KR20210049471A - Apparatus for stacking battery cell, method for stacking battery cell and battery module - Google Patents

Abstract

The present invention relates to a battery cell stacking device and a battery cell stacking method. The battery cell stacking device according to an embodiment of the present invention includes: a transport member for transporting battery cells; a plate on which a battery cell stack formed by stacking a plurality of the battery cells along a vertical Z-axis is mounted; a cell stack guide bar positioned on one side of the plate to support the same side of the battery cells when stacking the plurality of battery cells; and an alignment member positioned on the other side of the plate and moving along a horizontal X-axis and the Z-axis. The transport member includes a holding unit for mounting the battery cells on the plate by moving the battery cells along the Z-axis.

Description

Battery cell stacking device, battery cell stacking method, and battery module {APPARATUS FOR STACKING BATTERY CELL, METHOD FOR STACKING BATTERY CELL AND BATTERY MODULE}

The present invention relates to a battery cell stacking device, a battery cell stacking method, and a battery module, and more specifically, to a battery cell stacking device, a battery cell stacking method, and a battery module for stably stacking battery cells.

Secondary batteries having high ease of application according to product groups and having electrical characteristics such as high energy density are commonly applied to electric vehicles or hybrid vehicles driven by electric drive sources, power storage devices, as well as portable devices. These secondary batteries are attracting attention as a new energy source for eco-friendliness and energy efficiency improvement in that they do not generate any by-products from the use of energy as well as the primary advantage of being able to drastically reduce the use of fossil fuels.

While one or two or three battery cells per device are used in small mobile devices, high-power and large-capacity devices are required for medium-sized devices such as automobiles. Therefore, a medium or large-sized battery module in which a plurality of battery cells are electrically connected is used.

Since the medium and large-sized battery modules are preferably manufactured with a small size and weight as much as possible, prismatic batteries and pouch-type batteries that can be stacked with a high degree of integration and have a small weight to capacity are mainly used as battery cells of medium-sized battery modules. On the other hand, the battery module, in order to protect the cell stack from external shock, heat, or vibration, the front and rear surfaces may be opened to include a frame member for accommodating the battery cell stack in the inner space.

1 is a schematic diagram showing a method of laminating a conventional battery cell stack.

Referring to FIG. 1, in order to stack a plurality of battery cells 10, battery cells 10 are sequentially mounted on a plate 20 in a vertical direction. In this case, the plurality of battery cells 10 may be sequentially aligned on the plate 20 based on the cell stack guide bar 30. However, due to the shape of the edge of the battery cell 10, the battery cell 10 may slide or twist when the battery cells 10 are stacked.

When such a phenomenon occurs, the flatness of the subsequently manufactured battery module becomes poor, and the amount of resin injected between the frame and the outermost battery cell varies for each battery module, causing difficulty in process control. In addition, the area of the double-sided tape attached between the battery cells is not constant.

An object to be solved by the present invention is to provide a battery cell stacking apparatus for stably stacking battery cells, a battery cell stacking method, and a battery module manufactured therefrom.

However, the problems to be solved by the embodiments of the present invention are not limited to the above-described problems and may be variously expanded within the scope of the technical idea included in the present invention.

A battery cell stacking apparatus according to an embodiment of the present invention includes a transfer member for transporting battery cells, a plate on which a battery cell stack formed by stacking a plurality of battery cells along a vertical Z-axis is mounted, and is located at one side of the plate. A cell stack guide bar supporting the same side of the battery cells when the plurality of battery cells are stacked, and an alignment member positioned on the other side of the plate and moving along the horizontal X-axis and the Z-axis, the The transfer member includes a holding part that moves the battery cell along the Z axis and mounts it on the plate.

The alignment member may press the battery cells in the X-axis direction so that the battery cells are in close contact with the cell stack guide bar.

The alignment member includes a push portion in contact with one surface of the battery cell at an end of the alignment member, and a length of the push portion in the Z-axis direction is equal to or longer than the length in the Z-axis direction of the one surface of the battery cell. I can.

The position of the push unit may be controlled to correspond to the first battery cell among first and second battery cells sequentially stacked on the plate.

At least two alignment members may be formed along the Y-axis direction of the battery cell.

The push unit may reciprocate along the X axis by a cylinder.

