KR101588930B1 - Secondary battery - Google Patents

Abstract

A secondary battery according to the present invention includes: a unit stack having a first electrode, a first separator, a second electrode, and a second separator sequentially stacked to form a four-layer structure; And an electrode through hole is formed in the first electrode and the second electrode, a separation membrane through hole is formed in a position corresponding to the electrode through hole in the first separation membrane and the second separation membrane, The pouch exterior member is characterized in that a pouch through hole is formed at a position corresponding to the electrode through hole and the separation membrane through hole.

Description

Secondary Battery {SECONDARY BATTERY}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a secondary battery, and more particularly, to a secondary battery having a structure capable of increasing a degree of freedom in designing a device on which a secondary battery is mounted.

In general, the demand for secondary batteries is rapidly increasing due to the development of technology and demand for mobile devices. Of these, lithium (ion / polymer) secondary batteries, which have high energy density and high operating voltage and excellent storage and life characteristics, The devices are widely used as energy sources for various electronic products as well.

Korean Patent Laid-Open Publication No. 2008-0052869 discloses a structure of a general secondary battery, more specifically, a structure of a pouch-shaped secondary battery 10 that is symmetrical in a right and left and has a substantially rectangular parallelepiped shape (see FIG. 18 ).

Generally, such a rectangular parallelepiped secondary battery is advantageous in terms of space utilization of a device in which the secondary battery is installed. However, in some cases, the rectangular parallelepiped secondary battery may limit the space utilization of the device. For example, smart phones are designed to be ultra-thin for convenience of carrying, and often have a total thickness of less than 1 cm. However, since the secondary battery, various electronic components, and camera modules must be installed in an internal space of a limited smart phone, placement of components is very important. However, since the camera module is capable of zooming in and zooming out and has a plurality of lenses, it is very difficult to reduce the thickness. Also, since a large-capacity secondary battery is used for operating the smartphone for a long time, it is also very difficult to reduce the thickness of the secondary battery. Therefore, the camera module and the secondary battery are spaced apart from each other in the inner space of the smart phone, and are not overlapped with each other.

As described above, since there is a limit to the shape of the secondary battery, particularly in a small electronic device, the installation position of the component is limited to a specific position, and the size and design of the device are significantly restricted.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a secondary battery having a structure capable of increasing the degree of design freedom of a device on which the secondary battery is mounted.

A secondary battery according to the present invention includes: a unit stack having a first electrode, a first separator, a second electrode, and a second separator sequentially stacked to form a four-layer structure; And an electrode through hole is formed in the first electrode and the second electrode, a separation membrane through hole is formed in a position corresponding to the electrode through hole in the first separation membrane and the second separation membrane, The pouch exterior member is characterized in that a pouch through hole is formed at a position corresponding to the electrode through hole and the separation membrane through hole.

According to the present invention, it is possible to provide a secondary battery having a structure capable of increasing the degree of design freedom of a device on which the secondary battery is mounted.

1 is a plan view of a first electrode according to the present invention in which an electrode through hole is formed;
2 is a perspective view of a basic unit according to the present invention in which an electrode through-
3 is a plan view of a basic unit body according to the present invention in which an electrode through hole and a separation membrane through-
4 is a perspective view of a unit stack according to the present invention in which an electrode through hole and a separation membrane through-
Figure 5 is a cross-sectional view of a pinch and die for pouch exterior material molding
6 is a plan view of a pouch outer case according to the present invention in which a pouch-
7 is a flowchart showing a method of manufacturing a secondary battery according to the present invention
8 is a side view showing the first structure of the basic unit according to the present invention
9 is a side view showing a second structure of the basic unit according to the present invention
10 is a process diagram showing a process for producing a basic unit according to the present invention
11 is a side view showing a first structure of a unit stack portion including a basic unit body and a first auxiliary unit according to the present invention
12 is a side view showing a second structure of the unit stack portion including the basic unit body and the first auxiliary unit according to the present invention
13 is a side view showing a third structure of the unit stack portion including the basic unit and the second auxiliary unit according to the present invention
14 is a side view showing a fourth structure of the unit stack portion including the basic unit body and the second auxiliary unit according to the present invention
15 is a side view showing a fifth structure of the unit stack portion including the basic unit, the first auxiliary unit and the second auxiliary unit according to the present invention
16 is a side view showing a sixth structure of the unit stack portion including the basic unit body and the first auxiliary unit according to the present invention
17 is a side view showing a seventh structure of the unit stack portion including the basic unit body and the second auxiliary unit according to the present invention
18 is a conceptual diagram showing a conventional secondary battery structure

