KR102464974B1 - Battery Cell Comprising Battery Case with Laminate Sheet and Metal Plates and Method for Preparing Thereof - Google Patents

Abstract

A battery cell in which an electrode assembly including a positive electrode, a negative electrode, and a separator is embedded in a battery case together with an electrolyte, the battery case comprising:
a body comprising a laminate sheet including a resin layer and a metal layer, the upper and lower ends of which are open, respectively, and having a hollow structure in which an electrode assembly is embedded;
a top plate coupled to the open upper end of the main body, the first electrode terminal to which the first electrode of the electrode assembly is connected, and the second electrode terminal to which the second electrode is connected, made of a metal material; and
a lower plate coupled to the open lower end of the body and made of a metal material;
It relates to a battery cell comprising a and a method for manufacturing the same.

Description

Battery Cell Comprising Battery Case with Laminate Sheet and Metal Plates and Method for Preparing Thereof

This application claims the benefit of priority based on Korean Patent Application No. 10-2017-0020496 dated February 15, 2017, and all contents disclosed in the documents of the Korean patent application are incorporated as a part of this specification.

The present invention relates to a battery cell including a battery case made of a laminate sheet and a metal plate, and a method for manufacturing the same, and specifically, a body in which an electrode assembly is embedded is made of a laminate sheet including a resin layer and a metal layer, and the body The upper plate and the lower plate coupled to each of the open upper end and the open lower end of the battery cell having a structure made of a metal material and a method for manufacturing the same.

As technology development and demand for mobile devices increase, the demand for batteries as an energy source is rapidly increasing, and accordingly, a lot of research on batteries capable of meeting various needs is being conducted.

The secondary battery is a jelly-roll type (winding type) electrode assembly, in which a long sheet-type positive electrode and negative electrode are wound with a separator interposed therebetween, depending on the structure of the electrode assembly of the positive electrode/separator/negative electrode structure. A stacked (stacked) electrode assembly in which a number of positive and negative electrodes cut in units of size are sequentially stacked with a separator interposed therebetween, and unit cells in which a predetermined unit of positive and negative electrodes are stacked with a separator interposed therebetween. and a stack/folding type electrode assembly having a structure.

In addition, depending on the shape of the battery case, the secondary battery consists of a cylindrical battery and a prismatic battery in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and a pouch-type battery in which the electrode assembly is embedded in a pouch-type case of an aluminum laminate sheet. classified.

In particular, in recent years, a relatively narrow prismatic battery has been developed in accordance with the miniaturization and weight reduction trend of mobile electronic devices, and such a prismatic battery creates another application field from the conventional cylindrical battery.

In general, a prismatic battery is manufactured by inserting some battery elements into a prismatic hollow case with a sealed lower end, welding an upper cap assembly, injecting electrolyte, and sealing an injection hole.

However, since a prismatic battery generally uses a metal can made of a metal alloy plate as a battery case, it has a problem in that it weighs a lot compared to a pouch-type case of a laminate sheet, and a battery case composed of a thin metal plate is manufactured. As a result, there is a limit to improving the energy density of the battery.

Therefore, in order to improve the energy density of the prismatic battery, there is an urgent need for a technology for implementing a lighter and smaller battery case.

An object of the present invention is to solve the above problems.

Specifically, an object of the present invention is to form a battery case in a prismatic battery cell with a hollow body made of a laminate sheet, a metal top plate coupled to the top of the body, and a metal bottom plate coupled to the bottom of the body. To provide a prismatic battery cell with improved energy density by reducing the volume and weight occupied by the battery case in the prismatic battery cell.

In order to achieve the above object, the battery cell of the present invention,

A battery cell in which an electrode assembly including a positive electrode, a negative electrode, and a separator is embedded in a battery case together with an electrolyte, wherein the battery case is made of a laminate sheet including a resin layer and a metal layer, and the upper and lower ends are open, respectively. , A body having a hollow structure in which an electrode assembly is embedded, coupled to an open upper end of the body, a first electrode terminal to which the first electrode of the electrode assembly is connected, and a second electrode terminal to which the second electrode is connected, It is coupled to the upper plate made of a metal material, and the open lower end of the body, may be made of a structure including a lower plate made of a metal material.

The electrode assembly may have a jelly-roll type structure, a stack/folding type structure, or a lamination/stack type structure.

