KR20230003728A - Battery cell, manufacturing method thereof - Google Patents

Abstract

A battery cell includes an electrode assembly and a pouch for accommodating the electrode assembly. The electrode assembly includes a plurality of electrodes and a sealing member that seals a gap between the plurality of electrodes and between the plurality of electrodes and the pouch. According to one aspect of the present invention, the sealing efficiency of the battery cell can be improved and the durability of the battery cell can be improved by improving the structure of the battery cell.

Description

Battery cell and its manufacturing method {BATTERY CELL, MANUFACTURING METHOD THEREOF}

The present invention relates to a battery cell and a manufacturing method thereof.

In general, a battery cell is used as an energy source for mobile devices, electric vehicles, hybrid vehicles, electricity, and the like, and may be used by changing its shape depending on the type of external device to which it is applied. Battery cells can be manufactured in various forms, but recently they have been manufactured in a flexible pouched type, so the shape is relatively free.

In general, a pouch-type battery cell may include a pouch, an electrode assembly disposed inside the pouch, and a tab portion connected to the electrode assembly. In order to connect the electrode assembly and the tab portion, a cutting operation to match the width of the uncoated portion of the electrode assembly to the width of the tab portion is required, and further, a welding operation is required to connect the two components. In this process, a bottleneck section occurs, which generates a large amount of heat and negatively affects the battery cell.

One aspect of the present invention provides a battery cell with improved structure and a method for manufacturing the battery cell.

One aspect of the present invention provides a battery cell with improved sealing structure and a method for manufacturing the battery cell.

One aspect of the present invention provides a battery cell with an improved connection structure.

A battery cell according to the spirit of the present invention includes an electrode assembly; and a pouch accommodating the electrode assembly, wherein the electrode assembly includes: a plurality of electrodes; and a sealing member sealing between the plurality of electrodes and between the plurality of electrodes and the pouch.

The pouch may include an opening formed on at least one side thereof, and the sealing member may be configured to seal the opening together with the plurality of electrodes disposed on the opening.

The sealing member may include a plurality of sealing layers respectively disposed on at least one surface of the plurality of electrodes.

The plurality of electrodes may include an active material portion on which an active material layer is formed, and an uncoated portion on which an active material layer is not formed, and the sealing layer may be disposed on the uncoated portion.

The plurality of sealing layers and the non-coated portions of the plurality of electrodes may be alternately disposed with each other.

The plurality of sealing layers may include a first layer disposed between uncoated portions of the plurality of electrodes; It may include; a second layer disposed on the outer surface of the non-coated portion of the outermost electrode among the plurality of electrodes.

The sealing layer may be disposed adjacent to the active material portion in the uncoated portion.

The sealing layer may be configured to be thicker than the thickness of the active material layer of the active material part.

The sealing member is a side sealing layer disposed along the stacking direction of the plurality of electrodes on the side surface of the plurality of electrodes, and a side sealing layer sealing between the side surface of the plurality of electrodes and the pouch. can

The side sealing layer may be disposed on a side of a portion where the plurality of sealing layers are disposed among uncoated portions of the plurality of electrodes.

The pouch may be configured to cover side surfaces of the electrode assembly on which the uncoated portions are not formed.

The pouch may be configured such that the active material parts of the plurality of electrodes are disposed therein.

The uncoated portion may include a first uncoated portion on which the sealing layer is disposed; and a second uncoated portion extending from the first uncoated portion, wherein the electrode assembly is a bundle of uncoated portions to which the second uncoated portions of the plurality of electrodes are connected, and is connected to a bus bar for electrical connection with an adjacent battery cell. It may include; a non-gap bundle configured to be coupled.

The first and second uncoated portions may have the same width in the width direction.

The non-uniform bundle may be configured to have the same width as the first non-uniform portion in the width direction.

The sealing member may be melted by heat to seal between the plurality of electrodes and between the plurality of electrodes and the pouch.

The sealing member may include at least one of a PP film and an adhesive.

A method of manufacturing a battery cell according to the spirit of the present invention includes an electrode assembly having a plurality of electrodes and a sealing layer respectively disposed on at least one surface of the plurality of electrodes, and placing a pouch so as to surround the circumference of the electrode assembly, , Sealing between the plurality of electrodes and between the plurality of electrodes and the pouch by the sealing layer.