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the following examples.

A secondary battery according to the present invention includes a first unit electrode 111, a first separator 112, a second electrode 113, and a second separator 114 sequentially stacked to form a four-layer structure, A unit stack portion 100 in which at least one unit stack portion 100 is stacked; And a pouch exterior member 400 covering the unit stack portion 100. The first electrode 111 and the second electrode 113 are provided with an electrode through hole 210, A separation membrane through hole 220 is formed at a position corresponding to the electrode through hole 210 in the second separation membrane 124 and a through hole 210 corresponding to the electrode through hole 210 and the separation membrane through hole 220 is formed in the pouch exterior material 400 And a pouch through hole (430) is formed in a position.

At this time, the positioning rod 230 may be used to align the electrode through hole 210, the separation membrane through hole 220, and the pouch through hole 430. In addition, the size of the basic unit body 110 of the secondary battery may be a variable type secondary battery in which the size of the basic unit body 110 decreases or increases along the stacking direction of the basic unit.

The degree of freedom in designing the device on which the secondary battery is mounted can be increased through the shape and position change of the through hole 210, the separation membrane through hole 22, and the pouch through hole 430 formed in the secondary battery.

Referring to FIG. 1, an electrode through hole 210 is formed in the first electrode 111 and the second electrode 113 using the through-hole forming means 300. At this time, the through hole forming means 300 may be typically a laser. In order to align the electrode through holes 210 of the first electrode 111 and the second electrode 113 in the same manner, the first electrode 111 and the second electrode 113 are overlapped with each other, (Not shown).

The separation membrane through holes 220 are formed in the first separation membrane 112 and the second separation membrane 114 using the through-hole forming means 300. The separator through hole 220 is formed in a region corresponding to the position of the electrode through hole 210. In order to align the electrode through holes 210 and the separator through holes 220, a separator through hole 220 is formed in the separator while the electrode having the electrode through hole 210 is formed on the separator as shown in FIG. can do.

3, a first electrode 111, a first separation membrane 112, a second electrode 113, and a second separation membrane 114 are sequentially stacked to form a basic unit body 110 having a four-layer structure . The electrode and the separation membrane may be formed by adhering to each other. At this time, the positions of the electrodes to be bonded to the separation membrane can be aligned so that the electrode through-holes 210 and the separation membrane through-holes 220 are aligned. For example, the positioning rod 230 having the same shape and size as the electrode through hole 210 and the separation membrane through-hole 220 may be referred to as a first electrode 111, a first separation membrane 112, a second electrode 113 And the second separation membrane 114 to align the electrodes and the separation membrane.

Although the electrode through hole 210 and the separation membrane through hole 220 are shown in a rectangular shape in FIGS. 1 to 3, the present invention is not limited to this, and various shapes of circular or triangular shapes . The configuration of the electrode through hole 210 and the separation membrane through hole 220 makes it possible to increase the degree of freedom in designing the device on which the secondary battery is mounted.

Referring to FIG. 4, the unit stack 100 is formed by sequentially stacking at least one basic unit body 110 having an electrode through hole 210 and a through-hole 220 formed therein. The positioning rods 230 may be inserted into the electrode through holes 210 and the separation membrane through holes 220 of the basic unit body 110 to align the positions between the basic unit bodies. That is, the positioning rods 230 used in the alignment of the electrode through holes 210 and the separation membrane through holes 220 may be used in the basic unit alignment.

