KR20110108006A - Middle or large sized battery pack and packaging method thereof - Google Patents

Abstract

The present invention relates to a medium-large battery pack with improved safety and space utilization, and a packaging method thereof, wherein the battery cells are first packaged in a pouch-type packaging material, etc., and then laminated, and the body parts are second-packed in a strong packaging material. The upper side and the lower side are packaged with a material that can be directly assembled into a pack, and have all the advantages of a pouch type packaging material and a packaging material such as metal, and a medium and large battery pack with improved safety and space utilization, and a packaging method thereof.
The packaging method of the present invention provides a medium and large battery pack and a method for packaging a medium and large battery pack for improved safety by improving the packaging process of the battery while maximizing space utilization while being light and compact, and firmly fixing each cell more firmly. to provide.

Description

Medium or large sized battery pack and packaging method

The present invention relates to a medium-large battery pack with improved safety and space utilization, and a packaging method thereof, and more particularly, a plurality of batteries packaged with the pouch-type packaging material by first packaging the battery cell with a pouch-type packaging material using a polymer or the like. The present invention relates to a medium and large battery pack having improved safety and space utilization by secondary packaging of a cell into a metal tube or a plastic tube and a material capable of immediately assembling the pack, and efficiently placing them in a module case.

Recently, lithium secondary batteries capable of charging and discharging have been widely used as energy sources for wireless mobile devices. In addition, it is attracting attention as a power source of electric vehicles, hybrid electric vehicles (HEV), etc., which is proposed as a solution for air pollution of conventional gasoline vehicles and diesel vehicles that used fossil fuels.

Due to the necessity of high output capacity, medium and large devices such as automobiles use a medium and large battery system electrically connected to a plurality of battery cells, and the number of unit modules included in a medium and large secondary battery is gradually increased as the required output or energy density increases. Will gradually increase. Pouch type lithium ion polymer secondary batteries, which are frequently used as unit cells in such medium and large battery systems, have a relatively large size compared to batteries of the same series used in small devices.

In addition, when designing a pack of a medium-large lithium secondary battery used as a power source for an electric vehicle, a plug-in, and a hybrid vehicle, not only a high output is required like a conventional battery, but also a high energy is required. Battery should be high capacity and high output. To this end, a large capacity battery must be mounted in a limited space, or a large number of unit cells must be packaged and used in one lithium secondary battery. As a result, the number of unit cells gradually included in a battery increases. The cell size becomes very large. In this case, not only the packaging process is complicated, but also the thickness of the packaging is increased, and as a result, there may be a problem in that a difficulty in manufacturing process, a decrease in performance, and a decrease in the effect of packaging to use an efficient space may occur.

Therefore, in the manufacture of a packaging method for making such a large-capacity cell and a battery that must include a large number of unit cells, the need for research on the packaging method of a simple and efficient lithium secondary battery is increasing.

The present invention has been made to solve the above problems, while in the manufacture of a medium-large battery pack used as a power source for hybrid and electric vehicles, while being able to easily package a large number of battery cells and unit modules while existing cell packaging material Maintaining all of the advantages, as well as maximizing the utilization of the internal space when assembling the pack, provides a high capacity medium-large battery pack and its packaging method with improved safety.

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

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

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

A second step of secondary packaging a body portion of a unit module in which the plurality of primary packaged battery cells are stacked;

Packaging the upper and lower surfaces of the unit module; And

It provides a packaging method of a lithium secondary battery pack, characterized in that consisting of four steps of arranging the unit module by the three steps in the module case.

The packaging material for the primary packaging of the first step is characterized in that the packaging using a pouch-type packaging material consisting of only a thermoplastic resin that does not dissolve in the electrolyte.

The thermoplastic resin that is not dissolved in the electrolyte solution is any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), PET (polyethylene terephthalate) Characterized in that,

The packaging material for the primary packaging of the first step is characterized in that the pouch-type packaging material is made of a thermoplastic resin that is embedded in the metal laminate layer and the outside of the metal laminate layer is not dissolved in the electrolyte solution.

In addition, the metal laminate layer is characterized in that the aluminum metal laminate layer.