The plurality of electrodes may include an active material portion on which an active material layer is formed, and an uncoated portion on which an active material layer is not formed, and the sealing layer may be disposed on the uncoated portion.

The sealing layer may be disposed adjacent to the active material portion in the uncoated portion.

The sealing layer may be configured to be thicker than the thickness of the active material layer of the active material part.

The electrode assembly may further include a side sealing layer disposed on a side surface of the plurality of electrodes along a stacking direction of the plurality of electrodes.

The side sealing layer may be disposed on a side of a portion where the plurality of sealing layers are disposed among uncoated portions of the plurality of electrodes.

The pouch may be disposed so as to cover a side surface of the electrode assembly on which the non-coated portions do not protrude.

The pouch may be disposed on the electrode assembly so that the active material parts of the plurality of electrodes are disposed therein.

According to one aspect of the present invention, the sealing efficiency of the battery cell may be improved and the durability of the battery cell may be improved by improving the structure of the battery cell.

According to one aspect of the present invention, by simplifying the manufacturing process of the battery cell, it is possible to minimize the defect of the battery cell, and further improve workability and economy.

According to one aspect of the present invention, it is possible to minimize the amount of heat generated by the battery cell and to improve the performance and efficiency of the battery cell.

1 is a perspective view of a battery cell according to an embodiment of the present invention;
2 is a view showing an electrode of a battery cell according to an embodiment of the present invention.
3 is a cross-sectional view of a battery cell according to an embodiment of the present invention.
4 is a cross-sectional view taken along line I-I' of FIG. 3;
5 to 7 are views of a method for manufacturing a battery cell and a battery module according to an embodiment of the present invention.

The embodiments described in this specification and the configurations shown in the drawings are only one preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings in this specification at the time of filing of the present application.

In addition, the same reference numerals or numerals presented in each drawing in this specification indicate parts or components that perform substantially the same function.

In addition, terms used in this specification are used to describe embodiments, and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It does not preclude in advance the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms including ordinal numbers such as “first” and “second” used herein may be used to describe various components, but the components are not limited by the terms, and the terms It is used only for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term "and/or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, terms such as "~ unit", "~ group", "~ block", "~ member", and "~ module" may mean a unit that processes at least one function or operation. For example, the terms may mean at least one hardware such as a field-programmable gate array (FPGA)/application specific integrated circuit (ASIC), at least one software stored in a memory, or at least one process processed by a processor. there is.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the contents of the above-described invention, so the present invention is described in such drawings should not be construed as limited to

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

The battery cell 1 may be formed in a pouch shape.

The battery cell 1 may include a pouch 10 and an electrode assembly 20 disposed inside the pouch 10 . The pouch 10 may also be defined as an exterior material. The electrode assembly 20 may include a plurality of electrodes 30 . A plurality of electrodes 30 may be formed by stacking or winding. The plurality of electrodes 30 may include an anode 30a and a cathode 30b, and a separator may be disposed between them.

The pouch 10 may be configured to accommodate the electrode assembly 20 . The pouch 10 may be configured to surround the electrode assembly 20 . In detail, the pouch 10 may be configured to cover four surfaces of the electrode assembly 20 on which the uncoated portion 34 is not formed. That is, the electrode assembly 20 may include a non-coated portion 34 protruding to at least one side, and the pouch 10 may be configured to cover surfaces on which the non-coated portion 34 does not protrude. The pouch 10 accommodates the electrode assembly 20 inside its body, and may be configured to seal the inside. Sealing of the pouch 10 may be performed by a sealing member 50 to be described later. In detail, the pouch 10 includes openings 11 and 12 (see FIG. 3) formed at at least one end, and on the openings 11 and 12, an uncoated portion 34 of the electrode assembly 20 to be described later, A sealing member 50 may be disposed.

2 is a view showing an electrode of a battery cell according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a battery cell according to an embodiment of the present invention.

The electrode 30 may include a current collector 31 and an active material layer 32 formed on at least one surface of the current collector 31 . The active material layer 32 may be formed by coating an active material on the current collector 31 . The electrode 30 may include an active material portion 33 in which the active material layer 32 is formed on at least one surface of the current collector 31 and an uncoated portion 34 in which the active material layer 32 is not formed.

