KR101516449B1 - Middle or large sized battery pack and packaging method thereof - Google Patents

Abstract

The present invention relates to a middle- or large-sized battery pack with improved safety and space utilization, and a method of packaging the battery pack. The battery pack is first packaged using a pouch-type packaging material, The upper and lower surfaces of the battery pack are packaged with a material that can be assembled into a pack, thereby improving the safety and space utilization of the pouch type packaging material and the metal packaging material.
The packaging method of the present invention is a middle- or large-sized battery pack in which the packaging process of a battery is easily improved, space utilization is maximized, light and compact, each cell is firmly fixed inside and safety is further improved, and a packaging method of a middle- or large- to provide.

Description

[0001] The present invention relates to a middle- or large-sized battery pack and a packaging method thereof,

The present invention relates to a middle- or large-sized battery pack with improved safety and space utilization, and a packaging method thereof. More particularly, the present invention relates to a middle- or large-sized battery pack and a method of packaging the same. More particularly, the present invention relates to a battery pack having a plurality of cells packaged with the pouch- The present invention relates to a middle- or large-sized battery pack having improved safety and space utilization, and a method for packaging the middle- or large-sized battery pack, wherein the cells are secondarily packaged with a metal tube or a plastic tube and a material capable of assembling the battery pack.

In recent years, lithium secondary batteries, which can be charged and discharged, have been widely used as energy sources for wireless mobile devices. In addition, it is attracting attention as a power source for electric vehicles and hybrid electric vehicles (HEV), which are proposed as measures to solve air pollution of existing gasoline vehicles and diesel vehicles that used fossil fuels.

Medium and large-sized devices such as automobiles are required to have high power and large capacity, middle- or large-sized battery systems in which a plurality of battery cells are electrically connected are used, and as the output or energy density is gradually increased, the number of unit modules Will gradually increase. The pouch-type lithium ion polymer secondary battery, which is often used as a unit cell in such a middle- or large-sized battery system, has a relatively large size as compared with the same-type battery used in a small-sized device.

In addition, when designing a pack of a middle- or large-sized lithium secondary battery used as a power source for an electric vehicle, a plug-in, and a hybrid automobile, not only a high output like a conventional battery is required but also high energy is required. Of the battery should be high capacity and high power. In order to accomplish this, a large-capacity battery must be mounted in a limited space, so that the number of cells is increased or a large number of unit cells are packaged in a single lithium rechargeable battery. This increases the number of unit cells gradually included in one battery The size of the cell becomes very large. In this case, the packaging process becomes complicated, and the thickness of the packaging increases. As a result, there arises a problem that the difficulty in the manufacturing process and the reduction of the performance, and the problem of the packaging effect which requires the use of the effective space are lowered.

Therefore, there is a growing need for a simple yet efficient method of packaging a rechargeable lithium battery in a packaging method for making such a large-capacity cell and a battery having a large number of unit cells.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a battery pack for a battery pack, which can easily package a plurality of battery cells and unit modules, Sized battery pack and a method for packaging the same, which maximize the utilization of the internal space at the time of assembling the pack and have improved safety.

In order to solve the above problems, the present invention provides the following solutions.

That is, the present invention provides a method of packaging a lithium secondary battery pack,

A first step of firstly packaging a battery cell including an electrode assembly and an electrolyte;

A second step of secondary packaging the body part of the unit module in which the plurality of primary cells are laminated;

Packaging the top and bottom surfaces of the unit module; And

And arranging the unit modules according to the three steps in a module case.

The packaging material for the first-stage packaging in the first stage is characterized by packaging using a pouch-type packaging material made only of a thermoplastic resin which is not dissolved in the electrolyte solution.

The thermoplastic resin which is not soluble in the electrolytic solution may be any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), and PET (polyethylene terephthalate) .

The packaging material for the first-stage packaging in the first step is a pouch-type packaging material which is formed of a thermoplastic resin having a metal laminate layer embedded therein and the outside of the metal laminate layer is not dissolved in an electrolyte solution.

Further, the metal laminate layer is an aluminum metal laminate layer.

Wherein the secondary packaging in the second step is characterized by packaging in the form of a plastic tube or a metal tube having both end faces corresponding to the upper end face and the lower end face,

Wherein the plastic tube is made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride)

The metal tube may be made of any one selected from the group consisting of aluminum, iron, nickel, copper, and alloys thereof.