The laminate sheet includes a first resin layer forming an inner surface of the main body, a second resin layer forming an outer surface of the main body, and a metal layer interposed between the first resin layer and the second resin layer can be made with

The first resin layer and the second resin layer may be made of the same material.

The body may have a structure in which both ends are mutually joined by folding a laminate sheet into a square shape, and the upper plate and the lower plate may be formed in a rectangular shape in plan view.

Alternatively, the body may have a structure in which a tubular laminate sheet is bent into a square shape, and the upper plate and the lower plate may have a rectangular shape in plan view.

Alternatively, the body may have a cylindrical structure made of a tubular laminate sheet, and the top plate and the bottom plate may be formed in a circular or oval shape on a plane.

The material of the upper plate and the material of the lower plate may be each independently at least one selected from the group consisting of aluminum, aluminum alloy, copper, copper alloy, nickel, nickel alloy, and stainless steel.

The first electrode terminal of the top plate is connected to the negative electrode of the electrode assembly, and may be formed to protrude upward from the center of the top plate.

The second electrode terminal of the top plate is connected to the positive electrode of the electrode assembly, and may be formed on the remaining portion of the top plate except for the first electrode terminal.

The upper plate and the lower plate may be coupled in a state in which the outer periphery of the plate is welded to the end of the metal layer in the laminate sheet of the body, respectively.

The laminate sheet may have a structure including a first resin layer forming an inner surface of the main body, and a metal layer forming an outer surface of the main body.

An insulating sheet may be further included on the outer surface of the metal layer.

The thickness of the body may be in the range of 50 μm to 150 μm.

An auxiliary sealing member made of a resin material may be added to a connection portion between the main body and the upper plate and/or the lower plate.

The present invention is a method for manufacturing a battery cell,

(a) preparing a body made of a laminate sheet including a resin layer and a metal layer;

(b) combining the main body and the lower plate;

(c) accommodating the electrode assembly in the hollow of the main body; and

(d) coupling the body and the top plate in which the electrode assembly is accommodated;

Including, wherein the laminate sheet, a first resin layer forming the inner surface of the main body, a second resin layer forming the outer surface of the main body, and a metal layer interposed between the first resin layer and the second resin layer In the step (b), the lower plate is coupled to the lower end of the laminate sheet metal layer as the main body, and in step (d), the upper plate is coupled to the upper end of the laminate sheet metal layer as the main body. A method for manufacturing a battery cell is provided.

Alternatively, the laminate sheet has a structure including a first resin layer forming an inner surface of the main body, and a metal layer forming an outer surface of the main body, and after step (d), insulating the outer surface of the metal layer of the main body It may consist of a process further comprising the step (e) of adding a sheet

As described above, in the prismatic battery cell according to the present invention, the main body of the prismatic battery case is made of a laminate sheet, and the upper and lower ends of the prismatic battery case are made of a metal material, thereby reducing the thickness of the battery case to increase the energy of the prismatic battery. density can be improved.

In addition, the upper and lower ends of the battery case are made of durable metal to improve the energy density by reducing the volume of the battery case and to secure the safety of the battery against external physical force or impact that may be applied to the battery while the battery is in use. It is possible to provide a safe battery cell by configuring it with a material.

1 is an exploded perspective view of a battery case according to an embodiment of the present invention.
2 is a perspective view illustrating a state in which the upper plate and the electrode assembly of FIG. 1 are combined.
3 is a partially enlarged view of the laminate sheet of FIG. 1 .
4 is a perspective view illustrating a battery cell manufacturing process.
5 is a perspective view of a battery cell according to another embodiment.

Therefore, the prismatic battery cell according to the present invention,

A battery cell in which an electrode assembly including a positive electrode, a negative electrode, and a separator is embedded in a battery case together with an electrolyte, the battery case comprising:

a body comprising a laminate sheet including a resin layer and a metal layer, the upper and lower ends of which are open, respectively, and having a hollow structure in which an electrode assembly is embedded;

a top plate coupled to the open upper end of the main body, the first electrode terminal to which the first electrode of the electrode assembly is connected, and the second electrode terminal to which the second electrode is connected, made of a metal material; and

It is coupled to the open lower end of the main body, and may include a lower plate made of a metal material.

As described above, since the battery case body part in which the electrode assembly and the electrolyte are embedded is made of a laminate sheet including a resin layer and a metal layer, the effect of reducing the thickness and weight of the battery case can be obtained.

However, when the laminate sheet constitutes the entire outer surface of the battery case, safety is weakened when an impact such as a drop of the battery cell is applied. By applying the member, the above problems can be solved.

