that is, it is easier to implement the depth of the receiving groove 123 during deep drawing.

Next, a pouch-type lithium secondary battery according to a second embodiment of the present invention will be described.

5 is a plan view showing a metal pattern layer of the pouch packaging material according to the second embodiment of the present invention.

The pouch-type lithium secondary battery according to the second embodiment of the present invention differs from the pouch-type lithium secondary battery according to the first embodiment of the present invention only in the metal pattern layer of the pouch exterior material, and according to the first embodiment of the present invention. Since the pouch type lithium secondary battery has the same components, the same reference numerals are assigned to the same components, and duplicate descriptions thereof will be omitted. Accordingly, the second embodiment of the present invention will be mainly described with respect to the metal pattern of the pouch packaging material having a difference from the first embodiment of the present invention.

The pouch-type lithium secondary battery according to the second embodiment of the present invention includes an electrode assembly 110 and a pouch packaging material 220 containing the electrode assembly 110.

The pouch sheathing material 220 is folded to the front plate 121 and the front plate 121 by folding the middle of the substantially rectangular rectangular film formed integrally with respect to the length direction of one side thereof, and the electrode assembly 110 and the electrolyte (not shown). It is composed of a back plate 122 is formed a receiving groove 123 is received.

The pouch sheath 220 is formed of an insulating layer 126, an insulating layer 126, and a metal pattern layer 227 formed of a first metal pattern layer 227a and a second metal pattern layer 227b and a metal. It consists of an adhesive layer 128 formed on the pattern layer 227. Here, the metal pattern layer 227 is formed of the same material as the metal pattern layer 127 according to the first embodiment of the present invention, and plays the same role.

Referring to FIG. 5, the metal pattern layer 227 is arranged in one direction and is continuously curved in a direction crossing the first metal pattern layer 227a and the first metal pattern layer 227a and is continuously curved. The second metal pattern layer 227b is formed.

That is, the metal pattern layer 127 according to the first embodiment of the present invention is composed of the first metal pattern layer 127a and the second metal pattern layer 127b in the form of a straight bar, but according to the second embodiment of the present invention. In the metal pattern layer 227, the first metal pattern layer 227a and the second metal pattern layer 227b are formed in a continuous curved shape instead of a straight bar shape. This is compared with the first embodiment of the present invention, the metal pattern layer 227 according to the second embodiment of the present invention can improve the flexibility to the external force.

Next, a pouch type lithium secondary battery according to a third embodiment of the present invention will be described.

6 is a plan view showing a metal pattern layer of the pouch packaging material according to the third embodiment of the present invention.

The pouch-type lithium secondary battery according to the third embodiment of the present invention differs from the pouch-type lithium secondary battery according to the first embodiment of the present invention only in the metal pattern layer of the pouch exterior material, and according to the first embodiment of the present invention. Since the pouch type lithium secondary battery has the same components, the same reference numerals are assigned to the same components, and duplicate descriptions thereof will be omitted. Accordingly, the second embodiment of the present invention will be mainly described with respect to the metal pattern layer of the pouch case having a difference from the first embodiment of the present invention.

The pouch-type lithium secondary battery according to the third embodiment of the present invention includes an electrode assembly 110 and a pouch packaging material 320 accommodating the electrode assembly 110.

The pouch sheathing member 320 is folded with the front plate 121 and the front plate 121 by folding the middle of the pouch exterior material 320 in the longitudinal direction of one side of a substantially rectangular film formed integrally with the electrode assembly 110 and the electrolyte (not shown). When the receiving groove 123 is accommodated is formed of a back plate 122 is formed.

The pouch packaging material 320 is formed on the insulating layer 126 and the insulating layer 126, the metal pattern layer 327 consisting of the first metal pattern layer 327a and the second metal pattern layer 327b, and The adhesive layer 128 is formed on the metal pattern layer 327. Here, the metal pattern layer 327 is formed of the same material as the metal pattern 127 according to the first embodiment of the present invention, and plays the same role.

Referring to FIG. 6, the metal pattern layer 327 includes a first metal pattern layer 327a arranged in one direction and a second metal pattern layer 327b woven up and down of the first metal pattern layer 327a. Is done.

That is, the metal pattern layer 127 according to the first embodiment of the present invention is arranged in a direction in which the second metal pattern layer 127b intersects on the first metal pattern layer 127a arranged in one direction. The metal pattern layer 327 according to the third embodiment has a form of a textile in which the first metal pattern layer 327a and the second metal pattern layer 327b are woven together. Compared with the first embodiment of the present invention, since the metal pattern 327 according to the third embodiment of the present invention is configured in a more compact and stable arrangement, there is an advantage that it can further enhance its toughness against external force.

Next, a pouch-type lithium secondary battery according to a fourth embodiment of the present invention will be described.

7 is a partial cross-sectional view showing a laminated structure of the pouch packaging material according to the fourth embodiment of the present invention.