In the meantime, a notch is formed in the metal pipe or the plastic pipe.

The packaging material for packaging the upper surface or the lower surface of the unit module according to the above three steps is a protection circuit or a PTC circuit.

The area of the protection circuit or the PTC is equal to the size of the cross section of the plastic pipe or the metal pipe, Characterized in that,

In the fourth step, the unit modules are vertically arranged so that the protection circuit or the PTC circuit attached to the upper surface or the lower surface of the unit module contacts the bottom surface of the module case. In this case, the unit module is characterized in that the electrode leads are positioned in the same direction.

In the fourth step, the unit modules are horizontally arranged so that one surface of the unit module, except the surfaces on which the electrode leads of the unit modules are positioned, is in contact with the bottom surface of the module case. And the electrode leads are positioned in mutually opposite directions.

The present invention also relates to a battery cell packaged with a primary packaging material including an electrode assembly and an electrolyte;

The battery cell is stacked and the body portion is packaged with the secondary packaging material. The surface opposite to the surface on which the electrode tab is located is packaged by a protection circuit or a PTC circuit. The surface on which the electrode tab is located is packed with a unit module ; And

A module case including a plurality of unit modules;

And a battery pack.

Wherein the primary packaging material is a pouch-type packaging material made only of a thermoplastic resin that is not soluble in an electrolytic solution,

The thermoplastic resin which is not soluble in the electrolytic solution may be any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), and PET (polyethylene terephthalate) .

The primary packaging material is a pouch-type packaging material having a metal laminate layer embedded therein and a thermoplastic resin which is not dissolved in the electrolyte solution outside the metal laminate layer.

Wherein the metal laminate layer is an aluminum metal laminate layer.

The secondary packaging material is characterized by being a plastic pipe or a metal pipe having openings at both end surfaces corresponding to the upper end surface and the lower end surface,

Wherein the plastic tube is made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), acrylic resin, , Copper, or an alloy thereof.

In the meantime, a notch is formed in the metal pipe or the plastic pipe.

The area of the protection circuit or the PTC is equal to the size of the cross section of the plastic pipe or the metal pipe, or is in the range of 0.2 mm to 2 cm .

Wherein the unit modules are arranged vertically so that the protection circuit or the PTC circuit attached to the upper end surface or the lower end surface of the unit module contacts the bottom surface of the module case. In this case, And the electrode leads are positioned in the same direction.

The battery pack may further include unit modules arranged horizontally such that one side of the unit pack is in contact with the bottom surface of the module case except for the side where the electrode leads of the unit module are located, The module is characterized in that the electrode leads are positioned in mutually opposite directions.

The battery pack may include a power tool; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), and a plug-in hybrid electric vehicle (PHEV); Electric motorcycle including E-bike, E-scooter; Electric golf cart; Electric truck; And is used as a power source of an electric commercial vehicle.

The middle- or large-sized battery pack packaging method according to the present invention can simplify the packaging step of a middle- or large-sized battery pack used as a power source for a hybrid electric vehicle or the like, while maintaining the advantages of existing packaging materials, to provide.

In addition, in the middle- or large-sized battery pack in which the unit cells and the unit modules are more firmly fixed inside the battery pack while being light and compact by maximizing the space utilization in assembling the pack, and are frequently exposed to frequent vibration or strong shock, An improved battery pack and a manufacturing method thereof are provided.

1 is a perspective view schematically showing a battery cell for packaging an electrode assembly and an electrolyte solution as a primary packaging material.
2A and 2B are perspective views of a unit module in which a plurality of battery cells are stacked and a body portion is packaged in a secondary packaging material, as viewed from an upper surface and a lower surface.
3A and 3B are perspective views of a unit module in which a body part is packaged with a secondary packaging material formed with a notch, as viewed from an upper end face and a lower end face.
4 is a perspective view illustrating a step of packaging a lower end of a unit module in which a body part is packaged with a secondary packaging material.
FIG. 5 is a perspective view of a unit module having a body part and a bottom surface packaged as viewed from the lower end.
6A to 6C are perspective views illustrating a step of packaging the upper surface of the unit module according to connection forms of a plurality of battery cell taps.
FIGS. 7A to 7C are perspective views of a unit module in which packaging is completed according to a connection form of a plurality of battery cell taps. FIG.
8A to 8C are perspective views schematically showing a state in which a packaged unit module is arranged in a module case according to a connection form of a plurality of battery cell taps.