The holding part may be a vacuum adsorption method.

A battery cell stacking method according to another embodiment of the present invention includes stacking a first battery cell on a plate along a vertical Z axis, and a second battery cell based on a cell stack guide bar positioned at one side of the plate. Stacking on the first battery cell in the Z-axis direction, and the stacking of the second battery cell may include a second battery located on the opposite side from one side of the first battery cell adjacent to the cell stack guide bar. It is performed while supporting one side in the X-axis direction.

An alignment member positioned adjacent to the other side of the first battery cell is used to support the other side of the first battery cell in the X-axis direction, and the alignment member moves the first battery cell in the X-axis direction. The first battery cell may be pressed in close contact with the cell stack guide bar.

The alignment members may be positioned at both ends of the first battery cell along the Y-axis direction of the first battery cell, and the two alignment members may simultaneously support the first battery cell.

The stacking of the second battery cells may include positioning the alignment member to move in the Z-axis direction to correspond to the first battery cell, and a push portion formed at an end of the alignment member along the X-axis direction. It may include the step of pressing the first battery cell.

The level of the shift in the X-axis direction of the first battery cell and the second battery cell may be 0.7 mm or less.

A battery module according to another embodiment of the present invention includes a battery cell stack in which a plurality of battery cells are stacked, a U-shaped frame having an open top and receiving the battery cell stack, and an upper portion of the opened U-shaped frame. And an upper plate covering the battery cell stack, wherein the U-shaped frame includes a bottom portion and two side surfaces facing each other, and a level shifted in the horizontal direction of the battery cells included in the battery cell stack is 0.7 It is less than a millimeter.

The bottom portion includes a first portion and a second portion, the first portion is located at an edge with respect to the length direction of the battery cell, the second portion is located inside the first portion, the first portion The thickness of may be thinner than the thickness of the second portion.

The battery module further includes a bus bar frame connected to the battery cell stack, and the U-shaped frame has both sides facing each other open based on a direction in which the electrode leads of the battery cell stack protrude, and the U On both open sides of the shaped frame, the bus bar frame is connected to the battery cell stack, and the bus bar frame is a main frame disposed perpendicular to a direction in which the electrode leads protrude, and a bent extending from a lower portion of the main frame. May contain wealth.

The battery cell may include a protrusion formed in a width direction, and the protrusion may be located on the bent part.

According to embodiments, when forming a battery cell stack by stacking battery cells in a vertical direction, the cell stack is performed by stacking the next battery cells while supporting the first stacked battery cells in the horizontal direction in addition to the cell stack guide bar. The deviation can be reduced.

1 is a schematic diagram showing a method of laminating a conventional battery cell stack.
2 is a perspective view showing a battery cell stacking apparatus according to an embodiment of the present invention.
3 is a front view of the battery cell stacking apparatus of FIG. 2 as viewed along the Y-axis direction.
4 is a perspective view of the battery cell stacking apparatus of FIG. 2 viewed from a different angle.
5 is an exploded perspective view showing a battery module according to another embodiment of the present invention.
6 is a perspective view illustrating a state in which components of the battery module of FIG. 5 are combined.
7 is a perspective view showing one battery cell included in the battery cell stack of FIG. 5.
8 is a schematic cross-sectional view illustrating a battery cell stack included in the battery module of FIG. 5.
9 is a perspective view illustrating a bus bar frame in the battery module of FIG. 5.
10 is a cross-sectional view taken along the XZ plane in the longitudinal direction of the battery cell stack in FIG. 6.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are attached to the same or similar components throughout the specification.

In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, so the present invention is not necessarily limited to the illustrated bar. In the drawings, the thicknesses are enlarged in order to clearly express various layers and regions. In addition, in the drawings, for convenience of description, the thicknesses of some layers and regions are exaggerated.

In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" or "on" another part, this includes not only the case where the other part is "directly above", but also the case where there is another part in the middle. . Conversely, when one part is "directly above" another part, it means that there is no other part in the middle. In addition, to be "on" or "on" the reference part means that it is located above or below the reference part, and means that it is located "above" or "on" in the direction opposite to the gravitational force. no.

In addition, throughout the specification, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

In addition, throughout the specification, the term "on a plane" means when the object portion is viewed from above, and when the object portion is viewed from above, it means when the object portion is viewed from the side when a vertically cut cross-section is viewed from the side.