In detail, the positive electrode 30a may include a positive electrode current collector and a positive electrode active material layer formed on at least one surface of the positive electrode current collector. The positive electrode 30a may include a positive electrode active material portion 33a having a positive electrode active material layer formed on at least one surface of the positive electrode current collector and a positive electrode uncoated portion 34a not having the positive electrode active material layer formed thereon. The negative electrode 30b may include a negative electrode current collector and an anode active material layer formed on at least one surface of the negative electrode current collector. The negative electrode 30b may include a negative electrode active material portion 33b in which an anode active material layer is formed on at least one surface of the negative electrode current collector and a negative electrode uncoated portion 34b in which the negative electrode active material layer is not formed.

The electrode assembly 20 may include a sealing member 50 .

The sealing member 50 may be configured to seal the battery cell 1 . The sealing member 50 may be configured to seal between the plurality of electrodes 30 and between the plurality of electrodes 30 and the pouch 10 . That is, the sealing member 50 may be configured to seal the openings 11 and 12 formed in the pouch 10 together with the plurality of electrodes 30 .

The sealing member 50 may be melted by heat to bond the components facing each other. That is, the sealing member 50 may be melted by heat to seal and adhere the pouch between the plurality of electrodes and between the plurality of electrodes. The sealing member 50 may be configured in the form of a film or may be configured in a band shape. The sealing member 50 may include at least one of a PP film and an adhesive.

The sealing member 50 may include a sealing layer 52 .

The sealing layer 52 may be configured to seal the plurality of electrodes 30 and the pouch 10 . A plurality of sealing layers 52 may be formed, and each may be disposed on at least one surface of the plurality of electrodes 30 . In this embodiment, as shown in FIGS. 2 and 6, it is shown that the sealing layer 52 is disposed on both sides of the electrode 30, respectively, but it may be configured on only one side. The sealing layer 52 may be configured to be stacked together with the plurality of electrodes 30 . The sealing layer 52 may seal the plurality of electrodes 30 and the plurality of electrodes 30 and the pouch 10 in the stacking direction of the plurality of electrodes 30 .

The sealing layer 52 may be disposed on the uncoated portion 34 of the electrode 30 . In detail, the sealing layer 52 may be disposed on the uncoated portion 34 adjacent to the active material portion 33 of the electrode 30 . The sealing layer 52 may be formed to be equal to or thicker than the thickness of the active material layer 32 in the active material portion 33 . That is, the sealing layer 52 may be configured such that the thickness of the uncoated portion 34 is equal to or thicker than that of the active material portion 33 . Of course, since the active material is formed on both sides of the current collector in the active material portion 33, when the sealing layer 52 is disposed on only one side of the uncoated portion 34, it may be configured to be twice as thick as or twice the thickness of the active material. there is. Through this, when the plurality of electrodes 30 are stacked, the thickness of the active material portion 33 prevents the sealing layer 52 from contacting the uncoated portion 34 or the sealing layer 52 facing each other. can

The uncoated portion 34 includes a first uncoated portion 35 sealed by the sealing layer 52 and a second uncoated portion 36 extending from the first uncoated portion 35 and exposed to the outside of the battery cell 1. ) may be included. The first uncoated portion 35 may be configured such that at least one surface is covered by the sealing layer 52, and at least a portion of the second uncoated portion 36 may form a bundle 38 of the uncoated portion 38 described below. . The first uncoated portion 35 may be defined as an uncoated sealing portion, and the second uncoated portion 36 may be defined as a bundle forming portion.

The width of the sealing layer 52 in the width direction may be the same as that of the uncoated portion 34 in the width direction of the electrode 30, as shown in FIGS. 4 and 5 to be described later. Through this, in the uncoated portion 34 of the electrode 30 to be stacked, the sealing layer 52 may be disposed in the entire width direction. However, it is not limited thereto, and the width of the sealing layer 52 in the width direction may be larger than that of the uncoated portion 34 . If the sealing layer 52 is configured to cover the whole area in the width direction with respect to the uncoated portion 34, this is satisfied.