The secondary packaging of the second step, characterized in that the packaging to the plastic tube or metal tube is open at both end surfaces corresponding to the top and bottom surfaces,

The plastic tube is characterized in that made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), acrylic resin,

The metal tube is characterized in that it is made of any one selected from the group consisting of aluminum, iron, nickel, copper or alloys thereof.

On the other hand, the metal tube or the plastic tube is characterized in that the notch (notch) is formed.

In addition, the packaging material for packaging the upper or lower surface of the unit module according to the three steps, characterized in that the protective circuit or PTC circuit.

The area of the protective circuit or PTC is equal to the size of the cross section of the plastic tube or the metal tube or by 0.2 mm to 2 cm. Characterized by a larger,

In step 4, the unit modules are vertically arranged such that a protection circuit or a PTC circuit attached to an upper surface or a 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 lead is located in the same direction.

In addition, the step 4, characterized in that the unit module is arranged horizontally so that any surface, except for the surface on which the electrode lead of the unit module is positioned to contact the bottom surface of the module case, wherein the unit module The electrode leads are each positioned in opposite directions to each other.

The present invention, on the other hand, a battery cell packaged as a primary packaging material including an electrode assembly and an electrolyte;

After stacking the battery cells and packaging a body part with a secondary packaging material, a unit module in which a surface opposite to a surface on which an electrode tab is positioned is packaged by a protection circuit or a PTC circuit, and a surface on which an electrode tab is positioned by a cap assembly is packaged. ; And

A module case including a plurality of unit modules;

It provides a medium-large battery pack comprising a.

The primary packaging material is characterized in that the pouch-type packaging material consisting of only thermoplastic resins that do not dissolve in the electrolyte,

The thermoplastic resin that is not dissolved in the electrolyte solution is any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), PET (polyethylene terephthalate) It is characterized by that,

The primary packaging material is a metal laminate layer is built-in, the outside of the metal laminate layer is characterized in that the pouch-type packaging material made of a thermoplastic resin that does not dissolve in the electrolyte solution,

The metal laminate layer is characterized in that the aluminum metal laminate layer.

In addition, the secondary packaging material, characterized in that the plastic tube or metal tube is open at both end surfaces corresponding to the top and bottom surfaces,

The plastic pipe is made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), acrylic resin, the metal tube is aluminum, iron, nickel , Copper, or any one selected from the group consisting of alloys thereof.

On the other hand, the metal tube or the plastic tube is characterized in that the notch (notch) is formed.

In addition, the area of the protective circuit or PTC is equal to the size of the cross section of the plastic tube or the metal tube or by 0.2 mm to 2 cm. It is characterized by a larger one.

The battery pack is characterized in that the unit modules vertically arranged so that the protection circuit or PTC circuit attached to the upper surface or the lower surface of the unit module is in contact with the bottom surface of the module case, wherein the unit module is The electrode leads are located in the same direction.

In addition, the battery pack is characterized in that the unit modules are arranged in a horizontal manner so as to contact the bottom surface of the module case, except for the surface on which the electrode lead of the unit module is located, wherein the unit The module is characterized in that the electrode leads are located in opposite directions to each other.

The battery pack includes a power tool; Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); Electric two-wheeled vehicles including E-bikes and E-scooters; Electric golf carts; Electric trucks; Characterized in that used as a power source for electric commercial vehicles.

By the method for packaging a medium-large battery pack according to the present invention, while improving the packaging step of the medium-large battery pack used as a power source for hybrid electric vehicles, while maintaining the advantages of the existing packaging materials, the safety of the medium-large battery pack and its manufacturing method with excellent safety to provide.

In addition, by maximizing the space utilization when assembling the pack, it is light and compact, but each unit cell and unit modules are firmly fixed to the inside, so that in the medium and large battery packs frequently exposed to frequent vibrations or strong shocks, structural safety is further improved. An improved battery pack and a method of manufacturing the same are provided.

1 is a schematic perspective view of a battery cell for packaging an electrode assembly and an electrolyte into a primary packaging material.
2A and 2B are perspective views of a unit module in which a plurality of battery cells are stacked to package a body part into a secondary packaging material, viewed from the top and bottom surfaces thereof.
3A and 3B are perspective views of a unit module packaged with a secondary packaging material having a notch formed in a body part, as viewed from the top and bottom surfaces thereof.
FIG. 4 is a perspective view illustrating a step of packaging a bottom surface of a unit module in which a body portion is packaged with a secondary packaging material. FIG.
5 is a perspective view of a unit module packaged with a body portion and a bottom surface as viewed from the bottom surface;
6A to 6C are perspective views illustrating packaging of an upper surface of a unit module according to a connection form of a plurality of battery cell tabs.
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 tabs.
8A to 8C are perspective views schematically illustrating a state in which a unit module packaged according to a connection form of a plurality of battery cell tabs is disposed in a module case.