2 is a perspective view showing a battery cell stacking apparatus according to an embodiment of the present invention. 3 is a front view of the battery cell stacking apparatus of FIG. 2 as viewed along the Y-axis direction.

2 and 3, the battery cell stacking apparatus according to the present embodiment includes a transfer member 530 for transporting the battery cells 110, and a battery formed by stacking a plurality of battery cells 110 along the Z-axis in the vertical direction. A plate 510 on which the cell stack 120 is mounted, a cell stack guide bar 520 positioned on one side of the plate 510 to support the same one side of the battery cells 110 when a plurality of battery cells 110 are stacked ), and an alignment member 550 located on the other side of the plate 510 and moving along the horizontal X-axis and the Z-axis.

The transfer member 530 may include a holding part 540 that moves the battery cell 110 along the Z axis and mounts it on the plate 510. The holding unit 540 may be moved by adsorbing the upper surface of the battery cell 110 at a preset vacuum value in consideration of the weight and size of the battery cell 110 in a vacuum adsorption method.

The alignment member 550 according to the present embodiment may press the battery cell 110 in the X-axis direction so that the battery cell 110 is in close contact with the cell stack guide bar 520. The alignment member 550 includes a push portion 560 in contact with one surface of the battery cell 110 at an end of the alignment member 550. At this time, it is preferable that the length of the push part 560 in the Z-axis direction is equal to or longer than the length of the one surface of the battery cell 110 in the Z-axis direction. If the length of the push part 560 in the Z-axis direction is shorter than the length in the Z-axis direction of one side of the battery cell 110, the force transmitted from the push part 560 to the battery cell 110 is not constant, which is expected. The effect of reducing misalignment may be reduced.

The push unit 560 according to the present embodiment may reciprocate along the X axis by a cylinder method. The cylinder method may be a hydraulic method or a pneumatic method.

As will be described later, in the battery cell stacking method according to another embodiment of the present invention, the position of the push unit 560 is a first battery cell 110a and a second battery cell that are sequentially stacked on the plate 510 ( 110b) may be controlled to correspond to the first battery cell 110a.

4 is a perspective view of the battery cell stacking apparatus of FIG. 2 viewed from a different angle.

At least two alignment members 550 according to the present embodiment may be formed along the Y-axis direction of the battery cell 110. Referring to FIG. 4, the alignment member 550 may include a first alignment member 550a and a second alignment member 550b. The first alignment member 550a and the second alignment member 550b may be positioned adjacent to both ends in the Y-axis direction on the plate 510 on which the battery cells 110 are stacked. The first alignment member 550a and the second alignment member 550b may be positioned at the same distance from the center of the plate 510 based on the Y-axis direction. By this position design, the force transmitted from the push unit 560 to one surface of the battery cell 110 in the Y-axis direction may be uniform. Therefore, it is possible to reduce the stacking variation between battery cells after alignment.

Hereinafter, a battery module according to another embodiment of the present invention will be described with reference to FIGS. 5 to 10.

5 is an exploded perspective view showing a battery module according to another embodiment of the present invention. 6 is a perspective view illustrating a state in which components of the battery module of FIG. 5 are combined. 7 is a perspective view showing one battery cell included in the battery cell stack of FIG. 5.

5 and 6, the battery module 100 according to the present embodiment includes a battery cell stack 120 including a plurality of battery cells 110, a U-shaped frame with open top, front and rear surfaces. (300), an upper plate 400 covering an upper portion of the battery cell stack 120, an end plate 150 and a battery cell stack 120 positioned at the front and rear surfaces of the battery cell stack 120, respectively, and It includes a bus bar frame 130 positioned between the end plates 150.

When both open sides of the U-shaped frame 300 are referred to as a first side and a second side, respectively, the U-shaped frame 300 includes the battery cell stack 120 corresponding to the first side and the second side. It consists of a plate-shaped structure bent so as to continuously surround the front, lower and rear surfaces adjacent to each other among the remaining outer surfaces except for the surface. The upper surface corresponding to the lower surface of the U-shaped frame 300 is open.