In addition, the length of the sealing layer 52 may be arranged to cover at least a portion of the uncoated portion 34 in the longitudinal direction of the electrode 30 as shown in FIG. 2 . The width of the sealing layer 52 in the longitudinal direction may be configured to be constant in the width direction. Through this, the uncoated portions 34 of the stacked electrodes 30 may be constantly adhered or coupled to each other. The longitudinal direction may mean a direction in which the uncoated portion protrudes from the battery cell 1, and the width direction may mean a direction perpendicular to the longitudinal direction and the stacking direction of the plurality of electrodes 30.

FIG. 4 is a cross-sectional view taken along line I-I' of FIG. 3 . It will be described along with the previous drawings.

The plurality of stacked electrodes 30 may be alternately arranged with the plurality of sealing layers 52 . The sealing layer 52 includes a first layer 52i disposed between the uncoated portions 34 of the plurality of electrodes 30 and the uncoated portion 34 of the outermost electrode 30 among the plurality of electrodes 30. ) and a second layer 52j disposed between the pouch 10. The first layer 52i may seal between the uncoated portions 34 and the second layer 52j may seal between the uncoated portion 34 and the pouch 10 . The first and second layers 52i and 52j may be arranged along the stacking direction together with the plurality of electrodes 30 .

In the plurality of stacked electrodes 30, since the positive electrode 30a and the negative electrode 30b are alternately disposed at both ends of the battery cell 1, the uncoated portion 34 of the positive electrode 30a is one side of the battery cell 1. , and the uncoated portion 34 of the negative electrode 30b may be disposed on the other side of the battery cell 1.

The sealing layers 52 may include an anode sealing layer 52a and a cathode sealing layer 52b.

The anode sealing layer 52a may refer to the sealing layer 52 disposed on the plurality of anodes 30a. The positive electrode sealing layers 52a disposed on the plurality of positive electrodes may be configured to seal the uncoated portions 34a of the plurality of positive electrodes 30a and one end of the pouch 10 .

The cathode sealing layer 52b may refer to the sealing layer 52 disposed on the plurality of cathodes 30b. The negative electrode sealing layers 52b disposed on the plurality of negative electrodes 30b may be configured to seal the other end of the pouch 10 with the uncoated portions 34b of the plurality of negative electrodes 30b.

The positive electrode sealing layer 52a connects the uncoated portions 34a of the plurality of positive electrodes 30a, and is configured to seal the inside thereof, so that the end portion of the active material portion 33b of the negative electrode 30b can be sealed. In addition, the negative electrode sealing layer 52b connects the non-coated portions 34b of the plurality of negative electrodes 30b, and is configured to seal the inside thereof, so that the end portion of the active material portion 33a of the positive electrode 30a can be sealed. Through this, the sealing layer 52 can perform coupling between the electrodes 30 and sealing of the battery cell 1 at the same time.

The sealing member 50 may include a side sealing layer 54 .

The side sealing layer 54 may be disposed between the sides of the plurality of electrodes 30 and the pouch 10 to seal the plurality of electrodes 30 and the pouch 10 . The side sealing layer 54 may be disposed along the stacking direction of the plurality of electrodes 30 on the sides of the uncoated portions 34 of the stacked electrodes 30 . In detail, the side sealing layer 54 is configured to cover the sealing laminated surface 56 (see FIGS. 1 and 4), which is the side of the portion where the sealing layer 52 is disposed in the uncoated portion 34 of the stacked electrodes 30. It can be.

The side sealing layer 54 may be disposed on the side of the sealing layer 52 . That is, the sealing layer 52 may be disposed on at least one surface of the uncoated portion 34 of the electrodes 30 and the side sealing layer 54 may be disposed on a side portion of the uncoated portion 34 of the electrodes 30 . In detail, a sealing layer 52 may be disposed on at least one surface of the first uncoated portion 35 and a side sealing layer 54 may be disposed on an end portion of the first uncoated portion 35 in the width direction.

The longitudinal width of the side sealing layer 54 may be configured to correspond to that of the sealing layer 52 in the longitudinal direction. Preferably, the width of the side sealing layer 54 in the longitudinal direction may be the same as that of the sealing layer 52 in the longitudinal direction. Through this, the first uncoated portion 35 of the uncoated portion 34 together with the sealing layer 52 can be sealed against the pouch 10, and stable sealing between the electrodes 30 and the pouch 10 is achieved. It becomes possible.