According to an aspect of the present invention, there is provided a method of packaging a middle- or large-

A first step of firstly packaging a battery cell including an electrode assembly and an electrolyte;

A plurality of the firstly packaged battery cells are stacked or connected in parallel Or serial connection to form a unit module and secondly packaging only the body part except for the upper and lower ends;

A third step of packaging upper and lower ends of the second packaged unit module; And fixing the packaged unit modules with the upper and lower ends to the module case and assembling the packs.

An object of the present invention is also to provide

A battery cell packaged with a primary packaging material including an electrode assembly and an electrolyte;

A unit module in which the battery cells are stacked, a body portion is packaged in a secondary packaging material, and the top and bottom surfaces are packaged; And

A module case including a plurality of unit modules connected thereto; And a middle or large-sized battery pack.

Hereinafter, a method of packaging a battery pack of the present invention will be described with reference to the drawings, and a structure of the present invention will be described.

Fig. 1 is a perspective view schematically showing a battery cell 13 in which an electrode assembly 11 and an electrolyte solution are packaged with a primary packaging material 20. Fig.

In the first step, the electrode assembly 11 and the battery cell 13 including the electrolyte are firstly packaged using the pouch-type packaging material 20 or the like as a first step.

The pouch-type packaging material 20 for the primary packaging is satisfactory if it is made of a thermoplastic resin that does not dissolve in the electrolytic solution. For example, PE (polyethylene), PP (polypropylene), PS (polystyrene) , nylon (polyamide), and PET (polyethylene terephthalate).

In addition, the pouch-type packaging material 20 may be a pouch-type packaging material in which a metal laminate layer such as an aluminum laminate is further embedded in addition to the thermoplastic resin.

The pouch-type packaging material for the primary packaging may be a pouch-type packaging material in which the metal laminate layer is further embedded, or a pouch-type packaging material made of the thermoplastic resin alone, depending on the material of the secondary packaging material described below. That is, if the secondary packaging material for the second-stage packaging is a material capable of permeating moisture and electrolytic solution, the primary packaging material, that is, the pouch-type packaging material, is preferably packaged using the pouch-

In the case of the pouch-type packaging material in which the metal laminate layer is further embedded, the outside of the metal laminate is coated with the thermoplastic resin, Do not infiltrate.

In the present invention, the electrode assembly 11 housed in the primary packaging material 20 can have various structures such as a stacked (stacked) structure and a jelly-roll (wrapping) structure.

In general, the secondary battery is classified into a lithium ion battery, a lithium ion polymer battery, a lithium polymer battery, or the like depending on the structure of the electrode assembly, the configuration of the electrolyte, and the like. And a lithium ion polymer battery having a simple cell assembly process can be preferably used in the present invention.

One end of the electrode lead 12 is positioned inside the pouch-type packing material with the electrode tabs of the electrode assembly attached, and the opposite end is exposed to the outside of the pouch-type packing material. Of the electrode leads, the positive electrode lead is not particularly limited and a metal foil made of aluminum which can be generally used can be used, and a negative electrode lead can also be used, such as a metal foil made of generally used copper. The electrode tabs may be bonded to the electrode leads by a commonly used method such as spot welding, and the thickness of the electrode leads is preferably about 200 to 500 μm.

The lithium secondary battery of the present invention is characterized in that the electrode assembly 11 of a positive electrode / separator / negative electrode in which an electrolyte is impregnated in the pouch type packaging material 20 is placed, and a high temperature and a high pressure are applied to the bonding portion of the pouch type packaging material Seal it.

As described above, the primary packaging of the battery cells is packaged by using a thermoplastic resin or the like, and when the gas is generated in the cell due to the use of the battery and a safety accident, the polymer pouch- So that the risk of the generation of gas during use can be prevented. The battery cell is firstly packaged with the flexible pouch-type packaging material first, and the leakage of the electrolyte solution and the contact between the battery cell and the metal packing material And to prevent the insulation phenomenon caused by the insulation.

In addition, depending on the material of the secondary packaging material, one of the polymer pouch-type packaging material or the polymer-only pouch-type packaging material containing the metal laminate layer may be selected and packaged to improve the safety of the battery and to provide a compact, hard and light lithium secondary battery .