On the other hand, the secondary battery can be a variable type in which the size of the basic unit body 110 varies. For example, referring to FIG. 4, the size of the basic unit body 110 can be reduced uniformly along the stacking direction of the basic unit body. However, the size of the basic unit 110 may increase or decrease in size along the stacking direction. Such a variable secondary battery configuration is different from the conventional rectangular parallelepiped secondary battery configuration (see FIG. 18), and can be modified according to a design requirement of a device on which the secondary battery is mounted.

The pouch case 400 having the pouch penetration holes 430 is formed corresponding to the positions and sizes of the electrode penetration holes 210 and the separation membrane penetration holes 220. 5, a depression is formed at the center of the punch 410 to form a pouch through hole 430 in the pouch exterior material, and a protrusion is formed at a central portion of the die 420. As shown in FIG. However, the configuration may be reversed. In addition, the shape of the punch 410 and the die 420 may be formed stepwise as shown in FIG. 5 so that the shape of the pouch exterior member 400 corresponds to the shape of the secondary battery of the variable type.

6, the pouch-through hole 430 of the pouch exterior member 400 may have a shape of a rectangle (see FIG. 6A) or a circular shape (see FIG. 6B) have. 6 (c), the pouch cover member 430 may be formed as a groove (depression) on a part of the surface of the pouch skin member 400 (refer to FIG. 6 (c) The pouch hole 430 is formed in a part of the upper surface of the pouch hole 430, but it is not limited to this shape). The electrode through hole 210 and the separation membrane through hole 220 may be formed in the upper and lower and right and left portions of the basic unit body 110 before the pouch through- Plane.

The unit body stack portion 100 is covered with the pouch exterior member 400 to form a final secondary battery.

Referring to FIG. 7, a method of manufacturing a secondary battery according to the present invention includes: forming an electrode through hole 210 in a first electrode 111 and a second electrode 113; A separation membrane forming a separation membrane through hole 220 in the first separation membrane 112 and the second separation membrane 114 in a region corresponding to the electrode through hole 210 formed in the first electrode 111 and the second electrode 113, Through hole forming step S200; A basic unit forming step S300 of forming a basic unit body 110 having a four-layer structure by sequentially stacking the first electrode 111, the first separating film 112, the second electrode 113 and the second separating film 114 ); A basic unit stacking step (S400) of stacking the at least one basic unit body (110) in which the separation membrane through holes (220) are formed in order to form the unit stack unit (100); (S500) of forming a pouch exterior material (400) having a pouch through hole (430) corresponding to the position and size of the electrode through hole (210) and the separation membrane through hole (220); And a packaging step (S600) of covering the unit stack portion (100) with the pouch exterior material (400). Referring to the method of manufacturing a secondary battery according to the present invention, it is possible to understand the secondary battery according to the present invention.

The structure in which the unitary unit stacks 100 are formed by stacking the basic unit bodies 110 has been briefly described. Hereinafter, a concrete method of forming the basic unit body 110 and the unit body stack unit 100 according to the present invention will be described.

The unit stack (see reference numeral 100a in FIG. 11) includes at least one basic unit (refer to 110a and the like in FIG. 8). That is, the unit stack section 100 is formed of one basic unit body 110 or at least two basic unit bodies 110. The unit body stack unit 100 is formed by stacking the basic unit bodies 110. For example, the unit stack unit 100 may be formed by stacking one basic unit body 110 on one basic unit body 110. As described above, the unit stack unit 100 is formed by stacking the basic unit units 110 in units of basic units. That is, after the basic unit body 110 is formed in advance, the unit body stack unit 100 is formed by sequentially stacking the basic unit bodies 110.