The sealing layer 52 seals the plurality of electrodes 30 and the pouch 10 in the stacking direction, and the side sealing layer 54 seals the plurality of electrodes 30 and the pouch 10 in the stacking direction. It can be configured to seal in the vertical width direction. Through this configuration, it is possible to seal between the plurality of electrodes 30 and between the plurality of electrodes 30 and the pouch 10 . The sealing layer 52 and the side sealing layer 54 may be defined as a first sealing layer 52 and a second sealing layer 52 . In this embodiment, the sealing member 50 is divided into a sealing layer 52 and a side sealing layer 54, but is not limited thereto.

For example, the sealing layer 52 may be formed to be longer than the width of the uncoated portion 34 so as to protrude from the side of the uncoated portion 34 so that the protruding portion is located on the side of the uncoated portion 34 . In this case, the sealing layer 52 may include a first sealing layer disposed on at least one surface of the uncoated portion 34 and a second sealing layer extending from the first sealing layer 52 to the side of the uncoated portion 34. there is. That is, in this embodiment, the first sealing layer is the sealing layer 52 of FIG. 4, and the second sealing layer extends from the first sealing layer to form a sealing stacking surface 56 like the side sealing layer 54 of FIG. ) may be configured to be bent from the first sealing layer so as to wrap.

The battery cell 1 may include a pouch 10 .

The pouch 10 may be configured to cover the plurality of stacked electrodes 30 . In detail, the pouch 10 may be configured to surround surfaces of the electrode assembly 20 on which the uncoated portion 34 is not formed. Through this, the pouch 10 may be configured such that the active material parts 33 of the plurality of electrodes 30 are disposed therein. Since the pouch 10 is configured to surround the electrode assembly 20, a separate forming process for accommodating the electrode assembly 20 can be omitted.

The pouch 10 is configured to cover at least a portion of the positive sealing layer 52a and the negative sealing layer 52b and may have a substantially annular shape. The length and width of the pouch 10 are not limited, and are satisfied as long as one end covers at least a portion of the positive sealing layer 52a and the other end covers at least a portion of the negative sealing layer 52b.

The pouch 10 may include a first opening 11 at one end and a second opening 12 at the other end. The positive sealing layers 52a and the positive uncoated regions 34 are disposed in the first opening 11, and the negative sealing layers 52b and the negative uncoated regions 34 are disposed in the second opening 12. can be placed. The first and second openings 11 and 12 are the uncoated portions 34a of the positive electrode 30a and the positive sealing layers 52a, and the uncoated portions 34b of the negative electrode 30b and the negative sealing layer 52b, respectively. It can be sealed by being sealed.

The electrode assembly 20 may include a bundle of uncoated parts 38 (see FIG. 7).

The uncoated portion bundle 38 may be formed at the ends of the uncoated portions 34 in the plurality of electrodes 30 . The uncoated portion bundle 38 may be configured to be coupled with the bus bar 60 electrically connected to the non-coated portion bundle 38 of the adjacent battery cell 1 . The uncoated region bundle 38 may be formed by stacking at least a part of the second uncoated region 36 among the plurality of electrodes 30 . That is, the uncoated portion bundle 38 may be formed by connecting the second uncoated portion 36 extending from the first uncoated portion 35 covered by the sealing layer 52 in the plurality of electrodes 30 . The uncoated region bundle 38 may be formed by joining the second uncoated regions 36 through ultrasonic bonding. However, the connection method between the second uncoated portions 36 forming the uncoated portion bundle 38 is not limited. For example, the uncoated bundle 38 may be stacked without bonding, and it satisfies this if configured to be connected to a bus bar for electrical connection with an adjacent battery cell.

In the plurality of electrodes 30, the first uncoated portion 35 and the second uncoated portion 36 may have the same width. Also, in the plurality of electrodes 30, the first uncoated portion 35 and the uncoated portion bundle 38 formed by the second uncoated portion 36 may have the same width. Also, the first uncoated portion 35 and the uncoated portion bundle 38 may have the same width as the active material portion 33 . That is, in the present embodiment, the plurality of electrodes 30 may omit separate widthwise cutting for connecting seals and tabs, so that the widths of the components forming the plurality of electrodes 30 may be the same. . Through this configuration, it is possible to prevent generation of a bottleneck section in the plurality of electrodes 30, thereby preventing an increase in resistance and heat generation in the bottleneck section.