The pouch-type lithium secondary battery according to the fourth embodiment of the present invention is different from the pouch-type lithium secondary battery according to the first embodiment of the present invention except that a metal plate layer is added among the metal pattern layers of the pouch exterior material. Since the pouch-type lithium secondary battery according to the first embodiment of the present invention has the same components, the same reference numerals are assigned to the same components, and redundant descriptions thereof will be omitted. Accordingly, the fourth embodiment of the present invention will be mainly described with respect to the structure of the metal pattern layer of the pouch case having a difference from the first embodiment of the present invention.

The pouch-type lithium secondary battery 100 according to the fourth embodiment of the present invention includes an electrode assembly 110 and a pouch packaging material 420 accommodating the electrode assembly 110.

The pouch sheathing material 420 is folded with the front plate 121 and the front plate 121 by folding the middle of the pouch exterior member 420 in the longitudinal direction of one side of the substantially rectangular film formed integrally with the electrode assembly 110 and the electrolyte (not shown). It is composed of a back plate 122 is formed a receiving groove 123 is received.

Referring to FIG. 7, the pouch sheathing material 420 may be formed on the insulating layer 126, the first metal pattern layer 127a arranged in one direction on the insulating layer 126, and the first metal pattern layer 127a. On the metal pattern layer 127 composed of the second metal pattern layer 127b arranged in the crossing direction, the metal plate layer 427 formed on the metal pattern layer 127, and the metal plate layer 427. It is composed of the adhesive layer 128 formed. The metal plate layer 427 may be formed of the same material as the metal pattern layer 127.

As illustrated, the metal plate layer 427 may be formed between the second metal pattern 127b and the adhesive layer 128. In addition, the metal plate layer 427 may be formed between the insulating layer 126 and the first metal pattern layer 127a, and the metal plate layer 427 may include the second metal pattern layer 127b and the adhesive layer 128. It may be formed between, and at the same time may be formed between the insulating layer 126 and the first metal pattern layer 127a. In this case, the pouch sheathing material 420 may be divided into a plurality of metal pattern layers 127a to 127b and at least one metal plate layer 427, but as described above, the overall thickness is a general metal layer forming thickness range. It is preferable to form so as not to exceed.

That is, the metal pattern layer 127 according to the first embodiment of the present invention is arranged in a direction in which the second metal pattern layer 127b intersects on the first metal pattern layer 127a arranged in one direction. The metal pattern layer 127 according to the fourth embodiment has a form in which a plate-shaped metal plate layer 427 is added to the metal pattern layer 127 structure according to the first embodiment of the present invention. Compared with the first embodiment of the present invention, according to the fourth embodiment of the present invention, the strength of the metal pattern layer 127 may be further improved.

Next, a pouch-type lithium secondary battery according to a fifth embodiment of the present invention will be described.

8A is a plan view illustrating a metal pattern layer of the pouch case according to the fifth embodiment of the present invention, and FIG. 8B is a cross-sectional view illustrating a laminated structure of the pouch case according to the fifth embodiment of the present invention. The cross section is cut along the side.

The pouch-type lithium secondary battery according to the fifth embodiment of the present invention differs from the pouch-type lithium secondary battery according to the first embodiment of the present invention only in the structure of the metal pattern layer of the pouch exterior material, and according to the first embodiment of the present invention. Since the pouch-type lithium secondary battery according to the example has the same components, the same reference numerals are given to the same components and duplicated descriptions will be omitted. Accordingly, in the fifth embodiment of the present invention, the structure of the metal pattern layer of the pouch case having a difference from the first embodiment of the present invention will be described.

The pouch-type lithium secondary battery 100 according to the fifth embodiment of the present invention includes an electrode assembly 110 and a pouch packaging material 520 for accommodating the electrode assembly 110.

The pouch sheathing material 520 is folded with the front plate 121 and the front plate 121 by folding the middle of the pouch exterior material 520 based on the length direction of one side of the substantially rectangular film formed integrally with the electrode assembly 110 and the electrolyte (not shown). It is composed of a back plate 122 is formed a receiving groove 123 is received.

8A to 8B, the pouch sheathing material 520 may be in one direction on the insulating layer 126, the plate-shaped metal plate layer 527a formed on the insulating layer 126, and the metal plate layer 527a. The metal pattern layer 527 is constituted by the linear bar-shaped third metal pattern layer 527b and the adhesive layer 128 formed on the metal pattern layer 527. Here, the metal pattern layer 527 composed of the metal plate layer 527a and the third metal pattern layer 527b is formed of a metal material such as aluminum or an alloy including aluminum.