The upper plate 400 has a single plate-shaped structure that surrounds the rest of the upper surface excluding the front, lower and rear surfaces that are wrapped by the U-shaped frame 300. The U-shaped frame 300 and the upper plate 400 may form a structure surrounding the battery cell stack 120 by being coupled by welding or the like in a state in which the corresponding corner portions are in contact with each other. That is, the U-shaped frame 300 and the upper plate 400 may have a coupling portion CP formed at an edge portion corresponding to each other by a coupling method such as welding.

The battery cell stack 120 includes a plurality of battery cells 110 stacked in one direction, and the plurality of battery cells 110 may be stacked in the Z-axis direction as shown in FIG. 5. The battery cell 110 is preferably a pouch-type battery cell. For example, referring to FIG. 7, in the battery cell 110 according to the present embodiment, two electrode leads 111 and 112 face each other so that one end 114a of the battery body 113 and the other end 114b Each has a structure protruding from ). The battery cell 110 is manufactured by bonding both ends 114a and 114b of the case 114 and both side surfaces 114c connecting them in a state in which the electrode assembly (not shown) is accommodated in the battery case 114. I can. In other words, the battery cell 110 according to the present embodiment has a total of three sealing parts (114sa, 114sb, 114sc), the sealing parts (114sa, 114sb, 114sc) is a structure that is sealed by a method such as thermal fusion. , The other side portion may be formed of the connection portion 115. The distance between both ends 114a and 114b of the battery case 114 is defined in the length direction of the battery cell 110, and a connection part with one side 114c connecting both ends 114a and 114b of the battery case 114 Between 115 may be defined in the width direction of the battery cell 110.

The connection part 115 is an area extending long along one edge of the battery cell 110, and a protrusion 110p of the battery cell 110 may be formed at an end of the connection part 115. The protrusion 110p may be formed on at least one of both ends of the connection part 115, and may protrude in a direction perpendicular to a direction in which the connection part 115 extends. The protrusion 110p may be positioned between one of the sealing portions 114sa and 114sb of both ends 114a and 114b of the battery case 114 and the connection portion 115.

The battery case 114 is generally made of a laminate structure of a resin layer/metal thin film layer/resin layer. For example, when the surface of the battery case is made of an O (oriented)-nylon layer, when a plurality of battery cells are stacked to form a medium or large battery module, they tend to slide easily due to external impact. Therefore, in order to prevent this and maintain a stable stacked structure of battery cells, a battery cell stacked body by attaching an adhesive member such as an adhesive adhesive such as a double-sided tape or a chemical adhesive bonded by a chemical reaction upon adhesion to the surface of the battery case. 120 can be formed. In this embodiment, the battery cell stack 120 is stacked in the Z-axis direction, is accommodated in the U-shaped frame 300 in the X-axis direction, and cooled by a thermally conductive resin layer to be described later. As a comparative example of this, there is a case in which the battery cells are formed of cartridge-shaped parts, and the fixing between the battery cells is made by assembling the battery module frame. In this comparative example, due to the presence of cartridge-type components, there is little or no cooling action, and cooling may be performed in the direction of the surface of the battery cell, and cooling is not performed well in the height direction of the battery module.

Referring again to FIGS. 5 and 6, the widths of the side portion 300b and the upper plate 400 of the U-shaped frame 300 according to the present embodiment may be the same. In other words, the edge portion along the Y-axis direction of the upper plate 400 and the edge portion along the Y-axis direction of the side portion 300b of the U-shaped frame 300 may directly meet and be coupled by a method such as welding.

8 is a schematic cross-sectional view illustrating a battery cell stack included in the battery module of FIG. 5.

Referring to FIG. 8, a level d shifted in the horizontal direction (X axis) of the battery cells 110 included in the battery cell stack 120 according to the present embodiment may be approximately 0.7 mm or less. The measurement error may be approximately ±0.05 millimeters. This numerical range is the next battery cell in a state in which the battery cells 110a stacked first in the horizontal direction in addition to the cell stack guide bar 520 of FIG. 3 are supported in the battery cell stacking method according to another embodiment of the present invention to be described later. By stacking (110b), it may be a result of reducing cell stack variation.

9 is a perspective view illustrating a bus bar frame in the battery module of FIG. 5.