Hereinafter, a method of manufacturing a battery cell and a battery module according to the above configuration will be described.

5 to 7 are diagrams related to a method of manufacturing a battery cell and a battery module according to an embodiment of the present invention.

As shown in FIG. 5 , a sealing layer 52 may be disposed on at least one surface of the electrode 30 . The sealing layer 52 may be disposed on the uncoated portion 34 of the electrode 30 , and in detail, may be disposed on the uncoated portion 34 adjacent to the active material portion 33 .

The electrode 30 on which the sealing layer 52 is disposed may be cut to fit the required size of the electrode 30 . However, the cutting process may be omitted by forming the electrode 30 itself to a required size.

The side sealing layer 54 may be disposed to surround the side of the electrode assembly 20 . The side sealing layer 54 may be disposed on the same line as the sealing layer 52 in the longitudinal direction of the plurality of electrodes 30 . That is, the side sealing layer 54 may be disposed on the side of the portion where the sealing layer 52 is located in the plurality of electrodes 30 . That is, the side sealing layer 54 may be configured to surround the sealing laminated surface 56 .

The electrode assembly 20 in which the plurality of electrodes 30 on which the sealing member 50 is disposed is stacked, and the pouch 10 may be disposed to surround the circumference of the electrode assembly 20 . The pouch 10 may be configured such that its body surrounds the active material parts 33 of the electrodes 30 of the electrode assembly 20 . Also, the pouch 10 may be disposed such that an end thereof covers at least a portion of the sealing layer 52 of the electrode assembly 20 . Of course, the end of the pouch 10 may be arranged to cover all of the sealing layer 52 . That is, the opening formed by the pouch 10 may be disposed to cover the end of the sealing layer 52 on the side of the second uncoated portion 36 .

As shown in FIG. 6 , the plurality of electrodes 30 and the pouch 10 may be sealed by melting the sealing layer 52 or the sealing layer 52 and the side sealing layer 54 . In detail, by applying heat to the sealing member 50 in the B direction to melt the sealing member 50, the plurality of electrodes 30 and the pouch 10 may be sealed. For close contact between the components during the melting process, the openings 11 and 12 of the pouch 10 or a portion adjacent to the openings 11 and 12 may be pressed in the A direction.

Through this process, as shown in FIG. 3 above, the sealing layer 52 can seal between the plurality of electrodes 30 and between the outermost electrode 30 and the pouch 10, and the side sealing layer 54 has a plurality of The sides of the electrodes 30 and the pouch 10 may be sealed. The battery cell 1 may be manufactured through such a process.

Also, as shown in FIG. 7 , the protruding second non-coated portions 36 may form a non-coated portion bundle 38 . The battery cell 1 may be defined before the uncoated portion bundle 38 is formed, and the battery cell 1 may be defined after the uncoated portion bundle 38 is formed. The definition of the battery cell 1 is not limited thereto. The uncoated part bundle 38 may be coupled to the bus bar 60 in a mutually bonded state, or the non-coated part bundle 38 itself may be coupled to the bus bar 60. Through such a process, a plurality of battery cells 1 may be electrically connected, and a plurality of battery cells 1 may be electrically connected to each other to implement a battery module 70 . In FIG. 7, it is shown that the uncoated portion bundle 38 is interposed in the space formed by the pair of bus bars 60 to be electrically connected to the bus bars 60, but is not limited thereto. For example, by forming a hole corresponding to the width and thickness of the uncoated portion bundle 38 in the plate-shaped bus bar 60, and inserting and bonding the uncoated portion bundle 38 to the hole, the bus bar 60 and the electrical may be connected to

In the above, specific embodiments have been illustrated and described. However, it is not limited to the above embodiments, and those skilled in the art will be able to make various changes without departing from the gist of the technical idea of the invention described in the claims below. .