As illustrated, the metal plate layer 527a may be formed between the third metal pattern layer 527b and the insulating layer 126. In addition, the metal plate layer 527a may be formed between the adhesive layer 128 and the third metal pattern layer 527b. Meanwhile, the third metal pattern layer 527b arranged in one direction may be arranged in another direction. At this time, the metal pattern layer 527 of the pouch packaging material 520 is divided into a metal plate layer 527a and a third metal pattern layer 527b, but as described above, the overall metal pattern layer 527 The thickness is preferably formed so as not to exceed the general metal layer forming thickness range.

That is, the metal pattern layer 127 according to the first embodiment of the present invention is arranged in a direction in which the second metal pattern layer 127b intersects on the first metal pattern layer 127a arranged in one direction. In the metal pattern layer 527 according to the fifth embodiment of the present invention, a straight bar-shaped third metal pattern layer 527b is arranged in one direction on the plate-shaped metal plate layer 527a. This is compared with the first embodiment of the present invention, according to the fifth embodiment of the present invention, the strength of the metal pattern layer 527 itself can be further improved.

The present invention described above is not limited to the above-described embodiments and drawings, and it can be variously changed within the scope without departing from the technical idea of the present invention for those skilled in the art. Will be self explanatory.

1 is a perspective view showing a state before the pouch packaging material is sealed in the pouch-type lithium secondary battery according to the first embodiment of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along line B-B of FIG. 1 in a cross section of the pouch case according to the first embodiment of the present invention.

4 is a cross-sectional view illustrating a lattice metal pattern layer of a pouch case according to a first exemplary embodiment of the present invention, taken along line C-C of FIG. 2.

5 is a plan view showing a metal pattern layer of the pouch packaging material according to a second embodiment of the present invention.

6 is a plan view showing a metal pattern layer of the pouch packaging material according to a third embodiment of the present invention.

7 is a cross-sectional view showing a laminated structure of the pouch packaging material according to the fourth embodiment of the present invention.

8A is a plan view showing a metal pattern layer of the pouch packaging material according to the fifth embodiment of the present invention.

Figure 8b is a cross-sectional view showing a laminated structure of the pouch packaging material according to a fifth embodiment of the present invention, taken along the line D-D of Figure 8a.

<Explanation of symbols for the main parts of the drawings>

100; Secondary battery 110; Electrode assembly

111; Positive plate 111a; Anode Tab

113; Negative electrode plate 113a; Negative electrode tab

115; Separator 117; Insulation Tape

120, 220, 320, 420, 520 Pouch Exterior

121; Front panel 122; Backplane

123; Receiving groove 124; Edge

126; Insulating layer

127, 227, 327, 527 metal pattern layers 427, 527a; Metal plate layer

127a, 227a, 327a first metal pattern layer 127b, 227b, 327b second metal pattern layer

527b; Third metal pattern layer 128; Adhesive layer

Claims (11)

Electrode assembly having a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate A pouch packaging material having an accommodating groove for accommodating the electrode assembly and formed of an insulating layer, a metal pattern layer formed in a lattice shape on the insulating layer, and an adhesive layer formed on the metal pattern layer; Electrolyte housed in the receiving groove Pouch-type lithium secondary battery comprising a. The method of claim 1, The metal pattern layer is A first metal pattern layer arranged in one direction; A pouch type lithium secondary battery comprising a second metal pattern layer arranged on the first metal pattern layer in a direction crossing the first metal pattern layer. The method of claim 2, The first metal pattern layer and the second metal pattern layer is a pouch-type lithium secondary battery, characterized in that the straight bar (bar) shape. The method of claim 2, The first metal pattern layer and the second metal pattern layer are pouch type lithium secondary battery, characterized in that the curved shape. The method of claim 1, The metal pattern layer is A first metal pattern layer arranged in one direction; A pouch type lithium secondary battery comprising a second metal pattern layer woven up and down of the first metal pattern layer. The method of claim 1, The metal pattern layer further comprises a metal plate layer formed on at least one side. The method of claim 1, The metal pattern layer is a pouch type lithium secondary battery, characterized in that formed of aluminum or aluminum alloy. The method of claim 1, The electrode assembly is a positive electrode tab to the positive electrode plate, the negative electrode tab is further connected to the negative electrode plate, respectively, the positive electrode tab and the negative electrode tab is a pouch-type lithium secondary battery, characterized in that a predetermined length extending to the outside of the pouch packaging material. Electrode assembly having a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate An accommodating groove for accommodating the electrode assembly is formed therein, and a metal pattern layer including an insulating layer, a plate-shaped metal plate layer on the insulating layer, and a third metal pattern layer arranged in one direction on the metal plate layer. Pouch packaging material consisting of an adhesive layer formed on the metal pattern layer and Electrolyte housed in the receiving groove Pouch-type lithium secondary battery comprising a. The method of claim 9, The third metal pattern layer is a pouch type lithium secondary battery, characterized in that the straight bar shape. The method of claim 9, The metal pattern layer is a pouch type lithium secondary battery, characterized in that formed of aluminum or aluminum alloy.

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