The thickness of the pouch-type packaging material 20 is not particularly limited, but is preferably 150 to 200 μm in consideration of durability, space utilization, weight of the battery, and the like.

According to the packaging method of the present invention, a plurality of firstly packaged battery cells are stacked in order by the pouch-type packaging material, and the unit modules in which the firstly packaged battery cells are stacked, Lt; / RTI >

2A and 2B are perspective views illustrating a state in which only the body portion 22 of the unit module is secondarily packaged.

In the unit module in which the plurality of battery cells are stacked, a surface on which the electrode leads 12 protrude is referred to as a top surface 24, a surface opposite to the top surface 24 is referred to as a bottom surface 26, And a portion made up of other surfaces except the surface 26 is referred to as a body portion 22. [

In the second step of the lithium secondary battery packaging method of the present invention, only the body part 22 of the unit module is first packaged. For this purpose, the unit module in which the battery cells are stacked is directly inserted using a secondary packaging material composed of a plastic pipe or a metal tube 30 having both end faces corresponding to the upper end face 24 and the lower end face 26 opened .

That is, only the body part of the unit module made up of the firstly packed battery cells is secondarily packaged with the metal tube 30 or the plastic tube, so that the outside of the first packaged pouch- ) Or a plastic tube.

By securing the outside of the unit module firmly by secondary packaging using the packaging material having a higher strength as described above, the swelling phenomenon of the pouch-type packaging material 20 is suppressed and the outside of the battery is tightly packaged, The battery is protected from impact and the unit cell or the unit module can be structurally and securely fixed to the inside.

Since the upper surface 24 and the lower surface 26 are subjected to secondary packaging using an open metal tube 30 or a plastic tube, the unit module can be inserted as it is, .

The metal tube 30 for the secondary packaging may be made of any one selected from the group consisting of aluminum, tin, chromium, iron, nickel, copper and alloys thereof. The plastic tube may be PE (polyethylene) Propylene), PS (polystyrene), PVC (vinyl chloride), acrylic resin, and the like. However, a metal tube made of aluminum is preferably used. This is because the pouch-shaped packaging material has a strength that can most effectively prevent swelling of the pouch-shaped packaging material but is light in weight. FIGS. 2A and 2B show an embodiment of the present invention in which the secondary packaging material is used as the metal tube 30. FIG.

When the metal pipe 30 such as aluminum is used as the secondary packaging material as described above, it is preferable that the primary packaging material is a pouch-type packaging material not containing the metal laminate. In this case, it is possible to prevent the protrusion of the metal laminate layer, which may be generated by cutting the sealing edge of the pouch-type packaging material after the first packaging, and the insulating phenomenon of the battery due to the protrusion, but also the strength of the casing is high and the swelling phenomenon is effectively suppressed Which can provide lithium secondary batteries.

The thickness of the metal tube 30 or the plastic tube is not particularly limited, but it is within a range of 250 to 2 mm considering the utilization of the internal space of the battery and the weight of the whole battery.

In the case of a small prismatic battery, a can type packing material having a thickness of about 200 to 250 μm is generally used. However, it is difficult to suppress the swelling phenomenon of the battery. It is preferable that the maximum thickness is less than 2 mm in consideration of heat transfer inside the battery.

2A and 2B, the shape of the metal tube 30 is illustrated as a quadrangle. However, the present invention is not limited thereto, and the shape of the metal tube or the plastic tube may be various shapes such as a square shape or a circular shape.

On the other hand, a fine V-shaped or dotted notch is provided on the outside of the secondary packaging material such as the metal pipe or the plastic pipe for secondary packaging of the body part so that venting of the internal gas can be easily performed. .

By using the secondary packaging material including the notch on the outside as described above, the gas generated inside can be vented more easily. As a result, the high strength of the double packaging and the secondary packaging material can eliminate the risk of increasing the pressure inside the cell or causing an event such as a temperature rise.

That is, when the gas generated inside the battery reaches a certain pressure, the portion where the notch is formed is easily ruptured while being blown out, so that the discharge of the internal gas can be led to the side where the notch is formed. Accordingly, the pressure, the discharge direction of the exhaust gas can be effectively controlled by using the number, shape, and position of the notches.