Packaging method of the medium-large battery pack according to the present invention in order to achieve the above object,

First packaging the battery cell including the electrode assembly and the electrolyte;

Stacking or parallel connection of the plurality of primary battery cells Alternatively, the second step of making a unit module by connecting in any one of the series connection method and secondary packaging only the body part except the upper and lower parts;

Packaging the upper and lower ends of the secondary packaged unit module; And fixing the unit modules packaged in the upper and lower ends to a module case to assemble the pack.

The object of the present invention is also,

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

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

A module case in which a plurality of unit modules are connected and included; It may be made to provide a medium-large battery pack comprising a.

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

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

First, in the first step, the battery cell 13 including the electrode assembly 11 and the electrolyte is first packaged using the pouch-type packaging material 20 or the like.

The pouch-type packaging 20 for the primary packaging is satisfied if it is a thermoplastic resin of a material that does not dissolve in the electrolyte, for example PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride) Pouch type packaging material consisting of nylon (polyamide) and PET (polyethylene terephthalate) is used.

In addition, the pouch-type packaging material 20 may be a pouch-type packaging material further containing a metal laminate layer such as aluminum laminate 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 composed of only the thermoplastic resins listed above, depending on the material of the secondary packaging material described below. That is, if the secondary packaging material for packaging of the second step is a material capable of permeation of moisture and electrolyte, the primary packaging material, that is, the pouch type packaging material, is preferably packaged using a pouch type packaging material in which metal is further embedded.

In the case of a pouch type packaging material in which a metal laminate layer is further embedded, the exterior of the metal laminate is coated with the thermoplastic resin, so that the insulating property is excellent, and since the metal is embedded, the strength is excellent, and the moisture or the electrolyte is transferred to the unit cell. Do not infiltrate.

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

In general, secondary batteries are classified into, for example, lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc., depending on the structure of the electrode assembly and the composition of the electrolyte. Among them, the manufacturing cost is low and there is little possibility of leakage of the electrolyte solution. In addition, a lithium ion polymer battery having a simple battery assembly process may be preferably used in the present invention.

One end of the electrode lead 12 is located inside the pouch-type packaging with the electrode tabs of the electrode assembly attached, and the opposite end is exposed to the outside of the pouch-type packaging. Among the electrode leads, the anode lead is not particularly limited, and a metal foil made of aluminum that can be used generally can be used, and the cathode lead can also use a metal foil made of copper, which is generally used. The electrode tabs may be coupled to the electrode lead by a conventional method such as spot welding, and the thickness of the electrode lead is preferably about 200 to 500 μm.

In the lithium secondary battery of the present invention, the electrode assembly 11 of the positive electrode / separation membrane / cathode in which the electrolyte is impregnated in the pouch-type packaging material 20 is seated, and a high temperature and high pressure is applied to the junction portion of the pouch-type packaging material to be fused. Seal.

As described above, the primary packaging of the battery cell is made by using a thermoplastic resin or the like, and then polymer pouch-type packaging material that can be easily vented when gas is generated inside the cell according to the use of the battery and safety accidents. By maintaining the advantages of the intact, it is possible to prevent the risk caused by the generation of gas in use, and first packaging the battery cell in a flexible pouch-type packaging material, the leakage of electrolyte, etc. contact with the battery cell and metal packaging material It is possible to prevent insulation phenomenon.

In addition, according to the material of the secondary packaging material, by selecting one of the polymer pouch-type packaging material with a metal laminate layer or a pouch-type packaging material consisting of polymer only to improve the safety of the battery while compact and rigid and lightweight lithium secondary battery Can provide.

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

According to the packaging method of the present invention, a plurality of battery cells firstly packaged by the pouch-type packaging material is sequentially stacked, and the unit module in which the first-packaged battery cells are stacked is firstly a secondary body only. Packaged.