Referring to FIG. 9, the bus bar frame 130 according to the present embodiment includes a main frame 130a disposed perpendicular to a direction in which the electrode leads 111 and 112 described in FIG. 7 protrude, and a main frame 130a. It includes a bent portion (130b) extending from the lower portion of the. The bus bar frame 130 is connected to the battery cell stack 120 as described in FIGS. 2 and 3. In the main frame 130a, the electrode lead may pass through the slit to form a structure in which the electrode lead is coupled to the bus bar. The bent portion 130b may be bent at approximately 90 degrees with respect to the main frame 130a and may be positioned on the bottom portion 300a of the U-shaped frame 300. The bent portion 130b and the surrounding configuration will be further described with reference to FIG. 10.

10 is a cross-sectional view taken along the XZ plane in the longitudinal direction of the battery cell stack in FIG. 6.

Referring to FIG. 10, the battery cell 110 according to the present embodiment includes a protrusion 110p formed in the width direction, and the protrusion 110p is positioned on the bent portion 130b. Here, the width direction of the battery cell 110 may be the X-axis direction of FIG. 10. The bottom portion 300a of the U-shaped frame according to the present embodiment includes a first portion 300a1 and a second portion 300a2, and the first portion 300a1 is based on the length direction of the battery cell 110. Located at the edge, the second part 300a2 is located inside the first part 300a1. In this case, it is preferable that the thickness of the first portion 300a1 is thinner than that of the second portion 300a2. Here, the length direction of the battery cell 110 may be the Y-axis direction of FIG. 10.

9 and 10, in this embodiment, the bent portion 130b of the bus bar frame 130 is located in the first portion 300a1 of the bottom portion 300a of the U-shaped frame. In this case, the combined thickness of the bent portion 130b and the thickness of the first portion 300a1 is preferably thinner than the thickness of the second portion 300a2. This is because the protrusion 110p of the battery cell 110 can be prevented from flowing due to an external shock by being caught by a step between the first portion 300a1 and the second portion 300a2. In addition, it is possible to reduce the gap between the battery cell 110 and the frame through the processing of the U-shaped frame bottom part 300a, and this gap reduction effect is a gap reduction effect and synergy that can be obtained through assembly in the height direction. To maximize the overall space efficiency. The processing of the U-shaped frame bottom portion 300a may form a U-shaped frame structure while simultaneously forming a step difference between the bottom portion 300a. To form such a step, press molding or NC (numerical control work) processing may be used.

The pad part 320 is located between the second part 300a2 of the bottom part 300a and the battery cell 110, and a thermally conductive resin layer 310 is located inside the pad part 320. That is, the pad portion 320 may be positioned between the thermally conductive resin layer 310 and the first portion 300a1 of the bottom portion 300a to define a position where the thermally conductive resin layer 310 is formed.

Hereinafter, a battery cell stacking method according to another embodiment of the present invention will be described with reference to FIGS. 2 to 4 again.

2 to 4, in the battery cell stacking method according to the present embodiment, the steps of stacking the first battery cells 110a on the plate 510 along the Z-axis in the vertical direction, and one side of the plate 510 And stacking the second battery cells 110b on the first battery cells 110a in the Z-axis direction with reference to the cell stack guide bar 520 positioned at. At this time, the step of stacking the second battery cells 110b is performed in a state in which the cell stack guide 520 and the other side located opposite from one side of the adjacent first battery cell 110a are supported in the X-axis direction. . Specifically, an alignment member 550 positioned adjacent to the other side of the first battery cell 110a is used to support the other side of the first battery cell 110a in the X-axis direction, and the alignment member 550 The push part 560 formed at one end may press the first battery cell 110a in the X-axis direction so that the first battery cell 110a is in close contact with the cell stack guide bar 520.

The alignment members 550 are respectively located at both ends of the first battery cell 110a along the Y-axis direction of the first battery cell 110a, and the two alignment members 550a and 550b are simultaneously connected to the first battery cell 110a. Can support.

The stacking of the second battery cells 110b according to the present exemplary embodiment includes positioning the alignment member 550 to correspond to the first battery cell 110a by moving in the Z-axis direction, and the alignment member 550 The push part 560 formed at the end of the may include pressing the first battery cell 110a along the X-axis direction. Thereafter, the level of the shift in the X-axis direction of the first battery cell 110a and the second battery cell 110b may be 0.7 mm or less.