3A and 3B show an embodiment of the present invention in which a V-shaped notch 28 introduces a secondary packaging material formed in a body portion of a unit module. However, it should be understood that the present invention is not limited thereto, and the shape, position, and number of the notches may be varied depending on the pressure and direction of the desired exhaust gas.

In the case of using the secondary packaging material having the notches as described above, it is possible to use a secondary packaging material having both the upper and lower end faces as described above, May be used.

On the other hand, after the body part 22 of the unit module is secondarily packaged, the open upper end surface 24 and the lower end surface 26 are packaged. FIGS. 4 to 7C illustrate a method of packaging the upper end surface 24 and the lower end surface 26 of the unit module. FIGS. 6A to 6C and FIGS. 7A to 7C illustrate a method of packaging the upper end surface And a plurality of electrode tabs protruding from the electrode tabs.

4, the bottom surface 26 of the unit module is covered with a protection circuit 40 or a PTC circuit included in the packaging of the lithium secondary battery, To seal with a metal pipe or a plastic pipe.

The area of the protection circuit 40 or the PTC circuit used is designed to be equal to or larger than the area of the top surface 24 or the bottom surface 26 by 0.2 mm to 2 cm. This is because the bottom surface 26 packaged with the protection circuit 40 or the PTC circuit is fixed to the bottom of the module case when the unit modules having both ends of the both ends are completely arranged in the module case in series, So that the unit modules can be more securely and firmly fixed in the module case. Therefore, as the area of the protection circuit 40 or the PTC circuit attached to the bottom surface 26 is wider, the assembled cells can be more stably fixed and thus safe. 5 is a perspective view illustrating a state in which the lower end surface 26 of the unit module is sealed with the protection circuit 40 having a larger area.

As a result, it is possible to provide a more secure middle-sized lithium-ion secondary battery in the case of an automotive middle- or large-sized battery having many impacts and fluctuations.

The adhesive for sealing the protection circuit 40 or the PTC circuit and the metal pipe 30 or the plastic pipe is not particularly limited and may be sealed using an acrylic resin, polyethylene, polyester resin, or the like, It is also possible to melt and seal.

In addition, the lower sealing portion of the secondary packaging material of the unit module, that is, the portion where the protection circuit or the PTC circuit is adhered to the metal pipe or the plastic pipe can be easily vented than other portions of the secondary packaging material It can be a passage through which the internal gas can be discharged to the outside. That is, the secondary packaging materials of the body portion, the upper surface, and the lower surface of the unit module are packaging materials made of a material having a high strength that does not easily swell and gas is difficult to be vented. In addition, the body part where the internal gas is generated is guided so that the metal tube or the plastic tube with high strength is firmly caught, so that the gas generated inside is more The effect of applying pressure to be discharged to the outside and the effect of inducing gas to be vented toward the lower sealing portion are provided. Such an effect can reduce the risk of explosion of the unit module due to the generation of gas in the battery cell, thereby providing a battery pack with improved safety.

6A and 6B, the upper end surface 24 of the unit module is connected to one of the positive electrode leads 12a and the negative electrode lead 12b by connecting the respective electrode tabs protruded from the respective battery cells. So as to protrude. In the case where the tabs are connected to form one electrode lead and the top surface is packaged, the packaging process may be simplified. However, in the case of a unit module including a plurality of battery cells, The amount of current to be applied to the lead and the negative electrode leads may be excessive. Preferably, the unit module may be formed such that a plurality of electrode leads protrude as in the other embodiment shown in FIG. 6C. 6A to 6C illustrate one embodiment of the present invention, and the present invention is not limited thereto. In consideration of the capacity of the unit module and the simplification of the packaging process, etc., Of course, you can.

Thereafter, the electrode leads 12a and 12b are sealed with a cap 42 designed to be fixed out of the cell. The cap 42 is made of the same material as that of the top surface 24 and is not particularly limited as far as its material is used. It is satisfactory to use a known assembly cap for battery packaging or the like, And an assembly cap including an opening.

On the other hand, when using a conventional rectangular type secondary packaging material formed with a notch, separate packaging at the lower end is not required, but the above method is followed for packaging of the upper end where the electrode leads are located.

7A to 7C are perspective views schematically showing the shape of a unit module having completed the packaging step of the second and third steps according to the lithium secondary battery packaging method of the present invention, FIG.