2A and 2B are perspective views illustrating a state of secondary packaging only the body part 22 of the unit module.

In the unit module in which the plurality of battery cells are stacked, a surface on which the electrode lead 12 protrudes is called an upper surface 24, and an opposite surface thereof is called a lower surface 26, and the upper surface 24 and the lower surface The part consisting of other surfaces except for (26) is called the body part (22).

In the second step of the lithium secondary battery packaging method of the present invention, only the body portion 22 of the unit module is first packaged. To this end, the unit modules in which the battery cells are stacked are inserted as they are using a secondary packaging material formed of a plastic tube or a metal tube 30 having both ends corresponding to the top surface 24 and the bottom surface 26 open. .

That is, by packaging only the body part of the unit module including the plurality of battery cells that are primarily packaged in the metal tube 30 or the plastic tube, the outside of the primary packaged pouch-type packaging material is formed in the metal tube 30. Or plastic tube.

Thus, by packaging the secondary packaging using a higher strength packaging material to securely fix the outside of the unit module to suppress the swelling phenomenon of the pouch-type packaging material 20 and to package the outside of the battery firmly to the outside of the medium and large batteries It protects the battery from shocks and the like so that the unit cell or the unit module can be secured in structure.

In addition, the upper surface 24 and the lower surface 26 are secondary packaging using the open metal tube 30 or the plastic tube, and the process is easier and more convenient since the unit module is simply inserted as it is. It can be done.

The metal tube 30 for secondary packaging may be made of any one selected from the group consisting of aluminum, tin, chromium, iron, nickel, copper, and alloys thereof, and the plastic tube may be PE (polyethylene), PP (poly) Propylene), PS (polystyrene), PVC (vinyl chloride), may be made of any one selected from the group consisting of acrylic resins. However, it is preferable to use a metal tube made of aluminum. This is because the weight is light while having the strength that can most effectively prevent the swelling of the pouch type packaging material. 2A and 2B illustrate a case in which a secondary packaging material is used as the metal tube 30 as an embodiment of the present invention.

When using the metal tube 30, such as aluminum, as a secondary packaging material as mentioned above, it is preferable to use the pouch type packaging material which does not contain a metal laminate as a primary packaging material. In this case, it is possible to prevent the protrusion of the metal laminate layer and the battery insulation caused by cutting the edge of the sealing portion of the pouch-type packaging material after the primary packaging, while also providing a high strength of the exterior material and effectively suppressing the swelling phenomenon. A lithium secondary battery can be provided.

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

In the case of a small square battery, a can type packaging material having a thickness of about 200-250um is generally used, but it is difficult to suppress swelling of the battery, and the maximum thickness is preferably 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 rectangle, but the present invention is not limited thereto, and the shape of the metal tube or the plastic tube may be formed in various forms such as a square or a circle.

Meanwhile, a fine V-shaped or dotted notch is formed on the outside of the secondary packaging material such as the metal tube or the plastic tube that secondaryly packages the body part so that venting of the internal gas can occur more easily. Can be formed.

In this way, by using a secondary packaging material including a notch on the outside, the gas generated inside can be vented out more easily. As a result, the high strength of the double packaging and the secondary packaging material can eliminate the risk of an event such as an increase in pressure inside the cell or an increase in temperature.

That is, when the gas generated inside the battery is at a constant pressure, the portion where the notch is formed can be easily discharged while being ruptured, thereby inducing the discharge of the internal gas toward the notch. Therefore, it is possible to effectively control the pressure or discharge direction of the exhaust gas by using the number, shape, location of the notch.

3A and 3B illustrate an exemplary secondary packaging material in which a V-shaped notch 28 is formed in a body portion of a unit module as an embodiment of the present invention. However, this is only one embodiment and the present invention is not limited thereto, and the shape, position and number of the notches may be changed according to the pressure and direction of the desired discharge gas.

In addition, in the case of using the secondary packaging material having a notch formed as described above, it is possible to use the secondary packaging material in which both the upper and lower surfaces are open as described above, and one of the upper and lower surfaces is blocked, and the conventional rectangular type is blocked. May be used.