As described above, the unit stack unit 100 according to the present embodiment is fundamentally characterized in that the basic unit bodies 110 are repeatedly stacked. When the unit stack unit 100 is formed in this manner, it is possible to align the base unit 110 with high accuracy and to improve the productivity.

The basic unit body 110 includes a first electrode 111, a first separator 112, a second electrode 113, and a second separator 114 sequentially stacked. Thus, the basic unit body 110 basically has a four-layer structure. 8, the first unit electrode 111, the first separation membrane 112, the second electrode 113, and the second separation membrane 114 are sequentially arranged from the upper side to the lower side Or the first electrode 111, the first separator 112, the second electrode 113, and the second separator 114 are sequentially stacked from the lower side to the upper side as shown in FIG. 9, . Here, the first electrode 111 and the second electrode 113 are opposite to each other. For example, if the first electrode 111 is a positive electrode, the second electrode 113 is a negative electrode. It may be the opposite of course.

The basic unit body 110 can be formed by the following process (see FIG. 10). First, a first electrode material 121, a first separation material 122, a second electrode material 123, and a second separation material 124 are prepared. Here, the electrode materials 121 and 123 are cut to a predetermined size to form electrodes 111 and 113, as described below. This is also true for the separation membrane materials 122 and 124. [ In order to automate the process, it is preferable that the electrode material and the separation membrane material have a form wound around a roll. After the materials are prepared as described above, the first electrode material 121 is cut to a predetermined size through the cutter C1. The second electrode material 123 is also cut through the cutter C2 to a predetermined size. Then, the first electrode material 121 of a predetermined size is supplied onto the first separation membrane material 122. The second electrode material 123 of a predetermined size is also supplied onto the second separation membrane material 124. Then, all of the materials are supplied together to the laminators L1 and L2.

As described above, the unit stack unit 100 is formed by repeatedly stacking the basic unit bodies 110. If the electrodes constituting the basic unit body 110 and the separator are separated from each other, it will be very difficult to repeatedly stack the basic unit bodies 110. Therefore, when the basic unit body 110 is formed, it is preferable to bond the electrodes and the separator to each other. The laminators L1 and L2 are used to bond the electrodes and the separator together. That is, the laminators L1 and L2 apply pressure to the materials, or apply heat and pressure to bond the electrode material and the separation membrane material to each other. Thus, the electrode material and the separation membrane material are adhered to each other in the laminators L1 and L2. By such adhesion, the basic unit body 110 can maintain its shape more stably.

Finally, the first separation membrane material 122 and the second separation membrane material 124 are cut together to a predetermined size through the cutter C3. The basic unit body 110 can be formed by such cutting. In addition, various tests may be performed on the basic unit body 110 as necessary. For example, a test such as thickness inspection, vision inspection, and short inspection may be additionally performed.

On the other hand, the separation membrane (separation membrane material) can be coated with a coating material having an adhesive force. The coating material may be a mixture of inorganic particles and a binder polymer. Herein, the inorganic particles can improve the thermal stability of the separator. That is, the inorganic particles can prevent the separator from shrinking at a high temperature. And the binder polymer can fix the inorganic particles. Due to such inorganic particles, a predetermined pore structure may be formed in the coating layer formed on the surface of the separation membrane. Due to the pore structure, ions can smoothly move from the anode to the cathode even though the inorganic particles are coated on the separator. In addition, the binder polymer can maintain the inorganic particles stably in the separation membrane, thereby improving the mechanical stability of the separation membrane. Furthermore, the binder polymer can stably adhere the separator to the electrode (such a coating is referred to as an SRS coating). For reference, the separator may be formed of a polyolefin-based separator substrate.