The structure of the electrode assembly is not particularly limited. For example, it may have a stack-type structure, a jelly-roll-type structure, a stack/folding structure, or a lamination/stack-type structure.

The laminate sheet constituting the battery case includes a first resin layer forming an inner surface of the main body, a second resin layer forming an outer surface of the main body, and interposed between the first resin layer and the second resin layer It may have a structure including a metal layer.

Since the first resin layer faces the surface where the electrode assembly and the electrolyte are embedded, it must be composed of an insulating resin that can maintain insulation from the battery case even during operation of the battery, and reacts with the electrolyte or comes into contact with the electrode assembly Even if it is, it is required to be durable enough not to tear or peel off.

Since the second resin layer serves to protect the battery from the outside, it should have excellent tensile strength and durability so that the metal layer located therein is not easily peeled off or torn by an external physical force.

The first resin layer and the second resin layer may be made of the same material or may be made of different materials, specifically, polyester (PE), polypropylene (PP), polyethylene terephthalate (PET) , may be composed of at least one selected from the group consisting of Teflon-based resins, vinylon-based resins, and nylon-based resins.

In general, since the laminate sheet constituting the pouch-type battery case is sealed by heat sealing, it includes an inner sealant layer and an outer resin layer made of different materials. That is, the inner sealant layer is made of a material that is melted and fused when pressed at a high temperature.

However, in the present invention, since the heat sealing process for sealing the battery case is not performed, a layer corresponding to the internal sealant layer included in the conventional pouch-type battery case may not be applied to the laminate sheet.

Therefore, it is not particularly limited as long as it is a material having electrolyte resistance, insulation and durability, and the first resin layer and the second resin layer may be made of the same material.

The metal layer serves to prevent air, moisture, etc. from entering the inside of the battery, and serves to firmly maintain the battery case against physical forces that may occur inside and outside the battery during use or movement of the battery. do The material of the metal layer may be made of a metallic material such as aluminum, an aluminum alloy, copper, a copper alloy, nickel, a nickel alloy, and stainless steel.

On the other hand, as the thickness of the first resin layer, the metal layer and the second resin layer constituting the laminate sheet increases, durability increases and it may be advantageous for securing the safety of the battery, but the volume and weight occupied by the battery case in the battery increases. Accordingly, there is a fear of greatly reducing the energy density of the battery, and it is preferable to have a thinner thickness than a conventionally used metal plate. Specifically, it is preferable that the thickness of the body constituted of the laminate sheet is in the range of 50 to 150 µm.

The body according to the present invention may have a structure in which both ends are mutually joined by folding a laminate sheet into a square shape, and the upper plate and the lower plate may be formed in a rectangular shape in plan view.

Specifically, it can be manufactured by folding the laminate sheet of one unit into a square shape and then connecting both ends to each other in a hollow structure.

Alternatively, the body may have a structure in which a tubular laminate sheet is bent into a square shape, and the upper plate and the lower plate may have a rectangular shape in plan view.

Alternatively, the body may have a cylindrical structure made of a tubular laminate sheet, and the top plate and the bottom plate may be formed in a circular or oval shape on a plane. In this case, it may be formed in a shape similar to that of a conventional cylindrical electrode assembly in appearance.

The battery case according to the present invention may be manufactured by coupling a top plate made of a metal material to an upper end of a hollow body, and coupling a bottom plate made of a metal material to the lower end of the body. An electrode terminal may be formed on the top plate like a general prismatic battery. A positive terminal and a negative terminal may be formed on the top plate.

In more detail, one or two electrode terminals may be formed on the top plate, and a first electrode terminal formed in a structure protruding upwardly from the center of the top plate may be formed. In addition, the second electrode terminal may be formed on the remaining portion of the top plate except for the first electrode terminal. Specifically, the first electrode terminal may be connected to the negative electrode, and the second electrode terminal may be connected to the positive electrode. Unlike the protruding shape of the first electrode terminal, the remaining portion of the top plate except for the first electrode terminal may include a top plate portion made of a metal material as the second electrode terminal.

Meanwhile, the upper plate and the lower plate are both made of a metal material, but do not necessarily have to be made of the same metal material, and may each be independently made of a different metal material. Specifically, it may be made of at least one selected from the group consisting of aluminum, aluminum alloy, copper, copper alloy, nickel, nickel alloy, and stainless steel. By configuring each of the upper plate and the lower plate with a metal material, it is possible to secure safety when the battery is dropped and to prevent damage to the electrode terminal.