On the other hand, after the secondary packaging of the body portion 22 of the unit module, the open top face 24 and bottom face 26 are packaged. 4 to 7C illustrate a method of packaging the top surface 24 and the bottom surface 26 of the unit module, of which FIGS. 6A to 6C and 7A to 7C are top surfaces of the unit module. Figures are illustrated according to the connection form of a plurality of electrode tabs protruding into the.

Referring to the drawings, as shown in FIG. 4, the lower surface 26 of the unit module is covered with a protective circuit 40 or a PTC circuit included in the packaging of a lithium secondary battery, followed by adhesive or the like. Seal to be combined with metal pipes or plastic pipes.

At this time, the area of the protection circuit 40 or the PTC circuit used is the same as the area of the upper surface 24 or the lower surface 26 or as large as 0.2mm to 2cm size. This is because when the modules of the both ends of the packaging is arranged in series in the module case, the protective circuit 40 or the bottom surface 26 packaged with the PTC circuit is fixed to the bottom of the module case and arranged vertically By doing so, the unit modules can be secured more securely and firmly in the module case. Therefore, the larger the area of the protective circuit 40 or the PTC circuit attached to the bottom surface 26, the more securely assembled cells can be fixed. 5 is a perspective view illustrating a state in which the lower surface 26 of the unit module is sealed with a protection circuit 40 having a larger area.

This makes it possible to provide a medium-sized lithium secondary battery that is more structurally safe in a medium-large-sized battery for automobiles having a lot of shock and shaking.

The adhesive for sealing the protective circuit 40 or the PTC circuit and the metal tube 30 or the plastic tube is not particularly limited, and may be sealed using acrylic resin, polyethylene, polyester resin, or the like, or by using a pitch 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 protective circuit or the PTC circuit is bonded to the metal tube or the plastic tube can be vented more easily than other portions of the secondary packaged packaging material. As part, it can be a passage through which internal gas can be discharged out. That is, the secondary packaging materials of the body portion and the upper and lower surfaces of the unit module are made of a material of high strength that does not swell well, and gas is difficult to be vented. Likewise, the protective circuit and the metal tube are guided to the lower sealing part to which they are bonded. Also, the body part where a lot of internal gas is generated is held firmly by a metal tube or a plastic tube of high strength. It provides the effect of applying pressure so that it can be discharged out and inducing the gas to be vented toward the lower sealing part. Due to such an effect, it is possible to lower the risk of explosion of the unit module due to gas generation inside the battery cell, thereby providing a battery pack having improved safety.

Meanwhile, the upper surface 24 of the unit module is connected to each of the electrode tabs protruding from each battery cell, as shown in the embodiments shown in FIGS. 6A and 6B, to one positive lead 12a and negative lead 12b. It can be protruded. As described above, in the case of packaging the top surface after connecting each tab to form one electrode lead, the packaging process may be simplified, but in the case of a unit module including a plurality of battery cells, one anode The amount of current loaded on the leads and the cathode leads may be excessive. Preferably, the unit module may be formed such that a plurality of electrode leads protrude as shown in FIG. 6C. 6A through 6C illustrate examples according to the present invention, but the present invention is not limited thereto, and the tabs of various shapes and numbers are considered in consideration of the capacity of the unit module and the simplification of the packaging process. Of course you can.

The electrode leads 12a and 12b are then sealed with a cap 42 designed to be fixed out of the cell. The cap 42 is equal to the area of the upper surface 24 and is not particularly limited in material and the like, and is satisfied by using a known battery packaging assembly cap and the like, and corresponding to the shape and number of electrode leads formed. It is characterized in that the assembly cap including the opening.

On the other hand, when using a conventional rectangular type secondary packaging material having a notch (notch), there is no need for a separate packaging of the lower end, but in the packaging of the upper end where the electrode lead is located, the above method is followed.

7A to 7C are perspective views schematically illustrating the shape of a unit module in which the packaging steps of the second and third steps are completed according to the lithium secondary battery packaging method of the present invention, wherein the protruding electrode leads have different shapes. Perspective view.

The body module 22 and the unit modules having completed packaging of the upper surface 24 and the lower surface 26 are arranged in series in the module case.

8A to 8C are schematic perspective views of shapes in which primary and secondary packaged unit modules are serially arranged in a module case 50 according to an embodiment of the present invention. The arrangement of the unit modules in the module cases shown in FIGS. 8A to 8C shows one embodiment, and the unit modules according to the present invention may be stacked or arranged in a module case in more various forms. 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 include two, three, or five or more configurations.