The unit module in which the packaging of the body part 22 and the upper end surface 24 and the lower end surface 26 is completed is arranged in series in the module case.

8A to 8C are schematic perspective views of a configuration in which first and second packaged unit modules are arranged in series in a module case 50 according to an embodiment of the present invention. 8A to 8C show one embodiment of the arrangement of the unit modules, and the unit modules according to the present invention can be stacked or arranged in the module case in various forms, and in the embodiment, Although four unit modules are arranged in the module case 50, the present invention is not limited thereto, and the unit modules accommodated in the module case may also be configured to accommodate two, three, or more than two.

The protection circuit 40 or the PTC circuit attached to the lower end surface 26 of the unit module may be attached to the bottom surface of the module case 50 such that the protection circuit 40 or the PTC circuit is positioned downward, The modules are arranged in series to firmly fix the protection circuit or the like to the bottom of the module case 50.

By packaging the lower end surface 26 of the unit module using the protection circuit 40 or the PTC circuit or the like as described above, it is possible to prevent the protection circuit 40 or the PTC from being damaged, And the unit modules can be firmly fixed to the module case 50 without using a separate failure device. This provides a lightweight, compact and safe mid- to large-sized lithium secondary battery.

On the other hand, in the case where the electrode leads of the unit module by the secondary packaging are not all located on the upper surface but located in different directions, one of the both end surfaces on which the electrode lead is located is protected by a protection circuit or a PTC circuit The membrane is then sealed with a metal or plastic tube and adhesive. At this time, the adhesive used in the bonding is the same as the adhesive and the bonding method described above.

In such a case, the area of the protection circuit or the PTC circuit used for the packaging of the upper end surface or the lower end surface is designed to be 0.2 mm to 2 cm larger than the area of the upper or lower end of the metal pipe or the plastic pipe, The unit module is packaged.

The opposite side of the surface sealed with the protection circuit or the PTC circuit is formed by using a cap formed so that the electrode lead protrudes Packaging.

As described above, the packaged unit modules on both ends are also arranged in series in the module case. At this time, the packaged unit cells or the unit modules are arranged such that one side of the packaged unit cell or the unit module, which is narrower than the two faces on which the electrode leads are located, is in contact with the bottom of the module case. At this time, the protection circuit or the PTC circuit attached to either one of the left and right sides of the unit module arranged in the module case can be stably attached so as to come in contact with the side surface of the module case, .

The middle- or large-sized battery manufactured according to the packaging method of the present invention can be manufactured by combining a plurality of battery cells or unit modules according to a desired output and capacity. In consideration of the mounting efficiency and structural stability as described above, A hybrid electric vehicle, an electric motorcycle, an electric bicycle and the like which have a mounting space and are exposed to frequent vibration and strong impact, but the scope of application is not limited thereto.

11: electrode assembly
12: Electrode lead
13: Battery cell
20: Pouch type packaging material
22: body part
24: Top surface
26: bottom face
28: notch
30: metal tube
40: Protection circuit
12a: positive lead
12b: cathode lead
42: Cap
50: Module case

Claims (30)

In a method of packaging a lithium secondary battery pack,
A first step of firstly packaging a battery cell including an electrode assembly and an electrolyte;
A second step of secondary packaging the body part of the unit module in which the plurality of primary cells are laminated;
Packaging the top and bottom surfaces of the unit module; And
And arranging the unit modules according to the three steps in a module case,
The secondary packaging in the second step is to be packaged in a plastic tube or a metal tube having a thickness of 250 to 2 mm, both end surfaces corresponding to the upper end surface and the lower end surface,
The packaging material for packaging the upper or lower surface of the unit module according to the above three steps is a protection circuit or a PTC circuit,
The protection circuit or the PTC circuit is sealed and adhered to the plastic tube or the metal tube by using an adhesive material such as an adhesive,
A notch formed in a V-shape or a dotted line is formed in the metal pipe or the plastic pipe. When a gas generated inside the battery reaches a predetermined pressure, the notched portion ruptures and the gas can be discharged to the outside Of the lithium secondary battery pack.
The method according to claim 1,
Wherein the packaging material for the first-stage packaging in the first step is packaged using a pouch-type packaging material made only of a thermoplastic resin that is not dissolved in the electrolyte solution.
3. The method of claim 2,
The thermoplastic resin which is not soluble in the electrolytic solution may be any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), and PET (polyethylene terephthalate) Wherein the secondary battery pack is a battery pack.
The method according to claim 1,
Wherein the packaging material for the first-stage packaging of the first stage is a pouch-type packaging material comprising a metal laminate layer and a thermoplastic resin which is not dissolved in the electrolyte solution outside the metal laminate layer.
5. The method of claim 4,
Wherein the metal laminate layer is an aluminum metal laminate layer.
delete The method according to claim 1,
Wherein the plastic tube is made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), and acrylic resin.
The method according to claim 1,
Wherein the metal tube is made of any one selected from the group consisting of aluminum, iron, nickel, copper, and alloys thereof.
delete delete The method according to claim 1,
The area of the protection circuit or the PTC is equal to the size of the cross section of the plastic pipe or the metal pipe, Wherein the first and second battery packs are packaged in the same manner.