The top plate and the bottom plate may be joined in a state in which the outer periphery of the plate is welded to the end of the metal layer in the laminate sheet of the body, respectively, and the shape of the top plate may be a shape that matches the shape of the upper end of the end of the body of the hollow type have. The bottom plate is also manufactured in a shape that matches the shape of the lower end of the body, so that the shape of the finally manufactured battery case may be manufactured in the same shape as the shape of a general prismatic case made of a metal can.

On the other hand, in order to connect the upper plate and the lower plate to the body, the outer periphery of the plate made of metal may be welded to the end of the metal layer of the laminate sheet of the body. To this end, the upper and lower metal layers of the main body are not completely covered by the first resin layer and/or the second resin layer, but are formed to be exposed by a predetermined thickness so as to be welded with the upper plate and the lower plate. can

In one specific example, the laminate sheet may have a structure including a first resin layer forming an inner surface of the main body, and a metal layer forming an outer surface of the main body. Accordingly, in appearance, the metal layer is exposed as the outermost layer of the battery case body. In this case, since the insulation of the battery cell may be a problem, the structure may further include an insulating sheet on the outer surface of the metal layer.

On the other hand, in order to form a complete sealing structure at the connection portion between the main body and the upper plate or the lower plate, an auxiliary sealing member made of a resin material may be additionally included in the connection portion.

The present invention also provides a method for manufacturing the battery cell, specifically,

(a) preparing a body made of a laminate sheet including a resin layer and a metal layer;

(b) combining the main body and the lower plate;

(c) accommodating the electrode assembly in the hollow of the main body; and

(d) coupling the body and the top plate in which the electrode assembly is accommodated;

including,

The laminate sheet includes a first resin layer forming an inner surface of the main body, a second resin layer forming an outer surface of the main body, and a metal layer interposed between the first resin layer and the second resin layer is made of,

In step (b), the bottom plate may be coupled to the lower end of the laminate sheet metal layer as the main body, and in step (d), the top plate may be coupled to the upper end of the laminate sheet metal layer as the body.

That is, in the present invention, it is necessary to combine the main body and the lower plate, and the main body and the upper plate, which are separated from each other, and the process of combining them is absolutely necessary. Specifically, the combining process is made by a method by welding. can

The step of preparing the body with the laminate sheet may be accomplished by folding the laminate sheet into a prismatic shape and joining both ends to each other, or by bending the tubular body into a prismatic shape, or The body may have a cylindrical structure made of a tubular laminate sheet.

In addition, it is preferable that a portion of the laminate sheet coupled to the upper plate and the lower plate has a structure in which a metal layer is exposed for convenience of welding.

Specifically, in the case of manufacturing the battery case body with a laminate composed of the first resin layer, the metal layer and the second resin layer as described above, the area of the second resin layer is formed to be narrower than the area of the metal layer, The upper and lower portions are partially exposed, and the upper plate and the lower plate are coupled to the exposed metal layer.

Since the second resin layer is formed on the outside of the laminate sheet, insulation can be secured without adding a separate insulating member.

In another specific example, the laminate sheet has a structure including a first resin layer forming an inner surface of the main body, and a metal layer forming an outer surface of the main body, and after step (d), the main body It may further include the step (e) of adding an insulating sheet to the outer surface of the metal layer.

That is, since the laminate sheet has a structure in which the metal layer is exposed on the outer surface, a process of adding an insulating sheet to the outer surface of the metal layer may be required to secure insulation.

However, in the above case, in order to couple the upper plate and the lower plate to the metal layer, it is not necessary to manufacture a laminate sheet in which only a part of the metal layer is exposed, and since the weldable part is widened, the welding process is easy, and the welding heat is not affected. There is no risk of melting the resin layer on the outer surface of the metal layer.

Hereinafter, it will be described with reference to the drawings according to the following examples, but this is for easier understanding of the present invention, and the scope of the present invention is not limited thereto.

1 is an exploded perspective view of a battery case according to an embodiment of the present invention.

Referring to FIG. 1 , the battery case 100 includes a body 110 made of a laminate sheet, a bottom plate 120 , and a top plate 130 , and a negative terminal 131 is located at the center of the top plate 130 . has a protruding structure, and the top plate 130 excluding the negative terminal 131 serves as a positive terminal. An insulating member 132 is interposed to insulate the negative terminal 131 from the top plate 130 .