As shown in FIGS. 8A to 8C, the protection circuit 40 or the PTC circuit attached to the bottom surface 26 of the unit module is positioned downward so that it is attached to the bottom surface of the module case 50. The modules are arranged in series to firmly fix the protective circuit to the bottom of the module case 50.

As such, the lower surface 26 of the unit module is packaged using the protection circuit 40 or the PTC circuit, so that the protection circuit 40 or PTC is located in a separate space when the battery pack is assembled. The space utilization of the can be maximized, and further, the unit modules can be firmly fixed to the module case 50 without using a separate failure device. As a result, it is possible to provide a medium-large-size lithium secondary battery that is light, compact and excellent in safety.

On the other hand, when the electrode leads of the unit module by the secondary packaging are not located at the top surface but in different directions, one of the end surfaces at which the electrode leads are positioned may be formed by using a protection circuit or a PTC circuit. After sealing, it is sealed with metal or plastic pipe and adhesive. At this time, the adhesive used for bonding is the same as the above adhesive and bonding method.

In the above case, the area of the protective circuit or PTC circuit used for the packaging of the top or bottom surface is the same as the area of the top or bottom of the metal tube or plastic tube, or is designed to be 0.2mm to 2cm larger, so that the unit cell or Package the unit module.

The surface opposite to the surface sealed by the protection circuit or PTC circuit is formed by using a cap formed so that the electrode lead can protrude. Package it.

As described above, the packaged unit modules at both ends are also arranged in series in the module case. At this time, the packaged unit cell or unit module is arranged so that any one surface of the narrow side of the surface except the both sides of the electrode lead is in contact with the bottom of the module case. At this time, the protection circuit or PTC circuit which is attached to either side of the left and right sides of the unit module arranged in the module case can be firmly attached to the side of the module case to achieve structural stability of the battery. .

The medium-large battery manufactured according to the packaging method of the present invention may be manufactured by combining a plurality of battery cells or unit modules according to a desired output and capacity, and in consideration of mounting efficiency, structural stability, and the like as described above, Although it may be preferably used as a power source of an electric vehicle, a hybrid electric vehicle or an electric motorcycle, an electric bicycle having a mounting space and exposed to frequent vibrations and strong shocks, 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 side
26: bottom surface
28 notch
30: metal tube
40: protection circuit
12a: positive lead
12b: cathode lead
42: cap
50: module case

Claims (30)

In the packaging method of the lithium secondary battery pack,
A first step of packaging a battery cell including an electrode assembly and an electrolyte;
A second step of secondary packaging a body portion of a unit module in which the plurality of primary packaged battery cells are stacked;
Packaging the upper and lower surfaces of the unit module; And
Packaging method of a lithium secondary battery pack, characterized in that consisting of the four steps of arranging the unit module by the three steps in the module case.
The method of claim 1,
The packaging method for the primary packaging of the first step is a packaging method of a lithium secondary battery pack, characterized in that the packaging using a pouch-type packaging material consisting of only a thermoplastic resin that does not dissolve in the electrolyte.
The method of claim 2,
The thermoplastic resin that is not dissolved in the electrolyte solution is any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), PET (polyethylene terephthalate) Packaging method of a lithium secondary battery pack, characterized in that.
The method of claim 1,
The packaging material for the primary packaging of the first step is a packaging method of a lithium secondary battery pack, characterized in that the metal laminate layer is built-in, the outside of the metal laminate layer is a pouch-type packaging material made of a thermoplastic resin that does not dissolve in the electrolyte.
The method of claim 4, wherein
The metal laminate layer is a packaging method of a lithium secondary battery pack, characterized in that the aluminum metal laminate layer.
The method of claim 1,
The secondary packaging of the second step, the packaging method of the lithium secondary battery pack, characterized in that for packaging with a plastic tube or a metal tube is open at both end surfaces corresponding to the top and bottom surfaces.
The method of claim 6,
The plastic tube is a packaging method of a lithium secondary battery pack, characterized in that made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), acrylic resin.
The method of claim 6,
The metal tube is a packaging method of a lithium secondary battery pack, characterized in that made of any one selected from the group consisting of aluminum, iron, nickel, copper or alloys thereof.
The method of claim 6,
The method of packaging a lithium secondary battery pack, characterized in that the notch (notch) is formed in the metal tube or plastic tube.
The method of claim 1,
Packaging method for packaging the upper surface or the lower surface of the unit module according to the three steps, the packaging method of the lithium secondary battery pack, characterized in that the protection circuit or PTC circuit.
The method of claim 10,
The area of the protective circuit or PTC is equal to the size of the cross section of the plastic tube or the metal tube or by 0.2 mm to 2 cm. Packaging method of a lithium secondary battery pack, characterized in that larger.