However, as shown in FIGS. 8 and 9, the electrodes 111 and 113 are located on both sides of the first separation membrane 112, while the electrodes 113 are located on only one side of the second separation membrane 114. Accordingly, the first separation membrane 112 can be coated with a coating material on both sides, and the second separation membrane 114 can be coated with a coating material on only one side. The first separator 112 may be coated with a coating material on both sides of the first and second electrodes 111 and 113 and the second separator 114 may be coated with a coating material on both sides of the first and second electrodes 111 and 113, The coating material may be coated on only one side of the viewing side.

As described above, the adhesion by the coating material is sufficient in the basic unit. Therefore, as described above, the second separation membrane 114 may be coated on only one side. However, since the base unit bodies can be adhered to each other by a heat press method or the like, the second separation membrane 114 can be coated on both sides as needed. That is, the second separator 114 may be coated with a coating material on one surface of the second electrode 113 facing the second electrode 113 and the opposite surface thereof. In this case, the base unit and the base units located immediately below the base unit may be adhered to each other through the coating material on the outer surface of the second separation membrane.

For reference, when a coating material having an adhesive force is applied to a separation membrane, it is not preferable to directly apply pressure to the separation membrane with a predetermined object. The separator typically extends longer toward the outside than the electrode. Therefore, there may be an attempt to bond the ends of the first separation membrane 112 and the ends of the second separation membrane 114 to each other. For example, there may be an attempt to melt the ends of the first separation membrane 112 and the second separation membrane 114 by ultrasonic welding. However, such ultrasonic welding requires pressing the object directly with a horn. However, when the end of the membrane is directly pressed by the horn, the horn can stick to the membrane due to the coating material having an adhesive force. This can lead to device failure. Therefore, when a coating material having an adhesive force is applied to a separation membrane, it is not preferable to apply a process of directly applying pressure to the separation membrane with a predetermined object.

In addition, the basic unit body 110 does not necessarily have a four-layer structure. For example, the basic unit body 110 includes a first electrode 111, a first separator 112, a second electrode 113, a second separator 114, a first electrode 111, a first separator 112 ), A second electrode 113, and a second separation layer 114 are sequentially formed on the first electrode layer 113 and the second electrode layer 114, respectively. That is, the basic unit body 110 may have a structure in which a four-layer structure is repeatedly formed. As described above, the unit body stack unit 100 is formed by repeatedly stacking the basic unit bodies 110. Therefore, the unit stack section 100 may be formed by repeatedly laminating the four-layer structure. However, the unit stack section 100 may be formed by repeatedly laminating eight-layer structures, for example.

The unit stack unit 100 may further include at least one of the first auxiliary unit 130 and the second auxiliary unit 140. First, the first auxiliary unit 130 will be described. The basic unit body 110 is formed by sequentially stacking the first electrode 111, the first separation membrane 112, the second electrode 113 and the second separation membrane 114 from the upper side to the lower side or from the lower side to the upper side . Therefore, when the unit stack 100 is formed by repeatedly stacking the basic unit bodies 110, the first electrode 100 may be provided at the uppermost position (see FIG. 8) or the lowest position (see FIG. 9) (Hereinafter, referred to as 'first terminal electrode'). (The first terminal electrode may be an anode or a cathode.) The first auxiliary unit body 130 is additionally stacked on the first terminal electrode 116.

11, when the first electrode 111 is an anode and the second electrode 113 is a cathode, the first auxiliary unit body 130a sequentially extends from the first terminal electrode 116, that is, The separator 114, the cathode 113, the separator 112 and the anode 111 may be sequentially stacked from the first terminal electrode 116 to the outside (upper side as viewed in FIG. 11). 12, if the first electrode 111 is a cathode and the second electrode 113 is a cathode, the first auxiliary unit body 130b is sequentially arranged from the first terminal electrode 116, that is, The separation membrane 114 and the anode 113 may be sequentially stacked from the terminal electrode 116 to the outside. The unit stack 100 may position the anode at the outermost side of the first terminal electrode 116 due to the first auxiliary unit body 130 as shown in FIG. 11 or FIG.