The body 110 may be formed by bending a tube-shaped laminate sheet to become a square shape, or by connecting both ends of a long sheet-type laminate sheet to form a tube shape and then bending to form a square shape.

However, the size and structure of the negative terminal 131 and the insulating member 132 shown in FIG. 1 are not particularly limited, and the top plate 130 and the electrode assembly (not shown) accommodated in the body 110 are Separate members may be added between the upper parts.

A downward extension part 133 is formed in the lower part of the upper plate 130, and an upward extension part 123 is formed in the upper part of the lower plate 120, and the downward extension part 133 and the upward extension part ( 123 may be positioned inside the main body 110 , and the ends of the main body may be coupled in a state where they are positioned on the outer surfaces of the downwardly extending part 133 and the upwardly extending part 123 .

However, the structure of the upper plate 130 and the lower plate 120, the shape of the coupling part with the body, and the coupling method are not particularly limited.

2 is a perspective view illustrating a state in which the upper plate and the electrode assembly of FIG. 1 are combined.

Referring to FIG. 2 , the electrode assembly 140 has a jelly-roll type structure, but the structure is not limited to a jelly-roll type, and a stack type, stack/folding type, or lamination/stack type electrode assembly may be used. is of course

The negative electrode tab 141 of the electrode assembly 140 is coupled to the lower surface of the negative terminal 131 of the top plate 130 , and the positive tab 142 is coupled to the remaining plane of the top plate except for the negative terminal 131 . .

3 is a partially enlarged view of the laminate sheet of FIG. 1 .

Referring to FIG. 3 , the laminate sheet 210 has a three-layer structure in which the first resin layer 212 is located on one side of the metal layer 211 and the second resin layer 213 is located on the other side. and the first resin layer 212 constitutes the inner surface of the battery case, and the second resin layer 213 constitutes the outer surface of the battery case. The laminate sheet 220 has a two-layer structure in which the first resin layer 222 is positioned on one side of the metal layer 221, and the first resin layer 222 constitutes the inner surface of the battery case, and the metal layer ( 221) constitutes the outer surface of the battery case.

The laminate sheet 210 is preferably formed such that the ends of the metal layer 211 are exposed for welding connection with the upper plate and the lower plate, and the inner surfaces of both ends of the laminate sheet 210 and the outer side of the upper and lower plates When the side surfaces are combined, the metal layer may be exposed at both ends of the first resin layer, which is the inner surface of the laminate sheet 210 , and the outer surfaces of both ends of the laminate sheet 210 and the inner surfaces of the upper and lower plates are combined. In this case, the metal layer may be exposed at both ends of the second resin layer, which is the outer surface of the laminate sheet 210 .

4 is a perspective view illustrating a battery cell manufacturing process.

Referring to FIG. 4 , a prismatic body 310 is formed by bending a laminate sheet, and a lower plate 320 is coupled to the lower portion of the body 310 to form a receiving unit capable of accommodating the electrode assembly 340 and the electrolyte. do.

Thereafter, the electrode assembly 340 is accommodated in the receiving unit, the electrode tabs of the electrode assembly 340 are coupled to the electrode terminals of the top plate 330 , and the top plate 330 is coupled to the upper portion of the body 310 . to seal the battery cell.

When the laminate body 310 has a structure in which a metal layer is exposed like the laminate sheet 220 of FIG. 3 , a process of adding an insulating sheet to the outer surface of the body 310 is additionally performed in order to secure the insulation of the battery cell. can

5 is a perspective view of a battery cell according to another embodiment.

Referring to FIG. 5 , the battery cell has the structure of a cylindrical battery cell in appearance, but has a structure corresponding to that of the battery case of FIG. 1 .

Specifically, the upper plate 430 is coupled to the upper portion of the body 410 made of a laminate sheet, and the lower plate 420 is coupled to the lower portion of the body 410, and the body 410 is the laminate sheet of FIG. 3 . As shown in 210 and 220, it may have a three-layer structure or a two-layer structure, and the protruding electrode terminal of the top plate 430 may serve as a negative terminal unlike a general cylindrical electrode assembly.

With respect to the specific configuration of the top plate, components other than the electrode terminal and the insulating member are not shown, but may have the same or similar shape as the top plate of a general prismatic battery cell, and in this regard, a prismatic battery widely known in the art Since the structure of the upper plate of the cell may be referred to, a detailed description thereof will be omitted.