The method of claim 1,
The fourth step, the packaging method of the lithium secondary battery pack, characterized in that the vertical arrangement of the unit module so that the protection circuit or PTC circuit attached to the top or bottom surface of the unit module to the bottom surface of the module case.
The method of claim 12,
The unit module is a packaging method of a lithium secondary battery pack, characterized in that the electrode lead is located in the same direction.
The method of claim 1,
The method of claim 4, wherein the unit module is arranged horizontally so that one surface of the unit module is in contact with the bottom surface of the module case, except for the surface on which the electrode lead is located.

The method of claim 14,
The unit module is a packaging method of a lithium secondary battery pack, characterized in that the electrode leads are located in opposite directions to each other.
A battery cell packaged as a primary packaging material including an electrode assembly and an electrolyte solution;
After stacking the battery cells and packaging a body part with a secondary packaging material, a unit module in which a surface opposite to a surface on which an electrode tab is positioned is packaged by a protection circuit or a PTC circuit, and a surface on which an electrode tab is positioned by a cap assembly is packaged. ; And
A module case including a plurality of unit modules;
Medium and large battery pack containing.
The method of claim 16,
The primary packaging material is a medium-large battery pack, characterized in that the pouch-type packaging material consisting of only a thermoplastic resin that does not dissolve in the electrolyte.
The method of claim 17,
The thermoplastic resin that is not dissolved in the electrolyte solution is any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), nylon (polyamide), PET (polyethylene terephthalate) Medium and large battery pack, characterized in that.
The method of claim 16,
The primary packaging material is a medium-large battery pack, characterized in that the metal laminate layer is built-in, the outside of the metal laminate layer is a pouch-type packaging material made of a thermoplastic resin that does not dissolve in the electrolyte.
20. The method of claim 19,
The metal laminate layer is a medium-large battery pack, characterized in that the aluminum metal laminate layer.
The method of claim 16,
The secondary packaging material is a medium-large battery pack, characterized in that the plastic tube or the metal tube is open at both end surfaces corresponding to the top and bottom surfaces.
The method of claim 21,
The plastic pipe is a medium-large battery pack, characterized in that made of any one selected from the group consisting of PE (polyethylene), PP (polypropylene), PS (polystyrene), PVC (vinyl chloride), acrylic resin.
The method of claim 21,
The metal tube is a medium-large battery pack, characterized in that made of any one selected from the group consisting of aluminum, iron, nickel, copper or alloys thereof.

The method of claim 21,
The large or medium battery pack, characterized in that the notch (notch) is formed in the metal tube or plastic tube.
The method of claim 16,
The area of the protective circuit or PTC is equal to the size of the cross section of the plastic tube or the metal tube or by 0.2 mm to 2 cm. Medium and large battery packs, characterized in that larger.
The method of claim 16,
The battery pack is a medium-large battery pack, characterized in that the protection module or PTC circuit attached to the upper surface or the lower surface of the unit module vertically arranged to connect the unit modules so as to contact the bottom surface of the module case.

The method of claim 26,
The unit module is a medium-large battery pack, characterized in that the electrode lead is located in the same direction.
The method of claim 16,
The battery pack is a medium-large battery pack, characterized in that to connect any one side of the module module horizontally arranged so as to contact the bottom surface of the module case, except for the surface on which the electrode lead is located.
The method of claim 28,
The unit module is a medium-large battery pack, characterized in that the electrode leads are located in opposite directions to each other. The method of claim 16,
The battery pack includes a power tool; Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); Electric two-wheeled vehicles including E-bikes and E-scooters; Electric golf carts; Electric trucks; Medium and large battery packs, characterized in that used as a power source for electric commercial vehicles.

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