The electrode generally comprises a current collector and an active material layer (active material) applied on both sides of the current collector. 11, the active material layer located below the collector in the active material layer of the positive electrode reacts with the active material layer located above the collector in the active material layer of the negative electrode via the separation membrane. However, when the unit body stack unit 100 is formed by forming the basic unit bodies 110 in the same manner and then stacking them in order, the first end electrode positioned at the uppermost or bottommost position of the unit body stack unit 100 is electrically connected to the other first electrode It is inevitable to provide an active material layer on both sides of the current collector. However, if the first terminal electrode has a structure in which the active material layer is coated on both sides of the current collector, the active material layer located outside the active material layer of the first terminal electrode can not react with the other active material layer. Therefore, the active material layer is wasted.

The first auxiliary unit 130 is intended to solve such a problem. That is, the first auxiliary unit 130 is formed separately from the basic unit 110. Therefore, the first auxiliary unit 130 may include a positive electrode having an active material layer formed on only one side of the current collector. That is, the first auxiliary unit body 130 may include a positive electrode coated on the active material layer only on one surface (one surface facing downward with reference to FIG. 11) facing the basic unit body 110 on both surfaces of the current collector. As a result, when the unit element stack portion 100 is formed by further stacking the first auxiliary unit body 130 on the first terminal electrode 116, a positive electrode coated only on the outermost side of the first terminal electrode 116 . Therefore, the problem of wasting the active material layer can be solved. Since the anode has (for example) a structure of releasing nickel ions, it is advantageous in battery capacity to position the anode at the outermost position.

Next, the second auxiliary unit 140 will be described. The second auxiliary unit 140 basically performs the same function as the first auxiliary unit 130. This will be described more specifically. The basic unit body 110 is formed by sequentially stacking the first electrode 111, the first separation membrane 112, the second electrode 113 and the second separation membrane 114 from the upper side to the lower side or from the lower side to the upper side . 9) or at the bottom (see FIG. 8) of the unit stack 100, when the unit stack 100 is formed by repeatedly stacking the basic unit bodies 110, (Hereinafter, referred to as a 'second end separator'). The second auxiliary unit 140 is additionally stacked on the second end separator 117.

More specifically, as shown in FIG. 13, the second auxiliary unit 140a may be formed of a positive electrode 111 if the first electrode 111 is an anode and the second electrode 113 is a negative electrode. 14, when the first electrode 111 is a cathode and the second electrode 113 is a cathode, the second auxiliary unit 140b sequentially moves from the second terminal separation membrane 117, that is, The cathode 111, the separator 112, and the anode 113 may be sequentially stacked on the outer side (lower side in FIG. 14) from the terminal separator 117. Similarly to the first auxiliary unit body 130, the second auxiliary unit body 140 may be formed by coating the active material layer on only one surface (one surface facing the upper side as viewed in FIG. 14) that faces the basic unit body 110 on both sides of the current collector An anode may be provided. As a result, when the unit element stack portion 100 is formed by further laminating the second auxiliary unit body 140 on the second terminal separator 117, the anode coated only on the outermost side of the second terminal separator 117 is positioned .

11 and 12, and FIGS. 136 and 14 illustrate a case where the first electrode 111, the first separator 112, the second electrode 113, and the second separator 114 are sequentially arranged from the upper side to the lower side Are stacked. Conversely, the case where the first electrode 111, the first separator 112, the second electrode 113, and the second separator 114 are sequentially stacked from the lower side to the upper side can be similarly described . The first auxiliary unit body 130 and the second auxiliary unit body 140 may further include a separation membrane on the outermost side, if necessary. For example, when the anode located at the outermost side needs to be electrically insulated from the case, the first auxiliary unit 130 and the second auxiliary unit 140 may further include a separator on the outer side of the anode. For the same reason, as shown in FIG. 13, a separation membrane may be further included in the positive electrode exposed on the opposite side of the side where the second auxiliary unit body 140 is laminated (that is, the uppermost side of the unit body stack portion in FIG. 13).