In the above, the first battery cells 110a and the second battery cells 110b are battery cells adjacent to each other, and refer to battery cells that are sequentially stacked in the battery cell stacking process. For example, n battery cells are stacked. In this case, it is not only the first battery cells 110a and the second battery cells 110b that are stacked last shown in FIG. 3, but the battery that is stacked last from the battery cells 110 that are stacked first. It may correspond to two battery cells 110 adjacent to each other selected from among the cells 110.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

110: battery cell
120: battery cell stacked body
130: busbar frame
510: plate
520: cell stack guide bar
540: holding part
550: alignment member
560: push part

Claims (16)

A transfer member for transferring the battery cell,
A plate on which a battery cell stack formed by stacking a plurality of battery cells along a vertical Z axis is mounted,
A cell stack guide bar positioned on one side of the plate to support the same one side of the battery cells when the plurality of battery cells are stacked, and
It is located on the other side of the plate and includes an alignment member moving along the horizontal X axis and the Z axis,
The transfer member is a battery cell stacking apparatus including a holding part for moving the battery cell along the Z-axis and mounting it on the plate. In claim 1,
The alignment member pressurizes the battery cells in the X-axis direction so that the battery cells are in close contact with the cell stack guide bar. In paragraph 2,
The alignment member includes a push portion in contact with one surface of the battery cell at an end of the alignment member, and a length of the push portion in the Z-axis direction is equal to or longer than the length in the Z-axis direction of the one surface of the battery cell. Battery cell stacking device. In paragraph 3,
The position of the push unit is controlled to correspond to the first battery cell among first and second battery cells sequentially stacked on the plate. In claim 4,
The battery cell stacking apparatus having at least two alignment members formed along the Y-axis direction of the battery cells. In claim 4,
The battery cell stacking device for reciprocating motion along the X-axis by the push unit by a cylinder. In claim 1,
The holding unit is a battery cell stacking device of a vacuum adsorption method. Laminating the first battery cell on the plate along the vertical Z axis, and
And stacking a second battery cell on the first battery cell in the Z-axis direction based on a cell stack guide bar positioned at one side of the plate,
The stacking of the second battery cells may be performed in a state in which the cell stack guide bar is adjacent to the first battery cell and the other side located opposite to the first battery cell is supported in the X-axis direction. In clause 8,
Using an alignment member positioned adjacent to the other side of the first battery cell to support the other side of the first battery cell in the X-axis direction,
The alignment member is a battery cell stacking method in which the first battery cells are pressed in the X-axis direction so that the first battery cells are in close contact with the cell stack guide bar. In claim 9,
The alignment members are positioned at both ends of the first battery cell along the Y-axis direction of the first battery cell, and the two alignment members simultaneously support the first battery cell. In claim 9,
The step of stacking the second battery cells,
Positioning the alignment member to correspond to the first battery cell by moving in the Z-axis direction, and
A battery cell stacking method comprising the step of pressing the first battery cell along the X-axis direction by a push part formed at an end of the alignment member. In clause 8,
A battery cell stacking method in which the level of the shift in the X-axis direction of the first battery cell and the second battery cell is 0.7 mm or less. A battery cell stack in which a plurality of battery cells are stacked,
A U-shaped frame accommodating the battery cell stack and having an open top, and
Including an upper plate covering the battery cell stack on the open U-shaped frame,
The U-shaped frame includes a bottom portion and two side portions facing each other,
A battery module having a level of deviation of 0.7 mm or less in a horizontal direction of the battery cells included in the battery cell stack. In claim 13,
The bottom portion includes a first portion and a second portion, the first portion is located at an edge with respect to the length direction of the battery cell, the second portion is located inside the first portion, the first portion The thickness of the second part is thinner than the thickness of the Battery module. In clause 14,
Further comprising a bus bar frame connected to the battery cell stack,
The U-shaped frame is opened on both sides opposite to each other based on the protruding direction of the electrode lead of the battery cell stack, and the bus bar frame is connected to the battery cell stack on both open sides of the U-shaped frame, and ,
The bus bar frame includes a main frame disposed perpendicular to a direction in which the electrode leads protrude, and a bent portion extending from a lower portion of the main frame. In paragraph 15,
The battery cell includes a protrusion formed in a width direction, and the protrusion is located on the bent part.

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