1: battery cell 10: pouch
20: electrode assembly 30: electrode
30a: anode 30b: cathode
33: active material part 34: plain part
35: first uncoated portion 36: second uncoated portion
38: Uncoated part bundle 50: Sealing member
52: sealing layer 54: side sealing layer
56: sealing laminated surface 60: bus bar
70: battery module

Claims (25)

electrode assembly;
Including; a pouch accommodating the electrode assembly,
The electrode assembly,
a plurality of electrodes;
A battery cell comprising: a sealing member sealing between the plurality of electrodes and between the plurality of electrodes and the pouch. According to claim 1,
The pouch,
Including an opening formed on at least one side,
The sealing member,
A battery cell configured to seal the opening together with the plurality of electrodes disposed on the opening. According to claim 1,
The sealing member,
A battery cell comprising: a plurality of sealing layers respectively disposed on at least one surface of the plurality of electrodes. According to claim 3,
The plurality of electrodes,
It includes an active material portion on which an active material layer is formed and an uncoated portion on which an active material layer is not formed,
The sealing layer,
A battery cell disposed in the uncoated portion. According to claim 4,
Uncoated portions of the plurality of sealing layers and the plurality of electrodes,
Battery cells arranged alternately with each other. According to claim 4,
The plurality of sealing layers,
a first layer disposed between the non-coated portions of the plurality of electrodes;
A battery cell comprising a; second layer disposed on the outer surface of the non-coated portion of the outermost electrode among the plurality of electrodes. According to claim 4,
The sealing layer,
A battery cell disposed adjacent to the active material portion in the uncoated portion. According to claim 4,
The sealing layer,
A battery cell configured to be thicker than the thickness of the active material layer of the active material part. According to claim 4,
The sealing member,
A battery cell further comprising: a side sealing layer disposed on a side surface of the plurality of electrodes along a stacking direction of the plurality of electrodes, and sealing between the side surface of the plurality of electrodes and the pouch. According to claim 9,
The side sealing layer,
A battery cell disposed on a side of a portion where the plurality of sealing layers are disposed among uncoated portions of the plurality of electrodes. According to claim 4,
The pouch,
A battery cell configured to surround side surfaces on which the non-coated portions are not formed in the electrode assembly. According to claim 11,
The pouch,
A battery cell configured such that the active material portions of the plurality of electrodes are disposed therein. According to claim 4,
The blank part,
a first uncoated portion where the sealing layer is disposed;
And a second uncoated portion extending from the first uncoated portion,
The electrode assembly,
A battery cell comprising: a bundle of uncoated portions to which the second uncoated portions of the plurality of electrodes are connected, and configured to be coupled to a bus bar for electrical connection with an adjacent battery cell. According to claim 13,
The first and second uncoated portions are configured to have the same width in the width direction. According to claim 13,
The bundle of mucous membranes,
A battery cell configured to have the same width as the first uncoated portion in the width direction. According to claim 1,
The sealing member,
A battery cell that is melted by heat to seal between the plurality of electrodes and between the plurality of electrodes and the pouch. According to claim 1,
The sealing member,
A battery cell comprising at least one of a PP film and an adhesive. An electrode assembly having a plurality of electrodes and a sealing layer respectively disposed on at least one surface of the plurality of electrodes,
Disposing a pouch so as to surround the circumference of the electrode assembly,
A method of manufacturing a battery cell for sealing between the plurality of electrodes and between the plurality of electrodes and the pouch by the sealing layer. According to claim 18,
The plurality of electrodes,
It includes an active material portion on which an active material layer is formed and an uncoated portion on which an active material layer is not formed,
The sealing layer,
A method of manufacturing a battery cell disposed in the uncoated portion. According to claim 19,
The sealing layer,
A method of manufacturing a battery cell disposed adjacent to the active material portion in the uncoated portion. According to claim 19,
The sealing layer,
The method of manufacturing a battery cell configured to be thicker than the thickness of the active material layer of the active material portion. According to claim 19,
The electrode assembly,
The method of manufacturing a battery cell further comprising a; side sealing layer disposed along the stacking direction of the plurality of electrodes on the side of the plurality of electrodes. 23. The method of claim 22,
The side sealing layer,
A method of manufacturing a battery cell disposed on a side of a portion where the plurality of sealing layers are disposed among uncoated portions of the plurality of electrodes. According to claim 19,
The arrangement of the pouch,
A method of manufacturing a battery cell in which the non-coated portions are arranged to surround non-protruding side surfaces of the electrode assembly. 25. The method of claim 24,
The pouch,
A method of manufacturing a battery cell disposed in the electrode assembly so that the active material parts of the plurality of electrodes are disposed therein.

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