On the other hand, as shown in Figs. 15 to 17, it is preferable to form the unit stack. First, the unit stack portion 100e can be formed as shown in Fig. The basic unit body 110b may include a first electrode 111, a first separator 112, a second electrode 113, and a second separator 114 stacked in this order from the lower side to the upper side. Here, the first electrode 111 may be an anode and the second electrode 113 may be a cathode. The first auxiliary unit 130c includes a separation membrane 114, a cathode 113, a separation membrane 112, and a cathode 111 sequentially from the first terminal electrode 116, that is, May be stacked. At this time, the anode 111 of the first auxiliary unit 130c may have an active material layer formed on only one side of the basic unit 110b.

The second auxiliary unit 140c includes a positive electrode 111, a first positive electrode 111, a separator 112, a negative electrode 113, a separator 113, (114) and an anode (118, second anode). At this time, the anode (118, the second anode) located at the outermost one of the anode of the second auxiliary unit 140c may be formed only on one side of the basic unit 110b. For reference, if the auxiliary unit includes a separation membrane, it is advantageous to align the unit.

Next, the unit stack portion 100f can be formed as shown in Fig. The basic unit body 110b may include a first electrode 111, a first separator 112, a second electrode 113, and a second separator 114 stacked in this order from the lower side to the upper side. Here, the first electrode 111 may be an anode and the second electrode 113 may be a cathode. The first auxiliary unit 130d may be formed by sequentially stacking a separation membrane 114, a cathode 113, and a separation membrane 112 from the first terminal electrode 116. At this time, the second auxiliary unit may not be provided. For reference, the cathode may react with the aluminum layer of the electrode case (e.g., pouch) due to the potential difference. Therefore, it is preferable that the cathode is insulated from the electrode case through the separator.

Finally, the unit stack portion 100g can be formed as shown in FIG. The basic unit 110c may include a first electrode 111, a first separator 112, a second electrode 113, and a second separator 114 stacked from the top to the bottom. In this case, the first electrode 111 may be a cathode and the second electrode 113 may be a cathode. The second auxiliary unit 140d may be formed by sequentially laminating the cathode 111, the separator 112, the anode 113, the separator 114 and the cathode 119 from the second terminal separator 117 in order have. At this time, the first auxiliary unit may not be provided.

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

100 (100a, 100b, 100c, 100d, 100e, 100f, 100g)
110 (110a, 110b, 110c): a base unit
111: first electrode 112: first separator
113: second electrode 114: second separator
116: first terminal electrode 117: second terminal membrane
121: first electrode material 122: first separation material
123: second electrode material 124: second separation membrane material
130 (130a, 130b, 130c, 130d): The first auxiliary unit body
140 (140a, 140b, 140c, 140d): The second auxiliary unit
210: Electrode penetration hole 220: Separation membrane penetration hole
230: positioning rod 300: through hole forming means
400: Pouch exterior material 410: Punch
420: die 430: pouch through hole

Claims (21)