Although the present invention has been described with reference to the accompanying drawings, it will be possible for those skilled in the art to make various applications and modifications within the scope of the present invention based on the above contents.

100: battery case
110, 310, 410: body
120, 320, 420: bottom plate
123: upward extension
130, 330, 430: top plate
131: negative terminal
132: insulation member
133: downward extension
140, 340: electrode assembly
141: negative tab
142: positive tab
210, 220: laminate sheet
211, 221: metal layer
212, 222: first resin layer
213: second resin layer

Claims (17)

A battery cell in which an electrode assembly including a positive electrode, a negative electrode, and a separator is embedded in a battery case together with an electrolyte, the battery case comprising:
a body comprising a laminate sheet including a resin layer and a metal layer, the upper and lower ends of which are open, respectively, and having a hollow structure in which an electrode assembly is embedded;
a top plate coupled to the open upper end of the main body, the first electrode terminal to which the first electrode of the electrode assembly is connected, and the second electrode terminal to which the second electrode is connected, made of a metal material; and
a lower plate coupled to the open lower end of the body and made of a metal material;
includes,
The laminate sheet is
i) a first resin layer forming an inner surface of the main body, a second resin layer forming an outer surface of the main body, and a structure including a metal layer interposed between the first resin layer and the second resin layer; ,
ii) a first resin layer forming an inner surface of the main body, and a metal layer forming an outer surface of the main body;
The thickness of the main body is a battery cell in the range of 50㎛ to 150㎛. The battery cell according to claim 1, wherein the electrode assembly has a jelly-roll type structure, a stack/folding type structure, or a lamination/stack type structure. delete The method according to claim 1, wherein when the laminate sheet is i),
The first resin layer and the second resin layer is a battery cell made of the same material. According to claim 1, wherein the main body is made of a structure in which both ends of the laminate sheet are folded into a square shape and joined to each other,
The upper plate and the lower plate is a battery cell made of a rectangular shape on a plane. According to claim 1, wherein the body is made of a structure in which a tubular laminate sheet is bent into a square shape,
The upper plate and the lower plate is a battery cell made of a rectangular shape on a plane. According to claim 1, wherein the main body has a cylindrical structure made of a tubular laminate sheet,
The top plate and the bottom plate are battery cells made of a circular or oval shape on a plane. The battery cell according to claim 1, wherein the material of the upper plate and the material of the lower plate are each independently selected from the group consisting of aluminum, aluminum alloy, copper, copper alloy, nickel, nickel alloy, and stainless steel. The battery cell according to claim 1, wherein the first electrode terminal of the top plate is connected to the negative electrode of the electrode assembly, and is formed to protrude upward from the center of the top plate. The battery cell according to claim 1, wherein the second electrode terminal of the top plate is connected to the positive electrode of the electrode assembly, and is formed on the remaining portion of the top plate except for the first electrode terminal. The battery cell according to claim 1, wherein the upper plate and the lower plate are welded to an end of the metal layer in the laminate sheet of the main body. delete The method according to claim 1, wherein when the laminate sheet is ii),
The battery cell further comprising an insulating sheet on the outer surface of the metal layer. delete The method according to claim 1, wherein when the laminate sheet is ii),
A battery cell in which an auxiliary sealing member made of a resin material is added to at least one of the connection portions between the main body and the upper plate and the lower plate. A method of manufacturing a battery cell according to any one of claims 1, 2, 4 to 11, 13, and 15,
(a) preparing a body made of a laminate sheet including a resin layer and a metal layer;
(b) combining the main body and the lower plate;
(c) accommodating the electrode assembly in the hollow of the main body; and
(d) coupling the body and the top plate in which the electrode assembly is accommodated;
including,
The laminate sheet includes a first resin layer forming an inner surface of the main body, a second resin layer forming an outer surface of the main body, and a metal layer interposed between the first resin layer and the second resin layer is made of,
In the steps (b) and (d), the top plate and the bottom plate are bonded to both ends of the laminate sheet metal layer,
The thickness of the main body is a battery cell manufacturing method in the range of 50㎛ to 150㎛. The method according to claim 16, wherein the laminate sheet has a structure including a first resin layer forming an inner surface of the main body, and a metal layer forming an outer surface of the main body,
After the step (d), the battery cell manufacturing method further comprising the step (e) of adding an insulating sheet to the outer surface of the metal layer of the body.

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