The method according to claim 1,
Wherein the unit module is arranged vertically such that the protection circuit or the PTC circuit attached to the upper surface or the lower surface of the unit module contacts the bottom surface of the module case.
13. The method of claim 12,
Wherein the unit modules are positioned in the same direction as the electrode leads.
The method according to claim 1,
The method of claim 4, wherein the unit modules are arranged horizontally so that one surface of the unit module, except the surfaces on which the electrode leads of the unit module are located, is in contact with the bottom surface of the module case.

15. The method of claim 14,
Wherein the unit module has electrode leads positioned in opposite directions with respect to each other.
A battery cell packaged with a primary packaging material including an electrode assembly and an electrolyte;
The battery cells are stacked, a body portion is packaged with a secondary packaging material, and a lower end surface opposite to the upper end surface, on which the electrode tabs are located, is packaged by a protection circuit or a PTC circuit, and the upper end surface is packaged by a cap assembly Unit module; And
A module case including a plurality of unit modules;
Lt; / RTI >
Wherein the secondary packaging material is a plastic pipe or a metal pipe having a thickness of 250 탆 to 2 mm and open at both end surfaces corresponding to the upper end surface and the lower end surface,
The protection circuit or the PTC circuit is sealed and adhered to the plastic tube or the metal tube by using an adhesive material such as an adhesive,
A V-shaped or point-like notch is formed in the metal pipe or the plastic pipe. When a gas generated inside the battery reaches a predetermined pressure, the notched portion ruptures and the gas can be discharged to the outside. .
17. The method of claim 16,
Wherein the primary packaging material is a pouch-type packaging material made only of a thermoplastic resin that is not dissolved in an electrolytic solution.
18. The method of claim 17,
The thermoplastic resin which is not soluble in the electrolytic solution may be any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), and PET (polyethylene terephthalate) Wherein the battery pack is a battery pack.
17. The method of claim 16,
Wherein the primary packaging material is a pouch-type packaging material having a metal laminate layer embedded therein, and the outside of the metal laminate layer is a thermoplastic resin that is not dissolved in an electrolyte solution.
20. The method of claim 19,
Wherein the metal laminate layer is an aluminum metal laminate layer.
delete 17. The method of claim 16,
Wherein the plastic tube is made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), and acrylic resin.
17. The method of claim 16,
Wherein the metal tube is made of any one selected from the group consisting of aluminum, iron, nickel, copper, and alloys thereof.
delete 17. The method of claim 16,
The area of the protection circuit or the PTC is equal to the size of the cross section of the plastic pipe or the metal pipe, Wherein the battery pack is a battery pack.
17. The method of claim 16,
Wherein the unit modules are vertically arranged so that the protection circuit or the PTC circuit attached to the upper surface or the lower surface of the unit module contacts the bottom surface of the module case.

27. The method of claim 26,
Wherein the unit module has the electrode leads positioned in the same direction.
17. The method of claim 16,
Wherein the unit packs are connected horizontally by arranging unit modules so that one side of the unit packs touches the bottom surface of the module case except for the side where the electrode leads of the unit module are located.
29. The method of claim 28,
Wherein the unit modules have electrode leads positioned in opposite directions to each other. 17. The method of claim 16,
The battery pack may include a power tool; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), and a plug-in hybrid electric vehicle (PHEV); Electric motorcycle including E-bike, E-scooter; Electric golf cart; Electric truck; Wherein the battery pack is used as a power source for an electric commercial vehicle.

Images