A unit stack having a first electrode, a first separator, a second electrode, and a second separator sequentially stacked to form a four-layer structure; And
And a pouch exterior member covering the unit stack portion,
Within the basic unit,
The first electrode, the first separator, the second electrode, and the second separator are formed with through holes,
The first unit, the first electrode, the first separator, the second electrode, and the second separator are adhered to each other,
In the unit stack,
Wherein the plurality of basic unit bodies are aligned with respect to the separation membrane,
Wherein the pouch exterior member is formed with a pouch through hole at a position corresponding to the electrode through hole and the separation membrane through hole. delete The method according to claim 1,
Wherein the size of the basic unit is a variable type which decreases or increases along the stacking direction of the basic unit. The method according to claim 1,
And positioning rods are inserted into the electrode through holes and the separation membrane through-holes of the basic unit body to align the positions of the basic unit bodies. The method of claim 4,
Wherein the unit stack portion and the pouch exterior member are aligned by the positioning rods. The method according to claim 1,
The pouch-through hole is formed by a punch and a die,
And the punch and the die are configured to form the pouch through-hole. The method according to claim 1,
Wherein the electrode through hole and the separation membrane through hole are formed on a part of upper, lower, left and right sides of the basic unit body, and the pouch through hole is formed at a position corresponding to the electrode through-hole and the separation membrane through-hole of the basic unit body Lt; / RTI > delete The method according to claim 1,
Wherein the electrode and the separator are bonded to each other by applying pressure to the electrode and the separator or by applying pressure and heat to the electrode and the separator. The method according to claim 1,
Wherein the separation membrane is coated with a coating material having an adhesive force. The method of claim 10,
Wherein the coating material is a mixture of inorganic particles and a binder polymer. The method of claim 10,
Wherein the coating material is coated on both surfaces of the first separator facing the first electrode and the second electrode and the coating material is coated on only one surface of the second separator facing the second electrode, Secondary battery. The method of claim 10,
The coating material is coated on both surfaces of the first separator facing the first electrode and the second electrode, and the coating material is coated on one surface of the second separator facing the second electrode and the opposite surface thereof ,
Wherein the unit stack portion is formed by stacking two or more basic unit bodies, and the basic unit bodies are adhered to each other by the coating material of the second separation membrane. delete The method according to claim 1,
Further comprising a first auxiliary unit body for stacking a first auxiliary unit body on a first terminal electrode, which is a first electrode located at the uppermost or bottommost position of the unit body stack portion,
The first auxiliary unit body is formed by sequentially stacking a separation membrane, a cathode, a separation membrane and an anode from the first terminal electrode when the first electrode is an anode and the second electrode is a cathode, and the first electrode is a cathode Wherein the separator and the anode are sequentially stacked from the first terminal electrode when the second electrode is an anode. 16. The method of claim 15,
Wherein the positive electrode of the first auxiliary unit body comprises active material coated on both surfaces of the current collector and the current collector only on one side of the base unit facing the basic unit. The method according to claim 1,
Further comprising a first auxiliary unit body for stacking a first auxiliary unit body on a first terminal electrode, which is a first electrode located at the uppermost or bottommost position of the unit body stack portion,
Wherein the first auxiliary unit body is formed by sequentially stacking a separation membrane, a cathode, and a separation membrane from the first terminal electrode when the first electrode is an anode and the second electrode is a cathode. The method according to claim 1,
The unit stack may further include a second auxiliary unit stacked on the second separator, which is the second separator located at the uppermost or the lowest position,
The second auxiliary unit may be formed as an anode when the first electrode is an anode and the second electrode is a cathode, and sequentially from the second terminal separator when the first electrode is a cathode and the second electrode is an anode A negative electrode, a separator, and a positive electrode laminated on one another. 19. The method of claim 18,
Wherein the anode of the second auxiliary unit body is coated on both surfaces of the current collector and the current collector only on one surface of the base unit facing the primary unit body. The method according to claim 1,
And a second auxiliary unit for stacking a second auxiliary unit on a second separator, which is a second separator located at the uppermost or bottom of the unit stack,
The second auxiliary unit body is formed by sequentially stacking a first anode, a separator, a cathode, a separator and a second anode from the second terminal separator when the first electrode is an anode and the second electrode is a cathode,
Wherein the second anode of the second auxiliary unit body comprises an active material coated on only one surface of the current collector and the current collector facing the basic unit. The method according to claim 1,
And a second auxiliary unit for stacking a second auxiliary unit on a second separator, which is a second separator located at the uppermost or bottom of the unit stack,
Wherein the second auxiliary unit body is formed by sequentially stacking a cathode, a separator, a cathode, a separator, and a cathode from the second terminal separator when the first electrode is a cathode and the second electrode is an anode.

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